blob: eb4dd3d75cf97b137f048c5b88b71291e45008c4 [file] [log] [blame]
Chris Mason6cbd5572007-06-12 09:07:21 -04001/*
2 * Copyright (C) 2007 Oracle. All rights reserved.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public
6 * License v2 as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful,
9 * but WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public
14 * License along with this program; if not, write to the
15 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
16 * Boston, MA 021110-1307, USA.
17 */
18
Chris Mason62e27492007-03-15 12:56:47 -040019#include "ctree.h"
20#include "disk-io.h"
21#include "hash.h"
Chris Masone089f052007-03-16 16:20:31 -040022#include "transaction.h"
Chris Mason62e27492007-03-15 12:56:47 -040023
Chris Mason35b7e472007-05-02 15:53:43 -040024static struct btrfs_dir_item *insert_with_overflow(struct btrfs_trans_handle
25 *trans,
26 struct btrfs_root *root,
27 struct btrfs_path *path,
28 struct btrfs_key *cpu_key,
Chris Masone06afa82007-05-23 15:44:28 -040029 u32 data_size,
30 const char *name,
31 int name_len)
Chris Mason7fcde0e2007-04-05 12:13:21 -040032{
Chris Mason7fcde0e2007-04-05 12:13:21 -040033 int ret;
Chris Mason7e381802007-04-19 15:36:27 -040034 char *ptr;
35 struct btrfs_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040036 struct extent_buffer *leaf;
Chris Mason7fcde0e2007-04-05 12:13:21 -040037
38 ret = btrfs_insert_empty_item(trans, root, path, cpu_key, data_size);
Chris Mason7e381802007-04-19 15:36:27 -040039 if (ret == -EEXIST) {
Chris Masone06afa82007-05-23 15:44:28 -040040 struct btrfs_dir_item *di;
41 di = btrfs_match_dir_item_name(root, path, name, name_len);
42 if (di)
43 return ERR_PTR(-EEXIST);
Chris Mason7e381802007-04-19 15:36:27 -040044 ret = btrfs_extend_item(trans, root, path, data_size);
45 WARN_ON(ret > 0);
Chris Mason7fcde0e2007-04-05 12:13:21 -040046 }
Chris Mason54aa1f42007-06-22 14:16:25 -040047 if (ret < 0)
48 return ERR_PTR(ret);
Chris Mason7e381802007-04-19 15:36:27 -040049 WARN_ON(ret > 0);
Chris Mason5f39d392007-10-15 16:14:19 -040050 leaf = path->nodes[0];
51 item = btrfs_item_nr(leaf, path->slots[0]);
Chris Mason7e381802007-04-19 15:36:27 -040052 ptr = btrfs_item_ptr(leaf, path->slots[0], char);
Chris Mason5f39d392007-10-15 16:14:19 -040053 BUG_ON(data_size > btrfs_item_size(leaf, item));
54 ptr += btrfs_item_size(leaf, item) - data_size;
Chris Mason7e381802007-04-19 15:36:27 -040055 return (struct btrfs_dir_item *)ptr;
Chris Mason7fcde0e2007-04-05 12:13:21 -040056}
57
Josef Bacik5103e942007-11-16 11:45:54 -050058int btrfs_insert_xattr_item(struct btrfs_trans_handle *trans,
59 struct btrfs_root *root, const char *name,
60 u16 name_len, const void *data, u16 data_len,
61 u64 dir)
62{
63 int ret = 0;
64 struct btrfs_path *path;
65 struct btrfs_dir_item *dir_item;
66 unsigned long name_ptr, data_ptr;
67 struct btrfs_key key, location;
68 struct btrfs_disk_key disk_key;
69 struct extent_buffer *leaf;
70 u32 data_size;
71
72 key.objectid = dir;
73 btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
David Millerdf68b8a2008-02-15 10:40:52 -050074 key.offset = btrfs_name_hash(name, name_len);
Josef Bacik5103e942007-11-16 11:45:54 -050075 path = btrfs_alloc_path();
76 if (!path)
77 return -ENOMEM;
Yan744f52f2008-01-14 13:26:08 -050078 if (name_len + data_len + sizeof(struct btrfs_dir_item) >
79 BTRFS_LEAF_DATA_SIZE(root) - sizeof(struct btrfs_item))
80 return -ENOSPC;
Josef Bacik5103e942007-11-16 11:45:54 -050081
82 data_size = sizeof(*dir_item) + name_len + data_len;
83 dir_item = insert_with_overflow(trans, root, path, &key, data_size,
84 name, name_len);
85 /*
86 * FIXME: at some point we should handle xattr's that are larger than
87 * what we can fit in our leaf. We set location to NULL b/c we arent
88 * pointing at anything else, that will change if we store the xattr
89 * data in a separate inode.
