Commit 1e87901e authored by Tejun Heo's avatar Tejun Heo Committed by Jens Axboe
Browse files

block: filter flush bio's in __generic_make_request()

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
Signed-off-by: default avatarTejun Heo <>
Signed-off-by: default avatarJens Axboe <>
parent 4fed947c
......@@ -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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