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fs: btrfs: Prevent error pointer dereference in list_subvolums()
[thirdparty/u-boot.git] / fs / btrfs / volumes.c
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b1f0067a
QW		 1// SPDX-License-Identifier: GPL-2.0+
2#include <stdlib.h>
3#include <common.h>
4#include <fs_internal.h>
5#include "ctree.h"
6#include "disk-io.h"
7#include "volumes.h"
57f24f10 8#include "extent-io.h"
b1f0067a
QW		 9
10const struct btrfs_raid_attr btrfs_raid_array[BTRFS_NR_RAID_TYPES] = {
11 [BTRFS_RAID_RAID10] = {
12 .sub_stripes = 2,
13 .dev_stripes = 1,
14 .devs_max = 0, /* 0 == as many as possible */
15 .devs_min = 4,
16 .tolerated_failures = 1,
17 .devs_increment = 2,
18 .ncopies = 2,
19 .nparity = 0,
20 .raid_name = "raid10",
21 .bg_flag = BTRFS_BLOCK_GROUP_RAID10,
22 },
23 [BTRFS_RAID_RAID1] = {
24 .sub_stripes = 1,
25 .dev_stripes = 1,
26 .devs_max = 2,
27 .devs_min = 2,
28 .tolerated_failures = 1,
29 .devs_increment = 2,
30 .ncopies = 2,
31 .nparity = 0,
32 .raid_name = "raid1",
33 .bg_flag = BTRFS_BLOCK_GROUP_RAID1,
34 },
35 [BTRFS_RAID_RAID1C3] = {
36 .sub_stripes = 1,
37 .dev_stripes = 1,
38 .devs_max = 3,
39 .devs_min = 3,
40 .tolerated_failures = 2,
41 .devs_increment = 3,
42 .ncopies = 3,
43 .raid_name = "raid1c3",
44 .bg_flag = BTRFS_BLOCK_GROUP_RAID1C3,
45 },
46 [BTRFS_RAID_RAID1C4] = {
47 .sub_stripes = 1,
48 .dev_stripes = 1,
49 .devs_max = 4,
50 .devs_min = 4,
51 .tolerated_failures = 3,
52 .devs_increment = 4,
53 .ncopies = 4,
54 .raid_name = "raid1c4",
55 .bg_flag = BTRFS_BLOCK_GROUP_RAID1C4,
56 },
57 [BTRFS_RAID_DUP] = {
58 .sub_stripes = 1,
59 .dev_stripes = 2,
60 .devs_max = 1,
61 .devs_min = 1,
62 .tolerated_failures = 0,
63 .devs_increment = 1,
64 .ncopies = 2,
65 .nparity = 0,
66 .raid_name = "dup",
67 .bg_flag = BTRFS_BLOCK_GROUP_DUP,
68 },
69 [BTRFS_RAID_RAID0] = {
70 .sub_stripes = 1,
71 .dev_stripes = 1,
72 .devs_max = 0,
73 .devs_min = 2,
74 .tolerated_failures = 0,
75 .devs_increment = 1,
76 .ncopies = 1,
77 .nparity = 0,
78 .raid_name = "raid0",
79 .bg_flag = BTRFS_BLOCK_GROUP_RAID0,
80 },
81 [BTRFS_RAID_SINGLE] = {
82 .sub_stripes = 1,
83 .dev_stripes = 1,
84 .devs_max = 1,
85 .devs_min = 1,
86 .tolerated_failures = 0,
87 .devs_increment = 1,
88 .ncopies = 1,
89 .nparity = 0,
90 .raid_name = "single",
91 .bg_flag = 0,
92 },
93 [BTRFS_RAID_RAID5] = {
94 .sub_stripes = 1,
95 .dev_stripes = 1,
96 .devs_max = 0,
97 .devs_min = 2,
98 .tolerated_failures = 1,
99 .devs_increment = 1,
100 .ncopies = 1,
101 .nparity = 1,
102 .raid_name = "raid5",
103 .bg_flag = BTRFS_BLOCK_GROUP_RAID5,
104 },
105 [BTRFS_RAID_RAID6] = {
106 .sub_stripes = 1,
107 .dev_stripes = 1,
108 .devs_max = 0,
109 .devs_min = 3,
110 .tolerated_failures = 2,
111 .devs_increment = 1,
112 .ncopies = 1,
113 .nparity = 2,
114 .raid_name = "raid6",
115 .bg_flag = BTRFS_BLOCK_GROUP_RAID6,
116 },
117};
118
119struct stripe {
120 struct btrfs_device *dev;
121 u64 physical;
122};
123
124static inline int nr_parity_stripes(struct map_lookup *map)
125{
126 if (map->type & BTRFS_BLOCK_GROUP_RAID5)
127 return 1;
128 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
129 return 2;
130 else
131 return 0;
132}
133
134static inline int nr_data_stripes(struct map_lookup *map)
135{
136 return map->num_stripes - nr_parity_stripes(map);
137}
138
139#define is_parity_stripe(x) ( ((x) == BTRFS_RAID5_P_STRIPE) || ((x) == BTRFS_RAID6_Q_STRIPE) )
140
141static LIST_HEAD(fs_uuids);
142
143/*
144 * Find a device specified by @devid or @uuid in the list of @fs_devices, or
145 * return NULL.
146 *
147 * If devid and uuid are both specified, the match must be exact, otherwise
148 * only devid is used.
