blkdev.h 51.8 KB
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/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _LINUX_BLKDEV_H
#define _LINUX_BLKDEV_H

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#include <linux/sched.h>
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#include <linux/sched/clock.h>
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#ifdef CONFIG_BLOCK

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#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/list.h>
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#include <linux/llist.h>
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#include <linux/timer.h>
#include <linux/workqueue.h>
#include <linux/pagemap.h>
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#include <linux/backing-dev-defs.h>
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#include <linux/wait.h>
#include <linux/mempool.h>
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#include <linux/pfn.h>
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#include <linux/bio.h>
#include <linux/stringify.h>
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#include <linux/gfp.h>
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#include <linux/bsg.h>
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#include <linux/smp.h>
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#include <linux/rcupdate.h>
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#include <linux/percpu-refcount.h>
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#include <linux/scatterlist.h>
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#include <linux/blkzoned.h>
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struct module;
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struct scsi_ioctl_command;

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struct request_queue;
struct elevator_queue;
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struct blk_trace;
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struct request;
struct sg_io_hdr;
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struct bsg_job;
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struct blkcg_gq;
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struct blk_flush_queue;
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struct pr_ops;
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struct rq_qos;
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struct blk_queue_stats;
struct blk_stat_callback;
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#define BLKDEV_MIN_RQ	4
#define BLKDEV_MAX_RQ	128	/* Default maximum */

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/* Must be consistent with blk_mq_poll_stats_bkt() */
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#define BLK_MQ_POLL_STATS_BKTS 16

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/* Doing classic polling */
#define BLK_MQ_POLL_CLASSIC -1

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/*
 * Maximum number of blkcg policies allowed to be registered concurrently.
 * Defined here to simplify include dependency.
 */
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#define BLKCG_MAX_POLS		5
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typedef void (rq_end_io_fn)(struct request *, blk_status_t);
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/*
 * request flags */
typedef __u32 __bitwise req_flags_t;

/* elevator knows about this request */
#define RQF_SORTED		((__force req_flags_t)(1 << 0))
/* drive already may have started this one */
#define RQF_STARTED		((__force req_flags_t)(1 << 1))
/* may not be passed by ioscheduler */
#define RQF_SOFTBARRIER		((__force req_flags_t)(1 << 3))
/* request for flush sequence */
#define RQF_FLUSH_SEQ		((__force req_flags_t)(1 << 4))
/* merge of different types, fail separately */
#define RQF_MIXED_MERGE		((__force req_flags_t)(1 << 5))
/* track inflight for MQ */
#define RQF_MQ_INFLIGHT		((__force req_flags_t)(1 << 6))
/* don't call prep for this one */
#define RQF_DONTPREP		((__force req_flags_t)(1 << 7))
/* set for "ide_preempt" requests and also for requests for which the SCSI
   "quiesce" state must be ignored. */
#define RQF_PREEMPT		((__force req_flags_t)(1 << 8))
/* contains copies of user pages */
#define RQF_COPY_USER		((__force req_flags_t)(1 << 9))
/* vaguely specified driver internal error.  Ignored by the block layer */
#define RQF_FAILED		((__force req_flags_t)(1 << 10))
/* don't warn about errors */
#define RQF_QUIET		((__force req_flags_t)(1 << 11))
/* elevator private data attached */
#define RQF_ELVPRIV		((__force req_flags_t)(1 << 12))
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/* account into disk and partition IO statistics */
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#define RQF_IO_STAT		((__force req_flags_t)(1 << 13))
/* request came from our alloc pool */
#define RQF_ALLOCED		((__force req_flags_t)(1 << 14))
/* runtime pm request */
#define RQF_PM			((__force req_flags_t)(1 << 15))
/* on IO scheduler merge hash */
#define RQF_HASHED		((__force req_flags_t)(1 << 16))
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/* track IO completion time */
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#define RQF_STATS		((__force req_flags_t)(1 << 17))
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/* Look at ->special_vec for the actual data payload instead of the
   bio chain. */
#define RQF_SPECIAL_PAYLOAD	((__force req_flags_t)(1 << 18))
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/* The per-zone write lock is held for this request */
#define RQF_ZONE_WRITE_LOCKED	((__force req_flags_t)(1 << 19))
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/* already slept for hybrid poll */
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#define RQF_MQ_POLL_SLEPT	((__force req_flags_t)(1 << 20))
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/* ->timeout has been called, don't expire again */
#define RQF_TIMED_OUT		((__force req_flags_t)(1 << 21))
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/* flags that prevent us from merging requests: */
#define RQF_NOMERGE_FLAGS \
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	(RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
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/*
 * Request state for blk-mq.
 */
enum mq_rq_state {
	MQ_RQ_IDLE		= 0,
	MQ_RQ_IN_FLIGHT		= 1,
	MQ_RQ_COMPLETE		= 2,
};

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/*
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 * Try to put the fields that are referenced together in the same cacheline.
 *
 * If you modify this structure, make sure to update blk_rq_init() and
 * especially blk_mq_rq_ctx_init() to take care of the added fields.
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 */
struct request {
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	struct request_queue *q;
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	struct blk_mq_ctx *mq_ctx;
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	struct blk_mq_hw_ctx *mq_hctx;
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	unsigned int cmd_flags;		/* op and common flags */
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	req_flags_t rq_flags;
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	int tag;
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	int internal_tag;

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	/* the following two fields are internal, NEVER access directly */
	unsigned int __data_len;	/* total data len */
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	sector_t __sector;		/* sector cursor */
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	struct bio *bio;
	struct bio *biotail;

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	struct list_head queuelist;

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	/*
	 * The hash is used inside the scheduler, and killed once the
	 * request reaches the dispatch list. The ipi_list is only used
	 * to queue the request for softirq completion, which is long
	 * after the request has been unhashed (and even removed from
	 * the dispatch list).
	 */
	union {
		struct hlist_node hash;	/* merge hash */
		struct list_head ipi_list;
	};

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	/*
	 * The rb_node is only used inside the io scheduler, requests
	 * are pruned when moved to the dispatch queue. So let the
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	 * completion_data share space with the rb_node.
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	 */
	union {
		struct rb_node rb_node;	/* sort/lookup */
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		struct bio_vec special_vec;
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		void *completion_data;
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		int error_count; /* for legacy drivers, don't use */
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	};
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	/*
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	 * Three pointers are available for the IO schedulers, if they need
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	 * more they have to dynamically allocate it.  Flush requests are
	 * never put on the IO scheduler. So let the flush fields share
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	 * space with the elevator data.
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	 */
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	union {
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		struct {
			struct io_cq		*icq;
			void			*priv[2];
		} elv;

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		struct {
			unsigned int		seq;
			struct list_head	list;
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			rq_end_io_fn		*saved_end_io;
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		} flush;
	};
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	struct gendisk *rq_disk;
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	struct hd_struct *part;
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#ifdef CONFIG_BLK_RQ_ALLOC_TIME
	/* Time that the first bio started allocating this request. */
	u64 alloc_time_ns;
#endif
	/* Time that this request was allocated for this IO. */
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	u64 start_time_ns;
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	/* Time that I/O was submitted to the device. */
	u64 io_start_time_ns;

#ifdef CONFIG_BLK_WBT
	unsigned short wbt_flags;
#endif
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	/*
	 * rq sectors used for blk stats. It has the same value
	 * with blk_rq_sectors(rq), except that it never be zeroed
	 * by completion.
	 */
	unsigned short stats_sectors;
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	/*
	 * Number of scatter-gather DMA addr+len pairs after
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	 * physical address coalescing is performed.
	 */
	unsigned short nr_phys_segments;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
	unsigned short nr_integrity_segments;
#endif
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	unsigned short write_hint;
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	unsigned short ioprio;

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	unsigned int extra_len;	/* length of alignment and padding */
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	enum mq_rq_state state;
	refcount_t ref;
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	unsigned int timeout;
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	unsigned long deadline;
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	union {
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		struct __call_single_data csd;
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		u64 fifo_time;
	};

