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| author | Joe Thornber <ejt@redhat.com> | 2015-01-23 10:00:07 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-01-29 17:40:55 -0800 |
| commit | 5b39b457f9d9fda92ddbebf92d1bb94213ae1c5a (patch) | |
| tree | 4bb6e5fbd4e12510b7c5d638661d05917bd74e1d /kernel | |
| parent | 7f8e9beb905e75b5c2baeb0b88d6e417610634c3 (diff) | |
| download | lwn-5b39b457f9d9fda92ddbebf92d1bb94213ae1c5a.tar.gz lwn-5b39b457f9d9fda92ddbebf92d1bb94213ae1c5a.zip | |
dm cache: share cache-metadata object across inactive and active DM tables
commit 9b1cc9f251affdd27f29fe46d0989ba76c33faf6 upstream.
If a DM table is reloaded with an inactive table when the device is not
suspended (normal procedure for LVM2), then there will be two dm-bufio
objects that can diverge. This can lead to a situation where the
inactive table uses bufio to read metadata at the same time the active
table writes metadata -- resulting in the inactive table having stale
metadata buffers once it is promoted to the active table slot.
Fix this by using reference counting and a global list of cache metadata
objects to ensure there is only one metadata object per metadata device.
Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions