diff options
| author | Ian Kent | 2016-11-24 08:03:42 +1100 |
|---|---|---|
| committer | Al Viro | 2016-12-03 20:51:49 -0500 |
| commit | 60359741473438f66fef7297d1fa2435640dbe79 (patch) | |
| tree | 3316c740550e8bd1ddc441385517e28d96e5468e /fs/autofs4/root.c | |
| parent | cfaf86ab6ccdf0acf47ebe474a4a844114bc0e10 (diff) | |
autofs: use path_has_submounts() to fix unreliable have_submount() checks
If an automount mount is clone(2)ed into a file system that is propagation
private, when it later expires in the originating namespace, subsequent
calls to autofs ->d_automount() for that dentry in the original namespace
will return ELOOP until the mount is umounted in the cloned namespace.
Now that a struct path is available where needed use path_has_submounts()
instead of have_submounts() so we don't get false positives when checking
if a dentry is a mount point or contains mounts in the current namespace.
Link: http://lkml.kernel.org/r/20161011053423.27645.91233.stgit@pluto.themaw.net
Signed-off-by: Ian Kent <raven@themaw.net>
Cc: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Cc: Omar Sandoval <osandov@osandov.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/autofs4/root.c')
| -rw-r--r-- | fs/autofs4/root.c | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c index 9355608cb495..ce4e6216a5f0 100644 --- a/fs/autofs4/root.c +++ b/fs/autofs4/root.c @@ -384,16 +384,16 @@ static struct vfsmount *autofs4_d_automount(struct path *path) /* * It's possible that user space hasn't removed directories * after umounting a rootless multi-mount, although it - * should. For v5 have_submounts() is sufficient to handle - * this because the leaves of the directory tree under the - * mount never trigger mounts themselves (they have an autofs - * trigger mount mounted on them). But v4 pseudo direct mounts - * do need the leaves to trigger mounts. In this case we - * have no choice but to use the list_empty() check and + * should. For v5 path_has_submounts() is sufficient to + * handle this because the leaves of the directory tree under + * the mount never trigger mounts themselves (they have an + * autofs trigger mount mounted on them). But v4 pseudo direct + * mounts do need the leaves to trigger mounts. In this case + * we have no choice but to use the list_empty() check and * require user space behave. */ if (sbi->version > 4) { - if (have_submounts(dentry)) { + if (path_has_submounts(path)) { spin_unlock(&sbi->fs_lock); goto done; } |