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dm: prepare to support WRITE SAME

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Allow targets to opt in to WRITE SAME support by setting
'num_write_same_requests' in the dm_target structure.

A dm device will only advertise WRITE SAME support if all its
targets and all its underlying devices support it.

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mike Snitzer 2012-12-21 20:23:36 +00:00 • committed by Alasdair G Kergon
parent 9c5091f2ee
commit d54eaa5a0f
2 changed files with 34 additions and 1 deletions
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5
include/linux/device-mapper.h
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@ -205,6 +205,11 @@ struct dm_target {
*/
unsigned num_discard_requests;
/*
* The number of WRITE SAME requests that will be submitted to the target.
*/
unsigned num_write_same_requests;
/* target specific data */
void *private;