struct request_queue;
struct elevator_queue;
-typedef struct elevator_queue elevator_t;
struct request_pm_state;
struct blk_trace;
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;
REQ_TYPE_ATA_PC,
};
+enum {
+ BLK_RW_ASYNC = 0,
+ BLK_RW_SYNC = 1,
+};
+
/*
* For request of type REQ_TYPE_LINUX_BLOCK, rq->cmd[0] is the opcode being
* sent down (similar to how REQ_TYPE_BLOCK_PC means that ->cmd[] holds a
__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_RW_SYNC, /* request is sync (sync write or read) */
__REQ_ALLOCED, /* request came from our alloc pool */
__REQ_RW_META, /* metadata io request */
__REQ_COPY_USER, /* contains copies of user pages */
__REQ_INTEGRITY, /* integrity metadata has been remapped */
+ __REQ_NOIDLE, /* Don't anticipate more IO after this one */
+ __REQ_IO_STAT, /* account I/O stat */
__REQ_NR_BITS, /* stops here */
};
#define REQ_RW_META (1 << __REQ_RW_META)
#define REQ_COPY_USER (1 << __REQ_COPY_USER)
#define REQ_INTEGRITY (1 << __REQ_INTEGRITY)
+#define REQ_NOIDLE (1 << __REQ_NOIDLE)
+#define REQ_IO_STAT (1 << __REQ_IO_STAT)
#define BLK_MAX_CDB 16
enum rq_cmd_type_bits cmd_type;
unsigned long atomic_flags;
- /* 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;
-
- /* no. of sectors left to complete in the current segment */
- unsigned int hard_cur_sectors;
+ /* the following two fields are internal, NEVER access directly */
+ sector_t __sector; /* sector cursor */
+ unsigned int __data_len; /* total data len */
struct bio *bio;
struct bio *biotail;
unsigned short ioprio;
- void *special;
- char *buffer;
+ void *special; /* opaque pointer available for LLD use */
+ char *buffer; /* kaddr of the current segment if available */
int tag;
int errors;
unsigned char __cmd[BLK_MAX_CDB];
unsigned char *cmd;
- unsigned int data_len;
unsigned int extra_len; /* length of alignment and padding */
unsigned int sense_len;
- void *data;
+ unsigned int resid_len; /* residual count */
void *sense;
unsigned long deadline;
struct kobject kobj;
};
+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 short logical_block_size;
+ unsigned short max_hw_segments;
+ unsigned short max_phys_segments;
+
+ unsigned char misaligned;
+ unsigned char no_cluster;
+};
+
struct request_queue
{
/*
*/
struct list_head queue_head;
struct request *last_merge;
- elevator_t *elevator;
+ struct elevator_queue *elevator;
/*
* the queue request freelist, one for reads and one for writes
/*
* queue needs bounce pages for pages above this limit
*/
- unsigned long bounce_pfn;
gfp_t bounce_gfp;
/*
unsigned int nr_congestion_off;
unsigned int nr_batching;
- unsigned int max_sectors;
- unsigned int max_hw_sectors;
- unsigned short max_phys_segments;
- unsigned short max_hw_segments;
- unsigned short hardsect_size;
- unsigned int max_segment_size;
-
- unsigned long seg_boundary_mask;
void *dma_drain_buffer;
unsigned int dma_drain_size;
unsigned int dma_pad_mask;
struct list_head tag_busy_list;
unsigned int nr_sorted;
- unsigned int in_flight;
+ unsigned int in_flight[2];
unsigned int rq_timeout;
struct timer_list timeout;
struct list_head timeout_list;
+ struct queue_limits limits;
+
/*
* sg stuff
*/
#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 /* read queue has been filled */
-#define QUEUE_FLAG_WRITEFULL 4 /* write queue has been filled */
+#define QUEUE_FLAG_SYNCFULL 3 /* read queue has been filled */
+#define QUEUE_FLAG_ASYNCFULL 4 /* write queue has been filled */
#define QUEUE_FLAG_DEAD 5 /* queue being torn down */
#define QUEUE_FLAG_REENTER 6 /* Re-entrancy avoidance */
#define QUEUE_FLAG_PLUGGED 7 /* queue is plugged */
#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
+#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */
+
+#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
+ (1 << QUEUE_FLAG_CLUSTER) | \
+ (1 << QUEUE_FLAG_STACKABLE))
static inline int queue_is_locked(struct request_queue *q)
{
__clear_bit(flag, &q->queue_flags);
}
+static inline int queue_in_flight(struct request_queue *q)
+{
+ return q->in_flight[0] + q->in_flight[1];
+}
+
static inline void queue_flag_clear(unsigned int flag, struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
+#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_flushing(q) ((q)->ordseq)
#define blk_queue_stackable(q) \
test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
blk_failfast_transport(rq) || \
blk_failfast_driver(rq))
#define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED)
+#define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT)
+#define blk_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET)
#define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq)))
#define rq_data_dir(rq) ((rq)->cmd_flags & 1)
/*
- * We regard a request as sync, if it's a READ or a SYNC write.
