diff options
| author | Ram Pai <linuxram@us.ibm.com> | 2005-11-07 17:16:29 -0500 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-11-07 18:18:10 -0800 |
| commit | 5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b (patch) | |
| tree | ae92239c963b2d3cb12e2a561913451a77752d55 /fs/namespace.c | |
| parent | b58fed8b1959d6b9e4c951a54adc8960e1401b18 (diff) | |
| download | blackbird-op-linux-5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b.tar.gz blackbird-op-linux-5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b.zip | |
[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 <linuxram@us.ibm.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs/namespace.c')
| -rw-r--r-- | fs/namespace.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/namespace.c b/fs/namespace.c index 685687dccbf1..dfeeab964e84 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); |
