diff options
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 35 |
1 files changed, 32 insertions, 3 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 5615a3c9e410..83eef4fde873 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -93,6 +93,9 @@ struct io_context *get_io_context(int gfp_flags); 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 *); + struct request_list { int count[2]; int starved[2]; @@ -176,6 +179,12 @@ struct request { * For Power Management requests */ struct request_pm_state *pm; + + /* + * completion callback. end_io_data should be folded in with waiting + */ + rq_end_io_fn *end_io; + void *end_io_data; }; /* @@ -266,6 +275,8 @@ struct bio_vec; typedef int (merge_bvec_fn) (request_queue_t *, struct bio *, struct bio_vec *); typedef void (activity_fn) (void *data, int rw); typedef int (issue_flush_fn) (request_queue_t *, struct gendisk *, sector_t *); +typedef int (prepare_flush_fn) (request_queue_t *, struct request *); +typedef void (end_flush_fn) (request_queue_t *, struct request *); enum blk_queue_state { Queue_down, @@ -309,6 +320,8 @@ struct request_queue merge_bvec_fn *merge_bvec_fn; activity_fn *activity_fn; issue_flush_fn *issue_flush_fn; + prepare_flush_fn *prepare_flush_fn; + end_flush_fn *end_flush_fn; /* * Auto-unplugging state @@ -380,6 +393,18 @@ struct request_queue unsigned int sg_reserved_size; struct list_head drain_list; + + /* + * reserved for flush operations + */ + struct request *flush_rq; + unsigned char ordered; +}; + +enum { + QUEUE_ORDERED_NONE, + QUEUE_ORDERED_TAG, + QUEUE_ORDERED_FLUSH, }; #define RQ_INACTIVE (-1) @@ -396,12 +421,13 @@ struct request_queue #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_ORDERED 8 /* supports ordered writes */ -#define QUEUE_FLAG_DRAIN 9 /* draining queue for sched switch */ +#define QUEUE_FLAG_DRAIN 8 /* draining queue for sched switch */ +#define QUEUE_FLAG_FLUSH 9 /* doing barrier flush 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_stopped(q) test_bit(QUEUE_FLAG_STOPPED, &(q)->queue_flags) +#define blk_queue_flushing(q) test_bit(QUEUE_FLAG_FLUSH, &(q)->queue_flags) #define blk_fs_request(rq) ((rq)->flags & REQ_CMD) #define blk_pc_request(rq) ((rq)->flags & REQ_BLOCK_PC) @@ -509,10 +535,10 @@ extern void blk_unregister_queue(struct gendisk *disk); extern void register_disk(struct gendisk *dev); extern void generic_make_request(struct bio *bio); extern void blk_put_request(struct request *); +extern void blk_end_sync_rq(struct request *rq); extern void blk_attempt_remerge(request_queue_t *, struct request *); extern void __blk_attempt_remerge(request_queue_t *, struct request *); extern struct request *blk_get_request(request_queue_t *, int, int); -extern void blk_put_request(struct request *); extern void blk_insert_request(request_queue_t *, struct request *, int, void *, int); extern void blk_requeue_request(request_queue_t *, struct request *); extern void blk_plug_device(request_queue_t *); @@ -602,6 +628,9 @@ extern struct backing_dev_info *blk_get_backing_dev_info(struct block_device *bd extern void blk_queue_ordered(request_queue_t *, int); extern void blk_queue_issue_flush_fn(request_queue_t *, issue_flush_fn *); extern int blkdev_scsi_issue_flush_fn(request_queue_t *, struct gendisk *, sector_t *); +extern struct request *blk_start_pre_flush(request_queue_t *,struct request *); +extern int blk_complete_barrier_rq(request_queue_t *, struct request *, int); +extern int blk_complete_barrier_rq_locked(request_queue_t *, struct request *, int); extern int blk_rq_map_sg(request_queue_t *, struct request *, struct scatterlist *); extern void blk_dump_rq_flags(struct request *, char *); |