Chris Mason | 6cbd557 | 2007-06-12 09:07:21 -0400 | [diff] [blame] | 1 | /* |
| 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 Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 19 | #include <linux/bio.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 20 | #include <linux/slab.h> |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 21 | #include <linux/pagemap.h> |
| 22 | #include <linux/highmem.h> |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 23 | #include "ctree.h" |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 24 | #include "disk-io.h" |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 25 | #include "transaction.h" |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 26 | #include "print-tree.h" |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 27 | |
Jan Schmidt | 995e01b | 2012-08-13 02:52:38 -0600 | [diff] [blame] | 28 | #define __MAX_CSUM_ITEMS(r, size) ((unsigned long)(((BTRFS_LEAF_DATA_SIZE(r) - \ |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 29 | sizeof(struct btrfs_item) * 2) / \ |
| 30 | size) - 1)) |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 31 | |
Zach Brown | 221b831 | 2012-09-20 14:33:00 -0600 | [diff] [blame] | 32 | #define MAX_CSUM_ITEMS(r, size) (min_t(u32, __MAX_CSUM_ITEMS(r, size), \ |
| 33 | PAGE_CACHE_SIZE)) |
Chris Mason | 7ca4be4 | 2012-01-31 20:19:02 -0500 | [diff] [blame] | 34 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 35 | #define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \ |
| 36 | sizeof(struct btrfs_ordered_sum)) / \ |
| 37 | sizeof(struct btrfs_sector_sum) * \ |
| 38 | (r)->sectorsize - (r)->sectorsize) |
| 39 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 40 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 41 | struct btrfs_root *root, |
| 42 | u64 objectid, u64 pos, |
| 43 | u64 disk_offset, u64 disk_num_bytes, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 44 | u64 num_bytes, u64 offset, u64 ram_bytes, |
| 45 | u8 compression, u8 encryption, u16 other_encoding) |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 46 | { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 47 | int ret = 0; |
| 48 | struct btrfs_file_extent_item *item; |
| 49 | struct btrfs_key file_key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 50 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 51 | struct extent_buffer *leaf; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 52 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 53 | path = btrfs_alloc_path(); |
Tsutomu Itoh | db5b493 | 2011-03-23 08:14:16 +0000 | [diff] [blame] | 54 | if (!path) |
| 55 | return -ENOMEM; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 56 | file_key.objectid = objectid; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 57 | file_key.offset = pos; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 58 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
| 59 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 60 | path->leave_spinning = 1; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 61 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 62 | sizeof(*item)); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 63 | if (ret < 0) |
| 64 | goto out; |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 65 | BUG_ON(ret); /* Can't happen */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 66 | leaf = path->nodes[0]; |
| 67 | item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 68 | struct btrfs_file_extent_item); |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 69 | btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 70 | btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes); |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 71 | btrfs_set_file_extent_offset(leaf, item, offset); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 72 | btrfs_set_file_extent_num_bytes(leaf, item, num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 73 | btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 74 | btrfs_set_file_extent_generation(leaf, item, trans->transid); |
| 75 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 76 | 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 Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 80 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 81 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 82 | btrfs_free_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 83 | return ret; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 84 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 85 | |
Eric Sandeen | 48a3b63 | 2013-04-25 20:41:01 +0000 | [diff] [blame] | 86 | static struct btrfs_csum_item * |
| 87 | btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
| 88 | struct btrfs_root *root, |
| 89 | struct btrfs_path *path, |
| 90 | u64 bytenr, int cow) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 91 | { |
| 92 | int ret; |
| 93 | struct btrfs_key file_key; |
| 94 | struct btrfs_key found_key; |
| 95 | struct btrfs_csum_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 96 | struct extent_buffer *leaf; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 97 | u64 csum_offset = 0; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 98 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 99 | int csums_in_item; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 100 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 101 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 102 | file_key.offset = bytenr; |
| 103 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 104 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 105 | if (ret < 0) |
| 106 | goto fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 107 | leaf = path->nodes[0]; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 108 | if (ret > 0) { |
| 109 | ret = 1; |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 110 | if (path->slots[0] == 0) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 111 | goto fail; |
