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authorEric W. Biederman <ebiederm@xmission.com>2015-01-03 05:39:35 -0600
committerEric W. Biederman <ebiederm@xmission.com>2015-04-02 20:34:19 -0500
commit5d88457eb5b86b475422dc882f089203faaeedb5 (patch)
tree19d4a52f225092dfa2875dcb073d129151e910cf /fs/namespace.c
parent411a938b5abc9cb126c41cccf5975ae464fe0f3e (diff)
mnt: On an unmount propagate clearing of MNT_LOCKED
A prerequisite of calling umount_tree is that the point where the tree is mounted at is valid to unmount. If we are propagating the effect of the unmount clear MNT_LOCKED in every instance where the same filesystem is mounted on the same mountpoint in the mount tree, as we know (by virtue of the fact that umount_tree was called) that it is safe to reveal what is at that mountpoint. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'fs/namespace.c')
-rw-r--r--fs/namespace.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 083e3401a808..2b12b7a9455d 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1333,6 +1333,9 @@ static void umount_tree(struct mount *mnt, enum umount_tree_flags how)
LIST_HEAD(tmp_list);
struct mount *p;
+ if (how & UMOUNT_PROPAGATE)
+ propagate_mount_unlock(mnt);
+
/* Gather the mounts to umount */
for (p = mnt; p; p = next_mnt(p, mnt)) {
p->mnt.mnt_flags |= MNT_UMOUNT;