#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);
+struct io_context *alloc_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);
* 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,
};
struct bio_vec;
typedef int (merge_bvec_fn) (struct request_queue *, struct bio *, struct bio_vec *);
-typedef int (issue_flush_fn) (struct request_queue *, struct gendisk *, sector_t *);
typedef void (prepare_flush_fn) (struct request_queue *, struct request *);
typedef void (softirq_done_fn)(struct request *);
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 */
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;
unsigned int dma_alignment;
struct blk_queue_tag *queue_tags;
+ struct list_head tag_busy_list;
unsigned int nr_sorted;
unsigned int in_flight;
#define blk_barrier_rq(rq) ((rq)->cmd_flags & REQ_HARDBARRIER)
#define blk_fua_rq(rq) ((rq)->cmd_flags & REQ_FUA)
#define blk_bidi_rq(rq) ((rq)->next_rq != NULL)
+#define blk_empty_barrier(rq) (blk_barrier_rq(rq) && blk_fs_request(rq) && !(rq)->hard_nr_sectors)
#define list_entry_rq(ptr) list_entry((ptr), struct request, queuelist)
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)
{
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 end_request(struct request *, int);
+extern void end_queued_request(struct request *, int);
+extern void end_dequeued_request(struct request *, int);
extern void blk_complete_request(struct request *);
/*
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 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 void blk_queue_issue_flush_fn(struct request_queue *, issue_flush_fn *);
extern int blk_do_ordered(struct request_queue *, struct request **);
extern unsigned blk_ordered_cur_seq(struct request_queue *);
extern unsigned blk_ordered_req_seq(struct request *);
{
}
+static inline int put_io_context(struct io_context *ioc)
+{
+ return 1;
+}
+
+
#endif /* CONFIG_BLOCK */
#endif
projects / deliverable / linux.git / blobdiff