145 files changed, 1549 insertions, 755 deletions

diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index 43c9f7de0314..f867b8d3e973 100644
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -39,8 +39,8 @@
 
 extern struct file_system_type v9fs_fs_type;
 extern struct address_space_operations v9fs_addr_operations;
-extern struct file_operations v9fs_file_operations;
-extern struct file_operations v9fs_dir_operations;
+extern const struct file_operations v9fs_file_operations;
+extern const struct file_operations v9fs_dir_operations;
 extern struct dentry_operations v9fs_dentry_operations;
 
 struct inode *v9fs_get_inode(struct super_block *sb, int mode);
diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index 766f11f1215c..e32d5971039b 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -204,7 +204,7 @@ int v9fs_dir_release(struct inode *inode, struct file *filp)
         return 0;
 }
 
-struct file_operations v9fs_dir_operations = {
+const struct file_operations v9fs_dir_operations = {
         .read = generic_read_dir,
         .readdir = v9fs_dir_readdir,
         .open = v9fs_file_open,
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index 59e744163407..083dcfcd158e 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -266,7 +266,7 @@ v9fs_file_write(struct file *filp, const char __user * data,
         return total;
 }
 
-struct file_operations v9fs_file_operations = {
+const struct file_operations v9fs_file_operations = {
         .llseek = generic_file_llseek,
         .read = v9fs_file_read,
         .write = v9fs_file_write,
diff --git a/fs/adfs/adfs.h b/fs/adfs/adfs.h
index f6cd01352cc8..29217ff36d44 100644
--- a/fs/adfs/adfs.h
+++ b/fs/adfs/adfs.h
@@ -85,7 +85,7 @@ void __adfs_error(struct super_block *sb, const char *function,
 
 /* dir_*.c */
 extern struct inode_operations adfs_dir_inode_operations;
-extern struct file_operations adfs_dir_operations;
+extern const struct file_operations adfs_dir_operations;
 extern struct dentry_operations adfs_dentry_operations;
 extern struct adfs_dir_ops adfs_f_dir_ops;
 extern struct adfs_dir_ops adfs_fplus_dir_ops;
@@ -94,7 +94,7 @@ extern int adfs_dir_update(struct super_block *sb, struct object_info *obj);
 
 /* file.c */
 extern struct inode_operations adfs_file_inode_operations;
-extern struct file_operations adfs_file_operations;
+extern const struct file_operations adfs_file_operations;
 
 static inline __u32 signed_asl(__u32 val, signed int shift)
 {
diff --git a/fs/adfs/dir.c b/fs/adfs/dir.c
index 0b4c3a028076..7b075fc397da 100644
--- a/fs/adfs/dir.c
+++ b/fs/adfs/dir.c
@@ -196,7 +196,7 @@ out:
         return ret;
 }
 
-struct file_operations adfs_dir_operations = {
+const struct file_operations adfs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = adfs_readdir,
         .fsync          = file_fsync,
diff --git a/fs/adfs/file.c b/fs/adfs/file.c
index 6af10885f9d6..1014b9f2117b 100644
--- a/fs/adfs/file.c
+++ b/fs/adfs/file.c
@@ -25,7 +25,7 @@
 
 #include "adfs.h"
 
-struct file_operations adfs_file_operations = {
+const struct file_operations adfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .mmap           = generic_file_mmap,
diff --git a/fs/affs/affs.h b/fs/affs/affs.h
index 0c6799f2137a..a43a876742b8 100644
--- a/fs/affs/affs.h
+++ b/fs/affs/affs.h
@@ -192,9 +192,9 @@ extern void   affs_dir_truncate(struct inode *);
 extern struct inode_operations   affs_file_inode_operations;
 extern struct inode_operations   affs_dir_inode_operations;
 extern struct inode_operations   affs_symlink_inode_operations;
-extern struct file_operations    affs_file_operations;
-extern struct file_operations    affs_file_operations_ofs;
-extern struct file_operations    affs_dir_operations;
+extern const struct file_operations      affs_file_operations;
+extern const struct file_operations      affs_file_operations_ofs;
+extern const struct file_operations      affs_dir_operations;
 extern struct address_space_operations   affs_symlink_aops;
 extern struct address_space_operations   affs_aops;
 extern struct address_space_operations   affs_aops_ofs;
diff --git a/fs/affs/dir.c b/fs/affs/dir.c
index 548efd0ee98c..5d9649fa1814 100644
--- a/fs/affs/dir.c
+++ b/fs/affs/dir.c
@@ -17,7 +17,7 @@
 
 static int affs_readdir(struct file *, void *, filldir_t);
 
-struct file_operations affs_dir_operations = {
+const struct file_operations affs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = affs_readdir,
         .fsync          = file_fsync,
diff --git a/fs/affs/file.c b/fs/affs/file.c
index f72fb776ecdf..7076262af39b 100644
--- a/fs/affs/file.c
+++ b/fs/affs/file.c
@@ -25,7 +25,7 @@ static struct buffer_head *affs_get_extblock_slow(struct inode *inode, u32 ext);
 static int affs_file_open(struct inode *inode, struct file *filp);
 static int affs_file_release(struct inode *inode, struct file *filp);
 
-struct file_operations affs_file_operations = {
+const struct file_operations affs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 5c61c24dab2a..a6dff6a4f204 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -32,7 +32,7 @@ static int afs_d_delete(struct dentry *dentry);
 static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
                                   loff_t fpos, ino_t ino, unsigned dtype);
 
-struct file_operations afs_dir_file_operations = {
+const struct file_operations afs_dir_file_operations = {
         .open           = afs_dir_open,
         .readdir        = afs_dir_readdir,
 };
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index ab8f87c66319..72febdf9a35a 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -64,7 +64,7 @@ extern struct cachefs_index_def afs_cache_cell_index_def;
  * dir.c
  */
 extern struct inode_operations afs_dir_inode_operations;
-extern struct file_operations afs_dir_file_operations;
+extern const struct file_operations afs_dir_file_operations;
 
 /*
  * file.c
@@ -105,7 +105,7 @@ extern struct cachefs_netfs afs_cache_netfs;
  * mntpt.c
  */
 extern struct inode_operations afs_mntpt_inode_operations;
-extern struct file_operations afs_mntpt_file_operations;
+extern const struct file_operations afs_mntpt_file_operations;
 extern struct afs_timer afs_mntpt_expiry_timer;
 extern struct afs_timer_ops afs_mntpt_expiry_timer_ops;
 extern unsigned long afs_mntpt_expiry_timeout;
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 31ee06590de5..4e6eeb59b83c 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -32,7 +32,7 @@ static struct dentry *afs_mntpt_lookup(struct inode *dir,
 static int afs_mntpt_open(struct inode *inode, struct file *file);
 static void *afs_mntpt_follow_link(struct dentry *dentry, struct nameidata *nd);
 
-struct file_operations afs_mntpt_file_operations = {
+const struct file_operations afs_mntpt_file_operations = {
         .open           = afs_mntpt_open,
 };
 
diff --git a/fs/afs/proc.c b/fs/afs/proc.c
index 9c81b8f7eef0..101d21b6c037 100644
--- a/fs/afs/proc.c
+++ b/fs/afs/proc.c
@@ -37,7 +37,7 @@ static struct seq_operations afs_proc_cells_ops = {
         .show   = afs_proc_cells_show,
 };
 
-static struct file_operations afs_proc_cells_fops = {
+static const struct file_operations afs_proc_cells_fops = {
         .open           = afs_proc_cells_open,
         .read           = seq_read,
         .write          = afs_proc_cells_write,
@@ -53,7 +53,7 @@ static ssize_t afs_proc_rootcell_write(struct file *file,
                                        const char __user *buf,
                                        size_t size, loff_t *_pos);
 
-static struct file_operations afs_proc_rootcell_fops = {
+static const struct file_operations afs_proc_rootcell_fops = {
         .open           = afs_proc_rootcell_open,
         .read           = afs_proc_rootcell_read,
         .write          = afs_proc_rootcell_write,
@@ -77,7 +77,7 @@ static struct seq_operations afs_proc_cell_volumes_ops = {
         .show   = afs_proc_cell_volumes_show,
 };
 
-static struct file_operations afs_proc_cell_volumes_fops = {
+static const struct file_operations afs_proc_cell_volumes_fops = {
         .open           = afs_proc_cell_volumes_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
@@ -101,7 +101,7 @@ static struct seq_operations afs_proc_cell_vlservers_ops = {
         .show   = afs_proc_cell_vlservers_show,
 };
 
-static struct file_operations afs_proc_cell_vlservers_fops = {
+static const struct file_operations afs_proc_cell_vlservers_fops = {
         .open           = afs_proc_cell_vlservers_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
@@ -124,7 +124,7 @@ static struct seq_operations afs_proc_cell_servers_ops = {
         .show   = afs_proc_cell_servers_show,
 };
 
-static struct file_operations afs_proc_cell_servers_fops = {
+static const struct file_operations afs_proc_cell_servers_fops = {
         .open           = afs_proc_cell_servers_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
diff --git a/fs/autofs/autofs_i.h b/fs/autofs/autofs_i.h
index 990c28da5aec..a62327f1bdff 100644
--- a/fs/autofs/autofs_i.h
+++ b/fs/autofs/autofs_i.h
@@ -146,7 +146,7 @@ struct autofs_dir_ent *autofs_expire(struct super_block *,struct autofs_sb_info
 
 extern struct inode_operations autofs_root_inode_operations;
 extern struct inode_operations autofs_symlink_inode_operations;
-extern struct file_operations autofs_root_operations;
+extern const struct file_operations autofs_root_operations;
 
 /* Initializing function */
 
diff --git a/fs/autofs/dirhash.c b/fs/autofs/dirhash.c
index 5ccfcf26310d..3fded389d06b 100644
--- a/fs/autofs/dirhash.c
+++ b/fs/autofs/dirhash.c
@@ -92,7 +92,7 @@ struct autofs_dir_ent *autofs_expire(struct super_block *sb,
                         ;
                 dput(dentry);
 
-                if ( may_umount(mnt) == 0 ) {
+                if ( may_umount(mnt) ) {
                         mntput(mnt);
                         DPRINTK(("autofs: signaling expire on %s\n", ent->name));
                         return ent; /* Expirable! */
diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 870e2cf33016..9cac08d6a873 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -26,7 +26,7 @@ static int autofs_root_rmdir(struct inode *,struct dentry *);
 static int autofs_root_mkdir(struct inode *,struct dentry *,int);
 static int autofs_root_ioctl(struct inode *, struct file *,unsigned int,unsigned long);
 
-struct file_operations autofs_root_operations = {
+const struct file_operations autofs_root_operations = {
         .read           = generic_read_dir,
         .readdir        = autofs_root_readdir,
         .ioctl          = autofs_root_ioctl,
diff --git a/fs/autofs4/autofs_i.h b/fs/autofs4/autofs_i.h
index f54c5b21f876..57c4903614e5 100644
--- a/fs/autofs4/autofs_i.h
+++ b/fs/autofs4/autofs_i.h
@@ -3,6 +3,7 @@
  * linux/fs/autofs/autofs_i.h
  *
  *   Copyright 1997-1998 Transmeta Corporation - All Rights Reserved
+ *   Copyright 2005-2006 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -41,14 +42,6 @@
 
 #define AUTOFS_SUPER_MAGIC 0x0187
 
-/*
- * If the daemon returns a negative response (AUTOFS_IOC_FAIL) then the
- * kernel will keep the negative response cached for up to the time given
- * here, although the time can be shorter if the kernel throws the dcache
- * entry away.  This probably should be settable from user space.
- */
-#define AUTOFS_NEGATIVE_TIMEOUT (60*HZ) /* 1 minute */
-
 /* Unified info structure.  This is pointed to by both the dentry and
    inode structures.  Each file in the filesystem has an instance of this
    structure.  It holds a reference to the dentry, so dentries are never
@@ -63,6 +56,7 @@ struct autofs_info {
 
         struct autofs_sb_info *sbi;
         unsigned long last_used;
+        atomic_t count;
 
         mode_t  mode;
         size_t  size;
@@ -83,23 +77,37 @@ struct autofs_wait_queue {
         int hash;
         int len;
         char *name;
+        u32 dev;
+        u64 ino;
+        uid_t uid;
+        gid_t gid;
+        pid_t pid;
+        pid_t tgid;
         /* This is for status reporting upon return */
         int status;
-        atomic_t notified;
+        atomic_t notify;
         atomic_t wait_ctr;
 };
 
 #define AUTOFS_SBI_MAGIC 0x6d4a556d
 
+#define AUTOFS_TYPE_INDIRECT     0x0001
+#define AUTOFS_TYPE_DIRECT       0x0002
+#define AUTOFS_TYPE_OFFSET       0x0004
+
 struct autofs_sb_info {
         u32 magic;
         struct dentry *root;
+        int pipefd;
         struct file *pipe;
         pid_t oz_pgrp;
         int catatonic;
         int version;
         int sub_version;
+        int min_proto;
+        int max_proto;
         unsigned long exp_timeout;
+        unsigned int type;
         int reghost_enabled;
         int needs_reghost;
         struct super_block *sb;
@@ -166,8 +174,10 @@ int autofs4_expire_multi(struct super_block *, struct vfsmount *,
 extern struct inode_operations autofs4_symlink_inode_operations;
 extern struct inode_operations autofs4_dir_inode_operations;
 extern struct inode_operations autofs4_root_inode_operations;
-extern struct file_operations autofs4_dir_operations;
-extern struct file_operations autofs4_root_operations;
+extern struct inode_operations autofs4_indirect_root_inode_operations;
+extern struct inode_operations autofs4_direct_root_inode_operations;
+extern const struct file_operations autofs4_dir_operations;
+extern const struct file_operations autofs4_root_operations;
 
 /* Initializing function */
 
@@ -176,13 +186,6 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *, struct autofs_sb_info
 
 /* Queue management functions */
 
-enum autofs_notify
-{
-        NFY_NONE,
-        NFY_MOUNT,
-        NFY_EXPIRE
-};
-
 int autofs4_wait(struct autofs_sb_info *,struct dentry *, enum autofs_notify);
 int autofs4_wait_release(struct autofs_sb_info *,autofs_wqt_t,int);
 void autofs4_catatonic_mode(struct autofs_sb_info *);
@@ -200,12 +203,22 @@ static inline int autofs4_follow_mount(struct vfsmount **mnt, struct dentry **de
         return res;
 }
 
+static inline u32 autofs4_get_dev(struct autofs_sb_info *sbi)
+{
+        return new_encode_dev(sbi->sb->s_dev);
+}
+
+static inline u64 autofs4_get_ino(struct autofs_sb_info *sbi)
+{
+        return sbi->sb->s_root->d_inode->i_ino;
+}
+
 static inline int simple_positive(struct dentry *dentry)
 {
         return dentry->d_inode && !d_unhashed(dentry);
 }
 
-static inline int simple_empty_nolock(struct dentry *dentry)
+static inline int __simple_empty(struct dentry *dentry)
 {
         struct dentry *child;
         int ret = 0;
@@ -217,3 +230,6 @@ static inline int simple_empty_nolock(struct dentry *dentry)
 out:
         return ret;
 }
+
+void autofs4_dentry_release(struct dentry *);
+
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index dc39589df165..b8ce02607d66 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -4,7 +4,7 @@
  *
  *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
  *  Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
- *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *  Copyright 2001-2006 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -16,7 +16,7 @@
 
 static unsigned long now;
 
-/* Check if a dentry can be expired return 1 if it can else return 0 */
+/* Check if a dentry can be expired */
 static inline int autofs4_can_expire(struct dentry *dentry,
                                         unsigned long timeout, int do_now)
 {
@@ -41,14 +41,14 @@ static inline int autofs4_can_expire(struct dentry *dentry,
                      attempts if expire fails the first time */
                 ino->last_used = now;
         }
-
         return 1;
 }
 
-/* Check a mount point for busyness return 1 if not busy, otherwise */
-static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry)
+/* Check a mount point for busyness */
+static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
 {
-        int status = 0;
+        struct dentry *top = dentry;
+        int status = 1;
 
         DPRINTK("dentry %p %.*s",
                 dentry, (int)dentry->d_name.len, dentry->d_name.name);
@@ -63,9 +63,14 @@ static int autofs4_check_mount(struct vfsmount *mnt, struct dentry *dentry)
         if (is_autofs4_dentry(dentry))
                 goto done;
 
-        /* The big question */
-        if (may_umount_tree(mnt) == 0)
-                status = 1;
+        /* Update the expiry counter if fs is busy */
+        if (!may_umount_tree(mnt)) {
+                struct autofs_info *ino = autofs4_dentry_ino(top);
+                ino->last_used = jiffies;
+                goto done;
+        }
+
+        status = 0;
 done:
         DPRINTK("returning = %d", status);
         mntput(mnt);
@@ -73,78 +78,124 @@ done:
         return status;
 }
 
+/*
+ * Calculate next entry in top down tree traversal.
+ * From next_mnt in namespace.c - elegant.
+ */
+static struct dentry *next_dentry(struct dentry *p, struct dentry *root)
+{
+        struct list_head *next = p->d_subdirs.next;
+
+        if (next == &p->d_subdirs) {
+                while (1) {
+                        if (p == root)
+                                return NULL;
+                        next = p->d_u.d_child.next;
+                        if (next != &p->d_parent->d_subdirs)
+                                break;
+                        p = p->d_parent;
+                }
+        }
+        return list_entry(next, struct dentry, d_u.d_child);
+}
+
+/*
+ * Check a direct mount point for busyness.
+ * Direct mounts have similar expiry semantics to tree mounts.
+ * The tree is not busy iff no mountpoints are busy and there are no
+ * autofs submounts.
+ */
+static int autofs4_direct_busy(struct vfsmount *mnt,
+                                struct dentry *top,
+                                unsigned long timeout,
+                                int do_now)
+{
+        DPRINTK("top %p %.*s",
+                top, (int) top->d_name.len, top->d_name.name);
+
+        /* If it's busy update the expiry counters */
+        if (!may_umount_tree(mnt)) {
+                struct autofs_info *ino = autofs4_dentry_ino(top);
+                if (ino)
+                        ino->last_used = jiffies;
+                return 1;
+        }
+
+        /* Timeout of a direct mount is determined by its top dentry */
+        if (!autofs4_can_expire(top, timeout, do_now))
+                return 1;
+
+        return 0;
+}
+
 /* Check a directory tree of mount points for busyness
  * The tree is not busy iff no mountpoints are busy
- * Return 1 if the tree is busy or 0 otherwise
  */
-static int autofs4_check_tree(struct vfsmount *mnt,
-                              struct dentry *top,
-                              unsigned long timeout,
-                              int do_now)
+static int autofs4_tree_busy(struct vfsmount *mnt,
+                             struct dentry *top,
+                             unsigned long timeout,
+                             int do_now)
 {
-        struct dentry *this_parent = top;
-        struct list_head *next;
+        struct autofs_info *top_ino = autofs4_dentry_ino(top);
+        struct dentry *p;
 
-        DPRINTK("parent %p %.*s",
+        DPRINTK("top %p %.*s",
                 top, (int)top->d_name.len, top->d_name.name);
 
         /* Negative dentry - give up */
         if (!simple_positive(top))
-                return 0;
-
-        /* Timeout of a tree mount is determined by its top dentry */
-        if (!autofs4_can_expire(top, timeout, do_now))
-                return 0;
-
-        /* Is someone visiting anywhere in the tree ? */
-        if (may_umount_tree(mnt))
-                return 0;
+                return 1;
 
         spin_lock(&dcache_lock);
-repeat:
-        next = this_parent->d_subdirs.next;
-resume:
-        while (next != &this_parent->d_subdirs) {
-                struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
-
+        for (p = top; p; p = next_dentry(p, top)) {
                 /* Negative dentry - give up */
-                if (!simple_positive(dentry)) {
-                        next = next->next;
+                if (!simple_positive(p))
                         continue;
-                }
 
                 DPRINTK("dentry %p %.*s",
-                        dentry, (int)dentry->d_name.len, dentry->d_name.name);
-
-                if (!simple_empty_nolock(dentry)) {
-                        this_parent = dentry;
-                        goto repeat;
-                }
+                        p, (int) p->d_name.len, p->d_name.name);
 
-                dentry = dget(dentry);
+                p = dget(p);
                 spin_unlock(&dcache_lock);
 
-                if (d_mountpoint(dentry)) {
-                        /* First busy => tree busy */
-                        if (!autofs4_check_mount(mnt, dentry)) {
-                                dput(dentry);
-                                return 0;
+                /*
+                 * Is someone visiting anywhere in the subtree ?
+                 * If there's no mount we need to check the usage
+                 * count for the autofs dentry.
+                 * If the fs is busy update the expiry counter.
+                 */
+                if (d_mountpoint(p)) {
+                        if (autofs4_mount_busy(mnt, p)) {
+                                top_ino->last_used = jiffies;
+                                dput(p);
+                                return 1;
+                        }
+                } else {
+                        struct autofs_info *ino = autofs4_dentry_ino(p);
+                        unsigned int ino_count = atomic_read(&ino->count);
+
+                        /* allow for dget above and top is already dgot */
+                        if (p == top)
+                                ino_count += 2;
+                        else
+                                ino_count++;
+
+                        if (atomic_read(&p->d_count) > ino_count) {
+                                top_ino->last_used = jiffies;
+                                dput(p);
+                                return 1;
                         }
                 }
-
-                dput(dentry);
+                dput(p);
                 spin_lock(&dcache_lock);
-                next = next->next;
-        }
-
-        if (this_parent != top) {
-                next = this_parent->d_u.d_child.next;
-                this_parent = this_parent->d_parent;
-                goto resume;
         }
         spin_unlock(&dcache_lock);
 
-        return 1;
+        /* Timeout of a tree mount is ultimately determined by its top dentry */
+        if (!autofs4_can_expire(top, timeout, do_now))
+                return 1;
+
+        return 0;
 }
 
 static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
@@ -152,58 +203,68 @@ static struct dentry *autofs4_check_leaves(struct vfsmount *mnt,
                                            unsigned long timeout,
                                            int do_now)
 {
-        struct dentry *this_parent = parent;
-        struct list_head *next;
+        struct dentry *p;
 
         DPRINTK("parent %p %.*s",
                 parent, (int)parent->d_name.len, parent->d_name.name);
 
         spin_lock(&dcache_lock);
-repeat:
-        next = this_parent->d_subdirs.next;
-resume:
-        while (next != &this_parent->d_subdirs) {
-                struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
-
+        for (p = parent; p; p = next_dentry(p, parent)) {
                 /* Negative dentry - give up */
-                if (!simple_positive(dentry)) {
-                        next = next->next;
+                if (!simple_positive(p))
                         continue;
-                }
 
                 DPRINTK("dentry %p %.*s",
-                        dentry, (int)dentry->d_name.len, dentry->d_name.name);
-
-                if (!list_empty(&dentry->d_subdirs)) {
-                        this_parent = dentry;
-                        goto repeat;
-                }
+                        p, (int) p->d_name.len, p->d_name.name);
 
-                dentry = dget(dentry);
+                p = dget(p);
                 spin_unlock(&dcache_lock);
 
-                if (d_mountpoint(dentry)) {
-                        /* Can we expire this guy */
-                        if (!autofs4_can_expire(dentry, timeout, do_now))
-                                goto cont;
-
+                if (d_mountpoint(p)) {
                         /* Can we umount this guy */
-                        if (autofs4_check_mount(mnt, dentry))
-                                return dentry;
+                        if (autofs4_mount_busy(mnt, p))
+                                goto cont;
 
+                        /* Can we expire this guy */
+                        if (autofs4_can_expire(p, timeout, do_now))
+                                return p;
                 }
 cont:
-                dput(dentry);
+                dput(p);
                 spin_lock(&dcache_lock);
-                next = next->next;
         }
+        spin_unlock(&dcache_lock);
+        return NULL;
+}
+
+/* Check if we can expire a direct mount (possibly a tree) */
+static struct dentry *autofs4_expire_direct(struct super_block *sb,
+                                            struct vfsmount *mnt,
+                                            struct autofs_sb_info *sbi,
+                                            int how)
+{
+        unsigned long timeout;
+        struct dentry *root = dget(sb->s_root);
+        int do_now = how & AUTOFS_EXP_IMMEDIATE;
+
+        if (!sbi->exp_timeout || !root)
+                return NULL;
+
+        now = jiffies;
+        timeout = sbi->exp_timeout;
+
+        /* Lock the tree as we must expire as a whole */
+        spin_lock(&sbi->fs_lock);
+        if (!autofs4_direct_busy(mnt, root, timeout, do_now)) {
+                struct autofs_info *ino = autofs4_dentry_ino(root);
 
-        if (this_parent != parent) {
-                next = this_parent->d_u.d_child.next;
-                this_parent = this_parent->d_parent;
-                goto resume;
+                /* Set this flag early to catch sys_chdir and the like */
+                ino->flags |= AUTOFS_INF_EXPIRING;
+                spin_unlock(&sbi->fs_lock);
+                return root;
         }
-        spin_unlock(&dcache_lock);
+        spin_unlock(&sbi->fs_lock);
+        dput(root);
 
         return NULL;
 }
@@ -214,10 +275,10 @@ cont:
  *  - it is unused by any user process
  *  - it has been unused for exp_timeout time
  */
-static struct dentry *autofs4_expire(struct super_block *sb,
-                                     struct vfsmount *mnt,
-                                     struct autofs_sb_info *sbi,
-                                     int how)
+static struct dentry *autofs4_expire_indirect(struct super_block *sb,
+                                              struct vfsmount *mnt,
+                                              struct autofs_sb_info *sbi,
+                                              int how)
 {
         unsigned long timeout;
         struct dentry *root = sb->s_root;
@@ -241,7 +302,7 @@ static struct dentry *autofs4_expire(struct super_block *sb,
                 struct dentry *dentry = list_entry(next, struct dentry, d_u.d_child);
 
