Commit | Line | Data |
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6cbd5570 CM |
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 | ||
065631f6 | 19 | #include <linux/bio.h> |
5a0e3ad6 | 20 | #include <linux/slab.h> |
065631f6 CM |
21 | #include <linux/pagemap.h> |
22 | #include <linux/highmem.h> | |
1e1d2701 | 23 | #include "ctree.h" |
dee26a9f | 24 | #include "disk-io.h" |
9f5fae2f | 25 | #include "transaction.h" |
1de037a4 | 26 | #include "print-tree.h" |
1e1d2701 | 27 | |
d397712b | 28 | #define MAX_CSUM_ITEMS(r, size) ((((BTRFS_LEAF_DATA_SIZE(r) - \ |
607d432d JB |
29 | sizeof(struct btrfs_item) * 2) / \ |
30 | size) - 1)) | |
07d400a6 YZ |
31 | |
32 | #define MAX_ORDERED_SUM_BYTES(r) ((PAGE_SIZE - \ | |
33 | sizeof(struct btrfs_ordered_sum)) / \ | |
34 | sizeof(struct btrfs_sector_sum) * \ | |
35 | (r)->sectorsize - (r)->sectorsize) | |
36 | ||
b18c6685 | 37 | int btrfs_insert_file_extent(struct btrfs_trans_handle *trans, |
f2eb0a24 SW |
38 | struct btrfs_root *root, |
39 | u64 objectid, u64 pos, | |
40 | u64 disk_offset, u64 disk_num_bytes, | |
c8b97818 CM |
41 | u64 num_bytes, u64 offset, u64 ram_bytes, |
42 | u8 compression, u8 encryption, u16 other_encoding) | |
9f5fae2f | 43 | { |
dee26a9f CM |
44 | int ret = 0; |
45 | struct btrfs_file_extent_item *item; | |
46 | struct btrfs_key file_key; | |
5caf2a00 | 47 | struct btrfs_path *path; |
5f39d397 | 48 | struct extent_buffer *leaf; |
dee26a9f | 49 | |
5caf2a00 | 50 | path = btrfs_alloc_path(); |
db5b493a TI |
51 | if (!path) |
52 | return -ENOMEM; | |
dee26a9f | 53 | file_key.objectid = objectid; |
b18c6685 | 54 | file_key.offset = pos; |
dee26a9f CM |
55 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
56 | ||
b9473439 | 57 | path->leave_spinning = 1; |
5caf2a00 | 58 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
dee26a9f | 59 | sizeof(*item)); |
54aa1f4d CM |
60 | if (ret < 0) |
61 | goto out; | |
9773a788 | 62 | BUG_ON(ret); |
5f39d397 CM |
63 | leaf = path->nodes[0]; |
64 | item = btrfs_item_ptr(leaf, path->slots[0], | |
dee26a9f | 65 | struct btrfs_file_extent_item); |
f2eb0a24 | 66 | btrfs_set_file_extent_disk_bytenr(leaf, item, disk_offset); |
db94535d | 67 | btrfs_set_file_extent_disk_num_bytes(leaf, item, disk_num_bytes); |
f2eb0a24 | 68 | btrfs_set_file_extent_offset(leaf, item, offset); |
db94535d | 69 | btrfs_set_file_extent_num_bytes(leaf, item, num_bytes); |
c8b97818 | 70 | btrfs_set_file_extent_ram_bytes(leaf, item, ram_bytes); |
5f39d397 CM |
71 | btrfs_set_file_extent_generation(leaf, item, trans->transid); |
72 | btrfs_set_file_extent_type(leaf, item, BTRFS_FILE_EXTENT_REG); | |
c8b97818 CM |
73 | btrfs_set_file_extent_compression(leaf, item, compression); |
74 | btrfs_set_file_extent_encryption(leaf, item, encryption); | |
75 | btrfs_set_file_extent_other_encoding(leaf, item, other_encoding); | |
76 | ||
5f39d397 | 77 | btrfs_mark_buffer_dirty(leaf); |
54aa1f4d | 78 | out: |
5caf2a00 | 79 | btrfs_free_path(path); |
54aa1f4d | 80 | return ret; |
9f5fae2f | 81 | } |
dee26a9f | 82 | |
b18c6685 CM |
83 | struct btrfs_csum_item *btrfs_lookup_csum(struct btrfs_trans_handle *trans, |
84 | struct btrfs_root *root, | |
85 | struct btrfs_path *path, | |
d20f7043 | 86 | u64 bytenr, int cow) |
6567e837 CM |
87 | { |
88 | int ret; | |
89 | struct btrfs_key file_key; | |
90 | struct btrfs_key found_key; | |
91 | struct btrfs_csum_item *item; | |
5f39d397 | 92 | struct extent_buffer *leaf; |
6567e837 | 93 | u64 csum_offset = 0; |
607d432d JB |
94 | u16 csum_size = |
95 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
a429e513 | 96 | int csums_in_item; |
6567e837 | 97 | |
d20f7043 CM |
98 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
99 | file_key.offset = bytenr; | |
100 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); | |
b18c6685 | 101 | ret = btrfs_search_slot(trans, root, &file_key, path, 0, cow); |
6567e837 CM |
102 | if (ret < 0) |
103 | goto fail; | |
5f39d397 | 104 | leaf = path->nodes[0]; |
6567e837 CM |
105 | if (ret > 0) { |
106 | ret = 1; | |
70b2befd | 107 | if (path->slots[0] == 0) |
6567e837 CM |
108 | goto fail; |
109 | path->slots[0]--; | |
5f39d397 | 110 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); |
d20f7043 | 111 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY) |
6567e837 | 112 | goto fail; |
d20f7043 CM |
113 | |
114 | csum_offset = (bytenr - found_key.offset) >> | |
6567e837 | 115 | root->fs_info->sb->s_blocksize_bits; |
5f39d397 | 116 | csums_in_item = btrfs_item_size_nr(leaf, path->slots[0]); |
607d432d | 117 | csums_in_item /= csum_size; |
a429e513 CM |
118 | |
119 | if (csum_offset >= csums_in_item) { | |
120 | ret = -EFBIG; | |
6567e837 CM |
121 | goto fail; |
122 | } | |
123 | } | |
124 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); | |
509659cd | 125 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
607d432d | 126 | csum_offset * csum_size); |
6567e837 CM |
127 | return item; |
128 | fail: | |
129 | if (ret > 0) | |
b18c6685 | 130 | ret = -ENOENT; |
6567e837 CM |
131 | return ERR_PTR(ret); |
132 | } | |
133 | ||
134 | ||
dee26a9f CM |
135 | int btrfs_lookup_file_extent(struct btrfs_trans_handle *trans, |
136 | struct btrfs_root *root, | |
137 | struct btrfs_path *path, u64 objectid, | |
9773a788 | 138 | u64 offset, int mod) |
dee26a9f CM |
139 | { |
140 | int ret; | |
141 | struct btrfs_key file_key; | |
142 | int ins_len = mod < 0 ? -1 : 0; | |
143 | int cow = mod != 0; | |
144 | ||
145 | file_key.objectid = objectid; | |
70b2befd | 146 | file_key.offset = offset; |
dee26a9f CM |
147 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_DATA_KEY); |
148 | ret = btrfs_search_slot(trans, root, &file_key, path, ins_len, cow); | |
149 | return ret; | |
150 | } | |
f254e52c | 151 | |
17d217fe | 152 | |
4b46fce2 JB |
153 | static int __btrfs_lookup_bio_sums(struct btrfs_root *root, |
154 | struct inode *inode, struct bio *bio, | |
155 | u64 logical_offset, u32 *dst, int dio) | |
61b49440 CM |
156 | { |
157 | u32 sum; | |
158 | struct bio_vec *bvec = bio->bi_io_vec; | |
159 | int bio_index = 0; | |
4b46fce2 | 160 | u64 offset = 0; |
61b49440 CM |
161 | u64 item_start_offset = 0; |
162 | u64 item_last_offset = 0; | |
d20f7043 | 163 | u64 disk_bytenr; |
61b49440 | 164 | u32 diff; |
607d432d JB |
165 | u16 csum_size = |
166 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
61b49440 CM |
167 | int ret; |
168 | struct btrfs_path *path; | |
169 | struct btrfs_csum_item *item = NULL; | |
170 | struct extent_io_tree *io_tree = &BTRFS_I(inode)->io_tree; | |
171 | ||
172 | path = btrfs_alloc_path(); | |
4d1b5fb4 CM |
173 | if (bio->bi_size > PAGE_CACHE_SIZE * 8) |
174 | path->reada = 2; | |
61b49440 CM |
175 | |
176 | WARN_ON(bio->bi_vcnt <= 0); | |
177 | ||
d20f7043 | 178 | disk_bytenr = (u64)bio->bi_sector << 9; |
4b46fce2 JB |
179 | if (dio) |
180 | offset = logical_offset; | |
d397712b | 181 | while (bio_index < bio->bi_vcnt) { |
4b46fce2 JB |
182 | if (!dio) |
183 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
d20f7043 | 184 | ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum); |
61b49440 CM |
185 | if (ret == 0) |
186 | goto found; | |
187 | ||
d20f7043 CM |
188 | if (!item || disk_bytenr < item_start_offset || |
189 | disk_bytenr >= item_last_offset) { | |
61b49440 CM |
190 | struct btrfs_key found_key; |
191 | u32 item_size; | |
192 | ||
193 | if (item) | |
194 | btrfs_release_path(root, path); | |
d20f7043 CM |
195 | item = btrfs_lookup_csum(NULL, root->fs_info->csum_root, |
196 | path, disk_bytenr, 0); | |
61b49440 CM |
197 | if (IS_ERR(item)) { |
198 | ret = PTR_ERR(item); | |
199 | if (ret == -ENOENT || ret == -EFBIG) | |
200 | ret = 0; | |
201 | sum = 0; | |
17d217fe YZ |
202 | if (BTRFS_I(inode)->root->root_key.objectid == |
203 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
204 | set_extent_bits(io_tree, offset, | |
205 | offset + bvec->bv_len - 1, | |
206 | EXTENT_NODATASUM, GFP_NOFS); | |
207 | } else { | |
d397712b CM |
