Merge master.kernel.org:/pub/scm/linux/kernel/git/mingo/mutex-2.6

198 files changed, 2754 insertions, 649 deletions

diff --git a/Documentation/DocBook/kernel-locking.tmpl b/Documentation/DocBook/kernel-locking.tmpl
index 90dc2de8e0af..158ffe9bfade 100644
--- a/Documentation/DocBook/kernel-locking.tmpl
+++ b/Documentation/DocBook/kernel-locking.tmpl
@@ -222,7 +222,7 @@
    <title>Two Main Types of Kernel Locks: Spinlocks and Semaphores</title>
 
    <para>
-     There are two main types of kernel locks.  The fundamental type
+     There are three main types of kernel locks.  The fundamental type
      is the spinlock 
      (<filename class="headerfile">include/asm/spinlock.h</filename>),
      which is a very simple single-holder lock: if you can't get the 
@@ -230,16 +230,22 @@
      very small and fast, and can be used anywhere.
    </para>
    <para>
-     The second type is a semaphore
+     The second type is a mutex
+     (<filename class="headerfile">include/linux/mutex.h</filename>): it
+     is like a spinlock, but you may block holding a mutex.
+     If you can't lock a mutex, your task will suspend itself, and be woken
+     up when the mutex is released.  This means the CPU can do something
+     else while you are waiting.  There are many cases when you simply
+     can't sleep (see <xref linkend="sleeping-things"/>), and so have to
+     use a spinlock instead.
+   </para>
+   <para>
+     The third type is a semaphore
      (<filename class="headerfile">include/asm/semaphore.h</filename>): it
      can have more than one holder at any time (the number decided at
      initialization time), although it is most commonly used as a
-     single-holder lock (a mutex).  If you can't get a semaphore,
-     your task will put itself on the queue, and be woken up when the
-     semaphore is released.  This means the CPU will do something
-     else while you are waiting, but there are many cases when you
-     simply can't sleep (see <xref linkend="sleeping-things"/>), and so
-     have to use a spinlock instead.
+     single-holder lock (a mutex).  If you can't get a semaphore, your
+     task will be suspended and later on woken up - just like for mutexes.
    </para>
    <para>
      Neither type of lock is recursive: see
diff --git a/Documentation/mutex-design.txt b/Documentation/mutex-design.txt
new file mode 100644
index 000000000000..cbf79881a41c
--- /dev/null
+++ b/Documentation/mutex-design.txt
@@ -0,0 +1,135 @@
+Generic Mutex Subsystem
+
+started by Ingo Molnar <mingo@redhat.com>
+
+  "Why on earth do we need a new mutex subsystem, and what's wrong
+   with semaphores?"
+
+firstly, there's nothing wrong with semaphores. But if the simpler
+mutex semantics are sufficient for your code, then there are a couple
+of advantages of mutexes:
+
+ - 'struct mutex' is smaller on most architectures: .e.g on x86,
+   'struct semaphore' is 20 bytes, 'struct mutex' is 16 bytes.
+   A smaller structure size means less RAM footprint, and better
+   CPU-cache utilization.
+
+ - tighter code. On x86 i get the following .text sizes when
+   switching all mutex-alike semaphores in the kernel to the mutex
+   subsystem:
+
+        text    data     bss     dec     hex filename
+     3280380  868188  396860 4545428  455b94 vmlinux-semaphore
+     3255329  865296  396732 4517357  44eded vmlinux-mutex
+
+   that's 25051 bytes of code saved, or a 0.76% win - off the hottest
+   codepaths of the kernel. (The .data savings are 2892 bytes, or 0.33%)
+   Smaller code means better icache footprint, which is one of the
+   major optimization goals in the Linux kernel currently.
+
+ - the mutex subsystem is slightly faster and has better scalability for
+   contended workloads. On an 8-way x86 system, running a mutex-based
+   kernel and testing creat+unlink+close (of separate, per-task files)
+   in /tmp with 16 parallel tasks, the average number of ops/sec is:
+
+    Semaphores:                        Mutexes:
+
+    $ ./test-mutex V 16 10             $ ./test-mutex V 16 10
+    8 CPUs, running 16 tasks.          8 CPUs, running 16 tasks.
+    checking VFS performance.          checking VFS performance.
+    avg loops/sec:      34713          avg loops/sec:      84153
+    CPU utilization:    63%            CPU utilization:    22%
+
+   i.e. in this workload, the mutex based kernel was 2.4 times faster
+   than the semaphore based kernel, _and_ it also had 2.8 times less CPU
+   utilization. (In terms of 'ops per CPU cycle', the semaphore kernel
+   performed 551 ops/sec per 1% of CPU time used, while the mutex kernel
+   performed 3825 ops/sec per 1% of CPU time used - it was 6.9 times
+   more efficient.)
+
+   the scalability difference is visible even on a 2-way P4 HT box:
+
+    Semaphores:                        Mutexes:
+
+    $ ./test-mutex V 16 10             $ ./test-mutex V 16 10
+    4 CPUs, running 16 tasks.          8 CPUs, running 16 tasks.
+    checking VFS performance.          checking VFS performance.
+    avg loops/sec:      127659         avg loops/sec:      181082
+    CPU utilization:    100%           CPU utilization:    34%
+
+   (the straight performance advantage of mutexes is 41%, the per-cycle
+    efficiency of mutexes is 4.1 times better.)
+
+ - there are no fastpath tradeoffs, the mutex fastpath is just as tight
+   as the semaphore fastpath. On x86, the locking fastpath is 2
+   instructions:
+
+    c0377ccb <mutex_lock>:
+    c0377ccb:       f0 ff 08                lock decl (%eax)
+    c0377cce:       78 0e                   js     c0377cde <.text.lock.mutex>
+    c0377cd0:       c3                      ret
+
+   the unlocking fastpath is equally tight:
+
+    c0377cd1 <mutex_unlock>:
+    c0377cd1:       f0 ff 00                lock incl (%eax)
+    c0377cd4:       7e 0f                   jle    c0377ce5 <.text.lock.mutex+0x7>
+    c0377cd6:       c3                      ret
+
+ - 'struct mutex' semantics are well-defined and are enforced if
+   CONFIG_DEBUG_MUTEXES is turned on. Semaphores on the other hand have
+   virtually no debugging code or instrumentation. The mutex subsystem
+   checks and enforces the following rules:
+
+   * - only one task can hold the mutex at a time
+   * - only the owner can unlock the mutex
+   * - multiple unlocks are not permitted
+   * - recursive locking is not permitted
+   * - a mutex object must be initialized via the API
+   * - a mutex object must not be initialized via memset or copying
+   * - task may not exit with mutex held
+   * - memory areas where held locks reside must not be freed
+   * - held mutexes must not be reinitialized
+   * - mutexes may not be used in irq contexts
+
+   furthermore, there are also convenience features in the debugging
+   code:
+
+   * - uses symbolic names of mutexes, whenever they are printed in debug output
+   * - point-of-acquire tracking, symbolic lookup of function names
+   * - list of all locks held in the system, printout of them
+   * - owner tracking
+   * - detects self-recursing locks and prints out all relevant info
+   * - detects multi-task circular deadlocks and prints out all affected
+   *   locks and tasks (and only those tasks)
+
+Disadvantages
+-------------
+
+The stricter mutex API means you cannot use mutexes the same way you
+can use semaphores: e.g. they cannot be used from an interrupt context,
+nor can they be unlocked from a different context that which acquired
+it. [ I'm not aware of any other (e.g. performance) disadvantages from
+using mutexes at the moment, please let me know if you find any. ]
+
+Implementation of mutexes
+-------------------------
+
+'struct mutex' is the new mutex type, defined in include/linux/mutex.h
+and implemented in kernel/mutex.c. It is a counter-based mutex with a
+spinlock and a wait-list. The counter has 3 states: 1 for "unlocked",
+0 for "locked" and negative numbers (usually -1) for "locked, potential
+waiters queued".
+
+the APIs of 'struct mutex' have been streamlined:
+
+ DEFINE_MUTEX(name);
+
+ mutex_init(mutex);
+
+ void mutex_lock(struct mutex *lock);
+ int  mutex_lock_interruptible(struct mutex *lock);
+ int  mutex_trylock(struct mutex *lock);
+ void mutex_unlock(struct mutex *lock);
+ int  mutex_is_locked(struct mutex *lock);
+
diff --git a/arch/i386/mm/pageattr.c b/arch/i386/mm/pageattr.c
index c30a16df6440..e8a53552b13d 100644
--- a/arch/i386/mm/pageattr.c
+++ b/arch/i386/mm/pageattr.c
@@ -222,6 +222,10 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
 {
         if (PageHighMem(page))
                 return;
+        if (!enable)
+                mutex_debug_check_no_locks_freed(page_address(page),
+                                                 page_address(page+numpages));
+
         /* the return value is ignored - the calls cannot fail,
          * large pages are disabled at boot time.
          */
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 1f3507c75e90..d2ba358c6e38 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -137,7 +137,7 @@ spufs_delete_inode(struct inode *inode)
 static void spufs_prune_dir(struct dentry *dir)
 {
         struct dentry *dentry, *tmp;
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         list_for_each_entry_safe(dentry, tmp, &dir->d_subdirs, d_child) {
                 spin_lock(&dcache_lock);
                 spin_lock(&dentry->d_lock);
@@ -154,7 +154,7 @@ static void spufs_prune_dir(struct dentry *dir)
                 }
         }
         shrink_dcache_parent(dir);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 }
 
 static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
@@ -162,15 +162,15 @@ static int spufs_rmdir(struct inode *root, struct dentry *dir_dentry)
         struct spu_context *ctx;
 
         /* remove all entries */
-        down(&root->i_sem);
+        mutex_lock(&root->i_mutex);
         spufs_prune_dir(dir_dentry);
-        up(&root->i_sem);
+        mutex_unlock(&root->i_mutex);
 
         /* We have to give up the mm_struct */
         ctx = SPUFS_I(dir_dentry->d_inode)->i_ctx;
         spu_forget(ctx);
 
-        /* XXX Do we need to hold i_sem here ? */
+        /* XXX Do we need to hold i_mutex here ? */
         return simple_rmdir(root, dir_dentry);
 }
 
@@ -330,7 +330,7 @@ long spufs_create_thread(struct nameidata *nd,
 out_dput:
         dput(dentry);
 out_dir:
-        up(&nd->dentry->d_inode->i_sem);
+        mutex_unlock(&nd->dentry->d_inode->i_mutex);
 out:
         return ret;
 }
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index a452b13620a2..864729046e22 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -215,7 +215,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
         unsigned offset, bv_offs;
         int len, ret;
 
-        down(&mapping->host->i_sem);
+        mutex_lock(&mapping->host->i_mutex);
         index = pos >> PAGE_CACHE_SHIFT;
         offset = pos & ((pgoff_t)PAGE_CACHE_SIZE - 1);
         bv_offs = bvec->bv_offset;
@@ -278,7 +278,7 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
         }
         ret = 0;
 out:
-        up(&mapping->host->i_sem);
+        mutex_unlock(&mapping->host->i_mutex);
         return ret;
 unlock:
         unlock_page(page);
@@ -527,12 +527,12 @@ static int loop_make_request(request_queue_t *q, struct bio *old_bio)
         lo->lo_pending++;
         loop_add_bio(lo, old_bio);
         spin_unlock_irq(&lo->lo_lock);
-        up(&lo->lo_bh_mutex);
+        complete(&lo->lo_bh_done);
         return 0;
 
 out:
         if (lo->lo_pending == 0)
-                up(&lo->lo_bh_mutex);
+                complete(&lo->lo_bh_done);
         spin_unlock_irq(&lo->lo_lock);
         bio_io_error(old_bio, old_bio->bi_size);
         return 0;
@@ -593,23 +593,20 @@ static int loop_thread(void *data)
         lo->lo_pending = 1;
 
         /*
-         * up sem, we are running
+         * complete it, we are running
          */
-        up(&lo->lo_sem);
+        complete(&lo->lo_done);
 
         for (;;) {
                 int pending;
 
-                /*
-                 * interruptible just to not contribute to load avg
-                 */
-                if (down_interruptible(&lo->lo_bh_mutex))
+                if (wait_for_completion_interruptible(&lo->lo_bh_done))
                         continue;
 
                 spin_lock_irq(&lo->lo_lock);
 
                 /*
-                 * could be upped because of tear-down, not pending work
+                 * could be completed because of tear-down, not pending work
                  */
                 if (unlikely(!lo->lo_pending)) {
                         spin_unlock_irq(&lo->lo_lock);
@@ -632,7 +629,7 @@ static int loop_thread(void *data)
                         break;
         }
 
-        up(&lo->lo_sem);
+        complete(&lo->lo_done);
         return 0;
 }
 
@@ -843,7 +840,7 @@ static int loop_set_fd(struct loop_device *lo, struct file *lo_file,
         set_blocksize(bdev, lo_blocksize);
 
         kernel_thread(loop_thread, lo, CLONE_KERNEL);
-        down(&lo->lo_sem);
+        wait_for_completion(&lo->lo_done);
         return 0;
 
  out_putf:
@@ -909,10 +906,10 @@ static int loop_clr_fd(struct loop_device *lo, struct block_device *bdev)
         lo->lo_state = Lo_rundown;
         lo->lo_pending--;
         if (!lo->lo_pending)
-                up(&lo->lo_bh_mutex);
+                complete(&lo->lo_bh_done);
         spin_unlock_irq(&lo->lo_lock);
 
-        down(&lo->lo_sem);
+        wait_for_completion(&lo->lo_done);
 
         lo->lo_backing_file = NULL;
 
@@ -1289,8 +1286,8 @@ static int __init loop_init(void)
                 if (!lo->lo_queue)
                         goto out_mem4;
                 init_MUTEX(&lo->lo_ctl_mutex);
-                init_MUTEX_LOCKED(&lo->lo_sem);
-                init_MUTEX_LOCKED(&lo->lo_bh_mutex);
+                init_completion(&lo->lo_done);
+                init_completion(&lo->lo_bh_done);
                 lo->lo_number = i;
                 spin_lock_init(&lo->lo_lock);
                 disk->major = LOOP_MAJOR;
diff --git a/drivers/block/sx8.c b/drivers/block/sx8.c
index c0cdc182a8b0..4bdf95716e2b 100644
--- a/drivers/block/sx8.c
+++ b/drivers/block/sx8.c
@@ -27,8 +27,8 @@
 #include <linux/time.h>
 #include <linux/hdreg.h>
 #include <linux/dma-mapping.h>
+#include <linux/completion.h>
 #include <asm/io.h>
-#include <asm/semaphore.h>
 #include <asm/uaccess.h>
 
 #if 0
@@ -303,7 +303,7 @@ struct carm_host {
 
         struct work_struct              fsm_task;
 
-        struct semaphore                probe_sem;
+        struct completion               probe_comp;
 };
 
 struct carm_response {
@@ -1346,7 +1346,7 @@ static void carm_fsm_task (void *_data)
         }
 
         case HST_PROBE_FINISHED:
-                up(&host->probe_sem);
+                complete(&host->probe_comp);
                 break;
 
         case HST_ERROR:
@@ -1622,7 +1622,7 @@ static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         host->flags = pci_dac ? FL_DAC : 0;
         spin_lock_init(&host->lock);
         INIT_WORK(&host->fsm_task, carm_fsm_task, host);
-        init_MUTEX_LOCKED(&host->probe_sem);
+        init_completion(&host->probe_comp);
 
         for (i = 0; i < ARRAY_SIZE(host->req); i++)
                 host->req[i].tag = i;
@@ -1691,8 +1691,8 @@ static int carm_init_one (struct pci_dev *pdev, const struct pci_device_id *ent)
         if (rc)
                 goto err_out_free_irq;
 
-        DPRINTK("waiting for probe_sem\n");
-        down(&host->probe_sem);
+        DPRINTK("waiting for probe_comp\n");
+        wait_for_completion(&host->probe_comp);
 
         printk(KERN_INFO "%s: pci %s, ports %d, io %lx, irq %u, major %d\n",
                host->name, pci_name(pdev), (int) CARM_MAX_PORTS,
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 5b2d18035073..704c3c07f0ab 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -741,7 +741,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
 {
         loff_t ret;
 
-        down(&file->f_dentry->d_inode->i_sem);
+        mutex_lock(&file->f_dentry->d_inode->i_mutex);
         switch (orig) {
                 case 0:
                         file->f_pos = offset;
@@ -756,7 +756,7 @@ static loff_t memory_lseek(struct file * file, loff_t offset, int orig)
                 default:
                         ret = -EINVAL;
         }
-        up(&file->f_dentry->d_inode->i_sem);
+        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
         return ret;
 }
 
diff --git a/drivers/char/sysrq.c b/drivers/char/sysrq.c
index 145275ebdd7e..5765f672e853 100644
--- a/drivers/char/sysrq.c
+++ b/drivers/char/sysrq.c
@@ -153,6 +153,21 @@ static struct sysrq_key_op sysrq_mountro_op = {
 
 /* END SYNC SYSRQ HANDLERS BLOCK */
 
+#ifdef CONFIG_DEBUG_MUTEXES
+
+static void
+sysrq_handle_showlocks(int key, struct pt_regs *pt_regs, struct tty_struct *tty)
+{
+        mutex_debug_show_all_locks();
+}
+
+static struct sysrq_key_op sysrq_showlocks_op = {
+        .handler        = sysrq_handle_showlocks,
+        .help_msg       = "show-all-locks(D)",
+        .action_msg     = "Show Locks Held",
+};
+
+#endif
 
 /* SHOW SYSRQ HANDLERS BLOCK */
 
@@ -294,7 +309,11 @@ static struct sysrq_key_op *sysrq_key_table[SYSRQ_KEY_TABLE_LENGTH] = {
 #else
 /* c */ NULL,
 #endif
+#ifdef CONFIG_DEBUG_MUTEXES
+/* d */ &sysrq_showlocks_op,
+#else
 /* d */ NULL,
+#endif
 /* e */ &sysrq_term_op,
 /* f */ &sysrq_moom_op,
 /* g */ NULL,
diff --git a/drivers/char/watchdog/cpu5wdt.c b/drivers/char/watchdog/cpu5wdt.c
index e75045fe2641..3e8410b5a65e 100644
--- a/drivers/char/watchdog/cpu5wdt.c
+++ b/drivers/char/watchdog/cpu5wdt.c
@@ -28,6 +28,7 @@
 #include <linux/init.h>
 #include <linux/ioport.h>
 #include <linux/timer.h>
+#include <linux/completion.h>
 #include <linux/jiffies.h>
 #include <asm/io.h>
 #include <asm/uaccess.h>
@@ -57,7 +58,7 @@ static int ticks = 10000;
 /* some device data */
 
 static struct {
-        struct semaphore stop;
+        struct completion stop;
         volatile int running;
         struct timer_list timer;
         volatile int queue;
@@ -85,7 +86,7 @@ static void cpu5wdt_trigger(unsigned long unused)
         }
         else {
                 /* ticks doesn't matter anyway */
-                up(&cpu5wdt_device.stop);
+                complete(&cpu5wdt_device.stop);
         }
 
 }
@@ -239,7 +240,7 @@ static int __devinit cpu5wdt_init(void)
         if ( !val )
                 printk(KERN_INFO PFX "sorry, was my fault\n");
 
-        init_MUTEX_LOCKED(&cpu5wdt_device.stop);
+        init_completion(&cpu5wdt_device.stop);
         cpu5wdt_device.queue = 0;
 
         clear_bit(0, &cpu5wdt_device.inuse);
@@ -269,7 +270,7 @@ static void __devexit cpu5wdt_exit(void)
 {
         if ( cpu5wdt_device.queue ) {
                 cpu5wdt_device.queue = 0;
-                down(&cpu5wdt_device.stop);
+                wait_for_completion(&cpu5wdt_device.stop);
         }
 
         misc_deregister(&cpu5wdt_misc);
diff --git a/drivers/ide/ide-probe.c b/drivers/ide/ide-probe.c
index 1ddaa71a8f45..7cb2d86601db 100644
--- a/drivers/ide/ide-probe.c
+++ b/drivers/ide/ide-probe.c
@@ -655,7 +655,7 @@ static void hwif_release_dev (struct device *dev)
 {
         ide_hwif_t *hwif = container_of(dev, ide_hwif_t, gendev);
 
-        up(&hwif->gendev_rel_sem);
+        complete(&hwif->gendev_rel_comp);
 }
 
 static void hwif_register (ide_hwif_t *hwif)
@@ -1327,7 +1327,7 @@ static void drive_release_dev (struct device *dev)
         drive->queue = NULL;
         spin_unlock_irq(&ide_lock);
 
-        up(&drive->gendev_rel_sem);
+        complete(&drive->gendev_rel_comp);
 }
 
 /*
diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c
index b069b13b75a7..ec5a4cb173b0 100644
--- a/drivers/ide/ide.c
+++ b/drivers/ide/ide.c
@@ -222,7 +222,7 @@ static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
         hwif->mwdma_mask = 0x80;        /* disable all mwdma */
         hwif->swdma_mask = 0x80;        /* disable all swdma */
 
-        sema_init(&hwif->gendev_rel_sem, 0);
+        init_completion(&hwif->gendev_rel_comp);
 
         default_hwif_iops(hwif);
         default_hwif_transport(hwif);
@@ -245,7 +245,7 @@ static void init_hwif_data(ide_hwif_t *hwif, unsigned int index)
                 drive->is_flash                 = 0;
                 drive->vdma                     = 0;
                 INIT_LIST_HEAD(&drive->list);
-                sema_init(&drive->gendev_rel_sem, 0);
+                init_completion(&drive->gendev_rel_comp);
         }
 }
 
@@ -602,7 +602,7 @@ void ide_unregister(unsigned int index)
                 }
                 spin_unlock_irq(&ide_lock);
                 device_unregister(&drive->gendev);
-                down(&drive->gendev_rel_sem);
+                wait_for_completion(&drive->gendev_rel_comp);
                 spin_lock_irq(&ide_lock);
         }
         hwif->present = 0;
@@ -662,7 +662,7 @@ void ide_unregister(unsigned int index)
         /* More messed up locking ... */
         spin_unlock_irq(&ide_lock);
         device_unregister(&hwif->gendev);
-        down(&hwif->gendev_rel_sem);
+        wait_for_completion(&hwif->gendev_rel_comp);
 
         /*
          * Remove us from the kernel's knowledge
diff --git a/drivers/isdn/capi/capifs.c b/drivers/isdn/capi/capifs.c
index 207cae366256..0a37aded4b54 100644
--- a/drivers/isdn/capi/capifs.c
+++ b/drivers/isdn/capi/capifs.c
@@ -138,7 +138,7 @@ static struct dentry *get_node(int num)
 {
         char s[10];
         struct dentry *root = capifs_root;
-        down(&root->d_inode->i_sem);
+        mutex_lock(&root->d_inode->i_mutex);
         return lookup_one_len(s, root, sprintf(s, "%d", num));
 }
 
@@ -159,7 +159,7 @@ void capifs_new_ncci(unsigned int number, dev_t device)
         dentry = get_node(number);
         if (!IS_ERR(dentry) && !dentry->d_inode)
                 d_instantiate(dentry, inode);
-        up(&capifs_root->d_inode->i_sem);
+        mutex_unlock(&capifs_root->d_inode->i_mutex);
 }
 
 void capifs_free_ncci(unsigned int number)
@@ -175,7 +175,7 @@ void capifs_free_ncci(unsigned int number)
                 }
                 dput(dentry);
         }
-        up(&capifs_root->d_inode->i_sem);
+        mutex_unlock(&capifs_root->d_inode->i_mutex);
 }
 
 static int __init capifs_init(void)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0e481512f918..5c210b0a4cb0 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -837,9 +837,9 @@ static void __set_size(struct mapped_device *md, sector_t size)
 {
         set_capacity(md->disk, size);
 
-        down(&md->suspended_bdev->bd_inode->i_sem);
+        mutex_lock(&md->suspended_bdev->bd_inode->i_mutex);
         i_size_write(md->suspended_bdev->bd_inode, (loff_t)size << SECTOR_SHIFT);
-        up(&md->suspended_bdev->bd_inode->i_sem);
+        mutex_unlock(&md->suspended_bdev->bd_inode->i_mutex);
 }
 
 static int __bind(struct mapped_device *md, struct dm_table *t)
diff --git a/drivers/md/md.c b/drivers/md/md.c
index e423a16ba3c9..0302723fa21f 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -3460,9 +3460,9 @@ static int update_size(mddev_t *mddev, unsigned long size)
 
                 bdev = bdget_disk(mddev->gendisk, 0);
                 if (bdev) {
-                        down(&bdev->bd_inode->i_sem);
+                        mutex_lock(&bdev->bd_inode->i_mutex);
                         i_size_write(bdev->bd_inode, mddev->array_size << 10);
-                        up(&bdev->bd_inode->i_sem);
+                        mutex_unlock(&bdev->bd_inode->i_mutex);
                         bdput(bdev);
                 }
         }
@@ -3486,9 +3486,9 @@ static int update_raid_disks(mddev_t *mddev, int raid_disks)
 
                 bdev = bdget_disk(mddev->gendisk, 0);
                 if (bdev) {
-                        down(&bdev->bd_inode->i_sem);
+                        mutex_lock(&bdev->bd_inode->i_mutex);
                         i_size_write(bdev->bd_inode, mddev->array_size << 10);
-                        up(&bdev->bd_inode->i_sem);
+                        mutex_unlock(&bdev->bd_inode->i_mutex);
                         bdput(bdev);
                 }
         }
diff --git a/drivers/pci/proc.c b/drivers/pci/proc.c
index 9eb465727fce..9cb6dd0834be 100644
--- a/drivers/pci/proc.c
+++ b/drivers/pci/proc.c
@@ -25,7 +25,7 @@ proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
         loff_t new = -1;
         struct inode *inode = file->f_dentry->d_inode;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         switch (whence) {
         case 0:
                 new = off;
@@ -41,7 +41,7 @@ proc_bus_pci_lseek(struct file *file, loff_t off, int whence)
                 new = -EINVAL;
         else
                 file->f_pos = new;
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return new;
 }
 
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 4ddc453023a2..3cf945cc5b9a 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -184,13 +184,13 @@ static void update_bus(struct dentry *bus)
         bus->d_inode->i_gid = busgid;
         bus->d_inode->i_mode = S_IFDIR | busmode;
 
-        down(&bus->d_inode->i_sem);
+        mutex_lock(&bus->d_inode->i_mutex);
 
         list_for_each_entry(dev, &bus->d_subdirs, d_u.d_child)
                 if (dev->d_inode)
                         update_dev(dev);
 
-        up(&bus->d_inode->i_sem);
+        mutex_unlock(&bus->d_inode->i_mutex);
 }
 
 static void update_sb(struct super_block *sb)
@@ -201,7 +201,7 @@ static void update_sb(struct super_block *sb)
         if (!root)
                 return;
 
-        down(&root->d_inode->i_sem);
+        mutex_lock(&root->d_inode->i_mutex);
 
         list_for_each_entry(bus, &root->d_subdirs, d_u.d_child) {
                 if (bus->d_inode) {
@@ -219,7 +219,7 @@ static void update_sb(struct super_block *sb)
                 }
         }
 
-        up(&root->d_inode->i_sem);
+        mutex_unlock(&root->d_inode->i_mutex);
 }
 
 static int remount(struct super_block *sb, int *flags, char *data)
@@ -333,10 +333,10 @@ static int usbfs_empty (struct dentry *dentry)
 static int usbfs_unlink (struct inode *dir, struct dentry *dentry)
 {
         struct inode *inode = dentry->d_inode;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         dentry->d_inode->i_nlink--;
         dput(dentry);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         d_delete(dentry);
         return 0;
 }
@@ -346,7 +346,7 @@ static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
         int error = -ENOTEMPTY;
         struct inode * inode = dentry->d_inode;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         dentry_unhash(dentry);
         if (usbfs_empty(dentry)) {
                 dentry->d_inode->i_nlink -= 2;
@@ -355,7 +355,7 @@ static int usbfs_rmdir(struct inode *dir, struct dentry *dentry)
                 dir->i_nlink--;
                 error = 0;
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         if (!error)
                 d_delete(dentry);
         dput(dentry);
@@ -380,7 +380,7 @@ static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
 {
         loff_t retval = -EINVAL;
 
-        down(&file->f_dentry->d_inode->i_sem);
+        mutex_lock(&file->f_dentry->d_inode->i_mutex);
         switch(orig) {
         case 0:
                 if (offset > 0) {
@@ -397,7 +397,7 @@ static loff_t default_file_lseek (struct file *file, loff_t offset, int orig)
         default:
                 break;
         }
-        up(&file->f_dentry->d_inode->i_sem);
+        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
         return retval;
 }
 
@@ -480,7 +480,7 @@ static int fs_create_by_name (const char *name, mode_t mode,
         }
 
         *dentry = NULL;
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         *dentry = lookup_one_len(name, parent, strlen(name));
         if (!IS_ERR(dentry)) {
                 if ((mode & S_IFMT) == S_IFDIR)
@@ -489,7 +489,7 @@ static int fs_create_by_name (const char *name, mode_t mode,
                         error = usbfs_create (parent->d_inode, *dentry, mode);
         } else
                 error = PTR_ERR(dentry);
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
 
         return error;
 }
@@ -528,7 +528,7 @@ static void fs_remove_file (struct dentry *dentry)
         if (!parent || !parent->d_inode)
                 return;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         if (usbfs_positive(dentry)) {
                 if (dentry->d_inode) {
                         if (S_ISDIR(dentry->d_inode->i_mode))
@@ -538,7 +538,7 @@ static void fs_remove_file (struct dentry *dentry)
                 dput(dentry);
                 }
         }
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
 }
 
 /* --------------------------------------------------------------------- */
diff --git a/drivers/usb/gadget/file_storage.c b/drivers/usb/gadget/file_storage.c
index 0cea9782d7d4..de59c58896d6 100644
--- a/drivers/usb/gadget/file_storage.c
+++ b/drivers/usb/gadget/file_storage.c
@@ -1891,7 +1891,7 @@ static int fsync_sub(struct lun *curlun)
                 return -EINVAL;
 
         inode = filp->f_dentry->d_inode;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         current->flags |= PF_SYNCWRITE;
         rc = filemap_fdatawrite(inode->i_mapping);
         err = filp->f_op->fsync(filp, filp->f_dentry, 1);
@@ -1901,7 +1901,7 @@ static int fsync_sub(struct lun *curlun)
         if (!rc)
                 rc = err;
         current->flags &= ~PF_SYNCWRITE;
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         VLDBG(curlun, "fdatasync -> %d\n", rc);
         return rc;
 }
diff --git a/drivers/usb/gadget/inode.c b/drivers/usb/gadget/inode.c
index 5c40980a5bd9..c6c279de832e 100644
--- a/drivers/usb/gadget/inode.c
+++ b/drivers/usb/gadget/inode.c
@@ -1562,10 +1562,10 @@ restart:
                 spin_unlock_irq (&dev->lock);
 
                 /* break link to dcache */
-                down (&parent->i_sem);
+                mutex_lock (&parent->i_mutex);
                 d_delete (dentry);
                 dput (dentry);
-                up (&parent->i_sem);
+                mutex_unlock (&parent->i_mutex);
 
                 /* fds may still be open */
                 goto restart;
diff --git a/fs/affs/inode.c b/fs/affs/inode.c
index 9ebe881c6786..44d439cb69f4 100644
--- a/fs/affs/inode.c
+++ b/fs/affs/inode.c
@@ -244,10 +244,10 @@ affs_put_inode(struct inode *inode)
         pr_debug("AFFS: put_inode(ino=%lu, nlink=%u)\n", inode->i_ino, inode->i_nlink);
         affs_free_prealloc(inode);
         if (atomic_read(&inode->i_count) == 1) {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 if (inode->i_size != AFFS_I(inode)->mmu_private)
                         affs_truncate(inode);
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
 }
 
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index a1ab1c0ed215..808134a5a2fa 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -229,9 +229,9 @@ static struct dentry *autofs_root_lookup(struct inode *dir, struct dentry *dentr
         dentry->d_flags |= DCACHE_AUTOFS_PENDING;
         d_add(dentry, NULL);
 
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         autofs_revalidate(dentry, nd);
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
 
         /*
          * If we are still pending, check if we had to handle
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 2241405ffc41..541b19e6fec9 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -489,9 +489,9 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
         d_add(dentry, NULL);
 
         if (dentry->d_op && dentry->d_op->d_revalidate) {
-                up(&dir->i_sem);
+                mutex_unlock(&dir->i_mutex);
                 (dentry->d_op->d_revalidate)(dentry, nd);
-                down(&dir->i_sem);
+                mutex_lock(&dir->i_mutex);
         }
 
         /*
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 2568eb41cb3a..9ccc7d8275b8 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -588,11 +588,11 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
                 case 2: set_bit(Enabled, &e->flags);
                         break;
                 case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
-                        down(&root->d_inode->i_sem);
+                        mutex_lock(&root->d_inode->i_mutex);
 
                         kill_node(e);
 
-                        up(&root->d_inode->i_sem);
+                        mutex_unlock(&root->d_inode->i_mutex);
                         dput(root);
                         break;
                 default: return res;
@@ -622,7 +622,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer,
                 return PTR_ERR(e);
 
         root = dget(sb->s_root);
-        down(&root->d_inode->i_sem);
+        mutex_lock(&root->d_inode->i_mutex);
         dentry = lookup_one_len(e->name, root, strlen(e->name));
         err = PTR_ERR(dentry);
         if (IS_ERR(dentry))
@@ -658,7 +658,7 @@ static ssize_t bm_register_write(struct file *file, const char __user *buffer,
 out2:
         dput(dentry);
 out:
-        up(&root->d_inode->i_sem);
+        mutex_unlock(&root->d_inode->i_mutex);
         dput(root);
 
         if (err) {
@@ -703,12 +703,12 @@ static ssize_t bm_status_write(struct file * file, const char __user * buffer,
                 case 1: enabled = 0; break;
                 case 2: enabled = 1; break;
                 case 3: root = dget(file->f_vfsmnt->mnt_sb->s_root);
-                        down(&root->d_inode->i_sem);
+                        mutex_lock(&root->d_inode->i_mutex);
 
                         while (!list_empty(&entries))
                                 kill_node(list_entry(entries.next, Node, list));
 
-                        up(&root->d_inode->i_sem);
+                        mutex_unlock(&root->d_inode->i_mutex);
                         dput(root);
                 default: return res;
         }
diff --git a/fs/block_dev.c b/fs/block_dev.c
index e0df94c37b7e..6e50346fb1ee 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -202,7 +202,7 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
         loff_t size;
         loff_t retval;
 
