author: Eric W. Biederman <ebiederm@xmission.com> 2015-01-03 05:39:35 -0600
committer: Eric W. Biederman <ebiederm@xmission.com> 2015-04-02 20:34:19 -0500
commit: 5d88457eb5b86b475422dc882f089203faaeedb5
parent: 411a938b5abc9cb126c41cccf5975ae464fe0f3e
Commit Summary:
Diffstat:
1 file changed, 18 insertions, 0 deletions
diff --git a/fs/pnode.c b/fs/pnode.c
index c27ae38ee250..89890293dd0a 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -361,6 +361,26 @@ int propagate_mount_busy(struct mount *mnt, int refcnt)
return ret;
}
+/*
+ * Clear MNT_LOCKED when it can be shown to be safe.
+ *
+ * mount_lock lock must be held for write
+ */
+void propagate_mount_unlock(struct mount *mnt)
+{
+ struct mount *parent = mnt->mnt_parent;
+ struct mount *m, *child;
+
+ BUG_ON(parent == mnt);
+
+ for (m = propagation_next(parent, parent); m;
+ m = propagation_next(m, parent)) {
+ child = __lookup_mnt_last(&m->mnt, mnt->mnt_mountpoint);
+ if (child)
+ child->mnt.mnt_flags &= ~MNT_LOCKED;
+ }
+}
+
/*
* NOTE: unmounting 'mnt' naturally propagates to all other mounts its
* parent propagates to.