208 | printk(KERN_INFO "btrfs no csum found " |
209 | "for inode %lu start %llu\n", | |
210 | inode->i_ino, | |
17d217fe YZ |
211 | (unsigned long long)offset); |
212 | } | |
6dab8157 | 213 | item = NULL; |
39be25cd | 214 | btrfs_release_path(root, path); |
61b49440 CM |
215 | goto found; |
216 | } | |
217 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
218 | path->slots[0]); | |
219 | ||
220 | item_start_offset = found_key.offset; | |
221 | item_size = btrfs_item_size_nr(path->nodes[0], | |
222 | path->slots[0]); | |
223 | item_last_offset = item_start_offset + | |
607d432d | 224 | (item_size / csum_size) * |
61b49440 CM |
225 | root->sectorsize; |
226 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
227 | struct btrfs_csum_item); | |
228 | } | |
229 | /* | |
230 | * this byte range must be able to fit inside | |
231 | * a single leaf so it will also fit inside a u32 | |
232 | */ | |
d20f7043 | 233 | diff = disk_bytenr - item_start_offset; |
61b49440 | 234 | diff = diff / root->sectorsize; |
607d432d | 235 | diff = diff * csum_size; |
61b49440 CM |
236 | |
237 | read_extent_buffer(path->nodes[0], &sum, | |
3de9d6b6 | 238 | ((unsigned long)item) + diff, |
607d432d | 239 | csum_size); |
61b49440 | 240 | found: |
d20f7043 CM |
241 | if (dst) |
242 | *dst++ = sum; | |
243 | else | |
244 | set_state_private(io_tree, offset, sum); | |
245 | disk_bytenr += bvec->bv_len; | |
4b46fce2 | 246 | offset += bvec->bv_len; |
61b49440 CM |
247 | bio_index++; |
248 | bvec++; | |
249 | } | |
250 | btrfs_free_path(path); | |
251 | return 0; | |
252 | } | |
253 | ||
4b46fce2 JB |
254 | int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, |
255 | struct bio *bio, u32 *dst) | |
256 | { | |
257 | return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0); | |
258 | } | |
259 | ||
260 | int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, | |
261 | struct bio *bio, u64 offset, u32 *dst) | |
262 | { | |
263 | return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1); | |
264 | } | |
265 | ||
17d217fe YZ |
266 | int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, |
267 | struct list_head *list) | |
268 | { | |
269 | struct btrfs_key key; | |
270 | struct btrfs_path *path; | |
271 | struct extent_buffer *leaf; | |
272 | struct btrfs_ordered_sum *sums; | |
273 | struct btrfs_sector_sum *sector_sum; | |
274 | struct btrfs_csum_item *item; | |
275 | unsigned long offset; | |
276 | int ret; | |
277 | size_t size; | |
278 | u64 csum_end; | |
279 | u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy); | |
280 | ||
281 | path = btrfs_alloc_path(); | |
282 | BUG_ON(!path); | |
283 | ||
284 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; | |
285 | key.offset = start; | |
286 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
287 | ||
07d400a6 | 288 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
17d217fe YZ |
289 | if (ret < 0) |
290 | goto fail; | |
291 | if (ret > 0 && path->slots[0] > 0) { | |
292 | leaf = path->nodes[0]; | |
293 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); | |
294 | if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID && | |
295 | key.type == BTRFS_EXTENT_CSUM_KEY) { | |
296 | offset = (start - key.offset) >> | |
297 | root->fs_info->sb->s_blocksize_bits; | |
298 | if (offset * csum_size < | |
299 | btrfs_item_size_nr(leaf, path->slots[0] - 1)) | |
300 | path->slots[0]--; | |
301 | } | |
302 | } | |
303 | ||
304 | while (start <= end) { | |
305 | leaf = path->nodes[0]; | |
306 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
07d400a6 | 307 | ret = btrfs_next_leaf(root, path); |
17d217fe YZ |
308 | if (ret < 0) |
309 | goto fail; | |
310 | if (ret > 0) | |
311 | break; | |
312 | leaf = path->nodes[0]; | |
313 | } | |
314 | ||
315 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
316 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
317 | key.type != BTRFS_EXTENT_CSUM_KEY) | |
318 | break; | |
319 | ||
320 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
