blob: 18f12aab6ebf6ceefd08b5e305227730370c897e [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
Jan Schmidt995e01b2012-08-13 02:52:38 -060028#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((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
Zach Brown221b8312012-09-20 14:33:00 -060032#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
33 PAGE_CACHE_SIZE))
Chris Mason7ca4be42012-01-31 20:19:02 -050034
Yan Zheng07d400a2009-01-06 11:42:00 -050035#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
36 sizeof(struct btrfs_ordered_sum)) / \
37 sizeof(struct btrfs_sector_sum) * \
38 (r)->sectorsize - (r)->sectorsize)
39
Chris Masonb18c6682007-04-17 13:26:50 -040040int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
Sage Weilf2eb0a22008-05-02 14:43:14 -040041 struct btrfs_root *root,
42 u64 objectid, u64 pos,
43 u64 disk_offset, u64 disk_num_bytes,
Chris Masonc8b97812008-10-29 14:49:59 -040044 u64 num_bytes, u64 offset, u64 ram_bytes,
45 u8 compression, u8 encryption, u16 other_encoding)
Chris Mason9f5fae22007-03-20 14:38:32 -040046{
Chris Masondee26a92007-03-26 16:00:06 -040047 int ret = 0;
48 struct btrfs_file_extent_item *item;
49 struct btrfs_key file_key;
Chris Mason5caf2a02007-04-02 11:20:42 -040050 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040051 struct extent_buffer *leaf;
Chris Masondee26a92007-03-26 16:00:06 -040052
Chris Mason5caf2a02007-04-02 11:20:42 -040053 path = btrfs_alloc_path();
Tsutomu Itohdb5b4932011-03-23 08:14:16 +000054 if (!path)
55 return -ENOMEM;
Chris Masondee26a92007-03-26 16:00:06 -040056 file_key.objectid = objectid;
Chris Masonb18c6682007-04-17 13:26:50 -040057 file_key.offset = pos;
Chris Masondee26a92007-03-26 16:00:06 -040058 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
59
Chris Masonb9473432009-03-13 11:00:37 -040060 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -040061 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masondee26a92007-03-26 16:00:06 -040062 sizeof(*item));
Chris Mason54aa1f42007-06-22 14:16:25 -040063 if (ret < 0)
64 goto out;
Jeff Mahoney79787ea2012-03-12 16:03:00 +010065 BUG_ON(ret); /* Can't happen */
Chris Mason5f39d392007-10-15 16:14:19 -040066 leaf = path->nodes[0];
67 item = btrfs_item_ptr(leaf, path->slots[0],
Chris Masondee26a92007-03-26 16:00:06 -040068 struct btrfs_file_extent_item);
Sage Weilf2eb0a22008-05-02 14:43:14 -040069 btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
Chris Masondb945352007-10-15 16:15:53 -040070 btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
Sage Weilf2eb0a22008-05-02 14:43:14 -040071 btrfs_set_file_extent_offset(leaf, item, offset);
Chris Masondb945352007-10-15 16:15:53 -040072 btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
Chris Masonc8b97812008-10-29 14:49:59 -040073 btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
Chris Mason5f39d392007-10-15 16:14:19 -040074 btrfs_set_file_extent_generation(leaf, item, trans->transid);
75 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
Chris Masonc8b97812008-10-29 14:49:59 -040076 btrfs_set_file_extent_compression(leaf, item, compression);
77 btrfs_set_file_extent_encryption(leaf, item, encryption);
78 btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
79
Chris Mason5f39d392007-10-15 16:14:19 -040080 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -040081out:
Chris Mason5caf2a02007-04-02 11:20:42 -040082 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -040083 return ret;
Chris Mason9f5fae22007-03-20 14:38:32 -040084}
Chris Masondee26a92007-03-26 16:00:06 -040085
Chris Masonb18c6682007-04-17 13:26:50 -040086struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans,
87 struct btrfs_root *root,
88 struct btrfs_path *path,
Chris Masond20f7042008-12-08 16:58:54 -050089 u64 bytenr, int cow)
Chris Mason6567e832007-04-16 09:22:45 -040090{
91 int ret;
92 struct btrfs_key file_key;
93 struct btrfs_key found_key;
94 struct btrfs_csum_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040095 struct extent_buffer *leaf;
Chris Mason6567e832007-04-16 09:22:45 -040096 u64 csum_offset = 0;
David Sterba6c417612011-04-13 15:41:04 +020097 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040098 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -040099
Chris Masond20f7042008-12-08 16:58:54 -0500100 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
101 file_key.offset = bytenr;
102 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masonb18c6682007-04-17 13:26:50 -0400103 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -0400104 if (ret < 0)
