+ vfs-permit-filesystem-to-override-root-dentry-on-mount.patch added to -mm tree

[akpm@xxxxxxxx]

The patch titled

     VFS: Permit filesystem to override root dentry on mount

has been added to the -mm tree.  Its filename is

     vfs-permit-filesystem-to-override-root-dentry-on-mount.patch

See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this

------------------------------------------------------
Subject: VFS: Permit filesystem to override root dentry on mount
From: David Howells <dhowells@xxxxxxxxxx>


Extend the get_sb() filesystem operation to take an extra argument that
permits the VFS to pass in the target vfsmount that defines the mountpoint.

The filesystem is then required to manually set the superblock and root dentry
pointers.  For most filesystems, this should be done with simple_set_mnt()
which will set the superblock pointer and then set the root dentry to the
superblock's s_root (as per the old default behaviour).

The get_sb() op now returns an integer as there's now no need to return the
superblock pointer.

This patch permits a superblock to be implicitly shared amongst several mount
points, such as can be done with NFS to avoid potential inode aliasing.  In
such a case, simple_set_mnt() would not be called, and instead the mnt_root
and mnt_sb would be set directly.

The patch also makes the following changes:

 (*) the get_sb_*() convenience functions in the core kernel now take a vfsmount
     pointer argument and return an integer, so most filesystems have to change
     very little.

 (*) If one of the convenience function is not used, then get_sb() should
     normally call simple_set_mnt() to instantiate the vfsmount. This will
     always return 0, and so can be tail-called from get_sb().

 (*) generic_shutdown_super() now calls shrink_dcache_sb() to clean up the
     dcache upon superblock destruction rather than shrink_dcache_anon().

     This is required because the superblock may now have multiple trees that
     aren't actually bound to s_root, but that still need to be cleaned up. The
     currently called functions assume that the whole tree is rooted at s_root,
     and that anonymous dentries are not the roots of trees which results in
     dentries being left unculled.

     However, with the way NFS superblock sharing are currently set to be
     implemented, these assumptions are violated: the root of the filesystem is
     simply a dummy dentry and inode (the real inode for '/' may well be
     inaccessible), and all the vfsmounts are rooted on anonymous[*] dentries
     with child trees.

     [*] Anonymous until discovered from another tree.

 (*) The documentation has been adjusted, including the additional bit of
     changing ext2_* into foo_* in the documentation.

Signed-off-by: David Howells <dhowells@xxxxxxxxxx>
Acked-by: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Nathan Scott <nathans@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---

 Documentation/filesystems/Locking         |    7 -
 Documentation/filesystems/porting         |    7 -
 Documentation/filesystems/vfs.txt         |    4 
 arch/ia64/kernel/perfmon.c                |    7 -
 arch/powerpc/platforms/cell/spufs/inode.c |    6 -
 drivers/infiniband/core/uverbs_main.c     |    7 -
 drivers/isdn/capi/capifs.c                |    6 -
 drivers/misc/ibmasm/ibmasmfs.c            |    7 -
 drivers/oprofile/oprofilefs.c             |    6 -
 drivers/usb/core/inode.c                  |    6 -
 drivers/usb/gadget/inode.c                |    6 -
 fs/9p/vfs_super.c                         |   21 ++-
 fs/adfs/super.c                           |    7 -
 fs/affs/super.c                           |    7 -
 fs/afs/super.c                            |   24 ++--
 fs/autofs/init.c                          |    6 -
 fs/autofs4/init.c                         |    6 -
 fs/befs/linuxvfs.c                        |    7 -
 fs/bfs/inode.c                            |    6 -
 fs/binfmt_misc.c                          |    6 -
 fs/block_dev.c                            |    6 -
 fs/cifs/cifsfs.c                          |   10 -
 fs/coda/inode.c                           |    6 -
 fs/configfs/mount.c                       |    6 -
 fs/cramfs/inode.c                         |    7 -
 fs/dcache.c                               |   40 -------
 fs/debugfs/inode.c                        |    8 -
 fs/devfs/base.c                           |    8 -
 fs/devpts/inode.c                         |    6 -
 fs/efs/super.c                            |    6 -
 fs/eventpoll.c                            |   13 +-
 fs/ext2/super.c                           |    6 -
 fs/ext3/super.c                           |    6 -
 fs/freevxfs/vxfs_super.c                  |    7 -
 fs/fuse/inode.c                           |    8 -
 fs/hfs/super.c                            |    7 -
 fs/hfsplus/super.c                        |    8 -
 fs/hostfs/hostfs_kern.c                   |    8 -
 fs/hpfs/super.c                           |    7 -
 fs/hppfs/hppfs_kern.c                     |    8 -
 fs/hugetlbfs/inode.c                      |    6 -
 fs/inotify_user.c                         |    6 -
 fs/isofs/inode.c                          |    7 -
 fs/jffs/inode-v23.c                       |    7 -
 fs/jffs2/super.c                          |   49 ++++----
 fs/jfs/super.c                            |    7 -
 fs/libfs.c                                |   12 +-
 fs/minix/inode.c                          |    7 -
 fs/msdos/namei.c                          |    9 -
 fs/namespace.c                            |    9 +
 fs/ncpfs/inode.c                          |    6 -
 fs/nfs/inode.c                            |   96 ++++++++++-------
 fs/nfsd/nfsctl.c                          |    6 -
 fs/ntfs/super.c                           |    7 -
 fs/ocfs2/dlm/dlmfs.c                      |    6 -
 fs/ocfs2/super.c                          |   12 +-
 fs/openpromfs/inode.c                     |    6 -
 fs/pipe.c                                 |    9 -
 fs/proc/root.c                            |    6 -
 fs/qnx4/inode.c                           |    7 -
 fs/ramfs/inode.c                          |   13 +-
 fs/reiserfs/super.c                       |    9 -
 fs/romfs/inode.c                          |    7 -
 fs/smbfs/inode.c                          |    6 -
 fs/super.c                                |  109 +++++++++++---------
 fs/sysfs/mount.c                          |    6 -
 fs/sysv/super.c                           |   13 +-
 fs/udf/super.c                            |    6 -
 fs/ufs/super.c                            |    6 -
 fs/vfat/namei.c                           |    9 -
 fs/xfs/linux-2.6/xfs_super.c              |    8 -
 include/linux/dcache.h                    |    1 
 include/linux/fs.h                        |   25 ++--
 include/linux/ramfs.h                     |    4 
 ipc/mqueue.c                              |    8 -
 kernel/cpuset.c                           |    8 -
 kernel/futex.c                            |    8 -
 mm/shmem.c                                |    6 -
 net/socket.c                              |    7 -
 net/sunrpc/rpc_pipe.c                     |    6 -
 security/inode.c                          |    8 -
 security/selinux/selinuxfs.c              |    7 -
 82 files changed, 475 insertions(+), 425 deletions(-)

diff -puN arch/ia64/kernel/perfmon.c~vfs-permit-filesystem-to-override-root-dentry-on-mount arch/ia64/kernel/perfmon.c
--- a/arch/ia64/kernel/perfmon.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/arch/ia64/kernel/perfmon.c
@@ -595,10 +595,11 @@ pfm_get_unmapped_area(struct file *file,
 }
 
 
-static struct super_block *
-pfmfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data)
+static int
+pfmfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data,
+	     struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "pfm:", NULL, PFMFS_MAGIC);
+	return get_sb_pseudo(fs_type, "pfm:", NULL, PFMFS_MAGIC, mnt);
 }
 
 static struct file_system_type pfm_fs_type = {
diff -puN arch/powerpc/platforms/cell/spufs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount arch/powerpc/platforms/cell/spufs/inode.c
--- a/arch/powerpc/platforms/cell/spufs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/arch/powerpc/platforms/cell/spufs/inode.c
@@ -428,11 +428,11 @@ spufs_fill_super(struct super_block *sb,
 	return spufs_create_root(sb, data);
 }
 
-static struct super_block *
+static int
 spufs_get_sb(struct file_system_type *fstype, int flags,
-		const char *name, void *data)
+		const char *name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fstype, flags, data, spufs_fill_super);
+	return get_sb_single(fstype, flags, data, spufs_fill_super, mnt);
 }
 
 static struct file_system_type spufs_type = {
diff -puN Documentation/filesystems/Locking~vfs-permit-filesystem-to-override-root-dentry-on-mount Documentation/filesystems/Locking
--- a/Documentation/filesystems/Locking~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/Documentation/filesystems/Locking
@@ -142,15 +142,16 @@ see also dquot_operations section.
 
