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btrfs: zoned: implement copying for zoned device-replace
[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"
5b316468
NA		 15
16/* Maximum number of zones to report per blkdev_report_zones() call */
17#define BTRFS_REPORT_NR_ZONES 4096
08e11a3d
NA		 18/* Invalid allocation pointer value for missing devices */
19#define WP_MISSING_DEV ((u64)-1)
20/* Pseudo write pointer value for conventional zone */
21#define WP_CONVENTIONAL ((u64)-2)
5b316468 22
12659251
NA		 23/* Number of superblock log zones */
24#define BTRFS_NR_SB_LOG_ZONES 2
25
5b316468
NA		 26static int copy_zone_info_cb(struct blk_zone *zone, unsigned int idx, void *data)
27{
28 struct blk_zone *zones = data;
29
30 memcpy(&zones[idx], zone, sizeof(*zone));
31
32 return 0;
33}
34
12659251
NA		 35static int sb_write_pointer(struct block_device *bdev, struct blk_zone *zones,
36 u64 *wp_ret)
37{
38 bool empty[BTRFS_NR_SB_LOG_ZONES];
39 bool full[BTRFS_NR_SB_LOG_ZONES];
40 sector_t sector;
41
42 ASSERT(zones[0].type != BLK_ZONE_TYPE_CONVENTIONAL &&
43 zones[1].type != BLK_ZONE_TYPE_CONVENTIONAL);
44
45 empty[0] = (zones[0].cond == BLK_ZONE_COND_EMPTY);
46 empty[1] = (zones[1].cond == BLK_ZONE_COND_EMPTY);
47 full[0] = (zones[0].cond == BLK_ZONE_COND_FULL);
48 full[1] = (zones[1].cond == BLK_ZONE_COND_FULL);
49
50 /*
51 * Possible states of log buffer zones
52 *
53 * Empty[0] In use[0] Full[0]
54 * Empty[1] * x 0
55 * In use[1] 0 x 0
56 * Full[1] 1 1 C
57 *
58 * Log position:
59 * *: Special case, no superblock is written
60 * 0: Use write pointer of zones[0]
61 * 1: Use write pointer of zones[1]
62 * C: Compare super blcoks from zones[0] and zones[1], use the latest
63 * one determined by generation
64 * x: Invalid state
65 */
66
67 if (empty[0] && empty[1]) {
68 /* Special case to distinguish no superblock to read */
69 *wp_ret = zones[0].start << SECTOR_SHIFT;
70 return -ENOENT;
71 } else if (full[0] && full[1]) {
72 /* Compare two super blocks */
73 struct address_space *mapping = bdev->bd_inode->i_mapping;
74 struct page *page[BTRFS_NR_SB_LOG_ZONES];
75 struct btrfs_super_block *super[BTRFS_NR_SB_LOG_ZONES];
76 int i;
77
78 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++) {
79 u64 bytenr;
80
81 bytenr = ((zones[i].start + zones[i].len)
82 << SECTOR_SHIFT) - BTRFS_SUPER_INFO_SIZE;
83
84 page[i] = read_cache_page_gfp(mapping,
85 bytenr >> PAGE_SHIFT, GFP_NOFS);
86 if (IS_ERR(page[i])) {
87 if (i == 1)
88 btrfs_release_disk_super(super[0]);
89 return PTR_ERR(page[i]);
90 }
91 super[i] = page_address(page[i]);
92 }
93
94 if (super[0]->generation > super[1]->generation)
95 sector = zones[1].start;
96 else
97 sector = zones[0].start;
98
99 for (i = 0; i < BTRFS_NR_SB_LOG_ZONES; i++)
100 btrfs_release_disk_super(super[i]);
101 } else if (!full[0] && (empty[1] || full[1])) {
102 sector = zones[0].wp;
103 } else if (full[0]) {
104 sector = zones[1].wp;
105 } else {
106 return -EUCLEAN;
107 }
108 *wp_ret = sector << SECTOR_SHIFT;
109 return 0;
110}
111
112/*
113 * The following zones are reserved as the circular buffer on ZONED btrfs.
114 * - The primary superblock: zones 0 and 1
115 * - The first copy: zones 16 and 17
116 * - The second copy: zones 1024 or zone at 256GB which is minimum, and
117 * the following one
118 */
119static inline u32 sb_zone_number(int shift, int mirror)
120{
121 ASSERT(mirror < BTRFS_SUPER_MIRROR_MAX);
122
123 switch (mirror) {
124 case 0: return 0;
125 case 1: return 16;
126 case 2: return min_t(u64, btrfs_sb_offset(mirror) >> shift, 1024);
127 }
128
129 return 0;
130}
131
3c9daa09
JT		 132/*
133 * Emulate blkdev_report_zones() for a non-zoned device. It slices up the block
134 * device into static sized chunks and fake a conventional zone on each of
135 * them.