321 | if (key.offset > end) | |
322 | break; | |
323 | ||
324 | if (key.offset > start) | |
325 | start = key.offset; | |
326 | ||
327 | size = btrfs_item_size_nr(leaf, path->slots[0]); | |
328 | csum_end = key.offset + (size / csum_size) * root->sectorsize; | |
87b29b20 YZ |
329 | if (csum_end <= start) { |
330 | path->slots[0]++; | |
331 | continue; | |
332 | } | |
17d217fe | 333 | |
07d400a6 | 334 | csum_end = min(csum_end, end + 1); |
17d217fe YZ |
335 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
336 | struct btrfs_csum_item); | |
07d400a6 YZ |
337 | while (start < csum_end) { |
338 | size = min_t(size_t, csum_end - start, | |
339 | MAX_ORDERED_SUM_BYTES(root)); | |
340 | sums = kzalloc(btrfs_ordered_sum_size(root, size), | |
341 | GFP_NOFS); | |
342 | BUG_ON(!sums); | |
17d217fe | 343 | |
07d400a6 YZ |
344 | sector_sum = sums->sums; |
345 | sums->bytenr = start; | |
346 | sums->len = size; | |
347 | ||
348 | offset = (start - key.offset) >> | |
349 | root->fs_info->sb->s_blocksize_bits; | |
350 | offset *= csum_size; | |
351 | ||
352 | while (size > 0) { | |
353 | read_extent_buffer(path->nodes[0], | |
354 | §or_sum->sum, | |
355 | ((unsigned long)item) + | |
356 | offset, csum_size); | |
357 | sector_sum->bytenr = start; | |
358 | ||
359 | size -= root->sectorsize; | |
360 | start += root->sectorsize; | |
361 | offset += csum_size; | |
362 | sector_sum++; | |
363 | } | |
364 | list_add_tail(&sums->list, list); | |
365 | } | |
17d217fe YZ |
366 | path->slots[0]++; |
367 | } | |
368 | ret = 0; | |
369 | fail: | |
370 | btrfs_free_path(path); | |
371 | return ret; | |
372 | } | |
373 | ||
3edf7d33 | 374 | int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, |
d20f7043 | 375 | struct bio *bio, u64 file_start, int contig) |
e015640f | 376 | { |
e6dcd2dc CM |
377 | struct btrfs_ordered_sum *sums; |
378 | struct btrfs_sector_sum *sector_sum; | |
3edf7d33 | 379 | struct btrfs_ordered_extent *ordered; |
e015640f CM |
380 | char *data; |
381 | struct bio_vec *bvec = bio->bi_io_vec; | |
382 | int bio_index = 0; | |
3edf7d33 CM |
383 | unsigned long total_bytes = 0; |
384 | unsigned long this_sum_bytes = 0; | |
385 | u64 offset; | |
d20f7043 | 386 | u64 disk_bytenr; |
e015640f | 387 | |
e6dcd2dc CM |
388 | WARN_ON(bio->bi_vcnt <= 0); |
389 | sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS); | |
e015640f CM |
390 | if (!sums) |
391 | return -ENOMEM; | |
3edf7d33 | 392 | |
ed98b56a | 393 | sector_sum = sums->sums; |
d20f7043 | 394 | disk_bytenr = (u64)bio->bi_sector << 9; |
e6dcd2dc CM |
395 | sums->len = bio->bi_size; |
396 | INIT_LIST_HEAD(&sums->list); | |
d20f7043 CM |
397 | |
398 | if (contig) | |
399 | offset = file_start; | |
400 | else | |
401 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
402 | ||
403 | ordered = btrfs_lookup_ordered_extent(inode, offset); | |
3edf7d33 | 404 | BUG_ON(!ordered); |
d20f7043 | 405 | sums->bytenr = ordered->start; |
e015640f | 406 | |
d397712b | 407 | while (bio_index < bio->bi_vcnt) { |
d20f7043 CM |
408 | if (!contig) |
409 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
410 | ||
411 | if (!contig && (offset >= ordered->file_offset + ordered->len || | |
412 | offset < ordered->file_offset)) { | |
3edf7d33 CM |
413 | unsigned long bytes_left; |
414 | sums->len = this_sum_bytes; | |
415 | this_sum_bytes = 0; | |
416 | btrfs_add_ordered_sum(inode, ordered, sums); | |
417 | btrfs_put_ordered_extent(ordered); | |
418 | ||
419 | bytes_left = bio->bi_size - total_bytes; | |
420 | ||
421 | sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left), | |
422 | GFP_NOFS); | |
423 | BUG_ON(!sums); | |
ed98b56a | 424 | sector_sum = sums->sums; |
3edf7d33 | 425 | sums->len = bytes_left; |
d20f7043 | 426 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
3edf7d33 | 427 | BUG_ON(!ordered); |
d20f7043 | 428 | sums->bytenr = ordered->start; |
3edf7d33 CM |
429 | } |
430 | ||
e015640f | 431 | data = kmap_atomic(bvec->bv_page, KM_USER0); |
e6dcd2dc CM |
432 | sector_sum->sum = ~(u32)0; |
