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dm cache: io destined for the cache device can now serve as tick bios

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Previously only origin bios could trigger ticks, which meant if all
the io was destined for the cache no ticks were generated.  If no ticks
are generated then multiple hits, and movements in general, are
attributed to the same tick.

Only a stop gap fix, we need a better solution.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Joe Thornber 2013-10-21 12:51:45 +01:00 committed by Mike Snitzer
parent 99ba2ae4cd
commit f8e5f01a32
1 changed files with 1 additions and 0 deletions
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1
drivers/md/dm-cache-target.c
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@ -605,6 +605,7 @@ static void remap_to_origin_clear_discard(struct cache *cache, struct bio *bio,
static void remap_to_cache_dirty(struct cache *cache, struct bio *bio,
dm_oblock_t oblock, dm_cblock_t cblock)
{
check_if_tick_bio_needed(cache, bio);
remap_to_cache(cache, bio, cblock);
if (bio_data_dir(bio) == WRITE) {
set_dirty(cache, oblock, cblock);