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blk-mq: allow drivers to hook into I/O completion

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Split out the bottom half of blk_mq_end_io so that drivers can perform
work when they know a request has been completed, but before it has been
freed.  This also obsoletes blk_mq_end_io_partial as drivers can now
pass any value to blk_update_request directly.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig 2014-04-16 09:44:52 +02:00 committed by Jens Axboe
parent 6700a678c0
commit 63151a449e
2 changed files with 12 additions and 13 deletions
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16
block/blk-mq.c
View File

@ -294,20 +294,24 @@ void blk_mq_clone_flush_request(struct request *flush_rq,
hctx->cmd_size);
}
bool blk_mq_end_io_partial(struct request *rq, int error, unsigned int nr_bytes)
inline void __blk_mq_end_io(struct request *rq, int error)
{
if (blk_update_request(rq, error, blk_rq_bytes(rq)))
return true;
blk_account_io_done(rq);
if (rq->end_io)
rq->end_io(rq, error);
else
blk_mq_free_request(rq);
return false;
}
EXPORT_SYMBOL(blk_mq_end_io_partial);
EXPORT_SYMBOL(__blk_mq_end_io);
void blk_mq_end_io(struct request *rq, int error)
{
if (blk_update_request(rq, error, blk_rq_bytes(rq)))
BUG();
__blk_mq_end_io(rq, error);
}
EXPORT_SYMBOL(blk_mq_end_io);
static void __blk_mq_complete_request_remote(void *data)
{

9
include/linux/blk-mq.h
View File

@ -149,13 +149,8 @@ struct blk_mq_hw_ctx *blk_mq_map_queue(struct request_queue *, const int ctx_ind
struct blk_mq_hw_ctx *blk_mq_alloc_single_hw_queue(struct blk_mq_tag_set *, unsigned int);
void blk_mq_free_single_hw_queue(struct blk_mq_hw_ctx *, unsigned int);
bool blk_mq_end_io_partial(struct request *rq, int error,
unsigned int nr_bytes);
static inline void blk_mq_end_io(struct request *rq, int error)
{
bool done = !blk_mq_end_io_partial(rq, error, blk_rq_bytes(rq));
BUG_ON(!done);
}
void blk_mq_end_io(struct request *rq, int error);
void __blk_mq_end_io(struct request *rq, int error);
void blk_mq_complete_request(struct request *rq);