| #ifndef _LINUX_BLKDEV_H |
| #define _LINUX_BLKDEV_H |
| |
| #include <linux/sched.h> |
| |
| #ifdef CONFIG_BLOCK |
| |
| #include <linux/major.h> |
| #include <linux/genhd.h> |
| #include <linux/list.h> |
| #include <linux/llist.h> |
| #include <linux/timer.h> |
| #include <linux/workqueue.h> |
| #include <linux/pagemap.h> |
| #include <linux/backing-dev-defs.h> |
| #include <linux/wait.h> |
| #include <linux/mempool.h> |
| #include <linux/pfn.h> |
| #include <linux/bio.h> |
| #include <linux/stringify.h> |
| #include <linux/gfp.h> |
| #include <linux/bsg.h> |
| #include <linux/smp.h> |
| #include <linux/rcupdate.h> |
| #include <linux/percpu-refcount.h> |
| #include <linux/scatterlist.h> |
| |
| struct module; |
| struct scsi_ioctl_command; |
| |
| struct request_queue; |
| struct elevator_queue; |
| struct blk_trace; |
| struct request; |
| struct sg_io_hdr; |
| struct bsg_job; |
| struct blkcg_gq; |
| struct blk_flush_queue; |
| struct pr_ops; |
| |
| #define BLKDEV_MIN_RQ 4 |
| #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| |
| /* |
| * Maximum number of blkcg policies allowed to be registered concurrently. |
| * Defined here to simplify include dependency. |
| */ |
| #define BLKCG_MAX_POLS 2 |
| |
| struct request; |
| typedef void (rq_end_io_fn)(struct request *, int); |
| |
| #define BLK_RL_SYNCFULL (1U << 0) |
| #define BLK_RL_ASYNCFULL (1U << 1) |
| |
| struct request_list { |
| struct request_queue *q; /* the queue this rl belongs to */ |
| #ifdef CONFIG_BLK_CGROUP |
| struct blkcg_gq *blkg; /* blkg this request pool belongs to */ |
| #endif |
| /* |
| * count[], starved[], and wait[] are indexed by |
| * BLK_RW_SYNC/BLK_RW_ASYNC |
| */ |
| int count[2]; |
| int starved[2]; |
| mempool_t *rq_pool; |
| wait_queue_head_t wait[2]; |
| unsigned int flags; |
| }; |
| |
| /* |
| * request command types |
| */ |
| enum rq_cmd_type_bits { |
| REQ_TYPE_FS = 1, /* fs request */ |
| REQ_TYPE_BLOCK_PC, /* scsi command */ |
| REQ_TYPE_DRV_PRIV, /* driver defined types from here */ |
| }; |
| |
| #define BLK_MAX_CDB 16 |
| |
| /* |
| * 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. |
| */ |
| struct request { |
| struct list_head queuelist; |
| union { |
| struct call_single_data csd; |
| unsigned long fifo_time; |
| }; |
| |
| struct request_queue *q; |
| struct blk_mq_ctx *mq_ctx; |
| |
| u64 cmd_flags; |
| unsigned cmd_type; |
| unsigned long atomic_flags; |
| |
| int cpu; |
| |
| /* the following two fields are internal, NEVER access directly */ |
| unsigned int __data_len; /* total data len */ |
| sector_t __sector; /* sector cursor */ |
| |
| struct bio *bio; |
| struct bio *biotail; |
| |
| /* |
| * 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; |
| }; |
| |
| /* |
| * The rb_node is only used inside the io scheduler, requests |
| * are pruned when moved to the dispatch queue. So let the |
| * completion_data share space with the rb_node. |
| */ |
| union { |
| struct rb_node rb_node; /* sort/lookup */ |
| void *completion_data; |
| }; |
| |
| /* |
| * Three pointers are available for the IO schedulers, if they need |
| * more they have to dynamically allocate it. Flush requests are |
| * never put on the IO scheduler. So let the flush fields share |
| * space with the elevator data. |
| */ |
| union { |
| struct { |
| struct io_cq *icq; |
| void *priv[2]; |
| } elv; |
| |
| struct { |
| unsigned int seq; |
| struct list_head list; |
| rq_end_io_fn *saved_end_io; |
| } flush; |
| }; |
| |
| struct gendisk *rq_disk; |
| struct hd_struct *part; |
| unsigned long start_time; |
| #ifdef CONFIG_BLK_CGROUP |