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	/*
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	 * completion callback.
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	 */
	rq_end_io_fn *end_io;
	void *end_io_data;
};

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static inline bool blk_op_is_scsi(unsigned int op)
{
	return op == REQ_OP_SCSI_IN || op == REQ_OP_SCSI_OUT;
}

static inline bool blk_op_is_private(unsigned int op)
{
	return op == REQ_OP_DRV_IN || op == REQ_OP_DRV_OUT;
}

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static inline bool blk_rq_is_scsi(struct request *rq)
{
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	return blk_op_is_scsi(req_op(rq));
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}

static inline bool blk_rq_is_private(struct request *rq)
{
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	return blk_op_is_private(req_op(rq));
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}

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static inline bool blk_rq_is_passthrough(struct request *rq)
{
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	return blk_rq_is_scsi(rq) || blk_rq_is_private(rq);
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}

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static inline bool bio_is_passthrough(struct bio *bio)
{
	unsigned op = bio_op(bio);

	return blk_op_is_scsi(op) || blk_op_is_private(op);
}

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static inline unsigned short req_get_ioprio(struct request *req)
{
	return req->ioprio;
}

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#include <linux/elevator.h>

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struct blk_queue_ctx;

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typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
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struct bio_vec;
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typedef int (dma_drain_needed_fn)(struct request *);
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enum blk_eh_timer_return {
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	BLK_EH_DONE,		/* drivers has completed the command */
	BLK_EH_RESET_TIMER,	/* reset timer and try again */
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};

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enum blk_queue_state {
	Queue_down,
	Queue_up,
};

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#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
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#define BLK_SCSI_MAX_CMDS	(256)
#define BLK_SCSI_CMD_PER_LONG	(BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))

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/*
 * Zoned block device models (zoned limit).
 */
enum blk_zoned_model {
	BLK_ZONED_NONE,	/* Regular block device */
	BLK_ZONED_HA,	/* Host-aware zoned block device */
	BLK_ZONED_HM,	/* Host-managed zoned block device */
};

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struct queue_limits {
	unsigned long		bounce_pfn;
	unsigned long		seg_boundary_mask;
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	unsigned long		virt_boundary_mask;
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	unsigned int		max_hw_sectors;
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	unsigned int		max_dev_sectors;
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	unsigned int		chunk_sectors;
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	unsigned int		max_sectors;
	unsigned int		max_segment_size;
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	unsigned int		physical_block_size;
	unsigned int		alignment_offset;
	unsigned int		io_min;
	unsigned int		io_opt;
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	unsigned int		max_discard_sectors;
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	unsigned int		max_hw_discard_sectors;
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	unsigned int		max_write_same_sectors;
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	unsigned int		max_write_zeroes_sectors;
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	unsigned int		discard_granularity;
	unsigned int		discard_alignment;
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	unsigned short		logical_block_size;
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	unsigned short		max_segments;
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	unsigned short		max_integrity_segments;
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	unsigned short		max_discard_segments;
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	unsigned char		misaligned;
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	unsigned char		discard_misaligned;
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	unsigned char		raid_partial_stripes_expensive;
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	enum blk_zoned_model	zoned;
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};

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typedef int (*report_zones_cb)(struct blk_zone *zone, unsigned int idx,
			       void *data);

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#ifdef CONFIG_BLK_DEV_ZONED

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#define BLK_ALL_ZONES  ((unsigned int)-1)
int blkdev_report_zones(struct block_device *bdev, sector_t sector,
			unsigned int nr_zones, report_zones_cb cb, void *data);
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unsigned int blkdev_nr_zones(struct gendisk *disk);
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extern int blkdev_zone_mgmt(struct block_device *bdev, enum req_opf op,
			    sector_t sectors, sector_t nr_sectors,
			    gfp_t gfp_mask);
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extern int blk_revalidate_disk_zones(struct gendisk *disk);
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extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
				     unsigned int cmd, unsigned long arg);
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extern int blkdev_zone_mgmt_ioctl(struct block_device *bdev, fmode_t mode,
				  unsigned int cmd, unsigned long arg);
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#else /* CONFIG_BLK_DEV_ZONED */

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static inline unsigned int blkdev_nr_zones(struct gendisk *disk)
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{
	return 0;
}
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static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
					    fmode_t mode, unsigned int cmd,
					    unsigned long arg)
{
	return -ENOTTY;
}

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static inline int blkdev_zone_mgmt_ioctl(struct block_device *bdev,
					 fmode_t mode, unsigned int cmd,
					 unsigned long arg)
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{
	return -ENOTTY;
}

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#endif /* CONFIG_BLK_DEV_ZONED */

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struct request_queue {
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	struct request		*last_merge;
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	struct elevator_queue	*elevator;
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	struct blk_queue_stats	*stats;
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	struct rq_qos		*rq_qos;
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	make_request_fn		*make_request_fn;
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	dma_drain_needed_fn	*dma_drain_needed;
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	const struct blk_mq_ops	*mq_ops;
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	/* sw queues */
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	struct blk_mq_ctx __percpu	*queue_ctx;
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	unsigned int		queue_depth;

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	/* hw dispatch queues */
	struct blk_mq_hw_ctx	**queue_hw_ctx;
	unsigned int		nr_hw_queues;

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	struct backing_dev_info	*backing_dev_info;
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	/*
	 * The queue owner gets to use this for whatever they like.
	 * ll_rw_blk doesn't touch it.
	 */
	void			*queuedata;

	/*
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	 * various queue flags, see QUEUE_* below
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	 */
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	unsigned long		queue_flags;
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	/*
	 * Number of contexts that have called blk_set_pm_only(). If this
	 * counter is above zero then only RQF_PM and RQF_PREEMPT requests are
	 * processed.
	 */
	atomic_t		pm_only;
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	/*
	 * ida allocated id for this queue.  Used to index queues from
	 * ioctx.
	 */
	int			id;

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	/*
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	 * queue needs bounce pages for pages above this limit
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	 */
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	gfp_t			bounce_gfp;
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	spinlock_t		queue_lock;
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	/*
	 * queue kobject
	 */
	struct kobject kobj;

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	/*
	 * mq queue kobject
	 */
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	struct kobject *mq_kobj;
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#ifdef  CONFIG_BLK_DEV_INTEGRITY
	struct blk_integrity integrity;
#endif	/* CONFIG_BLK_DEV_INTEGRITY */

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#ifdef CONFIG_PM
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	struct device		*dev;
	int			rpm_status;
	unsigned int		nr_pending;
#endif

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	/*
	 * queue settings
	 */
	unsigned long		nr_requests;	/* Max # of requests */

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	unsigned int		dma_drain_size;
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	void			*dma_drain_buffer;
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	unsigned int		dma_pad_mask;
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	unsigned int		dma_alignment;

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	unsigned int		rq_timeout;
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	int			poll_nsec;
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	struct blk_stat_callback	*poll_cb;
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	struct blk_rq_stat	poll_stat[BLK_MQ_POLL_STATS_BKTS];
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	struct timer_list	timeout;
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	struct work_struct	timeout_work;
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	struct list_head	icq_list;
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#ifdef CONFIG_BLK_CGROUP
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	DECLARE_BITMAP		(blkcg_pols, BLKCG_MAX_POLS);
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	struct blkcg_gq		*root_blkg;
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	struct list_head	blkg_list;
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#endif
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	struct queue_limits	limits;

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	unsigned int		required_elevator_features;

