#include <linux/bio.h>
#include <linux/module.h>
#include <linux/stringify.h>
+#include <linux/gfp.h>
#include <linux/bsg.h>
+#include <linux/smp.h>
#include <asm/scatterlist.h>
struct 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_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 */
/*
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
*
*/
enum {
- /*
- * just examples for now
- */
REQ_LB_OP_EJECT = 0x40, /* eject request */
- REQ_LB_OP_FLUSH = 0x41, /* flush device */
+ REQ_LB_OP_FLUSH = 0x41, /* flush request */
+ REQ_LB_OP_DISCARD = 0x42, /* discard sectors */
};
/*
- * request type modified bits. first three bits match BIO_RW* bits, important
+ * request type modified bits. first two bits match BIO_RW* bits, important
*/
enum rq_flag_bits {
__REQ_RW, /* not set, read. set, write */
- __REQ_FAILFAST, /* no low level driver retries */
+ __REQ_FAILFAST_DEV, /* no driver retries of device errors */
+ __REQ_FAILFAST_TRANSPORT, /* no driver retries of transport errors */
+ __REQ_FAILFAST_DRIVER, /* no driver retries of driver errors */
+ __REQ_DISCARD, /* request to discard sectors */
__REQ_SORTED, /* elevator knows about this request */
__REQ_SOFTBARRIER, /* may not be passed by ioscheduler */
__REQ_HARDBARRIER, /* may not be passed by drive either */
__REQ_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 (1 << __REQ_RW)
-#define REQ_FAILFAST (1 << __REQ_FAILFAST)
+#define REQ_FAILFAST_DEV (1 << __REQ_FAILFAST_DEV)
+#define REQ_FAILFAST_TRANSPORT (1 << __REQ_FAILFAST_TRANSPORT)
+#define REQ_FAILFAST_DRIVER (1 << __REQ_FAILFAST_DRIVER)
+#define REQ_DISCARD (1 << __REQ_DISCARD)
#define REQ_SORTED (1 << __REQ_SORTED)
#define REQ_SOFTBARRIER (1 << __REQ_SOFTBARRIER)
#define REQ_HARDBARRIER (1 << __REQ_HARDBARRIER)
#define REQ_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
*/
struct request {
struct list_head queuelist;
- struct list_head donelist;
+ struct call_single_data csd;
+ int cpu;
struct request_queue *q;
unsigned int cmd_flags;
enum rq_cmd_type_bits cmd_type;
+ unsigned long atomic_flags;
- /* 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 nr_phys_segments;
- /* Number of scatter-gather addr+len pairs after
- * physical and DMA remapping hardware coalescing is performed.
- * This is the number of scatter-gather entries the driver
- * will actually have to deal with after DMA mapping is done.
- */
- unsigned short nr_hw_segments;
-
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 list_head timeout_list;
unsigned int timeout;
int retries;
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.
typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unplug_fn) (struct request_queue *);
+typedef int (prepare_discard_fn) (struct request_queue *, struct request *);
struct bio_vec;
-typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
+struct bvec_merge_data {
+ struct block_device *bi_bdev;
+ sector_t bi_sector;
+ unsigned bi_size;
+ unsigned long bi_rw;
+};
+typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
+ struct bio_vec *);
typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
+typedef int (lld_busy_fn) (struct request_queue *q);
+
+enum blk_eh_timer_return {
+ BLK_EH_NOT_HANDLED,
+ BLK_EH_HANDLED,
+ BLK_EH_RESET_TIMER,
+};
+
+typedef enum blk_eh_timer_return (rq_timed_out_fn)(struct request *);
enum blk_queue_state {
Queue_down,
atomic_t refcnt; /* map can be shared */
};
+#define BLK_SCSI_MAX_CMDS (256)
+#define BLK_SCSI_CMD_PER_LONG (BLK_SCSI_MAX_CMDS / (sizeof(long) * 8))
+
+struct blk_cmd_filter {
+ unsigned long read_ok[BLK_SCSI_CMD_PER_LONG];
