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 | 65 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
6567e837 CM |
66 | if (ret < 0) |
67 | goto fail; | |
68 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
69 | if (ret > 0) { | |
70 | ret = 1; | |
70b2befd | 71 | if (path->slots[0] == 0) |
6567e837 CM |
72 | goto fail; |
73 | path->slots[0]--; | |
74 | btrfs_disk_key_to_cpu(&found_key, | |
75 | &leaf->items[path->slots[0]].key); | |
76 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || | |
77 | found_key.objectid != objectid) { | |
78 | goto fail; | |
79 | } | |
80 | csum_offset = (offset - found_key.offset) >> | |
81 | root->fs_info->sb->s_blocksize_bits; | |
82 | if (csum_offset >= | |
83 | btrfs_item_size(leaf->items + path->slots[0]) / | |
84 | sizeof(struct btrfs_csum_item)) { | |
85 | goto fail; | |
86 | } | |
87 | } | |
88 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); | |
89 | item += csum_offset; | |
90 | return item; | |
91 | fail: | |
92 | if (ret > 0) | |
b18c6685 | 93 | ret = -ENOENT; |
6567e837 CM |
94 | return ERR_PTR(ret); |
95 | } | |
96 | ||
97 | ||
dee26a9f CM |
98 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
99 | struct btrfs_root *root, | |
100 | struct btrfs_path *path, u64 objectid, | |
9773a788 | 101 | u64 offset, int mod) |
dee26a9f CM |
102 | { |
103 | int ret; | |
104 | struct btrfs_key file_key; | |
105 | int ins_len = mod < 0 ? -1 : 0; | |
106 | int cow = mod != 0; | |
107 | ||
108 | file_key.objectid = objectid; | |
70b2befd | 109 | file_key.offset = offset; |
dee26a9f CM |
110 | file_key.flags = 0; |
111 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); | |
112 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); | |
113 | return ret; | |
114 | } | |
f254e52c CM |
115 | |
116 | int btrfs_csum_file_block(struct btrfs_trans_handle *trans, | |
117 | struct btrfs_root *root, | |
118 | u64 objectid, u64 offset, | |
119 | char *data, size_t len) | |
120 | { | |
121 | int ret; | |
122 | struct btrfs_key file_key; | |
6567e837 | 123 | struct btrfs_key found_key; |
5caf2a00 | 124 | struct btrfs_path *path; |
f254e52c | 125 | struct btrfs_csum_item *item; |
6567e837 CM |
126 | struct btrfs_leaf *leaf; |
127 | u64 csum_offset; | |
f254e52c | 128 | |
5caf2a00 CM |
129 | path = btrfs_alloc_path(); |
130 | BUG_ON(!path); | |
131 | btrfs_init_path(path); | |
b18c6685 CM |
132 | |
133 | item = btrfs_lookup_csum(trans, root, path, objectid, offset, 0); | |
134 | if (!IS_ERR(item)) | |
135 | goto found; | |
136 | btrfs_release_path(root, path); | |
f254e52c CM |
137 | file_key.objectid = objectid; |
138 | file_key.offset = offset; | |
139 | file_key.flags = 0; | |
140 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); | |
6567e837 CM |
141 | ret = btrfs_search_slot(trans, root, &file_key, path, |
142 | sizeof(struct btrfs_csum_item), 1); | |
143 | if (ret < 0) | |
144 | goto fail; | |
145 | if (ret == 0) { | |
b18c6685 | 146 | BUG(); |
6567e837 CM |
147 | } |
148 | if (path->slots[0] == 0) { | |
149 | btrfs_release_path(root, path); | |
150 | goto insert; | |
151 | } | |
152 | path->slots[0]--; | |
153 | leaf = btrfs_buffer_leaf(path->nodes[0]); | |
154 | btrfs_disk_key_to_cpu(&found_key, &leaf->items[path->slots[0]].key); | |
155 | csum_offset = (offset - found_key.offset) >> | |
156 | root->fs_info->sb->s_blocksize_bits; | |
157 | if (btrfs_key_type(&found_key) != BTRFS_CSUM_ITEM_KEY || | |
158 | found_key.objectid != objectid || | |
159 | csum_offset >= MAX_CSUM_ITEMS(root)) { | |
160 | btrfs_release_path(root, path); | |
161 | goto insert; | |
162 | } | |
163 | if (csum_offset >= btrfs_item_size(leaf->items + path->slots[0]) / | |
164 | sizeof(struct btrfs_csum_item)) { | |
165 | ret = btrfs_extend_item(trans, root, path, | |
166 | sizeof(struct btrfs_csum_item)); | |
167 | BUG_ON(ret); | |
168 | goto csum; | |
169 | } | |
170 | ||
171 | insert: | |
172 | csum_offset = 0; | |
5caf2a00 | 173 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
6567e837 | 174 | sizeof(struct btrfs_csum_item)); |
f254e52c CM |
175 | if (ret != 0 && ret != -EEXIST) |
176 | goto fail; | |
6567e837 | 177 | csum: |
5caf2a00 | 178 | item = btrfs_item_ptr(btrfs_buffer_leaf(path->nodes[0]), path->slots[0], |
f254e52c CM |
179 | struct btrfs_csum_item); |
180 | ret = 0; | |
6567e837 | 181 | item += csum_offset; |
b18c6685 | 182 | found: |
f254e52c | 183 | ret = btrfs_csum_data(root, data, len, item->csum); |
5caf2a00 | 184 | btrfs_mark_buffer_dirty(path->nodes[0]); |
f254e52c | 185 | fail: |
5caf2a00 CM |
186 | btrfs_release_path(root, path); |
187 | btrfs_free_path(path); | |
f254e52c CM |
188 | return ret; |
189 | } | |
190 | ||
191 | int btrfs_csum_verify_file_block(struct btrfs_root *root, | |
192 | u64 objectid, u64 offset, | |
193 | char *data, size_t len) | |
194 | { | |
195 | int ret; | |
196 | struct btrfs_key file_key; | |
5caf2a00 | 197 | struct btrfs_path *path; |
f254e52c CM |
198 | struct btrfs_csum_item *item; |
199 | char result[BTRFS_CSUM_SIZE]; | |
200 | ||
5caf2a00 CM |
201 | path = btrfs_alloc_path(); |
202 | BUG_ON(!path); | |
203 | btrfs_init_path(path); | |
f254e52c CM |
204 | file_key.objectid = objectid; |
205 | file_key.offset = offset; | |
206 | file_key.flags = 0; | |
207 | btrfs_set_key_type(&file_key, BTRFS_CSUM_ITEM_KEY); | |
2da566ed | 208 | mutex_lock(&root->fs_info->fs_mutex); |
6567e837 | 209 | |
b18c6685 | 210 | item = btrfs_lookup_csum(NULL, root, path, objectid, offset, 0); |
6567e837 CM |
211 | if (IS_ERR(item)) { |
212 | ret = PTR_ERR(item); | |
f254e52c | 213 | goto fail; |
6567e837 CM |
214 | } |
215 | ||
f254e52c CM |
216 | ret = btrfs_csum_data(root, data, len, result); |
217 | WARN_ON(ret); | |
218 | if (memcmp(result, item->csum, BTRFS_CSUM_SIZE)) | |
219 | ret = 1; | |
220 | fail: | |
5caf2a00 CM |
221 | btrfs_release_path(root, path); |
222 | btrfs_free_path(path); | |
2da566ed | 223 | mutex_unlock(&root->fs_info->fs_mutex); |
f254e52c CM |
224 | return ret; |
225 | } | |
226 |