blob: 1389b69059de3ba33dcccbcb9474fa7d6537afd1 [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
Alexander Block8ea05e32012-07-25 17:35:53 +020019#include <linux/uuid.h>
Chris Mason3768f362007-03-13 16:47:54 -040020#include "ctree.h"
Chris Mason5eda7b52007-06-22 14:16:25 -040021#include "transaction.h"
Chris Mason3768f362007-03-13 16:47:54 -040022#include "disk-io.h"
23#include "print-tree.h"
24
Chris Masonbf4ef672008-05-08 13:26:18 -040025/*
Alexander Block8ea05e32012-07-25 17:35:53 +020026 * Read a root item from the tree. In case we detect a root item smaller then
27 * sizeof(root_item), we know it's an old version of the root structure and
28 * initialize all new fields to zero. The same happens if we detect mismatching
29 * generation numbers as then we know the root was once mounted with an older
30 * kernel that was not aware of the root item structure change.
31 */
Sergei Trofimovich171170c2013-08-14 23:27:46 +030032static void btrfs_read_root_item(struct extent_buffer *eb, int slot,
33 struct btrfs_root_item *item)
Alexander Block8ea05e32012-07-25 17:35:53 +020034{
35 uuid_le uuid;
36 int len;
37 int need_reset = 0;
38
39 len = btrfs_item_size_nr(eb, slot);
40 read_extent_buffer(eb, item, btrfs_item_ptr_offset(eb, slot),
41 min_t(int, len, (int)sizeof(*item)));
42 if (len < sizeof(*item))
43 need_reset = 1;
44 if (!need_reset && btrfs_root_generation(item)
45 != btrfs_root_generation_v2(item)) {
46 if (btrfs_root_generation_v2(item) != 0) {
Frank Holtonefe120a2013-12-20 11:37:06 -050047 printk(KERN_WARNING "BTRFS: mismatching "
Alexander Block8ea05e32012-07-25 17:35:53 +020048 "generation and generation_v2 "
49 "found in root item. This root "
50 "was probably mounted with an "
51 "older kernel. Resetting all "
52 "new fields.\n");
53 }
54 need_reset = 1;
55 }
56 if (need_reset) {
57 memset(&item->generation_v2, 0,
58 sizeof(*item) - offsetof(struct btrfs_root_item,
59 generation_v2));
60
61 uuid_le_gen(&uuid);
62 memcpy(item->uuid, uuid.b, BTRFS_UUID_SIZE);
63 }
64}
65
66/*
Miao Xiecb517ea2013-05-15 07:48:19 +000067 * btrfs_find_root - lookup the root by the key.
68 * root: the root of the root tree
69 * search_key: the key to search
70 * path: the path we search
71 * root_item: the root item of the tree we look for
72 * root_key: the reak key of the tree we look for
73 *
74 * If ->offset of 'seach_key' is -1ULL, it means we are not sure the offset
75 * of the search key, just lookup the root with the highest offset for a
76 * given objectid.
77 *
78 * If we find something return 0, otherwise > 0, < 0 on error.