+ unsigned long write_ok[BLK_SCSI_CMD_PER_LONG];
+ struct kobject kobj;
+};
+
struct request_queue
{
/*
*/
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
make_request_fn *make_request_fn;
prep_rq_fn *prep_rq_fn;
unplug_fn *unplug_fn;
+ prepare_discard_fn *prepare_discard_fn;
merge_bvec_fn *merge_bvec_fn;
prepare_flush_fn *prepare_flush_fn;
softirq_done_fn *softirq_done_fn;
+ rq_timed_out_fn *rq_timed_out_fn;
dma_drain_needed_fn *dma_drain_needed;
+ lld_busy_fn *lld_busy_fn;
/*
* Dispatch queue sorting
unsigned int nr_sorted;
unsigned int in_flight;
+ unsigned int rq_timeout;
+ struct timer_list timeout;
+ struct list_head timeout_list;
+
/*
* sg stuff
*/
#if defined(CONFIG_BLK_DEV_BSG)
struct bsg_class_device bsg_dev;
#endif
+ struct blk_cmd_filter cmd_filter;
};
#define QUEUE_FLAG_CLUSTER 0 /* cluster several segments into 1 */
#define QUEUE_FLAG_QUEUED 1 /* uses generic tag queueing */
#define QUEUE_FLAG_STOPPED 2 /* queue is stopped */
-#define QUEUE_FLAG_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_ELVSWITCH 8 /* don't use elevator, just do FIFO */
#define QUEUE_FLAG_BIDI 9 /* queue supports bidi requests */
#define QUEUE_FLAG_NOMERGES 10 /* disable merge attempts */
+#define QUEUE_FLAG_SAME_COMP 11 /* force complete on same CPU */
+#define QUEUE_FLAG_FAIL_IO 12 /* fake timeout */
+#define QUEUE_FLAG_STACKABLE 13 /* supports request stacking */
+#define QUEUE_FLAG_NONROT 14 /* non-rotational device (SSD) */
+#define QUEUE_FLAG_VIRT QUEUE_FLAG_NONROT /* paravirt device */
+#define QUEUE_FLAG_IO_STAT 15 /* do IO stats */
+
+#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
+ (1 << QUEUE_FLAG_CLUSTER) | \
+ (1 << QUEUE_FLAG_STACKABLE))
static inline int queue_is_locked(struct request_queue *q)
{
__set_bit(flag, &q->queue_flags);
}
+static inline int queue_flag_test_and_clear(unsigned int flag,
+ struct request_queue *q)
+{
+ WARN_ON_ONCE(!queue_is_locked(q));
+
+ if (test_bit(flag, &q->queue_flags)) {
+ __clear_bit(flag, &q->queue_flags);
+ return 1;
+ }
+
+ return 0;
+}
+
+static inline int queue_flag_test_and_set(unsigned int flag,
+ struct request_queue *q)
+{
+ WARN_ON_ONCE(!queue_is_locked(q));
+
+ if (!test_bit(flag, &q->queue_flags)) {
+ __set_bit(flag, &q->queue_flags);
+ return 0;
+ }
+
+ return 1;
+}
+
static inline void queue_flag_set(unsigned int flag, struct request_queue *q)
{
WARN_ON_ONCE(!queue_is_locked(q));
* 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,
+ QUEUE_ORDERED_BY_DRAIN = 0x01,
+ QUEUE_ORDERED_BY_TAG = 0x02,
+ QUEUE_ORDERED_DO_PREFLUSH = 0x10,
+ QUEUE_ORDERED_DO_BAR = 0x20,
+ QUEUE_ORDERED_DO_POSTFLUSH = 0x40,
+ QUEUE_ORDERED_DO_FUA = 0x80,
+
+ QUEUE_ORDERED_NONE = 0x00,
+
+ QUEUE_ORDERED_DRAIN = QUEUE_ORDERED_BY_DRAIN |
+ QUEUE_ORDERED_DO_BAR,
+ QUEUE_ORDERED_DRAIN_FLUSH = QUEUE_ORDERED_DRAIN |
+ QUEUE_ORDERED_DO_PREFLUSH |
+ QUEUE_ORDERED_DO_POSTFLUSH,
+ QUEUE_ORDERED_DRAIN_FUA = QUEUE_ORDERED_DRAIN |
+ QUEUE_ORDERED_DO_PREFLUSH |
+ QUEUE_ORDERED_DO_FUA,
+
+ QUEUE_ORDERED_TAG = QUEUE_ORDERED_BY_TAG |
+ QUEUE_ORDERED_DO_BAR,
+ QUEUE_ORDERED_TAG_FLUSH = QUEUE_ORDERED_TAG |
+ QUEUE_ORDERED_DO_PREFLUSH |
+ QUEUE_ORDERED_DO_POSTFLUSH,
+ QUEUE_ORDERED_TAG_FUA = QUEUE_ORDERED_TAG |
+ QUEUE_ORDERED_DO_PREFLUSH |
+ QUEUE_ORDERED_DO_FUA,
/*
* Ordered operation sequence
#define blk_queue_tagged(q) test_bit(QUEUE_FLAG_QUEUED, &(q)->queue_flags)
#define blk_queue_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags)
#define blk_queue_nomerges(q) test_bit(QUEUE_FLAG_NOMERGES, &(q)->queue_flags)
