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authorJohn Garry <john.garry@huawei.com>2022-07-06 15:03:50 +0300
committerJens Axboe <axboe@kernel.dk>2022-07-06 15:33:53 +0300
commit99e48cd6855e9535488e3c90d65edd46c6e6fc1b (patch)
treef8b9316c1622b40713d58def0ea95b940792945e /block
parentdeef1be18e3fc62ddf04fb3e5e8ff6a301693dcc (diff)
downloadlinux-99e48cd6855e9535488e3c90d65edd46c6e6fc1b.tar.xz
blk-mq: Add a flag for reserved requests
Add a flag for reserved requests so that drivers may know this for any special handling. Signed-off-by: John Garry <john.garry@huawei.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Link: https://lore.kernel.org/r/1657109034-206040-3-git-send-email-john.garry@huawei.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'block')
-rw-r--r--block/blk-mq.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 15c7c5c4ad22..a00e43cc67e5 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -475,6 +475,9 @@ retry:
if (!(data->rq_flags & RQF_ELV))
blk_mq_tag_busy(data->hctx);
+ if (data->flags & BLK_MQ_REQ_RESERVED)
+ data->rq_flags |= RQF_RESV;
+
/*
* Try batched alloc if we want more than 1 tag.
*/
@@ -589,6 +592,9 @@ struct request *blk_mq_alloc_request_hctx(struct request_queue *q,
else
data.rq_flags |= RQF_ELV;
+ if (flags & BLK_MQ_REQ_RESERVED)
+ data.rq_flags |= RQF_RESV;
+
ret = -EWOULDBLOCK;
tag = blk_mq_get_tag(&data);
if (tag == BLK_MQ_NO_TAG)