Commit f8e5f01a authored Oct 21, 2013 by Joe Thornber Committed by Mike Snitzer Nov 09, 2013

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



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>

parent 99ba2ae4

drivers/md/dm-cache-target.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -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);