blob: c7fb3a4247d3a766ab07cec511b6f0001e8f5e9f [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;
David Sterba6c417612011-04-13 15:41:04 +020094 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040095 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -040096
Chris Masond20f7042008-12-08 16:58:54 -050097 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
98 file_key.offset = bytenr;
99 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masonb18c6682007-04-17 13:26:50 -0400100 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -0400101 if (ret < 0)
102 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -0400103 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -0400104 if (ret > 0) {
105 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -0400106 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400107 goto fail;
108 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400109 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500110 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400111 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500112
113 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400114 root->fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400115 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500116 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400117
118 if (csum_offset >= csums_in_item) {
119 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400120 goto fail;
121 }
122 }
123 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400124 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500125 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400126 return item;
127fail:
128 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400129 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400130 return ERR_PTR(ret);
131}
132
133
Chris Masondee26a92007-03-26 16:00:06 -0400134int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
135 struct btrfs_root *root,
136 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400137 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400138{
139 int ret;
140 struct btrfs_key file_key;
141 int ins_len = mod < 0 ? -1 : 0;
142 int cow = mod != 0;
143
144 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400145 file_key.offset = offset;
Chris Masondee26a92007-03-26 16:00:06 -0400146 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
147 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
148 return ret;
149}
Chris Masonf254e522007-03-29 15:15:27 -0400150
Yan Zheng17d217f2008-12-12 10:03:38 -0500151
Josef Bacik4b46fce2010-05-23 11:00:55 -0400152static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
153 struct inode *inode, struct bio *bio,
154 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400155{
156 u32 sum;
157 struct bio_vec *bvec = bio->bi_io_vec;
158 int bio_index = 0;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400159 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400160 u64 item_start_offset = 0;
161 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500162 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400163 u32 diff;
David Sterba6c417612011-04-13 15:41:04 +0200164 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason61b49442008-07-31 15:42:53 -0400165 int ret;
166 struct btrfs_path *path;
167 struct btrfs_csum_item *item = NULL;
168 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
169
170 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000171 if (!path)
172 return -ENOMEM;
Chris Mason4d1b5fb2008-08-20 09:44:52 -0400173 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
174 path->reada = 2;
Chris Mason61b49442008-07-31 15:42:53 -0400175
176 WARN_ON(bio->bi_vcnt <= 0);
177
Chris Mason2cf85722011-07-26 15:35:09 -0400178 /*
179 * the free space stuff is only read when it hasn't been
180 * updated in the current transaction. So, we can safely
181 * read from the commit root and sidestep a nasty deadlock
182 * between reading the free space cache and updating the csum tree.
183 */
Josef Bacikddf23b32011-09-11 10:52:24 -0400184 if (btrfs_is_free_space_inode(root, inode)) {
Chris Mason2cf85722011-07-26 15:35:09 -0400185 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400186 path->skip_locking = 1;
187 }
Chris Mason2cf85722011-07-26 15:35:09 -0400188
Chris Masond20f7042008-12-08 16:58:54 -0500189 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400190 if (dio)
191 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500192 while (bio_index < bio->bi_vcnt) {
Josef Bacik4b46fce2010-05-23 11:00:55 -0400193 if (!dio)
194 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Chris Masond20f7042008-12-08 16:58:54 -0500195 ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum);
Chris Mason61b49442008-07-31 15:42:53 -0400196 if (ret == 0)
197 goto found;
198
Chris Masond20f7042008-12-08 16:58:54 -0500199 if (!item || disk_bytenr < item_start_offset ||
200 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400201 struct btrfs_key found_key;
202 u32 item_size;
203
204 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200205 btrfs_release_path(path);
Chris Masond20f7042008-12-08 16:58:54 -0500206 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
207 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400208 if (IS_ERR(item)) {
