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1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/bitops.h>
4#include <linux/slab.h>
5#include <linux/blkdev.h>
6#include <linux/sched/mm.h>
7#include <linux/atomic.h>
8#include <linux/vmalloc.h>
9#include "ctree.h"
10#include "volumes.h"
11#include "zoned.h"
12#include "rcu-string.h"
13#include "disk-io.h"
14#include "block-group.h"
15#include "transaction.h"
16#include "dev-replace.h"
17#include "space-info.h"
18#include "super.h"
19#include "fs.h"
20#include "accessors.h"
21#include "bio.h"
22
23/* Maximum number of zones to report per blkdev_report_zones() call */
24#define BTRFS_REPORT_NR_ZONES 4096
25/* Invalid allocation pointer value for missing devices */
26#define WP_MISSING_DEV ((u64)-1)
27/* Pseudo write pointer value for conventional zone */
28#define WP_CONVENTIONAL ((u64)-2)
29
30/*
31 * Location of the first zone of superblock logging zone pairs.
32 *
33 * - primary superblock: 0B (zone 0)
34 * - first copy: 512G (zone starting at that offset)
35 * - second copy: 4T (zone starting at that offset)
36 */
37#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)
38#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)
39#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)
40
41#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)
42#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)
43
44/* Number of superblock log zones */
45#define BTRFS_NR_SB_LOG_ZONES 2
46
47/*
48 * Minimum of active zones we need:
49 *
50 * - BTRFS_SUPER_MIRROR_MAX zones for superblock mirrors
51 * - 3 zones to ensure at least one zone per SYSTEM, META and DATA block group
52 * - 1 zone for tree-log dedicated block group
53 * - 1 zone for relocation
54 */
55#define BTRFS_MIN_ACTIVE_ZONES (BTRFS_SUPER_MIRROR_MAX + 5)
56
57/*
58 * Minimum / maximum supported zone size. Currently, SMR disks have a zone
59 * size of 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range.
60 * We do not expect the zone size to become larger than 8GiB or smaller than
61 * 4MiB in the near future.
62 */
63#define BTRFS_MAX_ZONE_SIZE SZ_8G
64#define BTRFS_MIN_ZONE_SIZE SZ_4M
65
66#define SUPER_INFO_SECTORS ((u64)BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT)
67
68static void wait_eb_writebacks(struct btrfs_block_group *block_group);
69static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written);
70
71static inline bool sb_zone_is_full(const struct blk_zone *zone)
72{
73 return (zone->cond == BLK_ZONE_COND_FULL) ||
74 (zone->wp + SUPER_INFO_SECTORS > zone->start + zone->capacity);
75}
76
77static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
78{
79 struct blk_zone *zones = data;
80
81 memcpy(&zones[idx], zone, sizeof(*zone));
82
83 return 0;
84}
85
86static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
87 u64 *wp_ret)
88{
89 bool empty[BTRFS_NR_SB_LOG_ZONES];
90 bool full[BTRFS_NR_SB_LOG_ZONES];
91 sector_t sector;
92 int i;
93
94 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
95 ASSERT(zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL);
96 empty[i] = (zones[i].cond == BLK_ZONE_COND_EMPTY);
97 full[i] = sb_zone_is_full(&zones[i]);
98 }
99
100 /*
101 * Possible states of log buffer zones
102 *
103 * Empty[0] In use[0] Full[0]
104 * Empty[1] * 0 1
105 * In use[1] x x 1
106 * Full[1] 0 0 C
107 *
108 * Log position:
109 * *: Special case, no superblock is written
110 * 0: Use write pointer of zones[0]
111 * 1: Use write pointer of zones[1]
112 * C: Compare super blocks from zones[0] and zones[1], use the latest
113 * one determined by generation
114 * x: Invalid state
115 */
116
117 if (empty[0] && empty[1]) {
118 /* Special case to distinguish no superblock to read */
119 *wp_ret = zones[0].start << SECTOR_SHIFT;
120 return -ENOENT;
121 } else if (full[0] && full[1]) {
122 /* Compare two super blocks */
123 struct address_space *mapping = bdev->bd_inode->i_mapping;
124 struct page *page[BTRFS_NR_SB_LOG_ZONES];
125 struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
126 int i;
127
128 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
129 u64 zone_end = (zones[i].start + zones[i].capacity) << SECTOR_SHIFT;
130 u64 bytenr = ALIGN_DOWN(zone_end, BTRFS_SUPER_INFO_SIZE) -
131 BTRFS_SUPER_INFO_SIZE;
132
133 page[i] = read_cache_page_gfp(mapping,
134 bytenr >> PAGE_SHIFT, GFP_NOFS);
135 if (IS_ERR(page[i])) {
136 if (i == 1)
137 btrfs_release_disk_super(super[0]);
138 return PTR_ERR(page[i]);
139 }
140 super[i] = page_address(page[i]);
141 }
142
143 if (btrfs_super_generation(super[0]) >
144 btrfs_super_generation(super[1]))
145 sector = zones[1].start;
146 else
147 sector = zones[0].start;
148
149 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
150 btrfs_release_disk_super(super[i]);
151 } else if (!full[0] && (empty[1] || full[1])) {
152 sector = zones[0].wp;
153 } else if (full[0]) {
154 sector = zones[1].wp;
155 } else {
156 return -EUCLEAN;
157 }
158 *wp_ret = sector << SECTOR_SHIFT;
159 return 0;
160}
161
162/*
163 * Get the first zone number of the superblock mirror
164 */
165static inline u32 sb_zone_number(int shift, int mirror)
166{
167 u64 zone = U64_MAX;
168
169 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
170 switch (mirror) {
171 case 0: zone = 0; break;
172 case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
173 case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
174 }
175
176 ASSERT(zone <= U32_MAX);
177
178 return (u32)zone;
179}
180
181static inline sector_t zone_start_sector(u32 zone_number,
182 struct block_device *bdev)
183{
184 return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));
185}
186
187static inline u64 zone_start_physical(u32 zone_number,
188 struct btrfs_zoned_device_info *zone_info)
189{
190 return (u64)zone_number << zone_info->zone_size_shift;
191}
192
193/*
194 * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
195 * device into static sized chunks and fake a conventional zone on each of
196 * them.
197 */
198static int emulate_report_zones(struct btrfs_device *device, u64 pos,
199 struct blk_zone *zones, unsigned int nr_zones)
200{
201 const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
202 sector_t bdev_size = bdev_nr_sectors(device->bdev);
203 unsigned int i;
204
205 pos >>= SECTOR_SHIFT;
206 for (i = 0; i < nr_zones; i++) {
207 zones[i].start = i * zone_sectors + pos;
208 zones[i].len = zone_sectors;
209 zones[i].capacity = zone_sectors;
210 zones[i].wp = zones[i].start + zone_sectors;
211 zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
212 zones[i].cond = BLK_ZONE_COND_NOT_WP;
213
214 if (zones[i].wp >= bdev_size) {
215 i++;
216 break;
217 }
218 }
219
220 return i;
221}
222
223static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
224 struct blk_zone *zones, unsigned int *nr_zones)
225{
226 struct btrfs_zoned_device_info *zinfo = device->zone_info;
227 int ret;
228
229 if (!*nr_zones)
230 return 0;
231
232 if (!bdev_is_zoned(device->bdev)) {
233 ret = emulate_report_zones(device, pos, zones, *nr_zones);
234 *nr_zones = ret;
235 return 0;
236 }
237
238 /* Check cache */
239 if (zinfo->zone_cache) {
240 unsigned int i;
241 u32 zno;
242
243 ASSERT(IS_ALIGNED(pos, zinfo->zone_size));
244 zno = pos >> zinfo->zone_size_shift;
245 /*
246 * We cannot report zones beyond the zone end. So, it is OK to
247 * cap *nr_zones to at the end.
248 */
249 *nr_zones = min_t(u32, *nr_zones, zinfo->nr_zones - zno);
250
251 for (i = 0; i < *nr_zones; i++) {
252 struct blk_zone *zone_info;
253
254 zone_info = &zinfo->zone_cache[zno + i];
255 if (!zone_info->len)
256 break;
257 }
258
259 if (i == *nr_zones) {
260 /* Cache hit on all the zones */
261 memcpy(zones, zinfo->zone_cache + zno,
262 sizeof(*zinfo->zone_cache) * *nr_zones);
263 return 0;
264 }
265 }
266
267 ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
268 copy_zone_info_cb, zones);
269 if (ret < 0) {
270 btrfs_err_in_rcu(device->fs_info,
271 "zoned: failed to read zone %llu on %s (devid %llu)",
272 pos, rcu_str_deref(device->name),
273 device->devid);
274 return ret;
275 }
276 *nr_zones = ret;
277 if (!ret)
278 return -EIO;
279
280 /* Populate cache */
281 if (zinfo->zone_cache) {
282 u32 zno = pos >> zinfo->zone_size_shift;
283
284 memcpy(zinfo->zone_cache + zno, zones,
285 sizeof(*zinfo->zone_cache) * *nr_zones);
286 }
287
288 return 0;
289}
290
291/* The emulated zone size is determined from the size of device extent */
292static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
293{
294 struct btrfs_path *path;
295 struct btrfs_root *root = fs_info->dev_root;
296 struct btrfs_key key;
297 struct extent_buffer *leaf;
298 struct btrfs_dev_extent *dext;
299 int ret = 0;
300
301 key.objectid = 1;
302 key.type = BTRFS_DEV_EXTENT_KEY;
303 key.offset = 0;
304
305 path = btrfs_alloc_path();
306 if (!path)
307 return -ENOMEM;
308
309 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
310 if (ret < 0)
311 goto out;
312
313 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
314 ret = btrfs_next_leaf(root, path);
315 if (ret < 0)
316 goto out;
317 /* No dev extents at all? Not good */
318 if (ret > 0) {
319 ret = -EUCLEAN;
320 goto out;
321 }
322 }
323
324 leaf = path->nodes[0];
325 dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
326 fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
327 ret = 0;
328
329out:
330 btrfs_free_path(path);
331
332 return ret;
333}
334
335int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
336{
337 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
338 struct btrfs_device *device;
339 int ret = 0;
340
341 /* fs_info->zone_size might not set yet. Use the incomapt flag here. */
342 if (!btrfs_fs_incompat(fs_info, ZONED))
343 return 0;
344
345 mutex_lock(&fs_devices->device_list_mutex);
346 list_for_each_entry(device, &fs_devices->devices, dev_list) {
347 /* We can skip reading of zone info for missing devices */
348 if (!device->bdev)
349 continue;
350
351 ret = btrfs_get_dev_zone_info(device, true);
352 if (ret)
353 break;
354 }
355 mutex_unlock(&fs_devices->device_list_mutex);
356
357 return ret;
358}
359
360int btrfs_get_dev_zone_info(struct btrfs_device *device, bool populate_cache)
361{
362 struct btrfs_fs_info *fs_info = device->fs_info;
363 struct btrfs_zoned_device_info *zone_info = NULL;
364 struct block_device *bdev = device->bdev;
365 unsigned int max_active_zones;
366 unsigned int nactive;
367 sector_t nr_sectors;
368 sector_t sector = 0;
369 struct blk_zone *zones = NULL;
370 unsigned int i, nreported = 0, nr_zones;
371 sector_t zone_sectors;
372 char *model, *emulated;
373 int ret;
374
375 /*
376 * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
377 * yet be set.
378 */
379 if (!btrfs_fs_incompat(fs_info, ZONED))
380 return 0;
381
382 if (device->zone_info)
383 return 0;
384
385 zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
386 if (!zone_info)
387 return -ENOMEM;
388
389 device->zone_info = zone_info;
390
391 if (!bdev_is_zoned(bdev)) {
392 if (!fs_info->zone_size) {
393 ret = calculate_emulated_zone_size(fs_info);
394 if (ret)
395 goto out;
396 }
397
398 ASSERT(fs_info->zone_size);
399 zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
400 } else {
401 zone_sectors = bdev_zone_sectors(bdev);
402 }
403
404 ASSERT(is_power_of_two_u64(zone_sectors));
405 zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
406
407 /* We reject devices with a zone size larger than 8GB */
408 if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
409 btrfs_err_in_rcu(fs_info,
410 "zoned: %s: zone size %llu larger than supported maximum %llu",
411 rcu_str_deref(device->name),
412 zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
413 ret = -EINVAL;
414 goto out;
415 } else if (zone_info->zone_size < BTRFS_MIN_ZONE_SIZE) {
416 btrfs_err_in_rcu(fs_info,
417 "zoned: %s: zone size %llu smaller than supported minimum %u",
418 rcu_str_deref(device->name),
419 zone_info->zone_size, BTRFS_MIN_ZONE_SIZE);
420 ret = -EINVAL;
421 goto out;
422 }
423
424 nr_sectors = bdev_nr_sectors(bdev);
425 zone_info->zone_size_shift = ilog2(zone_info->zone_size);
426 zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
427 if (!IS_ALIGNED(nr_sectors, zone_sectors))
428 zone_info->nr_zones++;
429
430 max_active_zones = bdev_max_active_zones(bdev);
431 if (max_active_zones && max_active_zones < BTRFS_MIN_ACTIVE_ZONES) {
432 btrfs_err_in_rcu(fs_info,
433"zoned: %s: max active zones %u is too small, need at least %u active zones",
434 rcu_str_deref(device->name), max_active_zones,
435 BTRFS_MIN_ACTIVE_ZONES);
436 ret = -EINVAL;
437 goto out;
438 }
439 zone_info->max_active_zones = max_active_zones;
440
441 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
442 if (!zone_info->seq_zones) {
443 ret = -ENOMEM;
444 goto out;
445 }
446
447 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
448 if (!zone_info->empty_zones) {
449 ret = -ENOMEM;
450 goto out;
451 }
452
453 zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
454 if (!zone_info->active_zones) {
455 ret = -ENOMEM;
456 goto out;
457 }
458
459 zones = kvcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
460 if (!zones) {
461 ret = -ENOMEM;
462 goto out;
463 }
464
465 /*
466 * Enable zone cache only for a zoned device. On a non-zoned device, we
467 * fill the zone info with emulated CONVENTIONAL zones, so no need to
468 * use the cache.
469 */
470 if (populate_cache && bdev_is_zoned(device->bdev)) {
471 zone_info->zone_cache = vcalloc(zone_info->nr_zones,
472 sizeof(struct blk_zone));
473 if (!zone_info->zone_cache) {
474 btrfs_err_in_rcu(device->fs_info,
475 "zoned: failed to allocate zone cache for %s",
476 rcu_str_deref(device->name));
477 ret = -ENOMEM;
478 goto out;
479 }
480 }
481
482 /* Get zones type */
483 nactive = 0;
484 while (sector < nr_sectors) {
485 nr_zones = BTRFS_REPORT_NR_ZONES;
486 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
487 &nr_zones);
488 if (ret)
489 goto out;
490
491 for (i = 0; i < nr_zones; i++) {
492 if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
493 __set_bit(nreported, zone_info->seq_zones);
494 switch (zones[i].cond) {
495 case BLK_ZONE_COND_EMPTY:
496 __set_bit(nreported, zone_info->empty_zones);
497 break;
498 case BLK_ZONE_COND_IMP_OPEN:
499 case BLK_ZONE_COND_EXP_OPEN:
500 case BLK_ZONE_COND_CLOSED:
501 __set_bit(nreported, zone_info->active_zones);
502 nactive++;
503 break;
504 }
505 nreported++;
506 }
507 sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
508 }
509
510 if (nreported != zone_info->nr_zones) {
511 btrfs_err_in_rcu(device->fs_info,
512 "inconsistent number of zones on %s (%u/%u)",
513 rcu_str_deref(device->name), nreported,
514 zone_info->nr_zones);
515 ret = -EIO;
516 goto out;
517 }
518
519 if (max_active_zones) {
520 if (nactive > max_active_zones) {
521 btrfs_err_in_rcu(device->fs_info,
522 "zoned: %u active zones on %s exceeds max_active_zones %u",
523 nactive, rcu_str_deref(device->name),
524 max_active_zones);
525 ret = -EIO;
526 goto out;
527 }
528 atomic_set(&zone_info->active_zones_left,
529 max_active_zones - nactive);
530 set_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags);
531 }
532
533 /* Validate superblock log */
534 nr_zones = BTRFS_NR_SB_LOG_ZONES;
535 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
536 u32 sb_zone;
537 u64 sb_wp;
538 int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
539
540 sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
541 if (sb_zone + 1 >= zone_info->nr_zones)
542 continue;
543
544 ret = btrfs_get_dev_zones(device,
545 zone_start_physical(sb_zone, zone_info),
546 &zone_info->sb_zones[sb_pos],
547 &nr_zones);
548 if (ret)
549 goto out;
550
551 if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
552 btrfs_err_in_rcu(device->fs_info,
553 "zoned: failed to read super block log zone info at devid %llu zone %u",
554 device->devid, sb_zone);
555 ret = -EUCLEAN;
556 goto out;
557 }
558
559 /*
560 * If zones[0] is conventional, always use the beginning of the
561 * zone to record superblock. No need to validate in that case.
