http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/linux/blkdev.h

#ifndef _LINUX_BLKDEV_H #define _LINUX_BLKDEV_H #include <linux/config.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 <asm/scatterlist.h> struct request_queue; typedef struct request_queue request_queue_t; struct elevator_queue; typedef struct elevator_queue elevator_t; struct request_pm_state; #define BLKDEV_MIN_RQ 4 #define BLKDEV_MAX_RQ 128 /* Default maximum */ /* * This is the per-process anticipatory I/O scheduler state. */ struct as_io_context { spinlock_t lock; void (*dtor)(struct as_io_context *aic); /* destructor */ void (*exit)(struct as_io_context *aic); /* called on task exit */ unsigned long state; atomic_t nr_queued; /* queued reads & sync writes */ atomic_t nr_dispatched; /* number of requests gone to the drivers */ /* IO History tracking */ /* Thinktime */ unsigned long last_end_request; unsigned long ttime_total; unsigned long ttime_samples; unsigned long ttime_mean; /* Layout pattern */ unsigned int seek_samples; sector_t last_request_pos; u64 seek_total; sector_t seek_mean; }; struct cfq_queue; struct cfq_io_context { /* * circular list of cfq_io_contexts belonging to a process io context */ struct list_head list; struct cfq_queue *cfqq; void *key; struct io_context *ioc; unsigned long last_end_request; unsigned long last_queue; unsigned long ttime_total; unsigned long ttime_samples; unsigned long ttime_mean; void (*dtor)(struct cfq_io_context *); void (*exit)(struct cfq_io_context *); }; /* * This is the per-process I/O subsystem state. It is refcounted and * kmalloc'ed. Currently all fields are modified in process io context * (apart from the atomic refcount), so require no locking. */ struct io_context { atomic_t refcount; struct task_struct *task; int (*set_ioprio)(struct io_context *, unsigned int); /* * For request batching */ unsigned long last_waited; /* Time last woken after wait for request */ int nr_batch_requests; /* Number of requests left in the batch */ struct as_io_context *aic; struct cfq_io_context *cic; }; void put_io_context(struct io_context *ioc); void exit_io_context(void); struct io_context *current_io_context(gfp_t gfp_flags); struct io_context *get_io_context(gfp_t gfp_flags); void copy_io_context(struct io_context **pdst, struct io_context **psrc); void swap_io_context(struct io_context **ioc1, struct io_context **ioc2); struct request; typedef void (rq_end_io_fn)(struct request *, int); struct request_list { int count[2]; int starved[2]; int elvpriv; mempool_t *rq_pool; wait_queue_head_t wait[2]; }; #define BLK_MAX_CDB 16 /* * try to put the fields that are referenced together in the same cacheline */ struct request { struct list_head queuelist; struct list_head donelist; unsigned long flags; /* see REQ_ bits below */ /* Maintain bio traversal state for part by part I/O submission. * hard_* are block layer internals, no driver should touch them! */ sector_t sector; /* next sector to submit */ unsigned long nr_sectors; /* no. of sectors left to submit */ /* no. of sectors left to submit in the current segment */ unsigned int current_nr_sectors; sector_t hard_sector; /* next sector to complete */ unsigned long hard_nr_sectors; /* no. of sectors left to complete */ /* no. of sectors left to complete in the current segment */ unsigned int hard_cur_sectors; struct bio *bio; struct bio *biotail; void *elevator_private; void *completion_data; unsigned short ioprio; int rq_status; /* should split this into a few status bits */ struct gendisk *rq_disk; int errors; unsigned long start_time; /* Number of scatter-gather DMA addr+len pairs after * physical address coalescing is performed. */ unsigned short nr_phys_segments; /* Number of scatter-gather addr+len pairs after * physical and DMA remapping hardware coalescing is performed. * This is the number of scatter-gather entries the driver * will actually have to deal with after DMA mapping is done. */ unsigned short nr_hw_segments; int tag; char *buffer; int ref_count; request_queue_t *q; struct request_list *rl; struct completion *waiting; void *special; /* * when request is used as a packet command carrier */ unsigned int cmd_len; unsigned char cmd[BLK_MAX_CDB]; unsigned int data_len; void *data; unsigned int sense_len; void *sense; unsigned int timeout; int retries; /* * For Power Management requests */ struct request_pm_state *pm; /* * completion callback. end_io_data should be folded in with waiting */ rq_end_io_fn *end_io; void *end_io_data; }; /* * first three bits match BIO_RW* bits, important */ enum rq_flag_bits { __REQ_RW, /* not set, read. set, write */ __REQ_FAILFAST, /* no low level