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block: implement an unprep function corresponding directly to prep 

Reviewed-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
This commit is contained in:
James Bottomley 2010-07-01 19:49:17 +09:00 committed by Jens Axboe
parent e597cd09f7
commit 28018c242a
4 changed files with 47 additions and 1 deletions
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25
block/blk-core.c
View File

@ -608,6 +608,7 @@ blk_init_allocated_queue_node(struct request_queue *q, request_fn_proc *rfn,
q->request_fn = rfn;
q->prep_rq_fn = NULL;
q->unprep_rq_fn = NULL;
q->unplug_fn = generic_unplug_device;
q->queue_flags = QUEUE_FLAG_DEFAULT;
q->queue_lock = lock;
@ -2133,6 +2134,26 @@ static bool blk_update_bidi_request(struct request *rq, int error,
return false;
}
/**
* blk_unprep_request - unprepare a request
* @req: the request
*
* This function makes a request ready for complete resubmission (or
* completion). It happens only after all error handling is complete,
* so represents the appropriate moment to deallocate any resources
* that were allocated to the request in the prep_rq_fn. The queue
* lock is held when calling this.
*/
void blk_unprep_request(struct request *req)
{
struct request_queue *q = req->q;
req->cmd_flags &= ~REQ_DONTPREP;
if (q->unprep_rq_fn)
q->unprep_rq_fn(q, req);
}
EXPORT_SYMBOL_GPL(blk_unprep_request);
/*
* queue lock must be held
*/
@ -2148,6 +2169,10 @@ static void blk_finish_request(struct request *req, int error)
blk_delete_timer(req);
if (req->cmd_flags & REQ_DONTPREP)
blk_unprep_request(req);
blk_account_io_done(req);
if (req->end_io)

17
block/blk-settings.c
View File

@ -36,6 +36,23 @@ void blk_queue_prep_rq(struct request_queue *q, prep_rq_fn *pfn)
}
EXPORT_SYMBOL(blk_queue_prep_rq);
/**
* blk_queue_unprep_rq - set an unprepare_request function for queue
* @q: queue
* @ufn: unprepare_request function
*
* It's possible for a queue to register an unprepare_request callback
* which is invoked before the request is finally completed. The goal
* of the function is to deallocate any data that was allocated in the
* prepare_request callback.
*
*/
void blk_queue_unprep_rq(struct request_queue *q, unprep_rq_fn *ufn)
{
q->unprep_rq_fn = ufn;
}
EXPORT_SYMBOL(blk_queue_unprep_rq);
/**
* blk_queue_merge_bvec - set a merge_bvec function for queue
* @q: queue

2
drivers/scsi/scsi_lib.c
View File

@ -85,7 +85,7 @@ static void scsi_unprep_request(struct request *req)
{
struct scsi_cmnd *cmd = req->special;
req->cmd_flags &= ~REQ_DONTPREP;
blk_unprep_request(req);
req->special = NULL;
scsi_put_command(cmd);

4
include/linux/blkdev.h
View File

@ -200,6 +200,7 @@ struct request_pm_state
typedef void (request_fn_proc) (struct request_queue *q);
typedef int (make_request_fn) (struct request_queue *q, struct bio *bio);
typedef int (prep_rq_fn) (struct request_queue *, struct request *);
typedef void (unprep_rq_fn) (struct request_queue *, struct request *);
typedef void (unplug_fn) (struct request_queue *);
struct bio_vec;
@ -282,6 +283,7 @@ struct request_queue
request_fn_proc *request_fn;
make_request_fn *make_request_fn;
prep_rq_fn *prep_rq_fn;
unprep_rq_fn *unprep_rq_fn;
unplug_fn *unplug_fn;
merge_bvec_fn *merge_bvec_fn;
prepare_flush_fn *prepare_flush_fn;
@ -841,6 +843,7 @@ extern void blk_complete_request(struct request *);
extern void __blk_complete_request(struct request *);
extern void blk_abort_request(struct request *);
extern void blk_abort_queue(struct request_queue *);
extern void blk_unprep_request(struct request *);
/*
* Access functions for manipulating queue properties
@ -885,6 +888,7 @@ extern int blk_queue_dma_drain(struct request_queue *q,
extern void blk_queue_lld_busy(struct request_queue *q, lld_busy_fn *fn);
extern void blk_queue_segment_boundary(struct request_queue *, unsigned long);
extern void blk_queue_prep_rq(struct request_queue *, prep_rq_fn *pfn);
extern void blk_queue_unprep_rq(struct request_queue *, unprep_rq_fn *ufn);
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);