blob: e4f30090d640bf74b4ec99a1bdd7148a890d2883 [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);
Chris Masone02119d2008-09-05 16:13:11 -040099 btrfs_set_dir_transid(leaf, dir_item, trans->transid);
Josef Bacik5103e942007-11-16 11:45:54 -0500100 btrfs_set_dir_data_len(leaf, dir_item, data_len);
101 name_ptr = (unsigned long)(dir_item + 1);
102 data_ptr = (unsigned long)((char *)name_ptr + name_len);
103
104 write_extent_buffer(leaf, name, name_ptr, name_len);
105 write_extent_buffer(leaf, data, data_ptr, data_len);
106 btrfs_mark_buffer_dirty(path->nodes[0]);
107
108 btrfs_free_path(path);
109 return ret;
110}
111
Chris Masone089f052007-03-16 16:20:31 -0400112int btrfs_insert_dir_item(struct btrfs_trans_handle *trans, struct btrfs_root
Chris Masond6e4a422007-04-06 15:37:36 -0400113 *root, const char *name, int name_len, u64 dir,
Josef Bacikaec74772008-07-24 12:12:38 -0400114 struct btrfs_key *location, u8 type, u64 index)
Chris Mason62e27492007-03-15 12:56:47 -0400115{
116 int ret = 0;
Chris Masone06afa82007-05-23 15:44:28 -0400117 int ret2 = 0;
Chris Mason5caf2a02007-04-02 11:20:42 -0400118 struct btrfs_path *path;
Chris Mason62e27492007-03-15 12:56:47 -0400119 struct btrfs_dir_item *dir_item;
Chris Mason5f39d392007-10-15 16:14:19 -0400120 struct extent_buffer *leaf;
121 unsigned long name_ptr;
Chris Mason62e27492007-03-15 12:56:47 -0400122 struct btrfs_key key;
Chris Mason5f39d392007-10-15 16:14:19 -0400123 struct btrfs_disk_key disk_key;
Chris Mason62e27492007-03-15 12:56:47 -0400124 u32 data_size;
125
126 key.objectid = dir;
Chris Mason1d4f6402007-03-15 15:18:43 -0400127 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
David Millerdf68b8a2008-02-15 10:40:52 -0500128 key.offset = btrfs_name_hash(name, name_len);
Chris Mason5caf2a02007-04-02 11:20:42 -0400129 path = btrfs_alloc_path();
Chris Mason62e27492007-03-15 12:56:47 -0400130 data_size = sizeof(*dir_item) + name_len;
Chris Masone06afa82007-05-23 15:44:28 -0400131 dir_item = insert_with_overflow(trans, root, path, &key, data_size,
132 name, name_len);
Chris Mason7e381802007-04-19 15:36:27 -0400133 if (IS_ERR(dir_item)) {
134 ret = PTR_ERR(dir_item);
Chris Masone06afa82007-05-23 15:44:28 -0400135 if (ret == -EEXIST)
136 goto second_insert;
Chris Mason62e27492007-03-15 12:56:47 -0400137 goto out;
Chris Mason7e381802007-04-19 15:36:27 -0400138 }
Chris Mason62e27492007-03-15 12:56:47 -0400139
Chris Mason5f39d392007-10-15 16:14:19 -0400140 leaf = path->nodes[0];
141 btrfs_cpu_key_to_disk(&disk_key, location);
142 btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
143 btrfs_set_dir_type(leaf, dir_item, type);
Josef Bacik5103e942007-11-16 11:45:54 -0500144 btrfs_set_dir_data_len(leaf, dir_item, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400145 btrfs_set_dir_name_len(leaf, dir_item, name_len);
Chris Masone02119d2008-09-05 16:13:11 -0400146 btrfs_set_dir_transid(leaf, dir_item, trans->transid);
Chris Mason5f39d392007-10-15 16:14:19 -0400147 name_ptr = (unsigned long)(dir_item + 1);
