1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Zoned block device handling
4  *
5  * Copyright (c) 2015, Hannes Reinecke
6  * Copyright (c) 2015, SUSE Linux GmbH
7  *
8  * Copyright (c) 2016, Damien Le Moal
9  * Copyright (c) 2016, Western Digital
10  */
11 
12 #include <linux/kernel.h>
13 #include <linux/module.h>
14 #include <linux/rbtree.h>
15 #include <linux/blkdev.h>
16 #include <linux/blk-mq.h>
17 #include <linux/mm.h>
18 #include <linux/vmalloc.h>
19 #include <linux/sched/mm.h>
20 
21 #include "blk.h"
22 
23 #define ZONE_COND_NAME(name) [BLK_ZONE_COND_##name] = #name
24 static const char *const zone_cond_name[] = {
25 	ZONE_COND_NAME(NOT_WP),
26 	ZONE_COND_NAME(EMPTY),
27 	ZONE_COND_NAME(IMP_OPEN),
28 	ZONE_COND_NAME(EXP_OPEN),
29 	ZONE_COND_NAME(CLOSED),
30 	ZONE_COND_NAME(READONLY),
31 	ZONE_COND_NAME(FULL),
32 	ZONE_COND_NAME(OFFLINE),
33 };
34 #undef ZONE_COND_NAME
35 
36 /**
37  * blk_zone_cond_str - Return string XXX in BLK_ZONE_COND_XXX.
38  * @zone_cond: BLK_ZONE_COND_XXX.
39  *
40  * Description: Centralize block layer function to convert BLK_ZONE_COND_XXX
41  * into string format. Useful in the debugging and tracing zone conditions. For
42  * invalid BLK_ZONE_COND_XXX it returns string "UNKNOWN".
43  */
blk_zone_cond_str(enum blk_zone_cond zone_cond)44 const char *blk_zone_cond_str(enum blk_zone_cond zone_cond)
45 {
46 	static const char *zone_cond_str = "UNKNOWN";
47 
48 	if (zone_cond < ARRAY_SIZE(zone_cond_name) && zone_cond_name[zone_cond])
49 		zone_cond_str = zone_cond_name[zone_cond];
50 
51 	return zone_cond_str;
52 }
53 EXPORT_SYMBOL_GPL(blk_zone_cond_str);
54 
55 /*
56  * Return true if a request is a write requests that needs zone write locking.
57  */
blk_req_needs_zone_write_lock(struct request * rq)58 bool blk_req_needs_zone_write_lock(struct request *rq)
59 {
60 	if (!rq->q->seq_zones_wlock)
61 		return false;
62 
63 	if (blk_rq_is_passthrough(rq))
64 		return false;
65 
66 	switch (req_op(rq)) {
67 	case REQ_OP_WRITE_ZEROES:
68 	case REQ_OP_WRITE_SAME:
69 	case REQ_OP_WRITE:
70 		return blk_rq_zone_is_seq(rq);
71 	default:
72 		return false;
73 	}
74 }
75 EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
76 
blk_req_zone_write_trylock(struct request * rq)77 bool blk_req_zone_write_trylock(struct request *rq)
78 {
79 	unsigned int zno = blk_rq_zone_no(rq);
80 
81 	if (test_and_set_bit(zno, rq->q->seq_zones_wlock))
82 		return false;
83 
84 	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
85 	rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
86 
87 	return true;
88 }
89 EXPORT_SYMBOL_GPL(blk_req_zone_write_trylock);
90 
__blk_req_zone_write_lock(struct request * rq)91 void __blk_req_zone_write_lock(struct request *rq)
92 {
93 	if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
94 					  rq->q->seq_zones_wlock)))
95 		return;
96 
97 	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
98 	rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
99 }
100 EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);
101 
__blk_req_zone_write_unlock(struct request * rq)102 void __blk_req_zone_write_unlock(struct request *rq)
103 {
104 	rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
105 	if (rq->q->seq_zones_wlock)
106 		WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
107 						 rq->q->seq_zones_wlock));
108 }
109 EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
110 
111 /**
112  * blkdev_nr_zones - Get number of zones
113  * @disk:	Target gendisk
114  *
115  * Return the total number of zones of a zoned block device.  For a block
116  * device without zone capabilities, the number of zones is always 0.
