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