136 */
137static int emulate_report_zones(struct btrfs_device *device, u64 pos,
138 struct blk_zone *zones, unsigned int nr_zones)
139{
140 const sector_t zone_sectors = device->fs_info->zone_size >> SECTOR_SHIFT;
141 sector_t bdev_size = bdev_nr_sectors(device->bdev);
142 unsigned int i;
143
144 pos >>= SECTOR_SHIFT;
145 for (i = 0; i < nr_zones; i++) {
146 zones[i].start = i * zone_sectors + pos;
147 zones[i].len = zone_sectors;
148 zones[i].capacity = zone_sectors;
149 zones[i].wp = zones[i].start + zone_sectors;
150 zones[i].type = BLK_ZONE_TYPE_CONVENTIONAL;
151 zones[i].cond = BLK_ZONE_COND_NOT_WP;
152
153 if (zones[i].wp >= bdev_size) {
154 i++;
155 break;
156 }
157 }
158
159 return i;
160}
161
5b316468
NA		 162static int btrfs_get_dev_zones(struct btrfs_device *device, u64 pos,
163 struct blk_zone *zones, unsigned int *nr_zones)
164{
165 int ret;
166
167 if (!*nr_zones)
168 return 0;
169
3c9daa09
JT		 170 if (!bdev_is_zoned(device->bdev)) {
171 ret = emulate_report_zones(device, pos, zones, *nr_zones);
172 *nr_zones = ret;
173 return 0;
174 }
175
5b316468
NA		 176 ret = blkdev_report_zones(device->bdev, pos >> SECTOR_SHIFT, *nr_zones,
177 copy_zone_info_cb, zones);
178 if (ret < 0) {
179 btrfs_err_in_rcu(device->fs_info,
180 "zoned: failed to read zone %llu on %s (devid %llu)",
181 pos, rcu_str_deref(device->name),
182 device->devid);
183 return ret;
184 }
185 *nr_zones = ret;
186 if (!ret)
187 return -EIO;
188
189 return 0;
190}
191
3c9daa09
JT		 192/* The emulated zone size is determined from the size of device extent */
193static int calculate_emulated_zone_size(struct btrfs_fs_info *fs_info)
194{
195 struct btrfs_path *path;
196 struct btrfs_root *root = fs_info->dev_root;
197 struct btrfs_key key;
198 struct extent_buffer *leaf;
199 struct btrfs_dev_extent *dext;
200 int ret = 0;
201
202 key.objectid = 1;
203 key.type = BTRFS_DEV_EXTENT_KEY;
204 key.offset = 0;
205
206 path = btrfs_alloc_path();
207 if (!path)
208 return -ENOMEM;
209
210 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
211 if (ret < 0)
212 goto out;
213
214 if (path->slots[0] >= btrfs_header_nritems(path->nodes[0])) {
215 ret = btrfs_next_item(root, path);
216 if (ret < 0)
217 goto out;
218 /* No dev extents at all? Not good */
219 if (ret > 0) {
220 ret = -EUCLEAN;
221 goto out;
222 }
223 }
224
225 leaf = path->nodes[0];
226 dext = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_dev_extent);
227 fs_info->zone_size = btrfs_dev_extent_length(leaf, dext);
228 ret = 0;
229
230out:
231 btrfs_free_path(path);
232
233 return ret;
234}
235
73651042
NA		 236int btrfs_get_dev_zone_info_all_devices(struct btrfs_fs_info *fs_info)
237{
238 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
239 struct btrfs_device *device;
240 int ret = 0;
241
242 /* fs_info->zone_size might not set yet. Use the incomapt flag here. */
243 if (!btrfs_fs_incompat(fs_info, ZONED))
244 return 0;
245
246 mutex_lock(&fs_devices->device_list_mutex);
247 list_for_each_entry(device, &fs_devices->devices, dev_list) {
248 /* We can skip reading of zone info for missing devices */
249 if (!device->bdev)
250 continue;
251
252 ret = btrfs_get_dev_zone_info(device);
253 if (ret)
254 break;
255 }
256 mutex_unlock(&fs_devices->device_list_mutex);
257
258 return ret;
259}
260
5b316468
NA		 261int btrfs_get_dev_zone_info(struct btrfs_device *device)
262{
3c9daa09 263 struct btrfs_fs_info *fs_info = device->fs_info;
5b316468
NA		 264 struct btrfs_zoned_device_info *zone_info = NULL;
265 struct block_device *bdev = device->bdev;
862931c7 266 struct request_queue *queue = bdev_get_queue(bdev);
5b316468
NA		 267 sector_t nr_sectors;
268 sector_t sector = 0;
269 struct blk_zone *zones = NULL;
270 unsigned int i, nreported = 0, nr_zones;
271 unsigned int zone_sectors;
3c9daa09 272 char *model, *emulated;
5b316468
NA		 273 int ret;
274
3c9daa09
JT		 275 /*
276 * Cannot use btrfs_is_zoned here, since fs_info::zone_size might not
277 * yet be set.
278 */
279 if (!btrfs_fs_incompat(fs_info, ZONED))
5b316468
NA		 280 return 0;
281
282 if (device->zone_info)
283 return 0;
284
285 zone_info = kzalloc(sizeof(*zone_info), GFP_KERNEL);
286 if (!zone_info)
287 return -ENOMEM;
288
3c9daa09
JT		 289 if (!bdev_is_zoned(bdev)) {
290 if (!fs_info->zone_size) {
291 ret = calculate_emulated_zone_size(fs_info);
292 if (ret)
293 goto out;
294 }
295
296 ASSERT(fs_info->zone_size);
297 zone_sectors = fs_info->zone_size >> SECTOR_SHIFT;
298 } else {
299 zone_sectors = bdev_zone_sectors(bdev);
300 }
301
ac7ac461 302 nr_sectors = bdev_nr_sectors(bdev);
5b316468
NA		 303 /* Check if it's power of 2 (see is_power_of_2) */
304 ASSERT(zone_sectors != 0 && (zone_sectors & (zone_sectors - 1)) == 0);
305 zone_info->zone_size = zone_sectors << SECTOR_SHIFT;
306 zone_info->zone_size_shift = ilog2(zone_info->zone_size);
862931c7
NA		 307 zone_info->max_zone_append_size =
308 (u64)queue_max_zone_append_sectors(queue) << SECTOR_SHIFT;
5b316468
NA		 309 zone_info->nr_zones = nr_sectors >> ilog2(zone_sectors);
310 if (!IS_ALIGNED(nr_sectors, zone_sectors))
311 zone_info->nr_zones++;
312
313 zone_info->seq_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
314 if (!zone_info->seq_zones) {
315 ret = -ENOMEM;
316 goto out;
317 }
318
319 zone_info->empty_zones = bitmap_zalloc(zone_info->nr_zones, GFP_KERNEL);
320 if (!zone_info->empty_zones) {
321 ret = -ENOMEM;
322 goto out;
323 }
324
325 zones = kcalloc(BTRFS_REPORT_NR_ZONES, sizeof(struct blk_zone), GFP_KERNEL);
326 if (!zones) {
327 ret = -ENOMEM;
328 goto out;
329 }
330
331 /* Get zones type */
332 while (sector < nr_sectors) {
333 nr_zones = BTRFS_REPORT_NR_ZONES;
334 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT, zones,
335 &nr_zones);
336 if (ret)
337 goto out;
338
339 for (i = 0; i < nr_zones; i++) {
340 if (zones[i].type == BLK_ZONE_TYPE_SEQWRITE_REQ)
341 __set_bit(nreported, zone_info->seq_zones);
342 if (zones[i].cond == BLK_ZONE_COND_EMPTY)
343 __set_bit(nreported, zone_info->empty_zones);
344 nreported++;
345 }
346 sector = zones[nr_zones - 1].start + zones[nr_zones - 1].len;
347 }
348
349 if (nreported != zone_info->nr_zones) {
350 btrfs_err_in_rcu(device->fs_info,
351 "inconsistent number of zones on %s (%u/%u)",
352 rcu_str_deref(device->name), nreported,
353 zone_info->nr_zones);
354 ret = -EIO;
355 goto out;
356 }
357
12659251
NA		 358 /* Validate superblock log */
359 nr_zones = BTRFS_NR_SB_LOG_ZONES;
360 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
361 u32 sb_zone;
362 u64 sb_wp;
363 int sb_pos = BTRFS_NR_SB_LOG_ZONES * i;
364
365 sb_zone = sb_zone_number(zone_info->zone_size_shift, i);
366 if (sb_zone + 1 >= zone_info->nr_zones)
367 continue;
368
369 sector = sb_zone << (zone_info->zone_size_shift - SECTOR_SHIFT);
370 ret = btrfs_get_dev_zones(device, sector << SECTOR_SHIFT,
371 &zone_info->sb_zones[sb_pos],
372 &nr_zones);
373 if (ret)
374 goto out;
375
376 if (nr_zones != BTRFS_NR_SB_LOG_ZONES) {
377 btrfs_err_in_rcu(device->fs_info,
378 "zoned: failed to read super block log zone info at devid %llu zone %u",
379 device->devid, sb_zone);
380 ret = -EUCLEAN;
381 goto out;
382 }
383
384 /*
385 * If zones[0] is conventional, always use the beggining of the
386 * zone to record superblock. No need to validate in that case.
