| Message ID | 1428026183-14879-3-git-send-email-ebiederm@xmission.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
diff --git a/fs/namespace.c b/fs/namespace.c index e06e36777b90..c68d9fc912e7 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -1485,7 +1485,7 @@ void __detach_mounts(struct dentry *dentry) lock_mount_hash(); while (!hlist_empty(&mp->m_list)) { mnt = hlist_entry(mp->m_list.first, struct mount, mnt_mp_list); - umount_tree(mnt, UMOUNT_PROPAGATE); + umount_tree(mnt, 0); } unlock_mount_hash(); put_mountpoint(mp);
Invoking mount propagation from __detach_mounts is inefficient and wrong. It is inefficient because __detach_mounts already walks the list of mounts that where something needs to be done, and mount propagation walks some subset of those mounts again. It is actively wrong because if the dentry that is passed to __detach_mounts is not part of the path to a mount that mount should not be affected. change_mnt_propagation(p,MS_PRIVATE) modifies the mount propagation tree of a master mount so it's slaves are connected to another master if possible. Which means even removing a mount from the middle of a mount tree with __detach_mounts will not deprive any mount propagated mount events. Cc: stable@vger.kernel.org Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com> --- fs/namespace.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)