driver retries */ __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_CMD, /* is a regular fs rw request */ __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 */ /* * for ATA/ATAPI devices */ __REQ_PC, /* packet command (special) */ __REQ_BLOCK_PC, /* queued down pc from block layer */ __REQ_SENSE, /* sense retrival */ __REQ_FAILED, /* set if the request failed */ __REQ_QUIET, /* don't worry about errors */ __REQ_SPECIAL, /* driver suplied command */ __REQ_DRIVE_CMD, __REQ_DRIVE_TASK, __REQ_DRIVE_TASKFILE, __REQ_PREEMPT, /* set for "ide_preempt" requests */ __REQ_PM_SUSPEND, /* suspend request */ __REQ_PM_RESUME, /* resume request */ __REQ_PM_SHUTDOWN, /* shutdown request */ __REQ_ORDERED_COLOR, /* is before or after barrier */ __REQ_NR_BITS, /* stops here */ }; #define REQ_RW (1 << __REQ_RW) #define REQ_FAILFAST (1 << __REQ_FAILFAST) #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_CMD (1 << __REQ_CMD) #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_PC (1 << __REQ_PC) #define REQ_BLOCK_PC (1 << __REQ_BLOCK_PC) #define REQ_SENSE (1 << __REQ_SENSE) #define REQ_FAILED (1 << __REQ_FAILED) #define REQ_QUIET (1 << __REQ_QUIET) #define REQ_SPECIAL (1 << __REQ_SPECIAL) #define REQ_DRIVE_CMD (1 << __REQ_DRIVE_CMD) #define REQ_DRIVE_TASK (1 << __REQ_DRIVE_TASK) #define REQ_DRIVE_TASKFILE (1 << __REQ_DRIVE_TASKFILE) #define REQ_PREEMPT (1 << __REQ_PREEMPT) #define REQ_PM_SUSPEND (1 << __REQ_PM_SUSPEND) #define REQ_PM_RESUME (1 << __REQ_PM_RESUME) #define REQ_PM_SHUTDOWN (1 << __REQ_PM_SHUTDOWN) #define REQ_ORDERED_COLOR (1 << __REQ_ORDERED_COLOR) /* * State information carried for REQ_PM_SUSPEND and REQ_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 int (merge_request_fn) (request_queue_t *, struct request *, struct bio *); typedef int (merge_requests_fn) (request_queue_t *, struct request *, struct request *); typedef void (request_fn_proc) (request_queue_t *q); typedef int (make_request_fn) (request_queue_t *q, struct bio *bio); typedef int (prep_rq_fn) (request_queue_t *, struct request *); typedef void (unplug_fn) (request_queue_t *); struct bio_vec; typedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *); typedef void (activity_fn) (void *data, int rw); typedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *); typedef void (prepare_flush_fn) (request_queue_t *, struct request *); typedef void (softirq_done_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 */ struct list_head busy_list; /* fifo list of 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 */ }; struct request_queue { /* * Together with queue_head for cacheline sharing */ struct list_head queue_head; struct request *last_merge; elevator_t *elevator; /* * the queue request freelist, one for reads and one for writes */ struct request_list rq; request_fn_proc *request_fn; merge_request_fn *back_merge_fn; merge_request_fn *front_merge_fn; merge_requests_fn *merge_requests_fn; make_request_fn *make_request_fn; prep_rq_fn *prep_rq_fn; unplug_fn *unplug_fn; merge_bvec_fn *merge_bvec_fn; activity_fn *activity_fn; issue_flush_fn *issue_flush_fn; prepare_flush_fn *prepare_flush_fn; softirq_done_fn *softirq_done_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; void *activity_data; /* * 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; unsigned int dma_alignment; struct blk_queue_tag *queue_tags; atomic_t refcnt; unsigned int nr_sorted; unsigned int in_flight; /* * sg stuff */ unsigned int sg_timeout; unsigned int sg_reserved_size; int node; /* * 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; unsigned int bi_size; }; #define RQ_INACTIVE (-1) #define RQ_ACTIVE 1 #define RQ_SCSI_BUSY 0xffff #define RQ_SCSI_DONE 0xfffe #define RQ_SCSI_DISCONNECTING 0xffe0 #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_READFULL 3 /* write queue has been filled */ #define QUEUE_FLAG_WRITEFULL 4 /* read 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 */ 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_NONE = 0x00, QUEUE_ORDERED_DRAIN = 0x01, QUEUE_ORDERED_TAG = 0x02, QUEUE_ORDERED_PREFLUSH = 0x10, QUEUE_ORDERED_POSTFLUSH = 0x20, QUEUE_ORDERED_FUA = 0x40, QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_FUA, QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_POSTFLUSH, QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG | QUEUE_ORDERED_PREFLUSH | QUEUE_ORDERED_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_flushing(q) ((q)->ordseq) #define blk_fs_request(rq) ((rq)->flags & REQ_CMD) #define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC) #define blk_noretry_request(rq) ((rq)->flags & REQ_FAILFAST) #define blk_rq_started(rq) ((rq)->flags & REQ_STARTED) #define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq)) #define blk_pm_suspend_request(rq) ((rq)->flags & REQ_PM_SUSPEND) #define blk_pm_resume_request(rq) ((rq)->flags & REQ_PM_RESUME) #define blk_pm_request(rq) \ ((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME)) #define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED) #define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER) #define blk_fua_rq(rq) ((rq)->flags & REQ_FUA) #define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist) #define rq_data_dir(rq) ((rq)->flags & 1) static inline int blk_queue_full(struct request_queue *q, int rw) { if (rw == READ) return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags); return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); } static inline void blk_set_queue_full(struct request_queue *q, int rw) { if (rw == READ) set_bit(QUEUE_FLAG_READFULL, &q->queue_flags); else set_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); } static inline void blk_clear_queue_full(struct request_queue *q, int rw) { if (rw == READ) clear_bit(QUEUE_FLAG_READFULL, &q->queue_flags); else clear_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags); } /* * 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)->flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq))) /* * noop, requests are automagically marked as active/inactive by I/O * scheduler -- see elv_next_request */ #define blk_queue_headactive(q, head_active) /* * 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 */ #define BLK_BOUNCE_HIGH ((u64)blk_max_low_pfn << PAGE_SHIFT) #define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT) #define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD) #ifdef CONFIG_MMU extern int init_emergency_isa_pool(void); extern void blk_queue_bounce(request_queue_t *q, struct bio **bio); #else static inline int init_emergency_isa_pool(void) { return 0; } static inline void blk_queue_bounce(request_queue_t *q, struct bio **bio) { } #endif /* CONFIG_MMU */ #define rq_for_each_bio(_bio, rq) \ if ((rq->bio)) \ for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next) struct sec_size { unsigned block_size; unsigned block_size_bits; }; 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_put_request(struct request *); extern void __blk_put_request(request_queue_t *, struct request *); extern void blk_end_sync_rq(struct request *rq, int error); extern struct request *blk_get_request(request_queue_t *, int, gfp_t); extern void blk_insert_request(request_queue_t *, struct request *, int, void *); extern void blk_requeue_request(request_queue_t *, struct request *); extern void blk_plug_device(request_queue_t *); extern int blk_remove_plug(request_queue_t *); extern void blk_recount_segments(request_queue_t *, struct bio *); extern int scsi_cmd_ioctl(struct file *, struct gendisk *, unsigned int, void __user *); extern void blk_start_queue(request_queue_t *q); extern void blk_stop_queue(request_queue_t *q); extern void blk_sync_queue(struct request_queue *q); extern void __blk_stop_queue(request_queue_t *q); extern void blk_run_queue(request_queue_t *); extern void blk_queue_activity_fn(request_queue_t *, activity_fn *, void *); extern int blk_rq_map_user(request_queue_t *, struct request *, void __user *, unsigned int); extern int blk_rq_unmap_user(struct bio *, unsigned int); extern int blk_rq_map_kern(request_queue_t *, struct request *, void *, unsigned int, gfp_t); extern int blk_rq_map_user_iov(request_queue_t *, struct request *, struct sg_iovec *, int); extern int blk_execute_rq(request_queue_t *, struct gendisk *, struct request *, int); extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *, struct request *, int, rq_end_io_fn *); static inline request_queue_t *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); } /* * end_request() and friends. Must be called with the request queue spinlock * acquired. All functions called within end_request() _must_be_ atomic. * * Several drivers define their own end_request and call * end_that_request_first() and end_that_request_last() * for parts of the original function. This prevents * code duplication in drivers. */ extern int end_that_request_first(struct request *, int, int); extern int end_that_request_chunk(struct request *, int, int); extern void end_that_request_last(struct request *, int); extern void end_request(struct request *req, int uptodate); extern void blk_complete_request(struct request *); static inline int rq_all_done(struct request *rq, unsigned int nr_bytes) { if (blk_fs_request(rq)) return (nr_bytes >= (rq->hard_nr_sectors << 9)); else if (blk_pc_request(rq)) return nr_bytes >= rq->data_len; return 0; } /* * end_that_request_first/chunk() takes an uptodate argument. we account * any value <= as an io error. 