[linux-2.6-block.git] / block / blk-zoned.c

// SPDX-License-Identifier: GPL-2.0
/*
 * Zoned block device handling
 *
 * Copyright (c) 2015, Hannes Reinecke
 * Copyright (c) 2015, SUSE Linux GmbH
 *
 * Copyright (c) 2016, Damien Le Moal
 * Copyright (c) 2016, Western Digital
 */

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/rbtree.h>
#include <linux/blkdev.h>
#include <linux/blk-mq.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/sched/mm.h>

#include "blk.h"

static inline sector_t blk_zone_start(struct request_queue *q,
				      sector_t sector)
{
	sector_t zone_mask = blk_queue_zone_sectors(q) - 1;

	return sector & ~zone_mask;
}

/*
 * Return true if a request is a write requests that needs zone write locking.
 */
bool blk_req_needs_zone_write_lock(struct request *rq)
{
	if (!rq->q->seq_zones_wlock)
		return false;

	if (blk_rq_is_passthrough(rq))
		return false;

	switch (req_op(rq)) {
	case REQ_OP_WRITE_ZEROES:
	case REQ_OP_WRITE_SAME:
	case REQ_OP_WRITE:
		return blk_rq_zone_is_seq(rq);
	default:
		return false;
	}
}
EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);

void __blk_req_zone_write_lock(struct request *rq)
{
	if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
					  rq->q->seq_zones_wlock)))
		return;

	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
	rq->rq_flags |= RQF_ZONE_WRITE_LOCKED;
}
EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);

void __blk_req_zone_write_unlock(struct request *rq)
{
	rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
	if (rq->q->seq_zones_wlock)
		WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
						 rq->q->seq_zones_wlock));
}
EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);

static inline unsigned int __blkdev_nr_zones(struct request_queue *q,
					     sector_t nr_sectors)
{
	sector_t zone_sectors = blk_queue_zone_sectors(q);

	return (nr_sectors + zone_sectors - 1) >> ilog2(zone_sectors);
}

/**
 * blkdev_nr_zones - Get number of zones
 * @bdev:	Target block device
 *
 * Description:
 *    Return the total number of zones of a zoned block device.
 *    For a regular block device, the number of zones is always 0.
 */
unsigned int blkdev_nr_zones(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (!blk_queue_is_zoned(q))
		return 0;

	return __blkdev_nr_zones(q, bdev->bd_part->nr_sects);
}
EXPORT_SYMBOL_GPL(blkdev_nr_zones);

/*
 * Check that a zone report belongs to this partition, and if yes, fix its start
 * sector and write pointer and return true. Return false otherwise.
 */
static bool blkdev_report_zone(struct block_device *bdev, struct blk_zone *rep)
{
	sector_t offset = get_start_sect(bdev);

	if (rep->start < offset)
		return false;

	rep->start -= offset;
	if (rep->start + rep->len > bdev->bd_part->nr_sects)
		return false;

	if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL)
		rep->wp = rep->start + rep->len;
	else
		rep->wp -= offset;
	return true;
}

static int blk_report_zones(struct gendisk *disk, sector_t sector,
			    struct blk_zone *zones, unsigned int *nr_zones)
{
	struct request_queue *q = disk->queue;
	unsigned int z = 0, n, nrz = *nr_zones;
	sector_t capacity = get_capacity(disk);
	int ret;

	while (z < nrz && sector < capacity) {
		n = nrz - z;
		ret = disk->fops->report_zones(disk, sector, &zones[z], &n);
		if (ret)
			return ret;
		if (!n)
			break;
		sector += blk_queue_zone_sectors(q) * n;
		z += n;
	}

