Automatic merge with /usr/src/ntfs-2.6.git.

9 files changed, 525 insertions, 63 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index eeb4522524..2d4d4e3bc4 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -40,6 +40,12 @@ config ZLIB_DEFLATE
         tristate
 
 #
+# Generic allocator support is selected if needed
+#
+config GENERIC_ALLOCATOR
+        boolean
+
+#
 # reed solomon support is select'ed if needed
 #
 config REED_SOLOMON
diff --git a/lib/Makefile b/lib/Makefile
index 7c70db79c0..dcb4231916 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -4,9 +4,10 @@
 
 lib-y := errno.o ctype.o string.o vsprintf.o cmdline.o \
          bust_spinlocks.o rbtree.o radix-tree.o dump_stack.o \
-         kobject.o kref.o idr.o div64.o int_sqrt.o \
-         bitmap.o extable.o kobject_uevent.o prio_tree.o sha1.o \
-         halfmd4.o
+         idr.o div64.o int_sqrt.o bitmap.o extable.o prio_tree.o \
+         sha1.o halfmd4.o
+
+lib-y   += kobject.o kref.o kobject_uevent.o klist.o
 
 obj-y += sort.o parser.o
 
@@ -19,6 +20,7 @@ lib-$(CONFIG_RWSEM_GENERIC_SPINLOCK) += rwsem-spinlock.o
 lib-$(CONFIG_RWSEM_XCHGADD_ALGORITHM) += rwsem.o
 lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
 obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o
+obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
 
 ifneq ($(CONFIG_HAVE_DEC_LOCK),y) 
   lib-y += dec_and_lock.o
@@ -28,6 +30,7 @@ obj-$(CONFIG_CRC_CCITT)	+= crc-ccitt.o
 obj-$(CONFIG_CRC32)     += crc32.o
 obj-$(CONFIG_LIBCRC32C) += libcrc32c.o
 obj-$(CONFIG_GENERIC_IOMAP) += iomap.o
+obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
 
