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authorAl Viro <viro@zeniv.linux.org.uk>2014-08-18 23:09:26 +0400
committerAl Viro <viro@zeniv.linux.org.uk>2014-08-31 02:31:41 +0400
commit88b368f27a094277143d8ecd5a056116f6a41520 (patch)
tree70dbec3575942bad615cab61ab9061f2b8228128
parent52addcf9d6669fa439387610bc65c92fa0980cef (diff)
downloadlinux-88b368f27a094277143d8ecd5a056116f6a41520.tar.xz
get rid of propagate_umount() mistakenly treating slaves as busy.
The check in __propagate_umount() ("has somebody explicitly mounted something on that slave?") is done *before* taking the already doomed victims out of the child lists. Cc: stable@vger.kernel.org Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
-rw-r--r--fs/namespace.c4
-rw-r--r--fs/pnode.c1
2 files changed, 4 insertions, 1 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index a01c7730e9af..3273177873f0 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -1253,6 +1253,9 @@ void umount_tree(struct mount *mnt, int how)
hlist_add_head(&p->mnt_hash, &tmp_list);
}
+ hlist_for_each_entry(p, &tmp_list, mnt_hash)
+ list_del_init(&p->mnt_child);
+
if (how)
propagate_umount(&tmp_list);
@@ -1263,7 +1266,6 @@ void umount_tree(struct mount *mnt, int how)
p->mnt_ns = NULL;
if (how < 2)
p->mnt.mnt_flags |= MNT_SYNC_UMOUNT;
- list_del_init(&p->mnt_child);
if (mnt_has_parent(p)) {
put_mountpoint(p->mnt_mp);
/* move the reference to mountpoint into ->mnt_ex_mountpoint */
diff --git a/fs/pnode.c b/fs/pnode.c
index 302bf22c4a30..aae331a5d03b 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -381,6 +381,7 @@ static void __propagate_umount(struct mount *mnt)
* other children
*/
if (child && list_empty(&child->mnt_mounts)) {
+ list_del_init(&child->mnt_child);
hlist_del_init_rcu(&child->mnt_hash);
hlist_add_before_rcu(&child->mnt_hash, &mnt->mnt_hash);
}