Chris Masond352ac62008-09-29 15:18:18 -040079 */
Miao Xiecb517ea2013-05-15 07:48:19 +000080int btrfs_find_root(struct btrfs_root *root, struct btrfs_key *search_key,
81 struct btrfs_path *path, struct btrfs_root_item *root_item,
82 struct btrfs_key *root_key)
Chris Mason3768f362007-03-13 16:47:54 -040083{
Chris Mason5f39d392007-10-15 16:14:19 -040084 struct btrfs_key found_key;
85 struct extent_buffer *l;
Chris Mason3768f362007-03-13 16:47:54 -040086 int ret;
87 int slot;
88
Miao Xiecb517ea2013-05-15 07:48:19 +000089 ret = btrfs_search_slot(NULL, root, search_key, path, 0, 0);
Chris Mason3768f362007-03-13 16:47:54 -040090 if (ret < 0)
Miao Xiecb517ea2013-05-15 07:48:19 +000091 return ret;
Chris Mason5f39d392007-10-15 16:14:19 -040092
Miao Xiecb517ea2013-05-15 07:48:19 +000093 if (search_key->offset != -1ULL) { /* the search key is exact */
94 if (ret > 0)
95 goto out;
96 } else {
97 BUG_ON(ret == 0); /* Logical error */
98 if (path->slots[0] == 0)
99 goto out;
100 path->slots[0]--;
101 ret = 0;
Chris Mason3768f362007-03-13 16:47:54 -0400102 }
Miao Xiecb517ea2013-05-15 07:48:19 +0000103
Yan, Zheng76dda932009-09-21 16:00:26 -0400104 l = path->nodes[0];
Miao Xiecb517ea2013-05-15 07:48:19 +0000105 slot = path->slots[0];
106
Yan, Zheng76dda932009-09-21 16:00:26 -0400107 btrfs_item_key_to_cpu(l, &found_key, slot);
Miao Xiecb517ea2013-05-15 07:48:19 +0000108 if (found_key.objectid != search_key->objectid ||
Yan, Zheng76dda932009-09-21 16:00:26 -0400109 found_key.type != BTRFS_ROOT_ITEM_KEY) {
110 ret = 1;
111 goto out;
112 }
Alexander Block8ea05e32012-07-25 17:35:53 +0200113
Miao Xiecb517ea2013-05-15 07:48:19 +0000114 if (root_item)
115 btrfs_read_root_item(l, slot, root_item);
116 if (root_key)
117 memcpy(root_key, &found_key, sizeof(found_key));
Chris Mason3768f362007-03-13 16:47:54 -0400118out:
Miao Xiecb517ea2013-05-15 07:48:19 +0000119 btrfs_release_path(path);
Chris Mason3768f362007-03-13 16:47:54 -0400120 return ret;
121}
122
Mark Fashehbf5f32e2011-07-14 21:23:06 +0000123void btrfs_set_root_node(struct btrfs_root_item *item,
124 struct extent_buffer *node)
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400125{
126 btrfs_set_root_bytenr(item, node->start);
127 btrfs_set_root_level(item, btrfs_header_level(node));
128 btrfs_set_root_generation(item, btrfs_header_generation(node));
Yan Zheng5d4f98a2009-06-10 10:45:14 -0400129}
130
Chris Masond352ac62008-09-29 15:18:18 -0400131/*
132 * copy the data in 'item' into the btree
133 */
Chris Masone089f052007-03-16 16:20:31 -0400134int btrfs_update_root(struct btrfs_trans_handle *trans, struct btrfs_root
135 *root, struct btrfs_key *key, struct btrfs_root_item
136 *item)
Chris Mason3768f362007-03-13 16:47:54 -0400137{
Chris Mason5caf2a02007-04-02 11:20:42 -0400138 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -0400139 struct extent_buffer *l;
Chris Mason3768f362007-03-13 16:47:54 -0400140 int ret;
141 int slot;
Chris Mason5f39d392007-10-15 16:14:19 -0400142 unsigned long ptr;
Alexander Block8ea05e32012-07-25 17:35:53 +0200143 int old_len;
Chris Mason3768f362007-03-13 16:47:54 -0400144
Chris Mason5caf2a02007-04-02 11:20:42 -0400145 path = btrfs_alloc_path();
Jeff Mahoneyb45a9d82011-10-03 23:22:44 -0400146 if (!path)
147 return -ENOMEM;
148
Chris Mason5caf2a02007-04-02 11:20:42 -0400149 ret = btrfs_search_slot(trans, root, key, path, 0, 1);
David Sterba005d6422012-09-18 07:52:32 -0600150 if (ret < 0) {
151 btrfs_abort_transaction(trans, root, ret);
152 goto out;
153 }
Chris Masond6667462008-01-03 14:51:00 -0500154
155 if (ret != 0) {
156 btrfs_print_leaf(root, path->nodes[0]);
Frank Holtonefe120a2013-12-20 11:37:06 -0500157 btrfs_crit(root->fs_info, "unable to update root key %llu %u %llu",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +0200158 key->objectid, key->type, key->offset);
Chris Masond6667462008-01-03 14:51:00 -0500159 BUG_ON(1);
160 }
161
Chris Mason5f39d392007-10-15 16:14:19 -0400162 l = path->nodes[0];
Chris Mason5caf2a02007-04-02 11:20:42 -0400163 slot = path->slots[0];
Chris Mason5f39d392007-10-15 16:14:19 -0400164 ptr = btrfs_item_ptr_offset(l, slot);
Alexander Block8ea05e32012-07-25 17:35:53 +0200165 old_len = btrfs_item_size_nr(l, slot);
166
167 /*
168 * If this is the first time we update the root item which originated
169 * from an older kernel, we need to enlarge the item size to make room
170 * for the added fields.