 obj-$(CONFIG_ZLIB_INFLATE) += zlib_inflate/
 obj-$(CONFIG_ZLIB_DEFLATE) += zlib_deflate/
diff --git a/lib/genalloc.c b/lib/genalloc.c
new file mode 100644
index 0000000000..d6d30d2e71
--- /dev/null
+++ b/lib/genalloc.c
@@ -0,0 +1,188 @@
+/*
+ * Basic general purpose allocator for managing special purpose memory
+ * not managed by the regular kmalloc/kfree interface.
+ * Uses for this includes on-device special memory, uncached memory
+ * etc.
+ *
+ * This code is based on the buddy allocator found in the sym53c8xx_2
+ * driver Copyright (C) 1999-2001  Gerard Roudier <groudier@free.fr>,
+ * and adapted for general purpose use.
+ *
+ * Copyright 2005 (C) Jes Sorensen <jes@trained-monkey.org>
+ *
+ * This source code is licensed under the GNU General Public License,
+ * Version 2.  See the file COPYING for more details.
+ */
+
+#include <linux/module.h>
+#include <linux/stddef.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/mm.h>
+#include <linux/spinlock.h>
+#include <linux/genalloc.h>
+
+#include <asm/page.h>
+
+
+struct gen_pool *gen_pool_create(int nr_chunks, int max_chunk_shift,
+                                 unsigned long (*fp)(struct gen_pool *),
+                                 unsigned long data)
+{
+        struct gen_pool *poolp;
+        unsigned long tmp;
+        int i;
+
+        /*
+         * This is really an arbitrary limit, +10 is enough for
+         * IA64_GRANULE_SHIFT, aka 16MB. If anyone needs a large limit
+         * this can be increased without problems.
+         */
+        if ((max_chunk_shift > (PAGE_SHIFT + 10)) ||
+            ((max_chunk_shift < ALLOC_MIN_SHIFT) && max_chunk_shift))
+                return NULL;
+
+        if (!max_chunk_shift)
+                max_chunk_shift = PAGE_SHIFT;
+
+        poolp = kmalloc(sizeof(struct gen_pool), GFP_KERNEL);
+        if (!poolp)
+                return NULL;
+        memset(poolp, 0, sizeof(struct gen_pool));
+        poolp->h = kmalloc(sizeof(struct gen_pool_link) *
+                           (max_chunk_shift - ALLOC_MIN_SHIFT + 1),
+                           GFP_KERNEL);
+        if (!poolp->h) {
+                printk(KERN_WARNING "gen_pool_alloc() failed to allocate\n");
+                kfree(poolp);
+                return NULL;
+        }
+        memset(poolp->h, 0, sizeof(struct gen_pool_link) *
+               (max_chunk_shift - ALLOC_MIN_SHIFT + 1));
+
+        spin_lock_init(&poolp->lock);
+        poolp->get_new_chunk = fp;
+        poolp->max_chunk_shift = max_chunk_shift;
+        poolp->private = data;
+
+        for (i = 0; i < nr_chunks; i++) {
+                tmp = poolp->get_new_chunk(poolp);
+                printk(KERN_INFO "allocated %lx\n", tmp);
+                if (!tmp)
+                        break;
+                gen_pool_free(poolp, tmp, (1 << poolp->max_chunk_shift));
+        }
+
+        return poolp;
+}
+EXPORT_SYMBOL(gen_pool_create);
+
+
+/*
+ *  Simple power of two buddy-like generic allocator.
+ *  Provides naturally aligned memory chunks.
+ */
+unsigned long gen_pool_alloc(struct gen_pool *poolp, int size)
+{
+        int j, i, s, max_chunk_size;
+        unsigned long a, flags;
+        struct gen_pool_link *h = poolp->h;
+
+        max_chunk_size = 1 << poolp->max_chunk_shift;
+
+        if (size > max_chunk_size)
+                return 0;
+
+        i = 0;
+
+        size = max(size, 1 << ALLOC_MIN_SHIFT);
+        s = roundup_pow_of_two(size);
+
+        j = i;
+
+        spin_lock_irqsave(&poolp->lock, flags);
+        while (!h[j].next) {
+                if (s == max_chunk_size) {
+                        struct gen_pool_link *ptr;
+                        spin_unlock_irqrestore(&poolp->lock, flags);
+                        ptr = (struct gen_pool_link *)poolp->get_new_chunk(poolp);
+                        spin_lock_irqsave(&poolp->lock, flags);
+                        h[j].next = ptr;
+                        if (h[j].next)
+                                h[j].next->next = NULL;
+                        break;
+                }
+                j++;
+                s <<= 1;
+        }
+        a = (unsigned long) h[j].next;
+        if (a) {
+                h[j].next = h[j].next->next;
+                /*
+                 * This should be split into a seperate function doing
+                 * the chunk split in order to support custom
+                 * handling memory not physically accessible by host
+                 */
+                while (j > i) {
+                        j -= 1;
+                        s >>= 1;
+                        h[j].next = (struct gen_pool_link *) (a + s);
+                        h[j].next->next = NULL;
+                }
+        }
+        spin_unlock_irqrestore(&poolp->lock, flags);
+        return a;
+}
+EXPORT_SYMBOL(gen_pool_alloc);
+
+
+/*
+ *  Counter-part of the generic allocator.
+ */
+void gen_pool_free(struct gen_pool *poolp, unsigned long ptr, int size)
+{
+        struct gen_pool_link *q;
+        struct gen_pool_link *h = poolp->h;
+        unsigned long a, b, flags;
+        int i, s, max_chunk_size;
+
+        max_chunk_size = 1 << poolp->max_chunk_shift;
+
+        if (size > max_chunk_size)
+                return;
+
+        i = 0;
+
+        size = max(size, 1 << ALLOC_MIN_SHIFT);
+        s = roundup_pow_of_two(size);
+
+        a = ptr;
+
+        spin_lock_irqsave(&poolp->lock, flags);
+        while (1) {
+                if (s == max_chunk_size) {
+                        ((struct gen_pool_link *)a)->next = h[i].next;
+                        h[i].next = (struct gen_pool_link *)a;
+                        break;
+                }
+                b = a ^ s;
+                q = &h[i];
+
+                while (q->next && q->next != (struct gen_pool_link *)b)
+                        q = q->next;
+
+                if (!q->next) {
+                        ((struct gen_pool_link *)a)->next = h[i].next;
+                        h[i].next = (struct gen_pool_link *)a;
+                        break;
+                }
+                q->next = q->next->next;
+                a = a & b;
+                s <<= 1;
+                i++;
+        }
+        spin_unlock_irqrestore(&poolp->lock, flags);
+}
+EXPORT_SYMBOL(gen_pool_free);
diff --git a/lib/idr.c b/lib/idr.c
index 81fc430602..c5be889de4 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -175,7 +175,7 @@ build_up:
          * Add a new layer to the top of the tree if the requested
          * id is larger than the currently allocated space.
          */
-        while ((layers < MAX_LEVEL) && (id >= (1 << (layers*IDR_BITS)))) {
+        while ((layers < (MAX_LEVEL - 1)) && (id >= (1 << (layers*IDR_BITS)))) {
                 layers++;
                 if (!p->count)
                         continue;
diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
index 99b0ae3d51..bd2bc5d887 100644
--- a/lib/kernel_lock.c
+++ b/lib/kernel_lock.c
@@ -9,61 +9,6 @@
 #include <linux/module.h>
 #include <linux/kallsyms.h>
 