149 */
150static struct btrfs_device *find_device(struct btrfs_fs_devices *fs_devices,
151 u64 devid, u8 *uuid)
152{
153 struct list_head *head = &fs_devices->devices;
154 struct btrfs_device *dev;
155
156 list_for_each_entry(dev, head, dev_list) {
157 if (dev->devid == devid &&
158 (!uuid || !memcmp(dev->uuid, uuid, BTRFS_UUID_SIZE))) {
159 return dev;
160 }
161 }
162 return NULL;
163}
164
165static struct btrfs_fs_devices *find_fsid(u8 *fsid, u8 *metadata_uuid)
166{
167 struct btrfs_fs_devices *fs_devices;
168
169 list_for_each_entry(fs_devices, &fs_uuids, list) {
170 if (metadata_uuid && (memcmp(fsid, fs_devices->fsid,
171 BTRFS_FSID_SIZE) == 0) &&
172 (memcmp(metadata_uuid, fs_devices->metadata_uuid,
173 BTRFS_FSID_SIZE) == 0)) {
174 return fs_devices;
175 } else if (memcmp(fsid, fs_devices->fsid, BTRFS_FSID_SIZE) == 0){
176 return fs_devices;
177 }
178 }
179 return NULL;
180}
181
182static int device_list_add(struct btrfs_super_block *disk_super,
183 u64 devid, struct blk_desc *desc,
184 struct disk_partition *part,
185 struct btrfs_fs_devices **fs_devices_ret)
186{
187 struct btrfs_device *device;
188 struct btrfs_fs_devices *fs_devices;
189 u64 found_transid = btrfs_super_generation(disk_super);
190 bool metadata_uuid = (btrfs_super_incompat_flags(disk_super) &
191 BTRFS_FEATURE_INCOMPAT_METADATA_UUID);
192
193 if (metadata_uuid)
194 fs_devices = find_fsid(disk_super->fsid,
195 disk_super->metadata_uuid);
196 else
197 fs_devices = find_fsid(disk_super->fsid, NULL);
198
199 if (!fs_devices) {
200 fs_devices = kzalloc(sizeof(*fs_devices), GFP_NOFS);
201 if (!fs_devices)
202 return -ENOMEM;
203 INIT_LIST_HEAD(&fs_devices->devices);
204 list_add(&fs_devices->list, &fs_uuids);
205 memcpy(fs_devices->fsid, disk_super->fsid, BTRFS_FSID_SIZE);
206 if (metadata_uuid)
207 memcpy(fs_devices->metadata_uuid,
208 disk_super->metadata_uuid, BTRFS_FSID_SIZE);
209 else
210 memcpy(fs_devices->metadata_uuid, fs_devices->fsid,
211 BTRFS_FSID_SIZE);
212
213 fs_devices->latest_devid = devid;
214 fs_devices->latest_trans = found_transid;
215 fs_devices->lowest_devid = (u64)-1;
216 device = NULL;
217 } else {
218 device = find_device(fs_devices, devid,
219 disk_super->dev_item.uuid);
220 }
221 if (!device) {
222 device = kzalloc(sizeof(*device), GFP_NOFS);
223 if (!device) {
224 /* we can safely leave the fs_devices entry around */
225 return -ENOMEM;
226 }
227 device->devid = devid;
228 device->desc = desc;
229 device->part = part;
230 device->generation = found_transid;
231 memcpy(device->uuid, disk_super->dev_item.uuid,
232 BTRFS_UUID_SIZE);
233 device->total_devs = btrfs_super_num_devices(disk_super);
234 device->super_bytes_used = btrfs_super_bytes_used(disk_super);
235 device->total_bytes =
236 btrfs_stack_device_total_bytes(&disk_super->dev_item);
237 device->bytes_used =
238 btrfs_stack_device_bytes_used(&disk_super->dev_item);
239 list_add(&device->dev_list, &fs_devices->devices);
240 device->fs_devices = fs_devices;
241 } else if (!device->desc || !device->part) {
242 /*
243 * The existing device has newer generation, so this one could
244 * be a stale one, don't add it.
