block: Introduce bio_needs_zone_write_plugging()

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In preparation for fixing device mapper zone write handling, introduce
the inline helper function bio_needs_zone_write_plugging() to test if a
BIO requires handling through zone write plugging using the function
blk_zone_plug_bio(). This function returns true for any write
(op_is_write(bio) == true) operation directed at a zoned block device
using zone write plugging, that is, a block device with a disk that has
a zone write plug hash table.

This helper allows simplifying the check on entry to blk_zone_plug_bio()
and used in to protect calls to it for blk-mq devices and DM devices.

Fixes: f211268ed1 ("dm: Use the block layer zone append emulation")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250625093327.548866-3-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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This commit is contained in:

Damien Le Moal 2025-06-25 18:33:24 +09:00 • committed by Jens Axboe

parent 3f66ccbaae

commit f70291411b

4 changed files with 63 additions and 22 deletions

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6

block/blk-mq.c

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20

block/blk-zoned.c

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4

drivers/md/dm.c

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55

include/linux/blkdev.h

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