linux-ext4 - Re: [PATCH 03/22] ext4: Record the checksum algorithm in use in the superblock

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Date:	Mon, 5 Dec 2011 11:32:51 -0800
From:	"Darrick J. Wong" <djwong@...ibm.com>
To:	"Ted Ts'o" <tytso@....edu>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 03/22] ext4: Record the checksum algorithm in use in
	the superblock

On Mon, Dec 05, 2011 at 10:46:55AM -0500, Ted Ts'o wrote:
> On Mon, Nov 28, 2011 at 03:26:36PM -0800, Darrick J. Wong wrote:
> > Record the type of checksum algorithm we're using for metadata in the
> > superblock, in case we ever want/need to change the algorithm.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> 
> In general, it's useful to group changes to the on-disk file system
> separately from the other patches, so this should be grouped with the
> addition of s_csum_seed (aka c_uuid_csum) in patch #2, and all other
> patches that add metadata changes.  That way we can see easily what
> all of the metadata changes are, at the beginning of the patch, and
> make sure that what we have in the e2fsprogs patch set matches what we
> have in the ext4 patch set.

Ok, I'll reorganize the patches to put all the disk format changes into a
separate patch at the beginning of the set.

As for e2fsprogs, I think you already committed most of the disk format
changes.  I'll check the e2fsprogs set.

> Also, the change to actually *enable* a file system feature should be
> at the very end of the file system.  This makes life safer if at some
> point in the future we need to do a kernel bisect.  If we are
> advertising the present of some feature such in /sys/fs/ext4/features,
> that should also go at the very end of the patch set (again for
> obvious reasons), and it can be grouped with the patch which enables
> the feature being defined as being enabled in EXT4_FEATURE_*_SUPP.
> (This is really a comment about patch #2 in this series, but I forgot
> to mention it in my previous e-mail.)
> 
> A similar set of guidelines apply to patches for e2fsprogs as well.

Okay, I'll move the *_SUPP changes into a separate patch at the end of the
sets.

--D
> 
>   	      	 	    	     	     - Ted
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