blob: 5d158d3202331f87675b65f7de0fa7af419b80f2 [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 Mason7ca4be42012-01-31 20:19:02 -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
Chris Mason7ca4be42012-01-31 20:19:02 -050032#define MAX_CSUM_ITEMS(r, size) (min(__MAX_CSUM_ITEMS(r, size), PAGE_CACHE_SIZE))
33
Yan Zheng07d400a2009-01-06 11:42:00 -050034#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
35 sizeof(struct btrfs_ordered_sum)) / \
36 sizeof(struct btrfs_sector_sum) * \
37 (r)->sectorsize - (r)->sectorsize)
38
Chris Masonb18c6682007-04-17 13:26:50 -040039int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
Sage Weilf2eb0a22008-05-02 14:43:14 -040040 struct btrfs_root *root,
41 u64 objectid, u64 pos,
42 u64 disk_offset, u64 disk_num_bytes,
Chris Masonc8b97812008-10-29 14:49:59 -040043 u64 num_bytes, u64 offset, u64 ram_bytes,
44 u8 compression, u8 encryption, u16 other_encoding)
Chris Mason9f5fae22007-03-20 14:38:32 -040045{
Chris Masondee26a92007-03-26 16:00:06 -040046 int ret = 0;
47 struct btrfs_file_extent_item *item;
48 struct btrfs_key file_key;
Chris Mason5caf2a02007-04-02 11:20:42 -040049 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040050 struct extent_buffer *leaf;
Chris Masondee26a92007-03-26 16:00:06 -040051
Chris Mason5caf2a02007-04-02 11:20:42 -040052 path = btrfs_alloc_path();
Tsutomu Itohdb5b4932011-03-23 08:14:16 +000053 if (!path)
54 return -ENOMEM;
Chris Masondee26a92007-03-26 16:00:06 -040055 file_key.objectid = objectid;
Chris Masonb18c6682007-04-17 13:26:50 -040056 file_key.offset = pos;
Chris Masondee26a92007-03-26 16:00:06 -040057 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
58
Chris Masonb9473432009-03-13 11:00:37 -040059 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -040060 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masondee26a92007-03-26 16:00:06 -040061 sizeof(*item));
Chris Mason54aa1f42007-06-22 14:16:25 -040062 if (ret < 0)
63 goto out;
Jeff Mahoney79787ea2012-03-12 16:03:00 +010064 BUG_ON(ret); /* Can't happen */
Chris Mason5f39d392007-10-15 16:14:19 -040065 leaf = path->nodes[0];
66 item = btrfs_item_ptr(leaf, path->slots[0],
Chris Masondee26a92007-03-26 16:00:06 -040067 struct btrfs_file_extent_item);
Sage Weilf2eb0a22008-05-02 14:43:14 -040068 btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
Chris Masondb945352007-10-15 16:15:53 -040069 btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
Sage Weilf2eb0a22008-05-02 14:43:14 -040070 btrfs_set_file_extent_offset(leaf, item, offset);
Chris Masondb945352007-10-15 16:15:53 -040071 btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
Chris Masonc8b97812008-10-29 14:49:59 -040072 btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
Chris Mason5f39d392007-10-15 16:14:19 -040073 btrfs_set_file_extent_generation(leaf, item, trans->transid);
74 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
Chris Masonc8b97812008-10-29 14:49:59 -040075 btrfs_set_file_extent_compression(leaf, item, compression);
76 btrfs_set_file_extent_encryption(leaf, item, encryption);
77 btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
78
Chris Mason5f39d392007-10-15 16:14:19 -040079 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -040080out:
Chris Mason5caf2a02007-04-02 11:20:42 -040081 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -040082 return ret;
Chris Mason9f5fae22007-03-20 14:38:32 -040083}
Chris Masondee26a92007-03-26 16:00:06 -040084
Chris Masonb18c6682007-04-17 13:26:50 -040085struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
86 struct btrfs_root *root,
87 struct btrfs_path *path,
Chris Masond20f7042008-12-08 16:58:54 -050088 u64 bytenr, int cow)
Chris Mason6567e832007-04-16 09:22:45 -040089{
90 int ret;
91 struct btrfs_key file_key;
92 struct btrfs_key found_key;
93 struct btrfs_csum_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040094 struct extent_buffer *leaf;
Chris Mason6567e832007-04-16 09:22:45 -040095 u64 csum_offset = 0;
David Sterba6c417612011-04-13 15:41:04 +020096 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040097 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -040098
Chris Masond20f7042008-12-08 16:58:54 -050099 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
100 file_key.offset = bytenr;
101 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masonb18c6682007-04-17 13:26:50 -0400102 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -0400103 if (ret < 0)
104 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -0400105 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -0400106 if (ret > 0) {
107 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -0400108 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400109 goto fail;
110 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400111 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500112 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400113 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500114
115 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400116 root->fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400117 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500118 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400119
120 if (csum_offset >= csums_in_item) {
121 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400122 goto fail;
123 }
124 }
125 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400126 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500127 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400128 return item;
129fail:
130 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400131 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400132 return ERR_PTR(ret);
133}
134
135
Chris Masondee26a92007-03-26 16:00:06 -0400136int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
137 struct btrfs_root *root,
138 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400139 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400140{
141 int ret;
142 struct btrfs_key file_key;
143 int ins_len = mod < 0 ? -1 : 0;
144 int cow = mod != 0;
145
146 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400147 file_key.offset = offset;
Chris Masondee26a92007-03-26 16:00:06 -0400148 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
149 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
150 return ret;
151}
Chris Masonf254e522007-03-29 15:15:27 -0400152
Yan Zheng17d217f2008-12-12 10:03:38 -0500153
Josef Bacik4b46fce2010-05-23 11:00:55 -0400154static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
155 struct inode *inode, struct bio *bio,
156 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400157{
158 u32 sum;
159 struct bio_vec *bvec = bio->bi_io_vec;
160 int bio_index = 0;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400161 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400162 u64 item_start_offset = 0;
163 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500164 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400165 u32 diff;
David Sterba6c417612011-04-13 15:41:04 +0200166 u16 csum_size = 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 Mason2cf85722011-07-26 15:35:09 -0400180 /*
181 * the free space stuff is only read when it hasn't been
182 * updated in the current transaction. So, we can safely
183 * read from the commit root and sidestep a nasty deadlock
184 * between reading the free space cache and updating the csum tree.
185 */
Josef Bacikddf23b32011-09-11 10:52:24 -0400186 if (btrfs_is_free_space_inode(root, inode)) {
Chris Mason2cf85722011-07-26 15:35:09 -0400187 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400188 path->skip_locking = 1;
189 }
Chris Mason2cf85722011-07-26 15:35:09 -0400190
Chris Masond20f7042008-12-08 16:58:54 -0500191 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400192 if (dio)
193 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500194 while (bio_index < bio->bi_vcnt) {
Josef Bacik4b46fce2010-05-23 11:00:55 -0400195 if (!dio)
196 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Chris Masond20f7042008-12-08 16:58:54 -0500197 ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum);
Chris Mason61b49442008-07-31 15:42:53 -0400198 if (ret == 0)
199 goto found;
200
Chris Masond20f7042008-12-08 16:58:54 -0500201 if (!item || disk_bytenr < item_start_offset ||
202 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400203 struct btrfs_key found_key;
204 u32 item_size;
205
206 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200207 btrfs_release_path(path);
Chris Masond20f7042008-12-08 16:58:54 -0500208 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
209 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400210 if (IS_ERR(item)) {
