Commit b4a6bb3a authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Damien Le Moal

block: add a sanity check for non-write flush/fua bios

Check that the PREFUSH and FUA flags are only set on write bios,
given that the flush state machine expects that.

[Damien] The check is also extended to REQ_OP_ZONE_APPEND operations as
these are data write operations used by btrfs and zonefs and may also
have the REQ_FUA bit set.
Reported-by: default avatarDamien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarDamien Le Moal <damien.lemoal@opensource.wdc.com>
Reviewed-by: default avatarJens Axboe <axboe@kernel.dk>
Reviewed-by: default avatarNiklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.de>
parent 002c4871
......@@ -744,14 +744,18 @@ void submit_bio_noacct(struct bio *bio)
* Filter flush bio's early so that bio based drivers without flush
* support don't have to worry about them.
*/
if (op_is_flush(bio->bi_opf) &&
!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
if (op_is_flush(bio->bi_opf)) {
if (WARN_ON_ONCE(bio_op(bio) != REQ_OP_WRITE &&
bio_op(bio) != REQ_OP_ZONE_APPEND))
goto end_io;
if (!test_bit(QUEUE_FLAG_WC, &q->queue_flags)) {
bio->bi_opf &= ~(REQ_PREFLUSH | REQ_FUA);
if (!bio_sectors(bio)) {
status = BLK_STS_OK;
goto end_io;
}
}
}
if (!test_bit(QUEUE_FLAG_POLL, &q->queue_flags))
bio_clear_polled(bio);
......
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