                 /* Negative dentry - give up */
-                if ( !simple_positive(dentry) ) {
+                if (!simple_positive(dentry)) {
                         next = next->next;
                         continue;
                 }
@@ -249,31 +310,36 @@ static struct dentry *autofs4_expire(struct super_block *sb,
                 dentry = dget(dentry);
                 spin_unlock(&dcache_lock);
 
-                /* Case 1: indirect mount or top level direct mount */
+                /*
+                 * Case 1: (i) indirect mount or top level pseudo direct mount
+                 *         (autofs-4.1).
+                 *         (ii) indirect mount with offset mount, check the "/"
+                 *         offset (autofs-5.0+).
+                 */
                 if (d_mountpoint(dentry)) {
                         DPRINTK("checking mountpoint %p %.*s",
                                 dentry, (int)dentry->d_name.len, dentry->d_name.name);
 
-                        /* Can we expire this guy */
-                        if (!autofs4_can_expire(dentry, timeout, do_now))
+                        /* Can we umount this guy */
+                        if (autofs4_mount_busy(mnt, dentry))
                                 goto next;
 
-                        /* Can we umount this guy */
-                        if (autofs4_check_mount(mnt, dentry)) {
+                        /* Can we expire this guy */
+                        if (autofs4_can_expire(dentry, timeout, do_now)) {
                                 expired = dentry;
                                 break;
                         }
                         goto next;
                 }
 
-                if ( simple_empty(dentry) )
+                if (simple_empty(dentry))
                         goto next;
 
                 /* Case 2: tree mount, expire iff entire tree is not busy */
                 if (!exp_leaves) {
                         /* Lock the tree as we must expire as a whole */
                         spin_lock(&sbi->fs_lock);
-                        if (autofs4_check_tree(mnt, dentry, timeout, do_now)) {
+                        if (!autofs4_tree_busy(mnt, dentry, timeout, do_now)) {
                                 struct autofs_info *inf = autofs4_dentry_ino(dentry);
 
                                 /* Set this flag early to catch sys_chdir and the like */
@@ -283,7 +349,10 @@ static struct dentry *autofs4_expire(struct super_block *sb,
                                 break;
                         }
                         spin_unlock(&sbi->fs_lock);
-                /* Case 3: direct mount, expire individual leaves */
+                /*
+                 * Case 3: pseudo direct mount, expire individual leaves
+                 *         (autofs-4.1).
+                 */
                 } else {
                         expired = autofs4_check_leaves(mnt, dentry, timeout, do_now);
                         if (expired) {
@@ -297,7 +366,7 @@ next:
                 next = next->next;
         }
 
-        if ( expired ) {
+        if (expired) {
                 DPRINTK("returning %p %.*s",
                         expired, (int)expired->d_name.len, expired->d_name.name);
                 spin_lock(&dcache_lock);
@@ -325,7 +394,7 @@ int autofs4_expire_run(struct super_block *sb,
         pkt.hdr.proto_version = sbi->version;
         pkt.hdr.type = autofs_ptype_expire;
 
-        if ((dentry = autofs4_expire(sb, mnt, sbi, 0)) == NULL)
+        if ((dentry = autofs4_expire_indirect(sb, mnt, sbi, 0)) == NULL)
                 return -EAGAIN;
 
         pkt.len = dentry->d_name.len;
@@ -351,17 +420,22 @@ int autofs4_expire_multi(struct super_block *sb, struct vfsmount *mnt,
         if (arg && get_user(do_now, arg))
                 return -EFAULT;
 
-        if ((dentry = autofs4_expire(sb, mnt, sbi, do_now)) != NULL) {
-                struct autofs_info *de_info = autofs4_dentry_ino(dentry);
+        if (sbi->type & AUTOFS_TYPE_DIRECT)
+                dentry = autofs4_expire_direct(sb, mnt, sbi, do_now);
+        else
+                dentry = autofs4_expire_indirect(sb, mnt, sbi, do_now);
+
+        if (dentry) {
+                struct autofs_info *ino = autofs4_dentry_ino(dentry);
 
                 /* This is synchronous because it makes the daemon a
                    little easier */
-                de_info->flags |= AUTOFS_INF_EXPIRING;
+                ino->flags |= AUTOFS_INF_EXPIRING;
                 ret = autofs4_wait(sbi, dentry, NFY_EXPIRE);
-                de_info->flags &= ~AUTOFS_INF_EXPIRING;
+                ino->flags &= ~AUTOFS_INF_EXPIRING;
                 dput(dentry);
         }
-                
+
         return ret;
 }
 
diff --git a/fs/autofs4/inode.c b/fs/autofs4/inode.c
index 1ad98d48e550..fde78b110ddd 100644
--- a/fs/autofs4/inode.c
+++ b/fs/autofs4/inode.c
@@ -3,6 +3,7 @@
  * linux/fs/autofs/inode.c
  *
  *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
+ *  Copyright 2005-2006 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -13,6 +14,7 @@
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/file.h>
+#include <linux/seq_file.h>
 #include <linux/pagemap.h>
 #include <linux/parser.h>
 #include <linux/bitops.h>
@@ -46,6 +48,7 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
         ino->size = 0;
 
         ino->last_used = jiffies;
+        atomic_set(&ino->count, 0);
 
         ino->sbi = sbi;
 
@@ -64,10 +67,19 @@ struct autofs_info *autofs4_init_ino(struct autofs_info *ino,
 
 void autofs4_free_ino(struct autofs_info *ino)
 {
+        struct autofs_info *p_ino;
+
         if (ino->dentry) {
                 ino->dentry->d_fsdata = NULL;
-                if (ino->dentry->d_inode)
+                if (ino->dentry->d_inode) {
+                        struct dentry *parent = ino->dentry->d_parent;
+                        if (atomic_dec_and_test(&ino->count)) {
+                                p_ino = autofs4_dentry_ino(parent);
+                                if (p_ino && parent != ino->dentry)
+                                        atomic_dec(&p_ino->count);
+                        }
                         dput(ino->dentry);
+                }
                 ino->dentry = NULL;
         }
         if (ino->free)
@@ -145,20 +157,44 @@ static void autofs4_put_super(struct super_block *sb)
                 autofs4_catatonic_mode(sbi); /* Free wait queues, close pipe */
 
         /* Clean up and release dangling references */
-        if (sbi)
-                autofs4_force_release(sbi);
+        autofs4_force_release(sbi);
 
         kfree(sbi);
 
         DPRINTK("shutting down");
 }
 
+static int autofs4_show_options(struct seq_file *m, struct vfsmount *mnt)
+{
+        struct autofs_sb_info *sbi = autofs4_sbi(mnt->mnt_sb);
+
+        if (!sbi)
+                return 0;
+
+        seq_printf(m, ",fd=%d", sbi->pipefd);
+        seq_printf(m, ",pgrp=%d", sbi->oz_pgrp);
+        seq_printf(m, ",timeout=%lu", sbi->exp_timeout/HZ);
+        seq_printf(m, ",minproto=%d", sbi->min_proto);
+        seq_printf(m, ",maxproto=%d", sbi->max_proto);
+
+        if (sbi->type & AUTOFS_TYPE_OFFSET)
+                seq_printf(m, ",offset");
+        else if (sbi->type & AUTOFS_TYPE_DIRECT)
+                seq_printf(m, ",direct");
+        else
+                seq_printf(m, ",indirect");
+
+        return 0;
+}
+
 static struct super_operations autofs4_sops = {
         .put_super      = autofs4_put_super,
         .statfs         = simple_statfs,
+        .show_options   = autofs4_show_options,
 };
 
-enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto};
+enum {Opt_err, Opt_fd, Opt_uid, Opt_gid, Opt_pgrp, Opt_minproto, Opt_maxproto,
+        Opt_indirect, Opt_direct, Opt_offset};
 
 static match_table_t tokens = {
         {Opt_fd, "fd=%u"},
@@ -167,11 +203,15 @@ static match_table_t tokens = {
         {Opt_pgrp, "pgrp=%u"},
         {Opt_minproto, "minproto=%u"},
         {Opt_maxproto, "maxproto=%u"},
+        {Opt_indirect, "indirect"},
+        {Opt_direct, "direct"},
+        {Opt_offset, "offset"},
         {Opt_err, NULL}
 };
 
 static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
-                         pid_t *pgrp, int *minproto, int *maxproto)
+                         pid_t *pgrp, unsigned int *type,
+                         int *minproto, int *maxproto)
 {
         char *p;
         substring_t args[MAX_OPT_ARGS];
@@ -225,6 +265,15 @@ static int parse_options(char *options, int *pipefd, uid_t *uid, gid_t *gid,
                                 return 1;
                         *maxproto = option;
                         break;
+                case Opt_indirect:
+                        *type = AUTOFS_TYPE_INDIRECT;
+                        break;
+                case Opt_direct:
+                        *type = AUTOFS_TYPE_DIRECT;
+                        break;
+                case Opt_offset:
+                        *type = AUTOFS_TYPE_DIRECT | AUTOFS_TYPE_OFFSET;
+                        break;
                 default:
                         return 1;
                 }
@@ -243,6 +292,10 @@ static struct autofs_info *autofs4_mkroot(struct autofs_sb_info *sbi)
         return ino;
 }
 
+static struct dentry_operations autofs4_sb_dentry_operations = {
+        .d_release      = autofs4_dentry_release,
+};
+
 int autofs4_fill_super(struct super_block *s, void *data, int silent)
 {
         struct inode * root_inode;
@@ -251,7 +304,6 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         int pipefd;
         struct autofs_sb_info *sbi;
         struct autofs_info *ino;
-        int minproto, maxproto;
 
         sbi = (struct autofs_sb_info *) kmalloc(sizeof(*sbi), GFP_KERNEL);
         if ( !sbi )
@@ -263,12 +315,16 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         s->s_fs_info = sbi;
         sbi->magic = AUTOFS_SBI_MAGIC;
         sbi->root = NULL;
+        sbi->pipefd = -1;
         sbi->catatonic = 0;
         sbi->exp_timeout = 0;
         sbi->oz_pgrp = process_group(current);
         sbi->sb = s;
         sbi->version = 0;
         sbi->sub_version = 0;
+        sbi->type = 0;
+        sbi->min_proto = 0;
+        sbi->max_proto = 0;
         mutex_init(&sbi->wq_mutex);
         spin_lock_init(&sbi->fs_lock);
         sbi->queues = NULL;
@@ -285,38 +341,46 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         if (!ino)
                 goto fail_free;
         root_inode = autofs4_get_inode(s, ino);
-        kfree(ino);
         if (!root_inode)
-                goto fail_free;
+                goto fail_ino;
 
-        root_inode->i_op = &autofs4_root_inode_operations;
-        root_inode->i_fop = &autofs4_root_operations;
         root = d_alloc_root(root_inode);
-        pipe = NULL;
-
         if (!root)
                 goto fail_iput;
+        pipe = NULL;
+
+        root->d_op = &autofs4_sb_dentry_operations;
+        root->d_fsdata = ino;
 
         /* Can this call block? */
         if (parse_options(data, &pipefd,
                           &root_inode->i_uid, &root_inode->i_gid,
-                          &sbi->oz_pgrp,
-                          &minproto, &maxproto)) {
+                          &sbi->oz_pgrp, &sbi->type,
+                          &sbi->min_proto, &sbi->max_proto)) {
                 printk("autofs: called with bogus options\n");
                 goto fail_dput;
         }
 
+        root_inode->i_fop = &autofs4_root_operations;
+        root_inode->i_op = sbi->type & AUTOFS_TYPE_DIRECT ?
+                        &autofs4_direct_root_inode_operations :
+                        &autofs4_indirect_root_inode_operations;
+
         /* Couldn't this be tested earlier? */
-        if (maxproto < AUTOFS_MIN_PROTO_VERSION ||
-            minproto > AUTOFS_MAX_PROTO_VERSION) {
+        if (sbi->max_proto < AUTOFS_MIN_PROTO_VERSION ||
+            sbi->min_proto > AUTOFS_MAX_PROTO_VERSION) {
                 printk("autofs: kernel does not match daemon version "
                        "daemon (%d, %d) kernel (%d, %d)\n",
-                        minproto, maxproto,
+                        sbi->min_proto, sbi->max_proto,
                         AUTOFS_MIN_PROTO_VERSION, AUTOFS_MAX_PROTO_VERSION);
                 goto fail_dput;
         }
 
-        sbi->version = maxproto > AUTOFS_MAX_PROTO_VERSION ? AUTOFS_MAX_PROTO_VERSION : maxproto;
+        /* Establish highest kernel protocol version */
+        if (sbi->max_proto > AUTOFS_MAX_PROTO_VERSION)
+                sbi->version = AUTOFS_MAX_PROTO_VERSION;
+        else
+                sbi->version = sbi->max_proto;
         sbi->sub_version = AUTOFS_PROTO_SUBVERSION;
 
         DPRINTK("pipe fd = %d, pgrp = %u", pipefd, sbi->oz_pgrp);
@@ -329,6 +393,7 @@ int autofs4_fill_super(struct super_block *s, void *data, int silent)
         if ( !pipe->f_op || !pipe->f_op->write )
                 goto fail_fput;
         sbi->pipe = pipe;
+        sbi->pipefd = pipefd;
 
         /*
          * Take a reference to the root dentry so we get a chance to
@@ -356,6 +421,8 @@ fail_dput:
 fail_iput:
         printk("autofs: get root dentry failed\n");
         iput(root_inode);
+fail_ino:
+        kfree(ino);
 fail_free:
         kfree(sbi);
 fail_unlock:
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 62d8d4acb8bb..84e030c8ddd0 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -4,7 +4,7 @@
  *
  *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
  *  Copyright 1999-2000 Jeremy Fitzhardinge <jeremy@goop.org>
- *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *  Copyright 2001-2006 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -30,9 +30,9 @@ static int autofs4_dir_close(struct inode *inode, struct file *file);
 static int autofs4_dir_readdir(struct file * filp, void * dirent, filldir_t filldir);
 static int autofs4_root_readdir(struct file * filp, void * dirent, filldir_t filldir);
 static struct dentry *autofs4_lookup(struct inode *,struct dentry *, struct nameidata *);
-static int autofs4_dcache_readdir(struct file *, void *, filldir_t);
+static void *autofs4_follow_link(struct dentry *, struct nameidata *);
 
-struct file_operations autofs4_root_operations = {
+const struct file_operations autofs4_root_operations = {
         .open           = dcache_dir_open,
         .release        = dcache_dir_close,
         .read           = generic_read_dir,
@@ -40,14 +40,14 @@ struct file_operations autofs4_root_operations = {
         .ioctl          = autofs4_root_ioctl,
 };
 
-struct file_operations autofs4_dir_operations = {
+const struct file_operations autofs4_dir_operations = {
         .open           = autofs4_dir_open,
         .release        = autofs4_dir_close,
         .read           = generic_read_dir,
         .readdir        = autofs4_dir_readdir,
 };
 
-struct inode_operations autofs4_root_inode_operations = {
+struct inode_operations autofs4_indirect_root_inode_operations = {
         .lookup         = autofs4_lookup,
         .unlink         = autofs4_dir_unlink,
         .symlink        = autofs4_dir_symlink,
@@ -55,6 +55,14 @@ struct inode_operations autofs4_root_inode_operations = {
         .rmdir          = autofs4_dir_rmdir,
 };
 
+struct inode_operations autofs4_direct_root_inode_operations = {
+        .lookup         = autofs4_lookup,
+        .unlink         = autofs4_dir_unlink,
+        .mkdir          = autofs4_dir_mkdir,
+        .rmdir          = autofs4_dir_rmdir,
+        .follow_link    = autofs4_follow_link,
+};
+
 struct inode_operations autofs4_dir_inode_operations = {
         .lookup         = autofs4_lookup,
         .unlink         = autofs4_dir_unlink,
@@ -82,87 +90,7 @@ static int autofs4_root_readdir(struct file *file, void *dirent,
 
         DPRINTK("needs_reghost = %d", sbi->needs_reghost);
 
-        return autofs4_dcache_readdir(file, dirent, filldir);
-}
-
-/* Update usage from here to top of tree, so that scan of
-   top-level directories will give a useful result */
-static void autofs4_update_usage(struct vfsmount *mnt, struct dentry *dentry)
-{
-        struct dentry *top = dentry->d_sb->s_root;
-
-        spin_lock(&dcache_lock);
-        for(; dentry != top; dentry = dentry->d_parent) {
-                struct autofs_info *ino = autofs4_dentry_ino(dentry);
-
-                if (ino) {
-                        touch_atime(mnt, dentry);
-                        ino->last_used = jiffies;
-                }
-        }
-        spin_unlock(&dcache_lock);
-}
-
-/*
- * From 2.4 kernel readdir.c
- */
-static int autofs4_dcache_readdir(struct file * filp, void * dirent, filldir_t filldir)
-{
-        int i;
-        struct dentry *dentry = filp->f_dentry;
-
-        i = filp->f_pos;
-        switch (i) {
-                case 0:
-                        if (filldir(dirent, ".", 1, i, dentry->d_inode->i_ino, DT_DIR) < 0)
-                                break;
-                        i++;
-                        filp->f_pos++;
-                        /* fallthrough */
-                case 1:
-                        if (filldir(dirent, "..", 2, i, dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
-                                break;
-                        i++;
-                        filp->f_pos++;
-                        /* fallthrough */
-                default: {
-                        struct list_head *list;
-                        int j = i-2;
-
-                        spin_lock(&dcache_lock);
-                        list = dentry->d_subdirs.next;
-
-                        for (;;) {
-                                if (list == &dentry->d_subdirs) {
-                                        spin_unlock(&dcache_lock);
-                                        return 0;
-                                }
-                                if (!j)
-                                        break;
-                                j--;
-                                list = list->next;
-                        }
-
-                        while(1) {
-                                struct dentry *de = list_entry(list,
-                                                struct dentry, d_u.d_child);
-
-                                if (!d_unhashed(de) && de->d_inode) {
-                                        spin_unlock(&dcache_lock);
-                                        if (filldir(dirent, de->d_name.name, de->d_name.len, filp->f_pos, de->d_inode->i_ino, DT_UNKNOWN) < 0)
-                                                break;
-                                        spin_lock(&dcache_lock);
-                                }
-                                filp->f_pos++;
-                                list = list->next;
-                                if (list != &dentry->d_subdirs)
-                                        continue;
-                                spin_unlock(&dcache_lock);
-                                break;
-                        }
-                }
-        }
-        return 0;
+        return dcache_readdir(file, dirent, filldir);
 }
 
 static int autofs4_dir_open(struct inode *inode, struct file *file)
@@ -170,8 +98,16 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
         struct dentry *dentry = file->f_dentry;
         struct vfsmount *mnt = file->f_vfsmnt;
         struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        struct dentry *cursor;
         int status;
 
+        status = dcache_dir_open(inode, file);
+        if (status)
+                goto out;
+
+        cursor = file->private_data;
+        cursor->d_fsdata = NULL;
+
         DPRINTK("file=%p dentry=%p %.*s",
                 file, dentry, dentry->d_name.len, dentry->d_name.name);
 
@@ -180,12 +116,15 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
 
         if (autofs4_ispending(dentry)) {
                 DPRINTK("dentry busy");
-                return -EBUSY;
+                dcache_dir_close(inode, file);
+                status = -EBUSY;
+                goto out;
         }
 
+        status = -ENOENT;
         if (!d_mountpoint(dentry) && dentry->d_op && dentry->d_op->d_revalidate) {
                 struct nameidata nd;
-                int empty;
+                int empty, ret;
 
                 /* In case there are stale directory dentrys from a failed mount */
                 spin_lock(&dcache_lock);
@@ -195,13 +134,13 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
                 if (!empty)
                         d_invalidate(dentry);
 
-                nd.dentry = dentry;
-                nd.mnt = mnt;
                 nd.flags = LOOKUP_DIRECTORY;
-                status = (dentry->d_op->d_revalidate)(dentry, &nd);
+                ret = (dentry->d_op->d_revalidate)(dentry, &nd);
 
-                if (!status)
-                        return -ENOENT;
+                if (!ret) {
+                        dcache_dir_close(inode, file);
+                        goto out;
+                }
         }
 
         if (d_mountpoint(dentry)) {
@@ -212,25 +151,29 @@ static int autofs4_dir_open(struct inode *inode, struct file *file)
                 if (!autofs4_follow_mount(&fp_mnt, &fp_dentry)) {
                         dput(fp_dentry);
                         mntput(fp_mnt);
-                        return -ENOENT;
+                        dcache_dir_close(inode, file);
+                        goto out;
                 }
 
                 fp = dentry_open(fp_dentry, fp_mnt, file->f_flags);
                 status = PTR_ERR(fp);
                 if (IS_ERR(fp)) {
-                        file->private_data = NULL;
-                        return status;
+                        dcache_dir_close(inode, file);
+                        goto out;
                 }
-                file->private_data = fp;
+                cursor->d_fsdata = fp;
         }
-out:
         return 0;
+out:
+        return status;
 }
 
 static int autofs4_dir_close(struct inode *inode, struct file *file)
 {
         struct dentry *dentry = file->f_dentry;
         struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        struct dentry *cursor = file->private_data;
+        int status = 0;
 
         DPRINTK("file=%p dentry=%p %.*s",
                 file, dentry, dentry->d_name.len, dentry->d_name.name);
@@ -240,26 +183,28 @@ static int autofs4_dir_close(struct inode *inode, struct file *file)
 
         if (autofs4_ispending(dentry)) {
                 DPRINTK("dentry busy");
-                return -EBUSY;
+                status = -EBUSY;
+                goto out;
         }
 
         if (d_mountpoint(dentry)) {
-                struct file *fp = file->private_data;
-
-                if (!fp)
-                        return -ENOENT;
-
+                struct file *fp = cursor->d_fsdata;
+                if (!fp) {
+                        status = -ENOENT;
+                        goto out;
+                }
                 filp_close(fp, current->files);
-                file->private_data = NULL;
         }
 out:
-        return 0;
+        dcache_dir_close(inode, file);
+        return status;
 }
 
 static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldir)
 {
         struct dentry *dentry = file->f_dentry;
         struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        struct dentry *cursor = file->private_data;
         int status;
 
         DPRINTK("file=%p dentry=%p %.*s",
@@ -274,7 +219,7 @@ static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldi
         }
 
         if (d_mountpoint(dentry)) {
-                struct file *fp = file->private_data;
+                struct file *fp = cursor->d_fsdata;
 
                 if (!fp)
                         return -ENOENT;
@@ -289,27 +234,26 @@ static int autofs4_dir_readdir(struct file *file, void *dirent, filldir_t filldi
                 return status;
         }
 out:
-        return autofs4_dcache_readdir(file, dirent, filldir);
+        return dcache_readdir(file, dirent, filldir);
 }
 
-static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int flags)
+static int try_to_fill_dentry(struct dentry *dentry, int flags)
 {
-        struct super_block *sb = mnt->mnt_sb;
-        struct autofs_sb_info *sbi = autofs4_sbi(sb);
-        struct autofs_info *de_info = autofs4_dentry_ino(dentry);
+        struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        struct autofs_info *ino = autofs4_dentry_ino(dentry);
         int status = 0;
 
         /* Block on any pending expiry here; invalidate the dentry
            when expiration is done to trigger mount request with a new
            dentry */
-        if (de_info && (de_info->flags & AUTOFS_INF_EXPIRING)) {
+        if (ino && (ino->flags & AUTOFS_INF_EXPIRING)) {
                 DPRINTK("waiting for expire %p name=%.*s",
                          dentry, dentry->d_name.len, dentry->d_name.name);
 
                 status = autofs4_wait(sbi, dentry, NFY_NONE);
-                
+
                 DPRINTK("expire done status=%d", status);
-                
+
                 /*
                  * If the directory still exists the mount request must
                  * continue otherwise it can't be followed at the right
@@ -317,34 +261,36 @@ static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int f
                  */
                 status = d_invalidate(dentry);
                 if (status != -EBUSY)
-                        return 0;
+                        return -ENOENT;
         }
 
         DPRINTK("dentry=%p %.*s ino=%p",
                  dentry, dentry->d_name.len, dentry->d_name.name, dentry->d_inode);
 
-        /* Wait for a pending mount, triggering one if there isn't one already */
+        /*
+         * Wait for a pending mount, triggering one if there
+         * isn't one already
+         */
         if (dentry->d_inode == NULL) {
                 DPRINTK("waiting for mount name=%.*s",
                          dentry->d_name.len, dentry->d_name.name);
 
                 status = autofs4_wait(sbi, dentry, NFY_MOUNT);
-                 
+
                 DPRINTK("mount done status=%d", status);
 
                 if (status && dentry->d_inode)
-                        return 0; /* Try to get the kernel to invalidate this dentry */
-                
+                        return status; /* Try to get the kernel to invalidate this dentry */
+
                 /* Turn this into a real negative dentry? */
                 if (status == -ENOENT) {
-                        dentry->d_time = jiffies + AUTOFS_NEGATIVE_TIMEOUT;
                         spin_lock(&dentry->d_lock);
                         dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
                         spin_unlock(&dentry->d_lock);
-                        return 1;
+                        return status;
                 } else if (status) {
                         /* Return a negative dentry, but leave it "pending" */
-                        return 1;
+                        return status;
                 }
         /* Trigger mount for path component or follow link */
         } else if (flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY) ||
@@ -363,19 +309,87 @@ static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int f
                         spin_lock(&dentry->d_lock);
                         dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
                         spin_unlock(&dentry->d_lock);
-                        return 0;
+                        return status;
                 }
         }
 