387 */
388 if (zone_info->sb_zones[BTRFS_NR_SB_LOG_ZONES * i].type ==
389 BLK_ZONE_TYPE_CONVENTIONAL)
390 continue;
391
392 ret = sb_write_pointer(device->bdev,
393 &zone_info->sb_zones[sb_pos], &sb_wp);
394 if (ret != -ENOENT && ret) {
395 btrfs_err_in_rcu(device->fs_info,
396 "zoned: super block log zone corrupted devid %llu zone %u",
397 device->devid, sb_zone);
398 ret = -EUCLEAN;
399 goto out;
400 }
401 }
402
403
5b316468
NA		 404 kfree(zones);
405
406 device->zone_info = zone_info;
407
3c9daa09
JT		 408 switch (bdev_zoned_model(bdev)) {
409 case BLK_ZONED_HM:
410 model = "host-managed zoned";
411 emulated = "";
412 break;
413 case BLK_ZONED_HA:
414 model = "host-aware zoned";
415 emulated = "";
416 break;
417 case BLK_ZONED_NONE:
418 model = "regular";
419 emulated = "emulated ";
420 break;
421 default:
422 /* Just in case */
423 btrfs_err_in_rcu(fs_info, "zoned: unsupported model %d on %s",
424 bdev_zoned_model(bdev),
425 rcu_str_deref(device->name));
426 ret = -EOPNOTSUPP;
427 goto out_free_zone_info;
428 }
429
430 btrfs_info_in_rcu(fs_info,
431 "%s block device %s, %u %szones of %llu bytes",
432 model, rcu_str_deref(device->name), zone_info->nr_zones,
433 emulated, zone_info->zone_size);
5b316468
NA		 434
435 return 0;
436
437out:
438 kfree(zones);
3c9daa09 439out_free_zone_info:
5b316468
NA		 440 bitmap_free(zone_info->empty_zones);
441 bitmap_free(zone_info->seq_zones);
442 kfree(zone_info);
3c9daa09 443 device->zone_info = NULL;
5b316468
NA		 444
445 return ret;
446}
447
448void btrfs_destroy_dev_zone_info(struct btrfs_device *device)
449{
450 struct btrfs_zoned_device_info *zone_info = device->zone_info;
451
452 if (!zone_info)
453 return;
454
455 bitmap_free(zone_info->seq_zones);
456 bitmap_free(zone_info->empty_zones);
457 kfree(zone_info);
458 device->zone_info = NULL;
459}
460
461int btrfs_get_dev_zone(struct btrfs_device *device, u64 pos,
462 struct blk_zone *zone)
463{
464 unsigned int nr_zones = 1;
465 int ret;
466
467 ret = btrfs_get_dev_zones(device, pos, zone, &nr_zones);
468 if (ret != 0 || !nr_zones)
469 return ret ? ret : -EIO;
470
471 return 0;
472}
b70f5097
NA		 473
474int btrfs_check_zoned_mode(struct btrfs_fs_info *fs_info)
475{
476 struct btrfs_fs_devices *fs_devices = fs_info->fs_devices;
477 struct btrfs_device *device;
478 u64 zoned_devices = 0;
479 u64 nr_devices = 0;
480 u64 zone_size = 0;
862931c7 481 u64 max_zone_append_size = 0;
3c9daa09 482 const bool incompat_zoned = btrfs_fs_incompat(fs_info, ZONED);
b70f5097
NA		 483 int ret = 0;
484
485 /* Count zoned devices */
486 list_for_each_entry(device, &fs_devices->devices, dev_list) {
487 enum blk_zoned_model model;
488
489 if (!device->bdev)
490 continue;
491
492 model = bdev_zoned_model(device->bdev);
3c9daa09
JT		 493 /*
494 * A Host-Managed zoned device must be used as a zoned device.
495 * A Host-Aware zoned device and a non-zoned devices can be
496 * treated as a zoned device, if ZONED flag is enabled in the
497 * superblock.
498 */
b70f5097 499 if (model == BLK_ZONED_HM ||
3c9daa09
JT		 500 (model == BLK_ZONED_HA && incompat_zoned) ||
501 (model == BLK_ZONED_NONE && incompat_zoned)) {
502 struct btrfs_zoned_device_info *zone_info =
503 device->zone_info;
862931c7
NA		 504
505 zone_info = device->zone_info;
b70f5097
NA		 506 zoned_devices++;
507 if (!zone_size) {
862931c7
NA		 508 zone_size = zone_info->zone_size;
509 } else if (zone_info->zone_size != zone_size) {
b70f5097
NA		 510 btrfs_err(fs_info,
511 "zoned: unequal block device zone sizes: have %llu found %llu",
512 device->zone_info->zone_size,
513 zone_size);
514 ret = -EINVAL;
515 goto out;
516 }
862931c7
NA		 517 if (!max_zone_append_size ||
518 (zone_info->max_zone_append_size &&
519 zone_info->max_zone_append_size < max_zone_append_size))
520 max_zone_append_size =
521 zone_info->max_zone_append_size;
b70f5097
NA		 522 }
523 nr_devices++;
524 }
525
526 if (!zoned_devices && !incompat_zoned)
527 goto out;
528
529 if (!zoned_devices && incompat_zoned) {
530 /* No zoned block device found on ZONED filesystem */
531 btrfs_err(fs_info,
532 "zoned: no zoned devices found on a zoned filesystem");
533 ret = -EINVAL;
534 goto out;
535 }
536
537 if (zoned_devices && !incompat_zoned) {
538 btrfs_err(fs_info,
539 "zoned: mode not enabled but zoned device found");
540 ret = -EINVAL;
541 goto out;
542 }
543
544 if (zoned_devices != nr_devices) {
545 btrfs_err(fs_info,
546 "zoned: cannot mix zoned and regular devices");
547 ret = -EINVAL;
548 goto out;
549 }
550
551 /*
552 * stripe_size is always aligned to BTRFS_STRIPE_LEN in
553 * __btrfs_alloc_chunk(). Since we want stripe_len == zone_size,
554 * check the alignment here.
