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dm cache: metadata clear dirty bits on clean shutdown 

When writing the dirty bitset to the metadata device on a clean
shutdown, clear the dirty bits.  Previously they were left indicating
the cache was dirty. This led to confusion about whether there really
was dirty data in the cache or not.  (This was a harmless bug.)

Reported-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Joe Thornber 2013-03-20 17:21:27 +00:00 committed by Alasdair G Kergon
parent b978440b8d
commit 79ed9caffc
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-cache-metadata.c
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@ -979,7 +979,7 @@ static int __dirty(struct dm_cache_metadata *cmd, dm_cblock_t cblock, bool dirty
/* nothing to be done */
return 0;
value = pack_value(oblock, flags | (dirty ? M_DIRTY : 0));
value = pack_value(oblock, (flags & ~M_DIRTY) | (dirty ? M_DIRTY : 0));
__dm_bless_for_disk(&value);
r = dm_array_set_value(&cmd->info, cmd->root, from_cblock(cblock),