	WARN_ON(z > *nr_zones);
	*nr_zones = z;

	return 0;
}

/**
 * blkdev_report_zones - Get zones information
 * @bdev:	Target block device
 * @sector:	Sector from which to report zones
 * @zones:	Array of zone structures where to return the zones information
 * @nr_zones:	Number of zone structures in the zone array
 *
 * Description:
 *    Get zone information starting from the zone containing @sector.
 *    The number of zone information reported may be less than the number
 *    requested by @nr_zones. The number of zones actually reported is
 *    returned in @nr_zones.
 *    The caller must use memalloc_noXX_save/restore() calls to control
 *    memory allocations done within this function (zone array and command
 *    buffer allocation by the device driver).
 */
int blkdev_report_zones(struct block_device *bdev, sector_t sector,
			struct blk_zone *zones, unsigned int *nr_zones)
{
	struct request_queue *q = bdev_get_queue(bdev);
	unsigned int i, nrz;
	int ret;

	if (!blk_queue_is_zoned(q))
		return -EOPNOTSUPP;

	/*
	 * A block device that advertized itself as zoned must have a
	 * report_zones method. If it does not have one defined, the device
	 * driver has a bug. So warn about that.
	 */
	if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones))
		return -EOPNOTSUPP;

	if (!*nr_zones || sector >= bdev->bd_part->nr_sects) {
		*nr_zones = 0;
		return 0;
	}

	nrz = min(*nr_zones,
		  __blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector));
	ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector,
			       zones, &nrz);
	if (ret)
		return ret;

	for (i = 0; i < nrz; i++) {
		if (!blkdev_report_zone(bdev, zones))
			break;
		zones++;
	}

	*nr_zones = i;

	return 0;
}
EXPORT_SYMBOL_GPL(blkdev_report_zones);

/**
 * blkdev_reset_zones - Reset zones write pointer
 * @bdev:	Target block device
 * @sector:	Start sector of the first zone to reset
 * @nr_sectors:	Number of sectors, at least the length of one zone
 * @gfp_mask:	Memory allocation flags (for bio_alloc)
 *
 * Description:
 *    Reset the write pointer of the zones contained in the range
 *    @sector..@sector+@nr_sectors. Specifying the entire disk sector range
 *    is valid, but the specified range should not contain conventional zones.
 */
int blkdev_reset_zones(struct block_device *bdev,
		       sector_t sector, sector_t nr_sectors,
		       gfp_t gfp_mask)
{
	struct request_queue *q = bdev_get_queue(bdev);
	sector_t zone_sectors;
	sector_t end_sector = sector + nr_sectors;
	struct bio *bio = NULL;
	struct blk_plug plug;
	int ret;

	if (!blk_queue_is_zoned(q))
		return -EOPNOTSUPP;

	if (bdev_read_only(bdev))
		return -EPERM;

	if (!nr_sectors || end_sector > bdev->bd_part->nr_sects)
		/* Out of range */
		return -EINVAL;

	/* Check alignment (handle eventual smaller last zone) */
	zone_sectors = blk_queue_zone_sectors(q);
	if (sector & (zone_sectors - 1))
		return -EINVAL;

	if ((nr_sectors & (zone_sectors - 1)) &&
	    end_sector != bdev->bd_part->nr_sects)
		return -EINVAL;

	blk_start_plug(&plug);
	while (sector < end_sector) {

		bio = blk_next_bio(bio, 0, gfp_mask);
		bio->bi_iter.bi_sector = sector;
		bio_set_dev(bio, bdev);
		bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);

		sector += zone_sectors;

		/* This may take a while, so be nice to others */
		cond_resched();

	}

	ret = submit_bio_wait(bio);
	bio_put(bio);

	blk_finish_plug(&plug);

	return ret;
}
EXPORT_SYMBOL_GPL(blkdev_reset_zones);

/*
 * BLKREPORTZONE ioctl processing.
 * Called from blkdev_ioctl.
 */
int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
			      unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct request_queue *q;
	struct blk_zone_report rep;
	struct blk_zone *zones;
	int ret;

	if (!argp)
		return -EINVAL;

	q = bdev_get_queue(bdev);
	if (!q)
		return -ENXIO;

	if (!blk_queue_is_zoned(q))
		return -ENOTTY;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
		return -EFAULT;

	if (!rep.nr_zones)
		return -EINVAL;

	rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);

	zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
			       GFP_KERNEL | __GFP_ZERO);
	if (!zones)
		return -ENOMEM;