-        down(&bd_inode->i_sem);
+        mutex_lock(&bd_inode->i_mutex);
         size = i_size_read(bd_inode);
 
         switch (origin) {
@@ -219,7 +219,7 @@ static loff_t block_llseek(struct file *file, loff_t offset, int origin)
                 }
                 retval = offset;
         }
-        up(&bd_inode->i_sem);
+        mutex_unlock(&bd_inode->i_mutex);
         return retval;
 }
         
diff --git a/fs/buffer.c b/fs/buffer.c
index 55f0975a9b15..6466bc8a3dc7 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -352,11 +352,11 @@ static long do_fsync(unsigned int fd, int datasync)
          * We need to protect against concurrent writers,
          * which could cause livelocks in fsync_buffers_list
          */
-        down(&mapping->host->i_sem);
+        mutex_lock(&mapping->host->i_mutex);
         err = file->f_op->fsync(file, file->f_dentry, datasync);
         if (!ret)
                 ret = err;
-        up(&mapping->host->i_sem);
+        mutex_unlock(&mapping->host->i_mutex);
         err = filemap_fdatawait(mapping);
         if (!ret)
                 ret = err;
@@ -2338,7 +2338,7 @@ int generic_commit_write(struct file *file, struct page *page,
         __block_commit_write(inode,page,from,to);
         /*
          * No need to use i_size_read() here, the i_size
-         * cannot change under us because we hold i_sem.
+         * cannot change under us because we hold i_mutex.
          */
         if (pos > inode->i_size) {
                 i_size_write(inode, pos);
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 2a13a2bac8f1..e10213b7541e 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -860,9 +860,9 @@ static int cifs_oplock_thread(void * dummyarg)
                                 DeleteOplockQEntry(oplock_item);
                                 /* can not grab inode sem here since it would
                                 deadlock when oplock received on delete 
-                                since vfs_unlink holds the i_sem across
+                                since vfs_unlink holds the i_mutex across
                                 the call */
-                                /* down(&inode->i_sem);*/
+                                /* mutex_lock(&inode->i_mutex);*/
                                 if (S_ISREG(inode->i_mode)) {
                                         rc = filemap_fdatawrite(inode->i_mapping);
                                         if(CIFS_I(inode)->clientCanCacheRead == 0) {
@@ -871,7 +871,7 @@ static int cifs_oplock_thread(void * dummyarg)
                                         }
                                 } else
                                         rc = 0;
-                                /* up(&inode->i_sem);*/
+                                /* mutex_unlock(&inode->i_mutex);*/
                                 if (rc)
                                         CIFS_I(inode)->write_behind_rc = rc;
                                 cFYI(1,("Oplock flush inode %p rc %d",inode,rc));
diff --git a/fs/cifs/inode.c b/fs/cifs/inode.c
index 9558f51bca55..3ebce9430f4a 100644
--- a/fs/cifs/inode.c
+++ b/fs/cifs/inode.c
@@ -1040,9 +1040,9 @@ int cifs_revalidate(struct dentry *direntry)
         }
 
         /* can not grab this sem since kernel filesys locking documentation
-           indicates i_sem may be taken by the kernel on lookup and rename
-           which could deadlock if we grab the i_sem here as well */
-/*      down(&direntry->d_inode->i_sem);*/
+           indicates i_mutex may be taken by the kernel on lookup and rename
+           which could deadlock if we grab the i_mutex here as well */
+/*      mutex_lock(&direntry->d_inode->i_mutex);*/
         /* need to write out dirty pages here  */
         if (direntry->d_inode->i_mapping) {
                 /* do we need to lock inode until after invalidate completes
@@ -1066,7 +1066,7 @@ int cifs_revalidate(struct dentry *direntry)
                         }
                 }
         }
-/*      up(&direntry->d_inode->i_sem); */
+/*      mutex_unlock(&direntry->d_inode->i_mutex); */
         
         kfree(full_path);
         FreeXid(xid);
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 2391766e9c7c..8f1a517f8b4e 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -453,7 +453,7 @@ int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
         coda_vfs_stat.readdir++;
 
         host_inode = host_file->f_dentry->d_inode;
-        down(&host_inode->i_sem);
+        mutex_lock(&host_inode->i_mutex);
         host_file->f_pos = coda_file->f_pos;
 
         if (!host_file->f_op->readdir) {
@@ -475,7 +475,7 @@ int coda_readdir(struct file *coda_file, void *dirent, filldir_t filldir)
         }
 out:
         coda_file->f_pos = host_file->f_pos;
-        up(&host_inode->i_sem);
+        mutex_unlock(&host_inode->i_mutex);
 
         return ret;
 }
diff --git a/fs/coda/file.c b/fs/coda/file.c
index e6bc022568f3..30b4630bd735 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -77,14 +77,14 @@ coda_file_write(struct file *coda_file, const char __user *buf, size_t count, lo
                 return -EINVAL;
 
         host_inode = host_file->f_dentry->d_inode;
-        down(&coda_inode->i_sem);
+        mutex_lock(&coda_inode->i_mutex);
 
         ret = host_file->f_op->write(host_file, buf, count, ppos);
 
         coda_inode->i_size = host_inode->i_size;
         coda_inode->i_blocks = (coda_inode->i_size + 511) >> 9;
         coda_inode->i_mtime = coda_inode->i_ctime = CURRENT_TIME_SEC;
-        up(&coda_inode->i_sem);
+        mutex_unlock(&coda_inode->i_mutex);
 
         return ret;
 }
@@ -272,9 +272,9 @@ int coda_fsync(struct file *coda_file, struct dentry *coda_dentry, int datasync)
         if (host_file->f_op && host_file->f_op->fsync) {
                 host_dentry = host_file->f_dentry;
                 host_inode = host_dentry->d_inode;
-                down(&host_inode->i_sem);
+                mutex_lock(&host_inode->i_mutex);
                 err = host_file->f_op->fsync(host_file, host_dentry, datasync);
-                up(&host_inode->i_sem);
+                mutex_unlock(&host_inode->i_mutex);
         }
 
         if ( !err && !datasync ) {
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index e48b539243a1..b668ec61527e 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -288,10 +288,10 @@ static struct dentry * configfs_lookup(struct inode *dir,
 
 /*
  * Only subdirectories count here.  Files (CONFIGFS_NOT_PINNED) are
- * attributes and are removed by rmdir().  We recurse, taking i_sem
+ * attributes and are removed by rmdir().  We recurse, taking i_mutex
  * on all children that are candidates for default detach.  If the
  * result is clean, then configfs_detach_group() will handle dropping
- * i_sem.  If there is an error, the caller will clean up the i_sem
+ * i_mutex.  If there is an error, the caller will clean up the i_mutex
  * holders via configfs_detach_rollback().
  */
 static int configfs_detach_prep(struct dentry *dentry)
@@ -309,8 +309,8 @@ static int configfs_detach_prep(struct dentry *dentry)
                 if (sd->s_type & CONFIGFS_NOT_PINNED)
                         continue;
                 if (sd->s_type & CONFIGFS_USET_DEFAULT) {
-                        down(&sd->s_dentry->d_inode->i_sem);
-                        /* Mark that we've taken i_sem */
+                        mutex_lock(&sd->s_dentry->d_inode->i_mutex);
+                        /* Mark that we've taken i_mutex */
                         sd->s_type |= CONFIGFS_USET_DROPPING;
 
                         ret = configfs_detach_prep(sd->s_dentry);
@@ -327,7 +327,7 @@ out:
 }
 
 /*
- * Walk the tree, dropping i_sem wherever CONFIGFS_USET_DROPPING is
+ * Walk the tree, dropping i_mutex wherever CONFIGFS_USET_DROPPING is
  * set.
  */
 static void configfs_detach_rollback(struct dentry *dentry)
@@ -341,7 +341,7 @@ static void configfs_detach_rollback(struct dentry *dentry)
 
                         if (sd->s_type & CONFIGFS_USET_DROPPING) {
                                 sd->s_type &= ~CONFIGFS_USET_DROPPING;
-                                up(&sd->s_dentry->d_inode->i_sem);
+                                mutex_unlock(&sd->s_dentry->d_inode->i_mutex);
                         }
                 }
         }
@@ -424,11 +424,11 @@ static void detach_groups(struct config_group *group)
 
                 /*
                  * From rmdir/unregister, a configfs_detach_prep() pass
-                 * has taken our i_sem for us.  Drop it.
+                 * has taken our i_mutex for us.  Drop it.
                  * From mkdir/register cleanup, there is no sem held.
                  */
                 if (sd->s_type & CONFIGFS_USET_DROPPING)
-                        up(&child->d_inode->i_sem);
+                        mutex_unlock(&child->d_inode->i_mutex);
 
                 d_delete(child);
                 dput(child);
@@ -493,11 +493,11 @@ static int populate_groups(struct config_group *group)
                 /* FYI, we're faking mkdir here
                  * I'm not sure we need this semaphore, as we're called
                  * from our parent's mkdir.  That holds our parent's
-                 * i_sem, so afaik lookup cannot continue through our
+                 * i_mutex, so afaik lookup cannot continue through our
                  * parent to find us, let alone mess with our tree.
-                 * That said, taking our i_sem is closer to mkdir
+                 * That said, taking our i_mutex is closer to mkdir
                  * emulation, and shouldn't hurt. */
-                down(&dentry->d_inode->i_sem);
+                mutex_lock(&dentry->d_inode->i_mutex);
 
                 for (i = 0; group->default_groups[i]; i++) {
                         new_group = group->default_groups[i];
@@ -507,7 +507,7 @@ static int populate_groups(struct config_group *group)
                                 break;
                 }
 
-                up(&dentry->d_inode->i_sem);
+                mutex_unlock(&dentry->d_inode->i_mutex);
         }
 
         if (ret)
@@ -856,7 +856,7 @@ int configfs_rename_dir(struct config_item * item, const char *new_name)
         down_write(&configfs_rename_sem);
         parent = item->parent->dentry;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
 
         new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
         if (!IS_ERR(new_dentry)) {
@@ -872,7 +872,7 @@ int configfs_rename_dir(struct config_item * item, const char *new_name)
                         error = -EEXIST;
                 dput(new_dentry);
         }
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         up_write(&configfs_rename_sem);
 
         return error;
@@ -884,9 +884,9 @@ static int configfs_dir_open(struct inode *inode, struct file *file)
         struct dentry * dentry = file->f_dentry;
         struct configfs_dirent * parent_sd = dentry->d_fsdata;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         file->private_data = configfs_new_dirent(parent_sd, NULL);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         return file->private_data ? 0 : -ENOMEM;
 
@@ -897,9 +897,9 @@ static int configfs_dir_close(struct inode *inode, struct file *file)
         struct dentry * dentry = file->f_dentry;
         struct configfs_dirent * cursor = file->private_data;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         list_del_init(&cursor->s_sibling);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         release_configfs_dirent(cursor);
 
@@ -975,7 +975,7 @@ static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin)
 {
         struct dentry * dentry = file->f_dentry;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         switch (origin) {
                 case 1:
                         offset += file->f_pos;
@@ -983,7 +983,7 @@ static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin)
                         if (offset >= 0)
                                 break;
                 default:
-                        up(&file->f_dentry->d_inode->i_sem);
+                        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
                         return -EINVAL;
         }
         if (offset != file->f_pos) {
@@ -1007,7 +1007,7 @@ static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin)
                         list_add_tail(&cursor->s_sibling, p);
                 }
         }
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         return offset;
 }
 
@@ -1037,7 +1037,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
         sd = configfs_sb->s_root->d_fsdata;
         link_group(to_config_group(sd->s_element), group);
 
-        down(&configfs_sb->s_root->d_inode->i_sem);
+        mutex_lock(&configfs_sb->s_root->d_inode->i_mutex);
 
         name.name = group->cg_item.ci_name;
         name.len = strlen(name.name);
@@ -1057,7 +1057,7 @@ int configfs_register_subsystem(struct configfs_subsystem *subsys)
         else
                 d_delete(dentry);
 
-        up(&configfs_sb->s_root->d_inode->i_sem);
+        mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex);
 
         if (dentry) {
             dput(dentry);
@@ -1079,18 +1079,18 @@ void configfs_unregister_subsystem(struct configfs_subsystem *subsys)
                 return;
         }
 
-        down(&configfs_sb->s_root->d_inode->i_sem);
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&configfs_sb->s_root->d_inode->i_mutex);
+        mutex_lock(&dentry->d_inode->i_mutex);
         if (configfs_detach_prep(dentry)) {
                 printk(KERN_ERR "configfs: Tried to unregister non-empty subsystem!\n");
         }
         configfs_detach_group(&group->cg_item);
         dentry->d_inode->i_flags |= S_DEAD;
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         d_delete(dentry);
 
-        up(&configfs_sb->s_root->d_inode->i_sem);
+        mutex_unlock(&configfs_sb->s_root->d_inode->i_mutex);
 
         dput(dentry);
 
diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index af1ffc9a15c0..c26cd61f13af 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -336,9 +336,9 @@ int configfs_add_file(struct dentry * dir, const struct configfs_attribute * att
         umode_t mode = (attr->ca_mode & S_IALLUGO) | S_IFREG;
         int error = 0;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         error = configfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         return error;
 }
diff --git a/fs/configfs/inode.c b/fs/configfs/inode.c
index 6b274c6d428f..6577c588de9d 100644
--- a/fs/configfs/inode.c
+++ b/fs/configfs/inode.c
@@ -122,7 +122,7 @@ const unsigned char * configfs_get_name(struct configfs_dirent *sd)
 
 /*
  * Unhashes the dentry corresponding to given configfs_dirent
- * Called with parent inode's i_sem held.
+ * Called with parent inode's i_mutex held.
  */
 void configfs_drop_dentry(struct configfs_dirent * sd, struct dentry * parent)
 {
@@ -145,7 +145,7 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
         struct configfs_dirent * sd;
         struct configfs_dirent * parent_sd = dir->d_fsdata;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
                 if (!sd->s_element)
                         continue;
@@ -156,7 +156,7 @@ void configfs_hash_and_remove(struct dentry * dir, const char * name)
                         break;
                 }
         }
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 }
 
 
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index a86ac4aeaedb..d4f1a2cddd47 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -146,7 +146,7 @@ static int debugfs_create_by_name(const char *name, mode_t mode,
         }
 
         *dentry = NULL;
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         *dentry = lookup_one_len(name, parent, strlen(name));
         if (!IS_ERR(dentry)) {
                 if ((mode & S_IFMT) == S_IFDIR)
@@ -155,7 +155,7 @@ static int debugfs_create_by_name(const char *name, mode_t mode,
                         error = debugfs_create(parent->d_inode, *dentry, mode);
         } else
                 error = PTR_ERR(dentry);
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
 
         return error;
 }
@@ -273,7 +273,7 @@ void debugfs_remove(struct dentry *dentry)
         if (!parent || !parent->d_inode)
                 return;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         if (debugfs_positive(dentry)) {
                 if (dentry->d_inode) {
                         if (S_ISDIR(dentry->d_inode->i_mode))
@@ -283,7 +283,7 @@ void debugfs_remove(struct dentry *dentry)
                 dput(dentry);
                 }
         }
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         simple_release_fs(&debugfs_mount, &debugfs_mount_count);
 }
 EXPORT_SYMBOL_GPL(debugfs_remove);
diff --git a/fs/devfs/base.c b/fs/devfs/base.c
index 1274422a5384..b621521e09d4 100644
--- a/fs/devfs/base.c
+++ b/fs/devfs/base.c
@@ -2162,27 +2162,27 @@ static int devfs_d_revalidate_wait(struct dentry *dentry, struct nameidata *nd)
          *
          * make sure that
          *   d_instantiate always runs under lock
-         *   we release i_sem lock before going to sleep
+         *   we release i_mutex lock before going to sleep
          *
          * unfortunately sometimes d_revalidate is called with
-         * and sometimes without i_sem lock held. The following checks
+         * and sometimes without i_mutex lock held. The following checks
          * attempt to deduce when we need to add (and drop resp.) lock
          * here. This relies on current (2.6.2) calling coventions:
          *
-         *   lookup_hash is always run under i_sem and is passing NULL
+         *   lookup_hash is always run under i_mutex and is passing NULL
          *   as nd
          *
-         *   open(...,O_CREATE,...) calls _lookup_hash under i_sem
+         *   open(...,O_CREATE,...) calls _lookup_hash under i_mutex
          *   and sets flags to LOOKUP_OPEN|LOOKUP_CREATE
          *
          *   all other invocations of ->d_revalidate seem to happen
-         *   outside of i_sem
+         *   outside of i_mutex
          */
         need_lock = nd &&
             (!(nd->flags & LOOKUP_CREATE) || (nd->flags & LOOKUP_PARENT));
 
         if (need_lock)
-                down(&dir->i_sem);
+                mutex_lock(&dir->i_mutex);
 
         if (is_devfsd_or_child(fs_info)) {
                 devfs_handle_t de = lookup_info->de;
@@ -2221,9 +2221,9 @@ static int devfs_d_revalidate_wait(struct dentry *dentry, struct nameidata *nd)
                 add_wait_queue(&lookup_info->wait_queue, &wait);
                 read_unlock(&parent->u.dir.lock);
                 /* at this point it is always (hopefully) locked */
-                up(&dir->i_sem);
+                mutex_unlock(&dir->i_mutex);
                 schedule();
-                down(&dir->i_sem);
+                mutex_lock(&dir->i_mutex);
                 /*
                  * This does not need nor should remove wait from wait_queue.
                  * Wait queue head is never reused - nothing is ever added to it
@@ -2238,7 +2238,7 @@ static int devfs_d_revalidate_wait(struct dentry *dentry, struct nameidata *nd)
 
       out:
         if (need_lock)
-                up(&dir->i_sem);
+                mutex_unlock(&dir->i_mutex);
         return 1;
 }                               /*  End Function devfs_d_revalidate_wait  */
 
@@ -2284,9 +2284,9 @@ static struct dentry *devfs_lookup(struct inode *dir, struct dentry *dentry,
         /*  Unlock directory semaphore, which will release any waiters. They
            will get the hashed dentry, and may be forced to wait for
            revalidation  */
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         wait_for_devfsd_finished(fs_info);      /*  If I'm not devfsd, must wait  */
-        down(&dir->i_sem);      /*  Grab it again because them's the rules  */
+        mutex_lock(&dir->i_mutex);      /*  Grab it again because them's the rules  */
         de = lookup_info.de;
         /*  If someone else has been so kind as to make the inode, we go home
            early  */
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index f2be44d4491f..bfb8a230bac9 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -130,7 +130,7 @@ static struct dentry *get_node(int num)
 {
         char s[12];
         struct dentry *root = devpts_root;
-        down(&root->d_inode->i_sem);
+        mutex_lock(&root->d_inode->i_mutex);
         return lookup_one_len(s, root, sprintf(s, "%d", num));
 }
 
@@ -161,7 +161,7 @@ int devpts_pty_new(struct tty_struct *tty)
         if (!IS_ERR(dentry) && !dentry->d_inode)
                 d_instantiate(dentry, inode);
 
-        up(&devpts_root->d_inode->i_sem);
+        mutex_unlock(&devpts_root->d_inode->i_mutex);
 
         return 0;
 }
@@ -178,7 +178,7 @@ struct tty_struct *devpts_get_tty(int number)
                 dput(dentry);
         }
 
-        up(&devpts_root->d_inode->i_sem);
+        mutex_unlock(&devpts_root->d_inode->i_mutex);
 
         return tty;
 }
@@ -196,7 +196,7 @@ void devpts_pty_kill(int number)
                 }
                 dput(dentry);
         }
-        up(&devpts_root->d_inode->i_sem);
+        mutex_unlock(&devpts_root->d_inode->i_mutex);
 }
 
 static int __init init_devpts_fs(void)
diff --git a/fs/direct-io.c b/fs/direct-io.c
index 3931e7f1e6bf..30dbbd1df511 100644
--- a/fs/direct-io.c
+++ b/fs/direct-io.c
@@ -56,7 +56,7 @@
  * lock_type is DIO_LOCKING for regular files on direct-IO-naive filesystems.
  * This determines whether we need to do the fancy locking which prevents
  * direct-IO from being able to read uninitialised disk blocks.  If its zero
- * (blockdev) this locking is not done, and if it is DIO_OWN_LOCKING i_sem is
+ * (blockdev) this locking is not done, and if it is DIO_OWN_LOCKING i_mutex is
  * not held for the entire direct write (taken briefly, initially, during a
  * direct read though, but its never held for the duration of a direct-IO).
  */
@@ -930,7 +930,7 @@ out:
 }
 
 /*
- * Releases both i_sem and i_alloc_sem
+ * Releases both i_mutex and i_alloc_sem
  */
 static ssize_t
 direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode, 
@@ -1062,11 +1062,11 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
 
         /*
          * All block lookups have been performed. For READ requests
-         * we can let i_sem go now that its achieved its purpose
+         * we can let i_mutex go now that its achieved its purpose
          * of protecting us from looking up uninitialized blocks.
          */
         if ((rw == READ) && (dio->lock_type == DIO_LOCKING))
-                up(&dio->inode->i_sem);
+                mutex_unlock(&dio->inode->i_mutex);
 
         /*
          * OK, all BIOs are submitted, so we can decrement bio_count to truly
@@ -1145,18 +1145,18 @@ direct_io_worker(int rw, struct kiocb *iocb, struct inode *inode,
  * The locking rules are governed by the dio_lock_type parameter.
  *
  * DIO_NO_LOCKING (no locking, for raw block device access)
- * For writes, i_sem is not held on entry; it is never taken.
+ * For writes, i_mutex is not held on entry; it is never taken.
  *
  * DIO_LOCKING (simple locking for regular files)
- * For writes we are called under i_sem and return with i_sem held, even though
+ * For writes we are called under i_mutex and return with i_mutex held, even though
  * it is internally dropped.
- * For reads, i_sem is not held on entry, but it is taken and dropped before
+ * For reads, i_mutex is not held on entry, but it is taken and dropped before
  * returning.
  *
  * DIO_OWN_LOCKING (filesystem provides synchronisation and handling of
  *      uninitialised data, allowing parallel direct readers and writers)
- * For writes we are called without i_sem, return without it, never touch it.
- * For reads, i_sem is held on entry and will be released before returning.
+ * For writes we are called without i_mutex, return without it, never touch it.
+ * For reads, i_mutex is held on entry and will be released before returning.
  *
  * Additional i_alloc_sem locking requirements described inline below.
  */
@@ -1214,11 +1214,11 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
          * For block device access DIO_NO_LOCKING is used,
          *      neither readers nor writers do any locking at all
          * For regular files using DIO_LOCKING,
-         *      readers need to grab i_sem and i_alloc_sem
-         *      writers need to grab i_alloc_sem only (i_sem is already held)
+         *      readers need to grab i_mutex and i_alloc_sem
+         *      writers need to grab i_alloc_sem only (i_mutex is already held)
          * For regular files using DIO_OWN_LOCKING,
          *      neither readers nor writers take any locks here
-         *      (i_sem is already held and release for writers here)
+         *      (i_mutex is already held and release for writers here)
          */
         dio->lock_type = dio_lock_type;
         if (dio_lock_type != DIO_NO_LOCKING) {
@@ -1228,7 +1228,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
 
                         mapping = iocb->ki_filp->f_mapping;
                         if (dio_lock_type != DIO_OWN_LOCKING) {
-                                down(&inode->i_sem);
+                                mutex_lock(&inode->i_mutex);
                                 reader_with_isem = 1;
                         }
 
@@ -1240,7 +1240,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
                         }
 
                         if (dio_lock_type == DIO_OWN_LOCKING) {
-                                up(&inode->i_sem);
+                                mutex_unlock(&inode->i_mutex);
                                 reader_with_isem = 0;
                         }
                 }
@@ -1266,7 +1266,7 @@ __blockdev_direct_IO(int rw, struct kiocb *iocb, struct inode *inode,
 
 out:
         if (reader_with_isem)
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         if (rw & WRITE)
                 current->flags &= ~PF_SYNCWRITE;
         return retval;
diff --git a/fs/dquot.c b/fs/dquot.c
index 2a62b3dc20ec..cb6d5bfbdfd5 100644
--- a/fs/dquot.c
+++ b/fs/dquot.c
@@ -100,7 +100,7 @@
  * operation is just reading pointers from inode (or not using them at all) the
  * read lock is enough. If pointers are altered function must hold write lock
  * (these locking rules also apply for S_NOQUOTA flag in the inode - note that
- * for altering the flag i_sem is also needed).  If operation is holding
+ * for altering the flag i_mutex is also needed).  If operation is holding
  * reference to dquot in other way (e.g. quotactl ops) it must be guarded by
  * dqonoff_sem.
  * This locking assures that:
@@ -117,9 +117,9 @@
  * spinlock to internal buffers before writing.
  *
  * Lock ordering (including related VFS locks) is the following:
- *   i_sem > dqonoff_sem > iprune_sem > journal_lock > dqptr_sem >
+ *   i_mutex > dqonoff_sem > iprune_sem > journal_lock > dqptr_sem >
  *   > dquot->dq_lock > dqio_sem
- * i_sem on quota files is special (it's below dqio_sem)
+ * i_mutex on quota files is special (it's below dqio_sem)
  */
 
 static DEFINE_SPINLOCK(dq_list_lock);
@@ -1369,11 +1369,11 @@ int vfs_quota_off(struct super_block *sb, int type)
                         /* If quota was reenabled in the meantime, we have
                          * nothing to do */
                         if (!sb_has_quota_enabled(sb, cnt)) {
-                                down(&toputinode[cnt]->i_sem);
+                                mutex_lock(&toputinode[cnt]->i_mutex);
                                 toputinode[cnt]->i_flags &= ~(S_IMMUTABLE |
                                   S_NOATIME | S_NOQUOTA);
                                 truncate_inode_pages(&toputinode[cnt]->i_data, 0);
-                                up(&toputinode[cnt]->i_sem);
+                                mutex_unlock(&toputinode[cnt]->i_mutex);
                                 mark_inode_dirty(toputinode[cnt]);
                                 iput(toputinode[cnt]);
                         }
@@ -1417,7 +1417,7 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
         write_inode_now(inode, 1);
         /* And now flush the block cache so that kernel sees the changes */
         invalidate_bdev(sb->s_bdev, 0);
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         down(&dqopt->dqonoff_sem);
         if (sb_has_quota_enabled(sb, type)) {
                 error = -EBUSY;
@@ -1449,7 +1449,7 @@ static int vfs_quota_on_inode(struct inode *inode, int type, int format_id)
                 goto out_file_init;
         }
         up(&dqopt->dqio_sem);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         set_enable_flags(dqopt, type);
 
         add_dquot_ref(sb, type);
@@ -1470,7 +1470,7 @@ out_lock:
                 inode->i_flags |= oldflags;
                 up_write(&dqopt->dqptr_sem);
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 out_fmt:
         put_quota_format(fmt);
 
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index c49d6254379a..5bfe40085fbc 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -177,9 +177,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
                         struct dentry *ppd;
                         struct dentry *npd;
 
-                        down(&pd->d_inode->i_sem);
+                        mutex_lock(&pd->d_inode->i_mutex);
                         ppd = CALL(nops,get_parent)(pd);
-                        up(&pd->d_inode->i_sem);
+                        mutex_unlock(&pd->d_inode->i_mutex);
 
                         if (IS_ERR(ppd)) {
                                 err = PTR_ERR(ppd);
@@ -201,9 +201,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
                                 break;
                         }
                         dprintk("find_exported_dentry: found name: %s\n", nbuf);
-                        down(&ppd->d_inode->i_sem);
+                        mutex_lock(&ppd->d_inode->i_mutex);
                         npd = lookup_one_len(nbuf, ppd, strlen(nbuf));
-                        up(&ppd->d_inode->i_sem);
+                        mutex_unlock(&ppd->d_inode->i_mutex);
                         if (IS_ERR(npd)) {
                                 err = PTR_ERR(npd);
                                 dprintk("find_exported_dentry: lookup failed: %d\n", err);
@@ -242,9 +242,9 @@ find_exported_dentry(struct super_block *sb, void *obj, void *parent,
                 struct dentry *nresult;
                 err = CALL(nops,get_name)(target_dir, nbuf, result);
                 if (!err) {
-                        down(&target_dir->d_inode->i_sem);
+                        mutex_lock(&target_dir->d_inode->i_mutex);
                         nresult = lookup_one_len(nbuf, target_dir, strlen(nbuf));
-                        up(&target_dir->d_inode->i_sem);
+                        mutex_unlock(&target_dir->d_inode->i_mutex);
                         if (!IS_ERR(nresult)) {
                                 if (nresult->d_inode) {
                                         dput(result);
diff --git a/fs/ext2/acl.c b/fs/ext2/acl.c
index 6af2f4130290..239133d01d91 100644
--- a/fs/ext2/acl.c
+++ b/fs/ext2/acl.c
@@ -149,7 +149,7 @@ ext2_iset_acl(struct inode *inode, struct posix_acl **i_acl,
 }
 
 /*
- * inode->i_sem: don't care
+ * inode->i_mutex: don't care
  */
 static struct posix_acl *
 ext2_get_acl(struct inode *inode, int type)
@@ -211,7 +211,7 @@ ext2_get_acl(struct inode *inode, int type)
 }
 
 /*
- * inode->i_sem: down
+ * inode->i_mutex: down
  */
 static int
 ext2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
@@ -301,8 +301,8 @@ ext2_permission(struct inode *inode, int mask, struct nameidata *nd)
 /*
  * Initialize the ACLs of a new inode. Called from ext2_new_inode.
  *
- * dir->i_sem: down
- * inode->i_sem: up (access to inode is still exclusive)
+ * dir->i_mutex: down
+ * inode->i_mutex: up (access to inode is still exclusive)
  */
 int
 ext2_init_acl(struct inode *inode, struct inode *dir)
@@ -361,7 +361,7 @@ cleanup:
  * for directories) are added. There are no more bits available in the
  * file mode.
  *
- * inode->i_sem: down
+ * inode->i_mutex: down
  */
 int
 ext2_acl_chmod(struct inode *inode)
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index e977f8566d14..00de0a7312a2 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -53,7 +53,7 @@ struct ext2_inode_info {
 #ifdef CONFIG_EXT2_FS_XATTR
         /*
          * Extended attributes can be read independently of the main file
-         * data. Taking i_sem even when reading would cause contention
+         * data. Taking i_mutex even when reading would cause contention
          * between readers of EAs and writers of regular file data, so
          * instead we synchronize on xattr_sem when reading or changing
          * EAs.
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index 522fa70dd8ea..8d6819846fc9 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -1152,7 +1152,7 @@ static ssize_t ext2_quota_write(struct super_block *sb, int type,
         struct buffer_head tmp_bh;
         struct buffer_head *bh;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         while (towrite > 0) {
                 tocopy = sb->s_blocksize - offset < towrite ?
                                 sb->s_blocksize - offset : towrite;
@@ -1189,7 +1189,7 @@ out:
         inode->i_version++;
         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
         mark_inode_dirty(inode);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return len - towrite;
 }
 
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index 0099462d4271..f7a3b5fee274 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -325,7 +325,7 @@ cleanup:
 /*
  * Inode operation listxattr()
  *
- * dentry->d_inode->i_sem: don't care
+ * dentry->d_inode->i_mutex: don't care
  */
 ssize_t
 ext2_listxattr(struct dentry *dentry, char *buffer, size_t size)
diff --git a/fs/ext3/acl.c b/fs/ext3/acl.c
index 3ac38266fc9e..9ed132c96034 100644
--- a/fs/ext3/acl.c
+++ b/fs/ext3/acl.c
@@ -152,7 +152,7 @@ ext3_iset_acl(struct inode *inode, struct posix_acl **i_acl,
 /*
  * Inode operation get_posix_acl().
  *
- * inode->i_sem: don't care
+ * inode->i_mutex: don't care
  */
 static struct posix_acl *
 ext3_get_acl(struct inode *inode, int type)
@@ -216,7 +216,7 @@ ext3_get_acl(struct inode *inode, int type)
 /*
  * Set the access or default ACL of an inode.
  *
- * inode->i_sem: down unless called from ext3_new_inode
+ * inode->i_mutex: down unless called from ext3_new_inode
  */
 static int
 ext3_set_acl(handle_t *handle, struct inode *inode, int type,
@@ -306,8 +306,8 @@ ext3_permission(struct inode *inode, int mask, struct nameidata *nd)
 /*
  * Initialize the ACLs of a new inode. Called from ext3_new_inode.
  *
- * dir->i_sem: down
- * inode->i_sem: up (access to inode is still exclusive)
+ * dir->i_mutex: down
+ * inode->i_mutex: up (access to inode is still exclusive)
  */
 int
 ext3_init_acl(handle_t *handle, struct inode *inode, struct inode *dir)
@@ -368,7 +368,7 @@ cleanup:
  * for directories) are added. There are no more bits available in the
  * file mode.
  *
- * inode->i_sem: down
+ * inode->i_mutex: down
  */
 int
 ext3_acl_chmod(struct inode *inode)
diff --git a/fs/ext3/super.c b/fs/ext3/super.c
index 7c45acf94589..56bf76586019 100644
--- a/fs/ext3/super.c
+++ b/fs/ext3/super.c
@@ -2150,7 +2150,7 @@ int ext3_force_commit(struct super_block *sb)
 
 static void ext3_write_super (struct super_block * sb)
 {
-        if (down_trylock(&sb->s_lock) == 0)
+        if (mutex_trylock(&sb->s_lock) != 0)
                 BUG();
         sb->s_dirt = 0;
 }
@@ -2601,7 +2601,7 @@ static ssize_t ext3_quota_write(struct super_block *sb, int type,
         struct buffer_head *bh;
         handle_t *handle = journal_current_handle();
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         while (towrite > 0) {
                 tocopy = sb->s_blocksize - offset < towrite ?
                                 sb->s_blocksize - offset : towrite;
@@ -2644,7 +2644,7 @@ out:
         inode->i_version++;
         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
         ext3_mark_inode_dirty(handle, inode);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return len - towrite;
 }
 
diff --git a/fs/ext3/xattr.c b/fs/ext3/xattr.c
index 430de9f63be3..238199d82ce5 100644
--- a/fs/ext3/xattr.c
+++ b/fs/ext3/xattr.c
@@ -140,7 +140,7 @@ ext3_xattr_handler(int name_index)
 /*
  * Inode operation listxattr()
  *
- * dentry->d_inode->i_sem: don't care
+ * dentry->d_inode->i_mutex: don't care
  */
 ssize_t
 ext3_listxattr(struct dentry *dentry, char *buffer, size_t size)
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index eef1b81aa294..db0de5c621c7 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -729,13 +729,13 @@ static int fat_dir_ioctl(struct inode * inode, struct file * filp,
 
         buf.dirent = d1;
         buf.result = 0;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         ret = -ENOENT;
         if (!IS_DEADDIR(inode)) {
                 ret = __fat_readdir(inode, filp, &buf, fat_ioctl_filldir,
                                     short_only, both);
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         if (ret >= 0)
                 ret = buf.result;
         return ret;
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 9b07c328a6fc..d30876cf35f5 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -41,7 +41,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
                 if (err)
                         return err;
 
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
 
                 if (IS_RDONLY(inode)) {
                         err = -EROFS;
@@ -103,7 +103,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
                 MSDOS_I(inode)->i_attrs = attr & ATTR_UNUSED;
                 mark_inode_dirty(inode);
         up:
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
                 return err;
         }
         default:
diff --git a/fs/fifo.c b/fs/fifo.c
index 5455916241f0..923371b753ab 100644
--- a/fs/fifo.c
+++ b/fs/fifo.c
@@ -35,7 +35,7 @@ static int fifo_open(struct inode *inode, struct file *filp)
         int ret;
 
         ret = -ERESTARTSYS;
-        if (down_interruptible(PIPE_SEM(*inode)))
+        if (mutex_lock_interruptible(PIPE_MUTEX(*inode)))
                 goto err_nolock_nocleanup;
 
         if (!inode->i_pipe) {
@@ -119,7 +119,7 @@ static int fifo_open(struct inode *inode, struct file *filp)
         }
 
         /* Ok! */
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
         return 0;
 
 err_rd:
@@ -139,7 +139,7 @@ err:
                 free_pipe_info(inode);
 
 err_nocleanup:
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
 err_nolock_nocleanup:
         return ret;
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 05dedddf4289..63d2980df5c9 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -560,9 +560,9 @@ static ssize_t fuse_direct_write(struct file *file, const char __user *buf,
         struct inode *inode = file->f_dentry->d_inode;
         ssize_t res;
         /* Don't allow parallel writes to the same file */
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         res = fuse_direct_io(file, buf, count, ppos, 1);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return res;
 }
 
