[PATCH] do shrink_submounts() for all fs types
... and take it out of ->umount_begin() instances. Call with all locks
already taken (by do_umount()) and leave calling release_mounts() to
caller (it will do release_mounts() anyway, so we can just put into
the same list).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/namespace.c b/fs/namespace.c
index 1c78917..7bd74b2 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -581,6 +581,8 @@
}
}
+static void shrink_submounts(struct vfsmount *mnt, struct list_head *umounts);
+
static int do_umount(struct vfsmount *mnt, int flags)
{
struct super_block *sb = mnt->mnt_sb;
@@ -653,6 +655,9 @@
spin_lock(&vfsmount_lock);
event++;
+ if (!(flags & MNT_DETACH))
+ shrink_submounts(mnt, &umount_list);
+
retval = -EBUSY;
if (flags & MNT_DETACH || !propagate_mount_busy(mnt, 2)) {
if (!list_empty(&mnt->mnt_list))
@@ -1302,30 +1307,22 @@
* process a list of expirable mountpoints with the intent of discarding any
* submounts of a specific parent mountpoint
*/
-void shrink_submounts(struct vfsmount *mountpoint, struct list_head *mounts)
+static void shrink_submounts(struct vfsmount *mnt, struct list_head *umounts)
{
LIST_HEAD(graveyard);
- LIST_HEAD(umounts);
- struct vfsmount *mnt;
+ struct vfsmount *m;
- down_write(&namespace_sem);
- spin_lock(&vfsmount_lock);
/* extract submounts of 'mountpoint' from the expiration list */
- while (select_submounts(mountpoint, &graveyard)) {
+ while (select_submounts(mnt, &graveyard)) {
while (!list_empty(&graveyard)) {
- mnt = list_first_entry(&graveyard, struct vfsmount,
+ m = list_first_entry(&graveyard, struct vfsmount,
mnt_expire);
touch_mnt_namespace(mnt->mnt_ns);
- umount_tree(mnt, 1, &umounts);
+ umount_tree(mnt, 1, umounts);
}
}
- spin_unlock(&vfsmount_lock);
- up_write(&namespace_sem);
- release_mounts(&umounts);
}
-EXPORT_SYMBOL_GPL(shrink_submounts);
-
/*
* Some copy_from_user() implementations do not return the exact number of
* bytes remaining to copy on a fault. But copy_mount_options() requires that.