Chris Mason | 2e635a2 | 2007-03-21 11:12:56 -0400 | [diff] [blame] | 1 | #include <linux/module.h> |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 2 | #include "ctree.h" |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 3 | #include "disk-io.h" |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 4 | #include "transaction.h" |
Chris Mason | 1e1d270 | 2007-03-15 19:03:33 -0400 | [diff] [blame] | 5 | |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 6 | #define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \ |
| 7 | sizeof(struct btrfs_item)) / \ |
| 8 | sizeof(struct btrfs_csum_item)) - 1)) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 9 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 10 | struct btrfs_root *root, |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 11 | u64 objectid, u64 pos, |
| 12 | u64 offset, u64 num_blocks) |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 13 | { |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 14 | int ret = 0; |
| 15 | struct btrfs_file_extent_item *item; |
| 16 | struct btrfs_key file_key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 17 | struct btrfs_path *path; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 18 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 19 | path = btrfs_alloc_path(); |
| 20 | BUG_ON(!path); |
| 21 | btrfs_init_path(path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 22 | /* |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 23 | ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block, |
Chris Mason | d0dbc624 | 2007-04-10 12:36:36 -0400 | [diff] [blame] | 24 | (u64)-1, &ins); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 25 | */ |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 26 | BUG_ON(ret); |
| 27 | file_key.objectid = objectid; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 28 | file_key.offset = pos; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 29 | file_key.flags = 0; |
| 30 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
| 31 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 32 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 33 | sizeof(*item)); |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 34 | BUG_ON(ret); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 35 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 36 | struct btrfs_file_extent_item); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 37 | btrfs_set_file_extent_disk_blocknr(item, offset); |
| 38 | btrfs_set_file_extent_disk_num_blocks(item, num_blocks); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 39 | btrfs_set_file_extent_offset(item, 0); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 40 | btrfs_set_file_extent_num_blocks(item, num_blocks); |
Chris Mason | 71951f3 | 2007-03-27 09:16:29 -0400 | [diff] [blame] | 41 | btrfs_set_file_extent_generation(item, trans->transid); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 42 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 43 | btrfs_release_path(root, path); |
| 44 | btrfs_free_path(path); |
Chris Mason | 9f5fae2 | 2007-03-20 14:38:32 -0400 | [diff] [blame] | 45 | return 0; |
| 46 | } |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 47 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 48 | struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
| 49 | struct btrfs_root *root, |
| 50 | struct btrfs_path *path, |
| 51 | u64 objectid, u64 offset, |
| 52 | int cow) |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 53 | { |
| 54 | int ret; |
| 55 | struct btrfs_key file_key; |
| 56 | struct btrfs_key found_key; |
| 57 | struct btrfs_csum_item *item; |
| 58 | struct btrfs_leaf *leaf; |
| 59 | u64 csum_offset = 0; |
| 60 | |
| 61 | file_key.objectid = objectid; |
| 62 | file_key.offset = offset; |
| 63 | file_key.flags = 0; |
| 64 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 65 | printk("__lookup for %Lu\n", offset); |
| 66 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 67 | if (ret < 0) |
| 68 | goto fail; |
| 69 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 70 | if (ret > 0) { |
| 71 | ret = 1; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 72 | if (path->slots[0] == 0) { |
| 73 | printk("fail1\n"); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 74 | goto fail; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 75 | } |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 76 | path->slots[0]--; |
| 77 | btrfs_disk_key_to_cpu(&found_key, |
| 78 | &leaf->items[path->slots[0]].key); |
| 79 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || |
| 80 | found_key.objectid != objectid) { |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 81 | printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid, objectid); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 82 | goto fail; |
| 83 | } |
| 84 | csum_offset = (offset - found_key.offset) >> |
| 85 | root->fs_info->sb->s_blocksize_bits; |
| 86 | if (csum_offset >= |
| 87 | btrfs_item_size(leaf->items + path->slots[0]) / |
| 88 | sizeof(struct btrfs_csum_item)) { |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 89 | printk("fail3, csum offset %lu size %u\n", csum_offset, btrfs_item_size(leaf->items + path->slots[0]) / sizeof(struct btrfs_csum_item)); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 90 | goto fail; |
| 91 | } |
| 92 | } |
| 93 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
| 94 | item += csum_offset; |
| 95 | return item; |
| 96 | fail: |
| 97 | if (ret > 0) |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 98 | ret = -ENOENT; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 99 | return ERR_PTR(ret); |
| 100 | } |
| 101 | |
| 102 | |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 103 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
| 104 | struct btrfs_root *root, |
| 105 | struct btrfs_path *path, u64 objectid, |
Chris Mason | 9773a78 | 2007-03-27 11:26:26 -0400 | [diff] [blame] | 106 | u64 offset, int mod) |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 107 | { |
| 108 | int ret; |
| 109 | struct btrfs_key file_key; |
| 110 | int ins_len = mod < 0 ? -1 : 0; |
| 111 | int cow = mod != 0; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 112 | struct btrfs_csum_item *csum_item; |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 113 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 114 | csum_item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 115 | if (IS_ERR(csum_item)) |
| 116 | return PTR_ERR(csum_item); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 117 | file_key.objectid = objectid; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 118 | file_key.offset = btrfs_csum_extent_offset(csum_item); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 119 | file_key.flags = 0; |
| 120 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 121 | btrfs_release_path(root, path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 122 | printk("lookup file extent searches for %Lu\n", file_key.offset); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 123 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 124 | printk("ret is %d\n", ret); |