+#define blk_queue_nonrot(q) test_bit(QUEUE_FLAG_NONROT, &(q)->queue_flags)
+#define blk_queue_io_stat(q) test_bit(QUEUE_FLAG_IO_STAT, &(q)->queue_flags)
#define blk_queue_flushing(q) ((q)->ordseq)
+#define blk_queue_stackable(q) \
+ test_bit(QUEUE_FLAG_STACKABLE, &(q)->queue_flags)
#define blk_fs_request(rq) ((rq)->cmd_type == REQ_TYPE_FS)
#define blk_pc_request(rq) ((rq)->cmd_type == REQ_TYPE_BLOCK_PC)
#define blk_special_request(rq) ((rq)->cmd_type == REQ_TYPE_SPECIAL)
#define blk_sense_request(rq) ((rq)->cmd_type == REQ_TYPE_SENSE)
-#define blk_noretry_request(rq) ((rq)->cmd_flags & REQ_FAILFAST)
+#define blk_failfast_dev(rq) ((rq)->cmd_flags & REQ_FAILFAST_DEV)
+#define blk_failfast_transport(rq) ((rq)->cmd_flags & REQ_FAILFAST_TRANSPORT)
+#define blk_failfast_driver(rq) ((rq)->cmd_flags & REQ_FAILFAST_DRIVER)
+#define blk_noretry_request(rq) (blk_failfast_dev(rq) || \
+ blk_failfast_transport(rq) || \
+ blk_failfast_driver(rq))
#define blk_rq_started(rq) ((rq)->cmd_flags & REQ_STARTED)
+#define blk_rq_io_stat(rq) ((rq)->cmd_flags & REQ_IO_STAT)
-#define blk_account_rq(rq) (blk_rq_started(rq) && blk_fs_request(rq))
+#define blk_account_rq(rq) (blk_rq_started(rq) && (blk_fs_request(rq) || blk_discard_rq(rq)))
#define blk_pm_suspend_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_SUSPEND)
#define blk_pm_resume_request(rq) ((rq)->cmd_type == REQ_TYPE_PM_RESUME)
#define blk_pm_request(rq) \
(blk_pm_suspend_request(rq) || blk_pm_resume_request(rq))
+#define blk_rq_cpu_valid(rq) ((rq)->cpu != -1)
#define blk_sorted_rq(rq) ((rq)->cmd_flags & REQ_SORTED)
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
+#define blk_discard_rq(rq) ((rq)->cmd_flags & REQ_DISCARD)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
-#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
/* rq->queuelist of dequeued request must be list_empty() */
#define blk_queued_rq(rq) (!list_empty(&(rq)->queuelist))
#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);
}
#define RQ_NOMERGE_FLAGS \
(REQ_NOMERGE | REQ_STARTED | REQ_HARDBARRIER | REQ_SOFTBARRIER)
#define rq_mergeable(rq) \
- (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && blk_fs_request((rq)))
+ (!((rq)->cmd_flags & RQ_NOMERGE_FLAGS) && \
+ (blk_discard_rq(rq) || blk_fs_request((rq))))
/*
* q->prep_rq_fn return values
* 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);
}
#endif /* CONFIG_MMU */
+struct rq_map_data {
+ struct page **pages;
+ int page_order;
+ int nr_entries;
+ unsigned long offset;
+ int null_mapped;
+};
+
struct req_iterator {
int i;
struct bio *bio;
};
/* This should not be used directly - use rq_for_each_segment */
+#define for_each_bio(_bio) \
+ for (; _bio; _bio = _bio->bi_next)
#define __rq_for_each_bio(_bio, rq) \
if ((rq->bio)) \
for (_bio = (rq)->bio; _bio; _bio = _bio->bi_next)
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 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 int blk_rq_check_limits(struct request_queue *q, struct request *rq);
+extern int blk_lld_busy(struct request_queue *q);
+extern int blk_insert_cloned_request(struct request_queue *q,
+ struct request *rq);
extern void blk_plug_device(struct request_queue *);
+extern void blk_plug_device_unlocked(struct request_queue *);
extern int blk_remove_plug(struct request_queue *);
extern void blk_recount_segments(struct request_queue *, struct bio *);
-extern int scsi_cmd_ioctl(struct 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 *);
+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 *);
/*
* Temporary export, until SCSI gets fixed up.
