linux-ext4 - Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup [NEW Version]

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Date:	Fri, 18 Jul 2008 21:59:14 +0200
From:	Goswin von Brederlow <goswin-v-b@....de>
To:	"Jose R. Santos" <jrs@...ibm.com>
Cc:	Goswin von Brederlow <goswin-v-b@....de>,
	"Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 15/15][e2fsprogs] 64-bit mke2fs cleanup [NEW Version]

"Jose R. Santos" <jrs@...ibm.com> writes:

> On Fri, 18 Jul 2008 13:35:32 +0200
> Goswin von Brederlow <goswin-v-b@....de> wrote:
>
>> "Jose R. Santos" <jrs@...ibm.com> writes:
>> 
>> > Hi folks,
>> >
>> > I'm posting a new version of the 64-bit mke2fs patch since it was broken
>> > in many ways (many thanks to Goswin for having a look and pointing them
>> > out).  This one can actually handle large fs as runs until its time to
>> > allocate table (where it barfs due bitmap issues).  To make 64bit fs, I
>> > use the following command.
>> >
>> > mke2fs -T ext4dev -O64bit /dev/my_large_disk
>> 
>> Just like ext2/3 default to a 4k blocksize if it exceeds 2^32 1k
>> blocks shouldn't ext4 default to 64bit if it exceeds 2^32 4k blocks?
>
> Eventually, when the feature is stable enough, we can change the
> default in mke2fs.conf to include this feature for the ext4 fs_type.
> The problem of setting it only if the fs exceeds 2^32 blocks is that
> you will not be able to resize an fs from 32 to 64bit due to the block
> group descriptor size change.  Once the feature is stable, it should
> set as default regardless of the storage size.

Won't tune2fs be able to adjust the descriptor size? I thought all the
keeping compatibility with ext2/3 was so people could upgrade without
reformating. Or is that maxime broken with 64bit support?

MfG
        Goswin
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