555 */
556 if (!IS_ALIGNED(zone_size, BTRFS_STRIPE_LEN)) {
557 btrfs_err(fs_info,
558 "zoned: zone size %llu not aligned to stripe %u",
559 zone_size, BTRFS_STRIPE_LEN);
560 ret = -EINVAL;
561 goto out;
562 }
563
a589dde0
NA		 564 if (btrfs_fs_incompat(fs_info, MIXED_GROUPS)) {
565 btrfs_err(fs_info, "zoned: mixed block groups not supported");
566 ret = -EINVAL;
567 goto out;
568 }
569
b70f5097 570 fs_info->zone_size = zone_size;
862931c7 571 fs_info->max_zone_append_size = max_zone_append_size;
1cd6121f 572 fs_info->fs_devices->chunk_alloc_policy = BTRFS_CHUNK_ALLOC_ZONED;
b70f5097 573
b53429ba
JT		 574 /*
575 * Check mount options here, because we might change fs_info->zoned
576 * from fs_info->zone_size.
577 */
578 ret = btrfs_check_mountopts_zoned(fs_info);
579 if (ret)
580 goto out;
581
b70f5097
NA		 582 btrfs_info(fs_info, "zoned mode enabled with zone size %llu", zone_size);
583out:
584 return ret;
585}
5d1ab66c
NA		 586
587int btrfs_check_mountopts_zoned(struct btrfs_fs_info *info)
588{
589 if (!btrfs_is_zoned(info))
590 return 0;
591
592 /*
593 * Space cache writing is not COWed. Disable that to avoid write errors
594 * in sequential zones.
595 */
596 if (btrfs_test_opt(info, SPACE_CACHE)) {
597 btrfs_err(info, "zoned: space cache v1 is not supported");
598 return -EINVAL;
599 }
600
d206e9c9
NA		 601 if (btrfs_test_opt(info, NODATACOW)) {
602 btrfs_err(info, "zoned: NODATACOW not supported");
603 return -EINVAL;
604 }
605
5d1ab66c
NA		 606 return 0;
607}
12659251
NA		 608
609static int sb_log_location(struct block_device *bdev, struct blk_zone *zones,
610 int rw, u64 *bytenr_ret)
611{
612 u64 wp;
613 int ret;
614
615 if (zones[0].type == BLK_ZONE_TYPE_CONVENTIONAL) {
616 *bytenr_ret = zones[0].start << SECTOR_SHIFT;
617 return 0;
618 }
619
620 ret = sb_write_pointer(bdev, zones, &wp);
621 if (ret != -ENOENT && ret < 0)
622 return ret;
623
624 if (rw == WRITE) {
625 struct blk_zone *reset = NULL;
626
627 if (wp == zones[0].start << SECTOR_SHIFT)
628 reset = &zones[0];
629 else if (wp == zones[1].start << SECTOR_SHIFT)
630 reset = &zones[1];
631
632 if (reset && reset->cond != BLK_ZONE_COND_EMPTY) {
633 ASSERT(reset->cond == BLK_ZONE_COND_FULL);
634
635 ret = blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
636 reset->start, reset->len,
637 GFP_NOFS);
638 if (ret)
639 return ret;
640
641 reset->cond = BLK_ZONE_COND_EMPTY;
642 reset->wp = reset->start;
643 }
644 } else if (ret != -ENOENT) {
645 /* For READ, we want the precious one */
646 if (wp == zones[0].start << SECTOR_SHIFT)
647 wp = (zones[1].start + zones[1].len) << SECTOR_SHIFT;
648 wp -= BTRFS_SUPER_INFO_SIZE;
649 }
650
651 *bytenr_ret = wp;
652 return 0;
653
654}
655
656int btrfs_sb_log_location_bdev(struct block_device *bdev, int mirror, int rw,
657 u64 *bytenr_ret)
658{
659 struct blk_zone zones[BTRFS_NR_SB_LOG_ZONES];
660 unsigned int zone_sectors;
661 u32 sb_zone;
662 int ret;
12659251
NA		 663 u8 zone_sectors_shift;
664 sector_t nr_sectors;
665 u32 nr_zones;
666
667 if (!bdev_is_zoned(bdev)) {
668 *bytenr_ret = btrfs_sb_offset(mirror);
669 return 0;
670 }
671
672 ASSERT(rw == READ || rw == WRITE);
673
674 zone_sectors = bdev_zone_sectors(bdev);
675 if (!is_power_of_2(zone_sectors))
676 return -EINVAL;
12659251 677 zone_sectors_shift = ilog2(zone_sectors);
ac7ac461 678 nr_sectors = bdev_nr_sectors(bdev);
12659251
NA		 679 nr_zones = nr_sectors >> zone_sectors_shift;
680
681 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
682 if (sb_zone + 1 >= nr_zones)
683 return -ENOENT;
684
685 ret = blkdev_report_zones(bdev, sb_zone << zone_sectors_shift,
686 BTRFS_NR_SB_LOG_ZONES, copy_zone_info_cb,
687 zones);
688 if (ret < 0)
689 return ret;
690 if (ret != BTRFS_NR_SB_LOG_ZONES)
691 return -EIO;
692
693 return sb_log_location(bdev, zones, rw, bytenr_ret);
694}
695
696int btrfs_sb_log_location(struct btrfs_device *device, int mirror, int rw,
697 u64 *bytenr_ret)
698{
699 struct btrfs_zoned_device_info *zinfo = device->zone_info;
700 u32 zone_num;
701
d6639b35
NA		 702 /*
703 * For a zoned filesystem on a non-zoned block device, use the same
704 * super block locations as regular filesystem. Doing so, the super
705 * block can always be retrieved and the zoned flag of the volume
706 * detected from the super block information.
