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| author | Mikulas Patocka | 2017-03-17 17:40:51 +0100 |
|---|---|---|
| committer | Mike Snitzer | 2017-03-24 20:54:23 +0100 |
| commit | c2bcb2b702e4684e566d295d687228498184e0c4 (patch) | |
| tree | d68dcd1dff76ca211a50caac235c36d8f333c8d2 /Documentation/device-mapper | |
| parent | dm integrity: factor out create_journal() from dm_integrity_ctr() (diff) | |
| download | kernel-qcow2-linux-c2bcb2b702e4684e566d295d687228498184e0c4.tar.gz kernel-qcow2-linux-c2bcb2b702e4684e566d295d687228498184e0c4.tar.xz kernel-qcow2-linux-c2bcb2b702e4684e566d295d687228498184e0c4.zip | |
dm integrity: add recovery mode
In recovery mode, we don't:
- replay the journal
- check checksums
- allow writes to the device
This mode can be used as a last resort for data recovery. The
motivation for recovery mode is that when there is a single error in the
journal, the user should not lose access to the whole device.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'Documentation/device-mapper')
| -rw-r--r-- | Documentation/device-mapper/dm-integrity.txt | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/device-mapper/dm-integrity.txt b/Documentation/device-mapper/dm-integrity.txt index 2406f56501dc..9d9089f74206 100644 --- a/Documentation/device-mapper/dm-integrity.txt +++ b/Documentation/device-mapper/dm-integrity.txt @@ -59,6 +59,11 @@ Target arguments: either both data and tag or none of them are written. The journaled mode degrades write throughput twice because the data have to be written twice. + R - recovery mode - in this mode, journal is not replayed, + checksums are not checked and writes to the device are not + allowed. This mode is useful for data recovery if the + device cannot be activated in any of the other standard + modes. 5. the number of additional arguments |