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btrfs: do not write supers if we have an fs error
[linux-block.git] / fs / btrfs / zoned.c
CommitLineData
5b316468
NA		 1// SPDX-License-Identifier: GPL-2.0
2
1cd6121f 3#include <linux/bitops.h>
5b316468
NA		 4#include <linux/slab.h>
5#include <linux/blkdev.h>
08e11a3d 6#include <linux/sched/mm.h>
5b316468
NA		 7#include "ctree.h"
8#include "volumes.h"
9#include "zoned.h"
10#include "rcu-string.h"
1cd6121f 11#include "disk-io.h"
08e11a3d 12#include "block-group.h"
d3575156 13#include "transaction.h"
6143c23c 14#include "dev-replace.h"
7db1c5d1 15#include "space-info.h"
5b316468
NA		 16
17/* Maximum number of zones to report per blkdev_report_zones() call */
18#define BTRFS_REPORT_NR_ZONES 4096
08e11a3d
NA		 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)
5b316468 23
53b74fa9
NA		 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
12659251
NA		 38/* Number of superblock log zones */
39#define BTRFS_NR_SB_LOG_ZONES 2
40
53b74fa9
NA		 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
5b316468
NA		 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
12659251
NA		 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 blcoks 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/*
53b74fa9 135 * Get the first zone number of the superblock mirror
12659251
NA		 136 */
137static inline u32 sb_zone_number(int shift, int mirror)
138{
53b74fa9 139 u64 zone;
12659251 140
53b74fa9 141 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
12659251 142 switch (mirror) {
53b74fa9
NA		 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;
12659251
NA		 146 }
147
53b74fa9
NA		 148 ASSERT(zone <= U32_MAX);
149
150 return (u32)zone;
12659251
NA		 151}
152
3c9daa09
JT		 153/*
154 * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
155 * device into static sized chunks and fake a conventional zone on each of
156 * them.
157 */
158static int emulate_report_zones(struct btrfs_device *device, u64 pos,
159 struct blk_zone *zones, unsigned int nr_zones)
160{
161 const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
162 sector_t bdev_size = bdev_nr_sectors(device->bdev);
163 unsigned int i;
164
165 pos >>= SECTOR_SHIFT;
166 for (i = 0; i < nr_zones; i++) {
167 zones[i].start = i * zone_sectors + pos;
168 zones[i].len = zone_sectors;
169 zones[i].capacity = zone_sectors;
170 zones[i].wp = zones[i].start + zone_sectors;
171 zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
172 zones[i].cond = BLK_ZONE_COND_NOT_WP;
173
174 if (zones[i].wp >= bdev_size) {
175 i++;
176 break;
177 }
178 }
179
180 return i;
181}
182
5b316468
NA		 183static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
184 struct blk_zone *zones, unsigned int *nr_zones)
185{
186 int ret;
187
188 if (!*nr_zones)
189 return 0;
190
3c9daa09
JT		 191 if (!bdev_is_zoned(device->bdev)) {
192 ret = emulate_report_zones(device, pos, zones, *nr_zones);
193 *nr_zones = ret;
194 return 0;
195 }
196
5b316468
NA		 197 ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
198 copy_zone_info_cb, zones);
199 if (ret < 0) {
200 btrfs_err_in_rcu(device->fs_info,
201 "zoned: failed to read zone %llu on %s (devid %llu)",
202 pos, rcu_str_deref(device->name),
203 device->devid);
204 return ret;
205 }
206 *nr_zones = ret;
207 if (!ret)
208 return -EIO;
209
210 return 0;
211}
212
3c9daa09
JT		 213/* The emulated zone size is determined from the size of device extent */
214static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
215{
216 struct btrfs_path *path;
217 struct btrfs_root *root = fs_info->dev_root;
218 struct btrfs_key key;
219 struct extent_buffer *leaf;
220 struct btrfs_dev_extent *dext;
221 int ret = 0;
222
223 key.objectid = 1;
224 key.type = BTRFS_DEV_EXTENT_KEY;
225 key.offset = 0;
226
227 path = btrfs_alloc_path();
228 if (!path)
229 return -ENOMEM;
230
231 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
232 if (ret < 0)
233 goto out;
234
235 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
236 ret = btrfs_next_item(root, path);
237 if (ret < 0)
238 goto out;
239 /* No dev extents at all? Not good */
240 if (ret > 0) {
241 ret = -EUCLEAN;
242 goto out;
243 }
244 }
245
246 leaf = path->nodes[0];
247 dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
248 fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
249 ret = 0;
250
251out:
252 btrfs_free_path(path);
253
254 return ret;
255}
256
73651042
NA		 257int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
258{
259 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
260 struct btrfs_device *device;
261 int ret = 0;
262
263 /* fs_info->zone_size might not set yet. Use the incomapt flag here. */
264 if (!btrfs_fs_incompat(fs_info, ZONED))
265 return 0;
266
267 mutex_lock(&fs_devices->device_list_mutex);
268 list_for_each_entry(device, &fs_devices->devices, dev_list) {
269 /* We can skip reading of zone info for missing devices */
270 if (!device->bdev)
271 continue;
272
273 ret = btrfs_get_dev_zone_info(device);
274 if (ret)
275 break;
276 }
277 mutex_unlock(&fs_devices->device_list_mutex);
278
279 return ret;
280}
281
5b316468
NA		 282int btrfs_get_dev_zone_info(struct btrfs_device *device)
283{
3c9daa09 284 struct btrfs_fs_info *fs_info = device->fs_info;
5b316468
NA		 285 struct btrfs_zoned_device_info *zone_info = NULL;
286 struct block_device *bdev = device->bdev;
862931c7 287 struct request_queue *queue = bdev_get_queue(bdev);
5b316468
NA		 288 sector_t nr_sectors;
289 sector_t sector = 0;
290 struct blk_zone *zones = NULL;
291 unsigned int i, nreported = 0, nr_zones;
d734492a 292 sector_t zone_sectors;
3c9daa09 293 char *model, *emulated;
5b316468
NA		 294 int ret;
295
3c9daa09
JT		 296 /*
297 * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
298 * yet be set.
