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> |
| 20 | #include <linux/pagemap.h> |
| 21 | #include <linux/highmem.h> |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 22 | #include "ctree.h" |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 23 | #include "disk-io.h" |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 24 | #include "transaction.h" |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 25 | #include "print-tree.h" |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 26 | |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 27 | #define MAX_CSUM_ITEMS(r,size) ((((BTRFS_LEAF_DATA_SIZE(r) - \ |
| 28 | sizeof(struct btrfs_item) * 2) / \ |
| 29 | size) - 1)) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 30 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 31 | struct btrfs_root *root, |
| 32 | u64 objectid, u64 pos, |
| 33 | u64 disk_offset, u64 disk_num_bytes, |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 34 | u64 num_bytes, u64 offset, u64 ram_bytes, |
| 35 | u8 compression, u8 encryption, u16 other_encoding) |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 36 | { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 37 | int ret = 0; |
| 38 | struct btrfs_file_extent_item *item; |
| 39 | struct btrfs_key file_key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 40 | struct btrfs_path *path; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 41 | struct extent_buffer *leaf; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 42 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 43 | path = btrfs_alloc_path(); |
| 44 | BUG_ON(!path); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 45 | file_key.objectid = objectid; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 46 | file_key.offset = pos; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 47 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
| 48 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 49 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 50 | sizeof(*item)); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 51 | if (ret < 0) |
| 52 | goto out; |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 53 | BUG_ON(ret); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 54 | leaf = path->nodes[0]; |
| 55 | item = btrfs_item_ptr(leaf, path->slots[0], |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 56 | struct btrfs_file_extent_item); |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 57 | btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 58 | btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes); |
Sage Weil | f2eb0a2 | 2008-05-02 14:43:14 -0400 | [diff] [blame] | 59 | btrfs_set_file_extent_offset(leaf, item, offset); |
Chris Mason | db94535 | 2007-10-15 16:15:53 -0400 | [diff] [blame] | 60 | btrfs_set_file_extent_num_bytes(leaf, item, num_bytes); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 61 | btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 62 | btrfs_set_file_extent_generation(leaf, item, trans->transid); |
| 63 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); |
Chris Mason | c8b9781 | 2008-10-29 14:49:59 -0400 | [diff] [blame] | 64 | 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 Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 68 | btrfs_mark_buffer_dirty(leaf); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 69 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 70 | btrfs_free_path(path); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 71 | return ret; |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 72 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 73 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 74 | struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
| 75 | struct btrfs_root *root, |
| 76 | struct btrfs_path *path, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 77 | u64 bytenr, int cow) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 78 | { |
| 79 | int ret; |
| 80 | struct btrfs_key file_key; |
| 81 | struct btrfs_key found_key; |
| 82 | struct btrfs_csum_item *item; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 83 | struct extent_buffer *leaf; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 84 | u64 csum_offset = 0; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 85 | u16 csum_size = |
| 86 | btrfs_super_csum_size(&root->fs_info->super_copy); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 87 | int csums_in_item; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 88 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 89 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 90 | file_key.offset = bytenr; |
| 91 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 92 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 93 | if (ret < 0) |
| 94 | goto fail; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 95 | leaf = path->nodes[0]; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 96 | if (ret > 0) { |
| 97 | ret = 1; |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 98 | if (path->slots[0] == 0) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 99 | goto fail; |
| 100 | path->slots[0]--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 101 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 102 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 103 | goto fail; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 104 | |
| 105 | csum_offset = (bytenr - found_key.offset) >> |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 106 | root->fs_info->sb->s_blocksize_bits; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 107 | csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 108 | csums_in_item /= csum_size; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 109 | |
| 110 | if (csum_offset >= csums_in_item) { |
| 111 | ret = -EFBIG; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 112 | goto fail; |
| 113 | } |
| 114 | } |
| 115 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
Chris Mason | 509659c | 2007-05-10 12:36:17 -0400 | [diff] [blame] | 116 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 117 | csum_offset * csum_size); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 118 | return item; |
| 119 | fail: |
| 120 | if (ret > 0) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 121 | ret = -ENOENT; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 122 | return ERR_PTR(ret); |
| 123 | } |
| 124 | |
| 125 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 126 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
| 127 | struct btrfs_root *root, |
| 128 | struct btrfs_path *path, u64 objectid, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 129 | u64 offset, int mod) |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 130 | { |
| 131 | int ret; |
| 132 | struct btrfs_key file_key; |
| 133 | int ins_len = mod < 0 ? -1 : 0; |
| 134 | int cow = mod != 0; |
| 135 | |
| 136 | file_key.objectid = objectid; |
Chris Mason | 70b2bef | 2007-04-17 15:39:32 -0400 | [diff] [blame] | 137 | file_key.offset = offset; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 138 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
| 139 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); |
| 140 | return ret; |
| 141 | } |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 142 | |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 143 | int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 144 | struct bio *bio, u32 *dst) |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 145 | { |
| 146 | u32 sum; |
| 147 | struct bio_vec *bvec = bio->bi_io_vec; |
| 148 | int bio_index = 0; |
| 149 | u64 offset; |
| 150 | u64 item_start_offset = 0; |
| 151 | u64 item_last_offset = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 152 | u64 disk_bytenr; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 153 | u32 diff; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 154 | u16 csum_size = |
| 155 | btrfs_super_csum_size(&root->fs_info->super_copy); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 156 | int ret; |
| 157 | struct btrfs_path *path; |
| 158 | struct btrfs_csum_item *item = NULL; |
| 159 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; |
| 160 | |
| 161 | path = btrfs_alloc_path(); |
Chris Mason | 4d1b5fb | 2008-08-20 09:44:52 -0400 | [diff] [blame] | 162 | if (bio->bi_size > PAGE_CACHE_SIZE * 8) |
| 163 | path->reada = 2; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 164 | |
| 165 | WARN_ON(bio->bi_vcnt <= 0); |
| 166 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 167 | disk_bytenr = (u64)bio->bi_sector << 9; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 168 | while(bio_index < bio->bi_vcnt) { |
| 169 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 170 | ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 171 | if (ret == 0) |
| 172 | goto found; |
| 173 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 174 | if (!item || disk_bytenr < item_start_offset || |
| 175 | disk_bytenr >= item_last_offset) { |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 176 | struct btrfs_key found_key; |
| 177 | u32 item_size; |
| 178 | |
| 179 | if (item) |
| 180 | btrfs_release_path(root, path); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 181 | item = btrfs_lookup_csum(NULL, root->fs_info->csum_root, |
| 182 | path, disk_bytenr, 0); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 183 | if (IS_ERR(item)) { |
| 184 | ret = PTR_ERR(item); |
| 185 | if (ret == -ENOENT || ret == -EFBIG) |
| 186 | ret = 0; |
| 187 | sum = 0; |
| 188 | printk("no csum found for inode %lu start " |
| 189 | "%llu\n", inode->i_ino, |
| 190 | (unsigned long long)offset); |
Chris Mason | 6dab815 | 2008-08-04 08:35:53 -0400 | [diff] [blame] | 191 | item = NULL; |
Chris Mason | 39be25c | 2008-11-10 11:50:50 -0500 | [diff] [blame] | 192 | btrfs_release_path(root, path); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 193 | goto found; |
| 194 | } |
| 195 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, |
| 196 | path->slots[0]); |
| 197 | |
| 198 | item_start_offset = found_key.offset; |
| 199 | item_size = btrfs_item_size_nr(path->nodes[0], |
| 200 | path->slots[0]); |
| 201 | item_last_offset = item_start_offset + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 202 | (item_size / csum_size) * |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 203 | root->sectorsize; |