Chris Masonc5739bb2007-04-10 09:27:04 -0400148
Chris Mason5f39d392007-10-15 16:14:19 -0400149 write_extent_buffer(leaf, name, name_ptr, name_len);
150 btrfs_mark_buffer_dirty(leaf);
Chris Mason7e381802007-04-19 15:36:27 -0400151
Chris Masone06afa82007-05-23 15:44:28 -0400152second_insert:
Chris Mason7e381802007-04-19 15:36:27 -0400153 /* FIXME, use some real flag for selecting the extra index */
154 if (root == root->fs_info->tree_root) {
155 ret = 0;
156 goto out;
157 }
Chris Mason5caf2a02007-04-02 11:20:42 -0400158 btrfs_release_path(root, path);
Chris Mason7e381802007-04-19 15:36:27 -0400159
160 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
Josef Bacikaec74772008-07-24 12:12:38 -0400161 key.offset = index;
Chris Masone06afa82007-05-23 15:44:28 -0400162 dir_item = insert_with_overflow(trans, root, path, &key, data_size,
163 name, name_len);
Chris Mason7e381802007-04-19 15:36:27 -0400164 if (IS_ERR(dir_item)) {
Chris Masone06afa82007-05-23 15:44:28 -0400165 ret2 = PTR_ERR(dir_item);
Chris Mason7e381802007-04-19 15:36:27 -0400166 goto out;
167 }
Chris Mason5f39d392007-10-15 16:14:19 -0400168 leaf = path->nodes[0];
169 btrfs_cpu_key_to_disk(&disk_key, location);
170 btrfs_set_dir_item_key(leaf, dir_item, &disk_key);
171 btrfs_set_dir_type(leaf, dir_item, type);
Josef Bacik5103e942007-11-16 11:45:54 -0500172 btrfs_set_dir_data_len(leaf, dir_item, 0);
Chris Mason5f39d392007-10-15 16:14:19 -0400173 btrfs_set_dir_name_len(leaf, dir_item, name_len);
Chris Masone02119d2008-09-05 16:13:11 -0400174 btrfs_set_dir_transid(leaf, dir_item, trans->transid);
Chris Mason5f39d392007-10-15 16:14:19 -0400175 name_ptr = (unsigned long)(dir_item + 1);
176 write_extent_buffer(leaf, name, name_ptr, name_len);
177 btrfs_mark_buffer_dirty(leaf);
Chris Mason7e381802007-04-19 15:36:27 -0400178out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400179 btrfs_free_path(path);
Chris Masone06afa82007-05-23 15:44:28 -0400180 if (ret)
181 return ret;
182 if (ret2)
183 return ret2;
184 return 0;
Chris Mason62e27492007-03-15 12:56:47 -0400185}
186
Chris Mason7e381802007-04-19 15:36:27 -0400187struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
188 struct btrfs_root *root,
189 struct btrfs_path *path, u64 dir,
190 const char *name, int name_len,
191 int mod)
Chris Mason62e27492007-03-15 12:56:47 -0400192{
Chris Mason1d4f6402007-03-15 15:18:43 -0400193 int ret;
Chris Mason62e27492007-03-15 12:56:47 -0400194 struct btrfs_key key;
Chris Mason1d4f6402007-03-15 15:18:43 -0400195 int ins_len = mod < 0 ? -1 : 0;
196 int cow = mod != 0;
Chris Mason5f39d392007-10-15 16:14:19 -0400197 struct btrfs_key found_key;
198 struct extent_buffer *leaf;
Chris Mason62e27492007-03-15 12:56:47 -0400199
200 key.objectid = dir;
Chris Mason1d4f6402007-03-15 15:18:43 -0400201 btrfs_set_key_type(&key, BTRFS_DIR_ITEM_KEY);
Chris Mason5f39d392007-10-15 16:14:19 -0400202
David Millerdf68b8a2008-02-15 10:40:52 -0500203 key.offset = btrfs_name_hash(name, name_len);