-#if defined(CONFIG_PREEMPT) && defined(__smp_processor_id) && \
-                defined(CONFIG_DEBUG_PREEMPT)
-
-/*
- * Debugging check.
- */
-unsigned int smp_processor_id(void)
-{
-        unsigned long preempt_count = preempt_count();
-        int this_cpu = __smp_processor_id();
-        cpumask_t this_mask;
-
-        if (likely(preempt_count))
-                goto out;
-
-        if (irqs_disabled())
-                goto out;
-
-        /*
-         * Kernel threads bound to a single CPU can safely use
-         * smp_processor_id():
-         */
-        this_mask = cpumask_of_cpu(this_cpu);
-
-        if (cpus_equal(current->cpus_allowed, this_mask))
-                goto out;
-
-        /*
-         * It is valid to assume CPU-locality during early bootup:
-         */
-        if (system_state != SYSTEM_RUNNING)
-                goto out;
-
-        /*
-         * Avoid recursion:
-         */
-        preempt_disable();
-
-        if (!printk_ratelimit())
-                goto out_enable;
-
-        printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current->comm, current->pid);
-        print_symbol("caller is %s\n", (long)__builtin_return_address(0));
-        dump_stack();
-
-out_enable:
-        preempt_enable_no_resched();
-out:
-        return this_cpu;
-}
-
-EXPORT_SYMBOL(smp_processor_id);
-
-#endif /* PREEMPT && __smp_processor_id && DEBUG_PREEMPT */
-
 #ifdef CONFIG_PREEMPT_BKL
 /*
  * The 'big kernel semaphore'
diff --git a/lib/klist.c b/lib/klist.c
new file mode 100644
index 0000000000..738ab81016
--- /dev/null
+++ b/lib/klist.c
@@ -0,0 +1,265 @@
+/*
+ *      klist.c - Routines for manipulating klists.
+ *
+ *
+ *      This klist interface provides a couple of structures that wrap around 
+ *      struct list_head to provide explicit list "head" (struct klist) and 
+ *      list "node" (struct klist_node) objects. For struct klist, a spinlock
+ *      is included that protects access to the actual list itself. struct 
+ *      klist_node provides a pointer to the klist that owns it and a kref
+ *      reference count that indicates the number of current users of that node
+ *      in the list.
+ *
+ *      The entire point is to provide an interface for iterating over a list
+ *      that is safe and allows for modification of the list during the
+ *      iteration (e.g. insertion and removal), including modification of the
+ *      current node on the list.
+ *
+ *      It works using a 3rd object type - struct klist_iter - that is declared
+ *      and initialized before an iteration. klist_next() is used to acquire the
+ *      next element in the list. It returns NULL if there are no more items.
+ *      Internally, that routine takes the klist's lock, decrements the reference
+ *      count of the previous klist_node and increments the count of the next
+ *      klist_node. It then drops the lock and returns.
+ *
+ *      There are primitives for adding and removing nodes to/from a klist. 
+ *      When deleting, klist_del() will simply decrement the reference count. 
+ *      Only when the count goes to 0 is the node removed from the list. 
+ *      klist_remove() will try to delete the node from the list and block
+ *      until it is actually removed. This is useful for objects (like devices)
+ *      that have been removed from the system and must be freed (but must wait
+ *      until all accessors have finished).
+ *
+ *      Copyright (C) 2005 Patrick Mochel
+ *
+ *      This file is released under the GPL v2.
+ */
+
+#include <linux/klist.h>
+#include <linux/module.h>
+
+
+/**
+ *      klist_init - Initialize a klist structure. 
+ *      @k:     The klist we're initializing.
+ */
+
+void klist_init(struct klist * k)
+{
+        INIT_LIST_HEAD(&k->k_list);
+        spin_lock_init(&k->k_lock);
+}
+
+EXPORT_SYMBOL_GPL(klist_init);
+
+
+static void add_head(struct klist * k, struct klist_node * n)
+{
+        spin_lock(&k->k_lock);
+        list_add(&n->n_node, &k->k_list);
+        spin_unlock(&k->k_lock);
+}
+
+static void add_tail(struct klist * k, struct klist_node * n)
+{
+        spin_lock(&k->k_lock);
+        list_add_tail(&n->n_node, &k->k_list);
+        spin_unlock(&k->k_lock);
+}
+
+
+static void klist_node_init(struct klist * k, struct klist_node * n)
+{
+        INIT_LIST_HEAD(&n->n_node);
+        init_completion(&n->n_removed);
+        kref_init(&n->n_ref);
+        n->n_klist = k;
+}
+
+
+/**
+ *      klist_add_head - Initialize a klist_node and add it to front.
+ *      @k:     klist it's going on.
+ *      @n:     node we're adding.
+ */
+
