btrfs-progs: btrfs convert v2

btrfs-progs: btrfs convert v2

[Vytautas D]

Hi Qu, thanks for your work on btrfs convert.

Does your btrfs convert work ( namely
https://www.spinics.net/lists/linux-btrfs/msg49719.html patches )
change any caveats described here ->
https://btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3#Before_first_use

i.e. does larger than 1 gb files still needs defrag after which
rollback is not possible ?

Thanks,
Vytas

Re: btrfs-progs: btrfs convert v2

[Qu Wenruo]

Vytautas D wrote on 2016/03/03 15:33 +0000:
> Hi Qu, thanks for your work on btrfs convert.
>
> Does your btrfs convert work ( namely
> https://www.spinics.net/lists/linux-btrfs/msg49719.html patches )
> change any caveats described here ->
> https://btrfs.wiki.kernel.org/index.php/Conversion_from_Ext3#Before_first_use
>
NO caveats is changed.

The only visible change is, after convert, metadata are all in SINGLE 
profile other than DUP.

The rework is aimed to fix the chunk type mismatch problem.
(A lot of codes just for a workaround-able problem...)

> i.e. does larger than 1 gb files still needs defrag after which
> rollback is not possible ?

Not sure why 1GB files needs defrag.

I assume it's related to ext* block group size, the default size would 
be 128M for each block group, and since each block group will have 
metadata as its beginning, splitting large files into 120+M parts.

Thans,
Qu

>
> Thanks,
> Vytas
>
>