209 ret = PTR_ERR(item);
210 if (ret == -ENOENT || ret == -EFBIG)
211 ret = 0;
212 sum = 0;
Yan Zheng17d217f2008-12-12 10:03:38 -0500213 if (BTRFS_I(inode)->root->root_key.objectid ==
214 BTRFS_DATA_RELOC_TREE_OBJECTID) {
215 set_extent_bits(io_tree, offset,
216 offset + bvec->bv_len - 1,
217 EXTENT_NODATASUM, GFP_NOFS);
218 } else {
Chris Masond3977122009-01-05 21:25:51 -0500219 printk(KERN_INFO "btrfs no csum found "
Li Zefan33345d012011-04-20 10:31:50 +0800220 "for inode %llu start %llu\n",
221 (unsigned long long)
222 btrfs_ino(inode),
Yan Zheng17d217f2008-12-12 10:03:38 -0500223 (unsigned long long)offset);
224 }
Chris Mason6dab8152008-08-04 08:35:53 -0400225 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200226 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400227 goto found;
228 }
229 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
230 path->slots[0]);
231
232 item_start_offset = found_key.offset;
233 item_size = btrfs_item_size_nr(path->nodes[0],
234 path->slots[0]);
235 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500236 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400237 root->sectorsize;
238 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
239 struct btrfs_csum_item);
240 }
241 /*
242 * this byte range must be able to fit inside
243 * a single leaf so it will also fit inside a u32
244 */
Chris Masond20f7042008-12-08 16:58:54 -0500245 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400246 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500247 diff = diff * csum_size;
Chris Mason61b49442008-07-31 15:42:53 -0400248
249 read_extent_buffer(path->nodes[0], &sum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400250 ((unsigned long)item) + diff,
Josef Bacik607d4322008-12-02 07:17:45 -0500251 csum_size);
Chris Mason61b49442008-07-31 15:42:53 -0400252found:
Chris Masond20f7042008-12-08 16:58:54 -0500253 if (dst)
254 *dst++ = sum;
255 else
256 set_state_private(io_tree, offset, sum);
257 disk_bytenr += bvec->bv_len;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400258 offset += bvec->bv_len;
Chris Mason61b49442008-07-31 15:42:53 -0400259 bio_index++;
260 bvec++;
261 }
262 btrfs_free_path(path);
263 return 0;
264}
265
Josef Bacik4b46fce2010-05-23 11:00:55 -0400266int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
267 struct bio *bio, u32 *dst)
268{
269 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
270}
271
272int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
273 struct bio *bio, u64 offset, u32 *dst)
274{
275 return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1);
276}
277
Yan Zheng17d217f2008-12-12 10:03:38 -0500278int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100279 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500280{
281 struct btrfs_key key;
282 struct btrfs_path *path;
283 struct extent_buffer *leaf;
284 struct btrfs_ordered_sum *sums;
285 struct btrfs_sector_sum *sector_sum;
286 struct btrfs_csum_item *item;
287 unsigned long offset;
288 int ret;
289 size_t size;
290 u64 csum_end;
David Sterba6c417612011-04-13 15:41:04 +0200291 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500292
293 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700294 if (!path)
295 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500296
Arne Jansena2de7332011-03-08 14:14:00 +0100297 if (search_commit) {
298 path->skip_locking = 1;
299 path->reada = 2;
300 path->search_commit_root = 1;
301 }
302
Yan Zheng17d217f2008-12-12 10:03:38 -0500303 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
304 key.offset = start;
305 key.type = BTRFS_EXTENT_CSUM_KEY;
306
Yan Zheng07d400a2009-01-06 11:42:00 -0500307 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500308 if (ret < 0)
309 goto fail;
310 if (ret > 0 && path->slots[0] > 0) {
311 leaf = path->nodes[0];
312 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
313 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
314 key.type == BTRFS_EXTENT_CSUM_KEY) {
315 offset = (start - key.offset) >>
316 root->fs_info->sb->s_blocksize_bits;
317 if (offset * csum_size <
318 btrfs_item_size_nr(leaf, path->slots[0] - 1))
319 path->slots[0]--;
320 }
321 }
322
323 while (start <= end) {
324 leaf = path->nodes[0];
325 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500326 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500327 if (ret < 0)
328 goto fail;
329 if (ret > 0)
330 break;
331 leaf = path->nodes[0];
332 }
333
334 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
335 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
336 key.type != BTRFS_EXTENT_CSUM_KEY)
337 break;
338
339 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
340 if (key.offset > end)
341 break;
342
343 if (key.offset > start)
344 start = key.offset;
345
346 size = btrfs_item_size_nr(leaf, path->slots[0]);
347 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500348 if (csum_end <= start) {
349 path->slots[0]++;
350 continue;
351 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500352
Yan Zheng07d400a2009-01-06 11:42:00 -0500353 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500354 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
355 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500356 while (start < csum_end) {
357 size = min_t(size_t, csum_end - start,
