blob: b193bf324a4123685483a7754537938267813734 [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
Eric Sandeen48a3b632013-04-25 20:41:01 +000086static struct btrfs_csum_item *
87btrfs_lookup_csum(struct btrfs_trans_handle *trans,
88 struct btrfs_root *root,
89 struct btrfs_path *path,
90 u64 bytenr, int cow)
Chris Mason6567e832007-04-16 09:22:45 -040091{
92 int ret;
93 struct btrfs_key file_key;
94 struct btrfs_key found_key;
95 struct btrfs_csum_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040096 struct extent_buffer *leaf;
Chris Mason6567e832007-04-16 09:22:45 -040097 u64 csum_offset = 0;
David Sterba6c417612011-04-13 15:41:04 +020098 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040099 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -0400100
Chris Masond20f7042008-12-08 16:58:54 -0500101 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
102 file_key.offset = bytenr;
103 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masonb18c6682007-04-17 13:26:50 -0400104 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -0400105 if (ret < 0)
106 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -0400107 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -0400108 if (ret > 0) {
109 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -0400110 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400111 goto fail;
112 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400113 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500114 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400115 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500116
117 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400118 root->fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400119 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500120 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400121
Miao Xie82d130f2013-03-28 08:12:15 +0000122 if (csum_offset == csums_in_item) {
Chris Masona429e512007-04-18 16:15:28 -0400123 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400124 goto fail;
Miao Xie82d130f2013-03-28 08:12:15 +0000125 } else if (csum_offset > csums_in_item) {
126 goto fail;
Chris Mason6567e832007-04-16 09:22:45 -0400127 }
128 }
129 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400130 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500131 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400132 return item;
133fail:
134 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400135 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400136 return ERR_PTR(ret);
137}
138
Chris Masondee26a92007-03-26 16:00:06 -0400139int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
140 struct btrfs_root *root,
141 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400142 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400143{
144 int ret;
145 struct btrfs_key file_key;
146 int ins_len = mod < 0 ? -1 : 0;
147 int cow = mod != 0;
148
149 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400150 file_key.offset = offset;
Chris Masondee26a92007-03-26 16:00:06 -0400151 btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY);
152 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
153 return ret;
154}
Chris Masonf254e522007-03-29 15:15:27 -0400155
Josef Bacik4b46fce2010-05-23 11:00:55 -0400156static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
157 struct inode *inode, struct bio *bio,
158 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400159{
Miao Xiee4100d92013-04-05 07:20:56 +0000160 u32 sum[16];
161 int len;
Chris Mason61b49442008-07-31 15:42:53 -0400162 struct bio_vec *bvec = bio->bi_io_vec;
163 int bio_index = 0;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400164 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400165 u64 item_start_offset = 0;
166 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500167 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400168 u32 diff;
David Sterba6c417612011-04-13 15:41:04 +0200169 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Miao Xiee4100d92013-04-05 07:20:56 +0000170 int count;
Chris Mason61b49442008-07-31 15:42:53 -0400171 struct btrfs_path *path;
172 struct btrfs_csum_item *item = NULL;
173 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
174
175 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000176 if (!path)
177 return -ENOMEM;
Chris Mason4d1b5fb2008-08-20 09:44:52 -0400178 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
179 path->reada = 2;
Chris Mason61b49442008-07-31 15:42:53 -0400180
181 WARN_ON(bio->bi_vcnt <= 0);
182
Chris Mason2cf85722011-07-26 15:35:09 -0400183 /*
184 * the free space stuff is only read when it hasn't been
185 * updated in the current transaction. So, we can safely
186 * read from the commit root and sidestep a nasty deadlock
187 * between reading the free space cache and updating the csum tree.