| 112 | path->slots[0]--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 113 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 114 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 115 | goto fail; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 116 | |
| 117 | csum_offset = (bytenr - found_key.offset) >> |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 118 | root->fs_info->sb->s_blocksize_bits; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 119 | csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 120 | csums_in_item /= csum_size; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 121 | |
Miao Xie | 82d130f | 2013-03-28 08:12:15 +0000 | [diff] [blame] | 122 | if (csum_offset == csums_in_item) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 123 | ret = -EFBIG; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 124 | goto fail; |
Miao Xie | 82d130f | 2013-03-28 08:12:15 +0000 | [diff] [blame] | 125 | } else if (csum_offset > csums_in_item) { |
| 126 | goto fail; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 127 | } |
| 128 | } |
| 129 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
Chris Mason | 509659c | 2007-05-10 12:36:17 -0400 | [diff] [blame] | 130 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 131 | csum_offset * csum_size); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 132 | return item; |
| 133 | fail: |
| 134 | if (ret > 0) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 135 | ret = -ENOENT; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 136 | return ERR_PTR(ret); |
| 137 | } |
| 138 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 139 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
| 140 | struct btrfs_root *root, |
| 141 | struct btrfs_path *path, u64 objectid, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 142 | u64 offset, int mod) |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 143 | { |
| 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 Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 150 | file_key.offset = offset; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 151 | 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 Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 155 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 156 | static int __btrfs_lookup_bio_sums(struct btrfs_root *root, |
| 157 | struct inode *inode, struct bio *bio, |
| 158 | u64 logical_offset, u32 *dst, int dio) |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 159 | { |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 160 | u32 sum[16]; |
| 161 | int len; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 162 | struct bio_vec *bvec = bio->bi_io_vec; |
| 163 | int bio_index = 0; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 164 | u64 offset = 0; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 165 | u64 item_start_offset = 0; |
| 166 | u64 item_last_offset = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 167 | u64 disk_bytenr; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 168 | u32 diff; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 169 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 170 | int count; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 171 | struct btrfs_path *path; |
| 172 | struct btrfs_csum_item *item = NULL; |
| 173 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 174 | |
| 175 | path = btrfs_alloc_path(); |
Tsutomu Itoh | c2db107 | 2011-03-01 06:48:31 +0000 | [diff] [blame] | 176 | if (!path) |
| 177 | return -ENOMEM; |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 178 | if (bio->bi_size > PAGE_CACHE_SIZE * 8) |
| 179 | path->reada = 2; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 180 | |
| 181 | WARN_ON(bio->bi_vcnt <= 0); |
| 182 | |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 183 | /* |
| 184 | * the free space stuff is only read when it hasn't been |
| 185 | * updated in the current transaction. So, we can safely |
| 186 | * read from the commit root and sidestep a nasty deadlock |
| 187 | * between reading the free space cache and updating the csum tree. |
| 188 | */ |
Liu Bo | 83eea1f | 2012-07-10 05:28:39 -0600 | [diff] [blame] | 189 | if (btrfs_is_free_space_inode(inode)) { |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 190 | path->search_commit_root = 1; |
Josef Bacik | ddf23b3 | 2011-09-11 10:52:24 -0400 | [diff] [blame] | 191 | path->skip_locking = 1; |
| 192 | } |
Chris Mason | 2cf8572 | 2011-07-26 15:35:09 -0400 | [diff] [blame] | 193 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 194 | disk_bytenr = (u64)bio->bi_sector << 9; |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 195 | if (dio) |
| 196 | offset = logical_offset; |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 197 | while (bio_index < bio->bi_vcnt) { |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 198 | len = min_t(int, ARRAY_SIZE(sum), bio->bi_vcnt - bio_index); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 199 | if (!dio) |
| 200 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 201 | count = btrfs_find_ordered_sum(inode, offset, disk_bytenr, sum, |
| 202 | len); |
| 203 | if (count) |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 204 | goto found; |
| 205 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 206 | if (!item || disk_bytenr < item_start_offset || |
| 207 | disk_bytenr >= item_last_offset) { |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 208 | struct btrfs_key found_key; |
| 209 | u32 item_size; |
| 210 | |
| 211 | if (item) |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 212 | btrfs_release_path(path); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 213 | item = btrfs_lookup_csum(NULL, root->fs_info->csum_root, |