117  */
blkdev_nr_zones(struct gendisk * disk)118 unsigned int blkdev_nr_zones(struct gendisk *disk)
119 {
120 	sector_t zone_sectors = blk_queue_zone_sectors(disk->queue);
121 
122 	if (!blk_queue_is_zoned(disk->queue))
123 		return 0;
124 	return (get_capacity(disk) + zone_sectors - 1) >> ilog2(zone_sectors);
125 }
126 EXPORT_SYMBOL_GPL(blkdev_nr_zones);
127 
128 /**
129  * blkdev_report_zones - Get zones information
130  * @bdev:	Target block device
131  * @sector:	Sector from which to report zones
132  * @nr_zones:	Maximum number of zones to report
133  * @cb:		Callback function called for each reported zone
134  * @data:	Private data for the callback
135  *
136  * Description:
137  *    Get zone information starting from the zone containing @sector for at most
138  *    @nr_zones, and call @cb for each zone reported by the device.
139  *    To report all zones in a device starting from @sector, the BLK_ALL_ZONES
140  *    constant can be passed to @nr_zones.
141  *    Returns the number of zones reported by the device, or a negative errno
142  *    value in case of failure.
143  *
144  *    Note: The caller must use memalloc_noXX_save/restore() calls to control
145  *    memory allocations done within this function.
146  */
blkdev_report_zones(struct block_device * bdev,sector_t sector,unsigned int nr_zones,report_zones_cb cb,void * data)147 int blkdev_report_zones(struct block_device *bdev, sector_t sector,
148 			unsigned int nr_zones, report_zones_cb cb, void *data)
149 {
150 	struct gendisk *disk = bdev->bd_disk;
151 	sector_t capacity = get_capacity(disk);
152 
153 	if (!blk_queue_is_zoned(bdev_get_queue(bdev)) ||
154 	    WARN_ON_ONCE(!disk->fops->report_zones))
155 		return -EOPNOTSUPP;
156 
157 	if (!nr_zones || sector >= capacity)
158 		return 0;
159 
160 	return disk->fops->report_zones(disk, sector, nr_zones, cb, data);
161 }
162 EXPORT_SYMBOL_GPL(blkdev_report_zones);
163 
blk_alloc_zone_bitmap(int node,unsigned int nr_zones)164 static inline unsigned long *blk_alloc_zone_bitmap(int node,
165 						   unsigned int nr_zones)
166 {
167 	return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
168 			    GFP_NOIO, node);
169 }
170 
blk_zone_need_reset_cb(struct blk_zone * zone,unsigned int idx,void * data)171 static int blk_zone_need_reset_cb(struct blk_zone *zone, unsigned int idx,
172 				  void *data)
173 {
174 	/*
175 	 * For an all-zones reset, ignore conventional, empty, read-only
176 	 * and offline zones.
177 	 */
178 	switch (zone->cond) {
179 	case BLK_ZONE_COND_NOT_WP:
180 	case BLK_ZONE_COND_EMPTY:
181 	case BLK_ZONE_COND_READONLY:
182 	case BLK_ZONE_COND_OFFLINE:
183 		return 0;
184 	default:
185 		set_bit(idx, (unsigned long *)data);
186 		return 0;
187 	}
188 }
189 
blkdev_zone_reset_all_emulated(struct block_device * bdev,gfp_t gfp_mask)190 static int blkdev_zone_reset_all_emulated(struct block_device *bdev,
191 					  gfp_t gfp_mask)
192 {
193 	struct request_queue *q = bdev_get_queue(bdev);
194 	sector_t capacity = get_capacity(bdev->bd_disk);
195 	sector_t zone_sectors = blk_queue_zone_sectors(q);
196 	unsigned long *need_reset;
197 	struct bio *bio = NULL;
198 	sector_t sector = 0;
199 	int ret;
200 
201 	need_reset = blk_alloc_zone_bitmap(q->node, q->nr_zones);
202 	if (!need_reset)
