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05 April 2024, 19:05:47 UTC
Revision 3201ac452e84a8a368197d648c9b7011e061804a authored by Joe Thornber on 22 October 2015, 17:10:55 UTC, committed by Mike Snitzer on 23 October 2015, 18:02:56 UTC 
dm cache: the CLEAN_SHUTDOWN flag was not being set
 
If the CLEAN_SHUTDOWN flag is not set when a cache is loaded then all cache
blocks are marked as dirty and a full writeback occurs.

__commit_transaction() is responsible for setting/clearing
CLEAN_SHUTDOWN (based the flags_mutator that is passed in).

Fix this issue, of the cache's on-disk flags being wrong, by making sure
__commit_transaction() does not reset the flags after the mutator has
altered the flags in preparation for them being serialized to disk.

before:

sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);
disk_super->flags = cpu_to_le32(cmd->flags);

after:

disk_super->flags = cpu_to_le32(cmd->flags);
sb_flags = mutator(le32_to_cpu(disk_super->flags));
disk_super->flags = cpu_to_le32(sb_flags);

Reported-by: Bogdan Vasiliev <bogdan.vasiliev@gmail.com>
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
1 parent 4dcb8b5
History
Tip revision: 3201ac452e84a8a368197d648c9b7011e061804a authored by Joe Thornber on 22 October 2015, 17:10:55 UTC
dm cache: the CLEAN_SHUTDOWN flag was not being set
Tip revision: 3201ac4
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