blob: a6a9d4e8b491eee488316c97f6f975e167bf13db [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 Mason065631f2008-02-20 12:07:25 -050019#include <linux/bio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090020#include <linux/slab.h>
Chris Mason065631f2008-02-20 12:07:25 -050021#include <linux/pagemap.h>
22#include <linux/highmem.h>
Chris Mason1e1d2702007-03-15 19:03:33 -040023#include "ctree.h"
Chris Masondee26a92007-03-26 16:00:06 -040024#include "disk-io.h"
Chris Mason9f5fae22007-03-20 14:38:32 -040025#include "transaction.h"
Chris Mason1de037a2007-05-29 15:17:08 -040026#include "print-tree.h"
Chris Mason1e1d2702007-03-15 19:03:33 -040027
Chris Masond3977122009-01-05 21:25:51 -050028#define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \
Josef Bacik607d4322008-12-02 07:17:45 -050029 sizeof(struct btrfs_item) * 2) / \
30 size) - 1))
Yan Zheng07d400a2009-01-06 11:42:00 -050031
32#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
33 sizeof(struct btrfs_ordered_sum)) / \
34 sizeof(struct btrfs_sector_sum) * \
35 (r)->sectorsize - (r)->sectorsize)
36
Chris Masonb18c6682007-04-17 13:26:50 -040037int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
Sage Weilf2eb0a22008-05-02 14:43:14 -040038 struct btrfs_root *root,
39 u64 objectid, u64 pos,
40 u64 disk_offset, u64 disk_num_bytes,
Chris Masonc8b97812008-10-29 14:49:59 -040041 u64 num_bytes, u64 offset, u64 ram_bytes,
42 u8 compression, u8 encryption, u16 other_encoding)
Chris Mason9f5fae22007-03-20 14:38:32 -040043{
Chris Masondee26a92007-03-26 16:00:06 -040044 int ret = 0;
45 struct btrfs_file_extent_item *item;
46 struct btrfs_key file_key;
Chris Mason5caf2a02007-04-02 11:20:42 -040047 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040048 struct extent_buffer *leaf;
Chris Masondee26a92007-03-26 16:00:06 -040049
Chris Mason5caf2a02007-04-02 11:20:42 -040050 path = btrfs_alloc_path();
Tsutomu Itohdb5b4932011-03-23 08:14:16 +000051 if (!path)
52 return -ENOMEM;
Chris Masondee26a92007-03-26 16:00:06 -040053 file_key.objectid = objectid;
Chris Masonb18c6682007-04-17 13:26:50 -040054 file_key.offset = pos;
Chris Masondee26a92007-03-26 16:00:06 -040055 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
56
Chris Masonb9473432009-03-13 11:00:37 -040057 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -040058 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masondee26a92007-03-26 16:00:06 -040059 sizeof(*item));
Chris Mason54aa1f42007-06-22 14:16:25 -040060 if (ret < 0)
61 goto out;
Chris Mason9773a782007-03-27 11:26:26 -040062 BUG_ON(ret);
Chris Mason5f39d392007-10-15 16:14:19 -040063 leaf = path->nodes[0];
64 item = btrfs_item_ptr(leaf, path->slots[0],
Chris Masondee26a92007-03-26 16:00:06 -040065 struct btrfs_file_extent_item);
Sage Weilf2eb0a22008-05-02 14:43:14 -040066 btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
Chris Masondb945352007-10-15 16:15:53 -040067 btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
Sage Weilf2eb0a22008-05-02 14:43:14 -040068 btrfs_set_file_extent_offset(leaf, item, offset);
Chris Masondb945352007-10-15 16:15:53 -040069 btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
Chris Masonc8b97812008-10-29 14:49:59 -040070 btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
Chris Mason5f39d392007-10-15 16:14:19 -040071 btrfs_set_file_extent_generation(leaf, item, trans->transid);
72 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
Chris Masonc8b97812008-10-29 14:49:59 -040073 btrfs_set_file_extent_compression(leaf, item, compression);
74 btrfs_set_file_extent_encryption(leaf, item, encryption);
75 btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
76
Chris Mason5f39d392007-10-15 16:14:19 -040077 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -040078out:
Chris Mason5caf2a02007-04-02 11:20:42 -040079 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -040080 return ret;
Chris Mason9f5fae22007-03-20 14:38:32 -040081}
Chris Masondee26a92007-03-26 16:00:06 -040082
Chris Masonb18c6682007-04-17 13:26:50 -040083struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
84 struct btrfs_root *root,
85 struct btrfs_path *path,
Chris Masond20f7042008-12-08 16:58:54 -050086 u64 bytenr, int cow)