245 */
246 if (found_transid < device->generation) {
247 error(
248 "adding devid %llu gen %llu but found an existing device gen %llu",
249 device->devid, found_transid,
250 device->generation);
251 return -EEXIST;
252 } else {
253 device->desc = desc;
254 device->part = part;
255 }
256 }
257
258
259 if (found_transid > fs_devices->latest_trans) {
260 fs_devices->latest_devid = devid;
261 fs_devices->latest_trans = found_transid;
262 }
263 if (fs_devices->lowest_devid > devid) {
264 fs_devices->lowest_devid = devid;
265 }
266 *fs_devices_ret = fs_devices;
267 return 0;
268}
269
270int btrfs_close_devices(struct btrfs_fs_devices *fs_devices)
271{
272 struct btrfs_fs_devices *seed_devices;
273 struct btrfs_device *device;
274 int ret = 0;
275
276again:
277 if (!fs_devices)
278 return 0;
279 while (!list_empty(&fs_devices->devices)) {
280 device = list_entry(fs_devices->devices.next,
281 struct btrfs_device, dev_list);
282 list_del(&device->dev_list);
283 /* free the memory */
284 free(device);
285 }
286
287 seed_devices = fs_devices->seed;
288 fs_devices->seed = NULL;
289 if (seed_devices) {
290 struct btrfs_fs_devices *orig;
291
292 orig = fs_devices;
293 fs_devices = seed_devices;
294 list_del(&orig->list);
295 free(orig);
296 goto again;
297 } else {
298 list_del(&fs_devices->list);
299 free(fs_devices);
300 }
301
302 return ret;
303}
304
305void btrfs_close_all_devices(void)
306{
307 struct btrfs_fs_devices *fs_devices;
308
309 while (!list_empty(&fs_uuids)) {
310 fs_devices = list_entry(fs_uuids.next, struct btrfs_fs_devices,
311 list);
312 btrfs_close_devices(fs_devices);
313 }
314}
315
316int btrfs_open_devices(struct btrfs_fs_devices *fs_devices)
317{
318 struct btrfs_device *device;
319
320 list_for_each_entry(device, &fs_devices->devices, dev_list) {
321 if (!device->desc || !device->part) {
322 printf("no device found for devid %llu, skip it \n",
323 device->devid);
324 continue;
325 }
326 }
327 return 0;
328}
329
330int btrfs_scan_one_device(struct blk_desc *desc, struct disk_partition *part,
331 struct btrfs_fs_devices **fs_devices_ret,
332 u64 *total_devs)
333{
334 struct btrfs_super_block *disk_super;
335 char buf[BTRFS_SUPER_INFO_SIZE];
336 int ret;
337 u64 devid;
338
339 disk_super = (struct btrfs_super_block *)buf;
340 ret = btrfs_read_dev_super(desc, part, disk_super);
341 if (ret < 0)
342 return -EIO;
343 devid = btrfs_stack_device_id(&disk_super->dev_item);
344 if (btrfs_super_flags(disk_super) & BTRFS_SUPER_FLAG_METADUMP)
345 *total_devs = 1;
346 else
347 *total_devs = btrfs_super_num_devices(disk_super);
348
349 ret = device_list_add(disk_super, devid, desc, part, fs_devices_ret);
350
351 return ret;
352}
353
354struct btrfs_device *btrfs_find_device(struct btrfs_fs_info *fs_info, u64 devid,
355 u8 *uuid, u8 *fsid)
356{
357 struct btrfs_device *device;
358 struct btrfs_fs_devices *cur_devices;
359
360 cur_devices = fs_info->fs_devices;
361 while (cur_devices) {
362 if (!fsid ||
363 !memcmp(cur_devices->metadata_uuid, fsid, BTRFS_FSID_SIZE)) {
364 device = find_device(cur_devices, devid, uuid);
365 if (device)
366 return device;
367 }
368 cur_devices = cur_devices->seed;
369 }
370 return NULL;
371}
372
57f24f10
QW		 373static struct btrfs_device *fill_missing_device(u64 devid)
374{
375 struct btrfs_device *device;
376
377 device = kzalloc(sizeof(*device), GFP_NOFS);
378 return device;
379}
380
b1f0067a
QW		 381/*
382 * slot == -1: SYSTEM chunk
383 * return -EIO on error, otherwise return 0
384 */
385int btrfs_check_chunk_valid(struct btrfs_fs_info *fs_info,
386 struct extent_buffer *leaf,
387 struct btrfs_chunk *chunk,
388 int slot, u64 logical)
389{
390 u64 length;
391 u64 stripe_len;
392 u16 num_stripes;
393 u16 sub_stripes;
394 u64 type;
395 u32 chunk_ondisk_size;
396 u32 sectorsize = fs_info->sectorsize;
397
398 /*
399 * Basic chunk item size check. Note that btrfs_chunk already contains
400 * one stripe, so no "==" check.
401 */
402 if (slot >= 0 &&
403 btrfs_item_size_nr(leaf, slot) < sizeof(struct btrfs_chunk)) {
404 error("invalid chunk item size, have %u expect [%zu, %zu)",
405 btrfs_item_size_nr(leaf, slot),
406 sizeof(struct btrfs_chunk),
407 BTRFS_LEAF_DATA_SIZE(fs_info));
408 return -EUCLEAN;
409 }
410 length = btrfs_chunk_length(leaf, chunk);
411 stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
412 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
413 sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
414 type = btrfs_chunk_type(leaf, chunk);
415
416 if (num_stripes == 0) {
417 error("invalid num_stripes, have %u expect non-zero",
418 num_stripes);
419 return -EUCLEAN;
420 }
421 if (slot >= 0 && btrfs_chunk_item_size(num_stripes) !=
422 btrfs_item_size_nr(leaf, slot)) {
423 error("invalid chunk item size, have %u expect %lu",
424 btrfs_item_size_nr(leaf, slot),
425 btrfs_chunk_item_size(num_stripes));
426 return -EUCLEAN;
427 }
428
429 /*
430 * These valid checks may be insufficient to cover every corner cases.
431 */
432 if (!IS_ALIGNED(logical, sectorsize)) {
433 error("invalid chunk logical %llu", logical);
434 return -EIO;
435 }
436 if (btrfs_chunk_sector_size(leaf, chunk) != sectorsize) {
437 error("invalid chunk sectorsize %llu",
438 (unsigned long long)btrfs_chunk_sector_size(leaf, chunk));
439 return -EIO;
440 }
441 if (!length || !IS_ALIGNED(length, sectorsize)) {
442 error("invalid chunk length %llu", length);
443 return -EIO;
444 }
445 if (stripe_len != BTRFS_STRIPE_LEN) {
446 error("invalid chunk stripe length: %llu", stripe_len);
447 return -EIO;
448 }
449 /* Check on chunk item type */
450 if (slot == -1 && (type & BTRFS_BLOCK_GROUP_SYSTEM) == 0) {
451 error("invalid chunk type %llu", type);
452 return -EIO;
453 }
454 if (type & ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
455 BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
456 error("unrecognized chunk type: %llu",
457 ~(BTRFS_BLOCK_GROUP_TYPE_MASK |
458 BTRFS_BLOCK_GROUP_PROFILE_MASK) & type);
459 return -EIO;
460 }
461 if (!(type & BTRFS_BLOCK_GROUP_TYPE_MASK)) {
462 error("missing chunk type flag: %llu", type);
463 return -EIO;
464 }
465 if (!(is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK) ||
466 (type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0)) {
467 error("conflicting chunk type detected: %llu", type);
468 return -EIO;
469 }
470 if ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
471 !is_power_of_2(type & BTRFS_BLOCK_GROUP_PROFILE_MASK)) {
472 error("conflicting chunk profile detected: %llu", type);
473 return -EIO;
474 }
475
476 chunk_ondisk_size = btrfs_chunk_item_size(num_stripes);
477 /*
478 * Btrfs_chunk contains at least one stripe, and for sys_chunk
479 * it can't exceed the system chunk array size
480 * For normal chunk, it should match its chunk item size.