| struct request_list *rl; /* rl this rq is alloced from */ |
| unsigned long long start_time_ns; |
| unsigned long long io_start_time_ns; /* when passed to hardware */ |
| #endif |
| /* Number of scatter-gather DMA addr+len pairs after |
| * physical address coalescing is performed. |
| */ |
| unsigned short nr_phys_segments; |
| #if defined(CONFIG_BLK_DEV_INTEGRITY) |
| unsigned short nr_integrity_segments; |
| #endif |
| |
| unsigned short ioprio; |
| |
| void *special; /* opaque pointer available for LLD use */ |
| |
| int tag; |
| int errors; |
| |
| /* |
| * when request is used as a packet command carrier |
| */ |
| unsigned char __cmd[BLK_MAX_CDB]; |
| unsigned char *cmd; |
| unsigned short cmd_len; |
| |
| unsigned int extra_len; /* length of alignment and padding */ |
| unsigned int sense_len; |
| unsigned int resid_len; /* residual count */ |
| void *sense; |
| |
| unsigned long deadline; |
| struct list_head timeout_list; |
| unsigned int timeout; |
| int retries; |
| |
| /* |
| * completion callback. |
| */ |
| rq_end_io_fn *end_io; |
| void *end_io_data; |
| |
| /* for bidi */ |
| struct request *next_rq; |
| }; |
| |
| static inline unsigned short req_get_ioprio(struct request *req) |
| { |
| return req->ioprio; |
| } |
| |
| #include <linux/elevator.h> |
| |
| struct blk_queue_ctx; |
| |
| typedef void (request_fn_proc) (struct request_queue *q); |
| typedef blk_qc_t (make_request_fn) (struct request_queue *q, struct bio *bio); |
| typedef int (prep_rq_fn) (struct request_queue *, struct request *); |
| typedef void (unprep_rq_fn) (struct request_queue *, struct request *); |
| |
| struct bio_vec; |
| typedef void (softirq_done_fn)(struct request *); |
| typedef int (dma_drain_needed_fn)(struct request *); |
| typedef int (lld_busy_fn) (struct request_queue *q); |
| typedef int (bsg_job_fn) (struct bsg_job *); |
| |
| enum blk_eh_timer_return { |
| BLK_EH_NOT_HANDLED, |
| BLK_EH_HANDLED, |
| BLK_EH_RESET_TIMER, |
| }; |
| |
| typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *); |
| |
| enum blk_queue_state { |
| Queue_down, |
| Queue_up, |
| }; |
| |
| struct blk_queue_tag { |
| struct request **tag_index; /* map of busy tags */ |
| unsigned long *tag_map; /* bit map of free/busy tags */ |
| int busy; /* current depth */ |
| int max_depth; /* what we will send to device */ |
| int real_max_depth; /* what the array can hold */ |
| atomic_t refcnt; /* map can be shared */ |
| int alloc_policy; /* tag allocation policy */ |
| int next_tag; /* next tag */ |
| }; |
| #define BLK_TAG_ALLOC_FIFO 0 /* allocate starting from 0 */ |
| #define BLK_TAG_ALLOC_RR 1 /* allocate starting from last allocated tag */ |
| |
| #define BLK_SCSI_MAX_CMDS (256) |
| #define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8)) |
| |
| struct queue_limits { |
| unsigned long bounce_pfn; |
| unsigned long seg_boundary_mask; |
| unsigned long virt_boundary_mask; |
| |
| unsigned int max_hw_sectors; |
| unsigned int max_dev_sectors; |
| unsigned int chunk_sectors; |
| unsigned int max_sectors; |
| unsigned int max_segment_size; |
| unsigned int physical_block_size; |
| unsigned int alignment_offset; |
| unsigned int io_min; |
| unsigned int io_opt; |
| unsigned int max_discard_sectors; |
| unsigned int max_hw_discard_sectors; |
| unsigned int max_write_same_sectors; |
| unsigned int discard_granularity; |
| unsigned int discard_alignment; |
| |
| unsigned short logical_block_size; |
| unsigned short max_segments; |
| unsigned short max_integrity_segments; |
| |
| unsigned char misaligned; |
| unsigned char discard_misaligned; |
| unsigned char cluster; |
| unsigned char discard_zeroes_data; |
