blob: f9dd6d1836a3b6b343cca48cea5e294a0a4c1416 [file] [log] [blame]
David Sterbac1d7c512018-04-03 19:23:33 +02001// SPDX-License-Identifier: GPL-2.0
Chris Mason6cbd5572007-06-12 09:07:21 -04002/*
3 * Copyright (C) 2007 Oracle. All rights reserved.
Chris Mason6cbd5572007-06-12 09:07:21 -04004 */
5
Chris Mason065631f2008-02-20 12:07:25 -05006#include <linux/bio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +09007#include <linux/slab.h>
Chris Mason065631f2008-02-20 12:07:25 -05008#include <linux/pagemap.h>
9#include <linux/highmem.h>
Chris Mason1e1d2702007-03-15 19:03:33 -040010#include "ctree.h"
Chris Masondee26a92007-03-26 16:00:06 -040011#include "disk-io.h"
Chris Mason9f5fae22007-03-20 14:38:32 -040012#include "transaction.h"
Miao Xiefacc8a222013-07-25 19:22:34 +080013#include "volumes.h"
Chris Mason1de037a2007-05-29 15:17:08 -040014#include "print-tree.h"
Anand Jainebb87652016-03-10 17:26:59 +080015#include "compression.h"
Chris Mason1e1d2702007-03-15 19:03:33 -040016
Chris Mason42049bf2016-08-03 14:05:46 -070017#define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \
18 sizeof(struct btrfs_item) * 2) / \
19 size) - 1))
Yan Zheng07d400a2009-01-06 11:42:00 -050020
Zach Brown221b8312012-09-20 14:33:00 -060021#define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +030022 PAGE_SIZE))
Chris Mason7ca4be42012-01-31 20:19:02 -050023
Jeff Mahoneyda170662016-06-15 09:22:56 -040024#define MAX_ORDERED_SUM_BYTES(fs_info) ((PAGE_SIZE - \
Yan Zheng07d400a2009-01-06 11:42:00 -050025 sizeof(struct btrfs_ordered_sum)) / \
Jeff Mahoneyda170662016-06-15 09:22:56 -040026 sizeof(u32) * (fs_info)->sectorsize)
Yan Zheng07d400a2009-01-06 11:42:00 -050027
Chris Masonb18c6682007-04-17 13:26:50 -040028int btrfs_insert_file_extent(struct btrfs_trans_handle *trans,
Sage Weilf2eb0a22008-05-02 14:43:14 -040029 struct btrfs_root *root,
30 u64 objectid, u64 pos,
31 u64 disk_offset, u64 disk_num_bytes,
Chris Masonc8b97812008-10-29 14:49:59 -040032 u64 num_bytes, u64 offset, u64 ram_bytes,
33 u8 compression, u8 encryption, u16 other_encoding)
Chris Mason9f5fae22007-03-20 14:38:32 -040034{
Chris Masondee26a92007-03-26 16:00:06 -040035 int ret = 0;
36 struct btrfs_file_extent_item *item;
37 struct btrfs_key file_key;
Chris Mason5caf2a02007-04-02 11:20:42 -040038 struct btrfs_path *path;
Chris Mason5f39d392007-10-15 16:14:19 -040039 struct extent_buffer *leaf;
Chris Masondee26a92007-03-26 16:00:06 -040040
Chris Mason5caf2a02007-04-02 11:20:42 -040041 path = btrfs_alloc_path();
Tsutomu Itohdb5b4932011-03-23 08:14:16 +000042 if (!path)
43 return -ENOMEM;
Chris Masondee26a92007-03-26 16:00:06 -040044 file_key.objectid = objectid;
Chris Masonb18c6682007-04-17 13:26:50 -040045 file_key.offset = pos;
David Sterba962a2982014-06-04 18:41:45 +020046 file_key.type = BTRFS_EXTENT_DATA_KEY;
Chris Masondee26a92007-03-26 16:00:06 -040047
Chris Masonb9473432009-03-13 11:00:37 -040048 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -040049 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masondee26a92007-03-26 16:00:06 -040050 sizeof(*item));
Chris Mason54aa1f42007-06-22 14:16:25 -040051 if (ret < 0)
52 goto out;
Jeff Mahoney79787ea2012-03-12 16:03:00 +010053 BUG_ON(ret); /* Can't happen */
Chris Mason5f39d392007-10-15 16:14:19 -040054 leaf = path->nodes[0];
55 item = btrfs_item_ptr(leaf, path->slots[0],
Chris Masondee26a92007-03-26 16:00:06 -040056 struct btrfs_file_extent_item);
Sage Weilf2eb0a22008-05-02 14:43:14 -040057 btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset);
Chris Masondb945352007-10-15 16:15:53 -040058 btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes);
Sage Weilf2eb0a22008-05-02 14:43:14 -040059 btrfs_set_file_extent_offset(leaf, item, offset);
Chris Masondb945352007-10-15 16:15:53 -040060 btrfs_set_file_extent_num_bytes(leaf, item, num_bytes);
Chris Masonc8b97812008-10-29 14:49:59 -040061 btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes);
Chris Mason5f39d392007-10-15 16:14:19 -040062 btrfs_set_file_extent_generation(leaf, item, trans->transid);
63 btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG);
Chris Masonc8b97812008-10-29 14:49:59 -040064 btrfs_set_file_extent_compression(leaf, item, compression);
65 btrfs_set_file_extent_encryption(leaf, item, encryption);
66 btrfs_set_file_extent_other_encoding(leaf, item, other_encoding);
67
Chris Mason5f39d392007-10-15 16:14:19 -040068 btrfs_mark_buffer_dirty(leaf);
Chris Mason54aa1f42007-06-22 14:16:25 -040069out:
Chris Mason5caf2a02007-04-02 11:20:42 -040070 btrfs_free_path(path);
Chris Mason54aa1f42007-06-22 14:16:25 -040071 return ret;
Chris Mason9f5fae22007-03-20 14:38:32 -040072}
Chris Masondee26a92007-03-26 16:00:06 -040073
Eric Sandeen48a3b632013-04-25 20:41:01 +000074static struct btrfs_csum_item *
75btrfs_lookup_csum(struct btrfs_trans_handle *trans,
76 struct btrfs_root *root,
77 struct btrfs_path *path,
78 u64 bytenr, int cow)
Chris Mason6567e832007-04-16 09:22:45 -040079{
Jeff Mahoney0b246af2016-06-22 18:54:23 -040080 struct btrfs_fs_info *fs_info = root->fs_info;
Chris Mason6567e832007-04-16 09:22:45 -040081 int ret;
82 struct btrfs_key file_key;
83 struct btrfs_key found_key;
84 struct btrfs_csum_item *item;
Chris Mason5f39d392007-10-15 16:14:19 -040085 struct extent_buffer *leaf;
Chris Mason6567e832007-04-16 09:22:45 -040086 u64 csum_offset = 0;
Jeff Mahoney0b246af2016-06-22 18:54:23 -040087 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
Chris Masona429e512007-04-18 16:15:28 -040088 int csums_in_item;
Chris Mason6567e832007-04-16 09:22:45 -040089
Chris Masond20f7042008-12-08 16:58:54 -050090 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
91 file_key.offset = bytenr;
David Sterba962a2982014-06-04 18:41:45 +020092 file_key.type = BTRFS_EXTENT_CSUM_KEY;
