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

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Date:	Mon, 21 Jun 2010 12:21:52 -0600
From:	Andreas Dilger <adilger@...ger.ca>
To:	Amir Goldstein <amir73il@...rs.sf.net>
Cc:	"linux-ext4@...r.kernel.org development" <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2/8] e2fsprogs: Add big_journal feature for Next3

> 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.

Cheers, Andreas

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