This is a note to let you know that I've just added the patch titled
autofs - remove autofs dentry mount check
to the 3.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
autofs-remove-autofs-dentry-mount-check.patch
and it can be found in the queue-3.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ce8a5dbdf9e709bdaf4618d7ef8cceb91e8adc69 Mon Sep 17 00:00:00 2001
From: David Jeffery <djeffery@xxxxxxxxxx>
Date: Mon, 6 May 2013 13:49:30 +0800
Subject: autofs - remove autofs dentry mount check
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 */
Patches currently in stable-queue which might be from djeffery@xxxxxxxxxx are
queue-3.9/autofs-remove-autofs-dentry-mount-check.patch
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