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index d499393a8ae7..050a49276499 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -547,13 +547,13 @@ static int hfs_file_release(struct inode *inode, struct file *file)
         if (atomic_read(&file->f_count) != 0)
                 return 0;
         if (atomic_dec_and_test(&HFS_I(inode)->opencnt)) {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 hfs_file_truncate(inode);
                 //if (inode->i_flags & S_DEAD) {
                 //      hfs_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
                 //      hfs_delete_inode(inode);
                 //}
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         return 0;
 }
diff --git a/fs/hfsplus/bitmap.c b/fs/hfsplus/bitmap.c
index c7d316455fa0..9fb51632303c 100644
--- a/fs/hfsplus/bitmap.c
+++ b/fs/hfsplus/bitmap.c
@@ -29,7 +29,7 @@ int hfsplus_block_allocate(struct super_block *sb, u32 size, u32 offset, u32 *ma
                 return size;
 
         dprint(DBG_BITMAP, "block_allocate: %u,%u,%u\n", size, offset, len);
-        down(&HFSPLUS_SB(sb).alloc_file->i_sem);
+        mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
         mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
         page = read_cache_page(mapping, offset / PAGE_CACHE_BITS,
                                (filler_t *)mapping->a_ops->readpage, NULL);
@@ -143,7 +143,7 @@ done:
         sb->s_dirt = 1;
         dprint(DBG_BITMAP, "-> %u,%u\n", start, *max);
 out:
-        up(&HFSPLUS_SB(sb).alloc_file->i_sem);
+        mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
         return start;
 }
 
@@ -164,7 +164,7 @@ int hfsplus_block_free(struct super_block *sb, u32 offset, u32 count)
         if ((offset + count) > HFSPLUS_SB(sb).total_blocks)
                 return -2;
 
-        down(&HFSPLUS_SB(sb).alloc_file->i_sem);
+        mutex_lock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
         mapping = HFSPLUS_SB(sb).alloc_file->i_mapping;
         pnr = offset / PAGE_CACHE_BITS;
         page = read_cache_page(mapping, pnr, (filler_t *)mapping->a_ops->readpage, NULL);
@@ -215,7 +215,7 @@ out:
         kunmap(page);
         HFSPLUS_SB(sb).free_blocks += len;
         sb->s_dirt = 1;
-        up(&HFSPLUS_SB(sb).alloc_file->i_sem);
+        mutex_unlock(&HFSPLUS_SB(sb).alloc_file->i_mutex);
 
         return 0;
 }
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index fc98583cf045..983bcd02ac1c 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -276,13 +276,13 @@ static int hfsplus_file_release(struct inode *inode, struct file *file)
         if (atomic_read(&file->f_count) != 0)
                 return 0;
         if (atomic_dec_and_test(&HFSPLUS_I(inode).opencnt)) {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 hfsplus_file_truncate(inode);
                 if (inode->i_flags & S_DEAD) {
                         hfsplus_delete_cat(inode->i_ino, HFSPLUS_SB(sb).hidden_dir, NULL);
                         hfsplus_delete_inode(inode);
                 }
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         return 0;
 }
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index 0217c3a04441..5591f9623aa2 100644
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -32,19 +32,19 @@ static loff_t hpfs_dir_lseek(struct file *filp, loff_t off, int whence)
 
         /*printk("dir lseek\n");*/
         if (new_off == 0 || new_off == 1 || new_off == 11 || new_off == 12 || new_off == 13) goto ok;
-        down(&i->i_sem);
+        mutex_lock(&i->i_mutex);
         pos = ((loff_t) hpfs_de_as_down_as_possible(s, hpfs_inode->i_dno) << 4) + 1;
         while (pos != new_off) {
                 if (map_pos_dirent(i, &pos, &qbh)) hpfs_brelse4(&qbh);
                 else goto fail;
                 if (pos == 12) goto fail;
         }
-        up(&i->i_sem);
+        mutex_unlock(&i->i_mutex);
 ok:
         unlock_kernel();
         return filp->f_pos = new_off;
 fail:
-        up(&i->i_sem);
+        mutex_unlock(&i->i_mutex);
         /*printk("illegal lseek: %016llx\n", new_off);*/
         unlock_kernel();
         return -ESPIPE;
diff --git a/fs/hppfs/hppfs_kern.c b/fs/hppfs/hppfs_kern.c
index 52930915bad8..a44dc5897399 100644
--- a/fs/hppfs/hppfs_kern.c
+++ b/fs/hppfs/hppfs_kern.c
@@ -171,12 +171,12 @@ static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
 
         err = -ENOMEM;
         parent = HPPFS_I(ino)->proc_dentry;
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         proc_dentry = d_lookup(parent, &dentry->d_name);
         if(proc_dentry == NULL){
                 proc_dentry = d_alloc(parent, &dentry->d_name);
                 if(proc_dentry == NULL){
-                        up(&parent->d_inode->i_sem);
+                        mutex_unlock(&parent->d_inode->i_mutex);
                         goto out;
                 }
                 new = (*parent->d_inode->i_op->lookup)(parent->d_inode,
@@ -186,7 +186,7 @@ static struct dentry *hppfs_lookup(struct inode *ino, struct dentry *dentry,
                         proc_dentry = new;
                 }
         }
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
 
         if(IS_ERR(proc_dentry))
                 return(proc_dentry);
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 8c41315a6e42..ff1b7d108bd0 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -118,7 +118,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
 
         vma_len = (loff_t)(vma->vm_end - vma->vm_start);
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         file_accessed(file);
         vma->vm_flags |= VM_HUGETLB | VM_RESERVED;
         vma->vm_ops = &hugetlb_vm_ops;
@@ -133,7 +133,7 @@ static int hugetlbfs_file_mmap(struct file *file, struct vm_area_struct *vma)
         if (inode->i_size < len)
                 inode->i_size = len;
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         return ret;
 }
diff --git a/fs/inode.c b/fs/inode.c
index fd568caf7f74..e08767fd57b0 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -192,7 +192,7 @@ void inode_init_once(struct inode *inode)
         INIT_HLIST_NODE(&inode->i_hash);
         INIT_LIST_HEAD(&inode->i_dentry);
         INIT_LIST_HEAD(&inode->i_devices);
-        sema_init(&inode->i_sem, 1);
+        mutex_init(&inode->i_mutex);
         init_rwsem(&inode->i_alloc_sem);
         INIT_RADIX_TREE(&inode->i_data.page_tree, GFP_ATOMIC);
         rwlock_init(&inode->i_data.tree_lock);
diff --git a/fs/jffs/inode-v23.c b/fs/jffs/inode-v23.c
index 2559ee10beda..fc3855a1aef3 100644
--- a/fs/jffs/inode-v23.c
+++ b/fs/jffs/inode-v23.c
@@ -1415,7 +1415,7 @@ jffs_file_write(struct file *filp, const char *buf, size_t count,
          * This will never trigger with sane page sizes.  leave it in
          * anyway, since I'm thinking about how to merge larger writes
          * (the current idea is to poke a thread that does the actual
-         * I/O and starts by doing a down(&inode->i_sem).  then we
+         * I/O and starts by doing a mutex_lock(&inode->i_mutex).  then we
          * would need to get the page cache pages and have a list of
          * I/O requests and do write-merging here.
          * -- prumpf
diff --git a/fs/jfs/jfs_incore.h b/fs/jfs/jfs_incore.h
index c0fd7b3eadc6..dc21a5bd54d4 100644
--- a/fs/jfs/jfs_incore.h
+++ b/fs/jfs/jfs_incore.h
@@ -58,7 +58,7 @@ struct jfs_inode_info {
         /*
          * rdwrlock serializes xtree between reads & writes and synchronizes
          * changes to special inodes.  It's use would be redundant on
-         * directories since the i_sem taken in the VFS is sufficient.
+         * directories since the i_mutex taken in the VFS is sufficient.
          */
         struct rw_semaphore rdwrlock;
         /*
@@ -68,7 +68,7 @@ struct jfs_inode_info {
          * inode is blocked in txBegin or TxBeginAnon
          */
         struct semaphore commit_sem;
-        /* xattr_sem allows us to access the xattrs without taking i_sem */
+        /* xattr_sem allows us to access the xattrs without taking i_mutex */
         struct rw_semaphore xattr_sem;
         lid_t   xtlid;          /* lid of xtree lock on directory */
 #ifdef CONFIG_JFS_POSIX_ACL
diff --git a/fs/libfs.c b/fs/libfs.c
index 9c50523382e7..63c020e6589e 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -74,7 +74,7 @@ int dcache_dir_close(struct inode *inode, struct file *file)
 
 loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
 {
-        down(&file->f_dentry->d_inode->i_sem);
+        mutex_lock(&file->f_dentry->d_inode->i_mutex);
         switch (origin) {
                 case 1:
                         offset += file->f_pos;
@@ -82,7 +82,7 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
                         if (offset >= 0)
                                 break;
                 default:
-                        up(&file->f_dentry->d_inode->i_sem);
+                        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
                         return -EINVAL;
         }
         if (offset != file->f_pos) {
@@ -106,7 +106,7 @@ loff_t dcache_dir_lseek(struct file *file, loff_t offset, int origin)
                         spin_unlock(&dcache_lock);
                 }
         }
-        up(&file->f_dentry->d_inode->i_sem);
+        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
         return offset;
 }
 
@@ -356,7 +356,7 @@ int simple_commit_write(struct file *file, struct page *page,
 
         /*
          * No need to use i_size_read() here, the i_size
-         * cannot change under us because we hold the i_sem.
+         * cannot change under us because we hold the i_mutex.
          */
         if (pos > inode->i_size)
                 i_size_write(inode, pos);
diff --git a/fs/namei.c b/fs/namei.c
index 300eae088d5f..0a8f073435af 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -438,7 +438,7 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
         struct dentry * result;
         struct inode *dir = parent->d_inode;
 
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
         /*
          * First re-do the cached lookup just in case it was created
          * while we waited for the directory semaphore..
@@ -464,7 +464,7 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
                         else
                                 result = dentry;
                 }
-                up(&dir->i_sem);
+                mutex_unlock(&dir->i_mutex);
                 return result;
         }
 
@@ -472,7 +472,7 @@ static struct dentry * real_lookup(struct dentry * parent, struct qstr * name, s
          * Uhhuh! Nasty case: the cache was re-populated while
          * we waited on the semaphore. Need to revalidate.
          */
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         if (result->d_op && result->d_op->d_revalidate) {
                 if (!result->d_op->d_revalidate(result, nd) && !d_invalidate(result)) {
                         dput(result);
@@ -1366,7 +1366,7 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
         struct dentry *p;
 
         if (p1 == p2) {
-                down(&p1->d_inode->i_sem);
+                mutex_lock(&p1->d_inode->i_mutex);
                 return NULL;
         }
 
@@ -1374,30 +1374,30 @@ struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
 
         for (p = p1; p->d_parent != p; p = p->d_parent) {
                 if (p->d_parent == p2) {
-                        down(&p2->d_inode->i_sem);
-                        down(&p1->d_inode->i_sem);
+                        mutex_lock(&p2->d_inode->i_mutex);
+                        mutex_lock(&p1->d_inode->i_mutex);
                         return p;
                 }
         }
 
         for (p = p2; p->d_parent != p; p = p->d_parent) {
                 if (p->d_parent == p1) {
-                        down(&p1->d_inode->i_sem);
-                        down(&p2->d_inode->i_sem);
+                        mutex_lock(&p1->d_inode->i_mutex);
+                        mutex_lock(&p2->d_inode->i_mutex);
                         return p;
                 }
         }
 
-        down(&p1->d_inode->i_sem);
-        down(&p2->d_inode->i_sem);
+        mutex_lock(&p1->d_inode->i_mutex);
+        mutex_lock(&p2->d_inode->i_mutex);
         return NULL;
 }
 
 void unlock_rename(struct dentry *p1, struct dentry *p2)
 {
-        up(&p1->d_inode->i_sem);
+        mutex_unlock(&p1->d_inode->i_mutex);
         if (p1 != p2) {
-                up(&p2->d_inode->i_sem);
+                mutex_unlock(&p2->d_inode->i_mutex);
                 up(&p1->d_inode->i_sb->s_vfs_rename_sem);
         }
 }
@@ -1563,14 +1563,14 @@ int open_namei(const char * pathname, int flag, int mode, struct nameidata *nd)
 
         dir = nd->dentry;
         nd->flags &= ~LOOKUP_PARENT;
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         path.dentry = lookup_hash(nd);
         path.mnt = nd->mnt;
 
 do_last:
         error = PTR_ERR(path.dentry);
         if (IS_ERR(path.dentry)) {
-                up(&dir->d_inode->i_sem);
+                mutex_unlock(&dir->d_inode->i_mutex);
                 goto exit;
         }
 
@@ -1579,7 +1579,7 @@ do_last:
                 if (!IS_POSIXACL(dir->d_inode))
                         mode &= ~current->fs->umask;
                 error = vfs_create(dir->d_inode, path.dentry, mode, nd);
-                up(&dir->d_inode->i_sem);
+                mutex_unlock(&dir->d_inode->i_mutex);
                 dput(nd->dentry);
                 nd->dentry = path.dentry;
                 if (error)
@@ -1593,7 +1593,7 @@ do_last:
         /*
          * It already exists.
          */
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         error = -EEXIST;
         if (flag & O_EXCL)
@@ -1665,7 +1665,7 @@ do_link:
                 goto exit;
         }
         dir = nd->dentry;
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         path.dentry = lookup_hash(nd);
         path.mnt = nd->mnt;
         __putname(nd->last.name);
@@ -1680,13 +1680,13 @@ do_link:
  * Simple function to lookup and return a dentry and create it
  * if it doesn't exist.  Is SMP-safe.
  *
- * Returns with nd->dentry->d_inode->i_sem locked.
+ * Returns with nd->dentry->d_inode->i_mutex locked.
  */
 struct dentry *lookup_create(struct nameidata *nd, int is_dir)
 {
         struct dentry *dentry = ERR_PTR(-EEXIST);
 
-        down(&nd->dentry->d_inode->i_sem);
+        mutex_lock(&nd->dentry->d_inode->i_mutex);
         /*
          * Yucky last component or no last component at all?
          * (foo/., foo/.., /////)
@@ -1784,7 +1784,7 @@ asmlinkage long sys_mknod(const char __user * filename, int mode, unsigned dev)
                 }
                 dput(dentry);
         }
-        up(&nd.dentry->d_inode->i_sem);
+        mutex_unlock(&nd.dentry->d_inode->i_mutex);
         path_release(&nd);
 out:
         putname(tmp);
@@ -1836,7 +1836,7 @@ asmlinkage long sys_mkdir(const char __user * pathname, int mode)
                         error = vfs_mkdir(nd.dentry->d_inode, dentry, mode);
                         dput(dentry);
                 }
-                up(&nd.dentry->d_inode->i_sem);
+                mutex_unlock(&nd.dentry->d_inode->i_mutex);
                 path_release(&nd);
 out:
                 putname(tmp);
@@ -1885,7 +1885,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
 
         DQUOT_INIT(dir);
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         dentry_unhash(dentry);
         if (d_mountpoint(dentry))
                 error = -EBUSY;
@@ -1897,7 +1897,7 @@ int vfs_rmdir(struct inode *dir, struct dentry *dentry)
                                 dentry->d_inode->i_flags |= S_DEAD;
                 }
         }
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         if (!error) {
                 d_delete(dentry);
         }
@@ -1932,14 +1932,14 @@ asmlinkage long sys_rmdir(const char __user * pathname)
                         error = -EBUSY;
                         goto exit1;
         }
-        down(&nd.dentry->d_inode->i_sem);
+        mutex_lock(&nd.dentry->d_inode->i_mutex);
         dentry = lookup_hash(&nd);
         error = PTR_ERR(dentry);
         if (!IS_ERR(dentry)) {
                 error = vfs_rmdir(nd.dentry->d_inode, dentry);
                 dput(dentry);
         }
-        up(&nd.dentry->d_inode->i_sem);
+        mutex_unlock(&nd.dentry->d_inode->i_mutex);
 exit1:
         path_release(&nd);
 exit:
@@ -1959,7 +1959,7 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
 
         DQUOT_INIT(dir);
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         if (d_mountpoint(dentry))
                 error = -EBUSY;
         else {
@@ -1967,7 +1967,7 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
                 if (!error)
                         error = dir->i_op->unlink(dir, dentry);
         }
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         /* We don't d_delete() NFS sillyrenamed files--they still exist. */
         if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) {
@@ -1979,7 +1979,7 @@ int vfs_unlink(struct inode *dir, struct dentry *dentry)
 
 /*
  * Make sure that the actual truncation of the file will occur outside its
- * directory's i_sem.  Truncate can take a long time if there is a lot of
+ * directory's i_mutex.  Truncate can take a long time if there is a lot of
  * writeout happening, and we don't want to prevent access to the directory
  * while waiting on the I/O.
  */
@@ -2001,7 +2001,7 @@ asmlinkage long sys_unlink(const char __user * pathname)
         error = -EISDIR;
         if (nd.last_type != LAST_NORM)
                 goto exit1;
-        down(&nd.dentry->d_inode->i_sem);
+        mutex_lock(&nd.dentry->d_inode->i_mutex);
         dentry = lookup_hash(&nd);
         error = PTR_ERR(dentry);
         if (!IS_ERR(dentry)) {
@@ -2015,7 +2015,7 @@ asmlinkage long sys_unlink(const char __user * pathname)
         exit2:
                 dput(dentry);
         }
-        up(&nd.dentry->d_inode->i_sem);
+        mutex_unlock(&nd.dentry->d_inode->i_mutex);
         if (inode)
                 iput(inode);    /* truncate the inode here */
 exit1:
@@ -2075,7 +2075,7 @@ asmlinkage long sys_symlink(const char __user * oldname, const char __user * new
                         error = vfs_symlink(nd.dentry->d_inode, dentry, from, S_IALLUGO);
                         dput(dentry);
                 }
-                up(&nd.dentry->d_inode->i_sem);
+                mutex_unlock(&nd.dentry->d_inode->i_mutex);
                 path_release(&nd);
 out:
                 putname(to);
@@ -2113,10 +2113,10 @@ int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_de
         if (error)
                 return error;
 
-        down(&old_dentry->d_inode->i_sem);
+        mutex_lock(&old_dentry->d_inode->i_mutex);
         DQUOT_INIT(dir);
         error = dir->i_op->link(old_dentry, dir, new_dentry);
-        up(&old_dentry->d_inode->i_sem);
+        mutex_unlock(&old_dentry->d_inode->i_mutex);
         if (!error)
                 fsnotify_create(dir, new_dentry->d_name.name);
         return error;
@@ -2157,7 +2157,7 @@ asmlinkage long sys_link(const char __user * oldname, const char __user * newnam
                 error = vfs_link(old_nd.dentry, nd.dentry->d_inode, new_dentry);
                 dput(new_dentry);
         }
-        up(&nd.dentry->d_inode->i_sem);
+        mutex_unlock(&nd.dentry->d_inode->i_mutex);
 out_release:
         path_release(&nd);
 out:
@@ -2178,7 +2178,7 @@ exit:
  *         sb->s_vfs_rename_sem. We might be more accurate, but that's another
  *         story.
  *      c) we have to lock _three_ objects - parents and victim (if it exists).
- *         And that - after we got ->i_sem on parents (until then we don't know
+ *         And that - after we got ->i_mutex on parents (until then we don't know
  *         whether the target exists).  Solution: try to be smart with locking
  *         order for inodes.  We rely on the fact that tree topology may change
  *         only under ->s_vfs_rename_sem _and_ that parent of the object we
@@ -2195,9 +2195,9 @@ exit:
  *         stuff into VFS), but the former is not going away. Solution: the same
  *         trick as in rmdir().
  *      e) conversion from fhandle to dentry may come in the wrong moment - when
- *         we are removing the target. Solution: we will have to grab ->i_sem
+ *         we are removing the target. Solution: we will have to grab ->i_mutex
  *         in the fhandle_to_dentry code. [FIXME - current nfsfh.c relies on
- *         ->i_sem on parents, which works but leads to some truely excessive
+ *         ->i_mutex on parents, which works but leads to some truely excessive
  *         locking].
  */
 static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
@@ -2222,7 +2222,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
 
         target = new_dentry->d_inode;
         if (target) {
-                down(&target->i_sem);
+                mutex_lock(&target->i_mutex);
                 dentry_unhash(new_dentry);
         }
         if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
@@ -2232,7 +2232,7 @@ static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
         if (target) {
                 if (!error)
                         target->i_flags |= S_DEAD;
-                up(&target->i_sem);
+                mutex_unlock(&target->i_mutex);
                 if (d_unhashed(new_dentry))
                         d_rehash(new_dentry);
                 dput(new_dentry);
@@ -2255,7 +2255,7 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
         dget(new_dentry);
         target = new_dentry->d_inode;
         if (target)
-                down(&target->i_sem);
+                mutex_lock(&target->i_mutex);
         if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
                 error = -EBUSY;
         else
@@ -2266,7 +2266,7 @@ static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
                         d_move(old_dentry, new_dentry);
         }
         if (target)
-                up(&target->i_sem);
+                mutex_unlock(&target->i_mutex);
         dput(new_dentry);
         return error;
 }
diff --git a/fs/namespace.c b/fs/namespace.c
index 3e8fb61ad597..f0e353f5bc30 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -814,7 +814,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
                 return -ENOTDIR;
 
         err = -ENOENT;
-        down(&nd->dentry->d_inode->i_sem);
+        mutex_lock(&nd->dentry->d_inode->i_mutex);
         if (IS_DEADDIR(nd->dentry->d_inode))
                 goto out_unlock;
 
@@ -826,7 +826,7 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd)
         if (IS_ROOT(nd->dentry) || !d_unhashed(nd->dentry))
                 err = attach_recursive_mnt(mnt, nd, NULL);
 out_unlock:
-        up(&nd->dentry->d_inode->i_sem);
+        mutex_unlock(&nd->dentry->d_inode->i_mutex);
         if (!err)
                 security_sb_post_addmount(mnt, nd);
         return err;
@@ -962,7 +962,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
                 goto out;
 
         err = -ENOENT;
-        down(&nd->dentry->d_inode->i_sem);
+        mutex_lock(&nd->dentry->d_inode->i_mutex);
         if (IS_DEADDIR(nd->dentry->d_inode))
                 goto out1;
 
@@ -1004,7 +1004,7 @@ static int do_move_mount(struct nameidata *nd, char *old_name)
         list_del_init(&old_nd.mnt->mnt_expire);
         spin_unlock(&vfsmount_lock);
 out1:
-        up(&nd->dentry->d_inode->i_sem);
+        mutex_unlock(&nd->dentry->d_inode->i_mutex);
 out:
         up_write(&namespace_sem);
         if (!err)
@@ -1573,7 +1573,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
         user_nd.dentry = dget(current->fs->root);
         read_unlock(&current->fs->lock);
         down_write(&namespace_sem);
-        down(&old_nd.dentry->d_inode->i_sem);
+        mutex_lock(&old_nd.dentry->d_inode->i_mutex);
         error = -EINVAL;
         if (IS_MNT_SHARED(old_nd.mnt) ||
                 IS_MNT_SHARED(new_nd.mnt->mnt_parent) ||
@@ -1626,7 +1626,7 @@ asmlinkage long sys_pivot_root(const char __user * new_root,
         path_release(&root_parent);
         path_release(&parent_nd);
 out2:
-        up(&old_nd.dentry->d_inode->i_sem);
+        mutex_unlock(&old_nd.dentry->d_inode->i_mutex);
         up_write(&namespace_sem);
         path_release(&user_nd);
         path_release(&old_nd);
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index e9255198f767..a1554bead692 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -194,7 +194,7 @@ int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page)
         spin_unlock(&inode->i_lock);
         /* Ensure consistent page alignment of the data.
          * Note: assumes we have exclusive access to this mapping either
-         *       through inode->i_sem or some other mechanism.
+         *       through inode->i_mutex or some other mechanism.
          */
         if (page->index == 0)
                 invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1);
@@ -573,7 +573,7 @@ static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
 loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin)
 {
-        down(&filp->f_dentry->d_inode->i_sem);
+        mutex_lock(&filp->f_dentry->d_inode->i_mutex);
         switch (origin) {
                 case 1:
                         offset += filp->f_pos;
@@ -589,7 +589,7 @@ loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin)
                 ((struct nfs_open_context *)filp->private_data)->dir_cookie = 0;
         }
 out:
-        up(&filp->f_dentry->d_inode->i_sem);
+        mutex_unlock(&filp->f_dentry->d_inode->i_mutex);
         return offset;
 }
 
@@ -1001,7 +1001,7 @@ static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd)
         openflags &= ~(O_CREAT|O_TRUNC);
 
         /*
-         * Note: we're not holding inode->i_sem and so may be racing with
+         * Note: we're not holding inode->i_mutex and so may be racing with
          * operations that change the directory. We therefore save the
          * change attribute *before* we do the RPC call.
          */
@@ -1051,7 +1051,7 @@ static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc)
                 return dentry;
         if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR))
                 return NULL;
-        /* Note: caller is already holding the dir->i_sem! */
+        /* Note: caller is already holding the dir->i_mutex! */
         dentry = d_alloc(parent, &name);
         if (dentry == NULL)
                 return NULL;
diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 954cf893d50c..be963a133aaa 100644
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -121,9 +121,9 @@ out:
 static void
 nfsd4_sync_rec_dir(void)
 {
-        down(&rec_dir.dentry->d_inode->i_sem);
+        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
         nfsd_sync_dir(rec_dir.dentry);
-        up(&rec_dir.dentry->d_inode->i_sem);
+        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
 }
 
 int
@@ -143,7 +143,7 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
         nfs4_save_user(&uid, &gid);
 
         /* lock the parent */
-        down(&rec_dir.dentry->d_inode->i_sem);
+        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
 
         dentry = lookup_one_len(dname, rec_dir.dentry, HEXDIR_LEN-1);
         if (IS_ERR(dentry)) {
@@ -159,7 +159,7 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
 out_put:
         dput(dentry);
 out_unlock:
-        up(&rec_dir.dentry->d_inode->i_sem);
+        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
         if (status == 0) {
                 clp->cl_firststate = 1;
                 nfsd4_sync_rec_dir();
@@ -259,9 +259,9 @@ nfsd4_remove_clid_file(struct dentry *dir, struct dentry *dentry)
                 printk("nfsd4: non-file found in client recovery directory\n");
                 return -EINVAL;
         }
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         status = vfs_unlink(dir->d_inode, dentry);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
         return status;
 }
 
@@ -274,9 +274,9 @@ nfsd4_clear_clid_dir(struct dentry *dir, struct dentry *dentry)
          * any regular files anyway, just in case the directory was created by
          * a kernel from the future.... */
         nfsd4_list_rec_dir(dentry, nfsd4_remove_clid_file);
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         status = vfs_rmdir(dir->d_inode, dentry);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
         return status;
 }
 
@@ -288,9 +288,9 @@ nfsd4_unlink_clid_dir(char *name, int namlen)
 
         dprintk("NFSD: nfsd4_unlink_clid_dir. name %.*s\n", namlen, name);
 
-        down(&rec_dir.dentry->d_inode->i_sem);
+        mutex_lock(&rec_dir.dentry->d_inode->i_mutex);
         dentry = lookup_one_len(name, rec_dir.dentry, namlen);
-        up(&rec_dir.dentry->d_inode->i_sem);
+        mutex_unlock(&rec_dir.dentry->d_inode->i_mutex);
         if (IS_ERR(dentry)) {
                 status = PTR_ERR(dentry);
                 return status;
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index df4019f04560..bb36b4304491 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -390,12 +390,12 @@ set_nfsv4_acl_one(struct dentry *dentry, struct posix_acl *pacl, char *key)
 
         error = -EOPNOTSUPP;
         if (inode->i_op && inode->i_op->setxattr) {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 security_inode_setxattr(dentry, key, buf, len, 0);
                 error = inode->i_op->setxattr(dentry, key, buf, len, 0);
                 if (!error)
                         security_inode_post_setxattr(dentry, key, buf, len, 0);
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
 out:
         kfree(buf);
@@ -739,9 +739,9 @@ nfsd_sync(struct file *filp)
         int err;
         struct inode *inode = filp->f_dentry->d_inode;
         dprintk("nfsd: sync file %s\n", filp->f_dentry->d_name.name);
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         err=nfsd_dosync(filp, filp->f_dentry, filp->f_op);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         return err;
 }
@@ -885,9 +885,9 @@ static void kill_suid(struct dentry *dentry)
         struct iattr    ia;
         ia.ia_valid = ATTR_KILL_SUID | ATTR_KILL_SGID;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         notify_change(dentry, &ia);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 }
 
 static inline int
diff --git a/fs/ntfs/attrib.c b/fs/ntfs/attrib.c
index eda056bac256..9480a0526cd3 100644
--- a/fs/ntfs/attrib.c
+++ b/fs/ntfs/attrib.c
@@ -1532,7 +1532,7 @@ int ntfs_resident_attr_value_resize(MFT_RECORD *m, ATTR_RECORD *a,
  * NOTE to self: No changes in the attribute list are required to move from
  *               a resident to a non-resident attribute.
  *
- * Locking: - The caller must hold i_sem on the inode.
+ * Locking: - The caller must hold i_mutex on the inode.
  */
 int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
 {
@@ -1728,7 +1728,7 @@ int ntfs_attr_make_non_resident(ntfs_inode *ni, const u32 data_size)
         /*
          * This needs to be last since the address space operations ->readpage
          * and ->writepage can run concurrently with us as they are not
-         * serialized on i_sem.  Note, we are not allowed to fail once we flip
+         * serialized on i_mutex.  Note, we are not allowed to fail once we flip
          * this switch, which is another reason to do this last.
          */
         NInoSetNonResident(ni);
diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 795c3d1930f5..b0690d4c8906 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -69,7 +69,7 @@ ntfschar I30[5] = { const_cpu_to_le16('$'), const_cpu_to_le16('I'),
  * work but we don't care for how quickly one can access them. This also fixes
  * the dcache aliasing issues.
  *
- * Locking:  - Caller must hold i_sem on the directory.
+ * Locking:  - Caller must hold i_mutex on the directory.
  *           - Each page cache page in the index allocation mapping must be
  *             locked whilst being accessed otherwise we may find a corrupt
  *             page due to it being under ->writepage at the moment which
@@ -1085,11 +1085,11 @@ static inline int ntfs_filldir(ntfs_volume *vol, loff_t fpos,
  * While this will return the names in random order this doesn't matter for
  * ->readdir but OTOH results in a faster ->readdir.
  *
- * VFS calls ->readdir without BKL but with i_sem held. This protects the VFS
+ * VFS calls ->readdir without BKL but with i_mutex held. This protects the VFS
  * parts (e.g. ->f_pos and ->i_size, and it also protects against directory
  * modifications).
  *
- * Locking:  - Caller must hold i_sem on the directory.
+ * Locking:  - Caller must hold i_mutex on the directory.
  *           - Each page cache page in the index allocation mapping must be
  *             locked whilst being accessed otherwise we may find a corrupt
  *             page due to it being under ->writepage at the moment which
@@ -1520,7 +1520,7 @@ static int ntfs_dir_open(struct inode *vi, struct file *filp)
  * Note: In the past @filp could be NULL so we ignore it as we don't need it
  * anyway.
  *
- * Locking: Caller must hold i_sem on the inode.
+ * Locking: Caller must hold i_mutex on the inode.
  *
  * TODO: We should probably also write all attribute/index inodes associated
  * with this inode but since we have no simple way of getting to them we ignore
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 727533891813..30f71acdc1cb 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -106,7 +106,7 @@ static int ntfs_file_open(struct inode *vi, struct file *filp)
  * this is the case, the necessary zeroing will also have happened and that all
  * metadata is self-consistent.
  *
- * Locking: i_sem on the vfs inode corrseponsind to the ntfs inode @ni must be
+ * Locking: i_mutex on the vfs inode corrseponsind to the ntfs inode @ni must be
  *          held by the caller.
  */
 static int ntfs_attr_extend_initialized(ntfs_inode *ni, const s64 new_init_size,
@@ -473,7 +473,7 @@ static inline int ntfs_submit_bh_for_read(struct buffer_head *bh)
  * @bytes:      number of bytes to be written
  *
  * This is called for non-resident attributes from ntfs_file_buffered_write()
- * with i_sem held on the inode (@pages[0]->mapping->host).  There are
+ * with i_mutex held on the inode (@pages[0]->mapping->host).  There are
  * @nr_pages pages in @pages which are locked but not kmap()ped.  The source
  * data has not yet been copied into the @pages.
  * 
@@ -1637,7 +1637,7 @@ err_out:
  * @pos:        byte position in file at which the write begins
  * @bytes:      number of bytes to be written
  *
- * This is called from ntfs_file_buffered_write() with i_sem held on the inode
+ * This is called from ntfs_file_buffered_write() with i_mutex held on the inode
  * (@pages[0]->mapping->host).  There are @nr_pages pages in @pages which are
  * locked but not kmap()ped.  The source data has already been copied into the
  * @page.  ntfs_prepare_pages_for_non_resident_write() has been called before
@@ -1814,7 +1814,7 @@ err_out:
 /**
  * ntfs_file_buffered_write -
  *
- * Locking: The vfs is holding ->i_sem on the inode.
+ * Locking: The vfs is holding ->i_mutex on the inode.
  */
 static ssize_t ntfs_file_buffered_write(struct kiocb *iocb,
                 const struct iovec *iov, unsigned long nr_segs,
@@ -2196,9 +2196,9 @@ static ssize_t ntfs_file_aio_write(struct kiocb *iocb, const char __user *buf,
 
