linux-ext4 - Re: Convert between journal features and strings

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Message-ID: <20080314204128.GD13733@mit.edu>
Date:	Fri, 14 Mar 2008 16:41:28 -0400
From:	Theodore Tso <tytso@....edu>
To:	Girish Shilamkar <Girish.Shilamkar@....COM>
Cc:	Ext4 Mailing List <linux-ext4@...r.kernel.org>
Subject: Re: Convert between journal features and strings

On Fri, Mar 14, 2008 at 11:59:29PM +0530, Girish Shilamkar wrote:
> Hi Ted,
> 	e2p_string2feature() and e2p_feature2string() can operate on ext2/3/4
> features list as there is only one struct feature feature_list[] and no
> corresponding journal features list. 
> After introducing journal_checksum and journal_async_commit features, we
> needed to display the features using debugfs which does it through the
> two e2p_* functions. A new struct feature jrnl_feature_list[] was added.
> The e2p_* functions were passed an additional argument so it can decide
> which feature list to use.
> Change in the APIs of e2p_* functions might not be acceptable so we have
> an option to either make e2p_feature2string2() function or add
> a new e2p_jnl_feature2string()
> 
> Would like to know what will be preferred e2p_feature2string2() or
> e2p_jnl_feature2string() ?

Two new functions are definitely preferable to changing the ABI's of
two existing functions.

Regards,

					- Ted
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