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#ifdef CONFIG_BLK_DEV_ZONED
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	/*
	 * Zoned block device information for request dispatch control.
	 * nr_zones is the total number of zones of the device. This is always
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	 * 0 for regular block devices. conv_zones_bitmap is a bitmap of nr_zones
	 * bits which indicates if a zone is conventional (bit set) or
	 * sequential (bit clear). seq_zones_wlock is a bitmap of nr_zones
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	 * bits which indicates if a zone is write locked, that is, if a write
	 * request targeting the zone was dispatched. All three fields are
	 * initialized by the low level device driver (e.g. scsi/sd.c).
	 * Stacking drivers (device mappers) may or may not initialize
	 * these fields.
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	 *
	 * Reads of this information must be protected with blk_queue_enter() /
	 * blk_queue_exit(). Modifying this information is only allowed while
	 * no requests are being processed. See also blk_mq_freeze_queue() and
	 * blk_mq_unfreeze_queue().
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	 */
	unsigned int		nr_zones;
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	unsigned long		*conv_zones_bitmap;
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	unsigned long		*seq_zones_wlock;
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#endif /* CONFIG_BLK_DEV_ZONED */
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	/*
	 * sg stuff
	 */
	unsigned int		sg_timeout;
	unsigned int		sg_reserved_size;
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	int			node;
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#ifdef CONFIG_BLK_DEV_IO_TRACE
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	struct blk_trace	*blk_trace;
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	struct mutex		blk_trace_mutex;
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#endif
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	/*
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	 * for flush operations
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	 */
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	struct blk_flush_queue	*fq;
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	struct list_head	requeue_list;
	spinlock_t		requeue_lock;
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	struct delayed_work	requeue_work;
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	struct mutex		sysfs_lock;
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	struct mutex		sysfs_dir_lock;
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	/*
	 * for reusing dead hctx instance in case of updating
	 * nr_hw_queues
	 */
	struct list_head	unused_hctx_list;
	spinlock_t		unused_hctx_lock;

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	int			mq_freeze_depth;
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#if defined(CONFIG_BLK_DEV_BSG)
	struct bsg_class_device bsg_dev;
#endif
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#ifdef CONFIG_BLK_DEV_THROTTLING
	/* Throttle data */
	struct throtl_data *td;
#endif
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	struct rcu_head		rcu_head;
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	wait_queue_head_t	mq_freeze_wq;
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	/*
	 * Protect concurrent access to q_usage_counter by
	 * percpu_ref_kill() and percpu_ref_reinit().
	 */
	struct mutex		mq_freeze_lock;
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	struct percpu_ref	q_usage_counter;
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	struct blk_mq_tag_set	*tag_set;
	struct list_head	tag_set_list;
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	struct bio_set		bio_split;
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#ifdef CONFIG_BLK_DEBUG_FS
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	struct dentry		*debugfs_dir;
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	struct dentry		*sched_debugfs_dir;
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	struct dentry		*rqos_debugfs_dir;
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#endif

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	bool			mq_sysfs_init_done;
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	size_t			cmd_size;
581 582

	struct work_struct	release_work;
583 584 585

#define BLK_MAX_WRITE_HINTS	5
	u64			write_hints[BLK_MAX_WRITE_HINTS];
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};

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#define QUEUE_FLAG_STOPPED	0	/* queue is stopped */
#define QUEUE_FLAG_DYING	1	/* queue being torn down */
#define QUEUE_FLAG_NOMERGES     3	/* disable merge attempts */
#define QUEUE_FLAG_SAME_COMP	4	/* complete on same CPU-group */
#define QUEUE_FLAG_FAIL_IO	5	/* fake timeout */
#define QUEUE_FLAG_NONROT	6	/* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT		QUEUE_FLAG_NONROT /* paravirt device */
#define QUEUE_FLAG_IO_STAT	7	/* do disk/partitions IO accounting */
#define QUEUE_FLAG_DISCARD	8	/* supports DISCARD */
#define QUEUE_FLAG_NOXMERGES	9	/* No extended merges */
#define QUEUE_FLAG_ADD_RANDOM	10	/* Contributes to random pool */
#define QUEUE_FLAG_SECERASE	11	/* supports secure erase */
#define QUEUE_FLAG_SAME_FORCE	12	/* force complete on same CPU */
#define QUEUE_FLAG_DEAD		13	/* queue tear-down finished */
#define QUEUE_FLAG_INIT_DONE	14	/* queue is initialized */
#define QUEUE_FLAG_POLL		16	/* IO polling enabled if set */
#define QUEUE_FLAG_WC		17	/* Write back caching */
#define QUEUE_FLAG_FUA		18	/* device supports FUA writes */
#define QUEUE_FLAG_DAX		19	/* device supports DAX */
#define QUEUE_FLAG_STATS	20	/* track IO start and completion times */
#define QUEUE_FLAG_POLL_STATS	21	/* collecting stats for hybrid polling */
#define QUEUE_FLAG_REGISTERED	22	/* queue has been registered to a disk */
#define QUEUE_FLAG_SCSI_PASSTHROUGH 23	/* queue supports SCSI commands */
#define QUEUE_FLAG_QUIESCED	24	/* queue has been quiesced */
#define QUEUE_FLAG_PCI_P2PDMA	25	/* device supports PCI p2p requests */
613
#define QUEUE_FLAG_ZONE_RESETALL 26	/* supports Zone Reset All */
614
#define QUEUE_FLAG_RQ_ALLOC_TIME 27	/* record rq->alloc_time_ns */
615

616
#define QUEUE_FLAG_MQ_DEFAULT	((1 << QUEUE_FLAG_IO_STAT) |		\
617
				 (1 << QUEUE_FLAG_SAME_COMP))
618

619 620 621 622
void blk_queue_flag_set(unsigned int flag, struct request_queue *q);
void blk_queue_flag_clear(unsigned int flag, struct request_queue *q);
bool blk_queue_flag_test_and_set(unsigned int flag, struct request_queue *q);

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#define blk_queue_stopped(q)	test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
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#define blk_queue_dying(q)	test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
625
#define blk_queue_dead(q)	test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
626
#define blk_queue_init_done(q)	test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
627
#define blk_queue_nomerges(q)	test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
628 629
#define blk_queue_noxmerges(q)	\
	test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
630
#define blk_queue_nonrot(q)	test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
631
#define blk_queue_io_stat(q)	test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
632
#define blk_queue_add_random(q)	test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
633
#define blk_queue_discard(q)	test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
634 635
#define blk_queue_zone_resetall(q)	\
	test_bit(QUEUE_FLAG_ZONE_RESETALL, &(q)->queue_flags)
636 637
#define blk_queue_secure_erase(q) \
	(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
638
#define blk_queue_dax(q)	test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
639 640
#define blk_queue_scsi_passthrough(q)	\
	test_bit(QUEUE_FLAG_SCSI_PASSTHROUGH, &(q)->queue_flags)
641 642
#define blk_queue_pci_p2pdma(q)	\
	test_bit(QUEUE_FLAG_PCI_P2PDMA, &(q)->queue_flags)
643 644 645 646 647 648
#ifdef CONFIG_BLK_RQ_ALLOC_TIME
#define blk_queue_rq_alloc_time(q)	\
	test_bit(QUEUE_FLAG_RQ_ALLOC_TIME, &(q)->queue_flags)
#else
#define blk_queue_rq_alloc_time(q)	false
#endif
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650 651 652
#define blk_noretry_request(rq) \
	((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
			     REQ_FAILFAST_DRIVER))
653
#define blk_queue_quiesced(q)	test_bit(QUEUE_FLAG_QUIESCED, &(q)->queue_flags)
654
#define blk_queue_pm_only(q)	atomic_read(&(q)->pm_only)
655
#define blk_queue_fua(q)	test_bit(QUEUE_FLAG_FUA, &(q)->queue_flags)
656
#define blk_queue_registered(q)	test_bit(QUEUE_FLAG_REGISTERED, &(q)->queue_flags)
657

658 659
extern void blk_set_pm_only(struct request_queue *q);
extern void blk_clear_pm_only(struct request_queue *q);
660

661 662 663 664
static inline bool blk_account_rq(struct request *rq)
{
	return (rq->rq_flags & RQF_STARTED) && !blk_rq_is_passthrough(rq);
}
665