| 214 | path, disk_bytenr, 0); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 215 | if (IS_ERR(item)) { |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 216 | count = 1; |
| 217 | sum[0] = 0; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 218 | if (BTRFS_I(inode)->root->root_key.objectid == |
| 219 | BTRFS_DATA_RELOC_TREE_OBJECTID) { |
| 220 | set_extent_bits(io_tree, offset, |
| 221 | offset + bvec->bv_len - 1, |
| 222 | EXTENT_NODATASUM, GFP_NOFS); |
| 223 | } else { |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 224 | printk(KERN_INFO "btrfs no csum found " |
Li Zefan | 33345d01 | 2011-04-20 10:31:50 +0800 | [diff] [blame] | 225 | "for inode %llu start %llu\n", |
| 226 | (unsigned long long) |
| 227 | btrfs_ino(inode), |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 228 | (unsigned long long)offset); |
| 229 | } |
Chris Mason | 6dab815 | 2008-08-04 08:35:53 -0400 | [diff] [blame] | 230 | item = NULL; |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 231 | btrfs_release_path(path); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 232 | goto found; |
| 233 | } |
| 234 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 235 | path->slots[0]); |
| 236 | |
| 237 | item_start_offset = found_key.offset; |
| 238 | item_size = btrfs_item_size_nr(path->nodes[0], |
| 239 | path->slots[0]); |
| 240 | item_last_offset = item_start_offset + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 241 | (item_size / csum_size) * |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 242 | root->sectorsize; |
| 243 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 244 | struct btrfs_csum_item); |
| 245 | } |
| 246 | /* |
| 247 | * this byte range must be able to fit inside |
| 248 | * a single leaf so it will also fit inside a u32 |
| 249 | */ |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 250 | diff = disk_bytenr - item_start_offset; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 251 | diff = diff / root->sectorsize; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 252 | diff = diff * csum_size; |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 253 | count = min_t(int, len, (item_last_offset - disk_bytenr) >> |
| 254 | inode->i_sb->s_blocksize_bits); |
| 255 | read_extent_buffer(path->nodes[0], sum, |
Chris Mason | 3de9d6b | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 256 | ((unsigned long)item) + diff, |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 257 | csum_size * count); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 258 | found: |
Miao Xie | e4100d9 | 2013-04-05 07:20:56 +0000 | [diff] [blame] | 259 | if (dst) { |
| 260 | memcpy(dst, sum, count * csum_size); |
| 261 | dst += count; |
| 262 | } else { |
| 263 | if (dio) |
| 264 | extent_cache_csums_dio(io_tree, offset, sum, |
| 265 | count); |
| 266 | else |
| 267 | extent_cache_csums(io_tree, bio, bio_index, sum, |
| 268 | count); |
| 269 | } |
| 270 | while (count--) { |
| 271 | disk_bytenr += bvec->bv_len; |
| 272 | offset += bvec->bv_len; |
| 273 | bio_index++; |
| 274 | bvec++; |
| 275 | } |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 276 | } |
| 277 | btrfs_free_path(path); |
| 278 | return 0; |
| 279 | } |
| 280 | |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 281 | int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, |
| 282 | struct bio *bio, u32 *dst) |
| 283 | { |
| 284 | return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0); |
| 285 | } |
| 286 | |
| 287 | int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 288 | struct bio *bio, u64 offset) |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 289 | { |
Josef Bacik | c329861 | 2012-08-03 16:49:19 -0400 | [diff] [blame] | 290 | return __btrfs_lookup_bio_sums(root, inode, bio, offset, NULL, 1); |
Josef Bacik | 4b46fce | 2010-05-23 11:00:55 -0400 | [diff] [blame] | 291 | } |
| 292 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 293 | int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 294 | struct list_head *list, int search_commit) |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 295 | { |
| 296 | struct btrfs_key key; |
| 297 | struct btrfs_path *path; |
| 298 | struct extent_buffer *leaf; |
| 299 | struct btrfs_ordered_sum *sums; |
| 300 | struct btrfs_sector_sum *sector_sum; |
| 301 | struct btrfs_csum_item *item; |
Mark Fasheh | 0678b61 | 2011-08-05 15:46:16 -0700 | [diff] [blame] | 302 | LIST_HEAD(tmplist); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 303 | unsigned long offset; |
| 304 | int ret; |
| 305 | size_t size; |
| 306 | u64 csum_end; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 307 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 308 | |
| 309 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 310 | if (!path) |
| 311 | return -ENOMEM; |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 312 | |
Arne Jansen | a2de733 | 2011-03-08 14:14:00 +0100 | [diff] [blame] | 313 | if (search_commit) { |
| 314 | path->skip_locking = 1; |
| 315 | path->reada = 2; |
| 316 | path->search_commit_root = 1; |
| 317 | } |
| 318 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 319 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 320 | key.offset = start; |
| 321 | key.type = BTRFS_EXTENT_CSUM_KEY; |
| 322 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 323 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 324 | if (ret < 0) |
| 325 | goto fail; |
| 326 | if (ret > 0 && path->slots[0] > 0) { |
| 327 | leaf = path->nodes[0]; |
| 328 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); |
| 329 | if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID && |
| 330 | key.type == BTRFS_EXTENT_CSUM_KEY) { |
| 331 | offset = (start - key.offset) >> |
| 332 | root->fs_info->sb->s_blocksize_bits; |
| 333 | if (offset * csum_size < |
| 334 | btrfs_item_size_nr(leaf, path->slots[0] - 1)) |
| 335 | path->slots[0]--; |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | while (start <= end) { |
| 340 | leaf = path->nodes[0]; |