+ * We regard a request as sync, if either a read or a sync write
*/
-#define rq_is_sync(rq) (rq_data_dir((rq)) == READ || (rq)->cmd_flags & REQ_RW_SYNC)
+static inline bool rw_is_sync(unsigned int rw_flags)
+{
+ return !(rw_flags & REQ_RW) || (rw_flags & REQ_RW_SYNC);
+}
+
+static inline bool rq_is_sync(struct request *rq)
+{
+ return rw_is_sync(rq->cmd_flags);
+}
+
#define rq_is_meta(rq) ((rq)->cmd_flags & REQ_RW_META)
+#define rq_noidle(rq) ((rq)->cmd_flags & REQ_NOIDLE)
-static inline int blk_queue_full(struct request_queue *q, int rw)
+static inline int blk_queue_full(struct request_queue *q, int sync)
{
- if (rw == READ)
- return test_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
- return test_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
+ 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 rw)
+static inline void blk_set_queue_full(struct request_queue *q, int sync)
{
- if (rw == READ)
- queue_flag_set(QUEUE_FLAG_READFULL, q);
+ if (sync)
+ queue_flag_set(QUEUE_FLAG_SYNCFULL, q);
else
- queue_flag_set(QUEUE_FLAG_WRITEFULL, q);
+ queue_flag_set(QUEUE_FLAG_ASYNCFULL, q);
}
-static inline void blk_clear_queue_full(struct request_queue *q, int rw)
+static inline void blk_clear_queue_full(struct request_queue *q, int sync)
{
- if (rw == READ)
- queue_flag_clear(QUEUE_FLAG_READFULL, q);
+ if (sync)
+ queue_flag_clear(QUEUE_FLAG_SYNCFULL, q);
else
- queue_flag_clear(QUEUE_FLAG_WRITEFULL, q);
+ queue_flag_clear(QUEUE_FLAG_ASYNCFULL, q);
}
struct page **pages;
int page_order;
int nr_entries;
+ unsigned long offset;
+ int null_mapped;
};
struct req_iterator {
};
/* 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)
extern void blk_put_request(struct request *);
extern void __blk_put_request(struct request_queue *, struct request *);
extern struct request *blk_get_request(struct request_queue *, int, gfp_t);
+extern struct request *blk_make_request(struct request_queue *, struct bio *,
+ gfp_t);
extern void blk_insert_request(struct request_queue *, struct request *, int, void *);
extern void blk_requeue_request(struct request_queue *, struct request *);
extern int blk_rq_check_limits(struct request_queue *q, struct request *rq);
extern int blk_lld_busy(struct request_queue *q);
+extern int blk_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_plug_device(struct request_queue *);
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.
extern void __blk_stop_queue(struct request_queue *q);
extern void __blk_run_queue(struct request_queue *);
extern void blk_run_queue(struct request_queue *);
-extern void blk_start_queueing(struct request_queue *);
extern int blk_rq_map_user(struct request_queue *, struct request *,
struct rq_map_data *, void __user *, unsigned long,
gfp_t);
blk_run_backing_dev(mapping->backing_dev_info, NULL);
}
-extern void blkdev_dequeue_request(struct request *req);
+/*
+ * blk_rq_pos() : the current sector
+ * blk_rq_bytes() : bytes left in the entire request
+ * blk_rq_cur_bytes() : bytes left in the current segment
+ * blk_rq_sectors() : sectors left in the entire request
+ * blk_rq_cur_sectors() : sectors left in the current segment
+ */
+static inline sector_t blk_rq_pos(const struct request *rq)
+{
+ return rq->__sector;
+}
+
+static inline unsigned int blk_rq_bytes(const struct request *rq)
+{
+ return rq->__data_len;
+}
+
+static inline int blk_rq_cur_bytes(const struct request *rq)
+{
+ return rq->bio ? bio_cur_bytes(rq->bio) : 0;
+}
+
+static inline unsigned int blk_rq_sectors(const struct request *rq)
+{
+ return blk_rq_bytes(rq) >> 9;
+}
+
+static inline unsigned int blk_rq_cur_sectors(const struct request *rq)
+{
+ return blk_rq_cur_bytes(rq) >> 9;
+}
+
+/*
+ * Request issue related functions.
+ */
+extern struct request *blk_peek_request(struct request_queue *q);
+extern void blk_start_request(struct request *rq);
+extern struct request *blk_fetch_request(struct request_queue *q);
/*
- * blk_end_request() and friends.
- * __blk_end_request() and end_request() must be called with
- * the request queue spinlock acquired.
+ * 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 int blk_end_request(struct request *rq, int error,
- unsigned int nr_bytes);
-extern int __blk_end_request(struct request *rq, int error,
- unsigned int nr_bytes);
-extern int blk_end_bidi_request(struct request *rq, int error,
- unsigned int nr_bytes, unsigned int bidi_bytes);
-extern void end_request(struct request *, int);
-extern int blk_end_request_callback(struct request *rq, int error,
- unsigned int nr_bytes,
- int (drv_callback)(struct request *));
+extern bool blk_update_request(struct request *rq, int error,
+ unsigned int nr_bytes);
+extern bool blk_end_request(struct request *rq, int error,
+ unsigned int nr_bytes);
+extern void blk_end_request_all(struct request *rq, int error);
+extern bool blk_end_request_cur(struct request *rq, int error);
+extern bool __blk_end_request(struct request *rq, int error,
+ unsigned int nr_bytes);
+extern void __blk_end_request_all(struct request *rq, int error);
+extern bool __blk_end_request_cur(struct request *rq, int error);
+
extern void blk_complete_request(struct request *);
extern void __blk_complete_request(struct request *);
extern void blk_abort_request(struct request *);
extern void blk_abort_queue(struct request_queue *);
-extern void blk_update_request(struct request *rq, int error,
- unsigned int nr_bytes);
-
-/*
- * blk_end_request() takes bytes instead of sectors as a complete size.
- * blk_rq_bytes() returns bytes left to complete in the entire request.
- * blk_rq_cur_bytes() returns bytes left to complete in the current segment.
- */
-extern unsigned int blk_rq_bytes(struct request *rq);
-extern unsigned int blk_rq_cur_bytes(struct request *rq);
/*
* Access functions for manipulating queue properties
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_hw_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_logical_block_size(struct request_queue *, unsigned short);
+extern void blk_queue_physical_block_size(struct request_queue *, unsigned short);
+extern void blk_queue_alignment_offset(struct request_queue *q,
+ unsigned int alignment);
+extern void blk_queue_io_min(struct request_queue *q, unsigned int min);
+extern void blk_queue_io_opt(struct request_queue *q, unsigned int opt);
+extern void blk_set_default_limits(struct queue_limits *lim);
+extern int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
+ sector_t offset);
+extern 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);
#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
-static inline int queue_hardsect_size(struct request_queue *q)
+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_hw_segments(struct request_queue *q)
+{
+ return q->limits.max_hw_segments;
+}
+
+static inline unsigned short queue_max_phys_segments(struct request_queue *q)
+{
+ return q->limits.max_phys_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->hardsect_size)
- retval = q->hardsect_size;
+ if (q && q->limits.logical_block_size)
+ retval = q->limits.logical_block_size;
return retval;
}
-static inline int bdev_hardsect_size(struct block_device *bdev)
+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 queue_io_min(struct request_queue *q)
+{
+ return q->limits.io_min;
+}
+
+static inline unsigned int queue_io_opt(struct request_queue *q)
+{
+ return q->limits.io_opt;
+}
+
+static inline int queue_alignment_offset(struct request_queue *q)
+{
+ if (q && q->limits.misaligned)
+ return -1;
+
+ if (q && q->limits.alignment_offset)
+ return q->limits.alignment_offset;
+
+ return 0;
+}
+
+static inline int queue_sector_alignment_offset(struct request_queue *q,
+ sector_t sector)
{
- return queue_hardsect_size(bdev_get_queue(bdev));
+ return ((sector << 9) - q->limits.alignment_offset)
+ & (q->limits.io_min - 1);
}
static inline int queue_dma_alignment(struct request_queue *q)
int (*direct_access) (struct block_device *, sector_t,
void **, unsigned long *);
int (*media_changed) (struct gendisk *);
+ unsigned long long (*set_capacity) (struct gendisk *,
+ unsigned long long);
int (*revalidate_disk) (struct gendisk *);
int (*getgeo)(struct block_device *, struct hd_geometry *);
struct module *owner;
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff