| #ifndef _LINUX_BLKDEV_H |
| #define _LINUX_BLKDEV_H |
| |
| #ifdef CONFIG_BLOCK |
| |
| #include <linux/sched.h> |
| #include <linux/major.h> |
| #include <linux/genhd.h> |
| #include <linux/list.h> |
| #include <linux/timer.h> |
| #include <linux/workqueue.h> |
| #include <linux/pagemap.h> |
| #include <linux/backing-dev.h> |
| #include <linux/wait.h> |
| #include <linux/mempool.h> |
| #include <linux/bio.h> |
| #include <linux/module.h> |
| #include <linux/stringify.h> |
| #include <linux/gfp.h> |
| #include <linux/bsg.h> |
| #include <linux/smp.h> |
| |
| #include <asm/scatterlist.h> |
| |
| struct scsi_ioctl_command; |
| |
| struct request_queue; |
| struct elevator_queue; |
| struct request_pm_state; |
| struct blk_trace; |
| struct request; |
| struct sg_io_hdr; |
| |
| #define BLKDEV_MIN_RQ 4 |
| #define BLKDEV_MAX_RQ 128 /* Default maximum */ |
| |
| struct request; |
| typedef void (rq_end_io_fn)(struct request *, int); |
| |
| struct request_list { |
| /* |
| * count[], starved[], and wait[] are indexed by |
| * BLK_RW_SYNC/BLK_RW_ASYNC |
| */ |
| int count[2]; |
| int starved[2]; |
| int elvpriv; |
| mempool_t *rq_pool; |
| wait_queue_head_t wait[2]; |
| }; |
| |
| /* |
| * request command types |
| */ |
| enum rq_cmd_type_bits { |
| REQ_TYPE_FS = 1, /* fs request */ |
| REQ_TYPE_BLOCK_PC, /* scsi command */ |
| REQ_TYPE_SENSE, /* sense request */ |
| REQ_TYPE_PM_SUSPEND, /* suspend request */ |
| REQ_TYPE_PM_RESUME, /* resume request */ |
| REQ_TYPE_PM_SHUTDOWN, /* shutdown request */ |
| REQ_TYPE_SPECIAL, /* driver defined type */ |
| /* |
| * for ATA/ATAPI devices. this really doesn't belong here, ide should |
| * use REQ_TYPE_SPECIAL and use rq->cmd[0] with the range of driver |
| * private REQ_LB opcodes to differentiate what type of request this is |
| */ |
| REQ_TYPE_ATA_TASKFILE, |
| REQ_TYPE_ATA_PC, |
| }; |
| |
| #define BLK_MAX_CDB 16 |
| |
| /* |
| * try to put the fields that are referenced together in the same cacheline. |
| * if you modify this structure, be sure to check block/blk-core.c:rq_init() |
| * as well! |
| */ |
| struct request { |
| struct list_head queuelist; |
| struct call_single_data csd; |
| |
| struct request_queue *q; |
| |
| unsigned int cmd_flags; |
| enum rq_cmd_type_bits 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; |
| |
| struct hlist_node hash; /* merge hash */ |
| /* |
| * 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 three elevator_private pointers. |
| */ |
| union { |
| void *elevator_private[3]; |
| struct { |
| unsigned int seq; |
| struct list_head list; |
| } flush; |
| }; |
| |
| struct gendisk *rq_disk; |
| struct hd_struct *part; |
| unsigned long start_time; |
| #ifdef CONFIG_BLK_CGROUP |
| 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; |
| |
| int ref_count; |
| |
| void *special; /* opaque pointer available for LLD use */ |
| char *buffer; /* kaddr of the current segment if available */ |
| |
| 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; |
| } |
| |
| /* |
| * State information carried for REQ_TYPE_PM_SUSPEND and REQ_TYPE_PM_RESUME |
| * requests. Some step values could eventually be made generic. |
| */ |
| struct request_pm_state |
| { |
| /* PM state machine step value, currently driver specific */ |
| int pm_step; |
| /* requested PM state value (S1, S2, S3, S4, ...) */ |
| u32 pm_state; |
| void* data; /* for driver use */ |
| }; |
| |
| #include <linux/elevator.h> |
| |
| typedef void (request_fn_proc) (struct request_queue *q); |
| typedef int (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; |
| struct bvec_merge_data { |
| struct block_device *bi_bdev; |
| sector_t bi_sector; |
| unsigned bi_size; |
| unsigned long bi_rw; |
| }; |
| typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *, |
| 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); |
| |
| 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 */ |
| }; |
| |
| #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 int max_hw_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 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; |
| }; |
| |
| struct request_queue |
| { |
| /* |
| * Together with queue_head for cacheline sharing |
| */ |
| struct list_head queue_head; |
| struct request *last_merge; |
| struct elevator_queue *elevator; |
| |