433 | sector_sum->sum = btrfs_csum_data(root, | |
434 | data + bvec->bv_offset, | |
435 | sector_sum->sum, | |
436 | bvec->bv_len); | |
e015640f | 437 | kunmap_atomic(data, KM_USER0); |
e6dcd2dc CM |
438 | btrfs_csum_final(sector_sum->sum, |
439 | (char *)§or_sum->sum); | |
d20f7043 | 440 | sector_sum->bytenr = disk_bytenr; |
ed98b56a | 441 | |
e6dcd2dc | 442 | sector_sum++; |
e015640f | 443 | bio_index++; |
3edf7d33 CM |
444 | total_bytes += bvec->bv_len; |
445 | this_sum_bytes += bvec->bv_len; | |
d20f7043 CM |
446 | disk_bytenr += bvec->bv_len; |
447 | offset += bvec->bv_len; | |
e015640f CM |
448 | bvec++; |
449 | } | |
ed98b56a | 450 | this_sum_bytes = 0; |
3edf7d33 CM |
451 | btrfs_add_ordered_sum(inode, ordered, sums); |
452 | btrfs_put_ordered_extent(ordered); | |
e015640f CM |
453 | return 0; |
454 | } | |
455 | ||
459931ec CM |
456 | /* |
457 | * helper function for csum removal, this expects the | |
458 | * key to describe the csum pointed to by the path, and it expects | |
459 | * the csum to overlap the range [bytenr, len] | |
460 | * | |
461 | * The csum should not be entirely contained in the range and the | |
462 | * range should not be entirely contained in the csum. | |
463 | * | |
464 | * This calls btrfs_truncate_item with the correct args based on the | |
465 | * overlap, and fixes up the key as required. | |
466 | */ | |
467 | static noinline int truncate_one_csum(struct btrfs_trans_handle *trans, | |
468 | struct btrfs_root *root, | |
469 | struct btrfs_path *path, | |
470 | struct btrfs_key *key, | |
471 | u64 bytenr, u64 len) | |
472 | { | |
473 | struct extent_buffer *leaf; | |
474 | u16 csum_size = | |
475 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
476 | u64 csum_end; | |
477 | u64 end_byte = bytenr + len; | |
478 | u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits; | |
479 | int ret; | |
480 | ||
481 | leaf = path->nodes[0]; | |
482 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; | |
483 | csum_end <<= root->fs_info->sb->s_blocksize_bits; | |
484 | csum_end += key->offset; | |
485 | ||
486 | if (key->offset < bytenr && csum_end <= end_byte) { | |
487 | /* | |
488 | * [ bytenr - len ] | |
489 | * [ ] | |
490 | * [csum ] | |
491 | * A simple truncate off the end of the item | |
492 | */ | |
493 | u32 new_size = (bytenr - key->offset) >> blocksize_bits; | |
494 | new_size *= csum_size; | |
495 | ret = btrfs_truncate_item(trans, root, path, new_size, 1); | |
496 | BUG_ON(ret); | |
497 | } else if (key->offset >= bytenr && csum_end > end_byte && | |
498 | end_byte > key->offset) { | |
499 | /* | |
500 | * [ bytenr - len ] | |
501 | * [ ] | |
502 | * [csum ] | |
503 | * we need to truncate from the beginning of the csum | |
504 | */ | |
505 | u32 new_size = (csum_end - end_byte) >> blocksize_bits; | |
506 | new_size *= csum_size; | |
507 | ||
508 | ret = btrfs_truncate_item(trans, root, path, new_size, 0); | |
509 | BUG_ON(ret); | |
510 | ||
511 | key->offset = end_byte; | |
512 | ret = btrfs_set_item_key_safe(trans, root, path, key); | |
513 | BUG_ON(ret); | |
514 | } else { | |
515 | BUG(); | |
516 | } | |
517 | return 0; | |
518 | } | |
519 | ||
520 | /* | |
521 | * deletes the csum items from the csum tree for a given | |
522 | * range of bytes. | |
523 | */ | |
524 | int btrfs_del_csums(struct btrfs_trans_handle *trans, | |
525 | struct btrfs_root *root, u64 bytenr, u64 len) | |
526 | { | |
527 | struct btrfs_path *path; | |
528 | struct btrfs_key key; | |
529 | u64 end_byte = bytenr + len; | |
530 | u64 csum_end; | |
531 | struct extent_buffer *leaf; | |
532 | int ret; | |
533 | u16 csum_size = | |
534 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
535 | int blocksize_bits = root->fs_info->sb->s_blocksize_bits; | |
536 | ||
537 | root = root->fs_info->csum_root; | |
538 | ||
539 | path = btrfs_alloc_path(); | |
2a29edc6 | 540 | if (!path) |
541 | return -ENOMEM; | |
459931ec | 542 | |
d397712b | 543 | while (1) { |
459931ec CM |
