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get rid of useless vfsmount_lock use in put_mnt_ns()

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It hadn't been needed since we'd sanitized the logics in
mark_mounts_for_expiry() (which, in turn, used to be a
rudiment of bad old times when namespace_sem was per-ns).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-02-05 02:21:06 -05:00
parent 47cd813f29
commit d498b25a4f
1 changed files with 2 additions and 6 deletions
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8
fs/namespace.c
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@ -2344,17 +2344,13 @@ void __init mnt_init(void)
void put_mnt_ns(struct mnt_namespace *ns)
{
struct vfsmount *root;
LIST_HEAD(umount_list);
if (!atomic_dec_and_lock(&ns->count, &vfsmount_lock))
if (!atomic_dec_and_test(&ns->count))
return;
root = ns->root;
ns->root = NULL;
spin_unlock(&vfsmount_lock);
down_write(&namespace_sem);
spin_lock(&vfsmount_lock);
umount_tree(root, 0, &umount_list);
umount_tree(ns->root, 0, &umount_list);
spin_unlock(&vfsmount_lock);
up_write(&namespace_sem);
release_mounts(&umount_list);