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block: Ignore REQ_NOWAIT for zone reset and zone finish operations

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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@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20241209122357.47838-3-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Damien Le Moal 2024-12-09 21:23:55 +09:00 committed by Jens Axboe
parent cae0056708
commit 5eb3317aa5
1 changed files with 9 additions and 0 deletions
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9
block/blk-zoned.c
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@ -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