null_blk: Introduce fua attribute

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Add the fua configfs attribute and module parameter to allow
configuring if the device supports FUA or not. Using this attribute
has an effect on the null_blk device only if memory backing is enabled
together with a write cache (cache_size option).

This new attribute allows configuring a null_blk device with a write
cache but without FUA support. This is convenient to test the block
layer flush machinery.

Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Chaitanya Kulkarni <kch@nvidia.com>
Tested-by: Hans Holmberg <hans.holmberg@wdc.com>
Tested-by: Dennis Maisenbacher <dennis.maisenbacher@wdc.com>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Link: https://lore.kernel.org/r/20240408014128.205141-18-dlemoal@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>

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Damien Le Moal 2024-04-08 10:41:17 +09:00 • committed by Jens Axboe

parent 997a1f08b4

commit f4f84586c8

2 changed files with 11 additions and 2 deletions

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12

drivers/block/null_blk/main.c

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1

drivers/block/null_blk/null_blk.h

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