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#define list_entry_rq(ptr)	list_entry((ptr), struct request, queuelist)

668
#define rq_data_dir(rq)		(op_is_write(req_op(rq)) ? WRITE : READ)
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670 671 672
#define rq_dma_dir(rq) \
	(op_is_write(req_op(rq)) ? DMA_TO_DEVICE : DMA_FROM_DEVICE)

673 674 675 676
#define dma_map_bvec(dev, bv, dir, attrs) \
	dma_map_page_attrs(dev, (bv)->bv_page, (bv)->bv_offset, (bv)->bv_len, \
	(dir), (attrs))

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static inline bool queue_is_mq(struct request_queue *q)
678
{
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	return q->mq_ops;
680 681
}

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static inline enum blk_zoned_model
blk_queue_zoned_model(struct request_queue *q)
{
	return q->limits.zoned;
}

static inline bool blk_queue_is_zoned(struct request_queue *q)
{
	switch (blk_queue_zoned_model(q)) {
	case BLK_ZONED_HA:
	case BLK_ZONED_HM:
		return true;
	default:
		return false;
	}
}

699
static inline sector_t blk_queue_zone_sectors(struct request_queue *q)
700 701 702 703
{
	return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
}

704
#ifdef CONFIG_BLK_DEV_ZONED
705 706 707 708 709
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
	return blk_queue_is_zoned(q) ? q->nr_zones : 0;
}

710 711 712 713 714 715 716 717 718 719 720
static inline unsigned int blk_queue_zone_no(struct request_queue *q,
					     sector_t sector)
{
	if (!blk_queue_is_zoned(q))
		return 0;
	return sector >> ilog2(q->limits.chunk_sectors);
}

static inline bool blk_queue_zone_is_seq(struct request_queue *q,
					 sector_t sector)
{
721
	if (!blk_queue_is_zoned(q))
722
		return false;
723 724 725
	if (!q->conv_zones_bitmap)
		return true;
	return !test_bit(blk_queue_zone_no(q, sector), q->conv_zones_bitmap);
726
}
727 728 729 730 731
#else /* CONFIG_BLK_DEV_ZONED */
static inline unsigned int blk_queue_nr_zones(struct request_queue *q)
{
	return 0;
}
732
#endif /* CONFIG_BLK_DEV_ZONED */
733

734 735
static inline bool rq_is_sync(struct request *rq)
{
736
	return op_is_sync(rq->cmd_flags);
737 738
}

739 740
static inline bool rq_mergeable(struct request *rq)
{
741
	if (blk_rq_is_passthrough(rq))
742
		return false;
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744 745 746
	if (req_op(rq) == REQ_OP_FLUSH)
		return false;

747 748 749
	if (req_op(rq) == REQ_OP_WRITE_ZEROES)
		return false;

750
	if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
751 752
		return false;
	if (rq->rq_flags & RQF_NOMERGE_FLAGS)
753 754 755 756
		return false;

	return true;
}
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758 759
static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
{
760 761
	if (bio_page(a) == bio_page(b) &&
	    bio_offset(a) == bio_offset(b))
762 763 764 765 766
		return true;

	return false;
}

767 768 769 770 771 772 773 774
static inline unsigned int blk_queue_depth(struct request_queue *q)
{
	if (q->queue_depth)
		return q->queue_depth;

	return q->nr_requests;
}

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extern unsigned long blk_max_low_pfn, blk_max_pfn;

/*
 * standard bounce addresses:
 *
 * BLK_BOUNCE_HIGH	: bounce all highmem pages
 * BLK_BOUNCE_ANY	: don't bounce anything
 * BLK_BOUNCE_ISA	: bounce pages above ISA DMA boundary
 */
784 785

#if BITS_PER_LONG == 32
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#define BLK_BOUNCE_HIGH		((u64)blk_max_low_pfn << PAGE_SHIFT)
787 788 789 790
#else
#define BLK_BOUNCE_HIGH		-1ULL
#endif
#define BLK_BOUNCE_ANY		(-1ULL)
791
#define BLK_BOUNCE_ISA		(DMA_BIT_MASK(24))
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793 794 795 796
/*
 * default timeout for SG_IO if none specified
 */
#define BLK_DEFAULT_SG_TIMEOUT	(60 * HZ)
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#define BLK_MIN_SG_TIMEOUT	(7 * HZ)
798

799 800 801 802
struct rq_map_data {
	struct page **pages;
	int page_order;
	int nr_entries;
803
	unsigned long offset;
804
	int null_mapped;
805
	int from_user;
806 807
};

808
struct req_iterator {
809
	struct bvec_iter iter;
810 811 812 813
	struct bio *bio;
};

/* This should not be used directly - use rq_for_each_segment */
814 815
#define for_each_bio(_bio)		\
	for (; _bio; _bio = _bio->bi_next)
816
#define __rq_for_each_bio(_bio, rq)	\
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	if ((rq->bio))			\
		for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)

820 821
#define rq_for_each_segment(bvl, _rq, _iter)			\
	__rq_for_each_bio(_iter.bio, _rq)			\
822
		bio_for_each_segment(bvl, _iter.bio, _iter.iter)
823

824 825 826 827
#define rq_for_each_bvec(bvl, _rq, _iter)			\
	__rq_for_each_bio(_iter.bio, _rq)			\
		bio_for_each_bvec(bvl, _iter.bio, _iter.iter)

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#define rq_iter_last(bvec, _iter)				\
829
		(_iter.bio->bi_next == NULL &&			\
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		 bio_iter_last(bvec, _iter.iter))
831

832 833 834 835 836 837 838 839 840 841 842
#ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
# error	"You should define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE for your platform"
#endif
#if ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE
extern void rq_flush_dcache_pages(struct request *rq);
#else
static inline void rq_flush_dcache_pages(struct request *rq)
{
}
#endif

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extern int blk_register_queue(struct gendisk *disk);
extern void blk_unregister_queue(struct gendisk *disk);
845
extern blk_qc_t generic_make_request(struct bio *bio);
846
extern blk_qc_t direct_make_request(struct bio *bio);
847
extern void blk_rq_init(struct request_queue *q, struct request *rq);
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extern void blk_put_request(struct request *);
849
extern struct request *blk_get_request(struct request_queue *, unsigned int op,
850
				       blk_mq_req_flags_t flags);
851
extern int blk_lld_busy(struct request_queue *q);
852 853 854 855 856
extern int blk_rq_prep_clone(struct request *rq, struct request *rq_src,
			     struct bio_set *bs, gfp_t gfp_mask,
			     int (*bio_ctr)(struct bio *, struct bio *, void *),
			     void *data);
extern void blk_rq_unprep_clone(struct request *rq);
857
extern blk_status_t blk_insert_cloned_request(struct request_queue *q,
858
				     struct request *rq);
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extern int blk_rq_append_bio(struct request *rq, struct bio **bio);
860
extern void blk_queue_split(struct request_queue *, struct bio **);
861
extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
862 863
extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
			      unsigned int, void __user *);
864 865
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
			  unsigned int, void __user *);
866 867
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
			 struct scsi_ioctl_command __user *);
868 869
extern int get_sg_io_hdr(struct sg_io_hdr *hdr, const void __user *argp);
extern int put_sg_io_hdr(const struct sg_io_hdr *hdr, void __user *argp);
870

871
extern int blk_queue_enter(struct request_queue *q, blk_mq_req_flags_t flags);
872
extern void blk_queue_exit(struct request_queue *q);
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extern void blk_sync_queue(struct request_queue *q);
874
extern int blk_rq_map_user(struct request_queue *, struct request *,
875 876
			   struct rq_map_data *, void __user *, unsigned long,
			   gfp_t);
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extern int blk_rq_unmap_user(struct bio *);
878 879
extern int blk_rq_map_kern(struct request_queue *, struct request *, void *, unsigned int, gfp_t);
extern int blk_rq_map_user_iov(struct request_queue *, struct request *,
880 881
			       struct rq_map_data *, const struct iov_iter *,
			       gfp_t);
882
extern void blk_execute_rq(struct request_queue *, struct gendisk *,
883
			  struct request *, int);
884
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
885
				  struct request *, int, rq_end_io_fn *);
886