	ret = blkdev_report_zones(bdev, rep.sector, zones, &rep.nr_zones);
	if (ret)
		goto out;

	if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
		ret = -EFAULT;
		goto out;
	}

	if (rep.nr_zones) {
		if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
				 sizeof(struct blk_zone) * rep.nr_zones))
			ret = -EFAULT;
	}

 out:
	kvfree(zones);

	return ret;
}

/*
 * BLKRESETZONE ioctl processing.
 * Called from blkdev_ioctl.
 */
int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
			     unsigned int cmd, unsigned long arg)
{
	void __user *argp = (void __user *)arg;
	struct request_queue *q;
	struct blk_zone_range zrange;

	if (!argp)
		return -EINVAL;

	q = bdev_get_queue(bdev);
	if (!q)
		return -ENXIO;

	if (!blk_queue_is_zoned(q))
		return -ENOTTY;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (!(mode & FMODE_WRITE))
		return -EBADF;

	if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
		return -EFAULT;

	return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
				  GFP_KERNEL);
}

static inline unsigned long *blk_alloc_zone_bitmap(int node,
						   unsigned int nr_zones)
{
	return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
			    GFP_NOIO, node);
}

/*
 * Allocate an array of struct blk_zone to get nr_zones zone information.
 * The allocated array may be smaller than nr_zones.
 */
static struct blk_zone *blk_alloc_zones(unsigned int *nr_zones)
{
	struct blk_zone *zones;
	size_t nrz = min(*nr_zones, BLK_ZONED_REPORT_MAX_ZONES);

	/*
	 * GFP_KERNEL here is meaningless as the caller task context has
	 * the PF_MEMALLOC_NOIO flag set in blk_revalidate_disk_zones()
	 * with memalloc_noio_save().
	 */
	zones = kvcalloc(nrz, sizeof(struct blk_zone), GFP_KERNEL);
	if (!zones) {
		*nr_zones = 0;
		return NULL;
	}

	*nr_zones = nrz;

	return zones;
}

void blk_queue_free_zone_bitmaps(struct request_queue *q)
{
	kfree(q->seq_zones_bitmap);
	q->seq_zones_bitmap = NULL;
	kfree(q->seq_zones_wlock);
	q->seq_zones_wlock = NULL;
}

/**
 * blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
 * @disk:	Target disk
 *
 * Helper function for low-level device drivers to (re) allocate and initialize
 * a disk request queue zone bitmaps. This functions should normally be called
 * within the disk ->revalidate method. For BIO based queues, no zone bitmap
 * is allocated.
 */
int blk_revalidate_disk_zones(struct gendisk *disk)
{
	struct request_queue *q = disk->queue;
	unsigned int nr_zones = __blkdev_nr_zones(q, get_capacity(disk));
	unsigned long *seq_zones_wlock = NULL, *seq_zones_bitmap = NULL;
	unsigned int i, rep_nr_zones = 0, z = 0, nrz;
	struct blk_zone *zones = NULL;
	unsigned int noio_flag;
	sector_t sector = 0;
	int ret = 0;

	/*
	 * BIO based queues do not use a scheduler so only q->nr_zones
	 * needs to be updated so that the sysfs exposed value is correct.
	 */
	if (!queue_is_mq(q)) {
		q->nr_zones = nr_zones;
		return 0;
	}

	/*
	 * Ensure that all memory allocations in this context are done as
	 * if GFP_NOIO was specified.
	 */
	noio_flag = memalloc_noio_save();

	if (!blk_queue_is_zoned(q) || !nr_zones) {
		nr_zones = 0;
		goto update;
	}

	/* Allocate bitmaps */
	ret = -ENOMEM;
	seq_zones_wlock = blk_alloc_zone_bitmap(q->node, nr_zones);
	if (!seq_zones_wlock)
		goto out;
	seq_zones_bitmap = blk_alloc_zone_bitmap(q->node, nr_zones);
	if (!seq_zones_bitmap)
		goto out;

