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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(); | |
c2db1073 TI |
173 | if (!path) |
174 | return -ENOMEM; | |
4d1b5fb4 CM |
175 | if (bio->bi_size > PAGE_CACHE_SIZE * 8) |
176 | path->reada = 2; | |
61b49440 CM |
177 | |
178 | WARN_ON(bio->bi_vcnt <= 0); | |
179 | ||
2cf8572d CM |
180 | /* |
181 | * the free space stuff is only read when it hasn't been | |
182 | * updated in the current transaction. So, we can safely | |
183 | * read from the commit root and sidestep a nasty deadlock | |
184 | * between reading the free space cache and updating the csum tree. | |
185 | */ | |
ddf23b3f | 186 | if (btrfs_is_free_space_inode(root, inode)) { |
2cf8572d | 187 | path->search_commit_root = 1; |
ddf23b3f JB |
188 | path->skip_locking = 1; |
189 | } | |
2cf8572d | 190 | |
d20f7043 | 191 | disk_bytenr = (u64)bio->bi_sector << 9; |
4b46fce2 JB |
192 | if (dio) |
193 | offset = logical_offset; | |
d397712b | 194 | while (bio_index < bio->bi_vcnt) { |
4b46fce2 JB |
195 | if (!dio) |
196 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
d20f7043 | 197 | ret = btrfs_find_ordered_sum(inode, offset, disk_bytenr, &sum); |
61b49440 CM |
198 | if (ret == 0) |
199 | goto found; | |
200 | ||
d20f7043 CM |
201 | if (!item || disk_bytenr < item_start_offset || |
202 | disk_bytenr >= item_last_offset) { | |
61b49440 CM |
203 | struct btrfs_key found_key; |
204 | u32 item_size; | |
205 | ||
206 | if (item) | |
b3b4aa74 | 207 | btrfs_release_path(path); |
d20f7043 CM |
208 | item = btrfs_lookup_csum(NULL, root->fs_info->csum_root, |
209 | path, disk_bytenr, 0); | |
61b49440 CM |
210 | if (IS_ERR(item)) { |
211 | ret = PTR_ERR(item); | |
212 | if (ret == -ENOENT || ret == -EFBIG) | |
213 | ret = 0; | |
214 | sum = 0; | |
17d217fe YZ |
215 | if (BTRFS_I(inode)->root->root_key.objectid == |
216 | BTRFS_DATA_RELOC_TREE_OBJECTID) { | |
217 | set_extent_bits(io_tree, offset, | |
218 | offset + bvec->bv_len - 1, | |
219 | EXTENT_NODATASUM, GFP_NOFS); | |
220 | } else { | |
d397712b | 221 | printk(KERN_INFO "btrfs no csum found " |
33345d01 LZ |
222 | "for inode %llu start %llu\n", |
223 | (unsigned long long) | |
224 | btrfs_ino(inode), | |
17d217fe YZ |
225 | (unsigned long long)offset); |
226 | } | |
6dab8157 | 227 | item = NULL; |
b3b4aa74 | 228 | btrfs_release_path(path); |
61b49440 CM |
229 | goto found; |
230 | } | |
231 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, | |
232 | path->slots[0]); | |
233 | ||
234 | item_start_offset = found_key.offset; | |
235 | item_size = btrfs_item_size_nr(path->nodes[0], | |
236 | path->slots[0]); | |
237 | item_last_offset = item_start_offset + | |
607d432d | 238 | (item_size / csum_size) * |
61b49440 CM |
239 | root->sectorsize; |
240 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], | |
241 | struct btrfs_csum_item); | |
242 | } | |
243 | /* | |
244 | * this byte range must be able to fit inside | |
245 | * a single leaf so it will also fit inside a u32 | |
246 | */ | |
d20f7043 | 247 | diff = disk_bytenr - item_start_offset; |
61b49440 | 248 | diff = diff / root->sectorsize; |
607d432d | 249 | diff = diff * csum_size; |
61b49440 CM |
250 | |
251 | read_extent_buffer(path->nodes[0], &sum, | |
3de9d6b6 | 252 | ((unsigned long)item) + diff, |
607d432d | 253 | csum_size); |
61b49440 | 254 | found: |
d20f7043 CM |
255 | if (dst) |
256 | *dst++ = sum; | |
257 | else | |
258 | set_state_private(io_tree, offset, sum); | |
259 | disk_bytenr += bvec->bv_len; | |
4b46fce2 | 260 | offset += bvec->bv_len; |
61b49440 CM |
261 | bio_index++; |
262 | bvec++; | |
263 | } | |
264 | btrfs_free_path(path); | |
265 | return 0; | |
266 | } | |
267 | ||
4b46fce2 JB |
268 | int btrfs_lookup_bio_sums(struct btrfs_root *root, struct inode *inode, |
269 | struct bio *bio, u32 *dst) | |
270 | { | |
271 | return __btrfs_lookup_bio_sums(root, inode, bio, 0, dst, 0); | |
272 | } | |
273 | ||
274 | int btrfs_lookup_bio_sums_dio(struct btrfs_root *root, struct inode *inode, | |
275 | struct bio *bio, u64 offset, u32 *dst) | |
276 | { | |
277 | return __btrfs_lookup_bio_sums(root, inode, bio, offset, dst, 1); | |
278 | } | |
279 | ||
17d217fe | 280 | int btrfs_lookup_csums_range(struct btrfs_root *root, u64 start, u64 end, |
a2de733c | 281 | struct list_head *list, int search_commit) |
17d217fe YZ |
282 | { |
283 | struct btrfs_key key; | |
284 | struct btrfs_path *path; | |
285 | struct extent_buffer *leaf; | |
286 | struct btrfs_ordered_sum *sums; | |
287 | struct btrfs_sector_sum *sector_sum; | |
288 | struct btrfs_csum_item *item; | |
289 | unsigned long offset; | |
290 | int ret; | |
291 | size_t size; | |
292 | u64 csum_end; | |
293 | u16 csum_size = btrfs_super_csum_size(&root->fs_info->super_copy); | |
294 | ||
295 | path = btrfs_alloc_path(); | |
d8926bb3 MF |
296 | if (!path) |
297 | return -ENOMEM; | |
17d217fe | 298 | |
a2de733c AJ |
299 | if (search_commit) { |
300 | path->skip_locking = 1; | |
301 | path->reada = 2; | |
302 | path->search_commit_root = 1; | |
303 | } | |
304 | ||
17d217fe YZ |
305 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
306 | key.offset = start; | |
307 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
308 | ||
07d400a6 | 309 | ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); |
17d217fe YZ |
310 | if (ret < 0) |
311 | goto fail; | |
312 | if (ret > 0 && path->slots[0] > 0) { | |
313 | leaf = path->nodes[0]; | |
314 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0] - 1); | |
315 | if (key.objectid == BTRFS_EXTENT_CSUM_OBJECTID && | |
316 | key.type == BTRFS_EXTENT_CSUM_KEY) { | |
317 | offset = (start - key.offset) >> | |
318 | root->fs_info->sb->s_blocksize_bits; | |
319 | if (offset * csum_size < | |
320 | btrfs_item_size_nr(leaf, path->slots[0] - 1)) | |
321 | path->slots[0]--; | |
322 | } | |
323 | } | |
324 | ||
325 | while (start <= end) { | |
326 | leaf = path->nodes[0]; | |
327 | if (path->slots[0] >= btrfs_header_nritems(leaf)) { | |
07d400a6 | 328 | ret = btrfs_next_leaf(root, path); |
17d217fe YZ |
329 | if (ret < 0) |
330 | goto fail; | |
331 | if (ret > 0) | |
332 | break; | |
333 | leaf = path->nodes[0]; | |
334 | } | |
335 | ||
336 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
337 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
338 | key.type != BTRFS_EXTENT_CSUM_KEY) | |
339 | break; | |
340 | ||
