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| author | Mike Snitzer <snitzer@redhat.com> | 2012-12-21 20:23:36 +0000 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-12-21 20:23:36 +0000 |
| commit | d54eaa5a0fde0a202e4e91f200f818edcef15bee (patch) | |
| tree | bb40893166dc8cd1d0f84c8087d021b66774a007 /include | |
| parent | 9c5091f2eeeffe5eca2ffe8a1bc28d312c8a5083 (diff) | |
| download | linux-d54eaa5a0fde0a202e4e91f200f818edcef15bee.tar.gz linux-d54eaa5a0fde0a202e4e91f200f818edcef15bee.tar.bz2 linux-d54eaa5a0fde0a202e4e91f200f818edcef15bee.zip | |
dm: prepare to support WRITE SAME
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/device-mapper.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 38d27a10aa5d..d1f6cd8486f2 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -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; |