	/* Get zone information and initialize seq_zones_bitmap */
	rep_nr_zones = nr_zones;
	zones = blk_alloc_zones(&rep_nr_zones);
	if (!zones)
		goto out;

	while (z < nr_zones) {
		nrz = min(nr_zones - z, rep_nr_zones);
		ret = blk_report_zones(disk, sector, zones, &nrz);
		if (ret)
			goto out;
		if (!nrz)
			break;
		for (i = 0; i < nrz; i++) {
			if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
				set_bit(z, seq_zones_bitmap);
			z++;
		}
		sector += nrz * blk_queue_zone_sectors(q);
	}

	if (WARN_ON(z != nr_zones)) {
		ret = -EIO;
		goto out;
	}

update:
	/*
	 * Install the new bitmaps, making sure the queue is stopped and
	 * all I/Os are completed (i.e. a scheduler is not referencing the
	 * bitmaps).
	 */
	blk_mq_freeze_queue(q);
	q->nr_zones = nr_zones;
	swap(q->seq_zones_wlock, seq_zones_wlock);
	swap(q->seq_zones_bitmap, seq_zones_bitmap);
	blk_mq_unfreeze_queue(q);

out:
	memalloc_noio_restore(noio_flag);

	kvfree(zones);
	kfree(seq_zones_wlock);
	kfree(seq_zones_bitmap);