105 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -0400106 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -0400107 if (ret > 0) {
108 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -0400109 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400110 goto fail;
111 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400112 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500113 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400114 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500115
116 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400117 root->fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400118 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500119 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400120
Miao Xie82d130f2013-03-28 08:12:15 +0000121 if (csum_offset == csums_in_item) {
Chris Masona429e512007-04-18 16:15:28 -0400122 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400123 goto fail;
Miao Xie82d130f2013-03-28 08:12:15 +0000124 } else if (csum_offset > csums_in_item) {
125 goto fail;
Chris Mason6567e832007-04-16 09:22:45 -0400126 }
127 }
128 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400129 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500130 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400131 return item;
132fail:
133 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400134 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400135 return ERR_PTR(ret);
136}
137
Chris Masondee26a92007-03-26 16:00:06 -0400138int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
139 struct btrfs_root *root,
140 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400141 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400142{
143 int ret;
144 struct btrfs_key file_key;
145 int ins_len = mod < 0 ? -1 : 0;
146 int cow = mod != 0;
147
148 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400149 file_key.offset = offset;
Chris Masondee26a92007-03-26 16:00:06 -0400150 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
151 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
152 return ret;
153}
Chris Masonf254e522007-03-29 15:15:27 -0400154
Miao Xie315a9852012-11-01 07:33:59 +0000155u64 btrfs_file_extent_length(struct btrfs_path *path)
156{
157 int extent_type;
158 struct btrfs_file_extent_item *fi;
159 u64 len;
160
161 fi = btrfs_item_ptr(path->nodes[0], path->slots[0],
162 struct btrfs_file_extent_item);
163 extent_type = btrfs_file_extent_type(path->nodes[0], fi);
164
165 if (extent_type == BTRFS_FILE_EXTENT_REG ||
166 extent_type == BTRFS_FILE_EXTENT_PREALLOC)
167 len = btrfs_file_extent_num_bytes(path->nodes[0], fi);
168 else if (extent_type == BTRFS_FILE_EXTENT_INLINE)
169 len = btrfs_file_extent_inline_len(path->nodes[0], fi);
170 else
171 BUG();
172
173 return len;
174}
Yan Zheng17d217f2008-12-12 10:03:38 -0500175
Josef Bacik4b46fce2010-05-23 11:00:55 -0400176static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
177 struct inode *inode, struct bio *bio,
178 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400179{
Miao Xiee4100d92013-04-05 07:20:56 +0000180 u32 sum[16];
181 int len;
Chris Mason61b49442008-07-31 15:42:53 -0400182 struct bio_vec *bvec = bio->bi_io_vec;
183 int bio_index = 0;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400184 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400185 u64 item_start_offset = 0;
186 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500187 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400188 u32 diff;
David Sterba6c417612011-04-13 15:41:04 +0200189 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Miao Xiee4100d92013-04-05 07:20:56 +0000190 int count;
Chris Mason61b49442008-07-31 15:42:53 -0400191 struct btrfs_path *path;
192 struct btrfs_csum_item *item = NULL;
193 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
194
195 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000196 if (!path)
197 return -ENOMEM;
Chris Mason4d1b5fb2008-08-20 09:44:52 -0400198 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
199 path->reada = 2;
Chris Mason61b49442008-07-31 15:42:53 -0400200
201 WARN_ON(bio->bi_vcnt <= 0);
202
Chris Mason2cf85722011-07-26 15:35:09 -0400203 /*
204 * the free space stuff is only read when it hasn't been
205 * updated in the current transaction. So, we can safely
206 * read from the commit root and sidestep a nasty deadlock
207 * between reading the free space cache and updating the csum tree.
