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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 "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}