blob: 6f384886028386f2f069756ef18e757b10ba9dbf [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"
Miao Xiefacc8a222013-07-25 19:22:34 +080026#include "volumes.h"
Chris Mason1de037a2007-05-29 15:17:08 -040027#include "print-tree.h"
Chris Mason1e1d2702007-03-15 19:03:33 -040028
Jan Schmidt995e01b2012-08-13 02:52:38 -060029#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
Josef Bacik607d4322008-12-02 07:17:45 -050030 sizeof(struct btrfs_item) * 2) / \
31 size) - 1))
Yan Zheng07d400a2009-01-06 11:42:00 -050032
Zach Brown221b8312012-09-20 14:33:00 -060033#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
34 PAGE_CACHE_SIZE))
Chris Mason7ca4be42012-01-31 20:19:02 -050035
Yan Zheng07d400a2009-01-06 11:42:00 -050036#define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \
37 sizeof(struct btrfs_ordered_sum)) / \
Miao Xief51a4a12013-06-19 10:36:09 +080038 sizeof(u32) * (r)->sectorsize)
Yan Zheng07d400a2009-01-06 11:42:00 -050039
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
Miao Xiefacc8a222013-07-25 19:22:34 +0800156static void btrfs_io_bio_endio_readpage(struct btrfs_io_bio *bio, int err)
157{
158 kfree(bio->csum_allocated);
159}
160
Josef Bacik4b46fce2010-05-23 11:00:55 -0400161static int __btrfs_lookup_bio_sums(struct btrfs_root *root,
162 struct inode *inode, struct bio *bio,
163 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400164{
Chris Mason61b49442008-07-31 15:42:53 -0400165 struct bio_vec *bvec = bio->bi_io_vec;
Miao Xiefacc8a222013-07-25 19:22:34 +0800166 struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
167 struct btrfs_csum_item *item = NULL;
168 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
169 struct btrfs_path *path;
170 u8 *csum;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400171 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400172 u64 item_start_offset = 0;
173 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500174 u64 disk_bytenr;
Chris Mason61b49442008-07-31 15:42:53 -0400175 u32 diff;
Miao Xiefacc8a222013-07-25 19:22:34 +0800176 int nblocks;
177 int bio_index = 0;
Miao Xiee4100d92013-04-05 07:20:56 +0000178 int count;
Miao Xiefacc8a222013-07-25 19:22:34 +0800179 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason61b49442008-07-31 15:42:53 -0400180
181 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000182 if (!path)
183 return -ENOMEM;
Miao Xiefacc8a222013-07-25 19:22:34 +0800184
185 nblocks = bio->bi_size >> inode->i_sb->s_blocksize_bits;
186 if (!dst) {
187 if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) {
188 btrfs_bio->csum_allocated = kmalloc(nblocks * csum_size,
189 GFP_NOFS);
190 if (!btrfs_bio->csum_allocated) {
191 btrfs_free_path(path);
192 return -ENOMEM;
193 }
194 btrfs_bio->csum = btrfs_bio->csum_allocated;
195 btrfs_bio->end_io = btrfs_io_bio_endio_readpage;
196 } else {
197 btrfs_bio->csum = btrfs_bio->csum_inline;
198 }
199 csum = btrfs_bio->csum;
200 } else {
201 csum = (u8 *)dst;
202 }
203
Chris Mason4d1b5fb2008-08-20 09:44:52 -0400204 if (bio->bi_size > PAGE_CACHE_SIZE * 8)
205 path->reada = 2;
Chris Mason61b49442008-07-31 15:42:53 -0400206
207 WARN_ON(bio->bi_vcnt <= 0);
208
Chris Mason2cf85722011-07-26 15:35:09 -0400209 /*
210 * the free space stuff is only read when it hasn't been
211 * updated in the current transaction. So, we can safely
212 * read from the commit root and sidestep a nasty deadlock
213 * between reading the free space cache and updating the csum tree.
