mirror of
https://github.com/kdave/btrfs-progs
synced 2024-12-09 16:07:03 +00:00
3efc459166
For code reuse, btrfs_insert_dir_item() now calls inserts_with_overflow() even if the dir_item existed. Add a parameter @ignore_existed to btrfs_add_link(). If @ignore_existed is not zero, btrfs_add_link() continues to do link. Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
707 lines
18 KiB
C
707 lines
18 KiB
C
/*
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* Copyright (C) 2014 Fujitsu. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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/*
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* Unlike inode.c in kernel, which can use most of the kernel infrastructure
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* like inode/dentry things, in user-land, we can only use inode number to
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* do directly operation on extent buffer, which may cause extra searching,
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* but should not be a huge problem since progs is less performance sensitive.
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*/
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#include <sys/stat.h>
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#include "ctree.h"
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#include "transaction.h"
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#include "disk-io.h"
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#include "time.h"
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#include "messages.h"
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/*
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* Find a free inode index for later btrfs_add_link().
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* Currently just search from the largest dir_index and +1.
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*/
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static int btrfs_find_free_dir_index(struct btrfs_root *root, u64 dir_ino,
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u64 *ret_ino)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_key found_key;
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u64 ret_val = 2;
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int ret = 0;
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if (!ret_ino)
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return 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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key.objectid = dir_ino;
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key.type = BTRFS_DIR_INDEX_KEY;
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key.offset = (u64)-1;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto out;
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ret = 0;
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if (path->slots[0] == 0) {
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ret = btrfs_prev_leaf(root, path);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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/*
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* This shouldn't happen since there must be a leaf
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* containing the DIR_ITEM.
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* Can only happen when the previous leaf is corrupted.
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*/
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ret = -EIO;
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goto out;
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}
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} else {
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path->slots[0]--;
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}
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btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
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if (found_key.objectid != dir_ino ||
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found_key.type != BTRFS_DIR_INDEX_KEY)
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goto out;
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ret_val = found_key.offset + 1;
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out:
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btrfs_free_path(path);
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if (ret == 0)
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*ret_ino = ret_val;
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return ret;
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}
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/* Check the dir_item/index conflicts before insert */
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int check_dir_conflict(struct btrfs_root *root, char *name, int namelen,
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u64 dir, u64 index)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_inode_item *inode_item;
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struct btrfs_dir_item *dir_item;
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int ret = 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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/* Given dir exists? */
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key.objectid = dir;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
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if (ret < 0)
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goto out;
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if (ret > 0) {
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ret = -ENOENT;
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goto out;
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}
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/* Is it a dir? */
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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if (!(btrfs_inode_mode(path->nodes[0], inode_item) & S_IFDIR)) {
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ret = -ENOTDIR;
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goto out;
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}
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btrfs_release_path(path);
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/* Name conflicting? */
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dir_item = btrfs_lookup_dir_item(NULL, root, path, dir, name,
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namelen, 0);
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (dir_item) {
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ret = -EEXIST;
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goto out;
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}
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btrfs_release_path(path);
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/* Index conflicting? */
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dir_item = btrfs_lookup_dir_index(NULL, root, path, dir, name,
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namelen, index, 0);
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if (IS_ERR(dir_item) && PTR_ERR(dir_item) == -ENOENT)
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dir_item = NULL;
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (dir_item) {
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ret = -EEXIST;
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goto out;
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}
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out:
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btrfs_free_path(path);
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return ret;
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}
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/*
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* Add dir_item/index for 'parent_ino' if add_backref is true, also insert a
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* backref from the ino to parent dir and update the nlink(Kernel version does
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* not do this thing)
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*
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* Currently only supports adding link from an inode to another inode.
