From: Ian Kent <[email protected]> In some cases when an autofs indirect mount is contained in a file system that is marked as shared (such as when systemd does the equivalent of "mount --make-rshared /" early in the boot), mounts stop expiring.
When this happens the first expiry check on a mountpoint dentry in autofs_expire_indirect() sees a mountpoint dentry with a higher than minimal reference count. Consequently the dentry is condidered busy and the actual expiry check is never done. This particular check was originally meant as an optimisation to detect a path walk in progress but with the addition of rcu-walk it can be ineffective anyway. Removing the test allows automounts to expire again since the actual expire check doesn't rely on the dentry reference count. Signed-off-by: Ian Kent <[email protected]> --- fs/autofs4/expire.c | 5 ----- 1 files changed, 0 insertions(+), 5 deletions(-) diff --git a/fs/autofs4/expire.c b/fs/autofs4/expire.c index 8c0e56d..842d000 100644 --- a/fs/autofs4/expire.c +++ b/fs/autofs4/expire.c @@ -399,11 +399,6 @@ struct dentry *autofs4_expire_indirect(struct super_block *sb, DPRINTK("checking mountpoint %p %.*s", dentry, (int)dentry->d_name.len, dentry->d_name.name); - /* Path walk currently on this dentry? */ - ino_count = atomic_read(&ino->count) + 2; - if (dentry->d_count > ino_count) - goto next; - /* Can we umount this guy */ if (autofs4_mount_busy(mnt, dentry)) goto next; -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