Chris Masonb18c6682007-04-17 13:26:50 -040093 ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow);
Chris Mason6567e832007-04-16 09:22:45 -040094 if (ret < 0)
95 goto fail;
Chris Mason5f39d392007-10-15 16:14:19 -040096 leaf = path->nodes[0];
Chris Mason6567e832007-04-16 09:22:45 -040097 if (ret > 0) {
98 ret = 1;
Chris Mason70b2bef2007-04-17 15:39:32 -040099 if (path->slots[0] == 0)
Chris Mason6567e832007-04-16 09:22:45 -0400100 goto fail;
101 path->slots[0]--;
Chris Mason5f39d392007-10-15 16:14:19 -0400102 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
David Sterba962a2982014-06-04 18:41:45 +0200103 if (found_key.type != BTRFS_EXTENT_CSUM_KEY)
Chris Mason6567e832007-04-16 09:22:45 -0400104 goto fail;
Chris Masond20f7042008-12-08 16:58:54 -0500105
106 csum_offset = (bytenr - found_key.offset) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400107 fs_info->sb->s_blocksize_bits;
Chris Mason5f39d392007-10-15 16:14:19 -0400108 csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500109 csums_in_item /= csum_size;
Chris Masona429e512007-04-18 16:15:28 -0400110
Miao Xie82d130f2013-03-28 08:12:15 +0000111 if (csum_offset == csums_in_item) {
Chris Masona429e512007-04-18 16:15:28 -0400112 ret = -EFBIG;
Chris Mason6567e832007-04-16 09:22:45 -0400113 goto fail;
Miao Xie82d130f2013-03-28 08:12:15 +0000114 } else if (csum_offset > csums_in_item) {
115 goto fail;
Chris Mason6567e832007-04-16 09:22:45 -0400116 }
117 }
118 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Chris Mason509659c2007-05-10 12:36:17 -0400119 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500120 csum_offset * csum_size);
Chris Mason6567e832007-04-16 09:22:45 -0400121 return item;
122fail:
123 if (ret > 0)
Chris Masonb18c6682007-04-17 13:26:50 -0400124 ret = -ENOENT;
Chris Mason6567e832007-04-16 09:22:45 -0400125 return ERR_PTR(ret);
126}
127
Chris Masondee26a92007-03-26 16:00:06 -0400128int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans,
129 struct btrfs_root *root,
130 struct btrfs_path *path, u64 objectid,
Chris Mason9773a782007-03-27 11:26:26 -0400131 u64 offset, int mod)
Chris Masondee26a92007-03-26 16:00:06 -0400132{
133 int ret;
134 struct btrfs_key file_key;
135 int ins_len = mod < 0 ? -1 : 0;
136 int cow = mod != 0;
137
138 file_key.objectid = objectid;
Chris Mason70b2bef2007-04-17 15:39:32 -0400139 file_key.offset = offset;
David Sterba962a2982014-06-04 18:41:45 +0200140 file_key.type = BTRFS_EXTENT_DATA_KEY;
Chris Masondee26a92007-03-26 16:00:06 -0400141 ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow);
142 return ret;
143}
Chris Masonf254e522007-03-29 15:15:27 -0400144
Miao Xiefacc8a222013-07-25 19:22:34 +0800145static void btrfs_io_bio_endio_readpage(struct btrfs_io_bio *bio, int err)
146{
147 kfree(bio->csum_allocated);
148}
149
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200150static blk_status_t __btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio,
Josef Bacik4b46fce2010-05-23 11:00:55 -0400151 u64 logical_offset, u32 *dst, int dio)
Chris Mason61b49442008-07-31 15:42:53 -0400152{
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400153 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
Liu Bo17347ce2017-05-15 15:33:27 -0700154 struct bio_vec bvec;
155 struct bvec_iter iter;
Miao Xiefacc8a222013-07-25 19:22:34 +0800156 struct btrfs_io_bio *btrfs_bio = btrfs_io_bio(bio);
157 struct btrfs_csum_item *item = NULL;
158 struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree;
159 struct btrfs_path *path;
160 u8 *csum;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400161 u64 offset = 0;
Chris Mason61b49442008-07-31 15:42:53 -0400162 u64 item_start_offset = 0;
163 u64 item_last_offset = 0;
Chris Masond20f7042008-12-08 16:58:54 -0500164 u64 disk_bytenr;
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530165 u64 page_bytes_left;
Chris Mason61b49442008-07-31 15:42:53 -0400166 u32 diff;
Miao Xiefacc8a222013-07-25 19:22:34 +0800167 int nblocks;
Liu Bo17347ce2017-05-15 15:33:27 -0700168 int count = 0;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400169 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
Chris Mason61b49442008-07-31 15:42:53 -0400170
171 path = btrfs_alloc_path();
Tsutomu Itohc2db1072011-03-01 06:48:31 +0000172 if (!path)
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200173 return BLK_STS_RESOURCE;
Miao Xiefacc8a222013-07-25 19:22:34 +0800174
Kent Overstreet4f024f32013-10-11 15:44:27 -0700175 nblocks = bio->bi_iter.bi_size >> inode->i_sb->s_blocksize_bits;
Miao Xiefacc8a222013-07-25 19:22:34 +0800176 if (!dst) {
177 if (nblocks * csum_size > BTRFS_BIO_INLINE_CSUM_SIZE) {
David Sterba31e818f2015-02-20 18:00:26 +0100178 btrfs_bio->csum_allocated = kmalloc_array(nblocks,
179 csum_size, GFP_NOFS);
Miao Xiefacc8a222013-07-25 19:22:34 +0800180 if (!btrfs_bio->csum_allocated) {
181 btrfs_free_path(path);
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200182 return BLK_STS_RESOURCE;
Miao Xiefacc8a222013-07-25 19:22:34 +0800183 }
184 btrfs_bio->csum = btrfs_bio->csum_allocated;
185 btrfs_bio->end_io = btrfs_io_bio_endio_readpage;
186 } else {
187 btrfs_bio->csum = btrfs_bio->csum_inline;
188 }
189 csum = btrfs_bio->csum;
190 } else {
191 csum = (u8 *)dst;
192 }
193
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300194 if (bio->bi_iter.bi_size > PAGE_SIZE * 8)
David Sterbae4058b52015-11-27 16:31:35 +0100195 path->reada = READA_FORWARD;
Chris Mason61b49442008-07-31 15:42:53 -0400196
Chris Mason2cf85722011-07-26 15:35:09 -0400197 /*
198 * the free space stuff is only read when it hasn't been
199 * updated in the current transaction. So, we can safely
200 * read from the commit root and sidestep a nasty deadlock
201 * between reading the free space cache and updating the csum tree.