| 341 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 342 | ret = btrfs_next_leaf(root, path); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 343 | if (ret < 0) |
| 344 | goto fail; |
| 345 | if (ret > 0) |
| 346 | break; |
| 347 | leaf = path->nodes[0]; |
| 348 | } |
| 349 | |
| 350 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 351 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
Zhi Yong Wu | 628c828 | 2013-03-18 09:18:09 +0000 | [diff] [blame] | 352 | key.type != BTRFS_EXTENT_CSUM_KEY || |
| 353 | key.offset > end) |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 354 | break; |
| 355 | |
| 356 | if (key.offset > start) |
| 357 | start = key.offset; |
| 358 | |
| 359 | size = btrfs_item_size_nr(leaf, path->slots[0]); |
| 360 | csum_end = key.offset + (size / csum_size) * root->sectorsize; |
Yan Zheng | 87b29b2 | 2008-12-17 10:21:48 -0500 | [diff] [blame] | 361 | if (csum_end <= start) { |
| 362 | path->slots[0]++; |
| 363 | continue; |
| 364 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 365 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 366 | csum_end = min(csum_end, end + 1); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 367 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 368 | struct btrfs_csum_item); |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 369 | while (start < csum_end) { |
| 370 | size = min_t(size_t, csum_end - start, |
| 371 | MAX_ORDERED_SUM_BYTES(root)); |
| 372 | sums = kzalloc(btrfs_ordered_sum_size(root, size), |
| 373 | GFP_NOFS); |
Mark Fasheh | 0678b61 | 2011-08-05 15:46:16 -0700 | [diff] [blame] | 374 | if (!sums) { |
| 375 | ret = -ENOMEM; |
| 376 | goto fail; |
| 377 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 378 | |
Yan Zheng | 07d400a | 2009-01-06 11:42:00 -0500 | [diff] [blame] | 379 | sector_sum = sums->sums; |
| 380 | sums->bytenr = start; |
| 381 | sums->len = size; |
| 382 | |
| 383 | offset = (start - key.offset) >> |
| 384 | root->fs_info->sb->s_blocksize_bits; |
| 385 | offset *= csum_size; |
| 386 | |
| 387 | while (size > 0) { |
| 388 | read_extent_buffer(path->nodes[0], |
| 389 | §or_sum->sum, |
| 390 | ((unsigned long)item) + |
| 391 | offset, csum_size); |
| 392 | sector_sum->bytenr = start; |
| 393 | |
| 394 | size -= root->sectorsize; |
| 395 | start += root->sectorsize; |
| 396 | offset += csum_size; |
| 397 | sector_sum++; |
| 398 | } |
Mark Fasheh | 0678b61 | 2011-08-05 15:46:16 -0700 | [diff] [blame] | 399 | list_add_tail(&sums->list, &tmplist); |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 400 | } |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 401 | path->slots[0]++; |
| 402 | } |
| 403 | ret = 0; |
| 404 | fail: |
Mark Fasheh | 0678b61 | 2011-08-05 15:46:16 -0700 | [diff] [blame] | 405 | while (ret < 0 && !list_empty(&tmplist)) { |
| 406 | sums = list_entry(&tmplist, struct btrfs_ordered_sum, list); |
| 407 | list_del(&sums->list); |
| 408 | kfree(sums); |
| 409 | } |
| 410 | list_splice_tail(&tmplist, list); |
| 411 | |
Yan Zheng | 17d217f | 2008-12-12 10:03:38 -0500 | [diff] [blame] | 412 | btrfs_free_path(path); |
| 413 | return ret; |
| 414 | } |
| 415 | |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 416 | int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 417 | struct bio *bio, u64 file_start, int contig) |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 418 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 419 | struct btrfs_ordered_sum *sums; |
| 420 | struct btrfs_sector_sum *sector_sum; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 421 | struct btrfs_ordered_extent *ordered; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 422 | char *data; |
| 423 | struct bio_vec *bvec = bio->bi_io_vec; |
| 424 | int bio_index = 0; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 425 | unsigned long total_bytes = 0; |
| 426 | unsigned long this_sum_bytes = 0; |
| 427 | u64 offset; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 428 | u64 disk_bytenr; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 429 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 430 | WARN_ON(bio->bi_vcnt <= 0); |
| 431 | sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS); |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 432 | if (!sums) |
| 433 | return -ENOMEM; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 434 | |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 435 | sector_sum = sums->sums; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 436 | disk_bytenr = (u64)bio->bi_sector << 9; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 437 | sums->len = bio->bi_size; |
| 438 | INIT_LIST_HEAD(&sums->list); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 439 | |
| 440 | if (contig) |
| 441 | offset = file_start; |
| 442 | else |
| 443 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
| 444 | |
| 445 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 446 | BUG_ON(!ordered); /* Logic error */ |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 447 | sums->bytenr = ordered->start; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 448 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 449 | while (bio_index < bio->bi_vcnt) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 450 | if (!contig) |
| 451 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
| 452 | |
Josef Bacik | e58dd74 | 2013-01-22 15:43:09 -0500 | [diff] [blame] | 453 | if (offset >= ordered->file_offset + ordered->len || |
| 454 | offset < ordered->file_offset) { |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 455 | unsigned long bytes_left; |
| 456 | sums->len = this_sum_bytes; |
| 457 | this_sum_bytes = 0; |
| 458 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 459 | btrfs_put_ordered_extent(ordered); |
| 460 | |
| 461 | bytes_left = bio->bi_size - total_bytes; |
| 462 | |
| 463 | sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left), |
