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authorSrikant Patnaik2015-01-11 12:28:04 +0530
committerSrikant Patnaik2015-01-11 12:28:04 +0530
commit871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch)
tree8718f573808810c2a1e8cb8fb6ac469093ca2784 /ANDROID_3.4.5/include/linux/blkdev.h
parent9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff)
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized. Changes are basically to make it look like kernel structure.
Diffstat (limited to 'ANDROID_3.4.5/include/linux/blkdev.h')
-rw-r--r--ANDROID_3.4.5/include/linux/blkdev.h1421
1 files changed, 0 insertions, 1421 deletions
diff --git a/ANDROID_3.4.5/include/linux/blkdev.h b/ANDROID_3.4.5/include/linux/blkdev.h
deleted file mode 100644
index 4d4ac24a..00000000
--- a/ANDROID_3.4.5/include/linux/blkdev.h
+++ /dev/null
@@ -1,1421 +0,0 @@
-#ifndef _LINUX_BLKDEV_H
-#define _LINUX_BLKDEV_H
-
-#include <linux/sched.h>
-
-#ifdef CONFIG_BLOCK
-
-#include <linux/major.h>
-#include <linux/genhd.h>
-#include <linux/list.h>
-#include <linux/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/stringify.h>
-#include <linux/gfp.h>
-#include <linux/bsg.h>
-#include <linux/smp.h>
-
-#include <asm/scatterlist.h>
-
-struct module;
-struct scsi_ioctl_command;
-
-struct request_queue;
-struct elevator_queue;
-struct request_pm_state;
-struct blk_trace;
-struct request;
-struct sg_io_hdr;
-struct bsg_job;
-
-#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:blk_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 elevator data.
- */
- union {
- struct {
- struct io_cq *icq;
- void *priv[2];
- } elv;
-
- struct {
- unsigned int seq;
- struct list_head list;
- rq_end_io_fn *saved_end_io;
- } flush;
- };
-
- struct gendisk *rq_disk;
- struct hd_struct *part;
- unsigned long start_time;
-#ifdef CONFIG_BLK_CGROUP
- 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 void (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);
-typedef int (bsg_job_fn) (struct bsg_job *);
-
-enum blk_eh_timer_return {
- BLK_EH_NOT_HANDLED,
- BLK_EH_HANDLED,
- BLK_EH_RESET_TIMER,
-};
-
-typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
-
-enum blk_queue_state {
- Queue_down,
- Queue_up,
-};
-
-struct blk_queue_tag {
- struct request **tag_index; /* map of busy tags */
- unsigned long *tag_map; /* bit map of free/busy tags */
- int busy; /* current depth */
- int max_depth; /* what we will send to device */
- int real_max_depth; /* what the array can hold */
- atomic_t refcnt; /* map can be shared */
-};
-
-#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;
-
- /*
- * various queue flags, see QUEUE_* below
- */
- unsigned long queue_flags;
-
- /*
- * ida allocated id for this queue. Used to index queues from
- * ioctx.
- */
- int id;
-
- /*
- * queue needs bounce pages for pages above this limit
- */
- gfp_t bounce_gfp;
-
- /*
- * protects queue structures from reentrancy. ->__queue_lock should
- * _never_ be used directly, it is queue private. always use
- * ->queue_lock.
- */
- spinlock_t __queue_lock;
- spinlock_t *queue_lock;
-
- /*
- * queue kobject
- */
- struct kobject kobj;
-
- /*
- * queue settings
- */
- unsigned long nr_requests; /* Max # of requests */
- unsigned int nr_congestion_on;
- unsigned int nr_congestion_off;
- unsigned int nr_batching;
-
- unsigned int dma_drain_size;
- void *dma_drain_buffer;
- unsigned int dma_pad_mask;
- unsigned int dma_alignment;
-
- struct blk_queue_tag *queue_tags;
- struct list_head tag_busy_list;
-
- unsigned int nr_sorted;
- unsigned int in_flight[2];
-
- unsigned int rq_timeout;
- struct timer_list timeout;
- struct list_head timeout_list;
-
- struct list_head icq_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)
- bsg_job_fn *bsg_job_fn;
- int bsg_job_size;
- struct bsg_class_device bsg_dev;
-#endif
-
-#ifdef CONFIG_BLK_DEV_THROTTLING
- /* Throttle data */
- struct throtl_data *td;
-#endif
-};
-
-#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 /* complete on same CPU-group */
-#define QUEUE_FLAG_FAIL_IO 10 /* fake timeout */
-#define QUEUE_FLAG_STACKABLE 11 /* supports request stacking */
-#define QUEUE_FLAG_NONROT 12 /* non-rotational device (SSD) */
-#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
-#define QUEUE_FLAG_IO_STAT 13 /* do IO stats */
-#define QUEUE_FLAG_DISCARD 14 /* supports DISCARD */
-#define QUEUE_FLAG_NOXMERGES 15 /* No extended merges */
-#define QUEUE_FLAG_ADD_RANDOM 16 /* Contributes to random pool */
-#define QUEUE_FLAG_SECDISCARD 17 /* supports SECDISCARD */
-#define QUEUE_FLAG_SAME_FORCE 18 /* force complete on same CPU */
-
-#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
- (1 << QUEUE_FLAG_STACKABLE) | \
- (1 << QUEUE_FLAG_SAME_COMP) | \
- (1 << QUEUE_FLAG_ADD_RANDOM))
-
-static inline void queue_lockdep_assert_held(struct request_queue *q)
-{
- if (q->queue_lock)
- lockdep_assert_held(q->queue_lock);
-}
-
-static inline void queue_flag_set_unlocked(unsigned int flag,
- struct request_queue *q)
-{
- __set_bit(flag, &q->queue_flags);
-}
-
-static inline int queue_flag_test_and_clear(unsigned int flag,
- struct request_queue *q)
-{
- queue_lockdep_assert_held(q);
-
- if (test_bit(flag, &q->queue_flags)) {
- __clear_bit(flag, &q->queue_flags);
- return 1;
- }
-
- return 0;
-}
-
-static inline int queue_flag_test_and_set(unsigned int flag,
- struct request_queue *q)
-{
- queue_lockdep_assert_held(q);
-
- if (!test_bit(flag, &q->queue_flags)) {
- __set_bit(flag, &q->queue_flags);
- return 0;
- }
-
- return 1;
-}
-
-static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
-{
- queue_lockdep_assert_held(q);
- __set_bit(flag, &q->queue_flags);
-}
-
-static inline void queue_flag_clear_unlocked(unsigned int flag,
- struct request_queue *q)
-{
- __clear_bit(flag, &q->queue_flags);
-}
-
-static inline int queue_in_flight(struct request_queue *q)
-{
- return q->in_flight[0] + q->in_flight[1];
-}
-
-static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
-{
- queue_lockdep_assert_held(q);
- __clear_bit(flag, &q->queue_flags);
-}
-
-#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
-#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
-#define blk_queue_dead(q) test_bit(QUEUE_FLAG_DEAD, &(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_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_verify_blk_ioctl(struct block_device *, unsigned int);
-extern int scsi_cmd_blk_ioctl(struct block_device *, fmode_t,
- unsigned int, void __user *);
-extern int scsi_cmd_ioctl(struct request_queue *, struct gendisk *, fmode_t,
- unsigned int, void __user *);
-extern int sg_scsi_ioctl(struct request_queue *, struct gendisk *, fmode_t,
- struct scsi_ioctl_command __user *);
-
-extern void blk_queue_bio(struct request_queue *q, struct bio *bio);
-
-/*
- * 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 void blk_set_stacking_limits(struct queue_limits *lim);
-extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
- sector_t offset);
-extern int bdev_stack_limits(struct queue_limits *t, struct block_device *bdev,
- sector_t offset);
-extern void disk_stack_limits(struct gendisk *disk, struct block_device *bdev,
- sector_t offset);
-extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
-extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
-extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
-extern int blk_queue_dma_drain(struct request_queue *q,
- dma_drain_needed_fn *dma_drain_needed,
- void *buf, unsigned int size);
-extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
-extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
-extern void blk_queue_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);
-
-bool __must_check blk_get_queue(struct request_queue *);
-struct request_queue *blk_alloc_queue(gfp_t);
-struct request_queue *blk_alloc_queue_node(gfp_t, int);
-extern void blk_put_queue(struct request_queue *);
-
-/*
- * blk_plug permits building a queue of related requests by holding the I/O
- * fragments for a short period. This allows merging of sequential requests
- * into single larger request. As the requests are moved from a per-task list to
- * the device's request_queue in a batch, this results in improved scalability
- * as the lock contention for request_queue lock is reduced.
- *
- * It is ok not to disable preemption when adding the request to the plug list
- * or when attempting a merge, because blk_schedule_flush_list() will only flush
- * the plug list when the task sleeps by itself. For details, please see
- * schedule() where blk_schedule_flush_plug() is called.
- */
-struct blk_plug {
- unsigned long magic; /* detect uninitialized use-cases */
- struct list_head list; /* requests */
- struct list_head cb_list; /* md requires an unplug callback */
- unsigned int should_sort; /* list to be sorted before flushing? */
-};
-#define BLK_MAX_REQUEST_COUNT 16
-
-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
-
-#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 */
-
-struct bio;
-struct block_device;
-struct gendisk;
-struct blk_integrity;
-
-static inline int blk_integrity_rq(struct request *rq)
-{
- return 0;
-}
-static inline int blk_rq_count_integrity_sg(struct request_queue *q,
- struct bio *b)
-{
- return 0;
-}
-static inline int blk_rq_map_integrity_sg(struct request_queue *q,
- struct bio *b,
- struct scatterlist *s)
-{
- return 0;
-}
-static inline struct blk_integrity *bdev_get_integrity(struct block_device *b)
-{
- return 0;
-}
-static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
-{
- return NULL;
-}
-static inline int blk_integrity_compare(struct gendisk *a, struct gendisk *b)
-{
- return 0;
-}
-static inline int blk_integrity_register(struct gendisk *d,
- struct blk_integrity *b)
-{
- return 0;
-}
-static inline void blk_integrity_unregister(struct gendisk *d)
-{
-}
-static inline void blk_queue_max_integrity_segments(struct request_queue *q,
- unsigned int segs)
-{
-}
-static inline unsigned short queue_max_integrity_segments(struct request_queue *q)
-{
- return 0;
-}
-static inline int blk_integrity_merge_rq(struct request_queue *rq,
- struct request *r1,
- struct request *r2)
-{
- return 0;
-}
-static inline int blk_integrity_merge_bio(struct request_queue *rq,
- struct request *r,
- struct bio *b)
-{
- return 0;
-}
-static inline bool blk_integrity_is_initialized(struct gendisk *g)
-{
- return 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