202 */
Nikolay Borisov70ddc552017-02-20 13:50:35 +0200203 if (btrfs_is_free_space_inode(BTRFS_I(inode))) {
Chris Mason2cf85722011-07-26 15:35:09 -0400204 path->search_commit_root = 1;
Josef Bacikddf23b32011-09-11 10:52:24 -0400205 path->skip_locking = 1;
206 }
Chris Mason2cf85722011-07-26 15:35:09 -0400207
Kent Overstreet4f024f32013-10-11 15:44:27 -0700208 disk_bytenr = (u64)bio->bi_iter.bi_sector << 9;
Josef Bacik4b46fce2010-05-23 11:00:55 -0400209 if (dio)
210 offset = logical_offset;
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530211
Liu Bo17347ce2017-05-15 15:33:27 -0700212 bio_for_each_segment(bvec, bio, iter) {
213 page_bytes_left = bvec.bv_len;
Christoph Hellwig4989d272016-11-25 09:07:52 +0100214 if (count)
215 goto next;
216
Josef Bacik4b46fce2010-05-23 11:00:55 -0400217 if (!dio)
Liu Bo17347ce2017-05-15 15:33:27 -0700218 offset = page_offset(bvec.bv_page) + bvec.bv_offset;
Miao Xiefacc8a222013-07-25 19:22:34 +0800219 count = btrfs_find_ordered_sum(inode, offset, disk_bytenr,
220 (u32 *)csum, nblocks);
Miao Xiee4100d92013-04-05 07:20:56 +0000221 if (count)
Chris Mason61b49442008-07-31 15:42:53 -0400222 goto found;
223
Chris Masond20f7042008-12-08 16:58:54 -0500224 if (!item || disk_bytenr < item_start_offset ||
225 disk_bytenr >= item_last_offset) {
Chris Mason61b49442008-07-31 15:42:53 -0400226 struct btrfs_key found_key;
227 u32 item_size;
228
229 if (item)
David Sterbab3b4aa72011-04-21 01:20:15 +0200230 btrfs_release_path(path);
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400231 item = btrfs_lookup_csum(NULL, fs_info->csum_root,
Chris Masond20f7042008-12-08 16:58:54 -0500232 path, disk_bytenr, 0);
Chris Mason61b49442008-07-31 15:42:53 -0400233 if (IS_ERR(item)) {
Miao Xiee4100d92013-04-05 07:20:56 +0000234 count = 1;
Miao Xiefacc8a222013-07-25 19:22:34 +0800235 memset(csum, 0, csum_size);
Yan Zheng17d217f2008-12-12 10:03:38 -0500236 if (BTRFS_I(inode)->root->root_key.objectid ==
237 BTRFS_DATA_RELOC_TREE_OBJECTID) {
238 set_extent_bits(io_tree, offset,
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400239 offset + fs_info->sectorsize - 1,
David Sterbaceeb0ae2016-04-26 23:54:39 +0200240 EXTENT_NODATASUM);
Yan Zheng17d217f2008-12-12 10:03:38 -0500241 } else {
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400242 btrfs_info_rl(fs_info,
Frank Holtonefe120a2013-12-20 11:37:06 -0500243 "no csum found for inode %llu start %llu",
Nikolay Borisov4a0cc7c2017-01-10 20:35:31 +0200244 btrfs_ino(BTRFS_I(inode)), offset);
Yan Zheng17d217f2008-12-12 10:03:38 -0500245 }
Chris Mason6dab8152008-08-04 08:35:53 -0400246 item = NULL;
David Sterbab3b4aa72011-04-21 01:20:15 +0200247 btrfs_release_path(path);
Chris Mason61b49442008-07-31 15:42:53 -0400248 goto found;
249 }
250 btrfs_item_key_to_cpu(path->nodes[0], &found_key,
251 path->slots[0]);
252
253 item_start_offset = found_key.offset;
254 item_size = btrfs_item_size_nr(path->nodes[0],
255 path->slots[0]);
256 item_last_offset = item_start_offset +
Josef Bacik607d4322008-12-02 07:17:45 -0500257 (item_size / csum_size) *
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400258 fs_info->sectorsize;
Chris Mason61b49442008-07-31 15:42:53 -0400259 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
260 struct btrfs_csum_item);
261 }
262 /*
263 * this byte range must be able to fit inside
264 * a single leaf so it will also fit inside a u32
265 */
Chris Masond20f7042008-12-08 16:58:54 -0500266 diff = disk_bytenr - item_start_offset;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400267 diff = diff / fs_info->sectorsize;
Josef Bacik607d4322008-12-02 07:17:45 -0500268 diff = diff * csum_size;
Miao Xiefacc8a222013-07-25 19:22:34 +0800269 count = min_t(int, nblocks, (item_last_offset - disk_bytenr) >>
270 inode->i_sb->s_blocksize_bits);
271 read_extent_buffer(path->nodes[0], csum,
Chris Mason3de9d6b2008-08-04 23:17:27 -0400272 ((unsigned long)item) + diff,
Miao Xiee4100d92013-04-05 07:20:56 +0000273 csum_size * count);
Chris Mason61b49442008-07-31 15:42:53 -0400274found:
Miao Xiefacc8a222013-07-25 19:22:34 +0800275 csum += count * csum_size;
276 nblocks -= count;
Christoph Hellwig4989d272016-11-25 09:07:52 +0100277next:
Miao Xiee4100d92013-04-05 07:20:56 +0000278 while (count--) {
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400279 disk_bytenr += fs_info->sectorsize;
280 offset += fs_info->sectorsize;
281 page_bytes_left -= fs_info->sectorsize;
Christoph Hellwig4989d272016-11-25 09:07:52 +0100282 if (!page_bytes_left)
283 break; /* move to next bio */
Miao Xiee4100d92013-04-05 07:20:56 +0000284 }
Chris Mason61b49442008-07-31 15:42:53 -0400285 }
Chris Mason389f2392016-03-21 06:59:09 -0700286
Christoph Hellwig4989d272016-11-25 09:07:52 +0100287 WARN_ON_ONCE(count);
Chris Mason61b49442008-07-31 15:42:53 -0400288 btrfs_free_path(path);
289 return 0;
290}
291
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200292blk_status_t btrfs_lookup_bio_sums(struct inode *inode, struct bio *bio, u32 *dst)
Josef Bacik4b46fce2010-05-23 11:00:55 -0400293{
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400294 return __btrfs_lookup_bio_sums(inode, bio, 0, dst, 0);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400295}
296
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200297blk_status_t btrfs_lookup_bio_sums_dio(struct inode *inode, struct bio *bio, u64 offset)
Josef Bacik4b46fce2010-05-23 11:00:55 -0400298{
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400299 return __btrfs_lookup_bio_sums(inode, bio, offset, NULL, 1);
Josef Bacik4b46fce2010-05-23 11:00:55 -0400300}
301
Yan Zheng17d217f2008-12-12 10:03:38 -0500302int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end,
Arne Jansena2de7332011-03-08 14:14:00 +0100303 struct list_head *list, int search_commit)
Yan Zheng17d217f2008-12-12 10:03:38 -0500304{
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400305 struct btrfs_fs_info *fs_info = root->fs_info;
Yan Zheng17d217f2008-12-12 10:03:38 -0500306 struct btrfs_key key;
307 struct btrfs_path *path;
308 struct extent_buffer *leaf;
309 struct btrfs_ordered_sum *sums;
Yan Zheng17d217f2008-12-12 10:03:38 -0500310 struct btrfs_csum_item *item;
Mark Fasheh0678b612011-08-05 15:46:16 -0700311 LIST_HEAD(tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500312 unsigned long offset;
313 int ret;
314 size_t size;
315 u64 csum_end;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400316 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
Yan Zheng17d217f2008-12-12 10:03:38 -0500317
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400318 ASSERT(IS_ALIGNED(start, fs_info->sectorsize) &&
319 IS_ALIGNED(end + 1, fs_info->sectorsize));
Josef Bacik4277a9c2013-10-15 09:36:40 -0400320
Yan Zheng17d217f2008-12-12 10:03:38 -0500321 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700322 if (!path)