| 464 | GFP_NOFS); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 465 | BUG_ON(!sums); /* -ENOMEM */ |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 466 | sector_sum = sums->sums; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 467 | sums->len = bytes_left; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 468 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 469 | BUG_ON(!ordered); /* Logic error */ |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 470 | sums->bytenr = ordered->start; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 471 | } |
| 472 | |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 473 | data = kmap_atomic(bvec->bv_page); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 474 | sector_sum->sum = ~(u32)0; |
Liu Bo | b049668 | 2013-03-14 14:57:45 +0000 | [diff] [blame] | 475 | sector_sum->sum = btrfs_csum_data(data + bvec->bv_offset, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 476 | sector_sum->sum, |
| 477 | bvec->bv_len); |
Cong Wang | 7ac687d | 2011-11-25 23:14:28 +0800 | [diff] [blame] | 478 | kunmap_atomic(data); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 479 | btrfs_csum_final(sector_sum->sum, |
| 480 | (char *)§or_sum->sum); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 481 | sector_sum->bytenr = disk_bytenr; |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 482 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 483 | sector_sum++; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 484 | bio_index++; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 485 | total_bytes += bvec->bv_len; |
| 486 | this_sum_bytes += bvec->bv_len; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 487 | disk_bytenr += bvec->bv_len; |
| 488 | offset += bvec->bv_len; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 489 | bvec++; |
| 490 | } |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 491 | this_sum_bytes = 0; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 492 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 493 | btrfs_put_ordered_extent(ordered); |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 494 | return 0; |
| 495 | } |
| 496 | |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 497 | /* |
| 498 | * helper function for csum removal, this expects the |
| 499 | * key to describe the csum pointed to by the path, and it expects |
| 500 | * the csum to overlap the range [bytenr, len] |
| 501 | * |
| 502 | * The csum should not be entirely contained in the range and the |
| 503 | * range should not be entirely contained in the csum. |
| 504 | * |
| 505 | * This calls btrfs_truncate_item with the correct args based on the |
| 506 | * overlap, and fixes up the key as required. |
| 507 | */ |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 508 | static noinline void truncate_one_csum(struct btrfs_root *root, |
Jeff Mahoney | 143bede | 2012-03-01 14:56:26 +0100 | [diff] [blame] | 509 | struct btrfs_path *path, |
| 510 | struct btrfs_key *key, |
| 511 | u64 bytenr, u64 len) |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 512 | { |
| 513 | struct extent_buffer *leaf; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 514 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 515 | u64 csum_end; |
| 516 | u64 end_byte = bytenr + len; |
| 517 | u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 518 | |
| 519 | leaf = path->nodes[0]; |
| 520 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; |
| 521 | csum_end <<= root->fs_info->sb->s_blocksize_bits; |
| 522 | csum_end += key->offset; |
| 523 | |
| 524 | if (key->offset < bytenr && csum_end <= end_byte) { |
| 525 | /* |
| 526 | * [ bytenr - len ] |
| 527 | * [ ] |
| 528 | * [csum ] |
| 529 | * A simple truncate off the end of the item |
| 530 | */ |
| 531 | u32 new_size = (bytenr - key->offset) >> blocksize_bits; |
| 532 | new_size *= csum_size; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 533 | btrfs_truncate_item(root, path, new_size, 1); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 534 | } else if (key->offset >= bytenr && csum_end > end_byte && |
| 535 | end_byte > key->offset) { |
| 536 | /* |
| 537 | * [ bytenr - len ] |
| 538 | * [ ] |
| 539 | * [csum ] |
| 540 | * we need to truncate from the beginning of the csum |
| 541 | */ |
| 542 | u32 new_size = (csum_end - end_byte) >> blocksize_bits; |
| 543 | new_size *= csum_size; |
| 544 | |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 545 | btrfs_truncate_item(root, path, new_size, 0); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 546 | |
| 547 | key->offset = end_byte; |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 548 | btrfs_set_item_key_safe(root, path, key); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 549 | } else { |
| 550 | BUG(); |
| 551 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 552 | } |
| 553 | |
| 554 | /* |
| 555 | * deletes the csum items from the csum tree for a given |
| 556 | * range of bytes. |
| 557 | */ |
| 558 | int btrfs_del_csums(struct btrfs_trans_handle *trans, |
| 559 | struct btrfs_root *root, u64 bytenr, u64 len) |
| 560 | { |
| 561 | struct btrfs_path *path; |
| 562 | struct btrfs_key key; |
| 563 | u64 end_byte = bytenr + len; |
| 564 | u64 csum_end; |
| 565 | struct extent_buffer *leaf; |
| 566 | int ret; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 567 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 568 | int blocksize_bits = root->fs_info->sb->s_blocksize_bits; |
| 569 | |
| 570 | root = root->fs_info->csum_root; |
| 571 | |
| 572 | path = btrfs_alloc_path(); |
liubo | 2a29edc | 2011-01-26 06:22:08 +0000 | [diff] [blame] | 573 | if (!path) |
| 574 | return -ENOMEM; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 575 | |
Chris Mason | d397712 | 2009-01-05 21:25:51 -0500 | [diff] [blame] | 576 | while (1) { |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 577 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 578 | key.offset = end_byte - 1; |
