mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 08:02:30 +00:00
f8a5b12247
We never change it, make that clear. Signed-off-by: Jens Axboe <axboe@fb.com> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
1962 lines
56 KiB
C
1962 lines
56 KiB
C
#ifndef _LINUX_BLKDEV_H
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#define _LINUX_BLKDEV_H
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#include <linux/sched.h>
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#ifdef CONFIG_BLOCK
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#include <linux/major.h>
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#include <linux/genhd.h>
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#include <linux/list.h>
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#include <linux/llist.h>
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#include <linux/timer.h>
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#include <linux/workqueue.h>
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#include <linux/pagemap.h>
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#include <linux/backing-dev-defs.h>
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#include <linux/wait.h>
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#include <linux/mempool.h>
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#include <linux/pfn.h>
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#include <linux/bio.h>
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#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;
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struct elevator_queue;
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struct blk_trace;
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struct request;
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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_wb;
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#define BLKDEV_MIN_RQ 4
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#define BLKDEV_MAX_RQ 128 /* Default maximum */
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/*
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* Maximum number of blkcg policies allowed to be registered concurrently.
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* Defined here to simplify include dependency.
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*/
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#define BLKCG_MAX_POLS 2
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typedef void (rq_end_io_fn)(struct request *, int);
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#define BLK_RL_SYNCFULL (1U << 0)
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#define BLK_RL_ASYNCFULL (1U << 1)
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struct request_list {
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struct request_queue *q; /* the queue this rl belongs to */
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#ifdef CONFIG_BLK_CGROUP
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struct blkcg_gq *blkg; /* blkg this request pool belongs to */
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#endif
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/*
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* count[], starved[], and wait[] are indexed by
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* BLK_RW_SYNC/BLK_RW_ASYNC
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*/
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int count[2];
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int starved[2];
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mempool_t *rq_pool;
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wait_queue_head_t wait[2];
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unsigned int flags;
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};
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/*
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* request command types
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*/
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enum rq_cmd_type_bits {
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REQ_TYPE_FS = 1, /* fs request */
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REQ_TYPE_BLOCK_PC, /* scsi command */
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REQ_TYPE_DRV_PRIV, /* driver defined types from here */
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};
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/*
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* request flags */
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typedef __u32 __bitwise req_flags_t;
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/* elevator knows about this request */
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#define RQF_SORTED ((__force req_flags_t)(1 << 0))
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/* drive already may have started this one */
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#define RQF_STARTED ((__force req_flags_t)(1 << 1))
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/* uses tagged queueing */
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#define RQF_QUEUED ((__force req_flags_t)(1 << 2))
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/* may not be passed by ioscheduler */
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#define RQF_SOFTBARRIER ((__force req_flags_t)(1 << 3))
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/* request for flush sequence */
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#define RQF_FLUSH_SEQ ((__force req_flags_t)(1 << 4))
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/* merge of different types, fail separately */
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#define RQF_MIXED_MERGE ((__force req_flags_t)(1 << 5))
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/* track inflight for MQ */
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#define RQF_MQ_INFLIGHT ((__force req_flags_t)(1 << 6))
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/* don't call prep for this one */
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#define RQF_DONTPREP ((__force req_flags_t)(1 << 7))
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/* set for "ide_preempt" requests and also for requests for which the SCSI
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"quiesce" state must be ignored. */
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#define RQF_PREEMPT ((__force req_flags_t)(1 << 8))
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/* contains copies of user pages */
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#define RQF_COPY_USER ((__force req_flags_t)(1 << 9))
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/* vaguely specified driver internal error. Ignored by the block layer */
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#define RQF_FAILED ((__force req_flags_t)(1 << 10))
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/* don't warn about errors */
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#define RQF_QUIET ((__force req_flags_t)(1 << 11))
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/* elevator private data attached */
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#define RQF_ELVPRIV ((__force req_flags_t)(1 << 12))
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/* account I/O stat */
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#define RQF_IO_STAT ((__force req_flags_t)(1 << 13))
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/* request came from our alloc pool */
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#define RQF_ALLOCED ((__force req_flags_t)(1 << 14))
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/* runtime pm request */
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#define RQF_PM ((__force req_flags_t)(1 << 15))
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/* on IO scheduler merge hash */
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#define RQF_HASHED ((__force req_flags_t)(1 << 16))
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/* IO stats tracking on */
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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
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bio chain. */
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#define RQF_SPECIAL_PAYLOAD ((__force req_flags_t)(1 << 18))
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/* flags that prevent us from merging requests: */
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#define RQF_NOMERGE_FLAGS \
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(RQF_STARTED | RQF_SOFTBARRIER | RQF_FLUSH_SEQ | RQF_SPECIAL_PAYLOAD)
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#define BLK_MAX_CDB 16
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/*
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* Try to put the fields that are referenced together in the same cacheline.
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*
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* If you modify this structure, make sure to update blk_rq_init() and
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* especially blk_mq_rq_ctx_init() to take care of the added fields.
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*/
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struct request {
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struct list_head queuelist;
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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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struct request_queue *q;
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struct blk_mq_ctx *mq_ctx;
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int cpu;
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unsigned cmd_type;
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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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unsigned long atomic_flags;
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/* the following two fields are internal, NEVER access directly */
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unsigned int __data_len; /* total data len */
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sector_t __sector; /* sector cursor */
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struct bio *bio;
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struct bio *biotail;
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/*
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* The hash is used inside the scheduler, and killed once the
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* request reaches the dispatch list. The ipi_list is only used
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* to queue the request for softirq completion, which is long
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* after the request has been unhashed (and even removed from
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* the dispatch list).
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*/
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union {
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struct hlist_node hash; /* merge hash */
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struct list_head ipi_list;
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};
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/*
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* The rb_node is only used inside the io scheduler, requests
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* 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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*/
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union {
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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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};
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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
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* 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 {
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struct io_cq *icq;
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void *priv[2];
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} elv;
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struct {
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unsigned int seq;
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struct list_head list;
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rq_end_io_fn *saved_end_io;
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} flush;
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};
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struct gendisk *rq_disk;
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struct hd_struct *part;
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unsigned long start_time;
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struct blk_issue_stat issue_stat;
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#ifdef CONFIG_BLK_CGROUP
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struct request_list *rl; /* rl this rq is alloced from */
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unsigned long long start_time_ns;
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unsigned long long io_start_time_ns; /* when passed to hardware */
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#endif
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/* Number of scatter-gather DMA addr+len pairs after
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* physical address coalescing is performed.
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*/
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unsigned short nr_phys_segments;
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#if defined(CONFIG_BLK_DEV_INTEGRITY)
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unsigned short nr_integrity_segments;
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#endif
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unsigned short ioprio;
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void *special; /* opaque pointer available for LLD use */
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int tag;
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int errors;
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/*
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* when request is used as a packet command carrier
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*/
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unsigned char __cmd[BLK_MAX_CDB];
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unsigned char *cmd;
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unsigned short cmd_len;
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unsigned int extra_len; /* length of alignment and padding */
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unsigned int sense_len;
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unsigned int resid_len; /* residual count */
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void *sense;
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unsigned long deadline;
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struct list_head timeout_list;
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unsigned int timeout;
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int retries;
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/*
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* completion callback.