544 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
545 | key.offset = end_byte - 1; | |
546 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
547 | ||
b9473439 | 548 | path->leave_spinning = 1; |
459931ec CM |
549 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
550 | if (ret > 0) { | |
551 | if (path->slots[0] == 0) | |
552 | goto out; | |
553 | path->slots[0]--; | |
ad0397a7 JB |
554 | } else if (ret < 0) { |
555 | goto out; | |
459931ec | 556 | } |
ad0397a7 | 557 | |
459931ec CM |
558 | leaf = path->nodes[0]; |
559 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
560 | ||
561 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
562 | key.type != BTRFS_EXTENT_CSUM_KEY) { | |
563 | break; | |
564 | } | |
565 | ||
566 | if (key.offset >= end_byte) | |
567 | break; | |
568 | ||
569 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; | |
570 | csum_end <<= blocksize_bits; | |
571 | csum_end += key.offset; | |
572 | ||
573 | /* this csum ends before we start, we're done */ | |
574 | if (csum_end <= bytenr) | |
575 | break; | |
576 | ||
577 | /* delete the entire item, it is inside our range */ | |
578 | if (key.offset >= bytenr && csum_end <= end_byte) { | |
579 | ret = btrfs_del_item(trans, root, path); | |
580 | BUG_ON(ret); | |
dcbdd4dc CM |
581 | if (key.offset == bytenr) |
582 | break; | |
459931ec CM |
583 | } else if (key.offset < bytenr && csum_end > end_byte) { |
584 | unsigned long offset; | |
585 | unsigned long shift_len; | |
586 | unsigned long item_offset; | |
587 | /* | |
588 | * [ bytenr - len ] | |
589 | * [csum ] | |
590 | * | |
591 | * Our bytes are in the middle of the csum, | |
592 | * we need to split this item and insert a new one. | |
593 | * | |
594 | * But we can't drop the path because the | |
595 | * csum could change, get removed, extended etc. | |
596 | * | |
597 | * The trick here is the max size of a csum item leaves | |
598 | * enough room in the tree block for a single | |
599 | * item header. So, we split the item in place, | |
600 | * adding a new header pointing to the existing | |
601 | * bytes. Then we loop around again and we have | |
602 | * a nicely formed csum item that we can neatly | |
603 | * truncate. | |
604 | */ | |
605 | offset = (bytenr - key.offset) >> blocksize_bits; | |
606 | offset *= csum_size; | |
607 | ||
608 | shift_len = (len >> blocksize_bits) * csum_size; | |
609 | ||
610 | item_offset = btrfs_item_ptr_offset(leaf, | |
611 | path->slots[0]); | |
612 | ||
613 | memset_extent_buffer(leaf, 0, item_offset + offset, | |
614 | shift_len); | |
615 | key.offset = bytenr; | |
616 | ||
617 | /* | |
618 | * btrfs_split_item returns -EAGAIN when the | |
619 | * item changed size or key | |
620 | */ | |
621 | ret = btrfs_split_item(trans, root, path, &key, offset); | |
622 | BUG_ON(ret && ret != -EAGAIN); | |
623 | ||
624 | key.offset = end_byte - 1; | |
625 | } else { | |
626 | ret = truncate_one_csum(trans, root, path, | |
627 | &key, bytenr, len); | |
628 | BUG_ON(ret); | |
dcbdd4dc CM |
629 | if (key.offset < bytenr) |
630 | break; | |
459931ec CM |
631 | } |
632 | btrfs_release_path(root, path); | |
633 | } | |
634 | out: | |
635 | btrfs_free_path(path); | |
636 | return 0; | |
637 | } | |
638 | ||
065631f6 | 639 | int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, |
d20f7043 | 640 | struct btrfs_root *root, |
e6dcd2dc | 641 | struct btrfs_ordered_sum *sums) |
f254e52c | 642 | { |
d20f7043 | 643 | u64 bytenr; |
f254e52c CM |
644 | int ret; |
645 | struct btrfs_key file_key; | |
6567e837 | 646 | struct btrfs_key found_key; |
065631f6 | 647 | u64 next_offset; |
e6dcd2dc | 648 | u64 total_bytes = 0; |
065631f6 | 649 | int found_next; |
5caf2a00 | 650 | struct btrfs_path *path; |
f254e52c | 651 | struct btrfs_csum_item *item; |
065631f6 | 652 | struct btrfs_csum_item *item_end; |
ff79f819 | 653 | struct extent_buffer *leaf = NULL; |
6567e837 | 654 | u64 csum_offset; |
e6dcd2dc | 655 | struct btrfs_sector_sum *sector_sum; |
f578d4bd CM |
656 | u32 nritems; |