481 */
482 if (num_stripes < 1 ||
483 (slot == -1 && chunk_ondisk_size > BTRFS_SYSTEM_CHUNK_ARRAY_SIZE) ||
484 (slot >= 0 && chunk_ondisk_size > btrfs_item_size_nr(leaf, slot))) {
485 error("invalid num_stripes: %u", num_stripes);
486 return -EIO;
487 }
488 /*
489 * Device number check against profile
490 */
491 if ((type & BTRFS_BLOCK_GROUP_RAID10 && (sub_stripes != 2 ||
492 !IS_ALIGNED(num_stripes, sub_stripes))) ||
493 (type & BTRFS_BLOCK_GROUP_RAID1 && num_stripes < 1) ||
494 (type & BTRFS_BLOCK_GROUP_RAID1C3 && num_stripes < 3) ||
495 (type & BTRFS_BLOCK_GROUP_RAID1C4 && num_stripes < 4) ||
496 (type & BTRFS_BLOCK_GROUP_RAID5 && num_stripes < 2) ||
497 (type & BTRFS_BLOCK_GROUP_RAID6 && num_stripes < 3) ||
498 (type & BTRFS_BLOCK_GROUP_DUP && num_stripes > 2) ||
499 ((type & BTRFS_BLOCK_GROUP_PROFILE_MASK) == 0 &&
500 num_stripes != 1)) {
501 error("Invalid num_stripes:sub_stripes %u:%u for profile %llu",
502 num_stripes, sub_stripes,
503 type & BTRFS_BLOCK_GROUP_PROFILE_MASK);
504 return -EIO;
505 }
506
507 return 0;
508}
509
57f24f10
QW		 510/*
511 * Slot is used to verify the chunk item is valid
512 *
513 * For sys chunk in superblock, pass -1 to indicate sys chunk.
514 */
515static int read_one_chunk(struct btrfs_fs_info *fs_info, struct btrfs_key *key,
516 struct extent_buffer *leaf,
517 struct btrfs_chunk *chunk, int slot)
518{
519 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
520 struct map_lookup *map;
521 struct cache_extent *ce;
522 u64 logical;
523 u64 length;
524 u64 devid;
525 u8 uuid[BTRFS_UUID_SIZE];
526 int num_stripes;
527 int ret;
528 int i;
529
530 logical = key->offset;
531 length = btrfs_chunk_length(leaf, chunk);
532 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
533 /* Validation check */
534 ret = btrfs_check_chunk_valid(fs_info, leaf, chunk, slot, logical);
535 if (ret) {
536 error("%s checksums match, but it has an invalid chunk, %s",
537 (slot == -1) ? "Superblock" : "Metadata",
538 (slot == -1) ? "try btrfsck --repair -s <superblock> ie, 0,1,2" : "");
539 return ret;
540 }
541
542 ce = search_cache_extent(&map_tree->cache_tree, logical);
543
544 /* already mapped? */
545 if (ce && ce->start <= logical && ce->start + ce->size > logical) {
546 return 0;
547 }
548
549 map = kmalloc(btrfs_map_lookup_size(num_stripes), GFP_NOFS);
550 if (!map)
551 return -ENOMEM;
552
553 map->ce.start = logical;
554 map->ce.size = length;
555 map->num_stripes = num_stripes;
556 map->io_width = btrfs_chunk_io_width(leaf, chunk);
557 map->io_align = btrfs_chunk_io_align(leaf, chunk);
558 map->sector_size = btrfs_chunk_sector_size(leaf, chunk);
559 map->stripe_len = btrfs_chunk_stripe_len(leaf, chunk);
560 map->type = btrfs_chunk_type(leaf, chunk);
561 map->sub_stripes = btrfs_chunk_sub_stripes(leaf, chunk);
562
563 for (i = 0; i < num_stripes; i++) {
564 map->stripes[i].physical =
565 btrfs_stripe_offset_nr(leaf, chunk, i);
566 devid = btrfs_stripe_devid_nr(leaf, chunk, i);
567 read_extent_buffer(leaf, uuid, (unsigned long)
568 btrfs_stripe_dev_uuid_nr(chunk, i),
569 BTRFS_UUID_SIZE);
570 map->stripes[i].dev = btrfs_find_device(fs_info, devid, uuid,
571 NULL);
572 if (!map->stripes[i].dev) {
573 map->stripes[i].dev = fill_missing_device(devid);
574 printf("warning, device %llu is missing\n",
575 (unsigned long long)devid);
576 list_add(&map->stripes[i].dev->dev_list,
577 &fs_info->fs_devices->devices);
578 }
579
580 }
581 ret = insert_cache_extent(&map_tree->cache_tree, &map->ce);
582 if (ret < 0) {
583 errno = -ret;
584 error("failed to add chunk map start=%llu len=%llu: %d (%m)",
585 map->ce.start, map->ce.size, ret);
586 }
587
588 return ret;
589}
590
591static int fill_device_from_item(struct extent_buffer *leaf,
592 struct btrfs_dev_item *dev_item,
593 struct btrfs_device *device)
594{
595 unsigned long ptr;
596
597 device->devid = btrfs_device_id(leaf, dev_item);
598 device->total_bytes = btrfs_device_total_bytes(leaf, dev_item);
599 device->bytes_used = btrfs_device_bytes_used(leaf, dev_item);
600 device->type = btrfs_device_type(leaf, dev_item);
601 device->io_align = btrfs_device_io_align(leaf, dev_item);
602 device->io_width = btrfs_device_io_width(leaf, dev_item);
603 device->sector_size = btrfs_device_sector_size(leaf, dev_item);
604
605 ptr = (unsigned long)btrfs_device_uuid(dev_item);