887 888 889
/* Helper to convert REQ_OP_XXX to its string format XXX */
extern const char *blk_op_str(unsigned int op);

890 891 892
int blk_status_to_errno(blk_status_t status);
blk_status_t errno_to_blk_status(int errno);

893
int blk_poll(struct request_queue *q, blk_qc_t cookie, bool spin);
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894

895
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
L
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896
{
897
	return bdev->bd_disk->queue;	/* this is never NULL */
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}

900 901 902 903 904 905 906 907 908 909 910 911 912
/*
 * The basic unit of block I/O is a sector. It is used in a number of contexts
 * in Linux (blk, bio, genhd). The size of one sector is 512 = 2**9
 * bytes. Variables of type sector_t represent an offset or size that is a
 * multiple of 512 bytes. Hence these two constants.
 */
#ifndef SECTOR_SHIFT
#define SECTOR_SHIFT 9
#endif
#ifndef SECTOR_SIZE
#define SECTOR_SIZE (1 << SECTOR_SHIFT)
#endif

913
/*
914 915 916 917 918 919
 * blk_rq_pos()			: the current sector
 * blk_rq_bytes()		: bytes left in the entire request
 * blk_rq_cur_bytes()		: bytes left in the current segment
 * blk_rq_err_bytes()		: bytes left till the next error boundary
 * blk_rq_sectors()		: sectors left in the entire request
 * blk_rq_cur_sectors()		: sectors left in the current segment
920
 * blk_rq_stats_sectors()	: sectors of the entire request used for stats
921
 */
922 923
static inline sector_t blk_rq_pos(const struct request *rq)
{
924
	return rq->__sector;
925 926 927 928
}

static inline unsigned int blk_rq_bytes(const struct request *rq)
{
929
	return rq->__data_len;
930 931
}

932 933 934 935
static inline int blk_rq_cur_bytes(const struct request *rq)
{
	return rq->bio ? bio_cur_bytes(rq->bio) : 0;
}
936

937 938
extern unsigned int blk_rq_err_bytes(const struct request *rq);

939 940
static inline unsigned int blk_rq_sectors(const struct request *rq)
{
941
	return blk_rq_bytes(rq) >> SECTOR_SHIFT;
942 943 944 945
}

static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
{
946
	return blk_rq_cur_bytes(rq) >> SECTOR_SHIFT;
947 948
}

949 950 951 952 953
static inline unsigned int blk_rq_stats_sectors(const struct request *rq)
{
	return rq->stats_sectors;
}

954
#ifdef CONFIG_BLK_DEV_ZONED
955 956 957 958 959 960 961 962 963
static inline unsigned int blk_rq_zone_no(struct request *rq)
{
	return blk_queue_zone_no(rq->q, blk_rq_pos(rq));
}

static inline unsigned int blk_rq_zone_is_seq(struct request *rq)
{
	return blk_queue_zone_is_seq(rq->q, blk_rq_pos(rq));
}
964
#endif /* CONFIG_BLK_DEV_ZONED */
965

966 967 968 969 970 971 972 973 974 975 976 977 978
/*
 * Some commands like WRITE SAME have a payload or data transfer size which
 * is different from the size of the request.  Any driver that supports such
 * commands using the RQF_SPECIAL_PAYLOAD flag needs to use this helper to
 * calculate the data transfer size.
 */
static inline unsigned int blk_rq_payload_bytes(struct request *rq)
{
	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
		return rq->special_vec.bv_len;
	return blk_rq_bytes(rq);
}

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/*
 * Return the first full biovec in the request.  The caller needs to check that
 * there are any bvecs before calling this helper.
 */
static inline struct bio_vec req_bvec(struct request *rq)
{
	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
		return rq->special_vec;
	return mp_bvec_iter_bvec(rq->bio->bi_io_vec, rq->bio->bi_iter);
}

990
static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
991
						     int op)
992
{
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Adrian Hunter 已提交
993
	if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
994 995
		return min(q->limits.max_discard_sectors,
			   UINT_MAX >> SECTOR_SHIFT);
996

997
	if (unlikely(op == REQ_OP_WRITE_SAME))
998 999
		return q->limits.max_write_same_sectors;

1000 1001 1002
	if (unlikely(op == REQ_OP_WRITE_ZEROES))
		return q->limits.max_write_zeroes_sectors;

1003 1004 1005
	return q->limits.max_sectors;
}

1006 1007 1008 1009 1010 1011 1012 1013
/*
 * Return maximum size of a request at given offset. Only valid for
 * file system requests.
 */
static inline unsigned int blk_max_size_offset(struct request_queue *q,
					       sector_t offset)
{
	if (!q->limits.chunk_sectors)
1014
		return q->limits.max_sectors;
1015

1016 1017
	return min(q->limits.max_sectors, (unsigned int)(q->limits.chunk_sectors -
			(offset & (q->limits.chunk_sectors - 1))));
1018 1019
}

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static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
						  sector_t offset)
1022 1023 1024
{
	struct request_queue *q = rq->q;

1025
	if (blk_rq_is_passthrough(rq))
1026 1027
		return q->limits.max_hw_sectors;

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1028 1029 1030
	if (!q->limits.chunk_sectors ||
	    req_op(rq) == REQ_OP_DISCARD ||
	    req_op(rq) == REQ_OP_SECURE_ERASE)
1031
		return blk_queue_get_max_sectors(q, req_op(rq));
1032

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1033
	return min(blk_max_size_offset(q, offset),
1034
			blk_queue_get_max_sectors(q, req_op(rq)));
1035 1036
}

1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047
static inline unsigned int blk_rq_count_bios(struct request *rq)
{
	unsigned int nr_bios = 0;
	struct bio *bio;

	__rq_for_each_bio(bio, rq)
		nr_bios++;

	return nr_bios;
}

1048 1049
void blk_steal_bios(struct bio_list *list, struct request *rq);

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/*
1051 1052 1053 1054
 * Request completion related functions.
 *
 * blk_update_request() completes given number of bytes and updates
 * the request without completing it.
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 */
1056
extern bool blk_update_request(struct request *rq, blk_status_t error,
1057 1058
			       unsigned int nr_bytes);

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extern void __blk_complete_request(struct request *);
extern void blk_abort_request(struct request *);
1061

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/*
 * Access functions for manipulating queue properties
 */
1065 1066 1067
extern void blk_cleanup_queue(struct request_queue *);
extern void blk_queue_make_request(struct request_queue *, make_request_fn *);
extern void blk_queue_bounce_limit(struct request_queue *, u64);
1068
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
1069
extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
1070
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
1071 1072
extern void blk_queue_max_discard_segments(struct request_queue *,
		unsigned short);
1073
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
1074 1075
extern void blk_queue_max_discard_sectors(struct request_queue *q,
		unsigned int max_discard_sectors);
1076 1077
extern void blk_queue_max_write_same_sectors(struct request_queue *q,
		unsigned int max_write_same_sectors);
1078 1079
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
		unsigned int max_write_same_sectors);
1080
extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
1081
extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
1082 1083
extern void blk_queue_alignment_offset(struct request_queue *q,
				       unsigned int alignment);
1084
extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
1085
extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
1086
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
1087
extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
1088
extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
1089
extern void blk_set_default_limits(struct queue_limits *lim);
1090
extern void blk_set_stacking_limits(struct queue_limits *lim);
1091 1092
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
			    sector_t offset);
1093 1094
extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
			    sector_t offset);
1095 1096
extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
			      sector_t offset);
1097
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
1098
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
1099 1100 1101
extern int blk_queue_dma_drain(struct request_queue *q,
			       dma_drain_needed_fn *dma_drain_needed,
			       void *buf, unsigned int size);
1102
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
1103
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
1104
extern void blk_queue_dma_alignment(struct request_queue *, int);
1105
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
J
Jens Axboe 已提交
1106
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
1107
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
1108 1109
extern void blk_queue_required_elevator_features(struct request_queue *q,
						 unsigned int features);
1110 1111
extern bool blk_queue_can_use_dma_map_merging(struct request_queue *q,
					      struct device *dev);
L
Linus Torvalds 已提交
1112