211 ret = PTR_ERR(item);
212 if (ret == -ENOENT || ret == -EFBIG)
213 ret = 0;
214 sum = 0;
Yan Zheng17d217f2008-12-12 10:03:38 -0500215 if (BTRFS_I(inode)->root->root_key.objectid ==
216 BTRFS_DATA_RELOC_TREE_OBJECTID) {
217 set_extent_bits(io_tree, offset,
218 offset + bvec->bv_len - 1,
219 EXTENT_NODATASUM, GFP_NOFS);
220 } else {
Chris Masond3977122009-01-05 21:25:51 -0500221 printk(KERN_INFO "btrfs no csum found "
Li Zefan33345d012011-04-20 10:31:50 +0800222 "for inode %llu start %llu\n",
223 (unsigned long long)
224 btrfs_ino(inode),
Yan Zheng17d217f2008-12-12 10:03:38 -0500225 (unsigned long long)offset);
226 }
Chris Mason6dab8152008-08-04 08:35:53 -0400227 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200228 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400229 goto found;
230 }
231 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
232 path->slots[0]);
233
234 item_start_offset = found_key.offset;
235 item_size = btrfs_item_size_nr(path->nodes[0],
236 path->slots[0]);
237 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500238 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400239 root->sectorsize;
240 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
241 struct btrfs_csum_item);
242 }
243 /*
244 * this byte range must be able to fit inside
245 * a single leaf so it will also fit inside a u32
246 */
Chris Masond20f7042008-12-08 16:58:54 -0500247 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400248 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500249 diff = diff * csum_size;
Chris Mason61b49442008-07-31 15:42:53 -0400250
251 read_extent_buffer(path->nodes[0], &sum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400252 ((unsigned long)item) + diff,
Josef Bacik607d4322008-12-02 07:17:45 -0500253 csum_size);
Chris Mason61b49442008-07-31 15:42:53 -0400254found:
Chris Masond20f7042008-12-08 16:58:54 -0500255 if (dst)
256 *dst++ = sum;
257 else
258 set_state_private(io_tree, offset, sum);
259 disk_bytenr += bvec->bv_len;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400260 offset += bvec->bv_len;
Chris Mason61b49442008-07-31 15:42:53 -0400261 bio_index++;
262 bvec++;
263 }
264 btrfs_free_path(path);
265 return 0;
266}
267
Josef Bacik4b46fce2010-05-23 11:00:55 -0400268int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
269 struct bio *bio, u32 *dst)
270{
271 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
272}
273
274int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
275 struct bio *bio, u64 offset, u32 *dst)
276{
277 return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1);
278}
279
Yan Zheng17d217f2008-12-12 10:03:38 -0500280int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100281 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500282{
283 struct btrfs_key key;
284 struct btrfs_path *path;
285 struct extent_buffer *leaf;
286 struct btrfs_ordered_sum *sums;
287 struct btrfs_sector_sum *sector_sum;
288 struct btrfs_csum_item *item;
Mark Fasheh0678b612011-08-05 15:46:16 -0700289 LIST_HEAD(tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500290 unsigned long offset;
291 int ret;
292 size_t size;
293 u64 csum_end;
David Sterba6c417612011-04-13 15:41:04 +0200294 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500295
296 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700297 if (!path)
298 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500299
Arne Jansena2de7332011-03-08 14:14:00 +0100300 if (search_commit) {
301 path->skip_locking = 1;
302 path->reada = 2;
303 path->search_commit_root = 1;
304 }
305
Yan Zheng17d217f2008-12-12 10:03:38 -0500306 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
307 key.offset = start;
308 key.type = BTRFS_EXTENT_CSUM_KEY;
309
Yan Zheng07d400a2009-01-06 11:42:00 -0500310 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500311 if (ret < 0)
312 goto fail;
313 if (ret > 0 && path->slots[0] > 0) {
314 leaf = path->nodes[0];
315 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
316 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
317 key.type == BTRFS_EXTENT_CSUM_KEY) {
318 offset = (start - key.offset) >>
319 root->fs_info->sb->s_blocksize_bits;
320 if (offset * csum_size <
321 btrfs_item_size_nr(leaf, path->slots[0] - 1))
322 path->slots[0]--;
323 }
324 }
325
326 while (start <= end) {
327 leaf = path->nodes[0];