188 */
Liu Bo83eea1f2012-07-10 05:28:39 -0600189 if (btrfs_is_free_space_inode(inode)) {
Chris Mason2cf85722011-07-26 15:35:09 -0400190 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400191 path->skip_locking = 1;
192 }
Chris Mason2cf85722011-07-26 15:35:09 -0400193
Chris Masond20f7042008-12-08 16:58:54 -0500194 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400195 if (dio)
196 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500197 while (bio_index < bio->bi_vcnt) {
Miao Xiee4100d92013-04-05 07:20:56 +0000198 len = min_t(int, ARRAY_SIZE(sum), bio->bi_vcnt - bio_index);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400199 if (!dio)
200 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Miao Xiee4100d92013-04-05 07:20:56 +0000201 count = btrfs_find_ordered_sum(inode, offset, disk_bytenr, sum,
202 len);
203 if (count)
Chris Mason61b49442008-07-31 15:42:53 -0400204 goto found;
205
Chris Masond20f7042008-12-08 16:58:54 -0500206 if (!item || disk_bytenr < item_start_offset ||
207 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400208 struct btrfs_key found_key;
209 u32 item_size;
210
211 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200212 btrfs_release_path(path);
Chris Masond20f7042008-12-08 16:58:54 -0500213 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
214 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400215 if (IS_ERR(item)) {
Miao Xiee4100d92013-04-05 07:20:56 +0000216 count = 1;
217 sum[0] = 0;
Yan Zheng17d217f2008-12-12 10:03:38 -0500218 if (BTRFS_I(inode)->root->root_key.objectid ==
219 BTRFS_DATA_RELOC_TREE_OBJECTID) {
220 set_extent_bits(io_tree, offset,
221 offset + bvec->bv_len - 1,
222 EXTENT_NODATASUM, GFP_NOFS);
223 } else {
Chris Masond3977122009-01-05 21:25:51 -0500224 printk(KERN_INFO "btrfs no csum found "
Li Zefan33345d012011-04-20 10:31:50 +0800225 "for inode %llu start %llu\n",
226 (unsigned long long)
227 btrfs_ino(inode),
Yan Zheng17d217f2008-12-12 10:03:38 -0500228 (unsigned long long)offset);
229 }
Chris Mason6dab8152008-08-04 08:35:53 -0400230 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200231 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400232 goto found;
233 }
234 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
235 path->slots[0]);
236
237 item_start_offset = found_key.offset;
238 item_size = btrfs_item_size_nr(path->nodes[0],
239 path->slots[0]);
240 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500241 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400242 root->sectorsize;
243 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
244 struct btrfs_csum_item);
245 }
246 /*
247 * this byte range must be able to fit inside
248 * a single leaf so it will also fit inside a u32
249 */
Chris Masond20f7042008-12-08 16:58:54 -0500250 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400251 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500252 diff = diff * csum_size;
Miao Xiee4100d92013-04-05 07:20:56 +0000253 count = min_t(int, len, (item_last_offset - disk_bytenr) >>
254 inode->i_sb->s_blocksize_bits);
255 read_extent_buffer(path->nodes[0], sum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400256 ((unsigned long)item) + diff,
Miao Xiee4100d92013-04-05 07:20:56 +0000257 csum_size * count);
Chris Mason61b49442008-07-31 15:42:53 -0400258found:
Miao Xiee4100d92013-04-05 07:20:56 +0000259 if (dst) {
260 memcpy(dst, sum, count * csum_size);
261 dst += count;
262 } else {
263 if (dio)
264 extent_cache_csums_dio(io_tree, offset, sum,
265 count);
266 else
267 extent_cache_csums(io_tree, bio, bio_index, sum,
268 count);
269 }
270 while (count--) {
271 disk_bytenr += bvec->bv_len;
272 offset += bvec->bv_len;
273 bio_index++;
274 bvec++;
275 }
Chris Mason61b49442008-07-31 15:42:53 -0400276 }
277 btrfs_free_path(path);
278 return 0;
279}
280
Josef Bacik4b46fce2010-05-23 11:00:55 -0400281int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
282 struct bio *bio, u32 *dst)
283{
284 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
285}
286
287int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
Josef Bacikc3298612012-08-03 16:49:19 -0400288 struct bio *bio, u64 offset)
Josef Bacik4b46fce2010-05-23 11:00:55 -0400289{
Josef Bacikc3298612012-08-03 16:49:19 -0400290 return __btrfs_lookup_bio_sums(root, inode, bio, offset, NULL, 1);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400291}
292
Yan Zheng17d217f2008-12-12 10:03:38 -0500293int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100294 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500295{
296 struct btrfs_key key;
297 struct btrfs_path *path;
298 struct extent_buffer *leaf;
299 struct btrfs_ordered_sum *sums;
300 struct btrfs_sector_sum *sector_sum;
301 struct btrfs_csum_item *item;
Mark Fasheh0678b612011-08-05 15:46:16 -0700302 LIST_HEAD(tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500303 unsigned long offset;
304 int ret;
305 size_t size;
306 u64 csum_end;
David Sterba6c417612011-04-13 15:41:04 +0200307 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500308