-        /* We don't update the usages for the autofs daemon itself, this
-           is necessary for recursive autofs mounts */
-        if (!autofs4_oz_mode(sbi))
-                autofs4_update_usage(mnt, dentry);
+        /* Initialize expiry counter after successful mount */
+        if (ino)
+                ino->last_used = jiffies;
 
         spin_lock(&dentry->d_lock);
         dentry->d_flags &= ~DCACHE_AUTOFS_PENDING;
         spin_unlock(&dentry->d_lock);
-        return 1;
+        return status;
+}
+
+/* For autofs direct mounts the follow link triggers the mount */
+static void *autofs4_follow_link(struct dentry *dentry, struct nameidata *nd)
+{
+        struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
+        int oz_mode = autofs4_oz_mode(sbi);
+        unsigned int lookup_type;
+        int status;
+
+        DPRINTK("dentry=%p %.*s oz_mode=%d nd->flags=%d",
+                dentry, dentry->d_name.len, dentry->d_name.name, oz_mode,
+                nd->flags);
+
+        /* If it's our master or we shouldn't trigger a mount we're done */
+        lookup_type = nd->flags & (LOOKUP_CONTINUE | LOOKUP_DIRECTORY);
+        if (oz_mode || !lookup_type)
+                goto done;
+
+        /*
+         * If a request is pending wait for it.
+         * If it's a mount then it won't be expired till at least
+         * a liitle later and if it's an expire then we might need
+         * to mount it again.
+         */
+        if (autofs4_ispending(dentry)) {
+                DPRINTK("waiting for active request %p name=%.*s",
+                        dentry, dentry->d_name.len, dentry->d_name.name);
+
+                status = autofs4_wait(sbi, dentry, NFY_NONE);
+
+                DPRINTK("request done status=%d", status);
+        }
+
+        /*
+         * If the dentry contains directories then it is an
+         * autofs multi-mount with no root mount offset. So
+         * don't try to mount it again.
+         */
+        spin_lock(&dcache_lock);
+        if (!d_mountpoint(dentry) && list_empty(&dentry->d_subdirs)) {
+                spin_unlock(&dcache_lock);
+
+                status = try_to_fill_dentry(dentry, 0);
+                if (status)
+                        goto out_error;
+
+                /*
+                 * The mount succeeded but if there is no root mount
+                 * it must be an autofs multi-mount with no root offset
+                 * so we don't need to follow the mount.
+                 */
+                if (d_mountpoint(dentry)) {
+                        if (!autofs4_follow_mount(&nd->mnt, &nd->dentry)) {
+                                status = -ENOENT;
+                                goto out_error;
+                        }
+                }
+
+                goto done;
+        }
+        spin_unlock(&dcache_lock);
+
+done:
+        return NULL;
+
+out_error:
+        path_release(nd);
+        return ERR_PTR(status);
 }
 
 /*
@@ -384,47 +398,43 @@ static int try_to_fill_dentry(struct vfsmount *mnt, struct dentry *dentry, int f
  * yet completely filled in, and revalidate has to delay such
  * lookups..
  */
-static int autofs4_revalidate(struct dentry * dentry, struct nameidata *nd)
+static int autofs4_revalidate(struct dentry *dentry, struct nameidata *nd)
 {
-        struct inode * dir = dentry->d_parent->d_inode;
+        struct inode *dir = dentry->d_parent->d_inode;
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
         int oz_mode = autofs4_oz_mode(sbi);
         int flags = nd ? nd->flags : 0;
-        int status = 1;
+        int status = 0;
 
         /* Pending dentry */
         if (autofs4_ispending(dentry)) {
                 if (!oz_mode)
-                        status = try_to_fill_dentry(nd->mnt, dentry, flags);
-                return status;
+                        status = try_to_fill_dentry(dentry, flags);
+                return !status;
         }
 
         /* Negative dentry.. invalidate if "old" */
         if (dentry->d_inode == NULL)
-                return (dentry->d_time - jiffies <= AUTOFS_NEGATIVE_TIMEOUT);
+                return 0;
 
         /* Check for a non-mountpoint directory with no contents */
         spin_lock(&dcache_lock);
         if (S_ISDIR(dentry->d_inode->i_mode) &&
             !d_mountpoint(dentry) && 
-            list_empty(&dentry->d_subdirs)) {
+            __simple_empty(dentry)) {
                 DPRINTK("dentry=%p %.*s, emptydir",
                          dentry, dentry->d_name.len, dentry->d_name.name);
                 spin_unlock(&dcache_lock);
                 if (!oz_mode)
-                        status = try_to_fill_dentry(nd->mnt, dentry, flags);
-                return status;
+                        status = try_to_fill_dentry(dentry, flags);
+                return !status;
         }
         spin_unlock(&dcache_lock);
 
-        /* Update the usage list */
-        if (!oz_mode)
-                autofs4_update_usage(nd->mnt, dentry);
-
         return 1;
 }
 
-static void autofs4_dentry_release(struct dentry *de)
+void autofs4_dentry_release(struct dentry *de)
 {
         struct autofs_info *inf;
 
@@ -462,12 +472,13 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
         DPRINTK("name = %.*s",
                 dentry->d_name.len, dentry->d_name.name);
 
+        /* File name too long to exist */
         if (dentry->d_name.len > NAME_MAX)
-                return ERR_PTR(-ENAMETOOLONG);/* File name too long to exist */
+                return ERR_PTR(-ENAMETOOLONG);
 
         sbi = autofs4_sbi(dir->i_sb);
-
         oz_mode = autofs4_oz_mode(sbi);
+
         DPRINTK("pid = %u, pgrp = %u, catatonic = %d, oz_mode = %d",
                  current->pid, process_group(current), sbi->catatonic, oz_mode);
 
@@ -519,7 +530,7 @@ static struct dentry *autofs4_lookup(struct inode *dir, struct dentry *dentry, s
          * doesn't do the right thing for all system calls, but it should
          * be OK for the operations we permit from an autofs.
          */
-        if ( dentry->d_inode && d_unhashed(dentry) )
+        if (dentry->d_inode && d_unhashed(dentry))
                 return ERR_PTR(-ENOENT);
 
         return NULL;
@@ -531,6 +542,7 @@ static int autofs4_dir_symlink(struct inode *dir,
 {
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
         struct autofs_info *ino = autofs4_dentry_ino(dentry);
+        struct autofs_info *p_ino;
         struct inode *inode;
         char *cp;
 
@@ -564,6 +576,10 @@ static int autofs4_dir_symlink(struct inode *dir,
 
         dentry->d_fsdata = ino;
         ino->dentry = dget(dentry);
+        atomic_inc(&ino->count);
+        p_ino = autofs4_dentry_ino(dentry->d_parent);
+        if (p_ino && dentry->d_parent != dentry)
+                atomic_inc(&p_ino->count);
         ino->inode = inode;
 
         dir->i_mtime = CURRENT_TIME;
@@ -590,11 +606,17 @@ static int autofs4_dir_unlink(struct inode *dir, struct dentry *dentry)
 {
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
         struct autofs_info *ino = autofs4_dentry_ino(dentry);
+        struct autofs_info *p_ino;
         
         /* This allows root to remove symlinks */
         if ( !autofs4_oz_mode(sbi) && !capable(CAP_SYS_ADMIN) )
                 return -EACCES;
 
+        if (atomic_dec_and_test(&ino->count)) {
+                p_ino = autofs4_dentry_ino(dentry->d_parent);
+                if (p_ino && dentry->d_parent != dentry)
+                        atomic_dec(&p_ino->count);
+        }
         dput(ino->dentry);
 
         dentry->d_inode->i_size = 0;
@@ -611,6 +633,7 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
 {
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
         struct autofs_info *ino = autofs4_dentry_ino(dentry);
+        struct autofs_info *p_ino;
         
         if (!autofs4_oz_mode(sbi))
                 return -EACCES;
@@ -625,8 +648,12 @@ static int autofs4_dir_rmdir(struct inode *dir, struct dentry *dentry)
         spin_unlock(&dentry->d_lock);
         spin_unlock(&dcache_lock);
 
+        if (atomic_dec_and_test(&ino->count)) {
+                p_ino = autofs4_dentry_ino(dentry->d_parent);
+                if (p_ino && dentry->d_parent != dentry)
+                        atomic_dec(&p_ino->count);
+        }
         dput(ino->dentry);
-
         dentry->d_inode->i_size = 0;
         dentry->d_inode->i_nlink = 0;
 
@@ -640,6 +667,7 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 {
         struct autofs_sb_info *sbi = autofs4_sbi(dir->i_sb);
         struct autofs_info *ino = autofs4_dentry_ino(dentry);
+        struct autofs_info *p_ino;
         struct inode *inode;
 
         if ( !autofs4_oz_mode(sbi) )
@@ -662,6 +690,10 @@ static int autofs4_dir_mkdir(struct inode *dir, struct dentry *dentry, int mode)
 
         dentry->d_fsdata = ino;
         ino->dentry = dget(dentry);
+        atomic_inc(&ino->count);
+        p_ino = autofs4_dentry_ino(dentry->d_parent);
+        if (p_ino && dentry->d_parent != dentry)
+                atomic_inc(&p_ino->count);
         ino->inode = inode;
         dir->i_nlink++;
         dir->i_mtime = CURRENT_TIME;
@@ -745,7 +777,7 @@ static inline int autofs4_ask_umount(struct vfsmount *mnt, int __user *p)
 {
         int status = 0;
 
-        if (may_umount(mnt) == 0)
+        if (may_umount(mnt))
                 status = 1;
 
         DPRINTK("returning %d", status);
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c
index be78e9378c03..142ab6aa2aa1 100644
--- a/fs/autofs4/waitq.c
+++ b/fs/autofs4/waitq.c
@@ -3,7 +3,7 @@
  * linux/fs/autofs/waitq.c
  *
  *  Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
- *  Copyright 2001-2003 Ian Kent <raven@themaw.net>
+ *  Copyright 2001-2006 Ian Kent <raven@themaw.net>
  *
  * This file is part of the Linux kernel and is made available under
  * the terms of the GNU General Public License, version 2, or at your
@@ -33,7 +33,7 @@ void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
         sbi->catatonic = 1;
         wq = sbi->queues;
         sbi->queues = NULL;     /* Erase all wait queues */
-        while ( wq ) {
+        while (wq) {
                 nwq = wq->next;
                 wq->status = -ENOENT; /* Magic is gone - report failure */
                 kfree(wq->name);
@@ -45,7 +45,6 @@ void autofs4_catatonic_mode(struct autofs_sb_info *sbi)
                 fput(sbi->pipe);        /* Close the pipe */
                 sbi->pipe = NULL;
         }
-
         shrink_dcache_sb(sbi->sb);
 }
 
@@ -98,7 +97,10 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
 
         pkt.hdr.proto_version = sbi->version;
         pkt.hdr.type = type;
-        if (type == autofs_ptype_missing) {
+        switch (type) {
+        /* Kernel protocol v4 missing and expire packets */
+        case autofs_ptype_missing:
+        {
                 struct autofs_packet_missing *mp = &pkt.missing;
 
                 pktsz = sizeof(*mp);
@@ -107,7 +109,10 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
                 mp->len = wq->len;
                 memcpy(mp->name, wq->name, wq->len);
                 mp->name[wq->len] = '\0';
-        } else if (type == autofs_ptype_expire_multi) {
+                break;
+        }
+        case autofs_ptype_expire_multi:
+        {
                 struct autofs_packet_expire_multi *ep = &pkt.expire_multi;
 
                 pktsz = sizeof(*ep);
@@ -116,7 +121,34 @@ static void autofs4_notify_daemon(struct autofs_sb_info *sbi,
                 ep->len = wq->len;
                 memcpy(ep->name, wq->name, wq->len);
                 ep->name[wq->len] = '\0';
-        } else {
+                break;
+        }
+        /*
+         * Kernel protocol v5 packet for handling indirect and direct
+         * mount missing and expire requests
+         */
+        case autofs_ptype_missing_indirect:
+        case autofs_ptype_expire_indirect:
+        case autofs_ptype_missing_direct:
+        case autofs_ptype_expire_direct:
+        {
+                struct autofs_v5_packet *packet = &pkt.v5_packet;
+
+                pktsz = sizeof(*packet);
+
+                packet->wait_queue_token = wq->wait_queue_token;
+                packet->len = wq->len;
+                memcpy(packet->name, wq->name, wq->len);
+                packet->name[wq->len] = '\0';
+                packet->dev = wq->dev;
+                packet->ino = wq->ino;
+                packet->uid = wq->uid;
+                packet->gid = wq->gid;
+                packet->pid = wq->pid;
+                packet->tgid = wq->tgid;
+                break;
+        }
+        default:
                 printk("autofs4_notify_daemon: bad type %d!\n", type);
                 return;
         }
@@ -162,21 +194,29 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
 {
         struct autofs_wait_queue *wq;
         char *name;
-        int len, status;
+        unsigned int len = 0;
+        unsigned int hash = 0;
+        int status;
 
         /* In catatonic mode, we don't wait for nobody */
-        if ( sbi->catatonic )
+        if (sbi->catatonic)
                 return -ENOENT;
         
         name = kmalloc(NAME_MAX + 1, GFP_KERNEL);
         if (!name)
                 return -ENOMEM;
 
-        len = autofs4_getpath(sbi, dentry, &name);
-        if (!len) {
-                kfree(name);
-                return -ENOENT;
+        /* If this is a direct mount request create a dummy name */
+        if (IS_ROOT(dentry) && (sbi->type & AUTOFS_TYPE_DIRECT))
+                len = sprintf(name, "%p", dentry);
+        else {
+                len = autofs4_getpath(sbi, dentry, &name);
+                if (!len) {
+                        kfree(name);
+                        return -ENOENT;
+                }
         }
+        hash = full_name_hash(name, len);
 
         if (mutex_lock_interruptible(&sbi->wq_mutex)) {
                 kfree(name);
@@ -190,7 +230,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                         break;
         }
 
-        if ( !wq ) {
+        if (!wq) {
                 /* Can't wait for an expire if there's no mount */
                 if (notify == NFY_NONE && !d_mountpoint(dentry)) {
                         kfree(name);
@@ -200,7 +240,7 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
 
                 /* Create a new wait queue */
                 wq = kmalloc(sizeof(struct autofs_wait_queue),GFP_KERNEL);
-                if ( !wq ) {
+                if (!wq) {
                         kfree(name);
                         mutex_unlock(&sbi->wq_mutex);
                         return -ENOMEM;
@@ -212,12 +252,18 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                 wq->next = sbi->queues;
                 sbi->queues = wq;
                 init_waitqueue_head(&wq->queue);
-                wq->hash = dentry->d_name.hash;
+                wq->hash = hash;
                 wq->name = name;
                 wq->len = len;
+                wq->dev = autofs4_get_dev(sbi);
+                wq->ino = autofs4_get_ino(sbi);
+                wq->uid = current->uid;
+                wq->gid = current->gid;
+                wq->pid = current->pid;
+                wq->tgid = current->tgid;
                 wq->status = -EINTR; /* Status return if interrupted */
                 atomic_set(&wq->wait_ctr, 2);
-                atomic_set(&wq->notified, 1);
+                atomic_set(&wq->notify, 1);
                 mutex_unlock(&sbi->wq_mutex);
         } else {
                 atomic_inc(&wq->wait_ctr);
@@ -227,9 +273,26 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
                         (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify);
         }
 
-        if (notify != NFY_NONE && atomic_dec_and_test(&wq->notified)) {
-                int type = (notify == NFY_MOUNT ?
-                        autofs_ptype_missing : autofs_ptype_expire_multi);
+        if (notify != NFY_NONE && atomic_read(&wq->notify)) {
+                int type;
+
+                atomic_dec(&wq->notify);
+
+                if (sbi->version < 5) {
+                        if (notify == NFY_MOUNT)
+                                type = autofs_ptype_missing;
+                        else
+                                type = autofs_ptype_expire_multi;
+                } else {
+                        if (notify == NFY_MOUNT)
+                                type = (sbi->type & AUTOFS_TYPE_DIRECT) ?
+                                        autofs_ptype_missing_direct :
+                                         autofs_ptype_missing_indirect;
+                        else
+                                type = (sbi->type & AUTOFS_TYPE_DIRECT) ?
+                                        autofs_ptype_expire_direct :
+                                        autofs_ptype_expire_indirect;
+                }
 
                 DPRINTK("new wait id = 0x%08lx, name = %.*s, nfy=%d\n",
                         (unsigned long) wq->wait_queue_token, wq->len, wq->name, notify);
@@ -240,14 +303,14 @@ int autofs4_wait(struct autofs_sb_info *sbi, struct dentry *dentry,
 
         /* wq->name is NULL if and only if the lock is already released */
 
-        if ( sbi->catatonic ) {
+        if (sbi->catatonic) {
                 /* We might have slept, so check again for catatonic mode */
                 wq->status = -ENOENT;
                 kfree(wq->name);
                 wq->name = NULL;
         }
 
-        if ( wq->name ) {
+        if (wq->name) {
                 /* Block all but "shutdown" signals while waiting */
                 sigset_t oldset;
                 unsigned long irqflags;
@@ -283,12 +346,12 @@ int autofs4_wait_release(struct autofs_sb_info *sbi, autofs_wqt_t wait_queue_tok
         struct autofs_wait_queue *wq, **wql;
 
         mutex_lock(&sbi->wq_mutex);
-        for ( wql = &sbi->queues ; (wq = *wql) != 0 ; wql = &wq->next ) {
-                if ( wq->wait_queue_token == wait_queue_token )
+        for (wql = &sbi->queues ; (wq = *wql) != 0 ; wql = &wq->next) {
+                if (wq->wait_queue_token == wait_queue_token)
                         break;
         }
 
-        if ( !wq ) {
+        if (!wq) {
                 mutex_unlock(&sbi->wq_mutex);
                 return -EINVAL;
         }
diff --git a/fs/bad_inode.c b/fs/bad_inode.c
index e172180a1d8c..80599ae33966 100644
--- a/fs/bad_inode.c
+++ b/fs/bad_inode.c
@@ -22,7 +22,7 @@ static int return_EIO(void)
 
 #define EIO_ERROR ((void *) (return_EIO))
 
-static struct file_operations bad_file_ops =
+static const struct file_operations bad_file_ops =
 {
         .llseek         = EIO_ERROR,
         .aio_read       = EIO_ERROR,
diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
index 044a59587829..68ebd10f345d 100644
--- a/fs/befs/linuxvfs.c
+++ b/fs/befs/linuxvfs.c
@@ -64,7 +64,7 @@ static const struct super_operations befs_sops = {
 /* slab cache for befs_inode_info objects */
 static kmem_cache_t *befs_inode_cachep;
 
-static struct file_operations befs_dir_operations = {
+static const struct file_operations befs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = befs_readdir,
 };
diff --git a/fs/bfs/bfs.h b/fs/bfs/bfs.h
index 1fbc53f14aba..9d791004b21c 100644
--- a/fs/bfs/bfs.h
+++ b/fs/bfs/bfs.h
@@ -49,11 +49,11 @@ static inline struct bfs_inode_info *BFS_I(struct inode *inode)
 
 /* file.c */
 extern struct inode_operations bfs_file_inops;
-extern struct file_operations bfs_file_operations;
+extern const struct file_operations bfs_file_operations;
 extern struct address_space_operations bfs_aops;
 
 /* dir.c */
 extern struct inode_operations bfs_dir_inops;
-extern struct file_operations bfs_dir_operations;
+extern const struct file_operations bfs_dir_operations;
 
 #endif /* _FS_BFS_BFS_H */
diff --git a/fs/bfs/dir.c b/fs/bfs/dir.c
index 5af928fa0449..26fad9621738 100644
--- a/fs/bfs/dir.c
+++ b/fs/bfs/dir.c
@@ -70,7 +70,7 @@ static int bfs_readdir(struct file * f, void * dirent, filldir_t filldir)
         return 0;       
 }
 
-struct file_operations bfs_dir_operations = {
+const struct file_operations bfs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = bfs_readdir,
         .fsync          = file_fsync,
diff --git a/fs/bfs/file.c b/fs/bfs/file.c
index 807723b65daf..d83cd74a2e4e 100644
--- a/fs/bfs/file.c
+++ b/fs/bfs/file.c
@@ -17,7 +17,7 @@
 #define dprintf(x...)
 #endif
 
-struct file_operations bfs_file_operations = {
+const struct file_operations bfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 6a7b730c206b..d73d75591a39 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -600,7 +600,7 @@ static ssize_t bm_entry_write(struct file *file, const char __user *buffer,
         return count;
 }
 
-static struct file_operations bm_entry_operations = {
+static const struct file_operations bm_entry_operations = {
         .read           = bm_entry_read,
         .write          = bm_entry_write,
 };
@@ -668,7 +668,7 @@ out:
         return count;
 }
 
-static struct file_operations bm_register_operations = {
+static const struct file_operations bm_register_operations = {
         .write          = bm_register_write,
 };
 
@@ -715,7 +715,7 @@ static ssize_t bm_status_write(struct file * file, const char __user * buffer,
         return count;
 }
 
-static struct file_operations bm_status_operations = {
+static const struct file_operations bm_status_operations = {
         .read           = bm_status_read,
         .write          = bm_status_write,
 };
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 5983d42df015..af88c43043d5 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -266,6 +266,9 @@ static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
                 mutex_init(&bdev->bd_mount_mutex);
                 INIT_LIST_HEAD(&bdev->bd_inodes);
                 INIT_LIST_HEAD(&bdev->bd_list);
+#ifdef CONFIG_SYSFS
+                INIT_LIST_HEAD(&bdev->bd_holder_list);
+#endif
                 inode_init_once(&ei->vfs_inode);
         }
 }
@@ -490,6 +493,300 @@ void bd_release(struct block_device *bdev)
 
 EXPORT_SYMBOL(bd_release);
 