171 */
172 if (old_len < sizeof(*item)) {
173 btrfs_release_path(path);
174 ret = btrfs_search_slot(trans, root, key, path,
175 -1, 1);
David Sterba005d6422012-09-18 07:52:32 -0600176 if (ret < 0) {
177 btrfs_abort_transaction(trans, root, ret);
178 goto out;
179 }
180
Alexander Block8ea05e32012-07-25 17:35:53 +0200181 ret = btrfs_del_item(trans, root, path);
David Sterba005d6422012-09-18 07:52:32 -0600182 if (ret < 0) {
183 btrfs_abort_transaction(trans, root, ret);
184 goto out;
185 }
Alexander Block8ea05e32012-07-25 17:35:53 +0200186 btrfs_release_path(path);
187 ret = btrfs_insert_empty_item(trans, root, path,
188 key, sizeof(*item));
David Sterba005d6422012-09-18 07:52:32 -0600189 if (ret < 0) {
190 btrfs_abort_transaction(trans, root, ret);
191 goto out;
192 }
Alexander Block8ea05e32012-07-25 17:35:53 +0200193 l = path->nodes[0];
194 slot = path->slots[0];
195 ptr = btrfs_item_ptr_offset(l, slot);
196 }
197
198 /*
199 * Update generation_v2 so at the next mount we know the new root
200 * fields are valid.
201 */
202 btrfs_set_root_generation_v2(item, btrfs_root_generation(item));
203
Chris Mason5f39d392007-10-15 16:14:19 -0400204 write_extent_buffer(l, item, ptr, sizeof(*item));
Chris Mason5caf2a02007-04-02 11:20:42 -0400205 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Mason3768f362007-03-13 16:47:54 -0400206out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400207 btrfs_free_path(path);
Chris Mason3768f362007-03-13 16:47:54 -0400208 return ret;
209}
210
Jeff Mahoneyd16cb052011-10-03 23:22:34 -0400211int btrfs_insert_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
212 struct btrfs_key *key, struct btrfs_root_item *item)
Chris Mason3768f362007-03-13 16:47:54 -0400213{
Alexander Block8ea05e32012-07-25 17:35:53 +0200214 /*
215 * Make sure generation v1 and v2 match. See update_root for details.
216 */
217 btrfs_set_root_generation_v2(item, btrfs_root_generation(item));
Jeff Mahoneyd16cb052011-10-03 23:22:34 -0400218 return btrfs_insert_item(trans, root, key, item, sizeof(*item));
Chris Mason3768f362007-03-13 16:47:54 -0400219}
220
Yan, Zheng76dda932009-09-21 16:00:26 -0400221int btrfs_find_orphan_roots(struct btrfs_root *tree_root)
222{
223 struct extent_buffer *leaf;
224 struct btrfs_path *path;
225 struct btrfs_key key;
Yan, Zhengd68fc572010-05-16 10:49:58 -0400226 struct btrfs_key root_key;
227 struct btrfs_root *root;
Yan, Zheng76dda932009-09-21 16:00:26 -0400228 int err = 0;
229 int ret;
Josef Bacik68a73422013-06-27 11:32:16 -0400230 bool can_recover = true;
231
232 if (tree_root->fs_info->sb->s_flags & MS_RDONLY)
233 can_recover = false;
Yan, Zheng76dda932009-09-21 16:00:26 -0400234
235 path = btrfs_alloc_path();
236 if (!path)
237 return -ENOMEM;
238
239 key.objectid = BTRFS_ORPHAN_OBJECTID;
240 key.type = BTRFS_ORPHAN_ITEM_KEY;
241 key.offset = 0;
242
Yan, Zhengd68fc572010-05-16 10:49:58 -0400243 root_key.type = BTRFS_ROOT_ITEM_KEY;
244 root_key.offset = (u64)-1;
245
Yan, Zheng76dda932009-09-21 16:00:26 -0400246 while (1) {
247 ret = btrfs_search_slot(NULL, tree_root, &key, path, 0, 0);
248 if (ret < 0) {
249 err = ret;
250 break;
251 }
252
253 leaf = path->nodes[0];