323 return -ENOMEM;
Yan Zheng17d217f2008-12-12 10:03:38 -0500324
Arne Jansena2de7332011-03-08 14:14:00 +0100325 if (search_commit) {
326 path->skip_locking = 1;
David Sterbae4058b52015-11-27 16:31:35 +0100327 path->reada = READA_FORWARD;
Arne Jansena2de7332011-03-08 14:14:00 +0100328 path->search_commit_root = 1;
329 }
330
Yan Zheng17d217f2008-12-12 10:03:38 -0500331 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
332 key.offset = start;
333 key.type = BTRFS_EXTENT_CSUM_KEY;
334
Yan Zheng07d400a2009-01-06 11:42:00 -0500335 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
Yan Zheng17d217f2008-12-12 10:03:38 -0500336 if (ret < 0)
337 goto fail;
338 if (ret > 0 && path->slots[0] > 0) {
339 leaf = path->nodes[0];
340 btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1);
341 if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID &&
342 key.type == BTRFS_EXTENT_CSUM_KEY) {
343 offset = (start - key.offset) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400344 fs_info->sb->s_blocksize_bits;
Yan Zheng17d217f2008-12-12 10:03:38 -0500345 if (offset * csum_size <
346 btrfs_item_size_nr(leaf, path->slots[0] - 1))
347 path->slots[0]--;
348 }
349 }
350
351 while (start <= end) {
352 leaf = path->nodes[0];
353 if (path->slots[0] >= btrfs_header_nritems(leaf)) {
Yan Zheng07d400a2009-01-06 11:42:00 -0500354 ret = btrfs_next_leaf(root, path);
Yan Zheng17d217f2008-12-12 10:03:38 -0500355 if (ret < 0)
356 goto fail;
357 if (ret > 0)
358 break;
359 leaf = path->nodes[0];
360 }
361
362 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
363 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Zhi Yong Wu628c8282013-03-18 09:18:09 +0000364 key.type != BTRFS_EXTENT_CSUM_KEY ||
365 key.offset > end)
Yan Zheng17d217f2008-12-12 10:03:38 -0500366 break;
367
368 if (key.offset > start)
369 start = key.offset;
370
371 size = btrfs_item_size_nr(leaf, path->slots[0]);
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400372 csum_end = key.offset + (size / csum_size) * fs_info->sectorsize;
Yan Zheng87b29b22008-12-17 10:21:48 -0500373 if (csum_end <= start) {
374 path->slots[0]++;
375 continue;
376 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500377
Yan Zheng07d400a2009-01-06 11:42:00 -0500378 csum_end = min(csum_end, end + 1);
Yan Zheng17d217f2008-12-12 10:03:38 -0500379 item = btrfs_item_ptr(path->nodes[0], path->slots[0],
380 struct btrfs_csum_item);
Yan Zheng07d400a2009-01-06 11:42:00 -0500381 while (start < csum_end) {
382 size = min_t(size_t, csum_end - start,
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400383 MAX_ORDERED_SUM_BYTES(fs_info));
384 sums = kzalloc(btrfs_ordered_sum_size(fs_info, size),
Miao Xief51a4a12013-06-19 10:36:09 +0800385 GFP_NOFS);
Mark Fasheh0678b612011-08-05 15:46:16 -0700386 if (!sums) {
387 ret = -ENOMEM;
388 goto fail;
389 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500390
Yan Zheng07d400a2009-01-06 11:42:00 -0500391 sums->bytenr = start;
Miao Xief51a4a12013-06-19 10:36:09 +0800392 sums->len = (int)size;
Yan Zheng07d400a2009-01-06 11:42:00 -0500393
394 offset = (start - key.offset) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400395 fs_info->sb->s_blocksize_bits;
Yan Zheng07d400a2009-01-06 11:42:00 -0500396 offset *= csum_size;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400397 size >>= fs_info->sb->s_blocksize_bits;
Yan Zheng07d400a2009-01-06 11:42:00 -0500398
Miao Xief51a4a12013-06-19 10:36:09 +0800399 read_extent_buffer(path->nodes[0],
400 sums->sums,
401 ((unsigned long)item) + offset,
402 csum_size * size);
Yan Zheng07d400a2009-01-06 11:42:00 -0500403
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400404 start += fs_info->sectorsize * size;
Mark Fasheh0678b612011-08-05 15:46:16 -0700405 list_add_tail(&sums->list, &tmplist);
Yan Zheng17d217f2008-12-12 10:03:38 -0500406 }
Yan Zheng17d217f2008-12-12 10:03:38 -0500407 path->slots[0]++;
408 }
409 ret = 0;
410fail:
Mark Fasheh0678b612011-08-05 15:46:16 -0700411 while (ret < 0 && !list_empty(&tmplist)) {
Chris Mason6e5aafb2014-11-04 06:59:04 -0800412 sums = list_entry(tmplist.next, struct btrfs_ordered_sum, list);
Mark Fasheh0678b612011-08-05 15:46:16 -0700413 list_del(&sums->list);
414 kfree(sums);
415 }
416 list_splice_tail(&tmplist, list);
417
Yan Zheng17d217f2008-12-12 10:03:38 -0500418 btrfs_free_path(path);
419 return ret;
420}
421
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200422blk_status_t btrfs_csum_one_bio(struct inode *inode, struct bio *bio,
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400423 u64 file_start, int contig)
Chris Masone0156402008-04-16 11:15:20 -0400424{
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400425 struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400426 struct btrfs_ordered_sum *sums;
Christoph Hellwig6cd7ce42016-11-25 09:07:49 +0100427 struct btrfs_ordered_extent *ordered = NULL;
Chris Masone0156402008-04-16 11:15:20 -0400428 char *data;
Liu Bo17347ce2017-05-15 15:33:27 -0700429 struct bvec_iter iter;
430 struct bio_vec bvec;
Miao Xief51a4a12013-06-19 10:36:09 +0800431 int index;
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530432 int nr_sectors;
Chris Mason3edf7d32008-07-18 06:17:13 -0400433 unsigned long total_bytes = 0;
434 unsigned long this_sum_bytes = 0;
Liu Bo17347ce2017-05-15 15:33:27 -0700435 int i;
Chris Mason3edf7d32008-07-18 06:17:13 -0400436 u64 offset;
Chris Masone0156402008-04-16 11:15:20 -0400437
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400438 sums = kzalloc(btrfs_ordered_sum_size(fs_info, bio->bi_iter.bi_size),
Kent Overstreet4f024f32013-10-11 15:44:27 -0700439 GFP_NOFS);
Chris Masone0156402008-04-16 11:15:20 -0400440 if (!sums)
Christoph Hellwig4e4cbee2017-06-03 09:38:06 +0200441 return BLK_STS_RESOURCE;
Chris Mason3edf7d32008-07-18 06:17:13 -0400442
Kent Overstreet4f024f32013-10-11 15:44:27 -0700443 sums->len = bio->bi_iter.bi_size;
Chris Masone6dcd2d2008-07-17 12:53:50 -0400444 INIT_LIST_HEAD(&sums->list);
Chris Masond20f7042008-12-08 16:58:54 -0500445
446 if (contig)
447 offset = file_start;
448 else
Christoph Hellwig6cd7ce42016-11-25 09:07:49 +0100449 offset = 0; /* shut up gcc */
Chris Masond20f7042008-12-08 16:58:54 -0500450
Kent Overstreet4f024f32013-10-11 15:44:27 -0700451 sums->bytenr = (u64)bio->bi_iter.bi_sector << 9;
Miao Xief51a4a12013-06-19 10:36:09 +0800452 index = 0;
Chris Masone0156402008-04-16 11:15:20 -0400453
Liu Bo17347ce2017-05-15 15:33:27 -0700454 bio_for_each_segment(bvec, bio, iter) {
Chris Masond20f7042008-12-08 16:58:54 -0500455 if (!contig)
Liu Bo17347ce2017-05-15 15:33:27 -0700456 offset = page_offset(bvec.bv_page) + bvec.bv_offset;
Chris Masond20f7042008-12-08 16:58:54 -0500457
Christoph Hellwig6cd7ce42016-11-25 09:07:49 +0100458 if (!ordered) {
459 ordered = btrfs_lookup_ordered_extent(inode, offset);
460 BUG_ON(!ordered); /* Logic error */