328 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500329 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500330 if (ret < 0)
331 goto fail;
332 if (ret > 0)
333 break;
334 leaf = path->nodes[0];
335 }
336
337 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
338 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
339 key.type != BTRFS_EXTENT_CSUM_KEY)
340 break;
341
342 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
343 if (key.offset > end)
344 break;
345
346 if (key.offset > start)
347 start = key.offset;
348
349 size = btrfs_item_size_nr(leaf, path->slots[0]);
350 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500351 if (csum_end <= start) {
352 path->slots[0]++;
353 continue;
354 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500355
Yan Zheng07d400a2009-01-06 11:42:00 -0500356 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500357 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
358 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500359 while (start < csum_end) {
360 size = min_t(size_t, csum_end - start,
361 MAX_ORDERED_SUM_BYTES(root));
362 sums = kzalloc(btrfs_ordered_sum_size(root, size),
363 GFP_NOFS);
Mark Fasheh0678b612011-08-05 15:46:16 -0700364 if (!sums) {
365 ret = -ENOMEM;
366 goto fail;
367 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500368
Yan Zheng07d400a2009-01-06 11:42:00 -0500369 sector_sum = sums->sums;
370 sums->bytenr = start;
371 sums->len = size;
372
373 offset = (start - key.offset) >>
374 root->fs_info->sb->s_blocksize_bits;
375 offset *= csum_size;
376
377 while (size > 0) {
378 read_extent_buffer(path->nodes[0],
379 &sector_sum->sum,
380 ((unsigned long)item) +
381 offset, csum_size);
382 sector_sum->bytenr = start;
383
384 size -= root->sectorsize;
385 start += root->sectorsize;
386 offset += csum_size;
387 sector_sum++;
388 }
Mark Fasheh0678b612011-08-05 15:46:16 -0700389 list_add_tail(&sums->list, &tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500390 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500391 path->slots[0]++;
392 }
393 ret = 0;
394fail:
Mark Fasheh0678b612011-08-05 15:46:16 -0700395 while (ret < 0 && !list_empty(&tmplist)) {
396 sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
397 list_del(&sums->list);
398 kfree(sums);
399 }
400 list_splice_tail(&tmplist, list);
401
Yan Zheng17d217f2008-12-12 10:03:38 -0500402 btrfs_free_path(path);
403 return ret;
404}
405
Chris Mason3edf7d32008-07-18 06:17:13 -0400406int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
Chris Masond20f7042008-12-08 16:58:54 -0500407 struct bio *bio, u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400408{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400409 struct btrfs_ordered_sum *sums;
410 struct btrfs_sector_sum *sector_sum;
Chris Mason3edf7d32008-07-18 06:17:13 -0400411 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400412 char *data;
413 struct bio_vec *bvec = bio->bi_io_vec;
414 int bio_index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400415 unsigned long total_bytes = 0;
416 unsigned long this_sum_bytes = 0;
417 u64 offset;
Chris Masond20f7042008-12-08 16:58:54 -0500418 u64 disk_bytenr;
Chris Masone0156402008-04-16 11:15:20 -0400419
Chris Masone6dcd2d2008-07-17 12:53:50 -0400420 WARN_ON(bio->bi_vcnt <= 0);
421 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400422 if (!sums)
423 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400424
Chris Masoned98b562008-07-22 23:06:42 -0400425 sector_sum = sums->sums;
Chris Masond20f7042008-12-08 16:58:54 -0500426 disk_bytenr = (u64)bio->bi_sector << 9;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400427 sums->len = bio->bi_size;
428 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500429
430 if (contig)
431 offset = file_start;
432 else
433 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
434
435 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100436 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500437 sums->bytenr = ordered->start;
Chris Masone0156402008-04-16 11:15:20 -0400438
Chris Masond3977122009-01-05 21:25:51 -0500439 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500440 if (!contig)
441 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
442
443 if (!contig && (offset >= ordered->file_offset + ordered->len ||
444 offset < ordered->file_offset)) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400445 unsigned long bytes_left;
