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

/*
 * 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 "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)
{
	unsigned long 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,
			    gfp_t gfp_mask)
{
	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,
					       gfp_mask);
		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
 * @gfp_mask:	Memory allocation flags (for bio_alloc)
 *
 * 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.
 */
int blkdev_report_zones(struct block_device *bdev, sector_t sector,
			struct blk_zone *zones, unsigned int *nr_zones,
			gfp_t gfp_mask)
{
	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, gfp_mask);
	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,
				  GFP_KERNEL);
	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(int node, unsigned int *nr_zones)
{
	size_t size = *nr_zones * sizeof(struct blk_zone);
	struct page *page;
	int order;

	for (order = get_order(size); order >= 0; order--) {
		page = alloc_pages_node(node, GFP_NOIO | __GFP_ZERO, order);
		if (page) {
			*nr_zones = min_t(unsigned int, *nr_zones,
				(PAGE_SIZE << order) / sizeof(struct blk_zone));
			return page_address(page);
		}
	}

	return NULL;
}

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;
	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;
	}

	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(q->node, &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, GFP_NOIO);
		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:
	free_pages((unsigned long)zones,
		   get_order(rep_nr_zones * sizeof(struct blk_zone)));
	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
6a0cb1bc HR	1	/*
	2	* Zoned block device handling
	3	*
	4	* Copyright (c) 2015, Hannes Reinecke
	5	* Copyright (c) 2015, SUSE Linux GmbH
	6	*
	7	* Copyright (c) 2016, Damien Le Moal
	8	* Copyright (c) 2016, Western Digital
	9	*/
	10
	11	#include <linux/kernel.h>
	12	#include <linux/module.h>
	13	#include <linux/rbtree.h>
	14	#include <linux/blkdev.h>
bf505456	15	#include <linux/blk-mq.h>
6a0cb1bc	16
a2d6b3a2 DLM	17	#include "blk.h"
a2d6b3a2 DLM	18
6a0cb1bc HR	19	static inline sector_t blk_zone_start(struct request_queue *q,
	20	sector_t sector)
	21	{
f99e8648	22	sector_t zone_mask = blk_queue_zone_sectors(q) - 1;
6a0cb1bc HR	23
	24	return sector & ~zone_mask;
	25	}
	26
6cc77e9c CH	27	/*
	28	* Return true if a request is a write requests that needs zone write locking.
	29	*/
	30	bool blk_req_needs_zone_write_lock(struct request *rq)
	31	{
	32	if (!rq->q->seq_zones_wlock)
	33	return false;
	34
	35	if (blk_rq_is_passthrough(rq))
	36	return false;
	37
	38	switch (req_op(rq)) {
	39	case REQ_OP_WRITE_ZEROES:
	40	case REQ_OP_WRITE_SAME:
	41	case REQ_OP_WRITE:
	42	return blk_rq_zone_is_seq(rq);
	43	default:
	44	return false;
	45	}
	46	}
	47	EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
	48
	49	void __blk_req_zone_write_lock(struct request *rq)
	50	{
	51	if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
	52	rq->q->seq_zones_wlock)))
	53	return;
	54
	55	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
	56	rq->rq_flags \|= RQF_ZONE_WRITE_LOCKED;
	57	}
	58	EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);
	59
	60	void __blk_req_zone_write_unlock(struct request *rq)
	61	{
	62	rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
	63	if (rq->q->seq_zones_wlock)
	64	WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
	65	rq->q->seq_zones_wlock));
	66	}
	67	EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
	68
a91e1380 DLM	69	static inline unsigned int __blkdev_nr_zones(struct request_queue *q,
	70	sector_t nr_sectors)
	71	{
	72	unsigned long zone_sectors = blk_queue_zone_sectors(q);
	73
	74	return (nr_sectors + zone_sectors - 1) >> ilog2(zone_sectors);
	75	}
	76
	77	/**
	78	* blkdev_nr_zones - Get number of zones
	79	* @bdev: Target block device
	80	*
	81	* Description:
	82	* Return the total number of zones of a zoned block device.
	83	* For a regular block device, the number of zones is always 0.
	84	*/
	85	unsigned int blkdev_nr_zones(struct block_device *bdev)
	86	{
	87	struct request_queue *q = bdev_get_queue(bdev);
	88
	89	if (!blk_queue_is_zoned(q))
	90	return 0;
	91
	92	return __blkdev_nr_zones(q, bdev->bd_part->nr_sects);
	93	}
	94	EXPORT_SYMBOL_GPL(blkdev_nr_zones);
	95
6a0cb1bc	96	/*
e76239a3 CH	97	* Check that a zone report belongs to this partition, and if yes, fix its start
e76239a3 CH	98	* sector and write pointer and return true. Return false otherwise.
6a0cb1bc	99	*/
e76239a3	100	static bool blkdev_report_zone(struct block_device bdev, struct blk_zone rep)
6a0cb1bc HR	101	{
	102	sector_t offset = get_start_sect(bdev);
	103
	104	if (rep->start < offset)
	105	return false;
	106
	107	rep->start -= offset;
	108	if (rep->start + rep->len > bdev->bd_part->nr_sects)
	109	return false;
	110
	111	if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL)
	112	rep->wp = rep->start + rep->len;
	113	else
	114	rep->wp -= offset;
6a0cb1bc HR	115	return true;
	116	}
	117
e76239a3 CH	118	static int blk_report_zones(struct gendisk *disk, sector_t sector,
	119	struct blk_zone zones, unsigned int nr_zones,
	120	gfp_t gfp_mask)
	121	{
	122	struct request_queue *q = disk->queue;
	123	unsigned int z = 0, n, nrz = *nr_zones;
	124	sector_t capacity = get_capacity(disk);
	125	int ret;
	126
	127	while (z < nrz && sector < capacity) {
	128	n = nrz - z;
	129	ret = disk->fops->report_zones(disk, sector, &zones[z], &n,
	130	gfp_mask);
	131	if (ret)
	132	return ret;
	133	if (!n)
	134	break;
	135	sector += blk_queue_zone_sectors(q) * n;
	136	z += n;
	137	}
	138
	139	WARN_ON(z > *nr_zones);
	140	*nr_zones = z;
	141
	142	return 0;
	143	}
	144
6a0cb1bc HR	145	/**
	146	* blkdev_report_zones - Get zones information
	147	* @bdev: Target block device
	148	* @sector: Sector from which to report zones
	149	* @zones: Array of zone structures where to return the zones information
	150	* @nr_zones: Number of zone structures in the zone array
	151	* @gfp_mask: Memory allocation flags (for bio_alloc)
	152	*
	153	* Description:
	154	* Get zone information starting from the zone containing @sector.
	155	* The number of zone information reported may be less than the number
	156	* requested by @nr_zones. The number of zones actually reported is
	157	* returned in @nr_zones.
	158	*/
e76239a3 CH	159	int blkdev_report_zones(struct block_device *bdev, sector_t sector,
e76239a3 CH	160	struct blk_zone zones, unsigned int nr_zones,
6a0cb1bc HR	161	gfp_t gfp_mask)
	162	{
	163	struct request_queue *q = bdev_get_queue(bdev);
e76239a3	164	unsigned int i, nrz;
3c4da758	165	int ret;
6a0cb1bc	166
6a0cb1bc HR	167	if (!blk_queue_is_zoned(q))
	168	return -EOPNOTSUPP;
	169
e76239a3 CH	170	/*
	171	* A block device that advertized itself as zoned must have a
	172	* report_zones method. If it does not have one defined, the device
	173	* driver has a bug. So warn about that.