606 read_extent_buffer(leaf, device->uuid, ptr, BTRFS_UUID_SIZE);
607
608 return 0;
609}
610
611static int read_one_dev(struct btrfs_fs_info *fs_info,
612 struct extent_buffer *leaf,
613 struct btrfs_dev_item *dev_item)
614{
615 struct btrfs_device *device;
616 u64 devid;
617 int ret = 0;
618 u8 fs_uuid[BTRFS_UUID_SIZE];
619 u8 dev_uuid[BTRFS_UUID_SIZE];
620
621 devid = btrfs_device_id(leaf, dev_item);
622 read_extent_buffer(leaf, dev_uuid,
623 (unsigned long)btrfs_device_uuid(dev_item),
624 BTRFS_UUID_SIZE);
625 read_extent_buffer(leaf, fs_uuid,
626 (unsigned long)btrfs_device_fsid(dev_item),
627 BTRFS_FSID_SIZE);
628
629 if (memcmp(fs_uuid, fs_info->fs_devices->fsid, BTRFS_UUID_SIZE)) {
630 error("Seed device is not yet supported\n");
631 return -ENOTSUPP;
632 }
633
634 device = btrfs_find_device(fs_info, devid, dev_uuid, fs_uuid);
635 if (!device) {
636 device = kzalloc(sizeof(*device), GFP_NOFS);
637 if (!device)
638 return -ENOMEM;
639 list_add(&device->dev_list,
640 &fs_info->fs_devices->devices);
641 }
642
643 fill_device_from_item(leaf, dev_item, device);
644 fs_info->fs_devices->total_rw_bytes +=
645 btrfs_device_total_bytes(leaf, dev_item);
646 return ret;
647}
648
649int btrfs_read_sys_array(struct btrfs_fs_info *fs_info)
650{
651 struct btrfs_super_block *super_copy = fs_info->super_copy;
652 struct extent_buffer *sb;
653 struct btrfs_disk_key *disk_key;
654 struct btrfs_chunk *chunk;
655 u8 *array_ptr;
656 unsigned long sb_array_offset;
657 int ret = 0;
658 u32 num_stripes;
659 u32 array_size;
660 u32 len = 0;
661 u32 cur_offset;
662 struct btrfs_key key;
663
664 if (fs_info->nodesize < BTRFS_SUPER_INFO_SIZE) {
665 printf("ERROR: nodesize %u too small to read superblock\n",
666 fs_info->nodesize);
667 return -EINVAL;
668 }
669 sb = alloc_dummy_extent_buffer(fs_info, BTRFS_SUPER_INFO_OFFSET,
670 BTRFS_SUPER_INFO_SIZE);
671 if (!sb)
672 return -ENOMEM;
673 btrfs_set_buffer_uptodate(sb);
674 write_extent_buffer(sb, super_copy, 0, sizeof(*super_copy));
675 array_size = btrfs_super_sys_array_size(super_copy);
676
677 array_ptr = super_copy->sys_chunk_array;
678 sb_array_offset = offsetof(struct btrfs_super_block, sys_chunk_array);
679 cur_offset = 0;
680
681 while (cur_offset < array_size) {
682 disk_key = (struct btrfs_disk_key *)array_ptr;
683 len = sizeof(*disk_key);
684 if (cur_offset + len > array_size)
685 goto out_short_read;
686
687 btrfs_disk_key_to_cpu(&key, disk_key);
688
689 array_ptr += len;
690 sb_array_offset += len;
691 cur_offset += len;
692
693 if (key.type == BTRFS_CHUNK_ITEM_KEY) {
694 chunk = (struct btrfs_chunk *)sb_array_offset;
695 /*
696 * At least one btrfs_chunk with one stripe must be
697 * present, exact stripe count check comes afterwards
698 */
699 len = btrfs_chunk_item_size(1);
700 if (cur_offset + len > array_size)
701 goto out_short_read;
702
703 num_stripes = btrfs_chunk_num_stripes(sb, chunk);
704 if (!num_stripes) {
705 printk(
706 "ERROR: invalid number of stripes %u in sys_array at offset %u\n",
707 num_stripes, cur_offset);
708 ret = -EIO;
709 break;
710 }
711
712 len = btrfs_chunk_item_size(num_stripes);
713 if (cur_offset + len > array_size)
714 goto out_short_read;
715
716 ret = read_one_chunk(fs_info, &key, sb, chunk, -1);
717 if (ret)
718 break;
719 } else {
720 printk(
721 "ERROR: unexpected item type %u in sys_array at offset %u\n",
722 (u32)key.type, cur_offset);
723 ret = -EIO;
724 break;
725 }
726 array_ptr += len;
727 sb_array_offset += len;
728 cur_offset += len;
729 }
730 free_extent_buffer(sb);
731 return ret;
732
733out_short_read:
734 printk("ERROR: sys_array too short to read %u bytes at offset %u\n",
735 len, cur_offset);
736 free_extent_buffer(sb);
737 return -EIO;
738}
739
740int btrfs_read_chunk_tree(struct btrfs_fs_info *fs_info)
741{
742 struct btrfs_path *path;
743 struct extent_buffer *leaf;
744 struct btrfs_key key;
745 struct btrfs_key found_key;
746 struct btrfs_root *root = fs_info->chunk_root;
747 int ret;
748 int slot;
749
750 path = btrfs_alloc_path();
751 if (!path)
752 return -ENOMEM;
753
754 /*
755 * Read all device items, and then all the chunk items. All
756 * device items are found before any chunk item (their object id
757 * is smaller than the lowest possible object id for a chunk
758 * item - BTRFS_FIRST_CHUNK_TREE_OBJECTID).