461 }
462
Liu Bo17347ce2017-05-15 15:33:27 -0700463 data = kmap_atomic(bvec.bv_page);
Chris Mason3edf7d32008-07-18 06:17:13 -0400464
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400465 nr_sectors = BTRFS_BYTES_TO_BLKS(fs_info,
Liu Bo17347ce2017-05-15 15:33:27 -0700466 bvec.bv_len + fs_info->sectorsize
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400467 - 1);
Chris Mason3edf7d32008-07-18 06:17:13 -0400468
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530469 for (i = 0; i < nr_sectors; i++) {
470 if (offset >= ordered->file_offset + ordered->len ||
471 offset < ordered->file_offset) {
472 unsigned long bytes_left;
473
474 kunmap_atomic(data);
475 sums->len = this_sum_bytes;
476 this_sum_bytes = 0;
477 btrfs_add_ordered_sum(inode, ordered, sums);
478 btrfs_put_ordered_extent(ordered);
479
480 bytes_left = bio->bi_iter.bi_size - total_bytes;
481
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400482 sums = kzalloc(btrfs_ordered_sum_size(fs_info, bytes_left),
483 GFP_NOFS);
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530484 BUG_ON(!sums); /* -ENOMEM */
485 sums->len = bytes_left;
486 ordered = btrfs_lookup_ordered_extent(inode,
487 offset);
488 ASSERT(ordered); /* Logic error */
489 sums->bytenr = ((u64)bio->bi_iter.bi_sector << 9)
490 + total_bytes;
491 index = 0;
492
Liu Bo17347ce2017-05-15 15:33:27 -0700493 data = kmap_atomic(bvec.bv_page);
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530494 }
495
496 sums->sums[index] = ~(u32)0;
497 sums->sums[index]
Liu Bo17347ce2017-05-15 15:33:27 -0700498 = btrfs_csum_data(data + bvec.bv_offset
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400499 + (i * fs_info->sectorsize),
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530500 sums->sums[index],
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400501 fs_info->sectorsize);
Chandan Rajendrac40a3d32016-01-21 15:55:54 +0530502 btrfs_csum_final(sums->sums[index],
503 (char *)(sums->sums + index));
504 index++;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400505 offset += fs_info->sectorsize;
506 this_sum_bytes += fs_info->sectorsize;
507 total_bytes += fs_info->sectorsize;
Chris Mason3edf7d32008-07-18 06:17:13 -0400508 }
509
Cong Wang7ac687d2011-11-25 23:14:28 +0800510 kunmap_atomic(data);
Chris Masone0156402008-04-16 11:15:20 -0400511 }
Chris Masoned98b562008-07-22 23:06:42 -0400512 this_sum_bytes = 0;
Chris Mason3edf7d32008-07-18 06:17:13 -0400513 btrfs_add_ordered_sum(inode, ordered, sums);
514 btrfs_put_ordered_extent(ordered);
Chris Masone0156402008-04-16 11:15:20 -0400515 return 0;
516}
517
Chris Mason459931e2008-12-10 09:10:46 -0500518/*
519 * helper function for csum removal, this expects the
520 * key to describe the csum pointed to by the path, and it expects
521 * the csum to overlap the range [bytenr, len]
522 *
523 * The csum should not be entirely contained in the range and the
524 * range should not be entirely contained in the csum.
525 *
526 * This calls btrfs_truncate_item with the correct args based on the
527 * overlap, and fixes up the key as required.
528 */
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400529static noinline void truncate_one_csum(struct btrfs_fs_info *fs_info,
Jeff Mahoney143bede2012-03-01 14:56:26 +0100530 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;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400535 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
Chris Mason459931e2008-12-10 09:10:46 -0500536 u64 csum_end;
537 u64 end_byte = bytenr + len;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400538 u32 blocksize_bits = 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;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400542 csum_end <<= fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500543 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 Mahoney2ff7e612016-06-22 18:54:24 -0400554 btrfs_truncate_item(fs_info, 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 Mahoney2ff7e612016-06-22 18:54:24 -0400566 btrfs_truncate_item(fs_info, path, new_size, 0);
Chris Mason459931e2008-12-10 09:10:46 -0500567
568 key->offset = end_byte;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400569 btrfs_set_item_key_safe(fs_info, 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,
Jeff Mahoney5b4aace2016-06-21 10:40:19 -0400580 struct btrfs_fs_info *fs_info, u64 bytenr, u64 len)
Chris Mason459931e2008-12-10 09:10:46 -0500581{
Jeff Mahoney5b4aace2016-06-21 10:40:19 -0400582 struct btrfs_root *root = fs_info->csum_root;
Chris Mason459931e2008-12-10 09:10:46 -0500583 struct btrfs_path *path;
584 struct btrfs_key key;
585 u64 end_byte = bytenr + len;
586 u64 csum_end;
587 struct extent_buffer *leaf;
588 int ret;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400589 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
590 int blocksize_bits = fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500591
Chris Mason459931e2008-12-10 09:10:46 -0500592 path = btrfs_alloc_path();
liubo2a29edc2011-01-26 06:22:08 +0000593 if (!path)
594 return -ENOMEM;
Chris Mason459931e2008-12-10 09:10:46 -0500595
Chris Masond3977122009-01-05 21:25:51 -0500596 while (1) {
Chris Mason459931e2008-12-10 09:10:46 -0500597 key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
598 key.offset = end_byte - 1;
599 key.type = BTRFS_EXTENT_CSUM_KEY;
600
Chris Masonb9473432009-03-13 11:00:37 -0400601 path->leave_spinning = 1;
Chris Mason459931e2008-12-10 09:10:46 -0500602 ret = btrfs_search_slot(trans, root, &key, path, -1, 1);
603 if (ret > 0) {
604 if (path->slots[0] == 0)
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000605 break;
Chris Mason459931e2008-12-10 09:10:46 -0500606 path->slots[0]--;
Josef Bacikad0397a2011-01-28 18:44:44 +0000607 } else if (ret < 0) {
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000608 break;
Chris Mason459931e2008-12-10 09:10:46 -0500609 }
Josef Bacikad0397a2011-01-28 18:44:44 +0000610
Chris Mason459931e2008-12-10 09:10:46 -0500611 leaf = path->nodes[0];
612 btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
613
614 if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
615 key.type != BTRFS_EXTENT_CSUM_KEY) {
616 break;
617 }
618
619 if (key.offset >= end_byte)
620 break;
621
622 csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size;
623 csum_end <<= blocksize_bits;
624 csum_end += key.offset;
625
626 /* this csum ends before we start, we're done */
627 if (csum_end <= bytenr)
628 break;
629
630 /* delete the entire item, it is inside our range */
631 if (key.offset >= bytenr && csum_end <= end_byte) {
Filipe Manana6f546212017-01-28 01:47:56 +0000632 int del_nr = 1;
633
634 /*
635 * Check how many csum items preceding this one in this
636 * leaf correspond to our range and then delete them all
637 * at once.
