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Re: [PATCH 5/5] xfs: allow linkat() on O_TMPFILE files

To: Zhi Yong Wu <zwu.kernel@xxxxxxxxx>
Subject: Re: [PATCH 5/5] xfs: allow linkat() on O_TMPFILE files
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Fri, 13 Dec 2013 08:41:54 -0800
Cc: xfs@xxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1386944873-16796-6-git-send-email-zwu.kernel@xxxxxxxxx>
References: <1386944873-16796-1-git-send-email-zwu.kernel@xxxxxxxxx> <1386944873-16796-6-git-send-email-zwu.kernel@xxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Fri, Dec 13, 2013 at 10:27:53PM +0800, Zhi Yong Wu wrote:
> From: Zhi Yong Wu <wuzhy@xxxxxxxxxxxxxxxxxx>
> 
> Enable O_TMPFILE support in linkat().
> For more info, please refer to:
>   http://oss.sgi.com/archives/xfs/2013-08/msg00341.html

Generall you should provide all reasonable information in the changelog
instead of linking to it.

> +     if (sip->i_d.di_nlink == 0)
> +             tres = &M_RES(mp)->tr_link_tmpfile;
> +     else
> +             tres = &M_RES(mp)->tr_link;

As mentioned before I think Dave wanted you to always use the same
reservation, but I'll leave that discussion to him.

> +/* For creating a link to an O_TMPFILE inode, except modifying
> + * those metadata for regular inode, we still need to remove an inode
> + * from unlinked list at first. That is,  we can modify:
> + *    the agi hash list and counters: sector size
> + *    the on disk inode before ours in the agi hash list: inode cluster size
> + */

We always have an emptry content

/*

line at the beginning of comments in XFS and the Linux kernel in
general.

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