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dm: support REQ_OP_WRITE_ZEROES

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Copy & paste from the REQ_OP_WRITE_SAME code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Christoph Hellwig
2017-04-05 19:21:05 +02:00
committed by Jens Axboe
parent 0f5d690f7b
commit ac62d6208a
9 changed files with 83 additions and 8 deletions
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6
include/linux/device-mapper.h
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@@ -254,6 +254,12 @@ struct dm_target {
*/
unsigned num_write_same_bios;
/*
* The number of WRITE ZEROES bios that will be submitted to the target.
* The bio number can be accessed with dm_bio_get_target_bio_nr.
*/
unsigned num_write_zeroes_bios;
/*
* The minimum number of extra bytes allocated in each io for the
* target to use.