1113 1114 1115 1116 1117 1118 1119 1120 1121
/*
 * Number of physical segments as sent to the device.
 *
 * Normally this is the number of discontiguous data segments sent by the
 * submitter.  But for data-less command like discard we might have no
 * actual data segments submitted, but the driver might have to add it's
 * own special payload.  In that case we still return 1 here so that this
 * special payload will be mapped.
 */
1122 1123 1124 1125 1126 1127 1128
static inline unsigned short blk_rq_nr_phys_segments(struct request *rq)
{
	if (rq->rq_flags & RQF_SPECIAL_PAYLOAD)
		return 1;
	return rq->nr_phys_segments;
}

1129 1130 1131 1132 1133 1134 1135 1136 1137
/*
 * Number of discard segments (or ranges) the driver needs to fill in.
 * Each discard bio merged into a request is counted as one segment.
 */
static inline unsigned short blk_rq_nr_discard_segments(struct request *rq)
{
	return max_t(unsigned short, rq->nr_phys_segments, 1);
}

1138
extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
L
Linus Torvalds 已提交
1139 1140 1141
extern void blk_dump_rq_flags(struct request *, char *);
extern long nr_blockdev_pages(void);

T
Tejun Heo 已提交
1142
bool __must_check blk_get_queue(struct request_queue *);
1143
struct request_queue *blk_alloc_queue(gfp_t);
1144
struct request_queue *blk_alloc_queue_node(gfp_t gfp_mask, int node_id);
1145
extern void blk_put_queue(struct request_queue *);
1146
extern void blk_set_queue_dying(struct request_queue *);
L
Linus Torvalds 已提交
1147

1148
/*
S
Suresh Jayaraman 已提交
1149 1150 1151 1152 1153 1154 1155 1156 1157 1158
 * blk_plug permits building a queue of related requests by holding the I/O
 * fragments for a short period. This allows merging of sequential requests
 * into single larger request. As the requests are moved from a per-task list to
 * the device's request_queue in a batch, this results in improved scalability
 * as the lock contention for request_queue lock is reduced.
 *
 * It is ok not to disable preemption when adding the request to the plug list
 * or when attempting a merge, because blk_schedule_flush_list() will only flush
 * the plug list when the task sleeps by itself. For details, please see
 * schedule() where blk_schedule_flush_plug() is called.
1159
 */
1160
struct blk_plug {
1161
	struct list_head mq_list; /* blk-mq requests */
S
Suresh Jayaraman 已提交
1162
	struct list_head cb_list; /* md requires an unplug callback */
1163
	unsigned short rq_count;
1164
	bool multiple_queues;
1165
};
1166
#define BLK_MAX_REQUEST_COUNT 16
1167
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
1168

1169
struct blk_plug_cb;
1170
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
1171 1172
struct blk_plug_cb {
	struct list_head list;
1173 1174
	blk_plug_cb_fn callback;
	void *data;
1175
};
1176 1177
extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
					     void *data, int size);
1178 1179
extern void blk_start_plug(struct blk_plug *);
extern void blk_finish_plug(struct blk_plug *);
1180
extern void blk_flush_plug_list(struct blk_plug *, bool);
1181 1182 1183 1184 1185

static inline void blk_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

1186 1187 1188 1189 1190 1191 1192 1193
	if (plug)
		blk_flush_plug_list(plug, false);
}

static inline void blk_schedule_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

1194
	if (plug)
1195
		blk_flush_plug_list(plug, true);
1196 1197 1198 1199 1200 1201
}

static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
	struct blk_plug *plug = tsk->plug;

1202
	return plug &&
J
Jens Axboe 已提交
1203
		 (!list_empty(&plug->mq_list) ||
1204
		 !list_empty(&plug->cb_list));
1205 1206
}

1207 1208 1209
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, struct page *page);
1210 1211

#define BLKDEV_DISCARD_SECURE	(1 << 0)	/* issue a secure erase */
1212

1213 1214
extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
1215
extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
1216
		sector_t nr_sects, gfp_t gfp_mask, int flags,
1217
		struct bio **biop);
1218 1219

#define BLKDEV_ZERO_NOUNMAP	(1 << 0)  /* do not free blocks */
1220
#define BLKDEV_ZERO_NOFALLBACK	(1 << 1)  /* don't write explicit zeroes */
1221

1222 1223
extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
		sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
1224
		unsigned flags);
1225
extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
1226 1227
		sector_t nr_sects, gfp_t gfp_mask, unsigned flags);

1228 1229
static inline int sb_issue_discard(struct super_block *sb, sector_t block,
		sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
D
David Woodhouse 已提交
1230
{
1231 1232 1233 1234 1235
	return blkdev_issue_discard(sb->s_bdev,
				    block << (sb->s_blocksize_bits -
					      SECTOR_SHIFT),
				    nr_blocks << (sb->s_blocksize_bits -
						  SECTOR_SHIFT),
1236
				    gfp_mask, flags);
D
David Woodhouse 已提交
1237
}
1238
static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
1239
		sector_t nr_blocks, gfp_t gfp_mask)
1240 1241
{
	return blkdev_issue_zeroout(sb->s_bdev,
1242 1243 1244 1245
				    block << (sb->s_blocksize_bits -
					      SECTOR_SHIFT),
				    nr_blocks << (sb->s_blocksize_bits -
						  SECTOR_SHIFT),
1246
				    gfp_mask, 0);
1247
}
L
Linus Torvalds 已提交
1248

1249
extern int blk_verify_command(unsigned char *cmd, fmode_t mode);
1250

1251 1252 1253
enum blk_default_limits {
	BLK_MAX_SEGMENTS	= 128,
	BLK_SAFE_MAX_SECTORS	= 255,
1254
	BLK_DEF_MAX_SECTORS	= 2560,
1255 1256 1257
	BLK_MAX_SEGMENT_SIZE	= 65536,
	BLK_SEG_BOUNDARY_MASK	= 0xFFFFFFFFUL,
};
1258

1259
static inline unsigned long queue_segment_boundary(const struct request_queue *q)
1260
{
1261
	return q->limits.seg_boundary_mask;
1262 1263
}

1264
static inline unsigned long queue_virt_boundary(const struct request_queue *q)
1265 1266 1267 1268
{
	return q->limits.virt_boundary_mask;
}

1269
static inline unsigned int queue_max_sectors(const struct request_queue *q)
1270
{
1271
	return q->limits.max_sectors;
1272 1273
}

1274
static inline unsigned int queue_max_hw_sectors(const struct request_queue *q)
1275
{
1276
	return q->limits.max_hw_sectors;
1277 1278
}

1279
static inline unsigned short queue_max_segments(const struct request_queue *q)
1280
{
1281
	return q->limits.max_segments;
1282 1283
}

1284
static inline unsigned short queue_max_discard_segments(const struct request_queue *q)
1285 1286 1287 1288
{
	return q->limits.max_discard_segments;
}

1289
static inline unsigned int queue_max_segment_size(const struct request_queue *q)
1290
{
1291
	return q->limits.max_segment_size;
1292 1293
}

1294
static inline unsigned short queue_logical_block_size(const struct request_queue *q)
L
Linus Torvalds 已提交
1295 1296 1297
{
	int retval = 512;

1298 1299
	if (q && q->limits.logical_block_size)
		retval = q->limits.logical_block_size;
L
Linus Torvalds 已提交
1300 1301 1302 1303

	return retval;
}

1304
static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
L
Linus Torvalds 已提交
1305
{
1306
	return queue_logical_block_size(bdev_get_queue(bdev));
L
Linus Torvalds 已提交
1307 1308
}