254 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
255 ret = btrfs_next_leaf(tree_root, path);
256 if (ret < 0)
257 err = ret;
258 if (ret != 0)
259 break;
260 leaf = path->nodes[0];
261 }
262
263 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
David Sterbab3b4aa72011-04-21 01:20:15 +0200264 btrfs_release_path(path);
Yan, Zheng76dda932009-09-21 16:00:26 -0400265
266 if (key.objectid != BTRFS_ORPHAN_OBJECTID ||
267 key.type != BTRFS_ORPHAN_ITEM_KEY)
268 break;
269
Yan, Zhengd68fc572010-05-16 10:49:58 -0400270 root_key.objectid = key.offset;
271 key.offset++;
272
Miao Xiecb517ea2013-05-15 07:48:19 +0000273 root = btrfs_read_fs_root(tree_root, &root_key);
Josef Bacik68a73422013-06-27 11:32:16 -0400274 err = PTR_RET(root);
275 if (err && err != -ENOENT) {
Yan, Zheng76dda932009-09-21 16:00:26 -0400276 break;
Josef Bacik68a73422013-06-27 11:32:16 -0400277 } else if (err == -ENOENT) {
278 struct btrfs_trans_handle *trans;
279
280 btrfs_release_path(path);
281
282 trans = btrfs_join_transaction(tree_root);
283 if (IS_ERR(trans)) {
284 err = PTR_ERR(trans);
285 btrfs_error(tree_root->fs_info, err,
286 "Failed to start trans to delete "
287 "orphan item");
288 break;
289 }
290 err = btrfs_del_orphan_item(trans, tree_root,
291 root_key.objectid);
292 btrfs_end_transaction(trans, tree_root);
293 if (err) {
294 btrfs_error(tree_root->fs_info, err,
295 "Failed to delete root orphan "
296 "item");
297 break;
298 }
299 continue;
Yan, Zheng76dda932009-09-21 16:00:26 -0400300 }
301
Miao Xiecb517ea2013-05-15 07:48:19 +0000302 err = btrfs_init_fs_root(root);
303 if (err) {
304 btrfs_free_fs_root(root);
305 break;
306 }
307
308 root->orphan_item_inserted = 1;
309
310 err = btrfs_insert_fs_root(root->fs_info, root);
311 if (err) {
312 BUG_ON(err == -EEXIST);
313 btrfs_free_fs_root(root);
Yan, Zhengd68fc572010-05-16 10:49:58 -0400314 break;
315 }
Miao Xie14927d92013-09-25 21:47:43 +0800316
317 if (btrfs_root_refs(&root->root_item) == 0)
318 btrfs_add_dead_root(root);
Yan, Zheng76dda932009-09-21 16:00:26 -0400319 }
320
321 btrfs_free_path(path);
322 return err;
323}
324
Chris Masond352ac62008-09-29 15:18:18 -0400325/* drop the root item for 'key' from 'root' */
Chris Masone089f052007-03-16 16:20:31 -0400326int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root,
327 struct btrfs_key *key)
Chris Mason3768f362007-03-13 16:47:54 -0400328{
Chris Mason5caf2a02007-04-02 11:20:42 -0400329 struct btrfs_path *path;
Chris Mason3768f362007-03-13 16:47:54 -0400330 int ret;
331
Chris Mason5caf2a02007-04-02 11:20:42 -0400332 path = btrfs_alloc_path();
Tsutomu Itohdb5b4932011-03-23 08:14:16 +0000333 if (!path)
334 return -ENOMEM;
Chris Mason5caf2a02007-04-02 11:20:42 -0400335 ret = btrfs_search_slot(trans, root, key, path, -1, 1);
Chris Mason3768f362007-03-13 16:47:54 -0400336 if (ret < 0)
337 goto out;
Chris Masonedbd8d42007-12-21 16:27:24 -0500338
Chris Mason3768f362007-03-13 16:47:54 -0400339 BUG_ON(ret != 0);
Chris Masonc5739bb2007-04-10 09:27:04 -0400340
Chris Mason5eda7b52007-06-22 14:16:25 -0400341 ret = btrfs_del_item(trans, root, path);
Chris Mason3768f362007-03-13 16:47:54 -0400342out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400343 btrfs_free_path(path);