Chris Mason | dee26a9 | 2007-03-26 16:00:06 -0400 | [diff] [blame] | 125 | return ret; |
| 126 | } |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 127 | |
| 128 | int btrfs_csum_file_block(struct btrfs_trans_handle *trans, |
| 129 | struct btrfs_root *root, |
| 130 | u64 objectid, u64 offset, |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 131 | u64 extent_offset, |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 132 | char *data, size_t len) |
| 133 | { |
| 134 | int ret; |
| 135 | struct btrfs_key file_key; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 136 | struct btrfs_key found_key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 137 | struct btrfs_path *path; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 138 | struct btrfs_csum_item *item; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 139 | struct btrfs_leaf *leaf; |
| 140 | u64 csum_offset; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 141 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 142 | path = btrfs_alloc_path(); |
| 143 | BUG_ON(!path); |
| 144 | btrfs_init_path(path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 145 | |
| 146 | item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0); |
| 147 | if (!IS_ERR(item)) |
| 148 | goto found; |
| 149 | btrfs_release_path(root, path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 150 | file_key.objectid = objectid; |
| 151 | file_key.offset = offset; |
| 152 | file_key.flags = 0; |
| 153 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 154 | printk("searching for csum %Lu %Lu\n", objectid, offset); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 155 | ret = btrfs_search_slot(trans, root, &file_key, path, |
| 156 | sizeof(struct btrfs_csum_item), 1); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 157 | printk("ret %d\n", ret); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 158 | if (ret < 0) |
| 159 | goto fail; |
| 160 | if (ret == 0) { |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 161 | BUG(); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 162 | } |
| 163 | if (path->slots[0] == 0) { |
| 164 | btrfs_release_path(root, path); |
| 165 | goto insert; |
| 166 | } |
| 167 | path->slots[0]--; |
| 168 | leaf = btrfs_buffer_leaf(path->nodes[0]); |
| 169 | btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 170 | printk("found key %Lu %Lu %u\n", found_key.objectid, found_key.offset, found_key.flags); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 171 | csum_offset = (offset - found_key.offset) >> |
| 172 | root->fs_info->sb->s_blocksize_bits; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 173 | printk("csum_offset %Lu\n", csum_offset); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 174 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || |
| 175 | found_key.objectid != objectid || |
| 176 | csum_offset >= MAX_CSUM_ITEMS(root)) { |
| 177 | btrfs_release_path(root, path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 178 | printk("insert1\n"); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 179 | goto insert; |
| 180 | } |
| 181 | if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) / |
| 182 | sizeof(struct btrfs_csum_item)) { |
| 183 | ret = btrfs_extend_item(trans, root, path, |
| 184 | sizeof(struct btrfs_csum_item)); |
| 185 | BUG_ON(ret); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 186 | printk("item extended\n"); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 187 | goto csum; |
| 188 | } |
| 189 | |
| 190 | insert: |
| 191 | csum_offset = 0; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 192 | printk("inserting item %Lu %Lu %u\n", file_key.objectid, file_key.offset, file_key.flags); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 193 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 194 | sizeof(struct btrfs_csum_item)); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 195 | if (ret != 0 && ret != -EEXIST) |
| 196 | goto fail; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 197 | csum: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 198 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 199 | struct btrfs_csum_item); |
| 200 | ret = 0; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 201 | item += csum_offset; |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 202 | found: |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 203 | ret = btrfs_csum_data(root, data, len, item->csum); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 204 | btrfs_set_csum_extent_offset(item, extent_offset); |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 205 | btrfs_mark_buffer_dirty(path->nodes[0]); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 206 | fail: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 207 | btrfs_release_path(root, path); |
| 208 | btrfs_free_path(path); |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 209 | printk("return ret %d\n", ret); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 210 | return ret; |
| 211 | } |
| 212 | |
| 213 | int btrfs_csum_verify_file_block(struct btrfs_root *root, |
| 214 | u64 objectid, u64 offset, |
| 215 | char *data, size_t len) |
| 216 | { |
| 217 | int ret; |
| 218 | struct btrfs_key file_key; |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 219 | struct btrfs_path *path; |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 220 | struct btrfs_csum_item *item; |
| 221 | char result[BTRFS_CSUM_SIZE]; |
| 222 | |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 223 | path = btrfs_alloc_path(); |
| 224 | BUG_ON(!path); |
| 225 | btrfs_init_path(path); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 226 | file_key.objectid = objectid; |
| 227 | file_key.offset = offset; |
| 228 | file_key.flags = 0; |
| 229 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); |
Chris Mason | 2da566e | 2007-04-02 15:43:21 -0400 | [diff] [blame] | 230 | mutex_lock(&root->fs_info->fs_mutex); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 231 | |
Chris Mason | b18c668 | 2007-04-17 13:26:50 -0400 | [diff] [blame^] | 232 | item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0); |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 233 | if (IS_ERR(item)) { |
| 234 | ret = PTR_ERR(item); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 235 | goto fail; |
Chris Mason | 6567e83 | 2007-04-16 09:22:45 -0400 | [diff] [blame] | 236 | } |
| 237 | |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 238 | ret = btrfs_csum_data(root, data, len, result); |
| 239 | WARN_ON(ret); |
| 240 | if (memcmp(result, item->csum, BTRFS_CSUM_SIZE)) |
| 241 | ret = 1; |
| 242 | fail: |
Chris Mason | 5caf2a0 | 2007-04-02 11:20:42 -0400 | [diff] [blame] | 243 | btrfs_release_path(root, path); |
| 244 | btrfs_free_path(path); |
Chris Mason | 2da566e | 2007-04-02 15:43:21 -0400 | [diff] [blame] | 245 | mutex_unlock(&root->fs_info->fs_mutex); |
Chris Mason | f254e52 | 2007-03-29 15:15:27 -0400 | [diff] [blame] | 246 | return ret; |
| 247 | } |
| 248 | |