| unsigned char raid_partial_stripes_expensive; |
| }; |
| |
| struct request_queue { |
| /* |
| * Together with queue_head for cacheline sharing |
| */ |
| struct list_head queue_head; |
| struct request *last_merge; |
| struct elevator_queue *elevator; |
| int nr_rqs[2]; /* # allocated [a]sync rqs */ |
| int nr_rqs_elvpriv; /* # allocated rqs w/ elvpriv */ |
| |
| /* |
| * If blkcg is not used, @q->root_rl serves all requests. If blkcg |
| * is used, root blkg allocates from @q->root_rl and all other |
| * blkgs from their own blkg->rl. Which one to use should be |
| * determined using bio_request_list(). |
| */ |
| struct request_list root_rl; |
| |
| request_fn_proc *request_fn; |
| make_request_fn *make_request_fn; |
| prep_rq_fn *prep_rq_fn; |
| unprep_rq_fn *unprep_rq_fn; |
| softirq_done_fn *softirq_done_fn; |
| rq_timed_out_fn *rq_timed_out_fn; |
| dma_drain_needed_fn *dma_drain_needed; |
| lld_busy_fn *lld_busy_fn; |
| |
| struct blk_mq_ops *mq_ops; |
| |
| unsigned int *mq_map; |
| |
| /* sw queues */ |
| struct blk_mq_ctx __percpu *queue_ctx; |
| unsigned int nr_queues; |
| |
| /* hw dispatch queues */ |
| struct blk_mq_hw_ctx **queue_hw_ctx; |
| unsigned int nr_hw_queues; |
| |
| /* |
| * Dispatch queue sorting |
| */ |
| sector_t end_sector; |
| struct request *boundary_rq; |
| |
| /* |
| * Delayed queue handling |
| */ |
| struct delayed_work delay_work; |
| |
| struct backing_dev_info backing_dev_info; |
| |
| /* |
| * The queue owner gets to use this for whatever they like. |
| * ll_rw_blk doesn't touch it. |
| */ |
| void *queuedata; |
| |
| /* |
| * various queue flags, see QUEUE_* below |
| */ |
| unsigned long queue_flags; |
| |
| /* |
| * ida allocated id for this queue. Used to index queues from |
| * ioctx. |
| */ |
| int id; |
| |
| /* |
| * queue needs bounce pages for pages above this limit |
| */ |
| gfp_t bounce_gfp; |
| |
| /* |
| * protects queue structures from reentrancy. ->__queue_lock should |
| * _never_ be used directly, it is queue private. always use |
| * ->queue_lock. |
| */ |
| spinlock_t __queue_lock; |
| spinlock_t *queue_lock; |
| |
| /* |
| * queue kobject |
| */ |
| struct kobject kobj; |
| |
| /* |
| * mq queue kobject |
| */ |
| struct kobject mq_kobj; |
| |
| #ifdef CONFIG_BLK_DEV_INTEGRITY |
| struct blk_integrity integrity; |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #ifdef CONFIG_PM |
| struct device *dev; |
| int rpm_status; |
| unsigned int nr_pending; |
| #endif |
| |
| /* |
| * queue settings |
| */ |
| unsigned long nr_requests; /* Max # of requests */ |
| unsigned int nr_congestion_on; |
| unsigned int nr_congestion_off; |
| unsigned int nr_batching; |
| |
| unsigned int dma_drain_size; |
| void *dma_drain_buffer; |
| unsigned int dma_pad_mask; |
| unsigned int dma_alignment; |
| |
| struct blk_queue_tag *queue_tags; |
| struct list_head tag_busy_list; |
| |
| unsigned int nr_sorted; |
| unsigned int in_flight[2]; |
| /* |
| * Number of active block driver functions for which blk_drain_queue() |
| * must wait. Must be incremented around functions that unlock the |
| * queue_lock internally, e.g. scsi_request_fn(). |
| */ |
| unsigned int request_fn_active; |
| |
| unsigned int rq_timeout; |
| struct timer_list timeout; |
| struct work_struct timeout_work; |
| struct list_head timeout_list; |
| |
| struct list_head icq_list; |
| #ifdef CONFIG_BLK_CGROUP |
| DECLARE_BITMAP (blkcg_pols, BLKCG_MAX_POLS); |
| 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 work_struct 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_SECDISCARD 17 /* supports SECDISCARD */ |