| 579 | key.type = BTRFS_EXTENT_CSUM_KEY; |
| 580 | |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 581 | path->leave_spinning = 1; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 582 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
| 583 | if (ret > 0) { |
| 584 | if (path->slots[0] == 0) |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 585 | break; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 586 | path->slots[0]--; |
Josef Bacik | ad0397a | 2011-01-28 18:44:44 +0000 | [diff] [blame] | 587 | } else if (ret < 0) { |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 588 | break; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 589 | } |
Josef Bacik | ad0397a | 2011-01-28 18:44:44 +0000 | [diff] [blame] | 590 | |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 591 | leaf = path->nodes[0]; |
| 592 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); |
| 593 | |
| 594 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
| 595 | key.type != BTRFS_EXTENT_CSUM_KEY) { |
| 596 | break; |
| 597 | } |
| 598 | |
| 599 | if (key.offset >= end_byte) |
| 600 | break; |
| 601 | |
| 602 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; |
| 603 | csum_end <<= blocksize_bits; |
| 604 | csum_end += key.offset; |
| 605 | |
| 606 | /* this csum ends before we start, we're done */ |
| 607 | if (csum_end <= bytenr) |
| 608 | break; |
| 609 | |
| 610 | /* delete the entire item, it is inside our range */ |
| 611 | if (key.offset >= bytenr && csum_end <= end_byte) { |
| 612 | ret = btrfs_del_item(trans, root, path); |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 613 | if (ret) |
| 614 | goto out; |
Chris Mason | dcbdd4d | 2008-12-16 13:51:01 -0500 | [diff] [blame] | 615 | if (key.offset == bytenr) |
| 616 | break; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 617 | } else if (key.offset < bytenr && csum_end > end_byte) { |
| 618 | unsigned long offset; |
| 619 | unsigned long shift_len; |
| 620 | unsigned long item_offset; |
| 621 | /* |
| 622 | * [ bytenr - len ] |
| 623 | * [csum ] |
| 624 | * |
| 625 | * Our bytes are in the middle of the csum, |
| 626 | * we need to split this item and insert a new one. |
| 627 | * |
| 628 | * But we can't drop the path because the |
| 629 | * csum could change, get removed, extended etc. |
| 630 | * |
| 631 | * The trick here is the max size of a csum item leaves |
| 632 | * enough room in the tree block for a single |
| 633 | * item header. So, we split the item in place, |
| 634 | * adding a new header pointing to the existing |
| 635 | * bytes. Then we loop around again and we have |
| 636 | * a nicely formed csum item that we can neatly |
| 637 | * truncate. |
| 638 | */ |
| 639 | offset = (bytenr - key.offset) >> blocksize_bits; |
| 640 | offset *= csum_size; |
| 641 | |
| 642 | shift_len = (len >> blocksize_bits) * csum_size; |
| 643 | |
| 644 | item_offset = btrfs_item_ptr_offset(leaf, |
| 645 | path->slots[0]); |
| 646 | |
| 647 | memset_extent_buffer(leaf, 0, item_offset + offset, |
| 648 | shift_len); |
| 649 | key.offset = bytenr; |
| 650 | |
| 651 | /* |
| 652 | * btrfs_split_item returns -EAGAIN when the |
| 653 | * item changed size or key |
| 654 | */ |
| 655 | ret = btrfs_split_item(trans, root, path, &key, offset); |
Jeff Mahoney | 79787ea | 2012-03-12 16:03:00 +0100 | [diff] [blame] | 656 | if (ret && ret != -EAGAIN) { |
| 657 | btrfs_abort_transaction(trans, root, ret); |
| 658 | goto out; |
| 659 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 660 | |
| 661 | key.offset = end_byte - 1; |
| 662 | } else { |
Tsutomu Itoh | afe5fea | 2013-04-16 05:18:22 +0000 | [diff] [blame] | 663 | truncate_one_csum(root, path, &key, bytenr, len); |
Chris Mason | dcbdd4d | 2008-12-16 13:51:01 -0500 | [diff] [blame] | 664 | if (key.offset < bytenr) |
| 665 | break; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 666 | } |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 667 | btrfs_release_path(path); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 668 | } |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 669 | ret = 0; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 670 | out: |
| 671 | btrfs_free_path(path); |
Tsutomu Itoh | 65a246c | 2011-05-19 04:37:44 +0000 | [diff] [blame] | 672 | return ret; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 673 | } |
| 674 | |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 675 | static u64 btrfs_sector_sum_left(struct btrfs_ordered_sum *sums, |
| 676 | struct btrfs_sector_sum *sector_sum, |
| 677 | u64 total_bytes, u64 sectorsize) |
| 678 | { |
| 679 | u64 tmp = sectorsize; |
| 680 | u64 next_sector = sector_sum->bytenr; |
| 681 | struct btrfs_sector_sum *next = sector_sum + 1; |
| 682 | |
| 683 | while ((tmp + total_bytes) < sums->len) { |
| 684 | if (next_sector + sectorsize != next->bytenr) |
| 685 | break; |
| 686 | tmp += sectorsize; |
| 687 | next_sector = next->bytenr; |
| 688 | next++; |
| 689 | } |
| 690 | return tmp; |
| 691 | } |
| 692 | |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 693 | int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 694 | struct btrfs_root *root, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 695 | struct btrfs_ordered_sum *sums) |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 696 | { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 697 | u64 bytenr; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 698 | int ret; |
| 699 | struct btrfs_key file_key; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 700 | struct btrfs_key found_key; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 701 | u64 next_offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 702 | u64 total_bytes = 0; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 703 | int found_next; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 704 | struct btrfs_path *path; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 705 | struct btrfs_csum_item *item; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 706 | struct btrfs_csum_item *item_end; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 707 | struct extent_buffer *leaf = NULL; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 708 | u64 csum_offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 709 | struct btrfs_sector_sum *sector_sum; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 710 | u32 nritems; |
