#ifndef _LINUX_BLKDEV_H
#define _LINUX_BLKDEV_H
-#include <linux/config.h>
+#include <linux/sched.h>
#include <linux/major.h>
#include <linux/genhd.h>
#include <linux/list.h>
#include <linux/bio.h>
#include <linux/module.h>
#include <linux/stringify.h>
+#include <linux/bsg.h>
#include <asm/scatterlist.h>
+#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
+
+#ifdef CONFIG_BLOCK
+
+struct scsi_ioctl_command;
+
struct request_queue;
-typedef struct request_queue request_queue_t;
+typedef struct request_queue request_queue_t __deprecated;
struct elevator_queue;
typedef struct elevator_queue elevator_t;
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 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;
+ struct rb_node rb_node;
void *key;
+ struct cfq_queue *cfqq[2];
+
struct io_context *ioc;
unsigned long last_end_request;
- unsigned long last_queue;
+ sector_t last_request_pos;
+
unsigned long ttime_total;
unsigned long ttime_samples;
unsigned long ttime_mean;
- void (*dtor)(struct cfq_io_context *);
- void (*exit)(struct cfq_io_context *);
+ unsigned int seek_samples;
+ u64 seek_total;
+ sector_t seek_mean;
+
+ struct list_head queue_list;
+
+ void (*dtor)(struct io_context *); /* destructor */
+ void (*exit)(struct io_context *); /* called on task exit */
};
/*
atomic_t refcount;
struct task_struct *task;
- int (*set_ioprio)(struct io_context *, unsigned int);
+ unsigned int ioprio_changed;
/*
* For request batching
int nr_batch_requests; /* Number of requests left in the batch */
struct as_io_context *aic;
- struct cfq_io_context *cic;
+ struct rb_root cic_root;
+ void *ioc_data;
};
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);
+struct io_context *get_io_context(gfp_t gfp_flags, int node);
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 *);
+typedef void (rq_end_io_fn)(struct request *, int);
struct request_list {
int count[2];
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_FLUSH, /* flush 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_CMD,
+ REQ_TYPE_ATA_TASK,
+ REQ_TYPE_ATA_TASKFILE,
+ REQ_TYPE_ATA_PC,
+};
+
+/*
+ * 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 {
+ /*
+ * just examples for now
+ */
+ REQ_LB_OP_EJECT = 0x40, /* eject request */
+ REQ_LB_OP_FLUSH = 0x41, /* flush device */
+};
+
+/*
+ * request type modified bits. 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_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 (O_DIRECT) */
+ __REQ_ALLOCED, /* request came from our alloc pool */
+ __REQ_RW_META, /* metadata io request */
+ __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_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 BLK_MAX_CDB 16
/*
* try to put the fields that are referenced together in the same cacheline
*/
struct request {
- struct list_head queuelist; /* looking for ->queue? you must _not_
- * access it directly, use
- * blkdev_dequeue_request! */
- unsigned long flags; /* see REQ_ bits below */
+ struct list_head queuelist;
+ struct list_head donelist;
+
+ struct request_queue *q;
+
+ unsigned int cmd_flags;
+ enum rq_cmd_type_bits cmd_type;
/* 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 */
+ sector_t hard_sector; /* next sector to complete */
unsigned long nr_sectors; /* no. of sectors left to submit */
+ unsigned long hard_nr_sectors; /* no. of sectors left to complete */
/* 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;
+ 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;
+ };
- unsigned short ioprio;
+ /*
+ * two pointers are available for the IO schedulers, if they need
+ * more they have to dynamically allocate it.
+ */
+ void *elevator_private;
+ void *elevator_private2;
- 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
*/
unsigned short nr_hw_segments;
- int tag;
+ unsigned short ioprio;
+
+ void *special;
char *buffer;
- int ref_count;
- request_queue_t *q;
- struct request_list *rl;
+ int tag;
+ int errors;
- struct completion *waiting;
- void *special;
+ int ref_count;
/*
* when request is used as a packet command carrier
unsigned char cmd[BLK_MAX_CDB];
unsigned int data_len;
- void *data;
-
unsigned int sense_len;
+ void *data;
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
+ * completion callback.
