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| author | Christoph Hellwig <hch@infradead.org> | 2013-10-04 06:49:11 -0700 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2013-10-25 11:55:59 +0100 |
| commit | 71fe07d040626de7b72244bf6de889c2e0f5aea3 (patch) | |
| tree | 6c4d6bed7e8510fb2c9a105dba62d2342e6fc897 | |
| parent | 5953316dbf90067ebdeca626c34488bc166b73a8 (diff) | |
| download | linux-0-day-71fe07d040626de7b72244bf6de889c2e0f5aea3.tar.gz linux-0-day-71fe07d040626de7b72244bf6de889c2e0f5aea3.tar.xz | |
block: remove request ref_count
This reference count has been around since before git history, but the only
place where it's used is in blk_execute_rq, and ther it is entirely useless
as it is incremented before submitting the request and decremented in the
end_io handler before waking up the submitter thread.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
| -rw-r--r-- | block/blk-core.c | 3 | ||||
| -rw-r--r-- | block/blk-exec.c | 7 | ||||
| -rw-r--r-- | include/linux/blkdev.h | 2 |
3 files changed, 0 insertions, 12 deletions
diff --git a/block/blk-core.c b/block/blk-core.c index 213e9f01c6277..18faa7e81d3bb 100644 --- a/block/blk-core.c +++ b/block/blk-core.c @@ -145,7 +145,6 @@ void blk_rq_init(struct request_queue *q, struct request *rq) rq->cmd = rq->__cmd; rq->cmd_len = BLK_MAX_CDB; rq->tag = -1; - rq->ref_count = 1; rq->start_time = jiffies; set_start_time_ns(rq); rq->part = NULL; @@ -1272,8 +1271,6 @@ void __blk_put_request(struct request_queue *q, struct request *req) { if (unlikely(!q)) return; - if (unlikely(--req->ref_count)) - return; blk_pm_put_request(req); diff --git a/block/blk-exec.c b/block/blk-exec.c index ae4f27d7944e9..6b18d82d91c57 100644 --- a/block/blk-exec.c +++ b/block/blk-exec.c @@ -24,7 +24,6 @@ static void blk_end_sync_rq(struct request *rq, int error) struct completion *waiting = rq->end_io_data; rq->end_io_data = NULL; - __blk_put_request(rq->q, rq); /* * complete last, if this is a stack request the process (and thus @@ -103,12 +102,6 @@ int blk_execute_rq(struct request_queue *q, struct gendisk *bd_disk, int err = 0; unsigned long hang_check; - /* - * we need an extra reference to the request, so we can look at - * it after io completion - */ - rq->ref_count++; - if (!rq->sense) { memset(sense, 0, sizeof(sense)); rq->sense = sense; diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index f5c7596c93ddb..0a8da96274c35 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -160,8 +160,6 @@ struct request { unsigned short ioprio; - int ref_count; - void *special; /* opaque pointer available for LLD use */ char *buffer; /* kaddr of the current segment if available */ |