	174	*/
	175	if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones))
	176	return -EOPNOTSUPP;
6a0cb1bc	177
e76239a3	178	if (!*nr_zones \|\| sector >= bdev->bd_part->nr_sects) {
6a0cb1bc HR	179	*nr_zones = 0;
	180	return 0;
	181	}
	182
e76239a3 CH	183	nrz = min(*nr_zones,
	184	__blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector));
	185	ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector,
	186	zones, &nrz, gfp_mask);
6a0cb1bc	187	if (ret)
e76239a3	188	return ret;
6a0cb1bc	189
e76239a3 CH	190	for (i = 0; i < nrz; i++) {
e76239a3 CH	191	if (!blkdev_report_zone(bdev, zones))
6a0cb1bc	192	break;
e76239a3	193	zones++;
6a0cb1bc HR	194	}
6a0cb1bc HR	195
e76239a3	196	*nr_zones = i;
6a0cb1bc	197
e76239a3	198	return 0;
6a0cb1bc HR	199	}
	200	EXPORT_SYMBOL_GPL(blkdev_report_zones);
	201
	202	/**
	203	* blkdev_reset_zones - Reset zones write pointer
	204	* @bdev: Target block device
	205	* @sector: Start sector of the first zone to reset
	206	* @nr_sectors: Number of sectors, at least the length of one zone
	207	* @gfp_mask: Memory allocation flags (for bio_alloc)
	208	*
	209	* Description:
	210	* Reset the write pointer of the zones contained in the range
	211	* @sector..@sector+@nr_sectors. Specifying the entire disk sector range
	212	* is valid, but the specified range should not contain conventional zones.
	213	*/
	214	int blkdev_reset_zones(struct block_device *bdev,
	215	sector_t sector, sector_t nr_sectors,
	216	gfp_t gfp_mask)
	217	{
	218	struct request_queue *q = bdev_get_queue(bdev);
	219	sector_t zone_sectors;
	220	sector_t end_sector = sector + nr_sectors;
a2d6b3a2 DLM	221	struct bio *bio = NULL;
a2d6b3a2 DLM	222	struct blk_plug plug;
6a0cb1bc HR	223	int ret;
6a0cb1bc HR	224
6a0cb1bc HR	225	if (!blk_queue_is_zoned(q))
	226	return -EOPNOTSUPP;
	227
a2d6b3a2 DLM	228	if (bdev_read_only(bdev))
	229	return -EPERM;
	230
	231	if (!nr_sectors \|\| end_sector > bdev->bd_part->nr_sects)
6a0cb1bc HR	232	/* Out of range */
	233	return -EINVAL;
	234
	235	/* Check alignment (handle eventual smaller last zone) */
f99e8648	236	zone_sectors = blk_queue_zone_sectors(q);
6a0cb1bc HR	237	if (sector & (zone_sectors - 1))
	238	return -EINVAL;
	239
	240	if ((nr_sectors & (zone_sectors - 1)) &&
	241	end_sector != bdev->bd_part->nr_sects)
	242	return -EINVAL;
	243
a2d6b3a2	244	blk_start_plug(&plug);
6a0cb1bc HR	245	while (sector < end_sector) {
6a0cb1bc HR	246
a2d6b3a2	247	bio = blk_next_bio(bio, 0, gfp_mask);
6a0cb1bc	248	bio->bi_iter.bi_sector = sector;
74d46992	249	bio_set_dev(bio, bdev);
6a0cb1bc HR	250	bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);
6a0cb1bc HR	251
6a0cb1bc HR	252	sector += zone_sectors;
	253
	254	/* This may take a while, so be nice to others */
	255	cond_resched();
	256
	257	}
	258
a2d6b3a2 DLM	259	ret = submit_bio_wait(bio);
	260	bio_put(bio);
	261
	262	blk_finish_plug(&plug);
	263
	264	return ret;
6a0cb1bc HR	265	}
6a0cb1bc HR	266	EXPORT_SYMBOL_GPL(blkdev_reset_zones);
3ed05a98	267
56c4bddb	268	/*
3ed05a98 ST	269	* BLKREPORTZONE ioctl processing.