         BUG_ON(iocb->ki_pos != pos);
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         ret = ntfs_file_aio_write_nolock(iocb, &local_iov, 1, &iocb->ki_pos);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
                 int err = sync_page_range(inode, mapping, pos, ret);
                 if (err < 0)
@@ -2221,12 +2221,12 @@ static ssize_t ntfs_file_writev(struct file *file, const struct iovec *iov,
         struct kiocb kiocb;
         ssize_t ret;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         init_sync_kiocb(&kiocb, file);
         ret = ntfs_file_aio_write_nolock(&kiocb, iov, nr_segs, ppos);
         if (ret == -EIOCBQUEUED)
                 ret = wait_on_sync_kiocb(&kiocb);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
                 int err = sync_page_range(inode, mapping, *ppos - ret, ret);
                 if (err < 0)
@@ -2269,7 +2269,7 @@ static ssize_t ntfs_file_write(struct file *file, const char __user *buf,
  * Note: In the past @filp could be NULL so we ignore it as we don't need it
  * anyway.
  *
- * Locking: Caller must hold i_sem on the inode.
+ * Locking: Caller must hold i_mutex on the inode.
  *
  * TODO: We should probably also write all attribute/index inodes associated
  * with this inode but since we have no simple way of getting to them we ignore
diff --git a/fs/ntfs/index.c b/fs/ntfs/index.c
index 8f2d5727546f..9f5427c2d105 100644
--- a/fs/ntfs/index.c
+++ b/fs/ntfs/index.c
@@ -32,7 +32,7 @@
  * Allocate a new index context, initialize it with @idx_ni and return it.
  * Return NULL if allocation failed.
  *
- * Locking:  Caller must hold i_sem on the index inode.
+ * Locking:  Caller must hold i_mutex on the index inode.
  */
 ntfs_index_context *ntfs_index_ctx_get(ntfs_inode *idx_ni)
 {
@@ -50,7 +50,7 @@ ntfs_index_context *ntfs_index_ctx_get(ntfs_inode *idx_ni)
  *
  * Release the index context @ictx, releasing all associated resources.
  *
- * Locking:  Caller must hold i_sem on the index inode.
+ * Locking:  Caller must hold i_mutex on the index inode.
  */
 void ntfs_index_ctx_put(ntfs_index_context *ictx)
 {
@@ -106,7 +106,7 @@ void ntfs_index_ctx_put(ntfs_index_context *ictx)
  * or ntfs_index_entry_write() before the call to ntfs_index_ctx_put() to
  * ensure that the changes are written to disk.
  *
- * Locking:  - Caller must hold i_sem on the index inode.
+ * Locking:  - Caller must hold i_mutex on the index inode.
  *           - Each page cache page in the index allocation mapping must be
  *             locked whilst being accessed otherwise we may find a corrupt
  *             page due to it being under ->writepage at the moment which
diff --git a/fs/ntfs/inode.c b/fs/ntfs/inode.c
index b24f4c4b2c5c..bda7a08911a5 100644
--- a/fs/ntfs/inode.c
+++ b/fs/ntfs/inode.c
@@ -2125,13 +2125,13 @@ void ntfs_put_inode(struct inode *vi)
                 ntfs_inode *ni = NTFS_I(vi);
                 if (NInoIndexAllocPresent(ni)) {
                         struct inode *bvi = NULL;
-                        down(&vi->i_sem);
+                        mutex_lock(&vi->i_mutex);
                         if (atomic_read(&vi->i_count) == 2) {
                                 bvi = ni->itype.index.bmp_ino;
                                 if (bvi)
                                         ni->itype.index.bmp_ino = NULL;
                         }
-                        up(&vi->i_sem);
+                        mutex_unlock(&vi->i_mutex);
                         if (bvi)
                                 iput(bvi);
                 }
@@ -2311,7 +2311,7 @@ static const char *es = "  Leaving inconsistent metadata.  Unmount and run "
  *
  * Returns 0 on success or -errno on error.
  *
- * Called with ->i_sem held.  In all but one case ->i_alloc_sem is held for
+ * Called with ->i_mutex held.  In all but one case ->i_alloc_sem is held for
  * writing.  The only case in the kernel where ->i_alloc_sem is not held is
  * mm/filemap.c::generic_file_buffered_write() where vmtruncate() is called
  * with the current i_size as the offset.  The analogous place in NTFS is in
@@ -2831,7 +2831,7 @@ void ntfs_truncate_vfs(struct inode *vi) {
  * We also abort all changes of user, group, and mode as we do not implement
  * the NTFS ACLs yet.
  *
- * Called with ->i_sem held.  For the ATTR_SIZE (i.e. ->truncate) case, also
+ * Called with ->i_mutex held.  For the ATTR_SIZE (i.e. ->truncate) case, also
  * called with ->i_alloc_sem held for writing.
  *
  * Basically this is a copy of generic notify_change() and inode_setattr()
diff --git a/fs/ntfs/namei.c b/fs/ntfs/namei.c
index 351dbc3b6e40..5ea9eb93af62 100644
--- a/fs/ntfs/namei.c
+++ b/fs/ntfs/namei.c
@@ -96,7 +96,7 @@
  *    name. We then convert the name to the current NLS code page, and proceed
  *    searching for a dentry with this name, etc, as in case 2), above.
  *
- * Locking: Caller must hold i_sem on the directory.
+ * Locking: Caller must hold i_mutex on the directory.
  */
 static struct dentry *ntfs_lookup(struct inode *dir_ino, struct dentry *dent,
                 struct nameidata *nd)
@@ -254,7 +254,7 @@ handle_name:
         nls_name.hash = full_name_hash(nls_name.name, nls_name.len);
 
         /*
-         * Note: No need for dent->d_lock lock as i_sem is held on the
+         * Note: No need for dent->d_lock lock as i_mutex is held on the
          * parent inode.
          */
 
@@ -374,7 +374,7 @@ struct inode_operations ntfs_dir_inode_ops = {
  * The code is based on the ext3 ->get_parent() implementation found in
  * fs/ext3/namei.c::ext3_get_parent().
  *
- * Note: ntfs_get_parent() is called with @child_dent->d_inode->i_sem down.
+ * Note: ntfs_get_parent() is called with @child_dent->d_inode->i_mutex down.
  *
  * Return the dentry of the parent directory on success or the error code on
  * error (IS_ERR() is true).
diff --git a/fs/ntfs/quota.c b/fs/ntfs/quota.c
index 833df2a4e9fb..d0ef4182147b 100644
--- a/fs/ntfs/quota.c
+++ b/fs/ntfs/quota.c
@@ -48,7 +48,7 @@ BOOL ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
                 ntfs_error(vol->sb, "Quota inodes are not open.");
                 return FALSE;
         }
-        down(&vol->quota_q_ino->i_sem);
+        mutex_lock(&vol->quota_q_ino->i_mutex);
         ictx = ntfs_index_ctx_get(NTFS_I(vol->quota_q_ino));
         if (!ictx) {
                 ntfs_error(vol->sb, "Failed to get index context.");
@@ -98,7 +98,7 @@ BOOL ntfs_mark_quotas_out_of_date(ntfs_volume *vol)
         ntfs_index_entry_mark_dirty(ictx);
 set_done:
         ntfs_index_ctx_put(ictx);
-        up(&vol->quota_q_ino->i_sem);
+        mutex_unlock(&vol->quota_q_ino->i_mutex);
         /*
          * We set the flag so we do not try to mark the quotas out of date
          * again on remount.
@@ -110,7 +110,7 @@ done:
 err_out:
         if (ictx)
                 ntfs_index_ctx_put(ictx);
-        up(&vol->quota_q_ino->i_sem);
+        mutex_unlock(&vol->quota_q_ino->i_mutex);
         return FALSE;
 }
 
diff --git a/fs/ntfs/super.c b/fs/ntfs/super.c
index 6c16db9e1a8a..280e383fc84e 100644
--- a/fs/ntfs/super.c
+++ b/fs/ntfs/super.c
@@ -1213,10 +1213,10 @@ static int check_windows_hibernation_status(ntfs_volume *vol)
          * Find the inode number for the hibernation file by looking up the
          * filename hiberfil.sys in the root directory.
          */
-        down(&vol->root_ino->i_sem);
+        mutex_lock(&vol->root_ino->i_mutex);
         mref = ntfs_lookup_inode_by_name(NTFS_I(vol->root_ino), hiberfil, 12,
                         &name);
-        up(&vol->root_ino->i_sem);
+        mutex_unlock(&vol->root_ino->i_mutex);
         if (IS_ERR_MREF(mref)) {
                 ret = MREF_ERR(mref);
                 /* If the file does not exist, Windows is not hibernated. */
@@ -1307,10 +1307,10 @@ static BOOL load_and_init_quota(ntfs_volume *vol)
          * Find the inode number for the quota file by looking up the filename
          * $Quota in the extended system files directory $Extend.
          */
-        down(&vol->extend_ino->i_sem);
+        mutex_lock(&vol->extend_ino->i_mutex);
         mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), Quota, 6,
                         &name);
-        up(&vol->extend_ino->i_sem);
+        mutex_unlock(&vol->extend_ino->i_mutex);
         if (IS_ERR_MREF(mref)) {
                 /*
                  * If the file does not exist, quotas are disabled and have
@@ -1390,10 +1390,10 @@ static BOOL load_and_init_usnjrnl(ntfs_volume *vol)
          * Find the inode number for the transaction log file by looking up the
          * filename $UsnJrnl in the extended system files directory $Extend.
          */
-        down(&vol->extend_ino->i_sem);
+        mutex_lock(&vol->extend_ino->i_mutex);
         mref = ntfs_lookup_inode_by_name(NTFS_I(vol->extend_ino), UsnJrnl, 8,
                         &name);
-        up(&vol->extend_ino->i_sem);
+        mutex_unlock(&vol->extend_ino->i_mutex);
         if (IS_ERR_MREF(mref)) {
                 /*
                  * If the file does not exist, transaction logging is disabled,
@@ -2312,9 +2312,9 @@ static void ntfs_put_super(struct super_block *sb)
         if (!list_empty(&sb->s_dirty)) {
                 const char *s1, *s2;
 
-                down(&vol->mft_ino->i_sem);
+                mutex_lock(&vol->mft_ino->i_mutex);
                 truncate_inode_pages(vol->mft_ino->i_mapping, 0);
-                up(&vol->mft_ino->i_sem);
+                mutex_unlock(&vol->mft_ino->i_mutex);
                 write_inode_now(vol->mft_ino, 1);
                 if (!list_empty(&sb->s_dirty)) {
                         static const char *_s1 = "inodes";
diff --git a/fs/ocfs2/alloc.c b/fs/ocfs2/alloc.c
index 465f797451ee..6b9812db3779 100644
--- a/fs/ocfs2/alloc.c
+++ b/fs/ocfs2/alloc.c
@@ -966,7 +966,7 @@ static int ocfs2_truncate_log_append(struct ocfs2_super *osb,
         mlog_entry("start_blk = %"MLFu64", num_clusters = %u\n", start_blk,
                    num_clusters);
 
-        BUG_ON(!down_trylock(&tl_inode->i_sem));
+        BUG_ON(mutex_trylock(&tl_inode->i_mutex));
 
         start_cluster = ocfs2_blocks_to_clusters(osb->sb, start_blk);
 
@@ -1108,7 +1108,7 @@ bail:
         return status;
 }
 
-/* Expects you to already be holding tl_inode->i_sem */
+/* Expects you to already be holding tl_inode->i_mutex */
 static int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
 {
         int status;
@@ -1123,7 +1123,7 @@ static int __ocfs2_flush_truncate_log(struct ocfs2_super *osb)
 
         mlog_entry_void();
 
-        BUG_ON(!down_trylock(&tl_inode->i_sem));
+        BUG_ON(mutex_trylock(&tl_inode->i_mutex));
 
         di = (struct ocfs2_dinode *) tl_bh->b_data;
         tl = &di->id2.i_dealloc;
@@ -1198,9 +1198,9 @@ int ocfs2_flush_truncate_log(struct ocfs2_super *osb)
         int status;
         struct inode *tl_inode = osb->osb_tl_inode;
 
-        down(&tl_inode->i_sem);
+        mutex_lock(&tl_inode->i_mutex);
         status = __ocfs2_flush_truncate_log(osb);
-        up(&tl_inode->i_sem);
+        mutex_unlock(&tl_inode->i_mutex);
 
         return status;
 }
@@ -1363,7 +1363,7 @@ int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
         mlog(0, "cleanup %u records from %"MLFu64"\n", num_recs,
              tl_copy->i_blkno);
 
-        down(&tl_inode->i_sem);
+        mutex_lock(&tl_inode->i_mutex);
         for(i = 0; i < num_recs; i++) {
                 if (ocfs2_truncate_log_needs_flush(osb)) {
                         status = __ocfs2_flush_truncate_log(osb);
@@ -1395,7 +1395,7 @@ int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
         }
 
 bail_up:
-        up(&tl_inode->i_sem);
+        mutex_unlock(&tl_inode->i_mutex);
 
         mlog_exit(status);
         return status;
@@ -1840,7 +1840,7 @@ start:
 
         mlog(0, "clusters_to_del = %u in this pass\n", clusters_to_del);
 
-        down(&tl_inode->i_sem);
+        mutex_lock(&tl_inode->i_mutex);
         tl_sem = 1;
         /* ocfs2_truncate_log_needs_flush guarantees us at least one
          * record is free for use. If there isn't any, we flush to get
@@ -1875,7 +1875,7 @@ start:
                 goto bail;
         }
 
-        up(&tl_inode->i_sem);
+        mutex_unlock(&tl_inode->i_mutex);
         tl_sem = 0;
 
         ocfs2_commit_trans(handle);
@@ -1890,7 +1890,7 @@ bail:
         ocfs2_schedule_truncate_log_flush(osb, 1);
 
         if (tl_sem)
-                up(&tl_inode->i_sem);
+                mutex_unlock(&tl_inode->i_mutex);
 
         if (handle)
                 ocfs2_commit_trans(handle);
@@ -1994,7 +1994,7 @@ int ocfs2_prepare_truncate(struct ocfs2_super *osb,
                         goto bail;
                 }
 
-                down(&ext_alloc_inode->i_sem);
+                mutex_lock(&ext_alloc_inode->i_mutex);
                 (*tc)->tc_ext_alloc_inode = ext_alloc_inode;
 
                 status = ocfs2_meta_lock(ext_alloc_inode,
@@ -2026,7 +2026,7 @@ static void ocfs2_free_truncate_context(struct ocfs2_truncate_context *tc)
                 if (tc->tc_ext_alloc_locked)
                         ocfs2_meta_unlock(tc->tc_ext_alloc_inode, 1);
 
-                up(&tc->tc_ext_alloc_inode->i_sem);
+                mutex_unlock(&tc->tc_ext_alloc_inode->i_mutex);
                 iput(tc->tc_ext_alloc_inode);
         }
 
diff --git a/fs/ocfs2/cluster/nodemanager.c b/fs/ocfs2/cluster/nodemanager.c
index 5fd60c105913..cf7828f23361 100644
--- a/fs/ocfs2/cluster/nodemanager.c
+++ b/fs/ocfs2/cluster/nodemanager.c
@@ -653,7 +653,7 @@ static struct config_group *o2nm_cluster_group_make_group(struct config_group *g
         struct config_group *o2hb_group = NULL, *ret = NULL;
         void *defs = NULL;
 
-        /* this runs under the parent dir's i_sem; there can be only
+        /* this runs under the parent dir's i_mutex; there can be only
          * one caller in here at a time */
         if (o2nm_single_cluster)
                 goto out; /* ENOSPC */
diff --git a/fs/ocfs2/dir.c b/fs/ocfs2/dir.c
index 856e20ae8263..57158fa75d91 100644
--- a/fs/ocfs2/dir.c
+++ b/fs/ocfs2/dir.c
@@ -202,7 +202,7 @@ bail:
 }
 
 /*
- * NOTE: this should always be called with parent dir i_sem taken.
+ * NOTE: this should always be called with parent dir i_mutex taken.
  */
 int ocfs2_find_files_on_disk(const char *name,
                              int namelen,
@@ -245,7 +245,7 @@ leave:
  * Return 0 if the name does not exist
  * Return -EEXIST if the directory contains the name
  *
- * Callers should have i_sem + a cluster lock on dir
+ * Callers should have i_mutex + a cluster lock on dir
  */
 int ocfs2_check_dir_for_entry(struct inode *dir,
                               const char *name,
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 72ae9e3306f4..ca5f9f90d794 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -492,7 +492,7 @@ restart_all:
         }
 
         /* blocks peope in read/write from reading our allocation
-         * until we're done changing it. We depend on i_sem to block
+         * until we're done changing it. We depend on i_mutex to block
          * other extend/truncate calls while we're here. Ordering wrt
          * start_trans is important here -- always do it before! */
         down_write(&OCFS2_I(inode)->ip_alloc_sem);
@@ -958,8 +958,8 @@ static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
                 filp->f_flags &= ~O_DIRECT;
 #endif
 
-        down(&inode->i_sem);
-        /* to match setattr's i_sem -> i_alloc_sem -> rw_lock ordering */
+        mutex_lock(&inode->i_mutex);
+        /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
         if (filp->f_flags & O_DIRECT) {
                 have_alloc_sem = 1;
                 down_read(&inode->i_alloc_sem);
@@ -1123,7 +1123,7 @@ out:
                 up_read(&inode->i_alloc_sem);
         if (rw_level != -1) 
                 ocfs2_rw_unlock(inode, rw_level);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         mlog_exit(ret);
         return ret;
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index a91ba4dec936..d4ecc0627716 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -485,10 +485,10 @@ static int ocfs2_remove_inode(struct inode *inode,
                 goto bail;
         }
 
-        down(&inode_alloc_inode->i_sem);
+        mutex_lock(&inode_alloc_inode->i_mutex);
         status = ocfs2_meta_lock(inode_alloc_inode, NULL, &inode_alloc_bh, 1);
         if (status < 0) {
-                up(&inode_alloc_inode->i_sem);
+                mutex_unlock(&inode_alloc_inode->i_mutex);
 
                 mlog_errno(status);
                 goto bail;
@@ -536,7 +536,7 @@ bail_commit:
         ocfs2_commit_trans(handle);
 bail_unlock:
         ocfs2_meta_unlock(inode_alloc_inode, 1);
-        up(&inode_alloc_inode->i_sem);
+        mutex_unlock(&inode_alloc_inode->i_mutex);
         brelse(inode_alloc_bh);
 bail:
         iput(inode_alloc_inode);
@@ -567,10 +567,10 @@ static int ocfs2_wipe_inode(struct inode *inode,
         /* Lock the orphan dir. The lock will be held for the entire
          * delete_inode operation. We do this now to avoid races with
          * recovery completion on other nodes. */
-        down(&orphan_dir_inode->i_sem);
+        mutex_lock(&orphan_dir_inode->i_mutex);
         status = ocfs2_meta_lock(orphan_dir_inode, NULL, &orphan_dir_bh, 1);
         if (status < 0) {
-                up(&orphan_dir_inode->i_sem);
+                mutex_unlock(&orphan_dir_inode->i_mutex);
 
                 mlog_errno(status);
                 goto bail;
@@ -593,7 +593,7 @@ static int ocfs2_wipe_inode(struct inode *inode,
 
 bail_unlock_dir:
         ocfs2_meta_unlock(orphan_dir_inode, 1);
-        up(&orphan_dir_inode->i_sem);
+        mutex_unlock(&orphan_dir_inode->i_mutex);
         brelse(orphan_dir_bh);
 bail:
         iput(orphan_dir_inode);
diff --git a/fs/ocfs2/journal.c b/fs/ocfs2/journal.c
index 04428042e5e5..303c8d96457f 100644
--- a/fs/ocfs2/journal.c
+++ b/fs/ocfs2/journal.c
@@ -216,7 +216,7 @@ void ocfs2_handle_add_inode(struct ocfs2_journal_handle *handle,
         atomic_inc(&inode->i_count);
 
         /* we're obviously changing it... */
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 
         /* sanity check */
         BUG_ON(OCFS2_I(inode)->ip_handle);
@@ -241,7 +241,7 @@ static void ocfs2_handle_unlock_inodes(struct ocfs2_journal_handle *handle)
                 OCFS2_I(inode)->ip_handle = NULL;
                 list_del_init(&OCFS2_I(inode)->ip_handle_list);
 
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
                 iput(inode);
         }
 }
@@ -1433,10 +1433,10 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
                 goto out;
         }
 
-        down(&orphan_dir_inode->i_sem);
+        mutex_lock(&orphan_dir_inode->i_mutex);
         status = ocfs2_meta_lock(orphan_dir_inode, NULL, NULL, 0);
         if (status < 0) {
-                up(&orphan_dir_inode->i_sem);
+                mutex_unlock(&orphan_dir_inode->i_mutex);
                 mlog_errno(status);
                 goto out;
         }
@@ -1451,7 +1451,7 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
                 if (!bh)
                         status = -EINVAL;
                 if (status < 0) {
-                        up(&orphan_dir_inode->i_sem);
+                        mutex_unlock(&orphan_dir_inode->i_mutex);
                         if (bh)
                                 brelse(bh);
                         mlog_errno(status);
@@ -1465,7 +1465,7 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
 
                         if (!ocfs2_check_dir_entry(orphan_dir_inode,
                                                   de, bh, local)) {
-                                up(&orphan_dir_inode->i_sem);
+                                mutex_unlock(&orphan_dir_inode->i_mutex);
                                 status = -EINVAL;
                                 mlog_errno(status);
                                 brelse(bh);
@@ -1509,7 +1509,7 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
                 }
                 brelse(bh);
         }
-        up(&orphan_dir_inode->i_sem);
+        mutex_unlock(&orphan_dir_inode->i_mutex);
 
         ocfs2_meta_unlock(orphan_dir_inode, 0);
         have_disk_lock = 0;
diff --git a/fs/ocfs2/localalloc.c b/fs/ocfs2/localalloc.c
index fe373a2101d9..149b35181666 100644
--- a/fs/ocfs2/localalloc.c
+++ b/fs/ocfs2/localalloc.c
@@ -334,7 +334,7 @@ int ocfs2_begin_local_alloc_recovery(struct ocfs2_super *osb,
                 goto bail;
         }
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 
         status = ocfs2_read_block(osb, OCFS2_I(inode)->ip_blkno,
                                   &alloc_bh, 0, inode);
@@ -367,7 +367,7 @@ bail:
                 brelse(alloc_bh);
 
         if (inode) {
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
                 iput(inode);
         }
 
@@ -446,7 +446,7 @@ bail:
 
 /*
  * make sure we've got at least bitswanted contiguous bits in the
- * local alloc. You lose them when you drop i_sem.
+ * local alloc. You lose them when you drop i_mutex.
  *
  * We will add ourselves to the transaction passed in, but may start
  * our own in order to shift windows.
diff --git a/fs/ocfs2/super.c b/fs/ocfs2/super.c
index 48bf7f0ce544..364d64bd5f10 100644
--- a/fs/ocfs2/super.c
+++ b/fs/ocfs2/super.c
@@ -169,7 +169,7 @@ static match_table_t tokens = {
  */
 static void ocfs2_write_super(struct super_block *sb)
 {
-        if (down_trylock(&sb->s_lock) == 0)
+        if (mutex_trylock(&sb->s_lock) != 0)
                 BUG();
         sb->s_dirt = 0;
 }
diff --git a/fs/open.c b/fs/open.c
index 75f3329e8a67..a3b3a9b5c2ff 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -211,9 +211,9 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
                 newattrs.ia_valid |= ATTR_FILE;
         }
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         err = notify_change(dentry, &newattrs);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         return err;
 }
 
@@ -398,9 +398,9 @@ asmlinkage long sys_utime(char __user * filename, struct utimbuf __user * times)
                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
                         goto dput_and_out;
         }
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 dput_and_out:
         path_release(&nd);
 out:
@@ -451,9 +451,9 @@ long do_utimes(char __user * filename, struct timeval * times)
                     (error = vfs_permission(&nd, MAY_WRITE)) != 0)
                         goto dput_and_out;
         }
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 dput_and_out:
         path_release(&nd);
 out:
@@ -620,13 +620,13 @@ asmlinkage long sys_fchmod(unsigned int fd, mode_t mode)
         err = -EPERM;
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                 goto out_putf;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
                 mode = inode->i_mode;
         newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
         newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
         err = notify_change(dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
 out_putf:
         fput(file);
@@ -654,13 +654,13 @@ asmlinkage long sys_chmod(const char __user * filename, mode_t mode)
         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
                 goto dput_and_out;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (mode == (mode_t) -1)
                 mode = inode->i_mode;
         newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
         newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
         error = notify_change(nd.dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
 dput_and_out:
         path_release(&nd);
@@ -696,9 +696,9 @@ static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
         }
         if (!S_ISDIR(inode->i_mode))
                 newattrs.ia_valid |= ATTR_KILL_SUID|ATTR_KILL_SGID;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         error = notify_change(dentry, &newattrs);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 out:
         return error;
 }
diff --git a/fs/pipe.c b/fs/pipe.c
index 66aa0b938d6a..acb030b61fb0 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -44,10 +44,10 @@ void pipe_wait(struct inode * inode)
          * is considered a noninteractive wait:
          */
         prepare_to_wait(PIPE_WAIT(*inode), &wait, TASK_INTERRUPTIBLE|TASK_NONINTERACTIVE);
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
         schedule();
         finish_wait(PIPE_WAIT(*inode), &wait);
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
 }
 
 static inline int
@@ -136,7 +136,7 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
 
         do_wakeup = 0;
         ret = 0;
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         info = inode->i_pipe;
         for (;;) {
                 int bufs = info->nrbufs;
@@ -200,7 +200,7 @@ pipe_readv(struct file *filp, const struct iovec *_iov,
                 }
                 pipe_wait(inode);
         }
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
         /* Signal writers asynchronously that there is more room.  */
         if (do_wakeup) {
                 wake_up_interruptible(PIPE_WAIT(*inode));
@@ -237,7 +237,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
 
         do_wakeup = 0;
         ret = 0;
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         info = inode->i_pipe;
 
         if (!PIPE_READERS(*inode)) {
@@ -341,7 +341,7 @@ pipe_writev(struct file *filp, const struct iovec *_iov,
                 PIPE_WAITING_WRITERS(*inode)--;
         }
 out:
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
         if (do_wakeup) {
                 wake_up_interruptible(PIPE_WAIT(*inode));
                 kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);
@@ -381,7 +381,7 @@ pipe_ioctl(struct inode *pino, struct file *filp,
 
         switch (cmd) {
                 case FIONREAD:
-                        down(PIPE_SEM(*inode));
+                        mutex_lock(PIPE_MUTEX(*inode));
                         info =  inode->i_pipe;
                         count = 0;
                         buf = info->curbuf;
@@ -390,7 +390,7 @@ pipe_ioctl(struct inode *pino, struct file *filp,
                                 count += info->bufs[buf].len;
                                 buf = (buf+1) & (PIPE_BUFFERS-1);
                         }
-                        up(PIPE_SEM(*inode));
+                        mutex_unlock(PIPE_MUTEX(*inode));
                         return put_user(count, (int __user *)arg);
                 default:
                         return -EINVAL;
@@ -433,7 +433,7 @@ pipe_poll(struct file *filp, poll_table *wait)
 static int
 pipe_release(struct inode *inode, int decr, int decw)
 {
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         PIPE_READERS(*inode) -= decr;
         PIPE_WRITERS(*inode) -= decw;
         if (!PIPE_READERS(*inode) && !PIPE_WRITERS(*inode)) {
@@ -443,7 +443,7 @@ pipe_release(struct inode *inode, int decr, int decw)
                 kill_fasync(PIPE_FASYNC_READERS(*inode), SIGIO, POLL_IN);
                 kill_fasync(PIPE_FASYNC_WRITERS(*inode), SIGIO, POLL_OUT);
         }
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         return 0;
 }
@@ -454,9 +454,9 @@ pipe_read_fasync(int fd, struct file *filp, int on)
         struct inode *inode = filp->f_dentry->d_inode;
         int retval;
 
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         retval = fasync_helper(fd, filp, on, PIPE_FASYNC_READERS(*inode));
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         if (retval < 0)
                 return retval;
@@ -471,9 +471,9 @@ pipe_write_fasync(int fd, struct file *filp, int on)
         struct inode *inode = filp->f_dentry->d_inode;
         int retval;
 
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         retval = fasync_helper(fd, filp, on, PIPE_FASYNC_WRITERS(*inode));
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         if (retval < 0)
                 return retval;
@@ -488,14 +488,14 @@ pipe_rdwr_fasync(int fd, struct file *filp, int on)
         struct inode *inode = filp->f_dentry->d_inode;
         int retval;
 
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
 
         retval = fasync_helper(fd, filp, on, PIPE_FASYNC_READERS(*inode));
 
         if (retval >= 0)
                 retval = fasync_helper(fd, filp, on, PIPE_FASYNC_WRITERS(*inode));
 
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         if (retval < 0)
                 return retval;
@@ -534,9 +534,9 @@ pipe_read_open(struct inode *inode, struct file *filp)
 {
         /* We could have perhaps used atomic_t, but this and friends
            below are the only places.  So it doesn't seem worthwhile.  */
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         PIPE_READERS(*inode)++;
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         return 0;
 }
@@ -544,9 +544,9 @@ pipe_read_open(struct inode *inode, struct file *filp)
 static int
 pipe_write_open(struct inode *inode, struct file *filp)
 {
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         PIPE_WRITERS(*inode)++;
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         return 0;
 }
@@ -554,12 +554,12 @@ pipe_write_open(struct inode *inode, struct file *filp)
 static int
 pipe_rdwr_open(struct inode *inode, struct file *filp)
 {
-        down(PIPE_SEM(*inode));
+        mutex_lock(PIPE_MUTEX(*inode));
         if (filp->f_mode & FMODE_READ)
                 PIPE_READERS(*inode)++;
         if (filp->f_mode & FMODE_WRITE)
                 PIPE_WRITERS(*inode)++;
-        up(PIPE_SEM(*inode));
+        mutex_unlock(PIPE_MUTEX(*inode));
 
         return 0;
 }
diff --git a/fs/quota.c b/fs/quota.c
index 612e04db4b93..d14d872646d4 100644
--- a/fs/quota.c
+++ b/fs/quota.c
@@ -168,7 +168,7 @@ static void quota_sync_sb(struct super_block *sb, int type)
         sync_blockdev(sb->s_bdev);
 
         /* Now when everything is written we can discard the pagecache so
-         * that userspace sees the changes. We need i_sem and so we could
+         * that userspace sees the changes. We need i_mutex and so we could
          * not do it inside dqonoff_sem. Moreover we need to be carefull
          * about races with quotaoff() (that is the reason why we have own
          * reference to inode). */
@@ -184,9 +184,9 @@ static void quota_sync_sb(struct super_block *sb, int type)
         up(&sb_dqopt(sb)->dqonoff_sem);
         for (cnt = 0; cnt < MAXQUOTAS; cnt++) {
                 if (discard[cnt]) {
-                        down(&discard[cnt]->i_sem);
+                        mutex_lock(&discard[cnt]->i_mutex);
                         truncate_inode_pages(&discard[cnt]->i_data, 0);
-                        up(&discard[cnt]->i_sem);
+                        mutex_unlock(&discard[cnt]->i_mutex);
                         iput(discard[cnt]);
                 }
         }
diff --git a/fs/read_write.c b/fs/read_write.c
index df3468a22fea..3f7a1a62165f 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -33,7 +33,7 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin)
         long long retval;
         struct inode *inode = file->f_mapping->host;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         switch (origin) {
                 case 2:
                         offset += inode->i_size;
@@ -49,7 +49,7 @@ loff_t generic_file_llseek(struct file *file, loff_t offset, int origin)
                 }
                 retval = offset;
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return retval;
 }
 
diff --git a/fs/readdir.c b/fs/readdir.c
index b03579bc0210..b6109329b607 100644
--- a/fs/readdir.c
+++ b/fs/readdir.c
@@ -30,13 +30,13 @@ int vfs_readdir(struct file *file, filldir_t filler, void *buf)
         if (res)
                 goto out;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         res = -ENOENT;
         if (!IS_DEADDIR(inode)) {
                 res = file->f_op->readdir(file, buf, filler);
                 file_accessed(file);
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 out:
         return res;
 }
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index 7892a865b58a..127e7d2cabdd 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -49,7 +49,7 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp)
         }
 
         reiserfs_write_lock(inode->i_sb);
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         /* freeing preallocation only involves relogging blocks that
          * are already in the current transaction.  preallocation gets
          * freed at the end of each transaction, so it is impossible for
@@ -100,7 +100,7 @@ static int reiserfs_file_release(struct inode *inode, struct file *filp)
                 err = reiserfs_truncate_file(inode, 0);
         }
       out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         reiserfs_write_unlock(inode->i_sb);
         return err;
 }
@@ -1342,7 +1342,7 @@ static ssize_t reiserfs_file_write(struct file *file,	/* the file we are going t
         if (unlikely(!access_ok(VERIFY_READ, buf, count)))
                 return -EFAULT;
 
-        down(&inode->i_sem);    // locks the entire file for just us
+        mutex_lock(&inode->i_mutex);    // locks the entire file for just us
 
         pos = *ppos;
 
@@ -1532,12 +1532,12 @@ static ssize_t reiserfs_file_write(struct file *file,	/* the file we are going t
                     generic_osync_inode(inode, file->f_mapping,
                                         OSYNC_METADATA | OSYNC_DATA);
 
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         reiserfs_async_progress_wait(inode->i_sb);
         return (already_written != 0) ? already_written : res;
 
       out:
-        up(&inode->i_sem);      // unlock the file on exit.
+        mutex_unlock(&inode->i_mutex);  // unlock the file on exit.
         return res;
 }
 
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index a5e3a0ddbe53..ffa34b861bdb 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -40,12 +40,12 @@ void reiserfs_delete_inode(struct inode *inode)
 
         /* The = 0 happens when we abort creating a new inode for some reason like lack of space.. */
         if (!(inode->i_state & I_NEW) && INODE_PKEY(inode)->k_objectid != 0) {  /* also handles bad_inode case */
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
 
                 reiserfs_delete_xattrs(inode);
 
                 if (journal_begin(&th, inode->i_sb, jbegin_count)) {
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
                         goto out;
                 }
                 reiserfs_update_inode_transaction(inode);
@@ -59,11 +59,11 @@ void reiserfs_delete_inode(struct inode *inode)
                         DQUOT_FREE_INODE(inode);
 
                 if (journal_end(&th, inode->i_sb, jbegin_count)) {
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
                         goto out;
                 }
 
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
 
                 /* check return value from reiserfs_delete_object after
                  * ending the transaction
@@ -551,7 +551,7 @@ static int convert_tail_for_hole(struct inode *inode,
 
         /* we don't have to make sure the conversion did not happen while
          ** we were locking the page because anyone that could convert
-         ** must first take i_sem.
+         ** must first take i_mutex.
          **
          ** We must fix the tail page for writing because it might have buffers
          ** that are mapped, but have a block number of 0.  This indicates tail
@@ -586,7 +586,7 @@ static inline int _allocate_block(struct reiserfs_transaction_handle *th,
         BUG_ON(!th->t_trans_id);
 
 #ifdef REISERFS_PREALLOCATE
-        if (!(flags & GET_BLOCK_NO_ISEM)) {
+        if (!(flags & GET_BLOCK_NO_IMUX)) {
                 return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr,
                                                   path, block);
         }
@@ -2318,7 +2318,7 @@ static int map_block_for_writepage(struct inode *inode,
         /* this is where we fill in holes in the file. */
         if (use_get_block) {
                 retval = reiserfs_get_block(inode, block, bh_result,
-                                            GET_BLOCK_CREATE | GET_BLOCK_NO_ISEM
+                                            GET_BLOCK_CREATE | GET_BLOCK_NO_IMUX
                                             | GET_BLOCK_NO_DANGLE);
                 if (!retval) {
                         if (!buffer_mapped(bh_result)
diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
index 81fc00285f60..ba8bf8df6dc7 100644
--- a/fs/reiserfs/ioctl.c
+++ b/fs/reiserfs/ioctl.c
@@ -120,7 +120,7 @@ static int reiserfs_unpack(struct inode *inode, struct file *filp)
         /* we need to make sure nobody is changing the file size beneath
          ** us
          */
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 
         write_from = inode->i_size & (blocksize - 1);
         /* if we are on a block boundary, we are already unpacked.  */
@@ -156,7 +156,7 @@ static int reiserfs_unpack(struct inode *inode, struct file *filp)
         page_cache_release(page);
 
       out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         reiserfs_write_unlock(inode->i_sb);
         return retval;
 }
diff --git a/fs/reiserfs/super.c b/fs/reiserfs/super.c
index 42afb5bef111..397d9590c8f2 100644
--- a/fs/reiserfs/super.c
+++ b/fs/reiserfs/super.c
@@ -2211,7 +2211,7 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
         size_t towrite = len;
         struct buffer_head tmp_bh, *bh;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         while (towrite > 0) {
                 tocopy = sb->s_blocksize - offset < towrite ?
                     sb->s_blocksize - offset : towrite;
@@ -2250,7 +2250,7 @@ static ssize_t reiserfs_quota_write(struct super_block *sb, int type,
         inode->i_version++;
         inode->i_mtime = inode->i_ctime = CURRENT_TIME;
         mark_inode_dirty(inode);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return len - towrite;
 }
 
diff --git a/fs/reiserfs/tail_conversion.c b/fs/reiserfs/tail_conversion.c
index c92e124f628e..196e971c03c9 100644
--- a/fs/reiserfs/tail_conversion.c
+++ b/fs/reiserfs/tail_conversion.c
@@ -205,7 +205,7 @@ int indirect2direct(struct reiserfs_transaction_handle *th, struct inode *p_s_in
                                          1) * p_s_sb->s_blocksize;
         pos1 = pos;
 