1309
static inline unsigned int queue_physical_block_size(const struct request_queue *q)
1310 1311 1312 1313
{
	return q->limits.physical_block_size;
}

1314
static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
M
Martin K. Petersen 已提交
1315 1316 1317 1318
{
	return queue_physical_block_size(bdev_get_queue(bdev));
}

1319
static inline unsigned int queue_io_min(const struct request_queue *q)
1320 1321 1322 1323
{
	return q->limits.io_min;
}

M
Martin K. Petersen 已提交
1324 1325 1326 1327 1328
static inline int bdev_io_min(struct block_device *bdev)
{
	return queue_io_min(bdev_get_queue(bdev));
}

1329
static inline unsigned int queue_io_opt(const struct request_queue *q)
1330 1331 1332 1333
{
	return q->limits.io_opt;
}

M
Martin K. Petersen 已提交
1334 1335 1336 1337 1338
static inline int bdev_io_opt(struct block_device *bdev)
{
	return queue_io_opt(bdev_get_queue(bdev));
}

1339
static inline int queue_alignment_offset(const struct request_queue *q)
1340
{
M
Martin K. Petersen 已提交
1341
	if (q->limits.misaligned)
1342 1343
		return -1;

M
Martin K. Petersen 已提交
1344
	return q->limits.alignment_offset;
1345 1346
}

1347
static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
1348 1349
{
	unsigned int granularity = max(lim->physical_block_size, lim->io_min);
1350 1351
	unsigned int alignment = sector_div(sector, granularity >> SECTOR_SHIFT)
		<< SECTOR_SHIFT;
1352

1353
	return (granularity + lim->alignment_offset - alignment) % granularity;
1354 1355
}

M
Martin K. Petersen 已提交
1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368
static inline int bdev_alignment_offset(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q->limits.misaligned)
		return -1;

	if (bdev != bdev->bd_contains)
		return bdev->bd_part->alignment_offset;

	return q->limits.alignment_offset;
}

1369
static inline int queue_discard_alignment(const struct request_queue *q)
1370 1371 1372 1373 1374 1375 1376
{
	if (q->limits.discard_misaligned)
		return -1;

	return q->limits.discard_alignment;
}

1377
static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
1378
{
1379
	unsigned int alignment, granularity, offset;
1380

1381 1382 1383
	if (!lim->max_discard_sectors)
		return 0;

1384
	/* Why are these in bytes, not sectors? */
1385 1386
	alignment = lim->discard_alignment >> SECTOR_SHIFT;
	granularity = lim->discard_granularity >> SECTOR_SHIFT;
1387 1388 1389 1390 1391 1392 1393 1394 1395 1396
	if (!granularity)
		return 0;

	/* Offset of the partition start in 'granularity' sectors */
	offset = sector_div(sector, granularity);

	/* And why do we do this modulus *again* in blkdev_issue_discard()? */
	offset = (granularity + alignment - offset) % granularity;

	/* Turn it back into bytes, gaah */
1397
	return offset << SECTOR_SHIFT;
1398 1399
}

1400 1401 1402 1403 1404 1405 1406 1407 1408 1409
static inline int bdev_discard_alignment(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (bdev != bdev->bd_contains)
		return bdev->bd_part->discard_alignment;

	return q->limits.discard_alignment;
}

1410 1411 1412 1413 1414 1415 1416 1417 1418 1419
static inline unsigned int bdev_write_same(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q)
		return q->limits.max_write_same_sectors;

	return 0;
}

1420 1421 1422 1423 1424 1425 1426 1427 1428 1429
static inline unsigned int bdev_write_zeroes_sectors(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q)
		return q->limits.max_write_zeroes_sectors;

	return 0;
}

D
Damien Le Moal 已提交
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449
static inline enum blk_zoned_model bdev_zoned_model(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q)
		return blk_queue_zoned_model(q);

	return BLK_ZONED_NONE;
}

static inline bool bdev_is_zoned(struct block_device *bdev)
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q)
		return blk_queue_is_zoned(q);

	return false;
}

1450
static inline sector_t bdev_zone_sectors(struct block_device *bdev)
1451 1452 1453 1454
{
	struct request_queue *q = bdev_get_queue(bdev);

	if (q)
1455
		return blk_queue_zone_sectors(q);
1456 1457
	return 0;
}
1458

1459
static inline int queue_dma_alignment(const struct request_queue *q)
L
Linus Torvalds 已提交
1460
{
1461
	return q ? q->dma_alignment : 511;
L
Linus Torvalds 已提交
1462 1463
}

1464
static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
1465 1466 1467
				 unsigned int len)
{
	unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
1468
	return !(addr & alignment) && !(len & alignment);
1469 1470
}

L
Linus Torvalds 已提交
1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481
/* assumes size > 256 */
static inline unsigned int blksize_bits(unsigned int size)
{
	unsigned int bits = 8;
	do {
		bits++;
		size >>= 1;
	} while (size > 256);
	return bits;
}

1482
static inline unsigned int block_size(struct block_device *bdev)
L
Linus Torvalds 已提交
1483 1484 1485 1486 1487 1488 1489 1490 1491 1492
{
	return bdev->bd_block_size;
}

typedef struct {struct page *v;} Sector;

unsigned char *read_dev_sector(struct block_device *, sector_t, Sector *);

static inline void put_dev_sector(Sector p)
{
1493
	put_page(p.v);
L
Linus Torvalds 已提交
1494 1495
}

1496
int kblockd_schedule_work(struct work_struct *work);
1497
int kblockd_schedule_work_on(int cpu, struct work_struct *work);
1498
int kblockd_mod_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
L
Linus Torvalds 已提交
1499 1500 1501 1502 1503 1504

#define MODULE_ALIAS_BLOCKDEV(major,minor) \
	MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
	MODULE_ALIAS("block-major-" __stringify(major) "-*")

1505 1506
#if defined(CONFIG_BLK_DEV_INTEGRITY)

1507 1508 1509
enum blk_integrity_flags {
	BLK_INTEGRITY_VERIFY		= 1 << 0,
	BLK_INTEGRITY_GENERATE		= 1 << 1,
1510
	BLK_INTEGRITY_DEVICE_CAPABLE	= 1 << 2,
1511
	BLK_INTEGRITY_IP_CHECKSUM	= 1 << 3,
1512
};
1513

1514
struct blk_integrity_iter {
1515 1516
	void			*prot_buf;
	void			*data_buf;
1517
	sector_t		seed;
1518
	unsigned int		data_size;
1519
	unsigned short		interval;
1520 1521 1522
	const char		*disk_name;
};

1523
typedef blk_status_t (integrity_processing_fn) (struct blk_integrity_iter *);
1524 1525
typedef void (integrity_prepare_fn) (struct request *);
typedef void (integrity_complete_fn) (struct request *, unsigned int);
1526

1527 1528 1529
struct blk_integrity_profile {
	integrity_processing_fn		*generate_fn;
	integrity_processing_fn		*verify_fn;
1530 1531
	integrity_prepare_fn		*prepare_fn;
	integrity_complete_fn		*complete_fn;
1532 1533
	const char			*name;
};
1534

1535
extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
1536
extern void blk_integrity_unregister(struct gendisk *);
1537
extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
1538 1539 1540
extern int blk_rq_map_integrity_sg(struct request_queue *, struct bio *,
				   struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request_queue *, struct bio *);
1541 1542 1543 1544
extern bool blk_integrity_merge_rq(struct request_queue *, struct request *,
				   struct request *);
extern bool blk_integrity_merge_bio(struct request_queue *, struct request *,
				    struct bio *);
1545

1546
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
1547
{
1548
	struct blk_integrity *bi = &disk->queue->integrity;
1549 1550 1551 1552 1553

	if (!bi->profile)
		return NULL;

	return bi;
1554 1555
}

1556 1557
static inline
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
1558
{
1559
	return blk_get_integrity(bdev->bd_disk);
1560 1561
}