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*/
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int btrfs_add_link(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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u64 ino, u64 parent_ino, char *name, int namelen,
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u8 type, u64 *index, int add_backref, int ignore_existed)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_inode_item *inode_item;
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u32 nlink;
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u64 inode_size;
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u64 ret_index = 0;
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int ret = 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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if (index && *index) {
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ret_index = *index;
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} else {
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ret = btrfs_find_free_dir_index(root, parent_ino, &ret_index);
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if (ret < 0)
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goto out;
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}
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ret = check_dir_conflict(root, name, namelen, parent_ino, ret_index);
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if (ret < 0 && !(ignore_existed && ret == -EEXIST))
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goto out;
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/* Add inode ref */
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if (add_backref) {
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ret = btrfs_insert_inode_ref(trans, root, name, namelen,
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ino, parent_ino, ret_index);
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if (ret < 0 && !(ignore_existed && ret == -EEXIST))
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goto out;
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/* do not update nlinks if existed */
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if (!ret) {
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/* Update nlinks for the inode */
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
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if (ret) {
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if (ret > 0)
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ret = -ENOENT;
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goto out;
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}
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inode_item = btrfs_item_ptr(path->nodes[0],
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path->slots[0], struct btrfs_inode_item);
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nlink = btrfs_inode_nlink(path->nodes[0], inode_item);
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nlink++;
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btrfs_set_inode_nlink(path->nodes[0], inode_item,
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nlink);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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}
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}
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/* Add dir_item and dir_index */
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_insert_dir_item(trans, root, name, namelen, parent_ino,
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&key, type, ret_index);
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if (ret < 0)
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goto out;
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/* Update inode size of the parent inode */
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key.objectid = parent_ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
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if (ret)
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goto out;
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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inode_size = btrfs_inode_size(path->nodes[0], inode_item);
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inode_size += namelen * 2;
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btrfs_set_inode_size(path->nodes[0], inode_item, inode_size);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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out:
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btrfs_free_path(path);
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if (ret == 0 && index)
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*index = ret_index;
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return ret;
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}
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int btrfs_add_orphan_item(struct btrfs_trans_handle *trans,
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struct btrfs_root *root, struct btrfs_path *path,
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u64 ino)
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{
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struct btrfs_key key;
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key.objectid = BTRFS_ORPHAN_OBJECTID;
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key.type = BTRFS_ORPHAN_ITEM_KEY;
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key.offset = ino;
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return btrfs_insert_empty_item(trans, root, path, &key, 0);
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}
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/*
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* Unlink an inode, which will remove its backref and corresponding dir_index/
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* dir_item if any of them exists.
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*
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* If an inode's nlink is reduced to 0 and 'add_orphan' is true, it will be
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* added to orphan inode and waiting to be deleted by next kernel mount.
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*/
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int btrfs_unlink(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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u64 ino, u64 parent_ino, u64 index, const char *name,
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int namelen, int add_orphan)
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{
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struct btrfs_path *path;
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struct btrfs_key key;
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struct btrfs_inode_item *inode_item;
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struct btrfs_inode_ref *inode_ref;
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struct btrfs_dir_item *dir_item;
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u64 inode_size;
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u32 nlinks;
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int del_inode_ref = 0;
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int del_dir_item = 0;
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int del_dir_index = 0;
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int ret = 0;
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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/* check the ref and backref exists */
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inode_ref = btrfs_lookup_inode_ref(trans, root, path, name, namelen,
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ino, parent_ino, 0);
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if (IS_ERR(inode_ref)) {
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ret = PTR_ERR(inode_ref);
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goto out;
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}
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if (inode_ref)
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del_inode_ref = 1;
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btrfs_release_path(path);
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dir_item = btrfs_lookup_dir_item(NULL, root, path, parent_ino,
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name, namelen, 0);
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (dir_item)
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del_dir_item = 1;
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btrfs_release_path(path);
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dir_item = btrfs_lookup_dir_index(NULL, root, path, parent_ino,
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name, namelen, index, 0);
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/*
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* Since lookup_dir_index() will return -ENOENT when not found,
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* we need to do extra check.
