Commit 7acf0277 authored by Mikulas Patocka's avatar Mikulas Patocka Committed by Alasdair G Kergon

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: default avatarMikulas Patocka <mpatocka@redhat.com>
Signed-off-by: default avatarAlasdair G Kergon <agk@redhat.com>
parent 55f2b8bd
......@@ -1215,7 +1215,10 @@ static int __clone_and_map_discard(struct clone_info *ci)
if (!ti->num_discard_requests)
return -EOPNOTSUPP;
len = min(ci->sector_count, max_io_len_target_boundary(ci->sector, ti));
if (!ti->split_discard_requests)
len = min(ci->sector_count, max_io_len_target_boundary(ci->sector, ti));
else
len = min(ci->sector_count, max_io_len(ci->sector, ti));
__issue_target_requests(ci, ti, ti->num_discard_requests, len);
......
......@@ -217,6 +217,12 @@ 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.
*/
......
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