block: account statistics for passthrough requests

Presently, passthrough requests are not accounted for because
blk_do_io_stat() expressly rejects them. Based on some digging
in the history, this doesn't seem like a concious decision but
one that evolved from the change from blk_fs_request() to
blk_rq_is_passthrough().

To support this, call blk_account_io_start() in blk_execute_rq_nowait()
and remove the passthrough check in blk_do_io_stat().

Link: https://lore.kernel.org/linux-block/20191010100526.GA27209@lst.de/
Signed-off-by: Logan Gunthorpe <logang@deltatee.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/block/blk-exec.c b/block/blk-exec.c
index 1db44ca..e20a852 100644 (file)
--- a/block/blk-exec.c
+++ b/block/blk-exec.c
@@ -55,6 +55,8 @@ void blk_execute_rq_nowait(struct request_queue *q, struct gendisk *bd_disk,
        rq->rq_disk = bd_disk;
        rq->end_io = done;
 
+       blk_account_io_start(rq, true);
+
        /*
         * don't check dying flag for MQ because the request won't
         * be reused after dying flag is set

diff --git a/block/blk.h b/block/blk.h
index 47fba93..2bea401 100644 (file)
--- a/block/blk.h
+++ b/block/blk.h
@@ -242,14 +242,11 @@ int blk_dev_init(void);
  * Contribute to IO statistics IFF:
  *
  *     a) it's attached to a gendisk, and
- *     b) the queue had IO stats enabled when this request was started, and
- *     c) it's a file system request
+ *     b) the queue had IO stats enabled when this request was started
  */
 static inline bool blk_do_io_stat(struct request *rq)
 {
-       return rq->rq_disk &&
-              (rq->rq_flags & RQF_IO_STAT) &&
-               !blk_rq_is_passthrough(rq);
+       return rq->rq_disk && (rq->rq_flags & RQF_IO_STAT);
 }
 
 static inline void req_set_nomerge(struct request_queue *q, struct request *req)