299 */
300 if (!btrfs_fs_incompat(fs_info, ZONED))
5b316468
NA		 301 return 0;
302
303 if (device->zone_info)
304 return 0;
305
306 zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
307 if (!zone_info)
308 return -ENOMEM;
309
3c9daa09
JT		 310 if (!bdev_is_zoned(bdev)) {
311 if (!fs_info->zone_size) {
312 ret = calculate_emulated_zone_size(fs_info);
313 if (ret)
314 goto out;
315 }
316
317 ASSERT(fs_info->zone_size);
318 zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
319 } else {
320 zone_sectors = bdev_zone_sectors(bdev);
321 }
322
5b316468
NA		 323 /* Check if it's power of 2 (see is_power_of_2) */
324 ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
325 zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
53b74fa9
NA		 326
327 /* We reject devices with a zone size larger than 8GB */
328 if (zone_info->zone_size > BTRFS_MAX_ZONE_SIZE) {
329 btrfs_err_in_rcu(fs_info,
330 "zoned: %s: zone size %llu larger than supported maximum %llu",
331 rcu_str_deref(device->name),
332 zone_info->zone_size, BTRFS_MAX_ZONE_SIZE);
333 ret = -EINVAL;
334 goto out;
335 }
336
337 nr_sectors = bdev_nr_sectors(bdev);
5b316468 338 zone_info->zone_size_shift = ilog2(zone_info->zone_size);
862931c7
NA		 339 zone_info->max_zone_append_size =
340 (u64)queue_max_zone_append_sectors(queue) << SECTOR_SHIFT;
5b316468
NA		 341 zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
342 if (!IS_ALIGNED(nr_sectors, zone_sectors))
343 zone_info->nr_zones++;
344
1d68128c
JT		 345 if (bdev_is_zoned(bdev) && zone_info->max_zone_append_size == 0) {
346 btrfs_err(fs_info, "zoned: device %pg does not support zone append",
347 bdev);
348 ret = -EINVAL;
349 goto out;
350 }
351
5b316468
NA		 352 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
353 if (!zone_info->seq_zones) {
354 ret = -ENOMEM;
355 goto out;
356 }
357
358 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
359 if (!zone_info->empty_zones) {
360 ret = -ENOMEM;
361 goto out;
362 }
363
364 zones = kcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
365 if (!zones) {
366 ret = -ENOMEM;
367 goto out;
368 }
369
370 /* Get zones type */
371 while (sector < nr_sectors) {
372 nr_zones = BTRFS_REPORT_NR_ZONES;
373 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
374 &nr_zones);
375 if (ret)
376 goto out;
377
378 for (i = 0; i < nr_zones; i++) {
379 if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
380 __set_bit(nreported, zone_info->seq_zones);
381 if (zones[i].cond == BLK_ZONE_COND_EMPTY)
382 __set_bit(nreported, zone_info->empty_zones);
383 nreported++;
384 }
385 sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
386 }
387
388 if (nreported != zone_info->nr_zones) {
389 btrfs_err_in_rcu(device->fs_info,
390 "inconsistent number of zones on %s (%u/%u)",
391 rcu_str_deref(device->name), nreported,
392 zone_info->nr_zones);
393 ret = -EIO;
394 goto out;
395 }
396
12659251
NA		 397 /* Validate superblock log */
398 nr_zones = BTRFS_NR_SB_LOG_ZONES;
399 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
400 u32 sb_zone;
401 u64 sb_wp;
402 int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
403
404 sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
405 if (sb_zone + 1 >= zone_info->nr_zones)
406 continue;
407
408 sector = sb_zone << (zone_info->zone_size_shift - SECTOR_SHIFT);
409 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT,
410 &zone_info->sb_zones[sb_pos],
411 &nr_zones);
412 if (ret)
413 goto out;
414
415 if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
416 btrfs_err_in_rcu(device->fs_info,
417 "zoned: failed to read super block log zone info at devid %llu zone %u",
418 device->devid, sb_zone);
419 ret = -EUCLEAN;
420 goto out;
421 }
422
423 /*
424 * If zones[0] is conventional, always use the beggining of the
425 * zone to record superblock. No need to validate in that case.