Chris Mason6567e832007-04-16 09:22:45 -040087{
88 int ret;
89 struct btrfs_key file_key;
90 struct btrfs_key found_key;
91 struct btrfs_csum_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040092 struct extent_buffer *leaf;
Chris Mason6567e832007-04-16 09:22:45 -040093 u64 csum_offset = 0;
Josef Bacik607d4322008-12-02 07:17:45 -050094 u16 csum_size =
95 btrfs_super_csum_size(&root->fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040096 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -040097
Chris Masond20f7042008-12-08 16:58:54 -050098 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
99 file_key.offset = bytenr;
100 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masonb18c6682007-04-17 13:26:50 -0400101 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -0400102 if (ret < 0)
103 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -0400104 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -0400105 if (ret > 0) {
106 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -0400107 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400108 goto fail;
109 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400110 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500111 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400112 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500113
114 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400115 root->fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400116 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500117 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400118
119 if (csum_offset >= csums_in_item) {
120 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400121 goto fail;
122 }
123 }
124 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400125 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500126 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400127 return item;
128fail:
129 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400130 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400131 return ERR_PTR(ret);
132}
133
134
Chris Masondee26a92007-03-26 16:00:06 -0400135int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
136 struct btrfs_root *root,
137 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400138 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400139{
140 int ret;
141 struct btrfs_key file_key;
142 int ins_len = mod < 0 ? -1 : 0;
143 int cow = mod != 0;
144
145 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400146 file_key.offset = offset;
Chris Masondee26a92007-03-26 16:00:06 -0400147 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
148 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
149 return ret;
150}
Chris Masonf254e522007-03-29 15:15:27 -0400151
Yan Zheng17d217f2008-12-12 10:03:38 -0500152
Josef Bacik4b46fce2010-05-23 11:00:55 -0400153static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
154 struct inode *inode, struct bio *bio,
155 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400156{
157 u32 sum;
158 struct bio_vec *bvec = bio->bi_io_vec;
159 int bio_index = 0;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400160 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400161 u64 item_start_offset = 0;
162 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500163 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400164 u32 diff;
Josef Bacik607d4322008-12-02 07:17:45 -0500165 u16 csum_size =
166 btrfs_super_csum_size(&root->fs_info->super_copy);
Chris Mason61b49442008-07-31 15:42:53 -0400167 int ret;
168 struct btrfs_path *path;
169 struct btrfs_csum_item *item = NULL;
170 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
171
172 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000173 if (!path)
174 return -ENOMEM;
Chris Mason4d1b5fb2008-08-20 09:44:52 -0400175 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
176 path->reada = 2;
Chris Mason61b49442008-07-31 15:42:53 -0400177
178 WARN_ON(bio->bi_vcnt <= 0);
179
Chris Masond20f7042008-12-08 16:58:54 -0500180 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400181 if (dio)
182 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500183 while (bio_index < bio->bi_vcnt) {