Chris Mason5f39d392007-10-15 16:14:19 -0400204
Chris Mason7e381802007-04-19 15:36:27 -0400205 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
206 if (ret < 0)
207 return ERR_PTR(ret);
208 if (ret > 0) {
209 if (path->slots[0] == 0)
210 return NULL;
211 path->slots[0]--;
Chris Mason7fcde0e2007-04-05 12:13:21 -0400212 }
Chris Mason7e381802007-04-19 15:36:27 -0400213
Chris Mason5f39d392007-10-15 16:14:19 -0400214 leaf = path->nodes[0];
215 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
216
217 if (found_key.objectid != dir ||
218 btrfs_key_type(&found_key) != BTRFS_DIR_ITEM_KEY ||
219 found_key.offset != key.offset)
Chris Mason7e381802007-04-19 15:36:27 -0400220 return NULL;
221
222 return btrfs_match_dir_item_name(root, path, name, name_len);
Chris Mason62e27492007-03-15 12:56:47 -0400223}
224
Chris Mason7e381802007-04-19 15:36:27 -0400225struct btrfs_dir_item *
226btrfs_lookup_dir_index_item(struct btrfs_trans_handle *trans,
227 struct btrfs_root *root,
228 struct btrfs_path *path, u64 dir,
229 u64 objectid, const char *name, int name_len,
230 int mod)
231{
232 int ret;
233 struct btrfs_key key;
234 int ins_len = mod < 0 ? -1 : 0;
235 int cow = mod != 0;
236
237 key.objectid = dir;
Chris Mason7e381802007-04-19 15:36:27 -0400238 btrfs_set_key_type(&key, BTRFS_DIR_INDEX_KEY);
239 key.offset = objectid;
240
241 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
242 if (ret < 0)
243 return ERR_PTR(ret);
244 if (ret > 0)
245 return ERR_PTR(-ENOENT);
246 return btrfs_match_dir_item_name(root, path, name, name_len);
247}
248
Josef Bacik5103e942007-11-16 11:45:54 -0500249struct btrfs_dir_item *btrfs_lookup_xattr(struct btrfs_trans_handle *trans,
250 struct btrfs_root *root,
251 struct btrfs_path *path, u64 dir,
252 const char *name, u16 name_len,
253 int mod)
254{
255 int ret;
256 struct btrfs_key key;
257 int ins_len = mod < 0 ? -1 : 0;
258 int cow = mod != 0;
259 struct btrfs_key found_key;
260 struct extent_buffer *leaf;
261
262 key.objectid = dir;
263 btrfs_set_key_type(&key, BTRFS_XATTR_ITEM_KEY);
David Millerdf68b8a2008-02-15 10:40:52 -0500264 key.offset = btrfs_name_hash(name, name_len);
Josef Bacik5103e942007-11-16 11:45:54 -0500265 ret = btrfs_search_slot(trans, root, &key, path, ins_len, cow);
266 if (ret < 0)
267 return ERR_PTR(ret);
268 if (ret > 0) {
269 if (path->slots[0] == 0)
270 return NULL;
271 path->slots[0]--;
272 }
273
274 leaf = path->nodes[0];
275 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
276
277 if (found_key.objectid != dir ||
278 btrfs_key_type(&found_key) != BTRFS_XATTR_ITEM_KEY ||
279 found_key.offset != key.offset)
280 return NULL;
281
282 return btrfs_match_dir_item_name(root, path, name, name_len);
283}
284
Chris Mason7e381802007-04-19 15:36:27 -0400285struct btrfs_dir_item *btrfs_match_dir_item_name(struct btrfs_root *root,
Chris Mason7f5c1512007-03-23 15:56:19 -0400286 struct btrfs_path *path,
287 const char *name, int name_len)
Chris Mason62e27492007-03-15 12:56:47 -0400288{