| 204 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
| 205 | struct btrfs_csum_item); |
| 206 | } |
| 207 | /* |
| 208 | * this byte range must be able to fit inside |
| 209 | * a single leaf so it will also fit inside a u32 |
| 210 | */ |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 211 | diff = disk_bytenr - item_start_offset; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 212 | diff = diff / root->sectorsize; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 213 | diff = diff * csum_size; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 214 | |
| 215 | read_extent_buffer(path->nodes[0], &sum, |
Chris Mason | 3de9d6b | 2008-08-04 23:17:27 -0400 | [diff] [blame] | 216 | ((unsigned long)item) + diff, |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 217 | csum_size); |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 218 | found: |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 219 | if (dst) |
| 220 | *dst++ = sum; |
| 221 | else |
| 222 | set_state_private(io_tree, offset, sum); |
| 223 | disk_bytenr += bvec->bv_len; |
Chris Mason | 61b4944 | 2008-07-31 15:42:53 -0400 | [diff] [blame] | 224 | bio_index++; |
| 225 | bvec++; |
| 226 | } |
| 227 | btrfs_free_path(path); |
| 228 | return 0; |
| 229 | } |
| 230 | |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 231 | int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 232 | struct bio *bio, u64 file_start, int contig) |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 233 | { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 234 | struct btrfs_ordered_sum *sums; |
| 235 | struct btrfs_sector_sum *sector_sum; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 236 | struct btrfs_ordered_extent *ordered; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 237 | char *data; |
| 238 | struct bio_vec *bvec = bio->bi_io_vec; |
| 239 | int bio_index = 0; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 240 | unsigned long total_bytes = 0; |
| 241 | unsigned long this_sum_bytes = 0; |
| 242 | u64 offset; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 243 | u64 disk_bytenr; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 244 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 245 | WARN_ON(bio->bi_vcnt <= 0); |
| 246 | sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS); |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 247 | if (!sums) |
| 248 | return -ENOMEM; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 249 | |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 250 | sector_sum = sums->sums; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 251 | disk_bytenr = (u64)bio->bi_sector << 9; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 252 | sums->len = bio->bi_size; |
| 253 | INIT_LIST_HEAD(&sums->list); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 254 | |
| 255 | if (contig) |
| 256 | offset = file_start; |
| 257 | else |
| 258 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
| 259 | |
| 260 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 261 | BUG_ON(!ordered); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 262 | sums->bytenr = ordered->start; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 263 | |
| 264 | while(bio_index < bio->bi_vcnt) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 265 | if (!contig) |
| 266 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; |
| 267 | |
| 268 | if (!contig && (offset >= ordered->file_offset + ordered->len || |
| 269 | offset < ordered->file_offset)) { |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 270 | unsigned long bytes_left; |
| 271 | sums->len = this_sum_bytes; |
| 272 | this_sum_bytes = 0; |
| 273 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 274 | btrfs_put_ordered_extent(ordered); |
| 275 | |
| 276 | bytes_left = bio->bi_size - total_bytes; |
| 277 | |
| 278 | sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left), |
| 279 | GFP_NOFS); |
| 280 | BUG_ON(!sums); |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 281 | sector_sum = sums->sums; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 282 | sums->len = bytes_left; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 283 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 284 | BUG_ON(!ordered); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 285 | sums->bytenr = ordered->start; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 286 | } |
| 287 | |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 288 | data = kmap_atomic(bvec->bv_page, KM_USER0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 289 | sector_sum->sum = ~(u32)0; |
| 290 | sector_sum->sum = btrfs_csum_data(root, |
| 291 | data + bvec->bv_offset, |
| 292 | sector_sum->sum, |
| 293 | bvec->bv_len); |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 294 | kunmap_atomic(data, KM_USER0); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 295 | btrfs_csum_final(sector_sum->sum, |
| 296 | (char *)§or_sum->sum); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 297 | sector_sum->bytenr = disk_bytenr; |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 298 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 299 | sector_sum++; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 300 | bio_index++; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 301 | total_bytes += bvec->bv_len; |
| 302 | this_sum_bytes += bvec->bv_len; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 303 | disk_bytenr += bvec->bv_len; |
| 304 | offset += bvec->bv_len; |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 305 | bvec++; |
| 306 | } |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 307 | this_sum_bytes = 0; |
Chris Mason | 3edf7d3 | 2008-07-18 06:17:13 -0400 | [diff] [blame] | 308 | btrfs_add_ordered_sum(inode, ordered, sums); |
| 309 | btrfs_put_ordered_extent(ordered); |
Chris Mason | e015640 | 2008-04-16 11:15:20 -0400 | [diff] [blame] | 310 | return 0; |
| 311 | } |
| 312 | |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 313 | int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 314 | struct btrfs_root *root, |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 315 | struct btrfs_ordered_sum *sums) |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 316 | { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 317 | u64 bytenr; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 318 | int ret; |
| 319 | struct btrfs_key file_key; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 320 | struct btrfs_key found_key; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 321 | u64 next_offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 322 | u64 total_bytes = 0; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 323 | int found_next; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 324 | struct btrfs_path *path; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 325 | struct btrfs_csum_item *item; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 326 | struct btrfs_csum_item *item_end; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 327 | struct extent_buffer *leaf = NULL; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 328 | u64 csum_offset; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 329 | struct btrfs_sector_sum *sector_sum; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 330 | u32 nritems; |
| 331 | u32 ins_size; |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 332 | char *eb_map; |
| 333 | char *eb_token; |
| 334 | unsigned long map_len; |
| 335 | unsigned long map_start; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 336 | u16 csum_size = |
| 337 | btrfs_super_csum_size(&root->fs_info->super_copy); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 338 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 339 | path = btrfs_alloc_path(); |
| 340 | BUG_ON(!path); |
Chris Mason | ed98b56 | 2008-07-22 23:06:42 -0400 | [diff] [blame] | 341 | sector_sum = sums->sums; |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 342 | again: |
| 343 | next_offset = (u64)-1; |
| 344 | found_next = 0; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 345 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
| 346 | file_key.offset = sector_sum->bytenr; |
| 347 | bytenr = sector_sum->bytenr; |
| 348 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 349 | |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 350 | item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1); |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 351 | if (!IS_ERR(item)) { |
| 352 | leaf = path->nodes[0]; |
Chris Mason | 639cb58 | 2008-08-28 06:15:25 -0400 | [diff] [blame] | 353 | ret = 0; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 354 | goto found; |
Chris Mason | ff79f81 | 2007-10-15 16:22:25 -0400 | [diff] [blame] | 355 | } |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 356 | ret = PTR_ERR(item); |
| 357 | if (ret == -EFBIG) { |
| 358 | u32 item_size; |
| 359 | /* we found one, but it isn't big enough yet */ |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 360 | leaf = path->nodes[0]; |
| 361 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 362 | if ((item_size / csum_size) >= |
| 363 | MAX_CSUM_ITEMS(root, csum_size)) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 364 | /* already at max size, make a new one */ |
| 365 | goto insert; |
| 366 | } |
| 367 | } else { |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 368 | int slot = path->slots[0] + 1; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 369 | /* we didn't find a csum item, insert one */ |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 370 | nritems = btrfs_header_nritems(path->nodes[0]); |
| 371 | if (path->slots[0] >= nritems - 1) { |
| 372 | ret = btrfs_next_leaf(root, path); |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 373 | if (ret == 1) |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 374 | found_next = 1; |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 375 | if (ret != 0) |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 376 | goto insert; |
Yan | b56baf5 | 2007-10-29 12:01:05 -0400 | [diff] [blame] | 377 | slot = 0; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 378 | } |
| 379 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 380 | if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
| 381 | found_key.type != BTRFS_EXTENT_CSUM_KEY) { |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 382 | found_next = 1; |
