p71924506
/
linux_old1
1
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

dm cache: only use overwrite optimisation for promotion when in writeback mode 

Overwrite causes the cache block and origin blocks to diverge, which
is only allowed in writeback mode.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Joe Thornber 2014-11-27 12:21:08 +00:00 committed by Mike Snitzer
parent 2bb812df63
commit f29a3147e2
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/md/dm-cache-target.c
View File

@ -1142,7 +1142,8 @@ static void issue_copy_or_discard(struct dm_cache_migration *mg)
avoid = is_discarded_oblock(cache, mg->new_oblock);
if (!avoid && bio_writes_complete_block(cache, bio)) {
if (writeback_mode(&cache->features) &&
!avoid && bio_writes_complete_block(cache, bio)) {
issue_overwrite(mg, bio);
return;
}