309 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700310 if (!path)
311 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500312
Arne Jansena2de7332011-03-08 14:14:00 +0100313 if (search_commit) {
314 path->skip_locking = 1;
315 path->reada = 2;
316 path->search_commit_root = 1;
317 }
318
Yan Zheng17d217f2008-12-12 10:03:38 -0500319 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
320 key.offset = start;
321 key.type = BTRFS_EXTENT_CSUM_KEY;
322
Yan Zheng07d400a2009-01-06 11:42:00 -0500323 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500324 if (ret < 0)
325 goto fail;
326 if (ret > 0 && path->slots[0] > 0) {
327 leaf = path->nodes[0];
328 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
329 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
330 key.type == BTRFS_EXTENT_CSUM_KEY) {
331 offset = (start - key.offset) >>
332 root->fs_info->sb->s_blocksize_bits;
333 if (offset * csum_size <
334 btrfs_item_size_nr(leaf, path->slots[0] - 1))
335 path->slots[0]--;
336 }
337 }
338
339 while (start <= end) {
340 leaf = path->nodes[0];
341 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500342 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500343 if (ret < 0)
344 goto fail;
345 if (ret > 0)
346 break;
347 leaf = path->nodes[0];
348 }
349
350 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
351 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Zhi Yong Wu628c8282013-03-18 09:18:09 +0000352 key.type != BTRFS_EXTENT_CSUM_KEY ||
353 key.offset > end)
Yan Zheng17d217f2008-12-12 10:03:38 -0500354 break;
355
356 if (key.offset > start)
357 start = key.offset;
358
359 size = btrfs_item_size_nr(leaf, path->slots[0]);
360 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500361 if (csum_end <= start) {
362 path->slots[0]++;
363 continue;
364 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500365
Yan Zheng07d400a2009-01-06 11:42:00 -0500366 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500367 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
368 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500369 while (start < csum_end) {
370 size = min_t(size_t, csum_end - start,
371 MAX_ORDERED_SUM_BYTES(root));
372 sums = kzalloc(btrfs_ordered_sum_size(root, size),
373 GFP_NOFS);
Mark Fasheh0678b612011-08-05 15:46:16 -0700374 if (!sums) {
375 ret = -ENOMEM;
376 goto fail;
377 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500378
Yan Zheng07d400a2009-01-06 11:42:00 -0500379 sector_sum = sums->sums;
380 sums->bytenr = start;
381 sums->len = size;
382
383 offset = (start - key.offset) >>
384 root->fs_info->sb->s_blocksize_bits;
385 offset *= csum_size;
386
387 while (size > 0) {
388 read_extent_buffer(path->nodes[0],
389 &sector_sum->sum,
390 ((unsigned long)item) +
391 offset, csum_size);
392 sector_sum->bytenr = start;
393
394 size -= root->sectorsize;
395 start += root->sectorsize;
396 offset += csum_size;
397 sector_sum++;
398 }
Mark Fasheh0678b612011-08-05 15:46:16 -0700399 list_add_tail(&sums->list, &tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500400 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500401 path->slots[0]++;
402 }
403 ret = 0;
404fail:
Mark Fasheh0678b612011-08-05 15:46:16 -0700405 while (ret < 0 && !list_empty(&tmplist)) {
406 sums = list_entry(&tmplist, struct btrfs_ordered_sum, list);
407 list_del(&sums->list);
408 kfree(sums);
409 }
410 list_splice_tail(&tmplist, list);
411
Yan Zheng17d217f2008-12-12 10:03:38 -0500412 btrfs_free_path(path);
413 return ret;
414}
415
Chris Mason3edf7d32008-07-18 06:17:13 -0400416int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode,
Chris Masond20f7042008-12-08 16:58:54 -0500417 struct bio *bio, u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400418{
Chris Masone6dcd2d2008-07-17 12:53:50 -0400419 struct btrfs_ordered_sum *sums;
420 struct btrfs_sector_sum *sector_sum;
Chris Mason3edf7d32008-07-18 06:17:13 -0400421 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400422 char *data;
423 struct bio_vec *bvec = bio->bi_io_vec;
424 int bio_index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400425 unsigned long total_bytes = 0;
426 unsigned long this_sum_bytes = 0;
427 u64 offset;
Chris Masond20f7042008-12-08 16:58:54 -0500428 u64 disk_bytenr;
Chris Masone0156402008-04-16 11:15:20 -0400429
Chris Masone6dcd2d2008-07-17 12:53:50 -0400430 WARN_ON(bio->bi_vcnt <= 0);
431 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400432 if (!sums)
433 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400434
Chris Masoned98b562008-07-22 23:06:42 -0400435 sector_sum = sums->sums;
Chris Masond20f7042008-12-08 16:58:54 -0500436 disk_bytenr = (u64)bio->bi_sector << 9;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400437 sums->len = bio->bi_size;
438 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500439
440 if (contig)
441 offset = file_start;
442 else
443 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
444
445 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100446 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500447 sums->bytenr = ordered->start;
Chris Masone0156402008-04-16 11:15:20 -0400448
Chris Masond3977122009-01-05 21:25:51 -0500449 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500450 if (!contig)
451 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
452
Josef Bacike58dd742013-01-22 15:43:09 -0500453 if (offset >= ordered->file_offset + ordered->len ||
454 offset < ordered->file_offset) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400455 unsigned long bytes_left;
456 sums->len = this_sum_bytes;
457 this_sum_bytes = 0;
458 btrfs_add_ordered_sum(inode, ordered, sums);
459 btrfs_put_ordered_extent(ordered);
460
461 bytes_left = bio->bi_size - total_bytes;
462
463 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
464 GFP_NOFS);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100465 BUG_ON(!sums); /* -ENOMEM */
Chris Masoned98b562008-07-22 23:06:42 -0400466 sector_sum = sums->sums;
Chris Mason3edf7d32008-07-18 06:17:13 -0400467 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500468 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100469 BUG_ON(!ordered); /* Logic error */
Chris Masond20f7042008-12-08 16:58:54 -0500470 sums->bytenr = ordered->start;
Chris Mason3edf7d32008-07-18 06:17:13 -0400471 }
472
Cong Wang7ac687d2011-11-25 23:14:28 +0800473 data = kmap_atomic(bvec->bv_page);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400474 sector_sum->sum = ~(u32)0;
Liu Bob0496682013-03-14 14:57:45 +0000475 sector_sum->sum = btrfs_csum_data(data + bvec->bv_offset,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400476 sector_sum->sum,
477 bvec->bv_len);
Cong Wang7ac687d2011-11-25 23:14:28 +0800478 kunmap_atomic(data);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400479 btrfs_csum_final(sector_sum->sum,
480 (char *)&sector_sum->sum);
Chris Masond20f7042008-12-08 16:58:54 -0500481 sector_sum->bytenr = disk_bytenr;
Chris Masoned98b562008-07-22 23:06:42 -0400482
Chris Masone6dcd2d2008-07-17 12:53:50 -0400483 sector_sum++;
Chris Masone0156402008-04-16 11:15:20 -0400484 bio_index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400485 total_bytes += bvec->bv_len;
486 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500487 disk_bytenr += bvec->bv_len;
488 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400489 bvec++;
490 }
Chris Masoned98b562008-07-22 23:06:42 -0400491 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400492 btrfs_add_ordered_sum(inode, ordered, sums);
493 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400494 return 0;
495}
496
Chris Mason459931e2008-12-10 09:10:46 -0500497/*
498 * helper function for csum removal, this expects the
499 * key to describe the csum pointed to by the path, and it expects
500 * the csum to overlap the range [bytenr, len]
501 *
502 * The csum should not be entirely contained in the range and the
503 * range should not be entirely contained in the csum.
504 *
505 * This calls btrfs_truncate_item with the correct args based on the
506 * overlap, and fixes up the key as required.
507 */
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000508static noinline void truncate_one_csum(struct btrfs_root *root,
Jeff Mahoney143bede2012-03-01 14:56:26 +0100509 struct btrfs_path *path,
510 struct btrfs_key *key,
511 u64 bytenr, u64 len)
Chris Mason459931e2008-12-10 09:10:46 -0500512{
513 struct extent_buffer *leaf;
David Sterba6c417612011-04-13 15:41:04 +0200514 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500515 u64 csum_end;
516 u64 end_byte = bytenr + len;
517 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500518
519 leaf = path->nodes[0];
520 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
521 csum_end <<= root->fs_info->sb->s_blocksize_bits;
522 csum_end += key->offset;
523
524 if (key->offset < bytenr && csum_end <= end_byte) {
525 /*
526 * [ bytenr - len ]
527 * [ ]
528 * [csum ]
529 * A simple truncate off the end of the item
530 */
531 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
532 new_size *= csum_size;
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000533 btrfs_truncate_item(root, path, new_size, 1);
Chris Mason459931e2008-12-10 09:10:46 -0500534 } else if (key->offset >= bytenr && csum_end > end_byte &&
535 end_byte > key->offset) {
536 /*
537 * [ bytenr - len ]
538 * [ ]
539 * [csum ]
540 * we need to truncate from the beginning of the csum
541 */
542 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
543 new_size *= csum_size;
544
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000545 btrfs_truncate_item(root, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500546
547 key->offset = end_byte;
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000548 btrfs_set_item_key_safe(root, path, key);
Chris Mason459931e2008-12-10 09:10:46 -0500549 } else {
550 BUG();
551 }
Chris Mason459931e2008-12-10 09:10:46 -0500552}
553
554/*
555 * deletes the csum items from the csum tree for a given
556 * range of bytes.
557 */
558int btrfs_del_csums(struct btrfs_trans_handle *trans,
559 struct btrfs_root *root, u64 bytenr, u64 len)
560{
561 struct btrfs_path *path;
562 struct btrfs_key key;
563 u64 end_byte = bytenr + len;
564 u64 csum_end;
565 struct extent_buffer *leaf;
566 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200567 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500568 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
569
570 root = root->fs_info->csum_root;
571
572 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000573 if (!path)
574 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500575
Chris Masond3977122009-01-05 21:25:51 -0500576 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500577 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
578 key.offset = end_byte - 1;
579 key.type = BTRFS_EXTENT_CSUM_KEY;
580
Chris Masonb9473432009-03-13 11:00:37 -0400581 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500582 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
583 if (ret > 0) {
584 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000585 break;
Chris Mason459931e2008-12-10 09:10:46 -0500586 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000587 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000588 break;
Chris Mason459931e2008-12-10 09:10:46 -0500589 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000590
Chris Mason459931e2008-12-10 09:10:46 -0500591 leaf = path->nodes[0];
592 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
593
594 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
595 key.type != BTRFS_EXTENT_CSUM_KEY) {
596 break;
597 }
598
599 if (key.offset >= end_byte)
600 break;
601
602 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
603 csum_end <<= blocksize_bits;
604 csum_end += key.offset;
605
606 /* this csum ends before we start, we're done */
607 if (csum_end <= bytenr)
608 break;
609
610 /* delete the entire item, it is inside our range */
611 if (key.offset >= bytenr && csum_end <= end_byte) {
612 ret = btrfs_del_item(trans, root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000613 if (ret)
614 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500615 if (key.offset == bytenr)
616 break;
Chris Mason459931e2008-12-10 09:10:46 -0500617 } else if (key.offset < bytenr && csum_end > end_byte) {
618 unsigned long offset;
619 unsigned long shift_len;
620 unsigned long item_offset;
621 /*
622 * [ bytenr - len ]
623 * [csum ]
624 *
625 * Our bytes are in the middle of the csum,
626 * we need to split this item and insert a new one.
627 *
628 * But we can't drop the path because the
629 * csum could change, get removed, extended etc.
630 *
631 * The trick here is the max size of a csum item leaves
632 * enough room in the tree block for a single
633 * item header. So, we split the item in place,
634 * adding a new header pointing to the existing
635 * bytes. Then we loop around again and we have
636 * a nicely formed csum item that we can neatly
637 * truncate.
638 */
639 offset = (bytenr - key.offset) >> blocksize_bits;
640 offset *= csum_size;
641
642 shift_len = (len >> blocksize_bits) * csum_size;
643
644 item_offset = btrfs_item_ptr_offset(leaf,
645 path->slots[0]);
646
647 memset_extent_buffer(leaf, 0, item_offset + offset,
648 shift_len);
649 key.offset = bytenr;
650
651 /*
652 * btrfs_split_item returns -EAGAIN when the
653 * item changed size or key
654 */
655 ret = btrfs_split_item(trans, root, path, &key, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100656 if (ret && ret != -EAGAIN) {
657 btrfs_abort_transaction(trans, root, ret);
658 goto out;
659 }
Chris Mason459931e2008-12-10 09:10:46 -0500660
661 key.offset = end_byte - 1;
662 } else {
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000663 truncate_one_csum(root, path, &key, bytenr, len);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500664 if (key.offset < bytenr)
665 break;
Chris Mason459931e2008-12-10 09:10:46 -0500666 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200667 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500668 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000669 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500670out:
671 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000672 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500673}
674
Liu Bo2f697dc2013-02-04 13:12:18 +0000675static u64 btrfs_sector_sum_left(struct btrfs_ordered_sum *sums,
676 struct btrfs_sector_sum *sector_sum,
677 u64 total_bytes, u64 sectorsize)
678{
679 u64 tmp = sectorsize;
680 u64 next_sector = sector_sum->bytenr;
681 struct btrfs_sector_sum *next = sector_sum + 1;
682
683 while ((tmp + total_bytes) < sums->len) {
684 if (next_sector + sectorsize != next->bytenr)
685 break;
686 tmp += sectorsize;
687 next_sector = next->bytenr;
688 next++;
689 }
690 return tmp;
691}
692
Chris Mason065631f2008-02-20 12:07:25 -0500693int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500694 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400695 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400696{
Chris Masond20f7042008-12-08 16:58:54 -0500697 u64 bytenr;
Chris Masonf254e522007-03-29 15:15:27 -0400698 int ret;
699 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400700 struct btrfs_key found_key;
Chris Mason065631f2008-02-20 12:07:25 -0500701 u64 next_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400702 u64 total_bytes = 0;
Chris Mason065631f2008-02-20 12:07:25 -0500703 int found_next;
Chris Mason5caf2a02007-04-02 11:20:42 -0400704 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400705 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500706 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400707 struct extent_buffer *leaf = NULL;
Chris Mason6567e832007-04-16 09:22:45 -0400708 u64 csum_offset;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400709 struct btrfs_sector_sum *sector_sum;
Chris Masonf578d4b2007-10-25 15:42:56 -0400710 u32 nritems;
711 u32 ins_size;
David Sterba6c417612011-04-13 15:41:04 +0200712 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500713
Chris Mason5caf2a02007-04-02 11:20:42 -0400714 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700715 if (!path)
716 return -ENOMEM;
717
Chris Masoned98b562008-07-22 23:06:42 -0400718 sector_sum = sums->sums;
Chris Mason065631f2008-02-20 12:07:25 -0500719again:
720 next_offset = (u64)-1;
721 found_next = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500722 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
723 file_key.offset = sector_sum->bytenr;
724 bytenr = sector_sum->bytenr;
725 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400726
Chris Masond20f7042008-12-08 16:58:54 -0500727 item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400728 if (!IS_ERR(item)) {
729 leaf = path->nodes[0];
Chris Mason639cb582008-08-28 06:15:25 -0400730 ret = 0;
Chris Masona429e512007-04-18 16:15:28 -0400731 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400732 }
Chris Masona429e512007-04-18 16:15:28 -0400733 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400734 if (ret != -EFBIG && ret != -ENOENT)
735 goto fail_unlock;
736
Chris Masona429e512007-04-18 16:15:28 -0400737 if (ret == -EFBIG) {
738 u32 item_size;
739 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400740 leaf = path->nodes[0];
741 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500742 if ((item_size / csum_size) >=
743 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400744 /* already at max size, make a new one */
745 goto insert;
746 }
747 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400748 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400749 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400750 nritems = btrfs_header_nritems(path->nodes[0]);
751 if (path->slots[0] >= nritems - 1) {
752 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400753 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400754 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400755 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400756 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400757 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400758 }
759 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500760 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
761 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400762 found_next = 1;
763 goto insert;
764 }
765 next_offset = found_key.offset;
766 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400767 goto insert;
768 }
769
770 /*
771 * at this point, we know the tree has an item, but it isn't big
772 * enough yet to put our csum in. Grow it
773 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200774 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400775 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500776 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400777 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400778 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500779
780 if (ret > 0) {
781 if (path->slots[0] == 0)
782 goto insert;
783 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400784 }
Chris Mason459931e2008-12-10 09:10:46 -0500785
Chris Mason5f39d392007-10-15 16:14:19 -0400786 leaf = path->nodes[0];
787 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500788 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400789 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500790
Chris Masond20f7042008-12-08 16:58:54 -0500791 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
792 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500793 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400794 goto insert;
795 }
Chris Mason459931e2008-12-10 09:10:46 -0500796
Liu Bo2f697dc2013-02-04 13:12:18 +0000797 if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500798 csum_size) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000799 int extend_nr;
800 u64 tmp;
801 u32 diff;
802 u32 free_space;
Chris Mason459931e2008-12-10 09:10:46 -0500803
Liu Bo2f697dc2013-02-04 13:12:18 +0000804 if (btrfs_leaf_free_space(root, leaf) <
805 sizeof(struct btrfs_item) + csum_size * 2)
806 goto insert;
807
808 free_space = btrfs_leaf_free_space(root, leaf) -
809 sizeof(struct btrfs_item) - csum_size;
810 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
811 root->sectorsize);
812 tmp >>= root->fs_info->sb->s_blocksize_bits;
813 WARN_ON(tmp < 1);
814
815 extend_nr = max_t(int, 1, (int)tmp);
816 diff = (csum_offset + extend_nr) * csum_size;
817 diff = min(diff, MAX_CSUM_ITEMS(root, csum_size) * csum_size);
Chris Mason459931e2008-12-10 09:10:46 -0500818
Chris Mason5f39d392007-10-15 16:14:19 -0400819 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Liu Bo2f697dc2013-02-04 13:12:18 +0000820 diff = min(free_space, diff);
821 diff /= csum_size;
822 diff *= csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500823
Tsutomu Itoh4b90c682013-04-16 05:18:49 +0000824 btrfs_extend_item(root, path, diff);
Chris Mason6567e832007-04-16 09:22:45 -0400825 goto csum;
826 }
827
828insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200829 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400830 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400831 if (found_next) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000832 u64 tmp;
Chris Masond20f7042008-12-08 16:58:54 -0500833
Liu Bo2f697dc2013-02-04 13:12:18 +0000834 tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes,
835 root->sectorsize);
Chris Masonf578d4b2007-10-25 15:42:56 -0400836 tmp >>= root->fs_info->sb->s_blocksize_bits;
Liu Bo2f697dc2013-02-04 13:12:18 +0000837 tmp = min(tmp, (next_offset - file_key.offset) >>
838 root->fs_info->sb->s_blocksize_bits);
839
Chris Masonf578d4b2007-10-25 15:42:56 -0400840 tmp = max((u64)1, tmp);
Josef Bacik607d4322008-12-02 07:17:45 -0500841 tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size));
842 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400843 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500844 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400845 }
Chris Masonb9473432009-03-13 11:00:37 -0400846 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400847 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400848 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400849 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400850 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400851 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400852 if (ret != 0) {
Chris Masona429e512007-04-18 16:15:28 -0400853 WARN_ON(1);
Chris Mason53863232008-08-15 15:34:18 -0400854 goto fail_unlock;
Chris Masona429e512007-04-18 16:15:28 -0400855 }
Chris Mason6567e832007-04-16 09:22:45 -0400856csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400857 leaf = path->nodes[0];
858 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Masonf254e522007-03-29 15:15:27 -0400859 ret = 0;
Chris Mason509659c2007-05-10 12:36:17 -0400860 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500861 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400862found:
Chris Mason065631f2008-02-20 12:07:25 -0500863 item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
864 item_end = (struct btrfs_csum_item *)((unsigned char *)item_end +
865 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masone6dcd2d2008-07-17 12:53:50 -0400866next_sector:
Chris Masonaadfeb62008-01-29 09:10:27 -0500867
Chris Masona6591712011-07-19 12:04:14 -0400868 write_extent_buffer(leaf, &sector_sum->sum, (unsigned long)item, csum_size);
Chris Mason7f3c74f2008-07-18 12:01:11 -0400869
Chris Masone6dcd2d2008-07-17 12:53:50 -0400870 total_bytes += root->sectorsize;
871 sector_sum++;
872 if (total_bytes < sums->len) {
Chris Mason6e92f5e2008-02-20 12:07:25 -0500873 item = (struct btrfs_csum_item *)((char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500874 csum_size);
Chris Masond20f7042008-12-08 16:58:54 -0500875 if (item < item_end && bytenr + PAGE_CACHE_SIZE ==
876 sector_sum->bytenr) {
877 bytenr = sector_sum->bytenr;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400878 goto next_sector;
Chris Mason2e1a9922008-02-20 15:44:32 -0500879 }
Chris Mason065631f2008-02-20 12:07:25 -0500880 }
Chris Masona6591712011-07-19 12:04:14 -0400881
Chris Mason5caf2a02007-04-02 11:20:42 -0400882 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400883 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200884 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400885 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500886 goto again;
887 }
Chris Mason53863232008-08-15 15:34:18 -0400888out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400889 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400890 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400891
892fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400893 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400894}