341 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
342 | if (key.offset > end) | |
343 | break; | |
344 | ||
345 | if (key.offset > start) | |
346 | start = key.offset; | |
347 | ||
348 | size = btrfs_item_size_nr(leaf, path->slots[0]); | |
349 | csum_end = key.offset + (size / csum_size) * root->sectorsize; | |
87b29b20 YZ |
350 | if (csum_end <= start) { |
351 | path->slots[0]++; | |
352 | continue; | |
353 | } | |
17d217fe | 354 | |
07d400a6 | 355 | csum_end = min(csum_end, end + 1); |
17d217fe YZ |
356 | item = btrfs_item_ptr(path->nodes[0], path->slots[0], |
357 | struct btrfs_csum_item); | |
07d400a6 YZ |
358 | while (start < csum_end) { |
359 | size = min_t(size_t, csum_end - start, | |
360 | MAX_ORDERED_SUM_BYTES(root)); | |
361 | sums = kzalloc(btrfs_ordered_sum_size(root, size), | |
362 | GFP_NOFS); | |
363 | BUG_ON(!sums); | |
17d217fe | 364 | |
07d400a6 YZ |
365 | sector_sum = sums->sums; |
366 | sums->bytenr = start; | |
367 | sums->len = size; | |
368 | ||
369 | offset = (start - key.offset) >> | |
370 | root->fs_info->sb->s_blocksize_bits; | |
371 | offset *= csum_size; | |
372 | ||
373 | while (size > 0) { | |
374 | read_extent_buffer(path->nodes[0], | |
375 | §or_sum->sum, | |
376 | ((unsigned long)item) + | |
377 | offset, csum_size); | |
378 | sector_sum->bytenr = start; | |
379 | ||
380 | size -= root->sectorsize; | |
381 | start += root->sectorsize; | |
382 | offset += csum_size; | |
383 | sector_sum++; | |
384 | } | |
385 | list_add_tail(&sums->list, list); | |
386 | } | |
17d217fe YZ |
387 | path->slots[0]++; |
388 | } | |
389 | ret = 0; | |
390 | fail: | |
391 | btrfs_free_path(path); | |
392 | return ret; | |
393 | } | |
394 | ||
3edf7d33 | 395 | int btrfs_csum_one_bio(struct btrfs_root *root, struct inode *inode, |
d20f7043 | 396 | struct bio *bio, u64 file_start, int contig) |
e015640f | 397 | { |
e6dcd2dc CM |
398 | struct btrfs_ordered_sum *sums; |
399 | struct btrfs_sector_sum *sector_sum; | |
3edf7d33 | 400 | struct btrfs_ordered_extent *ordered; |
e015640f CM |
401 | char *data; |
402 | struct bio_vec *bvec = bio->bi_io_vec; | |
403 | int bio_index = 0; | |
3edf7d33 CM |
404 | unsigned long total_bytes = 0; |
405 | unsigned long this_sum_bytes = 0; | |
406 | u64 offset; | |
d20f7043 | 407 | u64 disk_bytenr; |
e015640f | 408 | |
e6dcd2dc CM |
409 | WARN_ON(bio->bi_vcnt <= 0); |
410 | sums = kzalloc(btrfs_ordered_sum_size(root, bio->bi_size), GFP_NOFS); | |
e015640f CM |
411 | if (!sums) |
412 | return -ENOMEM; | |
3edf7d33 | 413 | |
ed98b56a | 414 | sector_sum = sums->sums; |
d20f7043 | 415 | disk_bytenr = (u64)bio->bi_sector << 9; |
e6dcd2dc CM |
416 | sums->len = bio->bi_size; |
417 | INIT_LIST_HEAD(&sums->list); | |
d20f7043 CM |
418 | |
419 | if (contig) | |
420 | offset = file_start; | |
421 | else | |
422 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
423 | ||
424 | ordered = btrfs_lookup_ordered_extent(inode, offset); | |
3edf7d33 | 425 | BUG_ON(!ordered); |
d20f7043 | 426 | sums->bytenr = ordered->start; |
e015640f | 427 | |
d397712b | 428 | while (bio_index < bio->bi_vcnt) { |
d20f7043 CM |
429 | if (!contig) |
430 | offset = page_offset(bvec->bv_page) + bvec->bv_offset; | |
431 | ||
432 | if (!contig && (offset >= ordered->file_offset + ordered->len || | |
433 | offset < ordered->file_offset)) { | |
3edf7d33 CM |
434 | unsigned long bytes_left; |
435 | sums->len = this_sum_bytes; | |
436 | this_sum_bytes = 0; | |
437 | btrfs_add_ordered_sum(inode, ordered, sums); | |
438 | btrfs_put_ordered_extent(ordered); | |
439 | ||
440 | bytes_left = bio->bi_size - total_bytes; | |
441 | ||
442 | sums = kzalloc(btrfs_ordered_sum_size(root, bytes_left), | |
443 | GFP_NOFS); | |
444 | BUG_ON(!sums); | |
ed98b56a | 445 | sector_sum = sums->sums; |
3edf7d33 | 446 | sums->len = bytes_left; |
d20f7043 | 447 | ordered = btrfs_lookup_ordered_extent(inode, offset); |
3edf7d33 | 448 | BUG_ON(!ordered); |
d20f7043 | 449 | sums->bytenr = ordered->start; |
3edf7d33 CM |
450 | } |
451 | ||
e015640f | 452 | data = kmap_atomic(bvec->bv_page, KM_USER0); |
e6dcd2dc CM |
453 | sector_sum->sum = ~(u32)0; |
454 | sector_sum->sum = btrfs_csum_data(root, | |
455 | data + bvec->bv_offset, | |
456 | sector_sum->sum, | |
457 | bvec->bv_len); | |
e015640f | 458 | kunmap_atomic(data, KM_USER0); |
e6dcd2dc CM |
459 | btrfs_csum_final(sector_sum->sum, |
460 | (char *)§or_sum->sum); | |
d20f7043 | 461 | sector_sum->bytenr = disk_bytenr; |
ed98b56a | 462 | |
e6dcd2dc | 463 | sector_sum++; |
e015640f | 464 | bio_index++; |
3edf7d33 CM |
465 | total_bytes += bvec->bv_len; |
466 | this_sum_bytes += bvec->bv_len; | |
d20f7043 CM |
467 | disk_bytenr += bvec->bv_len; |
468 | offset += bvec->bv_len; | |
e015640f CM |
469 | bvec++; |
470 | } | |
ed98b56a | 471 | this_sum_bytes = 0; |
3edf7d33 CM |
472 | btrfs_add_ordered_sum(inode, ordered, sums); |
473 | btrfs_put_ordered_extent(ordered); | |
e015640f CM |
474 | return 0; |
475 | } | |
476 | ||
459931ec CM |
477 | /* |
478 | * helper function for csum removal, this expects the | |
479 | * key to describe the csum pointed to by the path, and it expects | |
480 | * the csum to overlap the range [bytenr, len] | |
481 | * | |
482 | * The csum should not be entirely contained in the range and the | |
483 | * range should not be entirely contained in the csum. | |
484 | * | |
485 | * This calls btrfs_truncate_item with the correct args based on the | |
486 | * overlap, and fixes up the key as required. | |
487 | */ | |
488 | static noinline int truncate_one_csum(struct btrfs_trans_handle *trans, | |
489 | struct btrfs_root *root, | |
490 | struct btrfs_path *path, | |
491 | struct btrfs_key *key, | |
492 | u64 bytenr, u64 len) | |
493 | { | |
494 | struct extent_buffer *leaf; | |
495 | u16 csum_size = | |
496 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
497 | u64 csum_end; | |
498 | u64 end_byte = bytenr + len; | |
499 | u32 blocksize_bits = root->fs_info->sb->s_blocksize_bits; | |
500 | int ret; | |
501 | ||
502 | leaf = path->nodes[0]; | |
503 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; | |
504 | csum_end <<= root->fs_info->sb->s_blocksize_bits; | |
505 | csum_end += key->offset; | |
506 | ||
507 | if (key->offset < bytenr && csum_end <= end_byte) { | |
508 | /* | |
509 | * [ bytenr - len ] | |
510 | * [ ] | |
511 | * [csum ] | |
512 | * A simple truncate off the end of the item | |
513 | */ | |
514 | u32 new_size = (bytenr - key->offset) >> blocksize_bits; | |
515 | new_size *= csum_size; | |
516 | ret = btrfs_truncate_item(trans, root, path, new_size, 1); | |
459931ec CM |
517 | } else if (key->offset >= bytenr && csum_end > end_byte && |
518 | end_byte > key->offset) { | |
519 | /* | |
520 | * [ bytenr - len ] | |
521 | * [ ] | |
522 | * [csum ] | |
523 | * we need to truncate from the beginning of the csum | |
524 | */ | |
525 | u32 new_size = (csum_end - end_byte) >> blocksize_bits; | |
526 | new_size *= csum_size; | |
527 | ||
528 | ret = btrfs_truncate_item(trans, root, path, new_size, 0); | |
459931ec CM |
529 | |
530 | key->offset = end_byte; | |
531 | ret = btrfs_set_item_key_safe(trans, root, path, key); | |
532 | BUG_ON(ret); | |
533 | } else { | |
534 | BUG(); | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | ||
539 | /* | |
540 | * deletes the csum items from the csum tree for a given | |
541 | * range of bytes. | |
542 | */ | |
543 | int btrfs_del_csums(struct btrfs_trans_handle *trans, | |
544 | struct btrfs_root *root, u64 bytenr, u64 len) | |
545 | { | |
546 | struct btrfs_path *path; | |
547 | struct btrfs_key key; | |
548 | u64 end_byte = bytenr + len; | |
549 | u64 csum_end; | |
550 | struct extent_buffer *leaf; | |
551 | int ret; | |
552 | u16 csum_size = | |
553 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
554 | int blocksize_bits = root->fs_info->sb->s_blocksize_bits; | |
555 | ||
556 | root = root->fs_info->csum_root; | |
557 | ||
558 | path = btrfs_alloc_path(); | |
2a29edc6 | 559 | if (!path) |
560 | return -ENOMEM; | |
459931ec | 561 | |
d397712b | 562 | while (1) { |
459931ec CM |
563 | key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
564 | key.offset = end_byte - 1; | |
565 | key.type = BTRFS_EXTENT_CSUM_KEY; | |
566 | ||
b9473439 | 567 | path->leave_spinning = 1; |
459931ec CM |
568 | ret = btrfs_search_slot(trans, root, &key, path, -1, 1); |
569 | if (ret > 0) { | |
570 | if (path->slots[0] == 0) | |
65a246c5 | 571 | break; |
459931ec | 572 | path->slots[0]--; |
ad0397a7 | 573 | } else if (ret < 0) { |
65a246c5 | 574 | break; |
459931ec | 575 | } |
ad0397a7 | 576 | |
459931ec CM |
577 | leaf = path->nodes[0]; |
578 | btrfs_item_key_to_cpu(leaf, &key, path->slots[0]); | |
579 | ||
580 | if (key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
581 | key.type != BTRFS_EXTENT_CSUM_KEY) { | |
582 | break; | |
583 | } | |
584 | ||
585 | if (key.offset >= end_byte) | |
586 | break; | |
587 | ||
588 | csum_end = btrfs_item_size_nr(leaf, path->slots[0]) / csum_size; | |
589 | csum_end <<= blocksize_bits; | |
590 | csum_end += key.offset; | |
591 | ||
592 | /* this csum ends before we start, we're done */ | |
593 | if (csum_end <= bytenr) | |
594 | break; | |
595 | ||
596 | /* delete the entire item, it is inside our range */ | |
597 | if (key.offset >= bytenr && csum_end <= end_byte) { | |
598 | ret = btrfs_del_item(trans, root, path); | |
65a246c5 TI |
599 | if (ret) |
600 | goto out; | |
dcbdd4dc CM |
601 | if (key.offset == bytenr) |
602 | break; | |
459931ec CM |
603 | } else if (key.offset < bytenr && csum_end > end_byte) { |
604 | unsigned long offset; | |
605 | unsigned long shift_len; | |