+#ifdef CONFIG_SYSFS
+/*
+ * Functions for bd_claim_by_kobject / bd_release_from_kobject
+ *
+ *     If a kobject is passed to bd_claim_by_kobject()
+ *     and the kobject has a parent directory,
+ *     following symlinks are created:
+ *        o from the kobject to the claimed bdev
+ *        o from "holders" directory of the bdev to the parent of the kobject
+ *     bd_release_from_kobject() removes these symlinks.
+ *
+ *     Example:
+ *        If /dev/dm-0 maps to /dev/sda, kobject corresponding to
+ *        /sys/block/dm-0/slaves is passed to bd_claim_by_kobject(), then:
+ *           /sys/block/dm-0/slaves/sda --> /sys/block/sda
+ *           /sys/block/sda/holders/dm-0 --> /sys/block/dm-0
+ */
+
+static struct kobject *bdev_get_kobj(struct block_device *bdev)
+{
+        if (bdev->bd_contains != bdev)
+                return kobject_get(&bdev->bd_part->kobj);
+        else
+                return kobject_get(&bdev->bd_disk->kobj);
+}
+
+static struct kobject *bdev_get_holder(struct block_device *bdev)
+{
+        if (bdev->bd_contains != bdev)
+                return kobject_get(bdev->bd_part->holder_dir);
+        else
+                return kobject_get(bdev->bd_disk->holder_dir);
+}
+
+static void add_symlink(struct kobject *from, struct kobject *to)
+{
+        if (!from || !to)
+                return;
+        sysfs_create_link(from, to, kobject_name(to));
+}
+
+static void del_symlink(struct kobject *from, struct kobject *to)
+{
+        if (!from || !to)
+                return;
+        sysfs_remove_link(from, kobject_name(to));
+}
+
+/*
+ * 'struct bd_holder' contains pointers to kobjects symlinked by
+ * bd_claim_by_kobject.
+ * It's connected to bd_holder_list which is protected by bdev->bd_sem.
+ */
+struct bd_holder {
+        struct list_head list;  /* chain of holders of the bdev */
+        int count;              /* references from the holder */
+        struct kobject *sdir;   /* holder object, e.g. "/block/dm-0/slaves" */
+        struct kobject *hdev;   /* e.g. "/block/dm-0" */
+        struct kobject *hdir;   /* e.g. "/block/sda/holders" */
+        struct kobject *sdev;   /* e.g. "/block/sda" */
+};
+
+/*
+ * Get references of related kobjects at once.
+ * Returns 1 on success. 0 on failure.
+ *
+ * Should call bd_holder_release_dirs() after successful use.
+ */
+static int bd_holder_grab_dirs(struct block_device *bdev,
+                        struct bd_holder *bo)
+{
+        if (!bdev || !bo)
+                return 0;
+
+        bo->sdir = kobject_get(bo->sdir);
+        if (!bo->sdir)
+                return 0;
+
+        bo->hdev = kobject_get(bo->sdir->parent);
+        if (!bo->hdev)
+                goto fail_put_sdir;
+
+        bo->sdev = bdev_get_kobj(bdev);
+        if (!bo->sdev)
+                goto fail_put_hdev;
+
+        bo->hdir = bdev_get_holder(bdev);
+        if (!bo->hdir)
+                goto fail_put_sdev;
+
+        return 1;
+
+fail_put_sdev:
+        kobject_put(bo->sdev);
+fail_put_hdev:
+        kobject_put(bo->hdev);
+fail_put_sdir:
+        kobject_put(bo->sdir);
+
+        return 0;
+}
+
+/* Put references of related kobjects at once. */
+static void bd_holder_release_dirs(struct bd_holder *bo)
+{
+        kobject_put(bo->hdir);
+        kobject_put(bo->sdev);
+        kobject_put(bo->hdev);
+        kobject_put(bo->sdir);
+}
+
+static struct bd_holder *alloc_bd_holder(struct kobject *kobj)
+{
+        struct bd_holder *bo;
+
+        bo = kzalloc(sizeof(*bo), GFP_KERNEL);
+        if (!bo)
+                return NULL;
+
+        bo->count = 1;
+        bo->sdir = kobj;
+
+        return bo;
+}
+
+static void free_bd_holder(struct bd_holder *bo)
+{
+        kfree(bo);
+}
+
+/**
+ * add_bd_holder - create sysfs symlinks for bd_claim() relationship
+ *
+ * @bdev:       block device to be bd_claimed
+ * @bo:         preallocated and initialized by alloc_bd_holder()
+ *
+ * If there is no matching entry with @bo in @bdev->bd_holder_list,
+ * add @bo to the list, create symlinks.
+ *
+ * Returns 1 if @bo was added to the list.
+ * Returns 0 if @bo wasn't used by any reason and should be freed.
+ */
+static int add_bd_holder(struct block_device *bdev, struct bd_holder *bo)
+{
+        struct bd_holder *tmp;
+
+        if (!bo)
+                return 0;
+
+        list_for_each_entry(tmp, &bdev->bd_holder_list, list) {
+                if (tmp->sdir == bo->sdir) {
+                        tmp->count++;
+                        return 0;
+                }
+        }
+
+        if (!bd_holder_grab_dirs(bdev, bo))
+                return 0;
+
+        add_symlink(bo->sdir, bo->sdev);
+        add_symlink(bo->hdir, bo->hdev);
+        list_add_tail(&bo->list, &bdev->bd_holder_list);
+        return 1;
+}
+
+/**
+ * del_bd_holder - delete sysfs symlinks for bd_claim() relationship
+ *
+ * @bdev:       block device to be bd_claimed
+ * @kobj:       holder's kobject
+ *
+ * If there is matching entry with @kobj in @bdev->bd_holder_list
+ * and no other bd_claim() from the same kobject,
+ * remove the struct bd_holder from the list, delete symlinks for it.
+ *
+ * Returns a pointer to the struct bd_holder when it's removed from the list
+ * and ready to be freed.
+ * Returns NULL if matching claim isn't found or there is other bd_claim()
+ * by the same kobject.
+ */
+static struct bd_holder *del_bd_holder(struct block_device *bdev,
+                                        struct kobject *kobj)
+{
+        struct bd_holder *bo;
+
+        list_for_each_entry(bo, &bdev->bd_holder_list, list) {
+                if (bo->sdir == kobj) {
+                        bo->count--;
+                        BUG_ON(bo->count < 0);
+                        if (!bo->count) {
+                                list_del(&bo->list);
+                                del_symlink(bo->sdir, bo->sdev);
+                                del_symlink(bo->hdir, bo->hdev);
+                                bd_holder_release_dirs(bo);
+                                return bo;
+                        }
+                        break;
+                }
+        }
+
+        return NULL;
+}
+
+/**
+ * bd_claim_by_kobject - bd_claim() with additional kobject signature
+ *
+ * @bdev:       block device to be claimed
+ * @holder:     holder's signature
+ * @kobj:       holder's kobject
+ *
+ * Do bd_claim() and if it succeeds, create sysfs symlinks between
+ * the bdev and the holder's kobject.
+ * Use bd_release_from_kobject() when relesing the claimed bdev.
+ *
+ * Returns 0 on success. (same as bd_claim())
+ * Returns errno on failure.
+ */
+static int bd_claim_by_kobject(struct block_device *bdev, void *holder,
+                                struct kobject *kobj)
+{
+        int res;
+        struct bd_holder *bo;
+
+        if (!kobj)
+                return -EINVAL;
+
+        bo = alloc_bd_holder(kobj);
+        if (!bo)
+                return -ENOMEM;
+
+        mutex_lock(&bdev->bd_mutex);
+        res = bd_claim(bdev, holder);
+        if (res || !add_bd_holder(bdev, bo))
+                free_bd_holder(bo);
+        mutex_unlock(&bdev->bd_mutex);
+
+        return res;
+}
+
+/**
+ * bd_release_from_kobject - bd_release() with additional kobject signature
+ *
+ * @bdev:       block device to be released
+ * @kobj:       holder's kobject
+ *
+ * Do bd_release() and remove sysfs symlinks created by bd_claim_by_kobject().
+ */
+static void bd_release_from_kobject(struct block_device *bdev,
+                                        struct kobject *kobj)
+{
+        struct bd_holder *bo;
+
+        if (!kobj)
+                return;
+
+        mutex_lock(&bdev->bd_mutex);
+        bd_release(bdev);
+        if ((bo = del_bd_holder(bdev, kobj)))
+                free_bd_holder(bo);
+        mutex_unlock(&bdev->bd_mutex);
+}
+
+/**
+ * bd_claim_by_disk - wrapper function for bd_claim_by_kobject()
+ *
+ * @bdev:       block device to be claimed
+ * @holder:     holder's signature
+ * @disk:       holder's gendisk
+ *
+ * Call bd_claim_by_kobject() with getting @disk->slave_dir.
+ */
+int bd_claim_by_disk(struct block_device *bdev, void *holder,
+                        struct gendisk *disk)
+{
+        return bd_claim_by_kobject(bdev, holder, kobject_get(disk->slave_dir));
+}
+EXPORT_SYMBOL_GPL(bd_claim_by_disk);
+
+/**
+ * bd_release_from_disk - wrapper function for bd_release_from_kobject()
+ *
+ * @bdev:       block device to be claimed
+ * @disk:       holder's gendisk
+ *
+ * Call bd_release_from_kobject() and put @disk->slave_dir.
+ */
+void bd_release_from_disk(struct block_device *bdev, struct gendisk *disk)
+{
+        bd_release_from_kobject(bdev, disk->slave_dir);
+        kobject_put(disk->slave_dir);
+}
+EXPORT_SYMBOL_GPL(bd_release_from_disk);
+#endif
+
 /*
  * Tries to open block device by device number.  Use it ONLY if you
  * really do not have anything better - i.e. when you are behind a
@@ -790,7 +1087,7 @@ struct address_space_operations def_blk_aops = {
         .direct_IO      = blkdev_direct_IO,
 };
 
-struct file_operations def_blk_fops = {
+const struct file_operations def_blk_fops = {
         .open           = blkdev_open,
         .release        = blkdev_close,
         .llseek         = block_llseek,
diff --git a/fs/buffer.c b/fs/buffer.c
index d597758dd129..23f1f3a68077 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -493,7 +493,7 @@ static void free_more_memory(void)
         wakeup_pdflush(1024);
         yield();
 
-        for_each_pgdat(pgdat) {
+        for_each_online_pgdat(pgdat) {
                 zones = pgdat->node_zonelists[gfp_zone(GFP_NOFS)].zones;
                 if (*zones)
                         try_to_free_pages(zones, GFP_NOFS);
diff --git a/fs/char_dev.c b/fs/char_dev.c
index 8c6eb04d31e2..4e1b849f912f 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -250,7 +250,7 @@ int alloc_chrdev_region(dev_t *dev, unsigned baseminor, unsigned count,
 }
 
 int register_chrdev(unsigned int major, const char *name,
-                    struct file_operations *fops)
+                    const struct file_operations *fops)
 {
         struct char_device_struct *cd;
         struct cdev *cdev;
@@ -406,7 +406,7 @@ static void cdev_purge(struct cdev *cdev)
  * is contain the open that then fills in the correct operations
  * depending on the special file...
  */
-struct file_operations def_chr_fops = {
+const struct file_operations def_chr_fops = {
         .open = chrdev_open,
 };
 
@@ -473,7 +473,7 @@ struct cdev *cdev_alloc(void)
         return p;
 }
 
-void cdev_init(struct cdev *cdev, struct file_operations *fops)
+void cdev_init(struct cdev *cdev, const struct file_operations *fops)
 {
         memset(cdev, 0, sizeof *cdev);
         INIT_LIST_HEAD(&cdev->list);
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 6b99b51d6694..4bbc544857bc 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -583,7 +583,7 @@ struct inode_operations cifs_symlink_inode_ops = {
 #endif 
 };
 
-struct file_operations cifs_file_ops = {
+const struct file_operations cifs_file_ops = {
         .read = do_sync_read,
         .write = do_sync_write,
         .readv = generic_file_readv,
@@ -607,7 +607,7 @@ struct file_operations cifs_file_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_file_direct_ops = {
+const struct file_operations cifs_file_direct_ops = {
         /* no mmap, no aio, no readv - 
            BB reevaluate whether they can be done with directio, no cache */
         .read = cifs_user_read,
@@ -626,7 +626,7 @@ struct file_operations cifs_file_direct_ops = {
         .dir_notify = cifs_dir_notify,
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
-struct file_operations cifs_file_nobrl_ops = {
+const struct file_operations cifs_file_nobrl_ops = {
         .read = do_sync_read,
         .write = do_sync_write,
         .readv = generic_file_readv,
@@ -649,7 +649,7 @@ struct file_operations cifs_file_nobrl_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_file_direct_nobrl_ops = {
+const struct file_operations cifs_file_direct_nobrl_ops = {
         /* no mmap, no aio, no readv - 
            BB reevaluate whether they can be done with directio, no cache */
         .read = cifs_user_read,
@@ -668,7 +668,7 @@ struct file_operations cifs_file_direct_nobrl_ops = {
 #endif /* CONFIG_CIFS_EXPERIMENTAL */
 };
 
-struct file_operations cifs_dir_ops = {
+const struct file_operations cifs_dir_ops = {
         .readdir = cifs_readdir,
         .release = cifs_closedir,
         .read    = generic_read_dir,
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index 821a8eb22559..74f405ae4da3 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -61,10 +61,10 @@ extern struct inode_operations cifs_file_inode_ops;
 extern struct inode_operations cifs_symlink_inode_ops;
 
 /* Functions related to files and directories */
-extern struct file_operations cifs_file_ops;
-extern struct file_operations cifs_file_direct_ops; /* if directio mount */
-extern struct file_operations cifs_file_nobrl_ops;
-extern struct file_operations cifs_file_direct_nobrl_ops; /* if directio mount */
+extern const struct file_operations cifs_file_ops;
+extern const struct file_operations cifs_file_direct_ops; /* if directio mount */
+extern const struct file_operations cifs_file_nobrl_ops;
+extern const struct file_operations cifs_file_direct_nobrl_ops; /* if directio mount */
 extern int cifs_open(struct inode *inode, struct file *file);
 extern int cifs_close(struct inode *inode, struct file *file);
 extern int cifs_closedir(struct inode *inode, struct file *file);
@@ -76,7 +76,7 @@ extern int cifs_lock(struct file *, int, struct file_lock *);
 extern int cifs_fsync(struct file *, struct dentry *, int);
 extern int cifs_flush(struct file *);
 extern int cifs_file_mmap(struct file * , struct vm_area_struct *);
-extern struct file_operations cifs_dir_ops;
+extern const struct file_operations cifs_dir_ops;
 extern int cifs_dir_open(struct inode *inode, struct file *file);
 extern int cifs_readdir(struct file *file, void *direntry, filldir_t filldir);
 extern int cifs_dir_notify(struct file *, unsigned long arg);
diff --git a/fs/coda/dir.c b/fs/coda/dir.c
index 54f76de8a686..71f2ea632e53 100644
--- a/fs/coda/dir.c
+++ b/fs/coda/dir.c
@@ -82,7 +82,7 @@ struct inode_operations coda_dir_inode_operations =
         .setattr        = coda_setattr,
 };
 
-struct file_operations coda_dir_operations = {
+const struct file_operations coda_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = coda_readdir,
diff --git a/fs/coda/file.c b/fs/coda/file.c
index 146a991d6eb5..7c2642431fa5 100644
--- a/fs/coda/file.c
+++ b/fs/coda/file.c
@@ -288,7 +288,7 @@ int coda_fsync(struct file *coda_file, struct dentry *coda_dentry, int datasync)
         return err;
 }
 
-struct file_operations coda_file_operations = {
+const struct file_operations coda_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = coda_file_read,
         .write          = coda_file_write,
diff --git a/fs/coda/pioctl.c b/fs/coda/pioctl.c
index 127714936c66..214822be87bd 100644
--- a/fs/coda/pioctl.c
+++ b/fs/coda/pioctl.c
@@ -36,7 +36,7 @@ struct inode_operations coda_ioctl_inode_operations =
         .setattr        = coda_setattr,
 };
 
-struct file_operations coda_ioctl_operations = {
+const struct file_operations coda_ioctl_operations = {
         .owner          = THIS_MODULE,
         .ioctl          = coda_pioctl,
 };
diff --git a/fs/coda/psdev.c b/fs/coda/psdev.c
index 98c74fe2e139..6c6771db36da 100644
--- a/fs/coda/psdev.c
+++ b/fs/coda/psdev.c
@@ -342,7 +342,7 @@ static int coda_psdev_release(struct inode * inode, struct file * file)
 }
 
 
-static struct file_operations coda_psdev_fops = {
+static const struct file_operations coda_psdev_fops = {
         .owner          = THIS_MODULE,
         .read           = coda_psdev_read,
         .write          = coda_psdev_write,
diff --git a/fs/compat.c b/fs/compat.c
index ef5a0771592d..7f8e26ea427c 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -1639,15 +1639,6 @@ void compat_set_fd_set(unsigned long nr, compat_ulong_t __user *ufdset,
  * This is a virtual copy of sys_select from fs/select.c and probably
  * should be compared to it from time to time
  */
-static void *select_bits_alloc(int size)
-{
-        return kmalloc(6 * size, GFP_KERNEL);
-}
-
-static void select_bits_free(void *bits, int size)
-{
-        kfree(bits);
-}
 
 /*
  * We can actually return ERESTARTSYS instead of EINTR, but I'd
@@ -1686,7 +1677,7 @@ int compat_core_sys_select(int n, compat_ulong_t __user *inp,
          */
         ret = -ENOMEM;
         size = FDS_BYTES(n);
-        bits = select_bits_alloc(size);
+        bits = kmalloc(6 * size, GFP_KERNEL);
         if (!bits)
                 goto out_nofds;
         fds.in      = (unsigned long *)  bits;
@@ -1720,7 +1711,7 @@ int compat_core_sys_select(int n, compat_ulong_t __user *inp,
         compat_set_fd_set(n, exp, fds.res_ex);
 
 out:
-        select_bits_free(bits, size);
+        kfree(bits);
 out_nofds:
         return ret;
 }
diff --git a/fs/configfs/configfs_internal.h b/fs/configfs/configfs_internal.h
index f70e46951b37..3f4ff7a242b9 100644
--- a/fs/configfs/configfs_internal.h
+++ b/fs/configfs/configfs_internal.h
@@ -72,9 +72,9 @@ extern void configfs_release_fs(void);
 
 extern struct rw_semaphore configfs_rename_sem;
 extern struct super_block * configfs_sb;
-extern struct file_operations configfs_dir_operations;
-extern struct file_operations configfs_file_operations;
-extern struct file_operations bin_fops;
+extern const struct file_operations configfs_dir_operations;
+extern const struct file_operations configfs_file_operations;
+extern const struct file_operations bin_fops;
 extern struct inode_operations configfs_dir_inode_operations;
 extern struct inode_operations configfs_symlink_inode_operations;
 
diff --git a/fs/configfs/dir.c b/fs/configfs/dir.c
index ca60e3abef45..8ed9b06a9828 100644
--- a/fs/configfs/dir.c
+++ b/fs/configfs/dir.c
@@ -1027,7 +1027,7 @@ static loff_t configfs_dir_lseek(struct file * file, loff_t offset, int origin)
         return offset;
 }
 
-struct file_operations configfs_dir_operations = {
+const struct file_operations configfs_dir_operations = {
         .open           = configfs_dir_open,
         .release        = configfs_dir_close,
         .llseek         = configfs_dir_lseek,
diff --git a/fs/configfs/file.c b/fs/configfs/file.c
index 3921920d8716..f499803743e0 100644
--- a/fs/configfs/file.c
+++ b/fs/configfs/file.c
@@ -322,7 +322,7 @@ static int configfs_release(struct inode * inode, struct file * filp)
         return 0;
 }
 
-struct file_operations configfs_file_operations = {
+const struct file_operations configfs_file_operations = {
         .read           = configfs_read_file,
         .write          = configfs_write_file,
         .llseek         = generic_file_llseek,
diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c
index acc1b2c10a86..9efcc3a164e8 100644
--- a/fs/cramfs/inode.c
+++ b/fs/cramfs/inode.c
@@ -29,7 +29,7 @@
 
 static struct super_operations cramfs_ops;
 static struct inode_operations cramfs_dir_inode_operations;
-static struct file_operations cramfs_directory_operations;
+static const struct file_operations cramfs_directory_operations;
 static struct address_space_operations cramfs_aops;
 
 static DEFINE_MUTEX(read_mutex);
@@ -512,7 +512,7 @@ static struct address_space_operations cramfs_aops = {
 /*
  * A directory can only readdir
  */
-static struct file_operations cramfs_directory_operations = {
+static const struct file_operations cramfs_directory_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = cramfs_readdir,
diff --git a/fs/debugfs/file.c b/fs/debugfs/file.c
index 40c4fc973fad..66a505422e5c 100644
--- a/fs/debugfs/file.c
+++ b/fs/debugfs/file.c
@@ -39,7 +39,7 @@ static int default_open(struct inode *inode, struct file *file)
         return 0;
 }
 
-struct file_operations debugfs_file_operations = {
+const struct file_operations debugfs_file_operations = {
         .read =         default_read_file,
         .write =        default_write_file,
         .open =         default_open,
@@ -213,7 +213,7 @@ static ssize_t write_file_bool(struct file *file, const char __user *user_buf,
         return count;
 }
 
-static struct file_operations fops_bool = {
+static const struct file_operations fops_bool = {
         .read =         read_file_bool,
         .write =        write_file_bool,
         .open =         default_open,
diff --git a/fs/debugfs/inode.c b/fs/debugfs/inode.c
index d4f1a2cddd47..85d166cdcae4 100644
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -191,7 +191,7 @@ static int debugfs_create_by_name(const char *name, mode_t mode,
  */
 struct dentry *debugfs_create_file(const char *name, mode_t mode,
                                    struct dentry *parent, void *data,
-                                   struct file_operations *fops)
+                                   const struct file_operations *fops)
 {
         struct dentry *dentry = NULL;
         int error;
diff --git a/fs/devfs/base.c b/fs/devfs/base.c
index b621521e09d4..52f5059c4f31 100644
--- a/fs/devfs/base.c
+++ b/fs/devfs/base.c
@@ -856,14 +856,14 @@ static int devfsd_close(struct inode *inode, struct file *file);
 #ifdef CONFIG_DEVFS_DEBUG
 static ssize_t stat_read(struct file *file, char __user *buf, size_t len,
                          loff_t * ppos);
-static struct file_operations stat_fops = {
+static const struct file_operations stat_fops = {
         .open = nonseekable_open,
         .read = stat_read,
 };
 #endif
 
 /*  Devfs daemon file operations  */
-static struct file_operations devfsd_fops = {
+static const struct file_operations devfsd_fops = {
         .open = nonseekable_open,
         .read = devfsd_read,
         .ioctl = devfsd_ioctl,
@@ -1842,8 +1842,8 @@ static int try_modload(struct devfs_entry *parent, struct fs_info *fs_info,
 
 static struct inode_operations devfs_iops;
 static struct inode_operations devfs_dir_iops;
-static struct file_operations devfs_fops;
-static struct file_operations devfs_dir_fops;
+static const struct file_operations devfs_fops;
+static const struct file_operations devfs_dir_fops;
 static struct inode_operations devfs_symlink_iops;
 
 static int devfs_notify_change(struct dentry *dentry, struct iattr *iattr)
@@ -2061,11 +2061,11 @@ static int devfs_open(struct inode *inode, struct file *file)
         return err;
 }                               /*  End Function devfs_open  */
 
-static struct file_operations devfs_fops = {
+static const struct file_operations devfs_fops = {
         .open = devfs_open,
 };
 
-static struct file_operations devfs_dir_fops = {
+static const struct file_operations devfs_dir_fops = {
         .read = generic_read_dir,
         .readdir = devfs_readdir,
 };
diff --git a/fs/efs/dir.c b/fs/efs/dir.c
index 777c614ff360..17f5b2d3c16a 100644
--- a/fs/efs/dir.c
+++ b/fs/efs/dir.c
@@ -10,7 +10,7 @@
 
 static int efs_readdir(struct file *, void *, filldir_t);
 
-struct file_operations efs_dir_operations = {
+const struct file_operations efs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = efs_readdir,
 };
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index e067a06c6464..242fe1a66ce5 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -290,7 +290,7 @@ static kmem_cache_t *pwq_cache __read_mostly;
 static struct vfsmount *eventpoll_mnt __read_mostly;
 
 /* File callbacks that implement the eventpoll file behaviour */
-static struct file_operations eventpoll_fops = {
+static const struct file_operations eventpoll_fops = {
         .release        = ep_eventpoll_close,
         .poll           = ep_eventpoll_poll
 };
diff --git a/fs/ext2/dir.c b/fs/ext2/dir.c
index 0165388c425c..d672aa9f4061 100644
--- a/fs/ext2/dir.c
+++ b/fs/ext2/dir.c
@@ -658,7 +658,7 @@ not_empty:
         return 0;
 }
 
-struct file_operations ext2_dir_operations = {
+const struct file_operations ext2_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = ext2_readdir,
diff --git a/fs/ext2/ext2.h b/fs/ext2/ext2.h
index 11035ac7986f..9f74a62be555 100644
--- a/fs/ext2/ext2.h
+++ b/fs/ext2/ext2.h
@@ -154,12 +154,12 @@ extern void ext2_write_super (struct super_block *);
  */
 
 /* dir.c */
-extern struct file_operations ext2_dir_operations;
+extern const struct file_operations ext2_dir_operations;
 
 /* file.c */
 extern struct inode_operations ext2_file_inode_operations;
-extern struct file_operations ext2_file_operations;
-extern struct file_operations ext2_xip_file_operations;
+extern const struct file_operations ext2_file_operations;
+extern const struct file_operations ext2_xip_file_operations;
 
 /* inode.c */
 extern struct address_space_operations ext2_aops;
diff --git a/fs/ext2/file.c b/fs/ext2/file.c
index a484412fc782..509cceca04db 100644
--- a/fs/ext2/file.c
+++ b/fs/ext2/file.c
@@ -39,7 +39,7 @@ static int ext2_release_file (struct inode * inode, struct file * filp)
  * We have mostly NULL's here: the current defaults are ok for
  * the ext2 filesystem.
  */
-struct file_operations ext2_file_operations = {
+const struct file_operations ext2_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
@@ -56,7 +56,7 @@ struct file_operations ext2_file_operations = {
 };
 
 #ifdef CONFIG_EXT2_FS_XIP
-struct file_operations ext2_xip_file_operations = {
+const struct file_operations ext2_xip_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = xip_file_read,
         .write          = xip_file_write,
diff --git a/fs/ext3/dir.c b/fs/ext3/dir.c
index 38bd3f6ec147..f37528ed222e 100644
--- a/fs/ext3/dir.c
+++ b/fs/ext3/dir.c
@@ -39,7 +39,7 @@ static int ext3_dx_readdir(struct file * filp,
 static int ext3_release_dir (struct inode * inode,
                                 struct file * filp);
 
-struct file_operations ext3_dir_operations = {
+const struct file_operations ext3_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = ext3_readdir,         /* we take BKL. needed?*/
diff --git a/fs/ext3/file.c b/fs/ext3/file.c
index 59098ea56711..783a796220bb 100644
--- a/fs/ext3/file.c
+++ b/fs/ext3/file.c
@@ -105,7 +105,7 @@ force_commit:
         return ret;
 }
 
-struct file_operations ext3_file_operations = {
+const struct file_operations ext3_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
diff --git a/fs/fat/dir.c b/fs/fat/dir.c
index 4095bc149eb1..698b85bb1dd4 100644
--- a/fs/fat/dir.c
+++ b/fs/fat/dir.c
@@ -741,7 +741,7 @@ static int fat_dir_ioctl(struct inode * inode, struct file * filp,
         return ret;
 }
 
-struct file_operations fat_dir_operations = {
+const struct file_operations fat_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = fat_readdir,
         .ioctl          = fat_dir_ioctl,
diff --git a/fs/fat/file.c b/fs/fat/file.c
index 88aa1ae13f9f..1ee25232e6af 100644
--- a/fs/fat/file.c
+++ b/fs/fat/file.c
@@ -112,7 +112,7 @@ int fat_generic_ioctl(struct inode *inode, struct file *filp,
         }
 }
 
-struct file_operations fat_file_operations = {
+const struct file_operations fat_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
diff --git a/fs/fat/inode.c b/fs/fat/inode.c
index 404bfc9f7385..c1ce284f8a94 100644
--- a/fs/fat/inode.c
+++ b/fs/fat/inode.c
@@ -1435,9 +1435,6 @@ out_fail:
 
 EXPORT_SYMBOL_GPL(fat_fill_super);
 
-int __init fat_cache_init(void);
-void fat_cache_destroy(void);
-
 static int __init init_fat_fs(void)
 {
         int err;
diff --git a/fs/fifo.c b/fs/fifo.c
index d13fcd3ec803..889f722ee36d 100644
--- a/fs/fifo.c
+++ b/fs/fifo.c
@@ -145,6 +145,6 @@ err_nocleanup:
  * is contain the open that then fills in the correct operations
  * depending on the access mode of the file...
  */
-struct file_operations def_fifo_fops = {
+const struct file_operations def_fifo_fops = {
         .open           = fifo_open,    /* will set read or write pipe_fops */
 };
diff --git a/fs/file.c b/fs/file.c
index bbc743314730..55f4e7022563 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -373,6 +373,6 @@ static void __devinit fdtable_defer_list_init(int cpu)
 void __init files_defer_init(void)
 {
         int i;
-        for_each_cpu(i)
+        for_each_possible_cpu(i)
                 fdtable_defer_list_init(i);
 }
diff --git a/fs/freevxfs/vxfs_extern.h b/fs/freevxfs/vxfs_extern.h
index 927acf70c591..1cf1fe8466a2 100644
--- a/fs/freevxfs/vxfs_extern.h
+++ b/fs/freevxfs/vxfs_extern.h
@@ -63,7 +63,7 @@ extern void			vxfs_clear_inode(struct inode *);
 
 /* vxfs_lookup.c */
 extern struct inode_operations  vxfs_dir_inode_ops;
-extern struct file_operations   vxfs_dir_operations;
+extern const struct file_operations     vxfs_dir_operations;
 
 /* vxfs_olt.c */
 extern int                      vxfs_read_olt(struct super_block *, u_long);
diff --git a/fs/freevxfs/vxfs_lookup.c b/fs/freevxfs/vxfs_lookup.c
index 554eb455722c..29cce456c7ce 100644
--- a/fs/freevxfs/vxfs_lookup.c
+++ b/fs/freevxfs/vxfs_lookup.c
@@ -56,7 +56,7 @@ struct inode_operations vxfs_dir_inode_ops = {
         .lookup =               vxfs_lookup,
 };
 
-struct file_operations vxfs_dir_operations = {
+const struct file_operations vxfs_dir_operations = {
         .readdir =              vxfs_readdir,
 };
 
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 0c9a2ee54c91..23d1f52eb1b8 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -922,7 +922,7 @@ static int fuse_dev_release(struct inode *inode, struct file *file)
         return 0;
 }
 
-struct file_operations fuse_dev_operations = {
+const struct file_operations fuse_dev_operations = {
         .owner          = THIS_MODULE,
         .llseek         = no_llseek,
         .read           = fuse_dev_read,
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index c72a8a97935c..256355b80256 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -1170,7 +1170,7 @@ static struct inode_operations fuse_dir_inode_operations = {
         .removexattr    = fuse_removexattr,
 };
 
-static struct file_operations fuse_dir_operations = {
+static const struct file_operations fuse_dir_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_read_dir,
         .readdir        = fuse_readdir,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 6f05379b0a0d..975f2697e866 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -12,7 +12,7 @@
 #include <linux/slab.h>
 #include <linux/kernel.h>
 
-static struct file_operations fuse_direct_io_file_operations;
+static const struct file_operations fuse_direct_io_file_operations;
 
 static int fuse_send_open(struct inode *inode, struct file *file, int isdir,
                           struct fuse_open_out *outargp)
@@ -611,7 +611,7 @@ static int fuse_set_page_dirty(struct page *page)
         return 0;
 }
 
-static struct file_operations fuse_file_operations = {
+static const struct file_operations fuse_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
@@ -623,7 +623,7 @@ static struct file_operations fuse_file_operations = {
         .sendfile       = generic_file_sendfile,
 };
 
-static struct file_operations fuse_direct_io_file_operations = {
+static const struct file_operations fuse_direct_io_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = fuse_direct_read,
         .write          = fuse_direct_write,
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 4a83adfec968..a16a04fcf41e 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -346,7 +346,7 @@ static inline u64 get_node_id(struct inode *inode)
 }
 
 /** Device operations */
-extern struct file_operations fuse_dev_operations;
+extern const struct file_operations fuse_dev_operations;
 
 /**
  * This is the single global spinlock which protects FUSE's structures
diff --git a/fs/hfs/dir.c b/fs/hfs/dir.c
index 534e5a7480ef..7cd8cc03aea7 100644
--- a/fs/hfs/dir.c
+++ b/fs/hfs/dir.c
@@ -313,7 +313,7 @@ static int hfs_rename(struct inode *old_dir, struct dentry *old_dentry,
         return res;
 }
 
-struct file_operations hfs_dir_operations = {
+const struct file_operations hfs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = hfs_readdir,
         .llseek         = generic_file_llseek,
diff --git a/fs/hfs/hfs_fs.h b/fs/hfs/hfs_fs.h
index 18ce47ab1b71..3ed8663a8db1 100644
--- a/fs/hfs/hfs_fs.h
+++ b/fs/hfs/hfs_fs.h
@@ -169,7 +169,7 @@ extern int hfs_cat_move(u32, struct inode *, struct qstr *,
 extern void hfs_cat_build_key(struct super_block *, btree_key *, u32, struct qstr *);
 
 /* dir.c */
-extern struct file_operations hfs_dir_operations;
+extern const struct file_operations hfs_dir_operations;
 extern struct inode_operations hfs_dir_inode_operations;
 
 /* extent.c */
diff --git a/fs/hfs/inode.c b/fs/hfs/inode.c
index 2c564701724f..2d4ced22201b 100644
--- a/fs/hfs/inode.c
+++ b/fs/hfs/inode.c
@@ -17,7 +17,7 @@
 #include "hfs_fs.h"
 #include "btree.h"
 
-static struct file_operations hfs_file_operations;
+static const struct file_operations hfs_file_operations;
 static struct inode_operations hfs_file_inode_operations;
 
 /*================ Variable-like macros ================*/
@@ -601,7 +601,7 @@ int hfs_inode_setattr(struct dentry *dentry, struct iattr * attr)
 }
 
 
-static struct file_operations hfs_file_operations = {
+static const struct file_operations hfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/hfsplus/dir.c b/fs/hfsplus/dir.c
index 01a6fe3a395c..1f9ece0de326 100644
--- a/fs/hfsplus/dir.c
+++ b/fs/hfsplus/dir.c
@@ -483,7 +483,7 @@ struct inode_operations hfsplus_dir_inode_operations = {
         .rename         = hfsplus_rename,
 };
 
-struct file_operations hfsplus_dir_operations = {
+const struct file_operations hfsplus_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = hfsplus_readdir,
         .ioctl          = hfsplus_ioctl,
diff --git a/fs/hfsplus/inode.c b/fs/hfsplus/inode.c
index 9fbe4d2aeece..acf66dba3e01 100644
--- a/fs/hfsplus/inode.c
+++ b/fs/hfsplus/inode.c
@@ -280,7 +280,7 @@ static struct inode_operations hfsplus_file_inode_operations = {
         .listxattr      = hfsplus_listxattr,
 };
 
-static struct file_operations hfsplus_file_operations = {
+static const struct file_operations hfsplus_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/hostfs/hostfs_kern.c b/fs/hostfs/hostfs_kern.c
index b3ad0bd0312f..bf0f8e16e433 100644
--- a/fs/hostfs/hostfs_kern.c
+++ b/fs/hostfs/hostfs_kern.c
@@ -384,7 +384,7 @@ int hostfs_fsync(struct file *file, struct dentry *dentry, int datasync)
         return fsync_file(HOSTFS_I(dentry->d_inode)->fd, datasync);
 }
 
-static struct file_operations hostfs_file_fops = {
+static const struct file_operations hostfs_file_fops = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .sendfile       = generic_file_sendfile,
@@ -399,7 +399,7 @@ static struct file_operations hostfs_file_fops = {
         .fsync          = hostfs_fsync,
 };
 
-static struct file_operations hostfs_dir_fops = {
+static const struct file_operations hostfs_dir_fops = {
         .llseek         = generic_file_llseek,
         .readdir        = hostfs_readdir,
         .read           = generic_read_dir,
diff --git a/fs/hostfs/hostfs_user.c b/fs/hostfs/hostfs_user.c
index b97809deba66..23b7cee72123 100644
--- a/fs/hostfs/hostfs_user.c
+++ b/fs/hostfs/hostfs_user.c
@@ -360,7 +360,6 @@ int do_statfs(char *root, long *bsize_out, long long *blocks_out,
         spare_out[2] = buf.f_spare[2];
         spare_out[3] = buf.f_spare[3];
         spare_out[4] = buf.f_spare[4];
-        spare_out[5] = buf.f_spare[5];
         return(0);
 }
 
diff --git a/fs/hpfs/dir.c b/fs/hpfs/dir.c
index 5591f9623aa2..ecc9180645ae 100644
--- a/fs/hpfs/dir.c
+++ b/fs/hpfs/dir.c
@@ -310,7 +310,7 @@ struct dentry *hpfs_lookup(struct inode *dir, struct dentry *dentry, struct name
         return ERR_PTR(-ENOENT);
 }
 
-struct file_operations hpfs_dir_ops =
+const struct file_operations hpfs_dir_ops =
 {
         .llseek         = hpfs_dir_lseek,
         .read           = generic_read_dir,
diff --git a/fs/hpfs/file.c b/fs/hpfs/file.c
index 7c995ac4081b..d3b9fffe45a1 100644
--- a/fs/hpfs/file.c
+++ b/fs/hpfs/file.c
@@ -119,7 +119,7 @@ static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
         return retval;
 }
 
-struct file_operations hpfs_file_ops =
+const struct file_operations hpfs_file_ops =
 {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
diff --git a/fs/hpfs/hpfs_fn.h b/fs/hpfs/hpfs_fn.h
index 4c6473ab3b34..29b7a3e55173 100644
--- a/fs/hpfs/hpfs_fn.h
+++ b/fs/hpfs/hpfs_fn.h
@@ -240,7 +240,7 @@ void hpfs_set_dentry_operations(struct dentry *);
 /* dir.c */
 
 struct dentry *hpfs_lookup(struct inode *, struct dentry *, struct nameidata *);
-extern struct file_operations hpfs_dir_ops;
+extern const struct file_operations hpfs_dir_ops;
 
 /* dnode.c */
 
@@ -266,7 +266,7 @@ void hpfs_set_ea(struct inode *, struct fnode *, char *, char *, int);
 /* file.c */
 
 int hpfs_file_fsync(struct file *, struct dentry *, int);
-extern struct file_operations hpfs_file_ops;
+extern const struct file_operations hpfs_file_ops;
 extern struct inode_operations hpfs_file_iops;
 extern struct address_space_operations hpfs_aops;
 
diff --git a/fs/hppfs/hppfs_kern.c b/fs/hppfs/hppfs_kern.c
index a44dc5897399..2ba20cdb5baa 100644
--- a/fs/hppfs/hppfs_kern.c
+++ b/fs/hppfs/hppfs_kern.c
@@ -558,7 +558,7 @@ static loff_t hppfs_llseek(struct file *file, loff_t off, int where)
         return(default_llseek(file, off, where));
 }
 
-static struct file_operations hppfs_file_fops = {
+static const struct file_operations hppfs_file_fops = {
         .owner          = NULL,
         .llseek         = hppfs_llseek,
         .read           = hppfs_read,
@@ -609,7 +609,7 @@ static int hppfs_fsync(struct file *file, struct dentry *dentry, int datasync)
         return(0);
 }
 
-static struct file_operations hppfs_dir_fops = {
+static const struct file_operations hppfs_dir_fops = {
         .owner          = NULL,
         .readdir        = hppfs_readdir,
         .open           = hppfs_dir_open,
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 25fa8bba8cb5..3a5b4e923455 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -35,7 +35,7 @@
 
 static struct super_operations hugetlbfs_ops;
 static struct address_space_operations hugetlbfs_aops;
-struct file_operations hugetlbfs_file_operations;
+const struct file_operations hugetlbfs_file_operations;
 static struct inode_operations hugetlbfs_dir_inode_operations;
 static struct inode_operations hugetlbfs_inode_operations;
 
@@ -566,7 +566,7 @@ static void init_once(void *foo, kmem_cache_t *cachep, unsigned long flags)
                 inode_init_once(&ei->vfs_inode);
 }
 
-struct file_operations hugetlbfs_file_operations = {
+const struct file_operations hugetlbfs_file_operations = {
         .mmap                   = hugetlbfs_file_mmap,
         .fsync                  = simple_sync_file,
         .get_unmapped_area      = hugetlb_get_unmapped_area,
diff --git a/fs/inode.c b/fs/inode.c
index 1fddf2803af8..32b7c3375021 100644
--- a/fs/inode.c
+++ b/fs/inode.c
@@ -104,7 +104,7 @@ static struct inode *alloc_inode(struct super_block *sb)
 {
         static struct address_space_operations empty_aops;
         static struct inode_operations empty_iops;
-        static struct file_operations empty_fops;
+        static const struct file_operations empty_fops;
         struct inode *inode;
 
         if (sb->s_op->alloc_inode)
diff --git a/fs/inotify.c b/fs/inotify.c
index f48a3dae0712..367c487c014b 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -920,7 +920,7 @@ static long inotify_ioctl(struct file *file, unsigned int cmd,
         return ret;
 }
 
-static struct file_operations inotify_fops = {
+static const struct file_operations inotify_fops = {
         .poll           = inotify_poll,
         .read           = inotify_read,
         .release        = inotify_release,
diff --git a/fs/isofs/dir.c b/fs/isofs/dir.c
index 7901ac9f97ab..5440ea292c69 100644
--- a/fs/isofs/dir.c
+++ b/fs/isofs/dir.c
@@ -16,7 +16,7 @@
 
 static int isofs_readdir(struct file *, void *, filldir_t);
 
-struct file_operations isofs_dir_operations =
+const struct file_operations isofs_dir_operations =
 {
         .read           = generic_read_dir,
         .readdir        = isofs_readdir,
diff --git a/fs/isofs/isofs.h b/fs/isofs/isofs.h
index 439a19b1bf3e..b87ba066f5e7 100644
--- a/fs/isofs/isofs.h
+++ b/fs/isofs/isofs.h
@@ -175,6 +175,6 @@ isofs_normalize_block_and_offset(struct iso_directory_record* de,
 }
 
 extern struct inode_operations isofs_dir_inode_operations;
-extern struct file_operations isofs_dir_operations;
+extern const struct file_operations isofs_dir_operations;
 extern struct address_space_operations isofs_symlink_aops;
 extern struct export_operations isofs_export_ops;
diff --git a/fs/jffs/inode-v23.c b/fs/jffs/inode-v23.c
index 5a4519e834da..020cc097c539 100644
--- a/fs/jffs/inode-v23.c
+++ b/fs/jffs/inode-v23.c
@@ -55,9 +55,9 @@
 static int jffs_remove(struct inode *dir, struct dentry *dentry, int type);
 
 static struct super_operations jffs_ops;
-static struct file_operations jffs_file_operations;
+static const struct file_operations jffs_file_operations;
 static struct inode_operations jffs_file_inode_operations;
-static struct file_operations jffs_dir_operations;
+static const struct file_operations jffs_dir_operations;
 static struct inode_operations jffs_dir_inode_operations;
 static struct address_space_operations jffs_address_operations;
 
@@ -1629,7 +1629,7 @@ static int jffs_fsync(struct file *f, struct dentry *d, int datasync)
 }
 
 
-static struct file_operations jffs_file_operations =
+static const struct file_operations jffs_file_operations =
 {
         .open           = generic_file_open,
         .llseek         = generic_file_llseek,
@@ -1649,7 +1649,7 @@ static struct inode_operations jffs_file_inode_operations =
 };
 
 
-static struct file_operations jffs_dir_operations =
+static const struct file_operations jffs_dir_operations =
 {
         .readdir        = jffs_readdir,
 };
diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c
index a7bf9cb2567f..8bc7a5018e40 100644
--- a/fs/jffs2/dir.c
+++ b/fs/jffs2/dir.c
@@ -37,7 +37,7 @@ static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
 static int jffs2_rename (struct inode *, struct dentry *,
                         struct inode *, struct dentry *);
 
-struct file_operations jffs2_dir_operations =
+const struct file_operations jffs2_dir_operations =
 {
         .read =         generic_read_dir,
         .readdir =      jffs2_readdir,
diff --git a/fs/jffs2/file.c b/fs/jffs2/file.c
index 935f273dc57b..9f4171213e58 100644
--- a/fs/jffs2/file.c
+++ b/fs/jffs2/file.c
@@ -38,7 +38,7 @@ int jffs2_fsync(struct file *filp, struct dentry *dentry, int datasync)
         return 0;
 }
 
-struct file_operations jffs2_file_operations =
+const struct file_operations jffs2_file_operations =
 {
         .llseek =       generic_file_llseek,
         .open =         generic_file_open,
diff --git a/fs/jffs2/os-linux.h b/fs/jffs2/os-linux.h
index 59e7a393200c..d307cf548625 100644
--- a/fs/jffs2/os-linux.h
+++ b/fs/jffs2/os-linux.h
@@ -159,11 +159,11 @@ void jffs2_stop_garbage_collect_thread(struct jffs2_sb_info *c);
 void jffs2_garbage_collect_trigger(struct jffs2_sb_info *c);
 
 /* dir.c */
-extern struct file_operations jffs2_dir_operations;
+extern const struct file_operations jffs2_dir_operations;
 extern struct inode_operations jffs2_dir_inode_operations;
 
 /* file.c */
-extern struct file_operations jffs2_file_operations;
+extern const struct file_operations jffs2_file_operations;
 extern struct inode_operations jffs2_file_inode_operations;
 extern struct address_space_operations jffs2_file_address_operations;
 int jffs2_fsync(struct file *, struct dentry *, int);
diff --git a/fs/jfs/file.c b/fs/jfs/file.c
index e1ac6e497e2b..1c9745be5ada 100644
--- a/fs/jfs/file.c
+++ b/fs/jfs/file.c
@@ -100,7 +100,7 @@ struct inode_operations jfs_file_inode_operations = {
 #endif
 };
 
-struct file_operations jfs_file_operations = {
+const struct file_operations jfs_file_operations = {
         .open           = jfs_open,
         .llseek         = generic_file_llseek,
         .write          = generic_file_write,
diff --git a/fs/jfs/jfs_inode.h b/fs/jfs/jfs_inode.h
index 095d471b9f9a..c30072674464 100644
--- a/fs/jfs/jfs_inode.h
+++ b/fs/jfs/jfs_inode.h
@@ -35,9 +35,9 @@ extern void jfs_set_inode_flags(struct inode *);
 
 extern struct address_space_operations jfs_aops;
 extern struct inode_operations jfs_dir_inode_operations;
-extern struct file_operations jfs_dir_operations;
+extern const struct file_operations jfs_dir_operations;
 extern struct inode_operations jfs_file_inode_operations;
-extern struct file_operations jfs_file_operations;
+extern const struct file_operations jfs_file_operations;
 extern struct inode_operations jfs_symlink_inode_operations;
 extern struct dentry_operations jfs_ci_dentry_operations;
 #endif                          /* _H_JFS_INODE */
diff --git a/fs/jfs/namei.c b/fs/jfs/namei.c
index 309cee575f7d..09ea03f62277 100644
--- a/fs/jfs/namei.c
+++ b/fs/jfs/namei.c
@@ -1519,7 +1519,7 @@ struct inode_operations jfs_dir_inode_operations = {
 #endif
 };
 
-struct file_operations jfs_dir_operations = {
+const struct file_operations jfs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = jfs_readdir,
         .fsync          = jfs_fsync,
diff --git a/fs/libfs.c b/fs/libfs.c
index 4fdeaceb892c..7145ba7a48d0 100644
--- a/fs/libfs.c
+++ b/fs/libfs.c
@@ -179,7 +179,7 @@ ssize_t generic_read_dir(struct file *filp, char __user *buf, size_t siz, loff_t
         return -EISDIR;
 }
 
-struct file_operations simple_dir_operations = {
+const struct file_operations simple_dir_operations = {
         .open           = dcache_dir_open,
         .release        = dcache_dir_close,
         .llseek         = dcache_dir_lseek,
diff --git a/fs/mbcache.c b/fs/mbcache.c
index 73e754fea2d8..e4fde1ab22cd 100644
--- a/fs/mbcache.c
+++ b/fs/mbcache.c
@@ -311,7 +311,7 @@ fail:
 /*
  * mb_cache_shrink()
  *
- * Removes all cache entires of a device from the cache. All cache entries
+ * Removes all cache entries of a device from the cache. All cache entries
  * currently in use cannot be freed, and thus remain in the cache. All others
  * are freed.
  *
diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index 732502aabc05..69224d1fe043 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -14,7 +14,7 @@ typedef struct minix_dir_entry minix_dirent;
 
 static int minix_readdir(struct file *, void *, filldir_t);
 
-struct file_operations minix_dir_operations = {
+const struct file_operations minix_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = minix_readdir,
         .fsync          = minix_sync_file,
diff --git a/fs/minix/file.c b/fs/minix/file.c
index f1d77acb3f01..420b32882a10 100644
--- a/fs/minix/file.c
+++ b/fs/minix/file.c
@@ -15,7 +15,7 @@
  */
 int minix_sync_file(struct file *, struct dentry *, int);
 
-struct file_operations minix_file_operations = {
+const struct file_operations minix_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/minix/minix.h b/fs/minix/minix.h
index e42a8bb89001..c55b77cdcc8e 100644
--- a/fs/minix/minix.h
+++ b/fs/minix/minix.h
@@ -81,8 +81,8 @@ extern int minix_sync_file(struct file *, struct dentry *, int);
 
 extern struct inode_operations minix_file_inode_operations;
 extern struct inode_operations minix_dir_inode_operations;
-extern struct file_operations minix_file_operations;
-extern struct file_operations minix_dir_operations;
+extern const struct file_operations minix_file_operations;
+extern const struct file_operations minix_dir_operations;
 extern struct dentry_operations minix_dentry_operations;
 
 static inline struct minix_sb_info *minix_sb(struct super_block *sb)
diff --git a/fs/namei.c b/fs/namei.c
index 98dc2e134362..22f6e8d16aa8 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -546,6 +546,22 @@ struct path {
         struct dentry *dentry;
 };
 
+static inline void dput_path(struct path *path, struct nameidata *nd)
+{
+        dput(path->dentry);
+        if (path->mnt != nd->mnt)
+                mntput(path->mnt);
+}
+
+static inline void path_to_nameidata(struct path *path, struct nameidata *nd)
+{
+        dput(nd->dentry);
+        if (nd->mnt != path->mnt)
+                mntput(nd->mnt);
+        nd->mnt = path->mnt;
+        nd->dentry = path->dentry;
+}
+
 static __always_inline int __do_follow_link(struct path *path, struct nameidata *nd)
 {
         int error;
@@ -555,8 +571,11 @@ static __always_inline int __do_follow_link(struct path *path, struct nameidata
         touch_atime(path->mnt, dentry);
         nd_set_link(nd, NULL);
 
-        if (path->mnt == nd->mnt)
-                mntget(path->mnt);
+        if (path->mnt != nd->mnt) {
+                path_to_nameidata(path, nd);
+                dget(dentry);
+        }
+        mntget(path->mnt);
         cookie = dentry->d_inode->i_op->follow_link(dentry, nd);
         error = PTR_ERR(cookie);
         if (!IS_ERR(cookie)) {
@@ -573,22 +592,6 @@ static __always_inline int __do_follow_link(struct path *path, struct nameidata
         return error;
 }
 
-static inline void dput_path(struct path *path, struct nameidata *nd)
-{
-        dput(path->dentry);
-        if (path->mnt != nd->mnt)
-                mntput(path->mnt);
-}
-
-static inline void path_to_nameidata(struct path *path, struct nameidata *nd)
-{
-        dput(nd->dentry);
-        if (nd->mnt != path->mnt)
-                mntput(nd->mnt);
-        nd->mnt = path->mnt;
-        nd->dentry = path->dentry;
-}
-
 /*
  * This limits recursive symlink follows to 8, while
  * limiting consecutive symlinks to 40.
diff --git a/fs/namespace.c b/fs/namespace.c
index e069a4c5e389..bf478addb852 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -459,9 +459,9 @@ int may_umount_tree(struct vfsmount *mnt)
         spin_unlock(&vfsmount_lock);
 
         if (actual_refs > minimum_refs)
-                return -EBUSY;
+                return 0;
 