 --------------------------- file_system_type ---------------------------
 prototypes:
-	struct super_block *(*get_sb) (struct file_system_type *, int,
-			const char *, void *);
+	struct int (*get_sb) (struct file_system_type *, int,
+			const char *, void *, struct vfsmount *);
 	void (*kill_sb) (struct super_block *);
 locking rules:
 		may block	BKL
 get_sb		yes		yes
 kill_sb		yes		yes
 
-->get_sb() returns error or a locked superblock (exclusive on ->s_umount).
+->get_sb() returns error or 0 with locked superblock attached to the vfsmount
+(exclusive on ->s_umount).
 ->kill_sb() takes a write-locked superblock, does all shutdown work on it,
 unlocks and drops the reference.
 
diff -puN Documentation/filesystems/porting~vfs-permit-filesystem-to-override-root-dentry-on-mount Documentation/filesystems/porting
--- a/Documentation/filesystems/porting~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/Documentation/filesystems/porting
@@ -50,10 +50,11 @@ Turn your foo_read_super() into a functi
 success and negative number in case of error (-EINVAL unless you have more
 informative error value to report).  Call it foo_fill_super().  Now declare
 
-struct super_block foo_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+int foo_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, foo_fill_super,
+			   mnt);
 }
 
 (or similar with s/bdev/nodev/ or s/bdev/single/, depending on the kind of
diff -puN Documentation/filesystems/vfs.txt~vfs-permit-filesystem-to-override-root-dentry-on-mount Documentation/filesystems/vfs.txt
--- a/Documentation/filesystems/vfs.txt~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/Documentation/filesystems/vfs.txt
@@ -113,8 +113,8 @@ members are defined:
 struct file_system_type {
 	const char *name;
 	int fs_flags;
-        struct super_block *(*get_sb) (struct file_system_type *, int,
-                                       const char *, void *);
+        struct int (*get_sb) (struct file_system_type *, int,
+                              const char *, void *, struct vfsmount *);
         void (*kill_sb) (struct super_block *);
         struct module *owner;
         struct file_system_type * next;
diff -puN drivers/infiniband/core/uverbs_main.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/infiniband/core/uverbs_main.c
--- a/drivers/infiniband/core/uverbs_main.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/infiniband/core/uverbs_main.c
@@ -821,11 +821,12 @@ static void ib_uverbs_remove_one(struct 
 	kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 }
 
-static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
-					       const char *dev_name, void *data)
+static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
+			       const char *dev_name, void *data,
+			       struct vfsmount *mnt)
 {
 	return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
-			     INFINIBANDEVENTFS_MAGIC);
+			     INFINIBANDEVENTFS_MAGIC, mnt);
 }
 
 static struct file_system_type uverbs_event_fs = {
diff -puN drivers/isdn/capi/capifs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/isdn/capi/capifs.c
--- a/drivers/isdn/capi/capifs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/isdn/capi/capifs.c
@@ -121,10 +121,10 @@ fail:
 	return -ENOMEM;
 }
 
-static struct super_block *capifs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int capifs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, capifs_fill_super);
+	return get_sb_single(fs_type, flags, data, capifs_fill_super, mnt);
 }
 
 static struct file_system_type capifs_fs_type = {
diff -puN drivers/misc/ibmasm/ibmasmfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/misc/ibmasm/ibmasmfs.c
--- a/drivers/misc/ibmasm/ibmasmfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/misc/ibmasm/ibmasmfs.c
@@ -90,10 +90,11 @@ static void ibmasmfs_create_files (struc
 static int ibmasmfs_fill_super (struct super_block *sb, void *data, int silent);
 
 
-static struct super_block *ibmasmfs_get_super(struct file_system_type *fst,
-			int flags, const char *name, void *data)
+static int ibmasmfs_get_super(struct file_system_type *fst,
+			int flags, const char *name, void *data,
+			struct vfsmount *mnt)
 {
-	return get_sb_single(fst, flags, data, ibmasmfs_fill_super);
+	return get_sb_single(fst, flags, data, ibmasmfs_fill_super, mnt);
 }
 
 static struct super_operations ibmasmfs_s_ops = {
diff -puN drivers/oprofile/oprofilefs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/oprofile/oprofilefs.c
--- a/drivers/oprofile/oprofilefs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/oprofile/oprofilefs.c
@@ -272,10 +272,10 @@ static int oprofilefs_fill_super(struct 
 }
 
 
-static struct super_block *oprofilefs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int oprofilefs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, oprofilefs_fill_super);
+	return get_sb_single(fs_type, flags, data, oprofilefs_fill_super, mnt);
 }
 
 
diff -puN drivers/usb/core/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/usb/core/inode.c
--- a/drivers/usb/core/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/usb/core/inode.c
@@ -543,10 +543,10 @@ static void fs_remove_file (struct dentr
 
 /* --------------------------------------------------------------------- */
 
-static struct super_block *usb_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int usb_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, usbfs_fill_super);
+	return get_sb_single(fs_type, flags, data, usbfs_fill_super, mnt);
 }
 
 static struct file_system_type usb_fs_type = {
diff -puN drivers/usb/gadget/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount drivers/usb/gadget/inode.c
--- a/drivers/usb/gadget/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/drivers/usb/gadget/inode.c
@@ -2070,11 +2070,11 @@ enomem0:
 }
 
 /* "mount -t gadgetfs path /dev/gadget" ends up here */
-static struct super_block *
+static int
 gadgetfs_get_sb (struct file_system_type *t, int flags,
-		const char *path, void *opts)
+		const char *path, void *opts, struct vfsmount *mnt)
 {
-	return get_sb_single (t, flags, opts, gadgetfs_fill_super);
+	return get_sb_single (t, flags, opts, gadgetfs_fill_super, mnt);
 }
 
 static void
diff -puN fs/9p/vfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/9p/vfs_super.c
--- a/fs/9p/vfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/9p/vfs_super.c
@@ -99,12 +99,13 @@ v9fs_fill_super(struct super_block *sb, 
  * @flags: mount flags
  * @dev_name: device name that was mounted
  * @data: mount options
+ * @mnt: mountpoint record to be instantiated
  *
  */
 
-static struct super_block *v9fs_get_sb(struct file_system_type
-				       *fs_type, int flags,
-				       const char *dev_name, void *data)
+static int v9fs_get_sb(struct file_system_type *fs_type, int flags,
+		       const char *dev_name, void *data,
+		       struct vfsmount *mnt)
 {
 	struct super_block *sb = NULL;
 	struct v9fs_fcall *fcall = NULL;
@@ -123,17 +124,19 @@ static struct super_block *v9fs_get_sb(s
 
 	v9ses = kzalloc(sizeof(struct v9fs_session_info), GFP_KERNEL);
 	if (!v9ses)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 
 	if ((newfid = v9fs_session_init(v9ses, dev_name, data)) < 0) {
 		dprintk(DEBUG_ERROR, "problem initiating session\n");
-		sb = ERR_PTR(newfid);
+		retval = newfid;
 		goto out_free_session;
 	}
 
 	sb = sget(fs_type, NULL, v9fs_set_super, v9ses);
-	if (IS_ERR(sb))
+	if (IS_ERR(sb)) {
+		retval = PTR_ERR(sb);
 		goto out_close_session;
+	}
 	v9fs_fill_super(sb, v9ses, flags);
 
 	inode = v9fs_get_inode(sb, S_IFDIR | mode);
@@ -184,19 +187,19 @@ static struct super_block *v9fs_get_sb(s
 		goto put_back_sb;
 	}
 
-	return sb;
+	return simple_set_mnt(mnt, sb);
 
 out_close_session:
 	v9fs_session_close(v9ses);
 out_free_session:
 	kfree(v9ses);
-	return sb;
+	return retval;
 
 put_back_sb:
 	/* deactivate_super calls v9fs_kill_super which will frees the rest */
 	up_write(&sb->s_umount);
 	deactivate_super(sb);
-	return ERR_PTR(retval);
+	return retval;
 }
 
 /**
diff -puN fs/adfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/adfs/super.c
--- a/fs/adfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/adfs/super.c
@@ -470,10 +470,11 @@ error:
 	return -EINVAL;
 }
 
-static struct super_block *adfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int adfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, adfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type adfs_fs_type = {
diff -puN fs/affs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/affs/super.c
--- a/fs/affs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/affs/super.c
@@ -524,10 +524,11 @@ affs_statfs(struct super_block *sb, stru
 	return 0;
 }
 
-static struct super_block *affs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int affs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, affs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type affs_fs_type = {
diff -puN fs/afs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/afs/super.c
--- a/fs/afs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/afs/super.c
@@ -38,9 +38,9 @@ struct afs_mount_params {
 static void afs_i_init_once(void *foo, kmem_cache_t *cachep,
 			    unsigned long flags);
 
-static struct super_block *afs_get_sb(struct file_system_type *fs_type,
-				      int flags, const char *dev_name,
-				      void *data);
+static int afs_get_sb(struct file_system_type *fs_type,
+		      int flags, const char *dev_name,
+		      void *data, struct vfsmount *mnt);
 
 static struct inode *afs_alloc_inode(struct super_block *sb);
 
@@ -294,10 +294,11 @@ static int afs_fill_super(struct super_b
  * get an AFS superblock
  * - TODO: don't use get_sb_nodev(), but rather call sget() directly
  */
-static struct super_block *afs_get_sb(struct file_system_type *fs_type,
-				      int flags,
-				      const char *dev_name,
-				      void *options)
+static int afs_get_sb(struct file_system_type *fs_type,
+		      int flags,
+		      const char *dev_name,
+		      void *options,
+		      struct vfsmount *mnt)
 {
 	struct afs_mount_params params;
 	struct super_block *sb;
@@ -311,7 +312,7 @@ static struct super_block *afs_get_sb(st
 	ret = afscm_start();
 	if (ret < 0) {
 		_leave(" = %d", ret);
-		return ERR_PTR(ret);
+		return ret;
 	}
 
 	/* parse the options */
@@ -348,18 +349,19 @@ static struct super_block *afs_get_sb(st
 		goto error;
 	}
 	sb->s_flags |= MS_ACTIVE;
+	simple_set_mnt(mnt, sb);
 
 	afs_put_volume(params.volume);
 	afs_put_cell(params.default_cell);
-	_leave(" = %p", sb);
-	return sb;
+	_leave(" = 0 [%p]", 0, sb);
+	return 0;
 
  error:
 	afs_put_volume(params.volume);
 	afs_put_cell(params.default_cell);
 	afscm_stop();
 	_leave(" = %d", ret);
-	return ERR_PTR(ret);
+	return ret;
 } /* end afs_get_sb() */
 
 /*****************************************************************************/
diff -puN fs/autofs4/init.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/autofs4/init.c
--- a/fs/autofs4/init.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/autofs4/init.c
@@ -14,10 +14,10 @@
 #include <linux/init.h>
 #include "autofs_i.h"
 
-static struct super_block *autofs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int autofs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, autofs4_fill_super);
+	return get_sb_nodev(fs_type, flags, data, autofs4_fill_super, mnt);
 }
 
 static struct file_system_type autofs_fs_type = {
diff -puN fs/autofs/init.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/autofs/init.c
--- a/fs/autofs/init.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/autofs/init.c
@@ -14,10 +14,10 @@
 #include <linux/init.h>
 #include "autofs_i.h"
 
