linux-ext4 - Re: [PATCH 2/8] e2fsprogs: Add big

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Date:	Tue, 22 Jun 2010 12:06:38 +0300
From:	"Amir G." <amir73il@...rs.sourceforge.net>
To:	Andreas Dilger <adilger@...ger.ca>
Cc:	Amir Goldstein <amir73il@...rs.sf.net>,
	"linux-ext4@...r.kernel.org development" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/8] e2fsprogs: Add big_journal feature for Next3

On Mon, Jun 21, 2010 at 9:21 PM, Andreas Dilger <adilger@...ger.ca> wrote:
>> Next3 transactions reserve up to 24 times more credits than Ext3 transactions for the same operation.  On mke2fs and tune2fs, if the 'big_journal' feature is set along with the 'has_journal' feature, increase the default journal size by a factor of 24.
>
> It is already possible to specify an arbitrary journal size with "-J size={MB}", so there is no need to consume a feature flag just to hint what the journal size should be.
>
> It would be possible to check for some other snapshot-related feature flag, like "EXCLUDE_INODE" to determine if the journal is large enough for snapshotting, if it was deleted by e2fsck.  Otherwise, it is best to let the user specify the journal size they want.
>

Ted has already pointed out that a -J option would be more appropriate for this,
so I implemented the -J big option instead of the big_journal feature.

The differences between -J size={MB} and -J big, are:
1. -J big is more user friendly
2. -J big chooses a size which is the best fit for the file system size

BTW, those are not the most recent patches. the latest patch series is
available at:
http://sourceforge.net/projects/next3/files/Latest%20patch%20series

If you like, I can post the latest patches to the list.

Amir.
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