426 */
427 if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
428 BLK_ZONE_TYPE_CONVENTIONAL)
429 continue;
430
431 ret = sb_write_pointer(device->bdev,
432 &zone_info->sb_zones[sb_pos], &sb_wp);
433 if (ret != -ENOENT && ret) {
434 btrfs_err_in_rcu(device->fs_info,
435 "zoned: super block log zone corrupted devid %llu zone %u",
436 device->devid, sb_zone);
437 ret = -EUCLEAN;
438 goto out;
439 }
440 }
441
442
5b316468
NA		 443 kfree(zones);
444
445 device->zone_info = zone_info;
446
3c9daa09
JT		 447 switch (bdev_zoned_model(bdev)) {
448 case BLK_ZONED_HM:
449 model = "host-managed zoned";
450 emulated = "";
451 break;
452 case BLK_ZONED_HA:
453 model = "host-aware zoned";
454 emulated = "";
455 break;
456 case BLK_ZONED_NONE:
457 model = "regular";
458 emulated = "emulated ";
459 break;
460 default:
461 /* Just in case */
462 btrfs_err_in_rcu(fs_info, "zoned: unsupported model %d on %s",
463 bdev_zoned_model(bdev),
464 rcu_str_deref(device->name));
465 ret = -EOPNOTSUPP;
466 goto out_free_zone_info;
467 }
468
469 btrfs_info_in_rcu(fs_info,
470 "%s block device %s, %u %szones of %llu bytes",
471 model, rcu_str_deref(device->name), zone_info->nr_zones,
472 emulated, zone_info->zone_size);
5b316468
NA		 473
474 return 0;
475
476out:
477 kfree(zones);
3c9daa09 478out_free_zone_info:
5b316468
NA		 479 bitmap_free(zone_info->empty_zones);
480 bitmap_free(zone_info->seq_zones);
481 kfree(zone_info);
3c9daa09 482 device->zone_info = NULL;
5b316468
NA		 483
484 return ret;
485}
486
487void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
488{
489 struct btrfs_zoned_device_info *zone_info = device->zone_info;
490
491 if (!zone_info)
492 return;
493
494 bitmap_free(zone_info->seq_zones);
495 bitmap_free(zone_info->empty_zones);
496 kfree(zone_info);
497 device->zone_info = NULL;
498}
499
500int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
501 struct blk_zone *zone)
502{
503 unsigned int nr_zones = 1;
504 int ret;
505
506 ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
507 if (ret != 0 || !nr_zones)
508 return ret ? ret : -EIO;
509
510 return 0;
511}
b70f5097
NA		 512
513int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
514{
515 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
516 struct btrfs_device *device;
517 u64 zoned_devices = 0;
518 u64 nr_devices = 0;
519 u64 zone_size = 0;
862931c7 520 u64 max_zone_append_size = 0;
3c9daa09 521 const bool incompat_zoned = btrfs_fs_incompat(fs_info, ZONED);
b70f5097
NA		 522 int ret = 0;
523
524 /* Count zoned devices */
525 list_for_each_entry(device, &fs_devices->devices, dev_list) {
526 enum blk_zoned_model model;
527
528 if (!device->bdev)
529 continue;
530
531 model = bdev_zoned_model(device->bdev);
3c9daa09
JT		 532 /*
533 * A Host-Managed zoned device must be used as a zoned device.
534 * A Host-Aware zoned device and a non-zoned devices can be
535 * treated as a zoned device, if ZONED flag is enabled in the
536 * superblock.
537 */
b70f5097 538 if (model == BLK_ZONED_HM ||
3c9daa09
JT		 539 (model == BLK_ZONED_HA && incompat_zoned) ||
540 (model == BLK_ZONED_NONE && incompat_zoned)) {
541 struct btrfs_zoned_device_info *zone_info =
542 device->zone_info;
862931c7
NA		 543
544 zone_info = device->zone_info;
b70f5097
NA		 545 zoned_devices++;
546 if (!zone_size) {
862931c7
NA		 547 zone_size = zone_info->zone_size;
548 } else if (zone_info->zone_size != zone_size) {
b70f5097
NA		 549 btrfs_err(fs_info,
550 "zoned: unequal block device zone sizes: have %llu found %llu",
551 device->zone_info->zone_size,
552 zone_size);
553 ret = -EINVAL;
554 goto out;
555 }
862931c7
NA		 556 if (!max_zone_append_size ||
557 (zone_info->max_zone_append_size &&
558 zone_info->max_zone_append_size < max_zone_append_size))
559 max_zone_append_size =
560 zone_info->max_zone_append_size;
b70f5097
NA		 561 }
562 nr_devices++;
563 }
564
565 if (!zoned_devices && !incompat_zoned)
566 goto out;
567
568 if (!zoned_devices && incompat_zoned) {
569 /* No zoned block device found on ZONED filesystem */
570 btrfs_err(fs_info,
571 "zoned: no zoned devices found on a zoned filesystem");
572 ret = -EINVAL;
573 goto out;
574 }
575
576 if (zoned_devices && !incompat_zoned) {
577 btrfs_err(fs_info,
578 "zoned: mode not enabled but zoned device found");
579 ret = -EINVAL;
580 goto out;
581 }
582
583 if (zoned_devices != nr_devices) {
584 btrfs_err(fs_info,
585 "zoned: cannot mix zoned and regular devices");
586 ret = -EINVAL;
587 goto out;
588 }
589
590 /*
591 * stripe_size is always aligned to BTRFS_STRIPE_LEN in
592 * __btrfs_alloc_chunk(). Since we want stripe_len == zone_size,
593 * check the alignment here.
594 */
595 if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
596 btrfs_err(fs_info,
597 "zoned: zone size %llu not aligned to stripe %u",
598 zone_size, BTRFS_STRIPE_LEN);
599 ret = -EINVAL;
600 goto out;
601 }
602
a589dde0
NA		 603 if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
604 btrfs_err(fs_info, "zoned: mixed block groups not supported");
605 ret = -EINVAL;
606 goto out;
607 }
608
b70f5097 609 fs_info->zone_size = zone_size;
862931c7 610 fs_info->max_zone_append_size = max_zone_append_size;
1cd6121f 611 fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
b70f5097 612
b53429ba
JT		 613 /*
614 * Check mount options here, because we might change fs_info->zoned
615 * from fs_info->zone_size.
616 */
617 ret = btrfs_check_mountopts_zoned(fs_info);
618 if (ret)
619 goto out;
620
b70f5097
NA		 621 btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
622out:
623 return ret;
624}
5d1ab66c
NA		 625
626int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
627{
628 if (!btrfs_is_zoned(info))
629 return 0;
630
631 /*
632 * Space cache writing is not COWed. Disable that to avoid write errors
633 * in sequential zones.