759 */
760 key.objectid = BTRFS_DEV_ITEMS_OBJECTID;
761 key.offset = 0;
762 key.type = 0;
763 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
764 if (ret < 0)
765 goto error;
766 while(1) {
767 leaf = path->nodes[0];
768 slot = path->slots[0];
769 if (slot >= btrfs_header_nritems(leaf)) {
770 ret = btrfs_next_leaf(root, path);
771 if (ret == 0)
772 continue;
773 if (ret < 0)
774 goto error;
775 break;
776 }
777 btrfs_item_key_to_cpu(leaf, &found_key, slot);
778 if (found_key.type == BTRFS_DEV_ITEM_KEY) {
779 struct btrfs_dev_item *dev_item;
780 dev_item = btrfs_item_ptr(leaf, slot,
781 struct btrfs_dev_item);
782 ret = read_one_dev(fs_info, leaf, dev_item);
783 if (ret < 0)
784 goto error;
785 } else if (found_key.type == BTRFS_CHUNK_ITEM_KEY) {
786 struct btrfs_chunk *chunk;
787 chunk = btrfs_item_ptr(leaf, slot, struct btrfs_chunk);
788 ret = read_one_chunk(fs_info, &found_key, leaf, chunk,
789 slot);
790 if (ret < 0)
791 goto error;
792 }
793 path->slots[0]++;
794 }
795
796 ret = 0;
797error:
798 btrfs_free_path(path);
799 return ret;
800}
801
b1f0067a
QW		 802/*
803 * Get stripe length from chunk item and its stripe items
804 *
805 * Caller should only call this function after validating the chunk item
806 * by using btrfs_check_chunk_valid().
807 */
808u64 btrfs_stripe_length(struct btrfs_fs_info *fs_info,
809 struct extent_buffer *leaf,
810 struct btrfs_chunk *chunk)
811{
812 u64 stripe_len;
813 u64 chunk_len;
814 u32 num_stripes = btrfs_chunk_num_stripes(leaf, chunk);
815 u64 profile = btrfs_chunk_type(leaf, chunk) &
816 BTRFS_BLOCK_GROUP_PROFILE_MASK;
817
818 chunk_len = btrfs_chunk_length(leaf, chunk);
819
820 switch (profile) {
821 case 0: /* Single profile */
822 case BTRFS_BLOCK_GROUP_RAID1:
823 case BTRFS_BLOCK_GROUP_RAID1C3:
824 case BTRFS_BLOCK_GROUP_RAID1C4:
825 case BTRFS_BLOCK_GROUP_DUP:
826 stripe_len = chunk_len;
827 break;
828 case BTRFS_BLOCK_GROUP_RAID0:
829 stripe_len = chunk_len / num_stripes;
830 break;
831 case BTRFS_BLOCK_GROUP_RAID5:
832 stripe_len = chunk_len / (num_stripes - 1);
833 break;
834 case BTRFS_BLOCK_GROUP_RAID6:
835 stripe_len = chunk_len / (num_stripes - 2);
836 break;
837 case BTRFS_BLOCK_GROUP_RAID10:
838 stripe_len = chunk_len / (num_stripes /
839 btrfs_chunk_sub_stripes(leaf, chunk));
840 break;
841 default:
842 /* Invalid chunk profile found */
843 BUG_ON(1);
844 }
845 return stripe_len;
846}
847
848int btrfs_num_copies(struct btrfs_fs_info *fs_info, u64 logical, u64 len)
849{
850 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
851 struct cache_extent *ce;
852 struct map_lookup *map;
853 int ret;
854
855 ce = search_cache_extent(&map_tree->cache_tree, logical);
856 if (!ce) {
857 fprintf(stderr, "No mapping for %llu-%llu\n",
858 (unsigned long long)logical,
859 (unsigned long long)logical+len);
860 return 1;
861 }
862 if (ce->start > logical || ce->start + ce->size < logical) {
863 fprintf(stderr, "Invalid mapping for %llu-%llu, got "
864 "%llu-%llu\n", (unsigned long long)logical,
865 (unsigned long long)logical+len,
866 (unsigned long long)ce->start,
867 (unsigned long long)ce->start + ce->size);
868 return 1;
869 }
870 map = container_of(ce, struct map_lookup, ce);
871
872 if (map->type & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
873 BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4))
874 ret = map->num_stripes;
875 else if (map->type & BTRFS_BLOCK_GROUP_RAID10)
876 ret = map->sub_stripes;
877 else if (map->type & BTRFS_BLOCK_GROUP_RAID5)
878 ret = 2;
879 else if (map->type & BTRFS_BLOCK_GROUP_RAID6)
880 ret = 3;
881 else
882 ret = 1;
883 return ret;
884}
885
886int btrfs_next_bg(struct btrfs_fs_info *fs_info, u64 *logical,
887 u64 *size, u64 type)
888{
889 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
890 struct cache_extent *ce;
891 struct map_lookup *map;
892 u64 cur = *logical;
893
894 ce = search_cache_extent(&map_tree->cache_tree, cur);
895
896 while (ce) {
897 /*
898 * only jump to next bg if our cur is not 0
899 * As the initial logical for btrfs_next_bg() is 0, and
900 * if we jump to next bg, we skipped a valid bg.