358 MAX_ORDERED_SUM_BYTES(root));
359 sums = kzalloc(btrfs_ordered_sum_size(root, size),
360 GFP_NOFS);
361 BUG_ON(!sums);
Yan Zheng17d217f2008-12-12 10:03:38 -0500362
Yan Zheng07d400a2009-01-06 11:42:00 -0500363 sector_sum = sums->sums;
364 sums->bytenr = start;
365 sums->len = size;
366
367 offset = (start - key.offset) >>
368 root->fs_info->sb->s_blocksize_bits;
369 offset *= csum_size;
370
371 while (size > 0) {
372 read_extent_buffer(path->nodes[0],
373 &sector_sum->sum,
374 ((unsigned long)item) +
375 offset, csum_size);
376 sector_sum->bytenr = start;
377
378 size -= root->sectorsize;
379 start += root->sectorsize;
380 offset += csum_size;
381 sector_sum++;
382 }
383 list_add_tail(&sums->list, list);
Yan Zheng17d217f2008-12-12 10:03:38 -0500384 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500385 path->slots[0]++;
386 }
387 ret = 0;
388fail:
389 btrfs_free_path(path);
390 return ret;
391}
392
Chris Mason3edf7d32008-07-18 06:17:13 -0400393int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
Chris Masond20f7042008-12-08 16:58:54 -0500394 struct bio *bio, u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400395{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400396 struct btrfs_ordered_sum *sums;
397 struct btrfs_sector_sum *sector_sum;
Chris Mason3edf7d32008-07-18 06:17:13 -0400398 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400399 char *data;
400 struct bio_vec *bvec = bio->bi_io_vec;
401 int bio_index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400402 unsigned long total_bytes = 0;
403 unsigned long this_sum_bytes = 0;
404 u64 offset;
Chris Masond20f7042008-12-08 16:58:54 -0500405 u64 disk_bytenr;
Chris Masone0156402008-04-16 11:15:20 -0400406
Chris Masone6dcd2d2008-07-17 12:53:50 -0400407 WARN_ON(bio->bi_vcnt <= 0);
408 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400409 if (!sums)
410 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400411
Chris Masoned98b562008-07-22 23:06:42 -0400412 sector_sum = sums->sums;
Chris Masond20f7042008-12-08 16:58:54 -0500413 disk_bytenr = (u64)bio->bi_sector << 9;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400414 sums->len = bio->bi_size;
415 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500416
417 if (contig)
418 offset = file_start;
419 else
420 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
421
422 ordered = btrfs_lookup_ordered_extent(inode, offset);
Chris Mason3edf7d32008-07-18 06:17:13 -0400423 BUG_ON(!ordered);
Chris Masond20f7042008-12-08 16:58:54 -0500424 sums->bytenr = ordered->start;
Chris Masone0156402008-04-16 11:15:20 -0400425
Chris Masond3977122009-01-05 21:25:51 -0500426 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500427 if (!contig)
428 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
429
430 if (!contig && (offset >= ordered->file_offset + ordered->len ||
431 offset < ordered->file_offset)) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400432 unsigned long bytes_left;
433 sums->len = this_sum_bytes;
434 this_sum_bytes = 0;
435 btrfs_add_ordered_sum(inode, ordered, sums);
436 btrfs_put_ordered_extent(ordered);
437
438 bytes_left = bio->bi_size - total_bytes;
439
440 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
441 GFP_NOFS);
442 BUG_ON(!sums);
Chris Masoned98b562008-07-22 23:06:42 -0400443 sector_sum = sums->sums;
Chris Mason3edf7d32008-07-18 06:17:13 -0400444 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500445 ordered = btrfs_lookup_ordered_extent(inode, offset);
Chris Mason3edf7d32008-07-18 06:17:13 -0400446 BUG_ON(!ordered);
Chris Masond20f7042008-12-08 16:58:54 -0500447 sums->bytenr = ordered->start;
Chris Mason3edf7d32008-07-18 06:17:13 -0400448 }
449
Chris Masone0156402008-04-16 11:15:20 -0400450 data = kmap_atomic(bvec->bv_page, KM_USER0);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400451 sector_sum->sum = ~(u32)0;
452 sector_sum->sum = btrfs_csum_data(root,
453 data + bvec->bv_offset,
454 sector_sum->sum,
455 bvec->bv_len);
Chris Masone0156402008-04-16 11:15:20 -0400456 kunmap_atomic(data, KM_USER0);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400457 btrfs_csum_final(sector_sum->sum,
458 (char *)&sector_sum->sum);
Chris Masond20f7042008-12-08 16:58:54 -0500459 sector_sum->bytenr = disk_bytenr;
Chris Masoned98b562008-07-22 23:06:42 -0400460
Chris Masone6dcd2d2008-07-17 12:53:50 -0400461 sector_sum++;
Chris Masone0156402008-04-16 11:15:20 -0400462 bio_index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400463 total_bytes += bvec->bv_len;
464 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500465 disk_bytenr += bvec->bv_len;
466 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400467 bvec++;
468 }
Chris Masoned98b562008-07-22 23:06:42 -0400469 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400470 btrfs_add_ordered_sum(inode, ordered, sums);
471 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400472 return 0;
473}
474
Chris Mason459931e2008-12-10 09:10:46 -0500475/*
476 * helper function for csum removal, this expects the
477 * key to describe the csum pointed to by the path, and it expects
478 * the csum to overlap the range [bytenr, len]
479 *
480 * The csum should not be entirely contained in the range and the
481 * range should not be entirely contained in the csum.