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*/
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rq_end_io_fn *end_io;
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void *end_io_data;
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/* for bidi */
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struct request *next_rq;
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};
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static inline unsigned short req_get_ioprio(struct request *req)
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{
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return req->ioprio;
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}
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#include <linux/elevator.h>
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struct blk_queue_ctx;
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typedef void (request_fn_proc) (struct request_queue *q);
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typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio);
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typedef int (prep_rq_fn) (struct request_queue *, struct request *);
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typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
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struct bio_vec;
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typedef void (softirq_done_fn)(struct request *);
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typedef int (dma_drain_needed_fn)(struct request *);
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typedef int (lld_busy_fn) (struct request_queue *q);
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typedef int (bsg_job_fn) (struct bsg_job *);
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enum blk_eh_timer_return {
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BLK_EH_NOT_HANDLED,
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BLK_EH_HANDLED,
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BLK_EH_RESET_TIMER,
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};
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typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
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enum blk_queue_state {
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Queue_down,
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Queue_up,
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};
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struct blk_queue_tag {
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struct request **tag_index; /* map of busy tags */
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unsigned long *tag_map; /* bit map of free/busy tags */
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int max_depth; /* what we will send to device */
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int real_max_depth; /* what the array can hold */
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atomic_t refcnt; /* map can be shared */
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int alloc_policy; /* tag allocation policy */
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int next_tag; /* next tag */
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};
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#define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */
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#define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */
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#define BLK_SCSI_MAX_CMDS (256)
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#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
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/*
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* Zoned block device models (zoned limit).
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*/
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enum blk_zoned_model {
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BLK_ZONED_NONE, /* Regular block device */
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BLK_ZONED_HA, /* Host-aware zoned block device */
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BLK_ZONED_HM, /* Host-managed zoned block device */
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};
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struct queue_limits {
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unsigned long bounce_pfn;
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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;
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unsigned int max_segment_size;
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unsigned int physical_block_size;
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unsigned int alignment_offset;
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unsigned int io_min;
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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;
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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 char misaligned;
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unsigned char discard_misaligned;
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unsigned char cluster;
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unsigned char discard_zeroes_data;
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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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#ifdef CONFIG_BLK_DEV_ZONED
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struct blk_zone_report_hdr {
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unsigned int nr_zones;
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u8 padding[60];
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};
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extern int blkdev_report_zones(struct block_device *bdev,
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sector_t sector, struct blk_zone *zones,
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unsigned int *nr_zones, gfp_t gfp_mask);
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extern int blkdev_reset_zones(struct block_device *bdev, sector_t sectors,
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sector_t nr_sectors, gfp_t gfp_mask);
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extern int blkdev_report_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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extern int blkdev_reset_zones_ioctl(struct block_device *bdev, fmode_t mode,
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unsigned int cmd, unsigned long arg);
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#else /* CONFIG_BLK_DEV_ZONED */
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static inline int blkdev_report_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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static inline int blkdev_reset_zones_ioctl(struct block_device *bdev,
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fmode_t mode, unsigned int cmd,
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unsigned long arg)
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{
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return -ENOTTY;
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}
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#endif /* CONFIG_BLK_DEV_ZONED */
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struct request_queue {
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/*
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* Together with queue_head for cacheline sharing
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*/
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struct list_head queue_head;
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struct request *last_merge;
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struct elevator_queue *elevator;
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int nr_rqs[2]; /* # allocated [a]sync rqs */
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int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */
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struct rq_wb *rq_wb;
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/*
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* If blkcg is not used, @q->root_rl serves all requests. If blkcg
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* is used, root blkg allocates from @q->root_rl and all other
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* blkgs from their own blkg->rl. Which one to use should be
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* determined using bio_request_list().
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*/
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struct request_list root_rl;
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request_fn_proc *request_fn;
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make_request_fn *make_request_fn;
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prep_rq_fn *prep_rq_fn;
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unprep_rq_fn *unprep_rq_fn;
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softirq_done_fn *softirq_done_fn;
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rq_timed_out_fn *rq_timed_out_fn;
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dma_drain_needed_fn *dma_drain_needed;
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lld_busy_fn *lld_busy_fn;
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const struct blk_mq_ops *mq_ops;
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unsigned int *mq_map;
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/* sw queues */
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struct blk_mq_ctx __percpu *queue_ctx;
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unsigned int nr_queues;
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unsigned int queue_depth;
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/* hw dispatch queues */
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struct blk_mq_hw_ctx **queue_hw_ctx;
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unsigned int nr_hw_queues;
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/*
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* Dispatch queue sorting
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*/
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sector_t end_sector;
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struct request *boundary_rq;
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/*
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* Delayed queue handling
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*/
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struct delayed_work delay_work;
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struct backing_dev_info backing_dev_info;
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/*
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* The queue owner gets to use this for whatever they like.
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* ll_rw_blk doesn't touch it.
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*/
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void *queuedata;
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/*
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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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/*
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* ida allocated id for this queue. Used to index queues from
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* ioctx.
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*/
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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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/*
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* protects queue structures from reentrancy. ->__queue_lock should
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* _never_ be used directly, it is queue private. always use
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* ->queue_lock.
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*/
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spinlock_t __queue_lock;
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spinlock_t *queue_lock;
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/*
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* queue kobject
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*/
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struct kobject kobj;
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/*
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* mq queue kobject
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*/
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struct kobject mq_kobj;
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#ifdef CONFIG_BLK_DEV_INTEGRITY
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struct blk_integrity integrity;
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#endif /* CONFIG_BLK_DEV_INTEGRITY */
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#ifdef CONFIG_PM
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struct device *dev;
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int rpm_status;
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unsigned int nr_pending;
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#endif
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/*
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* queue settings
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*/
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unsigned long nr_requests; /* Max # of requests */
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unsigned int nr_congestion_on;
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unsigned int nr_congestion_off;
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unsigned int nr_batching;
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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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struct blk_queue_tag *queue_tags;
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struct list_head tag_busy_list;
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unsigned int nr_sorted;
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unsigned int in_flight[2];
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struct blk_rq_stat rq_stats[2];
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/*
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* Number of active block driver functions for which blk_drain_queue()
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* must wait. Must be incremented around functions that unlock the
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* queue_lock internally, e.g. scsi_request_fn().
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*/
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unsigned int request_fn_active;
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unsigned int rq_timeout;
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int poll_nsec;
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struct timer_list timeout;
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struct work_struct timeout_work;
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struct list_head timeout_list;
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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;
|
|
struct list_head blkg_list;
|
|
#endif
|
|
|
|
struct queue_limits limits;
|
|
|
|
/*
|
|
* sg stuff
|
|
*/
|
|
unsigned int sg_timeout;
|
|
unsigned int sg_reserved_size;
|
|
int node;
|
|
#ifdef CONFIG_BLK_DEV_IO_TRACE
|
|
struct blk_trace *blk_trace;
|
|
#endif
|
|
/*
|
|
* for flush operations
|
|
*/
|
|
struct blk_flush_queue *fq;
|
|
|
|
struct list_head requeue_list;
|
|
spinlock_t requeue_lock;
|
|
struct delayed_work requeue_work;
|
|
|
|
struct mutex sysfs_lock;
|
|
|
|
int bypass_depth;
|
|
atomic_t mq_freeze_depth;
|
|
|
|
#if defined(CONFIG_BLK_DEV_BSG)
|
|
bsg_job_fn *bsg_job_fn;
|
|
int bsg_job_size;
|
|
struct bsg_class_device bsg_dev;
|
|
#endif
|
|
|
|
#ifdef CONFIG_BLK_DEV_THROTTLING
|
|
/* Throttle data */
|
|
struct throtl_data *td;
|
|
#endif
|
|
struct rcu_head rcu_head;
|
|
wait_queue_head_t mq_freeze_wq;
|
|
struct percpu_ref q_usage_counter;
|
|
struct list_head all_q_node;
|
|
|
|
struct blk_mq_tag_set *tag_set;
|
|
struct list_head tag_set_list;
|
|
struct bio_set *bio_split;
|
|
|
|
bool mq_sysfs_init_done;
|
|
};
|
|
|
|
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
|
|
#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
|
|
#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
|
|
#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
|
|
#define QUEUE_FLAG_DYING 5 /* queue being torn down */
|
|
#define QUEUE_FLAG_BYPASS 6 /* act as dumb FIFO queue */
|
|
#define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */
|
|
#define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */
|
|
#define QUEUE_FLAG_SAME_COMP 9 /* complete on same CPU-group */
|
|
#define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
|
|
#define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
|
|
#define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
|
|
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
|
|
#define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
|
|
#define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
|
|
#define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
|
|
#define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
|
|
#define QUEUE_FLAG_SECERASE 17 /* supports secure erase */
|
|
#define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
|
|
#define QUEUE_FLAG_DEAD 19 /* queue tear-down finished */
|
|
#define QUEUE_FLAG_INIT_DONE 20 /* queue is initialized */
|
|
#define QUEUE_FLAG_NO_SG_MERGE 21 /* don't attempt to merge SG segments*/
|
|
#define QUEUE_FLAG_POLL 22 /* IO polling enabled if set */
|
|
#define QUEUE_FLAG_WC 23 /* Write back caching */
|
|
#define QUEUE_FLAG_FUA 24 /* device supports FUA writes */
|
|
#define QUEUE_FLAG_FLUSH_NQ 25 /* flush not queueuable */
|
|
#define QUEUE_FLAG_DAX 26 /* device supports DAX */
|
|
#define QUEUE_FLAG_STATS 27 /* track rq completion times */
|
|
|
|
#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
|
|
(1 << QUEUE_FLAG_STACKABLE) | \
|
|
(1 << QUEUE_FLAG_SAME_COMP) | \
|
|
(1 << QUEUE_FLAG_ADD_RANDOM))
|
|
|
|
#define QUEUE_FLAG_MQ_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
|
|
(1 << QUEUE_FLAG_STACKABLE) | \
|
|
(1 << QUEUE_FLAG_SAME_COMP) | \
|
|
(1 << QUEUE_FLAG_POLL))
|
|
|
|
static inline void queue_lockdep_assert_held(struct request_queue *q)
|
|
{
|
|
if (q->queue_lock)
|
|
lockdep_assert_held(q->queue_lock);
|
|
}
|
|
|
|
static inline void queue_flag_set_unlocked(unsigned int flag,
|
|
struct request_queue *q)
|
|
{
|
|
__set_bit(flag, &q->queue_flags);
|
|
}
|
|
|
|
static inline int queue_flag_test_and_clear(unsigned int flag,
|
|
struct request_queue *q)
|
|
{
|
|
queue_lockdep_assert_held(q);
|
|
|
|
if (test_bit(flag, &q->queue_flags)) {
|
|
__clear_bit(flag, &q->queue_flags);
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int queue_flag_test_and_set(unsigned int flag,
|
|
struct request_queue *q)
|
|
{
|
|
queue_lockdep_assert_held(q);
|
|
|
|
if (!test_bit(flag, &q->queue_flags)) {
|
|
__set_bit(flag, &q->queue_flags);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
|
|
{
|
|
queue_lockdep_assert_held(q);
|
|
__set_bit(flag, &q->queue_flags);
|
|
}
|
|
|
|
static inline void queue_flag_clear_unlocked(unsigned int flag,
|
|
struct request_queue *q)
|
|
{
|
|
__clear_bit(flag, &q->queue_flags);
|
|
}
|
|
|
|
static inline int queue_in_flight(struct request_queue *q)
|
|
{
|
|
return q->in_flight[0] + q->in_flight[1];
|
|
}
|
|
|
|
static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
|
|
{
|
|
queue_lockdep_assert_held(q);
|
|
__clear_bit(flag, &q->queue_flags);
|
|
}
|
|
|
|
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
|
|
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
|
|
#define blk_queue_dying(q) test_bit(QUEUE_FLAG_DYING, &(q)->queue_flags)
|
|
#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(q)->queue_flags)
|
|
#define blk_queue_bypass(q) test_bit(QUEUE_FLAG_BYPASS, &(q)->queue_flags)
|
|
#define blk_queue_init_done(q) test_bit(QUEUE_FLAG_INIT_DONE, &(q)->queue_flags)
|
|
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
|
|
#define blk_queue_noxmerges(q) \
|
|
test_bit(QUEUE_FLAG_NOXMERGES, &(q)->queue_flags)
|
|
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
|
|
#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
|
|
#define blk_queue_add_random(q) test_bit(QUEUE_FLAG_ADD_RANDOM, &(q)->queue_flags)
|
|
#define blk_queue_stackable(q) \
|
|
test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
|
|
#define blk_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(q)->queue_flags)
|
|
#define blk_queue_secure_erase(q) \
|
|
(test_bit(QUEUE_FLAG_SECERASE, &(q)->queue_flags))
|
|
#define blk_queue_dax(q) test_bit(QUEUE_FLAG_DAX, &(q)->queue_flags)
|
|
|
|
#define blk_noretry_request(rq) \
|
|
((rq)->cmd_flags & (REQ_FAILFAST_DEV|REQ_FAILFAST_TRANSPORT| \
|
|
REQ_FAILFAST_DRIVER))
|
|
|
|
#define blk_account_rq(rq) \
|
|
(((rq)->rq_flags & RQF_STARTED) && \
|
|
((rq)->cmd_type == REQ_TYPE_FS))
|
|
|
|
#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
|
|
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
|
|
/* rq->queuelist of dequeued request must be list_empty() */
|
|
#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
|
|
|
|
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
|
|
|
|
#define rq_data_dir(rq) (op_is_write(req_op(rq)) ? WRITE : READ)
|
|
|
|
/*
|
|
* Driver can handle struct request, if it either has an old style
|
|
* request_fn defined, or is blk-mq based.
|
|
*/
|
|
static inline bool queue_is_rq_based(struct request_queue *q)
|
|
{
|
|
return q->request_fn || q->mq_ops;
|
|
}
|
|
|
|
static inline unsigned int blk_queue_cluster(struct request_queue *q)
|
|
{
|
|
return q->limits.cluster;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
|
|
static inline unsigned int blk_queue_zone_size(struct request_queue *q)
|
|
{
|
|
return blk_queue_is_zoned(q) ? q->limits.chunk_sectors : 0;
|
|
}
|
|
|
|
static inline bool rq_is_sync(struct request *rq)
|
|
{
|
|
return op_is_sync(rq->cmd_flags);
|
|
}
|
|
|
|
static inline bool blk_rl_full(struct request_list *rl, bool sync)
|
|
{
|
|
unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
|
|
|
|
return rl->flags & flag;
|
|
}
|
|
|
|
static inline void blk_set_rl_full(struct request_list *rl, bool sync)
|
|
{
|
|
unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
|
|
|
|
rl->flags |= flag;
|
|
}
|
|
|
|
static inline void blk_clear_rl_full(struct request_list *rl, bool sync)
|
|
{
|
|
unsigned int flag = sync ? BLK_RL_SYNCFULL : BLK_RL_ASYNCFULL;
|
|
|
|
rl->flags &= ~flag;
|
|
}
|
|
|
|
static inline bool rq_mergeable(struct request *rq)
|
|
{
|
|
if (rq->cmd_type != REQ_TYPE_FS)
|
|
return false;
|
|
|
|
if (req_op(rq) == REQ_OP_FLUSH)
|
|
return false;
|
|
|
|
if (req_op(rq) == REQ_OP_WRITE_ZEROES)
|
|
return false;
|
|
|
|
if (rq->cmd_flags & REQ_NOMERGE_FLAGS)
|
|
return false;
|
|
if (rq->rq_flags & RQF_NOMERGE_FLAGS)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static inline bool blk_write_same_mergeable(struct bio *a, struct bio *b)
|
|
{
|
|
if (bio_data(a) == bio_data(b))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline unsigned int blk_queue_depth(struct request_queue *q)
|
|
{
|
|
if (q->queue_depth)
|
|
return q->queue_depth;
|
|
|
|
return q->nr_requests;
|
|
}
|
|
|
|
/*
|
|
* q->prep_rq_fn return values
|
|
*/
|
|
enum {
|
|
BLKPREP_OK, /* serve it */
|
|
BLKPREP_KILL, /* fatal error, kill, return -EIO */
|
|
BLKPREP_DEFER, /* leave on queue */
|
|
BLKPREP_INVALID, /* invalid command, kill, return -EREMOTEIO */
|
|
};
|
|
|
|
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
|
|
*/
|
|
|
|
#if BITS_PER_LONG == 32
|
|
#define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT)
|
|
#else
|
|
#define BLK_BOUNCE_HIGH -1ULL
|
|
#endif
|
|
#define BLK_BOUNCE_ANY (-1ULL)
|
|
#define BLK_BOUNCE_ISA (DMA_BIT_MASK(24))
|
|
|
|
/*
|
|
* default timeout for SG_IO if none specified
|
|
*/
|
|
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
|
|
#define BLK_MIN_SG_TIMEOUT (7 * HZ)
|
|
|
|
#ifdef CONFIG_BOUNCE
|
|
extern int init_emergency_isa_pool(void);
|
|
extern void blk_queue_bounce(struct request_queue *q, struct bio **bio);
|
|
#else
|
|
static inline int init_emergency_isa_pool(void)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
|
|
{
|
|
}
|
|
#endif /* CONFIG_MMU */
|
|
|
|
struct rq_map_data {
|
|
struct page **pages;
|
|
int page_order;
|
|
int nr_entries;
|
|
unsigned long offset;
|
|
int null_mapped;
|
|
int from_user;
|
|
};
|
|
|
|
struct req_iterator {
|
|
struct bvec_iter iter;
|
|
struct bio *bio;
|
|
};
|
|
|
|
/* This should not be used directly - use rq_for_each_segment */
|
|
#define for_each_bio(_bio) \
|
|
for (; _bio; _bio = _bio->bi_next)
|
|
#define __rq_for_each_bio(_bio, rq) \
|
|
if ((rq->bio)) \
|
|
for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
|
|
|
|
#define rq_for_each_segment(bvl, _rq, _iter) \
|
|
__rq_for_each_bio(_iter.bio, _rq) \
|
|
bio_for_each_segment(bvl, _iter.bio, _iter.iter)
|
|
|
|
#define rq_iter_last(bvec, _iter) \
|
|
(_iter.bio->bi_next == NULL && \
|
|
bio_iter_last(bvec, _iter.iter))
|
|
|
|
#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
|
|
|
|
#ifdef CONFIG_PRINTK
|
|
#define vfs_msg(sb, level, fmt, ...) \
|
|
__vfs_msg(sb, level, fmt, ##__VA_ARGS__)
|
|
#else
|
|
#define vfs_msg(sb, level, fmt, ...) \
|
|
do { \
|
|
no_printk(fmt, ##__VA_ARGS__); \
|
|
__vfs_msg(sb, "", " "); \
|
|
} while (0)
|
|
#endif
|
|
|
|
extern int blk_register_queue(struct gendisk *disk);
|
|
extern void blk_unregister_queue(struct gendisk *disk);
|
|
extern blk_qc_t generic_make_request(struct bio *bio);
|
|
extern void blk_rq_init(struct request_queue *q, struct request *rq);
|
|
extern void blk_put_request(struct request *);
|
|
extern void __blk_put_request(struct request_queue *, struct request *);
|
|
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
|
|
extern void blk_rq_set_block_pc(struct request *);
|
|
extern void blk_requeue_request(struct request_queue *, struct request *);
|
|
extern int blk_lld_busy(struct request_queue *q);
|
|
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);
|
|
extern int blk_insert_cloned_request(struct request_queue *q,
|
|
struct request *rq);
|
|
extern int blk_rq_append_bio(struct request *rq, struct bio *bio);
|
|
extern void blk_delay_queue(struct request_queue *, unsigned long);
|
|
extern void blk_queue_split(struct request_queue *, struct bio **,
|
|
struct bio_set *);
|
|
extern void blk_recount_segments(struct request_queue *, struct bio *);
|
|
extern int scsi_verify_blk_ioctl(struct block_device *, unsigned int);
|
|
extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
|
|
unsigned int, void __user *);
|
|
extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
unsigned int, void __user *);
|
|
extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
|
|
struct scsi_ioctl_command __user *);
|
|
|
|
extern int blk_queue_enter(struct request_queue *q, bool nowait);
|
|
extern void blk_queue_exit(struct request_queue *q);
|
|
extern void blk_start_queue(struct request_queue *q);
|
|
extern void blk_start_queue_async(struct request_queue *q);
|
|
extern void blk_stop_queue(struct request_queue *q);
|
|
extern void blk_sync_queue(struct request_queue *q);
|
|
extern void __blk_stop_queue(struct request_queue *q);
|
|
extern void __blk_run_queue(struct request_queue *q);
|
|
extern void __blk_run_queue_uncond(struct request_queue *q);
|
|
extern void blk_run_queue(struct request_queue *);
|
|
extern void blk_run_queue_async(struct request_queue *q);
|
|
extern void blk_mq_quiesce_queue(struct request_queue *q);
|
|
extern int blk_rq_map_user(struct request_queue *, struct request *,
|
|
struct rq_map_data *, void __user *, unsigned long,
|
|
gfp_t);
|
|
extern int blk_rq_unmap_user(struct bio *);
|
|
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 *,
|
|
struct rq_map_data *, const struct iov_iter *,
|
|
gfp_t);
|
|
extern int blk_execute_rq(struct request_queue *, struct gendisk *,
|
|
struct request *, int);
|
|
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
|
|
struct request *, int, rq_end_io_fn *);
|
|
|
|
bool blk_mq_poll(struct request_queue *q, blk_qc_t cookie);
|
|
|
|
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_disk->queue; /* this is never NULL */
|
|
}
|
|
|
|
/*
|
|
* 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
|
|
*/
|
|
static inline sector_t blk_rq_pos(const struct request *rq)
|
|
{
|
|
return rq->__sector;
|
|
}
|
|
|
|
static inline unsigned int blk_rq_bytes(const struct request *rq)
|
|
{
|
|
return rq->__data_len;
|
|
}
|
|
|
|
static inline int blk_rq_cur_bytes(const struct request *rq)
|
|
{
|
|
return rq->bio ? bio_cur_bytes(rq->bio) : 0;
|
|
}
|
|
|
|
extern unsigned int blk_rq_err_bytes(const struct request *rq);
|
|
|
|
static inline unsigned int blk_rq_sectors(const struct request *rq)
|
|
{
|
|
return blk_rq_bytes(rq) >> 9;
|
|
}
|
|
|
|
static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
|
|
{
|
|
return blk_rq_cur_bytes(rq) >> 9;
|
|
}
|
|
|
|
static inline unsigned int blk_queue_get_max_sectors(struct request_queue *q,
|
|
int op)
|
|
{
|
|
if (unlikely(op == REQ_OP_DISCARD || op == REQ_OP_SECURE_ERASE))
|
|
return min(q->limits.max_discard_sectors, UINT_MAX >> 9);
|
|
|
|
if (unlikely(op == REQ_OP_WRITE_SAME))
|
|
