[linux-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/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(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;
	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(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);
		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);

	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
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>
bd976e52	17	#include <linux/sched/mm.h>
6a0cb1bc	18
a2d6b3a2 DLM	19	#include "blk.h"
a2d6b3a2 DLM	20
6a0cb1bc HR	21	static inline sector_t blk_zone_start(struct request_queue *q,
	22	sector_t sector)
	23	{
f99e8648	24	sector_t zone_mask = blk_queue_zone_sectors(q) - 1;
6a0cb1bc HR	25
	26	return sector & ~zone_mask;
	27	}
	28
6cc77e9c CH	29	/*
	30	* Return true if a request is a write requests that needs zone write locking.
	31	*/
	32	bool blk_req_needs_zone_write_lock(struct request *rq)
	33	{
	34	if (!rq->q->seq_zones_wlock)
	35	return false;
	36
	37	if (blk_rq_is_passthrough(rq))
	38	return false;
	39
	40	switch (req_op(rq)) {
	41	case REQ_OP_WRITE_ZEROES:
	42	case REQ_OP_WRITE_SAME:
	43	case REQ_OP_WRITE:
	44	return blk_rq_zone_is_seq(rq);
	45	default:
	46	return false;
	47	}
	48	}
	49	EXPORT_SYMBOL_GPL(blk_req_needs_zone_write_lock);
	50
	51	void __blk_req_zone_write_lock(struct request *rq)
	52	{
	53	if (WARN_ON_ONCE(test_and_set_bit(blk_rq_zone_no(rq),
	54	rq->q->seq_zones_wlock)))
	55	return;
	56
	57	WARN_ON_ONCE(rq->rq_flags & RQF_ZONE_WRITE_LOCKED);
	58	rq->rq_flags \|= RQF_ZONE_WRITE_LOCKED;
	59	}
	60	EXPORT_SYMBOL_GPL(__blk_req_zone_write_lock);
	61
	62	void __blk_req_zone_write_unlock(struct request *rq)
	63	{
	64	rq->rq_flags &= ~RQF_ZONE_WRITE_LOCKED;
	65	if (rq->q->seq_zones_wlock)
	66	WARN_ON_ONCE(!test_and_clear_bit(blk_rq_zone_no(rq),
	67	rq->q->seq_zones_wlock));
	68	}
	69	EXPORT_SYMBOL_GPL(__blk_req_zone_write_unlock);
	70
a91e1380 DLM	71	static inline unsigned int __blkdev_nr_zones(struct request_queue *q,
	72	sector_t nr_sectors)
	73	{
113ab72e	74	sector_t zone_sectors = blk_queue_zone_sectors(q);
a91e1380 DLM	75
	76	return (nr_sectors + zone_sectors - 1) >> ilog2(zone_sectors);
	77	}
	78
	79	/**
	80	* blkdev_nr_zones - Get number of zones
	81	* @bdev: Target block device
	82	*
	83	* Description:
	84	* Return the total number of zones of a zoned block device.
	85	* For a regular block device, the number of zones is always 0.
	86	*/
	87	unsigned int blkdev_nr_zones(struct block_device *bdev)
	88	{
	89	struct request_queue *q = bdev_get_queue(bdev);
	90
	91	if (!blk_queue_is_zoned(q))
	92	return 0;
	93
	94	return __blkdev_nr_zones(q, bdev->bd_part->nr_sects);
	95	}
	96	EXPORT_SYMBOL_GPL(blkdev_nr_zones);
	97
6a0cb1bc	98	/*
e76239a3 CH	99	* Check that a zone report belongs to this partition, and if yes, fix its start
e76239a3 CH	100	* sector and write pointer and return true. Return false otherwise.
6a0cb1bc	101	*/
e76239a3	102	static bool blkdev_report_zone(struct block_device bdev, struct blk_zone rep)
6a0cb1bc HR	103	{
	104	sector_t offset = get_start_sect(bdev);
	105
	106	if (rep->start < offset)
	107	return false;
	108
	109	rep->start -= offset;
	110	if (rep->start + rep->len > bdev->bd_part->nr_sects)
	111	return false;
	112
	113	if (rep->type == BLK_ZONE_TYPE_CONVENTIONAL)
	114	rep->wp = rep->start + rep->len;
	115	else
	116	rep->wp -= offset;
6a0cb1bc HR	117	return true;
	118	}
	119
e76239a3	120	static int blk_report_zones(struct gendisk *disk, sector_t sector,
bd976e52	121	struct blk_zone zones, unsigned int nr_zones)
e76239a3 CH	122	{
	123	struct request_queue *q = disk->queue;
	124	unsigned int z = 0, n, nrz = *nr_zones;
	125	sector_t capacity = get_capacity(disk);
	126	int ret;
	127
	128	while (z < nrz && sector < capacity) {
	129	n = nrz - z;
bd976e52	130	ret = disk->fops->report_zones(disk, sector, &zones[z], &n);
e76239a3 CH	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
6a0cb1bc HR	151	*
	152	* Description:
	153	* Get zone information starting from the zone containing @sector.