	270	* Called from blkdev_ioctl.
	271	*/
	272	int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
	273	unsigned int cmd, unsigned long arg)
	274	{
	275	void __user argp = (void __user )arg;
	276	struct request_queue *q;
	277	struct blk_zone_report rep;
	278	struct blk_zone *zones;
	279	int ret;
	280
	281	if (!argp)
	282	return -EINVAL;
	283
	284	q = bdev_get_queue(bdev);
	285	if (!q)
	286	return -ENXIO;
	287
	288	if (!blk_queue_is_zoned(q))
	289	return -ENOTTY;
	290
	291	if (!capable(CAP_SYS_ADMIN))
	292	return -EACCES;
	293
	294	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
	295	return -EFAULT;
	296
	297	if (!rep.nr_zones)
	298	return -EINVAL;
	299
2e85fbaf	300	rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);
327ea4ad	301
344476e1 KC	302	zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
344476e1 KC	303	GFP_KERNEL \| __GFP_ZERO);
3ed05a98 ST	304	if (!zones)
	305	return -ENOMEM;
	306
	307	ret = blkdev_report_zones(bdev, rep.sector,
	308	zones, &rep.nr_zones,
	309	GFP_KERNEL);
	310	if (ret)
	311	goto out;
	312
	313	if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
	314	ret = -EFAULT;
	315	goto out;
	316	}
	317
	318	if (rep.nr_zones) {
	319	if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
	320	sizeof(struct blk_zone) * rep.nr_zones))
	321	ret = -EFAULT;
	322	}
	323
	324	out:
327ea4ad	325	kvfree(zones);
3ed05a98 ST	326
	327	return ret;
	328	}
	329
56c4bddb	330	/*
3ed05a98 ST	331	* BLKRESETZONE ioctl processing.
	332	* Called from blkdev_ioctl.
	333	*/
	334	int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
	335	unsigned int cmd, unsigned long arg)
	336	{
	337	void __user argp = (void __user )arg;
	338	struct request_queue *q;
	339	struct blk_zone_range zrange;
	340
	341	if (!argp)
	342	return -EINVAL;
	343
	344	q = bdev_get_queue(bdev);
	345	if (!q)
	346	return -ENXIO;
	347
	348	if (!blk_queue_is_zoned(q))
	349	return -ENOTTY;
	350
	351	if (!capable(CAP_SYS_ADMIN))
	352	return -EACCES;
	353
	354	if (!(mode & FMODE_WRITE))
	355	return -EBADF;
	356
	357	if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
	358	return -EFAULT;
	359
	360	return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
	361	GFP_KERNEL);
	362	}
bf505456 DLM	363
	364	static inline unsigned long *blk_alloc_zone_bitmap(int node,
	365	unsigned int nr_zones)
	366	{
	367	return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
	368	GFP_NOIO, node);
	369	}
	370
	371	/*
	372	* Allocate an array of struct blk_zone to get nr_zones zone information.
	373	* The allocated array may be smaller than nr_zones.
	374	*/
	375	static struct blk_zone blk_alloc_zones(int node, unsigned int nr_zones)
	376	{
	377	size_t size = nr_zones sizeof(struct blk_zone);
	378	struct page *page;
	379	int order;
	380
927b6b2d	381	for (order = get_order(size); order >= 0; order--) {
bf505456 DLM	382	page = alloc_pages_node(node, GFP_NOIO \| __GFP_ZERO, order);
	383	if (page) {
	384	nr_zones = min_t(unsigned int, nr_zones,
	385	(PAGE_SIZE << order) / sizeof(struct blk_zone));
	386	return page_address(page);
	387	}
	388	}
	389
	390	return NULL;
	391	}
	392
	393	void blk_queue_free_zone_bitmaps(struct request_queue *q)
	394	{
	395	kfree(q->seq_zones_bitmap);
	396	q->seq_zones_bitmap = NULL;
	397	kfree(q->seq_zones_wlock);
	398	q->seq_zones_wlock = NULL;
	399	}
	400
	401	/**
	402	* blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
	403	* @disk: Target disk
	404	*
	405	* Helper function for low-level device drivers to (re) allocate and initialize
	406	* a disk request queue zone bitmaps. This functions should normally be called
	407	* within the disk ->revalidate method. For BIO based queues, no zone bitmap
	408	* is allocated.