*/
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_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_BAR_PREFLUSH, /* barrier pre-flush done */
- __REQ_BAR_POSTFLUSH, /* barrier post-flush */
- __REQ_BAR_FLUSH, /* rq is the flush request */
- __REQ_NR_BITS, /* stops here */
+ /* for bidi */
+ struct request *next_rq;
};
-#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_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_BAR_PREFLUSH (1 << __REQ_BAR_PREFLUSH)
-#define REQ_BAR_POSTFLUSH (1 << __REQ_BAR_POSTFLUSH)
-#define REQ_BAR_FLUSH (1 << __REQ_BAR_FLUSH)
-
/*
- * State information carried for REQ_PM_SUSPEND and REQ_PM_RESUME
+ * 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
#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 *);
+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 *);
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 int (prepare_flush_fn) (request_queue_t *, struct request *);
-typedef void (end_flush_fn) (request_queue_t *, struct request *);
+typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
+typedef int (issue_flush_fn) (struct request_queue *, struct gendisk *, sector_t *);
+typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
+typedef void (softirq_done_fn)(struct request *);
enum blk_queue_state {
Queue_down,
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;
- end_flush_fn *end_flush_fn;
+ softirq_done_fn *softirq_done_fn;
/*
* Dispatch queue sorting
*/
void *queuedata;
- void *activity_data;
-
/*
* queue needs bounce pages for pages above this limit
*/
unsigned int nr_congestion_off;
unsigned int nr_batching;
- unsigned short max_sectors;
- unsigned short max_hw_sectors;
+ unsigned int max_sectors;
+ unsigned int max_hw_sectors;
unsigned short max_phys_segments;
unsigned short max_hw_segments;
unsigned short hardsect_size;
struct blk_queue_tag *queue_tags;
- atomic_t refcnt;
-
unsigned int nr_sorted;
unsigned int in_flight;
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
*/
- struct request *flush_rq;
- unsigned char ordered;
-};
+ 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;
-enum {
- QUEUE_ORDERED_NONE,
- QUEUE_ORDERED_TAG,
- QUEUE_ORDERED_FLUSH,
-};
+ struct mutex sysfs_lock;
-#define RQ_INACTIVE (-1)
-#define RQ_ACTIVE 1
-#define RQ_SCSI_BUSY 0xffff
-#define RQ_SCSI_DONE 0xfffe
-#define RQ_SCSI_DISCONNECTING 0xffe0
+#if defined(CONFIG_BLK_DEV_BSG)
+ struct bsg_class_device bsg_dev;
+#endif
+};
#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_READFULL 3 /* read queue has been filled */
+#define QUEUE_FLAG_WRITEFULL 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_FLUSH 9 /* doing barrier flush sequence */
+#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
+
+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) test_bit(QUEUE_FLAG_FLUSH, &(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_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_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
+#define blk_rq_started(rq) ((rq)->cmd_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_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) \
- ((rq)->flags & (REQ_PM_SUSPEND | REQ_PM_RESUME))
+ (blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
-#define blk_sorted_rq(rq) ((rq)->flags & REQ_SORTED)
-#define blk_barrier_rq(rq) ((rq)->flags & REQ_HARDBARRIER)
-#define blk_barrier_preflush(rq) ((rq)->flags & REQ_BAR_PREFLUSH)
-#define blk_barrier_postflush(rq) ((rq)->flags & REQ_BAR_POSTFLUSH)
+#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_bidi_rq(rq) ((rq)->next_rq != NULL)
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
-#define rq_data_dir(rq) ((rq)->flags & 1)
+#define rq_data_dir(rq) ((rq)->cmd_flags & 1)
+
+/*
+ * We regard a request as sync, if it's a READ or a SYNC write.
+ */
+#define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC)
+#define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META)
static inline int blk_queue_full(struct request_queue *q, int rw)
{
#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)
+ (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq)))
/*
* q->prep_rq_fn return values
#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
-#ifdef CONFIG_MMU
+/*
+ * default timeout for SG_IO if none specified
+ */
+#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
+
+#ifdef CONFIG_BOUNCE
extern int init_emergency_isa_pool(void);
-extern void blk_queue_bounce(request_queue_t *q, struct bio **bio);
+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(request_queue_t *q, struct bio **bio)
+static inline void blk_queue_bounce(struct request_queue *q, struct bio **bio)
{
}
#endif /* CONFIG_MMU */
-#define rq_for_each_bio(_bio, rq) \
+struct req_iterator {
+ int i;
+ struct bio *bio;
+};
+
+/* This should not be used directly - use rq_for_each_segment */
+#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;
-};
+#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_put_request(struct request *);
-extern void __blk_put_request(request_queue_t *, struct request *);
-extern void blk_end_sync_rq(struct request *rq);
-extern void blk_attempt_remerge(request_queue_t *, struct request *);
-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_put_request(struct request_queue *, struct request *);
+extern void blk_end_sync_rq(struct request *rq, int error);
+extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
+extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
+extern void blk_requeue_request(struct request_queue *, struct request *);
+extern void blk_plug_device(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 file *, struct request_queue *,
+ struct gendisk *, unsigned int, void __user *);
+extern int sg_scsi_ioctl(struct file *, struct request_queue *,
+ struct gendisk *, struct scsi_ioctl_command __user *);
+
+/*
+ * Temporary export, until SCSI gets fixed up.
+ */
+extern int blk_rq_append_bio(struct request_queue *q, struct request *rq,
+ 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 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(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 *,
+extern void __blk_stop_queue(struct request_queue *q);
+extern void blk_run_queue(struct request_queue *);
+extern void blk_start_queueing(struct request_queue *);
+extern int blk_rq_map_user(struct request_queue *, struct request *, void __user *, unsigned long);
+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 sg_iovec *, int, unsigned int);
+extern int blk_execute_rq(struct request_queue *, struct gendisk *,
struct request *, int);
-extern void blk_execute_rq_nowait(request_queue_t *, struct gendisk *,
- struct request *, int,
- void (*done)(struct request *));
+extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
+ struct request *, int, rq_end_io_fn *);
+extern int blk_verify_command(unsigned char *, int);
-static inline request_queue_t *bdev_get_queue(struct block_device *bdev)
+static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
{
return bdev->bd_disk->queue;
}
*/
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 *);
+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 *);
/*
* end_that_request_first/chunk() takes an uptodate argument. we account
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,
+extern struct request_queue *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 short);
-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 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_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_softirq_done(struct request_queue *, softirq_done_fn *);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
-extern void blk_queue_ordered(request_queue_t *, int);
-extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *);
-extern struct request *blk_start_pre_flush(request_queue_t *,struct request *);
-extern int blk_complete_barrier_rq(request_queue_t *, struct request *, int);
-extern int blk_complete_barrier_rq_locked(request_queue_t *, struct request *, int);
-
-extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *);
+extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
+extern void blk_queue_issue_flush_fn(struct request_queue *, issue_flush_fn *);
+extern int 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 void 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(request_queue_t *);
-extern void __generic_unplug_device(request_queue_t *);
+extern void generic_unplug_device(struct request_queue *);
+extern void __generic_unplug_device(struct request_queue *);
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))
+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_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 *);
+#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 *);
#define MAX_PHYS_SEGMENTS 128
#define MAX_HW_SEGMENTS 128
-#define MAX_SECTORS 255
+#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)
+static inline int queue_hardsect_size(struct request_queue *q)
{
int retval = 512;
return queue_hardsect_size(bdev_get_queue(bdev));
}
-static inline int queue_dma_alignment(request_queue_t *q)
+static inline int queue_dma_alignment(struct request_queue *q)
{
int retval = 511;
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)
{
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
+void kblockd_flush_work(struct work_struct *work);
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
MODULE_ALIAS("block-major-" __stringify(major) "-*")
+#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;
+}
+
+static inline void exit_io_context(void)
+{
+}
+
+#endif /* CONFIG_BLOCK */
+
#endif
Code Review / linux-3.10.git / blobdiff