	154	* The number of zone information reported may be less than the number
	155	* requested by @nr_zones. The number of zones actually reported is
	156	* returned in @nr_zones.
bd976e52 DLM	157	* The caller must use memalloc_noXX_save/restore() calls to control
	158	* memory allocations done within this function (zone array and command
	159	* buffer allocation by the device driver).
6a0cb1bc	160	*/
e76239a3	161	int blkdev_report_zones(struct block_device *bdev, sector_t sector,
bd976e52	162	struct blk_zone zones, unsigned int nr_zones)
6a0cb1bc HR	163	{
6a0cb1bc HR	164	struct request_queue *q = bdev_get_queue(bdev);
e76239a3	165	unsigned int i, nrz;
3c4da758	166	int ret;
6a0cb1bc	167
6a0cb1bc HR	168	if (!blk_queue_is_zoned(q))
	169	return -EOPNOTSUPP;
	170
e76239a3 CH	171	/*
	172	* A block device that advertized itself as zoned must have a
	173	* report_zones method. If it does not have one defined, the device
	174	* driver has a bug. So warn about that.
	175	*/
	176	if (WARN_ON_ONCE(!bdev->bd_disk->fops->report_zones))
	177	return -EOPNOTSUPP;
6a0cb1bc	178
e76239a3	179	if (!*nr_zones \|\| sector >= bdev->bd_part->nr_sects) {
6a0cb1bc HR	180	*nr_zones = 0;
	181	return 0;
	182	}
	183
e76239a3 CH	184	nrz = min(*nr_zones,
	185	__blkdev_nr_zones(q, bdev->bd_part->nr_sects - sector));
	186	ret = blk_report_zones(bdev->bd_disk, get_start_sect(bdev) + sector,
bd976e52	187	zones, &nrz);
6a0cb1bc	188	if (ret)
e76239a3	189	return ret;
6a0cb1bc	190
e76239a3 CH	191	for (i = 0; i < nrz; i++) {
e76239a3 CH	192	if (!blkdev_report_zone(bdev, zones))
6a0cb1bc	193	break;
e76239a3	194	zones++;
6a0cb1bc HR	195	}
6a0cb1bc HR	196
e76239a3	197	*nr_zones = i;
6a0cb1bc	198
e76239a3	199	return 0;
6a0cb1bc HR	200	}
	201	EXPORT_SYMBOL_GPL(blkdev_report_zones);
	202
	203	/**
	204	* blkdev_reset_zones - Reset zones write pointer
	205	* @bdev: Target block device
	206	* @sector: Start sector of the first zone to reset
	207	* @nr_sectors: Number of sectors, at least the length of one zone
	208	* @gfp_mask: Memory allocation flags (for bio_alloc)
	209	*
	210	* Description:
	211	* Reset the write pointer of the zones contained in the range
	212	* @sector..@sector+@nr_sectors. Specifying the entire disk sector range
	213	* is valid, but the specified range should not contain conventional zones.
	214	*/
	215	int blkdev_reset_zones(struct block_device *bdev,
	216	sector_t sector, sector_t nr_sectors,
	217	gfp_t gfp_mask)
	218	{
	219	struct request_queue *q = bdev_get_queue(bdev);
	220	sector_t zone_sectors;
	221	sector_t end_sector = sector + nr_sectors;
a2d6b3a2 DLM	222	struct bio *bio = NULL;
a2d6b3a2 DLM	223	struct blk_plug plug;
6a0cb1bc HR	224	int ret;
6a0cb1bc HR	225
6a0cb1bc HR	226	if (!blk_queue_is_zoned(q))
	227	return -EOPNOTSUPP;
	228
a2d6b3a2 DLM	229	if (bdev_read_only(bdev))
	230	return -EPERM;
	231
	232	if (!nr_sectors \|\| end_sector > bdev->bd_part->nr_sects)
6a0cb1bc HR	233	/* Out of range */
	234	return -EINVAL;
	235
	236	/* Check alignment (handle eventual smaller last zone) */
f99e8648	237	zone_sectors = blk_queue_zone_sectors(q);
6a0cb1bc HR	238	if (sector & (zone_sectors - 1))
	239	return -EINVAL;
	240
	241	if ((nr_sectors & (zone_sectors - 1)) &&
	242	end_sector != bdev->bd_part->nr_sects)
	243	return -EINVAL;
	244
a2d6b3a2	245	blk_start_plug(&plug);
6a0cb1bc HR	246	while (sector < end_sector) {
6a0cb1bc HR	247
a2d6b3a2	248	bio = blk_next_bio(bio, 0, gfp_mask);
6a0cb1bc	249	bio->bi_iter.bi_sector = sector;
74d46992	250	bio_set_dev(bio, bdev);
6a0cb1bc HR	251	bio_set_op_attrs(bio, REQ_OP_ZONE_RESET, 0);
6a0cb1bc HR	252
6a0cb1bc HR	253	sector += zone_sectors;
	254
	255	/* This may take a while, so be nice to others */
	256	cond_resched();
	257
	258	}
	259
a2d6b3a2 DLM	260	ret = submit_bio_wait(bio);
	261	bio_put(bio);
	262
	263	blk_finish_plug(&plug);
	264
	265	return ret;
6a0cb1bc HR	266	}
6a0cb1bc HR	267	EXPORT_SYMBOL_GPL(blkdev_reset_zones);
3ed05a98	268
56c4bddb	269	/*
3ed05a98 ST	270	* BLKREPORTZONE ioctl processing.
