diff options
| author | Mikulas Patocka <mpatocka@redhat.com> | 2012-07-27 15:08:03 +0100 |
|---|---|---|
| committer | Alasdair G Kergon <agk@redhat.com> | 2012-07-27 15:08:03 +0100 |
| commit | 7acf0277cea0f2da89ffffcc9892bea23f618e63 (patch) | |
| tree | 5f5c77f9ab0750826691d53a027cdcd786771fbb /include/linux/device-mapper.h | |
| parent | 55f2b8bdb0c7387eb2dc645b9ecbe5d0faa6b54e (diff) | |
dm: introduce split_discard_requests
This patch introduces a new variable split_discard_requests. It can be
set by targets so that discard requests are split on max_io_len
boundaries.
When split_discard_requests is not set, discard requests are only split on
boundaries between targets, as was the case before this patch.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
Diffstat (limited to 'include/linux/device-mapper.h')
| -rw-r--r-- | include/linux/device-mapper.h | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index b19c1e189a68..8bdbbfce759a 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -218,6 +218,12 @@ struct dm_target { unsigned discards_supported:1; /* + * Set if the target required discard request to be split + * on max_io_len boundary. + */ + unsigned split_discard_requests:1; + + /* * Set if this target does not return zeroes on discarded blocks. */ unsigned discard_zeroes_data_unsupported:1; |