-static struct super_block *autofs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int autofs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, autofs_fill_super);
+	return get_sb_nodev(fs_type, flags, data, autofs_fill_super, mnt);
 }
 
 static struct file_system_type autofs_fs_type = {
diff -puN fs/befs/linuxvfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/befs/linuxvfs.c
--- a/fs/befs/linuxvfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/befs/linuxvfs.c
@@ -899,11 +899,12 @@ befs_statfs(struct super_block *sb, stru
 	return 0;
 }
 
-static struct super_block *
+static int
 befs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name,
-	    void *data)
+	    void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, befs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type befs_fs_type = {
diff -puN fs/bfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/bfs/inode.c
--- a/fs/bfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/bfs/inode.c
@@ -410,10 +410,10 @@ out:
 	return -EINVAL;
 }
 
-static struct super_block *bfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int bfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, bfs_fill_super, mnt);
 }
 
 static struct file_system_type bfs_fs_type = {
diff -puN fs/binfmt_misc.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/binfmt_misc.c
--- a/fs/binfmt_misc.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/binfmt_misc.c
@@ -739,10 +739,10 @@ static int bm_fill_super(struct super_bl
 	return err;
 }
 
-static struct super_block *bm_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int bm_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, bm_fill_super);
+	return get_sb_single(fs_type, flags, data, bm_fill_super, mnt);
 }
 
 static struct linux_binfmt misc_format = {
diff -puN fs/block_dev.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/block_dev.c
--- a/fs/block_dev.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/block_dev.c
@@ -300,10 +300,10 @@ static struct super_operations bdev_sops
 	.clear_inode = bdev_clear_inode,
 };
 
-static struct super_block *bd_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int bd_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "bdev:", &bdev_sops, 0x62646576);
+	return get_sb_pseudo(fs_type, "bdev:", &bdev_sops, 0x62646576, mnt);
 }
 
 static struct file_system_type bd_type = {
diff -puN fs/cifs/cifsfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/cifs/cifsfs.c
--- a/fs/cifs/cifsfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/cifs/cifsfs.c
@@ -460,9 +460,9 @@ struct super_operations cifs_super_ops =
 	.remount_fs = cifs_remount,
 };
 
-static struct super_block *
+static int
 cifs_get_sb(struct file_system_type *fs_type,
-	    int flags, const char *dev_name, void *data)
+	    int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
 	int rc;
 	struct super_block *sb = sget(fs_type, NULL, set_anon_super, NULL);
@@ -470,7 +470,7 @@ cifs_get_sb(struct file_system_type *fs_
 	cFYI(1, ("Devname: %s flags: %d ", dev_name, flags));
 
 	if (IS_ERR(sb))
-		return sb;
+		return PTR_ERR(sb);
 
 	sb->s_flags = flags;
 
@@ -478,10 +478,10 @@ cifs_get_sb(struct file_system_type *fs_
 	if (rc) {
 		up_write(&sb->s_umount);
 		deactivate_super(sb);
-		return ERR_PTR(rc);
+		return rc;
 	}
 	sb->s_flags |= MS_ACTIVE;
-	return sb;
+	return simple_set_mnt(mnt, sb);
 }
 
 static ssize_t cifs_file_writev(struct file *file, const struct iovec *iov,
diff -puN fs/coda/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/coda/inode.c
--- a/fs/coda/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/coda/inode.c
@@ -307,10 +307,10 @@ static int coda_statfs(struct super_bloc
 
 /* init_coda: used by filesystems.c to register coda */
 
-static struct super_block *coda_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int coda_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, coda_fill_super);
+	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
 }
 
 struct file_system_type coda_fs_type = {
diff -puN fs/configfs/mount.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/configfs/mount.c
--- a/fs/configfs/mount.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/configfs/mount.c
@@ -103,10 +103,10 @@ static int configfs_fill_super(struct su
 	return 0;
 }
 
-static struct super_block *configfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int configfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, configfs_fill_super);
+	return get_sb_single(fs_type, flags, data, configfs_fill_super, mnt);
 }
 
 static struct file_system_type configfs_fs_type = {
diff -puN fs/cramfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/cramfs/inode.c
--- a/fs/cramfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/cramfs/inode.c
@@ -528,10 +528,11 @@ static struct super_operations cramfs_op
 	.statfs		= cramfs_statfs,
 };
 
-static struct super_block *cramfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int cramfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, cramfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type cramfs_fs_type = {
diff -puN fs/dcache.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/dcache.c
--- a/fs/dcache.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/dcache.c
@@ -687,46 +687,6 @@ void shrink_dcache_parent(struct dentry 
 		prune_dcache(found, parent->d_sb);
 }
 
-/**
- * shrink_dcache_anon - further prune the cache
- * @head: head of d_hash list of dentries to prune
- *
- * Prune the dentries that are anonymous
- *
- * parsing d_hash list does not hlist_for_each_entry_rcu() as it
- * done under dcache_lock.
- *
- */
-void shrink_dcache_anon(struct super_block *sb)
-{
-	struct hlist_node *lp;
-	struct hlist_head *head = &sb->s_anon;
-	int found;
-	do {
-		found = 0;
-		spin_lock(&dcache_lock);
-		hlist_for_each(lp, head) {
-			struct dentry *this = hlist_entry(lp, struct dentry, d_hash);
-			if (!list_empty(&this->d_lru)) {
-				dentry_stat.nr_unused--;
-				list_del_init(&this->d_lru);
-			}
-
-			/* 
-			 * move only zero ref count dentries to the end 
-			 * of the unused list for prune_dcache
-			 */
-			if (!atomic_read(&this->d_count)) {
-				list_add_tail(&this->d_lru, &dentry_unused);
-				dentry_stat.nr_unused++;
-				found++;
-			}
-		}
-		spin_unlock(&dcache_lock);
-		prune_dcache(found, sb);
-	} while(found);
-}
-
 /*
  * Scan `nr' dentries and return the number which remain.
  *
diff -puN fs/debugfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/debugfs/inode.c
--- a/fs/debugfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/debugfs/inode.c
@@ -111,11 +111,11 @@ static int debug_fill_super(struct super
 	return simple_fill_super(sb, DEBUGFS_MAGIC, debug_files);
 }
 
-static struct super_block *debug_get_sb(struct file_system_type *fs_type,
-				        int flags, const char *dev_name,
-					void *data)
+static int debug_get_sb(struct file_system_type *fs_type,
+			int flags, const char *dev_name,
+			void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, debug_fill_super);
+	return get_sb_single(fs_type, flags, data, debug_fill_super, mnt);
 }
 
 static struct file_system_type debug_fs_type = {
diff -puN fs/devfs/base.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/devfs/base.c
--- a/fs/devfs/base.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/devfs/base.c
@@ -2549,11 +2549,11 @@ static int devfs_fill_super(struct super
 	return -EINVAL;
 }				/*  End Function devfs_fill_super  */
 
-static struct super_block *devfs_get_sb(struct file_system_type *fs_type,
-					int flags, const char *dev_name,
-					void *data)
+static int devfs_get_sb(struct file_system_type *fs_type,
+			int flags, const char *dev_name,
+			void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, devfs_fill_super);
+	return get_sb_single(fs_type, flags, data, devfs_fill_super, mnt);
 }
 
 static struct file_system_type devfs_fs_type = {
diff -puN fs/devpts/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/devpts/inode.c
--- a/fs/devpts/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/devpts/inode.c
@@ -130,10 +130,10 @@ fail:
 	return -ENOMEM;
 }
 
-static struct super_block *devpts_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int devpts_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, devpts_fill_super);
+	return get_sb_single(fs_type, flags, data, devpts_fill_super, mnt);
 }
 
 static struct file_system_type devpts_fs_type = {
diff -puN fs/efs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/efs/super.c
--- a/fs/efs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/efs/super.c
@@ -18,10 +18,10 @@
 static int efs_statfs(struct super_block *s, struct kstatfs *buf);
 static int efs_fill_super(struct super_block *s, void *d, int silent);
 
-static struct super_block *efs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int efs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, efs_fill_super, mnt);
 }
 
 static struct file_system_type efs_fs_type = {
diff -puN fs/eventpoll.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/eventpoll.c
--- a/fs/eventpoll.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/eventpoll.c
@@ -268,9 +268,9 @@ static int ep_poll(struct eventpoll *ep,
 		   int maxevents, long timeout);
 static int eventpollfs_delete_dentry(struct dentry *dentry);
 static struct inode *ep_eventpoll_inode(void);
-static struct super_block *eventpollfs_get_sb(struct file_system_type *fs_type,
-					      int flags, const char *dev_name,
-					      void *data);
+static int eventpollfs_get_sb(struct file_system_type *fs_type,
+			      int flags, const char *dev_name,
+			      void *data, struct vfsmount *mnt);
 
 /*
  * This semaphore is used to serialize ep_free() and eventpoll_release_file().
@@ -1595,11 +1595,12 @@ eexit_1:
 }
 
 
-static struct super_block *
+static int
 eventpollfs_get_sb(struct file_system_type *fs_type, int flags,
-		   const char *dev_name, void *data)
+		   const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "eventpoll:", NULL, EVENTPOLLFS_MAGIC);
+	return get_sb_pseudo(fs_type, "eventpoll:", NULL, EVENTPOLLFS_MAGIC,
+			     mnt);
 }
 
 
diff -puN fs/ext2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ext2/super.c
--- a/fs/ext2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ext2/super.c
@@ -1087,10 +1087,10 @@ static int ext2_statfs (struct super_blo
 	return 0;
 }
 
-static struct super_block *ext2_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int ext2_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt);
 }
 
 #ifdef CONFIG_QUOTA
diff -puN fs/ext3/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ext3/super.c
--- a/fs/ext3/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ext3/super.c
@@ -2646,10 +2646,10 @@ out:
 
