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 | 6 | #define MAX_CSUM_ITEMS(r) ((((BTRFS_LEAF_DATA_SIZE(r) - \ |
509659cd CM |
7 | sizeof(struct btrfs_item) * 2) / \ |
8 | BTRFS_CRC32_SIZE) - 1)) | |
b18c6685 | 9 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
dee26a9f | 10 | struct btrfs_root *root, |
b18c6685 | 11 | u64 objectid, u64 pos, |
3a686375 CM |
12 | u64 offset, u64 disk_num_blocks, |
13 | u64 num_blocks) | |
9f5fae2f | 14 | { |
dee26a9f CM |
15 | int ret = 0; |
16 | struct btrfs_file_extent_item *item; | |
17 | struct btrfs_key file_key; | |
5caf2a00 | 18 | struct btrfs_path *path; |
dee26a9f | 19 | |
5caf2a00 CM |
20 | path = btrfs_alloc_path(); |
21 | BUG_ON(!path); | |
22 | btrfs_init_path(path); | |
dee26a9f | 23 | file_key.objectid = objectid; |
b18c6685 | 24 | file_key.offset = pos; |
dee26a9f CM |
25 | file_key.flags = 0; |
26 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); | |
27 | ||
5caf2a00 | 28 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
dee26a9f | 29 | sizeof(*item)); |
9773a788 | 30 | BUG_ON(ret); |
5caf2a00 | 31 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
dee26a9f | 32 | struct btrfs_file_extent_item); |
b18c6685 | 33 | btrfs_set_file_extent_disk_blocknr(item, offset); |
3a686375 | 34 | btrfs_set_file_extent_disk_num_blocks(item, disk_num_blocks); |
dee26a9f | 35 | btrfs_set_file_extent_offset(item, 0); |
b18c6685 | 36 | btrfs_set_file_extent_num_blocks(item, num_blocks); |
71951f35 | 37 | btrfs_set_file_extent_generation(item, trans->transid); |
236454df | 38 | btrfs_set_file_extent_type(item, BTRFS_FILE_EXTENT_REG); |
5caf2a00 | 39 | btrfs_mark_buffer_dirty(path->nodes[0]); |
a429e513 | 40 | |
5caf2a00 CM |
41 | btrfs_release_path(root, path); |
42 | btrfs_free_path(path); | |
9f5fae2f CM |
43 | return 0; |
44 | } | |
dee26a9f | 45 | |
b18c6685 CM |
46 | struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
47 | struct btrfs_root *root, | |
48 | struct btrfs_path *path, | |
49 | u64 objectid, u64 offset, | |
50 | int cow) | |
6567e837 CM |
51 | { |
52 | int ret; | |
53 | struct btrfs_key file_key; | |
54 | struct btrfs_key found_key; | |
55 | struct btrfs_csum_item *item; | |
56 | struct btrfs_leaf *leaf; | |
57 | u64 csum_offset = 0; | |
a429e513 | 58 | int csums_in_item; |
6567e837 CM |
59 | |
60 | file_key.objectid = objectid; | |
61 | file_key.offset = offset; | |
62 | file_key.flags = 0; | |
63 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); | |
b18c6685 | 64 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
6567e837 CM |
65 | if (ret < 0) |
66 | goto fail; | |
67 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
68 | if (ret > 0) { | |
69 | ret = 1; | |
70b2befd | 70 | if (path->slots[0] == 0) |
6567e837 CM |
71 | goto fail; |
72 | path->slots[0]--; | |
73 | btrfs_disk_key_to_cpu(&found_key, | |
74 | &leaf->items[path->slots[0]].key); | |
75 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || | |
76 | found_key.objectid != objectid) { | |
77 | goto fail; | |
78 | } | |
79 | csum_offset = (offset - found_key.offset) >> | |
80 | root->fs_info->sb->s_blocksize_bits; | |
a429e513 | 81 | csums_in_item = btrfs_item_size(leaf->items + path->slots[0]); |
509659cd | 82 | csums_in_item /= BTRFS_CRC32_SIZE; |
a429e513 CM |
83 | |
84 | if (csum_offset >= csums_in_item) { | |
85 | ret = -EFBIG; | |