return q->limits.max_write_same_sectors;
|
|
|
|
if (unlikely(op == REQ_OP_WRITE_ZEROES))
|
|
return q->limits.max_write_zeroes_sectors;
|
|
|
|
return q->limits.max_sectors;
|
|
}
|
|
|
|
/*
|
|
* 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)
|
|
return q->limits.max_sectors;
|
|
|
|
return q->limits.chunk_sectors -
|
|
(offset & (q->limits.chunk_sectors - 1));
|
|
}
|
|
|
|
static inline unsigned int blk_rq_get_max_sectors(struct request *rq,
|
|
sector_t offset)
|
|
{
|
|
struct request_queue *q = rq->q;
|
|
|
|
if (unlikely(rq->cmd_type != REQ_TYPE_FS))
|
|
return q->limits.max_hw_sectors;
|
|
|
|
if (!q->limits.chunk_sectors ||
|
|
req_op(rq) == REQ_OP_DISCARD ||
|
|
req_op(rq) == REQ_OP_SECURE_ERASE)
|
|
return blk_queue_get_max_sectors(q, req_op(rq));
|
|
|
|
return min(blk_max_size_offset(q, offset),
|
|
blk_queue_get_max_sectors(q, req_op(rq)));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/*
|
|
* blk_rq_set_prio - associate a request with prio from ioc
|
|
* @rq: request of interest
|
|
* @ioc: target iocontext
|
|
*
|
|
* Assocate request prio with ioc prio so request based drivers
|
|
* can leverage priority information.
|
|
*/
|
|
static inline void blk_rq_set_prio(struct request *rq, struct io_context *ioc)
|
|
{
|
|
if (ioc)
|
|
rq->ioprio = ioc->ioprio;
|
|
}
|
|
|
|
/*
|
|
* Request issue related functions.
|
|
*/
|
|
extern struct request *blk_peek_request(struct request_queue *q);
|
|
extern void blk_start_request(struct request *rq);
|
|
extern struct request *blk_fetch_request(struct request_queue *q);
|
|
|
|
/*
|
|
* Request completion related functions.
|
|
*
|
|
* blk_update_request() completes given number of bytes and updates
|
|
* the request without completing it.
|
|
*
|
|
* blk_end_request() and friends. __blk_end_request() must be called
|
|
* with the request queue spinlock acquired.
|
|
*
|
|
* Several drivers define their own end_request and call
|
|
* blk_end_request() for parts of the original function.
|
|
* This prevents code duplication in drivers.
|
|
*/
|
|
extern bool blk_update_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
extern void blk_finish_request(struct request *rq, int error);
|
|
extern bool blk_end_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
extern void blk_end_request_all(struct request *rq, int error);
|
|
extern bool blk_end_request_cur(struct request *rq, int error);
|
|
extern bool blk_end_request_err(struct request *rq, int error);
|
|
extern bool __blk_end_request(struct request *rq, int error,
|
|
unsigned int nr_bytes);
|
|
extern void __blk_end_request_all(struct request *rq, int error);
|
|
extern bool __blk_end_request_cur(struct request *rq, int error);
|
|
extern bool __blk_end_request_err(struct request *rq, int error);
|
|
|
|
extern void blk_complete_request(struct request *);
|
|
extern void __blk_complete_request(struct request *);
|
|
extern void blk_abort_request(struct request *);
|
|
extern void blk_unprep_request(struct request *);
|
|
|
|
/*
|
|
* Access functions for manipulating queue properties
|
|
*/
|
|
extern struct request_queue *blk_init_queue_node(request_fn_proc *rfn,
|
|
spinlock_t *lock, int node_id);
|
|
extern struct request_queue *blk_init_queue(request_fn_proc *, spinlock_t *);
|
|
extern struct request_queue *blk_init_allocated_queue(struct request_queue *,
|
|
request_fn_proc *, spinlock_t *);
|
|
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);
|
|
extern void blk_queue_max_hw_sectors(struct request_queue *, unsigned int);
|
|
extern void blk_queue_chunk_sectors(struct request_queue *, unsigned int);
|
|
extern void blk_queue_max_segments(struct request_queue *, unsigned short);
|
|
extern void blk_queue_max_segment_size(struct request_queue *, unsigned int);
|
|
extern void blk_queue_max_discard_sectors(struct request_queue *q,
|
|
unsigned int max_discard_sectors);
|
|
extern void blk_queue_max_write_same_sectors(struct request_queue *q,
|
|
unsigned int max_write_same_sectors);
|
|
extern void blk_queue_max_write_zeroes_sectors(struct request_queue *q,
|
|
unsigned int max_write_same_sectors);
|
|
extern void blk_queue_logical_block_size(struct request_queue *, unsigned short);
|
|
extern void blk_queue_physical_block_size(struct request_queue *, unsigned int);
|
|
extern void blk_queue_alignment_offset(struct request_queue *q,
|
|
unsigned int alignment);
|
|
extern void blk_limits_io_min(struct queue_limits *limits, unsigned int min);
|
|
extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
|
|
extern void blk_limits_io_opt(struct queue_limits *limits, unsigned int opt);
|
|
extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
|
|
extern void blk_set_queue_depth(struct request_queue *q, unsigned int depth);
|
|
extern void blk_set_default_limits(struct queue_limits *lim);
|
|
extern void blk_set_stacking_limits(struct queue_limits *lim);
|
|
extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
|
|
sector_t offset);
|
|
extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
|
|
sector_t offset);
|
|
extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
|
|
sector_t offset);
|
|
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
|
|
extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
|
|
extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
|
|
extern int blk_queue_dma_drain(struct request_queue *q,
|
|
dma_drain_needed_fn *dma_drain_needed,
|
|
void *buf, unsigned int size);
|
|
extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
|
|
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
|
|
extern void blk_queue_virt_boundary(struct request_queue *, unsigned long);
|
|
extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
|
|
extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
|
|
extern void blk_queue_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
|
|
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
|
|
extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
|
|
extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
|
|
extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable);
|
|
extern void blk_queue_write_cache(struct request_queue *q, bool enabled, bool fua);
|
|
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
|
|
|
|
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;
|
|
}
|
|
|
|
extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
|
|
extern void blk_dump_rq_flags(struct request *, char *);
|
|
extern long nr_blockdev_pages(void);
|
|
|
|
bool __must_check blk_get_queue(struct request_queue *);
|
|
struct request_queue *blk_alloc_queue(gfp_t);
|
|
struct request_queue *blk_alloc_queue_node(gfp_t, int);
|
|
extern void blk_put_queue(struct request_queue *);
|
|
extern void blk_set_queue_dying(struct request_queue *);
|
|
|
|
/*
|
|
* block layer runtime pm functions
|
|
*/
|
|
#ifdef CONFIG_PM
|
|
extern void blk_pm_runtime_init(struct request_queue *q, struct device *dev);
|
|
extern int blk_pre_runtime_suspend(struct request_queue *q);
|
|
extern void blk_post_runtime_suspend(struct request_queue *q, int err);
|
|
extern void blk_pre_runtime_resume(struct request_queue *q);
|
|
extern void blk_post_runtime_resume(struct request_queue *q, int err);
|
|
extern void blk_set_runtime_active(struct request_queue *q);
|
|
#else
|
|
static inline void blk_pm_runtime_init(struct request_queue *q,
|
|
struct device *dev) {}
|
|
static inline int blk_pre_runtime_suspend(struct request_queue *q)
|
|
{
|
|
return -ENOSYS;
|
|
}
|
|
static inline void blk_post_runtime_suspend(struct request_queue *q, int err) {}
|
|
static inline void blk_pre_runtime_resume(struct request_queue *q) {}
|
|
static inline void blk_post_runtime_resume(struct request_queue *q, int err) {}
|
|
static inline void blk_set_runtime_active(struct request_queue *q) {}
|
|
#endif
|
|
|
|
/*
|
|
* 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.
