linux-ext4 - Re: [PATCH 7/7] tune2fs: Update dir checksums when clearing dir

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Message-ID: <20200315171520.GT225435@mit.edu>
Date:   Sun, 15 Mar 2020 13:15:20 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 7/7] tune2fs: Update dir checksums when clearing
 dir_index feature

On Thu, Feb 13, 2020 at 11:16:02AM +0100, Jan Kara wrote:
> When clearing dir_index feature while metadata_csum is enabled, we have
> to rewrite checksums of all indexed directories to update checksums of
> internal tree nodes.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

With regards to the enum, I agree with Jan that using an enum for
bitfields isn't a great fit.  Also, in this case, where it's for a
static function and the definitions don't go beyond a single file, the
advantages of using an enum so we can have strong typing is much less
useful.

One thing which I did notice when trying to test this patch is that

mke2fs -t ext4 -d /usr/projects/e2fsprogs /tmp/foo.img 1G

...does not create any indexed directories.  That's because the
changes to ext2fs_link() only teach e2fsprogs how to add a link to a
directory which is already indexing.  We don't have code which takes a
directory with a single directory block and which doesn't have
directory indexing flag enabled, and converts to a indexed directory.

That might be a nice thing to add at some point.

     	      	     	      	     - Ted