-        // we are protected by i_sem. The tail can not disapper, not
+        // we are protected by i_mutex. The tail can not disapper, not
         // append can be done either
         // we are in truncate or packing tail in file_release
 
diff --git a/fs/reiserfs/xattr.c b/fs/reiserfs/xattr.c
index 02091eaac0b4..f1895f0a278e 100644
--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -67,11 +67,11 @@ static struct dentry *create_xa_root(struct super_block *sb)
                 goto out;
         } else if (!xaroot->d_inode) {
                 int err;
-                down(&privroot->d_inode->i_sem);
+                mutex_lock(&privroot->d_inode->i_mutex);
                 err =
                     privroot->d_inode->i_op->mkdir(privroot->d_inode, xaroot,
                                                    0700);
-                up(&privroot->d_inode->i_sem);
+                mutex_unlock(&privroot->d_inode->i_mutex);
 
                 if (err) {
                         dput(xaroot);
@@ -219,7 +219,7 @@ static struct dentry *get_xa_file_dentry(const struct inode *inode,
         } else if (flags & XATTR_REPLACE || flags & FL_READONLY) {
                 goto out;
         } else {
-                /* inode->i_sem is down, so nothing else can try to create
+                /* inode->i_mutex is down, so nothing else can try to create
                  * the same xattr */
                 err = xadir->d_inode->i_op->create(xadir->d_inode, xafile,
                                                    0700 | S_IFREG, NULL);
@@ -268,7 +268,7 @@ static struct file *open_xa_file(const struct inode *inode, const char *name,
  * and don't mess with f->f_pos, but the idea is the same.  Do some
  * action on each and every entry in the directory.
  *
- * we're called with i_sem held, so there are no worries about the directory
+ * we're called with i_mutex held, so there are no worries about the directory
  * changing underneath us.
  */
 static int __xattr_readdir(struct file *filp, void *dirent, filldir_t filldir)
@@ -426,7 +426,7 @@ int xattr_readdir(struct file *file, filldir_t filler, void *buf)
         int res = -ENOTDIR;
         if (!file->f_op || !file->f_op->readdir)
                 goto out;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 //        down(&inode->i_zombie);
         res = -ENOENT;
         if (!IS_DEADDIR(inode)) {
@@ -435,7 +435,7 @@ int xattr_readdir(struct file *file, filldir_t filler, void *buf)
                 unlock_kernel();
         }
 //        up(&inode->i_zombie);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
       out:
         return res;
 }
@@ -480,7 +480,7 @@ static inline __u32 xattr_hash(const char *msg, int len)
 /* Generic extended attribute operations that can be used by xa plugins */
 
 /*
- * inode->i_sem: down
+ * inode->i_mutex: down
  */
 int
 reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
@@ -535,7 +535,7 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
         /* Resize it so we're ok to write there */
         newattrs.ia_size = buffer_size;
         newattrs.ia_valid = ATTR_SIZE | ATTR_CTIME;
-        down(&xinode->i_sem);
+        mutex_lock(&xinode->i_mutex);
         err = notify_change(fp->f_dentry, &newattrs);
         if (err)
                 goto out_filp;
@@ -598,7 +598,7 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
         }
 
       out_filp:
-        up(&xinode->i_sem);
+        mutex_unlock(&xinode->i_mutex);
         fput(fp);
 
       out:
@@ -606,7 +606,7 @@ reiserfs_xattr_set(struct inode *inode, const char *name, const void *buffer,
 }
 
 /*
- * inode->i_sem: down
+ * inode->i_mutex: down
  */
 int
 reiserfs_xattr_get(const struct inode *inode, const char *name, void *buffer,
@@ -793,7 +793,7 @@ reiserfs_delete_xattrs_filler(void *buf, const char *name, int namelen,
 
 }
 
-/* This is called w/ inode->i_sem downed */
+/* This is called w/ inode->i_mutex downed */
 int reiserfs_delete_xattrs(struct inode *inode)
 {
         struct file *fp;
@@ -946,7 +946,7 @@ int reiserfs_chown_xattrs(struct inode *inode, struct iattr *attrs)
 
 /*
  * Inode operation getxattr()
- * Preliminary locking: we down dentry->d_inode->i_sem
+ * Preliminary locking: we down dentry->d_inode->i_mutex
  */
 ssize_t
 reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
@@ -970,7 +970,7 @@ reiserfs_getxattr(struct dentry * dentry, const char *name, void *buffer,
 /*
  * Inode operation setxattr()
  *
- * dentry->d_inode->i_sem down
+ * dentry->d_inode->i_mutex down
  */
 int
 reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
@@ -1008,7 +1008,7 @@ reiserfs_setxattr(struct dentry *dentry, const char *name, const void *value,
 /*
  * Inode operation removexattr()
  *
- * dentry->d_inode->i_sem down
+ * dentry->d_inode->i_mutex down
  */
 int reiserfs_removexattr(struct dentry *dentry, const char *name)
 {
@@ -1091,7 +1091,7 @@ reiserfs_listxattr_filler(void *buf, const char *name, int namelen,
 /*
  * Inode operation listxattr()
  *
- * Preliminary locking: we down dentry->d_inode->i_sem
+ * Preliminary locking: we down dentry->d_inode->i_mutex
  */
 ssize_t reiserfs_listxattr(struct dentry * dentry, char *buffer, size_t size)
 {
@@ -1289,9 +1289,9 @@ int reiserfs_xattr_init(struct super_block *s, int mount_flags)
                 if (!IS_ERR(dentry)) {
                         if (!(mount_flags & MS_RDONLY) && !dentry->d_inode) {
                                 struct inode *inode = dentry->d_parent->d_inode;
-                                down(&inode->i_sem);
+                                mutex_lock(&inode->i_mutex);
                                 err = inode->i_op->mkdir(inode, dentry, 0700);
-                                up(&inode->i_sem);
+                                mutex_unlock(&inode->i_mutex);
                                 if (err) {
                                         dput(dentry);
                                         dentry = NULL;
diff --git a/fs/reiserfs/xattr_acl.c b/fs/reiserfs/xattr_acl.c
index a47ac9aac8b2..2dc953504cc0 100644
--- a/fs/reiserfs/xattr_acl.c
+++ b/fs/reiserfs/xattr_acl.c
@@ -174,7 +174,7 @@ static void *posix_acl_to_disk(const struct posix_acl *acl, size_t * size)
 /*
  * Inode operation get_posix_acl().
  *
- * inode->i_sem: down
+ * inode->i_mutex: down
  * BKL held [before 2.5.x]
  */
 struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
@@ -237,7 +237,7 @@ struct posix_acl *reiserfs_get_acl(struct inode *inode, int type)
 /*
  * Inode operation set_posix_acl().
  *
- * inode->i_sem: down
+ * inode->i_mutex: down
  * BKL held [before 2.5.x]
  */
 static int
@@ -312,7 +312,7 @@ reiserfs_set_acl(struct inode *inode, int type, struct posix_acl *acl)
         return error;
 }
 
-/* dir->i_sem: down,
+/* dir->i_mutex: locked,
  * inode is new and not released into the wild yet */
 int
 reiserfs_inherit_default_acl(struct inode *dir, struct dentry *dentry,
diff --git a/fs/relayfs/inode.c b/fs/relayfs/inode.c
index 7b7f2cb5f0e1..383523011aad 100644
--- a/fs/relayfs/inode.c
+++ b/fs/relayfs/inode.c
@@ -109,7 +109,7 @@ static struct dentry *relayfs_create_entry(const char *name,
         }
 
         parent = dget(parent);
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         d = lookup_one_len(name, parent, strlen(name));
         if (IS_ERR(d)) {
                 d = NULL;
@@ -139,7 +139,7 @@ release_mount:
         simple_release_fs(&relayfs_mount, &relayfs_mount_count);
 
 exit:
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         dput(parent);
         return d;
 }
@@ -204,7 +204,7 @@ int relayfs_remove(struct dentry *dentry)
                 return -EINVAL;
 
         parent = dget(parent);
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         if (dentry->d_inode) {
                 if (S_ISDIR(dentry->d_inode->i_mode))
                         error = simple_rmdir(parent->d_inode, dentry);
@@ -215,7 +215,7 @@ int relayfs_remove(struct dentry *dentry)
         }
         if (!error)
                 dput(dentry);
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         dput(parent);
 
         if (!error)
@@ -476,7 +476,7 @@ static ssize_t relay_file_read(struct file *filp,
         ssize_t ret = 0;
         void *from;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if(!relay_file_read_avail(buf, *ppos))
                 goto out;
 
@@ -494,7 +494,7 @@ static ssize_t relay_file_read(struct file *filp,
         relay_file_read_consume(buf, read_start, count);
         *ppos = relay_file_read_end_pos(buf, read_start, count);
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return ret;
 }
 
diff --git a/fs/super.c b/fs/super.c
index 0a30e51692cf..c177b92419c5 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -72,7 +72,7 @@ static struct super_block *alloc_super(void)
                 INIT_HLIST_HEAD(&s->s_anon);
                 INIT_LIST_HEAD(&s->s_inodes);
                 init_rwsem(&s->s_umount);
-                sema_init(&s->s_lock, 1);
+                mutex_init(&s->s_lock);
                 down_write(&s->s_umount);
                 s->s_count = S_BIAS;
                 atomic_set(&s->s_active, 1);
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index d36780382176..49bd219275db 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -99,7 +99,7 @@ static int create_dir(struct kobject * k, struct dentry * p,
         int error;
         umode_t mode = S_IFDIR| S_IRWXU | S_IRUGO | S_IXUGO;
 
-        down(&p->d_inode->i_sem);
+        mutex_lock(&p->d_inode->i_mutex);
         *d = lookup_one_len(n, p, strlen(n));
         if (!IS_ERR(*d)) {
                 error = sysfs_make_dirent(p->d_fsdata, *d, k, mode, SYSFS_DIR);
@@ -122,7 +122,7 @@ static int create_dir(struct kobject * k, struct dentry * p,
                 dput(*d);
         } else
                 error = PTR_ERR(*d);
-        up(&p->d_inode->i_sem);
+        mutex_unlock(&p->d_inode->i_mutex);
         return error;
 }
 
@@ -246,7 +246,7 @@ static void remove_dir(struct dentry * d)
         struct dentry * parent = dget(d->d_parent);
         struct sysfs_dirent * sd;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         d_delete(d);
         sd = d->d_fsdata;
         list_del_init(&sd->s_sibling);
@@ -257,7 +257,7 @@ static void remove_dir(struct dentry * d)
         pr_debug(" o %s removing done (%d)\n",d->d_name.name,
                  atomic_read(&d->d_count));
 
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         dput(parent);
 }
 
@@ -286,7 +286,7 @@ void sysfs_remove_dir(struct kobject * kobj)
                 return;
 
         pr_debug("sysfs %s: removing dir\n",dentry->d_name.name);
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         parent_sd = dentry->d_fsdata;
         list_for_each_entry_safe(sd, tmp, &parent_sd->s_children, s_sibling) {
                 if (!sd->s_element || !(sd->s_type & SYSFS_NOT_PINNED))
@@ -295,7 +295,7 @@ void sysfs_remove_dir(struct kobject * kobj)
                 sysfs_drop_dentry(sd, dentry);
                 sysfs_put(sd);
         }
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         remove_dir(dentry);
         /**
@@ -318,7 +318,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
         down_write(&sysfs_rename_sem);
         parent = kobj->parent->dentry;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
 
         new_dentry = lookup_one_len(new_name, parent, strlen(new_name));
         if (!IS_ERR(new_dentry)) {
@@ -334,7 +334,7 @@ int sysfs_rename_dir(struct kobject * kobj, const char *new_name)
                         error = -EEXIST;
                 dput(new_dentry);
         }
-        up(&parent->d_inode->i_sem);    
+        mutex_unlock(&parent->d_inode->i_mutex);
         up_write(&sysfs_rename_sem);
 
         return error;
@@ -345,9 +345,9 @@ static int sysfs_dir_open(struct inode *inode, struct file *file)
         struct dentry * dentry = file->f_dentry;
         struct sysfs_dirent * parent_sd = dentry->d_fsdata;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         file->private_data = sysfs_new_dirent(parent_sd, NULL);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         return file->private_data ? 0 : -ENOMEM;
 
@@ -358,9 +358,9 @@ static int sysfs_dir_close(struct inode *inode, struct file *file)
         struct dentry * dentry = file->f_dentry;
         struct sysfs_dirent * cursor = file->private_data;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         list_del_init(&cursor->s_sibling);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
 
         release_sysfs_dirent(cursor);
 
@@ -436,7 +436,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
 {
         struct dentry * dentry = file->f_dentry;
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         switch (origin) {
                 case 1:
                         offset += file->f_pos;
@@ -444,7 +444,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
                         if (offset >= 0)
                                 break;
                 default:
-                        up(&file->f_dentry->d_inode->i_sem);
+                        mutex_unlock(&file->f_dentry->d_inode->i_mutex);
                         return -EINVAL;
         }
         if (offset != file->f_pos) {
@@ -468,7 +468,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
                         list_add_tail(&cursor->s_sibling, p);
                 }
         }
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         return offset;
 }
 
@@ -483,4 +483,3 @@ struct file_operations sysfs_dir_operations = {
 EXPORT_SYMBOL_GPL(sysfs_create_dir);
 EXPORT_SYMBOL_GPL(sysfs_remove_dir);
 EXPORT_SYMBOL_GPL(sysfs_rename_dir);
-
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 4013d7905e84..d0e3d8495165 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -364,9 +364,9 @@ int sysfs_add_file(struct dentry * dir, const struct attribute * attr, int type)
         umode_t mode = (attr->mode & S_IALLUGO) | S_IFREG;
         int error = 0;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         error = sysfs_make_dirent(parent_sd, NULL, (void *) attr, mode, type);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         return error;
 }
@@ -398,7 +398,7 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
         struct dentry * victim;
         int res = -ENOENT;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         victim = lookup_one_len(attr->name, dir, strlen(attr->name));
         if (!IS_ERR(victim)) {
                 /* make sure dentry is really there */
@@ -420,7 +420,7 @@ int sysfs_update_file(struct kobject * kobj, const struct attribute * attr)
                  */
                 dput(victim);
         }
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         return res;
 }
@@ -441,22 +441,22 @@ int sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode)
         struct iattr newattrs;
         int res = -ENOENT;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         victim = lookup_one_len(attr->name, dir, strlen(attr->name));
         if (!IS_ERR(victim)) {
                 if (victim->d_inode &&
                     (victim->d_parent->d_inode == dir->d_inode)) {
                         inode = victim->d_inode;
-                        down(&inode->i_sem);
+                        mutex_lock(&inode->i_mutex);
                         newattrs.ia_mode = (mode & S_IALLUGO) |
                                                 (inode->i_mode & ~S_IALLUGO);
                         newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
                         res = notify_change(victim, &newattrs);
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
                 }
                 dput(victim);
         }
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 
         return res;
 }
@@ -480,4 +480,3 @@ void sysfs_remove_file(struct kobject * kobj, const struct attribute * attr)
 EXPORT_SYMBOL_GPL(sysfs_create_file);
 EXPORT_SYMBOL_GPL(sysfs_remove_file);
 EXPORT_SYMBOL_GPL(sysfs_update_file);
-
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c
index 970a33f03299..c3133219941c 100644
--- a/fs/sysfs/inode.c
+++ b/fs/sysfs/inode.c
@@ -201,7 +201,7 @@ const unsigned char * sysfs_get_name(struct sysfs_dirent *sd)
 
 /*
  * Unhashes the dentry corresponding to given sysfs_dirent
- * Called with parent inode's i_sem held.
+ * Called with parent inode's i_mutex held.
  */
 void sysfs_drop_dentry(struct sysfs_dirent * sd, struct dentry * parent)
 {
@@ -232,7 +232,7 @@ void sysfs_hash_and_remove(struct dentry * dir, const char * name)
                 /* no inode means this hasn't been made visible yet */
                 return;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         list_for_each_entry(sd, &parent_sd->s_children, s_sibling) {
                 if (!sd->s_element)
                         continue;
@@ -243,7 +243,5 @@ void sysfs_hash_and_remove(struct dentry * dir, const char * name)
                         break;
                 }
         }
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
 }
-
-
diff --git a/fs/sysfs/symlink.c b/fs/sysfs/symlink.c
index de402fa915f2..e38d6338a20d 100644
--- a/fs/sysfs/symlink.c
+++ b/fs/sysfs/symlink.c
@@ -86,9 +86,9 @@ int sysfs_create_link(struct kobject * kobj, struct kobject * target, const char
 
         BUG_ON(!kobj || !kobj->dentry || !name);
 
-        down(&dentry->d_inode->i_sem);
+        mutex_lock(&dentry->d_inode->i_mutex);
         error = sysfs_add_link(dentry, name, target);
-        up(&dentry->d_inode->i_sem);
+        mutex_unlock(&dentry->d_inode->i_mutex);
         return error;
 }
 
@@ -177,4 +177,3 @@ struct inode_operations sysfs_symlink_inode_operations = {
 
 EXPORT_SYMBOL_GPL(sysfs_create_link);
 EXPORT_SYMBOL_GPL(sysfs_remove_link);
-
diff --git a/fs/ufs/super.c b/fs/ufs/super.c
index 2ba11a9aa995..e9a42c711a9e 100644
--- a/fs/ufs/super.c
+++ b/fs/ufs/super.c
@@ -1275,7 +1275,7 @@ static ssize_t ufs_quota_write(struct super_block *sb, int type,
         size_t towrite = len;
         struct buffer_head *bh;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         while (towrite > 0) {
                 tocopy = sb->s_blocksize - offset < towrite ?
                                 sb->s_blocksize - offset : towrite;
@@ -1297,7 +1297,7 @@ static ssize_t ufs_quota_write(struct super_block *sb, int type,
         }
 out:
         if (len == towrite) {
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
                 return err;
         }
         if (inode->i_size < off+len-towrite)
@@ -1305,7 +1305,7 @@ out:
         inode->i_version++;
         inode->i_mtime = inode->i_ctime = CURRENT_TIME_SEC;
         mark_inode_dirty(inode);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return len - towrite;
 }
 
diff --git a/fs/xattr.c b/fs/xattr.c
index bcc2156d4d28..386a532ee5a9 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -51,7 +51,7 @@ setxattr(struct dentry *d, char __user *name, void __user *value,
                 }
         }
 
-        down(&d->d_inode->i_sem);
+        mutex_lock(&d->d_inode->i_mutex);
         error = security_inode_setxattr(d, kname, kvalue, size, flags);
         if (error)
                 goto out;
@@ -73,7 +73,7 @@ setxattr(struct dentry *d, char __user *name, void __user *value,
                         fsnotify_xattr(d);
         }
 out:
-        up(&d->d_inode->i_sem);
+        mutex_unlock(&d->d_inode->i_mutex);
         kfree(kvalue);
         return error;
 }
@@ -323,9 +323,9 @@ removexattr(struct dentry *d, char __user *name)
                 error = security_inode_removexattr(d, kname);
                 if (error)
                         goto out;
-                down(&d->d_inode->i_sem);
+                mutex_lock(&d->d_inode->i_mutex);
                 error = d->d_inode->i_op->removexattr(d, kname);
-                up(&d->d_inode->i_sem);
+                mutex_unlock(&d->d_inode->i_mutex);
                 if (!error)
                         fsnotify_xattr(d);
         }
diff --git a/fs/xfs/linux-2.6/mutex.h b/fs/xfs/linux-2.6/mutex.h
index ce773d89a923..d3369b6ca168 100644
--- a/fs/xfs/linux-2.6/mutex.h
+++ b/fs/xfs/linux-2.6/mutex.h
@@ -19,7 +19,7 @@
 #define __XFS_SUPPORT_MUTEX_H__
 
 #include <linux/spinlock.h>
-#include <asm/semaphore.h>
+#include <linux/mutex.h>
 
 /*
  * Map the mutex'es from IRIX to Linux semaphores.
@@ -28,12 +28,8 @@
  * callers.
  */
 #define MUTEX_DEFAULT           0x0
-typedef struct semaphore        mutex_t;
 
-#define mutex_init(lock, type, name)            sema_init(lock, 1)
-#define mutex_destroy(lock)                     sema_init(lock, -99)
-#define mutex_lock(lock, num)                   down(lock)
-#define mutex_trylock(lock)                     (down_trylock(lock) ? 0 : 1)
-#define mutex_unlock(lock)                      up(lock)
+typedef struct mutex            mutex_t;
+//#define mutex_destroy(lock)                   do{}while(0)
 
 #endif /* __XFS_SUPPORT_MUTEX_H__ */
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index 14215a7db59f..41c478bb1ffc 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -203,7 +203,7 @@ validate_fields(
                 ip->i_nlink = va.va_nlink;
                 ip->i_blocks = va.va_nblocks;
 
-                /* we're under i_sem so i_size can't change under us */
+                /* we're under i_mutex so i_size can't change under us */
                 if (i_size_read(ip) != va.va_size)
                         i_size_write(ip, va.va_size);
         }
diff --git a/fs/xfs/linux-2.6/xfs_lrw.c b/fs/xfs/linux-2.6/xfs_lrw.c
index 279e9bc92aba..5675117ef227 100644
--- a/fs/xfs/linux-2.6/xfs_lrw.c
+++ b/fs/xfs/linux-2.6/xfs_lrw.c
@@ -254,7 +254,7 @@ xfs_read(
         }
 
         if (unlikely(ioflags & IO_ISDIRECT))
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
         xfs_ilock(ip, XFS_IOLOCK_SHARED);
 
         if (DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ) &&
@@ -286,7 +286,7 @@ xfs_read(
 
 unlock_isem:
         if (unlikely(ioflags & IO_ISDIRECT))
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         return ret;
 }
 
@@ -655,7 +655,7 @@ relock:
                 iolock = XFS_IOLOCK_EXCL;
                 locktype = VRWLOCK_WRITE;
 
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
         } else {
                 iolock = XFS_IOLOCK_SHARED;
                 locktype = VRWLOCK_WRITE_DIRECT;
@@ -686,7 +686,7 @@ start:
                 int             dmflags = FILP_DELAY_FLAG(file);
 
                 if (need_isem)
-                        dmflags |= DM_FLAGS_ISEM;
+                        dmflags |= DM_FLAGS_IMUX;
 
                 xfs_iunlock(xip, XFS_ILOCK_EXCL);
                 error = XFS_SEND_DATA(xip->i_mount, DM_EVENT_WRITE, vp,
@@ -772,7 +772,7 @@ retry:
                 if (need_isem) {
                         /* demote the lock now the cached pages are gone */
                         XFS_ILOCK_DEMOTE(mp, io, XFS_IOLOCK_EXCL);
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
 
                         iolock = XFS_IOLOCK_SHARED;
                         locktype = VRWLOCK_WRITE_DIRECT;
@@ -817,14 +817,14 @@ retry:
 
                 xfs_rwunlock(bdp, locktype);
                 if (need_isem)
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
                 error = XFS_SEND_NAMESP(xip->i_mount, DM_EVENT_NOSPACE, vp,
                                 DM_RIGHT_NULL, vp, DM_RIGHT_NULL, NULL, NULL,
                                 0, 0, 0); /* Delay flag intentionally  unused */
                 if (error)
                         goto out_nounlocks;
                 if (need_isem)
-                        down(&inode->i_sem);
+                        mutex_lock(&inode->i_mutex);
                 xfs_rwlock(bdp, locktype);
                 pos = xip->i_d.di_size;
                 ret = 0;
@@ -926,7 +926,7 @@ retry:
         
                 xfs_rwunlock(bdp, locktype);
                 if (need_isem)
-                        up(&inode->i_sem);
+                        mutex_unlock(&inode->i_mutex);
 
                 error = sync_page_range(inode, mapping, pos, ret);
                 if (!error)
@@ -938,7 +938,7 @@ retry:
         xfs_rwunlock(bdp, locktype);
  out_unlock_isem:
         if (need_isem)
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
  out_nounlocks:
         return -error;
 }
diff --git a/fs/xfs/quota/xfs_dquot.c b/fs/xfs/quota/xfs_dquot.c
index 00b5043dfa5a..772ac48329ea 100644
--- a/fs/xfs/quota/xfs_dquot.c
+++ b/fs/xfs/quota/xfs_dquot.c
@@ -104,7 +104,7 @@ xfs_qm_dqinit(
          */
         if (brandnewdquot) {
                 dqp->dq_flnext = dqp->dq_flprev = dqp;
-                mutex_init(&dqp->q_qlock,  MUTEX_DEFAULT, "xdq");
+                mutex_init(&dqp->q_qlock);
                 initnsema(&dqp->q_flock, 1, "fdq");
                 sv_init(&dqp->q_pinwait, SV_DEFAULT, "pdq");
 
@@ -1382,7 +1382,7 @@ void
 xfs_dqlock(
         xfs_dquot_t *dqp)
 {
-        mutex_lock(&(dqp->q_qlock), PINOD);
+        mutex_lock(&(dqp->q_qlock));
 }
 
 void
diff --git a/fs/xfs/quota/xfs_qm.c b/fs/xfs/quota/xfs_qm.c
index 5328a2937127..bb6991a7a617 100644
--- a/fs/xfs/quota/xfs_qm.c
+++ b/fs/xfs/quota/xfs_qm.c
@@ -167,7 +167,7 @@ xfs_Gqm_init(void)
         xqm->qm_dqfree_ratio = XFS_QM_DQFREE_RATIO;
         xqm->qm_nrefs = 0;
 #ifdef DEBUG
-        mutex_init(&qcheck_lock, MUTEX_DEFAULT, "qchk");
+        xfs_mutex_init(&qcheck_lock, MUTEX_DEFAULT, "qchk");
 #endif
         return xqm;
 }
@@ -1166,7 +1166,7 @@ xfs_qm_init_quotainfo(
         qinf->qi_dqreclaims = 0;
 
         /* mutex used to serialize quotaoffs */
-        mutex_init(&qinf->qi_quotaofflock, MUTEX_DEFAULT, "qoff");
+        mutex_init(&qinf->qi_quotaofflock);
 
         /* Precalc some constants */
         qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
@@ -1285,7 +1285,7 @@ xfs_qm_list_init(
         char            *str,
         int             n)
 {
-        mutex_init(&list->qh_lock, MUTEX_DEFAULT, str);
+        mutex_init(&list->qh_lock);
         list->qh_next = NULL;
         list->qh_version = 0;
         list->qh_nelems = 0;
@@ -2762,7 +2762,7 @@ STATIC void
 xfs_qm_freelist_init(xfs_frlist_t *ql)
 {
         ql->qh_next = ql->qh_prev = (xfs_dquot_t *) ql;
-        mutex_init(&ql->qh_lock, MUTEX_DEFAULT, "dqf");
+        mutex_init(&ql->qh_lock);
         ql->qh_version = 0;
         ql->qh_nelems = 0;
 }
@@ -2772,7 +2772,7 @@ xfs_qm_freelist_destroy(xfs_frlist_t *ql)
 {
         xfs_dquot_t     *dqp, *nextdqp;
 
-        mutex_lock(&ql->qh_lock, PINOD);
+        mutex_lock(&ql->qh_lock);
         for (dqp = ql->qh_next;
              dqp != (xfs_dquot_t *)ql; ) {
                 xfs_dqlock(dqp);
diff --git a/fs/xfs/quota/xfs_qm.h b/fs/xfs/quota/xfs_qm.h
index 12da259f2fcb..4568deb6da86 100644
--- a/fs/xfs/quota/xfs_qm.h
+++ b/fs/xfs/quota/xfs_qm.h
@@ -165,7 +165,7 @@ typedef struct xfs_dquot_acct {
 #define XFS_QM_IWARNLIMIT       5
 #define XFS_QM_RTBWARNLIMIT     5
 
-#define XFS_QM_LOCK(xqm)        (mutex_lock(&xqm##_lock, PINOD))
+#define XFS_QM_LOCK(xqm)        (mutex_lock(&xqm##_lock))
 #define XFS_QM_UNLOCK(xqm)      (mutex_unlock(&xqm##_lock))
 #define XFS_QM_HOLD(xqm)        ((xqm)->qm_nrefs++)
 #define XFS_QM_RELE(xqm)        ((xqm)->qm_nrefs--)
diff --git a/fs/xfs/quota/xfs_qm_bhv.c b/fs/xfs/quota/xfs_qm_bhv.c
index d9d2993de435..90402a1c3983 100644
--- a/fs/xfs/quota/xfs_qm_bhv.c
+++ b/fs/xfs/quota/xfs_qm_bhv.c
@@ -363,7 +363,7 @@ xfs_qm_init(void)
                 KERN_INFO "SGI XFS Quota Management subsystem\n";
 
         printk(message);
-        mutex_init(&xfs_Gqm_lock, MUTEX_DEFAULT, "xfs_qmlock");
+        mutex_init(&xfs_Gqm_lock);
         vfs_bhv_set_custom(&xfs_qmops, &xfs_qmcore_xfs);
         xfs_qm_init_procfs();
 }
diff --git a/fs/xfs/quota/xfs_qm_syscalls.c b/fs/xfs/quota/xfs_qm_syscalls.c
index 24690e1af659..86a1d09f48d5 100644
--- a/fs/xfs/quota/xfs_qm_syscalls.c
+++ b/fs/xfs/quota/xfs_qm_syscalls.c
@@ -233,7 +233,7 @@ xfs_qm_scall_quotaoff(
          */
         ASSERT(mp->m_quotainfo);
         if (mp->m_quotainfo)
-                mutex_lock(&(XFS_QI_QOFFLOCK(mp)), PINOD);
+                mutex_lock(&(XFS_QI_QOFFLOCK(mp)));
 
         ASSERT(mp->m_quotainfo);
 
@@ -508,7 +508,7 @@ xfs_qm_scall_quotaon(
         /*
          * Switch on quota enforcement in core.
          */
-        mutex_lock(&(XFS_QI_QOFFLOCK(mp)), PINOD);
+        mutex_lock(&(XFS_QI_QOFFLOCK(mp)));
         mp->m_qflags |= (flags & XFS_ALL_QUOTA_ENFD);
         mutex_unlock(&(XFS_QI_QOFFLOCK(mp)));
 
@@ -617,7 +617,7 @@ xfs_qm_scall_setqlim(
          * a quotaoff from happening). (XXXThis doesn't currently happen
          * because we take the vfslock before calling xfs_qm_sysent).
          */
-        mutex_lock(&(XFS_QI_QOFFLOCK(mp)), PINOD);
+        mutex_lock(&(XFS_QI_QOFFLOCK(mp)));
 
         /*
          * Get the dquot (locked), and join it to the transaction.
@@ -1426,7 +1426,7 @@ xfs_qm_internalqcheck(
         xfs_log_force(mp, (xfs_lsn_t)0, XFS_LOG_FORCE | XFS_LOG_SYNC);
         XFS_bflush(mp->m_ddev_targp);
 
-        mutex_lock(&qcheck_lock, PINOD);
+        mutex_lock(&qcheck_lock);
         /* There should be absolutely no quota activity while this
            is going on. */
         qmtest_udqtab = kmem_zalloc(qmtest_hashmask *
diff --git a/fs/xfs/quota/xfs_quota_priv.h b/fs/xfs/quota/xfs_quota_priv.h
index 7a9f3beb818c..b7ddd04aae32 100644
--- a/fs/xfs/quota/xfs_quota_priv.h
+++ b/fs/xfs/quota/xfs_quota_priv.h
@@ -51,7 +51,7 @@
 #define XFS_QI_MPLNEXT(mp)      ((mp)->m_quotainfo->qi_dqlist.qh_next)
 #define XFS_QI_MPLNDQUOTS(mp)   ((mp)->m_quotainfo->qi_dqlist.qh_nelems)
 
-#define XQMLCK(h)                       (mutex_lock(&((h)->qh_lock), PINOD))
+#define XQMLCK(h)                       (mutex_lock(&((h)->qh_lock)))
 #define XQMUNLCK(h)                     (mutex_unlock(&((h)->qh_lock)))
 #ifdef DEBUG
 struct xfs_dqhash;
diff --git a/fs/xfs/support/uuid.c b/fs/xfs/support/uuid.c
index 70ce40914c8a..69ec4f540c3a 100644
--- a/fs/xfs/support/uuid.c
+++ b/fs/xfs/support/uuid.c
@@ -24,7 +24,7 @@ static uuid_t	*uuid_table;
 void
 uuid_init(void)
 {
-        mutex_init(&uuid_monitor, MUTEX_DEFAULT, "uuid_monitor");
+        mutex_init(&uuid_monitor);
 }
 
 /*
@@ -94,7 +94,7 @@ uuid_table_insert(uuid_t *uuid)
 {
         int     i, hole;
 
-        mutex_lock(&uuid_monitor, PVFS);
+        mutex_lock(&uuid_monitor);
         for (i = 0, hole = -1; i < uuid_table_size; i++) {
                 if (uuid_is_nil(&uuid_table[i])) {
                         hole = i;
@@ -122,7 +122,7 @@ uuid_table_remove(uuid_t *uuid)
 {
         int     i;
 
-        mutex_lock(&uuid_monitor, PVFS);
+        mutex_lock(&uuid_monitor);
         for (i = 0; i < uuid_table_size; i++) {
                 if (uuid_is_nil(&uuid_table[i]))
                         continue;
diff --git a/fs/xfs/xfs_dmapi.h b/fs/xfs/xfs_dmapi.h
index 864bf6955689..b4c7f2bc55a0 100644
--- a/fs/xfs/xfs_dmapi.h
+++ b/fs/xfs/xfs_dmapi.h
@@ -152,7 +152,7 @@ typedef enum {
 
 #define DM_FLAGS_NDELAY         0x001   /* return EAGAIN after dm_pending() */
 #define DM_FLAGS_UNWANTED       0x002   /* event not in fsys dm_eventset_t */
-#define DM_FLAGS_ISEM           0x004   /* thread holds i_sem */
+#define DM_FLAGS_IMUX           0x004   /* thread holds i_mutex */
 #define DM_FLAGS_IALLOCSEM_RD   0x010   /* thread holds i_alloc_sem rd */
 #define DM_FLAGS_IALLOCSEM_WR   0x020   /* thread holds i_alloc_sem wr */
 
@@ -161,21 +161,21 @@ typedef enum {
  */
 #if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
-                              DM_FLAGS_ISEM : 0)
-#define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
+                              DM_FLAGS_IMUX : 0)
+#define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_IMUX)
 #endif
 
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,0)) && \
     (LINUX_VERSION_CODE >= KERNEL_VERSION(2,4,22))
 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
-                              DM_FLAGS_IALLOCSEM_RD : DM_FLAGS_ISEM)
-#define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_ISEM)
+                              DM_FLAGS_IALLOCSEM_RD : DM_FLAGS_IMUX)
+#define DM_SEM_FLAG_WR  (DM_FLAGS_IALLOCSEM_WR | DM_FLAGS_IMUX)
 #endif
 
 #if LINUX_VERSION_CODE <= KERNEL_VERSION(2,4,21)
 #define DM_SEM_FLAG_RD(ioflags) (((ioflags) & IO_ISDIRECT) ? \
-                              0 : DM_FLAGS_ISEM)
-#define DM_SEM_FLAG_WR  (DM_FLAGS_ISEM)
+                              0 : DM_FLAGS_IMUX)
+#define DM_SEM_FLAG_WR  (DM_FLAGS_IMUX)
 #endif
 
 
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 541d5dd474be..303af86739bf 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -117,7 +117,7 @@ xfs_mount_init(void)
 
