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