1 #include <linux/module.h>
5 #include "transaction.h"
7 struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle *trans,
8 struct btrfs_root *root,
9 struct btrfs_path *path,
10 struct btrfs_key *cpu_key,
15 struct btrfs_item *item;
16 struct btrfs_leaf *leaf;
18 ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
20 ret = btrfs_extend_item(trans, root, path, data_size);
26 leaf = btrfs_buffer_leaf(path->nodes[0]);
27 item = leaf->items + path->slots[0];
28 ptr = btrfs_item_ptr(leaf, path->slots[0], char);
29 BUG_ON(data_size > btrfs_item_size(item));
30 ptr += btrfs_item_size(item) - data_size;
31 return (struct btrfs_dir_item *)ptr;
34 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
35 *root, const char *name, int name_len, u64 dir,
36 struct btrfs_key *location, u8 type)
39 struct btrfs_path *path;
40 struct btrfs_dir_item *dir_item;
47 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
48 ret = btrfs_name_hash(name, name_len, &key.offset);
50 path = btrfs_alloc_path();
51 btrfs_init_path(path);
52 data_size = sizeof(*dir_item) + name_len;
53 dir_item = insert_with_overflow(trans, root, path, &key, data_size);
54 if (IS_ERR(dir_item)) {
55 ret = PTR_ERR(dir_item);
59 btrfs_cpu_key_to_disk(&dir_item->location, location);
60 btrfs_set_dir_type(dir_item, type);
61 btrfs_set_dir_flags(dir_item, 0);
62 btrfs_set_dir_name_len(dir_item, name_len);
63 name_ptr = (char *)(dir_item + 1);
65 btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
66 btrfs_mark_buffer_dirty(path->nodes[0]);
68 /* FIXME, use some real flag for selecting the extra index */
69 if (root == root->fs_info->tree_root) {
74 btrfs_release_path(root, path);
76 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
77 key.offset = location->objectid;
78 dir_item = insert_with_overflow(trans, root, path, &key, data_size);
79 if (IS_ERR(dir_item)) {
80 ret = PTR_ERR(dir_item);
83 btrfs_cpu_key_to_disk(&dir_item->location, location);
84 btrfs_set_dir_type(dir_item, type);
85 btrfs_set_dir_flags(dir_item, 0);
86 btrfs_set_dir_name_len(dir_item, name_len);
87 name_ptr = (char *)(dir_item + 1);
88 btrfs_memcpy(root, path->nodes[0]->b_data, name_ptr, name, name_len);
89 btrfs_mark_buffer_dirty(path->nodes[0]);
91 btrfs_free_path(path);
95 struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
96 struct btrfs_root *root,
97 struct btrfs_path *path, u64 dir,
98 const char *name, int name_len,
102 struct btrfs_key key;
103 int ins_len = mod < 0 ? -1 : 0;
105 struct btrfs_disk_key *found_key;
106 struct btrfs_leaf *leaf;
110 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
111 ret = btrfs_name_hash(name, name_len, &key.offset);
113 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
117 if (path->slots[0] == 0)
121 leaf = btrfs_buffer_leaf(path->nodes[0]);
122 found_key = &leaf->items[path->slots[0]].key;
124 if (btrfs_disk_key_objectid(found_key) != dir ||
125 btrfs_disk_key_type(found_key) != BTRFS_DIR_ITEM_KEY ||
126 btrfs_disk_key_offset(found_key) != key.offset)
129 return btrfs_match_dir_item_name(root, path, name, name_len);
132 struct btrfs_dir_item *
133 btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
134 struct btrfs_root *root,
135 struct btrfs_path *path, u64 dir,
136 u64 objectid, const char *name, int name_len,
140 struct btrfs_key key;
141 int ins_len = mod < 0 ? -1 : 0;
146 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
147 key.offset = objectid;
149 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
153 return ERR_PTR(-ENOENT);
154 return btrfs_match_dir_item_name(root, path, name, name_len);
157 struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
158 struct btrfs_path *path,
159 const char *name, int name_len)
161 struct btrfs_dir_item *dir_item;
166 struct btrfs_leaf *leaf;
168 leaf = btrfs_buffer_leaf(path->nodes[0]);
169 dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
170 total_len = btrfs_item_size(leaf->items + path->slots[0]);
171 while(cur < total_len) {
172 this_len = sizeof(*dir_item) + btrfs_dir_name_len(dir_item);
173 name_ptr = (char *)(dir_item + 1);
175 if (btrfs_dir_name_len(dir_item) == name_len &&
176 memcmp(name_ptr, name, name_len) == 0)
180 dir_item = (struct btrfs_dir_item *)((char *)dir_item +
186 int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
187 struct btrfs_root *root,
188 struct btrfs_path *path,
189 struct btrfs_dir_item *di)
192 struct btrfs_leaf *leaf;
197 leaf = btrfs_buffer_leaf(path->nodes[0]);
198 sub_item_len = sizeof(*di) + btrfs_dir_name_len(di);
199 item_len = btrfs_item_size(leaf->items + path->slots[0]);
200 if (sub_item_len == btrfs_item_size(leaf->items + path->slots[0])) {
201 ret = btrfs_del_item(trans, root, path);
204 char *ptr = (char *)di;
205 char *start = btrfs_item_ptr(leaf, path->slots[0], char);
206 btrfs_memmove(root, leaf, ptr, ptr + sub_item_len,
207 item_len - (ptr + sub_item_len - start));
208 ret = btrfs_truncate_item(trans, root, path,
209 item_len - sub_item_len);