901 */
902 if (cur) {
903 ce = next_cache_extent(ce);
904 if (!ce)
905 return -ENOENT;
906 }
907
908 cur = ce->start;
909 map = container_of(ce, struct map_lookup, ce);
910 if (map->type & type) {
911 *logical = ce->start;
912 *size = ce->size;
913 return 0;
914 }
915 if (!cur)
916 ce = next_cache_extent(ce);
917 }
918
919 return -ENOENT;
920}
921
922static inline int parity_smaller(u64 a, u64 b)
923{
924 return a > b;
925}
926
927/* Bubble-sort the stripe set to put the parity/syndrome stripes last */
928static void sort_parity_stripes(struct btrfs_multi_bio *bbio, u64 *raid_map)
929{
930 struct btrfs_bio_stripe s;
931 int i;
932 u64 l;
933 int again = 1;
934
935 while (again) {
936 again = 0;
937 for (i = 0; i < bbio->num_stripes - 1; i++) {
938 if (parity_smaller(raid_map[i], raid_map[i+1])) {
939 s = bbio->stripes[i];
940 l = raid_map[i];
941 bbio->stripes[i] = bbio->stripes[i+1];
942 raid_map[i] = raid_map[i+1];
943 bbio->stripes[i+1] = s;
944 raid_map[i+1] = l;
945 again = 1;
946 }
947 }
948 }
949}
950
951int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
952 u64 logical, u64 *length, u64 *type,
953 struct btrfs_multi_bio **multi_ret, int mirror_num,
954 u64 **raid_map_ret)
955{
956 struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree;
957 struct cache_extent *ce;
958 struct map_lookup *map;
511a1303 959 u64 orig_len = *length;
b1f0067a
QW		 960 u64 offset;
961 u64 stripe_offset;
962 u64 *raid_map = NULL;
963 int stripe_nr;
964 int stripes_allocated = 8;
965 int stripes_required = 1;
966 int stripe_index;
967 int i;
968 struct btrfs_multi_bio *multi = NULL;
969
970 if (multi_ret && rw == READ) {
971 stripes_allocated = 1;
972 }
973again:
974 ce = search_cache_extent(&map_tree->cache_tree, logical);
975 if (!ce) {
976 kfree(multi);
977 *length = (u64)-1;
978 return -ENOENT;
979 }
980 if (ce->start > logical) {
981 kfree(multi);
982 *length = ce->start - logical;
983 return -ENOENT;
984 }
985
986 if (multi_ret) {
987 multi = kzalloc(btrfs_multi_bio_size(stripes_allocated),
988 GFP_NOFS);
989 if (!multi)
990 return -ENOMEM;
991 }
992 map = container_of(ce, struct map_lookup, ce);
993 offset = logical - ce->start;
994
995 if (rw == WRITE) {
996 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
997 BTRFS_BLOCK_GROUP_RAID1C3 |
998 BTRFS_BLOCK_GROUP_RAID1C4 |
999 BTRFS_BLOCK_GROUP_DUP)) {
1000 stripes_required = map->num_stripes;
1001 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
1002 stripes_required = map->sub_stripes;
1003 }
1004 }
1005 if (map->type & (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)
1006 && multi_ret && ((rw & WRITE) || mirror_num > 1) && raid_map_ret) {
1007 /* RAID[56] write or recovery. Return all stripes */
1008 stripes_required = map->num_stripes;
1009
1010 /* Only allocate the map if we've already got a large enough multi_ret */
1011 if (stripes_allocated >= stripes_required) {
1012 raid_map = kmalloc(sizeof(u64) * map->num_stripes, GFP_NOFS);
1013 if (!raid_map) {
1014 kfree(multi);
1015 return -ENOMEM;
1016 }
1017 }
1018 }
1019
1020 /* if our multi bio struct is too small, back off and try again */
1021 if (multi_ret && stripes_allocated < stripes_required) {
1022 stripes_allocated = stripes_required;
1023 kfree(multi);
1024 multi = NULL;
1025 goto again;
1026 }
1027 stripe_nr = offset;
1028 /*
1029 * stripe_nr counts the total number of stripes we have to stride
1030 * to get to this block
1031 */
1032 stripe_nr = stripe_nr / map->stripe_len;
1033
3b72612a 1034 stripe_offset = stripe_nr * (u64)map->stripe_len;
b1f0067a
QW		 1035 BUG_ON(offset < stripe_offset);
1036
1037 /* stripe_offset is the offset of this block in its stripe*/
1038 stripe_offset = offset - stripe_offset;
1039
1040 if (map->type & (BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID1 |
1041 BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4 |
1042 BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6 |
1043 BTRFS_BLOCK_GROUP_RAID10 |
1044 BTRFS_BLOCK_GROUP_DUP)) {
1045 /* we limit the length of each bio to what fits in a stripe */
1046 *length = min_t(u64, ce->size - offset,
1047 map->stripe_len - stripe_offset);