482 *
483 * This calls btrfs_truncate_item with the correct args based on the
484 * overlap, and fixes up the key as required.
485 */
486static noinline int truncate_one_csum(struct btrfs_trans_handle *trans,
487 struct btrfs_root *root,
488 struct btrfs_path *path,
489 struct btrfs_key *key,
490 u64 bytenr, u64 len)
491{
492 struct extent_buffer *leaf;
David Sterba6c417612011-04-13 15:41:04 +0200493 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500494 u64 csum_end;
495 u64 end_byte = bytenr + len;
496 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
497 int ret;
498
499 leaf = path->nodes[0];
500 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
501 csum_end <<= root->fs_info->sb->s_blocksize_bits;
502 csum_end += key->offset;
503
504 if (key->offset < bytenr && csum_end <= end_byte) {
505 /*
506 * [ bytenr - len ]
507 * [ ]
508 * [csum ]
509 * A simple truncate off the end of the item
510 */
511 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
512 new_size *= csum_size;
513 ret = btrfs_truncate_item(trans, root, path, new_size, 1);
Chris Mason459931e2008-12-10 09:10:46 -0500514 } else if (key->offset >= bytenr && csum_end > end_byte &&
515 end_byte > key->offset) {
516 /*
517 * [ bytenr - len ]
518 * [ ]
519 * [csum ]
520 * we need to truncate from the beginning of the csum
521 */
522 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
523 new_size *= csum_size;
524
525 ret = btrfs_truncate_item(trans, root, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500526
527 key->offset = end_byte;
528 ret = btrfs_set_item_key_safe(trans, root, path, key);
529 BUG_ON(ret);
530 } else {
531 BUG();
532 }
533 return 0;
534}
535
536/*
537 * deletes the csum items from the csum tree for a given
538 * range of bytes.
539 */
540int btrfs_del_csums(struct btrfs_trans_handle *trans,
541 struct btrfs_root *root, u64 bytenr, u64 len)
542{
543 struct btrfs_path *path;
544 struct btrfs_key key;
545 u64 end_byte = bytenr + len;
546 u64 csum_end;
547 struct extent_buffer *leaf;
548 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200549 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500550 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
551
552 root = root->fs_info->csum_root;
553
554 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000555 if (!path)
556 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500557
Chris Masond3977122009-01-05 21:25:51 -0500558 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500559 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
560 key.offset = end_byte - 1;
561 key.type = BTRFS_EXTENT_CSUM_KEY;
562
Chris Masonb9473432009-03-13 11:00:37 -0400563 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500564 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
565 if (ret > 0) {
566 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000567 break;
Chris Mason459931e2008-12-10 09:10:46 -0500568 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000569 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000570 break;
Chris Mason459931e2008-12-10 09:10:46 -0500571 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000572
Chris Mason459931e2008-12-10 09:10:46 -0500573 leaf = path->nodes[0];
574 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
575
576 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
577 key.type != BTRFS_EXTENT_CSUM_KEY) {
578 break;
579 }
580
581 if (key.offset >= end_byte)
582 break;
583
584 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
585 csum_end <<= blocksize_bits;
586 csum_end += key.offset;
587
588 /* this csum ends before we start, we're done */
589 if (csum_end <= bytenr)
590 break;
591
592 /* delete the entire item, it is inside our range */
593 if (key.offset >= bytenr && csum_end <= end_byte) {
594 ret = btrfs_del_item(trans, root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000595 if (ret)
596 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500597 if (key.offset == bytenr)
598 break;
Chris Mason459931e2008-12-10 09:10:46 -0500599 } else if (key.offset < bytenr && csum_end > end_byte) {
600 unsigned long offset;
601 unsigned long shift_len;
602 unsigned long item_offset;
603 /*
604 * [ bytenr - len ]
605 * [csum ]
606 *
607 * Our bytes are in the middle of the csum,
608 * we need to split this item and insert a new one.