-        return 0;
+        return 1;
 }
 
 EXPORT_SYMBOL(may_umount_tree);
@@ -481,10 +481,10 @@ EXPORT_SYMBOL(may_umount_tree);
  */
 int may_umount(struct vfsmount *mnt)
 {
-        int ret = 0;
+        int ret = 1;
         spin_lock(&vfsmount_lock);
         if (propagate_mount_busy(mnt, 2))
-                ret = -EBUSY;
+                ret = 0;
         spin_unlock(&vfsmount_lock);
         return ret;
 }
diff --git a/fs/ncpfs/dir.c b/fs/ncpfs/dir.c
index cfd76f431dc0..f0860c602d8b 100644
--- a/fs/ncpfs/dir.c
+++ b/fs/ncpfs/dir.c
@@ -49,7 +49,7 @@ extern int ncp_symlink(struct inode *, struct dentry *, const char *);
 #define ncp_symlink NULL
 #endif
                       
-struct file_operations ncp_dir_operations =
+const struct file_operations ncp_dir_operations =
 {
         .read           = generic_read_dir,
         .readdir        = ncp_readdir,
diff --git a/fs/ncpfs/file.c b/fs/ncpfs/file.c
index ebdad8f6398f..e6b7c67cf057 100644
--- a/fs/ncpfs/file.c
+++ b/fs/ncpfs/file.c
@@ -283,7 +283,7 @@ static int ncp_release(struct inode *inode, struct file *file) {
         return 0;
 }
 
-struct file_operations ncp_file_operations =
+const struct file_operations ncp_file_operations =
 {
         .llseek         = remote_llseek,
         .read           = ncp_file_read,
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 06c48b385c94..a23f34894167 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -54,7 +54,7 @@ static int nfs_rename(struct inode *, struct dentry *,
 static int nfs_fsync_dir(struct file *, struct dentry *, int);
 static loff_t nfs_llseek_dir(struct file *, loff_t, int);
 
-struct file_operations nfs_dir_operations = {
+const struct file_operations nfs_dir_operations = {
         .llseek         = nfs_llseek_dir,
         .read           = generic_read_dir,
         .readdir        = nfs_readdir,
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index dee49a0cb995..f1df2c8d9259 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -49,7 +49,7 @@ static int nfs_check_flags(int flags);
 static int nfs_lock(struct file *filp, int cmd, struct file_lock *fl);
 static int nfs_flock(struct file *filp, int cmd, struct file_lock *fl);
 
-struct file_operations nfs_file_operations = {
+const struct file_operations nfs_file_operations = {
         .llseek         = nfs_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
diff --git a/fs/nfsd/export.c b/fs/nfsd/export.c
index 417ec02df44f..c340be0a3f59 100644
--- a/fs/nfsd/export.c
+++ b/fs/nfsd/export.c
@@ -57,27 +57,17 @@ static int		exp_verify_string(char *cp, int max);
 #define EXPKEY_HASHMASK         (EXPKEY_HASHMAX -1)
 static struct cache_head *expkey_table[EXPKEY_HASHMAX];
 
-static inline int svc_expkey_hash(struct svc_expkey *item)
+static void expkey_put(struct kref *ref)
 {
-        int hash = item->ek_fsidtype;
-        char * cp = (char*)item->ek_fsid;
-        int len = key_len(item->ek_fsidtype);
+        struct svc_expkey *key = container_of(ref, struct svc_expkey, h.ref);
 
-        hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
-        hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
-        return hash & EXPKEY_HASHMASK;
-}
-
-void expkey_put(struct cache_head *item, struct cache_detail *cd)
-{
-        if (cache_put(item, cd)) {
-                struct svc_expkey *key = container_of(item, struct svc_expkey, h);
-                if (test_bit(CACHE_VALID, &item->flags) &&
-                    !test_bit(CACHE_NEGATIVE, &item->flags))
-                        exp_put(key->ek_export);
-                auth_domain_put(key->ek_client);
-                kfree(key);
+        if (test_bit(CACHE_VALID, &key->h.flags) &&
+            !test_bit(CACHE_NEGATIVE, &key->h.flags)) {
+                dput(key->ek_dentry);
+                mntput(key->ek_mnt);
         }
+        auth_domain_put(key->ek_client);
+        kfree(key);
 }
 
 static void expkey_request(struct cache_detail *cd,
@@ -95,7 +85,10 @@ static void expkey_request(struct cache_detail *cd,
         (*bpp)[-1] = '\n';
 }
 
-static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *, int);
+static struct svc_expkey *svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old);
+static struct svc_expkey *svc_expkey_lookup(struct svc_expkey *);
+static struct cache_detail svc_expkey_cache;
+
 static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
 {
         /* client fsidtype fsid [path] */
@@ -106,6 +99,7 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
         int fsidtype;
         char *ep;
         struct svc_expkey key;
+        struct svc_expkey *ek;
 
         if (mesg[mlen-1] != '\n')
                 return -EINVAL;
@@ -150,40 +144,38 @@ static int expkey_parse(struct cache_detail *cd, char *mesg, int mlen)
         key.ek_fsidtype = fsidtype;
         memcpy(key.ek_fsid, buf, len);
 
+        ek = svc_expkey_lookup(&key);
+        err = -ENOMEM;
+        if (!ek)
+                goto out;
+
         /* now we want a pathname, or empty meaning NEGATIVE  */
+        err = -EINVAL;
         if ((len=qword_get(&mesg, buf, PAGE_SIZE)) < 0)
                 goto out;
         dprintk("Path seems to be <%s>\n", buf);
         err = 0;
         if (len == 0) {
-                struct svc_expkey *ek;
                 set_bit(CACHE_NEGATIVE, &key.h.flags);
-                ek = svc_expkey_lookup(&key, 1);
+                ek = svc_expkey_update(&key, ek);
                 if (ek)
-                        expkey_put(&ek->h, &svc_expkey_cache);
+                        cache_put(&ek->h, &svc_expkey_cache);
+                else err = -ENOMEM;
         } else {
                 struct nameidata nd;
-                struct svc_expkey *ek;
-                struct svc_export *exp;
                 err = path_lookup(buf, 0, &nd);
                 if (err)
                         goto out;
 
                 dprintk("Found the path %s\n", buf);
-                exp = exp_get_by_name(dom, nd.mnt, nd.dentry, NULL);
-
-                err = -ENOENT;
-                if (!exp)
-                        goto out_nd;
-                key.ek_export = exp;
-                dprintk("And found export\n");
+                key.ek_mnt = nd.mnt;
+                key.ek_dentry = nd.dentry;
                 
-                ek = svc_expkey_lookup(&key, 1);
+                ek = svc_expkey_update(&key, ek);
                 if (ek)
-                        expkey_put(&ek->h, &svc_expkey_cache);
-                exp_put(exp);
-                err = 0;
-        out_nd:
+                        cache_put(&ek->h, &svc_expkey_cache);
+                else
+                        err = -ENOMEM;
                 path_release(&nd);
         }
         cache_flush();
@@ -214,35 +206,31 @@ static int expkey_show(struct seq_file *m,
         if (test_bit(CACHE_VALID, &h->flags) && 
             !test_bit(CACHE_NEGATIVE, &h->flags)) {
                 seq_printf(m, " ");
-                seq_path(m, ek->ek_export->ex_mnt, ek->ek_export->ex_dentry, "\\ \t\n");
+                seq_path(m, ek->ek_mnt, ek->ek_dentry, "\\ \t\n");
         }
         seq_printf(m, "\n");
         return 0;
 }
-        
-struct cache_detail svc_expkey_cache = {
-        .owner          = THIS_MODULE,
-        .hash_size      = EXPKEY_HASHMAX,
-        .hash_table     = expkey_table,
-        .name           = "nfsd.fh",
-        .cache_put      = expkey_put,
-        .cache_request  = expkey_request,
-        .cache_parse    = expkey_parse,
-        .cache_show     = expkey_show,
-};
 
-static inline int svc_expkey_match (struct svc_expkey *a, struct svc_expkey *b)
+static inline int expkey_match (struct cache_head *a, struct cache_head *b)
 {
-        if (a->ek_fsidtype != b->ek_fsidtype ||
-            a->ek_client != b->ek_client ||
-            memcmp(a->ek_fsid, b->ek_fsid, key_len(a->ek_fsidtype)) != 0)
+        struct svc_expkey *orig = container_of(a, struct svc_expkey, h);
+        struct svc_expkey *new = container_of(b, struct svc_expkey, h);
+
+        if (orig->ek_fsidtype != new->ek_fsidtype ||
+            orig->ek_client != new->ek_client ||
+            memcmp(orig->ek_fsid, new->ek_fsid, key_len(orig->ek_fsidtype)) != 0)
                 return 0;
         return 1;
 }
 
-static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *item)
+static inline void expkey_init(struct cache_head *cnew,
+                                   struct cache_head *citem)
 {
-        cache_get(&item->ek_client->h);
+        struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
+        struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
+
+        kref_get(&item->ek_client->ref);
         new->ek_client = item->ek_client;
         new->ek_fsidtype = item->ek_fsidtype;
         new->ek_fsid[0] = item->ek_fsid[0];
@@ -250,39 +238,94 @@ static inline void svc_expkey_init(struct svc_expkey *new, struct svc_expkey *it
         new->ek_fsid[2] = item->ek_fsid[2];
 }
 
-static inline void svc_expkey_update(struct svc_expkey *new, struct svc_expkey *item)
+static inline void expkey_update(struct cache_head *cnew,
+                                   struct cache_head *citem)
+{
+        struct svc_expkey *new = container_of(cnew, struct svc_expkey, h);
+        struct svc_expkey *item = container_of(citem, struct svc_expkey, h);
+
+        new->ek_mnt = mntget(item->ek_mnt);
+        new->ek_dentry = dget(item->ek_dentry);
+}
+
+static struct cache_head *expkey_alloc(void)
 {
-        cache_get(&item->ek_export->h);
-        new->ek_export = item->ek_export;
+        struct svc_expkey *i = kmalloc(sizeof(*i), GFP_KERNEL);
+        if (i)
+                return &i->h;
+        else
+                return NULL;
 }
 
-static DefineSimpleCacheLookup(svc_expkey,0) /* no inplace updates */
+static struct cache_detail svc_expkey_cache = {
+        .owner          = THIS_MODULE,
+        .hash_size      = EXPKEY_HASHMAX,
+        .hash_table     = expkey_table,
+        .name           = "nfsd.fh",
+        .cache_put      = expkey_put,
+        .cache_request  = expkey_request,
+        .cache_parse    = expkey_parse,
+        .cache_show     = expkey_show,
+        .match          = expkey_match,
+        .init           = expkey_init,
+        .update         = expkey_update,
+        .alloc          = expkey_alloc,
+};
 
-#define EXPORT_HASHBITS         8
-#define EXPORT_HASHMAX          (1<< EXPORT_HASHBITS)
-#define EXPORT_HASHMASK         (EXPORT_HASHMAX -1)
+static struct svc_expkey *
+svc_expkey_lookup(struct svc_expkey *item)
+{
+        struct cache_head *ch;
+        int hash = item->ek_fsidtype;
+        char * cp = (char*)item->ek_fsid;
+        int len = key_len(item->ek_fsidtype);
 
-static struct cache_head *export_table[EXPORT_HASHMAX];
+        hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
+        hash ^= hash_ptr(item->ek_client, EXPKEY_HASHBITS);
+        hash &= EXPKEY_HASHMASK;
 
-static inline int svc_export_hash(struct svc_export *item)
+        ch = sunrpc_cache_lookup(&svc_expkey_cache, &item->h,
+                                 hash);
+        if (ch)
+                return container_of(ch, struct svc_expkey, h);
+        else
+                return NULL;
+}
+
+static struct svc_expkey *
+svc_expkey_update(struct svc_expkey *new, struct svc_expkey *old)
 {
-        int rv;
+        struct cache_head *ch;
+        int hash = new->ek_fsidtype;
+        char * cp = (char*)new->ek_fsid;
+        int len = key_len(new->ek_fsidtype);
 
-        rv = hash_ptr(item->ex_client, EXPORT_HASHBITS);
-        rv ^= hash_ptr(item->ex_dentry, EXPORT_HASHBITS);
-        rv ^= hash_ptr(item->ex_mnt, EXPORT_HASHBITS);
-        return rv;
+        hash ^= hash_mem(cp, len, EXPKEY_HASHBITS);
+        hash ^= hash_ptr(new->ek_client, EXPKEY_HASHBITS);
+        hash &= EXPKEY_HASHMASK;
+
+        ch = sunrpc_cache_update(&svc_expkey_cache, &new->h,
+                                 &old->h, hash);
+        if (ch)
+                return container_of(ch, struct svc_expkey, h);
+        else
+                return NULL;
 }
 
-void svc_export_put(struct cache_head *item, struct cache_detail *cd)
+
+#define EXPORT_HASHBITS         8
+#define EXPORT_HASHMAX          (1<< EXPORT_HASHBITS)
+#define EXPORT_HASHMASK         (EXPORT_HASHMAX -1)
+
+static struct cache_head *export_table[EXPORT_HASHMAX];
+
+static void svc_export_put(struct kref *ref)
 {
-        if (cache_put(item, cd)) {
-                struct svc_export *exp = container_of(item, struct svc_export, h);
-                dput(exp->ex_dentry);
-                mntput(exp->ex_mnt);
-                auth_domain_put(exp->ex_client);
-                kfree(exp);
-        }
+        struct svc_export *exp = container_of(ref, struct svc_export, h.ref);
+        dput(exp->ex_dentry);
+        mntput(exp->ex_mnt);
+        auth_domain_put(exp->ex_client);
+        kfree(exp);
 }
 
 static void svc_export_request(struct cache_detail *cd,
@@ -304,7 +347,9 @@ static void svc_export_request(struct cache_detail *cd,
         (*bpp)[-1] = '\n';
 }
 
-static struct svc_export *svc_export_lookup(struct svc_export *, int);
+static struct svc_export *svc_export_update(struct svc_export *new,
+                                            struct svc_export *old);
+static struct svc_export *svc_export_lookup(struct svc_export *);
 
 static int check_export(struct inode *inode, int flags)
 {
@@ -417,11 +462,16 @@ static int svc_export_parse(struct cache_detail *cd, char *mesg, int mlen)
                 if (err) goto out;
         }
 
-        expp = svc_export_lookup(&exp, 1);
+        expp = svc_export_lookup(&exp);
         if (expp)
-                exp_put(expp);
-        err = 0;
+                expp = svc_export_update(&exp, expp);
+        else
+                err = -ENOMEM;
         cache_flush();
+        if (expp == NULL)
+                err = -ENOMEM;
+        else
+                exp_put(expp);
  out:
         if (nd.dentry)
                 path_release(&nd);
@@ -455,6 +505,46 @@ static int svc_export_show(struct seq_file *m,
         seq_puts(m, ")\n");
         return 0;
 }
+static int svc_export_match(struct cache_head *a, struct cache_head *b)
+{
+        struct svc_export *orig = container_of(a, struct svc_export, h);
+        struct svc_export *new = container_of(b, struct svc_export, h);
+        return orig->ex_client == new->ex_client &&
+                orig->ex_dentry == new->ex_dentry &&
+                orig->ex_mnt == new->ex_mnt;
+}
+
+static void svc_export_init(struct cache_head *cnew, struct cache_head *citem)
+{
+        struct svc_export *new = container_of(cnew, struct svc_export, h);
+        struct svc_export *item = container_of(citem, struct svc_export, h);
+
+        kref_get(&item->ex_client->ref);
+        new->ex_client = item->ex_client;
+        new->ex_dentry = dget(item->ex_dentry);
+        new->ex_mnt = mntget(item->ex_mnt);
+}
+
+static void export_update(struct cache_head *cnew, struct cache_head *citem)
+{
+        struct svc_export *new = container_of(cnew, struct svc_export, h);
+        struct svc_export *item = container_of(citem, struct svc_export, h);
+
+        new->ex_flags = item->ex_flags;
+        new->ex_anon_uid = item->ex_anon_uid;
+        new->ex_anon_gid = item->ex_anon_gid;
+        new->ex_fsid = item->ex_fsid;
+}
+
+static struct cache_head *svc_export_alloc(void)
+{
+        struct svc_export *i = kmalloc(sizeof(*i), GFP_KERNEL);
+        if (i)
+                return &i->h;
+        else
+                return NULL;
+}
+
 struct cache_detail svc_export_cache = {
         .owner          = THIS_MODULE,
         .hash_size      = EXPORT_HASHMAX,
@@ -464,34 +554,49 @@ struct cache_detail svc_export_cache = {
         .cache_request  = svc_export_request,
         .cache_parse    = svc_export_parse,
         .cache_show     = svc_export_show,
+        .match          = svc_export_match,
+        .init           = svc_export_init,
+        .update         = export_update,
+        .alloc          = svc_export_alloc,
 };
 
-static inline int svc_export_match(struct svc_export *a, struct svc_export *b)
+static struct svc_export *
+svc_export_lookup(struct svc_export *exp)
 {
-        return a->ex_client == b->ex_client &&
-                a->ex_dentry == b->ex_dentry &&
-                a->ex_mnt == b->ex_mnt;
-}
-static inline void svc_export_init(struct svc_export *new, struct svc_export *item)
-{
-        cache_get(&item->ex_client->h);
-        new->ex_client = item->ex_client;
-        new->ex_dentry = dget(item->ex_dentry);
-        new->ex_mnt = mntget(item->ex_mnt);
+        struct cache_head *ch;
+        int hash;
+        hash = hash_ptr(exp->ex_client, EXPORT_HASHBITS);
+        hash ^= hash_ptr(exp->ex_dentry, EXPORT_HASHBITS);
+        hash ^= hash_ptr(exp->ex_mnt, EXPORT_HASHBITS);
+
+        ch = sunrpc_cache_lookup(&svc_export_cache, &exp->h,
+                                 hash);
+        if (ch)
+                return container_of(ch, struct svc_export, h);
+        else
+                return NULL;
 }
 
-static inline void svc_export_update(struct svc_export *new, struct svc_export *item)
+static struct svc_export *
+svc_export_update(struct svc_export *new, struct svc_export *old)
 {
-        new->ex_flags = item->ex_flags;
-        new->ex_anon_uid = item->ex_anon_uid;
-        new->ex_anon_gid = item->ex_anon_gid;
-        new->ex_fsid = item->ex_fsid;
+        struct cache_head *ch;
+        int hash;
+        hash = hash_ptr(old->ex_client, EXPORT_HASHBITS);
+        hash ^= hash_ptr(old->ex_dentry, EXPORT_HASHBITS);
+        hash ^= hash_ptr(old->ex_mnt, EXPORT_HASHBITS);
+
+        ch = sunrpc_cache_update(&svc_export_cache, &new->h,
+                                 &old->h,
+                                 hash);
+        if (ch)
+                return container_of(ch, struct svc_export, h);
+        else
+                return NULL;
 }
 
-static DefineSimpleCacheLookup(svc_export,1) /* allow inplace updates */
 
-
-struct svc_expkey *
+static struct svc_expkey *
 exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
 {
         struct svc_expkey key, *ek;
@@ -504,7 +609,7 @@ exp_find_key(svc_client *clp, int fsid_type, u32 *fsidv, struct cache_req *reqp)
         key.ek_fsidtype = fsid_type;
         memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
 
-        ek = svc_expkey_lookup(&key, 0);
+        ek = svc_expkey_lookup(&key);
         if (ek != NULL)
                 if ((err = cache_check(&svc_expkey_cache, &ek->h, reqp)))
                         ek = ERR_PTR(err);
@@ -519,13 +624,16 @@ static int exp_set_key(svc_client *clp, int fsid_type, u32 *fsidv,
         key.ek_client = clp;
         key.ek_fsidtype = fsid_type;
         memcpy(key.ek_fsid, fsidv, key_len(fsid_type));
-        key.ek_export = exp;
+        key.ek_mnt = exp->ex_mnt;
+        key.ek_dentry = exp->ex_dentry;
         key.h.expiry_time = NEVER;
         key.h.flags = 0;
 
-        ek = svc_expkey_lookup(&key, 1);
+        ek = svc_expkey_lookup(&key);
+        if (ek)
+                ek = svc_expkey_update(&key,ek);
         if (ek) {
-                expkey_put(&ek->h, &svc_expkey_cache);
+                cache_put(&ek->h, &svc_expkey_cache);
                 return 0;
         }
         return -ENOMEM;
@@ -573,7 +681,7 @@ exp_get_by_name(svc_client *clp, struct vfsmount *mnt, struct dentry *dentry,
         key.ex_mnt = mnt;
         key.ex_dentry = dentry;
 
-        exp = svc_export_lookup(&key, 0);
+        exp = svc_export_lookup(&key);
         if (exp != NULL) 
                 switch (cache_check(&svc_export_cache, &exp->h, reqp)) {
                 case 0: break;
@@ -654,7 +762,7 @@ static void exp_fsid_unhash(struct svc_export *exp)
         ek = exp_get_fsid_key(exp->ex_client, exp->ex_fsid);
         if (ek && !IS_ERR(ek)) {
                 ek->h.expiry_time = get_seconds()-1;
-                expkey_put(&ek->h, &svc_expkey_cache);
+                cache_put(&ek->h, &svc_expkey_cache);
         }
         svc_expkey_cache.nextcheck = get_seconds();
 }
@@ -692,7 +800,7 @@ static void exp_unhash(struct svc_export *exp)
         ek = exp_get_key(exp->ex_client, inode->i_sb->s_dev, inode->i_ino);
         if (ek && !IS_ERR(ek)) {
                 ek->h.expiry_time = get_seconds()-1;
-                expkey_put(&ek->h, &svc_expkey_cache);
+                cache_put(&ek->h, &svc_expkey_cache);
         }
         svc_expkey_cache.nextcheck = get_seconds();
 }
@@ -741,8 +849,8 @@ exp_export(struct nfsctl_export *nxp)
         if ((nxp->ex_flags & NFSEXP_FSID) &&
             (fsid_key = exp_get_fsid_key(clp, nxp->ex_dev)) &&
             !IS_ERR(fsid_key) &&
-            fsid_key->ek_export &&
-            fsid_key->ek_export != exp)
+            fsid_key->ek_mnt &&
+            (fsid_key->ek_mnt != nd.mnt || fsid_key->ek_dentry != nd.dentry) )
                 goto finish;
 
         if (exp) {
@@ -775,13 +883,13 @@ exp_export(struct nfsctl_export *nxp)
         new.ex_anon_gid = nxp->ex_anon_gid;
         new.ex_fsid = nxp->ex_dev;
 
-        exp = svc_export_lookup(&new, 1);
+        exp = svc_export_lookup(&new);
+        if (exp)
+                exp = svc_export_update(&new, exp);
 
-        if (exp == NULL)
+        if (!exp)
                 goto finish;
 
-        err = 0;
-
         if (exp_hash(clp, exp) ||
             exp_fsid_hash(clp, exp)) {
                 /* failed to create at least one index */
@@ -794,7 +902,7 @@ finish:
         if (exp)
                 exp_put(exp);
         if (fsid_key && !IS_ERR(fsid_key))
-                expkey_put(&fsid_key->h, &svc_expkey_cache);
+                cache_put(&fsid_key->h, &svc_expkey_cache);
         if (clp)
                 auth_domain_put(clp);
         path_release(&nd);
@@ -912,6 +1020,24 @@ out:
         return err;
 }
 
+struct svc_export *
+exp_find(struct auth_domain *clp, int fsid_type, u32 *fsidv,
+         struct cache_req *reqp)
+{
+        struct svc_export *exp;
+        struct svc_expkey *ek = exp_find_key(clp, fsid_type, fsidv, reqp);
+        if (!ek || IS_ERR(ek))
+                return ERR_PTR(PTR_ERR(ek));
+
+        exp = exp_get_by_name(clp, ek->ek_mnt, ek->ek_dentry, reqp);
+        cache_put(&ek->h, &svc_expkey_cache);
+
+        if (!exp || IS_ERR(exp))
+                return ERR_PTR(PTR_ERR(exp));
+        return exp;
+}
+
+
 /*
  * Called when we need the filehandle for the root of the pseudofs,
  * for a given NFSv4 client.   The root is defined to be the
@@ -922,6 +1048,7 @@ exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
                struct cache_req *creq)
 {
         struct svc_expkey *fsid_key;
+        struct svc_export *exp;
         int rv;
         u32 fsidv[2];
 
@@ -933,9 +1060,15 @@ exp_pseudoroot(struct auth_domain *clp, struct svc_fh *fhp,
         if (!fsid_key || IS_ERR(fsid_key))
                 return nfserr_perm;
 
-        rv = fh_compose(fhp, fsid_key->ek_export, 
-                          fsid_key->ek_export->ex_dentry, NULL);
-        expkey_put(&fsid_key->h, &svc_expkey_cache);
+        exp = exp_get_by_name(clp, fsid_key->ek_mnt, fsid_key->ek_dentry, creq);
+        if (exp == NULL)
+                rv = nfserr_perm;
+        else if (IS_ERR(exp))
+                rv = nfserrno(PTR_ERR(exp));
+        else
+                rv = fh_compose(fhp, exp,
+                                fsid_key->ek_dentry, NULL);
+        cache_put(&fsid_key->h, &svc_expkey_cache);
         return rv;
 }
 
@@ -1054,7 +1187,7 @@ static int e_show(struct seq_file *m, void *p)
         cache_get(&exp->h);
         if (cache_check(&svc_export_cache, &exp->h, NULL))
                 return 0;
-        if (cache_put(&exp->h, &svc_export_cache)) BUG();
+        cache_put(&exp->h, &svc_export_cache);
         return svc_export_show(m, &svc_export_cache, cp);
 }
 