| 711 | u32 ins_size; |
David Sterba | 6c41761 | 2011-04-13 15:41:04 +0200 | [diff] [blame] | 712 | u16 csum_size = btrfs_super_csum_size(root->fs_info->super_copy); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 713 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 714 | path = btrfs_alloc_path(); |
Mark Fasheh | d8926bb | 2011-07-13 10:38:47 -0700 | [diff] [blame] | 715 | if (!path) |
| 716 | return -ENOMEM; |
| 717 | |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 718 | sector_sum = sums->sums; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 719 | again: |
| 720 | next_offset = (u64)-1; |
| 721 | found_next = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 722 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 723 | file_key.offset = sector_sum->bytenr; |
| 724 | bytenr = sector_sum->bytenr; |
| 725 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 726 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 727 | item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1); |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 728 | if (!IS_ERR(item)) { |
| 729 | leaf = path->nodes[0]; |
Chris Mason | 639cb58 | 2008-08-28 06:15:25 -0400 | [diff] [blame] | 730 | ret = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 731 | goto found; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 732 | } |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 733 | ret = PTR_ERR(item); |
Yan, Zheng | 4a500fd | 2010-05-16 10:49:59 -0400 | [diff] [blame] | 734 | if (ret != -EFBIG && ret != -ENOENT) |
| 735 | goto fail_unlock; |
| 736 | |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 737 | if (ret == -EFBIG) { |
| 738 | u32 item_size; |
| 739 | /* we found one, but it isn't big enough yet */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 740 | leaf = path->nodes[0]; |
| 741 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 742 | if ((item_size / csum_size) >= |
| 743 | MAX_CSUM_ITEMS(root, csum_size)) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 744 | /* already at max size, make a new one */ |
| 745 | goto insert; |
| 746 | } |
| 747 | } else { |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 748 | int slot = path->slots[0] + 1; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 749 | /* we didn't find a csum item, insert one */ |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 750 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 751 | if (path->slots[0] >= nritems - 1) { |
| 752 | ret = btrfs_next_leaf(root, path); |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 753 | if (ret == 1) |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 754 | found_next = 1; |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 755 | if (ret != 0) |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 756 | goto insert; |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 757 | slot = 0; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 758 | } |
| 759 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 760 | if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
| 761 | found_key.type != BTRFS_EXTENT_CSUM_KEY) { |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 762 | found_next = 1; |
| 763 | goto insert; |
| 764 | } |
| 765 | next_offset = found_key.offset; |
| 766 | found_next = 1; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 767 | goto insert; |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * at this point, we know the tree has an item, but it isn't big |
| 772 | * enough yet to put our csum in. Grow it |
| 773 | */ |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 774 | btrfs_release_path(path); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 775 | ret = btrfs_search_slot(trans, root, &file_key, path, |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 776 | csum_size, 1); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 777 | if (ret < 0) |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 778 | goto fail_unlock; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 779 | |
| 780 | if (ret > 0) { |
| 781 | if (path->slots[0] == 0) |
| 782 | goto insert; |
| 783 | path->slots[0]--; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 784 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 785 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 786 | leaf = path->nodes[0]; |
| 787 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 788 | csum_offset = (bytenr - found_key.offset) >> |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 789 | root->fs_info->sb->s_blocksize_bits; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 790 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 791 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY || |
| 792 | found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 793 | csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) { |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 794 | goto insert; |
| 795 | } |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 796 | |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 797 | if (csum_offset == btrfs_item_size_nr(leaf, path->slots[0]) / |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 798 | csum_size) { |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 799 | int extend_nr; |
| 800 | u64 tmp; |
| 801 | u32 diff; |
| 802 | u32 free_space; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 803 | |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 804 | if (btrfs_leaf_free_space(root, leaf) < |