214 */
Liu Bo83eea1f2012-07-10 05:28:39 -0600215 if (btrfs_is_free_space_inode(inode)) {
Chris Mason2cf85722011-07-26 15:35:09 -0400216 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400217 path->skip_locking = 1;
218 }
Chris Mason2cf85722011-07-26 15:35:09 -0400219
Chris Masond20f7042008-12-08 16:58:54 -0500220 disk_bytenr = (u64)bio->bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400221 if (dio)
222 offset = logical_offset;
Chris Masond3977122009-01-05 21:25:51 -0500223 while (bio_index < bio->bi_vcnt) {
Josef Bacik4b46fce2010-05-23 11:00:55 -0400224 if (!dio)
225 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
Miao Xiefacc8a222013-07-25 19:22:34 +0800226 count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
227 (u32 *)csum, nblocks);
Miao Xiee4100d92013-04-05 07:20:56 +0000228 if (count)
Chris Mason61b49442008-07-31 15:42:53 -0400229 goto found;
230
Chris Masond20f7042008-12-08 16:58:54 -0500231 if (!item || disk_bytenr < item_start_offset ||
232 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400233 struct btrfs_key found_key;
234 u32 item_size;
235
236 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200237 btrfs_release_path(path);
Chris Masond20f7042008-12-08 16:58:54 -0500238 item = btrfs_lookup_csum(NULL, root->fs_info->csum_root,
239 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400240 if (IS_ERR(item)) {
Miao Xiee4100d92013-04-05 07:20:56 +0000241 count = 1;
Miao Xiefacc8a222013-07-25 19:22:34 +0800242 memset(csum, 0, csum_size);
Yan Zheng17d217f2008-12-12 10:03:38 -0500243 if (BTRFS_I(inode)->root->root_key.objectid ==
244 BTRFS_DATA_RELOC_TREE_OBJECTID) {
245 set_extent_bits(io_tree, offset,
246 offset + bvec->bv_len - 1,
247 EXTENT_NODATASUM, GFP_NOFS);
248 } else {
Chris Masond3977122009-01-05 21:25:51 -0500249 printk(KERN_INFO "btrfs no csum found "
Li Zefan33345d012011-04-20 10:31:50 +0800250 "for inode %llu start %llu\n",
Geert Uytterhoevenc1c9ff72013-08-20 13:20:07 +0200251 btrfs_ino(inode), offset);
Yan Zheng17d217f2008-12-12 10:03:38 -0500252 }
Chris Mason6dab8152008-08-04 08:35:53 -0400253 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200254 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400255 goto found;
256 }
257 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
258 path->slots[0]);
259
260 item_start_offset = found_key.offset;
261 item_size = btrfs_item_size_nr(path->nodes[0],
262 path->slots[0]);
263 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500264 (item_size / csum_size) *
Chris Mason61b49442008-07-31 15:42:53 -0400265 root->sectorsize;
266 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
267 struct btrfs_csum_item);
268 }
269 /*
270 * this byte range must be able to fit inside
271 * a single leaf so it will also fit inside a u32
272 */
Chris Masond20f7042008-12-08 16:58:54 -0500273 diff = disk_bytenr - item_start_offset;
Chris Mason61b49442008-07-31 15:42:53 -0400274 diff = diff / root->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500275 diff = diff * csum_size;
Miao Xiefacc8a222013-07-25 19:22:34 +0800276 count = min_t(int, nblocks, (item_last_offset - disk_bytenr) >>
277 inode->i_sb->s_blocksize_bits);
278 read_extent_buffer(path->nodes[0], csum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400279 ((unsigned long)item) + diff,
Miao Xiee4100d92013-04-05 07:20:56 +0000280 csum_size * count);
Chris Mason61b49442008-07-31 15:42:53 -0400281found:
Miao Xiefacc8a222013-07-25 19:22:34 +0800282 csum += count * csum_size;
283 nblocks -= count;
Miao Xiee4100d92013-04-05 07:20:56 +0000284 while (count--) {
285 disk_bytenr += bvec->bv_len;
286 offset += bvec->bv_len;
287 bio_index++;
288 bvec++;
289 }
Chris Mason61b49442008-07-31 15:42:53 -0400290 }
291 btrfs_free_path(path);
292 return 0;
293}
294
Josef Bacik4b46fce2010-05-23 11:00:55 -0400295int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode,
296 struct bio *bio, u32 *dst)
297{
298 return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0);
299}
300
301int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode,
Miao Xiefacc8a222013-07-25 19:22:34 +0800302 struct btrfs_dio_private *dip, struct bio *bio,
303 u64 offset)
Josef Bacik4b46fce2010-05-23 11:00:55 -0400304{
