| #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 */ |
| REQ_TYPE_LINUX_BLOCK, /* generic block layer message */ |
| /* |
| * 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, |
| }; |
| |
| enum { |
| BLK_RW_ASYNC = 0, |
| BLK_RW_SYNC = 1, |
| }; |
| |
| /* |
| * For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being |
| * sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a |
| * SCSI cdb. |
| * |
| * 0x00 -> 0x3f are driver private, to be used for whatever purpose they need, |
| * typically to differentiate REQ_TYPE_SPECIAL requests. |
| * |
| */ |
| enum { |
| REQ_LB_OP_EJECT = 0x40, /* eject request */ |
| REQ_LB_OP_FLUSH = 0x41, /* flush request */ |
| REQ_LB_OP_DISCARD = 0x42, /* discard sectors */ |
| }; |
| |
| /* |
| * request type modified bits. first two bits match BIO_RW* bits, important |
| */ |
| enum rq_flag_bits { |
| __REQ_RW, /* not set, read. set, write */ |
| __REQ_FAILFAST_DEV, /* no driver retries of device errors */ |
| __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */ |
| __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */ |
| __REQ_DISCARD, /* request to discard sectors */ |
| __REQ_SORTED, /* elevator knows about this request */ |
| __REQ_SOFTBARRIER, /* may not be passed by ioscheduler */ |
| __REQ_HARDBARRIER, /* may not be passed by drive either */ |
| __REQ_FUA, /* forced unit access */ |
| __REQ_NOMERGE, /* don't touch this for merging */ |
| __REQ_STARTED, /* drive already may have started this one */ |
| __REQ_DONTPREP, /* don't call prep for this one */ |
| __REQ_QUEUED, /* uses queueing */ |
| __REQ_ELVPRIV, /* elevator private data attached */ |
| __REQ_FAILED, /* set if the request failed */ |
| __REQ_QUIET, /* don't worry about errors */ |
| __REQ_PREEMPT, /* set for "ide_preempt" requests */ |
| __REQ_ORDERED_COLOR, /* is before or after barrier */ |
| __REQ_RW_SYNC, /* request is sync (sync write or read) */ |
| __REQ_ALLOCED, /* request came from our alloc pool */ |
| __REQ_RW_META, /* metadata io request */ |
| __REQ_COPY_USER, /* contains copies of user pages */ |
| __REQ_INTEGRITY, /* integrity metadata has been remapped */ |
| __REQ_NOIDLE, /* Don't anticipate more IO after this one */ |
| __REQ_IO_STAT, /* account I/O stat */ |
| __REQ_NR_BITS, /* stops here */ |
| }; |
| |
| #define REQ_RW (1 << __REQ_RW) |
| #define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV) |
| #define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT) |
| #define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER) |
| #define REQ_DISCARD (1 << __REQ_DISCARD) |
| #define REQ_SORTED (1 << __REQ_SORTED) |
| #define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER) |
| #define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER) |
| #define REQ_FUA (1 << __REQ_FUA) |
| #define REQ_NOMERGE (1 << __REQ_NOMERGE) |
| #define REQ_STARTED (1 << __REQ_STARTED) |
| #define REQ_DONTPREP (1 << __REQ_DONTPREP) |
| #define REQ_QUEUED (1 << __REQ_QUEUED) |
| #define REQ_ELVPRIV (1 << __REQ_ELVPRIV) |
| #define REQ_FAILED (1 << __REQ_FAILED) |
| #define REQ_QUIET (1 << __REQ_QUIET) |
| #define REQ_PREEMPT (1 << __REQ_PREEMPT) |
| #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) |
| #define REQ_RW_SYNC (1 << __REQ_RW_SYNC) |
| #define REQ_ALLOCED (1 << __REQ_ALLOCED) |
| #define REQ_RW_META (1 << __REQ_RW_META) |
| #define REQ_COPY_USER (1 << __REQ_COPY_USER) |
| #define REQ_INTEGRITY (1 << __REQ_INTEGRITY) |
| #define REQ_NOIDLE (1 << __REQ_NOIDLE) |
| #define REQ_IO_STAT (1 << __REQ_IO_STAT) |
| |
| #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; |
| int cpu; |
| |
| struct request_queue *q; |
| |
| unsigned int cmd_flags; |
| enum rq_cmd_type_bits cmd_type; |
| unsigned long atomic_flags; |
| |
| /* the following two fields are internal, NEVER access directly */ |
| sector_t __sector; /* sector cursor */ |
| unsigned int __data_len; /* total data len */ |
| |
| 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; |
| }; |
| |
| /* |
| * two pointers are available for the IO schedulers, if they need |
| * more they have to dynamically allocate it. |
| */ |
| void *elevator_private; |
| void *elevator_private2; |
| |
| struct gendisk *rq_disk; |
| unsigned long start_time; |
| |
| /* Number of scatter-gather DMA addr+len pairs after |
| * physical address coalescing is performed. |
| */ |
| unsigned short nr_phys_segments; |
| |
| unsigned short ioprio; |
| |
| void *special; /* opaque pointer available for LLD use */ |
| char *buffer; /* kaddr of the current segment if available */ |