6567e837 CM |
86 | goto fail; |
87 | } | |
88 | } | |
89 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); | |
509659cd CM |
90 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
91 | csum_offset * BTRFS_CRC32_SIZE); | |
6567e837 CM |
92 | return item; |
93 | fail: | |
94 | if (ret > 0) | |
b18c6685 | 95 | ret = -ENOENT; |
6567e837 CM |
96 | return ERR_PTR(ret); |
97 | } | |
98 | ||
99 | ||
dee26a9f CM |
100 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
101 | struct btrfs_root *root, | |
102 | struct btrfs_path *path, u64 objectid, | |
9773a788 | 103 | u64 offset, int mod) |
dee26a9f CM |
104 | { |
105 | int ret; | |
106 | struct btrfs_key file_key; | |
107 | int ins_len = mod < 0 ? -1 : 0; | |
108 | int cow = mod != 0; | |
109 | ||
110 | file_key.objectid = objectid; | |
70b2befd | 111 | file_key.offset = offset; |
dee26a9f CM |
112 | file_key.flags = 0; |
113 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); | |
114 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); | |
115 | return ret; | |
116 | } | |
f254e52c CM |
117 | |
118 | int btrfs_csum_file_block(struct btrfs_trans_handle *trans, | |
119 | struct btrfs_root *root, | |
120 | u64 objectid, u64 offset, | |
121 | char *data, size_t len) | |
122 | { | |
123 | int ret; | |
124 | struct btrfs_key file_key; | |
6567e837 | 125 | struct btrfs_key found_key; |
5caf2a00 | 126 | struct btrfs_path *path; |
f254e52c | 127 | struct btrfs_csum_item *item; |
6567e837 CM |
128 | struct btrfs_leaf *leaf; |
129 | u64 csum_offset; | |
f254e52c | 130 | |
5caf2a00 CM |
131 | path = btrfs_alloc_path(); |
132 | BUG_ON(!path); | |
b18c6685 | 133 | |
f254e52c CM |
134 | file_key.objectid = objectid; |
135 | file_key.offset = offset; | |
136 | file_key.flags = 0; | |
137 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); | |
a429e513 CM |
138 | |
139 | item = btrfs_lookup_csum(trans, root, path, objectid, offset, 1); | |
140 | if (!IS_ERR(item)) | |
141 | goto found; | |
142 | ret = PTR_ERR(item); | |
143 | if (ret == -EFBIG) { | |
144 | u32 item_size; | |
145 | /* we found one, but it isn't big enough yet */ | |
146 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
147 | item_size = btrfs_item_size(leaf->items + path->slots[0]); | |
509659cd | 148 | if ((item_size / BTRFS_CRC32_SIZE) >= MAX_CSUM_ITEMS(root)) { |
a429e513 CM |
149 | /* already at max size, make a new one */ |
150 | goto insert; | |
151 | } | |
152 | } else { | |
153 | /* we didn't find a csum item, insert one */ | |
154 | goto insert; | |
155 | } | |
156 | ||
157 | /* | |
158 | * at this point, we know the tree has an item, but it isn't big | |
159 | * enough yet to put our csum in. Grow it | |
160 | */ | |
161 | btrfs_release_path(root, path); | |
6567e837 | 162 | ret = btrfs_search_slot(trans, root, &file_key, path, |
509659cd | 163 | BTRFS_CRC32_SIZE, 1); |
6567e837 CM |
164 | if (ret < 0) |
165 | goto fail; | |
166 | if (ret == 0) { | |
b18c6685 | 167 | BUG(); |
6567e837 CM |
168 | } |
169 | if (path->slots[0] == 0) { | |
6567e837 CM |
170 | goto insert; |
171 | } | |
172 | path->slots[0]--; | |
173 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
174 | btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key); | |
175 | csum_offset = (offset - found_key.offset) >> | |
176 | root->fs_info->sb->s_blocksize_bits; | |
177 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || | |
178 | found_key.objectid != objectid || | |
179 | csum_offset >= MAX_CSUM_ITEMS(root)) { | |
6567e837 CM |
180 | goto insert; |
181 | } | |
182 | if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) / | |
509659cd CM |
183 | BTRFS_CRC32_SIZE) { |
184 | u32 diff = (csum_offset + 1) * BTRFS_CRC32_SIZE; | |
a429e513 | 185 | diff = diff - btrfs_item_size(leaf->items + path->slots[0]); |
3a686375 CM |
186 | if (diff != BTRFS_CRC32_SIZE) |
187 | goto insert; | |
a429e513 | 188 | ret = btrfs_extend_item(trans, root, path, diff); |
6567e837 CM |
189 | BUG_ON(ret); |
190 | goto csum; | |
191 | } | |
192 | ||
193 | insert: | |
a429e513 | 194 | btrfs_release_path(root, path); |
6567e837 | 195 | csum_offset = 0; |
5caf2a00 | 196 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
509659cd | 197 | BTRFS_CRC32_SIZE); |
a429e513 CM |
198 | if (ret != 0) { |
199 | printk("at insert for %Lu %u %Lu ret is %d\n", file_key.objectid, file_key.flags, file_key.offset, ret); | |
200 | WARN_ON(1); | |
f254e52c | 201 | goto fail; |
a429e513 | 202 | } |
6567e837 | 203 | csum: |
5caf2a00 | 204 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
f254e52c CM |
205 | struct btrfs_csum_item); |
206 | ret = 0; | |
509659cd CM |
207 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
208 | csum_offset * BTRFS_CRC32_SIZE); | |
b18c6685 | 209 | found: |
509659cd CM |
210 | btrfs_check_bounds(&item->csum, BTRFS_CRC32_SIZE, |
211 | path->nodes[0]->b_data, | |
212 | root->fs_info->sb->s_blocksize); | |
213 | ret = btrfs_csum_data(root, data, len, &item->csum); | |
5caf2a00 | 214 | btrfs_mark_buffer_dirty(path->nodes[0]); |
f254e52c | 215 | fail: |
5caf2a00 CM |
216 | btrfs_release_path(root, path); |
217 | btrfs_free_path(path); | |
f254e52c CM |
218 | return ret; |
219 | } | |
220 | ||
221 | int btrfs_csum_verify_file_block(struct btrfs_root *root, | |
222 | u64 objectid, u64 offset, | |
223 | char *data, size_t len) | |
224 | { | |
225 | int ret; | |
226 | struct btrfs_key file_key; | |
5caf2a00 | 227 | struct btrfs_path *path; |
f254e52c | 228 | struct btrfs_csum_item *item; |
509659cd | 229 | char result[BTRFS_CRC32_SIZE]; |
f254e52c | 230 | |
5caf2a00 CM |
231 | path = btrfs_alloc_path(); |
232 | BUG_ON(!path); | |
233 | btrfs_init_path(path); | |
f254e52c CM |
234 | file_key.objectid = objectid; |
235 | file_key.offset = offset; | |
236 | file_key.flags = 0; | |
237 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); | |
2da566ed | 238 | mutex_lock(&root->fs_info->fs_mutex); |
6567e837 | 239 | |
b18c6685 | 240 | item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0); |
6567e837 CM |
241 | if (IS_ERR(item)) { |
242 | ret = PTR_ERR(item); | |
a429e513 CM |
243 | /* a csum that isn't present is a preallocated region. */ |
244 | if (ret == -ENOENT || ret == -EFBIG) | |
3a686375 | 245 | ret = -ENOENT; |
f254e52c | 246 | goto fail; |
6567e837 CM |
247 | } |
248 | ||
f254e52c CM |
249 | ret = btrfs_csum_data(root, data, len, result); |
250 | WARN_ON(ret); | |
509659cd | 251 | if (memcmp(result, &item->csum, BTRFS_CRC32_SIZE)) |
f254e52c CM |
252 | ret = 1; |
253 | fail: | |
5caf2a00 CM |
254 | btrfs_release_path(root, path); |
255 | btrfs_free_path(path); | |
2da566ed | 256 | mutex_unlock(&root->fs_info->fs_mutex); |
f254e52c CM |
257 | return ret; |
258 | } | |
259 |