0 means -EIO for compatability reasons, * any other < 0 value is the direct error type. An uptodate value of * 1 indicates successful io completion */ #define end_io_error(uptodate) (unlikely((uptodate) <= 0)) static inline void blkdev_dequeue_request(struct request *req) { elv_dequeue_request(req->q, req); } /* * This should be in elevator.h, but that requires pulling in rq and q */ static inline void elv_dispatch_add_tail(struct request_queue *q, struct request *rq) { if (q->last_merge == rq) q->last_merge = NULL; q->nr_sorted--; q->end_sector = rq_end_sector(rq); q->boundary_rq = rq; list_add_tail(&rq->queuelist, &q->queue_head); } /* * Access functions for manipulating queue properties */ extern request_queue_t *blk_init_queue_node(request_fn_proc *rfn, spinlock_t *lock, int node_id); extern request_queue_t *blk_init_queue(request_fn_proc *, spinlock_t *); extern void blk_cleanup_queue(request_queue_t *); extern void blk_queue_make_request(request_queue_t *, make_request_fn *); extern void blk_queue_bounce_limit(request_queue_t *, u64); extern void blk_queue_max_sectors(request_queue_t *, unsigned int); extern void blk_queue_max_phys_segments(request_queue_t *, unsigned short); extern void blk_queue_max_hw_segments(request_queue_t *, unsigned short); extern void blk_queue_max_segment_size(request_queue_t *, unsigned int); extern void blk_queue_hardsect_size(request_queue_t *, unsigned short); extern void blk_queue_stack_limits(request_queue_t *t, request_queue_t *b); extern void blk_queue_segment_boundary(request_queue_t *, unsigned long); extern void blk_queue_prep_rq(request_queue_t *, prep_rq_fn *pfn); extern void blk_queue_merge_bvec(request_queue_t *, merge_bvec_fn *); extern void blk_queue_dma_alignment(request_queue_t *, int); extern void blk_queue_softirq_done(request_queue_t *, softirq_done_fn *); extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev); extern int blk_queue_ordered(request_queue_t *, unsigned, prepare_flush_fn *); extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *); extern int blk_do_ordered(request_queue_t *, struct request **); extern unsigned blk_ordered_cur_seq(request_queue_t *); extern unsigned blk_ordered_req_seq(struct request *); extern void blk_ordered_complete_seq(request_queue_t *, unsigned, int); extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *); extern void blk_dump_rq_flags(struct request *, char *); extern void generic_unplug_device(request_queue_t *); extern void __generic_unplug_device(request_queue_t *); extern long nr_blockdev_pages(void); int blk_get_queue(request_queue_t *); request_queue_t *blk_alloc_queue(gfp_t); request_queue_t *blk_alloc_queue_node(gfp_t, int); #define blk_put_queue(q) blk_cleanup_queue((q)) /* * tag stuff */ #define blk_queue_tag_depth(q) ((q)->queue_tags->busy) #define blk_queue_tag_queue(q) ((q)->queue_tags->busy < (q)->queue_tags->max_depth) #define blk_rq_tagged(rq) ((rq)->flags & REQ_QUEUED) extern int blk_queue_start_tag(request_queue_t *, struct request *); extern struct request *blk_queue_find_tag(request_queue_t *, int); extern void blk_queue_end_tag(request_queue_t *, struct request *); extern int blk_queue_init_tags(request_queue_t *, int, struct blk_queue_tag *); extern void blk_queue_free_tags(request_queue_t *); extern int blk_queue_resize_tags(request_queue_t *, int); extern void blk_queue_invalidate_tags(request_queue_t *); extern long blk_congestion_wait(int rw, long timeout); extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *); extern int blkdev_issue_flush(struct block_device *, sector_t *); #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 blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist) static inline int queue_hardsect_size(request_queue_t *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(request_queue_t *q) { int retval = 511; if (q && q->dma_alignment) retval = q->dma_alignment; return retval; } static inline int bdev_dma_aligment(struct block_device *bdev) { return queue_dma_alignment(bdev_get_queue(bdev)); } #define blk_finished_io(nsects) do { } while (0) #define blk_started_io(nsects) do { } while (0) /* 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 work_struct *work); void kblockd_flush(void); #ifdef CONFIG_LBD # include <asm/div64.h> # define sector_div(a, b) do_div(a, b) #else # define sector_div(n, b)( \ { \ int _res; \ _res = (n) % (b); \ (n) /= (b); \ _res; \ } \ ) #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) "-*") #endif