Josef Bacik4b46fce2010-05-23 11:00:55 -0400184 if (!dio)
185 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Chris Masond20f7042008-12-08 16:58:54 -0500186 ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum);
Chris Mason61b49442008-07-31 15:42:53 -0400187 if (ret == 0)
188 goto found;
189
Chris Masond20f7042008-12-08 16:58:54 -0500190 if (!item || disk_bytenr < item_start_offset ||
191 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400192 struct btrfs_key found_key;
193 u32 item_size;
194
195 if (item)
196 btrfs_release_path(root, path);
Chris Masond20f7042008-12-08 16:58:54 -0500197 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
198 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400199 if (IS_ERR(item)) {
200 ret = PTR_ERR(item);
201 if (ret == -ENOENT || ret == -EFBIG)
202 ret = 0;
203 sum = 0;
Yan Zheng17d217f2008-12-12 10:03:38 -0500204 if (BTRFS_I(inode)->root->root_key.objectid ==
205 BTRFS_DATA_RELOC_TREE_OBJECTID) {
206 set_extent_bits(io_tree, offset,
207 offset + bvec->bv_len - 1,
208 EXTENT_NODATASUM, GFP_NOFS);
209 } else {
Chris Masond3977122009-01-05 21:25:51 -0500210 printk(KERN_INFO "btrfs no csum found "
211 "for inode %lu start %llu\n",
212 inode->i_ino,
Yan Zheng17d217f2008-12-12 10:03:38 -0500213 (unsigned long long)offset);
214 }
Chris Mason6dab8152008-08-04 08:35:53 -0400215 item = NULL;
Chris Mason39be25c2008-11-10 11:50:50 -0500216 btrfs_release_path(root, path);
Chris Mason61b49442008-07-31 15:42:53 -0400217 goto found;
218 }
219 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
220 path->slots[0]);
221
222 item_start_offset = found_key.offset;
223 item_size = btrfs_item_size_nr(path->nodes[0],
224 path->slots[0]);
225 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500226 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400227 root->sectorsize;
228 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
229 struct btrfs_csum_item);
230 }
231 /*
232 * this byte range must be able to fit inside
233 * a single leaf so it will also fit inside a u32
234 */
Chris Masond20f7042008-12-08 16:58:54 -0500235 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400236 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500237 diff = diff * csum_size;
Chris Mason61b49442008-07-31 15:42:53 -0400238
239 read_extent_buffer(path->nodes[0], &sum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400240 ((unsigned long)item) + diff,
Josef Bacik607d4322008-12-02 07:17:45 -0500241 csum_size);
Chris Mason61b49442008-07-31 15:42:53 -0400242found:
Chris Masond20f7042008-12-08 16:58:54 -0500243 if (dst)
244 *dst++ = sum;
245 else
246 set_state_private(io_tree, offset, sum);
247 disk_bytenr += bvec->bv_len;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400248 offset += bvec->bv_len;
Chris Mason61b49442008-07-31 15:42:53 -0400249 bio_index++;
250 bvec++;
251 }
252 btrfs_free_path(path);
253 return 0;
254}
255
Josef Bacik4b46fce2010-05-23 11:00:55 -0400256int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
257 struct bio *bio, u32 *dst)
258{
259 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
260}
261
262int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
263 struct bio *bio, u64 offset, u32 *dst)
264{
265 return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1);
266}
267
Yan Zheng17d217f2008-12-12 10:03:38 -0500268int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
269 struct list_head *list)
270{
271 struct btrfs_key key;
272 struct btrfs_path *path;
273 struct extent_buffer *leaf;
274 struct btrfs_ordered_sum *sums;
275 struct btrfs_sector_sum *sector_sum;
276 struct btrfs_csum_item *item;
277 unsigned long offset;
278 int ret;
279 size_t size;
280 u64 csum_end;
281 u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy);
282
283 path = btrfs_alloc_path();
284 BUG_ON(!path);
285
286 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
287 key.offset = start;
288 key.type = BTRFS_EXTENT_CSUM_KEY;
289
Yan Zheng07d400a2009-01-06 11:42:00 -0500290 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500291 if (ret < 0)
292 goto fail;
293 if (ret > 0 && path->slots[0] > 0) {
294 leaf = path->nodes[0];
295 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
