diff options
| author | Jens Axboe <axboe@suse.de> | 2002-10-27 17:15:53 -0800 |
|---|---|---|
| committer | Jens Axboe <axboe@suse.de> | 2002-10-27 17:15:53 -0800 |
| commit | 0717c0a96379ba634411b99a806587acad9f9fee (patch) | |
| tree | 173d677d682cde28dbb823a72fe82120a90c267c /include/linux/blkdev.h | |
| parent | 8c1f67fa9454c9d86ad4124bd2e5d1b2720b4e1e (diff) | |
[PATCH] make queue prep_rq_fn() a bit more powerful
Extend q->prep_rq_fn() to return one of three values:
o BLKPREP_OK: request is good, return it
o BLKPREP_KILL: request is bad, end it completely
o BLKPREP_DEFER: request is good, but we can't take it now
We maintain compatability with old prep functions (if any, outside of
ide-cd). This change is needed or SCSI to use prep function for command
init, if sg table allocation fails we can just defer the request.
Diffstat (limited to 'include/linux/blkdev.h')
| -rw-r--r-- | include/linux/blkdev.h | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6437522be832..7ac2b3bb88e5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -254,6 +254,13 @@ struct request_queue */ #define blk_queue_headactive(q, head_active) +/* + * q->prep_rq_fn return values + */ +#define BLKPREP_OK 0 /* serve it */ +#define BLKPREP_KILL 1 /* fatal error, kill */ +#define BLKPREP_DEFER 2 /* leave on queue */ + extern unsigned long blk_max_low_pfn, blk_max_pfn; /* |