In preparation for supporting multiple mounts of sysfs I need to
remove all assumptions that we have a single mount of sysfs.  So this
patch modifies sysfs_open_file to use the vfsmount from the struct
file instead of fibbing and using the global vfsmount.

We get a little more noise this way but we should continue to get the
useful part of the debugging information.

This was the reason I made sysfs_mount static earlier.

Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
---
 fs/sysfs/file.c  |    2 +-
 fs/sysfs/mount.c |    2 +-
 fs/sysfs/sysfs.h |    1 -
 3 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 87e4a0e..ad13151 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -330,7 +330,7 @@ static int sysfs_open_file(struct inode *inode, struct file *file)
 	int error = -EACCES;
 	char *p;
 
-	p = d_path(file->f_dentry, sysfs_mount, last_sysfs_file,
+	p = d_path(file->f_dentry, file->f_vfsmnt, last_sysfs_file,
 		   sizeof(last_sysfs_file));
 	if (p)
 		memmove(last_sysfs_file, p, strlen(p) + 1);
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index a3410d6..7416826 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -22,7 +22,7 @@
 /* Random magic number */
 #define SYSFS_MAGIC 0x62656572
 
-struct vfsmount *sysfs_mount;
+static struct vfsmount *sysfs_mount;
 struct super_block * sysfs_sb = NULL;
 struct kmem_cache *sysfs_dir_cachep;
 
diff --git a/fs/sysfs/sysfs.h b/fs/sysfs/sysfs.h
index 52aaa8c..ff17f8d 100644
--- a/fs/sysfs/sysfs.h
+++ b/fs/sysfs/sysfs.h
@@ -91,7 +91,6 @@ struct sysfs_addrm_cxt {
 extern struct sysfs_dirent sysfs_root;
 extern struct super_block *sysfs_sb;
 extern struct kmem_cache *sysfs_dir_cachep;
-extern struct vfsmount *sysfs_mount;
 
 /*
  * dir.c
-- 
1.5.3.rc6.17.g1911

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