	if (ret) {
		pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
		blk_mq_freeze_queue(q);
		blk_queue_free_zone_bitmaps(q);
		blk_mq_unfreeze_queue(q);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
Commit	Line	Data
3dcf60bc	1	// SPDX-License-Identifier: GPL-2.0
6a0cb1bc HR	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>
bf505456	16	#include <linux/blk-mq.h>
26202928 DLM	17	#include <linux/mm.h>
26202928 DLM	18	#include <linux/vmalloc.h>
bd976e52	19	#include <linux/sched/mm.h>
6a0cb1bc	20
a2d6b3a2 DLM	21	#include "blk.h"
a2d6b3a2 DLM	22
6a0cb1bc HR	23	static inline sector_t blk_zone_start(struct request_queue *q,
	24	sector_t sector)
	25	{
f99e8648	26	sector_t zone_mask = blk_queue_zone_sectors(q) - 1;
6a0cb1bc HR	27
	28	return sector & ~zone_mask;
	29	}
	30
6cc77e9c CH	31	/*
	32	* Return true if a request is a write requests that needs zone write locking.
	33	*/
	34	bool blk_req_needs_zone_write_lock(struct request *rq)
	35	{
	36	if (!rq->q->seq_zones_wlock)
	37	return false;
	38
	39	if (blk_rq_is_passthrough(rq))
	40	return false;
	41
	42	switch (req_op(rq)) {
	43	case REQ_OP_WRITE_ZEROES:
	44	case REQ_OP_WRITE_SAME:
	45	case REQ_OP_WRITE:
	46	return blk_rq_zone_is_seq(rq);
	47	default:
	48	return false;
	49	}
	50	}
	51	EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
	52
	53	void __blk_req_zone_write_lock(struct request *rq)
	54	{
	55	if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
	56	rq->q->seq_zones_wlock)))
	57	return;
	58
	59	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
	60	rq->rq_flags \|= RQF_ZONE_WRITE_LOCKED;
	61	}
	62	EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);
	63
	64	void __blk_req_zone_write_unlock(struct request *rq)
	65	{
	66	rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
	67	if (rq->q->seq_zones_wlock)
	68	WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
	69	rq->q->seq_zones_wlock));
	70	}
	71	EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
	72
a91e1380 DLM	73	static inline unsigned int __blkdev_nr_zones(struct request_queue *q,
	74	sector_t nr_sectors)
	75	{
113ab72e	76	sector_t zone_sectors = blk_queue_zone_sectors(q);
a91e1380 DLM	77
	78	return (nr_sectors + zone_sectors - 1) >> ilog2(zone_sectors);
	79	}
	80
	81	/**
	82	* blkdev_nr_zones - Get number of zones
	83	* @bdev: Target block device
	84	*
	85	* Description:
	86	* Return the total number of zones of a zoned block device.
	87	* For a regular block device, the number of zones is always 0.
	88	*/
	89	unsigned int blkdev_nr_zones(struct block_device *bdev)
	90	{
	91	struct request_queue *q = bdev_get_queue(bdev);
	92
	93	if (!blk_queue_is_zoned(q))
	94	return 0;
	95
	96	return __blkdev_nr_zones(q, bdev->bd_part->nr_sects);
	97	}
	98	EXPORT_SYMBOL_GPL(blkdev_nr_zones);
	99
6a0cb1bc	100	/*
e76239a3 CH	101	* Check that a zone report belongs to this partition, and if yes, fix its start
e76239a3 CH	102	* sector and write pointer and return true. Return false otherwise.
6a0cb1bc	103	*/
e76239a3	104	static bool blkdev_report_zone(struct block_device bdev, struct blk_zone rep)
6a0cb1bc HR	105	{
	106	sector_t offset = get_start_sect(bdev);
	107
	108	if (rep->start < offset)
	109	return false;
	110
	111	rep->start -= offset;
	112	if (rep->start + rep->len > bdev->bd_part->nr_sects)
	113	return false;
	114
	115	if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL)
	116	rep->wp = rep->start + rep->len;
	117	else
	118	rep->wp -= offset;
6a0cb1bc HR	119	return true;
	120	}
	121
e76239a3	122	static int blk_report_zones(struct gendisk *disk, sector_t sector,
bd976e52	123	struct blk_zone zones, unsigned int nr_zones)
e76239a3 CH	124	{
	125	struct request_queue *q = disk->queue;
	126	unsigned int z = 0, n, nrz = *nr_zones;
	127	sector_t capacity = get_capacity(disk);