| #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_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_secdiscard(q) (blk_queue_discard(q) && \ |
| test_bit(QUEUE_FLAG_SECDISCARD, &(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)->cmd_flags & REQ_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) ((int)((rq)->cmd_flags & 1)) |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * We regard a request as sync, if either a read or a sync write |
| */ |
| static inline bool rw_is_sync(unsigned int rw_flags) |
| { |
| return !(rw_flags & REQ_WRITE) || (rw_flags & REQ_SYNC); |
| } |
| |
| static inline bool rq_is_sync(struct request *rq) |
| { |
| return rw_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 (rq->cmd_flags & REQ_NOMERGE_FLAGS) |
| return false; |
| |
| return true; |
| } |
| |
| static inline bool blk_check_merge_flags(unsigned int flags1, |
| unsigned int flags2) |
| { |
| if ((flags1 & REQ_DISCARD) != (flags2 & REQ_DISCARD)) |
| return false; |
| |
| if ((flags1 & REQ_SECURE) != (flags2 & REQ_SECURE)) |
| return false; |
| |
| if ((flags1 & REQ_WRITE_SAME) != (flags2 & REQ_WRITE_SAME)) |
| 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; |
| } |
| |
| /* |
| * 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 |
| |
| 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 struct request *blk_make_request(struct request_queue *, struct bio *, |
| gfp_t); |
| extern void blk_rq_set_block_pc(struct request *); |
| extern void blk_requeue_request(struct request_queue *, struct request *); |
| extern void blk_add_request_payload(struct request *rq, struct page *page, |
| int offset, unsigned int len); |
| 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 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 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_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, |
| unsigned int cmd_flags) |
| { |
| if (unlikely(cmd_flags & REQ_DISCARD)) |
| return min(q->limits.max_discard_sectors, UINT_MAX >> 9); |
| |
| if (unlikely(cmd_flags & REQ_WRITE_SAME)) |
| return q->limits.max_write_same_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) |
| { |
| 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 || (rq->cmd_flags & REQ_DISCARD)) |
| return blk_queue_get_max_sectors(q, rq->cmd_flags); |
| |
| return min(blk_max_size_offset(q, blk_rq_pos(rq)), |
| blk_queue_get_max_sectors(q, rq->cmd_flags)); |
| } |
| |
| 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; |
| } |
| |
| /* |
| * 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_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_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); |
| |
| 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) {} |
| extern 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 |
| |
| 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 0x01 /* secure discard */ |
| |
| 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_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, 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 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); |
| } |
| |
| 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); |
| |
| 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); |
| } |
| |
| struct work_struct; |
| int kblockd_schedule_work(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 __pmem *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 *, int rw); |
| 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 __pmem **, |
| pfn_t *); |
| 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 *); |
| #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 |