| 383 | goto insert; |
| 384 | } |
| 385 | next_offset = found_key.offset; |
| 386 | found_next = 1; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 387 | goto insert; |
| 388 | } |
| 389 | |
| 390 | /* |
| 391 | * at this point, we know the tree has an item, but it isn't big |
| 392 | * enough yet to put our csum in. Grow it |
| 393 | */ |
| 394 | btrfs_release_path(root, path); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 395 | ret = btrfs_search_slot(trans, root, &file_key, path, |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 396 | csum_size, 1); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 397 | if (ret < 0) |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 398 | goto fail_unlock; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 399 | if (ret == 0) { |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 400 | BUG(); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 401 | } |
| 402 | if (path->slots[0] == 0) { |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 403 | goto insert; |
| 404 | } |
| 405 | path->slots[0]--; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 406 | leaf = path->nodes[0]; |
| 407 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 408 | csum_offset = (bytenr - found_key.offset) >> |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 409 | root->fs_info->sb->s_blocksize_bits; |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 410 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY || |
| 411 | found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 412 | csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) { |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 413 | goto insert; |
| 414 | } |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 415 | if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) / |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 416 | csum_size) { |
| 417 | u32 diff = (csum_offset + 1) * csum_size; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 418 | diff = diff - btrfs_item_size_nr(leaf, path->slots[0]); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 419 | if (diff != csum_size) |
Chris Mason | 3a68637 | 2007-05-24 13:35:57 -0400 | [diff] [blame] | 420 | goto insert; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 421 | ret = btrfs_extend_item(trans, root, path, diff); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 422 | BUG_ON(ret); |
| 423 | goto csum; |
| 424 | } |
| 425 | |
| 426 | insert: |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 427 | btrfs_release_path(root, path); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 428 | csum_offset = 0; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 429 | if (found_next) { |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 430 | u64 tmp = total_bytes + root->sectorsize; |
| 431 | u64 next_sector = sector_sum->bytenr; |
| 432 | struct btrfs_sector_sum *next = sector_sum + 1; |
| 433 | |
| 434 | while(tmp < sums->len) { |
| 435 | if (next_sector + root->sectorsize != next->bytenr) |
| 436 | break; |
| 437 | tmp += root->sectorsize; |
| 438 | next_sector = next->bytenr; |
| 439 | next++; |
| 440 | } |
| 441 | tmp = min(tmp, next_offset - file_key.offset); |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 442 | tmp >>= root->fs_info->sb->s_blocksize_bits; |
| 443 | tmp = max((u64)1, tmp); |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 444 | tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size)); |
| 445 | ins_size = csum_size * tmp; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 446 | } else { |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 447 | ins_size = csum_size; |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 448 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 449 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | f578d4b | 2007-10-25 15:42:56 -0400 | [diff] [blame] | 450 | ins_size); |
Chris Mason | 54aa1f4 | 2007-06-22 14:16:25 -0400 | [diff] [blame] | 451 | if (ret < 0) |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 452 | goto fail_unlock; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 453 | if (ret != 0) { |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 454 | WARN_ON(1); |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 455 | goto fail_unlock; |
Chris Mason | a429e51 | 2007-04-18 16:15:28 -0400 | [diff] [blame] | 456 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 457 | csum: |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 458 | leaf = path->nodes[0]; |
| 459 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 460 | ret = 0; |
Chris Mason | 509659c | 2007-05-10 12:36:17 -0400 | [diff] [blame] | 461 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 462 | csum_offset * csum_size); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame] | 463 | found: |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 464 | item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
| 465 | item_end = (struct btrfs_csum_item *)((unsigned char *)item_end + |
| 466 | btrfs_item_size_nr(leaf, path->slots[0])); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 467 | eb_token = NULL; |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 468 | cond_resched(); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 469 | next_sector: |