 #endif
 
-static struct super_block *ext3_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int ext3_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, ext3_fill_super, mnt);
 }
 
 static struct file_system_type ext3_fs_type = {
diff -puN fs/freevxfs/vxfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/freevxfs/vxfs_super.c
--- a/fs/freevxfs/vxfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/freevxfs/vxfs_super.c
@@ -241,10 +241,11 @@ out:
 /*
  * The usual module blurb.
  */
-static struct super_block *vxfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int vxfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, vxfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type vxfs_fs_type = {
diff -puN fs/fuse/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/fuse/inode.c
--- a/fs/fuse/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/fuse/inode.c
@@ -569,11 +569,11 @@ static int fuse_fill_super(struct super_
 	return err;
 }
 
-static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
-				       int flags, const char *dev_name,
-				       void *raw_data)
+static int fuse_get_sb(struct file_system_type *fs_type,
+		       int flags, const char *dev_name,
+		       void *raw_data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
+	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
 }
 
 static struct file_system_type fuse_fs_type = {
diff -puN fs/hfsplus/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hfsplus/super.c
--- a/fs/hfsplus/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hfsplus/super.c
@@ -450,10 +450,12 @@ static void hfsplus_destroy_inode(struct
 
 #define HFSPLUS_INODE_SIZE	sizeof(struct hfsplus_inode_info)
 
-static struct super_block *hfsplus_get_sb(struct file_system_type *fs_type,
-					  int flags, const char *dev_name, void *data)
+static int hfsplus_get_sb(struct file_system_type *fs_type,
+			  int flags, const char *dev_name, void *data,
+			  struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, hfsplus_fill_super,
+			   mnt);
 }
 
 static struct file_system_type hfsplus_fs_type = {
diff -puN fs/hfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hfs/super.c
--- a/fs/hfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hfs/super.c
@@ -413,10 +413,11 @@ bail:
 	return res;
 }
 
-static struct super_block *hfs_get_sb(struct file_system_type *fs_type,
-				      int flags, const char *dev_name, void *data)
+static int hfs_get_sb(struct file_system_type *fs_type,
+		      int flags, const char *dev_name, void *data,
+		      struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, hfs_fill_super, mnt);
 }
 
 static struct file_system_type hfs_fs_type = {
diff -puN fs/hostfs/hostfs_kern.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hostfs/hostfs_kern.c
--- a/fs/hostfs/hostfs_kern.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hostfs/hostfs_kern.c
@@ -993,11 +993,11 @@ static int hostfs_fill_sb_common(struct 
 	return(err);
 }
 
-static struct super_block *hostfs_read_sb(struct file_system_type *type,
-					     int flags, const char *dev_name,
-					     void *data)
+static int hostfs_read_sb(struct file_system_type *type,
+			  int flags, const char *dev_name,
+			  void *data, struct vfsmount *mnt)
 {
-	return(get_sb_nodev(type, flags, data, hostfs_fill_sb_common));
+	return get_sb_nodev(type, flags, data, hostfs_fill_sb_common, mnt);
 }
 
 static struct file_system_type hostfs_type = {
diff -puN fs/hpfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hpfs/super.c
--- a/fs/hpfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hpfs/super.c
@@ -662,10 +662,11 @@ bail0:
 	return -EINVAL;
 }
 
-static struct super_block *hpfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int hpfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type hpfs_fs_type = {
diff -puN fs/hppfs/hppfs_kern.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hppfs/hppfs_kern.c
--- a/fs/hppfs/hppfs_kern.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hppfs/hppfs_kern.c
@@ -769,11 +769,11 @@ static int hppfs_fill_super(struct super
 	return(err);
 }
 
-static struct super_block *hppfs_read_super(struct file_system_type *type,
-					     int flags, const char *dev_name,
-					     void *data)
+static int hppfs_read_super(struct file_system_type *type,
+			    int flags, const char *dev_name,
+			    void *data, struct vfsmount *mnt)
 {
-	return(get_sb_nodev(type, flags, data, hppfs_fill_super));
+	return get_sb_nodev(type, flags, data, hppfs_fill_super, mnt);
 }
 
 static struct file_system_type hppfs_type = {
diff -puN fs/hugetlbfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/hugetlbfs/inode.c
@@ -723,10 +723,10 @@ void hugetlb_put_quota(struct address_sp
 	}
 }
 
-static struct super_block *hugetlbfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int hugetlbfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super);
+	return get_sb_nodev(fs_type, flags, data, hugetlbfs_fill_super, mnt);
 }
 
 static struct file_system_type hugetlbfs_fs_type = {
diff -puN fs/inotify_user.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/inotify_user.c
--- a/fs/inotify_user.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/inotify_user.c
@@ -672,11 +672,11 @@ out:
 	return ret;
 }
 
-static struct super_block *
+static int
 inotify_get_sb(struct file_system_type *fs_type, int flags,
-	       const char *dev_name, void *data)
+	       const char *dev_name, void *data, struct vfsmount *mnt)
 {
-    return get_sb_pseudo(fs_type, "inotify", NULL, 0xBAD1DEA);
+	return get_sb_pseudo(fs_type, "inotify", NULL, 0xBAD1DEA, mnt);
 }
 
 static struct file_system_type inotify_fs_type = {
diff -puN fs/isofs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/isofs/inode.c
--- a/fs/isofs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/isofs/inode.c
@@ -1399,10 +1399,11 @@ struct inode *isofs_iget(struct super_bl
 	return inode;
 }
 
-static struct super_block *isofs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int isofs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, isofs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type iso9660_fs_type = {
diff -puN fs/jffs2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/jffs2/super.c
--- a/fs/jffs2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/jffs2/super.c
@@ -111,9 +111,10 @@ static int jffs2_sb_set(struct super_blo
 	return 0;
 }
 
-static struct super_block *jffs2_get_sb_mtd(struct file_system_type *fs_type,
-					      int flags, const char *dev_name,
-					      void *data, struct mtd_info *mtd)
+static int jffs2_get_sb_mtd(struct file_system_type *fs_type,
+			    int flags, const char *dev_name,
+			    void *data, struct mtd_info *mtd,
+			    struct vfsmount *mnt)
 {
 	struct super_block *sb;
 	struct jffs2_sb_info *c;
@@ -121,19 +122,20 @@ static struct super_block *jffs2_get_sb_
 
 	c = kmalloc(sizeof(*c), GFP_KERNEL);
 	if (!c)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	memset(c, 0, sizeof(*c));
 	c->mtd = mtd;
 
 	sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c);
 
 	if (IS_ERR(sb))
-		goto out_put;
+		goto out_error;
 
 	if (sb->s_root) {
 		/* New mountpoint for JFFS2 which is already mounted */
 		D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n",
 			  mtd->index, mtd->name));
+		ret = simple_set_mnt(mnt, sb);
 		goto out_put;
 	}
 
@@ -161,44 +163,47 @@ static struct super_block *jffs2_get_sb_
 		/* Failure case... */
 		up_write(&sb->s_umount);
 		deactivate_super(sb);
-		return ERR_PTR(ret);
+		return ret;
 	}
 
 	sb->s_flags |= MS_ACTIVE;
-	return sb;
+	return simple_set_mnt(mnt, sb);
 
+out_error:
+	ret = PTR_ERR(sb);
  out_put:
 	kfree(c);
 	put_mtd_device(mtd);
 
-	return sb;
+	return ret;
 }
 
-static struct super_block *jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
-					      int flags, const char *dev_name,
-					      void *data, int mtdnr)
+static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type,
+			      int flags, const char *dev_name,
+			      void *data, int mtdnr,
+			      struct vfsmount *mnt)
 {
 	struct mtd_info *mtd;
 
 	mtd = get_mtd_device(NULL, mtdnr);
 	if (!mtd) {
 		D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr));
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 	}
 
-	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
+	return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
 }
 
-static struct super_block *jffs2_get_sb(struct file_system_type *fs_type,
-					int flags, const char *dev_name,
-					void *data)
+static int jffs2_get_sb(struct file_system_type *fs_type,
+			int flags, const char *dev_name,
+			void *data, struct vfsmount *mnt)
 {
 	int err;
 	struct nameidata nd;
 	int mtdnr;
 
 	if (!dev_name)
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 
 	D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name));
 
@@ -220,7 +225,7 @@ static struct super_block *jffs2_get_sb(
 				mtd = get_mtd_device(NULL, mtdnr);
 				if (mtd) {
 					if (!strcmp(mtd->name, dev_name+4))
-						return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd);
+						return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt);
 					put_mtd_device(mtd);
 				}
 			}
@@ -233,7 +238,7 @@ static struct super_block *jffs2_get_sb(
 			if (!*endptr) {
 				/* It was a valid number */
 				D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr));
-				return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
+				return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
 			}
 		}
 	}
@@ -247,7 +252,7 @@ static struct super_block *jffs2_get_sb(
 		  err, nd.dentry->d_inode));
 
 	if (err)
-		return ERR_PTR(err);
+		return err;
 
 	err = -EINVAL;
 
@@ -269,11 +274,11 @@ static struct super_block *jffs2_get_sb(
 	mtdnr = iminor(nd.dentry->d_inode);
 	path_release(&nd);
 
-	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr);
+	return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt);
 
 out:
 	path_release(&nd);
-	return ERR_PTR(err);
+	return err;
 }
 
 static void jffs2_put_super (struct super_block *sb)
diff -puN fs/jffs/inode-v23.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/jffs/inode-v23.c
--- a/fs/jffs/inode-v23.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/jffs/inode-v23.c
@@ -1785,10 +1785,11 @@ static struct super_operations jffs_ops 
 	.remount_fs	= jffs_remount,
 };
 
-static struct super_block *jffs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int jffs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, jffs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, jffs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type jffs_fs_type = {
diff -puN fs/jfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/jfs/super.c
--- a/fs/jfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/jfs/super.c
@@ -565,10 +565,11 @@ static void jfs_unlockfs(struct super_bl
 	}
 }
 