|
|
*/
|
|
struct blk_plug {
|
|
struct list_head list; /* requests */
|
|
struct list_head mq_list; /* blk-mq requests */
|
|
struct list_head cb_list; /* md requires an unplug callback */
|
|
};
|
|
#define BLK_MAX_REQUEST_COUNT 16
|
|
#define BLK_PLUG_FLUSH_SIZE (128 * 1024)
|
|
|
|
struct blk_plug_cb;
|
|
typedef void (*blk_plug_cb_fn)(struct blk_plug_cb *, bool);
|
|
struct blk_plug_cb {
|
|
struct list_head list;
|
|
blk_plug_cb_fn callback;
|
|
void *data;
|
|
};
|
|
extern struct blk_plug_cb *blk_check_plugged(blk_plug_cb_fn unplug,
|
|
void *data, int size);
|
|
extern void blk_start_plug(struct blk_plug *);
|
|
extern void blk_finish_plug(struct blk_plug *);
|
|
extern void blk_flush_plug_list(struct blk_plug *, bool);
|
|
|
|
static inline void blk_flush_plug(struct task_struct *tsk)
|
|
{
|
|
struct blk_plug *plug = tsk->plug;
|
|
|
|
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;
|
|
|
|
if (plug)
|
|
blk_flush_plug_list(plug, true);
|
|
}
|
|
|
|
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
|
|
{
|
|
struct blk_plug *plug = tsk->plug;
|
|
|
|
return plug &&
|
|
(!list_empty(&plug->list) ||
|
|
!list_empty(&plug->mq_list) ||
|
|
!list_empty(&plug->cb_list));
|
|
}
|
|
|
|
/*
|
|
* tag stuff
|
|
*/
|
|
extern int blk_queue_start_tag(struct request_queue *, struct request *);
|
|
extern struct request *blk_queue_find_tag(struct request_queue *, int);
|
|
extern void blk_queue_end_tag(struct request_queue *, struct request *);
|
|
extern int blk_queue_init_tags(struct request_queue *, int, struct blk_queue_tag *, int);
|
|
extern void blk_queue_free_tags(struct request_queue *);
|
|
extern int blk_queue_resize_tags(struct request_queue *, int);
|
|
extern void blk_queue_invalidate_tags(struct request_queue *);
|
|
extern struct blk_queue_tag *blk_init_tags(int, int);
|
|
extern void blk_free_tags(struct blk_queue_tag *);
|
|
|
|
static inline struct request *blk_map_queue_find_tag(struct blk_queue_tag *bqt,
|
|
int tag)
|
|
{
|
|
if (unlikely(bqt == NULL || tag >= bqt->real_max_depth))
|
|
return NULL;
|
|
return bqt->tag_index[tag];
|
|
}
|
|
|
|
|
|
#define BLKDEV_DISCARD_SECURE (1 << 0) /* issue a secure erase */
|
|
#define BLKDEV_DISCARD_ZERO (1 << 1) /* must reliably zero data */
|
|
|
|
extern int blkdev_issue_flush(struct block_device *, gfp_t, sector_t *);
|
|
extern int blkdev_issue_discard(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, unsigned long flags);
|
|
extern int __blkdev_issue_discard(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, int flags,
|
|
struct bio **biop);
|
|
extern int blkdev_issue_write_same(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, struct page *page);
|
|
extern int __blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, struct bio **biop,
|
|
bool discard);
|
|
extern int blkdev_issue_zeroout(struct block_device *bdev, sector_t sector,
|
|
sector_t nr_sects, gfp_t gfp_mask, bool discard);
|
|
static inline int sb_issue_discard(struct super_block *sb, sector_t block,
|
|
sector_t nr_blocks, gfp_t gfp_mask, unsigned long flags)
|
|
{
|
|
return blkdev_issue_discard(sb->s_bdev, block << (sb->s_blocksize_bits - 9),
|
|
nr_blocks << (sb->s_blocksize_bits - 9),
|
|
gfp_mask, flags);
|
|
}
|
|
static inline int sb_issue_zeroout(struct super_block *sb, sector_t block,
|
|
sector_t nr_blocks, gfp_t gfp_mask)
|
|
{
|
|
return blkdev_issue_zeroout(sb->s_bdev,
|
|
block << (sb->s_blocksize_bits - 9),
|
|
nr_blocks << (sb->s_blocksize_bits - 9),
|
|
gfp_mask, true);
|
|
}
|
|
|
|
extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
|
|
|
|
enum blk_default_limits {
|
|
BLK_MAX_SEGMENTS = 128,
|
|
BLK_SAFE_MAX_SECTORS = 255,
|
|
BLK_DEF_MAX_SECTORS = 2560,
|
|
BLK_MAX_SEGMENT_SIZE = 65536,
|
|
BLK_SEG_BOUNDARY_MASK = 0xFFFFFFFFUL,
|
|
};
|
|
|
|
#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
|
|
|
|
static inline unsigned long queue_bounce_pfn(struct request_queue *q)
|
|
{
|
|
return q->limits.bounce_pfn;
|
|
}
|
|
|
|
static inline unsigned long queue_segment_boundary(struct request_queue *q)
|
|
{
|
|
return q->limits.seg_boundary_mask;
|
|
}
|
|
|
|
static inline unsigned long queue_virt_boundary(struct request_queue *q)
|
|
{
|
|
return q->limits.virt_boundary_mask;
|
|
}
|
|
|
|
static inline unsigned int queue_max_sectors(struct request_queue *q)
|
|
{
|
|
return q->limits.max_sectors;
|
|
}
|
|
|
|
static inline unsigned int queue_max_hw_sectors(struct request_queue *q)
|
|
{
|
|
return q->limits.max_hw_sectors;
|
|
}
|
|
|
|
static inline unsigned short queue_max_segments(struct request_queue *q)
|
|
{
|
|
return q->limits.max_segments;
|
|
}
|
|
|
|
static inline unsigned int queue_max_segment_size(struct request_queue *q)
|
|
{
|
|
return q->limits.max_segment_size;
|
|
}
|
|
|
|
static inline unsigned short queue_logical_block_size(struct request_queue *q)
|
|
{
|
|
int retval = 512;
|
|
|
|
if (q && q->limits.logical_block_size)
|
|
retval = q->limits.logical_block_size;
|
|
|
|
return retval;
|
|
}
|
|
|
|
static inline unsigned short bdev_logical_block_size(struct block_device *bdev)
|
|
{
|
|
return queue_logical_block_size(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_physical_block_size(struct request_queue *q)
|
|
{
|
|
return q->limits.physical_block_size;
|
|
}
|
|
|
|
static inline unsigned int bdev_physical_block_size(struct block_device *bdev)
|
|
{
|
|
return queue_physical_block_size(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_io_min(struct request_queue *q)
|