203 		return -ENOMEM;
204 
205 	ret = bdev->bd_disk->fops->report_zones(bdev->bd_disk, 0,
206 				q->nr_zones, blk_zone_need_reset_cb,
207 				need_reset);
208 	if (ret < 0)
209 		goto out_free_need_reset;
210 
211 	ret = 0;
212 	while (sector < capacity) {
213 		if (!test_bit(blk_queue_zone_no(q, sector), need_reset)) {
214 			sector += zone_sectors;
215 			continue;
216 		}
217 
218 		bio = blk_next_bio(bio, 0, gfp_mask);
219 		bio_set_dev(bio, bdev);
220 		bio->bi_opf = REQ_OP_ZONE_RESET | REQ_SYNC;
221 		bio->bi_iter.bi_sector = sector;
222 		sector += zone_sectors;
223 
224 		/* This may take a while, so be nice to others */
225 		cond_resched();
226 	}
227 
228 	if (bio) {
229 		ret = submit_bio_wait(bio);
230 		bio_put(bio);
231 	}
232 
233 out_free_need_reset:
234 	kfree(need_reset);
235 	return ret;
236 }
237 
blkdev_zone_reset_all(struct block_device * bdev,gfp_t gfp_mask)238 static int blkdev_zone_reset_all(struct block_device *bdev, gfp_t gfp_mask)
239 {
240 	struct bio bio;
241 
242 	bio_init(&bio, NULL, 0);
243 	bio_set_dev(&bio, bdev);
244 	bio.bi_opf = REQ_OP_ZONE_RESET_ALL | REQ_SYNC;
245 
246 	return submit_bio_wait(&bio);
247 }
248 
249 /**
250  * blkdev_zone_mgmt - Execute a zone management operation on a range of zones
251  * @bdev:	Target block device
252  * @op:		Operation to be performed on the zones
253  * @sector:	Start sector of the first zone to operate on
254  * @nr_sectors:	Number of sectors, should be at least the length of one zone and
255  *		must be zone size aligned.
256  * @gfp_mask:	Memory allocation flags (for bio_alloc)
257  *
258  * Description:
259  *    Perform the specified operation on the range of zones specified by
260  *    @sector..@sector+@nr_sectors. Specifying the entire disk sector range
261  *    is valid, but the specified range should not contain conventional zones.
262  *    The operation to execute on each zone can be a zone reset, open, close
263  *    or finish request.
264  */
blkdev_zone_mgmt(struct block_device * bdev,enum req_opf op,sector_t sector,sector_t nr_sectors,gfp_t gfp_mask)265 int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
266 		     sector_t sector, sector_t nr_sectors,
267 		     gfp_t gfp_mask)
268 {
269 	struct request_queue *q = bdev_get_queue(bdev);
270 	sector_t zone_sectors = blk_queue_zone_sectors(q);
271 	sector_t capacity = get_capacity(bdev->bd_disk);
272 	sector_t end_sector = sector + nr_sectors;
273 	struct bio *bio = NULL;
274 	int ret = 0;
275 
276 	if (!blk_queue_is_zoned(q))
277 		return -EOPNOTSUPP;
278 
279 	if (bdev_read_only(bdev))
280 		return -EPERM;
281 
282 	if (!op_is_zone_mgmt(op))
283 		return -EOPNOTSUPP;
284 
285 	if (end_sector <= sector || end_sector > capacity)
286 		/* Out of range */
287 		return -EINVAL;
288 
289 	/* Check alignment (handle eventual smaller last zone) */
290 	if (sector & (zone_sectors - 1))
291 		return -EINVAL;
292 
293 	if ((nr_sectors & (zone_sectors - 1)) && end_sector != capacity)
294 		return -EINVAL;
295 
296 	/*
297 	 * In the case of a zone reset operation over all zones,
298 	 * REQ_OP_ZONE_RESET_ALL can be used with devices supporting this
299 	 * command. For other devices, we emulate this command behavior by
300 	 * identifying the zones needing a reset.