-static struct super_block *jfs_get_sb(struct file_system_type *fs_type, 
-	int flags, const char *dev_name, void *data)
+static int jfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, jfs_fill_super,
+			   mnt);
 }
 
 static int jfs_sync_fs(struct super_block *sb, int wait)
diff -puN fs/libfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/libfs.c
--- a/fs/libfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/libfs.c
@@ -196,9 +196,9 @@ struct inode_operations simple_dir_inode
  * Common helper for pseudo-filesystems (sockfs, pipefs, bdev - stuff that
  * will never be mountable)
  */
-struct super_block *
-get_sb_pseudo(struct file_system_type *fs_type, char *name,
-	struct super_operations *ops, unsigned long magic)
+int get_sb_pseudo(struct file_system_type *fs_type, char *name,
+	struct super_operations *ops, unsigned long magic,
+	struct vfsmount *mnt)
 {
 	struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
 	static struct super_operations default_ops = {.statfs = simple_statfs};
@@ -207,7 +207,7 @@ get_sb_pseudo(struct file_system_type *f
 	struct qstr d_name = {.name = name, .len = strlen(name)};
 
 	if (IS_ERR(s))
-		return s;
+		return PTR_ERR(s);
 
 	s->s_flags = MS_NOUSER;
 	s->s_maxbytes = ~0ULL;
@@ -232,12 +232,12 @@ get_sb_pseudo(struct file_system_type *f
 	d_instantiate(dentry, root);
 	s->s_root = dentry;
 	s->s_flags |= MS_ACTIVE;
-	return s;
+	return simple_set_mnt(mnt, s);
 
 Enomem:
 	up_write(&s->s_umount);
 	deactivate_super(s);
-	return ERR_PTR(-ENOMEM);
+	return -ENOMEM;
 }
 
 int simple_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry)
diff -puN fs/minix/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/minix/inode.c
--- a/fs/minix/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/minix/inode.c
@@ -559,10 +559,11 @@ void minix_truncate(struct inode * inode
 		V2_minix_truncate(inode);
 }
 
-static struct super_block *minix_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int minix_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, minix_fill_super,
+			   mnt);
 }
 
 static struct file_system_type minix_fs_type = {
diff -puN fs/msdos/namei.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/msdos/namei.c
--- a/fs/msdos/namei.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/msdos/namei.c
@@ -661,11 +661,12 @@ static int msdos_fill_super(struct super
 	return 0;
 }
 
-static struct super_block *msdos_get_sb(struct file_system_type *fs_type,
-					int flags, const char *dev_name,
-					void *data)
+static int msdos_get_sb(struct file_system_type *fs_type,
+			int flags, const char *dev_name,
+			void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, msdos_fill_super,
+			   mnt);
 }
 
 static struct file_system_type msdos_fs_type = {
diff -puN fs/namespace.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/namespace.c
--- a/fs/namespace.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/namespace.c
@@ -86,6 +86,15 @@ struct vfsmount *alloc_vfsmnt(const char
 	return mnt;
 }
 
+int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb)
+{
+	mnt->mnt_sb = sb;
+	mnt->mnt_root = dget(sb->s_root);
+	return 0;
+}
+
+EXPORT_SYMBOL(simple_set_mnt);
+
 void free_vfsmnt(struct vfsmount *mnt)
 {
 	kfree(mnt->mnt_devname);
diff -puN fs/ncpfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ncpfs/inode.c
--- a/fs/ncpfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ncpfs/inode.c
@@ -957,10 +957,10 @@ out:
 	return result;
 }
 
-static struct super_block *ncp_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int ncp_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, ncp_fill_super);
+	return get_sb_nodev(fs_type, flags, data, ncp_fill_super, mnt);
 }
 
 static struct file_system_type ncp_fs_type = {
diff -puN fs/nfsd/nfsctl.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/nfsd/nfsctl.c
--- a/fs/nfsd/nfsctl.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/nfsd/nfsctl.c
@@ -494,10 +494,10 @@ static int nfsd_fill_super(struct super_
 	return simple_fill_super(sb, 0x6e667364, nfsd_files);
 }
 
-static struct super_block *nfsd_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int nfsd_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, nfsd_fill_super);
+	return get_sb_single(fs_type, flags, data, nfsd_fill_super, mnt);
 }
 
 static struct file_system_type nfsd_fs_type = {
diff -puN fs/nfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/nfs/inode.c
--- a/fs/nfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/nfs/inode.c
@@ -1690,8 +1690,8 @@ static int nfs_compare_super(struct supe
 	return !nfs_compare_fh(&old->fh, &server->fh);
 }
 
-static struct super_block *nfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *raw_data)
+static int nfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
 {
 	int error;
 	struct nfs_server *server = NULL;
@@ -1699,14 +1699,14 @@ static struct super_block *nfs_get_sb(st
 	struct nfs_fh *root;
 	struct nfs_mount_data *data = raw_data;
 
-	s = ERR_PTR(-EINVAL);
+	error = -EINVAL;
 	if (data == NULL) {
 		dprintk("%s: missing data argument\n", __FUNCTION__);
-		goto out_err;
+		goto out_err_noserver;
 	}
 	if (data->version <= 0 || data->version > NFS_MOUNT_VERSION) {
 		dprintk("%s: bad mount version\n", __FUNCTION__);
-		goto out_err;
+		goto out_err_noserver;
 	}
 	switch (data->version) {
 		case 1:
@@ -1718,7 +1718,7 @@ static struct super_block *nfs_get_sb(st
 				dprintk("%s: mount structure version %d does not support NFSv3\n",
 						__FUNCTION__,
 						data->version);
-				goto out_err;
+				goto out_err_noserver;
 			}
 			data->root.size = NFS2_FHSIZE;
 			memcpy(data->root.data, data->old_root.data, NFS2_FHSIZE);
@@ -1727,24 +1727,24 @@ static struct super_block *nfs_get_sb(st
 				dprintk("%s: mount structure version %d does not support strong security\n",
 						__FUNCTION__,
 						data->version);
-				goto out_err;
+				goto out_err_noserver;
 			}
 		case 5:
 			memset(data->context, 0, sizeof(data->context));
 	}
 #ifndef CONFIG_NFS_V3
 	/* If NFSv3 is not compiled in, return -EPROTONOSUPPORT */
-	s = ERR_PTR(-EPROTONOSUPPORT);
+	error = -EPROTONOSUPPORT;
 	if (data->flags & NFS_MOUNT_VER3) {
 		dprintk("%s: NFSv3 not compiled into kernel\n", __FUNCTION__);
-		goto out_err;
+		goto out_err_noserver;
 	}
 #endif /* CONFIG_NFS_V3 */
 
-	s = ERR_PTR(-ENOMEM);
+	error = -ENOMEM;
 	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 	if (!server)
-		goto out_err;
+		goto out_err_noserver;
 	/* Zero out the NFS state stuff */
 	init_nfsv4_state(server);
 	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
@@ -1754,7 +1754,7 @@ static struct super_block *nfs_get_sb(st
 		root->size = data->root.size;
 	else
 		root->size = NFS2_FHSIZE;
-	s = ERR_PTR(-EINVAL);
+	error = -EINVAL;
 	if (root->size > sizeof(root->data)) {
 		dprintk("%s: invalid root filehandle\n", __FUNCTION__);
 		goto out_err;
@@ -1770,15 +1770,20 @@ static struct super_block *nfs_get_sb(st
 	}
 
 	/* Fire up rpciod if not yet running */
-	s = ERR_PTR(rpciod_up());
-	if (IS_ERR(s)) {
-		dprintk("%s: couldn't start rpciod! Error = %ld\n",
-				__FUNCTION__, PTR_ERR(s));
+	error = rpciod_up();
+	if (error < 0) {
+		dprintk("%s: couldn't start rpciod! Error = %d\n",
+				__FUNCTION__, error);
 		goto out_err;
 	}
 
 	s = sget(fs_type, nfs_compare_super, nfs_set_super, server);
-	if (IS_ERR(s) || s->s_root)
+	if (IS_ERR(s)) {
+		error = PTR_ERR(s);
+		goto out_err_rpciod;
+	}
+
+	if (s->s_root)
 		goto out_rpciod_down;
 
 	s->s_flags = flags;
@@ -1787,15 +1792,22 @@ static struct super_block *nfs_get_sb(st
 	if (error) {
 		up_write(&s->s_umount);
 		deactivate_super(s);
-		return ERR_PTR(error);
+		return error;
 	}
 	s->s_flags |= MS_ACTIVE;
-	return s;
+	return simple_set_mnt(mnt, s);
+
 out_rpciod_down:
 	rpciod_down();
+	kfree(server);
+	return simple_set_mnt(mnt, s);
+
+out_err_rpciod:
+	rpciod_down();
 out_err:
 	kfree(server);
-	return s;
+out_err_noserver:
+	return error;
 }
 
 static void nfs_kill_super(struct super_block *s)
@@ -2032,8 +2044,8 @@ nfs_copy_user_string(char *dst, struct n
 	return dst;
 }
 
-static struct super_block *nfs4_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *raw_data)
+static int nfs4_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *raw_data, struct vfsmount *mnt)
 {
 	int error;
 	struct nfs_server *server;
@@ -2043,16 +2055,16 @@ static struct super_block *nfs4_get_sb(s
 
 	if (data == NULL) {
 		dprintk("%s: missing data argument\n", __FUNCTION__);
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 	}
 	if (data->version <= 0 || data->version > NFS4_MOUNT_VERSION) {
 		dprintk("%s: bad mount version\n", __FUNCTION__);
-		return ERR_PTR(-EINVAL);
+		return -EINVAL;
 	}
 
 	server = kzalloc(sizeof(struct nfs_server), GFP_KERNEL);
 	if (!server)
-		return ERR_PTR(-ENOMEM);
+		return -ENOMEM;
 	/* Zero out the NFS state stuff */
 	init_nfsv4_state(server);
 	server->client = server->client_sys = server->client_acl = ERR_PTR(-EINVAL);
@@ -2074,33 +2086,41 @@ static struct super_block *nfs4_get_sb(s
 