707 */
708 if (!bdev_is_zoned(device->bdev)) {
12659251
NA		 709 *bytenr_ret = btrfs_sb_offset(mirror);
710 return 0;
711 }
712
713 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
714 if (zone_num + 1 >= zinfo->nr_zones)
715 return -ENOENT;
716
717 return sb_log_location(device->bdev,
718 &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror],
719 rw, bytenr_ret);
720}
721
722static inline bool is_sb_log_zone(struct btrfs_zoned_device_info *zinfo,
723 int mirror)
724{
725 u32 zone_num;
726
727 if (!zinfo)
728 return false;
729
730 zone_num = sb_zone_number(zinfo->zone_size_shift, mirror);
731 if (zone_num + 1 >= zinfo->nr_zones)
732 return false;
733
734 if (!test_bit(zone_num, zinfo->seq_zones))
735 return false;
736
737 return true;
738}
739
740void btrfs_advance_sb_log(struct btrfs_device *device, int mirror)
741{
742 struct btrfs_zoned_device_info *zinfo = device->zone_info;
743 struct blk_zone *zone;
744
745 if (!is_sb_log_zone(zinfo, mirror))
746 return;
747
748 zone = &zinfo->sb_zones[BTRFS_NR_SB_LOG_ZONES * mirror];
749 if (zone->cond != BLK_ZONE_COND_FULL) {
750 if (zone->cond == BLK_ZONE_COND_EMPTY)
751 zone->cond = BLK_ZONE_COND_IMP_OPEN;
752
753 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
754
755 if (zone->wp == zone->start + zone->len)
756 zone->cond = BLK_ZONE_COND_FULL;
757
758 return;
759 }
760
761 zone++;
762 ASSERT(zone->cond != BLK_ZONE_COND_FULL);
763 if (zone->cond == BLK_ZONE_COND_EMPTY)
764 zone->cond = BLK_ZONE_COND_IMP_OPEN;
765
766 zone->wp += (BTRFS_SUPER_INFO_SIZE >> SECTOR_SHIFT);
767
768 if (zone->wp == zone->start + zone->len)
769 zone->cond = BLK_ZONE_COND_FULL;
770}
771
772int btrfs_reset_sb_log_zones(struct block_device *bdev, int mirror)
773{
774 sector_t zone_sectors;
775 sector_t nr_sectors;
776 u8 zone_sectors_shift;
777 u32 sb_zone;
778 u32 nr_zones;
779
780 zone_sectors = bdev_zone_sectors(bdev);
781 zone_sectors_shift = ilog2(zone_sectors);
ac7ac461 782 nr_sectors = bdev_nr_sectors(bdev);
12659251
NA		 783 nr_zones = nr_sectors >> zone_sectors_shift;
784
785 sb_zone = sb_zone_number(zone_sectors_shift + SECTOR_SHIFT, mirror);
786 if (sb_zone + 1 >= nr_zones)
787 return -ENOENT;
788
789 return blkdev_zone_mgmt(bdev, REQ_OP_ZONE_RESET,
790 sb_zone << zone_sectors_shift,
791 zone_sectors * BTRFS_NR_SB_LOG_ZONES, GFP_NOFS);
792}
1cd6121f
NA		 793
794/**
795 * btrfs_find_allocatable_zones - find allocatable zones within a given region
796 *
797 * @device: the device to allocate a region on
798 * @hole_start: the position of the hole to allocate the region
799 * @num_bytes: size of wanted region
800 * @hole_end: the end of the hole
801 * @return: position of allocatable zones
802 *
803 * Allocatable region should not contain any superblock locations.
804 */
805u64 btrfs_find_allocatable_zones(struct btrfs_device *device, u64 hole_start,
806 u64 hole_end, u64 num_bytes)
807{
808 struct btrfs_zoned_device_info *zinfo = device->zone_info;
809 const u8 shift = zinfo->zone_size_shift;
810 u64 nzones = num_bytes >> shift;
811 u64 pos = hole_start;
812 u64 begin, end;
813 bool have_sb;
814 int i;
815
816 ASSERT(IS_ALIGNED(hole_start, zinfo->zone_size));
817 ASSERT(IS_ALIGNED(num_bytes, zinfo->zone_size));
818
819 while (pos < hole_end) {
820 begin = pos >> shift;
821 end = begin + nzones;
822
823 if (end > zinfo->nr_zones)
824 return hole_end;
825
826 /* Check if zones in the region are all empty */
827 if (btrfs_dev_is_sequential(device, pos) &&
828 find_next_zero_bit(zinfo->empty_zones, end, begin) != end) {
829 pos += zinfo->zone_size;
830 continue;
831 }
832
833 have_sb = false;
834 for (i = 0; i < BTRFS_SUPER_MIRROR_MAX; i++) {
835 u32 sb_zone;
836 u64 sb_pos;
837
838 sb_zone = sb_zone_number(shift, i);
839 if (!(end <= sb_zone ||
840 sb_zone + BTRFS_NR_SB_LOG_ZONES <= begin)) {
841 have_sb = true;
842 pos = ((u64)sb_zone + BTRFS_NR_SB_LOG_ZONES) << shift;
843 break;
844 }
845
846 /* We also need to exclude regular superblock positions */
847 sb_pos = btrfs_sb_offset(i);
848 if (!(pos + num_bytes <= sb_pos ||
849 sb_pos + BTRFS_SUPER_INFO_SIZE <= pos)) {
850 have_sb = true;
851 pos = ALIGN(sb_pos + BTRFS_SUPER_INFO_SIZE,
852 zinfo->zone_size);
853 break;
854 }
855 }
856 if (!have_sb)
857 break;
858 }
859
860 return pos;
861}
862
863int btrfs_reset_device_zone(struct btrfs_device *device, u64 physical,
864 u64 length, u64 *bytes)
865{
866 int ret;
867
868 *bytes = 0;
869 ret = blkdev_zone_mgmt(device->bdev, REQ_OP_ZONE_RESET,
870 physical >> SECTOR_SHIFT, length >> SECTOR_SHIFT,
871 GFP_NOFS);
872 if (ret)
873 return ret;
874
875 *bytes = length;
876 while (length) {
877 btrfs_dev_set_zone_empty(device, physical);
878 physical += device->zone_info->zone_size;
879 length -= device->zone_info->zone_size;
880 }
881
882 return 0;
883}
884
885int btrfs_ensure_empty_zones(struct btrfs_device *device, u64 start, u64 size)
886{