	271	* Called from blkdev_ioctl.
	272	*/
	273	int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
	274	unsigned int cmd, unsigned long arg)
	275	{
	276	void __user argp = (void __user )arg;
	277	struct request_queue *q;
	278	struct blk_zone_report rep;
	279	struct blk_zone *zones;
	280	int ret;
	281
	282	if (!argp)
	283	return -EINVAL;
	284
	285	q = bdev_get_queue(bdev);
	286	if (!q)
	287	return -ENXIO;
	288
	289	if (!blk_queue_is_zoned(q))
	290	return -ENOTTY;
	291
	292	if (!capable(CAP_SYS_ADMIN))
	293	return -EACCES;
	294
	295	if (copy_from_user(&rep, argp, sizeof(struct blk_zone_report)))
	296	return -EFAULT;
	297
	298	if (!rep.nr_zones)
	299	return -EINVAL;
	300
2e85fbaf	301	rep.nr_zones = min(blkdev_nr_zones(bdev), rep.nr_zones);
327ea4ad	302
344476e1 KC	303	zones = kvmalloc_array(rep.nr_zones, sizeof(struct blk_zone),
344476e1 KC	304	GFP_KERNEL \| __GFP_ZERO);
3ed05a98 ST	305	if (!zones)
	306	return -ENOMEM;
	307
bd976e52	308	ret = blkdev_report_zones(bdev, rep.sector, zones, &rep.nr_zones);
3ed05a98 ST	309	if (ret)
	310	goto out;
	311
	312	if (copy_to_user(argp, &rep, sizeof(struct blk_zone_report))) {
	313	ret = -EFAULT;
	314	goto out;
	315	}
	316
	317	if (rep.nr_zones) {
	318	if (copy_to_user(argp + sizeof(struct blk_zone_report), zones,
	319	sizeof(struct blk_zone) * rep.nr_zones))
	320	ret = -EFAULT;
	321	}
	322
	323	out:
327ea4ad	324	kvfree(zones);
3ed05a98 ST	325
	326	return ret;
	327	}
	328
56c4bddb	329	/*
3ed05a98 ST	330	* BLKRESETZONE ioctl processing.
	331	* Called from blkdev_ioctl.
	332	*/
	333	int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
	334	unsigned int cmd, unsigned long arg)
	335	{
	336	void __user argp = (void __user )arg;
	337	struct request_queue *q;
	338	struct blk_zone_range zrange;
	339
	340	if (!argp)
	341	return -EINVAL;
	342
	343	q = bdev_get_queue(bdev);
	344	if (!q)
	345	return -ENXIO;
	346
	347	if (!blk_queue_is_zoned(q))
	348	return -ENOTTY;
	349
	350	if (!capable(CAP_SYS_ADMIN))
	351	return -EACCES;
	352
	353	if (!(mode & FMODE_WRITE))
	354	return -EBADF;
	355
	356	if (copy_from_user(&zrange, argp, sizeof(struct blk_zone_range)))
	357	return -EFAULT;
	358
	359	return blkdev_reset_zones(bdev, zrange.sector, zrange.nr_sectors,
	360	GFP_KERNEL);
	361	}
bf505456 DLM	362
	363	static inline unsigned long *blk_alloc_zone_bitmap(int node,
	364	unsigned int nr_zones)
	365	{
	366	return kcalloc_node(BITS_TO_LONGS(nr_zones), sizeof(unsigned long),
	367	GFP_NOIO, node);
	368	}
	369
	370	/*
	371	* Allocate an array of struct blk_zone to get nr_zones zone information.
	372	* The allocated array may be smaller than nr_zones.