446 sums->len = this_sum_bytes;
447 this_sum_bytes = 0;
448 btrfs_add_ordered_sum(inode, ordered, sums);
449 btrfs_put_ordered_extent(ordered);
450
451 bytes_left = bio->bi_size - total_bytes;
452
453 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
454 GFP_NOFS);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100455 BUG_ON(!sums); /* -ENOMEM */
Chris Masoned98b562008-07-22 23:06:42 -0400456 sector_sum = sums->sums;
Chris Mason3edf7d32008-07-18 06:17:13 -0400457 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500458 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100459 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500460 sums->bytenr = ordered->start;
Chris Mason3edf7d32008-07-18 06:17:13 -0400461 }
462
Cong Wang7ac687d2011-11-25 23:14:28 +0800463 data = kmap_atomic(bvec->bv_page);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400464 sector_sum->sum = ~(u32)0;
465 sector_sum->sum = btrfs_csum_data(root,
466 data + bvec->bv_offset,
467 sector_sum->sum,
468 bvec->bv_len);
Cong Wang7ac687d2011-11-25 23:14:28 +0800469 kunmap_atomic(data);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400470 btrfs_csum_final(sector_sum->sum,
471 (char *)&sector_sum->sum);
Chris Masond20f7042008-12-08 16:58:54 -0500472 sector_sum->bytenr = disk_bytenr;
Chris Masoned98b562008-07-22 23:06:42 -0400473
Chris Masone6dcd2d2008-07-17 12:53:50 -0400474 sector_sum++;
Chris Masone0156402008-04-16 11:15:20 -0400475 bio_index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400476 total_bytes += bvec->bv_len;
477 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500478 disk_bytenr += bvec->bv_len;
479 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400480 bvec++;
481 }
Chris Masoned98b562008-07-22 23:06:42 -0400482 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400483 btrfs_add_ordered_sum(inode, ordered, sums);
484 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400485 return 0;
486}
487
Chris Mason459931e2008-12-10 09:10:46 -0500488/*
489 * helper function for csum removal, this expects the
490 * key to describe the csum pointed to by the path, and it expects
491 * the csum to overlap the range [bytenr, len]
492 *
493 * The csum should not be entirely contained in the range and the
494 * range should not be entirely contained in the csum.
495 *
496 * This calls btrfs_truncate_item with the correct args based on the
497 * overlap, and fixes up the key as required.
498 */
Jeff Mahoney143bede2012-03-01 14:56:26 +0100499static noinline void truncate_one_csum(struct btrfs_trans_handle *trans,
500 struct btrfs_root *root,
501 struct btrfs_path *path,
502 struct btrfs_key *key,
503 u64 bytenr, u64 len)
Chris Mason459931e2008-12-10 09:10:46 -0500504{
505 struct extent_buffer *leaf;
David Sterba6c417612011-04-13 15:41:04 +0200506 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500507 u64 csum_end;
508 u64 end_byte = bytenr + len;
509 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500510
511 leaf = path->nodes[0];
512 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
513 csum_end <<= root->fs_info->sb->s_blocksize_bits;
514 csum_end += key->offset;
515
516 if (key->offset < bytenr && csum_end <= end_byte) {
517 /*
518 * [ bytenr - len ]
519 * [ ]
520 * [csum ]
521 * A simple truncate off the end of the item
522 */
523 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
524 new_size *= csum_size;
Jeff Mahoney143bede2012-03-01 14:56:26 +0100525 btrfs_truncate_item(trans, root, path, new_size, 1);
Chris Mason459931e2008-12-10 09:10:46 -0500526 } else if (key->offset >= bytenr && csum_end > end_byte &&
527 end_byte > key->offset) {
528 /*
529 * [ bytenr - len ]
530 * [ ]
531 * [csum ]
532 * we need to truncate from the beginning of the csum
533 */
534 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
535 new_size *= csum_size;
536
Jeff Mahoney143bede2012-03-01 14:56:26 +0100537 btrfs_truncate_item(trans, root, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500538
539 key->offset = end_byte;
Jeff Mahoney143bede2012-03-01 14:56:26 +0100540 btrfs_set_item_key_safe(trans, root, path, key);
Chris Mason459931e2008-12-10 09:10:46 -0500541 } else {
542 BUG();
543 }
Chris Mason459931e2008-12-10 09:10:46 -0500544}
545
546/*
547 * deletes the csum items from the csum tree for a given
548 * range of bytes.
549 */
550int btrfs_del_csums(struct btrfs_trans_handle *trans,
551 struct btrfs_root *root, u64 bytenr, u64 len)
552{
553 struct btrfs_path *path;
554 struct btrfs_key key;
555 u64 end_byte = bytenr + len;
556 u64 csum_end;
557 struct extent_buffer *leaf;
558 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200559 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500560 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
561
562 root = root->fs_info->csum_root;
563
564 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000565 if (!path)
566 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500567
Chris Masond3977122009-01-05 21:25:51 -0500568 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500569 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
570 key.offset = end_byte - 1;
571 key.type = BTRFS_EXTENT_CSUM_KEY;
572
Chris Masonb9473432009-03-13 11:00:37 -0400573 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500574 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
575 if (ret > 0) {
576 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000577 break;
Chris Mason459931e2008-12-10 09:10:46 -0500578 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000579 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000580 break;
Chris Mason459931e2008-12-10 09:10:46 -0500581 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000582
Chris Mason459931e2008-12-10 09:10:46 -0500583 leaf = path->nodes[0];
584 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
585
586 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
587 key.type != BTRFS_EXTENT_CSUM_KEY) {
588 break;
589 }
590
591 if (key.offset >= end_byte)
592 break;
593
594 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
595 csum_end <<= blocksize_bits;
596 csum_end += key.offset;
597
598 /* this csum ends before we start, we're done */
599 if (csum_end <= bytenr)
600 break;
601
602 /* delete the entire item, it is inside our range */
603 if (key.offset >= bytenr && csum_end <= end_byte) {
604 ret = btrfs_del_item(trans, root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000605 if (ret)
606 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500607 if (key.offset == bytenr)
608 break;
Chris Mason459931e2008-12-10 09:10:46 -0500609 } else if (key.offset < bytenr && csum_end > end_byte) {
610 unsigned long offset;
611 unsigned long shift_len;
612 unsigned long item_offset;
613 /*
614 * [ bytenr - len ]
615 * [csum ]
616 *
617 * Our bytes are in the middle of the csum,
618 * we need to split this item and insert a new one.
619 *
620 * But we can't drop the path because the
621 * csum could change, get removed, extended etc.
622 *
623 * The trick here is the max size of a csum item leaves
624 * enough room in the tree block for a single
625 * item header. So, we split the item in place,
626 * adding a new header pointing to the existing
627 * bytes. Then we loop around again and we have
628 * a nicely formed csum item that we can neatly
629 * truncate.
630 */
631 offset = (bytenr - key.offset) >> blocksize_bits;
632 offset *= csum_size;
633
634 shift_len = (len >> blocksize_bits) * csum_size;
635
636 item_offset = btrfs_item_ptr_offset(leaf,
637 path->slots[0]);
638
639 memset_extent_buffer(leaf, 0, item_offset + offset,
640 shift_len);
641 key.offset = bytenr;
642
643 /*
644 * btrfs_split_item returns -EAGAIN when the
645 * item changed size or key
646 */
647 ret = btrfs_split_item(trans, root, path, &key, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100648 if (ret && ret != -EAGAIN) {
649 btrfs_abort_transaction(trans, root, ret);
650 goto out;
651 }
Chris Mason459931e2008-12-10 09:10:46 -0500652
653 key.offset = end_byte - 1;
654 } else {
Jeff Mahoney143bede2012-03-01 14:56:26 +0100655 truncate_one_csum(trans, root, path, &key, bytenr, len);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500656 if (key.offset < bytenr)
657 break;
Chris Mason459931e2008-12-10 09:10:46 -0500658 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200659 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500660 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000661 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500662out:
663 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000664 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500665}
666
Chris Mason065631f2008-02-20 12:07:25 -0500667int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500668 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400669 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400670{
Chris Masond20f7042008-12-08 16:58:54 -0500671 u64 bytenr;
Chris Masonf254e522007-03-29 15:15:27 -0400672 int ret;
673 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400674 struct btrfs_key found_key;
Chris Mason065631f2008-02-20 12:07:25 -0500675 u64 next_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400676 u64 total_bytes = 0;
Chris Mason065631f2008-02-20 12:07:25 -0500677 int found_next;
Chris Mason5caf2a02007-04-02 11:20:42 -0400678 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400679 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500680 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400681 struct extent_buffer *leaf = NULL;
Chris Mason6567e832007-04-16 09:22:45 -0400682 u64 csum_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400683 struct btrfs_sector_sum *sector_sum;
Chris Masonf578d4b2007-10-25 15:42:56 -0400684 u32 nritems;
685 u32 ins_size;
David Sterba6c417612011-04-13 15:41:04 +0200686 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500687
Chris Mason5caf2a02007-04-02 11:20:42 -0400688 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700689 if (!path)
690 return -ENOMEM;
691
Chris Masoned98b562008-07-22 23:06:42 -0400692 sector_sum = sums->sums;
Chris Mason065631f2008-02-20 12:07:25 -0500693again:
694 next_offset = (u64)-1;
695 found_next = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500696 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
697 file_key.offset = sector_sum->bytenr;
698 bytenr = sector_sum->bytenr;
699 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400700
Chris Masond20f7042008-12-08 16:58:54 -0500701 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400702 if (!IS_ERR(item)) {
703 leaf = path->nodes[0];
Chris Mason639cb582008-08-28 06:15:25 -0400704 ret = 0;
Chris Masona429e512007-04-18 16:15:28 -0400705 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400706 }
Chris Masona429e512007-04-18 16:15:28 -0400707 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400708 if (ret != -EFBIG && ret != -ENOENT)
709 goto fail_unlock;
710
Chris Masona429e512007-04-18 16:15:28 -0400711 if (ret == -EFBIG) {
712 u32 item_size;
713 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400714 leaf = path->nodes[0];
715 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500716 if ((item_size / csum_size) >=
717 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400718 /* already at max size, make a new one */
719 goto insert;
720 }
721 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400722 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400723 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400724 nritems = btrfs_header_nritems(path->nodes[0]);
725 if (path->slots[0] >= nritems - 1) {
726 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400727 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400728 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400729 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400730 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400731 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400732 }
733 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500734 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
735 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400736 found_next = 1;
737 goto insert;
738 }
739 next_offset = found_key.offset;
740 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400741 goto insert;
742 }
743
744 /*
745 * at this point, we know the tree has an item, but it isn't big
746 * enough yet to put our csum in. Grow it
747 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200748 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400749 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500750 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400751 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400752 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500753