| /* |
| * the queue request freelist, one for reads and one for writes |
| */ |
| struct request_list rq; |
| |
| request_fn_proc *request_fn; |
| make_request_fn *make_request_fn; |
| prep_rq_fn *prep_rq_fn; |
| unprep_rq_fn *unprep_rq_fn; |
| merge_bvec_fn *merge_bvec_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; |
| |
| /* |
| * 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; |
| |
| /* |
| * queue needs bounce pages for pages above this limit |
| */ |
| gfp_t bounce_gfp; |
| |
| /* |
| * various queue flags, see QUEUE_* below |
| */ |
| unsigned long queue_flags; |
| |
| /* |
| * 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; |
| |
| /* |
| * queue settings |
| */ |
| unsigned long nr_requests; /* Max # of requests */ |
| unsigned int nr_congestion_on; |
| unsigned int nr_congestion_off; |
| unsigned int nr_batching; |
| |
| void *dma_drain_buffer; |
| unsigned int dma_drain_size; |
| 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]; |
| |
| unsigned int rq_timeout; |
| struct timer_list timeout; |
| struct list_head timeout_list; |
| |
| 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 |
| */ |
| unsigned int flush_flags; |
| unsigned int flush_not_queueable:1; |
| unsigned int flush_queue_delayed:1; |
| unsigned int flush_pending_idx:1; |
| unsigned int flush_running_idx:1; |
| unsigned long flush_pending_since; |
| struct list_head flush_queue[2]; |
| struct list_head flush_data_in_flight; |
| struct request flush_rq; |
| |
| struct mutex sysfs_lock; |
| |
| #if defined(CONFIG_BLK_DEV_BSG) |
| struct bsg_class_device bsg_dev; |
| #endif |
| |
| #ifdef CONFIG_BLK_DEV_THROTTLING |
| /* Throttle data */ |
| struct throtl_data *td; |
| #endif |
| }; |
| |
| #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_DEAD 5 /* queue being torn down */ |
| #define QUEUE_FLAG_ELVSWITCH 6 /* don't use elevator, just do FIFO */ |
| #define QUEUE_FLAG_BIDI 7 /* queue supports bidi requests */ |
| #define QUEUE_FLAG_NOMERGES 8 /* disable merge attempts */ |
| #define QUEUE_FLAG_SAME_COMP 9 /* force complete on same CPU */ |
| #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_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| (1 << QUEUE_FLAG_STACKABLE) | \ |
| (1 << QUEUE_FLAG_SAME_COMP) | \ |
| (1 << QUEUE_FLAG_ADD_RANDOM)) |
| |
| static inline int queue_is_locked(struct request_queue *q) |
| { |
| #ifdef CONFIG_SMP |
| spinlock_t *lock = q->queue_lock; |
| return lock && spin_is_locked(lock); |
| #else |
| return 1; |
| #endif |
| } |
| |
| 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) |
| { |
| WARN_ON_ONCE(!queue_is_locked(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) |
| { |
| WARN_ON_ONCE(!queue_is_locked(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) |
| { |
| WARN_ON_ONCE(!queue_is_locked(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) |
| { |
| WARN_ON_ONCE(!queue_is_locked(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_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 || \ |
| ((rq)->cmd_flags & REQ_DISCARD))) |
| |
| #define blk_pm_request(rq) \ |
| ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND || \ |
| (rq)->cmd_type == REQ_TYPE_PM_RESUME) |
| |
| #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) ((rq)->cmd_flags & 1) |
| |
| 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 int blk_queue_full(struct request_queue *q, int sync) |
| { |
| if (sync) |
| return test_bit(QUEUE_FLAG_SYNCFULL, &q->queue_flags); |
| return test_bit(QUEUE_FLAG_ASYNCFULL, &q->queue_flags); |
| } |
| |
| static inline void blk_set_queue_full(struct request_queue *q, int sync) |
| { |
| if (sync) |
| queue_flag_set(QUEUE_FLAG_SYNCFULL, q); |
| else |
| queue_flag_set(QUEUE_FLAG_ASYNCFULL, q); |
| } |
| |
| static inline void blk_clear_queue_full(struct request_queue *q, int sync) |
| { |
| if (sync) |
| queue_flag_clear(QUEUE_FLAG_SYNCFULL, q); |
| else |
| queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q); |
| } |
| |
| |
| /* |
| * mergeable request must not have _NOMERGE or _BARRIER bit set, nor may |
| * it already be started by driver. |
| */ |
| #define RQ_NOMERGE_FLAGS \ |
| (REQ_NOMERGE | REQ_STARTED | REQ_SOFTBARRIER | REQ_FLUSH | REQ_FUA) |
| #define rq_mergeable(rq) \ |
| (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