208 */
Liu Bo83eea1f2012-07-10 05:28:39 -0600209 if (btrfs_is_free_space_inode(inode)) {
Chris Mason2cf85722011-07-26 15:35:09 -0400210 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400211 path->skip_locking = 1;
212 }
Chris Mason2cf85722011-07-26 15:35:09 -0400213
Chris Masond20f7042008-12-08 16:58:54 -0500214 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400215 if (dio)
216 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500217 while (bio_index < bio->bi_vcnt) {
Miao Xiee4100d92013-04-05 07:20:56 +0000218 len = min_t(int, ARRAY_SIZE(sum), bio->bi_vcnt - bio_index);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400219 if (!dio)
220 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Miao Xiee4100d92013-04-05 07:20:56 +0000221 count = btrfs_find_ordered_sum(inode, offset, disk_bytenr, sum,
222 len);
223 if (count)
Chris Mason61b49442008-07-31 15:42:53 -0400224 goto found;
225
Chris Masond20f7042008-12-08 16:58:54 -0500226 if (!item || disk_bytenr < item_start_offset ||
227 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400228 struct btrfs_key found_key;
229 u32 item_size;
230
231 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200232 btrfs_release_path(path);
Chris Masond20f7042008-12-08 16:58:54 -0500233 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
234 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400235 if (IS_ERR(item)) {
Miao Xiee4100d92013-04-05 07:20:56 +0000236 count = 1;
237 sum[0] = 0;
Yan Zheng17d217f2008-12-12 10:03:38 -0500238 if (BTRFS_I(inode)->root->root_key.objectid ==
239 BTRFS_DATA_RELOC_TREE_OBJECTID) {
240 set_extent_bits(io_tree, offset,
241 offset + bvec->bv_len - 1,
242 EXTENT_NODATASUM, GFP_NOFS);
243 } else {
Chris Masond3977122009-01-05 21:25:51 -0500244 printk(KERN_INFO "btrfs no csum found "
Li Zefan33345d012011-04-20 10:31:50 +0800245 "for inode %llu start %llu\n",
246 (unsigned long long)
247 btrfs_ino(inode),
Yan Zheng17d217f2008-12-12 10:03:38 -0500248 (unsigned long long)offset);
249 }
Chris Mason6dab8152008-08-04 08:35:53 -0400250 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200251 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400252 goto found;
253 }
254 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
255 path->slots[0]);
256
257 item_start_offset = found_key.offset;
258 item_size = btrfs_item_size_nr(path->nodes[0],
259 path->slots[0]);
260 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500261 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400262 root->sectorsize;
263 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
264 struct btrfs_csum_item);
265 }
266 /*
267 * this byte range must be able to fit inside
268 * a single leaf so it will also fit inside a u32
269 */
Chris Masond20f7042008-12-08 16:58:54 -0500270 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400271 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500272 diff = diff * csum_size;
Miao Xiee4100d92013-04-05 07:20:56 +0000273 count = min_t(int, len, (item_last_offset - disk_bytenr) >>
274 inode->i_sb->s_blocksize_bits);
275 read_extent_buffer(path->nodes[0], sum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400276 ((unsigned long)item) + diff,
Miao Xiee4100d92013-04-05 07:20:56 +0000277 csum_size * count);
Chris Mason61b49442008-07-31 15:42:53 -0400278found:
Miao Xiee4100d92013-04-05 07:20:56 +0000279 if (dst) {
280 memcpy(dst, sum, count * csum_size);
281 dst += count;
282 } else {
283 if (dio)
284 extent_cache_csums_dio(io_tree, offset, sum,
285 count);
286 else
287 extent_cache_csums(io_tree, bio, bio_index, sum,
288 count);
289 }
290 while (count--) {
291 disk_bytenr += bvec->bv_len;
292 offset += bvec->bv_len;
293 bio_index++;
294 bvec++;
295 }
Chris Mason61b49442008-07-31 15:42:53 -0400296 }
297 btrfs_free_path(path);
298 return 0;
299}
300
Josef Bacik4b46fce2010-05-23 11:00:55 -0400301int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
302 struct bio *bio, u32 *dst)
303{
304 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
305}
306
307int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
Josef Bacikc3298612012-08-03 16:49:19 -0400308 struct bio *bio, u64 offset)
Josef Bacik4b46fce2010-05-23 11:00:55 -0400309{
Josef Bacikc3298612012-08-03 16:49:19 -0400310 return __btrfs_lookup_bio_sums(root, inode, bio, offset, NULL, 1);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400311}
312
Yan Zheng17d217f2008-12-12 10:03:38 -0500313int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100314 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500315{
316 struct btrfs_key key;
317 struct btrfs_path *path;
318 struct extent_buffer *leaf;
319 struct btrfs_ordered_sum *sums;
320 struct btrfs_sector_sum *sector_sum;
321 struct btrfs_csum_item *item;
Mark Fasheh0678b612011-08-05 15:46:16 -0700322 LIST_HEAD(tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500323 unsigned long offset;
324 int ret;
325 size_t size;
326 u64 csum_end;
David Sterba6c417612011-04-13 15:41:04 +0200327 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500328
329 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700330 if (!path)
331 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500332
Arne Jansena2de7332011-03-08 14:14:00 +0100333 if (search_commit) {
334 path->skip_locking = 1;
335 path->reada = 2;
336 path->search_commit_root = 1;
337 }
338
Yan Zheng17d217f2008-12-12 10:03:38 -0500339 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
340 key.offset = start;
341 key.type = BTRFS_EXTENT_CSUM_KEY;
342
Yan Zheng07d400a2009-01-06 11:42:00 -0500343 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500344 if (ret < 0)
345 goto fail;
346 if (ret > 0 && path->slots[0] > 0) {
347 leaf = path->nodes[0];
348 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
349 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
350 key.type == BTRFS_EXTENT_CSUM_KEY) {
351 offset = (start - key.offset) >>
352 root->fs_info->sb->s_blocksize_bits;
353 if (offset * csum_size <
354 btrfs_item_size_nr(leaf, path->slots[0] - 1))
355 path->slots[0]--;
356 }
357 }
358
359 while (start <= end) {
360 leaf = path->nodes[0];
361 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500362 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500363 if (ret < 0)
364 goto fail;
365 if (ret > 0)
366 break;
367 leaf = path->nodes[0];
368 }
369
370 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
371 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Zhi Yong Wu628c8282013-03-18 09:18:09 +0000372 key.type != BTRFS_EXTENT_CSUM_KEY ||
373 key.offset > end)
Yan Zheng17d217f2008-12-12 10:03:38 -0500374 break;
375
376 if (key.offset > start)
377 start = key.offset;
378
379 size = btrfs_item_size_nr(leaf, path->slots[0]);
380 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500381 if (csum_end <= start) {
382 path->slots[0]++;
383 continue;
384 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500385
Yan Zheng07d400a2009-01-06 11:42:00 -0500386 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500387 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
388 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500389 while (start < csum_end) {
390 size = min_t(size_t, csum_end - start,
391 MAX_ORDERED_SUM_BYTES(root));
392 sums = kzalloc(btrfs_ordered_sum_size(root, size),
393 GFP_NOFS);
Mark Fasheh0678b612011-08-05 15:46:16 -0700394 if (!sums) {
395 ret = -ENOMEM;
396 goto fail;
397 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500398
Yan Zheng07d400a2009-01-06 11:42:00 -0500399 sector_sum = sums->sums;
400 sums->bytenr = start;
401 sums->len = size;
402
403 offset = (start - key.offset) >>
404 root->fs_info->sb->s_blocksize_bits;
405 offset *= csum_size;
406
407 while (size > 0) {
408 read_extent_buffer(path->nodes[0],
409 &sector_sum->sum,
410 ((unsigned long)item) +
411 offset, csum_size);
412 sector_sum->bytenr = start;
413
414 size -= root->sectorsize;
415 start += root->sectorsize;
416 offset += csum_size;
417 sector_sum++;
418 }
Mark Fasheh0678b612011-08-05 15:46:16 -0700419 list_add_tail(&sums->list, &tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500420 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500421 path->slots[0]++;
422 }
423 ret = 0;
424fail:
Mark Fasheh0678b612011-08-05 15:46:16 -0700425 while (ret < 0 && !list_empty(&tmplist)) {
426 sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
427 list_del(&sums->list);
428 kfree(sums);
429 }
430 list_splice_tail(&tmplist, list);
431
Yan Zheng17d217f2008-12-12 10:03:38 -0500432 btrfs_free_path(path);
433 return ret;
434}
435
Chris Mason3edf7d32008-07-18 06:17:13 -0400436int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
