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>
diff --git a/block/blk-core.c b/block/blk-core.c
index 213e9f0..18faa7e 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -145,7 +145,6 @@
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 @@
{
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 ae4f27d..6b18d82 100644
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -24,7 +24,6 @@
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 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 f5c7596..0a8da96 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -160,8 +160,6 @@
unsigned short ioprio;
- int ref_count;
-
void *special; /* opaque pointer available for LLD use */
char *buffer; /* kaddr of the current segment if available */