| (((rq)->cmd_flags & REQ_DISCARD) || \ |
| (rq)->cmd_type == REQ_TYPE_FS)) |
| |
| /* |
| * q->prep_rq_fn return values |
| */ |
| #define BLKPREP_OK 0 /* serve it */ |
| #define BLKPREP_KILL 1 /* fatal error, kill */ |
| #define BLKPREP_DEFER 2 /* leave on queue */ |
| |
| 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 { |
| int i; |
| 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.i) |
| |
| #define rq_iter_last(rq, _iter) \ |
| (_iter.bio->bi_next == NULL && _iter.i == _iter.bio->bi_vcnt-1) |
| |
| #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 void 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_insert_request(struct request_queue *, struct request *, int, void *); |
| extern void blk_requeue_request(struct request_queue *, struct request *); |
| extern void blk_add_request_payload(struct request *rq, struct page *page, |
| unsigned int len); |
| extern int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
| 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_recount_segments(struct request_queue *, struct bio *); |
| 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 *); |
| |
| /* |
| * A queue has just exitted congestion. Note this in the global counter of |
| * congested queues, and wake up anyone who was waiting for requests to be |
| * put back. |
| */ |
| static inline void blk_clear_queue_congested(struct request_queue *q, int sync) |
| { |
| clear_bdi_congested(&q->backing_dev_info, sync); |
| } |
| |
| /* |
| * A queue has just entered congestion. Flag that in the queue's VM-visible |
| * state flags and increment the global gounter of congested queues. |
| */ |
| static inline void blk_set_queue_congested(struct request_queue *q, int sync) |
| { |
| set_bdi_congested(&q->backing_dev_info, sync); |
| } |
| |
| extern void blk_start_queue(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(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 *, struct sg_iovec *, int, |
| unsigned int, 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 *); |
| |
| static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
| { |
| return bdev->bd_disk->queue; |
| } |
| |
| /* |
| * 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; |
| } |
| |
| /* |
| * 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 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_abort_queue(struct request_queue *); |
| 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_limits_max_hw_sectors(struct queue_limits *, unsigned int); |
| extern void blk_queue_max_hw_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_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 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_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_merge_bvec(struct request_queue *, merge_bvec_fn *); |
| 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(struct request_queue *q, unsigned int flush); |
| extern void blk_queue_flush_queueable(struct request_queue *q, bool queueable); |
| 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); |
| |
| int 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 *); |
| |
| struct blk_plug { |
| unsigned long magic; |
| struct list_head list; |
| struct list_head cb_list; |
| unsigned int should_sort; |
| }; |
| struct blk_plug_cb { |
| struct list_head list; |
| void (*callback)(struct blk_plug_cb *); |
| }; |
| |
| 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->cb_list)); |
| } |
| |
| /* |
| * tag stuff |
| */ |
| #define blk_rq_tagged(rq) ((rq)->cmd_flags & REQ_QUEUED) |
| 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 *); |
| 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); |
| 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_zeroout(struct block_device *bdev, sector_t sector, |
| sector_t nr_sects, gfp_t gfp_mask); |
| 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); |
| } |
| |
| 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 = 1024, |
| 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 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 << 9) & (granularity - 1); |
| |
| return (granularity + lim->alignment_offset - alignment) |
| & (granularity - 1); |
| } |
| |
| 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 = (sector << 9) & (lim->discard_granularity - 1); |
| |