90 */
91 BUG_ON(IS_ERR(dir_item));
92 memset(&location, 0, sizeof(location));
93
94 leaf = path->nodes[0];
95 btrfs_cpu_key_to_disk(&disk_key, &location);
96 btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
97 btrfs_set_dir_type(leaf, dir_item, BTRFS_FT_XATTR);
98 btrfs_set_dir_name_len(leaf, dir_item, name_len);
99 btrfs_set_dir_data_len(leaf, dir_item, data_len);
100 name_ptr = (unsigned long)(dir_item + 1);
101 data_ptr = (unsigned long)((char *)name_ptr + name_len);
102
103 write_extent_buffer(leaf, name, name_ptr, name_len);
104 write_extent_buffer(leaf, data, data_ptr, data_len);
105 btrfs_mark_buffer_dirty(path->nodes[0]);
106
107 btrfs_free_path(path);
108 return ret;
109}
110
Chris Masone089f052007-03-16 16:20:31 -0400111int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
Chris Masond6e4a422007-04-06 15:37:36 -0400112 *root, const char *name, int name_len, u64 dir,
Josef Bacikaec74772008-07-24 12:12:38 -0400113 struct btrfs_key *location, u8 type, u64 index)
Chris Mason62e27492007-03-15 12:56:47 -0400114{
115 int ret = 0;
Chris Masone06afa82007-05-23 15:44:28 -0400116 int ret2 = 0;
Chris Mason5caf2a02007-04-02 11:20:42 -0400117 struct btrfs_path *path;
Chris Mason62e27492007-03-15 12:56:47 -0400118 struct btrfs_dir_item *dir_item;
Chris Mason5f39d392007-10-15 16:14:19 -0400119 struct extent_buffer *leaf;
120 unsigned long name_ptr;
Chris Mason62e27492007-03-15 12:56:47 -0400121 struct btrfs_key key;
Chris Mason5f39d392007-10-15 16:14:19 -0400122 struct btrfs_disk_key disk_key;
Chris Mason62e27492007-03-15 12:56:47 -0400123 u32 data_size;
124
125 key.objectid = dir;
Chris Mason1d4f6402007-03-15 15:18:43 -0400126 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
David Millerdf68b8a2008-02-15 10:40:52 -0500127 key.offset = btrfs_name_hash(name, name_len);
Chris Mason5caf2a02007-04-02 11:20:42 -0400128 path = btrfs_alloc_path();
Chris Mason62e27492007-03-15 12:56:47 -0400129 data_size = sizeof(*dir_item) + name_len;
Chris Masone06afa82007-05-23 15:44:28 -0400130 dir_item = insert_with_overflow(trans, root, path, &key, data_size,
131 name, name_len);
Chris Mason7e381802007-04-19 15:36:27 -0400132 if (IS_ERR(dir_item)) {
133 ret = PTR_ERR(dir_item);
Chris Masone06afa82007-05-23 15:44:28 -0400134 if (ret == -EEXIST)
135 goto second_insert;
Chris Mason62e27492007-03-15 12:56:47 -0400136 goto out;
Chris Mason7e381802007-04-19 15:36:27 -0400137 }
Chris Mason62e27492007-03-15 12:56:47 -0400138
Chris Mason5f39d392007-10-15 16:14:19 -0400139 leaf = path->nodes[0];
140 btrfs_cpu_key_to_disk(&disk_key, location);
141 btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
142 btrfs_set_dir_type(leaf, dir_item, type);
Josef Bacik5103e942007-11-16 11:45:54 -0500143 btrfs_set_dir_data_len(leaf, dir_item, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400144 btrfs_set_dir_name_len(leaf, dir_item, name_len);
145 name_ptr = (unsigned long)(dir_item + 1);
Chris Masonc5739bb2007-04-10 09:27:04 -0400146
Chris Mason5f39d392007-10-15 16:14:19 -0400147 write_extent_buffer(leaf, name, name_ptr, name_len);
148 btrfs_mark_buffer_dirty(leaf);
Chris Mason7e381802007-04-19 15:36:27 -0400149
Chris Masone06afa82007-05-23 15:44:28 -0400150second_insert:
Chris Mason7e381802007-04-19 15:36:27 -0400151 /* FIXME, use some real flag for selecting the extra index */
152 if (root == root->fs_info->tree_root) {
153 ret = 0;
154 goto out;
155 }
Chris Mason5caf2a02007-04-02 11:20:42 -0400156 btrfs_release_path(root, path);
Chris Mason7e381802007-04-19 15:36:27 -0400157
158 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
Josef Bacikaec74772008-07-24 12:12:38 -0400159 key.offset = index;
Chris Masone06afa82007-05-23 15:44:28 -0400160 dir_item = insert_with_overflow(trans, root, path, &key, data_size,
161 name, name_len);
Chris Mason7e381802007-04-19 15:36:27 -0400162 if (IS_ERR(dir_item)) {