562 */
563 if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
564 BLK_ZONE_TYPE_CONVENTIONAL)
565 continue;
566
567 ret = sb_write_pointer(device->bdev,
568 &zone_info->sb_zones[sb_pos], &sb_wp);
569 if (ret != -ENOENT && ret) {
570 btrfs_err_in_rcu(device->fs_info,
571 "zoned: super block log zone corrupted devid %llu zone %u",
572 device->devid, sb_zone);
573 ret = -EUCLEAN;
574 goto out;
575 }
576 }
577
578
579 kvfree(zones);
580
581 if (bdev_is_zoned(bdev)) {
582 model = "host-managed zoned";
583 emulated = "";
584 } else {
585 model = "regular";
586 emulated = "emulated ";
587 }
588
589 btrfs_info_in_rcu(fs_info,
590 "%s block device %s, %u %szones of %llu bytes",
591 model, rcu_str_deref(device->name), zone_info->nr_zones,
592 emulated, zone_info->zone_size);
593
594 return 0;
595
596out:
597 kvfree(zones);
598 btrfs_destroy_dev_zone_info(device);
599 return ret;
600}
601
602void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
603{
604 struct btrfs_zoned_device_info *zone_info = device->zone_info;
605
606 if (!zone_info)
607 return;
608
609 bitmap_free(zone_info->active_zones);
610 bitmap_free(zone_info->seq_zones);
611 bitmap_free(zone_info->empty_zones);
612 vfree(zone_info->zone_cache);
613 kfree(zone_info);
614 device->zone_info = NULL;
615}
616
617struct btrfs_zoned_device_info *btrfs_clone_dev_zone_info(struct btrfs_device *orig_dev)
618{
619 struct btrfs_zoned_device_info *zone_info;
620
621 zone_info = kmemdup(orig_dev->zone_info, sizeof(*zone_info), GFP_KERNEL);
622 if (!zone_info)
623 return NULL;
624
625 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
626 if (!zone_info->seq_zones)
627 goto out;
628
629 bitmap_copy(zone_info->seq_zones, orig_dev->zone_info->seq_zones,
630 zone_info->nr_zones);
631
632 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
633 if (!zone_info->empty_zones)
634 goto out;
635
636 bitmap_copy(zone_info->empty_zones, orig_dev->zone_info->empty_zones,
637 zone_info->nr_zones);
638
639 zone_info->active_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
640 if (!zone_info->active_zones)
641 goto out;
642
643 bitmap_copy(zone_info->active_zones, orig_dev->zone_info->active_zones,
644 zone_info->nr_zones);
645 zone_info->zone_cache = NULL;
646
647 return zone_info;
648
649out:
650 bitmap_free(zone_info->seq_zones);
651 bitmap_free(zone_info->empty_zones);
652 bitmap_free(zone_info->active_zones);
653 kfree(zone_info);
654 return NULL;
655}
656
657int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
658 struct blk_zone *zone)
659{
660 unsigned int nr_zones = 1;
661 int ret;
662
663 ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
664 if (ret != 0 || !nr_zones)
665 return ret ? ret : -EIO;
666
667 return 0;
668}
669
670static int btrfs_check_for_zoned_device(struct btrfs_fs_info *fs_info)
671{
672 struct btrfs_device *device;
673
674 list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
675 if (device->bdev && bdev_is_zoned(device->bdev)) {
676 btrfs_err(fs_info,
677 "zoned: mode not enabled but zoned device found: %pg",
678 device->bdev);
679 return -EINVAL;
680 }
681 }
682
683 return 0;
684}
685
686int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
687{
688 struct queue_limits *lim = &fs_info->limits;
689 struct btrfs_device *device;
690 u64 zone_size = 0;
691 int ret;
692
693 /*
694 * Host-Managed devices can't be used without the ZONED flag. With the
695 * ZONED all devices can be used, using zone emulation if required.
696 */
697 if (!btrfs_fs_incompat(fs_info, ZONED))
698 return btrfs_check_for_zoned_device(fs_info);
699
700 blk_set_stacking_limits(lim);
701
702 list_for_each_entry(device, &fs_info->fs_devices->devices, dev_list) {
703 struct btrfs_zoned_device_info *zone_info = device->zone_info;
704
705 if (!device->bdev)
706 continue;
707
708 if (!zone_size) {
709 zone_size = zone_info->zone_size;
710 } else if (zone_info->zone_size != zone_size) {
711 btrfs_err(fs_info,
712 "zoned: unequal block device zone sizes: have %llu found %llu",
713 zone_info->zone_size, zone_size);
714 return -EINVAL;
715 }
716
717 /*
718 * With the zoned emulation, we can have non-zoned device on the
719 * zoned mode. In this case, we don't have a valid max zone
720 * append size.
721 */
722 if (bdev_is_zoned(device->bdev)) {
723 blk_stack_limits(lim,
724 &bdev_get_queue(device->bdev)->limits,
725 0);
726 }
727 }
728
729 /*
730 * stripe_size is always aligned to BTRFS_STRIPE_LEN in
731 * btrfs_create_chunk(). Since we want stripe_len == zone_size,
732 * check the alignment here.
733 */
734 if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
735 btrfs_err(fs_info,
736 "zoned: zone size %llu not aligned to stripe %u",
737 zone_size, BTRFS_STRIPE_LEN);
738 return -EINVAL;
739 }
740
741 if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
742 btrfs_err(fs_info, "zoned: mixed block groups not supported");
743 return -EINVAL;
744 }
745
746 fs_info->zone_size = zone_size;
747 /*
748 * Also limit max_zone_append_size by max_segments * PAGE_SIZE.
749 * Technically, we can have multiple pages per segment. But, since
750 * we add the pages one by one to a bio, and cannot increase the
751 * metadata reservation even if it increases the number of extents, it
752 * is safe to stick with the limit.
753 */
754 fs_info->max_zone_append_size = ALIGN_DOWN(
755 min3((u64)lim->max_zone_append_sectors << SECTOR_SHIFT,
756 (u64)lim->max_sectors << SECTOR_SHIFT,
757 (u64)lim->max_segments << PAGE_SHIFT),
758 fs_info->sectorsize);
759 fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
760 if (fs_info->max_zone_append_size < fs_info->max_extent_size)
761 fs_info->max_extent_size = fs_info->max_zone_append_size;
762
763 /*
764 * Check mount options here, because we might change fs_info->zoned
765 * from fs_info->zone_size.
766 */
767 ret = btrfs_check_mountopts_zoned(fs_info, &fs_info->mount_opt);
768 if (ret)
769 return ret;
770
771 btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
772 return 0;
773}
774
775int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info, unsigned long *mount_opt)
776{
777 if (!btrfs_is_zoned(info))
778 return 0;
779
780 /*
781 * Space cache writing is not COWed. Disable that to avoid write errors
782 * in sequential zones.
783 */
784 if (btrfs_raw_test_opt(*mount_opt, SPACE_CACHE)) {
785 btrfs_err(info, "zoned: space cache v1 is not supported");
786 return -EINVAL;
787 }
788
789 if (btrfs_raw_test_opt(*mount_opt, NODATACOW)) {
790 btrfs_err(info, "zoned: NODATACOW not supported");
791 return -EINVAL;
792 }
793
794 if (btrfs_raw_test_opt(*mount_opt, DISCARD_ASYNC)) {
795 btrfs_info(info,
796 "zoned: async discard ignored and disabled for zoned mode");
797 btrfs_clear_opt(*mount_opt, DISCARD_ASYNC);
798 }
799
800 return 0;
801}
802
803static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
804 int rw, u64 *bytenr_ret)
805{
806 u64 wp;
807 int ret;
808
809 if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {
810 *bytenr_ret = zones[0].start << SECTOR_SHIFT;
811 return 0;
812 }
813
814 ret = sb_write_pointer(bdev, zones, &wp);
815 if (ret != -ENOENT && ret < 0)
816 return ret;
817
818 if (rw == WRITE) {
819 struct blk_zone *reset = NULL;
820
821 if (wp == zones[0].start << SECTOR_SHIFT)
822 reset = &zones[0];
823 else if (wp == zones[1].start << SECTOR_SHIFT)
824 reset = &zones[1];
825
826 if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {
827 ASSERT(sb_zone_is_full(reset));
828
829 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
830 reset->start, reset->len,
831 GFP_NOFS);
832 if (ret)
833 return ret;
834
835 reset->cond = BLK_ZONE_COND_EMPTY;
836 reset->wp = reset->start;
837 }
838 } else if (ret != -ENOENT) {
839 /*
840 * For READ, we want the previous one. Move write pointer to
841 * the end of a zone, if it is at the head of a zone.
842 */
843 u64 zone_end = 0;
844
845 if (wp == zones[0].start << SECTOR_SHIFT)
846 zone_end = zones[1].start + zones[1].capacity;
847 else if (wp == zones[1].start << SECTOR_SHIFT)
848 zone_end = zones[0].start + zones[0].capacity;
849 if (zone_end)
850 wp = ALIGN_DOWN(zone_end << SECTOR_SHIFT,
851 BTRFS_SUPER_INFO_SIZE);
852
853 wp -= BTRFS_SUPER_INFO_SIZE;
854 }
855
856 *bytenr_ret = wp;
857 return 0;
858
859}
860
861int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
862 u64 *bytenr_ret)
863{
864 struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];
865 sector_t zone_sectors;
866 u32 sb_zone;
867 int ret;
868 u8 zone_sectors_shift;
869 sector_t nr_sectors;
870 u32 nr_zones;
871
872 if (!bdev_is_zoned(bdev)) {
873 *bytenr_ret = btrfs_sb_offset(mirror);
874 return 0;
875 }
876
877 ASSERT(rw == READ || rw == WRITE);
878
879 zone_sectors = bdev_zone_sectors(bdev);
880 if (!is_power_of_2(zone_sectors))
881 return -EINVAL;
882 zone_sectors_shift = ilog2(zone_sectors);
883 nr_sectors = bdev_nr_sectors(bdev);
884 nr_zones = nr_sectors >> zone_sectors_shift;
885
886 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
887 if (sb_zone + 1 >= nr_zones)
888 return -ENOENT;
889
890 ret = blkdev_report_zones(bdev, zone_start_sector(sb_zone, bdev),
891 BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,
892 zones);
893 if (ret < 0)
894 return ret;
895 if (ret != BTRFS_NR_SB_LOG_ZONES)
896 return -EIO;
897
898 return sb_log_location(bdev, zones, rw, bytenr_ret);
899}
900
901int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
902 u64 *bytenr_ret)
903{
904 struct btrfs_zoned_device_info *zinfo = device->zone_info;
905 u32 zone_num;
906
907 /*
908 * For a zoned filesystem on a non-zoned block device, use the same
909 * super block locations as regular filesystem. Doing so, the super
910 * block can always be retrieved and the zoned flag of the volume
911 * detected from the super block information.
912 */
913 if (!bdev_is_zoned(device->bdev)) {
914 *bytenr_ret = btrfs_sb_offset(mirror);
915 return 0;
916 }
917
918 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
919 if (zone_num + 1 >= zinfo->nr_zones)
920 return -ENOENT;
921
922 return sb_log_location(device->bdev,
923 &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],
924 rw, bytenr_ret);
925}
926
927static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,
928 int mirror)
929{
930 u32 zone_num;
931
932 if (!zinfo)
933 return false;
934
935 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
936 if (zone_num + 1 >= zinfo->nr_zones)
937 return false;
938
939 if (!test_bit(zone_num, zinfo->seq_zones))
940 return false;
941
942 return true;
943}
944
945int btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
946{
947 struct btrfs_zoned_device_info *zinfo = device->zone_info;
948 struct blk_zone *zone;
949 int i;
950
951 if (!is_sb_log_zone(zinfo, mirror))
952 return 0;
953
954 zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];
955 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
956 /* Advance the next zone */
957 if (zone->cond == BLK_ZONE_COND_FULL) {
958 zone++;
959 continue;
960 }
961
962 if (zone->cond == BLK_ZONE_COND_EMPTY)
963 zone->cond = BLK_ZONE_COND_IMP_OPEN;
964
965 zone->wp += SUPER_INFO_SECTORS;
966
967 if (sb_zone_is_full(zone)) {
968 /*
969 * No room left to write new superblock. Since
970 * superblock is written with REQ_SYNC, it is safe to
971 * finish the zone now.
972 *
973 * If the write pointer is exactly at the capacity,
974 * explicit ZONE_FINISH is not necessary.
975 */
976 if (zone->wp != zone->start + zone->capacity) {
977 int ret;
978
979 ret = blkdev_zone_mgmt(device->bdev,
980 REQ_OP_ZONE_FINISH, zone->start,
981 zone->len, GFP_NOFS);
982 if (ret)
983 return ret;
984 }
985
986 zone->wp = zone->start + zone->len;
987 zone->cond = BLK_ZONE_COND_FULL;
988 }
989 return 0;
990 }
991
992 /* All the zones are FULL. Should not reach here. */
993 ASSERT(0);
994 return -EIO;
995}
996
997int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
998{
999 sector_t zone_sectors;
1000 sector_t nr_sectors;
1001 u8 zone_sectors_shift;
1002 u32 sb_zone;
1003 u32 nr_zones;
1004
1005 zone_sectors = bdev_zone_sectors(bdev);
1006 zone_sectors_shift = ilog2(zone_sectors);
1007 nr_sectors = bdev_nr_sectors(bdev);
1008 nr_zones = nr_sectors >> zone_sectors_shift;
1009
1010 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
1011 if (sb_zone + 1 >= nr_zones)
1012 return -ENOENT;
1013
1014 return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
1015 zone_start_sector(sb_zone, bdev),
1016 zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
1017}
1018
1019/*
1020 * Find allocatable zones within a given region.
1021 *
1022 * @device: the device to allocate a region on
1023 * @hole_start: the position of the hole to allocate the region
1024 * @num_bytes: size of wanted region
1025 * @hole_end: the end of the hole
1026 * @return: position of allocatable zones
1027 *
1028 * Allocatable region should not contain any superblock locations.