| |
| int tag; |
| int errors; |
| |
| int ref_count; |
| |
| /* |
| * when request is used as a packet command carrier |
| */ |
| unsigned short cmd_len; |
| unsigned char __cmd[BLK_MAX_CDB]; |
| unsigned char *cmd; |
| |
| 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 (unplug_fn) (struct request_queue *); |
| typedef int (prepare_discard_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 (prepare_flush_fn) (struct request_queue *, struct request *); |
| 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 blk_cmd_filter { |
| unsigned long read_ok[BLK_SCSI_CMD_PER_LONG]; |
| unsigned long write_ok[BLK_SCSI_CMD_PER_LONG]; |
| struct kobject kobj; |
| }; |
| |
| 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; |
| unplug_fn *unplug_fn; |
| prepare_discard_fn *prepare_discard_fn; |
| merge_bvec_fn *merge_bvec_fn; |
| prepare_flush_fn *prepare_flush_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; |
| |
| /* |
| * Auto-unplugging state |
| */ |
| struct timer_list unplug_timer; |
| int unplug_thresh; /* After this many requests */ |
| unsigned long unplug_delay; /* After this many jiffies */ |
| struct work_struct unplug_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 |
| */ |
| unsigned long bounce_pfn; |
| 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; |
| |
| unsigned int max_sectors; |
| unsigned int max_hw_sectors; |
| unsigned short max_phys_segments; |
| unsigned short max_hw_segments; |
| unsigned short hardsect_size; |
| unsigned int max_segment_size; |
| |
| unsigned long seg_boundary_mask; |
| 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; |
| |
| /* |
| * 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 |
| /* |
| * reserved for flush operations |
| */ |
| unsigned int ordered, next_ordered, ordseq; |
| int orderr, ordcolor; |
| struct request pre_flush_rq, bar_rq, post_flush_rq; |
| struct request *orig_bar_rq; |
| |
| struct mutex sysfs_lock; |
| |
| #if defined(CONFIG_BLK_DEV_BSG) |
| struct bsg_class_device bsg_dev; |
| #endif |
| struct blk_cmd_filter cmd_filter; |
| }; |
| |
| #define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */ |
| #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_REENTER 6 /* Re-entrancy avoidance */ |
| #define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */ |
| #define QUEUE_FLAG_ELVSWITCH 8 /* don't use elevator, just do FIFO */ |
| #define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */ |
| #define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */ |
| #define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */ |
| #define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */ |
| #define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */ |
| #define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */ |
| #define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */ |
| #define QUEUE_FLAG_IO_STAT 15 /* do IO stats */ |
| |
| #define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \ |
| (1 << QUEUE_FLAG_CLUSTER) | \ |
| (1 << QUEUE_FLAG_STACKABLE)) |
| |
| 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); |
| } |
| |
| enum { |
| /* |
| * Hardbarrier is supported with one of the following methods. |
| * |
| * NONE : hardbarrier unsupported |
| * DRAIN : ordering by draining is enough |
| * DRAIN_FLUSH : ordering by draining w/ pre and post flushes |
| * DRAIN_FUA : ordering by draining w/ pre flush and FUA write |
| * TAG : ordering by tag is enough |
| * TAG_FLUSH : ordering by tag w/ pre and post flushes |
| * TAG_FUA : ordering by tag w/ pre flush and FUA write |
| */ |
| QUEUE_ORDERED_BY_DRAIN = 0x01, |
| QUEUE_ORDERED_BY_TAG = 0x02, |
| QUEUE_ORDERED_DO_PREFLUSH = 0x10, |
| QUEUE_ORDERED_DO_BAR = 0x20, |
| QUEUE_ORDERED_DO_POSTFLUSH = 0x40, |
| QUEUE_ORDERED_DO_FUA = 0x80, |
| |
| QUEUE_ORDERED_NONE = 0x00, |
| |
| QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN | |
| QUEUE_ORDERED_DO_BAR, |
| QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | |
| QUEUE_ORDERED_DO_PREFLUSH | |
| QUEUE_ORDERED_DO_POSTFLUSH, |
| QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | |
| QUEUE_ORDERED_DO_PREFLUSH | |
| QUEUE_ORDERED_DO_FUA, |
| |
| QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG | |
| QUEUE_ORDERED_DO_BAR, |
| QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | |
| QUEUE_ORDERED_DO_PREFLUSH | |
| QUEUE_ORDERED_DO_POSTFLUSH, |
| QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | |
| QUEUE_ORDERED_DO_PREFLUSH | |
| QUEUE_ORDERED_DO_FUA, |
| |
| /* |