	128	int ret;
	129
	130	while (z < nrz && sector < capacity) {
	131	n = nrz - z;
bd976e52	132	ret = disk->fops->report_zones(disk, sector, &zones[z], &n);
e76239a3 CH	133	if (ret)
	134	return ret;
	135	if (!n)
	136	break;
	137	sector += blk_queue_zone_sectors(q) * n;
	138	z += n;
	139	}
	140
	141	WARN_ON(z > *nr_zones);
	142	*nr_zones = z;
	143
	144	return 0;
	145	}
	146
6a0cb1bc HR	147	/**
	148	* blkdev_report_zones - Get zones information
	149	* @bdev: Target block device
	150	* @sector: Sector from which to report zones
	151	* @zones: Array of zone structures where to return the zones information
	152	* @nr_zones: Number of zone structures in the zone array
6a0cb1bc HR	153	*
	154	* Description:
	155	* Get zone information starting from the zone containing @sector.
	156	* The number of zone information reported may be less than the number
	157	* requested by @nr_zones. The number of zones actually reported is
	158	* returned in @nr_zones.
bd976e52 DLM	159	* The caller must use memalloc_noXX_save/restore() calls to control
	160	* memory allocations done within this function (zone array and command
	161	* buffer allocation by the device driver).
6a0cb1bc	162	*/
e76239a3	163	int blkdev_report_zones(struct block_device *bdev, sector_t sector,
bd976e52	164	struct blk_zone zones, unsigned int nr_zones)
6a0cb1bc HR	165	{
6a0cb1bc HR	166	struct request_queue *q = bdev_get_queue(bdev);
e76239a3	167	unsigned int i, nrz;
3c4da758	168	int ret;
6a0cb1bc	169
6a0cb1bc HR	170	if (!blk_queue_is_zoned(q))
	171	return -EOPNOTSUPP;
	172
e76239a3 CH	173	/*
	174	* A block device that advertized itself as zoned must have a
	175	* report_zones method. If it does not have one defined, the device
	176	* driver has a bug. So warn about that.
	177	*/
	178	if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones))
	179	return -EOPNOTSUPP;
6a0cb1bc	180
e76239a3	181	if (!*nr_zones \|\| sector >= bdev->bd_part->nr_sects) {
6a0cb1bc HR	182	*nr_zones = 0;
	183	return 0;
	184	}
	185
e76239a3 CH	186	nrz = min(*nr_zones,
	187	__blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector));
	188	ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector,
bd976e52	189	zones, &nrz);
6a0cb1bc	190	if (ret)
e76239a3	191	return ret;
6a0cb1bc	192
e76239a3 CH	193	for (i = 0; i < nrz; i++) {
e76239a3 CH	194	if (!blkdev_report_zone(bdev, zones))
6a0cb1bc	195	break;
e76239a3	196	zones++;
6a0cb1bc HR	197	}
6a0cb1bc HR	198
e76239a3	199	*nr_zones = i;
6a0cb1bc	200
e76239a3	201	return 0;
6a0cb1bc HR	202	}
	203	EXPORT_SYMBOL_GPL(blkdev_report_zones);
	204
	205	/**
	206	* blkdev_reset_zones - Reset zones write pointer
	207	* @bdev: Target block device
	208	* @sector: Start sector of the first zone to reset
	209	* @nr_sectors: Number of sectors, at least the length of one zone
	210	* @gfp_mask: Memory allocation flags (for bio_alloc)
	211	*
	212	* Description:
	213	* Reset the write pointer of the zones contained in the range
	214	* @sector..@sector+@nr_sectors. Specifying the entire disk sector range
	215	* is valid, but the specified range should not contain conventional zones.
	216	*/
	217	int blkdev_reset_zones(struct block_device *bdev,
	218	sector_t sector, sector_t nr_sectors,
	219	gfp_t gfp_mask)
	220	{
	221	struct request_queue *q = bdev_get_queue(bdev);
	222	sector_t zone_sectors;
	223	sector_t end_sector = sector + nr_sectors;
a2d6b3a2 DLM	224	struct bio *bio = NULL;
a2d6b3a2 DLM	225	struct blk_plug plug;
6a0cb1bc HR	226	int ret;
6a0cb1bc HR	227
6a0cb1bc HR	228	if (!blk_queue_is_zoned(q))
	229	return -EOPNOTSUPP;
	230
a2d6b3a2 DLM	231	if (bdev_read_only(bdev))
	232	return -EPERM;
	233
	234	if (!nr_sectors \|\| end_sector > bdev->bd_part->nr_sects)
6a0cb1bc HR	235	/* Out of range */
	236	return -EINVAL;
	237
	238	/* Check alignment (handle eventual smaller last zone) */
f99e8648	239	zone_sectors = blk_queue_zone_sectors(q);
6a0cb1bc HR	240	if (sector & (zone_sectors - 1))
	241	return -EINVAL;
	242
	243	if ((nr_sectors & (zone_sectors - 1)) &&
	244	end_sector != bdev->bd_part->nr_sects)
	245	return -EINVAL;
	246
a2d6b3a2	247	blk_start_plug(&plug);
6a0cb1bc HR	248	while (sector < end_sector) {
6a0cb1bc HR	249
a2d6b3a2	250	bio = blk_next_bio(bio, 0, gfp_mask);
6a0cb1bc	251	bio->bi_iter.bi_sector = sector;
74d46992	252	bio_set_dev(bio, bdev);
6a0cb1bc HR	253	bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);
6a0cb1bc HR	254
6a0cb1bc HR	255	sector += zone_sectors;
	256
	257	/* This may take a while, so be nice to others */
	258	cond_resched();
	259
	260	}
	261
a2d6b3a2 DLM	262	ret = submit_bio_wait(bio);
	263	bio_put(bio);
	264
	265	blk_finish_plug(&plug);
	266
	267	return ret;
6a0cb1bc HR	268	}
6a0cb1bc HR	269	EXPORT_SYMBOL_GPL(blkdev_reset_zones);
3ed05a98	270
56c4bddb	271	/*
3ed05a98 ST	272	* BLKREPORTZONE ioctl processing.
	273	* Called from blkdev_ioctl.
	274	*/
	275	int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
	276	unsigned int cmd, unsigned long arg)
	277	{
	278	void __user argp = (void __user )arg;
	279	struct request_queue *q;
	280	struct blk_zone_report rep;
	281	struct blk_zone *zones;
	282	int ret;
	283
	284	if (!argp)
	285	return -EINVAL;
	286
	287	q = bdev_get_queue(bdev);
	288	if (!q)
	289	return -ENXIO;
	290
	291	if (!blk_queue_is_zoned(q))
	292	return -ENOTTY;
	293
	294	if (!capable(CAP_SYS_ADMIN))
	295	return -EACCES;
	296
	297	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
	298	return -EFAULT;
	299
	300	if (!rep.nr_zones)
	301	return -EINVAL;
	302
2e85fbaf	303	rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);
327ea4ad	304
344476e1 KC	305	zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
344476e1 KC	306	GFP_KERNEL \| __GFP_ZERO);
3ed05a98 ST	307	if (!zones)
	308	return -ENOMEM;
	309
bd976e52	310	ret = blkdev_report_zones(bdev, rep.sector, zones, &rep.nr_zones);
3ed05a98 ST	311	if (ret)
	312	goto out;
	313
	314	if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
	315	ret = -EFAULT;
	316	goto out;
	317	}
	318
	319	if (rep.nr_zones) {
	320	if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
	321	sizeof(struct blk_zone) * rep.nr_zones))
	322	ret = -EFAULT;
	323	}
	324
	325	out:
327ea4ad	326	kvfree(zones);
3ed05a98 ST	327
	328	return ret;
	329	}
	330
56c4bddb	331	/*
3ed05a98 ST	332	* BLKRESETZONE ioctl processing.
	333	* Called from blkdev_ioctl.
	334	*/
	335	int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
	336	unsigned int cmd, unsigned long arg)
	337	{
	338	void __user argp = (void __user )arg;
	339	struct request_queue *q;
	340	struct blk_zone_range zrange;
	341
	342	if (!argp)
	343	return -EINVAL;
	344
	345	q = bdev_get_queue(bdev);
	346	if (!q)
	347	return -ENXIO;
	348
	349	if (!blk_queue_is_zoned(q))
	350	return -ENOTTY;
	351
	352	if (!capable(CAP_SYS_ADMIN))
	353	return -EACCES;
	354
	355	if (!(mode & FMODE_WRITE))
	356	return -EBADF;
	357
	358	if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
	359	return -EFAULT;
	360
	361	return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
	362	GFP_KERNEL);
	363	}
bf505456 DLM	364
	365	static inline unsigned long *blk_alloc_zone_bitmap(int node,
	366	unsigned int nr_zones)
	367	{
	368	return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
	369	GFP_NOIO, node);
	370	}
	371
	372	/*
	373	* Allocate an array of struct blk_zone to get nr_zones zone information.
	374	* The allocated array may be smaller than nr_zones.
	375	*/
26202928	376	static struct blk_zone blk_alloc_zones(unsigned int nr_zones)
bf505456	377	{
26202928 DLM	378	struct blk_zone *zones;
	379	size_t nrz = min(*nr_zones, BLK_ZONED_REPORT_MAX_ZONES);
	380
	381	/*