	409	*/
	410	int blk_revalidate_disk_zones(struct gendisk *disk)
	411	{
	412	struct request_queue *q = disk->queue;
	413	unsigned int nr_zones = __blkdev_nr_zones(q, get_capacity(disk));
	414	unsigned long seq_zones_wlock = NULL, seq_zones_bitmap = NULL;
	415	unsigned int i, rep_nr_zones = 0, z = 0, nrz;
	416	struct blk_zone *zones = NULL;
	417	sector_t sector = 0;
	418	int ret = 0;
	419
	420	/*
	421	* BIO based queues do not use a scheduler so only q->nr_zones
	422	* needs to be updated so that the sysfs exposed value is correct.
	423	*/
344e9ffc	424	if (!queue_is_mq(q)) {
bf505456 DLM	425	q->nr_zones = nr_zones;
	426	return 0;
	427	}
	428
	429	if (!blk_queue_is_zoned(q) \|\| !nr_zones) {
	430	nr_zones = 0;
	431	goto update;
	432	}
	433
	434	/* Allocate bitmaps */
	435	ret = -ENOMEM;
	436	seq_zones_wlock = blk_alloc_zone_bitmap(q->node, nr_zones);
	437	if (!seq_zones_wlock)
	438	goto out;
	439	seq_zones_bitmap = blk_alloc_zone_bitmap(q->node, nr_zones);
	440	if (!seq_zones_bitmap)
	441	goto out;
	442
	443	/* Get zone information and initialize seq_zones_bitmap */
	444	rep_nr_zones = nr_zones;
	445	zones = blk_alloc_zones(q->node, &rep_nr_zones);
	446	if (!zones)
	447	goto out;
	448
	449	while (z < nr_zones) {
	450	nrz = min(nr_zones - z, rep_nr_zones);
	451	ret = blk_report_zones(disk, sector, zones, &nrz, GFP_NOIO);
	452	if (ret)
	453	goto out;
	454	if (!nrz)
	455	break;
	456	for (i = 0; i < nrz; i++) {
	457	if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
	458	set_bit(z, seq_zones_bitmap);
	459	z++;
	460	}
	461	sector += nrz * blk_queue_zone_sectors(q);
	462	}
	463
	464	if (WARN_ON(z != nr_zones)) {
	465	ret = -EIO;
	466	goto out;
	467	}
	468
	469	update:
	470	/*
	471	* Install the new bitmaps, making sure the queue is stopped and
	472	* all I/Os are completed (i.e. a scheduler is not referencing the
	473	* bitmaps).
	474	*/
	475	blk_mq_freeze_queue(q);
	476	q->nr_zones = nr_zones;
	477	swap(q->seq_zones_wlock, seq_zones_wlock);
	478	swap(q->seq_zones_bitmap, seq_zones_bitmap);
	479	blk_mq_unfreeze_queue(q);
	480
	481	out:
	482	free_pages((unsigned long)zones,
	483	get_order(rep_nr_zones * sizeof(struct blk_zone)));
	484	kfree(seq_zones_wlock);
	485	kfree(seq_zones_bitmap);
	486
	487	if (ret) {
	488	pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
489	blk_mq_freeze_queue(q);
490	blk_queue_free_zone_bitmaps(q);
491	blk_mq_unfreeze_queue(q);
492	}
493
494	return ret;
495	}
496	EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
497