296 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
297 key.type == BTRFS_EXTENT_CSUM_KEY) {
298 offset = (start - key.offset) >>
299 root->fs_info->sb->s_blocksize_bits;
300 if (offset * csum_size <
301 btrfs_item_size_nr(leaf, path->slots[0] - 1))
302 path->slots[0]--;
303 }
304 }
305
306 while (start <= end) {
307 leaf = path->nodes[0];
308 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500309 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500310 if (ret < 0)
311 goto fail;
312 if (ret > 0)
313 break;
314 leaf = path->nodes[0];
315 }
316
317 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
318 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
319 key.type != BTRFS_EXTENT_CSUM_KEY)
320 break;
321
322 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
323 if (key.offset > end)
324 break;
325
326 if (key.offset > start)
327 start = key.offset;
328
329 size = btrfs_item_size_nr(leaf, path->slots[0]);
330 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500331 if (csum_end <= start) {
332 path->slots[0]++;
333 continue;
334 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500335
Yan Zheng07d400a2009-01-06 11:42:00 -0500336 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500337 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
338 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500339 while (start < csum_end) {
340 size = min_t(size_t, csum_end - start,
341 MAX_ORDERED_SUM_BYTES(root));
342 sums = kzalloc(btrfs_ordered_sum_size(root, size),
343 GFP_NOFS);
344 BUG_ON(!sums);
Yan Zheng17d217f2008-12-12 10:03:38 -0500345
Yan Zheng07d400a2009-01-06 11:42:00 -0500346 sector_sum = sums->sums;
347 sums->bytenr = start;
348 sums->len = size;
349
350 offset = (start - key.offset) >>
351 root->fs_info->sb->s_blocksize_bits;
352 offset *= csum_size;
353
354 while (size > 0) {
355 read_extent_buffer(path->nodes[0],
356 &sector_sum->sum,
357 ((unsigned long)item) +
358 offset, csum_size);
359 sector_sum->bytenr = start;
360
361 size -= root->sectorsize;
362 start += root->sectorsize;
363 offset += csum_size;
364 sector_sum++;
365 }
366 list_add_tail(&sums->list, list);
Yan Zheng17d217f2008-12-12 10:03:38 -0500367 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500368 path->slots[0]++;
369 }
370 ret = 0;
371fail:
372 btrfs_free_path(path);
373 return ret;
374}
375
Chris Mason3edf7d32008-07-18 06:17:13 -0400376int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
Chris Masond20f7042008-12-08 16:58:54 -0500377 struct bio *bio, u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400378{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400379 struct btrfs_ordered_sum *sums;
380 struct btrfs_sector_sum *sector_sum;
Chris Mason3edf7d32008-07-18 06:17:13 -0400381 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400382 char *data;
383 struct bio_vec *bvec = bio->bi_io_vec;
384 int bio_index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400385 unsigned long total_bytes = 0;
386 unsigned long this_sum_bytes = 0;
387 u64 offset;
Chris Masond20f7042008-12-08 16:58:54 -0500388 u64 disk_bytenr;
Chris Masone0156402008-04-16 11:15:20 -0400389
Chris Masone6dcd2d2008-07-17 12:53:50 -0400390 WARN_ON(bio->bi_vcnt <= 0);
391 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400392 if (!sums)
393 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400394
Chris Masoned98b562008-07-22 23:06:42 -0400395 sector_sum = sums->sums;
Chris Masond20f7042008-12-08 16:58:54 -0500396 disk_bytenr = (u64)bio->bi_sector << 9;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400397 sums->len = bio->bi_size;
398 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500399
400 if (contig)
401 offset = file_start;
402 else
403 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
404
405 ordered = btrfs_lookup_ordered_extent(inode, offset);
Chris Mason3edf7d32008-07-18 06:17:13 -0400406 BUG_ON(!ordered);
Chris Masond20f7042008-12-08 16:58:54 -0500407 sums->bytenr = ordered->start;
Chris Masone0156402008-04-16 11:15:20 -0400408
Chris Masond3977122009-01-05 21:25:51 -0500409 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500410 if (!contig)
411 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