634 */
635 if (btrfs_test_opt(info, SPACE_CACHE)) {
636 btrfs_err(info, "zoned: space cache v1 is not supported");
637 return -EINVAL;
638 }
639
d206e9c9
NA		 640 if (btrfs_test_opt(info, NODATACOW)) {
641 btrfs_err(info, "zoned: NODATACOW not supported");
642 return -EINVAL;
643 }
644
5d1ab66c
NA		 645 return 0;
646}
12659251
NA		 647
648static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
649 int rw, u64 *bytenr_ret)
650{
651 u64 wp;
652 int ret;
653
654 if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {
655 *bytenr_ret = zones[0].start << SECTOR_SHIFT;
656 return 0;
657 }
658
659 ret = sb_write_pointer(bdev, zones, &wp);
660 if (ret != -ENOENT && ret < 0)
661 return ret;
662
663 if (rw == WRITE) {
664 struct blk_zone *reset = NULL;
665
666 if (wp == zones[0].start << SECTOR_SHIFT)
667 reset = &zones[0];
668 else if (wp == zones[1].start << SECTOR_SHIFT)
669 reset = &zones[1];
670
671 if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {
672 ASSERT(reset->cond == BLK_ZONE_COND_FULL);
673
674 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
675 reset->start, reset->len,
676 GFP_NOFS);
677 if (ret)
678 return ret;
679
680 reset->cond = BLK_ZONE_COND_EMPTY;
681 reset->wp = reset->start;
682 }
683 } else if (ret != -ENOENT) {
684 /* For READ, we want the precious one */
685 if (wp == zones[0].start << SECTOR_SHIFT)
686 wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT;
687 wp -= BTRFS_SUPER_INFO_SIZE;
688 }
689
690 *bytenr_ret = wp;
691 return 0;
692
693}
694
695int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
696 u64 *bytenr_ret)
697{
698 struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];
d734492a 699 sector_t zone_sectors;
12659251
NA		 700 u32 sb_zone;
701 int ret;
12659251
NA		 702 u8 zone_sectors_shift;
703 sector_t nr_sectors;
704 u32 nr_zones;
705
706 if (!bdev_is_zoned(bdev)) {
707 *bytenr_ret = btrfs_sb_offset(mirror);
708 return 0;
709 }
710
711 ASSERT(rw == READ || rw == WRITE);
712
713 zone_sectors = bdev_zone_sectors(bdev);
714 if (!is_power_of_2(zone_sectors))
715 return -EINVAL;
12659251 716 zone_sectors_shift = ilog2(zone_sectors);
ac7ac461 717 nr_sectors = bdev_nr_sectors(bdev);
12659251
NA		 718 nr_zones = nr_sectors >> zone_sectors_shift;
719
720 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
721 if (sb_zone + 1 >= nr_zones)
722 return -ENOENT;
723
724 ret = blkdev_report_zones(bdev, sb_zone << zone_sectors_shift,
725 BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,
726 zones);
727 if (ret < 0)
728 return ret;
729 if (ret != BTRFS_NR_SB_LOG_ZONES)
730 return -EIO;
731
732 return sb_log_location(bdev, zones, rw, bytenr_ret);
733}
734
735int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
736 u64 *bytenr_ret)
737{
738 struct btrfs_zoned_device_info *zinfo = device->zone_info;
739 u32 zone_num;
740
d6639b35
NA		 741 /*
742 * For a zoned filesystem on a non-zoned block device, use the same
743 * super block locations as regular filesystem. Doing so, the super
744 * block can always be retrieved and the zoned flag of the volume
745 * detected from the super block information.
746 */
747 if (!bdev_is_zoned(device->bdev)) {
12659251
NA		 748 *bytenr_ret = btrfs_sb_offset(mirror);
749 return 0;
750 }
751
752 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
753 if (zone_num + 1 >= zinfo->nr_zones)
754 return -ENOENT;
755
756 return sb_log_location(device->bdev,
757 &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],
758 rw, bytenr_ret);
759}
760
761static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,
762 int mirror)
763{
764 u32 zone_num;
765
766 if (!zinfo)
767 return false;
768
769 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
770 if (zone_num + 1 >= zinfo->nr_zones)
771 return false;
772
773 if (!test_bit(zone_num, zinfo->seq_zones))
774 return false;
775
776 return true;
777}
778
779void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
780{
781 struct btrfs_zoned_device_info *zinfo = device->zone_info;
782 struct blk_zone *zone;
783
784 if (!is_sb_log_zone(zinfo, mirror))
785 return;
786
787 zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];
788 if (zone->cond != BLK_ZONE_COND_FULL) {
789 if (zone->cond == BLK_ZONE_COND_EMPTY)
790 zone->cond = BLK_ZONE_COND_IMP_OPEN;
791
792 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
793
794 if (zone->wp == zone->start + zone->len)
795 zone->cond = BLK_ZONE_COND_FULL;
796
797 return;
798 }
799
800 zone++;
801 ASSERT(zone->cond != BLK_ZONE_COND_FULL);
802 if (zone->cond == BLK_ZONE_COND_EMPTY)
803 zone->cond = BLK_ZONE_COND_IMP_OPEN;
804
805 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
806
807 if (zone->wp == zone->start + zone->len)
808 zone->cond = BLK_ZONE_COND_FULL;
809}
810
811int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
812{
813 sector_t zone_sectors;
814 sector_t nr_sectors;
815 u8 zone_sectors_shift;
816 u32 sb_zone;
817 u32 nr_zones;
818
819 zone_sectors = bdev_zone_sectors(bdev);
820 zone_sectors_shift = ilog2(zone_sectors);
ac7ac461 821 nr_sectors = bdev_nr_sectors(bdev);
12659251
NA		 822 nr_zones = nr_sectors >> zone_sectors_shift;
823
824 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
825 if (sb_zone + 1 >= nr_zones)
826 return -ENOENT;
827
828 return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
829 sb_zone << zone_sectors_shift,
830 zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
831}
1cd6121f
NA		 832
833/**
834 * btrfs_find_allocatable_zones - find allocatable zones within a given region
835 *
836 * @device: the device to allocate a region on
837 * @hole_start: the position of the hole to allocate the region
838 * @num_bytes: size of wanted region
839 * @hole_end: the end of the hole
840 * @return: position of allocatable zones
841 *
842 * Allocatable region should not contain any superblock locations.
843 */
844u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
845 u64 hole_end, u64 num_bytes)
846{
847 struct btrfs_zoned_device_info *zinfo = device->zone_info;
848 const u8 shift = zinfo->zone_size_shift;
849 u64 nzones = num_bytes >> shift;
850 u64 pos = hole_start;
851 u64 begin, end;
852 bool have_sb;
853 int i;
854
855 ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
856 ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
857
858 while (pos < hole_end) {
859 begin = pos >> shift;
860 end = begin + nzones;
861
862 if (end > zinfo->nr_zones)
863 return hole_end;
864
865 /* Check if zones in the region are all empty */
866 if (btrfs_dev_is_sequential(device, pos) &&
867 find_next_zero_bit(zinfo->empty_zones, end, begin) != end) {
868 pos += zinfo->zone_size;
869 continue;
870 }
871
872 have_sb = false;
873 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
874 u32 sb_zone;
875 u64 sb_pos;
876
877 sb_zone = sb_zone_number(shift, i);
878 if (!(end <= sb_zone ||
879 sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
880 have_sb = true;
881 pos = ((u64)sb_zone + BTRFS_NR_SB_LOG_ZONES) << shift;
882 break;
883 }
884
885 /* We also need to exclude regular superblock positions */
886 sb_pos = btrfs_sb_offset(i);
887 if (!(pos + num_bytes <= sb_pos ||
888 sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
889 have_sb = true;
890 pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
891 zinfo->zone_size);
892 break;
893 }
894 }
895 if (!have_sb)
896 break;
897 }
898
899 return pos;
900}
901
902int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
903 u64 length, u64 *bytes)
904{
905 int ret;
906
907 *bytes = 0;
908 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
909 physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT,
910 GFP_NOFS);
911 if (ret)
912 return ret;
913
914 *bytes = length;
915 while (length) {
916 btrfs_dev_set_zone_empty(device, physical);
917 physical += device->zone_info->zone_size;
918 length -= device->zone_info->zone_size;
919 }
920
921 return 0;
922}
923
924int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
925{
926 struct btrfs_zoned_device_info *zinfo = device->zone_info;
927 const u8 shift = zinfo->zone_size_shift;
928 unsigned long begin = start >> shift;
929 unsigned long end = (start + size) >> shift;
930 u64 pos;
931 int ret;
932
933 ASSERT(IS_ALIGNED(start, zinfo->zone_size));
934 ASSERT(IS_ALIGNED(size, zinfo->zone_size));
935
936 if (end > zinfo->nr_zones)
937 return -ERANGE;
938
939 /* All the zones are conventional */
940 if (find_next_bit(zinfo->seq_zones, begin, end) == end)
941 return 0;
942
943 /* All the zones are sequential and empty */
944 if (find_next_zero_bit(zinfo->seq_zones, begin, end) == end &&
945 find_next_zero_bit(zinfo->empty_zones, begin, end) == end)
946 return 0;
947
948 for (pos = start; pos < start + size; pos += zinfo->zone_size) {
949 u64 reset_bytes;
950
951 if (!btrfs_dev_is_sequential(device, pos) ||
952 btrfs_dev_is_empty_zone(device, pos))
953 continue;
954
955 /* Free regions should be empty */
956 btrfs_warn_in_rcu(
957 device->fs_info,
958 "zoned: resetting device %s (devid %llu) zone %llu for allocation",
959 rcu_str_deref(device->name), device->devid, pos >> shift);
960 WARN_ON_ONCE(1);
961
962 ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
963 &reset_bytes);
964 if (ret)
965 return ret;
966 }
967
968 return 0;
969}
08e11a3d 970
a94794d5
NA		 971/*
972 * Calculate an allocation pointer from the extent allocation information
973 * for a block group consist of conventional zones. It is pointed to the
974 * end of the highest addressed extent in the block group as an allocation
975 * offset.