Chris Mason3768f362007-03-13 16:47:54 -0400344 return ret;
345}
Chris Mason0660b5a2008-11-17 20:37:39 -0500346
347int btrfs_del_root_ref(struct btrfs_trans_handle *trans,
348 struct btrfs_root *tree_root,
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400349 u64 root_id, u64 ref_id, u64 dirid, u64 *sequence,
350 const char *name, int name_len)
351
Chris Mason0660b5a2008-11-17 20:37:39 -0500352{
Chris Mason0660b5a2008-11-17 20:37:39 -0500353 struct btrfs_path *path;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400354 struct btrfs_root_ref *ref;
355 struct extent_buffer *leaf;
356 struct btrfs_key key;
357 unsigned long ptr;
358 int err = 0;
359 int ret;
Chris Mason0660b5a2008-11-17 20:37:39 -0500360
361 path = btrfs_alloc_path();
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400362 if (!path)
363 return -ENOMEM;
Chris Mason0660b5a2008-11-17 20:37:39 -0500364
365 key.objectid = root_id;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400366 key.type = BTRFS_ROOT_BACKREF_KEY;
Chris Mason0660b5a2008-11-17 20:37:39 -0500367 key.offset = ref_id;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400368again:
Chris Mason0660b5a2008-11-17 20:37:39 -0500369 ret = btrfs_search_slot(trans, tree_root, &key, path, -1, 1);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400370 BUG_ON(ret < 0);
371 if (ret == 0) {
372 leaf = path->nodes[0];
373 ref = btrfs_item_ptr(leaf, path->slots[0],
374 struct btrfs_root_ref);
Chris Mason0660b5a2008-11-17 20:37:39 -0500375
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400376 WARN_ON(btrfs_root_ref_dirid(leaf, ref) != dirid);
377 WARN_ON(btrfs_root_ref_name_len(leaf, ref) != name_len);
378 ptr = (unsigned long)(ref + 1);
379 WARN_ON(memcmp_extent_buffer(leaf, name, ptr, name_len));
380 *sequence = btrfs_root_ref_sequence(leaf, ref);
381
382 ret = btrfs_del_item(trans, tree_root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000383 if (ret) {
384 err = ret;
385 goto out;
386 }
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400387 } else
388 err = -ENOENT;
389
390 if (key.type == BTRFS_ROOT_BACKREF_KEY) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200391 btrfs_release_path(path);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400392 key.objectid = ref_id;
393 key.type = BTRFS_ROOT_REF_KEY;
394 key.offset = root_id;
395 goto again;
396 }
Chris Mason0660b5a2008-11-17 20:37:39 -0500397
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000398out:
Chris Mason0660b5a2008-11-17 20:37:39 -0500399 btrfs_free_path(path);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400400 return err;
Chris Mason0660b5a2008-11-17 20:37:39 -0500401}
402
403/*
404 * add a btrfs_root_ref item. type is either BTRFS_ROOT_REF_KEY
405 * or BTRFS_ROOT_BACKREF_KEY.
406 *
407 * The dirid, sequence, name and name_len refer to the directory entry
408 * that is referencing the root.
409 *
410 * For a forward ref, the root_id is the id of the tree referencing
411 * the root and ref_id is the id of the subvol or snapshot.
412 *
413 * For a back ref the root_id is the id of the subvol or snapshot and
414 * ref_id is the id of the tree referencing it.
