Commit | Line | Data |
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2e635a27 | 1 | #include <linux/module.h> |
1e1d2701 | 2 | #include "ctree.h" |
dee26a9f | 3 | #include "disk-io.h" |
9f5fae2f | 4 | #include "transaction.h" |
1e1d2701 | 5 | |
6567e837 CM |
6 | #define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \ |
7 | sizeof(struct btrfs_item)) / \ | |
8 | sizeof(struct btrfs_csum_item)) - 1)) | |
b18c6685 | 9 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
dee26a9f | 10 | struct btrfs_root *root, |
b18c6685 CM |
11 | u64 objectid, u64 pos, |
12 | u64 offset, u64 num_blocks) | |
9f5fae2f | 13 | { |
dee26a9f CM |
14 | int ret = 0; |
15 | struct btrfs_file_extent_item *item; | |
16 | struct btrfs_key file_key; | |
5caf2a00 | 17 | struct btrfs_path *path; |
dee26a9f | 18 | |
5caf2a00 CM |
19 | path = btrfs_alloc_path(); |
20 | BUG_ON(!path); | |
21 | btrfs_init_path(path); | |
b18c6685 | 22 | /* |
dee26a9f | 23 | ret = btrfs_alloc_extent(trans, root, num_blocks, hint_block, |
d0dbc624 | 24 | (u64)-1, &ins); |
b18c6685 | 25 | */ |
dee26a9f CM |
26 | BUG_ON(ret); |
27 | file_key.objectid = objectid; | |
b18c6685 | 28 | file_key.offset = pos; |
dee26a9f CM |
29 | file_key.flags = 0; |
30 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); | |
31 | ||
5caf2a00 | 32 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
dee26a9f | 33 | sizeof(*item)); |
9773a788 | 34 | BUG_ON(ret); |
5caf2a00 | 35 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 36 | struct btrfs_file_extent_item); |
b18c6685 CM |
37 | btrfs_set_file_extent_disk_blocknr(item, offset); |
38 | btrfs_set_file_extent_disk_num_blocks(item, num_blocks); | |
dee26a9f | 39 | btrfs_set_file_extent_offset(item, 0); |
b18c6685 | 40 | btrfs_set_file_extent_num_blocks(item, num_blocks); |
71951f35 | 41 | btrfs_set_file_extent_generation(item, trans->transid); |
5caf2a00 | 42 | btrfs_mark_buffer_dirty(path->nodes[0]); |
5caf2a00 CM |
43 | btrfs_release_path(root, path); |
44 | btrfs_free_path(path); | |
9f5fae2f CM |
45 | return 0; |
46 | } | |
dee26a9f | 47 | |
b18c6685 CM |
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) | |
6567e837 CM |
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); | |
b18c6685 CM |
65 | printk("__lookup for %Lu\n", offset); |
66 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); | |
6567e837 CM |
67 | if (ret < 0) |
68 | goto fail; | |
69 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
70 | if (ret > 0) { | |
71 | ret = 1; | |
b18c6685 CM |
72 | if (path->slots[0] == 0) { |
73 | printk("fail1\n"); | |
6567e837 | 74 | goto fail; |
b18c6685 | 75 | } |
6567e837 CM |
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) { | |
b18c6685 | 81 | printk("fail2 type %u %Lu %Lu\n", btrfs_key_type(&found_key), found_key.objectid, objectid); |
6567e837 CM |
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)) { | |
b18c6685 | 89 | printk("fail3, csum offset %lu size %u\n", csum_offset, btrfs_item_size(leaf->items + path->slots[0]) / sizeof(struct btrfs_csum_item)); |
6567e837 CM |
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) | |
b18c6685 | 98 | ret = -ENOENT; |
6567e837 CM |
99 | return ERR_PTR(ret); |
100 | } | |
101 | ||
102 | ||
dee26a9f CM |
103 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
104 | struct btrfs_root *root, | |
105 | struct btrfs_path *path, u64 objectid, | |
9773a788 | 106 | u64 offset, int mod) |
dee26a9f CM |
107 | { |
108 | int ret; | |
109 | struct btrfs_key file_key; | |
110 | int ins_len = mod < 0 ? -1 : 0; | |
111 | int cow = mod != 0; | |
6567e837 | 112 | struct btrfs_csum_item *csum_item; |
dee26a9f | 113 | |
b18c6685 | 114 | csum_item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0); |
6567e837 CM |
115 | if (IS_ERR(csum_item)) |
116 | return PTR_ERR(csum_item); | |
dee26a9f | 117 | file_key.objectid = objectid; |
6567e837 | 118 | file_key.offset = btrfs_csum_extent_offset(csum_item); |
dee26a9f CM |
119 | file_key.flags = 0; |
120 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); | |