Chris Mason | aadfeb6 | 2008-01-29 09:10:27 -0500 | [diff] [blame] | 470 | |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 471 | if (!eb_token || |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 472 | (unsigned long)item + csum_size >= map_start + map_len) { |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 473 | int err; |
| 474 | |
| 475 | if (eb_token) |
Chris Mason | eb20978 | 2008-02-21 09:30:08 -0500 | [diff] [blame] | 476 | unmap_extent_buffer(leaf, eb_token, KM_USER1); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 477 | eb_token = NULL; |
| 478 | err = map_private_extent_buffer(leaf, (unsigned long)item, |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 479 | csum_size, |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 480 | &eb_token, &eb_map, |
Chris Mason | eb20978 | 2008-02-21 09:30:08 -0500 | [diff] [blame] | 481 | &map_start, &map_len, KM_USER1); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 482 | if (err) |
| 483 | eb_token = NULL; |
| 484 | } |
| 485 | if (eb_token) { |
| 486 | memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)), |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 487 | §or_sum->sum, csum_size); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 488 | } else { |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 489 | write_extent_buffer(leaf, §or_sum->sum, |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 490 | (unsigned long)item, csum_size); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 491 | } |
Chris Mason | 7f3c74f | 2008-07-18 12:01:11 -0400 | [diff] [blame] | 492 | |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 493 | total_bytes += root->sectorsize; |
| 494 | sector_sum++; |
| 495 | if (total_bytes < sums->len) { |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 496 | item = (struct btrfs_csum_item *)((char *)item + |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 497 | csum_size); |
Chris Mason | d20f704 | 2008-12-08 16:58:54 -0500 | [diff] [blame^] | 498 | if (item < item_end && bytenr + PAGE_CACHE_SIZE == |
| 499 | sector_sum->bytenr) { |
| 500 | bytenr = sector_sum->bytenr; |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 501 | goto next_sector; |
Chris Mason | 2e1a992 | 2008-02-20 15:44:32 -0500 | [diff] [blame] | 502 | } |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 503 | } |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 504 | if (eb_token) { |
Chris Mason | eb20978 | 2008-02-21 09:30:08 -0500 | [diff] [blame] | 505 | unmap_extent_buffer(leaf, eb_token, KM_USER1); |
Chris Mason | 6e92f5e | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 506 | eb_token = NULL; |
| 507 | } |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 508 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 509 | cond_resched(); |
Chris Mason | e6dcd2d | 2008-07-17 12:53:50 -0400 | [diff] [blame] | 510 | if (total_bytes < sums->len) { |
Chris Mason | 065631f | 2008-02-20 12:07:25 -0500 | [diff] [blame] | 511 | btrfs_release_path(root, path); |
| 512 | goto again; |
| 513 | } |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 514 | out: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 515 | btrfs_free_path(path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 516 | return ret; |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 517 | |
| 518 | fail_unlock: |
Chris Mason | 5386323 | 2008-08-15 15:34:18 -0400 | [diff] [blame] | 519 | goto out; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 520 | } |
| 521 | |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 522 | int btrfs_csum_truncate(struct btrfs_trans_handle *trans, |
| 523 | struct btrfs_root *root, struct btrfs_path *path, |
| 524 | u64 isize) |
| 525 | { |
| 526 | struct btrfs_key key; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 527 | struct extent_buffer *leaf = path->nodes[0]; |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 528 | int slot = path->slots[0]; |
| 529 | int ret; |
| 530 | u32 new_item_size; |
| 531 | u64 new_item_span; |
| 532 | u64 blocks; |
| 533 | |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 534 | btrfs_item_key_to_cpu(leaf, &key, slot); |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 535 | if (isize <= key.offset) |
| 536 | return 0; |
| 537 | new_item_span = isize - key.offset; |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 538 | blocks = (new_item_span + root->sectorsize - 1) >> |
Chris Mason | 84f54cf | 2007-06-12 07:43:08 -0400 | [diff] [blame] | 539 | root->fs_info->sb->s_blocksize_bits; |
Josef Bacik | 607d432 | 2008-12-02 07:17:45 -0500 | [diff] [blame] | 540 | new_item_size = blocks * |
| 541 | btrfs_super_csum_size(&root->fs_info->super_copy); |
Chris Mason | 5f39d39 | 2007-10-15 16:14:19 -0400 | [diff] [blame] | 542 | if (new_item_size >= btrfs_item_size_nr(leaf, slot)) |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 543 | return 0; |
Chris Mason | 179e29e | 2007-11-01 11:28:41 -0400 | [diff] [blame] | 544 | ret = btrfs_truncate_item(trans, root, path, new_item_size, 1); |
Chris Mason | 1de037a | 2007-05-29 15:17:08 -0400 | [diff] [blame] | 545 | BUG_ON(ret); |
| 546 | return ret; |
| 547 | } |