Chris Masond20f7042008-12-08 16:58:54 -0500437 struct bio *bio, u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400438{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400439 struct btrfs_ordered_sum *sums;
440 struct btrfs_sector_sum *sector_sum;
Chris Mason3edf7d32008-07-18 06:17:13 -0400441 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400442 char *data;
443 struct bio_vec *bvec = bio->bi_io_vec;
444 int bio_index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400445 unsigned long total_bytes = 0;
446 unsigned long this_sum_bytes = 0;
447 u64 offset;
Chris Masond20f7042008-12-08 16:58:54 -0500448 u64 disk_bytenr;
Chris Masone0156402008-04-16 11:15:20 -0400449
Chris Masone6dcd2d2008-07-17 12:53:50 -0400450 WARN_ON(bio->bi_vcnt <= 0);
451 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400452 if (!sums)
453 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400454
Chris Masoned98b562008-07-22 23:06:42 -0400455 sector_sum = sums->sums;
Chris Masond20f7042008-12-08 16:58:54 -0500456 disk_bytenr = (u64)bio->bi_sector << 9;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400457 sums->len = bio->bi_size;
458 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500459
460 if (contig)
461 offset = file_start;
462 else
463 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
464
465 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100466 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500467 sums->bytenr = ordered->start;
Chris Masone0156402008-04-16 11:15:20 -0400468
Chris Masond3977122009-01-05 21:25:51 -0500469 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500470 if (!contig)
471 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
472
Josef Bacike58dd742013-01-22 15:43:09 -0500473 if (offset >= ordered->file_offset + ordered->len ||
474 offset < ordered->file_offset) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400475 unsigned long bytes_left;
476 sums->len = this_sum_bytes;
477 this_sum_bytes = 0;
478 btrfs_add_ordered_sum(inode, ordered, sums);
479 btrfs_put_ordered_extent(ordered);
480
481 bytes_left = bio->bi_size - total_bytes;
482
483 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
484 GFP_NOFS);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100485 BUG_ON(!sums); /* -ENOMEM */
Chris Masoned98b562008-07-22 23:06:42 -0400486 sector_sum = sums->sums;
Chris Mason3edf7d32008-07-18 06:17:13 -0400487 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500488 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100489 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500490 sums->bytenr = ordered->start;
Chris Mason3edf7d32008-07-18 06:17:13 -0400491 }
492
Cong Wang7ac687d2011-11-25 23:14:28 +0800493 data = kmap_atomic(bvec->bv_page);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400494 sector_sum->sum = ~(u32)0;
Liu Bob0496682013-03-14 14:57:45 +0000495 sector_sum->sum = btrfs_csum_data(data + bvec->bv_offset,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400496 sector_sum->sum,
497 bvec->bv_len);
Cong Wang7ac687d2011-11-25 23:14:28 +0800498 kunmap_atomic(data);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400499 btrfs_csum_final(sector_sum->sum,
500 (char *)&sector_sum->sum);
Chris Masond20f7042008-12-08 16:58:54 -0500501 sector_sum->bytenr = disk_bytenr;
Chris Masoned98b562008-07-22 23:06:42 -0400502
Chris Masone6dcd2d2008-07-17 12:53:50 -0400503 sector_sum++;
Chris Masone0156402008-04-16 11:15:20 -0400504 bio_index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400505 total_bytes += bvec->bv_len;
506 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500507 disk_bytenr += bvec->bv_len;
508 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400509 bvec++;
510 }
Chris Masoned98b562008-07-22 23:06:42 -0400511 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400512 btrfs_add_ordered_sum(inode, ordered, sums);
513 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400514 return 0;
515}
516
Chris Mason459931e2008-12-10 09:10:46 -0500517/*
518 * helper function for csum removal, this expects the
519 * key to describe the csum pointed to by the path, and it expects
520 * the csum to overlap the range [bytenr, len]
521 *
522 * The csum should not be entirely contained in the range and the
523 * range should not be entirely contained in the csum.
524 *
525 * This calls btrfs_truncate_item with the correct args based on the
526 * overlap, and fixes up the key as required.
527 */
Jeff Mahoney143bede2012-03-01 14:56:26 +0100528static noinline void truncate_one_csum(struct btrfs_trans_handle *trans,
529 struct btrfs_root *root,
530 struct btrfs_path *path,
531 struct btrfs_key *key,
532 u64 bytenr, u64 len)
Chris Mason459931e2008-12-10 09:10:46 -0500533{
534 struct extent_buffer *leaf;
David Sterba6c417612011-04-13 15:41:04 +0200535 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500536 u64 csum_end;
537 u64 end_byte = bytenr + len;
538 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500539
540 leaf = path->nodes[0];
541 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
542 csum_end <<= root->fs_info->sb->s_blocksize_bits;
543 csum_end += key->offset;
544
545 if (key->offset < bytenr && csum_end <= end_byte) {
546 /*
547 * [ bytenr - len ]
548 * [ ]
549 * [csum ]
550 * A simple truncate off the end of the item
551 */
552 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
553 new_size *= csum_size;
Jeff Mahoney143bede2012-03-01 14:56:26 +0100554 btrfs_truncate_item(trans, root, path, new_size, 1);
Chris Mason459931e2008-12-10 09:10:46 -0500555 } else if (key->offset >= bytenr && csum_end > end_byte &&
556 end_byte > key->offset) {
557 /*
558 * [ bytenr - len ]
559 * [ ]
560 * [csum ]
561 * we need to truncate from the beginning of the csum
562 */
563 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
564 new_size *= csum_size;
565
Jeff Mahoney143bede2012-03-01 14:56:26 +0100566 btrfs_truncate_item(trans, root, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500567
568 key->offset = end_byte;
Jeff Mahoney143bede2012-03-01 14:56:26 +0100569 btrfs_set_item_key_safe(trans, root, path, key);
Chris Mason459931e2008-12-10 09:10:46 -0500570 } else {
571 BUG();
572 }
Chris Mason459931e2008-12-10 09:10:46 -0500573}
574
575/*
576 * deletes the csum items from the csum tree for a given
577 * range of bytes.
578 */
579int btrfs_del_csums(struct btrfs_trans_handle *trans,
580 struct btrfs_root *root, u64 bytenr, u64 len)
581{
582 struct btrfs_path *path;
583 struct btrfs_key key;
584 u64 end_byte = bytenr + len;
585 u64 csum_end;
586 struct extent_buffer *leaf;
587 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200588 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500589 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
590
591 root = root->fs_info->csum_root;
592
593 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000594 if (!path)
595 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500596
Chris Masond3977122009-01-05 21:25:51 -0500597 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500598 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
599 key.offset = end_byte - 1;
600 key.type = BTRFS_EXTENT_CSUM_KEY;
601
Chris Masonb9473432009-03-13 11:00:37 -0400602 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500603 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
604 if (ret > 0) {
605 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000606 break;
Chris Mason459931e2008-12-10 09:10:46 -0500607 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000608 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000609 break;
Chris Mason459931e2008-12-10 09:10:46 -0500610 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000611
Chris Mason459931e2008-12-10 09:10:46 -0500612 leaf = path->nodes[0];
613 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
614
615 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
616 key.type != BTRFS_EXTENT_CSUM_KEY) {
617 break;
618 }
619
620 if (key.offset >= end_byte)
621 break;
622
623 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
624 csum_end <<= blocksize_bits;
625 csum_end += key.offset;
626
627 /* this csum ends before we start, we're done */
628 if (csum_end <= bytenr)
629 break;
630
631 /* delete the entire item, it is inside our range */
632 if (key.offset >= bytenr && csum_end <= end_byte) {
633 ret = btrfs_del_item(trans, root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000634 if (ret)
635 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500636 if (key.offset == bytenr)
637 break;
Chris Mason459931e2008-12-10 09:10:46 -0500638 } else if (key.offset < bytenr && csum_end > end_byte) {
639 unsigned long offset;
640 unsigned long shift_len;
641 unsigned long item_offset;
642 /*
643 * [ bytenr - len ]
644 * [csum ]
645 *
646 * Our bytes are in the middle of the csum,
647 * we need to split this item and insert a new one.
648 *
649 * But we can't drop the path because the
650 * csum could change, get removed, extended etc.
651 *
652 * The trick here is the max size of a csum item leaves
653 * enough room in the tree block for a single
654 * item header. So, we split the item in place,
655 * adding a new header pointing to the existing
656 * bytes. Then we loop around again and we have
657 * a nicely formed csum item that we can neatly
658 * truncate.
