From 5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b Mon Sep 17 00:00:00 2001 From: Ram Pai Date: Mon, 7 Nov 2005 17:16:29 -0500 Subject: [PATCH] sanitize the interface of graft_tree(). Old semantics: graft_tree() grabs a reference on the vfsmount before returning success. New one: graft_tree() leaves that to caller. All the callers of graft_tree() immediately dropped that reference anyway. Changing the interface takes care of this unnecessary overhead. Idea proposed by Al Viro. Signed-off-by: Ram Pai Signed-off-by: Al Viro Signed-off-by: Linus Torvalds --- fs/namespace.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) (limited to 'fs') diff --git a/fs/namespace.c b/fs/namespace.c index 685687dccbf..dfeeab964e8 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -650,7 +650,6 @@ static int graft_tree(struct vfsmount *mnt, struct nameidata *nd) attach_mnt(mnt, nd); list_add_tail(&head, &mnt->mnt_list); list_splice(&head, current->namespace->list.prev); - mntget(mnt); err = 0; touch_namespace(current->namespace); } @@ -702,8 +701,7 @@ static int do_loopback(struct nameidata *nd, char *old_name, int recurse) spin_lock(&vfsmount_lock); umount_tree(mnt); spin_unlock(&vfsmount_lock); - } else - mntput(mnt); + } out: up_write(¤t->namespace->sem); @@ -857,15 +855,17 @@ int do_add_mount(struct vfsmount *newmnt, struct nameidata *nd, goto unlock; newmnt->mnt_flags = mnt_flags; - newmnt->mnt_namespace = current->namespace; - err = graft_tree(newmnt, nd); + if ((err = graft_tree(newmnt, nd))) + goto unlock; - if (err == 0 && fslist) { + if (fslist) { /* add to the specified expiration list */ spin_lock(&vfsmount_lock); list_add_tail(&newmnt->mnt_expire, fslist); spin_unlock(&vfsmount_lock); } + up_write(¤t->namespace->sem); + return 0; unlock: up_write(¤t->namespace->sem); -- cgit v1.2.3-70-g09d2