657 | u32 ins_size; | |
6e92f5e6 CM |
658 | char *eb_map; |
659 | char *eb_token; | |
660 | unsigned long map_len; | |
661 | unsigned long map_start; | |
607d432d JB |
662 | u16 csum_size = |
663 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
6e92f5e6 | 664 | |
5caf2a00 CM |
665 | path = btrfs_alloc_path(); |
666 | BUG_ON(!path); | |
ed98b56a | 667 | sector_sum = sums->sums; |
065631f6 CM |
668 | again: |
669 | next_offset = (u64)-1; | |
670 | found_next = 0; | |
d20f7043 CM |
671 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
672 | file_key.offset = sector_sum->bytenr; | |
673 | bytenr = sector_sum->bytenr; | |
674 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); | |
a429e513 | 675 | |
d20f7043 | 676 | item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1); |
ff79f819 CM |
677 | if (!IS_ERR(item)) { |
678 | leaf = path->nodes[0]; | |
639cb586 | 679 | ret = 0; |
a429e513 | 680 | goto found; |
ff79f819 | 681 | } |
a429e513 | 682 | ret = PTR_ERR(item); |
4a500fd1 YZ |
683 | if (ret != -EFBIG && ret != -ENOENT) |
684 | goto fail_unlock; | |
685 | ||
a429e513 CM |
686 | if (ret == -EFBIG) { |
687 | u32 item_size; | |
688 | /* we found one, but it isn't big enough yet */ | |
5f39d397 CM |
689 | leaf = path->nodes[0]; |
690 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
607d432d JB |
691 | if ((item_size / csum_size) >= |
692 | MAX_CSUM_ITEMS(root, csum_size)) { | |
a429e513 CM |
693 | /* already at max size, make a new one */ |
694 | goto insert; | |
695 | } | |
696 | } else { | |
f578d4bd | 697 | int slot = path->slots[0] + 1; |
a429e513 | 698 | /* we didn't find a csum item, insert one */ |
f578d4bd CM |
699 | nritems = btrfs_header_nritems(path->nodes[0]); |
700 | if (path->slots[0] >= nritems - 1) { | |
701 | ret = btrfs_next_leaf(root, path); | |
b56baf5b | 702 | if (ret == 1) |
f578d4bd | 703 | found_next = 1; |
b56baf5b | 704 | if (ret != 0) |
f578d4bd | 705 | goto insert; |
b56baf5b | 706 | slot = 0; |
f578d4bd CM |
707 | } |
708 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); | |
d20f7043 CM |
709 | if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
710 | found_key.type != BTRFS_EXTENT_CSUM_KEY) { | |
f578d4bd CM |
711 | found_next = 1; |
712 | goto insert; | |
713 | } | |
714 | next_offset = found_key.offset; | |
715 | found_next = 1; | |
a429e513 CM |
716 | goto insert; |
717 | } | |
718 | ||
719 | /* | |
720 | * at this point, we know the tree has an item, but it isn't big | |
721 | * enough yet to put our csum in. Grow it | |
722 | */ | |
723 | btrfs_release_path(root, path); | |
6567e837 | 724 | ret = btrfs_search_slot(trans, root, &file_key, path, |
607d432d | 725 | csum_size, 1); |
6567e837 | 726 | if (ret < 0) |
53863232 | 727 | goto fail_unlock; |
459931ec CM |
728 | |
729 | if (ret > 0) { | |
730 | if (path->slots[0] == 0) | |
731 | goto insert; | |
732 | path->slots[0]--; | |
6567e837 | 733 | } |
459931ec | 734 | |
5f39d397 CM |
735 | leaf = path->nodes[0]; |
736 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
d20f7043 | 737 | csum_offset = (bytenr - found_key.offset) >> |
6567e837 | 738 | root->fs_info->sb->s_blocksize_bits; |
459931ec | 739 | |
d20f7043 CM |
740 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY || |
741 | found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
607d432d | 742 | csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) { |
6567e837 CM |
743 | goto insert; |
744 | } | |
459931ec | 745 | |
5f39d397 | 746 | if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) / |
607d432d JB |
747 | csum_size) { |
748 | u32 diff = (csum_offset + 1) * csum_size; | |
459931ec CM |
749 | |
750 | /* | |
751 | * is the item big enough already? we dropped our lock | |
752 | * before and need to recheck | |
753 | */ | |
754 | if (diff < btrfs_item_size_nr(leaf, path->slots[0])) | |
755 | goto csum; | |
756 | ||
5f39d397 | 757 | diff = diff - btrfs_item_size_nr(leaf, path->slots[0]); |
d397712b | 758 | if (diff != csum_size) |