         AIL_LOCKINIT(&mp->m_ail_lock, "xfs_ail");
         spinlock_init(&mp->m_sb_lock, "xfs_sb");
-        mutex_init(&mp->m_ilock, MUTEX_DEFAULT, "xfs_ilock");
+        mutex_init(&mp->m_ilock);
         initnsema(&mp->m_growlock, 1, "xfs_grow");
         /*
          * Initialize the AIL.
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 08b2e0a5d807..3432fd5a3986 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -533,7 +533,7 @@ typedef struct xfs_mod_sb {
         int             msb_delta;      /* Change to make to specified field */
 } xfs_mod_sb_t;
 
-#define XFS_MOUNT_ILOCK(mp)     mutex_lock(&((mp)->m_ilock), PINOD)
+#define XFS_MOUNT_ILOCK(mp)     mutex_lock(&((mp)->m_ilock))
 #define XFS_MOUNT_IUNLOCK(mp)   mutex_unlock(&((mp)->m_ilock))
 #define XFS_SB_LOCK(mp)         mutex_spinlock(&(mp)->m_sb_lock)
 #define XFS_SB_UNLOCK(mp,s)     mutex_spinunlock(&(mp)->m_sb_lock,(s))
diff --git a/include/asm-alpha/atomic.h b/include/asm-alpha/atomic.h
index cb03bbe92cdf..fc77f7413083 100644
--- a/include/asm-alpha/atomic.h
+++ b/include/asm-alpha/atomic.h
@@ -176,6 +176,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t * v)
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-alpha/mutex.h b/include/asm-alpha/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-alpha/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-arm/atomic.h b/include/asm-arm/atomic.h
index f72b63309bc5..3d7283d84405 100644
--- a/include/asm-arm/atomic.h
+++ b/include/asm-arm/atomic.h
@@ -175,6 +175,8 @@ static inline void atomic_clear_mask(unsigned long mask, unsigned long *addr)
 
 #endif /* __LINUX_ARM_ARCH__ */
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int c, old;
diff --git a/include/asm-arm/mutex.h b/include/asm-arm/mutex.h
new file mode 100644
index 000000000000..6caa59f1f595
--- /dev/null
+++ b/include/asm-arm/mutex.h
@@ -0,0 +1,128 @@
+/*
+ * include/asm-arm/mutex.h
+ *
+ * ARM optimized mutex locking primitives
+ *
+ * Please look into asm-generic/mutex-xchg.h for a formal definition.
+ */
+#ifndef _ASM_MUTEX_H
+#define _ASM_MUTEX_H
+
+#if __LINUX_ARM_ARCH__ < 6
+/* On pre-ARMv6 hardware the swp based implementation is the most efficient. */
+# include <asm-generic/mutex-xchg.h>
+#else
+
+/*
+ * Attempting to lock a mutex on ARMv6+ can be done with a bastardized
+ * atomic decrement (it is not a reliable atomic decrement but it satisfies
+ * the defined semantics for our purpose, while being smaller and faster
+ * than a real atomic decrement or atomic swap.  The idea is to attempt
+ * decrementing the lock value only once.  If once decremented it isn't zero,
+ * or if its store-back fails due to a dispute on the exclusive store, we
+ * simply bail out immediately through the slow path where the lock will be
+ * reattempted until it succeeds.
+ */
+#define __mutex_fastpath_lock(count, fail_fn)                           \
+do {                                                                    \
+        int __ex_flag, __res;                                           \
+                                                                        \
+        typecheck(atomic_t *, count);                                   \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ (                                                       \
+                "ldrex  %0, [%2]        \n"                             \
+                "sub    %0, %0, #1      \n"                             \
+                "strex  %1, %0, [%2]    \n"                             \
+                                                                        \
+                : "=&r" (__res), "=&r" (__ex_flag)                      \
+                : "r" (&(count)->counter)                               \
+                : "cc","memory" );                                      \
+                                                                        \
+        if (unlikely(__res || __ex_flag))                               \
+                fail_fn(count);                                         \
+} while (0)
+
+#define __mutex_fastpath_lock_retval(count, fail_fn)                    \
+({                                                                      \
+        int __ex_flag, __res;                                           \
+                                                                        \
+        typecheck(atomic_t *, count);                                   \
+        typecheck_fn(fastcall int (*)(atomic_t *), fail_fn);            \
+                                                                        \
+        __asm__ (                                                       \
+                "ldrex  %0, [%2]        \n"                             \
+                "sub    %0, %0, #1      \n"                             \
+                "strex  %1, %0, [%2]    \n"                             \
+                                                                        \
+                : "=&r" (__res), "=&r" (__ex_flag)                      \
+                : "r" (&(count)->counter)                               \
+                : "cc","memory" );                                      \
+                                                                        \
+        __res |= __ex_flag;                                             \
+        if (unlikely(__res != 0))                                       \
+                __res = fail_fn(count);                                 \
+        __res;                                                          \
+})
+
+/*
+ * Same trick is used for the unlock fast path. However the original value,
+ * rather than the result, is used to test for success in order to have
+ * better generated assembly.
+ */
+#define __mutex_fastpath_unlock(count, fail_fn)                         \
+do {                                                                    \
+        int __ex_flag, __res, __orig;                                   \
+                                                                        \
+        typecheck(atomic_t *, count);                                   \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ (                                                       \
+                "ldrex  %0, [%3]        \n"                             \
+                "add    %1, %0, #1      \n"                             \
+                "strex  %2, %1, [%3]    \n"                             \
+                                                                        \
+                : "=&r" (__orig), "=&r" (__res), "=&r" (__ex_flag)      \
+                : "r" (&(count)->counter)                               \
+                : "cc","memory" );                                      \
+                                                                        \
+        if (unlikely(__orig || __ex_flag))                              \
+                fail_fn(count);                                         \
+} while (0)
+
+/*
+ * If the unlock was done on a contended lock, or if the unlock simply fails
+ * then the mutex remains locked.
+ */
+#define __mutex_slowpath_needs_to_unlock()      1
+
+/*
+ * For __mutex_fastpath_trylock we use another construct which could be
+ * described as a "single value cmpxchg".
+ *
+ * This provides the needed trylock semantics like cmpxchg would, but it is
+ * lighter and less generic than a true cmpxchg implementation.
+ */
+static inline int
+__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        int __ex_flag, __res, __orig;
+
+        __asm__ (
+
+                "1: ldrex       %0, [%3]        \n"
+                "subs           %1, %0, #1      \n"
+                "strexeq        %2, %1, [%3]    \n"
+                "movlt          %0, #0          \n"
+                "cmpeq          %2, #0          \n"
+                "bgt            1b              \n"
+
+                : "=&r" (__orig), "=&r" (__res), "=&r" (__ex_flag)
+                : "r" (&count->counter)
+                : "cc", "memory" );
+
+        return __orig;
+}
+
+#endif
+#endif
diff --git a/include/asm-arm26/atomic.h b/include/asm-arm26/atomic.h
index 3074b0e76343..1552c8653990 100644
--- a/include/asm-arm26/atomic.h
+++ b/include/asm-arm26/atomic.h
@@ -76,6 +76,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-cris/atomic.h b/include/asm-cris/atomic.h
index 2df2c7aa19b7..0b51a87e5532 100644
--- a/include/asm-cris/atomic.h
+++ b/include/asm-cris/atomic.h
@@ -136,6 +136,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-cris/mutex.h b/include/asm-cris/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-cris/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-frv/atomic.h b/include/asm-frv/atomic.h
index 9c9e9499cfd8..a59f684b4f33 100644
--- a/include/asm-frv/atomic.h
+++ b/include/asm-frv/atomic.h
@@ -328,6 +328,7 @@ extern uint32_t __cmpxchg_32(uint32_t *v, uint32_t test, uint32_t new);
 #endif
 
 #define atomic_cmpxchg(v, old, new) (cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-frv/mutex.h b/include/asm-frv/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-frv/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-generic/mutex-dec.h b/include/asm-generic/mutex-dec.h
new file mode 100644
index 000000000000..74b18cda169f
--- /dev/null
+++ b/include/asm-generic/mutex-dec.h
@@ -0,0 +1,110 @@
+/*
+ * asm-generic/mutex-dec.h
+ *
+ * Generic implementation of the mutex fastpath, based on atomic
+ * decrement/increment.
+ */
+#ifndef _ASM_GENERIC_MUTEX_DEC_H
+#define _ASM_GENERIC_MUTEX_DEC_H
+
+/**
+ *  __mutex_fastpath_lock - try to take the lock by moving the count
+ *                          from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if
+ * it wasn't 1 originally. This function MUST leave the value lower than
+ * 1 even when the "1" assertion wasn't true.
+ */
+#define __mutex_fastpath_lock(count, fail_fn)                           \
+do {                                                                    \
+        if (unlikely(atomic_dec_return(count) < 0))                     \
+                fail_fn(count);                                         \
+        else                                                            \
+                smp_mb();                                               \
+} while (0)
+
+/**
+ *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
+ *                                 from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if
+ * it wasn't 1 originally. This function returns 0 if the fastpath succeeds,
+ * or anything the slow path function returns.
+ */
+static inline int
+__mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_dec_return(count) < 0))
+                return fail_fn(count);
+        else {
+                smp_mb();
+                return 0;
+        }
+}
+
+/**
+ *  __mutex_fastpath_unlock - try to promote the count from 0 to 1
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 0
+ *
+ * Try to promote the count from 0 to 1. If it wasn't 0, call <fail_fn>.
+ * In the failure case, this function is allowed to either set the value to
+ * 1, or to set it to a value lower than 1.
+ *
+ * If the implementation sets it to a value of lower than 1, then the
+ * __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
+ * to return 0 otherwise.
+ */
+#define __mutex_fastpath_unlock(count, fail_fn)                         \
+do {                                                                    \
+        smp_mb();                                                       \
+        if (unlikely(atomic_inc_return(count) <= 0))                    \
+                fail_fn(count);                                         \
+} while (0)
+
+#define __mutex_slowpath_needs_to_unlock()              1
+
+/**
+ * __mutex_fastpath_trylock - try to acquire the mutex, without waiting
+ *
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: fallback function
+ *
+ * Change the count from 1 to a value lower than 1, and return 0 (failure)
+ * if it wasn't 1 originally, or return 1 (success) otherwise. This function
+ * MUST leave the value lower than 1 even when the "1" assertion wasn't true.
+ * Additionally, if the value was < 0 originally, this function must not leave
+ * it to 0 on failure.
+ *
+ * If the architecture has no effective trylock variant, it should call the
+ * <fail_fn> spinlock-based trylock variant unconditionally.
+ */
+static inline int
+__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        /*
+         * We have two variants here. The cmpxchg based one is the best one
+         * because it never induce a false contention state.  It is included
+         * here because architectures using the inc/dec algorithms over the
+         * xchg ones are much more likely to support cmpxchg natively.
+         *
+         * If not we fall back to the spinlock based variant - that is
+         * just as efficient (and simpler) as a 'destructive' probing of
+         * the mutex state would be.
+         */
+#ifdef __HAVE_ARCH_CMPXCHG
+        if (likely(atomic_cmpxchg(count, 1, 0)) == 1) {
+                smp_mb();
+                return 1;
+        }
+        return 0;
+#else
+        return fail_fn(count);
+#endif
+}
+
+#endif
diff --git a/include/asm-generic/mutex-null.h b/include/asm-generic/mutex-null.h
new file mode 100644
index 000000000000..5cf8b7ce0c45
--- /dev/null
+++ b/include/asm-generic/mutex-null.h
@@ -0,0 +1,24 @@
+/*
+ * asm-generic/mutex-null.h
+ *
+ * Generic implementation of the mutex fastpath, based on NOP :-)
+ *
+ * This is used by the mutex-debugging infrastructure, but it can also
+ * be used by architectures that (for whatever reason) want to use the
+ * spinlock based slowpath.
+ */
+#ifndef _ASM_GENERIC_MUTEX_NULL_H
+#define _ASM_GENERIC_MUTEX_NULL_H
+
+/* extra parameter only needed for mutex debugging: */
+#ifndef __IP__
+# define __IP__
+#endif
+
+#define __mutex_fastpath_lock(count, fail_fn)         fail_fn(count __RET_IP__)
+#define __mutex_fastpath_lock_retval(count, fail_fn)  fail_fn(count __RET_IP__)
+#define __mutex_fastpath_unlock(count, fail_fn)       fail_fn(count __RET_IP__)
+#define __mutex_fastpath_trylock(count, fail_fn)      fail_fn(count)
+#define __mutex_slowpath_needs_to_unlock()            1
+
+#endif
diff --git a/include/asm-generic/mutex-xchg.h b/include/asm-generic/mutex-xchg.h
new file mode 100644
index 000000000000..1d24f47e6c48
--- /dev/null
+++ b/include/asm-generic/mutex-xchg.h
@@ -0,0 +1,117 @@
+/*
+ * asm-generic/mutex-xchg.h
+ *
+ * Generic implementation of the mutex fastpath, based on xchg().
+ *
+ * NOTE: An xchg based implementation is less optimal than an atomic
+ *       decrement/increment based implementation. If your architecture
+ *       has a reasonable atomic dec/inc then you should probably use
+ *       asm-generic/mutex-dec.h instead, or you could open-code an
+ *       optimized version in asm/mutex.h.
+ */
+#ifndef _ASM_GENERIC_MUTEX_XCHG_H
+#define _ASM_GENERIC_MUTEX_XCHG_H
+
+/**
+ *  __mutex_fastpath_lock - try to take the lock by moving the count
+ *                          from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if it
+ * wasn't 1 originally. This function MUST leave the value lower than 1
+ * even when the "1" assertion wasn't true.
+ */
+#define __mutex_fastpath_lock(count, fail_fn)                           \
+do {                                                                    \
+        if (unlikely(atomic_xchg(count, 0) != 1))                       \
+                fail_fn(count);                                         \
+        else                                                            \
+                smp_mb();                                               \
+} while (0)
+
+
+/**
+ *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
+ *                                 from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if it
+ * wasn't 1 originally. This function returns 0 if the fastpath succeeds,
+ * or anything the slow path function returns
+ */
+static inline int
+__mutex_fastpath_lock_retval(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_xchg(count, 0) != 1))
+                return fail_fn(count);
+        else {
+                smp_mb();
+                return 0;
+        }
+}
+
+/**
+ *  __mutex_fastpath_unlock - try to promote the mutex from 0 to 1
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 0
+ *
+ * try to promote the mutex from 0 to 1. if it wasn't 0, call <function>
+ * In the failure case, this function is allowed to either set the value to
+ * 1, or to set it to a value lower than one.
+ * If the implementation sets it to a value of lower than one, the
+ * __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
+ * to return 0 otherwise.
+ */
+#define __mutex_fastpath_unlock(count, fail_fn)                         \
+do {                                                                    \
+        smp_mb();                                                       \
+        if (unlikely(atomic_xchg(count, 1) != 0))                       \
+                fail_fn(count);                                         \
+} while (0)
+
+#define __mutex_slowpath_needs_to_unlock()              0
+
+/**
+ * __mutex_fastpath_trylock - try to acquire the mutex, without waiting
+ *
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: spinlock based trylock implementation
+ *
+ * Change the count from 1 to a value lower than 1, and return 0 (failure)
+ * if it wasn't 1 originally, or return 1 (success) otherwise. This function
+ * MUST leave the value lower than 1 even when the "1" assertion wasn't true.
+ * Additionally, if the value was < 0 originally, this function must not leave
+ * it to 0 on failure.
+ *
+ * If the architecture has no effective trylock variant, it should call the
+ * <fail_fn> spinlock-based trylock variant unconditionally.
+ */
+static inline int
+__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        int prev = atomic_xchg(count, 0);
+
+        if (unlikely(prev < 0)) {
+                /*
+                 * The lock was marked contended so we must restore that
+                 * state. If while doing so we get back a prev value of 1
+                 * then we just own it.
+                 *
+                 * [ In the rare case of the mutex going to 1, to 0, to -1
+                 *   and then back to 0 in this few-instructions window,
+                 *   this has the potential to trigger the slowpath for the
+                 *   owner's unlock path needlessly, but that's not a problem
+                 *   in practice. ]
+                 */
+                prev = atomic_xchg(count, prev);
+                if (prev < 0)
+                        prev = 0;
+        }
+        smp_mb();
+
+        return prev;
+}
+
+#endif
diff --git a/include/asm-h8300/atomic.h b/include/asm-h8300/atomic.h
index d891541e89c3..21f54428c86b 100644
--- a/include/asm-h8300/atomic.h
+++ b/include/asm-h8300/atomic.h
@@ -95,6 +95,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-h8300/mutex.h b/include/asm-h8300/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-h8300/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-i386/atomic.h b/include/asm-i386/atomic.h
index 7a5472d77091..de649d3aa2d4 100644
--- a/include/asm-i386/atomic.h
+++ b/include/asm-i386/atomic.h
@@ -216,6 +216,7 @@ static __inline__ int atomic_sub_return(int i, atomic_t *v)
 }
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-i386/mutex.h b/include/asm-i386/mutex.h
new file mode 100644
index 000000000000..4e5e3de1b9a6
--- /dev/null
+++ b/include/asm-i386/mutex.h
@@ -0,0 +1,124 @@
+/*
+ * Assembly implementation of the mutex fastpath, based on atomic
+ * decrement/increment.
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#ifndef _ASM_MUTEX_H
+#define _ASM_MUTEX_H
+
+/**
+ *  __mutex_fastpath_lock - try to take the lock by moving the count
+ *                          from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fn> if it
+ * wasn't 1 originally. This function MUST leave the value lower than 1
+ * even when the "1" assertion wasn't true.
+ */
+#define __mutex_fastpath_lock(count, fail_fn)                           \
+do {                                                                    \
+        unsigned int dummy;                                             \
+                                                                        \
+        typecheck(atomic_t *, count);                                   \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ __volatile__(                                           \
+                LOCK    "   decl (%%eax)        \n"                     \
+                        "   js "#fail_fn"       \n"                     \
+                                                                        \
+                :"=a" (dummy)                                           \
+                : "a" (count)                                           \
+                : "memory", "ecx", "edx");                              \
+} while (0)
+
+
+/**
+ *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
+ *                                 from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if it
+ * wasn't 1 originally. This function returns 0 if the fastpath succeeds,
+ * or anything the slow path function returns
+ */
+static inline int
+__mutex_fastpath_lock_retval(atomic_t *count,
+                             int fastcall (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_dec_return(count) < 0))
+                return fail_fn(count);
+        else
+                return 0;
+}
+
+/**
+ *  __mutex_fastpath_unlock - try to promote the mutex from 0 to 1
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 0
+ *
+ * try to promote the mutex from 0 to 1. if it wasn't 0, call <fail_fn>.
+ * In the failure case, this function is allowed to either set the value
+ * to 1, or to set it to a value lower than 1.
+ *
+ * If the implementation sets it to a value of lower than 1, the
+ * __mutex_slowpath_needs_to_unlock() macro needs to return 1, it needs
+ * to return 0 otherwise.
+ */
+#define __mutex_fastpath_unlock(count, fail_fn)                         \
+do {                                                                    \
+        unsigned int dummy;                                             \
+                                                                        \
+        typecheck(atomic_t *, count);                                   \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ __volatile__(                                           \
+                LOCK    "   incl (%%eax)        \n"                     \
+                        "   jle "#fail_fn"      \n"                     \
+                                                                        \
+                :"=a" (dummy)                                           \
+                : "a" (count)                                           \
+                : "memory", "ecx", "edx");                              \
+} while (0)
+
+#define __mutex_slowpath_needs_to_unlock()      1
+
+/**
+ * __mutex_fastpath_trylock - try to acquire the mutex, without waiting
+ *
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: fallback function
+ *
+ * Change the count from 1 to a value lower than 1, and return 0 (failure)
+ * if it wasn't 1 originally, or return 1 (success) otherwise. This function
+ * MUST leave the value lower than 1 even when the "1" assertion wasn't true.
+ * Additionally, if the value was < 0 originally, this function must not leave
+ * it to 0 on failure.
+ */
+static inline int
+__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        /*
+         * We have two variants here. The cmpxchg based one is the best one
+         * because it never induce a false contention state.  It is included
+         * here because architectures using the inc/dec algorithms over the
+         * xchg ones are much more likely to support cmpxchg natively.
+         *
+         * If not we fall back to the spinlock based variant - that is
+         * just as efficient (and simpler) as a 'destructive' probing of
+         * the mutex state would be.
+         */
+#ifdef __HAVE_ARCH_CMPXCHG
+        if (likely(atomic_cmpxchg(count, 1, 0)) == 1)
+                return 1;
+        return 0;
+#else
+        return fail_fn(count);
+#endif
+}
+
+#endif
diff --git a/include/asm-ia64/atomic.h b/include/asm-ia64/atomic.h
index 15cf7984c48e..d3e0dfa99e1f 100644
--- a/include/asm-ia64/atomic.h
+++ b/include/asm-ia64/atomic.h
@@ -89,6 +89,7 @@ ia64_atomic64_sub (__s64 i, atomic64_t *v)
 }
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-ia64/mutex.h b/include/asm-ia64/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-ia64/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-m32r/atomic.h b/include/asm-m32r/atomic.h
index 70761278b6cb..3122fe106f05 100644
--- a/include/asm-m32r/atomic.h
+++ b/include/asm-m32r/atomic.h
@@ -243,6 +243,7 @@ static __inline__ int atomic_dec_return(atomic_t *v)
 #define atomic_add_negative(i,v) (atomic_add_return((i), (v)) < 0)
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-m32r/mutex.h b/include/asm-m32r/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-m32r/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-m68k/atomic.h b/include/asm-m68k/atomic.h
index b8a4e75d679d..a4a84d5c65d5 100644
--- a/include/asm-m68k/atomic.h
+++ b/include/asm-m68k/atomic.h
@@ -140,6 +140,7 @@ static inline void atomic_set_mask(unsigned long mask, unsigned long *v)
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-m68k/mutex.h b/include/asm-m68k/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-m68k/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-m68knommu/atomic.h b/include/asm-m68knommu/atomic.h
index 1702dbe9318c..6c4e4b63e454 100644
--- a/include/asm-m68knommu/atomic.h
+++ b/include/asm-m68knommu/atomic.h
@@ -129,6 +129,7 @@ static inline int atomic_sub_return(int i, atomic_t * v)
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-m68knommu/mutex.h b/include/asm-m68knommu/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-m68knommu/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-mips/atomic.h b/include/asm-mips/atomic.h
index 92256e43a938..94a95872d727 100644
--- a/include/asm-mips/atomic.h
+++ b/include/asm-mips/atomic.h
@@ -289,6 +289,7 @@ static __inline__ int atomic_sub_if_positive(int i, atomic_t * v)
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-mips/mutex.h b/include/asm-mips/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-mips/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-parisc/atomic.h b/include/asm-parisc/atomic.h
index 64ebd086c40d..2ca56d34aaad 100644
--- a/include/asm-parisc/atomic.h
+++ b/include/asm-parisc/atomic.h
@@ -165,6 +165,7 @@ static __inline__ int atomic_read(const atomic_t *v)
 
 /* exported interface */
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-parisc/mutex.h b/include/asm-parisc/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-parisc/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-powerpc/atomic.h b/include/asm-powerpc/atomic.h
index ae395a0632a6..248f9aec959c 100644
--- a/include/asm-powerpc/atomic.h
+++ b/include/asm-powerpc/atomic.h
@@ -165,6 +165,7 @@ static __inline__ int atomic_dec_return(atomic_t *v)
 }
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-powerpc/mutex.h b/include/asm-powerpc/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-powerpc/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-s390/atomic.h b/include/asm-s390/atomic.h
index d82aedf616fe..be6fefe223d6 100644
--- a/include/asm-s390/atomic.h
+++ b/include/asm-s390/atomic.h
@@ -75,6 +75,8 @@ static __inline__ void atomic_set_mask(unsigned long mask, atomic_t * v)
                __CS_LOOP(v, mask, "or");
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static __inline__ int atomic_cmpxchg(atomic_t *v, int old, int new)
 {
         __asm__ __volatile__("  cs   %0,%3,0(%2)\n"
diff --git a/include/asm-s390/mutex.h b/include/asm-s390/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-s390/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-sh/atomic.h b/include/asm-sh/atomic.h
index 618d8e0de348..fb627de217f2 100644
--- a/include/asm-sh/atomic.h
+++ b/include/asm-sh/atomic.h
@@ -101,6 +101,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-sh/mutex.h b/include/asm-sh/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-sh/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-sh64/atomic.h b/include/asm-sh64/atomic.h
index f3ce5c0df13a..28f2ea9b567b 100644
--- a/include/asm-sh64/atomic.h
+++ b/include/asm-sh64/atomic.h
@@ -113,6 +113,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-sh64/mutex.h b/include/asm-sh64/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-sh64/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-sparc/atomic.h b/include/asm-sparc/atomic.h
index accb4967e9d2..e1033170bd3a 100644
--- a/include/asm-sparc/atomic.h
+++ b/include/asm-sparc/atomic.h
@@ -20,6 +20,7 @@ typedef struct { volatile int counter; } atomic_t;
 
 extern int __atomic_add_return(int, atomic_t *);
 extern int atomic_cmpxchg(atomic_t *, int, int);
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 extern int atomic_add_unless(atomic_t *, int, int);
 extern void atomic_set(atomic_t *, int);
 
diff --git a/include/asm-sparc/mutex.h b/include/asm-sparc/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-sparc/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-sparc64/atomic.h b/include/asm-sparc64/atomic.h
index 11f5aa5d108c..25256bdc8aae 100644
--- a/include/asm-sparc64/atomic.h
+++ b/include/asm-sparc64/atomic.h
@@ -72,6 +72,7 @@ extern int atomic64_sub_ret(int, atomic64_t *);
 #define atomic64_add_negative(i, v) (atomic64_add_ret(i, v) < 0)
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 #define atomic_add_unless(v, a, u)                              \
 ({                                                              \
diff --git a/include/asm-sparc64/mutex.h b/include/asm-sparc64/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-sparc64/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-um/mutex.h b/include/asm-um/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-um/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-v850/atomic.h b/include/asm-v850/atomic.h
index f5b9ab6f4e70..166df00457ea 100644
--- a/include/asm-v850/atomic.h
+++ b/include/asm-v850/atomic.h
@@ -104,6 +104,8 @@ static inline int atomic_cmpxchg(atomic_t *v, int old, int new)
         return ret;
 }
 
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
+
 static inline int atomic_add_unless(atomic_t *v, int a, int u)
 {
         int ret;
diff --git a/include/asm-v850/mutex.h b/include/asm-v850/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-v850/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/asm-x86_64/atomic.h b/include/asm-x86_64/atomic.h
index 72eb071488c7..6b540237a2f8 100644
--- a/include/asm-x86_64/atomic.h
+++ b/include/asm-x86_64/atomic.h
@@ -389,6 +389,7 @@ static __inline__ long atomic64_sub_return(long i, atomic64_t *v)
 #define atomic64_dec_return(v)  (atomic64_sub_return(1,v))
 
 #define atomic_cmpxchg(v, old, new) ((int)cmpxchg(&((v)->counter), old, new))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-x86_64/mutex.h b/include/asm-x86_64/mutex.h
new file mode 100644
index 000000000000..818abfd262d1
--- /dev/null
+++ b/include/asm-x86_64/mutex.h
@@ -0,0 +1,113 @@
+/*
+ * Assembly implementation of the mutex fastpath, based on atomic
+ * decrement/increment.
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#ifndef _ASM_MUTEX_H
+#define _ASM_MUTEX_H
+
+/**
+ * __mutex_fastpath_lock - decrement and call function if negative
+ * @v: pointer of type atomic_t
+ * @fail_fn: function to call if the result is negative
+ *
+ * Atomically decrements @v and calls <fail_fn> if the result is negative.
+ */
+#define __mutex_fastpath_lock(v, fail_fn)                               \
+do {                                                                    \
+        unsigned long dummy;                                            \
+                                                                        \
+        typecheck(atomic_t *, v);                                       \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ __volatile__(                                           \
+                LOCK    "   decl (%%rdi)        \n"                     \
+                        "   js 2f               \n"                     \
+                        "1:                     \n"                     \
+                                                                        \
+                LOCK_SECTION_START("")                                  \
+                        "2: call "#fail_fn"     \n"                     \
+                        "   jmp 1b              \n"                     \
+                LOCK_SECTION_END                                        \
+                                                                        \
+                :"=D" (dummy)                                           \
+                : "D" (v)                                               \
+                : "rax", "rsi", "rdx", "rcx",                           \
+                  "r8", "r9", "r10", "r11", "memory");                  \
+} while (0)
+
+/**
+ *  __mutex_fastpath_lock_retval - try to take the lock by moving the count
+ *                                 from 1 to a 0 value
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: function to call if the original value was not 1
+ *
+ * Change the count from 1 to a value lower than 1, and call <fail_fn> if
+ * it wasn't 1 originally. This function returns 0 if the fastpath succeeds,
+ * or anything the slow path function returns
+ */
+static inline int
+__mutex_fastpath_lock_retval(atomic_t *count,
+                             int fastcall (*fail_fn)(atomic_t *))
+{
+        if (unlikely(atomic_dec_return(count) < 0))
+                return fail_fn(count);
+        else
+                return 0;
+}
+
+/**
+ * __mutex_fastpath_unlock - increment and call function if nonpositive
+ * @v: pointer of type atomic_t
+ * @fail_fn: function to call if the result is nonpositive
+ *
+ * Atomically increments @v and calls <fail_fn> if the result is nonpositive.
+ */
+#define __mutex_fastpath_unlock(v, fail_fn)                             \
+do {                                                                    \
+        unsigned long dummy;                                            \
+                                                                        \
+        typecheck(atomic_t *, v);                                       \
+        typecheck_fn(fastcall void (*)(atomic_t *), fail_fn);           \
+                                                                        \
+        __asm__ __volatile__(                                           \
+                LOCK    "   incl (%%rdi)        \n"                     \
+                        "   jle 2f              \n"                     \
+                        "1:                     \n"                     \
+                                                                        \
+                LOCK_SECTION_START("")                                  \
+                        "2: call "#fail_fn"     \n"                     \
+                        "   jmp 1b              \n"                     \
+                LOCK_SECTION_END                                        \
+                                                                        \
+                :"=D" (dummy)                                           \
+                : "D" (v)                                               \
+                : "rax", "rsi", "rdx", "rcx",                           \
+                  "r8", "r9", "r10", "r11", "memory");                  \
+} while (0)
+
+#define __mutex_slowpath_needs_to_unlock()      1
+
+/**
+ * __mutex_fastpath_trylock - try to acquire the mutex, without waiting
+ *
+ *  @count: pointer of type atomic_t
+ *  @fail_fn: fallback function
+ *
+ * Change the count from 1 to 0 and return 1 (success), or return 0 (failure)
+ * if it wasn't 1 originally. [the fallback function is never used on
+ * x86_64, because all x86_64 CPUs have a CMPXCHG instruction.]
+ */
+static inline int
+__mutex_fastpath_trylock(atomic_t *count, int (*fail_fn)(atomic_t *))
+{
+        if (likely(atomic_cmpxchg(count, 1, 0)) == 1)
+                return 1;
+        else
+                return 0;
+}
+
+#endif
diff --git a/include/asm-xtensa/atomic.h b/include/asm-xtensa/atomic.h
index e2ce06b101ad..fe105a123924 100644
--- a/include/asm-xtensa/atomic.h
+++ b/include/asm-xtensa/atomic.h
@@ -224,6 +224,7 @@ static inline int atomic_sub_return(int i, atomic_t * v)
 #define atomic_add_negative(i,v) (atomic_add_return((i),(v)) < 0)
 
 #define atomic_cmpxchg(v, o, n) ((int)cmpxchg(&((v)->counter), (o), (n)))
+#define atomic_xchg(v, new) (xchg(&((v)->counter), new))
 
 /**
  * atomic_add_unless - add unless the number is a given value
diff --git a/include/asm-xtensa/mutex.h b/include/asm-xtensa/mutex.h
new file mode 100644
index 000000000000..458c1f7fbc18
--- /dev/null
+++ b/include/asm-xtensa/mutex.h
@@ -0,0 +1,9 @@
+/*
+ * Pull in the generic implementation for the mutex fastpath.
+ *
+ * TODO: implement optimized primitives instead, or leave the generic
+ * implementation in place, or pick the atomic_xchg() based generic
+ * implementation. (see asm-generic/mutex-xchg.h for details)
+ */
+
+#include <asm-generic/mutex-dec.h>
diff --git a/include/linux/ext3_fs_i.h b/include/linux/ext3_fs_i.h
index 2914f7b07156..e71dd98dbcae 100644
--- a/include/linux/ext3_fs_i.h
+++ b/include/linux/ext3_fs_i.h
@@ -87,7 +87,7 @@ struct ext3_inode_info {
 #ifdef CONFIG_EXT3_FS_XATTR
         /*
          * Extended attributes can be read independently of the main file
-         * data. Taking i_sem even when reading would cause contention
+         * data. Taking i_mutex even when reading would cause contention
          * between readers of EAs and writers of regular file data, so
          * instead we synchronize on xattr_sem when reading or changing
          * EAs.
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 4c82219b0fae..92ae3e2067b0 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -219,6 +219,7 @@ extern int dir_notify_enable;
 #include <linux/prio_tree.h>
 #include <linux/init.h>
 #include <linux/sched.h>
+#include <linux/mutex.h>
 
 #include <asm/atomic.h>
 #include <asm/semaphore.h>
@@ -484,7 +485,7 @@ struct inode {
         unsigned long           i_blocks;
         unsigned short          i_bytes;
         spinlock_t              i_lock; /* i_blocks, i_bytes, maybe i_size */
-        struct semaphore        i_sem;
+        struct mutex            i_mutex;
         struct rw_semaphore     i_alloc_sem;
         struct inode_operations *i_op;
         struct file_operations  *i_fop; /* former ->i_op->default_file_ops */
@@ -820,7 +821,7 @@ struct super_block {
         unsigned long           s_magic;
         struct dentry           *s_root;
         struct rw_semaphore     s_umount;
-        struct semaphore        s_lock;
+        struct mutex            s_lock;
         int                     s_count;
         int                     s_syncing;
         int                     s_need_sync_fs;
@@ -892,13 +893,13 @@ static inline int has_fs_excl(void)
 static inline void lock_super(struct super_block * sb)
 {
         get_fs_excl();
-        down(&sb->s_lock);
+        mutex_lock(&sb->s_lock);
 }
 
 static inline void unlock_super(struct super_block * sb)
 {
         put_fs_excl();
-        up(&sb->s_lock);
+        mutex_unlock(&sb->s_lock);
 }
 
 /*
@@ -1191,7 +1192,7 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc);
  *    directory.  The name should be stored in the @name (with the
  *    understanding that it is already pointing to a a %NAME_MAX+1 sized
  *    buffer.   get_name() should return %0 on success, a negative error code
- *    or error.  @get_name will be called without @parent->i_sem held.
+ *    or error.  @get_name will be called without @parent->i_mutex held.
  *
  * get_parent:
  *    @get_parent should find the parent directory for the given @child which
@@ -1213,7 +1214,7 @@ int sync_inode(struct inode *inode, struct writeback_control *wbc);
  *    nfsd_find_fh_dentry() in either the @obj or @parent parameters.
  *
  * Locking rules:
- *    get_parent is called with child->d_inode->i_sem down
+ *    get_parent is called with child->d_inode->i_mutex down
  *    get_name is not (which is possibly inconsistent)
  */
 
diff --git a/include/linux/ide.h b/include/linux/ide.h
index ef8d0cbb832f..9a8c05dbe4f3 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -18,6 +18,7 @@
 #include <linux/bio.h>
 #include <linux/device.h>
 #include <linux/pci.h>
+#include <linux/completion.h>
 #include <asm/byteorder.h>
 #include <asm/system.h>
 #include <asm/io.h>
@@ -638,7 +639,7 @@ typedef struct ide_drive_s {
         int             crc_count;      /* crc counter to reduce drive speed */
         struct list_head list;
         struct device   gendev;
-        struct semaphore gendev_rel_sem;        /* to deal with device release() */
+        struct completion gendev_rel_comp;      /* to deal with device release() */
 } ide_drive_t;
 