301 	 */
302 	if (op == REQ_OP_ZONE_RESET && sector == 0 && nr_sectors == capacity) {
303 		if (!blk_queue_zone_resetall(q))
304 			return blkdev_zone_reset_all_emulated(bdev, gfp_mask);
305 		return blkdev_zone_reset_all(bdev, gfp_mask);
306 	}
307 
308 	while (sector < end_sector) {
309 		bio = blk_next_bio(bio, 0, gfp_mask);
310 		bio_set_dev(bio, bdev);
311 		bio->bi_opf = op | REQ_SYNC;
312 		bio->bi_iter.bi_sector = sector;
313 		sector += zone_sectors;
314 
315 		/* This may take a while, so be nice to others */
316 		cond_resched();
317 	}
318 
319 	ret = submit_bio_wait(bio);
320 	bio_put(bio);
321 
322 	return ret;
323 }
324 EXPORT_SYMBOL_GPL(blkdev_zone_mgmt);
325 
326 struct zone_report_args {
327 	struct blk_zone __user *zones;
328 };
329 
blkdev_copy_zone_to_user(struct blk_zone * zone,unsigned int idx,void * data)330 static int blkdev_copy_zone_to_user(struct blk_zone *zone, unsigned int idx,
331 				    void *data)
332 {
333 	struct zone_report_args *args = data;
334 
335 	if (copy_to_user(&args->zones[idx], zone, sizeof(struct blk_zone)))
336 		return -EFAULT;
337 	return 0;
338 }
339 
340 /*
341  * BLKREPORTZONE ioctl processing.
342  * Called from blkdev_ioctl.
343  */
blkdev_report_zones_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)344 int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
345 			      unsigned int cmd, unsigned long arg)
346 {
347 	void __user *argp = (void __user *)arg;
348 	struct zone_report_args args;
349 	struct request_queue *q;
350 	struct blk_zone_report rep;
351 	int ret;
352 
353 	if (!argp)
354 		return -EINVAL;
355 
356 	q = bdev_get_queue(bdev);
357 	if (!q)
358 		return -ENXIO;
359 
360 	if (!blk_queue_is_zoned(q))
361 		return -ENOTTY;
362 
363 	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
364 		return -EFAULT;
365 
366 	if (!rep.nr_zones)
367 		return -EINVAL;
368 
369 	args.zones = argp + sizeof(struct blk_zone_report);
370 	ret = blkdev_report_zones(bdev, rep.sector, rep.nr_zones,
371 				  blkdev_copy_zone_to_user, &args);
372 	if (ret < 0)
373 		return ret;
374 
375 	rep.nr_zones = ret;
376 	rep.flags = BLK_ZONE_REP_CAPACITY;
377 	if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report)))
378 		return -EFAULT;
379 	return 0;
380 }
381 
blkdev_truncate_zone_range(struct block_device * bdev,fmode_t mode,const struct blk_zone_range * zrange)382 static int blkdev_truncate_zone_range(struct block_device *bdev, fmode_t mode,
383 				      const struct blk_zone_range *zrange)
384 {
385 	loff_t start, end;
386 
387 	if (zrange->sector + zrange->nr_sectors <= zrange->sector ||
388 	    zrange->sector + zrange->nr_sectors > get_capacity(bdev->bd_disk))
389 		/* Out of range */
390 		return -EINVAL;
391 
392 	start = zrange->sector << SECTOR_SHIFT;
393 	end = ((zrange->sector + zrange->nr_sectors) << SECTOR_SHIFT) - 1;
394 
395 	return truncate_bdev_range(bdev, mode, start, end);
396 }
397 
398 /*
399  * BLKRESETZONE, BLKOPENZONE, BLKCLOSEZONE and BLKFINISHZONE ioctl processing.
400  * Called from blkdev_ioctl.
401  */
blkdev_zone_mgmt_ioctl(struct block_device * bdev,fmode_t mode,unsigned int cmd,unsigned long arg)402 int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
403 			   unsigned int cmd, unsigned long arg)
404 {
405 	void __user *argp = (void __user *)arg;
406 	struct request_queue *q;
407 	struct blk_zone_range zrange;
408 	enum req_opf op;
409 	int ret;
410 
411 	if (!argp)
412 		return -EINVAL;
413 
414 	q = bdev_get_queue(bdev);
415 	if (!q)
416 		return -ENXIO;
417 
418 	if (!blk_queue_is_zoned(q))
419 		return -ENOTTY;
420 
421 	if (!(mode & FMODE_WRITE))
422 		return -EBADF;
423 
424 	if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
425 		return -EFAULT;
426 
427 	switch (cmd) {
428 	case BLKRESETZONE:
429 		op = REQ_OP_ZONE_RESET;
430 
431 		/* Invalidate the page cache, including dirty pages. */
432 		filemap_invalidate_lock(bdev->bd_inode->i_mapping);
433 		ret = blkdev_truncate_zone_range(bdev, mode, &zrange);
434 		if (ret)
435 			goto fail;
436 		break;
437 	case BLKOPENZONE:
438 		op = REQ_OP_ZONE_OPEN;
439 		break;
440 	case BLKCLOSEZONE:
441 		op = REQ_OP_ZONE_CLOSE;
442 		break;
443 	case BLKFINISHZONE:
444 		op = REQ_OP_ZONE_FINISH;
445 		break;
446 	default:
447 		return -ENOTTY;
448 	}
449 
450 	ret = blkdev_zone_mgmt(bdev, op, zrange.sector, zrange.nr_sectors,
451 			       GFP_KERNEL);
452 
453 fail:
454 	if (cmd == BLKRESETZONE)
455 		filemap_invalidate_unlock(bdev->bd_inode->i_mapping);
456 
457 	return ret;
458 }
459 
blk_queue_free_zone_bitmaps(struct request_queue * q)460 void blk_queue_free_zone_bitmaps(struct request_queue *q)
461 {
462 	kfree(q->conv_zones_bitmap);
463 	q->conv_zones_bitmap = NULL;
464 	kfree(q->seq_zones_wlock);
465 	q->seq_zones_wlock = NULL;
466 }
467 
468 struct blk_revalidate_zone_args {
469 	struct gendisk	*disk;
470 	unsigned long	*conv_zones_bitmap;
471 	unsigned long	*seq_zones_wlock;
472 	unsigned int	nr_zones;
473 	sector_t	zone_sectors;
474 	sector_t	sector;
475 };
476 
477 /*
478  * Helper function to check the validity of zones of a zoned block device.
479  */
blk_revalidate_zone_cb(struct blk_zone * zone,unsigned int idx,void * data)480 static int blk_revalidate_zone_cb(struct blk_zone *zone, unsigned int idx,
481 				  void *data)
482 {
483 	struct blk_revalidate_zone_args *args = data;
484 	struct gendisk *disk = args->disk;
485 	struct request_queue *q = disk->queue;
486 	sector_t capacity = get_capacity(disk);
487 
488 	/*
489 	 * All zones must have the same size, with the exception on an eventual
490 	 * smaller last zone.
491 	 */
492 	if (zone->start == 0) {
493 		if (zone->len == 0 || !is_power_of_2(zone->len)) {
494 			pr_warn("%s: Invalid zoned device with non power of two zone size (%llu)\n",
495 				disk->disk_name, zone->len);
496 			return -ENODEV;
497 		}
498 
499 		args->zone_sectors = zone->len;
500 		args->nr_zones = (capacity + zone->len - 1) >> ilog2(zone->len);
501 	} else if (zone->start + args->zone_sectors < capacity) {
502 		if (zone->len != args->zone_sectors) {
503 			pr_warn("%s: Invalid zoned device with non constant zone size\n",
504 				disk->disk_name);
505 			return -ENODEV;
506 		}
507 	} else {
508 		if (zone->len > args->zone_sectors) {
509 			pr_warn("%s: Invalid zoned device with larger last zone size\n",
510 				disk->disk_name);
511 			return -ENODEV;
512 		}
513 	}
514 
515 	/* Check for holes in the zone report */
516 	if (zone->start != args->sector) {
517 		pr_warn("%s: Zone gap at sectors %llu..%llu\n",
518 			disk->disk_name, args->sector, zone->start);
519 		return -ENODEV;
520 	}
521 
522 	/* Check zone type */
523 	switch (zone->type) {
524 	case BLK_ZONE_TYPE_CONVENTIONAL:
525 		if (!args->conv_zones_bitmap) {
526 			args->conv_zones_bitmap =
527 				blk_alloc_zone_bitmap(q->node, args->nr_zones);
528 			if (!args->conv_zones_bitmap)
529 				return -ENOMEM;
530 		}
531 		set_bit(idx, args->conv_zones_bitmap);
532 		break;
533 	case BLK_ZONE_TYPE_SEQWRITE_REQ:
534 	case BLK_ZONE_TYPE_SEQWRITE_PREF:
535 		if (!args->seq_zones_wlock) {
536 			args->seq_zones_wlock =
537 				blk_alloc_zone_bitmap(q->node, args->nr_zones);
538 			if (!args->seq_zones_wlock)
539 				return -ENOMEM;
540 		}
541 		break;
542 	default:
543 		pr_warn("%s: Invalid zone type 0x%x at sectors %llu\n",
544 			disk->disk_name, (int)zone->type, zone->start);
545 		return -ENODEV;
546 	}
547 
548 	args->sector += zone->len;
549 	return 0;
550 }
551 
552 /**
553  * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
554  * @disk:	Target disk
555  * @update_driver_data:	Callback to update driver data on the frozen disk
556  *
557  * Helper function for low-level device drivers to (re) allocate and initialize
558  * a disk request queue zone bitmaps. This functions should normally be called
559  * within the disk ->revalidate method for blk-mq based drivers.  For BIO based
560  * drivers only q->nr_zones needs to be updated so that the sysfs exposed value
561  * is correct.