Chris Masone06afa82007-05-23 15:44:28 -0400163 ret2 = PTR_ERR(dir_item);
Chris Mason7e381802007-04-19 15:36:27 -0400164 goto out;
165 }
Chris Mason5f39d392007-10-15 16:14:19 -0400166 leaf = path->nodes[0];
167 btrfs_cpu_key_to_disk(&disk_key, location);
168 btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
169 btrfs_set_dir_type(leaf, dir_item, type);
Josef Bacik5103e942007-11-16 11:45:54 -0500170 btrfs_set_dir_data_len(leaf, dir_item, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400171 btrfs_set_dir_name_len(leaf, dir_item, name_len);
172 name_ptr = (unsigned long)(dir_item + 1);
173 write_extent_buffer(leaf, name, name_ptr, name_len);
174 btrfs_mark_buffer_dirty(leaf);
Chris Mason7e381802007-04-19 15:36:27 -0400175out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400176 btrfs_free_path(path);
Chris Masone06afa82007-05-23 15:44:28 -0400177 if (ret)
178 return ret;
179 if (ret2)
180 return ret2;
181 return 0;
Chris Mason62e27492007-03-15 12:56:47 -0400182}
183
Chris Mason7e381802007-04-19 15:36:27 -0400184struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
185 struct btrfs_root *root,
186 struct btrfs_path *path, u64 dir,
187 const char *name, int name_len,
188 int mod)
Chris Mason62e27492007-03-15 12:56:47 -0400189{
Chris Mason1d4f6402007-03-15 15:18:43 -0400190 int ret;
Chris Mason62e27492007-03-15 12:56:47 -0400191 struct btrfs_key key;
Chris Mason1d4f6402007-03-15 15:18:43 -0400192 int ins_len = mod < 0 ? -1 : 0;
193 int cow = mod != 0;
Chris Mason5f39d392007-10-15 16:14:19 -0400194 struct btrfs_key found_key;
195 struct extent_buffer *leaf;
Chris Mason62e27492007-03-15 12:56:47 -0400196
197 key.objectid = dir;
Chris Mason1d4f6402007-03-15 15:18:43 -0400198 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
Chris Mason5f39d392007-10-15 16:14:19 -0400199
David Millerdf68b8a2008-02-15 10:40:52 -0500200 key.offset = btrfs_name_hash(name, name_len);
Chris Mason5f39d392007-10-15 16:14:19 -0400201
Chris Mason7e381802007-04-19 15:36:27 -0400202 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
203 if (ret < 0)
204 return ERR_PTR(ret);
205 if (ret > 0) {
206 if (path->slots[0] == 0)
207 return NULL;
208 path->slots[0]--;
Chris Mason7fcde0e2007-04-05 12:13:21 -0400209 }
Chris Mason7e381802007-04-19 15:36:27 -0400210
Chris Mason5f39d392007-10-15 16:14:19 -0400211 leaf = path->nodes[0];
212 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
213
214 if (found_key.objectid != dir ||
215 btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY ||
216 found_key.offset != key.offset)
Chris Mason7e381802007-04-19 15:36:27 -0400217 return NULL;
218
219 return btrfs_match_dir_item_name(root, path, name, name_len);
Chris Mason62e27492007-03-15 12:56:47 -0400220}
221
Chris Mason7e381802007-04-19 15:36:27 -0400222struct btrfs_dir_item *
223btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
224 struct btrfs_root *root,
225 struct btrfs_path *path, u64 dir,
226 u64 objectid, const char *name, int name_len,
227 int mod)
228{
229 int ret;
230 struct btrfs_key key;
231 int ins_len = mod < 0 ? -1 : 0;
232 int cow = mod != 0;
233
234 key.objectid = dir;
Chris Mason7e381802007-04-19 15:36:27 -0400235 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
236 key.offset = objectid;
237
238 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
239 if (ret < 0)
240 return ERR_PTR(ret);
241 if (ret > 0)
242 return ERR_PTR(-ENOENT);
243 return btrfs_match_dir_item_name(root, path, name, name_len);
244}
245
Josef Bacik5103e942007-11-16 11:45:54 -0500246struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
247 struct btrfs_root *root,
248 struct btrfs_path *path, u64 dir,
249 const char *name, u16 name_len,
250 int mod)
251{
252 int ret;
253 struct btrfs_key key;
254 int ins_len = mod < 0 ? -1 : 0;
255 int cow = mod != 0;
256 struct btrfs_key found_key;
257 struct extent_buffer *leaf;
258
259 key.objectid = dir;