| 805 | sizeof(struct btrfs_item) + csum_size * 2) |
| 806 | goto insert; |
| 807 | |
| 808 | free_space = btrfs_leaf_free_space(root, leaf) - |
| 809 | sizeof(struct btrfs_item) - csum_size; |
| 810 | tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes, |
| 811 | root->sectorsize); |
| 812 | tmp >>= root->fs_info->sb->s_blocksize_bits; |
| 813 | WARN_ON(tmp < 1); |
| 814 | |
| 815 | extend_nr = max_t(int, 1, (int)tmp); |
| 816 | diff = (csum_offset + extend_nr) * csum_size; |
| 817 | diff = min(diff, MAX_CSUM_ITEMS(root, csum_size) * csum_size); |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 818 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 819 | diff = diff - btrfs_item_size_nr(leaf, path->slots[0]); |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 820 | diff = min(free_space, diff); |
| 821 | diff /= csum_size; |
| 822 | diff *= csum_size; |
Chris Mason | 459931e | 2008-12-10 09:10:46 -0500 | [diff] [blame] | 823 | |
Tsutomu Itoh | 4b90c68 | 2013-04-16 05:18:49 +0000 | [diff] [blame] | 824 | btrfs_extend_item(root, path, diff); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 825 | goto csum; |
| 826 | } |
| 827 | |
| 828 | insert: |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 829 | btrfs_release_path(path); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 830 | csum_offset = 0; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 831 | if (found_next) { |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 832 | u64 tmp; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 833 | |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 834 | tmp = btrfs_sector_sum_left(sums, sector_sum, total_bytes, |
| 835 | root->sectorsize); |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 836 | tmp >>= root->fs_info->sb->s_blocksize_bits; |
Liu Bo | 2f697dc | 2013-02-04 13:12:18 +0000 | [diff] [blame] | 837 | tmp = min(tmp, (next_offset - file_key.offset) >> |
| 838 | root->fs_info->sb->s_blocksize_bits); |
| 839 | |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 840 | tmp = max((u64)1, tmp); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 841 | tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size)); |
| 842 | ins_size = csum_size * tmp; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 843 | } else { |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 844 | ins_size = csum_size; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 845 | } |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 846 | path->leave_spinning = 1; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 847 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 848 | ins_size); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 849 | path->leave_spinning = 0; |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 850 | if (ret < 0) |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 851 | goto fail_unlock; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 852 | if (ret != 0) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 853 | WARN_ON(1); |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 854 | goto fail_unlock; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 855 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 856 | csum: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 857 | leaf = path->nodes[0]; |
| 858 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 859 | ret = 0; |
Chris Mason | 509659c | 2007-05-10 12:36:17 -0400 | [diff] [blame] | 860 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 861 | csum_offset * csum_size); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 862 | found: |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 863 | item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
| 864 | item_end = (struct btrfs_csum_item *)((unsigned char *)item_end + |
| 865 | btrfs_item_size_nr(leaf, path->slots[0])); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 866 | next_sector: |
Chris Mason | aadfeb6 | 2008-01-29 09:10:27 -0500 | [diff] [blame] | 867 | |
Chris Mason | a659171 | 2011-07-19 12:04:14 -0400 | [diff] [blame] | 868 | write_extent_buffer(leaf, §or_sum->sum, (unsigned long)item, csum_size); |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 869 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 870 | total_bytes += root->sectorsize; |
| 871 | sector_sum++; |
| 872 | if (total_bytes < sums->len) { |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 873 | item = (struct btrfs_csum_item *)((char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 874 | csum_size); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame] | 875 | if (item < item_end && bytenr + PAGE_CACHE_SIZE == |
| 876 | sector_sum->bytenr) { |
| 877 | bytenr = sector_sum->bytenr; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 878 | goto next_sector; |
Chris Mason | 2e1a992 | 2008-02-20 15:44:32 -0500 | [diff] [blame] | 879 | } |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 880 | } |
Chris Mason | a659171 | 2011-07-19 12:04:14 -0400 | [diff] [blame] | 881 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 882 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 883 | if (total_bytes < sums->len) { |
David Sterba | b3b4aa7 | 2011-04-21 01:20:15 +0200 | [diff] [blame] | 884 | btrfs_release_path(path); |
Chris Mason | b947343 | 2009-03-13 11:00:37 -0400 | [diff] [blame] | 885 | cond_resched(); |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 886 | goto again; |
| 887 | } |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 888 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 889 | btrfs_free_path(path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 890 | return ret; |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 891 | |
| 892 | fail_unlock: |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 893 | goto out; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 894 | } |