887 struct btrfs_zoned_device_info *zinfo = device->zone_info;
888 const u8 shift = zinfo->zone_size_shift;
889 unsigned long begin = start >> shift;
890 unsigned long end = (start + size) >> shift;
891 u64 pos;
892 int ret;
893
894 ASSERT(IS_ALIGNED(start, zinfo->zone_size));
895 ASSERT(IS_ALIGNED(size, zinfo->zone_size));
896
897 if (end > zinfo->nr_zones)
898 return -ERANGE;
899
900 /* All the zones are conventional */
901 if (find_next_bit(zinfo->seq_zones, begin, end) == end)
902 return 0;
903
904 /* All the zones are sequential and empty */
905 if (find_next_zero_bit(zinfo->seq_zones, begin, end) == end &&
906 find_next_zero_bit(zinfo->empty_zones, begin, end) == end)
907 return 0;
908
909 for (pos = start; pos < start + size; pos += zinfo->zone_size) {
910 u64 reset_bytes;
911
912 if (!btrfs_dev_is_sequential(device, pos) ||
913 btrfs_dev_is_empty_zone(device, pos))
914 continue;
915
916 /* Free regions should be empty */
917 btrfs_warn_in_rcu(
918 device->fs_info,
919 "zoned: resetting device %s (devid %llu) zone %llu for allocation",
920 rcu_str_deref(device->name), device->devid, pos >> shift);
921 WARN_ON_ONCE(1);
922
923 ret = btrfs_reset_device_zone(device, pos, zinfo->zone_size,
924 &reset_bytes);
925 if (ret)
926 return ret;
927 }
928
929 return 0;
930}
08e11a3d 931
a94794d5
NA		 932/*
933 * Calculate an allocation pointer from the extent allocation information
934 * for a block group consist of conventional zones. It is pointed to the
935 * end of the highest addressed extent in the block group as an allocation
936 * offset.
937 */
938static int calculate_alloc_pointer(struct btrfs_block_group *cache,
939 u64 *offset_ret)
940{
941 struct btrfs_fs_info *fs_info = cache->fs_info;
942 struct btrfs_root *root = fs_info->extent_root;
943 struct btrfs_path *path;
944 struct btrfs_key key;
945 struct btrfs_key found_key;
946 int ret;
947 u64 length;
948
949 path = btrfs_alloc_path();
950 if (!path)
951 return -ENOMEM;
952
953 key.objectid = cache->start + cache->length;
954 key.type = 0;
955 key.offset = 0;
956
957 ret = btrfs_search_slot(NULL, root, &key, path, 0, 0);
958 /* We should not find the exact match */
959 if (!ret)
960 ret = -EUCLEAN;
961 if (ret < 0)
962 goto out;
963
964 ret = btrfs_previous_extent_item(root, path, cache->start);
965 if (ret) {
966 if (ret == 1) {
967 ret = 0;
968 *offset_ret = 0;
969 }
970 goto out;
971 }
972
973 btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]);
974
975 if (found_key.type == BTRFS_EXTENT_ITEM_KEY)
976 length = found_key.offset;
977 else
978 length = fs_info->nodesize;
979
980 if (!(found_key.objectid >= cache->start &&
981 found_key.objectid + length <= cache->start + cache->length)) {
982 ret = -EUCLEAN;
983 goto out;
984 }
985 *offset_ret = found_key.objectid + length - cache->start;
986 ret = 0;
987
988out:
989 btrfs_free_path(path);
990 return ret;
991}
992
993int btrfs_load_block_group_zone_info(struct btrfs_block_group *cache, bool new)
08e11a3d
NA		 994{
995 struct btrfs_fs_info *fs_info = cache->fs_info;
996 struct extent_map_tree *em_tree = &fs_info->mapping_tree;
997 struct extent_map *em;
998 struct map_lookup *map;
999 struct btrfs_device *device;
1000 u64 logical = cache->start;
1001 u64 length = cache->length;
1002 u64 physical = 0;
1003 int ret;
1004 int i;
1005 unsigned int nofs_flag;
1006 u64 *alloc_offsets = NULL;
a94794d5 1007 u64 last_alloc = 0;
08e11a3d
NA		 1008 u32 num_sequential = 0, num_conventional = 0;
1009
1010 if (!btrfs_is_zoned(fs_info))
1011 return 0;
1012
1013 /* Sanity check */
1014 if (!IS_ALIGNED(length, fs_info->zone_size)) {
1015 btrfs_err(fs_info,
1016 "zoned: block group %llu len %llu unaligned to zone size %llu",
1017 logical, length, fs_info->zone_size);
1018 return -EIO;
1019 }
1020
1021 /* Get the chunk mapping */
1022 read_lock(&em_tree->lock);
1023 em = lookup_extent_mapping(em_tree, logical, length);
1024 read_unlock(&em_tree->lock);
1025
1026 if (!em)
1027 return -EINVAL;
1028
1029 map = em->map_lookup;
1030
1031 alloc_offsets = kcalloc(map->num_stripes, sizeof(*alloc_offsets), GFP_NOFS);
1032 if (!alloc_offsets) {
1033 free_extent_map(em);
1034 return -ENOMEM;
1035 }
1036
1037 for (i = 0; i < map->num_stripes; i++) {
1038 bool is_sequential;
1039 struct blk_zone zone;
6143c23c
NA		 1040 struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace;
1041 int dev_replace_is_ongoing = 0;
08e11a3d
NA		 1042
1043 device = map->stripes[i].dev;
1044 physical = map->stripes[i].physical;
1045
1046 if (device->bdev == NULL) {
1047 alloc_offsets[i] = WP_MISSING_DEV;
1048 continue;
1049 }
1050
1051 is_sequential = btrfs_dev_is_sequential(device, physical);
1052 if (is_sequential)
1053 num_sequential++;
1054 else
1055 num_conventional++;
1056
1057 if (!is_sequential) {
1058 alloc_offsets[i] = WP_CONVENTIONAL;
1059 continue;
1060 }
1061
1062 /*
1063 * This zone will be used for allocation, so mark this zone
1064 * non-empty.
1065 */
1066 btrfs_dev_clear_zone_empty(device, physical);
1067
6143c23c
NA		 1068 down_read(&dev_replace->rwsem);
1069 dev_replace_is_ongoing = btrfs_dev_replace_is_ongoing(dev_replace);
1070 if (dev_replace_is_ongoing && dev_replace->tgtdev != NULL)
1071 btrfs_dev_clear_zone_empty(dev_replace->tgtdev, physical);
1072 up_read(&dev_replace->rwsem);
1073
08e11a3d
NA		 1074 /*
1075 * The group is mapped to a sequential zone. Get the zone write
1076 * pointer to determine the allocation offset within the zone.
1077 */
1078 WARN_ON(!IS_ALIGNED(physical, fs_info->zone_size));
1079 nofs_flag = memalloc_nofs_save();
1080 ret = btrfs_get_dev_zone(device, physical, &zone);
1081 memalloc_nofs_restore(nofs_flag);
1082 if (ret == -EIO || ret == -EOPNOTSUPP) {
1083 ret = 0;
1084 alloc_offsets[i] = WP_MISSING_DEV;
1085 continue;
1086 } else if (ret) {
1087 goto out;
1088 }
1089
1090 switch (zone.cond) {
1091 case BLK_ZONE_COND_OFFLINE:
1092 case BLK_ZONE_COND_READONLY:
1093 btrfs_err(fs_info,
1094 "zoned: offline/readonly zone %llu on device %s (devid %llu)",
1095 physical >> device->zone_info->zone_size_shift,
1096 rcu_str_deref(device->name), device->devid);
1097 alloc_offsets[i] = WP_MISSING_DEV;
1098 break;
1099 case BLK_ZONE_COND_EMPTY:
1100 alloc_offsets[i] = 0;
1101 break;
1102 case BLK_ZONE_COND_FULL:
1103 alloc_offsets[i] = fs_info->zone_size;
1104 break;
1105 default:
1106 /* Partially used zone */
1107 alloc_offsets[i] =
1108 ((zone.wp - zone.start) << SECTOR_SHIFT);
1109 break;
1110 }
1111 }
1112
08f45559
JT		 1113 if (num_sequential > 0)
1114 cache->seq_zone = true;
1115
08e11a3d
NA		 1116 if (num_conventional > 0) {
1117 /*
a94794d5
NA		 1118 * Avoid calling calculate_alloc_pointer() for new BG. It
1119 * is no use for new BG. It must be always 0.
1120 *
1121 * Also, we have a lock chain of extent buffer lock ->
1122 * chunk mutex. For new BG, this function is called from
1123 * btrfs_make_block_group() which is already taking the
1124 * chunk mutex. Thus, we cannot call
1125 * calculate_alloc_pointer() which takes extent buffer
1126 * locks to avoid deadlock.
08e11a3d 1127 */
a94794d5
NA		 1128 if (new) {
1129 cache->alloc_offset = 0;
1130 goto out;
1131 }
1132 ret = calculate_alloc_pointer(cache, &last_alloc);
1133 if (ret || map->num_stripes == num_conventional) {
1134 if (!ret)
1135 cache->alloc_offset = last_alloc;
1136 else
1137 btrfs_err(fs_info,
1138 "zoned: failed to determine allocation offset of bg %llu",
1139 cache->start);
1140 goto out;
1141 }
08e11a3d
NA		 1142 }
1143
1144 switch (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
1145 case 0: /* single */
1146 cache->alloc_offset = alloc_offsets[0];
1147 break;
1148 case BTRFS_BLOCK_GROUP_DUP:
1149 case BTRFS_BLOCK_GROUP_RAID1:
1150 case BTRFS_BLOCK_GROUP_RAID0:
1151 case BTRFS_BLOCK_GROUP_RAID10:
1152 case BTRFS_BLOCK_GROUP_RAID5:
1153 case BTRFS_BLOCK_GROUP_RAID6:
1154 /* non-single profiles are not supported yet */
1155 default:
1156 btrfs_err(fs_info, "zoned: profile %s not yet supported",
1157 btrfs_bg_type_to_raid_name(map->type));
1158 ret = -EINVAL;
1159 goto out;
1160 }
1161
1162out:
a94794d5
NA		 1163 /* An extent is allocated after the write pointer */
1164 if (!ret && num_conventional && last_alloc > cache->alloc_offset) {
1165 btrfs_err(fs_info,
1166 "zoned: got wrong write pointer in BG %llu: %llu > %llu",
1167 logical, last_alloc, cache->alloc_offset);
1168 ret = -EIO;
1169 }
1170
0bc09ca1
NA		 1171 if (!ret)
1172 cache->meta_write_pointer = cache->alloc_offset + cache->start;
1173
08e11a3d
NA		 1174 kfree(alloc_offsets);
1175 free_extent_map(em);
1176
1177 return ret;
1178}
169e0da9
NA		 1179
1180void btrfs_calc_zone_unusable(struct btrfs_block_group *cache)
1181{
1182 u64 unusable, free;
1183
1184 if (!btrfs_is_zoned(cache->fs_info))
1185 return;
1186
1187 WARN_ON(cache->bytes_super != 0);
1188 unusable = cache->alloc_offset - cache->used;
1189 free = cache->length - cache->alloc_offset;
1190
1191 /* We only need ->free_space in ALLOC_SEQ block groups */
1192 cache->last_byte_to_unpin = (u64)-1;
1193 cache->cached = BTRFS_CACHE_FINISHED;
1194 cache->free_space_ctl->free_space = free;
1195 cache->zone_unusable = unusable;
1196
1197 /* Should not have any excluded extents. Just in case, though */
1198 btrfs_free_excluded_extents(cache);
1199}
d3575156
NA		 1200
1201void btrfs_redirty_list_add(struct btrfs_transaction *trans,
1202 struct extent_buffer *eb)
1203{
1204 struct btrfs_fs_info *fs_info = eb->fs_info;
1205
1206 if (!btrfs_is_zoned(fs_info) ||
1207 btrfs_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN) ||
1208 !list_empty(&eb->release_list))
1209 return;
1210
1211 set_extent_buffer_dirty(eb);
1212 set_extent_bits_nowait(&trans->dirty_pages, eb->start,
1213 eb->start + eb->len - 1, EXTENT_DIRTY);
1214 memzero_extent_buffer(eb, 0, eb->len);