412
413 if (!contig && (offset >= ordered->file_offset + ordered->len ||
414 offset < ordered->file_offset)) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400415 unsigned long bytes_left;
416 sums->len = this_sum_bytes;
417 this_sum_bytes = 0;
418 btrfs_add_ordered_sum(inode, ordered, sums);
419 btrfs_put_ordered_extent(ordered);
420
421 bytes_left = bio->bi_size - total_bytes;
422
423 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
424 GFP_NOFS);
425 BUG_ON(!sums);
Chris Masoned98b562008-07-22 23:06:42 -0400426 sector_sum = sums->sums;
Chris Mason3edf7d32008-07-18 06:17:13 -0400427 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500428 ordered = btrfs_lookup_ordered_extent(inode, offset);
Chris Mason3edf7d32008-07-18 06:17:13 -0400429 BUG_ON(!ordered);
Chris Masond20f7042008-12-08 16:58:54 -0500430 sums->bytenr = ordered->start;
Chris Mason3edf7d32008-07-18 06:17:13 -0400431 }
432
Chris Masone0156402008-04-16 11:15:20 -0400433 data = kmap_atomic(bvec->bv_page, KM_USER0);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400434 sector_sum->sum = ~(u32)0;
435 sector_sum->sum = btrfs_csum_data(root,
436 data + bvec->bv_offset,
437 sector_sum->sum,
438 bvec->bv_len);
Chris Masone0156402008-04-16 11:15:20 -0400439 kunmap_atomic(data, KM_USER0);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400440 btrfs_csum_final(sector_sum->sum,
441 (char *)&sector_sum->sum);
Chris Masond20f7042008-12-08 16:58:54 -0500442 sector_sum->bytenr = disk_bytenr;
Chris Masoned98b562008-07-22 23:06:42 -0400443
Chris Masone6dcd2d2008-07-17 12:53:50 -0400444 sector_sum++;
Chris Masone0156402008-04-16 11:15:20 -0400445 bio_index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400446 total_bytes += bvec->bv_len;
447 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500448 disk_bytenr += bvec->bv_len;
449 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400450 bvec++;
451 }
Chris Masoned98b562008-07-22 23:06:42 -0400452 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400453 btrfs_add_ordered_sum(inode, ordered, sums);
454 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400455 return 0;
456}
457
Chris Mason459931e2008-12-10 09:10:46 -0500458/*
459 * helper function for csum removal, this expects the
460 * key to describe the csum pointed to by the path, and it expects
461 * the csum to overlap the range [bytenr, len]
462 *
463 * The csum should not be entirely contained in the range and the
464 * range should not be entirely contained in the csum.
465 *
466 * This calls btrfs_truncate_item with the correct args based on the
467 * overlap, and fixes up the key as required.
468 */
469static noinline int truncate_one_csum(struct btrfs_trans_handle *trans,
470 struct btrfs_root *root,
471 struct btrfs_path *path,
472 struct btrfs_key *key,
473 u64 bytenr, u64 len)
474{
475 struct extent_buffer *leaf;
476 u16 csum_size =
477 btrfs_super_csum_size(&root->fs_info->super_copy);
478 u64 csum_end;
479 u64 end_byte = bytenr + len;
480 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
481 int ret;
482
483 leaf = path->nodes[0];
484 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
485 csum_end <<= root->fs_info->sb->s_blocksize_bits;
486 csum_end += key->offset;
487
488 if (key->offset < bytenr && csum_end <= end_byte) {
489 /*
490 * [ bytenr - len ]
491 * [ ]
492 * [csum ]
493 * A simple truncate off the end of the item
494 */
495 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
496 new_size *= csum_size;
497 ret = btrfs_truncate_item(trans, root, path, new_size, 1);
498 BUG_ON(ret);
499 } else if (key->offset >= bytenr && csum_end > end_byte &&
500 end_byte > key->offset) {
501 /*
502 * [ bytenr - len ]
503 * [ ]
504 * [csum ]
505 * we need to truncate from the beginning of the csum
506 */
507 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
508 new_size *= csum_size;
509
510 ret = btrfs_truncate_item(trans, root, path, new_size, 0);
511 BUG_ON(ret);
512
513 key->offset = end_byte;
514 ret = btrfs_set_item_key_safe(trans, root, path, key);
515 BUG_ON(ret);
516 } else {
517 BUG();
518 }
519 return 0;
520}
521
522/*
523 * deletes the csum items from the csum tree for a given
524 * range of bytes.
