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scsi: implement .cleanup_rq callback

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Implement .cleanup_rq() callback for freeing driver private part
of the request. Then we can avoid to leak this part if the request isn't
completed by SCSI, and freed by blk-mq or upper layer(such as dm-rq) finally.

Cc: Ewan D. Milne <emilne@redhat.com>
Cc: Bart Van Assche <bvanassche@acm.org>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Cc: dm-devel@redhat.com
Cc: <stable@vger.kernel.org>
Fixes: 396eaf21ee ("blk-mq: improve DM's blk-mq IO merging via blk_insert_cloned_request feedback")
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2019-07-25 10:05:00 +08:00 committed by Jens Axboe
parent 226b4fc75c
commit b7e9e1fb7a
1 changed files with 13 additions and 0 deletions
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13
drivers/scsi/scsi_lib.c
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@ -1089,6 +1089,18 @@ static void scsi_initialize_rq(struct request *rq)
cmd->retries = 0;
}
/*
* Only called when the request isn't completed by SCSI, and not freed by
* SCSI
*/
static void scsi_cleanup_rq(struct request *rq)
{
if (rq->rq_flags & RQF_DONTPREP) {
scsi_mq_uninit_cmd(blk_mq_rq_to_pdu(rq));
rq->rq_flags &= ~RQF_DONTPREP;
}
}
/* Add a command to the list used by the aacraid and dpt_i2o drivers */
void scsi_add_cmd_to_list(struct scsi_cmnd *cmd)
{
@ -1821,6 +1833,7 @@ static const struct blk_mq_ops scsi_mq_ops = {
.init_request = scsi_mq_init_request,
.exit_request = scsi_mq_exit_request,
.initialize_rq_fn = scsi_initialize_rq,
.cleanup_rq = scsi_cleanup_rq,
.busy = scsi_mq_lld_busy,
.map_queues = scsi_map_queues,
};