1029 */
1030u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
1031 u64 hole_end, u64 num_bytes)
1032{
1033 struct btrfs_zoned_device_info *zinfo = device->zone_info;
1034 const u8 shift = zinfo->zone_size_shift;
1035 u64 nzones = num_bytes >> shift;
1036 u64 pos = hole_start;
1037 u64 begin, end;
1038 bool have_sb;
1039 int i;
1040
1041 ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
1042 ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
1043
1044 while (pos < hole_end) {
1045 begin = pos >> shift;
1046 end = begin + nzones;
1047
1048 if (end > zinfo->nr_zones)
1049 return hole_end;
1050
1051 /* Check if zones in the region are all empty */
1052 if (btrfs_dev_is_sequential(device, pos) &&
1053 !bitmap_test_range_all_set(zinfo->empty_zones, begin, nzones)) {
1054 pos += zinfo->zone_size;
1055 continue;
1056 }
1057
1058 have_sb = false;
1059 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
1060 u32 sb_zone;
1061 u64 sb_pos;
1062
1063 sb_zone = sb_zone_number(shift, i);
1064 if (!(end <= sb_zone ||
1065 sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
1066 have_sb = true;
1067 pos = zone_start_physical(
1068 sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo);
1069 break;
1070 }
1071
1072 /* We also need to exclude regular superblock positions */
1073 sb_pos = btrfs_sb_offset(i);
1074 if (!(pos + num_bytes <= sb_pos ||
1075 sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
1076 have_sb = true;
1077 pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
1078 zinfo->zone_size);
1079 break;
1080 }
1081 }
1082 if (!have_sb)
1083 break;
1084 }
1085
1086 return pos;
1087}
1088
1089static bool btrfs_dev_set_active_zone(struct btrfs_device *device, u64 pos)
1090{
1091 struct btrfs_zoned_device_info *zone_info = device->zone_info;
1092 unsigned int zno = (pos >> zone_info->zone_size_shift);
1093
1094 /* We can use any number of zones */
1095 if (zone_info->max_active_zones == 0)
1096 return true;
1097
1098 if (!test_bit(zno, zone_info->active_zones)) {
1099 /* Active zone left? */
1100 if (atomic_dec_if_positive(&zone_info->active_zones_left) < 0)
1101 return false;
1102 if (test_and_set_bit(zno, zone_info->active_zones)) {
1103 /* Someone already set the bit */
1104 atomic_inc(&zone_info->active_zones_left);
1105 }
1106 }
1107
1108 return true;
1109}
1110
1111static void btrfs_dev_clear_active_zone(struct btrfs_device *device, u64 pos)
1112{
1113 struct btrfs_zoned_device_info *zone_info = device->zone_info;
1114 unsigned int zno = (pos >> zone_info->zone_size_shift);
1115
1116 /* We can use any number of zones */
1117 if (zone_info->max_active_zones == 0)
1118 return;
1119
1120 if (test_and_clear_bit(zno, zone_info->active_zones))
1121 atomic_inc(&zone_info->active_zones_left);
1122}
1123
1124int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
1125 u64 length, u64 *bytes)
1126{
1127 int ret;
1128
1129 *bytes = 0;
1130 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
1131 physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT,
1132 GFP_NOFS);
1133 if (ret)
1134 return ret;
1135
1136 *bytes = length;
1137 while (length) {
1138 btrfs_dev_set_zone_empty(device, physical);
1139 btrfs_dev_clear_active_zone(device, physical);
1140 physical += device->zone_info->zone_size;
1141 length -= device->zone_info->zone_size;
1142 }
1143
1144 return 0;
1145}
1146
1147int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
1148{
1149 struct btrfs_zoned_device_info *zinfo = device->zone_info;
1150 const u8 shift = zinfo->zone_size_shift;
1151 unsigned long begin = start >> shift;
1152 unsigned long nbits = size >> shift;
1153 u64 pos;
1154 int ret;
1155
1156 ASSERT(IS_ALIGNED(start, zinfo->zone_size));
1157 ASSERT(IS_ALIGNED(size, zinfo->zone_size));
1158
1159 if (begin + nbits > zinfo->nr_zones)
1160 return -ERANGE;
1161
1162 /* All the zones are conventional */
1163 if (bitmap_test_range_all_zero(zinfo->seq_zones, begin, nbits))
1164 return 0;
1165
1166 /* All the zones are sequential and empty */
1167 if (bitmap_test_range_all_set(zinfo->seq_zones, begin, nbits) &&
1168 bitmap_test_range_all_set(zinfo->empty_zones, begin, nbits))
1169 return 0;
1170
1171 for (pos = start; pos < start + size; pos += zinfo->zone_size) {
1172 u64 reset_bytes;
1173
1174 if (!btrfs_dev_is_sequential(device, pos) ||
1175 btrfs_dev_is_empty_zone(device, pos))
1176 continue;
1177
1178 /* Free regions should be empty */
1179 btrfs_warn_in_rcu(
1180 device->fs_info,
1181 "zoned: resetting device %s (devid %llu) zone %llu for allocation",
1182 rcu_str_deref(device->name), device->devid, pos >> shift);
1183 WARN_ON_ONCE(1);
1184
1185 ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
1186 &reset_bytes);
1187 if (ret)
1188 return ret;
1189 }
1190
1191 return 0;
1192}
1193
1194/*
1195 * Calculate an allocation pointer from the extent allocation information
1196 * for a block group consist of conventional zones. It is pointed to the
1197 * end of the highest addressed extent in the block group as an allocation
1198 * offset.
1199 */
1200static int calculate_alloc_pointer(struct btrfs_block_group *cache,
1201 u64 *offset_ret, bool new)
1202{
1203 struct btrfs_fs_info *fs_info = cache->fs_info;
1204 struct btrfs_root *root;
1205 struct btrfs_path *path;
1206 struct btrfs_key key;
1207 struct btrfs_key found_key;
1208 int ret;
1209 u64 length;
1210
1211 /*
1212 * Avoid tree lookups for a new block group, there's no use for it.
1213 * It must always be 0.
1214 *
1215 * Also, we have a lock chain of extent buffer lock -> chunk mutex.
1216 * For new a block group, this function is called from
1217 * btrfs_make_block_group() which is already taking the chunk mutex.
1218 * Thus, we cannot call calculate_alloc_pointer() which takes extent
1219 * buffer locks to avoid deadlock.
1220 */
1221 if (new) {
1222 *offset_ret = 0;
1223 return 0;
1224 }
1225
1226 path = btrfs_alloc_path();
1227 if (!path)
1228 return -ENOMEM;
1229
1230 key.objectid = cache->start + cache->length;
1231 key.type = 0;
1232 key.offset = 0;
1233
1234 root = btrfs_extent_root(fs_info, key.objectid);
1235 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1236 /* We should not find the exact match */
1237 if (!ret)
1238 ret = -EUCLEAN;
1239 if (ret < 0)
1240 goto out;
1241
1242 ret = btrfs_previous_extent_item(root, path, cache->start);
1243 if (ret) {
1244 if (ret == 1) {
1245 ret = 0;
1246 *offset_ret = 0;
1247 }
1248 goto out;
1249 }
1250
1251 btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
1252
1253 if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
1254 length = found_key.offset;
1255 else
1256 length = fs_info->nodesize;
1257
1258 if (!(found_key.objectid >= cache->start &&
1259 found_key.objectid + length <= cache->start + cache->length)) {
1260 ret = -EUCLEAN;
1261 goto out;
1262 }
1263 *offset_ret = found_key.objectid + length - cache->start;
1264 ret = 0;
1265
1266out:
1267 btrfs_free_path(path);
1268 return ret;
1269}
1270
1271struct zone_info {
1272 u64 physical;
1273 u64 capacity;
1274 u64 alloc_offset;
1275};
1276
1277static int btrfs_load_zone_info(struct btrfs_fs_info *fs_info, int zone_idx,
1278 struct zone_info *info, unsigned long *active,
1279 struct btrfs_chunk_map *map)
1280{
1281 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
1282 struct btrfs_device *device = map->stripes[zone_idx].dev;
1283 int dev_replace_is_ongoing = 0;
1284 unsigned int nofs_flag;
1285 struct blk_zone zone;
1286 int ret;
1287
1288 info->physical = map->stripes[zone_idx].physical;
1289
1290 if (!device->bdev) {
1291 info->alloc_offset = WP_MISSING_DEV;
1292 return 0;
1293 }
1294
1295 /* Consider a zone as active if we can allow any number of active zones. */
1296 if (!device->zone_info->max_active_zones)
1297 __set_bit(zone_idx, active);
1298
1299 if (!btrfs_dev_is_sequential(device, info->physical)) {
1300 info->alloc_offset = WP_CONVENTIONAL;
1301 return 0;
1302 }
1303
1304 /* This zone will be used for allocation, so mark this zone non-empty. */
1305 btrfs_dev_clear_zone_empty(device, info->physical);
1306
1307 down_read(&dev_replace->rwsem);
1308 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
1309 if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
1310 btrfs_dev_clear_zone_empty(dev_replace->tgtdev, info->physical);
1311 up_read(&dev_replace->rwsem);
1312
1313 /*
1314 * The group is mapped to a sequential zone. Get the zone write pointer
1315 * to determine the allocation offset within the zone.
1316 */
1317 WARN_ON(!IS_ALIGNED(info->physical, fs_info->zone_size));
1318 nofs_flag = memalloc_nofs_save();
1319 ret = btrfs_get_dev_zone(device, info->physical, &zone);
1320 memalloc_nofs_restore(nofs_flag);
1321 if (ret) {
1322 if (ret != -EIO && ret != -EOPNOTSUPP)
1323 return ret;
1324 info->alloc_offset = WP_MISSING_DEV;
1325 return 0;
1326 }
1327
1328 if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) {
1329 btrfs_err_in_rcu(fs_info,
1330 "zoned: unexpected conventional zone %llu on device %s (devid %llu)",
1331 zone.start << SECTOR_SHIFT, rcu_str_deref(device->name),
1332 device->devid);
1333 return -EIO;
1334 }
1335
1336 info->capacity = (zone.capacity << SECTOR_SHIFT);
1337
1338 switch (zone.cond) {
1339 case BLK_ZONE_COND_OFFLINE:
1340 case BLK_ZONE_COND_READONLY:
1341 btrfs_err(fs_info,
1342 "zoned: offline/readonly zone %llu on device %s (devid %llu)",
1343 (info->physical >> device->zone_info->zone_size_shift),
1344 rcu_str_deref(device->name), device->devid);
1345 info->alloc_offset = WP_MISSING_DEV;
1346 break;
1347 case BLK_ZONE_COND_EMPTY:
1348 info->alloc_offset = 0;
1349 break;
1350 case BLK_ZONE_COND_FULL:
1351 info->alloc_offset = info->capacity;
1352 break;
1353 default:
1354 /* Partially used zone. */
1355 info->alloc_offset = ((zone.wp - zone.start) << SECTOR_SHIFT);
1356 __set_bit(zone_idx, active);
1357 break;
1358 }
1359
1360 return 0;
1361}
1362
1363static int btrfs_load_block_group_single(struct btrfs_block_group *bg,
1364 struct zone_info *info,
1365 unsigned long *active)
1366{
1367 if (info->alloc_offset == WP_MISSING_DEV) {
1368 btrfs_err(bg->fs_info,
1369 "zoned: cannot recover write pointer for zone %llu",
1370 info->physical);
1371 return -EIO;
1372 }
1373
1374 bg->alloc_offset = info->alloc_offset;
1375 bg->zone_capacity = info->capacity;
1376 if (test_bit(0, active))
1377 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
1378 return 0;
1379}
1380
1381static int btrfs_load_block_group_dup(struct btrfs_block_group *bg,
1382 struct btrfs_chunk_map *map,
1383 struct zone_info *zone_info,
1384 unsigned long *active)
1385{
1386 struct btrfs_fs_info *fs_info = bg->fs_info;
1387
1388 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
1389 btrfs_err(fs_info, "zoned: data DUP profile needs raid-stripe-tree");
1390 return -EINVAL;
1391 }
1392
1393 if (zone_info[0].alloc_offset == WP_MISSING_DEV) {
1394 btrfs_err(bg->fs_info,
1395 "zoned: cannot recover write pointer for zone %llu",
1396 zone_info[0].physical);
1397 return -EIO;
1398 }
1399 if (zone_info[1].alloc_offset == WP_MISSING_DEV) {
1400 btrfs_err(bg->fs_info,
1401 "zoned: cannot recover write pointer for zone %llu",
1402 zone_info[1].physical);
1403 return -EIO;
1404 }
1405 if (zone_info[0].alloc_offset != zone_info[1].alloc_offset) {
1406 btrfs_err(bg->fs_info,
1407 "zoned: write pointer offset mismatch of zones in DUP profile");
1408 return -EIO;
1409 }
1410
1411 if (test_bit(0, active) != test_bit(1, active)) {
1412 if (!btrfs_zone_activate(bg))
1413 return -EIO;
1414 } else if (test_bit(0, active)) {
1415 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
1416 }
1417
1418 bg->alloc_offset = zone_info[0].alloc_offset;
1419 bg->zone_capacity = min(zone_info[0].capacity, zone_info[1].capacity);
1420 return 0;
1421}
1422
1423static int btrfs_load_block_group_raid1(struct btrfs_block_group *bg,
1424 struct btrfs_chunk_map *map,
1425 struct zone_info *zone_info,
1426 unsigned long *active)
1427{
1428 struct btrfs_fs_info *fs_info = bg->fs_info;
1429 int i;
1430
1431 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
1432 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
1433 btrfs_bg_type_to_raid_name(map->type));
1434 return -EINVAL;
1435 }
1436
1437 for (i = 0; i < map->num_stripes; i++) {
1438 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
1439 zone_info[i].alloc_offset == WP_CONVENTIONAL)
1440 continue;
1441
1442 if ((zone_info[0].alloc_offset != zone_info[i].alloc_offset) &&
1443 !btrfs_test_opt(fs_info, DEGRADED)) {
1444 btrfs_err(fs_info,
1445 "zoned: write pointer offset mismatch of zones in %s profile",
1446 btrfs_bg_type_to_raid_name(map->type));
1447 return -EIO;
1448 }
1449 if (test_bit(0, active) != test_bit(i, active)) {
1450 if (!btrfs_test_opt(fs_info, DEGRADED) &&
1451 !btrfs_zone_activate(bg)) {
1452 return -EIO;
1453 }
1454 } else {
1455 if (test_bit(0, active))
1456 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
1457 }
1458 /* In case a device is missing we have a cap of 0, so don't use it. */
1459 bg->zone_capacity = min_not_zero(zone_info[0].capacity,
1460 zone_info[1].capacity);
1461 }
1462
1463 if (zone_info[0].alloc_offset != WP_MISSING_DEV)
1464 bg->alloc_offset = zone_info[0].alloc_offset;
1465 else
1466 bg->alloc_offset = zone_info[i - 1].alloc_offset;
1467
1468 return 0;
1469}
1470
1471static int btrfs_load_block_group_raid0(struct btrfs_block_group *bg,
1472 struct btrfs_chunk_map *map,
1473 struct zone_info *zone_info,
1474 unsigned long *active)
1475{
1476 struct btrfs_fs_info *fs_info = bg->fs_info;
1477
1478 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
1479 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
1480 btrfs_bg_type_to_raid_name(map->type));
1481 return -EINVAL;
1482 }
1483
1484 for (int i = 0; i < map->num_stripes; i++) {
1485 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
1486 zone_info[i].alloc_offset == WP_CONVENTIONAL)
1487 continue;
1488
1489 if (test_bit(0, active) != test_bit(i, active)) {
1490 if (!btrfs_zone_activate(bg))
1491 return -EIO;
1492 } else {
1493 if (test_bit(0, active))
1494 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
1495 }
1496 bg->zone_capacity += zone_info[i].capacity;
1497 bg->alloc_offset += zone_info[i].alloc_offset;
1498 }
1499
1500 return 0;
1501}
1502
1503static int btrfs_load_block_group_raid10(struct btrfs_block_group *bg,
1504 struct btrfs_chunk_map *map,
1505 struct zone_info *zone_info,
1506 unsigned long *active)
1507{
1508 struct btrfs_fs_info *fs_info = bg->fs_info;
1509
1510 if ((map->type & BTRFS_BLOCK_GROUP_DATA) && !fs_info->stripe_root) {
1511 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
1512 btrfs_bg_type_to_raid_name(map->type));
1513 return -EINVAL;
1514 }
1515
1516 for (int i = 0; i < map->num_stripes; i++) {
1517 if (zone_info[i].alloc_offset == WP_MISSING_DEV ||
1518 zone_info[i].alloc_offset == WP_CONVENTIONAL)
1519 continue;
1520
1521 if (test_bit(0, active) != test_bit(i, active)) {
1522 if (!btrfs_zone_activate(bg))
1523 return -EIO;
1524 } else {
1525 if (test_bit(0, active))
1526 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &bg->runtime_flags);
1527 }
1528
1529 if ((i % map->sub_stripes) == 0) {
1530 bg->zone_capacity += zone_info[i].capacity;
1531 bg->alloc_offset += zone_info[i].alloc_offset;
1532 }
1533 }
1534
1535 return 0;
1536}
1537
1538int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
1539{
1540 struct btrfs_fs_info *fs_info = cache->fs_info;
1541 struct btrfs_chunk_map *map;
1542 u64 logical = cache->start;
1543 u64 length = cache->length;
1544 struct zone_info *zone_info = NULL;
1545 int ret;
1546 int i;
1547 unsigned long *active = NULL;
1548 u64 last_alloc = 0;
1549 u32 num_sequential = 0, num_conventional = 0;
1550
1551 if (!btrfs_is_zoned(fs_info))
1552 return 0;
1553
1554 /* Sanity check */
1555 if (!IS_ALIGNED(length, fs_info->zone_size)) {
1556 btrfs_err(fs_info,
1557 "zoned: block group %llu len %llu unaligned to zone size %llu",
1558 logical, length, fs_info->zone_size);
1559 return -EIO;
1560 }
1561
1562 map = btrfs_find_chunk_map(fs_info, logical, length);
1563 if (!map)
1564 return -EINVAL;
1565
1566 cache->physical_map = btrfs_clone_chunk_map(map, GFP_NOFS);
1567 if (!cache->physical_map) {
1568 ret = -ENOMEM;
1569 goto out;
1570 }
1571
1572 zone_info = kcalloc(map->num_stripes, sizeof(*zone_info), GFP_NOFS);
1573 if (!zone_info) {
1574 ret = -ENOMEM;
1575 goto out;
1576 }
1577
1578 active = bitmap_zalloc(map->num_stripes, GFP_NOFS);
1579 if (!active) {
1580 ret = -ENOMEM;
1581 goto out;
1582 }
1583
1584 for (i = 0; i < map->num_stripes; i++) {
1585 ret = btrfs_load_zone_info(fs_info, i, &zone_info[i], active, map);
1586 if (ret)
1587 goto out;
1588
1589 if (zone_info[i].alloc_offset == WP_CONVENTIONAL)
1590 num_conventional++;
1591 else
1592 num_sequential++;
1593 }
1594
1595 if (num_sequential > 0)
1596 set_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);
1597
1598 if (num_conventional > 0) {
1599 /* Zone capacity is always zone size in emulation */
1600 cache->zone_capacity = cache->length;
1601 ret = calculate_alloc_pointer(cache, &last_alloc, new);
1602 if (ret) {
1603 btrfs_err(fs_info,
1604 "zoned: failed to determine allocation offset of bg %llu",
1605 cache->start);
1606 goto out;
1607 } else if (map->num_stripes == num_conventional) {
1608 cache->alloc_offset = last_alloc;
1609 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags);
1610 goto out;
1611 }
1612 }
1613
1614 switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1615 case 0: /* single */
1616 ret = btrfs_load_block_group_single(cache, &zone_info[0], active);
1617 break;
1618 case BTRFS_BLOCK_GROUP_DUP:
1619 ret = btrfs_load_block_group_dup(cache, map, zone_info, active);
1620 break;
1621 case BTRFS_BLOCK_GROUP_RAID1:
1622 case BTRFS_BLOCK_GROUP_RAID1C3:
1623 case BTRFS_BLOCK_GROUP_RAID1C4:
1624 ret = btrfs_load_block_group_raid1(cache, map, zone_info, active);
1625 break;
1626 case BTRFS_BLOCK_GROUP_RAID0:
1627 ret = btrfs_load_block_group_raid0(cache, map, zone_info, active);
1628 break;
1629 case BTRFS_BLOCK_GROUP_RAID10:
1630 ret = btrfs_load_block_group_raid10(cache, map, zone_info, active);
1631 break;
1632 case BTRFS_BLOCK_GROUP_RAID5:
1633 case BTRFS_BLOCK_GROUP_RAID6:
1634 default:
1635 btrfs_err(fs_info, "zoned: profile %s not yet supported",
1636 btrfs_bg_type_to_raid_name(map->type));
1637 ret = -EINVAL;
1638 goto out;
1639 }
1640
1641out:
1642 /* Reject non SINGLE data profiles without RST */
1643 if ((map->type & BTRFS_BLOCK_GROUP_DATA) &&
1644 (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) &&
1645 !fs_info->stripe_root) {
1646 btrfs_err(fs_info, "zoned: data %s needs raid-stripe-tree",
1647 btrfs_bg_type_to_raid_name(map->type));
1648 return -EINVAL;
1649 }
1650
1651 if (cache->alloc_offset > cache->zone_capacity) {
1652 btrfs_err(fs_info,
1653"zoned: invalid write pointer %llu (larger than zone capacity %llu) in block group %llu",
1654 cache->alloc_offset, cache->zone_capacity,
1655 cache->start);
1656 ret = -EIO;
1657 }
1658
1659 /* An extent is allocated after the write pointer */
1660 if (!ret && num_conventional && last_alloc > cache->alloc_offset) {
1661 btrfs_err(fs_info,
1662 "zoned: got wrong write pointer in BG %llu: %llu > %llu",
1663 logical, last_alloc, cache->alloc_offset);
1664 ret = -EIO;
1665 }
1666
1667 if (!ret) {
1668 cache->meta_write_pointer = cache->alloc_offset + cache->start;
1669 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &cache->runtime_flags)) {
1670 btrfs_get_block_group(cache);
1671 spin_lock(&fs_info->zone_active_bgs_lock);
1672 list_add_tail(&cache->active_bg_list,
1673 &fs_info->zone_active_bgs);
1674 spin_unlock(&fs_info->zone_active_bgs_lock);
1675 }
1676 } else {
1677 btrfs_free_chunk_map(cache->physical_map);
1678 cache->physical_map = NULL;
1679 }
1680 bitmap_free(active);
1681 kfree(zone_info);
1682 btrfs_free_chunk_map(map);
1683
1684 return ret;
1685}
1686
1687void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)
1688{
1689 u64 unusable, free;
1690
1691 if (!btrfs_is_zoned(cache->fs_info))
1692 return;
1693
1694 WARN_ON(cache->bytes_super != 0);
1695 unusable = (cache->alloc_offset - cache->used) +
1696 (cache->length - cache->zone_capacity);
1697 free = cache->zone_capacity - cache->alloc_offset;
1698
1699 /* We only need ->free_space in ALLOC_SEQ block groups */
1700 cache->cached = BTRFS_CACHE_FINISHED;
1701 cache->free_space_ctl->free_space = free;
1702 cache->zone_unusable = unusable;
1703}
1704
1705bool btrfs_use_zone_append(struct btrfs_bio *bbio)
1706{
1707 u64 start = (bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT);
1708 struct btrfs_inode *inode = bbio->inode;
1709 struct btrfs_fs_info *fs_info = bbio->fs_info;
1710 struct btrfs_block_group *cache;
1711 bool ret = false;
1712
1713 if (!btrfs_is_zoned(fs_info))
1714 return false;
1715
1716 if (!inode || !is_data_inode(&inode->vfs_inode))
1717 return false;
1718
1719 if (btrfs_op(&bbio->bio) != BTRFS_MAP_WRITE)
1720 return false;
1721
1722 /*
1723 * Using REQ_OP_ZONE_APPNED for relocation can break assumptions on the
1724 * extent layout the relocation code has.