1562
static inline bool blk_integrity_rq(struct request *rq)
1563
{
1564
	return rq->cmd_flags & REQ_INTEGRITY;
1565 1566
}

1567 1568 1569 1570 1571 1572 1573
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
						    unsigned int segs)
{
	q->limits.max_integrity_segments = segs;
}

static inline unsigned short
1574
queue_max_integrity_segments(const struct request_queue *q)
1575 1576 1577 1578
{
	return q->limits.max_integrity_segments;
}

1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600
/**
 * bio_integrity_intervals - Return number of integrity intervals for a bio
 * @bi:		blk_integrity profile for device
 * @sectors:	Size of the bio in 512-byte sectors
 *
 * Description: The block layer calculates everything in 512 byte
 * sectors but integrity metadata is done in terms of the data integrity
 * interval size of the storage device.  Convert the block layer sectors
 * to the appropriate number of integrity intervals.
 */
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
						   unsigned int sectors)
{
	return sectors >> (bi->interval_exp - 9);
}

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{
	return bio_integrity_intervals(bi, sectors) * bi->tuple_size;
}

1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611
/*
 * Return the first bvec that contains integrity data.  Only drivers that are
 * limited to a single integrity segment should use this helper.
 */
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
	if (WARN_ON_ONCE(queue_max_integrity_segments(rq->q) > 1))
		return NULL;
	return rq->bio->bi_integrity->bip_vec;
}

1612 1613
#else /* CONFIG_BLK_DEV_INTEGRITY */

1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635
struct bio;
struct block_device;
struct gendisk;
struct blk_integrity;

static inline int blk_integrity_rq(struct request *rq)
{
	return 0;
}
static inline int blk_rq_count_integrity_sg(struct request_queue *q,
					    struct bio *b)
{
	return 0;
}
static inline int blk_rq_map_integrity_sg(struct request_queue *q,
					  struct bio *b,
					  struct scatterlist *s)
{
	return 0;
}
static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
{
1636
	return NULL;
1637 1638 1639 1640 1641 1642 1643 1644 1645
}
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
	return NULL;
}
static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
{
	return 0;
}
1646
static inline void blk_integrity_register(struct gendisk *d,
1647 1648 1649 1650 1651 1652 1653 1654 1655 1656
					 struct blk_integrity *b)
{
}
static inline void blk_integrity_unregister(struct gendisk *d)
{
}
static inline void blk_queue_max_integrity_segments(struct request_queue *q,
						    unsigned int segs)
{
}
1657
static inline unsigned short queue_max_integrity_segments(const struct request_queue *q)
1658 1659 1660
{
	return 0;
}
1661 1662 1663
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
					  struct request *r1,
					  struct request *r2)
1664
{
1665
	return true;
1666
}
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static inline bool blk_integrity_merge_bio(struct request_queue *rq,
					   struct request *r,
					   struct bio *b)
1670
{
1671
	return true;
1672
}
1673

1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685
static inline unsigned int bio_integrity_intervals(struct blk_integrity *bi,
						   unsigned int sectors)
{
	return 0;
}

static inline unsigned int bio_integrity_bytes(struct blk_integrity *bi,
					       unsigned int sectors)
{
	return 0;
}

1686 1687 1688 1689 1690
static inline struct bio_vec *rq_integrity_vec(struct request *rq)
{
	return NULL;
}

1691 1692
#endif /* CONFIG_BLK_DEV_INTEGRITY */

1693
struct block_device_operations {
A
Al Viro 已提交
1694
	int (*open) (struct block_device *, fmode_t);
1695
	void (*release) (struct gendisk *, fmode_t);
1696
	int (*rw_page)(struct block_device *, sector_t, struct page *, unsigned int);
A
Al Viro 已提交
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	int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
	int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
1699 1700 1701
	unsigned int (*check_events) (struct gendisk *disk,
				      unsigned int clearing);
	/* ->media_changed() is DEPRECATED, use ->check_events() instead */
1702
	int (*media_changed) (struct gendisk *);
1703
	void (*unlock_native_capacity) (struct gendisk *);
1704 1705
	int (*revalidate_disk) (struct gendisk *);
	int (*getgeo)(struct block_device *, struct hd_geometry *);
1706 1707
	/* this callback is with swap_lock and sometimes page table lock held */
	void (*swap_slot_free_notify) (struct block_device *, unsigned long);
1708
	int (*report_zones)(struct gendisk *, sector_t sector,
C
Christoph Hellwig 已提交
1709
			unsigned int nr_zones, report_zones_cb cb, void *data);
1710
	struct module *owner;
1711
	const struct pr_ops *pr_ops;
1712 1713
};

1714 1715
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
				 unsigned long);
1716 1717 1718
extern int bdev_read_page(struct block_device *, sector_t, struct page *);
extern int bdev_write_page(struct block_device *, sector_t, struct page *,
						struct writeback_control *);
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#ifdef CONFIG_BLK_DEV_ZONED
bool blk_req_needs_zone_write_lock(struct request *rq);
void __blk_req_zone_write_lock(struct request *rq);
void __blk_req_zone_write_unlock(struct request *rq);

static inline void blk_req_zone_write_lock(struct request *rq)
{
	if (blk_req_needs_zone_write_lock(rq))
		__blk_req_zone_write_lock(rq);
}

static inline void blk_req_zone_write_unlock(struct request *rq)
{
	if (rq->rq_flags & RQF_ZONE_WRITE_LOCKED)
		__blk_req_zone_write_unlock(rq);
}

static inline bool blk_req_zone_is_write_locked(struct request *rq)
{
	return rq->q->seq_zones_wlock &&
		test_bit(blk_rq_zone_no(rq), rq->q->seq_zones_wlock);
}

static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
{
	if (!blk_req_needs_zone_write_lock(rq))
		return true;
	return !blk_req_zone_is_write_locked(rq);
}
#else
static inline bool blk_req_needs_zone_write_lock(struct request *rq)
{
	return false;
}

static inline void blk_req_zone_write_lock(struct request *rq)
{
}

static inline void blk_req_zone_write_unlock(struct request *rq)
{
}
static inline bool blk_req_zone_is_write_locked(struct request *rq)
{
	return false;
}

static inline bool blk_req_can_dispatch_to_zone(struct request *rq)
{
	return true;
}
#endif /* CONFIG_BLK_DEV_ZONED */

1773
#else /* CONFIG_BLOCK */
1774 1775 1776

struct block_device;

1777 1778 1779 1780 1781 1782 1783 1784 1785 1786
/*
 * stubs for when the block layer is configured out
 */
#define buffer_heads_over_limit 0

static inline long nr_blockdev_pages(void)
{
	return 0;
}

1787 1788 1789 1790
struct blk_plug {
};

static inline void blk_start_plug(struct blk_plug *plug)
1791 1792 1793
{
}

1794
static inline void blk_finish_plug(struct blk_plug *plug)
1795 1796 1797
{
}

1798
static inline void blk_flush_plug(struct task_struct *task)
1799 1800 1801
{
}

1802 1803 1804 1805 1806
static inline void blk_schedule_flush_plug(struct task_struct *task)
{
}


1807 1808 1809 1810 1811
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
{
	return false;
}

1812 1813 1814 1815 1816 1817
static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
				     sector_t *error_sector)
{
	return 0;
}

1818 1819
#endif /* CONFIG_BLOCK */

J
Jens Axboe 已提交
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static inline void blk_wake_io_task(struct task_struct *waiter)
{
	/*
	 * If we're polling, the task itself is doing the completions. For
	 * that case, we don't need to signal a wakeup, it's enough to just
	 * mark us as RUNNING.
	 */
	if (waiter == current)
		__set_current_state(TASK_RUNNING);
	else
		wake_up_process(waiter);
}

L
Linus Torvalds 已提交
1833
#endif