1215 set_bit(EXTENT_BUFFER_NO_CHECK, &eb->bflags);
1216
1217 spin_lock(&trans->releasing_ebs_lock);
1218 list_add_tail(&eb->release_list, &trans->releasing_ebs);
1219 spin_unlock(&trans->releasing_ebs_lock);
1220 atomic_inc(&eb->refs);
1221}
1222
1223void btrfs_free_redirty_list(struct btrfs_transaction *trans)
1224{
1225 spin_lock(&trans->releasing_ebs_lock);
1226 while (!list_empty(&trans->releasing_ebs)) {
1227 struct extent_buffer *eb;
1228
1229 eb = list_first_entry(&trans->releasing_ebs,
1230 struct extent_buffer, release_list);
1231 list_del_init(&eb->release_list);
1232 free_extent_buffer(eb);
1233 }
1234 spin_unlock(&trans->releasing_ebs_lock);
1235}
08f45559
JT		 1236
1237bool btrfs_use_zone_append(struct btrfs_inode *inode, struct extent_map *em)
1238{
1239 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1240 struct btrfs_block_group *cache;
1241 bool ret = false;
1242
1243 if (!btrfs_is_zoned(fs_info))
1244 return false;
1245
1246 if (!fs_info->max_zone_append_size)
1247 return false;
1248
1249 if (!is_data_inode(&inode->vfs_inode))
1250 return false;
1251
1252 cache = btrfs_lookup_block_group(fs_info, em->block_start);
1253 ASSERT(cache);
1254 if (!cache)
1255 return false;
1256
1257 ret = cache->seq_zone;
1258 btrfs_put_block_group(cache);
1259
1260 return ret;
1261}
d8e3fb10
NA		 1262
1263void btrfs_record_physical_zoned(struct inode *inode, u64 file_offset,
1264 struct bio *bio)
1265{
1266 struct btrfs_ordered_extent *ordered;
1267 const u64 physical = bio->bi_iter.bi_sector << SECTOR_SHIFT;
1268
1269 if (bio_op(bio) != REQ_OP_ZONE_APPEND)
1270 return;
1271
1272 ordered = btrfs_lookup_ordered_extent(BTRFS_I(inode), file_offset);
1273 if (WARN_ON(!ordered))
1274 return;
1275
1276 ordered->physical = physical;
1277 ordered->disk = bio->bi_disk;
1278 ordered->partno = bio->bi_partno;
1279
1280 btrfs_put_ordered_extent(ordered);
1281}
1282
1283void btrfs_rewrite_logical_zoned(struct btrfs_ordered_extent *ordered)
1284{
1285 struct btrfs_inode *inode = BTRFS_I(ordered->inode);
1286 struct btrfs_fs_info *fs_info = inode->root->fs_info;
1287 struct extent_map_tree *em_tree;
1288 struct extent_map *em;
1289 struct btrfs_ordered_sum *sum;
1290 struct block_device *bdev;
1291 u64 orig_logical = ordered->disk_bytenr;
1292 u64 *logical = NULL;
1293 int nr, stripe_len;
1294
1295 /* Zoned devices should not have partitions. So, we can assume it is 0 */
1296 ASSERT(ordered->partno == 0);
1297 bdev = bdgrab(ordered->disk->part0);
1298 if (WARN_ON(!bdev))
1299 return;
1300
1301 if (WARN_ON(btrfs_rmap_block(fs_info, orig_logical, bdev,
1302 ordered->physical, &logical, &nr,
1303 &stripe_len)))
1304 goto out;
1305
1306 WARN_ON(nr != 1);
1307
1308 if (orig_logical == *logical)
1309 goto out;
1310
1311 ordered->disk_bytenr = *logical;
1312
1313 em_tree = &inode->extent_tree;
1314 write_lock(&em_tree->lock);
1315 em = search_extent_mapping(em_tree, ordered->file_offset,
1316 ordered->num_bytes);
1317 em->block_start = *logical;
1318 free_extent_map(em);
1319 write_unlock(&em_tree->lock);
1320
1321 list_for_each_entry(sum, &ordered->list, list) {
1322 if (*logical < orig_logical)
1323 sum->bytenr -= orig_logical - *logical;
1324 else
1325 sum->bytenr += *logical - orig_logical;
1326 }
1327
1328out:
1329 kfree(logical);
1330 bdput(bdev);
1331}
0bc09ca1
NA		 1332
1333bool btrfs_check_meta_write_pointer(struct btrfs_fs_info *fs_info,
1334 struct extent_buffer *eb,
1335 struct btrfs_block_group **cache_ret)
1336{
1337 struct btrfs_block_group *cache;
1338 bool ret = true;
1339
1340 if (!btrfs_is_zoned(fs_info))
1341 return true;
1342
1343 cache = *cache_ret;
1344
1345 if (cache && (eb->start < cache->start ||
1346 cache->start + cache->length <= eb->start)) {
1347 btrfs_put_block_group(cache);
1348 cache = NULL;
1349 *cache_ret = NULL;
1350 }
1351
1352 if (!cache)
1353 cache = btrfs_lookup_block_group(fs_info, eb->start);
1354
1355 if (cache) {
1356 if (cache->meta_write_pointer != eb->start) {
1357 btrfs_put_block_group(cache);
1358 cache = NULL;
1359 ret = false;
1360 } else {
1361 cache->meta_write_pointer = eb->start + eb->len;
1362 }
1363
1364 *cache_ret = cache;
1365 }
1366
1367 return ret;
1368}
1369
1370void btrfs_revert_meta_write_pointer(struct btrfs_block_group *cache,
1371 struct extent_buffer *eb)
1372{
1373 if (!btrfs_is_zoned(eb->fs_info) || !cache)
1374 return;
1375
1376 ASSERT(cache->meta_write_pointer == eb->start + eb->len);
1377 cache->meta_write_pointer = eb->start;
1378}
de17addc
NA		 1379
1380int btrfs_zoned_issue_zeroout(struct btrfs_device *device, u64 physical, u64 length)
1381{
1382 if (!btrfs_dev_is_sequential(device, physical))
1383 return -EOPNOTSUPP;
1384
1385 return blkdev_issue_zeroout(device->bdev, physical >> SECTOR_SHIFT,
1386 length >> SECTOR_SHIFT, GFP_NOFS, 0);
1387}
Linux 6.x block layer and io_uring tree(s)