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dm cache: pass a new 'critical' flag to the policies when requesting writeback work

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We only allow non critical writeback if the origin is idle.  It is up
to the policy to decide what writeback work is critical.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber
2015-05-15 15:20:09 +01:00
committed by Mike Snitzer
parent 066dbaa386
commit 20f6814b94
5 changed files with 13 additions and 7 deletions
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3
drivers/md/dm-cache-target.c
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@@ -1787,6 +1787,7 @@ static void writeback_some_dirty_blocks(struct cache *cache)
dm_cblock_t cblock;
struct prealloc structs;
struct dm_bio_prison_cell *old_ocell;
bool busy = !iot_idle_for(&cache->origin_tracker, HZ);
memset(&structs, 0, sizeof(structs));
@@ -1794,7 +1795,7 @@ static void writeback_some_dirty_blocks(struct cache *cache)
if (prealloc_data_structs(cache, &structs))
break;
r = policy_writeback_work(cache->policy, &oblock, &cblock);
r = policy_writeback_work(cache->policy, &oblock, &cblock, busy);
if (r)
break;