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![Yan, Zheng](/assets/img/avatar_default.png)
Besides simplify the code, this change makes sure all metadata reservation for normal metadata operations are released after committing transaction. Changes since V1: Add code that check if unlink and rmdir will free space. Add ENOSPC handling for clone ioctl. Signed-off-by: Yan Zheng <zheng.yan@oracle.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
236 lines
6.3 KiB
C
236 lines
6.3 KiB
C
/*
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* Copyright (C) 2007 Oracle. 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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#include "ctree.h"
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#include "disk-io.h"
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#include "transaction.h"
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static int find_name_in_backref(struct btrfs_path *path, const char *name,
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int name_len, struct btrfs_inode_ref **ref_ret)
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{
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struct extent_buffer *leaf;
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struct btrfs_inode_ref *ref;
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unsigned long ptr;
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unsigned long name_ptr;
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u32 item_size;
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u32 cur_offset = 0;
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int len;
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leaf = path->nodes[0];
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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ptr = btrfs_item_ptr_offset(leaf, path->slots[0]);
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while (cur_offset < item_size) {
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ref = (struct btrfs_inode_ref *)(ptr + cur_offset);
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len = btrfs_inode_ref_name_len(leaf, ref);
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name_ptr = (unsigned long)(ref + 1);
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cur_offset += len + sizeof(*ref);
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if (len != name_len)
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continue;
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if (memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0) {
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*ref_ret = ref;
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return 1;
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}
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}
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return 0;
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}
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struct btrfs_inode_ref *
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btrfs_lookup_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid, int mod)
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{
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struct btrfs_key key;
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struct btrfs_inode_ref *ref;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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int ret;
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key.objectid = inode_objectid;
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key.type = BTRFS_INODE_REF_KEY;
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key.offset = ref_objectid;
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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if (ret < 0)
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return ERR_PTR(ret);
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if (ret > 0)
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return NULL;
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if (!find_name_in_backref(path, name, name_len, &ref))
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return NULL;
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return ref;
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}
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int btrfs_del_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid, 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_ref *ref;
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struct extent_buffer *leaf;
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unsigned long ptr;
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unsigned long item_start;
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u32 item_size;
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u32 sub_item_len;
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int ret;
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int del_len = name_len + sizeof(*ref);
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key.objectid = inode_objectid;
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key.offset = ref_objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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path->leave_spinning = 1;
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ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
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if (ret > 0) {
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ret = -ENOENT;
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goto out;
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} else if (ret < 0) {
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goto out;
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}
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if (!find_name_in_backref(path, name, name_len, &ref)) {
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ret = -ENOENT;
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goto out;
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}
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leaf = path->nodes[0];
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item_size = btrfs_item_size_nr(leaf, path->slots[0]);
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if (index)
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*index = btrfs_inode_ref_index(leaf, ref);
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if (del_len == item_size) {
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ret = btrfs_del_item(trans, root, path);
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goto out;
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}
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ptr = (unsigned long)ref;
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sub_item_len = name_len + sizeof(*ref);
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item_start = btrfs_item_ptr_offset(leaf, path->slots[0]);
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memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
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item_size - (ptr + sub_item_len - item_start));
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ret = btrfs_truncate_item(trans, root, path,
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item_size - sub_item_len, 1);
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BUG_ON(ret);
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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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int btrfs_insert_inode_ref(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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const char *name, int name_len,
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u64 inode_objectid, u64 ref_objectid, 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_ref *ref;
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unsigned long ptr;
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int ret;
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int ins_len = name_len + sizeof(*ref);
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key.objectid = inode_objectid;
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key.offset = ref_objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_REF_KEY);
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path = btrfs_alloc_path();
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if (!path)
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return -ENOMEM;
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path->leave_spinning = 1;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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ins_len);
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if (ret == -EEXIST) {
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u32 old_size;
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if (find_name_in_backref(path, name, name_len, &ref))
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goto out;
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old_size = btrfs_item_size_nr(path->nodes[0], path->slots[0]);
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ret = btrfs_extend_item(trans, root, path, ins_len);
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BUG_ON(ret);
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ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_ref);
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ref = (struct btrfs_inode_ref *)((unsigned long)ref + old_size);
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btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
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btrfs_set_inode_ref_index(path->nodes[0], ref, index);
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ptr = (unsigned long)(ref + 1);
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ret = 0;
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} else if (ret < 0) {
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if (ret == -EOVERFLOW)
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ret = -EMLINK;
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goto out;
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} else {
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ref = btrfs_item_ptr(path->nodes[0], path->slots[0],
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struct btrfs_inode_ref);
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btrfs_set_inode_ref_name_len(path->nodes[0], ref, name_len);
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btrfs_set_inode_ref_index(path->nodes[0], ref, index);
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ptr = (unsigned long)(ref + 1);
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}
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write_extent_buffer(path->nodes[0], name, ptr, name_len);
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btrfs_mark_buffer_dirty(path->nodes[0]);
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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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int btrfs_insert_empty_inode(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path, u64 objectid)
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{
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struct btrfs_key key;
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int ret;
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key.objectid = objectid;
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btrfs_set_key_type(&key, BTRFS_INODE_ITEM_KEY);
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key.offset = 0;
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ret = btrfs_insert_empty_item(trans, root, path, &key,
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sizeof(struct btrfs_inode_item));
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return ret;
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}
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int btrfs_lookup_inode(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path,
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struct btrfs_key *location, int mod)
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{
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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int ret;
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int slot;
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struct extent_buffer *leaf;
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struct btrfs_key found_key;
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ret = btrfs_search_slot(trans, root, location, path, ins_len, cow);
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if (ret > 0 && btrfs_key_type(location) == BTRFS_ROOT_ITEM_KEY &&
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location->offset == (u64)-1 && path->slots[0] != 0) {
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slot = path->slots[0] - 1;
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leaf = path->nodes[0];
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btrfs_item_key_to_cpu(leaf, &found_key, slot);
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if (found_key.objectid == location->objectid &&
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btrfs_key_type(&found_key) == btrfs_key_type(location)) {
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path->slots[0]--;
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return 0;
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}
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}
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return ret;
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}
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