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 *, void __user *, unsigned long);
+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 sg_iovec *, int, unsigned int);
+ struct rq_map_data *, struct sg_iovec *, int,
+ unsigned int, gfp_t);
extern int blk_execute_rq(struct request_queue *, struct gendisk *,
struct request *, int);
extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
struct request *, int, rq_end_io_fn *);
-extern int blk_verify_command(unsigned char *, int);
extern void blk_unplug(struct request_queue *q);
static inline struct request_queue *bdev_get_queue(struct block_device *bdev)
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;
+}
+
/*
- * 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 void end_queued_request(struct request *, int);
-extern void end_dequeued_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 void blk_complete_request(struct request *);
+extern bool blk_update_request(struct request *rq, int error,
+ unsigned int nr_bytes);
+extern bool blk_end_bidi_request(struct request *rq, int error,
+ unsigned int nr_bytes,
+ unsigned int bidi_bytes);
+extern bool __blk_end_bidi_request(struct request *rq, int error,
+ unsigned int nr_bytes,
+ unsigned int bidi_bytes);
+
+/**
+ * blk_end_request - Helper function for drivers to complete the request.
+ * @rq: the request being processed
+ * @error: %0 for success, < %0 for error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ * Ends I/O on a number of bytes attached to @rq.
+ * If @rq has leftover, sets it up for the next range of segments.
+ *
+ * Return:
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
+ **/
+static inline bool blk_end_request(struct request *rq, int error,
+ unsigned int nr_bytes)
+{
+ return blk_end_bidi_request(rq, error, nr_bytes, 0);
+}
-/*
- * 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.
+/**
+ * blk_end_request_all - Helper function for drives to finish the request.
+ * @rq: the request to finish
+ * @err: %0 for success, < %0 for error
+ *
+ * Description:
+ * Completely finish @rq.
*/
-extern unsigned int blk_rq_bytes(struct request *rq);
-extern unsigned int blk_rq_cur_bytes(struct request *rq);
+static inline void blk_end_request_all(struct request *rq, int error)
+{
+ bool pending;
+
+ pending = blk_end_request(rq, error, blk_rq_bytes(rq));
+ BUG_ON(pending);
+}
-static inline void blkdev_dequeue_request(struct request *req)
+/**
+ * blk_end_request_cur - Helper function to finish the current request chunk.
+ * @rq: the request to finish the current chunk for
+ * @err: %0 for success, < %0 for error
+ *
+ * Description:
+ * Complete the current consecutively mapped chunk from @rq.
+ *
+ * Return:
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
+ */
+static inline bool blk_end_request_cur(struct request *rq, int error)
+{
+ return blk_end_request(rq, error, blk_rq_cur_bytes(rq));
+}
+
+/**
+ * __blk_end_request - Helper function for drivers to complete the request.
+ * @rq: the request being processed
+ * @error: %0 for success, < %0 for error
+ * @nr_bytes: number of bytes to complete
+ *
+ * Description:
+ * Must be called with queue lock held unlike blk_end_request().
+ *
+ * Return:
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
+ **/
+static inline bool __blk_end_request(struct request *rq, int error,
+ unsigned int nr_bytes)
+{
+ return __blk_end_bidi_request(rq, error, nr_bytes, 0);
+}
+
+/**
+ * __blk_end_request_all - Helper function for drives to finish the request.
+ * @rq: the request to finish
+ * @err: %0 for success, < %0 for error
+ *
+ * Description:
+ * Completely finish @rq. Must be called with queue lock held.
