Re: Reiser4 inclusion into staging tree

[Edward Shishkin <edward.shishkin@gmail.com>]

On 11/02/2014 11:19 PM, Edward Shishkin wrote:
>
> On 11/02/2014 10:09 AM, Dušan Čolić wrote:
>> I've made a poll on forums.gentoo.org with a question:" What Reiser4
>> needs for you to start using it?" and with these offered answers I got
>> following results:
>>
>> http://forums.gentoo.org/viewtopic-t-1002726-postdays-0-postorder-asc-start-25.html 
>>
>>
>> Mainline inclusion
>>   45%
>> Encryption
>>   0%
>> Snapshots
>>   0%
>> Defrag
>>   0%
>> Performance
>>   0%
>> Subvolumes
>>   0%
>> Grub2 support
>>   0%
>> Something else
>>   31%
>> It's already perfect
>>   4%
>> I'd never use it
>>   18%
>>
>>
>> Something else were users that asked for checksums (we do that for
>> ccreg40 partitions or files?
>
>
> Currently a checksum (adler32) is appended at the end of compressed
> logical cluster. If cluster is not compressed for some reasons, then
> checksum is not appended.
>
> Also we protect bitmap blocks by checksums.
>
>
>>   what about reg40? just sizes AFAIK?),
>
>
> Data of files managed by unix-file plugin is not protected by checksums.
>
> I think that data protection by checksums is a business of applications
> (not of the file system).


Well, it makes sense, if we support mirroring at the file level.
If check is failed, then look at the respective extent in the file-replica.

Edward.


>
> It makes sense to protect formatted nodes of the storage tree.
> We'll need a new node format (node41, or so), which includes a 32-bit
> checksum, which is updated/checked at flush/jload time. If jload() finds
> that check is not OK, then make the file system read-only and suggest
> to fsck.
>
> Edward.
>
>
>>   SSD
>> support, fixing undeletable dir bug, long mount times (if the large
>> partition is / does dont_load_bitmap have to be in boot options or it
>> can be in /etc/fstab?)...
>>
>> Based on these results (even on a small portion of linux user base
>> that's traditionally been positive about reiser4) I really think that
>> taking Reiser4 to the staging tree could be the move that would show
>> users that the R4 development has some goal and is not dying down and
>> with that would come influx of new users/developers.
>>
>> Ofc this is just my wish as I don't have the knowlege or right to push
>> it to staging but if there's anything you can think of that I can do
>> to help (I have one extra machine just waiting for some R4 testing)
>> please tell me.
>>
>> Thanks a lot for your great work
>>
>> Dushan
>

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