 #define to_ide_device(dev)container_of(dev, ide_drive_t, gendev)
@@ -794,7 +795,7 @@ typedef struct hwif_s {
         unsigned        sg_mapped  : 1; /* sg_table and sg_nents are ready */
 
         struct device   gendev;
-        struct semaphore gendev_rel_sem; /* To deal with device release() */
+        struct completion gendev_rel_comp; /* To deal with device release() */
 
         void            *hwif_data;     /* extra hwif data */
 
diff --git a/include/linux/jffs2_fs_i.h b/include/linux/jffs2_fs_i.h
index ef85ab56302b..ad565bf9dcc1 100644
--- a/include/linux/jffs2_fs_i.h
+++ b/include/linux/jffs2_fs_i.h
@@ -8,11 +8,11 @@
 #include <asm/semaphore.h>
 
 struct jffs2_inode_info {
-        /* We need an internal semaphore similar to inode->i_sem.
+        /* We need an internal mutex similar to inode->i_mutex.
            Unfortunately, we can't used the existing one, because
            either the GC would deadlock, or we'd have to release it
            before letting GC proceed. Or we'd have to put ugliness
-           into the GC code so it didn't attempt to obtain the i_sem
+           into the GC code so it didn't attempt to obtain the i_mutex
            for the inode(s) which are already locked */
         struct semaphore sem;
 
diff --git a/include/linux/kernel.h b/include/linux/kernel.h
index ca7ff8fdd090..d0e6ca3b00ef 100644
--- a/include/linux/kernel.h
+++ b/include/linux/kernel.h
@@ -286,6 +286,15 @@ extern void dump_stack(void);
         1; \
 })
 
+/*
+ * Check at compile time that 'function' is a certain type, or is a pointer
+ * to that type (needs to use typedef for the function type.)
+ */
+#define typecheck_fn(type,function) \
+({      typeof(type) __tmp = function; \
+        (void)__tmp; \
+})
+
 #endif /* __KERNEL__ */
 
 #define SI_LOAD_SHIFT   16
diff --git a/include/linux/loop.h b/include/linux/loop.h
index 40f63c9879d2..f96506782ebe 100644
--- a/include/linux/loop.h
+++ b/include/linux/loop.h
@@ -58,9 +58,9 @@ struct loop_device {
         struct bio              *lo_bio;
         struct bio              *lo_biotail;
         int                     lo_state;
-        struct semaphore        lo_sem;
+        struct completion       lo_done;
+        struct completion       lo_bh_done;
         struct semaphore        lo_ctl_mutex;
-        struct semaphore        lo_bh_mutex;
         int                     lo_pending;
 
         request_queue_t         *lo_queue;
diff --git a/include/linux/mm.h b/include/linux/mm.h
index df80e63903b5..3f1fafc0245e 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -13,6 +13,7 @@
 #include <linux/rbtree.h>
 #include <linux/prio_tree.h>
 #include <linux/fs.h>
+#include <linux/mutex.h>
 
 struct mempolicy;
 struct anon_vma;
@@ -1024,6 +1025,9 @@ static inline void vm_stat_account(struct mm_struct *mm,
 static inline void
 kernel_map_pages(struct page *page, int numpages, int enable)
 {
+        if (!PageHighMem(page) && !enable)
+                mutex_debug_check_no_locks_freed(page_address(page),
+                                                 page_address(page + numpages));
 }
 #endif
 
diff --git a/include/linux/mutex-debug.h b/include/linux/mutex-debug.h
new file mode 100644
index 000000000000..0ccd8f983b50
--- /dev/null
+++ b/include/linux/mutex-debug.h
@@ -0,0 +1,21 @@
+#ifndef __LINUX_MUTEX_DEBUG_H
+#define __LINUX_MUTEX_DEBUG_H
+
+/*
+ * Mutexes - debugging helpers:
+ */
+
+#define __DEBUG_MUTEX_INITIALIZER(lockname) \
+        , .held_list = LIST_HEAD_INIT(lockname.held_list), \
+          .name = #lockname , .magic = &lockname
+
+#define mutex_init(sem)         __mutex_init(sem, __FUNCTION__)
+
+extern void FASTCALL(mutex_destroy(struct mutex *lock));
+
+extern void mutex_debug_show_all_locks(void);
+extern void mutex_debug_show_held_locks(struct task_struct *filter);
+extern void mutex_debug_check_no_locks_held(struct task_struct *task);
+extern void mutex_debug_check_no_locks_freed(const void *from, const void *to);
+
+#endif
diff --git a/include/linux/mutex.h b/include/linux/mutex.h
new file mode 100644
index 000000000000..9bce0fee68d4
--- /dev/null
+++ b/include/linux/mutex.h
@@ -0,0 +1,119 @@
+/*
+ * Mutexes: blocking mutual exclusion locks
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * This file contains the main data structure and API definitions.
+ */
+#ifndef __LINUX_MUTEX_H
+#define __LINUX_MUTEX_H
+
+#include <linux/list.h>
+#include <linux/spinlock_types.h>
+
+#include <asm/atomic.h>
+
+/*
+ * Simple, straightforward mutexes with strict semantics:
+ *
+ * - only one task can hold the mutex at a time
+ * - only the owner can unlock the mutex
+ * - multiple unlocks are not permitted
+ * - recursive locking is not permitted
+ * - a mutex object must be initialized via the API
+ * - a mutex object must not be initialized via memset or copying
+ * - task may not exit with mutex held
+ * - memory areas where held locks reside must not be freed
+ * - held mutexes must not be reinitialized
+ * - mutexes may not be used in irq contexts
+ *
+ * These semantics are fully enforced when DEBUG_MUTEXES is
+ * enabled. Furthermore, besides enforcing the above rules, the mutex
+ * debugging code also implements a number of additional features
+ * that make lock debugging easier and faster:
+ *
+ * - uses symbolic names of mutexes, whenever they are printed in debug output
+ * - point-of-acquire tracking, symbolic lookup of function names
+ * - list of all locks held in the system, printout of them
+ * - owner tracking
+ * - detects self-recursing locks and prints out all relevant info
+ * - detects multi-task circular deadlocks and prints out all affected
+ *   locks and tasks (and only those tasks)
+ */
+struct mutex {
+        /* 1: unlocked, 0: locked, negative: locked, possible waiters */
+        atomic_t                count;
+        spinlock_t              wait_lock;
+        struct list_head        wait_list;
+#ifdef CONFIG_DEBUG_MUTEXES
+        struct thread_info      *owner;
+        struct list_head        held_list;
+        unsigned long           acquire_ip;
+        const char              *name;
+        void                    *magic;
+#endif
+};
+
+/*
+ * This is the control structure for tasks blocked on mutex,
+ * which resides on the blocked task's kernel stack:
+ */
+struct mutex_waiter {
+        struct list_head        list;
+        struct task_struct      *task;
+#ifdef CONFIG_DEBUG_MUTEXES
+        struct mutex            *lock;
+        void                    *magic;
+#endif
+};
+
+#ifdef CONFIG_DEBUG_MUTEXES
+# include <linux/mutex-debug.h>
+#else
+# define __DEBUG_MUTEX_INITIALIZER(lockname)
+# define mutex_init(mutex)                      __mutex_init(mutex, NULL)
+# define mutex_destroy(mutex)                           do { } while (0)
+# define mutex_debug_show_all_locks()                   do { } while (0)
+# define mutex_debug_show_held_locks(p)                 do { } while (0)
+# define mutex_debug_check_no_locks_held(task)          do { } while (0)
+# define mutex_debug_check_no_locks_freed(from, to)     do { } while (0)
+#endif
+
+#define __MUTEX_INITIALIZER(lockname) \
+                { .count = ATOMIC_INIT(1) \
+                , .wait_lock = SPIN_LOCK_UNLOCKED \
+                , .wait_list = LIST_HEAD_INIT(lockname.wait_list) \
+                __DEBUG_MUTEX_INITIALIZER(lockname) }
+
+#define DEFINE_MUTEX(mutexname) \
+        struct mutex mutexname = __MUTEX_INITIALIZER(mutexname)
+
+extern void fastcall __mutex_init(struct mutex *lock, const char *name);
+
+/***
+ * mutex_is_locked - is the mutex locked
+ * @lock: the mutex to be queried
+ *
+ * Returns 1 if the mutex is locked, 0 if unlocked.
+ */
+static inline int fastcall mutex_is_locked(struct mutex *lock)
+{
+        return atomic_read(&lock->count) != 1;
+}
+
+/*
+ * See kernel/mutex.c for detailed documentation of these APIs.
+ * Also see Documentation/mutex-design.txt.
+ */
+extern void fastcall mutex_lock(struct mutex *lock);
+extern int fastcall mutex_lock_interruptible(struct mutex *lock);
+/*
+ * NOTE: mutex_trylock() follows the spin_trylock() convention,
+ *       not the down_trylock() convention!
+ */
+extern int fastcall mutex_trylock(struct mutex *lock);
+extern void fastcall mutex_unlock(struct mutex *lock);
+
+#endif
diff --git a/include/linux/nfsd/nfsfh.h b/include/linux/nfsd/nfsfh.h
index bb842ea41033..0798b7781a6e 100644
--- a/include/linux/nfsd/nfsfh.h
+++ b/include/linux/nfsd/nfsfh.h
@@ -294,7 +294,7 @@ fill_post_wcc(struct svc_fh *fhp)
 /*
  * Lock a file handle/inode
  * NOTE: both fh_lock and fh_unlock are done "by hand" in
- * vfs.c:nfsd_rename as it needs to grab 2 i_sem's at once
+ * vfs.c:nfsd_rename as it needs to grab 2 i_mutex's at once
  * so, any changes here should be reflected there.
  */
 static inline void
@@ -317,7 +317,7 @@ fh_lock(struct svc_fh *fhp)
         }
 
         inode = dentry->d_inode;
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         fill_pre_wcc(fhp);
         fhp->fh_locked = 1;
 }
@@ -333,7 +333,7 @@ fh_unlock(struct svc_fh *fhp)
 
         if (fhp->fh_locked) {
                 fill_post_wcc(fhp);
-                up(&fhp->fh_dentry->d_inode->i_sem);
+                mutex_unlock(&fhp->fh_dentry->d_inode->i_mutex);
                 fhp->fh_locked = 0;
         }
 }
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 1767073df26f..b12e59c75752 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -37,7 +37,7 @@ struct pipe_inode_info {
    memory allocation, whereas PIPE_BUF makes atomicity guarantees.  */
 #define PIPE_SIZE               PAGE_SIZE
 
-#define PIPE_SEM(inode)         (&(inode).i_sem)
+#define PIPE_MUTEX(inode)       (&(inode).i_mutex)
 #define PIPE_WAIT(inode)        (&(inode).i_pipe->wait)
 #define PIPE_READERS(inode)     ((inode).i_pipe->readers)
 #define PIPE_WRITERS(inode)     ((inode).i_pipe->writers)
diff --git a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
index 001ab82df051..e276c5ba2bb7 100644
--- a/include/linux/reiserfs_fs.h
+++ b/include/linux/reiserfs_fs.h
@@ -1857,7 +1857,7 @@ void padd_item(char *item, int total_length, int length);
 #define GET_BLOCK_CREATE 1      /* add anything you need to find block */
 #define GET_BLOCK_NO_HOLE 2     /* return -ENOENT for file holes */
 #define GET_BLOCK_READ_DIRECT 4 /* read the tail if indirect item not found */
-#define GET_BLOCK_NO_ISEM     8 /* i_sem is not held, don't preallocate */
+#define GET_BLOCK_NO_IMUX     8 /* i_mutex is not held, don't preallocate */
 #define GET_BLOCK_NO_DANGLE   16        /* don't leave any transactions running */
 
 int restart_transaction(struct reiserfs_transaction_handle *th,
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 78eb92ae4d94..85b53f87c703 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -817,6 +817,11 @@ struct task_struct {
 /* Protection of proc_dentry: nesting proc_lock, dcache_lock, write_lock_irq(&tasklist_lock); */
         spinlock_t proc_lock;
 
+#ifdef CONFIG_DEBUG_MUTEXES
+        /* mutex deadlock detection */
+        struct mutex_waiter *blocked_on;
+#endif
+
 /* journalling filesystem info */
         void *journal_info;
 
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index c8943b53d8e6..a8aa6152eea6 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -660,7 +660,7 @@ asmlinkage long sys_mq_open(const char __user *u_name, int oflag, mode_t mode,
         if (fd < 0)
                 goto out_putname;
 
-        down(&mqueue_mnt->mnt_root->d_inode->i_sem);
+        mutex_lock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
         dentry = lookup_one_len(name, mqueue_mnt->mnt_root, strlen(name));
         if (IS_ERR(dentry)) {
                 error = PTR_ERR(dentry);
@@ -697,7 +697,7 @@ out_putfd:
 out_err:
         fd = error;
 out_upsem:
-        up(&mqueue_mnt->mnt_root->d_inode->i_sem);
+        mutex_unlock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
 out_putname:
         putname(name);
         return fd;
@@ -714,7 +714,7 @@ asmlinkage long sys_mq_unlink(const char __user *u_name)
         if (IS_ERR(name))
                 return PTR_ERR(name);
 
-        down(&mqueue_mnt->mnt_root->d_inode->i_sem);
+        mutex_lock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
         dentry = lookup_one_len(name, mqueue_mnt->mnt_root, strlen(name));
         if (IS_ERR(dentry)) {
                 err = PTR_ERR(dentry);
@@ -735,7 +735,7 @@ out_err:
         dput(dentry);
 
 out_unlock:
-        up(&mqueue_mnt->mnt_root->d_inode->i_sem);
+        mutex_unlock(&mqueue_mnt->mnt_root->d_inode->i_mutex);
         putname(name);
         if (inode)
                 iput(inode);
diff --git a/kernel/Makefile b/kernel/Makefile
index 4f5a1453093a..a940bac02837 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -7,8 +7,9 @@ obj-y     = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
             sysctl.o capability.o ptrace.o timer.o user.o \
             signal.o sys.o kmod.o workqueue.o pid.o \
             rcupdate.o intermodule.o extable.o params.o posix-timers.o \
-            kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o
+            kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o
 
+obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
 obj-$(CONFIG_FUTEX) += futex.o
 obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
 obj-$(CONFIG_SMP) += cpu.o spinlock.o
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index eab64e23bcae..2a75e44e1a41 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1513,7 +1513,7 @@ static int cpuset_add_file(struct dentry *dir, const struct cftype *cft)
         struct dentry *dentry;
         int error;
 
-        down(&dir->d_inode->i_sem);
+        mutex_lock(&dir->d_inode->i_mutex);
         dentry = cpuset_get_dentry(dir, cft->name);
         if (!IS_ERR(dentry)) {
                 error = cpuset_create_file(dentry, 0644 | S_IFREG);
@@ -1522,7 +1522,7 @@ static int cpuset_add_file(struct dentry *dir, const struct cftype *cft)
                 dput(dentry);
         } else
                 error = PTR_ERR(dentry);
-        up(&dir->d_inode->i_sem);
+        mutex_unlock(&dir->d_inode->i_mutex);
         return error;
 }
 
@@ -1793,7 +1793,7 @@ static long cpuset_create(struct cpuset *parent, const char *name, int mode)
 
         /*
          * Release manage_sem before cpuset_populate_dir() because it
-         * will down() this new directory's i_sem and if we race with
+         * will down() this new directory's i_mutex and if we race with
          * another mkdir, we might deadlock.
          */
         up(&manage_sem);
@@ -1812,7 +1812,7 @@ static int cpuset_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
         struct cpuset *c_parent = dentry->d_parent->d_fsdata;
 
-        /* the vfs holds inode->i_sem already */
+        /* the vfs holds inode->i_mutex already */
         return cpuset_create(c_parent, dentry->d_name.name, mode | S_IFDIR);
 }
 
@@ -1823,7 +1823,7 @@ static int cpuset_rmdir(struct inode *unused_dir, struct dentry *dentry)
         struct cpuset *parent;
         char *pathbuf = NULL;
 
-        /* the vfs holds both inode->i_sem already */
+        /* the vfs holds both inode->i_mutex already */
 
         down(&manage_sem);
         cpuset_update_task_memory_state();
diff --git a/kernel/exit.c b/kernel/exit.c
index caceabf3f230..309a46fa16f8 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -29,6 +29,7 @@
 #include <linux/syscalls.h>
 #include <linux/signal.h>
 #include <linux/cn_proc.h>
+#include <linux/mutex.h>
 
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
@@ -869,6 +870,10 @@ fastcall NORET_TYPE void do_exit(long code)
         mpol_free(tsk->mempolicy);
         tsk->mempolicy = NULL;
 #endif
+        /*
+         * If DEBUG_MUTEXES is on, make sure we are holding no locks:
+         */
+        mutex_debug_check_no_locks_held(tsk);
 
         /* PF_DEAD causes final put_task_struct after we schedule. */
         preempt_disable();
diff --git a/kernel/fork.c b/kernel/fork.c
index 72e3252c6763..b18d64554feb 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -979,6 +979,10 @@ static task_t *copy_process(unsigned long clone_flags,
         }
 #endif
 
+#ifdef CONFIG_DEBUG_MUTEXES
+        p->blocked_on = NULL; /* not blocked yet */
+#endif
+
         p->tgid = p->pid;
         if (clone_flags & CLONE_THREAD)
                 p->tgid = current->tgid;
diff --git a/kernel/mutex-debug.c b/kernel/mutex-debug.c
new file mode 100644
index 000000000000..4fcb051a8b9e
--- /dev/null
+++ b/kernel/mutex-debug.c
@@ -0,0 +1,464 @@
+/*
+ * kernel/mutex-debug.c
+ *
+ * Debugging code for mutexes
+ *
+ * Started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * lock debugging, locking tree, deadlock detection started by:
+ *
+ *  Copyright (C) 2004, LynuxWorks, Inc., Igor Manyilov, Bill Huey
+ *  Released under the General Public License (GPL).
+ */
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/delay.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/kallsyms.h>
+#include <linux/interrupt.h>
+
+#include <asm/mutex.h>
+
+#include "mutex-debug.h"
+
+/*
+ * We need a global lock when we walk through the multi-process
+ * lock tree. Only used in the deadlock-debugging case.
+ */
+DEFINE_SPINLOCK(debug_mutex_lock);
+
+/*
+ * All locks held by all tasks, in a single global list:
+ */
+LIST_HEAD(debug_mutex_held_locks);
+
+/*
+ * In the debug case we carry the caller's instruction pointer into
+ * other functions, but we dont want the function argument overhead
+ * in the nondebug case - hence these macros:
+ */
+#define __IP_DECL__             , unsigned long ip
+#define __IP__                  , ip
+#define __RET_IP__              , (unsigned long)__builtin_return_address(0)
+
+/*
+ * "mutex debugging enabled" flag. We turn it off when we detect
+ * the first problem because we dont want to recurse back
+ * into the tracing code when doing error printk or
+ * executing a BUG():
+ */
+int debug_mutex_on = 1;
+
+static void printk_task(struct task_struct *p)
+{
+        if (p)
+                printk("%16s:%5d [%p, %3d]", p->comm, p->pid, p, p->prio);
+        else
+                printk("<none>");
+}
+
+static void printk_ti(struct thread_info *ti)
+{
+        if (ti)
+                printk_task(ti->task);
+        else
+                printk("<none>");
+}
+
+static void printk_task_short(struct task_struct *p)
+{
+        if (p)
+                printk("%s/%d [%p, %3d]", p->comm, p->pid, p, p->prio);
+        else
+                printk("<none>");
+}
+
+static void printk_lock(struct mutex *lock, int print_owner)
+{
+        printk(" [%p] {%s}\n", lock, lock->name);
+
+        if (print_owner && lock->owner) {
+                printk(".. held by:  ");
+                printk_ti(lock->owner);
+                printk("\n");
+        }
+        if (lock->owner) {
+                printk("... acquired at:               ");
+                print_symbol("%s\n", lock->acquire_ip);
+        }
+}
+
+/*
+ * printk locks held by a task:
+ */
+static void show_task_locks(struct task_struct *p)
+{
+        switch (p->state) {
+        case TASK_RUNNING:              printk("R"); break;
+        case TASK_INTERRUPTIBLE:        printk("S"); break;
+        case TASK_UNINTERRUPTIBLE:      printk("D"); break;
+        case TASK_STOPPED:              printk("T"); break;
+        case EXIT_ZOMBIE:               printk("Z"); break;
+        case EXIT_DEAD:                 printk("X"); break;
+        default:                        printk("?"); break;
+        }
+        printk_task(p);
+        if (p->blocked_on) {
+                struct mutex *lock = p->blocked_on->lock;
+
+                printk(" blocked on mutex:");
+                printk_lock(lock, 1);
+        } else
+                printk(" (not blocked on mutex)\n");
+}
+
+/*
+ * printk all locks held in the system (if filter == NULL),
+ * or all locks belonging to a single task (if filter != NULL):
+ */
+void show_held_locks(struct task_struct *filter)
+{
+        struct list_head *curr, *cursor = NULL;
+        struct mutex *lock;
+        struct thread_info *t;
+        unsigned long flags;
+        int count = 0;
+
+        if (filter) {
+                printk("------------------------------\n");
+                printk("| showing all locks held by: |  (");
+                printk_task_short(filter);
+                printk("):\n");
+                printk("------------------------------\n");
+        } else {
+                printk("---------------------------\n");
+                printk("| showing all locks held: |\n");
+                printk("---------------------------\n");
+        }
+
+        /*
+         * Play safe and acquire the global trace lock. We
+         * cannot printk with that lock held so we iterate
+         * very carefully:
+         */
+next:
+        debug_spin_lock_save(&debug_mutex_lock, flags);
+        list_for_each(curr, &debug_mutex_held_locks) {
+                if (cursor && curr != cursor)
+                        continue;
+                lock = list_entry(curr, struct mutex, held_list);
+                t = lock->owner;
+                if (filter && (t != filter->thread_info))
+                        continue;
+                count++;
+                cursor = curr->next;
+                debug_spin_lock_restore(&debug_mutex_lock, flags);
+
+                printk("\n#%03d:            ", count);
+                printk_lock(lock, filter ? 0 : 1);
+                goto next;
+        }
+        debug_spin_lock_restore(&debug_mutex_lock, flags);
+        printk("\n");
+}
+
+void mutex_debug_show_all_locks(void)
+{
+        struct task_struct *g, *p;
+        int count = 10;
+        int unlock = 1;
+
+        printk("\nShowing all blocking locks in the system:\n");
+
+        /*
+         * Here we try to get the tasklist_lock as hard as possible,
+         * if not successful after 2 seconds we ignore it (but keep
+         * trying). This is to enable a debug printout even if a
+         * tasklist_lock-holding task deadlocks or crashes.
+         */
+retry:
+        if (!read_trylock(&tasklist_lock)) {
+                if (count == 10)
+                        printk("hm, tasklist_lock locked, retrying... ");
+                if (count) {
+                        count--;
+                        printk(" #%d", 10-count);
+                        mdelay(200);
+                        goto retry;
+                }
+                printk(" ignoring it.\n");
+                unlock = 0;
+        }
+        if (count != 10)
+                printk(" locked it.\n");
+
+        do_each_thread(g, p) {
+                show_task_locks(p);
+                if (!unlock)
+                        if (read_trylock(&tasklist_lock))
+                                unlock = 1;
+        } while_each_thread(g, p);
+
+        printk("\n");
+        show_held_locks(NULL);
+        printk("=============================================\n\n");
+
+        if (unlock)
+                read_unlock(&tasklist_lock);
+}
+
+static void report_deadlock(struct task_struct *task, struct mutex *lock,
+                            struct mutex *lockblk, unsigned long ip)
+{
+        printk("\n%s/%d is trying to acquire this lock:\n",
+                current->comm, current->pid);
+        printk_lock(lock, 1);
+        printk("... trying at:                 ");
+        print_symbol("%s\n", ip);
+        show_held_locks(current);
+
+        if (lockblk) {
+                printk("but %s/%d is deadlocking current task %s/%d!\n\n",
+                        task->comm, task->pid, current->comm, current->pid);
+                printk("\n%s/%d is blocked on this lock:\n",
+                        task->comm, task->pid);
+                printk_lock(lockblk, 1);
+
+                show_held_locks(task);
+
+                printk("\n%s/%d's [blocked] stackdump:\n\n",
+                        task->comm, task->pid);
+                show_stack(task, NULL);
+        }
+
+        printk("\n%s/%d's [current] stackdump:\n\n",
+                current->comm, current->pid);
+        dump_stack();
+        mutex_debug_show_all_locks();
+        printk("[ turning off deadlock detection. Please report this. ]\n\n");
+        local_irq_disable();
+}
+
+/*
+ * Recursively check for mutex deadlocks:
+ */
+static int check_deadlock(struct mutex *lock, int depth,
+                          struct thread_info *ti, unsigned long ip)
+{
+        struct mutex *lockblk;
+        struct task_struct *task;
+
+        if (!debug_mutex_on)
+                return 0;
+
+        ti = lock->owner;
+        if (!ti)
+                return 0;
+
+        task = ti->task;
+        lockblk = NULL;
+        if (task->blocked_on)
+                lockblk = task->blocked_on->lock;
+
+        /* Self-deadlock: */
+        if (current == task) {
+                DEBUG_OFF();
+                if (depth)
+                        return 1;
+                printk("\n==========================================\n");
+                printk(  "[ BUG: lock recursion deadlock detected! |\n");
+                printk(  "------------------------------------------\n");
+                report_deadlock(task, lock, NULL, ip);
+                return 0;
+        }
+
+        /* Ugh, something corrupted the lock data structure? */
+        if (depth > 20) {
+                DEBUG_OFF();
+                printk("\n===========================================\n");
+                printk(  "[ BUG: infinite lock dependency detected!? |\n");
+                printk(  "-------------------------------------------\n");
+                report_deadlock(task, lock, lockblk, ip);
+                return 0;
+        }
+
+        /* Recursively check for dependencies: */
+        if (lockblk && check_deadlock(lockblk, depth+1, ti, ip)) {
+                printk("\n============================================\n");
+                printk(  "[ BUG: circular locking deadlock detected! ]\n");
+                printk(  "--------------------------------------------\n");
+                report_deadlock(task, lock, lockblk, ip);
+                return 0;
+        }
+        return 0;
+}
+
+/*
+ * Called when a task exits, this function checks whether the
+ * task is holding any locks, and reports the first one if so:
+ */
+void mutex_debug_check_no_locks_held(struct task_struct *task)
+{
+        struct list_head *curr, *next;
+        struct thread_info *t;
+        unsigned long flags;
+        struct mutex *lock;
+
+        if (!debug_mutex_on)
+                return;
+
+        debug_spin_lock_save(&debug_mutex_lock, flags);
+        list_for_each_safe(curr, next, &debug_mutex_held_locks) {
+                lock = list_entry(curr, struct mutex, held_list);
+                t = lock->owner;
+                if (t != task->thread_info)
+                        continue;
+                list_del_init(curr);
+                DEBUG_OFF();
+                debug_spin_lock_restore(&debug_mutex_lock, flags);
+
+                printk("BUG: %s/%d, lock held at task exit time!\n",
+                        task->comm, task->pid);
+                printk_lock(lock, 1);
+                if (lock->owner != task->thread_info)
+                        printk("exiting task is not even the owner??\n");
+                return;
+        }
+        debug_spin_lock_restore(&debug_mutex_lock, flags);
+}
+
+/*
+ * Called when kernel memory is freed (or unmapped), or if a mutex
+ * is destroyed or reinitialized - this code checks whether there is
+ * any held lock in the memory range of <from> to <to>:
+ */
+void mutex_debug_check_no_locks_freed(const void *from, const void *to)
+{
+        struct list_head *curr, *next;
+        unsigned long flags;
+        struct mutex *lock;
+        void *lock_addr;
+
+        if (!debug_mutex_on)
+                return;
+
+        debug_spin_lock_save(&debug_mutex_lock, flags);
+        list_for_each_safe(curr, next, &debug_mutex_held_locks) {
+                lock = list_entry(curr, struct mutex, held_list);
+                lock_addr = lock;
+                if (lock_addr < from || lock_addr >= to)
+                        continue;
+                list_del_init(curr);
+                DEBUG_OFF();
+                debug_spin_lock_restore(&debug_mutex_lock, flags);
+
+                printk("BUG: %s/%d, active lock [%p(%p-%p)] freed!\n",
+                        current->comm, current->pid, lock, from, to);
+                dump_stack();
+                printk_lock(lock, 1);
+                if (lock->owner != current_thread_info())
+                        printk("freeing task is not even the owner??\n");
+                return;
+        }
+        debug_spin_lock_restore(&debug_mutex_lock, flags);
+}
+
+/*
+ * Must be called with lock->wait_lock held.
+ */
+void debug_mutex_set_owner(struct mutex *lock,
+                           struct thread_info *new_owner __IP_DECL__)
+{
+        lock->owner = new_owner;
+        DEBUG_WARN_ON(!list_empty(&lock->held_list));
+        if (debug_mutex_on) {
+                list_add_tail(&lock->held_list, &debug_mutex_held_locks);
+                lock->acquire_ip = ip;
+        }
+}
+
+void debug_mutex_init_waiter(struct mutex_waiter *waiter)
+{
+        memset(waiter, 0x11, sizeof(*waiter));
+        waiter->magic = waiter;
+        INIT_LIST_HEAD(&waiter->list);
+}
+
+void debug_mutex_wake_waiter(struct mutex *lock, struct mutex_waiter *waiter)
+{
+        SMP_DEBUG_WARN_ON(!spin_is_locked(&lock->wait_lock));
+        DEBUG_WARN_ON(list_empty(&lock->wait_list));
+        DEBUG_WARN_ON(waiter->magic != waiter);
+        DEBUG_WARN_ON(list_empty(&waiter->list));
+}
+
+void debug_mutex_free_waiter(struct mutex_waiter *waiter)
+{
+        DEBUG_WARN_ON(!list_empty(&waiter->list));
+        memset(waiter, 0x22, sizeof(*waiter));
+}
+
+void debug_mutex_add_waiter(struct mutex *lock, struct mutex_waiter *waiter,
+                            struct thread_info *ti __IP_DECL__)
+{
+        SMP_DEBUG_WARN_ON(!spin_is_locked(&lock->wait_lock));
+        check_deadlock(lock, 0, ti, ip);
+        /* Mark the current thread as blocked on the lock: */
+        ti->task->blocked_on = waiter;
+        waiter->lock = lock;
+}
+
+void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
+                         struct thread_info *ti)
+{
+        DEBUG_WARN_ON(list_empty(&waiter->list));
+        DEBUG_WARN_ON(waiter->task != ti->task);
+        DEBUG_WARN_ON(ti->task->blocked_on != waiter);
+        ti->task->blocked_on = NULL;
+
+        list_del_init(&waiter->list);
+        waiter->task = NULL;
+}
+
+void debug_mutex_unlock(struct mutex *lock)
+{
+        DEBUG_WARN_ON(lock->magic != lock);
+        DEBUG_WARN_ON(!lock->wait_list.prev && !lock->wait_list.next);
+        DEBUG_WARN_ON(lock->owner != current_thread_info());
+        if (debug_mutex_on) {
+                DEBUG_WARN_ON(list_empty(&lock->held_list));
+                list_del_init(&lock->held_list);
+        }
+}
+
+void debug_mutex_init(struct mutex *lock, const char *name)
+{
+        /*
+         * Make sure we are not reinitializing a held lock:
+         */
+        mutex_debug_check_no_locks_freed((void *)lock, (void *)(lock + 1));
+        lock->owner = NULL;
+        INIT_LIST_HEAD(&lock->held_list);
+        lock->name = name;
+        lock->magic = lock;
+}
+
+/***
+ * mutex_destroy - mark a mutex unusable
+ * @lock: the mutex to be destroyed
+ *
+ * This function marks the mutex uninitialized, and any subsequent
+ * use of the mutex is forbidden. The mutex must not be locked when
+ * this function is called.
+ */
+void fastcall mutex_destroy(struct mutex *lock)
+{
+        DEBUG_WARN_ON(mutex_is_locked(lock));
+        lock->magic = NULL;
+}
+
+EXPORT_SYMBOL_GPL(mutex_destroy);
+
diff --git a/kernel/mutex-debug.h b/kernel/mutex-debug.h
new file mode 100644
index 000000000000..fd384050acb1
--- /dev/null
+++ b/kernel/mutex-debug.h
@@ -0,0 +1,134 @@
+/*
+ * Mutexes: blocking mutual exclusion locks
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * This file contains mutex debugging related internal declarations,
+ * prototypes and inline functions, for the CONFIG_DEBUG_MUTEXES case.
+ * More details are in kernel/mutex-debug.c.
+ */
+
+extern spinlock_t debug_mutex_lock;
+extern struct list_head debug_mutex_held_locks;
+extern int debug_mutex_on;
+
+/*
+ * In the debug case we carry the caller's instruction pointer into
+ * other functions, but we dont want the function argument overhead
+ * in the nondebug case - hence these macros:
+ */
+#define __IP_DECL__             , unsigned long ip
+#define __IP__                  , ip
+#define __RET_IP__              , (unsigned long)__builtin_return_address(0)
+
+/*
+ * This must be called with lock->wait_lock held.
+ */
+extern void debug_mutex_set_owner(struct mutex *lock,
+                                  struct thread_info *new_owner __IP_DECL__);
+
+static inline void debug_mutex_clear_owner(struct mutex *lock)
+{
+        lock->owner = NULL;
+}
+
+extern void debug_mutex_init_waiter(struct mutex_waiter *waiter);
+extern void debug_mutex_wake_waiter(struct mutex *lock,
+                                    struct mutex_waiter *waiter);
+extern void debug_mutex_free_waiter(struct mutex_waiter *waiter);
+extern void debug_mutex_add_waiter(struct mutex *lock,
+                                   struct mutex_waiter *waiter,
+                                   struct thread_info *ti __IP_DECL__);
+extern void mutex_remove_waiter(struct mutex *lock, struct mutex_waiter *waiter,
+                                struct thread_info *ti);
+extern void debug_mutex_unlock(struct mutex *lock);
+extern void debug_mutex_init(struct mutex *lock, const char *name);
+
+#define debug_spin_lock(lock)                           \
+        do {                                            \
+                local_irq_disable();                    \
+                if (debug_mutex_on)                     \
+                        spin_lock(lock);                \
+        } while (0)
+
+#define debug_spin_unlock(lock)                         \
+        do {                                            \
+                if (debug_mutex_on)                     \
+                        spin_unlock(lock);              \
+                local_irq_enable();                     \
+                preempt_check_resched();                \
+        } while (0)
+
+#define debug_spin_lock_save(lock, flags)               \
+        do {                                            \
+                local_irq_save(flags);                  \
+                if (debug_mutex_on)                     \
+                        spin_lock(lock);                \
+        } while (0)
+
+#define debug_spin_lock_restore(lock, flags)            \
+        do {                                            \
+                if (debug_mutex_on)                     \
+                        spin_unlock(lock);              \
+                local_irq_restore(flags);               \
+                preempt_check_resched();                \
+        } while (0)
+
+#define spin_lock_mutex(lock)                           \
+        do {                                            \
+                struct mutex *l = container_of(lock, struct mutex, wait_lock); \
+                                                        \
+                DEBUG_WARN_ON(in_interrupt());          \
+                debug_spin_lock(&debug_mutex_lock);     \
+                spin_lock(lock);                        \
+                DEBUG_WARN_ON(l->magic != l);           \
+        } while (0)
+
+#define spin_unlock_mutex(lock)                         \
+        do {                                            \
+                spin_unlock(lock);                      \
+                debug_spin_unlock(&debug_mutex_lock);   \
+        } while (0)
+
+#define DEBUG_OFF()                                     \
+do {                                                    \
+        if (debug_mutex_on) {                           \
+                debug_mutex_on = 0;                     \
+                console_verbose();                      \
+                if (spin_is_locked(&debug_mutex_lock))  \
+                        spin_unlock(&debug_mutex_lock); \
+        }                                               \
+} while (0)
+
+#define DEBUG_BUG()                                     \
+do {                                                    \
+        if (debug_mutex_on) {                           \
+                DEBUG_OFF();                            \
+                BUG();                                  \
+        }                                               \
+} while (0)
+
+#define DEBUG_WARN_ON(c)                                \
+do {                                                    \
+        if (unlikely(c && debug_mutex_on)) {            \
+                DEBUG_OFF();                            \
+                WARN_ON(1);                             \
+        }                                               \
+} while (0)
+
+# define DEBUG_BUG_ON(c)                                \
+do {                                                    \
+        if (unlikely(c))                                \
+                DEBUG_BUG();                            \
+} while (0)
+
+#ifdef CONFIG_SMP
+# define SMP_DEBUG_WARN_ON(c)                   DEBUG_WARN_ON(c)
+# define SMP_DEBUG_BUG_ON(c)                    DEBUG_BUG_ON(c)
+#else
+# define SMP_DEBUG_WARN_ON(c)                   do { } while (0)
+# define SMP_DEBUG_BUG_ON(c)                    do { } while (0)
+#endif
+
diff --git a/kernel/mutex.c b/kernel/mutex.c
new file mode 100644
index 000000000000..7eb960661441
--- /dev/null
+++ b/kernel/mutex.c
@@ -0,0 +1,325 @@
+/*
+ * kernel/mutex.c
+ *
+ * Mutexes: blocking mutual exclusion locks
+ *
+ * Started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * Many thanks to Arjan van de Ven, Thomas Gleixner, Steven Rostedt and
+ * David Howells for suggestions and improvements.
+ *
+ * Also see Documentation/mutex-design.txt.
+ */
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/module.h>
+#include <linux/spinlock.h>
+#include <linux/interrupt.h>
+
+/*
+ * In the DEBUG case we are using the "NULL fastpath" for mutexes,
+ * which forces all calls into the slowpath:
+ */
+#ifdef CONFIG_DEBUG_MUTEXES
+# include "mutex-debug.h"
+# include <asm-generic/mutex-null.h>
+#else
+# include "mutex.h"
+# include <asm/mutex.h>
+#endif
+
+/***
+ * mutex_init - initialize the mutex
+ * @lock: the mutex to be initialized
+ *
+ * Initialize the mutex to unlocked state.
+ *
+ * It is not allowed to initialize an already locked mutex.
+ */
+void fastcall __mutex_init(struct mutex *lock, const char *name)
+{
+        atomic_set(&lock->count, 1);
+        spin_lock_init(&lock->wait_lock);
+        INIT_LIST_HEAD(&lock->wait_list);
+
+        debug_mutex_init(lock, name);
+}
+
+EXPORT_SYMBOL(__mutex_init);
+
+/*
+ * We split the mutex lock/unlock logic into separate fastpath and
+ * slowpath functions, to reduce the register pressure on the fastpath.
+ * We also put the fastpath first in the kernel image, to make sure the
+ * branch is predicted by the CPU as default-untaken.
+ */
+static void fastcall noinline __sched
+__mutex_lock_slowpath(atomic_t *lock_count __IP_DECL__);
+
+/***
+ * mutex_lock - acquire the mutex
+ * @lock: the mutex to be acquired
+ *
+ * Lock the mutex exclusively for this task. If the mutex is not
+ * available right now, it will sleep until it can get it.
+ *
+ * The mutex must later on be released by the same task that
+ * acquired it. Recursive locking is not allowed. The task
+ * may not exit without first unlocking the mutex. Also, kernel
+ * memory where the mutex resides mutex must not be freed with
+ * the mutex still locked. The mutex must first be initialized
+ * (or statically defined) before it can be locked. memset()-ing
+ * the mutex to 0 is not allowed.
+ *
+ * ( The CONFIG_DEBUG_MUTEXES .config option turns on debugging
+ *   checks that will enforce the restrictions and will also do
+ *   deadlock debugging. )
+ *
+ * This function is similar to (but not equivalent to) down().
+ */
+void fastcall __sched mutex_lock(struct mutex *lock)
+{
+        /*
+         * The locking fastpath is the 1->0 transition from
+         * 'unlocked' into 'locked' state.
+         *
+         * NOTE: if asm/mutex.h is included, then some architectures
+         * rely on mutex_lock() having _no other code_ here but this
+         * fastpath. That allows the assembly fastpath to do
+         * tail-merging optimizations. (If you want to put testcode
+         * here, do it under #ifndef CONFIG_MUTEX_DEBUG.)
+         */
+        __mutex_fastpath_lock(&lock->count, __mutex_lock_slowpath);
+}
+
+EXPORT_SYMBOL(mutex_lock);
+
+static void fastcall noinline __sched
+__mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__);
+
+/***
+ * mutex_unlock - release the mutex
+ * @lock: the mutex to be released
+ *
+ * Unlock a mutex that has been locked by this task previously.
+ *
+ * This function must not be used in interrupt context. Unlocking
+ * of a not locked mutex is not allowed.
+ *
+ * This function is similar to (but not equivalent to) up().
+ */
+void fastcall __sched mutex_unlock(struct mutex *lock)
+{
+        /*
+         * The unlocking fastpath is the 0->1 transition from 'locked'
+         * into 'unlocked' state:
+         *
+         * NOTE: no other code must be here - see mutex_lock() .
+         */
+        __mutex_fastpath_unlock(&lock->count, __mutex_unlock_slowpath);
+}
+
+EXPORT_SYMBOL(mutex_unlock);
+
+/*
+ * Lock a mutex (possibly interruptible), slowpath:
+ */
+static inline int __sched
+__mutex_lock_common(struct mutex *lock, long state __IP_DECL__)
+{
+        struct task_struct *task = current;
+        struct mutex_waiter waiter;
+        unsigned int old_val;
+
+        debug_mutex_init_waiter(&waiter);
+
+        spin_lock_mutex(&lock->wait_lock);
+
+        debug_mutex_add_waiter(lock, &waiter, task->thread_info, ip);
+
+        /* add waiting tasks to the end of the waitqueue (FIFO): */
+        list_add_tail(&waiter.list, &lock->wait_list);
+        waiter.task = task;
+
+        for (;;) {
+                /*
+                 * Lets try to take the lock again - this is needed even if
+                 * we get here for the first time (shortly after failing to
+                 * acquire the lock), to make sure that we get a wakeup once
+                 * it's unlocked. Later on, if we sleep, this is the
+                 * operation that gives us the lock. We xchg it to -1, so
+                 * that when we release the lock, we properly wake up the
+                 * other waiters:
+                 */
+                old_val = atomic_xchg(&lock->count, -1);
+                if (old_val == 1)
+                        break;
+
+                /*
+                 * got a signal? (This code gets eliminated in the
+                 * TASK_UNINTERRUPTIBLE case.)
+                 */
+                if (unlikely(state == TASK_INTERRUPTIBLE &&
+                                                signal_pending(task))) {
+                        mutex_remove_waiter(lock, &waiter, task->thread_info);
+                        spin_unlock_mutex(&lock->wait_lock);
+
+                        debug_mutex_free_waiter(&waiter);
+                        return -EINTR;
+                }
+                __set_task_state(task, state);
+
+                /* didnt get the lock, go to sleep: */
+                spin_unlock_mutex(&lock->wait_lock);
+                schedule();
+                spin_lock_mutex(&lock->wait_lock);
+        }
+
+        /* got the lock - rejoice! */
+        mutex_remove_waiter(lock, &waiter, task->thread_info);
+        debug_mutex_set_owner(lock, task->thread_info __IP__);
+
+        /* set it to 0 if there are no waiters left: */
+        if (likely(list_empty(&lock->wait_list)))
+                atomic_set(&lock->count, 0);
+
+        spin_unlock_mutex(&lock->wait_lock);
+
+        debug_mutex_free_waiter(&waiter);
+
+        DEBUG_WARN_ON(list_empty(&lock->held_list));
+        DEBUG_WARN_ON(lock->owner != task->thread_info);
+
+        return 0;
+}
+
+static void fastcall noinline __sched
+__mutex_lock_slowpath(atomic_t *lock_count __IP_DECL__)
+{
+        struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+        __mutex_lock_common(lock, TASK_UNINTERRUPTIBLE __IP__);
+}
+
+/*
+ * Release the lock, slowpath:
+ */
+static fastcall noinline void
+__mutex_unlock_slowpath(atomic_t *lock_count __IP_DECL__)
+{
+        struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+        DEBUG_WARN_ON(lock->owner != current_thread_info());
+
+        spin_lock_mutex(&lock->wait_lock);
+
+        /*
+         * some architectures leave the lock unlocked in the fastpath failure
+         * case, others need to leave it locked. In the later case we have to
+         * unlock it here
+         */
+        if (__mutex_slowpath_needs_to_unlock())
+                atomic_set(&lock->count, 1);
+
+        debug_mutex_unlock(lock);
+
+        if (!list_empty(&lock->wait_list)) {
+                /* get the first entry from the wait-list: */
+                struct mutex_waiter *waiter =
+                                list_entry(lock->wait_list.next,
+                                           struct mutex_waiter, list);
+
+                debug_mutex_wake_waiter(lock, waiter);
+
+                wake_up_process(waiter->task);
+        }
+
+        debug_mutex_clear_owner(lock);
+
+        spin_unlock_mutex(&lock->wait_lock);
+}
+
+/*
+ * Here come the less common (and hence less performance-critical) APIs:
+ * mutex_lock_interruptible() and mutex_trylock().
+ */
+static int fastcall noinline __sched
+__mutex_lock_interruptible_slowpath(atomic_t *lock_count __IP_DECL__);
+
+/***
+ * mutex_lock_interruptible - acquire the mutex, interruptable
+ * @lock: the mutex to be acquired
+ *
+ * Lock the mutex like mutex_lock(), and return 0 if the mutex has
+ * been acquired or sleep until the mutex becomes available. If a
+ * signal arrives while waiting for the lock then this function
+ * returns -EINTR.
+ *
+ * This function is similar to (but not equivalent to) down_interruptible().
+ */
+int fastcall __sched mutex_lock_interruptible(struct mutex *lock)
+{
+        /* NOTE: no other code must be here - see mutex_lock() */
+        return __mutex_fastpath_lock_retval
+                        (&lock->count, __mutex_lock_interruptible_slowpath);
+}
+
+EXPORT_SYMBOL(mutex_lock_interruptible);
+
+static int fastcall noinline __sched
+__mutex_lock_interruptible_slowpath(atomic_t *lock_count __IP_DECL__)
+{
+        struct mutex *lock = container_of(lock_count, struct mutex, count);
+
+        return __mutex_lock_common(lock, TASK_INTERRUPTIBLE __IP__);
+}
+
+/*
+ * Spinlock based trylock, we take the spinlock and check whether we
+ * can get the lock:
+ */
+static inline int __mutex_trylock_slowpath(atomic_t *lock_count)
+{
+        struct mutex *lock = container_of(lock_count, struct mutex, count);
+        int prev;
+
+        spin_lock_mutex(&lock->wait_lock);
+
+        prev = atomic_xchg(&lock->count, -1);
+        if (likely(prev == 1))
+                debug_mutex_set_owner(lock, current_thread_info() __RET_IP__);
+        /* Set it back to 0 if there are no waiters: */
+        if (likely(list_empty(&lock->wait_list)))
+                atomic_set(&lock->count, 0);
+
+        spin_unlock_mutex(&lock->wait_lock);
+
+        return prev == 1;
+}
+
+/***
+ * mutex_trylock - try acquire the mutex, without waiting
+ * @lock: the mutex to be acquired
+ *
+ * Try to acquire the mutex atomically. Returns 1 if the mutex
+ * has been acquired successfully, and 0 on contention.
+ *
+ * NOTE: this function follows the spin_trylock() convention, so
+ * it is negated to the down_trylock() return values! Be careful
+ * about this when converting semaphore users to mutexes.
+ *
+ * This function must not be used in interrupt context. The
+ * mutex must be released by the same task that acquired it.
+ */
+int fastcall mutex_trylock(struct mutex *lock)
+{
+        return __mutex_fastpath_trylock(&lock->count,
+                                        __mutex_trylock_slowpath);
+}
+
+EXPORT_SYMBOL(mutex_trylock);
+
+
+
diff --git a/kernel/mutex.h b/kernel/mutex.h
new file mode 100644
index 000000000000..00fe84e7b672
--- /dev/null
+++ b/kernel/mutex.h
@@ -0,0 +1,35 @@
+/*
+ * Mutexes: blocking mutual exclusion locks
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * This file contains mutex debugging related internal prototypes, for the
+ * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
+ */
+
+#define spin_lock_mutex(lock)                   spin_lock(lock)
+#define spin_unlock_mutex(lock)                 spin_unlock(lock)
+#define mutex_remove_waiter(lock, waiter, ti) \
+                __list_del((waiter)->list.prev, (waiter)->list.next)
+
+#define DEBUG_WARN_ON(c)                                do { } while (0)
+#define debug_mutex_set_owner(lock, new_owner)          do { } while (0)
+#define debug_mutex_clear_owner(lock)                   do { } while (0)
+#define debug_mutex_init_waiter(waiter)                 do { } while (0)
+#define debug_mutex_wake_waiter(lock, waiter)           do { } while (0)
+#define debug_mutex_free_waiter(waiter)                 do { } while (0)
+#define debug_mutex_add_waiter(lock, waiter, ti, ip)    do { } while (0)
+#define debug_mutex_unlock(lock)                        do { } while (0)
+#define debug_mutex_init(lock, name)                    do { } while (0)
+
+/*
+ * Return-address parameters/declarations. They are very useful for
+ * debugging, but add overhead in the !DEBUG case - so we go the
+ * trouble of using this not too elegant but zero-cost solution:
+ */
+#define __IP_DECL__
+#define __IP__
+#define __RET_IP__
+
diff --git a/kernel/sched.c b/kernel/sched.c
index 92733091154c..34a945bcc022 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4386,6 +4386,7 @@ void show_state(void)
         } while_each_thread(g, p);
 