	373	*/
	374	static struct blk_zone blk_alloc_zones(int node, unsigned int nr_zones)
	375	{
	376	size_t size = nr_zones sizeof(struct blk_zone);
	377	struct page *page;
	378	int order;
	379
927b6b2d	380	for (order = get_order(size); order >= 0; order--) {
bf505456 DLM	381	page = alloc_pages_node(node, GFP_NOIO \| __GFP_ZERO, order);
	382	if (page) {
	383	nr_zones = min_t(unsigned int, nr_zones,
	384	(PAGE_SIZE << order) / sizeof(struct blk_zone));
	385	return page_address(page);
	386	}
	387	}
	388
	389	return NULL;
	390	}
	391
	392	void blk_queue_free_zone_bitmaps(struct request_queue *q)
	393	{
	394	kfree(q->seq_zones_bitmap);
	395	q->seq_zones_bitmap = NULL;
	396	kfree(q->seq_zones_wlock);
	397	q->seq_zones_wlock = NULL;
	398	}
	399
	400	/**
	401	* blk_revalidate_disk_zones - (re)allocate and initialize zone bitmaps
	402	* @disk: Target disk
	403	*
	404	* Helper function for low-level device drivers to (re) allocate and initialize
	405	* a disk request queue zone bitmaps. This functions should normally be called
	406	* within the disk ->revalidate method. For BIO based queues, no zone bitmap
	407	* is allocated.
	408	*/
	409	int blk_revalidate_disk_zones(struct gendisk *disk)
	410	{
	411	struct request_queue *q = disk->queue;
	412	unsigned int nr_zones = __blkdev_nr_zones(q, get_capacity(disk));
	413	unsigned long seq_zones_wlock = NULL, seq_zones_bitmap = NULL;
	414	unsigned int i, rep_nr_zones = 0, z = 0, nrz;
	415	struct blk_zone *zones = NULL;
bd976e52	416	unsigned int noio_flag;
bf505456 DLM	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
bd976e52 DLM	429	/*
	430	* Ensure that all memory allocations in this context are done as
	431	* if GFP_NOIO was specified.
	432	*/
	433	noio_flag = memalloc_noio_save();
	434
bf505456 DLM	435	if (!blk_queue_is_zoned(q) \|\| !nr_zones) {
	436	nr_zones = 0;
	437	goto update;
	438	}
	439
	440	/* Allocate bitmaps */
	441	ret = -ENOMEM;
	442	seq_zones_wlock = blk_alloc_zone_bitmap(q->node, nr_zones);
	443	if (!seq_zones_wlock)
	444	goto out;
	445	seq_zones_bitmap = blk_alloc_zone_bitmap(q->node, nr_zones);
	446	if (!seq_zones_bitmap)
	447	goto out;
	448
	449	/* Get zone information and initialize seq_zones_bitmap */
	450	rep_nr_zones = nr_zones;
	451	zones = blk_alloc_zones(q->node, &rep_nr_zones);
	452	if (!zones)
	453	goto out;
	454
	455	while (z < nr_zones) {
	456	nrz = min(nr_zones - z, rep_nr_zones);
bd976e52	457	ret = blk_report_zones(disk, sector, zones, &nrz);
bf505456 DLM	458	if (ret)
	459	goto out;
	460	if (!nrz)
	461	break;
	462	for (i = 0; i < nrz; i++) {
	463	if (zones[i].type != BLK_ZONE_TYPE_CONVENTIONAL)
	464	set_bit(z, seq_zones_bitmap);
	465	z++;
	466	}
	467	sector += nrz * blk_queue_zone_sectors(q);
	468	}
	469
	470	if (WARN_ON(z != nr_zones)) {
	471	ret = -EIO;
	472	goto out;
	473	}
	474
	475	update:
	476	/*
	477	* Install the new bitmaps, making sure the queue is stopped and
	478	* all I/Os are completed (i.e. a scheduler is not referencing the
	479	* bitmaps).
	480	*/
	481	blk_mq_freeze_queue(q);
	482	q->nr_zones = nr_zones;
	483	swap(q->seq_zones_wlock, seq_zones_wlock);
	484	swap(q->seq_zones_bitmap, seq_zones_bitmap);
	485	blk_mq_unfreeze_queue(q);
	486
	487	out:
bd976e52 DLM	488	memalloc_noio_restore(noio_flag);
bd976e52 DLM	489
bf505456 DLM	490	free_pages((unsigned long)zones,
	491	get_order(rep_nr_zones * sizeof(struct blk_zone)));
	492	kfree(seq_zones_wlock);
	493	kfree(seq_zones_bitmap);
	494
	495	if (ret) {
	496	pr_warn("%s: failed to revalidate zones\n", disk->disk_name);
	497	blk_mq_freeze_queue(q);
	498	blk_queue_free_zone_bitmaps(q);
	499	blk_mq_unfreeze_queue(q);
	500	}
	501
	502	return ret;
	503	}
	504	EXPORT_SYMBOL_GPL(blk_revalidate_disk_zones);
	505