1725 * Furthermore we have set aside own block-group from which only the
1726 * relocation "process" can allocate and make sure only one process at a
1727 * time can add pages to an extent that gets relocated, so it's safe to
1728 * use regular REQ_OP_WRITE for this special case.
1729 */
1730 if (btrfs_is_data_reloc_root(inode->root))
1731 return false;
1732
1733 cache = btrfs_lookup_block_group(fs_info, start);
1734 ASSERT(cache);
1735 if (!cache)
1736 return false;
1737
1738 ret = !!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &cache->runtime_flags);
1739 btrfs_put_block_group(cache);
1740
1741 return ret;
1742}
1743
1744void btrfs_record_physical_zoned(struct btrfs_bio *bbio)
1745{
1746 const u64 physical = bbio->bio.bi_iter.bi_sector << SECTOR_SHIFT;
1747 struct btrfs_ordered_sum *sum = bbio->sums;
1748
1749 if (physical < bbio->orig_physical)
1750 sum->logical -= bbio->orig_physical - physical;
1751 else
1752 sum->logical += physical - bbio->orig_physical;
1753}
1754
1755static void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered,
1756 u64 logical)
1757{
1758 struct extent_map_tree *em_tree = &BTRFS_I(ordered->inode)->extent_tree;
1759 struct extent_map *em;
1760
1761 ordered->disk_bytenr = logical;
1762
1763 write_lock(&em_tree->lock);
1764 em = search_extent_mapping(em_tree, ordered->file_offset,
1765 ordered->num_bytes);
1766 em->block_start = logical;
1767 free_extent_map(em);
1768 write_unlock(&em_tree->lock);
1769}
1770
1771static bool btrfs_zoned_split_ordered(struct btrfs_ordered_extent *ordered,
1772 u64 logical, u64 len)
1773{
1774 struct btrfs_ordered_extent *new;
1775
1776 if (!test_bit(BTRFS_ORDERED_NOCOW, &ordered->flags) &&
1777 split_extent_map(BTRFS_I(ordered->inode), ordered->file_offset,
1778 ordered->num_bytes, len, logical))
1779 return false;
1780
1781 new = btrfs_split_ordered_extent(ordered, len);
1782 if (IS_ERR(new))
1783 return false;
1784 new->disk_bytenr = logical;
1785 btrfs_finish_one_ordered(new);
1786 return true;
1787}
1788
1789void btrfs_finish_ordered_zoned(struct btrfs_ordered_extent *ordered)
1790{
1791 struct btrfs_inode *inode = BTRFS_I(ordered->inode);
1792 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1793 struct btrfs_ordered_sum *sum;
1794 u64 logical, len;
1795
1796 /*
1797 * Write to pre-allocated region is for the data relocation, and so
1798 * it should use WRITE operation. No split/rewrite are necessary.
1799 */
1800 if (test_bit(BTRFS_ORDERED_PREALLOC, &ordered->flags))
1801 return;
1802
1803 ASSERT(!list_empty(&ordered->list));
1804 /* The ordered->list can be empty in the above pre-alloc case. */
1805 sum = list_first_entry(&ordered->list, struct btrfs_ordered_sum, list);
1806 logical = sum->logical;
1807 len = sum->len;
1808
1809 while (len < ordered->disk_num_bytes) {
1810 sum = list_next_entry(sum, list);
1811 if (sum->logical == logical + len) {
1812 len += sum->len;
1813 continue;
1814 }
1815 if (!btrfs_zoned_split_ordered(ordered, logical, len)) {
1816 set_bit(BTRFS_ORDERED_IOERR, &ordered->flags);
1817 btrfs_err(fs_info, "failed to split ordered extent");
1818 goto out;
1819 }
1820 logical = sum->logical;
1821 len = sum->len;
1822 }
1823
1824 if (ordered->disk_bytenr != logical)
1825 btrfs_rewrite_logical_zoned(ordered, logical);
1826
1827out:
1828 /*
1829 * If we end up here for nodatasum I/O, the btrfs_ordered_sum structures
1830 * were allocated by btrfs_alloc_dummy_sum only to record the logical
1831 * addresses and don't contain actual checksums. We thus must free them
1832 * here so that we don't attempt to log the csums later.
1833 */
1834 if ((inode->flags & BTRFS_INODE_NODATASUM) ||
1835 test_bit(BTRFS_FS_STATE_NO_CSUMS, &fs_info->fs_state)) {
1836 while ((sum = list_first_entry_or_null(&ordered->list,
1837 typeof(*sum), list))) {
1838 list_del(&sum->list);
1839 kfree(sum);
1840 }
1841 }
1842}
1843
1844static bool check_bg_is_active(struct btrfs_eb_write_context *ctx,
1845 struct btrfs_block_group **active_bg)
1846{
1847 const struct writeback_control *wbc = ctx->wbc;
1848 struct btrfs_block_group *block_group = ctx->zoned_bg;
1849 struct btrfs_fs_info *fs_info = block_group->fs_info;
1850
1851 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags))
1852 return true;
1853
1854 if (fs_info->treelog_bg == block_group->start) {
1855 if (!btrfs_zone_activate(block_group)) {
1856 int ret_fin = btrfs_zone_finish_one_bg(fs_info);
1857
1858 if (ret_fin != 1 || !btrfs_zone_activate(block_group))
1859 return false;
1860 }
1861 } else if (*active_bg != block_group) {
1862 struct btrfs_block_group *tgt = *active_bg;
1863
1864 /* zoned_meta_io_lock protects fs_info->active_{meta,system}_bg. */
1865 lockdep_assert_held(&fs_info->zoned_meta_io_lock);
1866
1867 if (tgt) {
1868 /*
1869 * If there is an unsent IO left in the allocated area,
1870 * we cannot wait for them as it may cause a deadlock.
1871 */
1872 if (tgt->meta_write_pointer < tgt->start + tgt->alloc_offset) {
1873 if (wbc->sync_mode == WB_SYNC_NONE ||
1874 (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync))
1875 return false;
1876 }
1877
1878 /* Pivot active metadata/system block group. */
1879 btrfs_zoned_meta_io_unlock(fs_info);
1880 wait_eb_writebacks(tgt);
1881 do_zone_finish(tgt, true);
1882 btrfs_zoned_meta_io_lock(fs_info);
1883 if (*active_bg == tgt) {
1884 btrfs_put_block_group(tgt);
1885 *active_bg = NULL;
1886 }
1887 }
1888 if (!btrfs_zone_activate(block_group))
1889 return false;
1890 if (*active_bg != block_group) {
1891 ASSERT(*active_bg == NULL);
1892 *active_bg = block_group;
1893 btrfs_get_block_group(block_group);
1894 }
1895 }
1896
1897 return true;
1898}
1899
1900/*
1901 * Check if @ctx->eb is aligned to the write pointer.
1902 *
1903 * Return:
1904 * 0: @ctx->eb is at the write pointer. You can write it.
1905 * -EAGAIN: There is a hole. The caller should handle the case.
1906 * -EBUSY: There is a hole, but the caller can just bail out.
1907 */
1908int btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
1909 struct btrfs_eb_write_context *ctx)
1910{
1911 const struct writeback_control *wbc = ctx->wbc;
1912 const struct extent_buffer *eb = ctx->eb;
1913 struct btrfs_block_group *block_group = ctx->zoned_bg;
1914
1915 if (!btrfs_is_zoned(fs_info))
1916 return 0;
1917
1918 if (block_group) {
1919 if (block_group->start > eb->start ||
1920 block_group->start + block_group->length <= eb->start) {
1921 btrfs_put_block_group(block_group);
1922 block_group = NULL;
1923 ctx->zoned_bg = NULL;
1924 }
1925 }
1926
1927 if (!block_group) {
1928 block_group = btrfs_lookup_block_group(fs_info, eb->start);
1929 if (!block_group)
1930 return 0;
1931 ctx->zoned_bg = block_group;
1932 }
1933
1934 if (block_group->meta_write_pointer == eb->start) {
1935 struct btrfs_block_group **tgt;
1936
1937 if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
1938 return 0;
1939
1940 if (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM)
1941 tgt = &fs_info->active_system_bg;
1942 else
1943 tgt = &fs_info->active_meta_bg;
1944 if (check_bg_is_active(ctx, tgt))
1945 return 0;
1946 }
1947
1948 /*
1949 * Since we may release fs_info->zoned_meta_io_lock, someone can already
1950 * start writing this eb. In that case, we can just bail out.
1951 */
1952 if (block_group->meta_write_pointer > eb->start)
1953 return -EBUSY;
1954
1955 /* If for_sync, this hole will be filled with trasnsaction commit. */
1956 if (wbc->sync_mode == WB_SYNC_ALL && !wbc->for_sync)
1957 return -EAGAIN;
1958 return -EBUSY;
1959}
1960
1961int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
1962{
1963 if (!btrfs_dev_is_sequential(device, physical))
1964 return -EOPNOTSUPP;
1965
1966 return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
1967 length >> SECTOR_SHIFT, GFP_NOFS, 0);
1968}
1969
1970static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
1971 struct blk_zone *zone)
1972{
1973 struct btrfs_io_context *bioc = NULL;
1974 u64 mapped_length = PAGE_SIZE;
1975 unsigned int nofs_flag;
1976 int nmirrors;
1977 int i, ret;
1978
1979 ret = btrfs_map_block(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
1980 &mapped_length, &bioc, NULL, NULL);
1981 if (ret || !bioc || mapped_length < PAGE_SIZE) {
1982 ret = -EIO;
1983 goto out_put_bioc;
1984 }
1985
1986 if (bioc->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
1987 ret = -EINVAL;
1988 goto out_put_bioc;
1989 }
1990
1991 nofs_flag = memalloc_nofs_save();
1992 nmirrors = (int)bioc->num_stripes;
1993 for (i = 0; i < nmirrors; i++) {
1994 u64 physical = bioc->stripes[i].physical;
1995 struct btrfs_device *dev = bioc->stripes[i].dev;
1996
1997 /* Missing device */
1998 if (!dev->bdev)
1999 continue;
2000
2001 ret = btrfs_get_dev_zone(dev, physical, zone);
2002 /* Failing device */
2003 if (ret == -EIO || ret == -EOPNOTSUPP)
2004 continue;
2005 break;
2006 }
2007 memalloc_nofs_restore(nofs_flag);
2008out_put_bioc:
2009 btrfs_put_bioc(bioc);
2010 return ret;
2011}
2012
2013/*
2014 * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by
2015 * filling zeros between @physical_pos to a write pointer of dev-replace
2016 * source device.
2017 */
2018int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
2019 u64 physical_start, u64 physical_pos)
2020{
2021 struct btrfs_fs_info *fs_info = tgt_dev->fs_info;
2022 struct blk_zone zone;
2023 u64 length;
2024 u64 wp;
2025 int ret;
2026
2027 if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))
2028 return 0;
2029
2030 ret = read_zone_info(fs_info, logical, &zone);
2031 if (ret)
2032 return ret;
2033
2034 wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);
2035
2036 if (physical_pos == wp)
2037 return 0;
2038
2039 if (physical_pos > wp)
2040 return -EUCLEAN;
2041
2042 length = wp - physical_pos;
2043 return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
2044}
2045
2046/*
2047 * Activate block group and underlying device zones
2048 *
2049 * @block_group: the block group to activate
2050 *
2051 * Return: true on success, false otherwise
2052 */
2053bool btrfs_zone_activate(struct btrfs_block_group *block_group)
2054{
2055 struct btrfs_fs_info *fs_info = block_group->fs_info;
2056 struct btrfs_chunk_map *map;
2057 struct btrfs_device *device;
2058 u64 physical;
2059 const bool is_data = (block_group->flags & BTRFS_BLOCK_GROUP_DATA);
2060 bool ret;
2061 int i;
2062
2063 if (!btrfs_is_zoned(block_group->fs_info))
2064 return true;
2065
2066 map = block_group->physical_map;
2067
2068 spin_lock(&fs_info->zone_active_bgs_lock);
2069 spin_lock(&block_group->lock);
2070 if (test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
2071 ret = true;
2072 goto out_unlock;
2073 }
2074
2075 /* No space left */
2076 if (btrfs_zoned_bg_is_full(block_group)) {
2077 ret = false;
2078 goto out_unlock;
2079 }
2080
2081 for (i = 0; i < map->num_stripes; i++) {
2082 struct btrfs_zoned_device_info *zinfo;
2083 int reserved = 0;
2084
2085 device = map->stripes[i].dev;
2086 physical = map->stripes[i].physical;
2087 zinfo = device->zone_info;
2088
2089 if (zinfo->max_active_zones == 0)
2090 continue;
2091
2092 if (is_data)
2093 reserved = zinfo->reserved_active_zones;
2094 /*
2095 * For the data block group, leave active zones for one
2096 * metadata block group and one system block group.
2097 */
2098 if (atomic_read(&zinfo->active_zones_left) <= reserved) {
2099 ret = false;
2100 goto out_unlock;
2101 }
2102
2103 if (!btrfs_dev_set_active_zone(device, physical)) {
2104 /* Cannot activate the zone */
2105 ret = false;
2106 goto out_unlock;
2107 }
2108 if (!is_data)
2109 zinfo->reserved_active_zones--;
2110 }
2111
2112 /* Successfully activated all the zones */
2113 set_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
2114 spin_unlock(&block_group->lock);
2115
2116 /* For the active block group list */
2117 btrfs_get_block_group(block_group);
2118 list_add_tail(&block_group->active_bg_list, &fs_info->zone_active_bgs);
2119 spin_unlock(&fs_info->zone_active_bgs_lock);
2120
2121 return true;
2122
2123out_unlock:
2124 spin_unlock(&block_group->lock);
2125 spin_unlock(&fs_info->zone_active_bgs_lock);
2126 return ret;
2127}
2128
2129static void wait_eb_writebacks(struct btrfs_block_group *block_group)
2130{
2131 struct btrfs_fs_info *fs_info = block_group->fs_info;
2132 const u64 end = block_group->start + block_group->length;
2133 struct radix_tree_iter iter;
2134 struct extent_buffer *eb;
2135 void __rcu **slot;
2136
2137 rcu_read_lock();
2138 radix_tree_for_each_slot(slot, &fs_info->buffer_radix, &iter,
2139 block_group->start >> fs_info->sectorsize_bits) {
2140 eb = radix_tree_deref_slot(slot);
2141 if (!eb)
2142 continue;
2143 if (radix_tree_deref_retry(eb)) {
2144 slot = radix_tree_iter_retry(&iter);
2145 continue;
2146 }
2147
2148 if (eb->start < block_group->start)
2149 continue;
2150 if (eb->start >= end)
2151 break;
2152
2153 slot = radix_tree_iter_resume(slot, &iter);
2154 rcu_read_unlock();
2155 wait_on_extent_buffer_writeback(eb);
2156 rcu_read_lock();
2157 }
2158 rcu_read_unlock();
2159}
2160
2161static int do_zone_finish(struct btrfs_block_group *block_group, bool fully_written)
2162{
2163 struct btrfs_fs_info *fs_info = block_group->fs_info;
2164 struct btrfs_chunk_map *map;
2165 const bool is_metadata = (block_group->flags &
2166 (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM));
2167 int ret = 0;
2168 int i;
2169
2170 spin_lock(&block_group->lock);
2171 if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags)) {
2172 spin_unlock(&block_group->lock);
2173 return 0;
2174 }
2175
2176 /* Check if we have unwritten allocated space */
2177 if (is_metadata &&
2178 block_group->start + block_group->alloc_offset > block_group->meta_write_pointer) {
2179 spin_unlock(&block_group->lock);
2180 return -EAGAIN;
2181 }
2182
2183 /*
2184 * If we are sure that the block group is full (= no more room left for
2185 * new allocation) and the IO for the last usable block is completed, we
2186 * don't need to wait for the other IOs. This holds because we ensure
2187 * the sequential IO submissions using the ZONE_APPEND command for data
2188 * and block_group->meta_write_pointer for metadata.
2189 */
2190 if (!fully_written) {
2191 if (test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
2192 spin_unlock(&block_group->lock);
2193 return -EAGAIN;
2194 }
2195 spin_unlock(&block_group->lock);
2196
2197 ret = btrfs_inc_block_group_ro(block_group, false);
2198 if (ret)
2199 return ret;
2200
2201 /* Ensure all writes in this block group finish */
2202 btrfs_wait_block_group_reservations(block_group);
2203 /* No need to wait for NOCOW writers. Zoned mode does not allow that */
2204 btrfs_wait_ordered_roots(fs_info, U64_MAX, block_group->start,
2205 block_group->length);
2206 /* Wait for extent buffers to be written. */
2207 if (is_metadata)
2208 wait_eb_writebacks(block_group);
2209
2210 spin_lock(&block_group->lock);
2211
2212 /*
2213 * Bail out if someone already deactivated the block group, or
2214 * allocated space is left in the block group.
2215 */
2216 if (!test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
2217 &block_group->runtime_flags)) {
2218 spin_unlock(&block_group->lock);
2219 btrfs_dec_block_group_ro(block_group);
2220 return 0;
2221 }
2222
2223 if (block_group->reserved ||
2224 test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
2225 &block_group->runtime_flags)) {
2226 spin_unlock(&block_group->lock);
2227 btrfs_dec_block_group_ro(block_group);
2228 return -EAGAIN;
2229 }
2230 }
2231
2232 clear_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE, &block_group->runtime_flags);
2233 block_group->alloc_offset = block_group->zone_capacity;
2234 if (block_group->flags & (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM))
2235 block_group->meta_write_pointer = block_group->start +
2236 block_group->zone_capacity;
2237 block_group->free_space_ctl->free_space = 0;
2238 btrfs_clear_treelog_bg(block_group);
2239 btrfs_clear_data_reloc_bg(block_group);
2240 spin_unlock(&block_group->lock);
2241
2242 map = block_group->physical_map;
2243 for (i = 0; i < map->num_stripes; i++) {
2244 struct btrfs_device *device = map->stripes[i].dev;
2245 const u64 physical = map->stripes[i].physical;
2246 struct btrfs_zoned_device_info *zinfo = device->zone_info;
2247
2248 if (zinfo->max_active_zones == 0)
2249 continue;
2250
2251 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_FINISH,
2252 physical >> SECTOR_SHIFT,
2253 zinfo->zone_size >> SECTOR_SHIFT,
2254 GFP_NOFS);
2255
2256 if (ret)
2257 return ret;
2258
2259 if (!(block_group->flags & BTRFS_BLOCK_GROUP_DATA))
2260 zinfo->reserved_active_zones++;
2261 btrfs_dev_clear_active_zone(device, physical);
2262 }
2263
2264 if (!fully_written)
2265 btrfs_dec_block_group_ro(block_group);
2266
2267 spin_lock(&fs_info->zone_active_bgs_lock);
2268 ASSERT(!list_empty(&block_group->active_bg_list));
2269 list_del_init(&block_group->active_bg_list);
2270 spin_unlock(&fs_info->zone_active_bgs_lock);
2271
2272 /* For active_bg_list */
2273 btrfs_put_block_group(block_group);
2274
2275 clear_and_wake_up_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
2276
2277 return 0;
2278}
2279
2280int btrfs_zone_finish(struct btrfs_block_group *block_group)
2281{
2282 if (!btrfs_is_zoned(block_group->fs_info))
2283 return 0;
2284
2285 return do_zone_finish(block_group, false);
2286}
2287
2288bool btrfs_can_activate_zone(struct btrfs_fs_devices *fs_devices, u64 flags)
2289{
2290 struct btrfs_fs_info *fs_info = fs_devices->fs_info;
2291 struct btrfs_device *device;
2292 bool ret = false;
2293
2294 if (!btrfs_is_zoned(fs_info))
2295 return true;
2296
2297 /* Check if there is a device with active zones left */
2298 mutex_lock(&fs_info->chunk_mutex);
2299 spin_lock(&fs_info->zone_active_bgs_lock);
2300 list_for_each_entry(device, &fs_devices->alloc_list, dev_alloc_list) {
2301 struct btrfs_zoned_device_info *zinfo = device->zone_info;
2302 int reserved = 0;
2303
2304 if (!device->bdev)
2305 continue;
2306
2307 if (!zinfo->max_active_zones) {
2308 ret = true;
2309 break;
2310 }
2311
2312 if (flags & BTRFS_BLOCK_GROUP_DATA)
2313 reserved = zinfo->reserved_active_zones;
2314
2315 switch (flags & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
2316 case 0: /* single */
2317 ret = (atomic_read(&zinfo->active_zones_left) >= (1 + reserved));
2318 break;
2319 case BTRFS_BLOCK_GROUP_DUP:
2320 ret = (atomic_read(&zinfo->active_zones_left) >= (2 + reserved));
2321 break;
2322 }
2323 if (ret)
2324 break;
2325 }
2326 spin_unlock(&fs_info->zone_active_bgs_lock);
2327 mutex_unlock(&fs_info->chunk_mutex);
2328
2329 if (!ret)
2330 set_bit(BTRFS_FS_NEED_ZONE_FINISH, &fs_info->flags);
2331
2332 return ret;
2333}
2334
2335void btrfs_zone_finish_endio(struct btrfs_fs_info *fs_info, u64 logical, u64 length)
2336{
2337 struct btrfs_block_group *block_group;
2338 u64 min_alloc_bytes;
2339
2340 if (!btrfs_is_zoned(fs_info))
2341 return;
2342
2343 block_group = btrfs_lookup_block_group(fs_info, logical);
2344 ASSERT(block_group);
2345
2346 /* No MIXED_BG on zoned btrfs. */
2347 if (block_group->flags & BTRFS_BLOCK_GROUP_DATA)
2348 min_alloc_bytes = fs_info->sectorsize;
2349 else
2350 min_alloc_bytes = fs_info->nodesize;
2351
2352 /* Bail out if we can allocate more data from this block group. */
2353 if (logical + length + min_alloc_bytes <=
2354 block_group->start + block_group->zone_capacity)
2355 goto out;
2356
2357 do_zone_finish(block_group, true);
2358
2359out:
2360 btrfs_put_block_group(block_group);
2361}
2362
2363static void btrfs_zone_finish_endio_workfn(struct work_struct *work)
2364{
2365 struct btrfs_block_group *bg =
2366 container_of(work, struct btrfs_block_group, zone_finish_work);
2367
2368 wait_on_extent_buffer_writeback(bg->last_eb);
2369 free_extent_buffer(bg->last_eb);
2370 btrfs_zone_finish_endio(bg->fs_info, bg->start, bg->length);
2371 btrfs_put_block_group(bg);
2372}
2373
2374void btrfs_schedule_zone_finish_bg(struct btrfs_block_group *bg,
2375 struct extent_buffer *eb)
2376{
2377 if (!test_bit(BLOCK_GROUP_FLAG_SEQUENTIAL_ZONE, &bg->runtime_flags) ||
2378 eb->start + eb->len * 2 <= bg->start + bg->zone_capacity)
2379 return;
2380
2381 if (WARN_ON(bg->zone_finish_work.func == btrfs_zone_finish_endio_workfn)) {
2382 btrfs_err(bg->fs_info, "double scheduling of bg %llu zone finishing",
2383 bg->start);
2384 return;
2385 }
2386
2387 /* For the work */
2388 btrfs_get_block_group(bg);
2389 atomic_inc(&eb->refs);
2390 bg->last_eb = eb;
2391 INIT_WORK(&bg->zone_finish_work, btrfs_zone_finish_endio_workfn);
2392 queue_work(system_unbound_wq, &bg->zone_finish_work);
2393}
2394
2395void btrfs_clear_data_reloc_bg(struct btrfs_block_group *bg)
2396{
2397 struct btrfs_fs_info *fs_info = bg->fs_info;
2398
2399 spin_lock(&fs_info->relocation_bg_lock);
2400 if (fs_info->data_reloc_bg == bg->start)
2401 fs_info->data_reloc_bg = 0;
2402 spin_unlock(&fs_info->relocation_bg_lock);
2403}
2404
2405void btrfs_free_zone_cache(struct btrfs_fs_info *fs_info)
2406{
2407 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2408 struct btrfs_device *device;
2409
2410 if (!btrfs_is_zoned(fs_info))
2411 return;
2412
2413 mutex_lock(&fs_devices->device_list_mutex);
2414 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2415 if (device->zone_info) {
2416 vfree(device->zone_info->zone_cache);
2417 device->zone_info->zone_cache = NULL;
2418 }
2419 }
2420 mutex_unlock(&fs_devices->device_list_mutex);
2421}
2422
2423bool btrfs_zoned_should_reclaim(struct btrfs_fs_info *fs_info)
2424{
2425 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2426 struct btrfs_device *device;
2427 u64 used = 0;
2428 u64 total = 0;
2429 u64 factor;
2430
2431 ASSERT(btrfs_is_zoned(fs_info));
2432
2433 if (fs_info->bg_reclaim_threshold == 0)
2434 return false;
2435
2436 mutex_lock(&fs_devices->device_list_mutex);
2437 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2438 if (!device->bdev)
2439 continue;
2440
2441 total += device->disk_total_bytes;
2442 used += device->bytes_used;
2443 }
2444 mutex_unlock(&fs_devices->device_list_mutex);
2445
2446 factor = div64_u64(used * 100, total);
2447 return factor >= fs_info->bg_reclaim_threshold;
2448}
2449
2450void btrfs_zoned_release_data_reloc_bg(struct btrfs_fs_info *fs_info, u64 logical,
2451 u64 length)
2452{
2453 struct btrfs_block_group *block_group;
2454
2455 if (!btrfs_is_zoned(fs_info))
2456 return;
2457
2458 block_group = btrfs_lookup_block_group(fs_info, logical);
2459 /* It should be called on a previous data relocation block group. */
2460 ASSERT(block_group && (block_group->flags & BTRFS_BLOCK_GROUP_DATA));
2461
2462 spin_lock(&block_group->lock);
2463 if (!test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags))
2464 goto out;
2465
2466 /* All relocation extents are written. */
2467 if (block_group->start + block_group->alloc_offset == logical + length) {
2468 /*
2469 * Now, release this block group for further allocations and
2470 * zone finish.
2471 */
2472 clear_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC,
2473 &block_group->runtime_flags);
2474 }
2475
2476out:
2477 spin_unlock(&block_group->lock);
2478 btrfs_put_block_group(block_group);
2479}
2480
2481int btrfs_zone_finish_one_bg(struct btrfs_fs_info *fs_info)
2482{
2483 struct btrfs_block_group *block_group;
2484 struct btrfs_block_group *min_bg = NULL;
2485 u64 min_avail = U64_MAX;
2486 int ret;
2487
2488 spin_lock(&fs_info->zone_active_bgs_lock);
2489 list_for_each_entry(block_group, &fs_info->zone_active_bgs,
2490 active_bg_list) {
2491 u64 avail;
2492
2493 spin_lock(&block_group->lock);
2494 if (block_group->reserved || block_group->alloc_offset == 0 ||
2495 (block_group->flags & BTRFS_BLOCK_GROUP_SYSTEM) ||
2496 test_bit(BLOCK_GROUP_FLAG_ZONED_DATA_RELOC, &block_group->runtime_flags)) {
2497 spin_unlock(&block_group->lock);
2498 continue;
2499 }
2500
2501 avail = block_group->zone_capacity - block_group->alloc_offset;
2502 if (min_avail > avail) {
2503 if (min_bg)
2504 btrfs_put_block_group(min_bg);
2505 min_bg = block_group;
2506 min_avail = avail;
2507 btrfs_get_block_group(min_bg);
2508 }
2509 spin_unlock(&block_group->lock);
2510 }
2511 spin_unlock(&fs_info->zone_active_bgs_lock);
2512
2513 if (!min_bg)
2514 return 0;
2515
2516 ret = btrfs_zone_finish(min_bg);
2517 btrfs_put_block_group(min_bg);
2518
2519 return ret < 0 ? ret : 1;
2520}
2521
2522int btrfs_zoned_activate_one_bg(struct btrfs_fs_info *fs_info,
2523 struct btrfs_space_info *space_info,
2524 bool do_finish)
2525{
2526 struct btrfs_block_group *bg;
2527 int index;
2528
2529 if (!btrfs_is_zoned(fs_info) || (space_info->flags & BTRFS_BLOCK_GROUP_DATA))
2530 return 0;
2531
2532 for (;;) {
2533 int ret;
2534 bool need_finish = false;
2535
2536 down_read(&space_info->groups_sem);
2537 for (index = 0; index < BTRFS_NR_RAID_TYPES; index++) {
2538 list_for_each_entry(bg, &space_info->block_groups[index],
2539 list) {
2540 if (!spin_trylock(&bg->lock))
2541 continue;
2542 if (btrfs_zoned_bg_is_full(bg) ||
2543 test_bit(BLOCK_GROUP_FLAG_ZONE_IS_ACTIVE,
2544 &bg->runtime_flags)) {
2545 spin_unlock(&bg->lock);
2546 continue;
2547 }
2548 spin_unlock(&bg->lock);
2549
2550 if (btrfs_zone_activate(bg)) {
2551 up_read(&space_info->groups_sem);
2552 return 1;
2553 }
2554
2555 need_finish = true;
2556 }
2557 }
2558 up_read(&space_info->groups_sem);
2559
2560 if (!do_finish || !need_finish)
2561 break;
2562
2563 ret = btrfs_zone_finish_one_bg(fs_info);
2564 if (ret == 0)
2565 break;
2566 if (ret < 0)
2567 return ret;
2568 }
2569
2570 return 0;
2571}
2572
2573/*
2574 * Reserve zones for one metadata block group, one tree-log block group, and one
2575 * system block group.