Miao Xiefacc8a222013-07-25 19:22:34 +0800305 int len = (bio->bi_sector << 9) - dip->disk_bytenr;
306 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
307 int ret;
308
309 len >>= inode->i_sb->s_blocksize_bits;
310 len *= csum_size;
311
312 ret = __btrfs_lookup_bio_sums(root, inode, bio, offset,
313 (u32 *)(dip->csum + len), 1);
314 return ret;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400315}
316
Yan Zheng17d217f2008-12-12 10:03:38 -0500317int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100318 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500319{
320 struct btrfs_key key;
321 struct btrfs_path *path;
322 struct extent_buffer *leaf;
323 struct btrfs_ordered_sum *sums;
Yan Zheng17d217f2008-12-12 10:03:38 -0500324 struct btrfs_csum_item *item;
Mark Fasheh0678b612011-08-05 15:46:16 -0700325 LIST_HEAD(tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500326 unsigned long offset;
327 int ret;
328 size_t size;
329 u64 csum_end;
David Sterba6c417612011-04-13 15:41:04 +0200330 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500331
Josef Bacik4277a9c2013-10-15 09:36:40 -0400332 ASSERT(start == ALIGN(start, root->sectorsize) &&
333 (end + 1) == ALIGN(end + 1, root->sectorsize));
334
Yan Zheng17d217f2008-12-12 10:03:38 -0500335 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700336 if (!path)
337 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500338
Arne Jansena2de7332011-03-08 14:14:00 +0100339 if (search_commit) {
340 path->skip_locking = 1;
341 path->reada = 2;
342 path->search_commit_root = 1;
343 }
344
Yan Zheng17d217f2008-12-12 10:03:38 -0500345 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
346 key.offset = start;
347 key.type = BTRFS_EXTENT_CSUM_KEY;
348
Yan Zheng07d400a2009-01-06 11:42:00 -0500349 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500350 if (ret < 0)
351 goto fail;
352 if (ret > 0 && path->slots[0] > 0) {
353 leaf = path->nodes[0];
354 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
355 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
356 key.type == BTRFS_EXTENT_CSUM_KEY) {
357 offset = (start - key.offset) >>
358 root->fs_info->sb->s_blocksize_bits;
359 if (offset * csum_size <
360 btrfs_item_size_nr(leaf, path->slots[0] - 1))
361 path->slots[0]--;
362 }
363 }
364
365 while (start <= end) {
366 leaf = path->nodes[0];
367 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500368 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500369 if (ret < 0)
370 goto fail;
371 if (ret > 0)
372 break;
373 leaf = path->nodes[0];
374 }
375
376 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
377 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Zhi Yong Wu628c8282013-03-18 09:18:09 +0000378 key.type != BTRFS_EXTENT_CSUM_KEY ||
379 key.offset > end)
Yan Zheng17d217f2008-12-12 10:03:38 -0500380 break;
381
382 if (key.offset > start)
383 start = key.offset;
384
385 size = btrfs_item_size_nr(leaf, path->slots[0]);
386 csum_end = key.offset + (size / csum_size) * root->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500387 if (csum_end <= start) {
388 path->slots[0]++;
389 continue;
390 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500391
Yan Zheng07d400a2009-01-06 11:42:00 -0500392 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500393 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
394 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500395 while (start < csum_end) {
396 size = min_t(size_t, csum_end - start,
Miao Xief51a4a12013-06-19 10:36:09 +0800397 MAX_ORDERED_SUM_BYTES(root));
Yan Zheng07d400a2009-01-06 11:42:00 -0500398 sums = kzalloc(btrfs_ordered_sum_size(root, size),
Miao Xief51a4a12013-06-19 10:36:09 +0800399 GFP_NOFS);
Mark Fasheh0678b612011-08-05 15:46:16 -0700400 if (!sums) {
401 ret = -ENOMEM;
402 goto fail;
403 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500404
Yan Zheng07d400a2009-01-06 11:42:00 -0500405 sums->bytenr = start;
Miao Xief51a4a12013-06-19 10:36:09 +0800406 sums->len = (int)size;
Yan Zheng07d400a2009-01-06 11:42:00 -0500407
408 offset = (start - key.offset) >>
409 root->fs_info->sb->s_blocksize_bits;
410 offset *= csum_size;
Miao Xief51a4a12013-06-19 10:36:09 +0800411 size >>= root->fs_info->sb->s_blocksize_bits;
