Re: [PATCH] ext4 extent support

[Felix Zielcke]

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From: "JavierMartín" <address@hidden>
Sent: Saturday, July 05, 2008 8:09 PM
To: "The development of GRUB 2" <address@hidden>
Subject: Re: [PATCH] ext4 extent support

> I mean unimplemented in GRUB right now.

Ah yeah of course :)

> IIrc, flex_bg relaxes some of
> the rules governing the location of the metadata block groups or
> something like that, so that they can be placed in "arbitrary"
> locations.
> Uninit_bg allows yet-unused block groups and inode tables to be
> initalized on first use, and saves a lot of time in mkfs (because it
> doesn't have to write all the inode tables) and fsck (because there's
> no
> need to check unused block groups at all).

Yeah I read sth. about these ext4 features before I started to try it out.
But I thought extN on a small new created filesystem with no deleted files 
works like
inode/block 0 to x is used and x+1 to end is unused so it shouldn't make a 
difference with uninit_bg enabled or not
GRUB wouldn't get to these unused inodes/blocks
Seems like there's still much I could learn :)


Oh and by the way
http://tytso.livejournal.com/57492.html
The ext4 developer is now using ext4 as primary fs on his notebook
and he says it should be in a few weeks ready to be used for production data
So seems like not a bad Idea to think about ext4 support in GRUB :)
I only had problems with 2.6.25 Kernel. Since I switched from that one to 
2.6.26-rc7 ext4 worked fine
But I only use it in a VMware test system which isn't used much