976 */
977static int calculate_alloc_pointer(struct btrfs_block_group *cache,
978 u64 *offset_ret)
979{
980 struct btrfs_fs_info *fs_info = cache->fs_info;
981 struct btrfs_root *root = fs_info->extent_root;
982 struct btrfs_path *path;
983 struct btrfs_key key;
984 struct btrfs_key found_key;
985 int ret;
986 u64 length;
987
988 path = btrfs_alloc_path();
989 if (!path)
990 return -ENOMEM;
991
992 key.objectid = cache->start + cache->length;
993 key.type = 0;
994 key.offset = 0;
995
996 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
997 /* We should not find the exact match */
998 if (!ret)
999 ret = -EUCLEAN;
1000 if (ret < 0)
1001 goto out;
1002
1003 ret = btrfs_previous_extent_item(root, path, cache->start);
1004 if (ret) {
1005 if (ret == 1) {
1006 ret = 0;
1007 *offset_ret = 0;
1008 }
1009 goto out;
1010 }
1011
1012 btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
1013
1014 if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
1015 length = found_key.offset;
1016 else
1017 length = fs_info->nodesize;
1018
1019 if (!(found_key.objectid >= cache->start &&
1020 found_key.objectid + length <= cache->start + cache->length)) {
1021 ret = -EUCLEAN;
1022 goto out;
1023 }
1024 *offset_ret = found_key.objectid + length - cache->start;
1025 ret = 0;
1026
1027out:
1028 btrfs_free_path(path);
1029 return ret;
1030}
1031
1032int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
08e11a3d
NA		 1033{
1034 struct btrfs_fs_info *fs_info = cache->fs_info;
1035 struct extent_map_tree *em_tree = &fs_info->mapping_tree;
1036 struct extent_map *em;
1037 struct map_lookup *map;
1038 struct btrfs_device *device;
1039 u64 logical = cache->start;
1040 u64 length = cache->length;
1041 u64 physical = 0;
1042 int ret;
1043 int i;
1044 unsigned int nofs_flag;
1045 u64 *alloc_offsets = NULL;
a94794d5 1046 u64 last_alloc = 0;
08e11a3d
NA		 1047 u32 num_sequential = 0, num_conventional = 0;
1048
1049 if (!btrfs_is_zoned(fs_info))
1050 return 0;
1051
1052 /* Sanity check */
1053 if (!IS_ALIGNED(length, fs_info->zone_size)) {
1054 btrfs_err(fs_info,
1055 "zoned: block group %llu len %llu unaligned to zone size %llu",
1056 logical, length, fs_info->zone_size);
1057 return -EIO;
1058 }
1059
1060 /* Get the chunk mapping */
1061 read_lock(&em_tree->lock);
1062 em = lookup_extent_mapping(em_tree, logical, length);
1063 read_unlock(&em_tree->lock);
1064
1065 if (!em)
1066 return -EINVAL;
1067
1068 map = em->map_lookup;
1069
1070 alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS);
1071 if (!alloc_offsets) {
1072 free_extent_map(em);
1073 return -ENOMEM;
1074 }
1075
1076 for (i = 0; i < map->num_stripes; i++) {
1077 bool is_sequential;
1078 struct blk_zone zone;
6143c23c
NA		 1079 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
1080 int dev_replace_is_ongoing = 0;
08e11a3d
NA		 1081
1082 device = map->stripes[i].dev;
1083 physical = map->stripes[i].physical;
1084
1085 if (device->bdev == NULL) {
1086 alloc_offsets[i] = WP_MISSING_DEV;
1087 continue;
1088 }
1089
1090 is_sequential = btrfs_dev_is_sequential(device, physical);
1091 if (is_sequential)
1092 num_sequential++;
1093 else
1094 num_conventional++;
1095
1096 if (!is_sequential) {
1097 alloc_offsets[i] = WP_CONVENTIONAL;
1098 continue;
1099 }
1100
1101 /*
1102 * This zone will be used for allocation, so mark this zone
1103 * non-empty.
1104 */
1105 btrfs_dev_clear_zone_empty(device, physical);
1106
6143c23c
NA		 1107 down_read(&dev_replace->rwsem);
1108 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
1109 if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
1110 btrfs_dev_clear_zone_empty(dev_replace->tgtdev, physical);
1111 up_read(&dev_replace->rwsem);
1112
08e11a3d
NA		 1113 /*
1114 * The group is mapped to a sequential zone. Get the zone write
1115 * pointer to determine the allocation offset within the zone.
1116 */
1117 WARN_ON(!IS_ALIGNED(physical, fs_info->zone_size));
1118 nofs_flag = memalloc_nofs_save();
1119 ret = btrfs_get_dev_zone(device, physical, &zone);
1120 memalloc_nofs_restore(nofs_flag);
1121 if (ret == -EIO || ret == -EOPNOTSUPP) {
1122 ret = 0;
1123 alloc_offsets[i] = WP_MISSING_DEV;
1124 continue;
1125 } else if (ret) {
1126 goto out;
1127 }
1128
784daf2b
NA		 1129 if (zone.type == BLK_ZONE_TYPE_CONVENTIONAL) {
1130 ret = -EIO;
1131 goto out;
1132 }
1133
08e11a3d
NA		 1134 switch (zone.cond) {
1135 case BLK_ZONE_COND_OFFLINE:
1136 case BLK_ZONE_COND_READONLY:
1137 btrfs_err(fs_info,
1138 "zoned: offline/readonly zone %llu on device %s (devid %llu)",
1139 physical >> device->zone_info->zone_size_shift,
1140 rcu_str_deref(device->name), device->devid);
1141 alloc_offsets[i] = WP_MISSING_DEV;
1142 break;
1143 case BLK_ZONE_COND_EMPTY:
1144 alloc_offsets[i] = 0;
1145 break;
1146 case BLK_ZONE_COND_FULL:
1147 alloc_offsets[i] = fs_info->zone_size;
1148 break;
1149 default:
1150 /* Partially used zone */
1151 alloc_offsets[i] =
1152 ((zone.wp - zone.start) << SECTOR_SHIFT);
1153 break;
1154 }
1155 }
1156
08f45559
JT		 1157 if (num_sequential > 0)
1158 cache->seq_zone = true;
1159
08e11a3d
NA		 1160 if (num_conventional > 0) {
1161 /*
a94794d5
NA		 1162 * Avoid calling calculate_alloc_pointer() for new BG. It
1163 * is no use for new BG. It must be always 0.
1164 *
1165 * Also, we have a lock chain of extent buffer lock ->
1166 * chunk mutex. For new BG, this function is called from
1167 * btrfs_make_block_group() which is already taking the
1168 * chunk mutex. Thus, we cannot call
1169 * calculate_alloc_pointer() which takes extent buffer
1170 * locks to avoid deadlock.