3a686375 | 759 | goto insert; |
459931ec | 760 | |
a429e513 | 761 | ret = btrfs_extend_item(trans, root, path, diff); |
6567e837 CM |
762 | BUG_ON(ret); |
763 | goto csum; | |
764 | } | |
765 | ||
766 | insert: | |
a429e513 | 767 | btrfs_release_path(root, path); |
6567e837 | 768 | csum_offset = 0; |
f578d4bd | 769 | if (found_next) { |
d20f7043 CM |
770 | u64 tmp = total_bytes + root->sectorsize; |
771 | u64 next_sector = sector_sum->bytenr; | |
772 | struct btrfs_sector_sum *next = sector_sum + 1; | |
773 | ||
d397712b | 774 | while (tmp < sums->len) { |
d20f7043 CM |
775 | if (next_sector + root->sectorsize != next->bytenr) |
776 | break; | |
777 | tmp += root->sectorsize; | |
778 | next_sector = next->bytenr; | |
779 | next++; | |
780 | } | |
781 | tmp = min(tmp, next_offset - file_key.offset); | |
f578d4bd CM |
782 | tmp >>= root->fs_info->sb->s_blocksize_bits; |
783 | tmp = max((u64)1, tmp); | |
607d432d JB |
784 | tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size)); |
785 | ins_size = csum_size * tmp; | |
f578d4bd | 786 | } else { |
607d432d | 787 | ins_size = csum_size; |
f578d4bd | 788 | } |
b9473439 | 789 | path->leave_spinning = 1; |
5caf2a00 | 790 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
f578d4bd | 791 | ins_size); |
b9473439 | 792 | path->leave_spinning = 0; |
54aa1f4d | 793 | if (ret < 0) |
53863232 | 794 | goto fail_unlock; |
a429e513 | 795 | if (ret != 0) { |
a429e513 | 796 | WARN_ON(1); |
53863232 | 797 | goto fail_unlock; |
a429e513 | 798 | } |
6567e837 | 799 | csum: |
5f39d397 CM |
800 | leaf = path->nodes[0]; |
801 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); | |
f254e52c | 802 | ret = 0; |
509659cd | 803 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
607d432d | 804 | csum_offset * csum_size); |
b18c6685 | 805 | found: |
065631f6 CM |
806 | item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
807 | item_end = (struct btrfs_csum_item *)((unsigned char *)item_end + | |
808 | btrfs_item_size_nr(leaf, path->slots[0])); | |
6e92f5e6 | 809 | eb_token = NULL; |
e6dcd2dc | 810 | next_sector: |
aadfeb6e | 811 | |
6e92f5e6 | 812 | if (!eb_token || |
607d432d | 813 | (unsigned long)item + csum_size >= map_start + map_len) { |
6e92f5e6 CM |
814 | int err; |
815 | ||
816 | if (eb_token) | |
eb20978f | 817 | unmap_extent_buffer(leaf, eb_token, KM_USER1); |
6e92f5e6 CM |
818 | eb_token = NULL; |
819 | err = map_private_extent_buffer(leaf, (unsigned long)item, | |
607d432d | 820 | csum_size, |
6e92f5e6 | 821 | &eb_token, &eb_map, |
eb20978f | 822 | &map_start, &map_len, KM_USER1); |
6e92f5e6 CM |
823 | if (err) |
824 | eb_token = NULL; | |
825 | } | |
826 | if (eb_token) { | |
827 | memcpy(eb_token + ((unsigned long)item & (PAGE_CACHE_SIZE - 1)), | |
607d432d | 828 | §or_sum->sum, csum_size); |
6e92f5e6 | 829 | } else { |
e6dcd2dc | 830 | write_extent_buffer(leaf, §or_sum->sum, |
607d432d | 831 | (unsigned long)item, csum_size); |
6e92f5e6 | 832 | } |
7f3c74fb | 833 | |
e6dcd2dc CM |
834 | total_bytes += root->sectorsize; |
835 | sector_sum++; | |
836 | if (total_bytes < sums->len) { | |
6e92f5e6 | 837 | item = (struct btrfs_csum_item *)((char *)item + |
607d432d | 838 | csum_size); |
d20f7043 CM |
839 | if (item < item_end && bytenr + PAGE_CACHE_SIZE == |
840 | sector_sum->bytenr) { | |
841 | bytenr = sector_sum->bytenr; | |
e6dcd2dc | 842 | goto next_sector; |
2e1a992e | 843 | } |
065631f6 | 844 | } |
6e92f5e6 | 845 | if (eb_token) { |
eb20978f | 846 | unmap_extent_buffer(leaf, eb_token, KM_USER1); |
6e92f5e6 CM |
847 | eb_token = NULL; |
848 | } | |
5caf2a00 | 849 | btrfs_mark_buffer_dirty(path->nodes[0]); |
e6dcd2dc | 850 | if (total_bytes < sums->len) { |
065631f6 | 851 | btrfs_release_path(root, path); |
b9473439 | 852 | cond_resched(); |
065631f6 CM |
853 | goto again; |
854 | } | |
53863232 | 855 | out: |
5caf2a00 | 856 | btrfs_free_path(path); |
f254e52c | 857 | return ret; |
53863232 CM |
858 | |
859 | fail_unlock: | |
53863232 | 860 | goto out; |
f254e52c | 861 | } |