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[PATCH] md: fail IO request to md that require a barrier.

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md does not yet support BIO_RW_BARRIER, so be honest about it and fail
(-EOPNOTSUPP) any such requests.

Signed-off-by: Neil Brown <neilb@cse.unsw.edu.au>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown
2005-09-09 16:23:41 -07:00
committed by Linus Torvalds
parent 3ec67ac1a3
commit e5dcdd80a6
7 changed files with 34 additions and 0 deletions
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5
drivers/md/raid0.c
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@@ -404,6 +404,11 @@ static int raid0_make_request (request_queue_t *q, struct bio *bio)
unsigned long chunk;
sector_t block, rsect;
if (unlikely(bio_barrier(bio))) {
bio_endio(bio, bio->bi_size, -EOPNOTSUPP);
return 0;
}
if (bio_data_dir(bio)==WRITE) {
disk_stat_inc(mddev->gendisk, writes);
disk_stat_add(mddev->gendisk, write_sectors, bio_sectors(bio));