2576 */
2577void btrfs_check_active_zone_reservation(struct btrfs_fs_info *fs_info)
2578{
2579 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
2580 struct btrfs_block_group *block_group;
2581 struct btrfs_device *device;
2582 /* Reserve zones for normal SINGLE metadata and tree-log block group. */
2583 unsigned int metadata_reserve = 2;
2584 /* Reserve a zone for SINGLE system block group. */
2585 unsigned int system_reserve = 1;
2586
2587 if (!test_bit(BTRFS_FS_ACTIVE_ZONE_TRACKING, &fs_info->flags))
2588 return;
2589
2590 /*
2591 * This function is called from the mount context. So, there is no
2592 * parallel process touching the bits. No need for read_seqretry().
2593 */
2594 if (fs_info->avail_metadata_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
2595 metadata_reserve = 4;
2596 if (fs_info->avail_system_alloc_bits & BTRFS_BLOCK_GROUP_DUP)
2597 system_reserve = 2;
2598
2599 /* Apply the reservation on all the devices. */
2600 mutex_lock(&fs_devices->device_list_mutex);
2601 list_for_each_entry(device, &fs_devices->devices, dev_list) {
2602 if (!device->bdev)
2603 continue;
2604
2605 device->zone_info->reserved_active_zones =
2606 metadata_reserve + system_reserve;
2607 }
2608 mutex_unlock(&fs_devices->device_list_mutex);
2609
2610 /* Release reservation for currently active block groups. */
2611 spin_lock(&fs_info->zone_active_bgs_lock);
2612 list_for_each_entry(block_group, &fs_info->zone_active_bgs, active_bg_list) {
2613 struct btrfs_chunk_map *map = block_group->physical_map;
2614
2615 if (!(block_group->flags &
2616 (BTRFS_BLOCK_GROUP_METADATA | BTRFS_BLOCK_GROUP_SYSTEM)))
2617 continue;
2618
2619 for (int i = 0; i < map->num_stripes; i++)
2620 map->stripes[i].dev->zone_info->reserved_active_zones--;
2621 }
2622 spin_unlock(&fs_info->zone_active_bgs_lock);
2623}
1// SPDX-License-Identifier: GPL-2.0
2
3#include <linux/bitops.h>
4#include <linux/slab.h>
5#include <linux/blkdev.h>
6#include <linux/sched/mm.h>
7#include "ctree.h"
8#include "volumes.h"
9#include "zoned.h"
10#include "rcu-string.h"
11#include "disk-io.h"
12#include "block-group.h"
13#include "transaction.h"
14#include "dev-replace.h"
15#include "space-info.h"
16
17/* Maximum number of zones to report per blkdev_report_zones() call */
18#define BTRFS_REPORT_NR_ZONES 4096
19/* Invalid allocation pointer value for missing devices */
20#define WP_MISSING_DEV ((u64)-1)
21/* Pseudo write pointer value for conventional zone */
22#define WP_CONVENTIONAL ((u64)-2)
23
24/*
25 * Location of the first zone of superblock logging zone pairs.
26 *
27 * - primary superblock: 0B (zone 0)
28 * - first copy: 512G (zone starting at that offset)
29 * - second copy: 4T (zone starting at that offset)
30 */
31#define BTRFS_SB_LOG_PRIMARY_OFFSET (0ULL)
32#define BTRFS_SB_LOG_FIRST_OFFSET (512ULL * SZ_1G)
33#define BTRFS_SB_LOG_SECOND_OFFSET (4096ULL * SZ_1G)
34
35#define BTRFS_SB_LOG_FIRST_SHIFT const_ilog2(BTRFS_SB_LOG_FIRST_OFFSET)
36#define BTRFS_SB_LOG_SECOND_SHIFT const_ilog2(BTRFS_SB_LOG_SECOND_OFFSET)
37
38/* Number of superblock log zones */
39#define BTRFS_NR_SB_LOG_ZONES 2
40
41/*
42 * Maximum supported zone size. Currently, SMR disks have a zone size of
43 * 256MiB, and we are expecting ZNS drives to be in the 1-4GiB range. We do not
44 * expect the zone size to become larger than 8GiB in the near future.
45 */
46#define BTRFS_MAX_ZONE_SIZE SZ_8G
47
48static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
49{
50 struct blk_zone *zones = data;
51
52 memcpy(&zones[idx], zone, sizeof(*zone));
53
54 return 0;
55}
56
57static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
58 u64 *wp_ret)
59{
60 bool empty[BTRFS_NR_SB_LOG_ZONES];
61 bool full[BTRFS_NR_SB_LOG_ZONES];
62 sector_t sector;
63
64 ASSERT(zones[0].type != BLK_ZONE_TYPE_CONVENTIONAL &&
65 zones[1].type != BLK_ZONE_TYPE_CONVENTIONAL);
66
67 empty[0] = (zones[0].cond == BLK_ZONE_COND_EMPTY);
68 empty[1] = (zones[1].cond == BLK_ZONE_COND_EMPTY);
69 full[0] = (zones[0].cond == BLK_ZONE_COND_FULL);
70 full[1] = (zones[1].cond == BLK_ZONE_COND_FULL);
71
72 /*
73 * Possible states of log buffer zones
74 *
75 * Empty[0] In use[0] Full[0]
76 * Empty[1] * x 0
77 * In use[1] 0 x 0
78 * Full[1] 1 1 C
79 *
80 * Log position:
81 * *: Special case, no superblock is written
82 * 0: Use write pointer of zones[0]
83 * 1: Use write pointer of zones[1]
84 * C: Compare super blocks from zones[0] and zones[1], use the latest
85 * one determined by generation
86 * x: Invalid state
87 */
88
89 if (empty[0] && empty[1]) {
90 /* Special case to distinguish no superblock to read */
91 *wp_ret = zones[0].start << SECTOR_SHIFT;
92 return -ENOENT;
93 } else if (full[0] && full[1]) {
94 /* Compare two super blocks */
95 struct address_space *mapping = bdev->bd_inode->i_mapping;
96 struct page *page[BTRFS_NR_SB_LOG_ZONES];
97 struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
98 int i;
99
100 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
101 u64 bytenr;
102
103 bytenr = ((zones[i].start + zones[i].len)
104 << SECTOR_SHIFT) - BTRFS_SUPER_INFO_SIZE;
105
106 page[i] = read_cache_page_gfp(mapping,
107 bytenr >> PAGE_SHIFT, GFP_NOFS);
108 if (IS_ERR(page[i])) {
109 if (i == 1)
110 btrfs_release_disk_super(super[0]);
111 return PTR_ERR(page[i]);
112 }
113 super[i] = page_address(page[i]);
114 }
115
116 if (super[0]->generation > super[1]->generation)
117 sector = zones[1].start;
118 else
119 sector = zones[0].start;
120
121 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
122 btrfs_release_disk_super(super[i]);
123 } else if (!full[0] && (empty[1] || full[1])) {
124 sector = zones[0].wp;
125 } else if (full[0]) {
126 sector = zones[1].wp;
127 } else {
128 return -EUCLEAN;
129 }
130 *wp_ret = sector << SECTOR_SHIFT;
131 return 0;
132}
133
134/*
135 * Get the first zone number of the superblock mirror
136 */
137static inline u32 sb_zone_number(int shift, int mirror)
138{
139 u64 zone;
140
141 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
142 switch (mirror) {
143 case 0: zone = 0; break;
144 case 1: zone = 1ULL << (BTRFS_SB_LOG_FIRST_SHIFT - shift); break;
145 case 2: zone = 1ULL << (BTRFS_SB_LOG_SECOND_SHIFT - shift); break;
146 }
147
148 ASSERT(zone <= U32_MAX);
149
150 return (u32)zone;
151}
152
153static inline sector_t zone_start_sector(u32 zone_number,
154 struct block_device *bdev)
155{
156 return (sector_t)zone_number << ilog2(bdev_zone_sectors(bdev));
157}
158
159static inline u64 zone_start_physical(u32 zone_number,
160 struct btrfs_zoned_device_info *zone_info)
161{
162 return (u64)zone_number << zone_info->zone_size_shift;
163}
164
165/*
166 * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
167 * device into static sized chunks and fake a conventional zone on each of
168 * them.
169 */
170static int emulate_report_zones(struct btrfs_device *device, u64 pos,
171 struct blk_zone *zones, unsigned int nr_zones)
172{
173 const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
174 sector_t bdev_size = bdev_nr_sectors(device->bdev);
175 unsigned int i;
176
177 pos >>= SECTOR_SHIFT;
178 for (i = 0; i < nr_zones; i++) {
179 zones[i].start = i * zone_sectors + pos;
180 zones[i].len = zone_sectors;
181 zones[i].capacity = zone_sectors;
182 zones[i].wp = zones[i].start + zone_sectors;
183 zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
184 zones[i].cond = BLK_ZONE_COND_NOT_WP;
185
186 if (zones[i].wp >= bdev_size) {
187 i++;
188 break;
189 }
190 }
191
192 return i;
193}
194
195static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
196 struct blk_zone *zones, unsigned int *nr_zones)
197{
198 int ret;
199
200 if (!*nr_zones)
201 return 0;
202
203 if (!bdev_is_zoned(device->bdev)) {
204 ret = emulate_report_zones(device, pos, zones, *nr_zones);
205 *nr_zones = ret;
206 return 0;
207 }
208
209 ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
210 copy_zone_info_cb, zones);
211 if (ret < 0) {
212 btrfs_err_in_rcu(device->fs_info,
213 "zoned: failed to read zone %llu on %s (devid %llu)",
214 pos, rcu_str_deref(device->name),
215 device->devid);
216 return ret;
217 }
218 *nr_zones = ret;
219 if (!ret)
220 return -EIO;
221
222 return 0;
223}
224
225/* The emulated zone size is determined from the size of device extent */
226static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
227{
228 struct btrfs_path *path;
229 struct btrfs_root *root = fs_info->dev_root;
230 struct btrfs_key key;
231 struct extent_buffer *leaf;
232 struct btrfs_dev_extent *dext;
233 int ret = 0;
234
235 key.objectid = 1;
236 key.type = BTRFS_DEV_EXTENT_KEY;
237 key.offset = 0;
238
239 path = btrfs_alloc_path();
240 if (!path)
241 return -ENOMEM;
242
243 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
244 if (ret < 0)
245 goto out;
246
247 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
248 ret = btrfs_next_item(root, path);
249 if (ret < 0)
250 goto out;
251 /* No dev extents at all? Not good */
252 if (ret > 0) {
253 ret = -EUCLEAN;
254 goto out;
255 }
256 }
257
258 leaf = path->nodes[0];
259 dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
260 fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
261 ret = 0;
262
263out:
264 btrfs_free_path(path);
265
266 return ret;
267}
268
269int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
270{
271 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
272 struct btrfs_device *device;
273 int ret = 0;
274
275 /* fs_info->zone_size might not set yet. Use the incomapt flag here. */
276 if (!btrfs_fs_incompat(fs_info, ZONED))
277 return 0;
278
279 mutex_lock(&fs_devices->device_list_mutex);
280 list_for_each_entry(device, &fs_devices->devices, dev_list) {
281 /* We can skip reading of zone info for missing devices */
282 if (!device->bdev)
283 continue;
284
285 ret = btrfs_get_dev_zone_info(device);
286 if (ret)
287 break;
288 }
289 mutex_unlock(&fs_devices->device_list_mutex);
290
291 return ret;
292}
293
294int btrfs_get_dev_zone_info(struct btrfs_device *device)
295{
296 struct btrfs_fs_info *fs_info = device->fs_info;
297 struct btrfs_zoned_device_info *zone_info = NULL;
298 struct block_device *bdev = device->bdev;
299 struct request_queue *queue = bdev_get_queue(bdev);
300 sector_t nr_sectors;
301 sector_t sector = 0;
302 struct blk_zone *zones = NULL;
303 unsigned int i, nreported = 0, nr_zones;
304 sector_t zone_sectors;
305 char *model, *emulated;
306 int ret;
307
308 /*
309 * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
310 * yet be set.
311 */
312 if (!btrfs_fs_incompat(fs_info, ZONED))
313 return 0;
314
315 if (device->zone_info)
316 return 0;
317
318 zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
319 if (!zone_info)
320 return -ENOMEM;
321
322 if (!bdev_is_zoned(bdev)) {
323 if (!fs_info->zone_size) {
324 ret = calculate_emulated_zone_size(fs_info);
325 if (ret)
326 goto out;
327 }
328
329 ASSERT(fs_info->zone_size);
330 zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
331 } else {
332 zone_sectors = bdev_zone_sectors(bdev);
333 }
334
335 /* Check if it's power of 2 (see is_power_of_2) */
336 ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
337 zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
338
339 /* We reject devices with a zone size larger than 8GB */
340 if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
341 btrfs_err_in_rcu(fs_info,
342 "zoned: %s: zone size %llu larger than supported maximum %llu",
343 rcu_str_deref(device->name),
344 zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
345 ret = -EINVAL;
346 goto out;
347 }
348
349 nr_sectors = bdev_nr_sectors(bdev);
350 zone_info->zone_size_shift = ilog2(zone_info->zone_size);
351 zone_info->max_zone_append_size =
352 (u64)queue_max_zone_append_sectors(queue) << SECTOR_SHIFT;
353 zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
354 if (!IS_ALIGNED(nr_sectors, zone_sectors))
355 zone_info->nr_zones++;
356
357 if (bdev_is_zoned(bdev) && zone_info->max_zone_append_size == 0) {
358 btrfs_err(fs_info, "zoned: device %pg does not support zone append",
359 bdev);
360 ret = -EINVAL;
361 goto out;
362 }
363
364 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
365 if (!zone_info->seq_zones) {
366 ret = -ENOMEM;
367 goto out;
368 }
369
370 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
371 if (!zone_info->empty_zones) {
372 ret = -ENOMEM;
373 goto out;
374 }
375
376 zones = kcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
377 if (!zones) {
378 ret = -ENOMEM;
379 goto out;
380 }
381
382 /* Get zones type */
383 while (sector < nr_sectors) {
384 nr_zones = BTRFS_REPORT_NR_ZONES;
385 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
386 &nr_zones);
387 if (ret)
388 goto out;
389
390 for (i = 0; i < nr_zones; i++) {
391 if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
392 __set_bit(nreported, zone_info->seq_zones);
393 if (zones[i].cond == BLK_ZONE_COND_EMPTY)
394 __set_bit(nreported, zone_info->empty_zones);
395 nreported++;
396 }
397 sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
398 }
399
400 if (nreported != zone_info->nr_zones) {
401 btrfs_err_in_rcu(device->fs_info,
402 "inconsistent number of zones on %s (%u/%u)",
403 rcu_str_deref(device->name), nreported,
404 zone_info->nr_zones);
405 ret = -EIO;
406 goto out;
407 }
408
409 /* Validate superblock log */
410 nr_zones = BTRFS_NR_SB_LOG_ZONES;
411 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
412 u32 sb_zone;
413 u64 sb_wp;
414 int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
415
416 sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
417 if (sb_zone + 1 >= zone_info->nr_zones)
418 continue;
419
420 ret = btrfs_get_dev_zones(device,
421 zone_start_physical(sb_zone, zone_info),
422 &zone_info->sb_zones[sb_pos],
423 &nr_zones);
424 if (ret)
425 goto out;
426
427 if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
428 btrfs_err_in_rcu(device->fs_info,
429 "zoned: failed to read super block log zone info at devid %llu zone %u",
430 device->devid, sb_zone);
431 ret = -EUCLEAN;
432 goto out;
433 }
434
435 /*
436 * If zones[0] is conventional, always use the beginning of the
437 * zone to record superblock. No need to validate in that case.
