blob: 130e5fde13e942cfcdb58cd6bcbd8a3f7da98d53 [file] [log] [blame]
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
#include <assert.h>
#include <string.h>
#include <nffs/nffs.h>
#include <nffs/os.h>
static struct nffs_dir *
nffs_dir_alloc(void)
{
struct nffs_dir *dir;
dir = nffs_os_mempool_get(&nffs_dir_pool);
if (dir != NULL) {
memset(dir, 0, sizeof *dir);
}
return dir;
}
static int
nffs_dir_free(struct nffs_dir *dir)
{
int rc;
if (dir != NULL) {
rc = nffs_os_mempool_free(&nffs_dir_pool, dir);
if (rc != 0) {
return FS_EOS;
}
}
return 0;
}
int
nffs_dir_open(const char *path, struct nffs_dir **out_dir)
{
struct nffs_inode_entry *parent_inode_entry;
struct nffs_dir *dir;
int rc;
rc = nffs_path_find_inode_entry(path, &parent_inode_entry);
if (rc != 0) {
return rc;
}
if (!nffs_hash_id_is_dir(parent_inode_entry->nie_hash_entry.nhe_id)) {
return FS_EINVAL;
}
dir = nffs_dir_alloc();
if (dir == NULL) {
return FS_ENOMEM;
}
dir->nd_parent_inode_entry = parent_inode_entry;
nffs_inode_inc_refcnt(dir->nd_parent_inode_entry);
memset(&dir->nd_dirent, 0, sizeof dir->nd_dirent);
OS_MULTIFS_SETOPS(dir->fops);
*out_dir = dir;
return 0;
}
int
nffs_dir_read(struct nffs_dir *dir, struct nffs_dirent **out_dirent)
{
struct nffs_inode_entry *child;
int rc;
if (dir->nd_dirent.nde_inode_entry == NULL) {
child = SLIST_FIRST(&dir->nd_parent_inode_entry->nie_child_list);
} else {
child = SLIST_NEXT(dir->nd_dirent.nde_inode_entry, nie_sibling_next);
rc = nffs_inode_dec_refcnt(dir->nd_dirent.nde_inode_entry);
if (rc != 0) {
/* XXX: Need to clean up anything? */
return rc;
}
}
dir->nd_dirent.nde_inode_entry = child;
if (child == NULL) {
*out_dirent = NULL;
return FS_ENOENT;
}
nffs_inode_inc_refcnt(child);
OS_MULTIFS_SETOPS(dir->nd_dirent.fops);
*out_dirent = &dir->nd_dirent;
return 0;
}
int
nffs_dir_close(struct nffs_dir *dir)
{
int rc;
if (dir == NULL) {
return 0;
}
if (dir->nd_dirent.nde_inode_entry != NULL) {
rc = nffs_inode_dec_refcnt(dir->nd_dirent.nde_inode_entry);
if (rc != 0) {
return rc;
}
}
rc = nffs_inode_dec_refcnt(dir->nd_parent_inode_entry);
if (rc != 0) {
return rc;
}
rc = nffs_dir_free(dir);
if (rc != 0) {
return rc;
}
return 0;
}