638 */
639 if (key.offset > bytenr && path->slots[0] > 0) {
640 int slot = path->slots[0] - 1;
641
642 while (slot >= 0) {
643 struct btrfs_key pk;
644
645 btrfs_item_key_to_cpu(leaf, &pk, slot);
646 if (pk.offset < bytenr ||
647 pk.type != BTRFS_EXTENT_CSUM_KEY ||
648 pk.objectid !=
649 BTRFS_EXTENT_CSUM_OBJECTID)
650 break;
651 path->slots[0] = slot;
652 del_nr++;
653 key.offset = pk.offset;
654 slot--;
655 }
656 }
657 ret = btrfs_del_items(trans, root, path,
658 path->slots[0], del_nr);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000659 if (ret)
660 goto out;
Chris Masondcbdd4d2008-12-16 13:51:01 -0500661 if (key.offset == bytenr)
662 break;
Chris Mason459931e2008-12-10 09:10:46 -0500663 } else if (key.offset < bytenr && csum_end > end_byte) {
664 unsigned long offset;
665 unsigned long shift_len;
666 unsigned long item_offset;
667 /*
668 * [ bytenr - len ]
669 * [csum ]
670 *
671 * Our bytes are in the middle of the csum,
672 * we need to split this item and insert a new one.
673 *
674 * But we can't drop the path because the
675 * csum could change, get removed, extended etc.
676 *
677 * The trick here is the max size of a csum item leaves
678 * enough room in the tree block for a single
679 * item header. So, we split the item in place,
680 * adding a new header pointing to the existing
681 * bytes. Then we loop around again and we have
682 * a nicely formed csum item that we can neatly
683 * truncate.
684 */
685 offset = (bytenr - key.offset) >> blocksize_bits;
686 offset *= csum_size;
687
688 shift_len = (len >> blocksize_bits) * csum_size;
689
690 item_offset = btrfs_item_ptr_offset(leaf,
691 path->slots[0]);
692
David Sterbab159fa22016-11-08 18:09:03 +0100693 memzero_extent_buffer(leaf, item_offset + offset,
Chris Mason459931e2008-12-10 09:10:46 -0500694 shift_len);
695 key.offset = bytenr;
696
697 /*
698 * btrfs_split_item returns -EAGAIN when the
699 * item changed size or key
700 */
701 ret = btrfs_split_item(trans, root, path, &key, offset);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100702 if (ret && ret != -EAGAIN) {
Jeff Mahoney66642832016-06-10 18:19:25 -0400703 btrfs_abort_transaction(trans, ret);
Jeff Mahoney79787ea2012-03-12 16:03:00 +0100704 goto out;
705 }
Chris Mason459931e2008-12-10 09:10:46 -0500706
707 key.offset = end_byte - 1;
708 } else {
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400709 truncate_one_csum(fs_info, path, &key, bytenr, len);
Chris Masondcbdd4d2008-12-16 13:51:01 -0500710 if (key.offset < bytenr)
711 break;
Chris Mason459931e2008-12-10 09:10:46 -0500712 }
David Sterbab3b4aa72011-04-21 01:20:15 +0200713 btrfs_release_path(path);
Chris Mason459931e2008-12-10 09:10:46 -0500714 }
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000715 ret = 0;
Chris Mason459931e2008-12-10 09:10:46 -0500716out:
717 btrfs_free_path(path);
Tsutomu Itoh65a246c2011-05-19 04:37:44 +0000718 return ret;
Chris Mason459931e2008-12-10 09:10:46 -0500719}
720
Chris Mason065631f2008-02-20 12:07:25 -0500721int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans,
Chris Masond20f7042008-12-08 16:58:54 -0500722 struct btrfs_root *root,
Chris Masone6dcd2d2008-07-17 12:53:50 -0400723 struct btrfs_ordered_sum *sums)
Chris Masonf254e522007-03-29 15:15:27 -0400724{
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400725 struct btrfs_fs_info *fs_info = root->fs_info;
Chris Masonf254e522007-03-29 15:15:27 -0400726 struct btrfs_key file_key;
Chris Mason6567e832007-04-16 09:22:45 -0400727 struct btrfs_key found_key;
Chris Mason5caf2a02007-04-02 11:20:42 -0400728 struct btrfs_path *path;
Chris Masonf254e522007-03-29 15:15:27 -0400729 struct btrfs_csum_item *item;
Chris Mason065631f2008-02-20 12:07:25 -0500730 struct btrfs_csum_item *item_end;
Chris Masonff79f812007-10-15 16:22:25 -0400731 struct extent_buffer *leaf = NULL;
Miao Xief51a4a12013-06-19 10:36:09 +0800732 u64 next_offset;
733 u64 total_bytes = 0;
Chris Mason6567e832007-04-16 09:22:45 -0400734 u64 csum_offset;
Miao Xief51a4a12013-06-19 10:36:09 +0800735 u64 bytenr;
Chris Masonf578d4b2007-10-25 15:42:56 -0400736 u32 nritems;
737 u32 ins_size;
Miao Xief51a4a12013-06-19 10:36:09 +0800738 int index = 0;
739 int found_next;
740 int ret;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400741 u16 csum_size = btrfs_super_csum_size(fs_info->super_copy);
Chris Mason6e92f5e2008-02-20 12:07:25 -0500742
Chris Mason5caf2a02007-04-02 11:20:42 -0400743 path = btrfs_alloc_path();
Mark Fashehd8926bb2011-07-13 10:38:47 -0700744 if (!path)
745 return -ENOMEM;
Chris Mason065631f2008-02-20 12:07:25 -0500746again:
747 next_offset = (u64)-1;
748 found_next = 0;
Miao Xief51a4a12013-06-19 10:36:09 +0800749 bytenr = sums->bytenr + total_bytes;
Chris Masond20f7042008-12-08 16:58:54 -0500750 file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID;
Miao Xief51a4a12013-06-19 10:36:09 +0800751 file_key.offset = bytenr;
David Sterba962a2982014-06-04 18:41:45 +0200752 file_key.type = BTRFS_EXTENT_CSUM_KEY;
Chris Masona429e512007-04-18 16:15:28 -0400753
Miao Xief51a4a12013-06-19 10:36:09 +0800754 item = btrfs_lookup_csum(trans, root, path, bytenr, 1);
Chris Masonff79f812007-10-15 16:22:25 -0400755 if (!IS_ERR(item)) {
Chris Mason639cb582008-08-28 06:15:25 -0400756 ret = 0;
Miao Xief51a4a12013-06-19 10:36:09 +0800757 leaf = path->nodes[0];
758 item_end = btrfs_item_ptr(leaf, path->slots[0],
759 struct btrfs_csum_item);
760 item_end = (struct btrfs_csum_item *)((char *)item_end +
761 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Masona429e512007-04-18 16:15:28 -0400762 goto found;
Chris Masonff79f812007-10-15 16:22:25 -0400763 }
Chris Masona429e512007-04-18 16:15:28 -0400764 ret = PTR_ERR(item);
Yan, Zheng4a500fd2010-05-16 10:49:59 -0400765 if (ret != -EFBIG && ret != -ENOENT)
766 goto fail_unlock;
767
Chris Masona429e512007-04-18 16:15:28 -0400768 if (ret == -EFBIG) {
769 u32 item_size;
770 /* we found one, but it isn't big enough yet */
Chris Mason5f39d392007-10-15 16:14:19 -0400771 leaf = path->nodes[0];