| * Ordered operation sequence |
| */ |
| QUEUE_ORDSEQ_STARTED = 0x01, /* flushing in progress */ |
| QUEUE_ORDSEQ_DRAIN = 0x02, /* waiting for the queue to be drained */ |
| QUEUE_ORDSEQ_PREFLUSH = 0x04, /* pre-flushing in progress */ |
| QUEUE_ORDSEQ_BAR = 0x08, /* original barrier req in progress */ |
| QUEUE_ORDSEQ_POSTFLUSH = 0x10, /* post-flushing in progress */ |
| QUEUE_ORDSEQ_DONE = 0x20, |
| }; |
| |
| #define blk_queue_plugged(q) test_bit(QUEUE_FLAG_PLUGGED, &(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_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_flushing(q) ((q)->ordseq) |
| #define blk_queue_stackable(q) \ |
| test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags) |
| |
| #define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS) |
| #define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC) |
| #define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL) |
| #define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE) |
| |
| #define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV) |
| #define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT) |
| #define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER) |
| #define blk_noretry_request(rq) (blk_failfast_dev(rq) || \ |
| blk_failfast_transport(rq) || \ |
| blk_failfast_driver(rq)) |
| #define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED) |
| #define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT) |
| |
| #define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq))) |
| |
| #define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND) |
| #define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME) |
| #define blk_pm_request(rq) \ |
| (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq)) |
| |
| #define blk_rq_cpu_valid(rq) ((rq)->cpu != -1) |
| #define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED) |
| #define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER) |
| #define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA) |
| #define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD) |
| #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) |
| |
| /* |
| * 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_RW) || (rw_flags & REQ_RW_SYNC); |
| } |
| |
| static inline bool rq_is_sync(struct request *rq) |
| { |
| return rw_is_sync(rq->cmd_flags); |
| } |
| |
| #define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META) |
| #define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE) |
| |
| 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_HARDBARRIER | REQ_SOFTBARRIER) |
| #define rq_mergeable(rq) \ |
| (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \ |
| (blk_discard_rq(rq) || blk_fs_request((rq)))) |
| |
| /* |
| * 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 (ISA_DMA_THRESHOLD) |
| |
| /* |
| * 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; |
| }; |
| |
| 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) |
| |
| extern int blk_register_queue(struct gendisk *disk); |
| extern void blk_unregister_queue(struct gendisk *disk); |
| extern void register_disk(struct gendisk *dev); |
| 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 int blk_rq_check_limits(struct request_queue *q, struct request *rq); |
| extern int blk_lld_busy(struct request_queue *q); |
| extern int blk_insert_cloned_request(struct request_queue *q, |
| struct request *rq); |
| extern void blk_plug_device(struct request_queue *); |
| extern void blk_plug_device_unlocked(struct request_queue *); |
| extern int blk_remove_plug(struct request_queue *); |
| 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 rw) |
| { |
| clear_bdi_congested(&q->backing_dev_info, rw); |
| } |
| |
| /* |
| * 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 rw) |
| { |
| set_bdi_congested(&q->backing_dev_info, rw); |
| } |
| |
| 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 *); |
| extern void blk_run_queue(struct request_queue *); |
| 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 *); |
| extern void blk_unplug(struct request_queue *q); |
| |
| static inline struct request_queue *bdev_get_queue(struct block_device *bdev) |
| { |
| return bdev->bd_disk->queue; |
| } |
| |
| static inline void blk_run_backing_dev(struct backing_dev_info *bdi, |
| struct page *page) |
| { |
| if (bdi && bdi->unplug_io_fn) |
| bdi->unplug_io_fn(bdi, page); |
| } |
| |
| static inline void blk_run_address_space(struct address_space *mapping) |
| { |
| if (mapping) |