Yan Zheng07d400a2009-01-06 11:42:00 -0500412
Miao Xief51a4a12013-06-19 10:36:09 +0800413 read_extent_buffer(path->nodes[0],
414 sums->sums,
415 ((unsigned long)item) + offset,
416 csum_size * size);
Yan Zheng07d400a2009-01-06 11:42:00 -0500417
Miao Xief51a4a12013-06-19 10:36:09 +0800418 start += root->sectorsize * size;
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;
Chris Mason3edf7d32008-07-18 06:17:13 -0400440 struct btrfs_ordered_extent *ordered;
Chris Masone0156402008-04-16 11:15:20 -0400441 char *data;
442 struct bio_vec *bvec = bio->bi_io_vec;
443 int bio_index = 0;
Miao Xief51a4a12013-06-19 10:36:09 +0800444 int index;
Chris Mason3edf7d32008-07-18 06:17:13 -0400445 unsigned long total_bytes = 0;
446 unsigned long this_sum_bytes = 0;
447 u64 offset;
Chris Masone0156402008-04-16 11:15:20 -0400448
Chris Masone6dcd2d2008-07-17 12:53:50 -0400449 WARN_ON(bio->bi_vcnt <= 0);
450 sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400451 if (!sums)
452 return -ENOMEM;
Chris Mason3edf7d32008-07-18 06:17:13 -0400453
Chris Masone6dcd2d2008-07-17 12:53:50 -0400454 sums->len = bio->bi_size;
455 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500456
457 if (contig)
458 offset = file_start;
459 else
460 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
461
462 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100463 BUG_ON(!ordered); /* Logic error */
Miao Xief51a4a12013-06-19 10:36:09 +0800464 sums->bytenr = (u64)bio->bi_sector << 9;
465 index = 0;
Chris Masone0156402008-04-16 11:15:20 -0400466
Chris Masond3977122009-01-05 21:25:51 -0500467 while (bio_index < bio->bi_vcnt) {
Chris Masond20f7042008-12-08 16:58:54 -0500468 if (!contig)
469 offset = page_offset(bvec->bv_page) + bvec->bv_offset;
470
Josef Bacike58dd742013-01-22 15:43:09 -0500471 if (offset >= ordered->file_offset + ordered->len ||
472 offset < ordered->file_offset) {
Chris Mason3edf7d32008-07-18 06:17:13 -0400473 unsigned long bytes_left;
474 sums->len = this_sum_bytes;
475 this_sum_bytes = 0;
476 btrfs_add_ordered_sum(inode, ordered, sums);
477 btrfs_put_ordered_extent(ordered);
478
479 bytes_left = bio->bi_size - total_bytes;
480
481 sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left),
482 GFP_NOFS);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100483 BUG_ON(!sums); /* -ENOMEM */
Chris Mason3edf7d32008-07-18 06:17:13 -0400484 sums->len = bytes_left;
Chris Masond20f7042008-12-08 16:58:54 -0500485 ordered = btrfs_lookup_ordered_extent(inode, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100486 BUG_ON(!ordered); /* Logic error */
Miao Xief51a4a12013-06-19 10:36:09 +0800487 sums->bytenr = ((u64)bio->bi_sector << 9) +
488 total_bytes;
489 index = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400490 }
491
Cong Wang7ac687d2011-11-25 23:14:28 +0800492 data = kmap_atomic(bvec->bv_page);
Miao Xief51a4a12013-06-19 10:36:09 +0800493 sums->sums[index] = ~(u32)0;
494 sums->sums[index] = btrfs_csum_data(data + bvec->bv_offset,
495 sums->sums[index],
496 bvec->bv_len);
Cong Wang7ac687d2011-11-25 23:14:28 +0800497 kunmap_atomic(data);
Miao Xief51a4a12013-06-19 10:36:09 +0800498 btrfs_csum_final(sums->sums[index],
499 (char *)(sums->sums + index));
Chris Masoned98b562008-07-22 23:06:42 -0400500
Chris Masone0156402008-04-16 11:15:20 -0400501 bio_index++;
Miao Xief51a4a12013-06-19 10:36:09 +0800502 index++;
Chris Mason3edf7d32008-07-18 06:17:13 -0400503 total_bytes += bvec->bv_len;
504 this_sum_bytes += bvec->bv_len;
Chris Masond20f7042008-12-08 16:58:54 -0500505 offset += bvec->bv_len;
Chris Masone0156402008-04-16 11:15:20 -0400506 bvec++;
507 }
Chris Masoned98b562008-07-22 23:06:42 -0400508 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400509 btrfs_add_ordered_sum(inode, ordered, sums);
510 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400511 return 0;
512}
513
Chris Mason459931e2008-12-10 09:10:46 -0500514/*
515 * helper function for csum removal, this expects the
516 * key to describe the csum pointed to by the path, and it expects
517 * the csum to overlap the range [bytenr, len]
518 *
519 * The csum should not be entirely contained in the range and the
520 * range should not be entirely contained in the csum.