+ */
+static inline void __blk_end_request_all(struct request *rq, int error)
+{
+ bool pending;
+
+ pending = __blk_end_request(rq, error, blk_rq_bytes(rq));
+ BUG_ON(pending);
+}
+
+/**
+ * __blk_end_request_cur - Helper function to finish the current request chunk.
+ * @rq: the request to finish the current chunk for
+ * @err: %0 for success, < %0 for error
+ *
+ * Description:
+ * Complete the current consecutively mapped chunk from @rq. Must
+ * be called with queue lock held.
+ *
+ * Return:
+ * %false - we are done with this request
+ * %true - still buffers pending for this request
+ */
+static inline bool __blk_end_request_cur(struct request *rq, int error)
{
- elv_dequeue_request(req->q, req);
+ return __blk_end_request(rq, error, blk_rq_cur_bytes(rq));
}
+extern void blk_complete_request(struct request *);
+extern void __blk_complete_request(struct request *);
+extern void blk_abort_request(struct request *);
+extern void blk_abort_queue(struct request_queue *);
+
/*
* Access functions for manipulating queue properties
*/
extern void blk_queue_hardsect_size(struct request_queue *, unsigned short);
extern void blk_queue_stack_limits(struct request_queue *t, struct request_queue *b);
extern void blk_queue_dma_pad(struct request_queue *, unsigned int);
+extern void blk_queue_update_dma_pad(struct request_queue *, unsigned int);
extern int blk_queue_dma_drain(struct request_queue *q,
dma_drain_needed_fn *dma_drain_needed,
void *buf, unsigned int size);
+extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
extern void blk_queue_merge_bvec(struct request_queue *, merge_bvec_fn *);
extern void blk_queue_dma_alignment(struct request_queue *, int);
extern void blk_queue_update_dma_alignment(struct request_queue *, int);
extern void blk_queue_softirq_done(struct request_queue *, softirq_done_fn *);
+extern void blk_queue_set_discard(struct request_queue *, prepare_discard_fn *);
+extern void blk_queue_rq_timed_out(struct request_queue *, rq_timed_out_fn *);
+extern void blk_queue_rq_timeout(struct request_queue *, unsigned int);
extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bdev);
extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
-extern int blk_do_ordered(struct request_queue *, struct request **);
+extern bool blk_do_ordered(struct request_queue *, struct request **);
extern unsigned blk_ordered_cur_seq(struct request_queue *);
extern unsigned blk_ordered_req_seq(struct request *);
-extern void blk_ordered_complete_seq(struct request_queue *, unsigned, int);
+extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int);
extern int blk_rq_map_sg(struct request_queue *, struct request *, struct scatterlist *);
extern void blk_dump_rq_flags(struct request *, char *);
extern void generic_unplug_device(struct request_queue *);
-extern void __generic_unplug_device(struct request_queue *);
extern long nr_blockdev_pages(void);
int blk_get_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)->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 int blkdev_issue_flush(struct block_device *, sector_t *);
+extern int blkdev_issue_discard(struct block_device *,
+ sector_t sector, sector_t nr_sects, gfp_t);
+
+static inline int sb_issue_discard(struct super_block *sb,
+ sector_t block, sector_t nr_blocks)
+{
+ block <<= (sb->s_blocksize_bits - 9);
+ nr_blocks <<= (sb->s_blocksize_bits - 9);
+ return blkdev_issue_discard(sb->s_bdev, block, nr_blocks, GFP_KERNEL);
+}
+
+/*
+* command filter functions
+*/
+extern int blk_verify_command(struct blk_cmd_filter *filter,
+ unsigned char *cmd, fmode_t has_write_perm);
+extern void blk_unregister_filter(struct gendisk *disk);
+extern void blk_set_cmd_filter_defaults(struct blk_cmd_filter *filter);
#define MAX_PHYS_SEGMENTS 128
#define MAX_HW_SEGMENTS 128
#define MAX_SEGMENT_SIZE 65536
+#define BLK_SEG_BOUNDARY_MASK 0xFFFFFFFFUL
+