|
{
|
|
return q->limits.io_min;
|
|
}
|
|
|
|
static inline int bdev_io_min(struct block_device *bdev)
|
|
{
|
|
return queue_io_min(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline unsigned int queue_io_opt(struct request_queue *q)
|
|
{
|
|
return q->limits.io_opt;
|
|
}
|
|
|
|
static inline int bdev_io_opt(struct block_device *bdev)
|
|
{
|
|
return queue_io_opt(bdev_get_queue(bdev));
|
|
}
|
|
|
|
static inline int queue_alignment_offset(struct request_queue *q)
|
|
{
|
|
if (q->limits.misaligned)
|
|
return -1;
|
|
|
|
return q->limits.alignment_offset;
|
|
}
|
|
|
|
static inline int queue_limit_alignment_offset(struct queue_limits *lim, sector_t sector)
|
|
{
|
|
unsigned int granularity = max(lim->physical_block_size, lim->io_min);
|
|
unsigned int alignment = sector_div(sector, granularity >> 9) << 9;
|
|
|
|
return (granularity + lim->alignment_offset - alignment) % granularity;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline int queue_discard_alignment(struct request_queue *q)
|
|
{
|
|
if (q->limits.discard_misaligned)
|
|
return -1;
|
|
|
|
return q->limits.discard_alignment;
|
|
}
|
|
|
|
static inline int queue_limit_discard_alignment(struct queue_limits *lim, sector_t sector)
|
|
{
|
|
unsigned int alignment, granularity, offset;
|
|
|
|
if (!lim->max_discard_sectors)
|
|
return 0;
|
|
|
|
/* Why are these in bytes, not sectors? */
|
|
alignment = lim->discard_alignment >> 9;
|
|
granularity = lim->discard_granularity >> 9;
|
|
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 */
|
|
return offset << 9;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
|
|
{
|
|
if (q->limits.max_discard_sectors && q->limits.discard_zeroes_data == 1)
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline unsigned int bdev_discard_zeroes_data(struct block_device *bdev)
|
|
{
|
|
return queue_discard_zeroes_data(bdev_get_queue(bdev));
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
static inline unsigned int bdev_zone_size(struct block_device *bdev)
|
|
{
|
|
struct request_queue *q = bdev_get_queue(bdev);
|
|
|
|
if (q)
|
|
return blk_queue_zone_size(q);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static inline int queue_dma_alignment(struct request_queue *q)
|
|
{
|
|
return q ? q->dma_alignment : 511;
|
|
}
|
|
|
|
static inline int blk_rq_aligned(struct request_queue *q, unsigned long addr,
|
|
unsigned int len)
|
|
{
|
|
unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
|
|
return !(addr & alignment) && !(len & alignment);
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static inline unsigned int block_size(struct block_device *bdev)
|
|
{
|
|
return bdev->bd_block_size;
|
|
}
|
|
|
|
static inline bool queue_flush_queueable(struct request_queue *q)
|
|
{
|
|
return !test_bit(QUEUE_FLAG_FLUSH_NQ, &q->queue_flags);
|
|
}
|
|
|
|
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)
|
|
{
|
|
put_page(p.v);
|
|
}
|
|
|
|
static inline bool __bvec_gap_to_prev(struct request_queue *q,
|
|
struct bio_vec *bprv, unsigned int offset)
|
|
{
|
|
return offset ||
|
|
((bprv->bv_offset + bprv->bv_len) & queue_virt_boundary(q));
|
|
}
|
|
|
|
/*
|
|
* Check if adding a bio_vec after bprv with offset would create a gap in
|
|
* the SG list. Most drivers don't care about this, but some do.
|
|
*/
|
|
static inline bool bvec_gap_to_prev(struct request_queue *q,
|
|
struct bio_vec *bprv, unsigned int offset)
|
|
{
|
|
if (!queue_virt_boundary(q))
|
|
return false;
|
|
return __bvec_gap_to_prev(q, bprv, offset);
|
|
}
|
|
|
|
/*
|
|
* Check if the two bvecs from two bios can be merged to one segment.
|
|
* If yes, no need to check gap between the two bios since the 1st bio
|
|
* and the 1st bvec in the 2nd bio can be handled in one segment.
|
|
*/
|
|
static inline bool bios_segs_mergeable(struct request_queue *q,
|
|
struct bio *prev, struct bio_vec *prev_last_bv,
|
|
struct bio_vec *next_first_bv)
|
|
{
|
|
if (!BIOVEC_PHYS_MERGEABLE(prev_last_bv, next_first_bv))
|
|
return false;
|
|
if (!BIOVEC_SEG_BOUNDARY(q, prev_last_bv, next_first_bv))
|
|
return false;
|
|
if (prev->bi_seg_back_size + next_first_bv->bv_len >
|
|
queue_max_segment_size(q))
|
|
return false;
|
|
return true;
|
|
}
|
|
|
|
static inline bool bio_will_gap(struct request_queue *q, struct bio *prev,
|
|
struct bio *next)
|
|
{
|
|
if (bio_has_data(prev) && queue_virt_boundary(q)) {
|
|
struct bio_vec pb, nb;
|
|
|
|
bio_get_last_bvec(prev, &pb);
|
|
bio_get_first_bvec(next, &nb);
|
|
|
|
if (!bios_segs_mergeable(q, prev, &pb, &nb))
|
|
return __bvec_gap_to_prev(q, &pb, nb.bv_offset);
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static inline bool req_gap_back_merge(struct request *req, struct bio *bio)
|
|
{
|
|
return bio_will_gap(req->q, req->biotail, bio);
|
|
}
|
|
|
|
static inline bool req_gap_front_merge(struct request *req, struct bio *bio)
|
|
{
|
|
return bio_will_gap(req->q, bio, req->bio);
|
|
}
|
|
|
|
int kblockd_schedule_work(struct work_struct *work);
|
|
int kblockd_schedule_work_on(int cpu, struct work_struct *work);
|
|
int kblockd_schedule_delayed_work(struct delayed_work *dwork, unsigned long delay);
|
|
int kblockd_schedule_delayed_work_on(int cpu, struct delayed_work *dwork, unsigned long delay);
|
|
|
|
#ifdef CONFIG_BLK_CGROUP
|
|
/*
|
|
* This should not be using sched_clock(). A real patch is in progress
|
|
* to fix this up, until that is in place we need to disable preemption
|
|
* around sched_clock() in this function and set_io_start_time_ns().
|
|
*/
|
|
static inline void set_start_time_ns(struct request *req)
|
|
{
|
|
preempt_disable();
|
|
req->start_time_ns = sched_clock();
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline void set_io_start_time_ns(struct request *req)
|
|
{
|
|
preempt_disable();
|
|
req->io_start_time_ns = sched_clock();
|
|
preempt_enable();
|
|
}
|
|
|
|
static inline uint64_t rq_start_time_ns(struct request *req)
|
|
{
|
|
return req->start_time_ns;
|
|
}
|
|
|
|
static inline uint64_t rq_io_start_time_ns(struct request *req)
|
|
{
|
|
return req->io_start_time_ns;
|
|
}
|
|
#else
|
|
static inline void set_start_time_ns(struct request *req) {}
|
|
static inline void set_io_start_time_ns(struct request *req) {}
|
|
static inline uint64_t rq_start_time_ns(struct request *req)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline uint64_t rq_io_start_time_ns(struct request *req)
|
|
{
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
#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) "-*")
|
|
|
|
#if defined(CONFIG_BLK_DEV_INTEGRITY)
|
|
|
|
enum blk_integrity_flags {
|
|
BLK_INTEGRITY_VERIFY = 1 << 0,
|
|
BLK_INTEGRITY_GENERATE = 1 << 1,
|
|
BLK_INTEGRITY_DEVICE_CAPABLE = 1 << 2,
|
|
BLK_INTEGRITY_IP_CHECKSUM = 1 << 3,
|
|
};
|
|
|
|
struct blk_integrity_iter {
|
|
void *prot_buf;
|
|
void *data_buf;
|
|
sector_t seed;
|
|
unsigned int data_size;
|
|
unsigned short interval;
|
|
const char *disk_name;
|
|
};
|
|
|
|
typedef int (integrity_processing_fn) (struct blk_integrity_iter *);
|
|
|
|
struct blk_integrity_profile {
|
|
integrity_processing_fn *generate_fn;
|
|
integrity_processing_fn *verify_fn;
|
|
const char *name;
|
|
};
|
|
|
|
extern void blk_integrity_register(struct gendisk *, struct blk_integrity *);
|
|
extern void blk_integrity_unregister(struct gendisk *);
|
|
extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
|
|
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 *);
|
|
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 *);
|
|
|
|
static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
|
|
{
|
|
struct blk_integrity *bi = &disk->queue->integrity;
|
|
|
|
if (!bi->profile)
|
|
return NULL;
|
|
|
|
return bi;
|
|
}
|
|
|
|
static inline
|
|
struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
|
|
{
|
|
return blk_get_integrity(bdev->bd_disk);
|
|
}
|
|
|
|
static inline bool blk_integrity_rq(struct request *rq)
|
|
{
|
|
return rq->cmd_flags & REQ_INTEGRITY;
|
|
}
|
|
|
|
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
|
|
queue_max_integrity_segments(struct request_queue *q)
|
|
{
|
|
return q->limits.max_integrity_segments;
|
|
}
|
|
|
|
static inline bool integrity_req_gap_back_merge(struct request *req,
|
|
struct bio *next)
|
|
{
|
|
struct bio_integrity_payload *bip = bio_integrity(req->bio);
|
|
struct bio_integrity_payload *bip_next = bio_integrity(next);
|
|
|
|
return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
|
|
bip_next->bip_vec[0].bv_offset);
|
|
}
|
|
|
|
static inline bool integrity_req_gap_front_merge(struct request *req,
|
|
struct bio *bio)
|
|
{
|
|
struct bio_integrity_payload *bip = bio_integrity(bio);
|
|
struct bio_integrity_payload *bip_next = bio_integrity(req->bio);
|
|
|
|
return bvec_gap_to_prev(req->q, &bip->bip_vec[bip->bip_vcnt - 1],
|
|
bip_next->bip_vec[0].bv_offset);
|
|
}
|
|
|
|
#else /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
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)
|
|
{
|
|
return NULL;
|
|
}
|
|
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;
|
|
}
|
|
static inline void blk_integrity_register(struct gendisk *d,
|
|
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)
|
|
{
|
|
}
|
|
static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
|
|
{
|
|
return 0;
|
|
}
|
|
static inline bool blk_integrity_merge_rq(struct request_queue *rq,
|
|
struct request *r1,
|
|
struct request *r2)
|
|
{
|
|
return true;
|
|
}
|
|
static inline bool blk_integrity_merge_bio(struct request_queue *rq,
|
|
struct request *r,
|
|
struct bio *b)
|
|
{
|
|
return true;
|
|
}
|
|
|
|
static inline bool integrity_req_gap_back_merge(struct request *req,
|
|
struct bio *next)
|
|
{
|
|
return false;
|
|
}
|
|
static inline bool integrity_req_gap_front_merge(struct request *req,
|
|
struct bio *bio)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
#endif /* CONFIG_BLK_DEV_INTEGRITY */
|
|
|
|
/**
|
|
* struct blk_dax_ctl - control and output parameters for ->direct_access
|
|
* @sector: (input) offset relative to a block_device
|
|
* @addr: (output) kernel virtual address for @sector populated by driver
|
|
* @pfn: (output) page frame number for @addr populated by driver
|
|
* @size: (input) number of bytes requested
|
|
*/
|
|
struct blk_dax_ctl {
|
|
sector_t sector;
|
|
void *addr;
|
|
long size;
|
|
pfn_t pfn;
|
|
};
|
|
|
|
struct block_device_operations {
|
|
int (*open) (struct block_device *, fmode_t);
|
|
void (*release) (struct gendisk *, fmode_t);
|
|
int (*rw_page)(struct block_device *, sector_t, struct page *, bool);
|
|
int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
|
|
long (*direct_access)(struct block_device *, sector_t, void **, pfn_t *,
|
|
long);
|
|
unsigned int (*check_events) (struct gendisk *disk,
|
|
unsigned int clearing);
|
|
/* ->media_changed() is DEPRECATED, use ->check_events() instead */
|
|
int (*media_changed) (struct gendisk *);
|
|
void (*unlock_native_capacity) (struct gendisk *);
|
|
int (*revalidate_disk) (struct gendisk *);
|
|
int (*getgeo)(struct block_device *, struct hd_geometry *);
|
|
/* this callback is with swap_lock and sometimes page table lock held */
|
|
void (*swap_slot_free_notify) (struct block_device *, unsigned long);
|
|
struct module *owner;
|
|
const struct pr_ops *pr_ops;
|
|
};
|
|
|
|
extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
|
|
unsigned long);
|
|
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 *);
|
|
extern long bdev_direct_access(struct block_device *, struct blk_dax_ctl *);
|
|
extern int bdev_dax_supported(struct super_block *, int);
|
|
extern bool bdev_dax_capable(struct block_device *);
|
|
#else /* CONFIG_BLOCK */
|
|
|
|
struct block_device;
|
|
|
|
/*
|
|
* stubs for when the block layer is configured out
|
|
*/
|
|
#define buffer_heads_over_limit 0
|
|
|
|
static inline long nr_blockdev_pages(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
struct blk_plug {
|
|
};
|
|
|
|
static inline void blk_start_plug(struct blk_plug *plug)
|
|
{
|
|
}
|
|
|
|
static inline void blk_finish_plug(struct blk_plug *plug)
|
|
{
|
|
}
|
|
|
|
static inline void blk_flush_plug(struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
static inline void blk_schedule_flush_plug(struct task_struct *task)
|
|
{
|
|
}
|
|
|
|
|
|
static inline bool blk_needs_flush_plug(struct task_struct *tsk)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline int blkdev_issue_flush(struct block_device *bdev, gfp_t gfp_mask,
|
|
sector_t *error_sector)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
#endif /* CONFIG_BLOCK */
|
|
|
|
#endif
|