@@ -1129,7 +1262,6 @@ exp_delclient(struct nfsctl_client *ncp)
          */
         if (dom) {
                 err = auth_unix_forget_old(dom);
-                dom->h.expiry_time = get_seconds();
                 auth_domain_put(dom);
         }
 
diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
index 13369650cdf9..4b6aa60dfceb 100644
--- a/fs/nfsd/nfs4idmap.c
+++ b/fs/nfsd/nfs4idmap.c
@@ -76,21 +76,18 @@ struct ent {
         char              authname[IDMAP_NAMESZ];
 };
 
-#define DefineSimpleCacheLookupMap(STRUCT, FUNC)                        \
-        DefineCacheLookup(struct STRUCT, h, FUNC##_lookup,              \
-        (struct STRUCT *item, int set), /*no setup */,                  \
-        & FUNC##_cache, FUNC##_hash(item), FUNC##_match(item, tmp),     \
-        STRUCT##_init(new, item), STRUCT##_update(tmp, item), 0)
-
 /* Common entry handling */
 
 #define ENT_HASHBITS          8
 #define ENT_HASHMAX           (1 << ENT_HASHBITS)
 #define ENT_HASHMASK          (ENT_HASHMAX - 1)
 
-static inline void
-ent_init(struct ent *new, struct ent *itm)
+static void
+ent_init(struct cache_head *cnew, struct cache_head *citm)
 {
+        struct ent *new = container_of(cnew, struct ent, h);
+        struct ent *itm = container_of(citm, struct ent, h);
+
         new->id = itm->id;
         new->type = itm->type;
 
@@ -98,19 +95,21 @@ ent_init(struct ent *new, struct ent *itm)
         strlcpy(new->authname, itm->authname, sizeof(new->name));
 }
 
-static inline void
-ent_update(struct ent *new, struct ent *itm)
+static void
+ent_put(struct kref *ref)
 {
-        ent_init(new, itm);
+        struct ent *map = container_of(ref, struct ent, h.ref);
+        kfree(map);
 }
 
-static void
-ent_put(struct cache_head *ch, struct cache_detail *cd)
+static struct cache_head *
+ent_alloc(void)
 {
-        if (cache_put(ch, cd)) {
-                struct ent *map = container_of(ch, struct ent, h);
-                kfree(map);
-        }
+        struct ent *e = kmalloc(sizeof(*e), GFP_KERNEL);
+        if (e)
+                return &e->h;
+        else
+                return NULL;
 }
 
 /*
@@ -149,9 +148,12 @@ idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
         (*bpp)[-1] = '\n';
 }
 
-static inline int
-idtoname_match(struct ent *a, struct ent *b)
+static int
+idtoname_match(struct cache_head *ca, struct cache_head *cb)
 {
+        struct ent *a = container_of(ca, struct ent, h);
+        struct ent *b = container_of(cb, struct ent, h);
+
         return (a->id == b->id && a->type == b->type &&
             strcmp(a->authname, b->authname) == 0);
 }
@@ -184,7 +186,8 @@ warn_no_idmapd(struct cache_detail *detail)
 
 
 static int         idtoname_parse(struct cache_detail *, char *, int);
-static struct ent *idtoname_lookup(struct ent *, int);
+static struct ent *idtoname_lookup(struct ent *);
+static struct ent *idtoname_update(struct ent *, struct ent *);
 
 static struct cache_detail idtoname_cache = {
         .owner          = THIS_MODULE,
@@ -196,6 +199,10 @@ static struct cache_detail idtoname_cache = {
         .cache_parse    = idtoname_parse,
         .cache_show     = idtoname_show,
         .warn_no_listener = warn_no_idmapd,
+        .match          = idtoname_match,
+        .init           = ent_init,
+        .update         = ent_init,
+        .alloc          = ent_alloc,
 };
 
 int
@@ -238,6 +245,11 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
         if (ent.h.expiry_time == 0)
                 goto out;
 
+        error = -ENOMEM;
+        res = idtoname_lookup(&ent);
+        if (!res)
+                goto out;
+
         /* Name */
         error = qword_get(&buf, buf1, PAGE_SIZE);
         if (error == -EINVAL)
@@ -252,10 +264,11 @@ idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
                 memcpy(ent.name, buf1, sizeof(ent.name));
         }
         error = -ENOMEM;
-        if ((res = idtoname_lookup(&ent, 1)) == NULL)
+        res = idtoname_update(&ent, res);
+        if (res == NULL)
                 goto out;
 
-        ent_put(&res->h, &idtoname_cache);
+        cache_put(&res->h, &idtoname_cache);
 
         error = 0;
 out:
@@ -264,7 +277,31 @@ out:
         return error;
 }
 
-static DefineSimpleCacheLookupMap(ent, idtoname);
+
+static struct ent *
+idtoname_lookup(struct ent *item)
+{
+        struct cache_head *ch = sunrpc_cache_lookup(&idtoname_cache,
+                                                    &item->h,
+                                                    idtoname_hash(item));
+        if (ch)
+                return container_of(ch, struct ent, h);
+        else
+                return NULL;
+}
+
+static struct ent *
+idtoname_update(struct ent *new, struct ent *old)
+{
+        struct cache_head *ch = sunrpc_cache_update(&idtoname_cache,
+                                                    &new->h, &old->h,
+                                                    idtoname_hash(new));
+        if (ch)
+                return container_of(ch, struct ent, h);
+        else
+                return NULL;
+}
+
 
 /*
  * Name -> ID cache
@@ -291,9 +328,12 @@ nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
         (*bpp)[-1] = '\n';
 }
 
-static inline int
-nametoid_match(struct ent *a, struct ent *b)
+static int
+nametoid_match(struct cache_head *ca, struct cache_head *cb)
 {
+        struct ent *a = container_of(ca, struct ent, h);
+        struct ent *b = container_of(cb, struct ent, h);
+
         return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
             strcmp(a->authname, b->authname) == 0);
 }
@@ -317,7 +357,8 @@ nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
         return 0;
 }
 
-static struct ent *nametoid_lookup(struct ent *, int);
+static struct ent *nametoid_lookup(struct ent *);
+static struct ent *nametoid_update(struct ent *, struct ent *);
 static int         nametoid_parse(struct cache_detail *, char *, int);
 
 static struct cache_detail nametoid_cache = {
@@ -330,6 +371,10 @@ static struct cache_detail nametoid_cache = {
         .cache_parse    = nametoid_parse,
         .cache_show     = nametoid_show,
         .warn_no_listener = warn_no_idmapd,
+        .match          = nametoid_match,
+        .init           = ent_init,
+        .update         = ent_init,
+        .alloc          = ent_alloc,
 };
 
 static int
@@ -379,10 +424,14 @@ nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
                 set_bit(CACHE_NEGATIVE, &ent.h.flags);
 
         error = -ENOMEM;
-        if ((res = nametoid_lookup(&ent, 1)) == NULL)
+        res = nametoid_lookup(&ent);
+        if (res == NULL)
+                goto out;
+        res = nametoid_update(&ent, res);
+        if (res == NULL)
                 goto out;
 
-        ent_put(&res->h, &nametoid_cache);
+        cache_put(&res->h, &nametoid_cache);
         error = 0;
 out:
         kfree(buf1);
@@ -390,7 +439,30 @@ out:
         return (error);
 }
 
-static DefineSimpleCacheLookupMap(ent, nametoid);
+
+static struct ent *
+nametoid_lookup(struct ent *item)
+{
+        struct cache_head *ch = sunrpc_cache_lookup(&nametoid_cache,
+                                                    &item->h,
+                                                    nametoid_hash(item));
+        if (ch)
+                return container_of(ch, struct ent, h);
+        else
+                return NULL;
+}
+
+static struct ent *
+nametoid_update(struct ent *new, struct ent *old)
+{
+        struct cache_head *ch = sunrpc_cache_update(&nametoid_cache,
+                                                    &new->h, &old->h,
+                                                    nametoid_hash(new));
+        if (ch)
+                return container_of(ch, struct ent, h);
+        else
+                return NULL;
+}
 
 /*
  * Exported API
@@ -458,24 +530,24 @@ idmap_defer(struct cache_req *req)
 }
 
 static inline int
-do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *), struct ent *key,
                 struct cache_detail *detail, struct ent **item,
                 struct idmap_defer_req *mdr)
 {
-        *item = lookup_fn(key, 0);
+        *item = lookup_fn(key);
         if (!*item)
                 return -ENOMEM;
         return cache_check(detail, &(*item)->h, &mdr->req);
 }
 
 static inline int
-do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *, int),
+do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *),
                         struct ent *key, struct cache_detail *detail,
                         struct ent **item)
 {
         int ret = -ENOMEM;
 
-        *item = lookup_fn(key, 0);
+        *item = lookup_fn(key);
         if (!*item)
                 goto out_err;
         ret = -ETIMEDOUT;
@@ -488,7 +560,7 @@ do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *, int),
                 goto out_put;
         return 0;
 out_put:
-        ent_put(&(*item)->h, detail);
+        cache_put(&(*item)->h, detail);
 out_err:
         *item = NULL;
         return ret;
@@ -496,7 +568,7 @@ out_err:
 
 static int
 idmap_lookup(struct svc_rqst *rqstp,
-                struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+                struct ent *(*lookup_fn)(struct ent *), struct ent *key,
                 struct cache_detail *detail, struct ent **item)
 {
         struct idmap_defer_req *mdr;
@@ -539,7 +611,7 @@ idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen
         if (ret)
                 return ret;
         *id = item->id;
-        ent_put(&item->h, &nametoid_cache);
+        cache_put(&item->h, &nametoid_cache);
         return 0;
 }
 
@@ -561,7 +633,7 @@ idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
         ret = strlen(item->name);
         BUG_ON(ret > IDMAP_NAMESZ);
         memcpy(name, item->name, ret);
-        ent_put(&item->h, &idtoname_cache);
+        cache_put(&item->h, &idtoname_cache);
         return ret;
 }
 
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index c8960aff0968..3ef017b3b5bd 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -134,7 +134,7 @@ static ssize_t nfsctl_transaction_read(struct file *file, char __user *buf, size
         return simple_transaction_read(file, buf, size, pos);
 }
 
-static struct file_operations transaction_ops = {
+static const struct file_operations transaction_ops = {
         .write          = nfsctl_transaction_write,
         .read           = nfsctl_transaction_read,
         .release        = simple_transaction_release,
@@ -146,7 +146,7 @@ static int exports_open(struct inode *inode, struct file *file)
         return seq_open(file, &nfs_exports_op);
 }
 
-static struct file_operations exports_operations = {
+static const struct file_operations exports_operations = {
         .open           = exports_open,
         .read           = seq_read,
         .llseek         = seq_lseek,
diff --git a/fs/nfsd/nfsfh.c b/fs/nfsd/nfsfh.c
index 7a3e397b4ed3..3f2ec2e6d06c 100644
--- a/fs/nfsd/nfsfh.c
+++ b/fs/nfsd/nfsfh.c
@@ -506,7 +506,7 @@ fh_put(struct svc_fh *fhp)
                 nfsd_nr_put++;
         }
         if (exp) {
-                svc_export_put(&exp->h, &svc_export_cache);
+                cache_put(&exp->h, &svc_export_cache);
                 fhp->fh_export = NULL;
         }
         return;
diff --git a/fs/nfsd/stats.c b/fs/nfsd/stats.c
index 1cf955bcc526..57265d563804 100644
--- a/fs/nfsd/stats.c
+++ b/fs/nfsd/stats.c
@@ -80,7 +80,7 @@ static int nfsd_proc_open(struct inode *inode, struct file *file)
         return single_open(file, nfsd_proc_show, NULL);
 }
 
-static struct file_operations nfsd_proc_fops = {
+static const struct file_operations nfsd_proc_fops = {
         .owner = THIS_MODULE,
         .open = nfsd_proc_open,
         .read  = seq_read,
diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index 5320e5afaddb..31018333dc38 100644
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -706,7 +706,7 @@ nfsd_close(struct file *filp)
  * after it.
  */
 static inline int nfsd_dosync(struct file *filp, struct dentry *dp,
-                              struct file_operations *fop)
+                              const struct file_operations *fop)
 {
         struct inode *inode = dp->d_inode;
         int (*fsync) (struct file *, struct dentry *, int);
diff --git a/fs/ntfs/dir.c b/fs/ntfs/dir.c
index 9d9ed3fe371d..d1e2c6f9f05e 100644
--- a/fs/ntfs/dir.c
+++ b/fs/ntfs/dir.c
@@ -1553,7 +1553,7 @@ static int ntfs_dir_fsync(struct file *filp, struct dentry *dentry,
 
 #endif /* NTFS_RW */
 
-struct file_operations ntfs_dir_ops = {
+const struct file_operations ntfs_dir_ops = {
         .llseek         = generic_file_llseek,  /* Seek inside directory. */
         .read           = generic_read_dir,     /* Return -EISDIR. */
         .readdir        = ntfs_readdir,         /* Read directory contents. */
diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index f5d057e4acc2..c63a83e8da98 100644
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -2294,7 +2294,7 @@ static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
 
 #endif /* NTFS_RW */
 
-struct file_operations ntfs_file_ops = {
+const struct file_operations ntfs_file_ops = {
         .llseek         = generic_file_llseek,   /* Seek inside file. */
         .read           = generic_file_read,     /* Read from file. */
         .aio_read       = generic_file_aio_read, /* Async read from file. */
@@ -2337,6 +2337,6 @@ struct inode_operations ntfs_file_inode_ops = {
 #endif /* NTFS_RW */
 };
 
-struct file_operations ntfs_empty_file_ops = {};
+const struct file_operations ntfs_empty_file_ops = {};
 
 struct inode_operations ntfs_empty_inode_ops = {};
diff --git a/fs/ntfs/ntfs.h b/fs/ntfs/ntfs.h
index 166142960b53..bf7b3d7c0930 100644
--- a/fs/ntfs/ntfs.h
+++ b/fs/ntfs/ntfs.h
@@ -60,13 +60,13 @@ extern struct kmem_cache *ntfs_index_ctx_cache;
 extern struct address_space_operations ntfs_aops;
 extern struct address_space_operations ntfs_mst_aops;
 
-extern struct  file_operations ntfs_file_ops;
+extern const struct  file_operations ntfs_file_ops;
 extern struct inode_operations ntfs_file_inode_ops;
 
-extern struct  file_operations ntfs_dir_ops;
+extern const struct  file_operations ntfs_dir_ops;
 extern struct inode_operations ntfs_dir_inode_ops;
 
-extern struct  file_operations ntfs_empty_file_ops;
+extern const struct  file_operations ntfs_empty_file_ops;
 extern struct inode_operations ntfs_empty_inode_ops;
 
 extern struct export_operations ntfs_export_ops;
diff --git a/fs/ocfs2/dlmglue.c b/fs/ocfs2/dlmglue.c
index 84f153aca692..64cd52860c87 100644
--- a/fs/ocfs2/dlmglue.c
+++ b/fs/ocfs2/dlmglue.c
@@ -2017,7 +2017,7 @@ out:
         return ret;
 }
 
-static struct file_operations ocfs2_dlm_debug_fops = {
+static const struct file_operations ocfs2_dlm_debug_fops = {
         .open =         ocfs2_dlm_debug_open,
         .release =      ocfs2_dlm_debug_release,
         .read =         seq_read,
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index 4b4cbadd5838..34e903a6a46b 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -1176,7 +1176,7 @@ struct inode_operations ocfs2_special_file_iops = {
         .getattr        = ocfs2_getattr,
 };
 
-struct file_operations ocfs2_fops = {
+const struct file_operations ocfs2_fops = {
         .read           = do_sync_read,
         .write          = do_sync_write,
         .sendfile       = generic_file_sendfile,
@@ -1188,7 +1188,7 @@ struct file_operations ocfs2_fops = {
         .aio_write      = ocfs2_file_aio_write,
 };
 
-struct file_operations ocfs2_dops = {
+const struct file_operations ocfs2_dops = {
         .read           = generic_read_dir,
         .readdir        = ocfs2_readdir,
         .fsync          = ocfs2_sync_file,
diff --git a/fs/ocfs2/file.h b/fs/ocfs2/file.h
index a5ea33b24060..740c9e7ca599 100644
--- a/fs/ocfs2/file.h
+++ b/fs/ocfs2/file.h
@@ -26,8 +26,8 @@
 #ifndef OCFS2_FILE_H
 #define OCFS2_FILE_H
 
-extern struct file_operations ocfs2_fops;
-extern struct file_operations ocfs2_dops;
+extern const struct file_operations ocfs2_fops;
+extern const struct file_operations ocfs2_dops;
 extern struct inode_operations ocfs2_file_iops;
 extern struct inode_operations ocfs2_special_file_iops;
 struct ocfs2_alloc_context;
diff --git a/fs/openpromfs/inode.c b/fs/openpromfs/inode.c
index aeb0106890e4..0f14276a2e51 100644
--- a/fs/openpromfs/inode.c
+++ b/fs/openpromfs/inode.c
@@ -581,17 +581,17 @@ int property_release (struct inode *inode, struct file *filp)
         return 0;
 }
 
-static struct file_operations openpromfs_prop_ops = {
+static const struct file_operations openpromfs_prop_ops = {
         .read           = property_read,
         .write          = property_write,
         .release        = property_release,
 };
 
-static struct file_operations openpromfs_nodenum_ops = {
+static const struct file_operations openpromfs_nodenum_ops = {
         .read           = nodenum_read,
 };
 
-static struct file_operations openprom_operations = {
+static const struct file_operations openprom_operations = {
         .read           = generic_read_dir,
         .readdir        = openpromfs_readdir,
 };
diff --git a/fs/partitions/check.c b/fs/partitions/check.c
index f924f459bdb8..af0cb4b9e784 100644
--- a/fs/partitions/check.c
+++ b/fs/partitions/check.c
@@ -297,6 +297,25 @@ struct kobj_type ktype_part = {
         .sysfs_ops      = &part_sysfs_ops,
 };
 
+static inline void partition_sysfs_add_subdir(struct hd_struct *p)
+{
+        struct kobject *k;
+
+        k = kobject_get(&p->kobj);
+        p->holder_dir = kobject_add_dir(k, "holders");
+        kobject_put(k);
+}
+
+static inline void disk_sysfs_add_subdirs(struct gendisk *disk)
+{
+        struct kobject *k;
+
+        k = kobject_get(&disk->kobj);
+        disk->holder_dir = kobject_add_dir(k, "holders");
+        disk->slave_dir = kobject_add_dir(k, "slaves");
+        kobject_put(k);
+}
+
 void delete_partition(struct gendisk *disk, int part)
 {
         struct hd_struct *p = disk->part[part-1];
@@ -310,6 +329,8 @@ void delete_partition(struct gendisk *disk, int part)
         p->ios[0] = p->ios[1] = 0;
         p->sectors[0] = p->sectors[1] = 0;
         devfs_remove("%s/part%d", disk->devfs_name, part);
+        if (p->holder_dir)
+                kobject_unregister(p->holder_dir);
         kobject_unregister(&p->kobj);
 }
 
@@ -337,6 +358,7 @@ void add_partition(struct gendisk *disk, int part, sector_t start, sector_t len)
         p->kobj.parent = &disk->kobj;
         p->kobj.ktype = &ktype_part;
         kobject_register(&p->kobj);
+        partition_sysfs_add_subdir(p);
         disk->part[part-1] = p;
 }
 
@@ -383,6 +405,7 @@ void register_disk(struct gendisk *disk)
         if ((err = kobject_add(&disk->kobj)))
                 return;
         disk_sysfs_symlinks(disk);
+        disk_sysfs_add_subdirs(disk);
         kobject_uevent(&disk->kobj, KOBJ_ADD);
 
         /* No minors to use for partitions */
@@ -483,6 +506,10 @@ void del_gendisk(struct gendisk *disk)
 
         devfs_remove_disk(disk);
 
+        if (disk->holder_dir)
+                kobject_unregister(disk->holder_dir);
+        if (disk->slave_dir)
+                kobject_unregister(disk->slave_dir);
         if (disk->driverfs_dev) {
                 char *disk_name = make_block_name(disk);
                 sysfs_remove_link(&disk->kobj, "device");
diff --git a/fs/pipe.c b/fs/pipe.c
index 4384c9290943..e2f4f1d9ffc2 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -568,7 +568,7 @@ pipe_rdwr_open(struct inode *inode, struct file *filp)
  * The file_operations structs are not static because they
  * are also used in linux/fs/fifo.c to do operations on FIFOs.
  */
-struct file_operations read_fifo_fops = {
+const struct file_operations read_fifo_fops = {
         .llseek         = no_llseek,
         .read           = pipe_read,
         .readv          = pipe_readv,
@@ -580,7 +580,7 @@ struct file_operations read_fifo_fops = {
         .fasync         = pipe_read_fasync,
 };
 
-struct file_operations write_fifo_fops = {
+const struct file_operations write_fifo_fops = {
         .llseek         = no_llseek,
         .read           = bad_pipe_r,
         .write          = pipe_write,
@@ -592,7 +592,7 @@ struct file_operations write_fifo_fops = {
         .fasync         = pipe_write_fasync,
 };
 
-struct file_operations rdwr_fifo_fops = {
+const struct file_operations rdwr_fifo_fops = {
         .llseek         = no_llseek,
         .read           = pipe_read,
         .readv          = pipe_readv,
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 47b7a20d45eb..4ba03009cf72 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -560,7 +560,7 @@ static void proc_kill_inodes(struct proc_dir_entry *de)
                 struct file * filp = list_entry(p, struct file, f_u.fu_list);
                 struct dentry * dentry = filp->f_dentry;
                 struct inode * inode;
-                struct file_operations *fops;
+                const struct file_operations *fops;
 
                 if (dentry->d_op != &proc_dentry_operations)
                         continue;
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 95a1cf32b838..0502f17b860d 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -30,7 +30,7 @@ do {						\
 
 #endif
 
-extern void create_seq_entry(char *name, mode_t mode, struct file_operations *f);
+extern void create_seq_entry(char *name, mode_t mode, const struct file_operations *f);
 extern int proc_exe_link(struct inode *, struct dentry **, struct vfsmount **);
 extern int proc_tid_stat(struct task_struct *,  char *);
 extern int proc_tgid_stat(struct task_struct *, char *);
diff --git a/fs/proc/kcore.c b/fs/proc/kcore.c
index adc2cd95169a..17f6e8fa1397 100644
--- a/fs/proc/kcore.c
+++ b/fs/proc/kcore.c
@@ -31,7 +31,7 @@ static int open_kcore(struct inode * inode, struct file * filp)
 
 static ssize_t read_kcore(struct file *, char __user *, size_t, loff_t *);
 
-struct file_operations proc_kcore_operations = {
+const struct file_operations proc_kcore_operations = {
         .read           = read_kcore,
         .open           = open_kcore,
 };
diff --git a/fs/proc/kmsg.c b/fs/proc/kmsg.c
index 10d37bf25206..ff3b90b56e9d 100644
--- a/fs/proc/kmsg.c
+++ b/fs/proc/kmsg.c
@@ -47,7 +47,7 @@ static unsigned int kmsg_poll(struct file *file, poll_table *wait)
 }
 
 
-struct file_operations proc_kmsg_operations = {
+const struct file_operations proc_kmsg_operations = {
         .read           = kmsg_read,
         .poll           = kmsg_poll,
         .open           = kmsg_open,
diff --git a/fs/proc/proc_misc.c b/fs/proc/proc_misc.c
index 1e9ea37d457e..ef5a3323f4b5 100644
--- a/fs/proc/proc_misc.c
+++ b/fs/proc/proc_misc.c
@@ -534,7 +534,7 @@ static int show_stat(struct seq_file *p, void *v)
         if (wall_to_monotonic.tv_nsec)
                 --jif;
 
-        for_each_cpu(i) {
+        for_each_possible_cpu(i) {
                 int j;
 
                 user = cputime64_add(user, kstat_cpu(i).cpustat.user);
@@ -731,7 +731,7 @@ static struct file_operations proc_sysrq_trigger_operations = {
 
 struct proc_dir_entry *proc_root_kcore;
 
-void create_seq_entry(char *name, mode_t mode, struct file_operations *f)
+void create_seq_entry(char *name, mode_t mode, const struct file_operations *f)
 {
         struct proc_dir_entry *entry;
         entry = create_proc_entry(name, mode, NULL);
diff --git a/fs/proc/vmcore.c b/fs/proc/vmcore.c
index 4063fb32f78c..7efa73d44c9a 100644
--- a/fs/proc/vmcore.c
+++ b/fs/proc/vmcore.c
@@ -172,7 +172,7 @@ static int open_vmcore(struct inode *inode, struct file *filp)
         return 0;
 }
 
-struct file_operations proc_vmcore_operations = {
+const struct file_operations proc_vmcore_operations = {
         .read           = read_vmcore,
         .open           = open_vmcore,
 };
diff --git a/fs/qnx4/dir.c b/fs/qnx4/dir.c
index 7a8f5595c26f..9031948fefd0 100644
--- a/fs/qnx4/dir.c
+++ b/fs/qnx4/dir.c
@@ -81,7 +81,7 @@ out:
         return 0;
 }
 