525 */
526int btrfs_del_csums(struct btrfs_trans_handle *trans,
527 struct btrfs_root *root, u64 bytenr, u64 len)
528{
529 struct btrfs_path *path;
530 struct btrfs_key key;
531 u64 end_byte = bytenr + len;
532 u64 csum_end;
533 struct extent_buffer *leaf;
534 int ret;
535 u16 csum_size =
536 btrfs_super_csum_size(&root->fs_info->super_copy);
537 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
538
539 root = root->fs_info->csum_root;
540
541 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000542 if (!path)
543 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500544
Chris Masond3977122009-01-05 21:25:51 -0500545 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500546 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
547 key.offset = end_byte - 1;
548 key.type = BTRFS_EXTENT_CSUM_KEY;
549
Chris Masonb9473432009-03-13 11:00:37 -0400550 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500551 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
552 if (ret > 0) {
553 if (path->slots[0] == 0)
554 goto out;
555 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000556 } else if (ret < 0) {
557 goto out;
Chris Mason459931e2008-12-10 09:10:46 -0500558 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000559
Chris Mason459931e2008-12-10 09:10:46 -0500560 leaf = path->nodes[0];
561 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
562
563 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
564 key.type != BTRFS_EXTENT_CSUM_KEY) {
565 break;
566 }
567
568 if (key.offset >= end_byte)
569 break;
570
571 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
572 csum_end <<= blocksize_bits;
573 csum_end += key.offset;
574
575 /* this csum ends before we start, we're done */
576 if (csum_end <= bytenr)
577 break;
578
579 /* delete the entire item, it is inside our range */
580 if (key.offset >= bytenr && csum_end <= end_byte) {
581 ret = btrfs_del_item(trans, root, path);
582 BUG_ON(ret);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500583 if (key.offset == bytenr)
584 break;
Chris Mason459931e2008-12-10 09:10:46 -0500585 } else if (key.offset < bytenr && csum_end > end_byte) {
586 unsigned long offset;
587 unsigned long shift_len;
588 unsigned long item_offset;
589 /*
590 * [ bytenr - len ]
591 * [csum ]
592 *
593 * Our bytes are in the middle of the csum,
594 * we need to split this item and insert a new one.
595 *
596 * But we can't drop the path because the
597 * csum could change, get removed, extended etc.
598 *
599 * The trick here is the max size of a csum item leaves
600 * enough room in the tree block for a single
601 * item header. So, we split the item in place,
602 * adding a new header pointing to the existing
603 * bytes. Then we loop around again and we have
604 * a nicely formed csum item that we can neatly
605 * truncate.
606 */
607 offset = (bytenr - key.offset) >> blocksize_bits;
608 offset *= csum_size;
609
610 shift_len = (len >> blocksize_bits) * csum_size;
611
612 item_offset = btrfs_item_ptr_offset(leaf,
613 path->slots[0]);
614
615 memset_extent_buffer(leaf, 0, item_offset + offset,
616 shift_len);
617 key.offset = bytenr;
618
619 /*
620 * btrfs_split_item returns -EAGAIN when the
621 * item changed size or key
622 */
623 ret = btrfs_split_item(trans, root, path, &key, offset);
624 BUG_ON(ret && ret != -EAGAIN);
625
626 key.offset = end_byte - 1;
627 } else {
628 ret = truncate_one_csum(trans, root, path,
629 &key, bytenr, len);
630 BUG_ON(ret);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500631 if (key.offset < bytenr)
632 break;
Chris Mason459931e2008-12-10 09:10:46 -0500633 }
634 btrfs_release_path(root, path);
635 }
636out:
637 btrfs_free_path(path);
638 return 0;
639}
640
Chris Mason065631f2008-02-20 12:07:25 -0500641int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500642 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400643 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400644{
Chris Masond20f7042008-12-08 16:58:54 -0500645 u64 bytenr;
Chris Masonf254e522007-03-29 15:15:27 -0400646 int ret;
647 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400648 struct btrfs_key found_key;
Chris Mason065631f2008-02-20 12:07:25 -0500649 u64 next_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400650 u64 total_bytes = 0;
Chris Mason065631f2008-02-20 12:07:25 -0500651 int found_next;
Chris Mason5caf2a02007-04-02 11:20:42 -0400652 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400653 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500654 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400655 struct extent_buffer *leaf = NULL;
Chris Mason6567e832007-04-16 09:22:45 -0400656 u64 csum_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400657 struct btrfs_sector_sum *sector_sum;
Chris Masonf578d4b2007-10-25 15:42:56 -0400658 u32 nritems;
659 u32 ins_size;
Chris Mason6e92f5e2008-02-20 12:07:25 -0500660 char *eb_map;
661 char *eb_token;
662 unsigned long map_len;
663 unsigned long map_start;
