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authorChristoph Hellwig <hch@lst.de>2017-01-25 11:17:11 +0100
committerJens Axboe <axboe@fb.com>2017-01-27 15:08:35 -0700
commite6f7f93d58de74700f83dd0547dd4306248a093d (patch)
tree613eaa03a0b573ca8f0ef82d148bf1303c025d3d /block
parent309bd96af9e26da3038661bf5cdad780eef49dd9 (diff)
downloadlinux-e6f7f93d58de74700f83dd0547dd4306248a093d.tar.bz2
block: fix elevator init check
We can't initalize the elevator fields for flushes as flush share space in struct request with the elevator data. But currently we can't communicate that a request is a flush through blk_get_request as we can only pass READ or WRITE, and the low-level code looks at the possible NULL bio to check for a flush. Fix this by allowing to pass any block op and flags, and by checking for the flush flags in __get_request. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com> Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block')
-rw-r--r--block/blk-core.c26
1 files changed, 4 insertions, 22 deletions
diff --git a/block/blk-core.c b/block/blk-core.c
index 02833ce5664e..4cad535592c3 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -1022,25 +1022,6 @@ int blk_update_nr_requests(struct request_queue *q, unsigned int nr)
return 0;
}
-/*
- * Determine if elevator data should be initialized when allocating the
- * request associated with @bio.
- */
-static bool blk_rq_should_init_elevator(struct bio *bio)
-{
- if (!bio)
- return true;
-
- /*
- * Flush requests do not use the elevator so skip initialization.
- * This allows a request to share the flush and elevator data.
- */
- if (op_is_flush(bio->bi_opf))
- return false;
-
- return true;
-}
-
/**
* __get_request - get a free request
* @rl: request list to allocate from
@@ -1119,10 +1100,13 @@ static struct request *__get_request(struct request_list *rl, unsigned int op,
* request is freed. This guarantees icq's won't be destroyed and
* makes creating new ones safe.
*
+ * Flush requests do not use the elevator so skip initialization.
+ * This allows a request to share the flush and elevator data.
+ *
* Also, lookup icq while holding queue_lock. If it doesn't exist,
* it will be created after releasing queue_lock.
*/
- if (blk_rq_should_init_elevator(bio) && !blk_queue_bypass(q)) {
+ if (!op_is_flush(op) && !blk_queue_bypass(q)) {
rq_flags |= RQF_ELVPRIV;
q->nr_rqs_elvpriv++;
if (et->icq_cache && ioc)
@@ -1276,8 +1260,6 @@ static struct request *blk_old_get_request(struct request_queue *q, int rw,
{
struct request *rq;
- BUG_ON(rw != READ && rw != WRITE);
-
/* create ioc upfront */
create_io_context(gfp_mask, q->node);