-struct file_operations qnx4_dir_operations =
+const struct file_operations qnx4_dir_operations =
 {
         .read           = generic_read_dir,
         .readdir        = qnx4_readdir,
diff --git a/fs/qnx4/file.c b/fs/qnx4/file.c
index c33963fded9e..62af4b1348bd 100644
--- a/fs/qnx4/file.c
+++ b/fs/qnx4/file.c
@@ -19,7 +19,7 @@
  * We have mostly NULL's here: the current defaults are ok for
  * the qnx4 filesystem.
  */
-struct file_operations qnx4_file_operations =
+const struct file_operations qnx4_file_operations =
 {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
diff --git a/fs/ramfs/file-mmu.c b/fs/ramfs/file-mmu.c
index 6ada2095b9ac..00a933eb820c 100644
--- a/fs/ramfs/file-mmu.c
+++ b/fs/ramfs/file-mmu.c
@@ -32,7 +32,7 @@ struct address_space_operations ramfs_aops = {
         .commit_write   = simple_commit_write
 };
 
-struct file_operations ramfs_file_operations = {
+const struct file_operations ramfs_file_operations = {
         .read           = generic_file_read,
         .write          = generic_file_write,
         .mmap           = generic_file_mmap,
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index b1ca234068f6..f443a84b98a5 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -33,7 +33,7 @@ struct address_space_operations ramfs_aops = {
         .commit_write           = simple_commit_write
 };
 
-struct file_operations ramfs_file_operations = {
+const struct file_operations ramfs_file_operations = {
         .mmap                   = ramfs_nommu_mmap,
         .get_unmapped_area      = ramfs_nommu_get_unmapped_area,
         .read                   = generic_file_read,
diff --git a/fs/ramfs/internal.h b/fs/ramfs/internal.h
index 272c8a7120b0..313237631b49 100644
--- a/fs/ramfs/internal.h
+++ b/fs/ramfs/internal.h
@@ -11,5 +11,5 @@
 
 
 extern struct address_space_operations ramfs_aops;
-extern struct file_operations ramfs_file_operations;
+extern const struct file_operations ramfs_file_operations;
 extern struct inode_operations ramfs_file_inode_operations;
diff --git a/fs/read_write.c b/fs/read_write.c
index 34b1bf259efd..6256ca81a718 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -19,7 +19,7 @@
 #include <asm/uaccess.h>
 #include <asm/unistd.h>
 
-struct file_operations generic_ro_fops = {
+const struct file_operations generic_ro_fops = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .mmap           = generic_file_readonly_mmap,
diff --git a/fs/reiserfs/dir.c b/fs/reiserfs/dir.c
index d71ac6579289..973c819f8033 100644
--- a/fs/reiserfs/dir.c
+++ b/fs/reiserfs/dir.c
@@ -18,7 +18,7 @@ static int reiserfs_readdir(struct file *, void *, filldir_t);
 static int reiserfs_dir_fsync(struct file *filp, struct dentry *dentry,
                               int datasync);
 
-struct file_operations reiserfs_dir_operations = {
+const struct file_operations reiserfs_dir_operations = {
         .read = generic_read_dir,
         .readdir = reiserfs_readdir,
         .fsync = reiserfs_dir_fsync,
diff --git a/fs/reiserfs/file.c b/fs/reiserfs/file.c
index d0c1e865963e..010094d14da6 100644
--- a/fs/reiserfs/file.c
+++ b/fs/reiserfs/file.c
@@ -1566,7 +1566,7 @@ static ssize_t reiserfs_aio_write(struct kiocb *iocb, const char __user * buf,
         return generic_file_aio_write(iocb, buf, count, pos);
 }
 
-struct file_operations reiserfs_file_operations = {
+const struct file_operations reiserfs_file_operations = {
         .read = generic_file_read,
         .write = reiserfs_file_write,
         .ioctl = reiserfs_ioctl,
diff --git a/fs/reiserfs/procfs.c b/fs/reiserfs/procfs.c
index ef6caed9336b..731688e1cfe3 100644
--- a/fs/reiserfs/procfs.c
+++ b/fs/reiserfs/procfs.c
@@ -470,7 +470,7 @@ static int r_open(struct inode *inode, struct file *file)
         return ret;
 }
 
-static struct file_operations r_file_operations = {
+static const struct file_operations r_file_operations = {
         .open = r_open,
         .read = seq_read,
         .llseek = seq_lseek,
diff --git a/fs/romfs/inode.c b/fs/romfs/inode.c
index c2fc424d7d5c..9b9eda7b335c 100644
--- a/fs/romfs/inode.c
+++ b/fs/romfs/inode.c
@@ -463,7 +463,7 @@ static struct address_space_operations romfs_aops = {
         .readpage = romfs_readpage
 };
 
-static struct file_operations romfs_dir_operations = {
+static const struct file_operations romfs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = romfs_readdir,
 };
diff --git a/fs/select.c b/fs/select.c
index 1815a57d2255..b3a3a1326af6 100644
--- a/fs/select.c
+++ b/fs/select.c
@@ -29,12 +29,6 @@
 #define ROUND_UP(x,y) (((x)+(y)-1)/(y))
 #define DEFAULT_POLLMASK (POLLIN | POLLOUT | POLLRDNORM | POLLWRNORM)
 
-struct poll_table_entry {
-        struct file * filp;
-        wait_queue_t wait;
-        wait_queue_head_t * wait_address;
-};
-
 struct poll_table_page {
         struct poll_table_page * next;
         struct poll_table_entry * entry;
@@ -64,13 +58,23 @@ void poll_initwait(struct poll_wqueues *pwq)
         init_poll_funcptr(&pwq->pt, __pollwait);
         pwq->error = 0;
         pwq->table = NULL;
+        pwq->inline_index = 0;
 }
 
 EXPORT_SYMBOL(poll_initwait);
 
+static void free_poll_entry(struct poll_table_entry *entry)
+{
+        remove_wait_queue(entry->wait_address,&entry->wait);
+        fput(entry->filp);
+}
+
 void poll_freewait(struct poll_wqueues *pwq)
 {
         struct poll_table_page * p = pwq->table;
+        int i;
+        for (i = 0; i < pwq->inline_index; i++)
+                free_poll_entry(pwq->inline_entries + i);
         while (p) {
                 struct poll_table_entry * entry;
                 struct poll_table_page *old;
@@ -78,8 +82,7 @@ void poll_freewait(struct poll_wqueues *pwq)
                 entry = p->entry;
                 do {
                         entry--;
-                        remove_wait_queue(entry->wait_address,&entry->wait);
-                        fput(entry->filp);
+                        free_poll_entry(entry);
                 } while (entry > p->entries);
                 old = p;
                 p = p->next;
@@ -89,12 +92,14 @@ void poll_freewait(struct poll_wqueues *pwq)
 
 EXPORT_SYMBOL(poll_freewait);
 
-static void __pollwait(struct file *filp, wait_queue_head_t *wait_address,
-                       poll_table *_p)
+static struct poll_table_entry *poll_get_entry(poll_table *_p)
 {
         struct poll_wqueues *p = container_of(_p, struct poll_wqueues, pt);
         struct poll_table_page *table = p->table;
 
+        if (p->inline_index < N_INLINE_POLL_ENTRIES)
+                return p->inline_entries + p->inline_index++;
+
         if (!table || POLL_TABLE_FULL(table)) {
                 struct poll_table_page *new_table;
 
@@ -102,7 +107,7 @@ static void __pollwait(struct file *filp, wait_queue_head_t *wait_address,
                 if (!new_table) {
                         p->error = -ENOMEM;
                         __set_current_state(TASK_RUNNING);
-                        return;
+                        return NULL;
                 }
                 new_table->entry = new_table->entries;
                 new_table->next = table;
@@ -110,16 +115,21 @@ static void __pollwait(struct file *filp, wait_queue_head_t *wait_address,
                 table = new_table;
         }
 
-        /* Add a new entry */
-        {
-                struct poll_table_entry * entry = table->entry;
-                table->entry = entry+1;
-                get_file(filp);
-                entry->filp = filp;
-                entry->wait_address = wait_address;
-                init_waitqueue_entry(&entry->wait, current);
-                add_wait_queue(wait_address,&entry->wait);
-        }
+        return table->entry++;
+}
+
+/* Add a new entry */
+static void __pollwait(struct file *filp, wait_queue_head_t *wait_address,
+                                poll_table *p)
+{
+        struct poll_table_entry *entry = poll_get_entry(p);
+        if (!entry)
+                return;
+        get_file(filp);
+        entry->filp = filp;
+        entry->wait_address = wait_address;
+        init_waitqueue_entry(&entry->wait, current);
+        add_wait_queue(wait_address,&entry->wait);
 }
 
 #define FDS_IN(fds, n)          (fds->in + n)
@@ -210,7 +220,7 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
                 for (i = 0; i < n; ++rinp, ++routp, ++rexp) {
                         unsigned long in, out, ex, all_bits, bit = 1, mask, j;
                         unsigned long res_in = 0, res_out = 0, res_ex = 0;
-                        struct file_operations *f_op = NULL;
+                        const struct file_operations *f_op = NULL;
                         struct file *file = NULL;
 
                         in = *inp++; out = *outp++; ex = *exp++;
@@ -221,17 +231,18 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
                         }
 
                         for (j = 0; j < __NFDBITS; ++j, ++i, bit <<= 1) {
+                                int fput_needed;
                                 if (i >= n)
                                         break;
                                 if (!(bit & all_bits))
                                         continue;
-                                file = fget(i);
+                                file = fget_light(i, &fput_needed);
                                 if (file) {
                                         f_op = file->f_op;
                                         mask = DEFAULT_POLLMASK;
                                         if (f_op && f_op->poll)
                                                 mask = (*f_op->poll)(file, retval ? NULL : wait);
-                                        fput(file);
+                                        fput_light(file, fput_needed);
                                         if ((mask & POLLIN_SET) && (in & bit)) {
                                                 res_in |= bit;
                                                 retval++;
@@ -284,16 +295,6 @@ int do_select(int n, fd_set_bits *fds, s64 *timeout)
         return retval;
 }
 
-static void *select_bits_alloc(int size)
-{
-        return kmalloc(6 * size, GFP_KERNEL);
-}
-
-static void select_bits_free(void *bits, int size)
-{
-        kfree(bits);
-}
-
 /*
  * We can actually return ERESTARTSYS instead of EINTR, but I'd
  * like to be certain this leads to no problems. So I return
@@ -312,6 +313,8 @@ static int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
         char *bits;
         int ret, size, max_fdset;
         struct fdtable *fdt;
+        /* Allocate small arguments on the stack to save memory and be faster */
+        char stack_fds[SELECT_STACK_ALLOC];
 
         ret = -EINVAL;
         if (n < 0)
@@ -332,7 +335,10 @@ static int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
          */
         ret = -ENOMEM;
         size = FDS_BYTES(n);
-        bits = select_bits_alloc(size);
+        if (6*size < SELECT_STACK_ALLOC)
+                bits = stack_fds;
+        else
+                bits = kmalloc(6 * size, GFP_KERNEL);
         if (!bits)
                 goto out_nofds;
         fds.in      = (unsigned long *)  bits;
@@ -367,7 +373,8 @@ static int core_sys_select(int n, fd_set __user *inp, fd_set __user *outp,
                 ret = -EFAULT;
 
 out:
-        select_bits_free(bits, size);
+        if (bits != stack_fds)
+                kfree(bits);
 out_nofds:
         return ret;
 }
@@ -551,14 +558,15 @@ static void do_pollfd(unsigned int num, struct pollfd * fdpage,
                 fdp = fdpage+i;
                 fd = fdp->fd;
                 if (fd >= 0) {
-                        struct file * file = fget(fd);
+                        int fput_needed;
+                        struct file * file = fget_light(fd, &fput_needed);
                         mask = POLLNVAL;
                         if (file != NULL) {
                                 mask = DEFAULT_POLLMASK;
                                 if (file->f_op && file->f_op->poll)
                                         mask = file->f_op->poll(file, *pwait);
                                 mask &= fdp->events | POLLERR | POLLHUP;
-                                fput(file);
+                                fput_light(file, fput_needed);
                         }
                         if (mask) {
                                 *pwait = NULL;
@@ -619,6 +627,9 @@ static int do_poll(unsigned int nfds,  struct poll_list *list,
         return count;
 }
 
+#define N_STACK_PPS ((sizeof(stack_pps) - sizeof(struct poll_list))  / \
+                        sizeof(struct pollfd))
+
 int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
 {
         struct poll_wqueues table;
@@ -628,6 +639,9 @@ int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
         struct poll_list *walk;
         struct fdtable *fdt;
         int max_fdset;
+        /* Allocate small arguments on the stack to save memory and be faster */
+        char stack_pps[POLL_STACK_ALLOC];
+        struct poll_list *stack_pp = NULL;
 
         /* Do a sanity check on nfds ... */
         rcu_read_lock();
@@ -645,14 +659,23 @@ int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
         err = -ENOMEM;
         while(i!=0) {
                 struct poll_list *pp;
-                pp = kmalloc(sizeof(struct poll_list)+
-                                sizeof(struct pollfd)*
-                                (i>POLLFD_PER_PAGE?POLLFD_PER_PAGE:i),
-                                        GFP_KERNEL);
-                if(pp==NULL)
-                        goto out_fds;
+                int num, size;
+                if (stack_pp == NULL)
+                        num = N_STACK_PPS;
+                else
+                        num = POLLFD_PER_PAGE;
+                if (num > i)
+                        num = i;
+                size = sizeof(struct poll_list) + sizeof(struct pollfd)*num;
+                if (!stack_pp)
+                        stack_pp = pp = (struct poll_list *)stack_pps;
+                else {
+                        pp = kmalloc(size, GFP_KERNEL);
+                        if (!pp)
+                                goto out_fds;
+                }
                 pp->next=NULL;
-                pp->len = (i>POLLFD_PER_PAGE?POLLFD_PER_PAGE:i);
+                pp->len = num;
                 if (head == NULL)
                         head = pp;
                 else
@@ -660,7 +683,7 @@ int do_sys_poll(struct pollfd __user *ufds, unsigned int nfds, s64 *timeout)
 
                 walk = pp;
                 if (copy_from_user(pp->entries, ufds + nfds-i, 
-                                sizeof(struct pollfd)*pp->len)) {
+                                sizeof(struct pollfd)*num)) {
                         err = -EFAULT;
                         goto out_fds;
                 }
@@ -689,7 +712,8 @@ out_fds:
         walk = head;
         while(walk!=NULL) {
                 struct poll_list *pp = walk->next;
-                kfree(walk);
+                if (walk != stack_pp)
+                        kfree(walk);
                 walk = pp;
         }
         poll_freewait(&table);
diff --git a/fs/smbfs/dir.c b/fs/smbfs/dir.c
index 0424d06b147e..34c7a11d91f0 100644
--- a/fs/smbfs/dir.c
+++ b/fs/smbfs/dir.c
@@ -34,7 +34,7 @@ static int smb_rename(struct inode *, struct dentry *,
 static int smb_make_node(struct inode *,struct dentry *,int,dev_t);
 static int smb_link(struct dentry *, struct inode *, struct dentry *);
 
-struct file_operations smb_dir_operations =
+const struct file_operations smb_dir_operations =
 {
         .read           = generic_read_dir,
         .readdir        = smb_readdir,
diff --git a/fs/smbfs/file.c b/fs/smbfs/file.c
index 7042e62726a4..c56bd99a9701 100644
--- a/fs/smbfs/file.c
+++ b/fs/smbfs/file.c
@@ -401,7 +401,7 @@ smb_file_permission(struct inode *inode, int mask, struct nameidata *nd)
         return error;
 }
 
-struct file_operations smb_file_operations =
+const struct file_operations smb_file_operations =
 {
         .llseek         = remote_llseek,
         .read           = smb_file_read,
diff --git a/fs/smbfs/proto.h b/fs/smbfs/proto.h
index e866ec8660d0..47664597e6b1 100644
--- a/fs/smbfs/proto.h
+++ b/fs/smbfs/proto.h
@@ -35,7 +35,7 @@ extern int smb_proc_symlink(struct smb_sb_info *server, struct dentry *d, const
 extern int smb_proc_link(struct smb_sb_info *server, struct dentry *dentry, struct dentry *new_dentry);
 extern void smb_install_null_ops(struct smb_ops *ops);
 /* dir.c */
-extern struct file_operations smb_dir_operations;
+extern const struct file_operations smb_dir_operations;
 extern struct inode_operations smb_dir_inode_operations;
 extern struct inode_operations smb_dir_inode_operations_unix;
 extern void smb_new_dentry(struct dentry *dentry);
@@ -64,7 +64,7 @@ extern int smb_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat
 extern int smb_notify_change(struct dentry *dentry, struct iattr *attr);
 /* file.c */
 extern struct address_space_operations smb_file_aops;
-extern struct file_operations smb_file_operations;
+extern const struct file_operations smb_file_operations;
 extern struct inode_operations smb_file_inode_operations;
 /* ioctl.c */
 extern int smb_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, unsigned long arg);
diff --git a/fs/sysfs/bin.c b/fs/sysfs/bin.c
index 78899eeab974..c16a93c353c0 100644
--- a/fs/sysfs/bin.c
+++ b/fs/sysfs/bin.c
@@ -163,7 +163,7 @@ static int release(struct inode * inode, struct file * file)
         return 0;
 }
 
-struct file_operations bin_fops = {
+const struct file_operations bin_fops = {
         .read           = read,
         .write          = write,
         .mmap           = mmap,
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c
index 9ee956864445..f26880a4785e 100644
--- a/fs/sysfs/dir.c
+++ b/fs/sysfs/dir.c
@@ -503,7 +503,7 @@ static loff_t sysfs_dir_lseek(struct file * file, loff_t offset, int origin)
         return offset;
 }
 
-struct file_operations sysfs_dir_operations = {
+const struct file_operations sysfs_dir_operations = {
         .open           = sysfs_dir_open,
         .release        = sysfs_dir_close,
         .llseek         = sysfs_dir_lseek,
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 5e83e7246788..830f76fa098c 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -348,7 +348,7 @@ static int sysfs_release(struct inode * inode, struct file * filp)
         return 0;
 }
 
-struct file_operations sysfs_file_operations = {
+const struct file_operations sysfs_file_operations = {
         .read           = sysfs_read_file,
         .write          = sysfs_write_file,
         .llseek         = generic_file_llseek,
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index cf11d5b789d9..32958a7c50e9 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -21,9 +21,9 @@ extern int sysfs_setattr(struct dentry *dentry, struct iattr *iattr);
 
 extern struct rw_semaphore sysfs_rename_sem;
 extern struct super_block * sysfs_sb;
-extern struct file_operations sysfs_dir_operations;
-extern struct file_operations sysfs_file_operations;
-extern struct file_operations bin_fops;
+extern const struct file_operations sysfs_dir_operations;
+extern const struct file_operations sysfs_file_operations;
+extern const struct file_operations bin_fops;
 extern struct inode_operations sysfs_dir_inode_operations;
 extern struct inode_operations sysfs_symlink_inode_operations;
 
diff --git a/fs/sysv/dir.c b/fs/sysv/dir.c
index cce8b05cba5a..8c66e9270dd6 100644
--- a/fs/sysv/dir.c
+++ b/fs/sysv/dir.c
@@ -20,7 +20,7 @@
 
 static int sysv_readdir(struct file *, void *, filldir_t);
 
-struct file_operations sysv_dir_operations = {
+const struct file_operations sysv_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = sysv_readdir,
         .fsync          = sysv_sync_file,
diff --git a/fs/sysv/file.c b/fs/sysv/file.c
index da69abc06240..a59e303135fa 100644
--- a/fs/sysv/file.c
+++ b/fs/sysv/file.c
@@ -19,7 +19,7 @@
  * We have mostly NULLs here: the current defaults are OK for
  * the coh filesystem.
  */
-struct file_operations sysv_file_operations = {
+const struct file_operations sysv_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/sysv/sysv.h b/fs/sysv/sysv.h
index b7f9b4a42aab..393a480e4deb 100644
--- a/fs/sysv/sysv.h
+++ b/fs/sysv/sysv.h
@@ -159,8 +159,8 @@ extern ino_t sysv_inode_by_name(struct dentry *);
 extern struct inode_operations sysv_file_inode_operations;
 extern struct inode_operations sysv_dir_inode_operations;
 extern struct inode_operations sysv_fast_symlink_inode_operations;
-extern struct file_operations sysv_file_operations;
-extern struct file_operations sysv_dir_operations;
+extern const struct file_operations sysv_file_operations;
+extern const struct file_operations sysv_dir_operations;
 extern struct address_space_operations sysv_aops;
 extern struct super_operations sysv_sops;
 extern struct dentry_operations sysv_dentry_operations;
diff --git a/fs/udf/dir.c b/fs/udf/dir.c
index f5222527fe39..8c28efa3b8ff 100644
--- a/fs/udf/dir.c
+++ b/fs/udf/dir.c
@@ -42,7 +42,7 @@ static int do_udf_readdir(struct inode *, struct file *, filldir_t, void *);
 
 /* readdir and lookup functions */
 
-struct file_operations udf_dir_operations = {
+const struct file_operations udf_dir_operations = {
         .read                   = generic_read_dir,
         .readdir                = udf_readdir,
         .ioctl                  = udf_ioctl,
diff --git a/fs/udf/file.c b/fs/udf/file.c
index a6f2acc1f15c..e34b00e303f1 100644
--- a/fs/udf/file.c
+++ b/fs/udf/file.c
@@ -248,7 +248,7 @@ static int udf_release_file(struct inode * inode, struct file * filp)
         return 0;
 }
 
-struct file_operations udf_file_operations = {
+const struct file_operations udf_file_operations = {
         .read                   = generic_file_read,
         .ioctl                  = udf_ioctl,
         .open                   = generic_file_open,
diff --git a/fs/udf/udfdecl.h b/fs/udf/udfdecl.h
index 1d5800e0cbe7..023e19ba5a2e 100644
--- a/fs/udf/udfdecl.h
+++ b/fs/udf/udfdecl.h
@@ -44,9 +44,9 @@ struct buffer_head;
 struct super_block;
 
 extern struct inode_operations udf_dir_inode_operations;
-extern struct file_operations udf_dir_operations;
+extern const struct file_operations udf_dir_operations;
 extern struct inode_operations udf_file_inode_operations;
-extern struct file_operations udf_file_operations;
+extern const struct file_operations udf_file_operations;
 extern struct address_space_operations udf_aops;
 extern struct address_space_operations udf_adinicb_aops;
 extern struct address_space_operations udf_symlink_aops;
diff --git a/fs/ufs/dir.c b/fs/ufs/dir.c
index 7c10c68902ae..1a561202d3f4 100644
--- a/fs/ufs/dir.c
+++ b/fs/ufs/dir.c
@@ -620,7 +620,7 @@ int ufs_empty_dir (struct inode * inode)
         return 1;
 }
 
-struct file_operations ufs_dir_operations = {
+const struct file_operations ufs_dir_operations = {
         .read           = generic_read_dir,
         .readdir        = ufs_readdir,
         .fsync          = file_fsync,
diff --git a/fs/ufs/file.c b/fs/ufs/file.c
index 62ad481810ef..312fd3f86313 100644
--- a/fs/ufs/file.c
+++ b/fs/ufs/file.c
@@ -31,7 +31,7 @@
  * the ufs filesystem.
  */
  
-struct file_operations ufs_file_operations = {
+const struct file_operations ufs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = generic_file_read,
         .write          = generic_file_write,
diff --git a/fs/xfs/linux-2.6/xfs_file.c b/fs/xfs/linux-2.6/xfs_file.c
index 185567a6a561..85997b1205f5 100644
--- a/fs/xfs/linux-2.6/xfs_file.c
+++ b/fs/xfs/linux-2.6/xfs_file.c
@@ -528,7 +528,7 @@ open_exec_out:
 }
 #endif /* HAVE_FOP_OPEN_EXEC */
 
-struct file_operations xfs_file_operations = {
+const struct file_operations xfs_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
@@ -550,7 +550,7 @@ struct file_operations xfs_file_operations = {
 #endif
 };
 
-struct file_operations xfs_invis_file_operations = {
+const struct file_operations xfs_invis_file_operations = {
         .llseek         = generic_file_llseek,
         .read           = do_sync_read,
         .write          = do_sync_write,
@@ -570,7 +570,7 @@ struct file_operations xfs_invis_file_operations = {
 };
 
 
-struct file_operations xfs_dir_file_operations = {
+const struct file_operations xfs_dir_file_operations = {
         .read           = generic_read_dir,
         .readdir        = xfs_file_readdir,
         .unlocked_ioctl = xfs_file_ioctl,
diff --git a/fs/xfs/linux-2.6/xfs_iops.h b/fs/xfs/linux-2.6/xfs_iops.h
index a8417d7af5f9..ad6173da5678 100644
--- a/fs/xfs/linux-2.6/xfs_iops.h
+++ b/fs/xfs/linux-2.6/xfs_iops.h
@@ -22,9 +22,9 @@ extern struct inode_operations xfs_inode_operations;
 extern struct inode_operations xfs_dir_inode_operations;
 extern struct inode_operations xfs_symlink_inode_operations;
 
-extern struct file_operations xfs_file_operations;
-extern struct file_operations xfs_dir_file_operations;
-extern struct file_operations xfs_invis_file_operations;
+extern const struct file_operations xfs_file_operations;
+extern const struct file_operations xfs_dir_file_operations;
+extern const struct file_operations xfs_invis_file_operations;
 
 extern int xfs_ioctl(struct bhv_desc *, struct inode *, struct file *,
                         int, unsigned int, void __user *);