block: add bsg helper library

This moves the FC classes bsg code to the block layer and
makes it a lib so that other classes like iscsi and SAS can use it.

It is helpful because working with the request queue, bios,
creating scatterlists, etc are a pain that the LLD does not
have to worry about with normal IOs and should not have to
worry about for bsg requests.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
Mike Christie
2011-07-31 22:05:09 +02:00
committed by Jens Axboe
parent 24c3047095
commit aa387cc895
5 changed files with 385 additions and 0 deletions

View File

@@ -30,6 +30,7 @@ struct request_pm_state;
struct blk_trace;
struct request;
struct sg_io_hdr;
struct bsg_job;
#define BLKDEV_MIN_RQ 4
#define BLKDEV_MAX_RQ 128 /* Default maximum */
@@ -209,6 +210,7 @@ typedef int (merge_bvec_fn) (struct request_queue *, struct bvec_merge_data *,
typedef void (softirq_done_fn)(struct request *);
typedef int (dma_drain_needed_fn)(struct request *);
typedef int (lld_busy_fn) (struct request_queue *q);
typedef int (bsg_job_fn) (struct bsg_job *);
enum blk_eh_timer_return {
BLK_EH_NOT_HANDLED,
@@ -375,6 +377,8 @@ struct request_queue {
struct mutex sysfs_lock;
#if defined(CONFIG_BLK_DEV_BSG)
bsg_job_fn *bsg_job_fn;
int bsg_job_size;
struct bsg_class_device bsg_dev;
#endif