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100415 *
416 * Will return 0, -ENOMEM, or anything from the CoW path
Chris Mason0660b5a2008-11-17 20:37:39 -0500417 */
418int btrfs_add_root_ref(struct btrfs_trans_handle *trans,
419 struct btrfs_root *tree_root,
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400420 u64 root_id, u64 ref_id, u64 dirid, u64 sequence,
Chris Mason0660b5a2008-11-17 20:37:39 -0500421 const char *name, int name_len)
422{
423 struct btrfs_key key;
424 int ret;
425 struct btrfs_path *path;
426 struct btrfs_root_ref *ref;
427 struct extent_buffer *leaf;
428 unsigned long ptr;
429
Chris Mason0660b5a2008-11-17 20:37:39 -0500430 path = btrfs_alloc_path();
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400431 if (!path)
432 return -ENOMEM;
Chris Mason0660b5a2008-11-17 20:37:39 -0500433
434 key.objectid = root_id;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400435 key.type = BTRFS_ROOT_BACKREF_KEY;
Chris Mason0660b5a2008-11-17 20:37:39 -0500436 key.offset = ref_id;
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400437again:
Chris Mason0660b5a2008-11-17 20:37:39 -0500438 ret = btrfs_insert_empty_item(trans, tree_root, path, &key,
439 sizeof(*ref) + name_len);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100440 if (ret) {
441 btrfs_abort_transaction(trans, tree_root, ret);
442 btrfs_free_path(path);
443 return ret;
444 }
Chris Mason0660b5a2008-11-17 20:37:39 -0500445
446 leaf = path->nodes[0];
447 ref = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_ref);
448 btrfs_set_root_ref_dirid(leaf, ref, dirid);
449 btrfs_set_root_ref_sequence(leaf, ref, sequence);
450 btrfs_set_root_ref_name_len(leaf, ref, name_len);
451 ptr = (unsigned long)(ref + 1);
452 write_extent_buffer(leaf, name, ptr, name_len);
453 btrfs_mark_buffer_dirty(leaf);
454
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400455 if (key.type == BTRFS_ROOT_BACKREF_KEY) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200456 btrfs_release_path(path);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400457 key.objectid = ref_id;
458 key.type = BTRFS_ROOT_REF_KEY;
459 key.offset = root_id;
460 goto again;
461 }
462
Chris Mason0660b5a2008-11-17 20:37:39 -0500463 btrfs_free_path(path);
Yan, Zheng4df27c4d2009-09-21 15:56:00 -0400464 return 0;
Chris Mason0660b5a2008-11-17 20:37:39 -0500465}
Li Zefan08fe4db2011-03-28 02:01:25 +0000466
467/*
468 * Old btrfs forgets to init root_item->flags and root_item->byte_limit
469 * for subvolumes. To work around this problem, we steal a bit from
470 * root_item->inode_item->flags, and use it to indicate if those fields
471 * have been properly initialized.
472 */
473void btrfs_check_and_init_root_item(struct btrfs_root_item *root_item)
474{
Qu Wenruo3cae2102013-07-16 11:19:18 +0800475 u64 inode_flags = btrfs_stack_inode_flags(&root_item->inode);
Li Zefan08fe4db2011-03-28 02:01:25 +0000476
477 if (!(inode_flags & BTRFS_INODE_ROOT_ITEM_INIT)) {
478 inode_flags |= BTRFS_INODE_ROOT_ITEM_INIT;
Qu Wenruo3cae2102013-07-16 11:19:18 +0800479 btrfs_set_stack_inode_flags(&root_item->inode, inode_flags);
480 btrfs_set_root_flags(root_item, 0);
481 btrfs_set_root_limit(root_item, 0);
Li Zefan08fe4db2011-03-28 02:01:25 +0000482 }
483}
Alexander Block8ea05e32012-07-25 17:35:53 +0200484
485void btrfs_update_root_times(struct btrfs_trans_handle *trans,
486 struct btrfs_root *root)
487{
488 struct btrfs_root_item *item = &root->root_item;
489 struct timespec ct = CURRENT_TIME;
490
Anand Jain5f3ab902012-12-07 09:28:54 +0000491 spin_lock(&root->root_item_lock);
Qu Wenruo3cae2102013-07-16 11:19:18 +0800492 btrfs_set_root_ctransid(item, trans->transid);
493 btrfs_set_stack_timespec_sec(&item->ctime, ct.tv_sec);
494 btrfs_set_stack_timespec_nsec(&item->ctime, ct.tv_nsec);
Anand Jain5f3ab902012-12-07 09:28:54 +0000495 spin_unlock(&root->root_item_lock);
Alexander Block8ea05e32012-07-25 17:35:53 +0200496}