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bsg: support for full generic block layer SG v3

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Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2007-07-09 12:38:05 +02:00
parent 8f41958bdd
commit 3d6392cfbd
10 changed files with 1171 additions and 79 deletions
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12
include/linux/blkdev.h
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@@ -41,6 +41,8 @@ struct elevator_queue;
typedef struct elevator_queue elevator_t;
struct request_pm_state;
struct blk_trace;
struct request;
struct sg_io_hdr;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@@ -607,6 +609,11 @@ extern unsigned long blk_max_low_pfn, blk_max_pfn;
#define BLK_BOUNCE_ANY ((u64)blk_max_pfn << PAGE_SHIFT)
#define BLK_BOUNCE_ISA (ISA_DMA_THRESHOLD)
/*
* default timeout for SG_IO if none specified
*/
#define BLK_DEFAULT_SG_TIMEOUT (60 * HZ)
#ifdef CONFIG_MMU
extern int init_emergency_isa_pool(void);
extern void blk_queue_bounce(request_queue_t *q, struct bio **bio);
@@ -680,6 +687,11 @@ extern int blk_execute_rq(request_queue_t *, struct gendisk *,
struct request *, int);
extern void blk_execute_rq_nowait(request_queue_t *, 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 *);
static inline request_queue_t *bdev_get_queue(struct block_device *bdev)
{