606 | unsigned long item_offset; | |
607 | /* | |
608 | * [ bytenr - len ] | |
609 | * [csum ] | |
610 | * | |
611 | * Our bytes are in the middle of the csum, | |
612 | * we need to split this item and insert a new one. | |
613 | * | |
614 | * But we can't drop the path because the | |
615 | * csum could change, get removed, extended etc. | |
616 | * | |
617 | * The trick here is the max size of a csum item leaves | |
618 | * enough room in the tree block for a single | |
619 | * item header. So, we split the item in place, | |
620 | * adding a new header pointing to the existing | |
621 | * bytes. Then we loop around again and we have | |
622 | * a nicely formed csum item that we can neatly | |
623 | * truncate. | |
624 | */ | |
625 | offset = (bytenr - key.offset) >> blocksize_bits; | |
626 | offset *= csum_size; | |
627 | ||
628 | shift_len = (len >> blocksize_bits) * csum_size; | |
629 | ||
630 | item_offset = btrfs_item_ptr_offset(leaf, | |
631 | path->slots[0]); | |
632 | ||
633 | memset_extent_buffer(leaf, 0, item_offset + offset, | |
634 | shift_len); | |
635 | key.offset = bytenr; | |
636 | ||
637 | /* | |
638 | * btrfs_split_item returns -EAGAIN when the | |
639 | * item changed size or key | |
640 | */ | |
641 | ret = btrfs_split_item(trans, root, path, &key, offset); | |
642 | BUG_ON(ret && ret != -EAGAIN); | |
643 | ||
644 | key.offset = end_byte - 1; | |
645 | } else { | |
646 | ret = truncate_one_csum(trans, root, path, | |
647 | &key, bytenr, len); | |
648 | BUG_ON(ret); | |
dcbdd4dc CM |
649 | if (key.offset < bytenr) |
650 | break; | |
459931ec | 651 | } |
b3b4aa74 | 652 | btrfs_release_path(path); |
459931ec | 653 | } |
65a246c5 | 654 | ret = 0; |
459931ec CM |
655 | out: |
656 | btrfs_free_path(path); | |
65a246c5 | 657 | return ret; |
459931ec CM |
658 | } |
659 | ||
065631f6 | 660 | int btrfs_csum_file_blocks(struct btrfs_trans_handle *trans, |
d20f7043 | 661 | struct btrfs_root *root, |
e6dcd2dc | 662 | struct btrfs_ordered_sum *sums) |
f254e52c | 663 | { |
d20f7043 | 664 | u64 bytenr; |
f254e52c CM |
665 | int ret; |
666 | struct btrfs_key file_key; | |
6567e837 | 667 | struct btrfs_key found_key; |
065631f6 | 668 | u64 next_offset; |
e6dcd2dc | 669 | u64 total_bytes = 0; |
065631f6 | 670 | int found_next; |
5caf2a00 | 671 | struct btrfs_path *path; |
f254e52c | 672 | struct btrfs_csum_item *item; |
065631f6 | 673 | struct btrfs_csum_item *item_end; |
ff79f819 | 674 | struct extent_buffer *leaf = NULL; |
6567e837 | 675 | u64 csum_offset; |
e6dcd2dc | 676 | struct btrfs_sector_sum *sector_sum; |
f578d4bd CM |
677 | u32 nritems; |
678 | u32 ins_size; | |
607d432d JB |
679 | u16 csum_size = |
680 | btrfs_super_csum_size(&root->fs_info->super_copy); | |
6e92f5e6 | 681 | |
5caf2a00 | 682 | path = btrfs_alloc_path(); |
d8926bb3 MF |
683 | if (!path) |
684 | return -ENOMEM; | |
685 | ||
ed98b56a | 686 | sector_sum = sums->sums; |
065631f6 CM |
687 | again: |
688 | next_offset = (u64)-1; | |
689 | found_next = 0; | |
d20f7043 CM |
690 | file_key.objectid = BTRFS_EXTENT_CSUM_OBJECTID; |
691 | file_key.offset = sector_sum->bytenr; | |
692 | bytenr = sector_sum->bytenr; | |
693 | btrfs_set_key_type(&file_key, BTRFS_EXTENT_CSUM_KEY); | |
a429e513 | 694 | |
d20f7043 | 695 | item = btrfs_lookup_csum(trans, root, path, sector_sum->bytenr, 1); |
ff79f819 CM |
696 | if (!IS_ERR(item)) { |
697 | leaf = path->nodes[0]; | |
639cb586 | 698 | ret = 0; |
a429e513 | 699 | goto found; |
ff79f819 | 700 | } |
a429e513 | 701 | ret = PTR_ERR(item); |
4a500fd1 YZ |
702 | if (ret != -EFBIG && ret != -ENOENT) |
703 | goto fail_unlock; | |
704 | ||
a429e513 CM |
705 | if (ret == -EFBIG) { |
706 | u32 item_size; | |
707 | /* we found one, but it isn't big enough yet */ | |
5f39d397 CM |
708 | leaf = path->nodes[0]; |
709 | item_size = btrfs_item_size_nr(leaf, path->slots[0]); | |
607d432d JB |
710 | if ((item_size / csum_size) >= |
711 | MAX_CSUM_ITEMS(root, csum_size)) { | |
a429e513 CM |
712 | /* already at max size, make a new one */ |
713 | goto insert; | |
714 | } | |
715 | } else { | |
f578d4bd | 716 | int slot = path->slots[0] + 1; |
a429e513 | 717 | /* we didn't find a csum item, insert one */ |
f578d4bd CM |
718 | nritems = btrfs_header_nritems(path->nodes[0]); |
719 | if (path->slots[0] >= nritems - 1) { | |
720 | ret = btrfs_next_leaf(root, path); | |
b56baf5b | 721 | if (ret == 1) |
f578d4bd | 722 | found_next = 1; |
b56baf5b | 723 | if (ret != 0) |
f578d4bd | 724 | goto insert; |
b56baf5b | 725 | slot = 0; |
f578d4bd CM |
726 | } |
727 | btrfs_item_key_to_cpu(path->nodes[0], &found_key, slot); | |
d20f7043 CM |
728 | if (found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || |
729 | found_key.type != BTRFS_EXTENT_CSUM_KEY) { | |
f578d4bd CM |
730 | found_next = 1; |
731 | goto insert; | |
732 | } | |
733 | next_offset = found_key.offset; | |
734 | found_next = 1; | |
a429e513 CM |
735 | goto insert; |
736 | } | |
737 | ||
738 | /* | |
739 | * at this point, we know the tree has an item, but it isn't big | |
740 | * enough yet to put our csum in. Grow it | |
741 | */ | |
b3b4aa74 | 742 | btrfs_release_path(path); |
6567e837 | 743 | ret = btrfs_search_slot(trans, root, &file_key, path, |
607d432d | 744 | csum_size, 1); |
6567e837 | 745 | if (ret < 0) |
53863232 | 746 | goto fail_unlock; |
459931ec CM |
747 | |
748 | if (ret > 0) { | |
749 | if (path->slots[0] == 0) | |
750 | goto insert; | |
751 | path->slots[0]--; | |
6567e837 | 752 | } |
459931ec | 753 | |
5f39d397 CM |
754 | leaf = path->nodes[0]; |
755 | btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]); | |
d20f7043 | 756 | csum_offset = (bytenr - found_key.offset) >> |
6567e837 | 757 | root->fs_info->sb->s_blocksize_bits; |
459931ec | 758 | |
d20f7043 CM |
759 | if (btrfs_key_type(&found_key) != BTRFS_EXTENT_CSUM_KEY || |
760 | found_key.objectid != BTRFS_EXTENT_CSUM_OBJECTID || | |
607d432d | 761 | csum_offset >= MAX_CSUM_ITEMS(root, csum_size)) { |
6567e837 CM |
762 | goto insert; |
763 | } | |
459931ec | 764 | |
5f39d397 | 765 | if (csum_offset >= btrfs_item_size_nr(leaf, path->slots[0]) / |
607d432d JB |
766 | csum_size) { |
767 | u32 diff = (csum_offset + 1) * csum_size; | |
459931ec CM |
768 | |
769 | /* | |
770 | * is the item big enough already? we dropped our lock | |
771 | * before and need to recheck | |
772 | */ | |
773 | if (diff < btrfs_item_size_nr(leaf, path->slots[0])) | |
774 | goto csum; | |
775 | ||