609 *
610 * But we can't drop the path because the
611 * csum could change, get removed, extended etc.
612 *
613 * The trick here is the max size of a csum item leaves
614 * enough room in the tree block for a single
615 * item header. So, we split the item in place,
616 * adding a new header pointing to the existing
617 * bytes. Then we loop around again and we have
618 * a nicely formed csum item that we can neatly
619 * truncate.
620 */
621 offset = (bytenr - key.offset) >> blocksize_bits;
622 offset *= csum_size;
623
624 shift_len = (len >> blocksize_bits) * csum_size;
625
626 item_offset = btrfs_item_ptr_offset(leaf,
627 path->slots[0]);
628
629 memset_extent_buffer(leaf, 0, item_offset + offset,
630 shift_len);
631 key.offset = bytenr;
632
633 /*
634 * btrfs_split_item returns -EAGAIN when the
635 * item changed size or key
636 */
637 ret = btrfs_split_item(trans, root, path, &key, offset);
638 BUG_ON(ret && ret != -EAGAIN);
639
640 key.offset = end_byte - 1;
641 } else {
642 ret = truncate_one_csum(trans, root, path,
643 &key, bytenr, len);
644 BUG_ON(ret);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500645 if (key.offset < bytenr)
646 break;
Chris Mason459931e2008-12-10 09:10:46 -0500647 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200648 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500649 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000650 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500651out:
652 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000653 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500654}
655
Chris Mason065631f2008-02-20 12:07:25 -0500656int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500657 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400658 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400659{
Chris Masond20f7042008-12-08 16:58:54 -0500660 u64 bytenr;
Chris Masonf254e522007-03-29 15:15:27 -0400661 int ret;
662 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400663 struct btrfs_key found_key;
Chris Mason065631f2008-02-20 12:07:25 -0500664 u64 next_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400665 u64 total_bytes = 0;
Chris Mason065631f2008-02-20 12:07:25 -0500666 int found_next;
Chris Mason5caf2a02007-04-02 11:20:42 -0400667 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400668 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500669 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400670 struct extent_buffer *leaf = NULL;
Chris Mason6567e832007-04-16 09:22:45 -0400671 u64 csum_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400672 struct btrfs_sector_sum *sector_sum;
Chris Masonf578d4b2007-10-25 15:42:56 -0400673 u32 nritems;
674 u32 ins_size;
David Sterba6c417612011-04-13 15:41:04 +0200675 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500676
Chris Mason5caf2a02007-04-02 11:20:42 -0400677 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700678 if (!path)
679 return -ENOMEM;
680
Chris Masoned98b562008-07-22 23:06:42 -0400681 sector_sum = sums->sums;
Chris Mason065631f2008-02-20 12:07:25 -0500682again:
683 next_offset = (u64)-1;
684 found_next = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500685 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
686 file_key.offset = sector_sum->bytenr;
687 bytenr = sector_sum->bytenr;
688 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400689
Chris Masond20f7042008-12-08 16:58:54 -0500690 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400691 if (!IS_ERR(item)) {
692 leaf = path->nodes[0];
Chris Mason639cb582008-08-28 06:15:25 -0400693 ret = 0;
Chris Masona429e512007-04-18 16:15:28 -0400694 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400695 }
Chris Masona429e512007-04-18 16:15:28 -0400696 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400697 if (ret != -EFBIG && ret != -ENOENT)
698 goto fail_unlock;
699
Chris Masona429e512007-04-18 16:15:28 -0400700 if (ret == -EFBIG) {
701 u32 item_size;
702 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400703 leaf = path->nodes[0];
704 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500705 if ((item_size / csum_size) >=
706 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400707 /* already at max size, make a new one */
708 goto insert;
709 }
710 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400711 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400712 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400713 nritems = btrfs_header_nritems(path->nodes[0]);
714 if (path->slots[0] >= nritems - 1) {
715 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400716 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400717 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400718 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400719 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400720 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400721 }
722 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500723 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
724 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400725 found_next = 1;
726 goto insert;
727 }
728 next_offset = found_key.offset;
729 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400730 goto insert;
731 }
732
733 /*
734 * at this point, we know the tree has an item, but it isn't big
735 * enough yet to put our csum in. Grow it
736 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200737 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400738 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500739 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400740 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400741 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500742