260 btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
David Millerdf68b8a2008-02-15 10:40:52 -0500261 key.offset = btrfs_name_hash(name, name_len);
Josef Bacik5103e942007-11-16 11:45:54 -0500262 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
263 if (ret < 0)
264 return ERR_PTR(ret);
265 if (ret > 0) {
266 if (path->slots[0] == 0)
267 return NULL;
268 path->slots[0]--;
269 }
270
271 leaf = path->nodes[0];
272 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
273
274 if (found_key.objectid != dir ||
275 btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY ||
276 found_key.offset != key.offset)
277 return NULL;
278
279 return btrfs_match_dir_item_name(root, path, name, name_len);
280}
281
Chris Mason7e381802007-04-19 15:36:27 -0400282struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
Chris Mason7f5c1512007-03-23 15:56:19 -0400283 struct btrfs_path *path,
284 const char *name, int name_len)
Chris Mason62e27492007-03-15 12:56:47 -0400285{
Chris Mason62e27492007-03-15 12:56:47 -0400286 struct btrfs_dir_item *dir_item;
Chris Mason5f39d392007-10-15 16:14:19 -0400287 unsigned long name_ptr;
Chris Mason7e381802007-04-19 15:36:27 -0400288 u32 total_len;
289 u32 cur = 0;
290 u32 this_len;
Chris Mason5f39d392007-10-15 16:14:19 -0400291 struct extent_buffer *leaf;
Chris Masona8a2ee02007-03-16 08:46:49 -0400292
Chris Mason5f39d392007-10-15 16:14:19 -0400293 leaf = path->nodes[0];
Chris Mason7e381802007-04-19 15:36:27 -0400294 dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400295 total_len = btrfs_item_size_nr(leaf, path->slots[0]);
Chris Mason7e381802007-04-19 15:36:27 -0400296 while(cur < total_len) {
Chris Mason5f39d392007-10-15 16:14:19 -0400297 this_len = sizeof(*dir_item) +
Josef Bacik5103e942007-11-16 11:45:54 -0500298 btrfs_dir_name_len(leaf, dir_item) +
299 btrfs_dir_data_len(leaf, dir_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400300 name_ptr = (unsigned long)(dir_item + 1);
Chris Mason7e381802007-04-19 15:36:27 -0400301
Chris Mason5f39d392007-10-15 16:14:19 -0400302 if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
303 memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
Chris Mason7e381802007-04-19 15:36:27 -0400304 return dir_item;
305
306 cur += this_len;
307 dir_item = (struct btrfs_dir_item *)((char *)dir_item +
308 this_len);
309 }
310 return NULL;
Chris Mason62e27492007-03-15 12:56:47 -0400311}
Chris Mason7e381802007-04-19 15:36:27 -0400312
313int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
314 struct btrfs_root *root,
315 struct btrfs_path *path,
316 struct btrfs_dir_item *di)
317{
318
Chris Mason5f39d392007-10-15 16:14:19 -0400319 struct extent_buffer *leaf;
Chris Mason7e381802007-04-19 15:36:27 -0400320 u32 sub_item_len;
321 u32 item_len;
Chris Mason54aa1f42007-06-22 14:16:25 -0400322 int ret = 0;
Chris Mason7e381802007-04-19 15:36:27 -0400323
Chris Mason5f39d392007-10-15 16:14:19 -0400324 leaf = path->nodes[0];
Josef Bacik5103e942007-11-16 11:45:54 -0500325 sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) +
326 btrfs_dir_data_len(leaf, di);
Chris Mason5f39d392007-10-15 16:14:19 -0400327 item_len = btrfs_item_size_nr(leaf, path->slots[0]);
328 if (sub_item_len == item_len) {
Chris Mason7e381802007-04-19 15:36:27 -0400329 ret = btrfs_del_item(trans, root, path);
Chris Mason7e381802007-04-19 15:36:27 -0400330 } else {
Chris Mason5f39d392007-10-15 16:14:19 -0400331 /* MARKER */
332 unsigned long ptr = (unsigned long)di;
333 unsigned long start;
334
335 start = btrfs_item_ptr_offset(leaf, path->slots[0]);
336 memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
Chris Mason7e381802007-04-19 15:36:27 -0400337 item_len - (ptr + sub_item_len - start));
338 ret = btrfs_truncate_item(trans, root, path,
Chris Mason179e29e2007-11-01 11:28:41 -0400339 item_len - sub_item_len, 1);
Chris Mason7e381802007-04-19 15:36:27 -0400340 }
341 return 0;
342}
343