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Re: [PATCH 1/5] xfs: remove ->write_super and stop maintaining ->s_dirt

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH 1/5] xfs: remove ->write_super and stop maintaining ->s_dirt
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Sun, 10 May 2009 12:37:39 -0500
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20090426140707.533370000@xxxxxxxxxxxxxxxxxxxxxx>
References: <20090426140305.113371000@xxxxxxxxxxxxxxxxxxxxxx> <20090426140707.533370000@xxxxxxxxxxxxxxxxxxxxxx>
User-agent: Thunderbird 2.0.0.21 (Macintosh/20090302)
Christoph Hellwig wrote:

> the write_super method is used for
> 
>  (1) writing back the superblock periodically from pdflush
>  (2) called just before ->sync_fs for data integerity syncs
>  (3) just before ->put_super
> 
> We don't need (1) because we have our own peridoc writeout through xfssyncd,
> we don't need (2) because xfs_fs_sync_fs performs a proper synchronous
> superblock writeout after all other data and metadata has been written out,
> and we don't need (3) because we synchronously write the superblock in
> ->put_super once the filesystem is fully shut down.
> 
> Also remove ->s_dirt tracking as it's only used to decide when too call
> ->write_super.
> 
> 
> Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Reviewed-by: Eric Sandeen <sandeen@xxxxxxxxxxx>

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