562  * If the @update_driver_data callback function is not NULL, the callback is
563  * executed with the device request queue frozen after all zones have been
564  * checked.
565  */
blk_revalidate_disk_zones(struct gendisk * disk,void (* update_driver_data)(struct gendisk * disk))566 int blk_revalidate_disk_zones(struct gendisk *disk,
567 			      void (*update_driver_data)(struct gendisk *disk))
568 {
569 	struct request_queue *q = disk->queue;
570 	struct blk_revalidate_zone_args args = {
571 		.disk		= disk,
572 	};
573 	unsigned int noio_flag;
574 	int ret;
575 
576 	if (WARN_ON_ONCE(!blk_queue_is_zoned(q)))
577 		return -EIO;
578 	if (WARN_ON_ONCE(!queue_is_mq(q)))
579 		return -EIO;
580 
581 	if (!get_capacity(disk))
582 		return -EIO;
583 
584 	/*
585 	 * Ensure that all memory allocations in this context are done as if
586 	 * GFP_NOIO was specified.
587 	 */
588 	noio_flag = memalloc_noio_save();
589 	ret = disk->fops->report_zones(disk, 0, UINT_MAX,
590 				       blk_revalidate_zone_cb, &args);
591 	if (!ret) {
592 		pr_warn("%s: No zones reported\n", disk->disk_name);
593 		ret = -ENODEV;
594 	}
595 	memalloc_noio_restore(noio_flag);
596 
597 	/*
598 	 * If zones where reported, make sure that the entire disk capacity
599 	 * has been checked.
600 	 */
601 	if (ret > 0 && args.sector != get_capacity(disk)) {
602 		pr_warn("%s: Missing zones from sector %llu\n",
603 			disk->disk_name, args.sector);
604 		ret = -ENODEV;
605 	}
606 
607 	/*
608 	 * Install the new bitmaps and update nr_zones only once the queue is
609 	 * stopped and all I/Os are completed (i.e. a scheduler is not
610 	 * referencing the bitmaps).
611 	 */
612 	blk_mq_freeze_queue(q);
613 	if (ret > 0) {
614 		blk_queue_chunk_sectors(q, args.zone_sectors);
615 		q->nr_zones = args.nr_zones;
616 		swap(q->seq_zones_wlock, args.seq_zones_wlock);
617 		swap(q->conv_zones_bitmap, args.conv_zones_bitmap);
618 		if (update_driver_data)
619 			update_driver_data(disk);
620 		ret = 0;
621 	} else {
622 		pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
623 		blk_queue_free_zone_bitmaps(q);
624 	}
625 	blk_mq_unfreeze_queue(q);
626 
627 	kfree(args.seq_zones_wlock);
628 	kfree(args.conv_zones_bitmap);
629 	return ret;
630 }
631 EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
632 
blk_queue_clear_zone_settings(struct request_queue * q)633 void blk_queue_clear_zone_settings(struct request_queue *q)
634 {
635 	blk_mq_freeze_queue(q);
636 
637 	blk_queue_free_zone_bitmaps(q);
638 	blk_queue_flag_clear(QUEUE_FLAG_ZONE_RESETALL, q);
639 	q->required_elevator_features &= ~ELEVATOR_F_ZBD_SEQ_WRITE;
640 	q->nr_zones = 0;
641 	q->max_open_zones = 0;
642 	q->max_active_zones = 0;
643 	q->limits.chunk_sectors = 0;
644 	q->limits.zone_write_granularity = 0;
645 	q->limits.max_zone_append_sectors = 0;
646 
647 	blk_mq_unfreeze_queue(q);
648 }
649