| if (!lim->max_discard_sectors) |
| return 0; |
| |
| return (lim->discard_granularity + lim->discard_alignment - alignment) |
| & (lim->discard_granularity - 1); |
| } |
| |
| 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 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 !q->flush_not_queueable; |
| } |
| |
| 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) |
| { |
| page_cache_release(p.v); |
| } |
| |
| struct work_struct; |
| int kblockd_schedule_work(struct request_queue *q, struct work_struct *work); |
| |
| #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 |
| |
| #ifdef CONFIG_BLK_DEV_THROTTLING |
| extern int blk_throtl_init(struct request_queue *q); |
| extern void blk_throtl_exit(struct request_queue *q); |
| extern int blk_throtl_bio(struct request_queue *q, struct bio **bio); |
| #else /* CONFIG_BLK_DEV_THROTTLING */ |
| static inline int blk_throtl_bio(struct request_queue *q, struct bio **bio) |
| { |
| return 0; |
| } |
| |
| static inline int blk_throtl_init(struct request_queue *q) { return 0; } |
| static inline int blk_throtl_exit(struct request_queue *q) { return 0; } |
| #endif /* CONFIG_BLK_DEV_THROTTLING */ |
| |
| #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) |
| |
| #define INTEGRITY_FLAG_READ 2 /* verify data integrity on read */ |
| #define INTEGRITY_FLAG_WRITE 4 /* generate data integrity on write */ |
| |
| struct blk_integrity_exchg { |
| void *prot_buf; |
| void *data_buf; |
| sector_t sector; |
| unsigned int data_size; |
| unsigned short sector_size; |
| const char *disk_name; |
| }; |
| |
| typedef void (integrity_gen_fn) (struct blk_integrity_exchg *); |
| typedef int (integrity_vrfy_fn) (struct blk_integrity_exchg *); |
| typedef void (integrity_set_tag_fn) (void *, void *, unsigned int); |
| typedef void (integrity_get_tag_fn) (void *, void *, unsigned int); |
| |
| struct blk_integrity { |
| integrity_gen_fn *generate_fn; |
| integrity_vrfy_fn *verify_fn; |
| integrity_set_tag_fn *set_tag_fn; |
| integrity_get_tag_fn *get_tag_fn; |
| |
| unsigned short flags; |
| unsigned short tuple_size; |
| unsigned short sector_size; |
| unsigned short tag_size; |
| |
| const char *name; |
| |
| struct kobject kobj; |
| }; |
| |
| extern bool blk_integrity_is_initialized(struct gendisk *); |
| extern int 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 int blk_integrity_merge_rq(struct request_queue *, struct request *, |
| struct request *); |
| extern int blk_integrity_merge_bio(struct request_queue *, struct request *, |
| struct bio *); |
| |
| static inline |
| struct blk_integrity *bdev_get_integrity(struct block_device *bdev) |
| { |
| return bdev->bd_disk->integrity; |
| } |
| |
| static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk) |
| { |
| return disk->integrity; |
| } |
| |
| static inline int blk_integrity_rq(struct request *rq) |
| { |
| if (rq->bio == NULL) |
| return 0; |
| |
| return bio_integrity(rq->bio); |
| } |
| |
| 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; |
| } |
| |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #define blk_integrity_rq(rq) (0) |
| #define blk_rq_count_integrity_sg(a, b) (0) |
| #define blk_rq_map_integrity_sg(a, b, c) (0) |
| #define bdev_get_integrity(a) (0) |
| #define blk_get_integrity(a) (0) |
| #define blk_integrity_compare(a, b) (0) |
| #define blk_integrity_register(a, b) (0) |
| #define blk_integrity_unregister(a) do { } while (0) |
| #define blk_queue_max_integrity_segments(a, b) do { } while (0) |
| #define queue_max_integrity_segments(a) (0) |
| #define blk_integrity_merge_rq(a, b, c) (0) |
| #define blk_integrity_merge_bio(a, b, c) (0) |
| #define blk_integrity_is_initialized(a) (0) |
| |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| struct block_device_operations { |
| int (*open) (struct block_device *, fmode_t); |
| int (*release) (struct gendisk *, fmode_t); |
| int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| int (*direct_access) (struct block_device *, sector_t, |
| void **, unsigned 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; |
| }; |
| |
| extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int, |
| unsigned long); |
| #else /* CONFIG_BLOCK */ |
| /* |
| * 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; |
| } |
| |
| #endif /* CONFIG_BLOCK */ |
| |
| #endif |