On 05/24/2016 12:01 PM, Edward Shishkin wrote:
On 05/24/2016 10:50 AM, Georgios Tsalikis wrote:
> I suppose they are great for discovering corrupted files, but is
there any way we can use them to retrieve a good copy of corrupted files?
Hello,
Currently if checksum verification failed, then the file system
becomes readonly
with the suggestion (in kernel messages) to repair the partition with
fsck.
Ofc, it is not convenient, but better than nothing. More efficient way
is to support replicas, so
that every time when checksum verification failed, you upload
respective replica. It is not difficult
to implement. Just allocate/release replicas simultaneously with
conventional formatted blocks.
Pointers to replicas can be placed near the checksums (a new node42
format is needed).
The patches 3.18.6-reiser4-add-node41-support.patch and
reiser4progs-1.0.9-add-node41-support.patch
are a good example of how to add a new node format.
The cleanest option, however, would be to implement external mirrors in the
context of reiser4 logical volumes support, that I am currently working on.
So if you are patient, then wait for the announce of basic things (I
think this
summer, but not sure).
Thanks,
Edward.
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