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authorRam Pai <linuxram@us.ibm.com>2005-11-07 17:16:29 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2005-11-07 18:18:10 -0800
commit5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b (patch)
treeae92239c963b2d3cb12e2a561913451a77752d55 /fs/namespace.c
parentb58fed8b1959d6b9e4c951a54adc8960e1401b18 (diff)
downloadop-kernel-dev-5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b.zip
op-kernel-dev-5b83d2c5c0afcf5a3517cf00d9ceb41b8345e01b.tar.gz
[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.c12
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/namespace.c b/fs/namespace.c
index 685687d..dfeeab9 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(&current->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(&current->namespace->sem);
+ return 0;
unlock:
up_write(&current->namespace->sem);
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