From c8e7f449b225ee6c87454ac069f0a041035c5140 Mon Sep 17 00:00:00 2001 From: Jan Blunck Date: Mon, 9 Jun 2008 16:40:35 -0700 Subject: [patch 1/4] vfs: path_{get,put}() cleanups Here are some more places where path_{get,put}() can be used instead of dput()/mntput() pair. Signed-off-by: Jan Blunck Cc: Al Viro Cc: Jens Axboe Signed-off-by: Andrew Morton Signed-off-by: Al Viro --- fs/namei.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index c7e43536c49a..ee1544696e83 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -581,15 +581,13 @@ static __always_inline int link_path_walk(const char *name, struct nameidata *nd int result; /* make sure the stuff we saved doesn't go away */ - dget(save.dentry); - mntget(save.mnt); + path_get(&save); result = __link_path_walk(name, nd); if (result == -ESTALE) { /* nd->path had been dropped */ nd->path = save; - dget(nd->path.dentry); - mntget(nd->path.mnt); + path_get(&nd->path); nd->flags |= LOOKUP_REVAL; result = __link_path_walk(name, nd); } @@ -1216,8 +1214,9 @@ int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt, nd->flags = flags; nd->depth = 0; - nd->path.mnt = mntget(mnt); - nd->path.dentry = dget(dentry); + nd->path.dentry = dentry; + nd->path.mnt = mnt; + path_get(&nd->path); retval = path_walk(name, nd); if (unlikely(!retval && !audit_dummy_context() && nd->path.dentry && -- cgit v1.2.3 From 694a1764d657e0f7a9b139bc7269c8d5f5a2534b Mon Sep 17 00:00:00 2001 From: Marcin Slusarz Date: Mon, 9 Jun 2008 16:40:37 -0700 Subject: [patch 3/4] vfs: fix ERR_PTR abuse in generic_readlink generic_readlink calls ERR_PTR for negative and positive values (vfs_readlink returns length of "link"), but it should not (not an errno) and does not need to. Signed-off-by: Marcin Slusarz Cc: Al Viro Cc: Christoph Hellwig Acked-by: Miklos Szeredi Signed-off-by: Andrew Morton Signed-off-by: Al Viro --- fs/namei.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) (limited to 'fs/namei.c') diff --git a/fs/namei.c b/fs/namei.c index ee1544696e83..01e67dddcc3d 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2856,16 +2856,17 @@ int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen) { struct nameidata nd; void *cookie; + int res; nd.depth = 0; cookie = dentry->d_inode->i_op->follow_link(dentry, &nd); - if (!IS_ERR(cookie)) { - int res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd)); - if (dentry->d_inode->i_op->put_link) - dentry->d_inode->i_op->put_link(dentry, &nd, cookie); - cookie = ERR_PTR(res); - } - return PTR_ERR(cookie); + if (IS_ERR(cookie)) + return PTR_ERR(cookie); + + res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd)); + if (dentry->d_inode->i_op->put_link) + dentry->d_inode->i_op->put_link(dentry, &nd, cookie); + return res; } int vfs_follow_link(struct nameidata *nd, const char *link) -- cgit v1.2.3