521 *
522 * This calls btrfs_truncate_item with the correct args based on the
523 * overlap, and fixes up the key as required.
524 */
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000525static noinline void truncate_one_csum(struct btrfs_root *root,
Jeff Mahoney143bede2012-03-01 14:56:26 +0100526 struct btrfs_path *path,
527 struct btrfs_key *key,
528 u64 bytenr, u64 len)
Chris Mason459931e2008-12-10 09:10:46 -0500529{
530 struct extent_buffer *leaf;
David Sterba6c417612011-04-13 15:41:04 +0200531 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500532 u64 csum_end;
533 u64 end_byte = bytenr + len;
534 u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500535
536 leaf = path->nodes[0];
537 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
538 csum_end <<= root->fs_info->sb->s_blocksize_bits;
539 csum_end += key->offset;
540
541 if (key->offset < bytenr && csum_end <= end_byte) {
542 /*
543 * [ bytenr - len ]
544 * [ ]
545 * [csum ]
546 * A simple truncate off the end of the item
547 */
548 u32 new_size = (bytenr - key->offset) >> blocksize_bits;
549 new_size *= csum_size;
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000550 btrfs_truncate_item(root, path, new_size, 1);
Chris Mason459931e2008-12-10 09:10:46 -0500551 } else if (key->offset >= bytenr && csum_end > end_byte &&
552 end_byte > key->offset) {
553 /*
554 * [ bytenr - len ]
555 * [ ]
556 * [csum ]
557 * we need to truncate from the beginning of the csum
558 */
559 u32 new_size = (csum_end - end_byte) >> blocksize_bits;
560 new_size *= csum_size;
561
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000562 btrfs_truncate_item(root, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500563
564 key->offset = end_byte;
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000565 btrfs_set_item_key_safe(root, path, key);
Chris Mason459931e2008-12-10 09:10:46 -0500566 } else {
567 BUG();
568 }
Chris Mason459931e2008-12-10 09:10:46 -0500569}
570
571/*
572 * deletes the csum items from the csum tree for a given
573 * range of bytes.
574 */
575int btrfs_del_csums(struct btrfs_trans_handle *trans,
576 struct btrfs_root *root, u64 bytenr, u64 len)
577{
578 struct btrfs_path *path;
579 struct btrfs_key key;
580 u64 end_byte = bytenr + len;
581 u64 csum_end;
582 struct extent_buffer *leaf;
583 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200584 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500585 int blocksize_bits = root->fs_info->sb->s_blocksize_bits;
586
587 root = root->fs_info->csum_root;
588
589 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000590 if (!path)
591 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500592
Chris Masond3977122009-01-05 21:25:51 -0500593 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500594 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
595 key.offset = end_byte - 1;
596 key.type = BTRFS_EXTENT_CSUM_KEY;
597
Chris Masonb9473432009-03-13 11:00:37 -0400598 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500599 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
600 if (ret > 0) {
601 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000602 break;
Chris Mason459931e2008-12-10 09:10:46 -0500603 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000604 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000605 break;
Chris Mason459931e2008-12-10 09:10:46 -0500606 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000607
Chris Mason459931e2008-12-10 09:10:46 -0500608 leaf = path->nodes[0];
609 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
610
611 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
612 key.type != BTRFS_EXTENT_CSUM_KEY) {
613 break;
614 }
615
616 if (key.offset >= end_byte)
617 break;
618
619 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
620 csum_end <<= blocksize_bits;
621 csum_end += key.offset;
622
623 /* this csum ends before we start, we're done */
624 if (csum_end <= bytenr)
625 break;
626
627 /* delete the entire item, it is inside our range */
628 if (key.offset >= bytenr && csum_end <= end_byte) {
629 ret = btrfs_del_item(trans, root, path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000630 if (ret)
631 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500632 if (key.offset == bytenr)
633 break;
Chris Mason459931e2008-12-10 09:10:46 -0500634 } else if (key.offset < bytenr && csum_end > end_byte) {
635 unsigned long offset;
636 unsigned long shift_len;
637 unsigned long item_offset;
638 /*
639 * [ bytenr - len ]
640 * [csum ]
641 *
642 * Our bytes are in the middle of the csum,
643 * we need to split this item and insert a new one.
644 *
645 * But we can't drop the path because the
646 * csum could change, get removed, extended etc.
647 *
648 * The trick here is the max size of a csum item leaves
649 * enough room in the tree block for a single
650 * item header. So, we split the item in place,
651 * adding a new header pointing to the existing
652 * bytes. Then we loop around again and we have
653 * a nicely formed csum item that we can neatly
654 * truncate.
655 */
656 offset = (bytenr - key.offset) >> blocksize_bits;
657 offset *= csum_size;
658
659 shift_len = (len >> blocksize_bits) * csum_size;
660
661 item_offset = btrfs_item_ptr_offset(leaf,
662 path->slots[0]);
663
664 memset_extent_buffer(leaf, 0, item_offset + offset,
665 shift_len);
666 key.offset = bytenr;
667
668 /*
669 * btrfs_split_item returns -EAGAIN when the
670 * item changed size or key
671 */
672 ret = btrfs_split_item(trans, root, path, &key, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100673 if (ret && ret != -EAGAIN) {
674 btrfs_abort_transaction(trans, root, ret);
675 goto out;
676 }
Chris Mason459931e2008-12-10 09:10:46 -0500677
678 key.offset = end_byte - 1;
679 } else {
Tsutomu Itohafe5fea2013-04-16 05:18:22 +0000680 truncate_one_csum(root, path, &key, bytenr, len);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500681 if (key.offset < bytenr)
682 break;
Chris Mason459931e2008-12-10 09:10:46 -0500683 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200684 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500685 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000686 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500687out:
688 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000689 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500690}
691
Chris Mason065631f2008-02-20 12:07:25 -0500692int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500693 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400694 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400695{
Chris Masonf254e522007-03-29 15:15:27 -0400696 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400697 struct btrfs_key found_key;
Chris Mason5caf2a02007-04-02 11:20:42 -0400698 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400699 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500700 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400701 struct extent_buffer *leaf = NULL;
Miao Xief51a4a12013-06-19 10:36:09 +0800702 u64 next_offset;
703 u64 total_bytes = 0;
Chris Mason6567e832007-04-16 09:22:45 -0400704 u64 csum_offset;
Miao Xief51a4a12013-06-19 10:36:09 +0800705 u64 bytenr;
Chris Masonf578d4b2007-10-25 15:42:56 -0400706 u32 nritems;
707 u32 ins_size;
Miao Xief51a4a12013-06-19 10:36:09 +0800708 int index = 0;
709 int found_next;
710 int ret;
David Sterba6c417612011-04-13 15:41:04 +0200711 u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500712
Chris Mason5caf2a02007-04-02 11:20:42 -0400713 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700714 if (!path)
715 return -ENOMEM;
Chris Mason065631f2008-02-20 12:07:25 -0500716again:
717 next_offset = (u64)-1;
718 found_next = 0;
Miao Xief51a4a12013-06-19 10:36:09 +0800719 bytenr = sums->bytenr + total_bytes;
Chris Masond20f7042008-12-08 16:58:54 -0500720 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
Miao Xief51a4a12013-06-19 10:36:09 +0800721 file_key.offset = bytenr;
Chris Masond20f7042008-12-08 16:58:54 -0500722 btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY);
Chris Masona429e512007-04-18 16:15:28 -0400723
Miao Xief51a4a12013-06-19 10:36:09 +0800724 item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400725 if (!IS_ERR(item)) {
Chris Mason639cb582008-08-28 06:15:25 -0400726 ret = 0;
Miao Xief51a4a12013-06-19 10:36:09 +0800727 leaf = path->nodes[0];
728 item_end = btrfs_item_ptr(leaf, path->slots[0],
729 struct btrfs_csum_item);
730 item_end = (struct btrfs_csum_item *)((char *)item_end +
731 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masona429e512007-04-18 16:15:28 -0400732 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400733 }
Chris Masona429e512007-04-18 16:15:28 -0400734 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400735 if (ret != -EFBIG && ret != -ENOENT)
736 goto fail_unlock;
737
Chris Masona429e512007-04-18 16:15:28 -0400738 if (ret == -EFBIG) {
739 u32 item_size;
740 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400741 leaf = path->nodes[0];
742 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500743 if ((item_size / csum_size) >=
744 MAX_CSUM_ITEMS(root, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400745 /* already at max size, make a new one */
746 goto insert;
747 }
748 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400749 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400750 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400751 nritems = btrfs_header_nritems(path->nodes[0]);
752 if (path->slots[0] >= nritems - 1) {
753 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400754 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400755 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400756 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400757 goto insert;
Yanb56baf52007-10-29 12:01:05 -0400758 slot = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400759 }
760 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500761 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
762 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400763 found_next = 1;
764 goto insert;
765 }
766 next_offset = found_key.offset;
767 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400768 goto insert;
769 }
770
771 /*
772 * at this point, we know the tree has an item, but it isn't big
773 * enough yet to put our csum in. Grow it
774 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200775 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400776 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500777 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400778 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400779 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500780
781 if (ret > 0) {
782 if (path->slots[0] == 0)
783 goto insert;
784 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400785 }
Chris Mason459931e2008-12-10 09:10:46 -0500786
Chris Mason5f39d392007-10-15 16:14:19 -0400787 leaf = path->nodes[0];
788 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500789 csum_offset = (bytenr - found_key.offset) >>
Chris Mason6567e832007-04-16 09:22:45 -0400790 root->fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500791
Chris Masond20f7042008-12-08 16:58:54 -0500792 if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY ||
793 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Josef Bacik607d4322008-12-02 07:17:45 -0500794 csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400795 goto insert;
796 }
Chris Mason459931e2008-12-10 09:10:46 -0500797
Liu Bo2f697dc2013-02-04 13:12:18 +0000798 if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500799 csum_size) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000800 int extend_nr;
801 u64 tmp;
802 u32 diff;
803 u32 free_space;
Chris Mason459931e2008-12-10 09:10:46 -0500804
Liu Bo2f697dc2013-02-04 13:12:18 +0000805 if (btrfs_leaf_free_space(root, leaf) <
806 sizeof(struct btrfs_item) + csum_size * 2)
807 goto insert;
808
809 free_space = btrfs_leaf_free_space(root, leaf) -
810 sizeof(struct btrfs_item) - csum_size;
Miao Xief51a4a12013-06-19 10:36:09 +0800811 tmp = sums->len - total_bytes;
Liu Bo2f697dc2013-02-04 13:12:18 +0000812 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);
Miao Xief51a4a12013-06-19 10:36:09 +0800825 ret = 0;
Chris Mason6567e832007-04-16 09:22:45 -0400826 goto csum;
827 }
828
829insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200830 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400831 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400832 if (found_next) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000833 u64 tmp;
Chris Masond20f7042008-12-08 16:58:54 -0500834
Miao Xief51a4a12013-06-19 10:36:09 +0800835 tmp = sums->len - total_bytes;
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;
Dulshani Gunawardhanafae7f212013-10-31 10:30:08 +0530852 if (WARN_ON(ret != 0))
Chris Mason53863232008-08-15 15:34:18 -0400853 goto fail_unlock;
Chris Mason5f39d392007-10-15 16:14:19 -0400854 leaf = path->nodes[0];
Miao Xief51a4a12013-06-19 10:36:09 +0800855csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400856 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Miao Xief51a4a12013-06-19 10:36:09 +0800857 item_end = (struct btrfs_csum_item *)((unsigned char *)item +
858 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Mason509659c2007-05-10 12:36:17 -0400859 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500860 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400861found:
Miao Xief51a4a12013-06-19 10:36:09 +0800862 ins_size = (u32)(sums->len - total_bytes) >>
863 root->fs_info->sb->s_blocksize_bits;
864 ins_size *= csum_size;
865 ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item,
866 ins_size);
867 write_extent_buffer(leaf, sums->sums + index, (unsigned long)item,
868 ins_size);
Chris Masonaadfeb62008-01-29 09:10:27 -0500869
Miao Xief51a4a12013-06-19 10:36:09 +0800870 ins_size /= csum_size;
871 total_bytes += ins_size * root->sectorsize;
872 index += ins_size;
Chris Masona6591712011-07-19 12:04:14 -0400873
Chris Mason5caf2a02007-04-02 11:20:42 -0400874 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400875 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200876 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400877 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500878 goto again;
879 }
Chris Mason53863232008-08-15 15:34:18 -0400880out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400881 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400882 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400883
884fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400885 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400886}