659 */
660 offset = (bytenr - key.offset) >> blocksize_bits;
661 offset *= csum_size;
662
663 shift_len = (len >> blocksize_bits) * csum_size;
664
665 item_offset = btrfs_item_ptr_offset(leaf,
666 path->slots[0]);
667
668 memset_extent_buffer(leaf, 0, item_offset + offset,
669 shift_len);
670 key.offset = bytenr;
671
672 /*
673 * btrfs_split_item returns -EAGAIN when the
674 * item changed size or key
675 */
676 ret = btrfs_split_item(trans, root, path, &key, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100677 if (ret && ret != -EAGAIN) {
678 btrfs_abort_transaction(trans, root, ret);
679 goto out;
680 }
Chris Mason459931e2008-12-10 09:10:46 -0500681
682 key.offset = end_byte - 1;
683 } else {
Jeff Mahoney143bede2012-03-01 14:56:26 +0100684 truncate_one_csum(trans, root, path, &key, bytenr, len);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500685 if (key.offset < bytenr)
686 break;
Chris Mason459931e2008-12-10 09:10:46 -0500687 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200688 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500689 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000690 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500691out:
692 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000693 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500694}
695
Liu Bo2f697dc2013-02-04 13:12:18 +0000696static u64 btrfs_sector_sum_left(struct btrfs_ordered_sum *sums,
697 struct btrfs_sector_sum *sector_sum,
698 u64 total_bytes, u64 sectorsize)
699{
700 u64 tmp = sectorsize;
701 u64 next_sector = sector_sum->bytenr;
702 struct btrfs_sector_sum *next = sector_sum + 1;
703
704 while ((tmp + total_bytes) < sums->len) {
705 if (next_sector + sectorsize != next->bytenr)
706 break;
707 tmp += sectorsize;
708 next_sector = next->bytenr;
709 next++;
710 }
711 return tmp;
712}
713
Chris Mason065631f2008-02-20 12:07:25 -0500714int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500715 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400716 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400717{
Chris Masond20f7042008-12-08 16:58:54 -0500718 u64 bytenr;
Chris Masonf254e522007-03-29 15:15:27 -0400719 int ret;
720 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400721 struct btrfs_key found_key;
Chris Mason065631f2008-02-20 12:07:25 -0500722 u64 next_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400723 u64 total_bytes = 0;
Chris Mason065631f2008-02-20 12:07:25 -0500724 int found_next;
Chris Mason5caf2a02007-04-02 11:20:42 -0400725 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400726 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500727 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400728 struct extent_buffer *leaf = NULL;
Chris Mason6567e832007-04-16 09:22:45 -0400729 u64 csum_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400730 struct btrfs_sector_sum *sector_sum;
Chris Masonf578d4b2007-10-25 15:42:56 -0400731 u32 nritems;
732 u32 ins_size;
David Sterba6c417612011-04-13 15:41:04 +0200733 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500734
Chris Mason5caf2a02007-04-02 11:20:42 -0400735 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700736 if (!path)
737 return -ENOMEM;
738
Chris Masoned98b562008-07-22 23:06:42 -0400739 sector_sum = sums->sums;
Chris Mason065631f2008-02-20 12:07:25 -0500740again:
741 next_offset = (u64)-1;
742 found_next = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500743 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
744 file_key.offset = sector_sum->bytenr;
745 bytenr = sector_sum->bytenr;
746 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400747
Chris Masond20f7042008-12-08 16:58:54 -0500748 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400749 if (!IS_ERR(item)) {
750 leaf = path->nodes[0];
Chris Mason639cb582008-08-28 06:15:25 -0400751 ret = 0;
Chris Masona429e512007-04-18 16:15:28 -0400752 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400753 }
Chris Masona429e512007-04-18 16:15:28 -0400754 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400755 if (ret != -EFBIG && ret != -ENOENT)
756 goto fail_unlock;
757
Chris Masona429e512007-04-18 16:15:28 -0400758 if (ret == -EFBIG) {
759 u32 item_size;
760 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400761 leaf = path->nodes[0];
762 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500763 if ((item_size / csum_size) >=
764 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400765 /* already at max size, make a new one */
766 goto insert;
767 }
768 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400769 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400770 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400771 nritems = btrfs_header_nritems(path->nodes[0]);
772 if (path->slots[0] >= nritems - 1) {
773 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400774 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400775 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400776 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400777 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400778 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400779 }
780 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500781 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
782 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400783 found_next = 1;
784 goto insert;
785 }
786 next_offset = found_key.offset;
787 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400788 goto insert;
789 }
790
791 /*
792 * at this point, we know the tree has an item, but it isn't big
793 * enough yet to put our csum in. Grow it
794 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200795 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400796 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500797 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400798 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400799 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500800
