[PATCH] r/o bind mounts: unlink: monitor i_nlink

When a filesystem decrements i_nlink to zero, it means that a write must be
performed in order to drop the inode from the filesystem.

We're shortly going to have keep filesystems from being remounted r/o between
the time that this i_nlink decrement and that write occurs.

So, add a little helper function to do the decrements.  We'll tie into it in a
bit to note when i_nlink hits zero.

Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Acked-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/fs/autofs/root.c b/fs/autofs/root.c
index 9cac08d6a873..54ad70731927 100644
--- a/fs/autofs/root.c
+++ b/fs/autofs/root.c
@@ -414,7 +414,7 @@ static int autofs_root_rmdir(struct inode *dir, struct dentry *dentry)
 
         dentry->d_time = (unsigned long)(struct autofs_dir_ent *)NULL;
         autofs_hash_delete(ent);
-        dir->i_nlink--;
+        drop_nlink(dir);
         d_drop(dentry);
         unlock_kernel();