There are currently any issuer of REQ_OP_ZONE_RESET and REQ_OP_ZONE_FINISH operations that set REQ_NOWAIT. However, as we cannot handle this flag correctly due to the potential request allocation failure that may happen in blk_mq_submit_bio() after blk_zone_plug_bio() has handled the zone write plug write pointer updates for the targeted zones, modify blk_zone_wplug_handle_reset_or_finish() to warn if this flag is set and ignore it. Fixes: dd291d77cc90 ("block: Introduce zone write plugging") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Damien Le Moal <dlemoal@xxxxxxxxxx> --- block/blk-zoned.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/block/blk-zoned.c b/block/blk-zoned.c index 7982b9494d63..ee9c67121c6c 100644 --- a/block/blk-zoned.c +++ b/block/blk-zoned.c @@ -707,6 +707,15 @@ static bool blk_zone_wplug_handle_reset_or_finish(struct bio *bio, return true; } + /* + * No-wait reset or finish BIOs do not make much sense as the callers + * issue these as blocking operations in most cases. To avoid issues + * the BIO execution potentially failing with BLK_STS_AGAIN, warn about + * REQ_NOWAIT being set and ignore that flag. + */ + if (WARN_ON_ONCE(bio->bi_opf & REQ_NOWAIT)) + bio->bi_opf &= ~REQ_NOWAIT; + /* * If we have a zone write plug, set its write pointer offset to 0 * (reset case) or to the zone size (finish case). This will abort all -- 2.47.0