08e11a3d 1171 */
a94794d5
NA		 1172 if (new) {
1173 cache->alloc_offset = 0;
1174 goto out;
1175 }
1176 ret = calculate_alloc_pointer(cache, &last_alloc);
1177 if (ret || map->num_stripes == num_conventional) {
1178 if (!ret)
1179 cache->alloc_offset = last_alloc;
1180 else
1181 btrfs_err(fs_info,
1182 "zoned: failed to determine allocation offset of bg %llu",
1183 cache->start);
1184 goto out;
1185 }
08e11a3d
NA		 1186 }
1187
1188 switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1189 case 0: /* single */
1190 cache->alloc_offset = alloc_offsets[0];
1191 break;
1192 case BTRFS_BLOCK_GROUP_DUP:
1193 case BTRFS_BLOCK_GROUP_RAID1:
1194 case BTRFS_BLOCK_GROUP_RAID0:
1195 case BTRFS_BLOCK_GROUP_RAID10:
1196 case BTRFS_BLOCK_GROUP_RAID5:
1197 case BTRFS_BLOCK_GROUP_RAID6:
1198 /* non-single profiles are not supported yet */
1199 default:
1200 btrfs_err(fs_info, "zoned: profile %s not yet supported",
1201 btrfs_bg_type_to_raid_name(map->type));
1202 ret = -EINVAL;
1203 goto out;
1204 }
1205
1206out:
a94794d5
NA		 1207 /* An extent is allocated after the write pointer */
1208 if (!ret && num_conventional && last_alloc > cache->alloc_offset) {
1209 btrfs_err(fs_info,
1210 "zoned: got wrong write pointer in BG %llu: %llu > %llu",
1211 logical, last_alloc, cache->alloc_offset);
1212 ret = -EIO;
1213 }
1214
0bc09ca1
NA		 1215 if (!ret)
1216 cache->meta_write_pointer = cache->alloc_offset + cache->start;
1217
08e11a3d
NA		 1218 kfree(alloc_offsets);
1219 free_extent_map(em);
1220
1221 return ret;
1222}
169e0da9
NA		 1223
1224void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)
1225{
1226 u64 unusable, free;
1227
1228 if (!btrfs_is_zoned(cache->fs_info))
1229 return;
1230
1231 WARN_ON(cache->bytes_super != 0);
1232 unusable = cache->alloc_offset - cache->used;
1233 free = cache->length - cache->alloc_offset;
1234
1235 /* We only need ->free_space in ALLOC_SEQ block groups */
1236 cache->last_byte_to_unpin = (u64)-1;
1237 cache->cached = BTRFS_CACHE_FINISHED;
1238 cache->free_space_ctl->free_space = free;
1239 cache->zone_unusable = unusable;
1240
1241 /* Should not have any excluded extents. Just in case, though */
1242 btrfs_free_excluded_extents(cache);
1243}
d3575156
NA		 1244
1245void btrfs_redirty_list_add(struct btrfs_transaction *trans,
1246 struct extent_buffer *eb)
1247{
1248 struct btrfs_fs_info *fs_info = eb->fs_info;
1249
1250 if (!btrfs_is_zoned(fs_info) ||
1251 btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN) ||
1252 !list_empty(&eb->release_list))
1253 return;
1254
1255 set_extent_buffer_dirty(eb);
1256 set_extent_bits_nowait(&trans->dirty_pages, eb->start,
1257 eb->start + eb->len - 1, EXTENT_DIRTY);
1258 memzero_extent_buffer(eb, 0, eb->len);
1259 set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
1260
1261 spin_lock(&trans->releasing_ebs_lock);
1262 list_add_tail(&eb->release_list, &trans->releasing_ebs);
1263 spin_unlock(&trans->releasing_ebs_lock);
1264 atomic_inc(&eb->refs);
1265}
1266
1267void btrfs_free_redirty_list(struct btrfs_transaction *trans)
1268{
1269 spin_lock(&trans->releasing_ebs_lock);
1270 while (!list_empty(&trans->releasing_ebs)) {
1271 struct extent_buffer *eb;
1272
1273 eb = list_first_entry(&trans->releasing_ebs,
1274 struct extent_buffer, release_list);
1275 list_del_init(&eb->release_list);
1276 free_extent_buffer(eb);
1277 }
1278 spin_unlock(&trans->releasing_ebs_lock);
1279}
08f45559 1280
e380adfc 1281bool btrfs_use_zone_append(struct btrfs_inode *inode, u64 start)
08f45559
JT		 1282{
1283 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1284 struct btrfs_block_group *cache;
1285 bool ret = false;
1286
1287 if (!btrfs_is_zoned(fs_info))
1288 return false;
1289
1290 if (!fs_info->max_zone_append_size)
1291 return false;
1292
1293 if (!is_data_inode(&inode->vfs_inode))
1294 return false;
1295
e380adfc 1296 cache = btrfs_lookup_block_group(fs_info, start);
08f45559
JT		 1297 ASSERT(cache);
1298 if (!cache)
1299 return false;
1300
1301 ret = cache->seq_zone;
1302 btrfs_put_block_group(cache);
1303
1304 return ret;
1305}
d8e3fb10
NA		 1306
1307void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
1308 struct bio *bio)
1309{
1310 struct btrfs_ordered_extent *ordered;
1311 const u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
1312
1313 if (bio_op(bio) != REQ_OP_ZONE_APPEND)
1314 return;
1315
1316 ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), file_offset);
1317 if (WARN_ON(!ordered))
1318 return;
1319
1320 ordered->physical = physical;
582cd91f
LT		 1321 ordered->disk = bio->bi_bdev->bd_disk;
1322 ordered->partno = bio->bi_bdev->bd_partno;
d8e3fb10
NA		 1323
1324 btrfs_put_ordered_extent(ordered);
1325}
1326
1327void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered)
1328{
1329 struct btrfs_inode *inode = BTRFS_I(ordered->inode);
1330 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1331 struct extent_map_tree *em_tree;
1332 struct extent_map *em;
1333 struct btrfs_ordered_sum *sum;
1334 struct block_device *bdev;
1335 u64 orig_logical = ordered->disk_bytenr;
1336 u64 *logical = NULL;
1337 int nr, stripe_len;
1338
1339 /* Zoned devices should not have partitions. So, we can assume it is 0 */
1340 ASSERT(ordered->partno == 0);
1341 bdev = bdgrab(ordered->disk->part0);
1342 if (WARN_ON(!bdev))
1343 return;
1344
1345 if (WARN_ON(btrfs_rmap_block(fs_info, orig_logical, bdev,
1346 ordered->physical, &logical, &nr,
1347 &stripe_len)))
1348 goto out;
1349
1350 WARN_ON(nr != 1);
1351
1352 if (orig_logical == *logical)
1353 goto out;
1354
1355 ordered->disk_bytenr = *logical;
1356
1357 em_tree = &inode->extent_tree;
1358 write_lock(&em_tree->lock);
1359 em = search_extent_mapping(em_tree, ordered->file_offset,
1360 ordered->num_bytes);
1361 em->block_start = *logical;
1362 free_extent_map(em);
1363 write_unlock(&em_tree->lock);
1364
1365 list_for_each_entry(sum, &ordered->list, list) {
1366 if (*logical < orig_logical)
1367 sum->bytenr -= orig_logical - *logical;
1368 else
1369 sum->bytenr += *logical - orig_logical;
1370 }
1371
1372out:
1373 kfree(logical);
1374 bdput(bdev);
1375}
0bc09ca1
NA		 1376
1377bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
1378 struct extent_buffer *eb,
1379 struct btrfs_block_group **cache_ret)
1380{
1381 struct btrfs_block_group *cache;
1382 bool ret = true;
1383
1384 if (!btrfs_is_zoned(fs_info))
1385 return true;
1386
1387 cache = *cache_ret;
1388
1389 if (cache && (eb->start < cache->start ||
1390 cache->start + cache->length <= eb->start)) {
1391 btrfs_put_block_group(cache);
1392 cache = NULL;
1393 *cache_ret = NULL;
1394 }
1395
1396 if (!cache)
1397 cache = btrfs_lookup_block_group(fs_info, eb->start);
1398
1399 if (cache) {
1400 if (cache->meta_write_pointer != eb->start) {
1401 btrfs_put_block_group(cache);
1402 cache = NULL;
1403 ret = false;
1404 } else {
1405 cache->meta_write_pointer = eb->start + eb->len;
1406 }
1407
1408 *cache_ret = cache;
1409 }
1410
1411 return ret;
1412}
1413
1414void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
1415 struct extent_buffer *eb)
1416{
1417 if (!btrfs_is_zoned(eb->fs_info) || !cache)
1418 return;
1419
1420 ASSERT(cache->meta_write_pointer == eb->start + eb->len);
1421 cache->meta_write_pointer = eb->start;
1422}
de17addc
NA		 1423
1424int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
1425{
1426 if (!btrfs_dev_is_sequential(device, physical))
1427 return -EOPNOTSUPP;
1428
1429 return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
1430 length >> SECTOR_SHIFT, GFP_NOFS, 0);
1431}
7db1c5d1
NA		 1432
1433static int read_zone_info(struct btrfs_fs_info *fs_info, u64 logical,
1434 struct blk_zone *zone)
1435{
1436 struct btrfs_bio *bbio = NULL;
1437 u64 mapped_length = PAGE_SIZE;
1438 unsigned int nofs_flag;
1439 int nmirrors;
1440 int i, ret;
1441
1442 ret = btrfs_map_sblock(fs_info, BTRFS_MAP_GET_READ_MIRRORS, logical,
1443 &mapped_length, &bbio);
1444 if (ret || !bbio || mapped_length < PAGE_SIZE) {
1445 btrfs_put_bbio(bbio);
1446 return -EIO;
1447 }
1448
1449 if (bbio->map_type & BTRFS_BLOCK_GROUP_RAID56_MASK)
1450 return -EINVAL;
1451
1452 nofs_flag = memalloc_nofs_save();
1453 nmirrors = (int)bbio->num_stripes;
1454 for (i = 0; i < nmirrors; i++) {
1455 u64 physical = bbio->stripes[i].physical;
1456 struct btrfs_device *dev = bbio->stripes[i].dev;
1457
1458 /* Missing device */
1459 if (!dev->bdev)
1460 continue;
1461
1462 ret = btrfs_get_dev_zone(dev, physical, zone);
1463 /* Failing device */
1464 if (ret == -EIO || ret == -EOPNOTSUPP)
1465 continue;
1466 break;
1467 }
1468 memalloc_nofs_restore(nofs_flag);
1469
1470 return ret;
1471}
1472
1473/*
1474 * Synchronize write pointer in a zone at @physical_start on @tgt_dev, by
1475 * filling zeros between @physical_pos to a write pointer of dev-replace
1476 * source device.
1477 */
1478int btrfs_sync_zone_write_pointer(struct btrfs_device *tgt_dev, u64 logical,
1479 u64 physical_start, u64 physical_pos)
1480{
1481 struct btrfs_fs_info *fs_info = tgt_dev->fs_info;
1482 struct blk_zone zone;
1483 u64 length;
1484 u64 wp;
1485 int ret;
1486
1487 if (!btrfs_dev_is_sequential(tgt_dev, physical_pos))
1488 return 0;
1489
1490 ret = read_zone_info(fs_info, logical, &zone);
1491 if (ret)
1492 return ret;
1493
1494 wp = physical_start + ((zone.wp - zone.start) << SECTOR_SHIFT);
1495
1496 if (physical_pos == wp)
1497 return 0;
1498
1499 if (physical_pos > wp)
1500 return -EUCLEAN;
1501
1502 length = wp - physical_pos;
1503 return btrfs_zoned_issue_zeroout(tgt_dev, physical_pos, length);
1504}
Linux 6.x block layer and io_uring tree(s)