Re: ext3 support

[Abhirup Das <abhirup.das%hotmail.com@localhost>]

I see that there is some work done on ext3 and ext4, but only on read only mode. Why wasnt this merged into the kernel? Are you guys waiting on it to be complete ext3/ext4 support, as in with write support? And the project description there specifically mentioned journaling and since ext3 is backwards compatible, I would imagine ext3 in read only mode is the same thing as ext2 is it not? And I would still like to pursue the journaling option, I am guessing I have to dig through the FFS journaling extension to figure out how this works? Are there specific mentors I could talk to regarding the file system like the previous gsoc student had? 

Thanks. 

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From: tech-kern-owner%NetBSD.org@localhost <tech-kern-owner%NetBSD.org@localhost> on behalf of Christos Zoulas <christos%astron.com@localhost>
Sent: October 29, 2017 2:39:05 PM
To: tech-kern%netbsd.org@localhost
Subject: Re: ext3 support

 

In article <MWHPR13MB1390A54D6897C09BDC657AE0E25B0%MWHPR13MB1390.namprd13.prod.outlook.com@localhost>,
Abhirup Das  <abhirup.das%hotmail.com@localhost> wrote:
>Hi,
>
>I just came across the ext3 implementation project listed on the netbsd
>website, https://wiki.netbsd.org/projects/project/ext3fs/
>and I would like to take the time to implement this. But I am not too
>sure on how to start this project, I have read up on journaling and I
>understand the added work that journaling needs to perform.
>However I am sure ext3 needs more than just journaling, but I havent
>come across a specifications list for ext3 yet. Any advice on how to
>start this project would be greatly appreciated.

So this is a bit complicated issue. I am not sure if adding journaling
support is worth it (compared to the amount of time it will take to
implement it) because you can always mount the filesystem on linux,
recover from the journal and then use it on NetBSD. OTOH there has
been some ext3/ext4 work done as part of GSoC 2016...

https://summerofcode.withgoogle.com/archive/2016/projects/5183714946449408/

Finishing the RW support for it might be a more useful endeavor.

christos