	382	* GFP_KERNEL here is meaningless as the caller task context has
	383	* the PF_MEMALLOC_NOIO flag set in blk_revalidate_disk_zones()
	384	* with memalloc_noio_save().
	385	*/
	386	zones = kvcalloc(nrz, sizeof(struct blk_zone), GFP_KERNEL);
	387	if (!zones) {
	388	*nr_zones = 0;
	389	return NULL;
bf505456 DLM	390	}
bf505456 DLM	391
26202928 DLM	392	*nr_zones = nrz;
	393
	394	return zones;
bf505456 DLM	395	}
	396
	397	void blk_queue_free_zone_bitmaps(struct request_queue *q)
	398	{
	399	kfree(q->seq_zones_bitmap);
	400	q->seq_zones_bitmap = NULL;
	401	kfree(q->seq_zones_wlock);
	402	q->seq_zones_wlock = NULL;
	403	}
	404
	405	/**
	406	* blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
	407	* @disk: Target disk
	408	*
	409	* Helper function for low-level device drivers to (re) allocate and initialize
	410	* a disk request queue zone bitmaps. This functions should normally be called
	411	* within the disk ->revalidate method. For BIO based queues, no zone bitmap
	412	* is allocated.
	413	*/
	414	int blk_revalidate_disk_zones(struct gendisk *disk)
	415	{
	416	struct request_queue *q = disk->queue;
	417	unsigned int nr_zones = __blkdev_nr_zones(q, get_capacity(disk));
	418	unsigned long seq_zones_wlock = NULL, seq_zones_bitmap = NULL;
	419	unsigned int i, rep_nr_zones = 0, z = 0, nrz;
	420	struct blk_zone *zones = NULL;
bd976e52	421	unsigned int noio_flag;
bf505456 DLM	422	sector_t sector = 0;
	423	int ret = 0;
	424
	425	/*
	426	* BIO based queues do not use a scheduler so only q->nr_zones
	427	* needs to be updated so that the sysfs exposed value is correct.
	428	*/
344e9ffc	429	if (!queue_is_mq(q)) {
bf505456 DLM	430	q->nr_zones = nr_zones;
	431	return 0;
	432	}
	433
bd976e52 DLM	434	/*
	435	* Ensure that all memory allocations in this context are done as
	436	* if GFP_NOIO was specified.
	437	*/
	438	noio_flag = memalloc_noio_save();
	439
bf505456 DLM	440	if (!blk_queue_is_zoned(q) \|\| !nr_zones) {
	441	nr_zones = 0;
	442	goto update;
	443	}
	444
	445	/* Allocate bitmaps */
	446	ret = -ENOMEM;
	447	seq_zones_wlock = blk_alloc_zone_bitmap(q->node, nr_zones);
	448	if (!seq_zones_wlock)
	449	goto out;
	450	seq_zones_bitmap = blk_alloc_zone_bitmap(q->node, nr_zones);
	451	if (!seq_zones_bitmap)
	452	goto out;
	453
	454	/* Get zone information and initialize seq_zones_bitmap */
	455	rep_nr_zones = nr_zones;
26202928	456	zones = blk_alloc_zones(&rep_nr_zones);
bf505456 DLM	457	if (!zones)
	458	goto out;
	459
	460	while (z < nr_zones) {
	461	nrz = min(nr_zones - z, rep_nr_zones);
bd976e52	462	ret = blk_report_zones(disk, sector, zones, &nrz);
bf505456 DLM	463	if (ret)
	464	goto out;
	465	if (!nrz)
	466	break;
	467	for (i = 0; i < nrz; i++) {
	468	if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
	469	set_bit(z, seq_zones_bitmap);
	470	z++;
	471	}
	472	sector += nrz * blk_queue_zone_sectors(q);
	473	}
	474
	475	if (WARN_ON(z != nr_zones)) {
	476	ret = -EIO;
	477	goto out;
	478	}
	479
	480	update:
	481	/*
	482	* Install the new bitmaps, making sure the queue is stopped and
	483	* all I/Os are completed (i.e. a scheduler is not referencing the
	484	* bitmaps).
	485	*/
	486	blk_mq_freeze_queue(q);
	487	q->nr_zones = nr_zones;
	488	swap(q->seq_zones_wlock, seq_zones_wlock);
	489	swap(q->seq_zones_bitmap, seq_zones_bitmap);
	490	blk_mq_unfreeze_queue(q);
	491
	492	out:
bd976e52 DLM	493	memalloc_noio_restore(noio_flag);
bd976e52 DLM	494
26202928	495	kvfree(zones);
bf505456 DLM	496	kfree(seq_zones_wlock);
	497	kfree(seq_zones_bitmap);
	498
	499	if (ret) {
	500	pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
	501	blk_mq_freeze_queue(q);
	502	blk_queue_free_zone_bitmaps(q);
	503	blk_mq_unfreeze_queue(q);
	504	}
	505
	506	return ret;
	507	}
	508	EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
	509