5f39d397 | 776 | diff = diff - btrfs_item_size_nr(leaf, path->slots[0]); |
d397712b | 777 | if (diff != csum_size) |
3a686375 | 778 | goto insert; |
459931ec | 779 | |
a429e513 | 780 | ret = btrfs_extend_item(trans, root, path, diff); |
6567e837 CM |
781 | goto csum; |
782 | } | |
783 | ||
784 | insert: | |
b3b4aa74 | 785 | btrfs_release_path(path); |
6567e837 | 786 | csum_offset = 0; |
f578d4bd | 787 | if (found_next) { |
d20f7043 CM |
788 | u64 tmp = total_bytes + root->sectorsize; |
789 | u64 next_sector = sector_sum->bytenr; | |
790 | struct btrfs_sector_sum *next = sector_sum + 1; | |
791 | ||
d397712b | 792 | while (tmp < sums->len) { |
d20f7043 CM |
793 | if (next_sector + root->sectorsize != next->bytenr) |
794 | break; | |
795 | tmp += root->sectorsize; | |
796 | next_sector = next->bytenr; | |
797 | next++; | |
798 | } | |
799 | tmp = min(tmp, next_offset - file_key.offset); | |
f578d4bd CM |
800 | tmp >>= root->fs_info->sb->s_blocksize_bits; |
801 | tmp = max((u64)1, tmp); | |
607d432d JB |
802 | tmp = min(tmp, (u64)MAX_CSUM_ITEMS(root, csum_size)); |
803 | ins_size = csum_size * tmp; | |
f578d4bd | 804 | } else { |
607d432d | 805 | ins_size = csum_size; |
f578d4bd | 806 | } |
b9473439 | 807 | path->leave_spinning = 1; |
5caf2a00 | 808 | ret = btrfs_insert_empty_item(trans, root, path, &file_key, |
f578d4bd | 809 | ins_size); |
b9473439 | 810 | path->leave_spinning = 0; |
54aa1f4d | 811 | if (ret < 0) |
53863232 | 812 | goto fail_unlock; |
a429e513 | 813 | if (ret != 0) { |
a429e513 | 814 | WARN_ON(1); |
53863232 | 815 | goto fail_unlock; |
a429e513 | 816 | } |
6567e837 | 817 | csum: |
5f39d397 CM |
818 | leaf = path->nodes[0]; |
819 | item = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); | |
f254e52c | 820 | ret = 0; |
509659cd | 821 | item = (struct btrfs_csum_item *)((unsigned char *)item + |
607d432d | 822 | csum_offset * csum_size); |
b18c6685 | 823 | found: |
065631f6 CM |
824 | item_end = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_csum_item); |
825 | item_end = (struct btrfs_csum_item *)((unsigned char *)item_end + | |
826 | btrfs_item_size_nr(leaf, path->slots[0])); | |
e6dcd2dc | 827 | next_sector: |
aadfeb6e | 828 | |
a6591715 | 829 | write_extent_buffer(leaf, §or_sum->sum, (unsigned long)item, csum_size); |
7f3c74fb | 830 | |
e6dcd2dc CM |
831 | total_bytes += root->sectorsize; |
832 | sector_sum++; | |
833 | if (total_bytes < sums->len) { | |
6e92f5e6 | 834 | item = (struct btrfs_csum_item *)((char *)item + |
607d432d | 835 | csum_size); |
d20f7043 CM |
836 | if (item < item_end && bytenr + PAGE_CACHE_SIZE == |
837 | sector_sum->bytenr) { | |
838 | bytenr = sector_sum->bytenr; | |
e6dcd2dc | 839 | goto next_sector; |
2e1a992e | 840 | } |
065631f6 | 841 | } |
a6591715 | 842 | |
5caf2a00 | 843 | btrfs_mark_buffer_dirty(path->nodes[0]); |
e6dcd2dc | 844 | if (total_bytes < sums->len) { |
b3b4aa74 | 845 | btrfs_release_path(path); |
b9473439 | 846 | cond_resched(); |
065631f6 CM |
847 | goto again; |
848 | } | |
53863232 | 849 | out: |
5caf2a00 | 850 | btrfs_free_path(path); |
f254e52c | 851 | return ret; |
53863232 CM |
852 | |
853 | fail_unlock: | |
53863232 | 854 | goto out; |
f254e52c | 855 | } |