 	/* We now require that the mount process passes the remote address */
 	if (data->host_addrlen != sizeof(server->addr)) {
-		s = ERR_PTR(-EINVAL);
+		error = -EINVAL;
 		goto out_free;
 	}
 	if (copy_from_user(&server->addr, data->host_addr, sizeof(server->addr))) {
-		s = ERR_PTR(-EFAULT);
+		error = -EFAULT;
 		goto out_free;
 	}
 	if (server->addr.sin_family != AF_INET ||
 	    server->addr.sin_addr.s_addr == INADDR_ANY) {
 		dprintk("%s: mount program didn't pass remote IP address!\n",
 				__FUNCTION__);
-		s = ERR_PTR(-EINVAL);
+		error = -EINVAL;
 		goto out_free;
 	}
 
 	/* Fire up rpciod if not yet running */
-	s = ERR_PTR(rpciod_up());
-	if (IS_ERR(s)) {
-		dprintk("%s: couldn't start rpciod! Error = %ld\n",
-				__FUNCTION__, PTR_ERR(s));
+	error = rpciod_up();
+	if (error < 0) {
+		dprintk("%s: couldn't start rpciod! Error = %d\n",
+				__FUNCTION__, error);
 		goto out_free;
 	}
 
 	s = sget(fs_type, nfs4_compare_super, nfs_set_super, server);
-
-	if (IS_ERR(s) || s->s_root)
+	if (IS_ERR(s)) {
+		error = PTR_ERR(s);
 		goto out_free;
+	}
+
+	if (s->s_root) {
+		kfree(server->mnt_path);
+		kfree(server->hostname);
+		kfree(server);
+		return simple_set_mnt(mnt, s);
+	}
 
 	s->s_flags = flags;
 
@@ -2108,17 +2128,17 @@ static struct super_block *nfs4_get_sb(s
 	if (error) {
 		up_write(&s->s_umount);
 		deactivate_super(s);
-		return ERR_PTR(error);
+		return error;
 	}
 	s->s_flags |= MS_ACTIVE;
-	return s;
+	return simple_set_mnt(mnt, s);
 out_err:
-	s = (struct super_block *)p;
+	error = PTR_ERR(p);
 out_free:
 	kfree(server->mnt_path);
 	kfree(server->hostname);
 	kfree(server);
-	return s;
+	return error;
 }
 
 static void nfs4_kill_super(struct super_block *sb)
diff -puN fs/ntfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ntfs/super.c
--- a/fs/ntfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ntfs/super.c
@@ -3093,10 +3093,11 @@ struct kmem_cache *ntfs_index_ctx_cache;
 /* Driver wide mutex. */
 DEFINE_MUTEX(ntfs_lock);
 
-static struct super_block *ntfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int ntfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, ntfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type ntfs_fs_type = {
diff -puN fs/ocfs2/dlm/dlmfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ocfs2/dlm/dlmfs.c
--- a/fs/ocfs2/dlm/dlmfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ocfs2/dlm/dlmfs.c
@@ -574,10 +574,10 @@ static struct inode_operations dlmfs_fil
 	.getattr	= simple_getattr,
 };
 
-static struct super_block *dlmfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int dlmfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super);
+	return get_sb_nodev(fs_type, flags, data, dlmfs_fill_super, mnt);
 }
 
 static struct file_system_type dlmfs_fs_type = {
diff -puN fs/ocfs2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ocfs2/super.c
--- a/fs/ocfs2/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ocfs2/super.c
@@ -672,12 +672,14 @@ read_super_error:
 	return status;
 }
 
-static struct super_block *ocfs2_get_sb(struct file_system_type *fs_type,
-					int flags,
-					const char *dev_name,
-					void *data)
+static int ocfs2_get_sb(struct file_system_type *fs_type,
+			int flags,
+			const char *dev_name,
+			void *data,
+			struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, ocfs2_fill_super,
+			   mnt);
 }
 
 static struct file_system_type ocfs2_fs_type = {
diff -puN fs/openpromfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/openpromfs/inode.c
--- a/fs/openpromfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/openpromfs/inode.c
@@ -1054,10 +1054,10 @@ out_no_root:
 	return -ENOMEM;
 }
 
-static struct super_block *openprom_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int openprom_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, openprom_fill_super);
+	return get_sb_single(fs_type, flags, data, openprom_fill_super, mnt);
 }
 
 static struct file_system_type openprom_fs_type = {
diff -puN fs/pipe.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/pipe.c
--- a/fs/pipe.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/pipe.c
@@ -979,12 +979,11 @@ no_files:
  * any operations on the root directory. However, we need a non-trivial
  * d_name - pipe: will go nicely and kill the special-casing in procfs.
  */
-
-static struct super_block *
-pipefs_get_sb(struct file_system_type *fs_type, int flags,
-	      const char *dev_name, void *data)
+static int pipefs_get_sb(struct file_system_type *fs_type,
+			 int flags, const char *dev_name, void *data,
+			 struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "pipe:", NULL, PIPEFS_MAGIC);
+	return get_sb_pseudo(fs_type, "pipe:", NULL, PIPEFS_MAGIC, mnt);
 }
 
 static struct file_system_type pipe_fs_type = {
diff -puN fs/proc/root.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/proc/root.c
--- a/fs/proc/root.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/proc/root.c
@@ -26,10 +26,10 @@ struct proc_dir_entry *proc_net, *proc_n
 struct proc_dir_entry *proc_sys_root;
 #endif
 
-static struct super_block *proc_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int proc_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, proc_fill_super);
+	return get_sb_single(fs_type, flags, data, proc_fill_super, mnt);
 }
 
 static struct file_system_type proc_fs_type = {
diff -puN fs/qnx4/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/qnx4/inode.c
--- a/fs/qnx4/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/qnx4/inode.c
@@ -561,10 +561,11 @@ static void destroy_inodecache(void)
 		       "qnx4_inode_cache: not all structures were freed\n");
 }
 
-static struct super_block *qnx4_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int qnx4_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, qnx4_fill_super,
+			   mnt);
 }
 
 static struct file_system_type qnx4_fs_type = {
diff -puN fs/ramfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ramfs/inode.c
--- a/fs/ramfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ramfs/inode.c
@@ -185,16 +185,17 @@ static int ramfs_fill_super(struct super
 	return 0;
 }
 
-struct super_block *ramfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+int ramfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, ramfs_fill_super);
+	return get_sb_nodev(fs_type, flags, data, ramfs_fill_super, mnt);
 }
 
-static struct super_block *rootfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int rootfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super);
+	return get_sb_nodev(fs_type, flags|MS_NOUSER, data, ramfs_fill_super,
+			    mnt);
 }
 
 static struct file_system_type ramfs_fs_type = {
diff -puN fs/reiserfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/reiserfs/super.c
--- a/fs/reiserfs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/reiserfs/super.c
@@ -2249,11 +2249,12 @@ static ssize_t reiserfs_quota_write(stru
 
 #endif
 
-static struct super_block *get_super_block(struct file_system_type *fs_type,
-					   int flags, const char *dev_name,
-					   void *data)
+static int get_super_block(struct file_system_type *fs_type,
+			   int flags, const char *dev_name,
+			   void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, reiserfs_fill_super,
+			   mnt);
 }
 
 static int __init init_reiserfs_fs(void)
diff -puN fs/romfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/romfs/inode.c
--- a/fs/romfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/romfs/inode.c
@@ -607,10 +607,11 @@ static struct super_operations romfs_ops
 	.remount_fs	= romfs_remount,
 };
 
-static struct super_block *romfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int romfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, romfs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, romfs_fill_super,
+			   mnt);
 }
 
 static struct file_system_type romfs_fs_type = {
diff -puN fs/smbfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/smbfs/inode.c
--- a/fs/smbfs/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/smbfs/inode.c
@@ -782,10 +782,10 @@ out:
 	return error;
 }
 
-static struct super_block *smb_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int smb_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, smb_fill_super);
+	return get_sb_nodev(fs_type, flags, data, smb_fill_super, mnt);
 }
 
 static struct file_system_type smb_fs_type = {
diff -puN fs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/super.c
--- a/fs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/super.c
@@ -231,7 +231,7 @@ void generic_shutdown_super(struct super
 	if (root) {
 		sb->s_root = NULL;
 		shrink_dcache_parent(root);
-		shrink_dcache_anon(sb);
+		shrink_dcache_sb(sb);
 		dput(root);
 		fsync_super(sb);
 		lock_super(sb);
@@ -676,9 +676,10 @@ static void bdev_uevent(struct block_dev
 	}
 }
 
-struct super_block *get_sb_bdev(struct file_system_type *fs_type,
+int get_sb_bdev(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data,
-	int (*fill_super)(struct super_block *, void *, int))
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt)
 {
 	struct block_device *bdev;
 	struct super_block *s;
@@ -686,7 +687,7 @@ struct super_block *get_sb_bdev(struct f
 
 	bdev = open_bdev_excl(dev_name, flags, fs_type);
 	if (IS_ERR(bdev))
-		return (struct super_block *)bdev;
+		return PTR_ERR(bdev);
 
 	/*
 	 * once the super is inserted into the list by sget, s_umount
@@ -697,15 +698,17 @@ struct super_block *get_sb_bdev(struct f
 	s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
 	mutex_unlock(&bdev->bd_mount_mutex);
 	if (IS_ERR(s))
-		goto out;
+		goto error_s;
 
 	if (s->s_root) {
 		if ((flags ^ s->s_flags) & MS_RDONLY) {
 			up_write(&s->s_umount);
 			deactivate_super(s);
-			s = ERR_PTR(-EBUSY);
+			error = -EBUSY;
+			goto error_bdev;
 		}
-		goto out;
+
+		close_bdev_excl(bdev);
 	} else {
 		char b[BDEVNAME_SIZE];
 
@@ -716,18 +719,21 @@ struct super_block *get_sb_bdev(struct f
 		if (error) {
 			up_write(&s->s_umount);
 			deactivate_super(s);
-			s = ERR_PTR(error);
-		} else {
-			s->s_flags |= MS_ACTIVE;
-			bdev_uevent(bdev, KOBJ_MOUNT);
+			goto error;
 		}
+
+		s->s_flags |= MS_ACTIVE;
+		bdev_uevent(bdev, KOBJ_MOUNT);
 	}
 