+void klist_add_head(struct klist * k, struct klist_node * n)
+{
+        klist_node_init(k, n);
+        add_head(k, n);
+}
+
+EXPORT_SYMBOL_GPL(klist_add_head);
+
+
+/**
+ *      klist_add_tail - Initialize a klist_node and add it to back.
+ *      @k:     klist it's going on.
+ *      @n:     node we're adding.
+ */
+
+void klist_add_tail(struct klist * k, struct klist_node * n)
+{
+        klist_node_init(k, n);
+        add_tail(k, n);
+}
+
+EXPORT_SYMBOL_GPL(klist_add_tail);
+
+
+static void klist_release(struct kref * kref)
+{
+        struct klist_node * n = container_of(kref, struct klist_node, n_ref);
+        list_del(&n->n_node);
+        complete(&n->n_removed);
+        n->n_klist = NULL;
+}
+
+static int klist_dec_and_del(struct klist_node * n)
+{
+        return kref_put(&n->n_ref, klist_release);
+}
+
+
+/**
+ *      klist_del - Decrement the reference count of node and try to remove.
+ *      @n:     node we're deleting.
+ */
+
+void klist_del(struct klist_node * n)
+{
+        struct klist * k = n->n_klist;
+
+        spin_lock(&k->k_lock);
+        klist_dec_and_del(n);
+        spin_unlock(&k->k_lock);
+}
+
+EXPORT_SYMBOL_GPL(klist_del);
+
+
+/**
+ *      klist_remove - Decrement the refcount of node and wait for it to go away.
+ *      @n:     node we're removing.
+ */
+
+void klist_remove(struct klist_node * n)
+{
+        struct klist * k = n->n_klist;
+        spin_lock(&k->k_lock);
+        klist_dec_and_del(n);
+        spin_unlock(&k->k_lock);
+        wait_for_completion(&n->n_removed);
+}
+
+EXPORT_SYMBOL_GPL(klist_remove);
+
+
+/**
+ *      klist_node_attached - Say whether a node is bound to a list or not.
+ *      @n:     Node that we're testing.
+ */
+
+int klist_node_attached(struct klist_node * n)
+{
+        return (n->n_klist != NULL);
+}
+
+EXPORT_SYMBOL_GPL(klist_node_attached);
+
+
+/**
+ *      klist_iter_init_node - Initialize a klist_iter structure.
+ *      @k:     klist we're iterating.
+ *      @i:     klist_iter we're filling.
+ *      @n:     node to start with.
+ *
+ *      Similar to klist_iter_init(), but starts the action off with @n, 
+ *      instead of with the list head.
+ */
+
+void klist_iter_init_node(struct klist * k, struct klist_iter * i, struct klist_node * n)
+{
+        i->i_klist = k;
+        i->i_head = &k->k_list;
+        i->i_cur = n;
+}
+
+EXPORT_SYMBOL_GPL(klist_iter_init_node);
+
+
+/**
+ *      klist_iter_init - Iniitalize a klist_iter structure.
+ *      @k:     klist we're iterating.
+ *      @i:     klist_iter structure we're filling.
+ *
+ *      Similar to klist_iter_init_node(), but start with the list head.
+ */
+
+void klist_iter_init(struct klist * k, struct klist_iter * i)
+{
+        klist_iter_init_node(k, i, NULL);
+}
+
+EXPORT_SYMBOL_GPL(klist_iter_init);
+
+
+/**
+ *      klist_iter_exit - Finish a list iteration.
+ *      @i:     Iterator structure.
+ *
+ *      Must be called when done iterating over list, as it decrements the 
+ *      refcount of the current node. Necessary in case iteration exited before
+ *      the end of the list was reached, and always good form.
+ */
+
+void klist_iter_exit(struct klist_iter * i)
+{
+        if (i->i_cur) {
+                klist_del(i->i_cur);
+                i->i_cur = NULL;
+        }
+}
+
+EXPORT_SYMBOL_GPL(klist_iter_exit);
+
+
+static struct klist_node * to_klist_node(struct list_head * n)
+{
+        return container_of(n, struct klist_node, n_node);
+}
+
+
+/**
+ *      klist_next - Ante up next node in list.
+ *      @i:     Iterator structure.
+ *
+ *      First grab list lock. Decrement the reference count of the previous
+ *      node, if there was one. Grab the next node, increment its reference 
+ *      count, drop the lock, and return that next node.
+ */
+
+struct klist_node * klist_next(struct klist_iter * i)
+{
+        struct list_head * next;
+        struct klist_node * knode = NULL;
+
+        spin_lock(&i->i_klist->k_lock);
+        if (i->i_cur) {
+                next = i->i_cur->n_node.next;
+                klist_dec_and_del(i->i_cur);
+        } else
+                next = i->i_head->next;
+
+        if (next != i->i_head) {
+                knode = to_klist_node(next);
+                kref_get(&knode->n_ref);
+        }
+        i->i_cur = knode;
+        spin_unlock(&i->i_klist->k_lock);
+        return knode;
+}
+
+EXPORT_SYMBOL_GPL(klist_next);
+
+
diff --git a/lib/kobject.c b/lib/kobject.c
index 9404882662..dd0917dd9f 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -279,7 +279,7 @@ EXPORT_SYMBOL(kobject_set_name);
  *      @new_name: object's new name
  */
 
