#ifndef _LINUX_BLKDEV_H
#define _LINUX_BLKDEV_H
+#ifdef CONFIG_BLOCK
+
#include <linux/sched.h>
#include <linux/major.h>
#include <linux/genhd.h>
#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>
-#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;
struct elevator_queue;
-typedef struct elevator_queue elevator_t;
struct request_pm_state;
struct blk_trace;
struct request;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
-/*
- * This is the per-process anticipatory I/O scheduler state.
- */
-struct as_io_context {
- spinlock_t lock;
-
- void (*dtor)(struct as_io_context *aic); /* destructor */
- void (*exit)(struct as_io_context *aic); /* called on task exit */
-
- unsigned long state;
- atomic_t nr_queued; /* queued reads & sync writes */
- atomic_t nr_dispatched; /* number of requests gone to the drivers */
-
- /* IO History tracking */
- /* Thinktime */
- unsigned long last_end_request;
- unsigned long ttime_total;
- unsigned long ttime_samples;
- unsigned long ttime_mean;
- /* Layout pattern */
- unsigned int seek_samples;
- sector_t last_request_pos;
- u64 seek_total;
- sector_t seek_mean;
-};
-
-struct cfq_queue;
-struct cfq_io_context {
- struct rb_node rb_node;
- void *key;
-
- struct cfq_queue *cfqq[2];
-
- struct io_context *ioc;
-
- unsigned long last_end_request;
- sector_t last_request_pos;
-
- unsigned long ttime_total;
- unsigned long ttime_samples;
- unsigned long ttime_mean;
-
- 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 */
-};
-
-/*
- * This is the per-process I/O subsystem state. It is refcounted and
- * kmalloc'ed. Currently all fields are modified in process io context
- * (apart from the atomic refcount), so require no locking.
- */
-struct io_context {
- atomic_t refcount;
- struct task_struct *task;
-
- unsigned int ioprio_changed;
-
- /*
- * For request batching
- */
- unsigned long last_waited; /* Time last woken after wait for request */
- int nr_batch_requests; /* Number of requests left in the batch */
-
- struct as_io_context *aic;
- struct rb_root cic_root;
- void *ioc_data;
-};
-
-void put_io_context(struct io_context *ioc);
-void exit_io_context(void);
-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 *, 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 */
/*
* 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,
};
*
*/
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 */
};
/*
- * request type modified bits. first three bits match BIO_RW* bits, important
+ * request type modified bits. first four 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 */
+ /* above flags must match BIO_RW_* */
+ __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_MIXED_MERGE, /* merge of different types, fail separately */
__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_SYNC (1 << __REQ_RW_SYNC)
#define REQ_ALLOCED (1 << __REQ_ALLOCED)
#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 REQ_MIXED_MERGE (1 << __REQ_MIXED_MERGE)
+
+#define REQ_FAILFAST_MASK (REQ_FAILFAST_DEV | REQ_FAILFAST_TRANSPORT | \
+ REQ_FAILFAST_DRIVER)
#define BLK_MAX_CDB 16
/*
- * try to put the fields that are referenced together in the same cacheline
+ * 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:rq_init()
+ * as well!
*/
struct request {
struct list_head queuelist;
- struct list_head donelist;
+ struct call_single_data csd;
+ int cpu;
- request_queue_t *q;
+ 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;
/*
* when request is used as a packet command carrier
*/
- unsigned int cmd_len;
- unsigned char cmd[BLK_MAX_CDB];
+ unsigned short cmd_len;
+ 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.