Josef Bacik607d4322008-12-02 07:17:45 -0500664 u16 csum_size =
665 btrfs_super_csum_size(&root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500666
Chris Mason5caf2a02007-04-02 11:20:42 -0400667 path = btrfs_alloc_path();
668 BUG_ON(!path);
Chris Masoned98b562008-07-22 23:06:42 -0400669 sector_sum = sums->sums;
Chris Mason065631f2008-02-20 12:07:25 -0500670again:
671 next_offset = (u64)-1;
672 found_next = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500673 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
674 file_key.offset = sector_sum->bytenr;
675 bytenr = sector_sum->bytenr;
676 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400677
Chris Masond20f7042008-12-08 16:58:54 -0500678 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400679 if (!IS_ERR(item)) {
680 leaf = path->nodes[0];
Chris Mason639cb582008-08-28 06:15:25 -0400681 ret = 0;
Chris Masona429e512007-04-18 16:15:28 -0400682 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400683 }
Chris Masona429e512007-04-18 16:15:28 -0400684 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400685 if (ret != -EFBIG && ret != -ENOENT)
686 goto fail_unlock;
687
Chris Masona429e512007-04-18 16:15:28 -0400688 if (ret == -EFBIG) {
689 u32 item_size;
690 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400691 leaf = path->nodes[0];
692 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500693 if ((item_size / csum_size) >=
694 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400695 /* already at max size, make a new one */
696 goto insert;
697 }
698 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400699 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400700 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400701 nritems = btrfs_header_nritems(path->nodes[0]);
702 if (path->slots[0] >= nritems - 1) {
703 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400704 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400705 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400706 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400707 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400708 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400709 }
710 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500711 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
712 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400713 found_next = 1;
714 goto insert;
715 }
716 next_offset = found_key.offset;
717 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400718 goto insert;
719 }
720
721 /*
722 * at this point, we know the tree has an item, but it isn't big
723 * enough yet to put our csum in. Grow it
724 */
725 btrfs_release_path(root, path);
Chris Mason6567e832007-04-16 09:22:45 -0400726 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500727 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400728 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400729 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500730
731 if (ret > 0) {
732 if (path->slots[0] == 0)
733 goto insert;
734 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400735 }
Chris Mason459931e2008-12-10 09:10:46 -0500736
Chris Mason5f39d392007-10-15 16:14:19 -0400737 leaf = path->nodes[0];
738 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500739 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400740 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500741
Chris Masond20f7042008-12-08 16:58:54 -0500742 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
743 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500744 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400745 goto insert;
746 }
Chris Mason459931e2008-12-10 09:10:46 -0500747
Chris Mason5f39d392007-10-15 16:14:19 -0400748 if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500749 csum_size) {
750 u32 diff = (csum_offset + 1) * csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500751
752 /*
753 * is the item big enough already? we dropped our lock
754 * before and need to recheck
755 */
756 if (diff < btrfs_item_size_nr(leaf, path->slots[0]))
757 goto csum;
758
Chris Mason5f39d392007-10-15 16:14:19 -0400759 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Chris Masond3977122009-01-05 21:25:51 -0500760 if (diff != csum_size)
Chris Mason3a686372007-05-24 13:35:57 -0400761 goto insert;
Chris Mason459931e2008-12-10 09:10:46 -0500762
Chris Masona429e512007-04-18 16:15:28 -0400763 ret = btrfs_extend_item(trans, root, path, diff);
Chris Mason6567e832007-04-16 09:22:45 -0400764 BUG_ON(ret);
765 goto csum;
766 }
767
768insert:
Chris Masona429e512007-04-18 16:15:28 -0400769 btrfs_release_path(root, path);
Chris Mason6567e832007-04-16 09:22:45 -0400770 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400771 if (found_next) {
Chris Masond20f7042008-12-08 16:58:54 -0500772 u64 tmp = total_bytes + root->sectorsize;
773 u64 next_sector = sector_sum->bytenr;
774 struct btrfs_sector_sum *next = sector_sum + 1;
775
