linux-ext4 - Re: [PATCH 3/5] ext4: Implement project ID support for ext4 filesystem

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Message-ID: <20100311120623.GC4706@infradead.org>
Date:	Thu, 11 Mar 2010 07:06:23 -0500
From:	Christoph Hellwig <hch@...radead.org>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org
Subject: Re: [PATCH 3/5] ext4: Implement project ID support for ext4
	filesystem

On Thu, Mar 04, 2010 at 09:34:35PM +0300, Dmitry Monakhov wrote:
>   Project id is stored on disk inside xattr usually inside ibody.
>   Xattr is used only as a data storage, It has not user visible xattr
>   interface.
> 
> * User interface
>   Project id is accessible via generic xattr interface "system.project_id"
> 
> TODO: implement e2libfs support for project_id.

I think you'd be much better off storing it inide the inode core itself.
E.g. you could ue the never used fragment address in the ext2/3/4 disk
inode.

> +#ifdef CONFIG_QUOTA
> +	qid[PRJQUOTA] = new_prjid;
> +	ret = inode->i_sb->dq_op->transfer(inode, qid, 1 << PRJQUOTA);
> +	if (ret)
> +		return ret;
> +#endif

This needs to be updated to use dquot_transfer directly.

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