#include <linux/elevator.h>
-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 int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *);
-typedef void (prepare_flush_fn) (request_queue_t *, struct request *);
+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,
struct blk_queue_tag {
struct request **tag_index; /* map of busy tags */
unsigned long *tag_map; /* bit map of free/busy tags */
- struct list_head busy_list; /* fifo list of busy tags */
int busy; /* current depth */
int max_depth; /* what we will send to device */
int real_max_depth; /* what the array can hold */
atomic_t refcnt; /* map can be shared */
};
+#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_hw_segments;
+ unsigned short max_phys_segments;
+
+ unsigned char misaligned;
+ unsigned char discard_misaligned;
+ unsigned char no_cluster;
+ signed char discard_zeroes_data;
+};
+
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
prep_rq_fn *prep_rq_fn;
unplug_fn *unplug_fn;
merge_bvec_fn *merge_bvec_fn;
- issue_flush_fn *issue_flush_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
/*
* 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;
unsigned int dma_alignment;
struct blk_queue_tag *queue_tags;
+ 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
int orderr, ordcolor;
struct request pre_flush_rq, bar_rq, post_flush_rq;
struct request *orig_bar_rq;
- unsigned int bi_size;
struct mutex sysfs_lock;
#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_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_CQ 16 /* hardware does queuing */
+#define QUEUE_FLAG_DISCARD 17 /* supports DISCARD */
+
+#define QUEUE_FLAG_DEFAULT ((1 << QUEUE_FLAG_IO_STAT) | \
+ (1 << QUEUE_FLAG_CLUSTER) | \
+ (1 << QUEUE_FLAG_STACKABLE) | \
+ (1 << QUEUE_FLAG_SAME_COMP))
+
+static inline int queue_is_locked(struct request_queue *q)
+{
+#ifdef CONFIG_SMP
+ spinlock_t *lock = q->queue_lock;
+ return lock && spin_is_locked(lock);
+#else
+ return 1;
+#endif
+}
+
+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)
+{
+ 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));
+ __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)
+{
+ WARN_ON_ONCE(!queue_is_locked(q));
+ __clear_bit(flag, &q->queue_flags);
+}
enum {
/*
* 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_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_queuing(q) test_bit(QUEUE_FLAG_CQ, &(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_queue_discard(q) test_bit(QUEUE_FLAG_DISCARD, &(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_rq_quiet(rq) ((rq)->cmd_flags & REQ_QUIET)
-#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)
+/* 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)
/*
- * 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)
- set_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
+ if (sync)
+ queue_flag_set(QUEUE_FLAG_SYNCFULL, q);
else
- set_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
+ 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)
- clear_bit(QUEUE_FLAG_READFULL, &q->queue_flags);
+ if (sync)
+ queue_flag_clear(QUEUE_FLAG_SYNCFULL, q);
else
- clear_bit(QUEUE_FLAG_WRITEFULL, &q->queue_flags);
+ 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
* 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)
-#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
+#else
+#define BLK_BOUNCE_HIGH -1ULL
+#endif
+#define BLK_BOUNCE_ANY (-1ULL)
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
/*
* default timeout for SG_IO if none specified
*/
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
+#define BLK_MIN_SG_TIMEOUT (7 * HZ)
-#ifdef CONFIG_MMU
+#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 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 register_disk(struct gendisk *dev);
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(request_queue_t *, struct request *);
-extern void blk_end_sync_rq(struct request *rq, int error);
-extern struct request *blk_get_request(request_queue_t *, int, gfp_t);
-extern void blk_insert_request(request_queue_t *, struct request *, int, void *);
-extern void blk_requeue_request(request_queue_t *, struct request *);
-extern void blk_plug_device(request_queue_t *);
-extern int blk_remove_plug(request_queue_t *);
-extern void blk_recount_segments(request_queue_t *, struct bio *);
-extern int scsi_cmd_ioctl(struct file *, struct 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 ll_back_merge_fn(request_queue_t *, struct request *, struct bio *);
+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 *);
+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 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 *);
/*
* 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(request_queue_t *q, int rw)
+static inline void blk_clear_queue_congested(struct request_queue *q, int sync)
{
- clear_bdi_congested(&q->backing_dev_info, rw);
+ 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(request_queue_t *q, int rw)
+static inline void blk_set_queue_congested(struct request_queue *q, int sync)
{
- set_bdi_congested(&q->backing_dev_info, rw);
+ set_bdi_congested(&q->backing_dev_info, sync);
}
-extern void blk_start_queue(request_queue_t *q);
-extern void blk_stop_queue(request_queue_t *q);
+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_start_queueing(request_queue_t *);
-extern int blk_rq_map_user(request_queue_t *, struct request *, void __user *, unsigned long);
+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 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(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, unsigned int);
-extern int blk_execute_rq(request_queue_t *, struct gendisk *,
+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(request_queue_t *, struct gendisk *,
+extern void blk_execute_rq_nowait(struct request_queue *, struct gendisk *,
struct request *, int, rq_end_io_fn *);
-extern int blk_fill_sghdr_rq(request_queue_t *, struct request *,
- struct sg_io_hdr *, int);
-extern int blk_unmap_sghdr_rq(struct request *, struct sg_io_hdr *);
-extern int blk_complete_sghdr_rq(struct request *, struct sg_io_hdr *,
- struct bio *);
-extern int blk_verify_command(unsigned char *, int);
+extern void blk_unplug(struct request_queue *q);
-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;
}
-static inline void blk_run_backing_dev(struct backing_dev_info *bdi,
- struct page *page)
+/*
+ * 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
+ * blk_rq_err_sectors() : sectors left till the next error boundary
+ */
+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)
{
- if (bdi && bdi->unplug_io_fn)
- bdi->unplug_io_fn(bdi, page);
+ return rq->bio ? bio_cur_bytes(rq->bio) : 0;
}
-static inline void blk_run_address_space(struct address_space *mapping)
+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)
{
- if (mapping)
- blk_run_backing_dev(mapping->backing_dev_info, NULL);
+ return blk_rq_cur_bytes(rq) >> 9;
+}
+
+static inline unsigned int blk_rq_err_sectors(const struct request *rq)
+{
+ return blk_rq_err_bytes(rq) >> 9;
}
/*
- * end_request() and friends. Must be called with the request queue spinlock
- * acquired. All functions called within end_request() _must_be_ atomic.
- *
- * Several drivers define their own end_request and call
- * end_that_request_first() and end_that_request_last()
- * for parts of the original function. This prevents
- * code duplication in drivers.
+ * Request issue related functions.
*/
-extern int end_that_request_first(struct request *, int, int);
-extern int end_that_request_chunk(struct request *, int, int);
-extern void end_that_request_last(struct request *, int);
-extern void end_request(struct request *req, int uptodate);
-extern void blk_complete_request(struct request *);
+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);
/*
- * end_that_request_first/chunk() takes an uptodate argument. we account
- * any value <= as an io error. 0 means -EIO for compatability reasons,
- * any other < 0 value is the direct error type. An uptodate value of
- * 1 indicates successful io completion
+ * 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.
*/
-#define end_io_error(uptodate) (unlikely((uptodate) <= 0))
+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);
-static inline void blkdev_dequeue_request(struct request *req)
-{
- elv_dequeue_request(req->q, req);
-}
+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 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 int);
-extern void blk_queue_max_phys_segments(request_queue_t *, unsigned short);
-extern void blk_queue_max_hw_segments(request_queue_t *, unsigned short);
-extern void blk_queue_max_segment_size(request_queue_t *, unsigned int);
-extern void blk_queue_hardsect_size(request_queue_t *, unsigned short);
-extern void blk_queue_stack_limits(request_queue_t *t, request_queue_t *b);
-extern void blk_queue_segment_boundary(request_queue_t *, unsigned long);
-extern void blk_queue_prep_rq(request_queue_t *, prep_rq_fn *pfn);
-extern void blk_queue_merge_bvec(request_queue_t *, merge_bvec_fn *);
-extern void blk_queue_dma_alignment(request_queue_t *, int);
-extern void blk_queue_softirq_done(request_queue_t *, softirq_done_fn *);
+extern struct 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_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_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 short);
+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 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);
+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_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(request_queue_t *, unsigned, prepare_flush_fn *);
-extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *);
-extern int blk_do_ordered(request_queue_t *, struct request **);
-extern unsigned blk_ordered_cur_seq(request_queue_t *);
+extern int blk_queue_ordered(struct request_queue *, unsigned, prepare_flush_fn *);
+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(request_queue_t *, unsigned, int);
+extern bool blk_ordered_complete_seq(struct request_queue *, unsigned, int);
-extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *);
+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 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);
-extern void blk_put_queue(request_queue_t *);
+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)->cmd_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 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 *);
return bqt->tag_index[tag];
}
-extern void blk_rq_bio_prep(request_queue_t *, struct request *, struct bio *);
extern int blkdev_issue_flush(struct block_device *, sector_t *);
+#define DISCARD_FL_WAIT 0x01 /* wait for completion */
+#define DISCARD_FL_BARRIER 0x02 /* issue DISCARD_BARRIER request */
+extern int blkdev_issue_discard(struct block_device *, sector_t sector,
+ sector_t nr_sects, gfp_t, int flags);
+
+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,
+ DISCARD_FL_BARRIER);
+}
+
+extern int blk_verify_command(unsigned char *cmd, fmode_t has_write_perm);
#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(request_queue_t *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_hardsect_size(bdev_get_queue(bdev));
+ return queue_logical_block_size(bdev_get_queue(bdev));
}
-static inline int queue_dma_alignment(request_queue_t *q)
+static inline unsigned int queue_physical_block_size(struct request_queue *q)
{
- int retval = 511;
+ return q->limits.physical_block_size;
+}
- if (q && q->dma_alignment)
- retval = q->dma_alignment;
+static inline int bdev_physical_block_size(struct block_device *bdev)
+{
+ return queue_physical_block_size(bdev_get_queue(bdev));
+}
- return retval;
+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_sector_alignment_offset(struct request_queue *q,
+ sector_t sector)
+{
+ return ((sector << 9) - q->limits.alignment_offset)
+ & (q->limits.io_min - 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_sector_discard_alignment(struct request_queue *q,
+ sector_t sector)
+{
+ return ((sector << 9) - q->limits.discard_alignment)
+ & (q->limits.discard_granularity - 1);
+}
+
+static inline unsigned int queue_discard_zeroes_data(struct request_queue *q)
+{
+ if (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, 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 */
}
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 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 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 *, struct scatterlist *);
+extern int blk_rq_count_integrity_sg(struct request *);
+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);
+}
+
+#else /* CONFIG_BLK_DEV_INTEGRITY */
+
+#define blk_integrity_rq(rq) (0)
+#define blk_rq_count_integrity_sg(a) (0)
+#define blk_rq_map_integrity_sg(a, b) (0)
+#define bdev_get_integrity(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 *);
+ 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;
+};
+
+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
return 0;
}
-static inline void exit_io_context(void)
-{
-}
-
#endif /* CONFIG_BLOCK */
#endif