Chris Masond3977122009-01-05 21:25:51 -0500776 while (tmp < sums->len) {
Chris Masond20f7042008-12-08 16:58:54 -0500777 if (next_sector + root->sectorsize != next->bytenr)
778 break;
779 tmp += root->sectorsize;
780 next_sector = next->bytenr;
781 next++;
782 }
783 tmp = min(tmp, next_offset - file_key.offset);
Chris Masonf578d4b2007-10-25 15:42:56 -0400784 tmp >>= root->fs_info->sb->s_blocksize_bits;
785 tmp = max((u64)1, tmp);
Josef Bacik607d4322008-12-02 07:17:45 -0500786 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
787 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400788 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500789 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400790 }
Chris Masonb9473432009-03-13 11:00:37 -0400791 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400792 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400793 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400794 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400795 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400796 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400797 if (ret != 0) {
Chris Masona429e512007-04-18 16:15:28 -0400798 WARN_ON(1);
Chris Mason53863232008-08-15 15:34:18 -0400799 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400800 }
Chris Mason6567e832007-04-16 09:22:45 -0400801csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400802 leaf = path->nodes[0];
803 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Masonf254e522007-03-29 15:15:27 -0400804 ret = 0;
Chris Mason509659c2007-05-10 12:36:17 -0400805 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500806 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400807found:
Chris Mason065631f2008-02-20 12:07:25 -0500808 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
809 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
810 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Mason6e92f5e2008-02-20 12:07:25 -0500811 eb_token = NULL;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400812next_sector:
Chris Masonaadfeb62008-01-29 09:10:27 -0500813
Chris Mason6e92f5e2008-02-20 12:07:25 -0500814 if (!eb_token ||
Josef Bacik607d4322008-12-02 07:17:45 -0500815 (unsigned long)item + csum_size >= map_start + map_len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500816 int err;
817
818 if (eb_token)
Chris Masoneb209782008-02-21 09:30:08 -0500819 unmap_extent_buffer(leaf, eb_token, KM_USER1);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500820 eb_token = NULL;
821 err = map_private_extent_buffer(leaf, (unsigned long)item,
Josef Bacik607d4322008-12-02 07:17:45 -0500822 csum_size,
Chris Mason6e92f5e2008-02-20 12:07:25 -0500823 &eb_token, &eb_map,
Chris Masoneb209782008-02-21 09:30:08 -0500824 &map_start, &map_len, KM_USER1);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500825 if (err)
826 eb_token = NULL;
827 }
828 if (eb_token) {
829 memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)),
Josef Bacik607d4322008-12-02 07:17:45 -0500830 &sector_sum->sum, csum_size);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500831 } else {
Chris Masone6dcd2d2008-07-17 12:53:50 -0400832 write_extent_buffer(leaf, &sector_sum->sum,
Josef Bacik607d4322008-12-02 07:17:45 -0500833 (unsigned long)item, csum_size);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500834 }
Chris Mason7f3c74f2008-07-18 12:01:11 -0400835
Chris Masone6dcd2d2008-07-17 12:53:50 -0400836 total_bytes += root->sectorsize;
837 sector_sum++;
838 if (total_bytes < sums->len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500839 item = (struct btrfs_csum_item *)((char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500840 csum_size);
Chris Masond20f7042008-12-08 16:58:54 -0500841 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
842 sector_sum->bytenr) {
843 bytenr = sector_sum->bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400844 goto next_sector;
Chris Mason2e1a9922008-02-20 15:44:32 -0500845 }
Chris Mason065631f2008-02-20 12:07:25 -0500846 }
Chris Mason6e92f5e2008-02-20 12:07:25 -0500847 if (eb_token) {
Chris Masoneb209782008-02-21 09:30:08 -0500848 unmap_extent_buffer(leaf, eb_token, KM_USER1);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500849 eb_token = NULL;
850 }
Chris Mason5caf2a02007-04-02 11:20:42 -0400851 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400852 if (total_bytes < sums->len) {
Chris Mason065631f2008-02-20 12:07:25 -0500853 btrfs_release_path(root, path);
Chris Masonb9473432009-03-13 11:00:37 -0400854 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500855 goto again;
856 }
Chris Mason53863232008-08-15 15:34:18 -0400857out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400858 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400859 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400860
861fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400862 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400863}