754 if (ret > 0) {
755 if (path->slots[0] == 0)
756 goto insert;
757 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400758 }
Chris Mason459931e2008-12-10 09:10:46 -0500759
Chris Mason5f39d392007-10-15 16:14:19 -0400760 leaf = path->nodes[0];
761 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500762 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400763 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500764
Chris Masond20f7042008-12-08 16:58:54 -0500765 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
766 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500767 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400768 goto insert;
769 }
Chris Mason459931e2008-12-10 09:10:46 -0500770
Chris Mason5f39d392007-10-15 16:14:19 -0400771 if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500772 csum_size) {
773 u32 diff = (csum_offset + 1) * csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500774
775 /*
776 * is the item big enough already? we dropped our lock
777 * before and need to recheck
778 */
779 if (diff < btrfs_item_size_nr(leaf, path->slots[0]))
780 goto csum;
781
Chris Mason5f39d392007-10-15 16:14:19 -0400782 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Chris Masond3977122009-01-05 21:25:51 -0500783 if (diff != csum_size)
Chris Mason3a686372007-05-24 13:35:57 -0400784 goto insert;
Chris Mason459931e2008-12-10 09:10:46 -0500785
Jeff Mahoney143bede2012-03-01 14:56:26 +0100786 btrfs_extend_item(trans, root, path, diff);
Chris Mason6567e832007-04-16 09:22:45 -0400787 goto csum;
788 }
789
790insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200791 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400792 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400793 if (found_next) {
Chris Masond20f7042008-12-08 16:58:54 -0500794 u64 tmp = total_bytes + root->sectorsize;
795 u64 next_sector = sector_sum->bytenr;
796 struct btrfs_sector_sum *next = sector_sum + 1;
797
Chris Masond3977122009-01-05 21:25:51 -0500798 while (tmp < sums->len) {
Chris Masond20f7042008-12-08 16:58:54 -0500799 if (next_sector + root->sectorsize != next->bytenr)
800 break;
801 tmp += root->sectorsize;
802 next_sector = next->bytenr;
803 next++;
804 }
805 tmp = min(tmp, next_offset - file_key.offset);
Chris Masonf578d4b2007-10-25 15:42:56 -0400806 tmp >>= root->fs_info->sb->s_blocksize_bits;
807 tmp = max((u64)1, tmp);
Josef Bacik607d4322008-12-02 07:17:45 -0500808 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
809 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400810 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500811 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400812 }
Chris Masonb9473432009-03-13 11:00:37 -0400813 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400814 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400815 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400816 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400817 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400818 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400819 if (ret != 0) {
Chris Masona429e512007-04-18 16:15:28 -0400820 WARN_ON(1);
Chris Mason53863232008-08-15 15:34:18 -0400821 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400822 }
Chris Mason6567e832007-04-16 09:22:45 -0400823csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400824 leaf = path->nodes[0];
825 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Masonf254e522007-03-29 15:15:27 -0400826 ret = 0;
Chris Mason509659c2007-05-10 12:36:17 -0400827 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500828 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400829found:
Chris Mason065631f2008-02-20 12:07:25 -0500830 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
831 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
832 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masone6dcd2d2008-07-17 12:53:50 -0400833next_sector:
Chris Masonaadfeb62008-01-29 09:10:27 -0500834
Chris Masona6591712011-07-19 12:04:14 -0400835 write_extent_buffer(leaf, &sector_sum->sum, (unsigned long)item, csum_size);
Chris Mason7f3c74f2008-07-18 12:01:11 -0400836
Chris Masone6dcd2d2008-07-17 12:53:50 -0400837 total_bytes += root->sectorsize;
838 sector_sum++;
839 if (total_bytes < sums->len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500840 item = (struct btrfs_csum_item *)((char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500841 csum_size);
Chris Masond20f7042008-12-08 16:58:54 -0500842 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
843 sector_sum->bytenr) {
844 bytenr = sector_sum->bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400845 goto next_sector;
Chris Mason2e1a9922008-02-20 15:44:32 -0500846 }
Chris Mason065631f2008-02-20 12:07:25 -0500847 }
Chris Masona6591712011-07-19 12:04:14 -0400848
Chris Mason5caf2a02007-04-02 11:20:42 -0400849 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400850 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200851 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400852 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500853 goto again;
854 }
Chris Mason53863232008-08-15 15:34:18 -0400855out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400856 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400857 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400858
859fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400860 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400861}