         read_unlock(&tasklist_lock);
+        mutex_debug_show_all_locks();
 }
 
 /**
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c48260fb8fd9..1fcd856edec1 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -95,6 +95,14 @@ config DEBUG_PREEMPT
           if kernel code uses it in a preemption-unsafe way. Also, the kernel
           will detect preemption count underflows.
 
+config DEBUG_MUTEXES
+        bool "Mutex debugging, deadlock detection"
+        default y
+        depends on DEBUG_KERNEL
+        help
+         This allows mutex semantics violations and mutex related deadlocks
+         (lockups) to be detected and reported automatically.
+
 config DEBUG_SPINLOCK
         bool "Spinlock debugging"
         depends on DEBUG_KERNEL
diff --git a/mm/filemap.c b/mm/filemap.c
index 478f4c74cc31..5fca2737c971 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -61,7 +61,7 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *      ->swap_lock             (exclusive_swap_page, others)
  *        ->mapping->tree_lock
  *
- *  ->i_sem
+ *  ->i_mutex
  *    ->i_mmap_lock             (truncate->unmap_mapping_range)
  *
  *  ->mmap_sem
@@ -73,9 +73,9 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
  *    ->lock_page               (access_process_vm)
  *
  *  ->mmap_sem
- *    ->i_sem                   (msync)
+ *    ->i_mutex                 (msync)
  *
- *  ->i_sem
+ *  ->i_mutex
  *    ->i_alloc_sem             (various)
  *
  *  ->inode_lock
@@ -276,7 +276,7 @@ static int wait_on_page_writeback_range(struct address_space *mapping,
  * integrity" operation.  It waits upon in-flight writeout before starting and
  * waiting upon new writeout.  If there was an IO error, return it.
  *
- * We need to re-take i_sem during the generic_osync_inode list walk because
+ * We need to re-take i_mutex during the generic_osync_inode list walk because
  * it is otherwise livelockable.
  */
 int sync_page_range(struct inode *inode, struct address_space *mapping,
@@ -290,9 +290,9 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
                 return 0;
         ret = filemap_fdatawrite_range(mapping, pos, pos + count - 1);
         if (ret == 0) {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 ret = generic_osync_inode(inode, mapping, OSYNC_METADATA);
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         if (ret == 0)
                 ret = wait_on_page_writeback_range(mapping, start, end);
@@ -301,7 +301,7 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
 EXPORT_SYMBOL(sync_page_range);
 
 /*
- * Note: Holding i_sem across sync_page_range_nolock is not a good idea
+ * Note: Holding i_mutex across sync_page_range_nolock is not a good idea
  * as it forces O_SYNC writers to different parts of the same file
  * to be serialised right until io completion.
  */
@@ -1892,7 +1892,7 @@ generic_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
         /*
          * Sync the fs metadata but not the minor inode changes and
          * of course not the data as we did direct DMA for the IO.
-         * i_sem is held, which protects generic_osync_inode() from
+         * i_mutex is held, which protects generic_osync_inode() from
          * livelocking.
          */
         if (written >= 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
@@ -2195,10 +2195,10 @@ ssize_t generic_file_aio_write(struct kiocb *iocb, const char __user *buf,
 
         BUG_ON(iocb->ki_pos != pos);
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         ret = __generic_file_aio_write_nolock(iocb, &local_iov, 1,
                                                 &iocb->ki_pos);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
                 ssize_t err;
@@ -2220,9 +2220,9 @@ ssize_t generic_file_write(struct file *file, const char __user *buf,
         struct iovec local_iov = { .iov_base = (void __user *)buf,
                                         .iov_len = count };
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         ret = __generic_file_write_nolock(file, &local_iov, 1, ppos);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
                 ssize_t err;
@@ -2256,9 +2256,9 @@ ssize_t generic_file_writev(struct file *file, const struct iovec *iov,
         struct inode *inode = mapping->host;
         ssize_t ret;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         ret = __generic_file_write_nolock(file, iov, nr_segs, ppos);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         if (ret > 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
                 int err;
@@ -2272,7 +2272,7 @@ ssize_t generic_file_writev(struct file *file, const struct iovec *iov,
 EXPORT_SYMBOL(generic_file_writev);
 
 /*
- * Called under i_sem for writes to S_ISREG files.   Returns -EIO if something
+ * Called under i_mutex for writes to S_ISREG files.   Returns -EIO if something
  * went wrong during pagecache shootdown.
  */
 static ssize_t
diff --git a/mm/filemap_xip.c b/mm/filemap_xip.c
index 9cf687e4a29a..e2b34e95913e 100644
--- a/mm/filemap_xip.c
+++ b/mm/filemap_xip.c
@@ -338,7 +338,7 @@ __xip_file_write(struct file *filp, const char __user *buf,
         *ppos = pos;
         /*
          * No need to use i_size_read() here, the i_size
-         * cannot change under us because we hold i_sem.
+         * cannot change under us because we hold i_mutex.
          */
         if (pos > inode->i_size) {
                 i_size_write(inode, pos);
@@ -358,7 +358,7 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len,
         loff_t pos;
         ssize_t ret;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 
         if (!access_ok(VERIFY_READ, buf, len)) {
                 ret=-EFAULT;
@@ -390,7 +390,7 @@ xip_file_write(struct file *filp, const char __user *buf, size_t len,
  out_backing:
         current->backing_dev_info = NULL;
  out_up:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return ret;
 }
 EXPORT_SYMBOL_GPL(xip_file_write);
diff --git a/mm/memory.c b/mm/memory.c
index 3944fec38012..7a11ddd5060f 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1784,13 +1784,13 @@ int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
         if (!inode->i_op || !inode->i_op->truncate_range)
                 return -ENOSYS;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         down_write(&inode->i_alloc_sem);
         unmap_mapping_range(mapping, offset, (end - offset), 1);
         truncate_inode_pages_range(mapping, offset, end);
         inode->i_op->truncate_range(inode, offset, end);
         up_write(&inode->i_alloc_sem);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 
         return 0;
 }
diff --git a/mm/msync.c b/mm/msync.c
index 1b5b6f662dcf..3563a56e1a51 100644
--- a/mm/msync.c
+++ b/mm/msync.c
@@ -137,7 +137,7 @@ static int msync_interval(struct vm_area_struct *vma,
                         ret = filemap_fdatawrite(mapping);
                         if (file->f_op && file->f_op->fsync) {
                                 /*
-                                 * We don't take i_sem here because mmap_sem
+                                 * We don't take i_mutex here because mmap_sem
                                  * is already held.
                                  */
                                 err = file->f_op->fsync(file,file->f_dentry,1);
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index e0e84924171b..a5e6891f7bb6 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -415,6 +415,9 @@ static void __free_pages_ok(struct page *page, unsigned int order)
         int reserved = 0;
 
         arch_free_page(page, order);
+        if (!PageHighMem(page))
+                mutex_debug_check_no_locks_freed(page_address(page),
+                        page_address(page+(1<<order)));
 
 #ifndef CONFIG_MMU
         for (i = 1 ; i < (1 << order) ; ++i)
diff --git a/mm/rmap.c b/mm/rmap.c
index 66ec43053a4d..dfbb89f99a15 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -20,13 +20,13 @@
 /*
  * Lock ordering in mm:
  *
- * inode->i_sem (while writing or truncating, not reading or faulting)
+ * inode->i_mutex       (while writing or truncating, not reading or faulting)
  *   inode->i_alloc_sem
  *
  * When a page fault occurs in writing from user to file, down_read
- * of mmap_sem nests within i_sem; in sys_msync, i_sem nests within
- * down_read of mmap_sem; i_sem and down_write of mmap_sem are never
- * taken together; in truncation, i_sem is taken outermost.
+ * of mmap_sem nests within i_mutex; in sys_msync, i_mutex nests within
+ * down_read of mmap_sem; i_mutex and down_write of mmap_sem are never
+ * taken together; in truncation, i_mutex is taken outermost.
  *
  * mm->mmap_sem
  *   page->flags PG_locked (lock_page)
diff --git a/mm/shmem.c b/mm/shmem.c
index a1f2f02af724..343b3c0937e5 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -1370,7 +1370,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t
         if (!access_ok(VERIFY_READ, buf, count))
                 return -EFAULT;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
 
         pos = *ppos;
         written = 0;
@@ -1455,7 +1455,7 @@ shmem_file_write(struct file *file, const char __user *buf, size_t count, loff_t
         if (written)
                 err = written;
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return err;
 }
 
@@ -1491,7 +1491,7 @@ static void do_shmem_file_read(struct file *filp, loff_t *ppos, read_descriptor_
 
                 /*
                  * We must evaluate after, since reads (unlike writes)
-                 * are called without i_sem protection against truncate
+                 * are called without i_mutex protection against truncate
                  */
                 nr = PAGE_CACHE_SIZE;
                 i_size = i_size_read(inode);
diff --git a/mm/slab.c b/mm/slab.c
index 1c46c6383552..33aab345cd4a 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3071,6 +3071,7 @@ void kfree(const void *objp)
         local_irq_save(flags);
         kfree_debugcheck(objp);
         c = page_get_cache(virt_to_page(objp));
+        mutex_debug_check_no_locks_freed(objp, objp+obj_reallen(c));
         __cache_free(c, (void *)objp);
         local_irq_restore(flags);
 }
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 80f948a2028b..6544565a7c0f 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -1187,9 +1187,9 @@ asmlinkage long sys_swapoff(const char __user * specialfile)
                 set_blocksize(bdev, p->old_block_size);
                 bd_release(bdev);
         } else {
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 inode->i_flags &= ~S_SWAPFILE;
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         filp_close(swap_file, NULL);
         err = 0;
@@ -1406,7 +1406,7 @@ asmlinkage long sys_swapon(const char __user * specialfile, int swap_flags)
                 p->bdev = bdev;
         } else if (S_ISREG(inode->i_mode)) {
                 p->bdev = inode->i_sb->s_bdev;
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 did_down = 1;
                 if (IS_SWAPFILE(inode)) {
                         error = -EBUSY;
@@ -1596,7 +1596,7 @@ out:
         if (did_down) {
                 if (!error)
                         inode->i_flags |= S_SWAPFILE;
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         return error;
 }
diff --git a/mm/truncate.c b/mm/truncate.c
index b1a463d0fe71..6cb3fff25f67 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -196,7 +196,7 @@ EXPORT_SYMBOL(truncate_inode_pages_range);
  * @mapping: mapping to truncate
  * @lstart: offset from which to truncate
  *
- * Called under (and serialised by) inode->i_sem.
+ * Called under (and serialised by) inode->i_mutex.
  */
 void truncate_inode_pages(struct address_space *mapping, loff_t lstart)
 {
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c
index e14c1cae7460..9764c80ab0b2 100644
--- a/net/sunrpc/rpc_pipe.c
+++ b/net/sunrpc/rpc_pipe.c
@@ -69,13 +69,13 @@ rpc_timeout_upcall_queue(void *data)
         struct rpc_inode *rpci = (struct rpc_inode *)data;
         struct inode *inode = &rpci->vfs_inode;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops == NULL)
                 goto out;
         if (rpci->nreaders == 0 && !list_empty(&rpci->pipe))
                 __rpc_purge_upcall(inode, -ETIMEDOUT);
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
 }
 
 int
@@ -84,7 +84,7 @@ rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
         struct rpc_inode *rpci = RPC_I(inode);
         int res = -EPIPE;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops == NULL)
                 goto out;
         if (rpci->nreaders) {
@@ -100,7 +100,7 @@ rpc_queue_upcall(struct inode *inode, struct rpc_pipe_msg *msg)
                 res = 0;
         }
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         wake_up(&rpci->waitq);
         return res;
 }
@@ -116,7 +116,7 @@ rpc_close_pipes(struct inode *inode)
 {
         struct rpc_inode *rpci = RPC_I(inode);
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops != NULL) {
                 rpci->nreaders = 0;
                 __rpc_purge_list(rpci, &rpci->in_upcall, -EPIPE);
@@ -127,7 +127,7 @@ rpc_close_pipes(struct inode *inode)
                 rpci->ops = NULL;
         }
         rpc_inode_setowner(inode, NULL);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         cancel_delayed_work(&rpci->queue_timeout);
         flush_scheduled_work();
 }
@@ -154,7 +154,7 @@ rpc_pipe_open(struct inode *inode, struct file *filp)
         struct rpc_inode *rpci = RPC_I(inode);
         int res = -ENXIO;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops != NULL) {
                 if (filp->f_mode & FMODE_READ)
                         rpci->nreaders ++;
@@ -162,7 +162,7 @@ rpc_pipe_open(struct inode *inode, struct file *filp)
                         rpci->nwriters ++;
                 res = 0;
         }
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return res;
 }
 
@@ -172,7 +172,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
         struct rpc_inode *rpci = RPC_I(inode);
         struct rpc_pipe_msg *msg;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops == NULL)
                 goto out;
         msg = (struct rpc_pipe_msg *)filp->private_data;
@@ -190,7 +190,7 @@ rpc_pipe_release(struct inode *inode, struct file *filp)
         if (rpci->ops->release_pipe)
                 rpci->ops->release_pipe(inode);
 out:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return 0;
 }
 
@@ -202,7 +202,7 @@ rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
         struct rpc_pipe_msg *msg;
         int res = 0;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         if (rpci->ops == NULL) {
                 res = -EPIPE;
                 goto out_unlock;
@@ -229,7 +229,7 @@ rpc_pipe_read(struct file *filp, char __user *buf, size_t len, loff_t *offset)
                 rpci->ops->destroy_msg(msg);
         }
 out_unlock:
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return res;
 }
 
@@ -240,11 +240,11 @@ rpc_pipe_write(struct file *filp, const char __user *buf, size_t len, loff_t *of
         struct rpc_inode *rpci = RPC_I(inode);
         int res;
 
-        down(&inode->i_sem);
+        mutex_lock(&inode->i_mutex);
         res = -EPIPE;
         if (rpci->ops != NULL)
                 res = rpci->ops->downcall(filp, buf, len);
-        up(&inode->i_sem);
+        mutex_unlock(&inode->i_mutex);
         return res;
 }
 
@@ -322,7 +322,7 @@ rpc_info_open(struct inode *inode, struct file *file)
 
         if (!ret) {
                 struct seq_file *m = file->private_data;
-                down(&inode->i_sem);
+                mutex_lock(&inode->i_mutex);
                 clnt = RPC_I(inode)->private;
                 if (clnt) {
                         atomic_inc(&clnt->cl_users);
@@ -331,7 +331,7 @@ rpc_info_open(struct inode *inode, struct file *file)
                         single_release(inode, file);
                         ret = -EINVAL;
                 }
-                up(&inode->i_sem);
+                mutex_unlock(&inode->i_mutex);
         }
         return ret;
 }
@@ -491,7 +491,7 @@ rpc_depopulate(struct dentry *parent)
         struct dentry *dentry, *dvec[10];
         int n = 0;
 
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
 repeat:
         spin_lock(&dcache_lock);
         list_for_each_safe(pos, next, &parent->d_subdirs) {
@@ -519,7 +519,7 @@ repeat:
                 } while (n);
                 goto repeat;
         }
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
 }
 
 static int
@@ -532,7 +532,7 @@ rpc_populate(struct dentry *parent,
         struct dentry *dentry;
         int mode, i;
 
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
         for (i = start; i < eof; i++) {
                 dentry = d_alloc_name(parent, files[i].name);
                 if (!dentry)
@@ -552,10 +552,10 @@ rpc_populate(struct dentry *parent,
                         dir->i_nlink++;
                 d_add(dentry, inode);
         }
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         return 0;
 out_bad:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         printk(KERN_WARNING "%s: %s failed to populate directory %s\n",
                         __FILE__, __FUNCTION__, parent->d_name.name);
         return -ENOMEM;
@@ -609,7 +609,7 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
         if ((error = rpc_lookup_parent(path, nd)) != 0)
                 return ERR_PTR(error);
         dir = nd->dentry->d_inode;
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
         dentry = lookup_hash(nd);
         if (IS_ERR(dentry))
                 goto out_err;
@@ -620,7 +620,7 @@ rpc_lookup_negative(char *path, struct nameidata *nd)
         }
         return dentry;
 out_err:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         rpc_release_path(nd);
         return dentry;
 }
@@ -646,7 +646,7 @@ rpc_mkdir(char *path, struct rpc_clnt *rpc_client)
         if (error)
                 goto err_depopulate;
 out:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         rpc_release_path(&nd);
         return dentry;
 err_depopulate:
@@ -671,7 +671,7 @@ rpc_rmdir(char *path)
         if ((error = rpc_lookup_parent(path, &nd)) != 0)
                 return error;
         dir = nd.dentry->d_inode;
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
         dentry = lookup_hash(&nd);
         if (IS_ERR(dentry)) {
                 error = PTR_ERR(dentry);
@@ -681,7 +681,7 @@ rpc_rmdir(char *path)
         error = __rpc_rmdir(dir, dentry);
         dput(dentry);
 out_release:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         rpc_release_path(&nd);
         return error;
 }
@@ -710,7 +710,7 @@ rpc_mkpipe(char *path, void *private, struct rpc_pipe_ops *ops, int flags)
         rpci->ops = ops;
         inode_dir_notify(dir, DN_CREATE);
 out:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         rpc_release_path(&nd);
         return dentry;
 err_dput:
@@ -732,7 +732,7 @@ rpc_unlink(char *path)
         if ((error = rpc_lookup_parent(path, &nd)) != 0)
                 return error;
         dir = nd.dentry->d_inode;
-        down(&dir->i_sem);
+        mutex_lock(&dir->i_mutex);
         dentry = lookup_hash(&nd);
         if (IS_ERR(dentry)) {
                 error = PTR_ERR(dentry);
@@ -746,7 +746,7 @@ rpc_unlink(char *path)
         dput(dentry);
         inode_dir_notify(dir, DN_DELETE);
 out_release:
-        up(&dir->i_sem);
+        mutex_unlock(&dir->i_mutex);
         rpc_release_path(&nd);
         return error;
 }
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 5f6ae79b8b16..1b5989b1b670 100644
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -784,7 +784,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                 err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0);
                 if (err)
                         goto out_mknod_dput;
-                up(&nd.dentry->d_inode->i_sem);
+                mutex_unlock(&nd.dentry->d_inode->i_mutex);
                 dput(nd.dentry);
                 nd.dentry = dentry;
 
@@ -823,7 +823,7 @@ out:
 out_mknod_dput:
         dput(dentry);
 out_mknod_unlock:
-        up(&nd.dentry->d_inode->i_sem);
+        mutex_unlock(&nd.dentry->d_inode->i_mutex);
         path_release(&nd);
 out_mknod_parent:
         if (err==-EEXIST)
diff --git a/security/inode.c b/security/inode.c
index a5964502ae30..0f77b0223662 100644
--- a/security/inode.c
+++ b/security/inode.c
@@ -172,7 +172,7 @@ static int create_by_name(const char *name, mode_t mode,
                 return -EFAULT;
         }
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         *dentry = lookup_one_len(name, parent, strlen(name));
         if (!IS_ERR(dentry)) {
                 if ((mode & S_IFMT) == S_IFDIR)
@@ -181,7 +181,7 @@ static int create_by_name(const char *name, mode_t mode,
                         error = create(parent->d_inode, *dentry, mode);
         } else
                 error = PTR_ERR(dentry);
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
 
         return error;
 }
@@ -302,7 +302,7 @@ void securityfs_remove(struct dentry *dentry)
         if (!parent || !parent->d_inode)
                 return;
 
-        down(&parent->d_inode->i_sem);
+        mutex_lock(&parent->d_inode->i_mutex);
         if (positive(dentry)) {
                 if (dentry->d_inode) {
                         if (S_ISDIR(dentry->d_inode->i_mode))
@@ -312,7 +312,7 @@ void securityfs_remove(struct dentry *dentry)
                         dput(dentry);
                 }
         }
-        up(&parent->d_inode->i_sem);
+        mutex_unlock(&parent->d_inode->i_mutex);
         simple_release_fs(&mount, &mount_count);
 }
 EXPORT_SYMBOL_GPL(securityfs_remove);
diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 16df1246a131..7fd072392c7e 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -2135,9 +2135,7 @@ static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size
         substream = pcm_oss_file->streams[SNDRV_PCM_STREAM_PLAYBACK];
         if (substream == NULL)
                 return -ENXIO;
-        up(&file->f_dentry->d_inode->i_sem);
         result = snd_pcm_oss_write1(substream, buf, count);
-        down(&file->f_dentry->d_inode->i_sem);
 #ifdef OSS_DEBUG
         printk("pcm_oss: write %li bytes (wrote %li bytes)\n", (long)count, (long)result);
 #endif
diff --git a/sound/core/seq/seq_memory.c b/sound/core/seq/seq_memory.c
index 9ee6c177db0c..40b4f679c80e 100644
--- a/sound/core/seq/seq_memory.c
+++ b/sound/core/seq/seq_memory.c
@@ -32,10 +32,6 @@
 #include "seq_info.h"
 #include "seq_lock.h"
 
-/* semaphore in struct file record */
-#define semaphore_of(fp)        ((fp)->f_dentry->d_inode->i_sem)
-
-
 static inline int snd_seq_pool_available(struct snd_seq_pool *pool)
 {
         return pool->total_elements - atomic_read(&pool->counter);