linux-ext4 - Re: [PATCH 2.6.27.y 04/11] ext4: Add percpu dirty block accounting.

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Message-ID: <20100317005138.GC4874@thunk.org>
Date:	Tue, 16 Mar 2010 20:51:38 -0400
From:	tytso@....edu
To:	Andreas Dilger <adilger@....com>
Cc:	"K. V K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	ext4 development <linux-ext4@...r.kernel.org>
Subject: Re: [PATCH 2.6.27.y 04/11] ext4: Add percpu dirty block accounting.

On Tue, Mar 16, 2010 at 12:48:03PM -0600, Andreas Dilger wrote:
> 
> Just looking at this old patch, and noticed this is still the same
> in newer versions.
> 
> This should probably be either an ext4_error(), since it affects
> data correctness, even though it isn't an on-disk error, or at least
> an ext4_msg() so that it also prints the block device and uses the
> standard ext4 error format.

Yeah, we should convert it to use ext4_msg(); using ext4_error()
doesn't seem appropriate since that will mark the file system as
corrupted, which isn't the case if this isn't an on-disk error.  Maybe
a WARN_ON(1) is appropriate so that we get a stack trace and
kerneloops.org tracking?

> In the first patch (ext4-claim-err.diff) the access to the
> superblock for ext4_msg() is a bit of a hack, but I think it isn't
> terrible.

Agreed, this isn't bad.

> The second patch (ext4-error-cleanup.diff, to be used instead of the
> first one) is a bit more thorough cleanup that changes the callers
> to pass a struct super_block, and also removes some single-use stack
> variables in related code.

I haven't looked closely at this one yet, I'm not entirely convinced
the cleanups are worth all of the changes, but I'm willing to be
convinced.

					- Ted

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