-int kobject_rename(struct kobject * kobj, char *new_name)
+int kobject_rename(struct kobject * kobj, const char *new_name)
 {
         int error = 0;
 
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 2a4e7671ea..8e49d21057 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -197,7 +197,7 @@ void kobject_hotplug(struct kobject *kobj, enum kobject_action action)
         int i = 0;
         int retval;
         char *kobj_path = NULL;
-        char *name = NULL;
+        const char *name = NULL;
         char *action_string;
         u64 seq;
         struct kobject *top_kobj = kobj;
@@ -246,10 +246,10 @@ void kobject_hotplug(struct kobject *kobj, enum kobject_action action)
         if (hotplug_ops->name)
                 name = hotplug_ops->name(kset, kobj);
         if (name == NULL)
-                name = kset->kobj.name;
+                name = kobject_name(&kset->kobj);
 
         argv [0] = hotplug_path;
-        argv [1] = name;
+        argv [1] = (char *)name; /* won't be changed but 'const' has to go */
         argv [2] = NULL;
 
         /* minimal command environment */
diff --git a/lib/smp_processor_id.c b/lib/smp_processor_id.c
new file mode 100644
index 0000000000..42c08ef828
--- /dev/null
+++ b/lib/smp_processor_id.c
@@ -0,0 +1,55 @@
+/*
+ * lib/smp_processor_id.c
+ *
+ * DEBUG_PREEMPT variant of smp_processor_id().
+ */
+#include <linux/module.h>
+#include <linux/kallsyms.h>
+
+unsigned int debug_smp_processor_id(void)
+{
+        unsigned long preempt_count = preempt_count();
+        int this_cpu = raw_smp_processor_id();
+        cpumask_t this_mask;
+
+        if (likely(preempt_count))
+                goto out;
+
+        if (irqs_disabled())
+                goto out;
+
+        /*
+         * Kernel threads bound to a single CPU can safely use
+         * smp_processor_id():
+         */
+        this_mask = cpumask_of_cpu(this_cpu);
+
+        if (cpus_equal(current->cpus_allowed, this_mask))
+                goto out;
+
+        /*
+         * It is valid to assume CPU-locality during early bootup:
+         */
+        if (system_state != SYSTEM_RUNNING)
+                goto out;
+
+        /*
+         * Avoid recursion:
+         */
+        preempt_disable();
+
+        if (!printk_ratelimit())
+                goto out_enable;
+
+        printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current->comm, current->pid);
+        print_symbol("caller is %s\n", (long)__builtin_return_address(0));
+        dump_stack();
+
+out_enable:
+        preempt_enable_no_resched();
+out:
+        return this_cpu;
+}
+
+EXPORT_SYMBOL(debug_smp_processor_id);
+