801 if (ret > 0) {
802 if (path->slots[0] == 0)
803 goto insert;
804 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400805 }
Chris Mason459931e2008-12-10 09:10:46 -0500806
Chris Mason5f39d392007-10-15 16:14:19 -0400807 leaf = path->nodes[0];
808 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500809 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400810 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500811
Chris Masond20f7042008-12-08 16:58:54 -0500812 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
813 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500814 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400815 goto insert;
816 }
Chris Mason459931e2008-12-10 09:10:46 -0500817
Liu Bo2f697dc2013-02-04 13:12:18 +0000818 if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500819 csum_size) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000820 int extend_nr;
821 u64 tmp;
822 u32 diff;
823 u32 free_space;
Chris Mason459931e2008-12-10 09:10:46 -0500824
Liu Bo2f697dc2013-02-04 13:12:18 +0000825 if (btrfs_leaf_free_space(root, leaf) <
826 sizeof(struct btrfs_item) + csum_size * 2)
827 goto insert;
828
829 free_space = btrfs_leaf_free_space(root, leaf) -
830 sizeof(struct btrfs_item) - csum_size;
831 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
832 root->sectorsize);
833 tmp >>= root->fs_info->sb->s_blocksize_bits;
834 WARN_ON(tmp < 1);
835
836 extend_nr = max_t(int, 1, (int)tmp);
837 diff = (csum_offset + extend_nr) * csum_size;
838 diff = min(diff, MAX_CSUM_ITEMS(root, csum_size) * csum_size);
Chris Mason459931e2008-12-10 09:10:46 -0500839
Chris Mason5f39d392007-10-15 16:14:19 -0400840 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Liu Bo2f697dc2013-02-04 13:12:18 +0000841 diff = min(free_space, diff);
842 diff /= csum_size;
843 diff *= csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500844
Jeff Mahoney143bede2012-03-01 14:56:26 +0100845 btrfs_extend_item(trans, root, path, diff);
Chris Mason6567e832007-04-16 09:22:45 -0400846 goto csum;
847 }
848
849insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200850 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400851 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400852 if (found_next) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000853 u64 tmp;
Chris Masond20f7042008-12-08 16:58:54 -0500854
Liu Bo2f697dc2013-02-04 13:12:18 +0000855 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
856 root->sectorsize);
Chris Masonf578d4b2007-10-25 15:42:56 -0400857 tmp >>= root->fs_info->sb->s_blocksize_bits;
Liu Bo2f697dc2013-02-04 13:12:18 +0000858 tmp = min(tmp, (next_offset - file_key.offset) >>
859 root->fs_info->sb->s_blocksize_bits);
860
Chris Masonf578d4b2007-10-25 15:42:56 -0400861 tmp = max((u64)1, tmp);
Josef Bacik607d4322008-12-02 07:17:45 -0500862 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
863 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400864 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500865 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400866 }
Chris Masonb9473432009-03-13 11:00:37 -0400867 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400868 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400869 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400870 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400871 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400872 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400873 if (ret != 0) {
Chris Masona429e512007-04-18 16:15:28 -0400874 WARN_ON(1);
Chris Mason53863232008-08-15 15:34:18 -0400875 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400876 }
Chris Mason6567e832007-04-16 09:22:45 -0400877csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400878 leaf = path->nodes[0];
879 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Masonf254e522007-03-29 15:15:27 -0400880 ret = 0;
Chris Mason509659c2007-05-10 12:36:17 -0400881 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500882 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400883found:
Chris Mason065631f2008-02-20 12:07:25 -0500884 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
885 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
886 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masone6dcd2d2008-07-17 12:53:50 -0400887next_sector:
Chris Masonaadfeb62008-01-29 09:10:27 -0500888
Chris Masona6591712011-07-19 12:04:14 -0400889 write_extent_buffer(leaf, &sector_sum->sum, (unsigned long)item, csum_size);
Chris Mason7f3c74f2008-07-18 12:01:11 -0400890
Chris Masone6dcd2d2008-07-17 12:53:50 -0400891 total_bytes += root->sectorsize;
892 sector_sum++;
893 if (total_bytes < sums->len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500894 item = (struct btrfs_csum_item *)((char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500895 csum_size);
Chris Masond20f7042008-12-08 16:58:54 -0500896 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
897 sector_sum->bytenr) {
898 bytenr = sector_sum->bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400899 goto next_sector;
Chris Mason2e1a9922008-02-20 15:44:32 -0500900 }
Chris Mason065631f2008-02-20 12:07:25 -0500901 }
Chris Masona6591712011-07-19 12:04:14 -0400902
Chris Mason5caf2a02007-04-02 11:20:42 -0400903 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400904 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200905 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400906 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500907 goto again;
908 }
Chris Mason53863232008-08-15 15:34:18 -0400909out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400910 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400911 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400912
913fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400914 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400915}