-	return s;
+	return simple_set_mnt(mnt, s);
 
-out:
+error_s:
+	error = PTR_ERR(s);
+error_bdev:
 	close_bdev_excl(bdev);
-	return s;
+error:
+	return error;
 }
 
 EXPORT_SYMBOL(get_sb_bdev);
@@ -744,15 +750,16 @@ void kill_block_super(struct super_block
 
 EXPORT_SYMBOL(kill_block_super);
 
-struct super_block *get_sb_nodev(struct file_system_type *fs_type,
+int get_sb_nodev(struct file_system_type *fs_type,
 	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int))
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt)
 {
 	int error;
 	struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
 
 	if (IS_ERR(s))
-		return s;
+		return PTR_ERR(s);
 
 	s->s_flags = flags;
 
@@ -760,10 +767,10 @@ struct super_block *get_sb_nodev(struct 
 	if (error) {
 		up_write(&s->s_umount);
 		deactivate_super(s);
-		return ERR_PTR(error);
+		return error;
 	}
 	s->s_flags |= MS_ACTIVE;
-	return s;
+	return simple_set_mnt(mnt, s);
 }
 
 EXPORT_SYMBOL(get_sb_nodev);
@@ -773,94 +780,102 @@ static int compare_single(struct super_b
 	return 1;
 }
 
-struct super_block *get_sb_single(struct file_system_type *fs_type,
+int get_sb_single(struct file_system_type *fs_type,
 	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int))
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt)
 {
 	struct super_block *s;
 	int error;
 
 	s = sget(fs_type, compare_single, set_anon_super, NULL);
 	if (IS_ERR(s))
-		return s;
+		return PTR_ERR(s);
 	if (!s->s_root) {
 		s->s_flags = flags;
 		error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
 		if (error) {
 			up_write(&s->s_umount);
 			deactivate_super(s);
-			return ERR_PTR(error);
+			return error;
 		}
 		s->s_flags |= MS_ACTIVE;
 	}
 	do_remount_sb(s, flags, data, 0);
-	return s;
+	return simple_set_mnt(mnt, s);
 }
 
 EXPORT_SYMBOL(get_sb_single);
 
 struct vfsmount *
-do_kern_mount(const char *fstype, int flags, const char *name, void *data)
+vfs_kern_mount(struct file_system_type *type, int flags, const char *name, void *data)
 {
-	struct file_system_type *type = get_fs_type(fstype);
-	struct super_block *sb = ERR_PTR(-ENOMEM);
 	struct vfsmount *mnt;
-	int error;
 	char *secdata = NULL;
+	int error;
 
 	if (!type)
 		return ERR_PTR(-ENODEV);
 
+	error = -ENOMEM;
 	mnt = alloc_vfsmnt(name);
 	if (!mnt)
 		goto out;
 
 	if (data) {
 		secdata = alloc_secdata();
-		if (!secdata) {
-			sb = ERR_PTR(-ENOMEM);
+		if (!secdata)
 			goto out_mnt;
-		}
 
 		error = security_sb_copy_data(type, data, secdata);
-		if (error) {
-			sb = ERR_PTR(error);
+		if (error)
 			goto out_free_secdata;
-		}
 	}
 
-	sb = type->get_sb(type, flags, name, data);
-	if (IS_ERR(sb))
+	error = type->get_sb(type, flags, name, data, mnt);
+	if (error < 0)
 		goto out_free_secdata;
- 	error = security_sb_kern_mount(sb, secdata);
+
+ 	error = security_sb_kern_mount(mnt->mnt_sb, secdata);
  	if (error)
  		goto out_sb;
-	mnt->mnt_sb = sb;
-	mnt->mnt_root = dget(sb->s_root);
-	mnt->mnt_mountpoint = sb->s_root;
+
+	mnt->mnt_mountpoint = mnt->mnt_root;
 	mnt->mnt_parent = mnt;
-	up_write(&sb->s_umount);
+	up_write(&mnt->mnt_sb->s_umount);
 	free_secdata(secdata);
-	put_filesystem(type);
 	return mnt;
 out_sb:
-	up_write(&sb->s_umount);
-	deactivate_super(sb);
-	sb = ERR_PTR(error);
+	dput(mnt->mnt_root);
+	up_write(&mnt->mnt_sb->s_umount);
+	deactivate_super(mnt->mnt_sb);
 out_free_secdata:
 	free_secdata(secdata);
 out_mnt:
 	free_vfsmnt(mnt);
 out:
+	return ERR_PTR(error);
+}
+
+EXPORT_SYMBOL_GPL(vfs_kern_mount);
+
+struct vfsmount *
+do_kern_mount(const char *fstype, int flags, const char *name, void *data)
+{
+	struct file_system_type *type = get_fs_type(fstype);
+	struct vfsmount *mnt;
+	if (!type)
+		return ERR_PTR(-ENODEV);
+	mnt = vfs_kern_mount(type, flags, name, data);
 	put_filesystem(type);
-	return (struct vfsmount *)sb;
+	return mnt;
 }
 
 EXPORT_SYMBOL_GPL(do_kern_mount);
 
 struct vfsmount *kern_mount(struct file_system_type *type)
 {
-	return do_kern_mount(type->name, 0, type->name, NULL);
+	return vfs_kern_mount(type, 0, type->name, NULL);
 }
 
 EXPORT_SYMBOL(kern_mount);
diff -puN fs/sysfs/mount.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/sysfs/mount.c
--- a/fs/sysfs/mount.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/sysfs/mount.c
@@ -66,10 +66,10 @@ static int sysfs_fill_super(struct super
 	return 0;
 }
 
-static struct super_block *sysfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int sysfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, sysfs_fill_super);
+	return get_sb_single(fs_type, flags, data, sysfs_fill_super, mnt);
 }
 
 static struct file_system_type sysfs_fs_type = {
diff -puN fs/sysv/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/sysv/super.c
--- a/fs/sysv/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/sysv/super.c
@@ -506,16 +506,17 @@ failed:
 
 /* Every kernel module contains stuff like this. */
 
-static struct super_block *sysv_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int sysv_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, sysv_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, sysv_fill_super,
+			   mnt);
 }
 
-static struct super_block *v7_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int v7_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, v7_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, v7_fill_super, mnt);
 }
 
 static struct file_system_type sysv_fs_type = {
diff -puN fs/udf/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/udf/super.c
--- a/fs/udf/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/udf/super.c
@@ -94,10 +94,10 @@ static unsigned int udf_count_free(struc
 static int udf_statfs(struct super_block *, struct kstatfs *);
 
 /* UDF filesystem type */
-static struct super_block *udf_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int udf_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt);
 }
 
 static struct file_system_type udf_fstype = {
diff -puN fs/ufs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/ufs/super.c
--- a/fs/ufs/super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/ufs/super.c
@@ -1311,10 +1311,10 @@ out:
 
 #endif
 
-static struct super_block *ufs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int ufs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, ufs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, ufs_fill_super, mnt);
 }
 
 static struct file_system_type ufs_fs_type = {
diff -puN fs/vfat/namei.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/vfat/namei.c
--- a/fs/vfat/namei.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/vfat/namei.c
@@ -1023,11 +1023,12 @@ static int vfat_fill_super(struct super_
 	return 0;
 }
 
-static struct super_block *vfat_get_sb(struct file_system_type *fs_type,
-				       int flags, const char *dev_name,
-				       void *data)
+static int vfat_get_sb(struct file_system_type *fs_type,
+		       int flags, const char *dev_name,
+		       void *data, struct vfsmount *mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, vfat_fill_super,
+			   mnt);
 }
 
 static struct file_system_type vfat_fs_type = {
diff -puN fs/xfs/linux-2.6/xfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount fs/xfs/linux-2.6/xfs_super.c
--- a/fs/xfs/linux-2.6/xfs_super.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/fs/xfs/linux-2.6/xfs_super.c
@@ -853,14 +853,16 @@ fail_vfsop:
 	return -error;
 }
 
-STATIC struct super_block *
+STATIC int
 xfs_fs_get_sb(
 	struct file_system_type	*fs_type,
 	int			flags,
 	const char		*dev_name,
-	void			*data)
+	void			*data,
+	struct vfsmount		*mnt)
 {
-	return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super);
+	return get_sb_bdev(fs_type, flags, dev_name, data, xfs_fs_fill_super,
+			   mnt);
 }
 
 STATIC struct super_operations xfs_super_operations = {
diff -puN include/linux/dcache.h~vfs-permit-filesystem-to-override-root-dentry-on-mount include/linux/dcache.h
--- a/include/linux/dcache.h~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/include/linux/dcache.h
@@ -217,7 +217,6 @@ extern struct dentry * d_alloc_anon(stru
 extern struct dentry * d_splice_alias(struct inode *, struct dentry *);
 extern void shrink_dcache_sb(struct super_block *);
 extern void shrink_dcache_parent(struct dentry *);
-extern void shrink_dcache_anon(struct super_block *);
 extern int d_invalidate(struct dentry *);
 
 /* only used at mount-time */
diff -puN include/linux/fs.h~vfs-permit-filesystem-to-override-root-dentry-on-mount include/linux/fs.h
--- a/include/linux/fs.h~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/include/linux/fs.h
@@ -1269,23 +1269,26 @@ find_exported_dentry(struct super_block 
 struct file_system_type {
 	const char *name;
 	int fs_flags;
-	struct super_block *(*get_sb) (struct file_system_type *, int,
-				       const char *, void *);
+	int (*get_sb) (struct file_system_type *, int,
+		       const char *, void *, struct vfsmount *);
 	void (*kill_sb) (struct super_block *);
 	struct module *owner;
 	struct file_system_type * next;
 	struct list_head fs_supers;
 };
 