772 item_size = btrfs_item_size_nr(leaf, path->slots[0]);
Josef Bacik607d4322008-12-02 07:17:45 -0500773 if ((item_size / csum_size) >=
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400774 MAX_CSUM_ITEMS(fs_info, csum_size)) {
Chris Masona429e512007-04-18 16:15:28 -0400775 /* already at max size, make a new one */
776 goto insert;
777 }
778 } else {
Chris Masonf578d4b2007-10-25 15:42:56 -0400779 int slot = path->slots[0] + 1;
Chris Masona429e512007-04-18 16:15:28 -0400780 /* we didn't find a csum item, insert one */
Chris Masonf578d4b2007-10-25 15:42:56 -0400781 nritems = btrfs_header_nritems(path->nodes[0]);
Filipe Manana35045bf2014-04-09 14:38:34 +0100782 if (!nritems || (path->slots[0] >= nritems - 1)) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400783 ret = btrfs_next_leaf(root, path);
Yanb56baf52007-10-29 12:01:05 -0400784 if (ret == 1)
Chris Masonf578d4b2007-10-25 15:42:56 -0400785 found_next = 1;
Yanb56baf52007-10-29 12:01:05 -0400786 if (ret != 0)
Chris Masonf578d4b2007-10-25 15:42:56 -0400787 goto insert;
Filipe Manana27b9a812014-08-09 21:22:27 +0100788 slot = path->slots[0];
Chris Masonf578d4b2007-10-25 15:42:56 -0400789 }
790 btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot);
Chris Masond20f7042008-12-08 16:58:54 -0500791 if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
792 found_key.type != BTRFS_EXTENT_CSUM_KEY) {
Chris Masonf578d4b2007-10-25 15:42:56 -0400793 found_next = 1;
794 goto insert;
795 }
796 next_offset = found_key.offset;
797 found_next = 1;
Chris Masona429e512007-04-18 16:15:28 -0400798 goto insert;
799 }
800
801 /*
802 * at this point, we know the tree has an item, but it isn't big
803 * enough yet to put our csum in. Grow it
804 */
David Sterbab3b4aa72011-04-21 01:20:15 +0200805 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400806 ret = btrfs_search_slot(trans, root, &file_key, path,
Josef Bacik607d4322008-12-02 07:17:45 -0500807 csum_size, 1);
Chris Mason6567e832007-04-16 09:22:45 -0400808 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400809 goto fail_unlock;
Chris Mason459931e2008-12-10 09:10:46 -0500810
811 if (ret > 0) {
812 if (path->slots[0] == 0)
813 goto insert;
814 path->slots[0]--;
Chris Mason6567e832007-04-16 09:22:45 -0400815 }
Chris Mason459931e2008-12-10 09:10:46 -0500816
Chris Mason5f39d392007-10-15 16:14:19 -0400817 leaf = path->nodes[0];
818 btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
Chris Masond20f7042008-12-08 16:58:54 -0500819 csum_offset = (bytenr - found_key.offset) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400820 fs_info->sb->s_blocksize_bits;
Chris Mason459931e2008-12-10 09:10:46 -0500821
David Sterba962a2982014-06-04 18:41:45 +0200822 if (found_key.type != BTRFS_EXTENT_CSUM_KEY ||
Chris Masond20f7042008-12-08 16:58:54 -0500823 found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID ||
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400824 csum_offset >= MAX_CSUM_ITEMS(fs_info, csum_size)) {
Chris Mason6567e832007-04-16 09:22:45 -0400825 goto insert;
826 }
Chris Mason459931e2008-12-10 09:10:46 -0500827
Liu Bo2f697dc2013-02-04 13:12:18 +0000828 if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) /
Josef Bacik607d4322008-12-02 07:17:45 -0500829 csum_size) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000830 int extend_nr;
831 u64 tmp;
832 u32 diff;
833 u32 free_space;
Chris Mason459931e2008-12-10 09:10:46 -0500834
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400835 if (btrfs_leaf_free_space(fs_info, leaf) <
Liu Bo2f697dc2013-02-04 13:12:18 +0000836 sizeof(struct btrfs_item) + csum_size * 2)
837 goto insert;
838
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400839 free_space = btrfs_leaf_free_space(fs_info, leaf) -
Liu Bo2f697dc2013-02-04 13:12:18 +0000840 sizeof(struct btrfs_item) - csum_size;
Miao Xief51a4a12013-06-19 10:36:09 +0800841 tmp = sums->len - total_bytes;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400842 tmp >>= fs_info->sb->s_blocksize_bits;
Liu Bo2f697dc2013-02-04 13:12:18 +0000843 WARN_ON(tmp < 1);
844
845 extend_nr = max_t(int, 1, (int)tmp);
846 diff = (csum_offset + extend_nr) * csum_size;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400847 diff = min(diff,
848 MAX_CSUM_ITEMS(fs_info, csum_size) * csum_size);
Chris Mason459931e2008-12-10 09:10:46 -0500849
Chris Mason5f39d392007-10-15 16:14:19 -0400850 diff = diff - btrfs_item_size_nr(leaf, path->slots[0]);
Liu Bo2f697dc2013-02-04 13:12:18 +0000851 diff = min(free_space, diff);
852 diff /= csum_size;
853 diff *= csum_size;
Chris Mason459931e2008-12-10 09:10:46 -0500854
Jeff Mahoney2ff7e612016-06-22 18:54:24 -0400855 btrfs_extend_item(fs_info, path, diff);
Miao Xief51a4a12013-06-19 10:36:09 +0800856 ret = 0;
Chris Mason6567e832007-04-16 09:22:45 -0400857 goto csum;
858 }
859
860insert:
David Sterbab3b4aa72011-04-21 01:20:15 +0200861 btrfs_release_path(path);
Chris Mason6567e832007-04-16 09:22:45 -0400862 csum_offset = 0;
Chris Masonf578d4b2007-10-25 15:42:56 -0400863 if (found_next) {
Liu Bo2f697dc2013-02-04 13:12:18 +0000864 u64 tmp;
Chris Masond20f7042008-12-08 16:58:54 -0500865
Miao Xief51a4a12013-06-19 10:36:09 +0800866 tmp = sums->len - total_bytes;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400867 tmp >>= fs_info->sb->s_blocksize_bits;
Liu Bo2f697dc2013-02-04 13:12:18 +0000868 tmp = min(tmp, (next_offset - file_key.offset) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400869 fs_info->sb->s_blocksize_bits);
Liu Bo2f697dc2013-02-04 13:12:18 +0000870
Seraphime Kirkovski50d04462016-12-15 14:38:28 +0100871 tmp = max_t(u64, 1, tmp);
872 tmp = min_t(u64, tmp, MAX_CSUM_ITEMS(fs_info, csum_size));
Josef Bacik607d4322008-12-02 07:17:45 -0500873 ins_size = csum_size * tmp;
Chris Masonf578d4b2007-10-25 15:42:56 -0400874 } else {
Josef Bacik607d4322008-12-02 07:17:45 -0500875 ins_size = csum_size;
Chris Masonf578d4b2007-10-25 15:42:56 -0400876 }
Chris Masonb9473432009-03-13 11:00:37 -0400877 path->leave_spinning = 1;