438 */
439 if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
440 BLK_ZONE_TYPE_CONVENTIONAL)
441 continue;
442
443 ret = sb_write_pointer(device->bdev,
444 &zone_info->sb_zones[sb_pos], &sb_wp);
445 if (ret != -ENOENT && ret) {
446 btrfs_err_in_rcu(device->fs_info,
447 "zoned: super block log zone corrupted devid %llu zone %u",
448 device->devid, sb_zone);
449 ret = -EUCLEAN;
450 goto out;
451 }
452 }
453
454
455 kfree(zones);
456
457 device->zone_info = zone_info;
458
459 switch (bdev_zoned_model(bdev)) {
460 case BLK_ZONED_HM:
461 model = "host-managed zoned";
462 emulated = "";
463 break;
464 case BLK_ZONED_HA:
465 model = "host-aware zoned";
466 emulated = "";
467 break;
468 case BLK_ZONED_NONE:
469 model = "regular";
470 emulated = "emulated ";
471 break;
472 default:
473 /* Just in case */
474 btrfs_err_in_rcu(fs_info, "zoned: unsupported model %d on %s",
475 bdev_zoned_model(bdev),
476 rcu_str_deref(device->name));
477 ret = -EOPNOTSUPP;
478 goto out_free_zone_info;
479 }
480
481 btrfs_info_in_rcu(fs_info,
482 "%s block device %s, %u %szones of %llu bytes",
483 model, rcu_str_deref(device->name), zone_info->nr_zones,
484 emulated, zone_info->zone_size);
485
486 return 0;
487
488out:
489 kfree(zones);
490out_free_zone_info:
491 bitmap_free(zone_info->empty_zones);
492 bitmap_free(zone_info->seq_zones);
493 kfree(zone_info);
494 device->zone_info = NULL;
495
496 return ret;
497}
498
499void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
500{
501 struct btrfs_zoned_device_info *zone_info = device->zone_info;
502
503 if (!zone_info)
504 return;
505
506 bitmap_free(zone_info->seq_zones);
507 bitmap_free(zone_info->empty_zones);
508 kfree(zone_info);
509 device->zone_info = NULL;
510}
511
512int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
513 struct blk_zone *zone)
514{
515 unsigned int nr_zones = 1;
516 int ret;
517
518 ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
519 if (ret != 0 || !nr_zones)
520 return ret ? ret : -EIO;
521
522 return 0;
523}
524
525int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
526{
527 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
528 struct btrfs_device *device;
529 u64 zoned_devices = 0;
530 u64 nr_devices = 0;
531 u64 zone_size = 0;
532 u64 max_zone_append_size = 0;
533 const bool incompat_zoned = btrfs_fs_incompat(fs_info, ZONED);
534 int ret = 0;
535
536 /* Count zoned devices */
537 list_for_each_entry(device, &fs_devices->devices, dev_list) {
538 enum blk_zoned_model model;
539
540 if (!device->bdev)
541 continue;
542
543 model = bdev_zoned_model(device->bdev);
544 /*
545 * A Host-Managed zoned device must be used as a zoned device.
546 * A Host-Aware zoned device and a non-zoned devices can be
547 * treated as a zoned device, if ZONED flag is enabled in the
548 * superblock.
549 */
550 if (model == BLK_ZONED_HM ||
551 (model == BLK_ZONED_HA && incompat_zoned) ||
552 (model == BLK_ZONED_NONE && incompat_zoned)) {
553 struct btrfs_zoned_device_info *zone_info =
554 device->zone_info;
555
556 zone_info = device->zone_info;
557 zoned_devices++;
558 if (!zone_size) {
559 zone_size = zone_info->zone_size;
560 } else if (zone_info->zone_size != zone_size) {
561 btrfs_err(fs_info,
562 "zoned: unequal block device zone sizes: have %llu found %llu",
563 device->zone_info->zone_size,
564 zone_size);
565 ret = -EINVAL;
566 goto out;
567 }
568 if (!max_zone_append_size ||
569 (zone_info->max_zone_append_size &&
570 zone_info->max_zone_append_size < max_zone_append_size))
571 max_zone_append_size =
572 zone_info->max_zone_append_size;
573 }
574 nr_devices++;
575 }
576
577 if (!zoned_devices && !incompat_zoned)
578 goto out;
579
580 if (!zoned_devices && incompat_zoned) {
581 /* No zoned block device found on ZONED filesystem */
582 btrfs_err(fs_info,
583 "zoned: no zoned devices found on a zoned filesystem");
584 ret = -EINVAL;
585 goto out;
586 }
587
588 if (zoned_devices && !incompat_zoned) {
589 btrfs_err(fs_info,
590 "zoned: mode not enabled but zoned device found");
591 ret = -EINVAL;
592 goto out;
593 }
594
595 if (zoned_devices != nr_devices) {
596 btrfs_err(fs_info,
597 "zoned: cannot mix zoned and regular devices");
598 ret = -EINVAL;
599 goto out;
600 }
601
602 /*
603 * stripe_size is always aligned to BTRFS_STRIPE_LEN in
604 * __btrfs_alloc_chunk(). Since we want stripe_len == zone_size,
605 * check the alignment here.
606 */
607 if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
608 btrfs_err(fs_info,
609 "zoned: zone size %llu not aligned to stripe %u",
610 zone_size, BTRFS_STRIPE_LEN);
611 ret = -EINVAL;
612 goto out;
613 }
614
615 if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
616 btrfs_err(fs_info, "zoned: mixed block groups not supported");
617 ret = -EINVAL;
618 goto out;
619 }
620
621 fs_info->zone_size = zone_size;
622 fs_info->max_zone_append_size = max_zone_append_size;
623 fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
624
625 /*
626 * Check mount options here, because we might change fs_info->zoned
627 * from fs_info->zone_size.
628 */
629 ret = btrfs_check_mountopts_zoned(fs_info);
630 if (ret)
631 goto out;
632
633 btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
634out:
635 return ret;
636}
637
638int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
639{
640 if (!btrfs_is_zoned(info))
641 return 0;
642
643 /*
644 * Space cache writing is not COWed. Disable that to avoid write errors
645 * in sequential zones.
646 */
647 if (btrfs_test_opt(info, SPACE_CACHE)) {
648 btrfs_err(info, "zoned: space cache v1 is not supported");
649 return -EINVAL;
650 }
651
652 if (btrfs_test_opt(info, NODATACOW)) {
653 btrfs_err(info, "zoned: NODATACOW not supported");
654 return -EINVAL;
655 }
656
657 return 0;
658}
659
660static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
661 int rw, u64 *bytenr_ret)
662{
663 u64 wp;
664 int ret;
665
666 if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {
667 *bytenr_ret = zones[0].start << SECTOR_SHIFT;
668 return 0;
669 }
670
671 ret = sb_write_pointer(bdev, zones, &wp);
672 if (ret != -ENOENT && ret < 0)
673 return ret;
674
675 if (rw == WRITE) {
676 struct blk_zone *reset = NULL;
677
678 if (wp == zones[0].start << SECTOR_SHIFT)
679 reset = &zones[0];
680 else if (wp == zones[1].start << SECTOR_SHIFT)
681 reset = &zones[1];
682
683 if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {
684 ASSERT(reset->cond == BLK_ZONE_COND_FULL);
685
686 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
687 reset->start, reset->len,
688 GFP_NOFS);
689 if (ret)
690 return ret;
691
692 reset->cond = BLK_ZONE_COND_EMPTY;
693 reset->wp = reset->start;
694 }
695 } else if (ret != -ENOENT) {
696 /* For READ, we want the precious one */
697 if (wp == zones[0].start << SECTOR_SHIFT)
698 wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT;
699 wp -= BTRFS_SUPER_INFO_SIZE;
700 }
701
702 *bytenr_ret = wp;
703 return 0;
704
705}
706
707int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
708 u64 *bytenr_ret)
709{
710 struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];
711 sector_t zone_sectors;
712 u32 sb_zone;
713 int ret;
714 u8 zone_sectors_shift;
715 sector_t nr_sectors;
716 u32 nr_zones;
717
718 if (!bdev_is_zoned(bdev)) {
719 *bytenr_ret = btrfs_sb_offset(mirror);
720 return 0;
721 }
722
723 ASSERT(rw == READ || rw == WRITE);
724
725 zone_sectors = bdev_zone_sectors(bdev);
726 if (!is_power_of_2(zone_sectors))
727 return -EINVAL;
728 zone_sectors_shift = ilog2(zone_sectors);
729 nr_sectors = bdev_nr_sectors(bdev);
730 nr_zones = nr_sectors >> zone_sectors_shift;
731
732 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
733 if (sb_zone + 1 >= nr_zones)
734 return -ENOENT;
735
736 ret = blkdev_report_zones(bdev, zone_start_sector(sb_zone, bdev),
737 BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,
738 zones);
739 if (ret < 0)
740 return ret;
741 if (ret != BTRFS_NR_SB_LOG_ZONES)
742 return -EIO;
743
744 return sb_log_location(bdev, zones, rw, bytenr_ret);
745}
746
747int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
748 u64 *bytenr_ret)
749{
750 struct btrfs_zoned_device_info *zinfo = device->zone_info;
751 u32 zone_num;
752
753 /*
754 * For a zoned filesystem on a non-zoned block device, use the same
755 * super block locations as regular filesystem. Doing so, the super
756 * block can always be retrieved and the zoned flag of the volume
757 * detected from the super block information.
758 */
759 if (!bdev_is_zoned(device->bdev)) {
760 *bytenr_ret = btrfs_sb_offset(mirror);
761 return 0;
762 }
763
764 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
765 if (zone_num + 1 >= zinfo->nr_zones)
766 return -ENOENT;
767
768 return sb_log_location(device->bdev,
769 &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],
770 rw, bytenr_ret);
771}
772
773static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,
774 int mirror)
775{
776 u32 zone_num;
777
778 if (!zinfo)
779 return false;
780
781 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
782 if (zone_num + 1 >= zinfo->nr_zones)
783 return false;
784
785 if (!test_bit(zone_num, zinfo->seq_zones))
786 return false;
787
788 return true;
789}
790
791void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
792{
793 struct btrfs_zoned_device_info *zinfo = device->zone_info;
794 struct blk_zone *zone;
795
796 if (!is_sb_log_zone(zinfo, mirror))
797 return;
798
799 zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];
800 if (zone->cond != BLK_ZONE_COND_FULL) {
801 if (zone->cond == BLK_ZONE_COND_EMPTY)
802 zone->cond = BLK_ZONE_COND_IMP_OPEN;
803
804 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
805
806 if (zone->wp == zone->start + zone->len)
807 zone->cond = BLK_ZONE_COND_FULL;
808
809 return;
810 }
811
812 zone++;
813 ASSERT(zone->cond != BLK_ZONE_COND_FULL);
814 if (zone->cond == BLK_ZONE_COND_EMPTY)
815 zone->cond = BLK_ZONE_COND_IMP_OPEN;
816
817 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
818
819 if (zone->wp == zone->start + zone->len)
820 zone->cond = BLK_ZONE_COND_FULL;
821}
822
823int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
824{
825 sector_t zone_sectors;
826 sector_t nr_sectors;
827 u8 zone_sectors_shift;
828 u32 sb_zone;
829 u32 nr_zones;
830
831 zone_sectors = bdev_zone_sectors(bdev);
832 zone_sectors_shift = ilog2(zone_sectors);
833 nr_sectors = bdev_nr_sectors(bdev);
834 nr_zones = nr_sectors >> zone_sectors_shift;
835
836 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
837 if (sb_zone + 1 >= nr_zones)
838 return -ENOENT;
839
840 return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
841 zone_start_sector(sb_zone, bdev),
842 zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
843}
844
845/**
846 * btrfs_find_allocatable_zones - find allocatable zones within a given region
847 *
848 * @device: the device to allocate a region on
849 * @hole_start: the position of the hole to allocate the region
850 * @num_bytes: size of wanted region
851 * @hole_end: the end of the hole
852 * @return: position of allocatable zones
853 *
854 * Allocatable region should not contain any superblock locations.
855 */
856u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
857 u64 hole_end, u64 num_bytes)
858{
859 struct btrfs_zoned_device_info *zinfo = device->zone_info;
860 const u8 shift = zinfo->zone_size_shift;
861 u64 nzones = num_bytes >> shift;
862 u64 pos = hole_start;
863 u64 begin, end;
864 bool have_sb;
865 int i;
866
867 ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
868 ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
869
870 while (pos < hole_end) {
871 begin = pos >> shift;
872 end = begin + nzones;
873
874 if (end > zinfo->nr_zones)
875 return hole_end;
876
877 /* Check if zones in the region are all empty */
878 if (btrfs_dev_is_sequential(device, pos) &&
879 find_next_zero_bit(zinfo->empty_zones, end, begin) != end) {
880 pos += zinfo->zone_size;
881 continue;
882 }
883
884 have_sb = false;
885 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
886 u32 sb_zone;
887 u64 sb_pos;
888
889 sb_zone = sb_zone_number(shift, i);
890 if (!(end <= sb_zone ||
891 sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
892 have_sb = true;
893 pos = zone_start_physical(
894 sb_zone + BTRFS_NR_SB_LOG_ZONES, zinfo);
895 break;
896 }
897
898 /* We also need to exclude regular superblock positions */
899 sb_pos = btrfs_sb_offset(i);
900 if (!(pos + num_bytes <= sb_pos ||
901 sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
902 have_sb = true;
903 pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
904 zinfo->zone_size);
905 break;
906 }
907 }
908 if (!have_sb)
909 break;
910 }
911
912 return pos;
913}
914
915int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
916 u64 length, u64 *bytes)
917{
918 int ret;
919
920 *bytes = 0;
921 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
922 physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT,
923 GFP_NOFS);
924 if (ret)
925 return ret;
926
927 *bytes = length;
928 while (length) {
929 btrfs_dev_set_zone_empty(device, physical);
930 physical += device->zone_info->zone_size;
931 length -= device->zone_info->zone_size;
932 }
933
934 return 0;
935}
936
937int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
938{
939 struct btrfs_zoned_device_info *zinfo = device->zone_info;
940 const u8 shift = zinfo->zone_size_shift;
941 unsigned long begin = start >> shift;
942 unsigned long end = (start + size) >> shift;
943 u64 pos;
944 int ret;
945
946 ASSERT(IS_ALIGNED(start, zinfo->zone_size));
947 ASSERT(IS_ALIGNED(size, zinfo->zone_size));
948
949 if (end > zinfo->nr_zones)
950 return -ERANGE;
951
952 /* All the zones are conventional */
953 if (find_next_bit(zinfo->seq_zones, begin, end) == end)
954 return 0;
955
956 /* All the zones are sequential and empty */
957 if (find_next_zero_bit(zinfo->seq_zones, begin, end) == end &&
958 find_next_zero_bit(zinfo->empty_zones, begin, end) == end)
959 return 0;
960
961 for (pos = start; pos < start + size; pos += zinfo->zone_size) {
962 u64 reset_bytes;
963
964 if (!btrfs_dev_is_sequential(device, pos) ||
965 btrfs_dev_is_empty_zone(device, pos))
966 continue;
967
968 /* Free regions should be empty */
969 btrfs_warn_in_rcu(
970 device->fs_info,
971 "zoned: resetting device %s (devid %llu) zone %llu for allocation",
972 rcu_str_deref(device->name), device->devid, pos >> shift);
973 WARN_ON_ONCE(1);
974
975 ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
976 &reset_bytes);
977 if (ret)
978 return ret;
979 }
980
981 return 0;
982}
983
984/*
985 * Calculate an allocation pointer from the extent allocation information
986 * for a block group consist of conventional zones. It is pointed to the
987 * end of the highest addressed extent in the block group as an allocation
988 * offset.