1048 } else {
1049 *length = ce->size - offset;
1050 }
511a1303 1051 *length = min_t(u64, *length, orig_len);
b1f0067a
QW		 1052
1053 if (!multi_ret)
1054 goto out;
1055
1056 multi->num_stripes = 1;
1057 stripe_index = 0;
1058 if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
1059 BTRFS_BLOCK_GROUP_RAID1C3 |
1060 BTRFS_BLOCK_GROUP_RAID1C4)) {
1061 if (rw == WRITE)
1062 multi->num_stripes = map->num_stripes;
1063 else if (mirror_num)
1064 stripe_index = mirror_num - 1;
1065 else
1066 stripe_index = stripe_nr % map->num_stripes;
1067 } else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
1068 int factor = map->num_stripes / map->sub_stripes;
1069
1070 stripe_index = stripe_nr % factor;
1071 stripe_index *= map->sub_stripes;
1072
1073 if (rw == WRITE)
1074 multi->num_stripes = map->sub_stripes;
1075 else if (mirror_num)
1076 stripe_index += mirror_num - 1;
1077
1078 stripe_nr = stripe_nr / factor;
1079 } else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
1080 if (rw == WRITE)
1081 multi->num_stripes = map->num_stripes;
1082 else if (mirror_num)
1083 stripe_index = mirror_num - 1;
1084 } else if (map->type & (BTRFS_BLOCK_GROUP_RAID5 |
1085 BTRFS_BLOCK_GROUP_RAID6)) {
1086
1087 if (raid_map) {
1088 int rot;
1089 u64 tmp;
1090 u64 raid56_full_stripe_start;
1091 u64 full_stripe_len = nr_data_stripes(map) * map->stripe_len;
1092
1093 /*
1094 * align the start of our data stripe in the logical
1095 * address space
1096 */
1097 raid56_full_stripe_start = offset / full_stripe_len;
1098 raid56_full_stripe_start *= full_stripe_len;
1099
1100 /* get the data stripe number */
1101 stripe_nr = raid56_full_stripe_start / map->stripe_len;
1102 stripe_nr = stripe_nr / nr_data_stripes(map);
1103
1104 /* Work out the disk rotation on this stripe-set */
1105 rot = stripe_nr % map->num_stripes;
1106
1107 /* Fill in the logical address of each stripe */
3b72612a 1108 tmp = (u64)stripe_nr * nr_data_stripes(map);
b1f0067a
QW		 1109
1110 for (i = 0; i < nr_data_stripes(map); i++)
1111 raid_map[(i+rot) % map->num_stripes] =
1112 ce->start + (tmp + i) * map->stripe_len;
1113
1114 raid_map[(i+rot) % map->num_stripes] = BTRFS_RAID5_P_STRIPE;
1115 if (map->type & BTRFS_BLOCK_GROUP_RAID6)
1116 raid_map[(i+rot+1) % map->num_stripes] = BTRFS_RAID6_Q_STRIPE;
1117
1118 *length = map->stripe_len;
1119 stripe_index = 0;
1120 stripe_offset = 0;
1121 multi->num_stripes = map->num_stripes;
1122 } else {
1123 stripe_index = stripe_nr % nr_data_stripes(map);
1124 stripe_nr = stripe_nr / nr_data_stripes(map);
1125
1126 /*
1127 * Mirror #0 or #1 means the original data block.
1128 * Mirror #2 is RAID5 parity block.
1129 * Mirror #3 is RAID6 Q block.
1130 */
1131 if (mirror_num > 1)
1132 stripe_index = nr_data_stripes(map) + mirror_num - 2;
1133
1134 /* We distribute the parity blocks across stripes */
1135 stripe_index = (stripe_nr + stripe_index) % map->num_stripes;
1136 }
1137 } else {
1138 /*
1139 * after this do_div call, stripe_nr is the number of stripes
1140 * on this device we have to walk to find the data, and
1141 * stripe_index is the number of our device in the stripe array
1142 */
1143 stripe_index = stripe_nr % map->num_stripes;
1144 stripe_nr = stripe_nr / map->num_stripes;
1145 }
1146 BUG_ON(stripe_index >= map->num_stripes);
1147
1148 for (i = 0; i < multi->num_stripes; i++) {
1149 multi->stripes[i].physical =
1150 map->stripes[stripe_index].physical + stripe_offset +
1151 stripe_nr * map->stripe_len;
1152 multi->stripes[i].dev = map->stripes[stripe_index].dev;
1153 stripe_index++;
1154 }
1155 *multi_ret = multi;
1156
1157 if (type)
1158 *type = map->type;
1159
1160 if (raid_map) {
1161 sort_parity_stripes(multi, raid_map);
1162 *raid_map_ret = raid_map;
1163 }
1164out:
1165 return 0;
1166}
1167
1168int btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
1169 u64 logical, u64 *length,
1170 struct btrfs_multi_bio **multi_ret, int mirror_num,
1171 u64 **raid_map_ret)
1172{
1173 return __btrfs_map_block(fs_info, rw, logical, length, NULL,
1174 multi_ret, mirror_num, raid_map_ret);
1175}
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