| blk_run_backing_dev(mapping->backing_dev_info, 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_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; |
| } |
| |
| 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(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 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 *); |
| |
| /* |
| * 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 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_sectors(struct request_queue *, unsigned int); |
| extern void blk_queue_max_phys_segments(struct request_queue *, unsigned short); |
| extern void blk_queue_max_hw_segments(struct request_queue *, unsigned short); |
| extern void blk_queue_max_segment_size(struct request_queue *, unsigned int); |
| extern void blk_queue_hardsect_size(struct request_queue *, unsigned short); |
| 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_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_set_discard(struct request_queue *, prepare_discard_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 struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); |
| extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *); |
| extern bool blk_do_ordered(struct request_queue *, struct request **); |
| extern unsigned blk_ordered_cur_seq(struct request_queue *); |
| extern unsigned blk_ordered_req_seq(struct request *); |
| extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int); |
| |
| extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *); |
| extern void blk_dump_rq_flags(struct request *, char *); |
| extern void generic_unplug_device(struct request_queue *); |
| 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 *); |
| |
| /* |
| * 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]; |
| } |
| |
| extern int blkdev_issue_flush(struct block_device *, sector_t *); |
| extern int blkdev_issue_discard(struct block_device *, |
| sector_t sector, sector_t nr_sects, gfp_t); |
| |
| static inline int sb_issue_discard(struct super_block *sb, |
| sector_t block, sector_t nr_blocks) |
| { |
| block <<= (sb->s_blocksize_bits - 9); |
| nr_blocks <<= (sb->s_blocksize_bits - 9); |
| return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL); |
| } |
| |
| /* |
| * command filter functions |
| */ |
| extern int blk_verify_command(struct blk_cmd_filter *filter, |
| unsigned char *cmd, fmode_t has_write_perm); |
| extern void blk_unregister_filter(struct gendisk *disk); |
| extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter); |
| |
| #define MAX_PHYS_SEGMENTS 128 |
| #define MAX_HW_SEGMENTS 128 |
| #define SAFE_MAX_SECTORS 255 |
| #define BLK_DEF_MAX_SECTORS 1024 |
| |
| #define MAX_SEGMENT_SIZE 65536 |
| |
| #define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL |
| |
| #define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) |
| |
| static inline int queue_hardsect_size(struct request_queue *q) |
| { |
| int retval = 512; |
| |
| if (q && q->hardsect_size) |
| retval = q->hardsect_size; |
| |
| return retval; |
| } |
| |
| static inline int bdev_hardsect_size(struct block_device *bdev) |
| { |
| return queue_hardsect_size(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, void *addr, |
| unsigned int len) |
| { |
| unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask; |
| return !((unsigned long)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; |
| } |
| |
| 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); |
| |
| #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 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 *, struct scatterlist *); |
| extern int blk_rq_count_integrity_sg(struct request *); |
| |
| 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); |
| } |
| |
| #else /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| #define blk_integrity_rq(rq) (0) |
| #define blk_rq_count_integrity_sg(a) (0) |
| #define blk_rq_map_integrity_sg(a, b) (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); |
| |
| #endif /* CONFIG_BLK_DEV_INTEGRITY */ |
| |
| struct block_device_operations { |
| int (*open) (struct block_device *, fmode_t); |
| int (*release) (struct gendisk *, fmode_t); |
| int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long); |
| 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 *); |
| int (*media_changed) (struct gendisk *); |
| int (*revalidate_disk) (struct gendisk *); |
| int (*getgeo)(struct block_device *, struct hd_geometry *); |
| 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; |
| } |
| |
| #endif /* CONFIG_BLOCK */ |
| |
| #endif |