Chris Mason62e27492007-03-15 12:56:47 -0400289 struct btrfs_dir_item *dir_item;
Chris Mason5f39d392007-10-15 16:14:19 -0400290 unsigned long name_ptr;
Chris Mason7e381802007-04-19 15:36:27 -0400291 u32 total_len;
292 u32 cur = 0;
293 u32 this_len;
Chris Mason5f39d392007-10-15 16:14:19 -0400294 struct extent_buffer *leaf;
Chris Masona8a2ee02007-03-16 08:46:49 -0400295
Chris Mason5f39d392007-10-15 16:14:19 -0400296 leaf = path->nodes[0];
Chris Mason7e381802007-04-19 15:36:27 -0400297 dir_item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dir_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400298 total_len = btrfs_item_size_nr(leaf, path->slots[0]);
Chris Mason7e381802007-04-19 15:36:27 -0400299 while(cur < total_len) {
Chris Mason5f39d392007-10-15 16:14:19 -0400300 this_len = sizeof(*dir_item) +
Josef Bacik5103e942007-11-16 11:45:54 -0500301 btrfs_dir_name_len(leaf, dir_item) +
302 btrfs_dir_data_len(leaf, dir_item);
Chris Mason5f39d392007-10-15 16:14:19 -0400303 name_ptr = (unsigned long)(dir_item + 1);
Chris Mason7e381802007-04-19 15:36:27 -0400304
Chris Mason5f39d392007-10-15 16:14:19 -0400305 if (btrfs_dir_name_len(leaf, dir_item) == name_len &&
306 memcmp_extent_buffer(leaf, name, name_ptr, name_len) == 0)
Chris Mason7e381802007-04-19 15:36:27 -0400307 return dir_item;
308
309 cur += this_len;
310 dir_item = (struct btrfs_dir_item *)((char *)dir_item +
311 this_len);
312 }
313 return NULL;
Chris Mason62e27492007-03-15 12:56:47 -0400314}
Chris Mason7e381802007-04-19 15:36:27 -0400315
316int btrfs_delete_one_dir_name(struct btrfs_trans_handle *trans,
317 struct btrfs_root *root,
318 struct btrfs_path *path,
319 struct btrfs_dir_item *di)
320{
321
Chris Mason5f39d392007-10-15 16:14:19 -0400322 struct extent_buffer *leaf;
Chris Mason7e381802007-04-19 15:36:27 -0400323 u32 sub_item_len;
324 u32 item_len;
Chris Mason54aa1f42007-06-22 14:16:25 -0400325 int ret = 0;
Chris Mason7e381802007-04-19 15:36:27 -0400326
Chris Mason5f39d392007-10-15 16:14:19 -0400327 leaf = path->nodes[0];
Josef Bacik5103e942007-11-16 11:45:54 -0500328 sub_item_len = sizeof(*di) + btrfs_dir_name_len(leaf, di) +
329 btrfs_dir_data_len(leaf, di);
Chris Mason5f39d392007-10-15 16:14:19 -0400330 item_len = btrfs_item_size_nr(leaf, path->slots[0]);
331 if (sub_item_len == item_len) {
Chris Mason7e381802007-04-19 15:36:27 -0400332 ret = btrfs_del_item(trans, root, path);
Chris Mason7e381802007-04-19 15:36:27 -0400333 } else {
Chris Mason5f39d392007-10-15 16:14:19 -0400334 /* MARKER */
335 unsigned long ptr = (unsigned long)di;
336 unsigned long start;
337
338 start = btrfs_item_ptr_offset(leaf, path->slots[0]);
339 memmove_extent_buffer(leaf, ptr, ptr + sub_item_len,
Chris Mason7e381802007-04-19 15:36:27 -0400340 item_len - (ptr + sub_item_len - start));
341 ret = btrfs_truncate_item(trans, root, path,
Chris Mason179e29e2007-11-01 11:28:41 -0400342 item_len - sub_item_len, 1);
Chris Mason7e381802007-04-19 15:36:27 -0400343 }
344 return 0;
345}