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*/
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if (IS_ERR(dir_item) && PTR_ERR(dir_item) == -ENOENT)
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dir_item = NULL;
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (dir_item)
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del_dir_index = 1;
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btrfs_release_path(path);
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if (!del_inode_ref && !del_dir_item && !del_dir_index) {
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/* All not found, shouldn't happen */
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ret = -ENOENT;
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goto out;
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}
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if (del_inode_ref) {
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/* Only decrease nlink when deleting inode_ref */
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key.objectid = ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret) {
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if (ret > 0)
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ret = -ENOENT;
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goto out;
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}
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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nlinks = btrfs_inode_nlink(path->nodes[0], inode_item);
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if (nlinks > 0)
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nlinks--;
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btrfs_set_inode_nlink(path->nodes[0], inode_item, nlinks);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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/* For nlinks == 0, add it to orphan list if needed */
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if (nlinks == 0 && add_orphan) {
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ret = btrfs_add_orphan_item(trans, root, path, ino);
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if (ret < 0)
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goto out;
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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}
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ret = btrfs_del_inode_ref(trans, root, name, namelen, ino,
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parent_ino, &index);
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if (ret < 0)
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goto out;
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}
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if (del_dir_index) {
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dir_item = btrfs_lookup_dir_index(trans, root, path,
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parent_ino, name, namelen,
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index, -1);
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (!dir_item) {
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ret = -ENOENT;
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goto out;
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}
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ret = btrfs_delete_one_dir_name(trans, root, path, dir_item);
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if (ret)
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goto out;
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btrfs_release_path(path);
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/* Update inode size of the parent inode */
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key.objectid = parent_ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
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if (ret)
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goto out;
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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inode_size = btrfs_inode_size(path->nodes[0], inode_item);
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if (inode_size >= namelen)
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inode_size -= namelen;
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btrfs_set_inode_size(path->nodes[0], inode_item, inode_size);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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}
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if (del_dir_item) {
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dir_item = btrfs_lookup_dir_item(trans, root, path, parent_ino,
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name, namelen, -1);
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if (IS_ERR(dir_item)) {
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ret = PTR_ERR(dir_item);
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goto out;
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}
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if (!dir_item) {
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ret = -ENOENT;
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goto out;
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}
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ret = btrfs_delete_one_dir_name(trans, root, path, dir_item);
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if (ret < 0)
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goto out;
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btrfs_release_path(path);
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/* Update inode size of the parent inode */
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key.objectid = parent_ino;
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key.type = BTRFS_INODE_ITEM_KEY;
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key.offset = 0;
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ret = btrfs_search_slot(trans, root, &key, path, 1, 1);
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if (ret)
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goto out;
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inode_item = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_item);
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inode_size = btrfs_inode_size(path->nodes[0], inode_item);
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if (inode_size >= namelen)
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inode_size -= namelen;
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btrfs_set_inode_size(path->nodes[0], inode_item, inode_size);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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btrfs_release_path(path);
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}
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out:
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btrfs_free_path(path);
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return ret;
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}
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/* Fill inode item with 'mode'. Uid/gid to root/root */
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static void fill_inode_item(struct btrfs_trans_handle *trans,
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struct btrfs_inode_item *inode_item,
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u32 mode, u32 nlink)
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{
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time_t now = time(NULL);
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btrfs_set_stack_inode_generation(inode_item, trans->transid);
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btrfs_set_stack_inode_uid(inode_item, 0);
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btrfs_set_stack_inode_gid(inode_item, 0);
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btrfs_set_stack_inode_size(inode_item, 0);
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btrfs_set_stack_inode_mode(inode_item, mode);
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btrfs_set_stack_inode_nlink(inode_item, nlink);
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btrfs_set_stack_timespec_sec(&inode_item->atime, now);
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btrfs_set_stack_timespec_nsec(&inode_item->atime, 0);
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btrfs_set_stack_timespec_sec(&inode_item->mtime, now);
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btrfs_set_stack_timespec_nsec(&inode_item->mtime, 0);
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btrfs_set_stack_timespec_sec(&inode_item->ctime, now);
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btrfs_set_stack_timespec_nsec(&inode_item->ctime, 0);
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}
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/*
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* Unlike kernel btrfs_new_inode(), we only create the INODE_ITEM, without
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* its backref.
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* The backref is added by btrfs_add_link().