#define blkdev_entry_to_request(entry) list_entry((entry), struct request, queuelist)
static inline int queue_hardsect_size(struct request_queue *q)
return q ? q->dma_alignment : 511;
}
+static inline int blk_rq_aligned(struct request_queue *q, void *addr,
+ unsigned int len)
+{
+ unsigned int alignment = queue_dma_alignment(q) | q->dma_pad_mask;
+ return !((unsigned long)addr & alignment) && !(len & alignment);
+}
+
/* assumes size > 256 */
static inline unsigned int blksize_bits(unsigned int size)
{
}
struct work_struct;
-int kblockd_schedule_work(struct work_struct *work);
-void kblockd_flush_work(struct work_struct *work);
+int kblockd_schedule_work(struct request_queue *q, struct work_struct *work);
#define MODULE_ALIAS_BLOCKDEV(major,minor) \
MODULE_ALIAS("block-major-" __stringify(major) "-" __stringify(minor))
#define MODULE_ALIAS_BLOCKDEV_MAJOR(major) \
MODULE_ALIAS("block-major-" __stringify(major) "-*")
-
#if defined(CONFIG_BLK_DEV_INTEGRITY)
-#define INTEGRITY_FLAG_READ 1 /* verify data integrity on read */
-#define INTEGRITY_FLAG_WRITE 2 /* generate data integrity on write */
+#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;
extern int blk_integrity_register(struct gendisk *, struct blk_integrity *);
extern void blk_integrity_unregister(struct gendisk *);
-extern int blk_integrity_compare(struct block_device *, struct block_device *);
+extern int blk_integrity_compare(struct gendisk *, struct gendisk *);
extern int blk_rq_map_integrity_sg(struct request *, struct scatterlist *);
extern int blk_rq_count_integrity_sg(struct request *);
-static inline unsigned short blk_integrity_tuple_size(struct blk_integrity *bi)
-{
- if (bi)
- return bi->tuple_size;
-
- return 0;
-}
-
-static inline struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
+static inline
+struct blk_integrity *bdev_get_integrity(struct block_device *bdev)
{
return bdev->bd_disk->integrity;
}
-static inline unsigned int bdev_get_tag_size(struct block_device *bdev)
+static inline struct blk_integrity *blk_get_integrity(struct gendisk *disk)
{
- struct blk_integrity *bi = bdev_get_integrity(bdev);
-
- if (bi)
- return bi->tag_size;
-
- return 0;
-}
-
-static inline int bdev_integrity_enabled(struct block_device *bdev, int rw)
-{
- struct blk_integrity *bi = bdev_get_integrity(bdev);
-
- if (bi == NULL)
- return 0;
-
- if (rw == READ && bi->verify_fn != NULL &&
- test_bit(INTEGRITY_FLAG_READ, &bi->flags))
- return 1;
-
- if (rw == WRITE && bi->generate_fn != NULL &&
- test_bit(INTEGRITY_FLAG_WRITE, &bi->flags))
- return 1;
-
- return 0;
+ return disk->integrity;
}
static inline int blk_integrity_rq(struct request *rq)
{
- BUG_ON(rq->bio == NULL);
+ if (rq->bio == NULL)
+ return 0;
return bio_integrity(rq->bio);
}
#define blk_rq_count_integrity_sg(a) (0)
#define blk_rq_map_integrity_sg(a, b) (0)
#define bdev_get_integrity(a) (0)
-#define bdev_get_tag_size(a) (0)
+#define blk_get_integrity(a) (0)
#define blk_integrity_compare(a, b) (0)
#define blk_integrity_register(a, b) (0)
#define blk_integrity_unregister(a) do { } while (0);
#endif /* CONFIG_BLK_DEV_INTEGRITY */
+struct block_device_operations {
+ int (*open) (struct block_device *, fmode_t);
+ int (*release) (struct gendisk *, fmode_t);
+ int (*locked_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
+ int (*ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
+ int (*compat_ioctl) (struct block_device *, fmode_t, unsigned, unsigned long);
+ int (*direct_access) (struct block_device *, sector_t,
+ void **, unsigned long *);
+ int (*media_changed) (struct gendisk *);
+ int (*revalidate_disk) (struct gendisk *);
+ int (*getgeo)(struct block_device *, struct hd_geometry *);
+ struct module *owner;
+};
+extern int __blkdev_driver_ioctl(struct block_device *, fmode_t, unsigned int,
+ unsigned long);
#else /* CONFIG_BLOCK */
/*
* stubs for when the block layer is configured out
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff