Commit 2dbe5495 authored Nov 04, 2015 by Jan Kara Committed by Jens Axboe Nov 11, 2015

brd: Refuse improperly aligned discard requests



Currently when improperly aligned discard request is submitted, we just
silently discard more / less data which results in filesystem corruption
in some cases. Refuse such misaligned requests.

Signed-off-by: Jan Kara <jack@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>

parent c5a37883

drivers/block/brd.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -337,6 +337,9 @@ static blk_qc_t brd_make_request(struct request_queue q, struct bio bio)
		goto io_error;

		if (unlikely(bio->bi_rw & REQ_DISCARD)) {
		if (sector & ((PAGE_SIZE >> SECTOR_SHIFT) - 1) \|\|
		bio->bi_iter.bi_size & PAGE_MASK)
		goto io_error;
		discard_from_brd(brd, sector, bio->bi_iter.bi_size);
		goto out;
		}