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author | Christoph Hellwig <hch@lst.de> | 2017-01-25 11:17:11 +0100 |
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committer | Jens Axboe <axboe@fb.com> | 2017-01-27 15:08:35 -0700 |
commit | e6f7f93d58de74700f83dd0547dd4306248a093d (patch) | |
tree | 613eaa03a0b573ca8f0ef82d148bf1303c025d3d /block/blk-core.c | |
parent | 309bd96af9e26da3038661bf5cdad780eef49dd9 (diff) | |
download | linux-stable-e6f7f93d58de74700f83dd0547dd4306248a093d.tar.gz linux-stable-e6f7f93d58de74700f83dd0547dd4306248a093d.tar.bz2 linux-stable-e6f7f93d58de74700f83dd0547dd4306248a093d.zip |
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/blk-core.c')
-rw-r--r-- | block/blk-core.c | 26 |
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); |