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*/
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int btrfs_new_inode(struct btrfs_trans_handle *trans, struct btrfs_root *root,
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u64 ino, u32 mode)
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{
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struct btrfs_inode_item inode_item = {0};
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int ret = 0;
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fill_inode_item(trans, &inode_item, mode, 0);
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ret = btrfs_insert_inode(trans, root, ino, &inode_item);
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return ret;
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}
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/*
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* Change inode flags to given value
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*/
|
|
int btrfs_change_inode_flags(struct btrfs_trans_handle *trans,
|
|
struct btrfs_root *root, u64 ino, u64 flags)
|
|
{
|
|
struct btrfs_inode_item *item;
|
|
struct btrfs_path *path;
|
|
struct btrfs_key key;
|
|
int ret;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
key.objectid = ino;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
key.offset = 0;
|
|
|
|
ret = btrfs_search_slot(trans, root, &key, path, 0, 1);
|
|
if (ret > 0) {
|
|
ret = -ENOENT;
|
|
goto out;
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
item = btrfs_item_ptr(path->nodes[0], path->slots[0],
|
|
struct btrfs_inode_item);
|
|
btrfs_set_inode_flags(path->nodes[0], item, flags);
|
|
btrfs_mark_buffer_dirty(path->nodes[0]);
|
|
out:
|
|
btrfs_free_path(path);
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Make a dir under the parent inode 'parent_ino' with 'name'
|
|
* and 'mode', The owner will be root/root.
|
|
*/
|
|
int btrfs_mkdir(struct btrfs_trans_handle *trans, struct btrfs_root *root,
|
|
char *name, int namelen, u64 parent_ino, u64 *ino, int mode)
|
|
{
|
|
struct btrfs_dir_item *dir_item;
|
|
struct btrfs_path *path;
|
|
u64 ret_ino = 0;
|
|
int ret = 0;
|
|
|
|
path = btrfs_alloc_path();
|
|
if (!path)
|
|
return -ENOMEM;
|
|
|
|
if (ino && *ino)
|
|
ret_ino = *ino;
|
|
|
|
dir_item = btrfs_lookup_dir_item(NULL, root, path, parent_ino,
|
|
name, namelen, 0);
|
|
if (IS_ERR(dir_item)) {
|
|
ret = PTR_ERR(dir_item);
|
|
goto out;
|
|
}
|
|
|
|
if (dir_item) {
|
|
struct btrfs_key found_key;
|
|
|
|
/*
|
|
* Already have conflicting name, check if it is a dir.
|
|
* Either way, no need to continue.
|
|
*/
|
|
btrfs_dir_item_key_to_cpu(path->nodes[0], dir_item, &found_key);
|
|
ret_ino = found_key.objectid;
|
|
if (btrfs_dir_type(path->nodes[0], dir_item) != BTRFS_FT_DIR)
|
|
ret = -EEXIST;
|
|
goto out;
|
|
}
|
|
|
|
if (!ret_ino)
|
|
/*
|
|
* This is *UNSAFE* if some leaf is corrupted,
|
|
* only used as a fallback method. Caller should either
|
|
* ensure the fs is OK or pass ino with unused inode number.
|
|
*/
|
|
ret = btrfs_find_free_objectid(NULL, root, parent_ino,
|
|
&ret_ino);
|
|
if (ret)
|
|
goto out;
|
|
ret = btrfs_new_inode(trans, root, ret_ino, mode | S_IFDIR);
|
|
if (ret)
|
|
goto out;
|
|
ret = btrfs_add_link(trans, root, ret_ino, parent_ino, name, namelen,
|
|
BTRFS_FT_DIR, NULL, 1, 0);
|
|
if (ret)
|
|
goto out;
|
|
out:
|
|
btrfs_free_path(path);
|
|
if (ret == 0 && ino)
|
|
*ino = ret_ino;
|
|
return ret;
|
|
}
|
|
|
|
struct btrfs_root *btrfs_mksubvol(struct btrfs_root *root,
|
|
const char *base, u64 root_objectid,
|
|
bool convert)
|
|
{
|
|
struct btrfs_trans_handle *trans;
|
|
struct btrfs_fs_info *fs_info = root->fs_info;
|
|
struct btrfs_root *tree_root = fs_info->tree_root;
|
|
struct btrfs_root *new_root = NULL;
|
|
struct btrfs_path path;
|
|
struct btrfs_inode_item *inode_item;
|
|
struct extent_buffer *leaf;
|
|
struct btrfs_key key;
|
|
u64 dirid = btrfs_root_dirid(&root->root_item);
|
|
u64 index = 2;
|
|
char buf[BTRFS_NAME_LEN + 1]; /* for snprintf null */
|
|
int len;
|
|
int i;
|
|
int ret;
|
|
|
|
len = strlen(base);
|
|
if (len == 0 || len > BTRFS_NAME_LEN)
|
|
return NULL;
|
|
|
|
btrfs_init_path(&path);
|
|
key.objectid = dirid;
|
|
key.type = BTRFS_DIR_INDEX_KEY;
|
|
key.offset = (u64)-1;
|
|
|
|
ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
|
|
if (ret <= 0) {
|
|
error("search for DIR_INDEX dirid %llu failed: %d",
|
|
(unsigned long long)dirid, ret);
|
|
goto fail;
|
|
}
|
|
|
|
if (path.slots[0] > 0) {
|
|
path.slots[0]--;
|
|
btrfs_item_key_to_cpu(path.nodes[0], &key, path.slots[0]);
|
|
if (key.objectid == dirid && key.type == BTRFS_DIR_INDEX_KEY)
|
|
index = key.offset + 1;
|
|
}
|
|
btrfs_release_path(&path);
|
|
|
|
trans = btrfs_start_transaction(root, 1);
|
|
if (IS_ERR(trans)) {
|
|
error("unable to start transaction");
|
|
goto fail;
|
|
}
|
|
|
|
key.objectid = dirid;
|
|
key.offset = 0;
|
|
key.type = BTRFS_INODE_ITEM_KEY;
|
|
|
|
ret = btrfs_lookup_inode(trans, root, &path, &key, 1);
|
|
if (ret) {
|
|
error("search for INODE_ITEM %llu failed: %d",
|
|
(unsigned long long)dirid, ret);
|
|
goto fail;
|
|
}
|
|
leaf = path.nodes[0];
|
|
inode_item = btrfs_item_ptr(leaf, path.slots[0],
|
|
struct btrfs_inode_item);
|
|
|
|
key.objectid = root_objectid;
|
|
key.offset = (u64)-1;
|
|
key.type = BTRFS_ROOT_ITEM_KEY;
|
|
|
|
memcpy(buf, base, len);
|
|
if (convert) {
|
|
for (i = 0; i < 1024; i++) {
|
|
ret = btrfs_insert_dir_item(trans, root, buf, len,
|
|
dirid, &key, BTRFS_FT_DIR, index);
|
|
if (ret != -EEXIST)
|
|
break;
|
|
len = snprintf(buf, ARRAY_SIZE(buf), "%s%d", base, i);
|
|
if (len < 1 || len > BTRFS_NAME_LEN) {
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
ret = btrfs_insert_dir_item(trans, root, buf, len, dirid, &key,
|
|
BTRFS_FT_DIR, index);
|
|
}
|
|
if (ret)
|
|
goto fail;
|
|
|
|
btrfs_set_inode_size(leaf, inode_item, len * 2 +
|
|
btrfs_inode_size(leaf, inode_item));
|
|
btrfs_mark_buffer_dirty(leaf);
|
|
btrfs_release_path(&path);
|
|
|
|
/* add the backref first */
|
|
ret = btrfs_add_root_ref(trans, tree_root, root_objectid,
|
|
BTRFS_ROOT_BACKREF_KEY,
|
|
root->root_key.objectid,
|
|
dirid, index, buf, len);
|
|
if (ret) {
|
|
error("unable to add root backref for %llu: %d",
|
|
root->root_key.objectid, ret);
|
|
goto fail;
|
|
}
|
|
|
|
/* now add the forward ref */
|
|
ret = btrfs_add_root_ref(trans, tree_root, root->root_key.objectid,
|
|
BTRFS_ROOT_REF_KEY, root_objectid,
|
|
dirid, index, buf, len);
|
|
if (ret) {
|
|
error("unable to add root ref for %llu: %d",
|
|
root->root_key.objectid, ret);
|
|
goto fail;
|
|
}
|
|
|
|
ret = btrfs_commit_transaction(trans, root);
|
|
if (ret) {
|
|
error("transaction commit failed: %d", ret);
|
|
goto fail;
|
|
}
|
|
|
|
new_root = btrfs_read_fs_root(fs_info, &key);
|
|
if (IS_ERR(new_root)) {
|
|
error("unable to fs read root: %lu", PTR_ERR(new_root));
|
|
new_root = NULL;
|
|
}
|
|
fail:
|
|
btrfs_init_path(&path);
|
|
return new_root;
|
|
}
|