6567e837 | 121 | btrfs_release_path(root, path); |
b18c6685 | 122 | printk("lookup file extent searches for %Lu\n", file_key.offset); |
dee26a9f | 123 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); |
b18c6685 | 124 | printk("ret is %d\n", ret); |
dee26a9f CM |
125 | return ret; |
126 | } | |
f254e52c CM |
127 | |
128 | int btrfs_csum_file_block(struct btrfs_trans_handle *trans, | |
129 | struct btrfs_root *root, | |
130 | u64 objectid, u64 offset, | |
6567e837 | 131 | u64 extent_offset, |
f254e52c CM |
132 | char *data, size_t len) |
133 | { | |
134 | int ret; | |
135 | struct btrfs_key file_key; | |
6567e837 | 136 | struct btrfs_key found_key; |
5caf2a00 | 137 | struct btrfs_path *path; |
f254e52c | 138 | struct btrfs_csum_item *item; |
6567e837 CM |
139 | struct btrfs_leaf *leaf; |
140 | u64 csum_offset; | |
f254e52c | 141 | |
5caf2a00 CM |
142 | path = btrfs_alloc_path(); |
143 | BUG_ON(!path); | |
144 | btrfs_init_path(path); | |
b18c6685 CM |
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); | |
f254e52c CM |
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); | |
b18c6685 | 154 | printk("searching for csum %Lu %Lu\n", objectid, offset); |
6567e837 CM |
155 | ret = btrfs_search_slot(trans, root, &file_key, path, |
156 | sizeof(struct btrfs_csum_item), 1); | |
b18c6685 | 157 | printk("ret %d\n", ret); |
6567e837 CM |
158 | if (ret < 0) |
159 | goto fail; | |
160 | if (ret == 0) { | |
b18c6685 | 161 | BUG(); |
6567e837 CM |
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); | |
b18c6685 | 170 | printk("found key %Lu %Lu %u\n", found_key.objectid, found_key.offset, found_key.flags); |
6567e837 CM |
171 | csum_offset = (offset - found_key.offset) >> |
172 | root->fs_info->sb->s_blocksize_bits; | |
b18c6685 | 173 | printk("csum_offset %Lu\n", csum_offset); |
6567e837 CM |
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); | |
b18c6685 | 178 | printk("insert1\n"); |
6567e837 CM |
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); | |
b18c6685 | 186 | printk("item extended\n"); |
6567e837 CM |
187 | goto csum; |
188 | } | |
189 | ||
190 | insert: | |
191 | csum_offset = 0; | |
b18c6685 | 192 | printk("inserting item %Lu %Lu %u\n", file_key.objectid, file_key.offset, file_key.flags); |
5caf2a00 | 193 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
6567e837 | 194 | sizeof(struct btrfs_csum_item)); |
f254e52c CM |
195 | if (ret != 0 && ret != -EEXIST) |
196 | goto fail; | |
6567e837 | 197 | csum: |
5caf2a00 | 198 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
f254e52c CM |
199 | struct btrfs_csum_item); |
200 | ret = 0; | |
6567e837 | 201 | item += csum_offset; |
b18c6685 | 202 | found: |
f254e52c | 203 | ret = btrfs_csum_data(root, data, len, item->csum); |
6567e837 | 204 | btrfs_set_csum_extent_offset(item, extent_offset); |
5caf2a00 | 205 | btrfs_mark_buffer_dirty(path->nodes[0]); |
f254e52c | 206 | fail: |
5caf2a00 CM |
207 | btrfs_release_path(root, path); |
208 | btrfs_free_path(path); | |
b18c6685 | 209 | printk("return ret %d\n", ret); |
f254e52c CM |
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; | |
5caf2a00 | 219 | struct btrfs_path *path; |
f254e52c CM |
220 | struct btrfs_csum_item *item; |
221 | char result[BTRFS_CSUM_SIZE]; | |
222 | ||
5caf2a00 CM |
223 | path = btrfs_alloc_path(); |
224 | BUG_ON(!path); | |
225 | btrfs_init_path(path); | |
f254e52c CM |
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); | |
2da566ed | 230 | mutex_lock(&root->fs_info->fs_mutex); |
6567e837 | 231 | |
b18c6685 | 232 | item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0); |
6567e837 CM |
233 | if (IS_ERR(item)) { |
234 | ret = PTR_ERR(item); | |
f254e52c | 235 | goto fail; |
6567e837 CM |
236 | } |
237 | ||
f254e52c CM |
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: | |
5caf2a00 CM |
243 | btrfs_release_path(root, path); |
244 | btrfs_free_path(path); | |
2da566ed | 245 | mutex_unlock(&root->fs_info->fs_mutex); |
f254e52c CM |
246 | return ret; |
247 | } | |
248 |