author: Nick Piggin <npiggin@kernel.dk> 2010-08-18 04:37:39 +1000
committer: Al Viro <viro@zeniv.linux.org.uk> 2010-08-18 08:35:48 -0400
commit: 99b7db7b8ffd6bb755eb0a175596421a0b581cb2
parent: 6416ccb7899960868f5016751fb81bf25213d24f
Commit Summary:
Diffstat:
1 file changed, 9 insertions, 2 deletions
diff --git a/fs/pnode.c b/fs/pnode.c
index 5cc564a83149..8066b8dd748f 100644
--- a/fs/pnode.c
+++ b/fs/pnode.c
@@ -126,6 +126,9 @@ static int do_make_slave(struct vfsmount *mnt)
return 0;
}
+/*
+ * vfsmount lock must be held for write
+ */
void change_mnt_propagation(struct vfsmount *mnt, int type)
{
if (type == MS_SHARED) {
@@ -270,12 +273,12 @@ int propagate_mnt(struct vfsmount *dest_mnt, struct dentry *dest_dentry,
prev_src_mnt = child;
}
out:
- spin_lock(&vfsmount_lock);
+ br_write_lock(vfsmount_lock);
while (!list_empty(&tmp_list)) {
child = list_first_entry(&tmp_list, struct vfsmount, mnt_hash);
umount_tree(child, 0, &umount_list);
}
- spin_unlock(&vfsmount_lock);
+ br_write_unlock(vfsmount_lock);
release_mounts(&umount_list);
return ret;
}
@@ -296,6 +299,8 @@ static inline int do_refcount_check(struct vfsmount *mnt, int count)
* other mounts its parent propagates to.
* Check if any of these mounts that **do not have submounts**
* have more references than 'refcnt'. If so return busy.
+ *
+ * vfsmount lock must be held for read or write
*/
int propagate_mount_busy(struct vfsmount *mnt, int refcnt)
{
@@ -353,6 +358,8 @@ static void __propagate_umount(struct vfsmount *mnt)
* collect all mounts that receive propagation from the mount in @list,
* and return these additional mounts in the same list.
* @list: the list of mounts to be unmounted.
+ *
+ * vfsmount lock must be held for write
*/
int propagate_umount(struct list_head *list)
{