[ 02/12] autofs - remove autofs dentry mount check

From: Greg Kroah-Hartman
Date: Thu May 09 2013 - 18:37:36 EST


3.0-stable review patch. If anyone has any objections, please let me know.

------------------

From: David Jeffery <djeffery@xxxxxxxxxx>

commit ce8a5dbdf9e709bdaf4618d7ef8cceb91e8adc69 upstream.

When checking if an autofs mount point is busy it isn't sufficient to
only check if it's a mount point.

For example, if the mount of an offset mountpoint in a tree is denied
for this host by its export and the dentry becomes a process working
directory the check incorrectly returns the mount as not in use at
expire.

This can happen since the default when mounting within a tree is
nostrict, which means ingnore mount fails on mounts within the tree and
continue. The nostrict option is meant to allow mounting in this case.

Signed-off-by: David Jeffery <djeffery@xxxxxxxxxx>
Signed-off-by: Ian Kent <raven@xxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/autofs4/expire.c | 9 ---------
1 file changed, 9 deletions(-)

--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -61,15 +61,6 @@ static int autofs4_mount_busy(struct vfs
/* This is an autofs submount, we can't expire it */
if (autofs_type_indirect(sbi->type))
goto done;
-
- /*
- * Otherwise it's an offset mount and we need to check
- * if we can umount its mount, if there is one.
- */
- if (!d_mountpoint(path.dentry)) {
- status = 0;
- goto done;
- }
}

/* Update the expiry counter if fs is busy */


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