block: filter flush bio's in __generic_make_request() (1e87901e) · Commits · 戴 / test

There are a number of make_request based drivers which don't support cache flushes. Filter out flush bio's in __generic_make_request() so that they don't have to worry about them. All FLUSH/FUA requests with data are converted to regular IO requests and empty ones are completed immediately. Signed-off-by:

Tejun Heo <tj@kernel.org> Signed-off-by:

Jens Axboe <jaxboe@fusionio.com>

block/blk-core.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -1509,6 +1509,19 @@ static inline void __generic_make_request(struct bio *bio)
		if (bio_check_eod(bio, nr_sectors))
		goto end_io;

		/*
		* Filter flush bio's early so that make_request based
		* drivers without flush support don't have to worry
		* about them.
		*/
		if ((bio->bi_rw & (REQ_FLUSH \| REQ_FUA)) && !q->flush_flags) {
		bio->bi_rw &= ~(REQ_FLUSH \| REQ_FUA);
		if (!nr_sectors) {
		err = 0;
		goto end_io;
		}
		}

		if ((bio->bi_rw & REQ_DISCARD) &&
		(!blk_queue_discard(q) \|\|
		((bio->bi_rw & REQ_SECURE) &&

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