Chris Mason5caf2a02007-04-02 11:20:42 -0400878 ret = btrfs_insert_empty_item(trans, root, path, &file_key,
Chris Masonf578d4b2007-10-25 15:42:56 -0400879 ins_size);
Chris Masonb9473432009-03-13 11:00:37 -0400880 path->leave_spinning = 0;
Chris Mason54aa1f42007-06-22 14:16:25 -0400881 if (ret < 0)
Chris Mason53863232008-08-15 15:34:18 -0400882 goto fail_unlock;
Dulshani Gunawardhanafae7f212013-10-31 10:30:08 +0530883 if (WARN_ON(ret != 0))
Chris Mason53863232008-08-15 15:34:18 -0400884 goto fail_unlock;
Chris Mason5f39d392007-10-15 16:14:19 -0400885 leaf = path->nodes[0];
Miao Xief51a4a12013-06-19 10:36:09 +0800886csum:
Chris Mason5f39d392007-10-15 16:14:19 -0400887 item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item);
Miao Xief51a4a12013-06-19 10:36:09 +0800888 item_end = (struct btrfs_csum_item *)((unsigned char *)item +
889 btrfs_item_size_nr(leaf, path->slots[0]));
Chris Mason509659c2007-05-10 12:36:17 -0400890 item = (struct btrfs_csum_item *)((unsigned char *)item +
Josef Bacik607d4322008-12-02 07:17:45 -0500891 csum_offset * csum_size);
Chris Masonb18c6682007-04-17 13:26:50 -0400892found:
Miao Xief51a4a12013-06-19 10:36:09 +0800893 ins_size = (u32)(sums->len - total_bytes) >>
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400894 fs_info->sb->s_blocksize_bits;
Miao Xief51a4a12013-06-19 10:36:09 +0800895 ins_size *= csum_size;
896 ins_size = min_t(u32, (unsigned long)item_end - (unsigned long)item,
897 ins_size);
898 write_extent_buffer(leaf, sums->sums + index, (unsigned long)item,
899 ins_size);
Chris Masonaadfeb62008-01-29 09:10:27 -0500900
Miao Xief51a4a12013-06-19 10:36:09 +0800901 ins_size /= csum_size;
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400902 total_bytes += ins_size * fs_info->sectorsize;
Miao Xief51a4a12013-06-19 10:36:09 +0800903 index += ins_size;
Chris Masona6591712011-07-19 12:04:14 -0400904
Chris Mason5caf2a02007-04-02 11:20:42 -0400905 btrfs_mark_buffer_dirty(path->nodes[0]);
Chris Masone6dcd2d2008-07-17 12:53:50 -0400906 if (total_bytes < sums->len) {
David Sterbab3b4aa72011-04-21 01:20:15 +0200907 btrfs_release_path(path);
Chris Masonb9473432009-03-13 11:00:37 -0400908 cond_resched();
Chris Mason065631f2008-02-20 12:07:25 -0500909 goto again;
910 }
Chris Mason53863232008-08-15 15:34:18 -0400911out:
Chris Mason5caf2a02007-04-02 11:20:42 -0400912 btrfs_free_path(path);
Chris Masonf254e522007-03-29 15:15:27 -0400913 return ret;
Chris Mason53863232008-08-15 15:34:18 -0400914
915fail_unlock:
Chris Mason53863232008-08-15 15:34:18 -0400916 goto out;
Chris Masonf254e522007-03-29 15:15:27 -0400917}
Filipe Manana7ffbb592014-06-09 03:48:05 +0100918
Nikolay Borisov9cdc5122017-02-20 13:51:02 +0200919void btrfs_extent_item_to_extent_map(struct btrfs_inode *inode,
Filipe Manana7ffbb592014-06-09 03:48:05 +0100920 const struct btrfs_path *path,
921 struct btrfs_file_extent_item *fi,
922 const bool new_inline,
923 struct extent_map *em)
924{
Nikolay Borisov9cdc5122017-02-20 13:51:02 +0200925 struct btrfs_fs_info *fs_info = btrfs_sb(inode->vfs_inode.i_sb);
926 struct btrfs_root *root = inode->root;
Filipe Manana7ffbb592014-06-09 03:48:05 +0100927 struct extent_buffer *leaf = path->nodes[0];
928 const int slot = path->slots[0];
929 struct btrfs_key key;
930 u64 extent_start, extent_end;
931 u64 bytenr;
932 u8 type = btrfs_file_extent_type(leaf, fi);
933 int compress_type = btrfs_file_extent_compression(leaf, fi);
934
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400935 em->bdev = fs_info->fs_devices->latest_bdev;
Filipe Manana7ffbb592014-06-09 03:48:05 +0100936 btrfs_item_key_to_cpu(leaf, &key, slot);
937 extent_start = key.offset;
938
939 if (type == BTRFS_FILE_EXTENT_REG ||
940 type == BTRFS_FILE_EXTENT_PREALLOC) {
941 extent_end = extent_start +
942 btrfs_file_extent_num_bytes(leaf, fi);
943 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
944 size_t size;
945 size = btrfs_file_extent_inline_len(leaf, slot, fi);
Jeff Mahoneyda170662016-06-15 09:22:56 -0400946 extent_end = ALIGN(extent_start + size,
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400947 fs_info->sectorsize);
Filipe Manana7ffbb592014-06-09 03:48:05 +0100948 }
949
950 em->ram_bytes = btrfs_file_extent_ram_bytes(leaf, fi);
951 if (type == BTRFS_FILE_EXTENT_REG ||
952 type == BTRFS_FILE_EXTENT_PREALLOC) {
953 em->start = extent_start;
954 em->len = extent_end - extent_start;
955 em->orig_start = extent_start -
956 btrfs_file_extent_offset(leaf, fi);
957 em->orig_block_len = btrfs_file_extent_disk_num_bytes(leaf, fi);
958 bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
959 if (bytenr == 0) {
960 em->block_start = EXTENT_MAP_HOLE;
961 return;
962 }
963 if (compress_type != BTRFS_COMPRESS_NONE) {
964 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
965 em->compress_type = compress_type;
966 em->block_start = bytenr;
967 em->block_len = em->orig_block_len;
968 } else {
969 bytenr += btrfs_file_extent_offset(leaf, fi);
970 em->block_start = bytenr;
971 em->block_len = em->len;
972 if (type == BTRFS_FILE_EXTENT_PREALLOC)
973 set_bit(EXTENT_FLAG_PREALLOC, &em->flags);
974 }
975 } else if (type == BTRFS_FILE_EXTENT_INLINE) {
976 em->block_start = EXTENT_MAP_INLINE;
977 em->start = extent_start;
978 em->len = extent_end - extent_start;
979 /*
980 * Initialize orig_start and block_len with the same values
981 * as in inode.c:btrfs_get_extent().
982 */
983 em->orig_start = EXTENT_MAP_HOLE;
984 em->block_len = (u64)-1;
985 if (!new_inline && compress_type != BTRFS_COMPRESS_NONE) {
986 set_bit(EXTENT_FLAG_COMPRESSED, &em->flags);
987 em->compress_type = compress_type;
988 }
989 } else {
Jeff Mahoney0b246af2016-06-22 18:54:23 -0400990 btrfs_err(fs_info,
Nikolay Borisov9cdc5122017-02-20 13:51:02 +0200991 "unknown file extent item type %d, inode %llu, offset %llu, "
992 "root %llu", type, btrfs_ino(inode), extent_start,
Filipe Manana7ffbb592014-06-09 03:48:05 +0100993 root->root_key.objectid);
994 }
995}