743 if (ret > 0) {
744 if (path->slots[0] == 0)
745 goto insert;
746 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400747 }
Chris Mason459931e2008-12-10 09:10:46 -0500748
Chris Mason5f39d392007-10-15 16:14:19 -0400749 leaf = path->nodes[0];
750 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500751 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400752 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500753
Chris Masond20f7042008-12-08 16:58:54 -0500754 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
755 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500756 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400757 goto insert;
758 }
Chris Mason459931e2008-12-10 09:10:46 -0500759
Chris Mason5f39d392007-10-15 16:14:19 -0400760 if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500761 csum_size) {
762 u32 diff = (csum_offset + 1) * csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500763
764 /*
765 * is the item big enough already? we dropped our lock
766 * before and need to recheck
767 */
768 if (diff < btrfs_item_size_nr(leaf, path->slots[0]))
769 goto csum;
770
Chris Mason5f39d392007-10-15 16:14:19 -0400771 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Chris Masond3977122009-01-05 21:25:51 -0500772 if (diff != csum_size)
Chris Mason3a686372007-05-24 13:35:57 -0400773 goto insert;
Chris Mason459931e2008-12-10 09:10:46 -0500774
Chris Masona429e512007-04-18 16:15:28 -0400775 ret = btrfs_extend_item(trans, root, path, diff);
Chris Mason6567e832007-04-16 09:22:45 -0400776 goto csum;
777 }
778
779insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200780 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400781 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400782 if (found_next) {
Chris Masond20f7042008-12-08 16:58:54 -0500783 u64 tmp = total_bytes + root->sectorsize;
784 u64 next_sector = sector_sum->bytenr;
785 struct btrfs_sector_sum *next = sector_sum + 1;
786
Chris Masond3977122009-01-05 21:25:51 -0500787 while (tmp < sums->len) {
Chris Masond20f7042008-12-08 16:58:54 -0500788 if (next_sector + root->sectorsize != next->bytenr)
789 break;
790 tmp += root->sectorsize;
791 next_sector = next->bytenr;
792 next++;
793 }
794 tmp = min(tmp, next_offset - file_key.offset);
Chris Masonf578d4b2007-10-25 15:42:56 -0400795 tmp >>= root->fs_info->sb->s_blocksize_bits;
796 tmp = max((u64)1, tmp);
Josef Bacik607d4322008-12-02 07:17:45 -0500797 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
798 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400799 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500800 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400801 }
Chris Masonb9473432009-03-13 11:00:37 -0400802 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400803 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400804 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400805 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400806 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400807 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400808 if (ret != 0) {
Chris Masona429e512007-04-18 16:15:28 -0400809 WARN_ON(1);
Chris Mason53863232008-08-15 15:34:18 -0400810 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400811 }
Chris Mason6567e832007-04-16 09:22:45 -0400812csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400813 leaf = path->nodes[0];
814 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Masonf254e522007-03-29 15:15:27 -0400815 ret = 0;
Chris Mason509659c2007-05-10 12:36:17 -0400816 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500817 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400818found:
Chris Mason065631f2008-02-20 12:07:25 -0500819 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
820 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
821 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masone6dcd2d2008-07-17 12:53:50 -0400822next_sector:
Chris Masonaadfeb62008-01-29 09:10:27 -0500823
Chris Masona6591712011-07-19 12:04:14 -0400824 write_extent_buffer(leaf, &sector_sum->sum, (unsigned long)item, csum_size);
Chris Mason7f3c74f2008-07-18 12:01:11 -0400825
Chris Masone6dcd2d2008-07-17 12:53:50 -0400826 total_bytes += root->sectorsize;
827 sector_sum++;
828 if (total_bytes < sums->len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500829 item = (struct btrfs_csum_item *)((char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500830 csum_size);
Chris Masond20f7042008-12-08 16:58:54 -0500831 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
832 sector_sum->bytenr) {
833 bytenr = sector_sum->bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400834 goto next_sector;
Chris Mason2e1a9922008-02-20 15:44:32 -0500835 }
Chris Mason065631f2008-02-20 12:07:25 -0500836 }
Chris Masona6591712011-07-19 12:04:14 -0400837
Chris Mason5caf2a02007-04-02 11:20:42 -0400838 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400839 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200840 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400841 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500842 goto again;
843 }
Chris Mason53863232008-08-15 15:34:18 -0400844out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400845 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400846 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400847
848fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400849 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400850}