130 lines
3.4 KiB
C
130 lines
3.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "kerncompat.h"
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#include "radix-tree.h"
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#include "ctree.h"
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#include "disk-io.h"
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#include "hash.h"
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#include "transaction.h"
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static struct btrfs_dir_item *insert_with_overflow(struct
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btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct btrfs_path *path,
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struct btrfs_key *cpu_key,
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u32 data_size)
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{
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int ret;
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char *ptr;
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struct btrfs_item *item;
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struct btrfs_leaf *leaf;
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ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
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if (ret == -EEXIST) {
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ret = btrfs_extend_item(trans, root, path, data_size);
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BUG_ON(ret > 0);
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if (ret)
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return NULL;
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}
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BUG_ON(ret > 0);
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leaf = &path->nodes[0]->leaf;
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item = leaf->items + path->slots[0];
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ptr = btrfs_item_ptr(leaf, path->slots[0], char);
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BUG_ON(data_size > btrfs_item_size(item));
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ptr += btrfs_item_size(item) - data_size;
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return (struct btrfs_dir_item *)ptr;
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}
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int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, char *name, int name_len, u64 dir,
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struct btrfs_key *location, u8 type)
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{
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int ret = 0;
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struct btrfs_path path;
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struct btrfs_dir_item *dir_item;
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char *name_ptr;
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struct btrfs_key key;
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u32 data_size;
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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if (name_len == 1 && *name == '.')
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key.offset = 1;
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else if (name_len == 2 && name[0] == '.' && name[1] == '.')
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key.offset = 2;
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else
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ret = btrfs_name_hash(name, name_len, &key.offset);
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BUG_ON(ret);
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btrfs_init_path(&path);
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data_size = sizeof(*dir_item) + name_len;
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dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
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if (!dir_item) {
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ret = -1;
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goto out;
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}
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btrfs_cpu_key_to_disk(&dir_item->location, location);
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btrfs_set_dir_type(dir_item, type);
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btrfs_set_dir_flags(dir_item, 0);
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btrfs_set_dir_name_len(dir_item, name_len);
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name_ptr = (char *)(dir_item + 1);
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memcpy(name_ptr, name, name_len);
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/* FIXME, use some real flag for selecting the extra index */
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if (root == root->fs_info->tree_root)
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goto out;
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btrfs_release_path(root, &path);
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btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
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key.offset = location->objectid;
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dir_item = insert_with_overflow(trans, root, &path, &key, data_size);
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if (!dir_item) {
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ret = -1;
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goto out;
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}
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btrfs_cpu_key_to_disk(&dir_item->location, location);
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btrfs_set_dir_type(dir_item, type);
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btrfs_set_dir_flags(dir_item, 0);
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btrfs_set_dir_name_len(dir_item, name_len);
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name_ptr = (char *)(dir_item + 1);
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memcpy(name_ptr, name, name_len);
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out:
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btrfs_release_path(root, &path);
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return ret;
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}
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int btrfs_lookup_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
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*root, struct btrfs_path *path, u64 dir, char *name,
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int name_len, int mod)
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{
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int ret;
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struct btrfs_key key;
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int ins_len = mod < 0 ? -1 : 0;
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int cow = mod != 0;
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key.objectid = dir;
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key.flags = 0;
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btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
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ret = btrfs_name_hash(name, name_len, &key.offset);
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BUG_ON(ret);
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ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
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return ret;
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}
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int btrfs_match_dir_item_name(struct btrfs_root *root,
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struct btrfs_path *path, char
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*name, int name_len)
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{
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struct btrfs_dir_item *dir_item;
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char *name_ptr;
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dir_item = btrfs_item_ptr(&path->nodes[0]->leaf, path->slots[0],
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struct btrfs_dir_item);
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if (btrfs_dir_name_len(dir_item) != name_len)
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return 0;
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name_ptr = (char *)(dir_item + 1);
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if (memcmp(name_ptr, name, name_len))
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return 0;
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return 1;
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}
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