989 */
990static int calculate_alloc_pointer(struct btrfs_block_group *cache,
991 u64 *offset_ret)
992{
993 struct btrfs_fs_info *fs_info = cache->fs_info;
994 struct btrfs_root *root = fs_info->extent_root;
995 struct btrfs_path *path;
996 struct btrfs_key key;
997 struct btrfs_key found_key;
998 int ret;
999 u64 length;
1000
1001 path = btrfs_alloc_path();
1002 if (!path)
1003 return -ENOMEM;
1004
1005 key.objectid = cache->start + cache->length;
1006 key.type = 0;
1007 key.offset = 0;
1008
1009 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
1010 /* We should not find the exact match */
1011 if (!ret)
1012 ret = -EUCLEAN;
1013 if (ret < 0)
1014 goto out;
1015
1016 ret = btrfs_previous_extent_item(root, path, cache->start);
1017 if (ret) {
1018 if (ret == 1) {
1019 ret = 0;
1020 *offset_ret = 0;
1021 }
1022 goto out;
1023 }
1024
1025 btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
1026
1027 if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
1028 length = found_key.offset;
1029 else
1030 length = fs_info->nodesize;
1031
1032 if (!(found_key.objectid >= cache->start &&
1033 found_key.objectid + length <= cache->start + cache->length)) {
1034 ret = -EUCLEAN;
1035 goto out;
1036 }
1037 *offset_ret = found_key.objectid + length - cache->start;
1038 ret = 0;
1039
1040out:
1041 btrfs_free_path(path);
1042 return ret;
1043}
1044
1045int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
1046{
1047 struct btrfs_fs_info *fs_info = cache->fs_info;
1048 struct extent_map_tree *em_tree = &fs_info->mapping_tree;
1049 struct extent_map *em;
1050 struct map_lookup *map;
1051 struct btrfs_device *device;
1052 u64 logical = cache->start;
1053 u64 length = cache->length;
1054 u64 physical = 0;
1055 int ret;
1056 int i;
1057 unsigned int nofs_flag;
1058 u64 *alloc_offsets = NULL;
1059 u64 last_alloc = 0;
1060 u32 num_sequential = 0, num_conventional = 0;
1061
1062 if (!btrfs_is_zoned(fs_info))
1063 return 0;
1064
1065 /* Sanity check */
1066 if (!IS_ALIGNED(length, fs_info->zone_size)) {
1067 btrfs_err(fs_info,
1068 "zoned: block group %llu len %llu unaligned to zone size %llu",
1069 logical, length, fs_info->zone_size);
1070 return -EIO;
1071 }
1072
1073 /* Get the chunk mapping */
1074 read_lock(&em_tree->lock);
1075 em = lookup_extent_mapping(em_tree, logical, length);
1076 read_unlock(&em_tree->lock);
1077
1078 if (!em)
1079 return -EINVAL;
1080
1081 map = em->map_lookup;
1082
1083 alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS);
1084 if (!alloc_offsets) {
1085 free_extent_map(em);
1086 return -ENOMEM;
1087 }
1088
1089 for (i = 0; i < map->num_stripes; i++) {
1090 bool is_sequential;
1091 struct blk_zone zone;
1092 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
1093 int dev_replace_is_ongoing = 0;
1094
1095 device = map->stripes[i].dev;
1096 physical = map->stripes[i].physical;
1097
1098 if (device->bdev == NULL) {
1099 alloc_offsets[i] = WP_MISSING_DEV;
1100 continue;
1101 }
1102
1103 is_sequential = btrfs_dev_is_sequential(device, physical);
1104 if (is_sequential)
1105 num_sequential++;
1106 else
1107 num_conventional++;
1108
1109 if (!is_sequential) {
1110 alloc_offsets[i] = WP_CONVENTIONAL;
1111 continue;
1112 }
1113
1114 /*
1115 * This zone will be used for allocation, so mark this zone
1116 * non-empty.
1117 */
1118 btrfs_dev_clear_zone_empty(device, physical);
1119
1120 down_read(&dev_replace->rwsem);
1121 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
1122 if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
1123 btrfs_dev_clear_zone_empty(dev_replace->tgtdev, physical);
1124 up_read(&dev_replace->rwsem);
1125
1126 /*
1127 * The group is mapped to a sequential zone. Get the zone write
1128 * pointer to determine the allocation offset within the zone.
1129 */
1130 WARN_ON(!IS_ALIGNED(physical, fs_info->zone_size));
1131 nofs_flag = memalloc_nofs_save();
1132 ret = btrfs_get_dev_zone(device, physical, &zone);
1133 memalloc_nofs_restore(nofs_flag);
1134 if (ret == -EIO || ret == -EOPNOTSUPP) {
1135 ret = 0;
1136 alloc_offsets[i] = WP_MISSING_DEV;
1137 continue;
1138 } else if (ret) {
1139 goto out;
1140 }
1141
1142 if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) {
1143 btrfs_err_in_rcu(fs_info,
1144 "zoned: unexpected conventional zone %llu on device %s (devid %llu)",
1145 zone.start << SECTOR_SHIFT,
1146 rcu_str_deref(device->name), device->devid);
1147 ret = -EIO;
1148 goto out;
1149 }
1150
1151 switch (zone.cond) {
1152 case BLK_ZONE_COND_OFFLINE:
1153 case BLK_ZONE_COND_READONLY:
1154 btrfs_err(fs_info,
1155 "zoned: offline/readonly zone %llu on device %s (devid %llu)",
1156 physical >> device->zone_info->zone_size_shift,
1157 rcu_str_deref(device->name), device->devid);
1158 alloc_offsets[i] = WP_MISSING_DEV;
1159 break;
1160 case BLK_ZONE_COND_EMPTY:
1161 alloc_offsets[i] = 0;
1162 break;
1163 case BLK_ZONE_COND_FULL:
1164 alloc_offsets[i] = fs_info->zone_size;
1165 break;
1166 default:
1167 /* Partially used zone */
1168 alloc_offsets[i] =
1169 ((zone.wp - zone.start) << SECTOR_SHIFT);
1170 break;
1171 }
1172 }
1173
1174 if (num_sequential > 0)
1175 cache->seq_zone = true;
1176
1177 if (num_conventional > 0) {
1178 /*
1179 * Avoid calling calculate_alloc_pointer() for new BG. It
1180 * is no use for new BG. It must be always 0.
1181 *
1182 * Also, we have a lock chain of extent buffer lock ->
1183 * chunk mutex. For new BG, this function is called from
1184 * btrfs_make_block_group() which is already taking the
1185 * chunk mutex. Thus, we cannot call
1186 * calculate_alloc_pointer() which takes extent buffer
1187 * locks to avoid deadlock.
1188 */
1189 if (new) {
1190 cache->alloc_offset = 0;
1191 goto out;
1192 }
1193 ret = calculate_alloc_pointer(cache, &last_alloc);
1194 if (ret || map->num_stripes == num_conventional) {
1195 if (!ret)
1196 cache->alloc_offset = last_alloc;
1197 else
1198 btrfs_err(fs_info,
1199 "zoned: failed to determine allocation offset of bg %llu",
1200 cache->start);
1201 goto out;
1202 }
1203 }
1204
1205 switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1206 case 0: /* single */
1207 if (alloc_offsets[0] == WP_MISSING_DEV) {
1208 btrfs_err(fs_info,
1209 "zoned: cannot recover write pointer for zone %llu",
1210 physical);
1211 ret = -EIO;
1212 goto out;
1213 }
1214 cache->alloc_offset = alloc_offsets[0];
1215 break;
1216 case BTRFS_BLOCK_GROUP_DUP:
1217 case BTRFS_BLOCK_GROUP_RAID1:
1218 case BTRFS_BLOCK_GROUP_RAID0:
1219 case BTRFS_BLOCK_GROUP_RAID10:
1220 case BTRFS_BLOCK_GROUP_RAID5:
1221 case BTRFS_BLOCK_GROUP_RAID6:
1222 /* non-single profiles are not supported yet */
1223 default:
1224 btrfs_err(fs_info, "zoned: profile %s not yet supported",
1225 btrfs_bg_type_to_raid_name(map->type));
1226 ret = -EINVAL;
1227 goto out;
1228 }
1229
1230out:
1231 if (cache->alloc_offset > fs_info->zone_size) {
1232 btrfs_err(fs_info,
1233 "zoned: invalid write pointer %llu in block group %llu",
1234 cache->alloc_offset, cache->start);
1235 ret = -EIO;
1236 }
1237
1238 /* An extent is allocated after the write pointer */
1239 if (!ret && num_conventional && last_alloc > cache->alloc_offset) {
1240 btrfs_err(fs_info,
1241 "zoned: got wrong write pointer in BG %llu: %llu > %llu",
1242 logical, last_alloc, cache->alloc_offset);
1243 ret = -EIO;
1244 }
1245
1246 if (!ret)
1247 cache->meta_write_pointer = cache->alloc_offset + cache->start;
1248
1249 kfree(alloc_offsets);
1250 free_extent_map(em);
1251
1252 return ret;
1253}
1254
1255void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)
1256{
1257 u64 unusable, free;
1258
1259 if (!btrfs_is_zoned(cache->fs_info))
1260 return;
1261
1262 WARN_ON(cache->bytes_super != 0);
1263 unusable = cache->alloc_offset - cache->used;
1264 free = cache->length - cache->alloc_offset;
1265
1266 /* We only need ->free_space in ALLOC_SEQ block groups */
1267 cache->last_byte_to_unpin = (u64)-1;
1268 cache->cached = BTRFS_CACHE_FINISHED;
1269 cache->free_space_ctl->free_space = free;
1270 cache->zone_unusable = unusable;
1271
1272 /* Should not have any excluded extents. Just in case, though */
1273 btrfs_free_excluded_extents(cache);
1274}
1275
1276void btrfs_redirty_list_add(struct btrfs_transaction *trans,
1277 struct extent_buffer *eb)
1278{
1279 struct btrfs_fs_info *fs_info = eb->fs_info;
1280
1281 if (!btrfs_is_zoned(fs_info) ||
1282 btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN) ||
1283 !list_empty(&eb->release_list))
1284 return;
1285
1286 set_extent_buffer_dirty(eb);
1287 set_extent_bits_nowait(&trans->dirty_pages, eb->start,
1288 eb->start + eb->len - 1, EXTENT_DIRTY);
1289 memzero_extent_buffer(eb, 0, eb->len);
1290 set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
1291
1292 spin_lock(&trans->releasing_ebs_lock);
1293 list_add_tail(&eb->release_list, &trans->releasing_ebs);
1294 spin_unlock(&trans->releasing_ebs_lock);
1295 atomic_inc(&eb->refs);
1296}
1297
1298void btrfs_free_redirty_list(struct btrfs_transaction *trans)
1299{
1300 spin_lock(&trans->releasing_ebs_lock);
1301 while (!list_empty(&trans->releasing_ebs)) {
1302 struct extent_buffer *eb;
1303
1304 eb = list_first_entry(&trans->releasing_ebs,
1305 struct extent_buffer, release_list);
1306 list_del_init(&eb->release_list);
1307 free_extent_buffer(eb);
1308 }
1309 spin_unlock(&trans->releasing_ebs_lock);
1310}
1311
1312bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
1313{
1314 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1315 struct btrfs_block_group *cache;
1316 bool ret = false;
1317
1318 if (!btrfs_is_zoned(fs_info))
1319 return false;
1320
1321 if (!fs_info->max_zone_append_size)
1322 return false;
1323
1324 if (!is_data_inode(&inode->vfs_inode))
1325 return false;
1326
1327 cache = btrfs_lookup_block_group(fs_info, start);
1328 ASSERT(cache);
1329 if (!cache)
1330 return false;
1331
1332 ret = cache->seq_zone;
1333 btrfs_put_block_group(cache);
1334
1335 return ret;
1336}
1337
1338void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
1339 struct bio *bio)
1340{
1341 struct btrfs_ordered_extent *ordered;
1342 const u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
1343
1344 if (bio_op(bio) != REQ_OP_ZONE_APPEND)
1345 return;
1346
1347 ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), file_offset);
1348 if (WARN_ON(!ordered))
1349 return;
1350
1351 ordered->physical = physical;
1352 ordered->bdev = bio->bi_bdev;
1353
1354 btrfs_put_ordered_extent(ordered);
1355}
1356
1357void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered)
1358{
1359 struct btrfs_inode *inode = BTRFS_I(ordered->inode);
1360 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1361 struct extent_map_tree *em_tree;
1362 struct extent_map *em;
1363 struct btrfs_ordered_sum *sum;
1364 u64 orig_logical = ordered->disk_bytenr;
1365 u64 *logical = NULL;
1366 int nr, stripe_len;
1367
1368 /* Zoned devices should not have partitions. So, we can assume it is 0 */
1369 ASSERT(!bdev_is_partition(ordered->bdev));
1370 if (WARN_ON(!ordered->bdev))
1371 return;
1372
1373 if (WARN_ON(btrfs_rmap_block(fs_info, orig_logical, ordered->bdev,
1374 ordered->physical, &logical, &nr,
1375 &stripe_len)))
1376 goto out;
1377
1378 WARN_ON(nr != 1);
1379
1380 if (orig_logical == *logical)
1381 goto out;
1382
1383 ordered->disk_bytenr = *logical;
1384
1385 em_tree = &inode->extent_tree;
1386 write_lock(&em_tree->lock);
1387 em = search_extent_mapping(em_tree, ordered->file_offset,
1388 ordered->num_bytes);
1389 em->block_start = *logical;
1390 free_extent_map(em);
1391 write_unlock(&em_tree->lock);
1392
1393 list_for_each_entry(sum, &ordered->list, list) {
1394 if (*logical < orig_logical)
1395 sum->bytenr -= orig_logical - *logical;
1396 else
1397 sum->bytenr += *logical - orig_logical;
1398 }
1399
1400out:
1401 kfree(logical);
1402}
1403
1404bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
1405 struct extent_buffer *eb,
1406 struct btrfs_block_group **cache_ret)
1407{
1408 struct btrfs_block_group *cache;
1409 bool ret = true;
1410
1411 if (!btrfs_is_zoned(fs_info))
1412 return true;
1413
1414 cache = *cache_ret;
1415
1416 if (cache && (eb->start < cache->start ||
1417 cache->start + cache->length <= eb->start)) {
1418 btrfs_put_block_group(cache);
1419 cache = NULL;
1420 *cache_ret = NULL;
1421 }
1422
1423 if (!cache)
1424 cache = btrfs_lookup_block_group(fs_info, eb->start);
1425
1426 if (cache) {
1427 if (cache->meta_write_pointer != eb->start) {
1428 btrfs_put_block_group(cache);
1429 cache = NULL;
1430 ret = false;
1431 } else {
1432 cache->meta_write_pointer = eb->start + eb->len;
1433 }
1434
1435 *cache_ret = cache;
1436 }
1437
1438 return ret;
1439}
1440
1441void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
1442 struct extent_buffer *eb)
1443{
1444 if (!btrfs_is_zoned(eb->fs_info) || !cache)
1445 return;
1446
1447 ASSERT(cache->meta_write_pointer == eb->start + eb->len);
1448 cache->meta_write_pointer = eb->start;
1449}
1450
1451int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
1452{
1453 if (!btrfs_dev_is_sequential(device, physical))
1454 return -EOPNOTSUPP;
1455
1456 return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
1457 length >> SECTOR_SHIFT, GFP_NOFS, 0);
1458}
1459
1460static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
1461 struct blk_zone *zone)
1462{
1463 struct btrfs_bio *bbio = NULL;
1464 u64 mapped_length = PAGE_SIZE;
1465 unsigned int nofs_flag;
1466 int nmirrors;
1467 int i, ret;
1468
1469 ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
1470 &mapped_length, &bbio);
1471 if (ret || !bbio || mapped_length < PAGE_SIZE) {
1472 btrfs_put_bbio(bbio);
1473 return -EIO;
1474 }
1475
1476 if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK)
1477 return -EINVAL;
1478
1479 nofs_flag = memalloc_nofs_save();
1480 nmirrors = (int)bbio->num_stripes;
1481 for (i = 0; i < nmirrors; i++) {
1482 u64 physical = bbio->stripes[i].physical;
1483 struct btrfs_device *dev = bbio->stripes[i].dev;
1484
1485 /* Missing device */
1486 if (!dev->bdev)
1487 continue;
1488
1489 ret = btrfs_get_dev_zone(dev, physical, zone);
1490 /* Failing device */
1491 if (ret == -EIO || ret == -EOPNOTSUPP)
1492 continue;
1493 break;
1494 }
1495 memalloc_nofs_restore(nofs_flag);
1496
1497 return ret;
1498}
1499
1500/*
1501 * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by
1502 * filling zeros between @physical_pos to a write pointer of dev-replace
1503 * source device.
1504 */
1505int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
1506 u64 physical_start, u64 physical_pos)
1507{
1508 struct btrfs_fs_info *fs_info = tgt_dev->fs_info;
1509 struct blk_zone zone;
1510 u64 length;
1511 u64 wp;
1512 int ret;
1513
1514 if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))
1515 return 0;
1516
1517 ret = read_zone_info(fs_info, logical, &zone);
1518 if (ret)
1519 return ret;
1520
1521 wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);
1522
1523 if (physical_pos == wp)
1524 return 0;
1525
1526 if (physical_pos > wp)
1527 return -EUCLEAN;
1528
1529 length = wp - physical_pos;
1530 return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
1531}
1532
1533struct btrfs_device *btrfs_zoned_get_device(struct btrfs_fs_info *fs_info,
1534 u64 logical, u64 length)
1535{
1536 struct btrfs_device *device;
1537 struct extent_map *em;
1538 struct map_lookup *map;
1539
1540 em = btrfs_get_chunk_map(fs_info, logical, length);
1541 if (IS_ERR(em))
1542 return ERR_CAST(em);
1543
1544 map = em->map_lookup;
1545 /* We only support single profile for now */
1546 ASSERT(map->num_stripes == 1);
1547 device = map->stripes[0].dev;
1548
1549 free_extent_map(em);
1550
1551 return device;
1552}