diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namei.c | 54 |
1 files changed, 18 insertions, 36 deletions
diff --git a/fs/namei.c b/fs/namei.c index b292eb03d9d2..b45a039216c7 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2258,35 +2258,29 @@ struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt, return file; } -/** - * lookup_create - lookup a dentry, creating it if it doesn't exist - * @nd: nameidata info - * @is_dir: directory flag - * - * Simple function to lookup and return a dentry and create it - * if it doesn't exist. Is SMP-safe. - * - * Returns with nd->path.dentry->d_inode->i_mutex locked. - */ -struct dentry *lookup_create(struct nameidata *nd, int is_dir) +struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir) { struct dentry *dentry = ERR_PTR(-EEXIST); + struct nameidata nd; + int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd); + if (error) + return ERR_PTR(error); - mutex_lock_nested(&nd->path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); /* * Yucky last component or no last component at all? * (foo/., foo/.., /////) */ - if (nd->last_type != LAST_NORM) - goto fail; - nd->flags &= ~LOOKUP_PARENT; - nd->flags |= LOOKUP_CREATE | LOOKUP_EXCL; - nd->intent.open.flags = O_EXCL; + if (nd.last_type != LAST_NORM) + goto out; + nd.flags &= ~LOOKUP_PARENT; + nd.flags |= LOOKUP_CREATE | LOOKUP_EXCL; + nd.intent.open.flags = O_EXCL; /* * Do the final lookup. */ - dentry = lookup_hash(nd); + mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT); + dentry = lookup_hash(&nd); if (IS_ERR(dentry)) goto fail; @@ -2298,34 +2292,22 @@ struct dentry *lookup_create(struct nameidata *nd, int is_dir) * all is fine. Let's be bastards - you had / on the end, you've * been asking for (non-existent) directory. -ENOENT for you. */ - if (unlikely(!is_dir && nd->last.name[nd->last.len])) { + if (unlikely(!is_dir && nd.last.name[nd.last.len])) { dput(dentry); dentry = ERR_PTR(-ENOENT); + goto fail; } + *path = nd.path; return dentry; eexist: dput(dentry); dentry = ERR_PTR(-EEXIST); fail: + mutex_unlock(&nd.path.dentry->d_inode->i_mutex); +out: + path_put(&nd.path); return dentry; } -EXPORT_SYMBOL_GPL(lookup_create); - -struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir) -{ - struct nameidata nd; - struct dentry *res; - int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd); - if (error) - return ERR_PTR(error); - res = lookup_create(&nd, is_dir); - if (IS_ERR(res)) { - mutex_unlock(&nd.path.dentry->d_inode->i_mutex); - path_put(&nd.path); - } - *path = nd.path; - return res; -} EXPORT_SYMBOL(kern_path_create); struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir) |