From: David Jeffery <djeffery@xxxxxxxxxx>
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>
Cc: stable@xxxxxxxxxxxxxxx
---
fs/autofs4/expire.c | 9 ---------
1 file changed, 9 deletions(-)
diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c
index 01443ce..13ddec9 100644
--- a/fs/autofs4/expire.c
+++ b/fs/autofs4/expire.c
@@ -61,15 +61,6 @@ static int autofs4_mount_busy(struct vfsmount *mnt, struct dentry *dentry)
/* 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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