-struct super_block *get_sb_bdev(struct file_system_type *fs_type,
+extern int get_sb_bdev(struct file_system_type *fs_type,
 	int flags, const char *dev_name, void *data,
-	int (*fill_super)(struct super_block *, void *, int));
-struct super_block *get_sb_single(struct file_system_type *fs_type,
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt);
+extern int get_sb_single(struct file_system_type *fs_type,
 	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int));
-struct super_block *get_sb_nodev(struct file_system_type *fs_type,
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt);
+extern int get_sb_nodev(struct file_system_type *fs_type,
 	int flags, void *data,
-	int (*fill_super)(struct super_block *, void *, int));
+	int (*fill_super)(struct super_block *, void *, int),
+	struct vfsmount *mnt);
 void generic_shutdown_super(struct super_block *sb);
 void kill_block_super(struct super_block *sb);
 void kill_anon_super(struct super_block *sb);
@@ -1296,8 +1299,10 @@ struct super_block *sget(struct file_sys
 			int (*test)(struct super_block *,void *),
 			int (*set)(struct super_block *,void *),
 			void *data);
-struct super_block *get_sb_pseudo(struct file_system_type *, char *,
-			struct super_operations *ops, unsigned long);
+extern int get_sb_pseudo(struct file_system_type *, char *,
+	struct super_operations *ops, unsigned long,
+	struct vfsmount *mnt);
+extern int simple_set_mnt(struct vfsmount *mnt, struct super_block *sb);
 int __put_super(struct super_block *sb);
 int __put_super_and_need_restart(struct super_block *sb);
 void unnamed_dev_init(void);
diff -puN include/linux/ramfs.h~vfs-permit-filesystem-to-override-root-dentry-on-mount include/linux/ramfs.h
--- a/include/linux/ramfs.h~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/include/linux/ramfs.h
@@ -2,8 +2,8 @@
 #define _LINUX_RAMFS_H
 
 struct inode *ramfs_get_inode(struct super_block *sb, int mode, dev_t dev);
-struct super_block *ramfs_get_sb(struct file_system_type *fs_type,
-	 int flags, const char *dev_name, void *data);
+extern int ramfs_get_sb(struct file_system_type *fs_type,
+	 int flags, const char *dev_name, void *data, struct vfsmount *mnt);
 
 #ifndef CONFIG_MMU
 extern unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
diff -puN ipc/mqueue.c~vfs-permit-filesystem-to-override-root-dentry-on-mount ipc/mqueue.c
--- a/ipc/mqueue.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/ipc/mqueue.c
@@ -205,11 +205,11 @@ static int mqueue_fill_super(struct supe
 	return 0;
 }
 
-static struct super_block *mqueue_get_sb(struct file_system_type *fs_type,
-					 int flags, const char *dev_name,
-					 void *data)
+static int mqueue_get_sb(struct file_system_type *fs_type,
+			 int flags, const char *dev_name,
+			 void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, mqueue_fill_super);
+	return get_sb_single(fs_type, flags, data, mqueue_fill_super, mnt);
 }
 
 static void init_once(void *foo, kmem_cache_t * cachep, unsigned long flags)
diff -puN kernel/cpuset.c~vfs-permit-filesystem-to-override-root-dentry-on-mount kernel/cpuset.c
--- a/kernel/cpuset.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/kernel/cpuset.c
@@ -392,11 +392,11 @@ static int cpuset_fill_super(struct supe
 	return 0;
 }
 
-static struct super_block *cpuset_get_sb(struct file_system_type *fs_type,
-					int flags, const char *unused_dev_name,
-					void *data)
+static int cpuset_get_sb(struct file_system_type *fs_type,
+			 int flags, const char *unused_dev_name,
+			 void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, cpuset_fill_super);
+	return get_sb_single(fs_type, flags, data, cpuset_fill_super, mnt);
 }
 
 static struct file_system_type cpuset_fs_type = {
diff -puN kernel/futex.c~vfs-permit-filesystem-to-override-root-dentry-on-mount kernel/futex.c
--- a/kernel/futex.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/kernel/futex.c
@@ -1056,11 +1056,11 @@ asmlinkage long sys_futex(u32 __user *ua
 			(unsigned long)uaddr2, val2, val3);
 }
 
-static struct super_block *
-futexfs_get_sb(struct file_system_type *fs_type,
-	       int flags, const char *dev_name, void *data)
+static int futexfs_get_sb(struct file_system_type *fs_type,
+			  int flags, const char *dev_name, void *data,
+			  struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "futex", NULL, 0xBAD1DEA);
+	return get_sb_pseudo(fs_type, "futex", NULL, 0xBAD1DEA, mnt);
 }
 
 static struct file_system_type futex_fs_type = {
diff -puN mm/shmem.c~vfs-permit-filesystem-to-override-root-dentry-on-mount mm/shmem.c
--- a/mm/shmem.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/mm/shmem.c
@@ -2233,10 +2233,10 @@ static struct vm_operations_struct shmem
 };
 
 
-static struct super_block *shmem_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int shmem_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, data, shmem_fill_super);
+	return get_sb_nodev(fs_type, flags, data, shmem_fill_super, mnt);
 }
 
 static struct file_system_type tmpfs_fs_type = {
diff -puN net/socket.c~vfs-permit-filesystem-to-override-root-dentry-on-mount net/socket.c
--- a/net/socket.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/net/socket.c
@@ -335,10 +335,11 @@ static struct super_operations sockfs_op
 	.statfs =	simple_statfs,
 };
 
-static struct super_block *sockfs_get_sb(struct file_system_type *fs_type,
-	int flags, const char *dev_name, void *data)
+static int sockfs_get_sb(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC);
+	return get_sb_pseudo(fs_type, "socket:", &sockfs_ops, SOCKFS_MAGIC,
+			     mnt);
 }
 
 static struct vfsmount *sock_mnt __read_mostly;
diff -puN net/sunrpc/rpc_pipe.c~vfs-permit-filesystem-to-override-root-dentry-on-mount net/sunrpc/rpc_pipe.c
--- a/net/sunrpc/rpc_pipe.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/net/sunrpc/rpc_pipe.c
@@ -815,11 +815,11 @@ out:
 	return -ENOMEM;
 }
 
-static struct super_block *
+static int
 rpc_get_sb(struct file_system_type *fs_type,
-		int flags, const char *dev_name, void *data)
+		int flags, const char *dev_name, void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, rpc_fill_super);
+	return get_sb_single(fs_type, flags, data, rpc_fill_super, mnt);
 }
 
 static struct file_system_type rpc_pipe_fs_type = {
diff -puN security/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount security/inode.c
--- a/security/inode.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/security/inode.c
@@ -135,11 +135,11 @@ static int fill_super(struct super_block
 	return simple_fill_super(sb, SECURITYFS_MAGIC, files);
 }
 
-static struct super_block *get_sb(struct file_system_type *fs_type,
-				        int flags, const char *dev_name,
-					void *data)
+static int get_sb(struct file_system_type *fs_type,
+		  int flags, const char *dev_name,
+		  void *data, struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, fill_super);
+	return get_sb_single(fs_type, flags, data, fill_super, mnt);
 }
 
 static struct file_system_type fs_type = {
diff -puN security/selinux/selinuxfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount security/selinux/selinuxfs.c
--- a/security/selinux/selinuxfs.c~vfs-permit-filesystem-to-override-root-dentry-on-mount
+++ a/security/selinux/selinuxfs.c
@@ -1345,10 +1345,11 @@ err:
 	goto out;
 }
 
-static struct super_block *sel_get_sb(struct file_system_type *fs_type,
-				      int flags, const char *dev_name, void *data)
+static int sel_get_sb(struct file_system_type *fs_type,
+		      int flags, const char *dev_name, void *data,
+		      struct vfsmount *mnt)
 {
-	return get_sb_single(fs_type, flags, data, sel_fill_super);
+	return get_sb_single(fs_type, flags, data, sel_fill_super, mnt);
 }
 
 static struct file_system_type sel_fs_type = {
_

Patches currently in -mm which might be from dhowells@xxxxxxxxxx are

selinux-add-hooks-for-key-subsystem.patch
keys-fix-race-between-two-instantiators-of-a-key.patch
fix-dcache-race-during-umount.patch
vfs-permit-filesystem-to-override-root-dentry-on-mount.patch
vfs-permit-filesystem-to-perform-statfs-with-a-known-root-dentry.patch
xfs-use-the-dentry-passed-to-statfs-to-limit-the-scope-of-the-results.patch
git-nfs.patch
git-nfs-build-fixes.patch
nfs-build-fix-99.patch
add-page_mkwrite-vm_operations-method.patch
add-page_mkwrite-vm_operations-method-fix.patch
frv-__user-infrastructure.patch
frv-basic-__iomem-annotations.patch
frv-signal-annotations.patch
frv-sysctl-__user-annotations.patch
frv-binfmt_elf_fdpic-__user-annotations.patch
frv-misc-__user-annotations.patch
frv-misc-sparse-annotations.patch
frv-wrong-syscall.patch
ext2-xip-wont-build-without-mmu.patch
frv-initrd-is-grossly-broken-on-frv-never-built.patch
frv-null-noise-removal-in-frv-xchg.patch
frv-ieee1394-is-borken-on-frv.patch
frv-add-missing-qualifier-to-memcpy_fromio-prototype.patch
frv-trivial-cleanups-in-frv_ksymsc.patch
frv-clean-frv-unistdh.patch
fix-incorrect-sa_onstack-behaviour-for-64-bit-processes.patch
prepare-for-__copy_from_user_inatomic-to-not-zero-missed-bytes.patch
another-couple-of-alterations-to-the-memory-barrier-doc.patch
corrections-to-memory-barrier-doc.patch
net-rxrpc-use-list_move.patch
fs-use-list_move.patch
keys-sort-out-key-quota-system.patch
keys-discard-the-contents-of-a-key-on-revocation.patch
keys-let-keyctl_chown-change-a-keys-owner.patch
keys-allocate-key-serial-numbers-randomly.patch
keys-restrict-contents-of-proc-keys-to-viewable-keys.patch
keys-add-a-way-to-store-the-appropriate-context-for-newly-created-keys.patch
mutex-subsystem-synchro-test-module.patch

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