linux-kernel - Re: [PATCH] [BUGFIX] xfs: use doalloc flag in xfs_qm_dqattach

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Date:	Tue, 15 Nov 2011 14:23:14 -0600
From:	Ben Myers <bpm@....com>
To:	Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
Cc:	Alex Elder <aelder@....com>, Christoph Hellwig <hch@...radead.org>,
	yrl.pp-manager.tt@...achi.com, linux-kernel@...r.kernel.org,
	xfs@....sgi.com, xfs-masters@....sgi.com
Subject: Re: [PATCH] [BUGFIX] xfs: use doalloc flag in xfs_qm_dqattach_one()

On Thu, Nov 10, 2011 at 10:33:10AM +0900, Mitsuo Hayasaka wrote:
> The doalloc arg in xfs_qm_dqattach_one() is a flag that indicates
> whether a new area to handle quota information will be allocated
> if needed. Originally, it was passed to xfs_qm_dqget(), but has
> been removed by the following commit (probably by mistake):
> 
> 	commit 8e9b6e7fa4544ea8a0e030c8987b918509c8ff47
> 	Author: Christoph Hellwig <hch@....de>
> 	Date:   Sun Feb 8 21:51:42 2009 +0100
> 
> 	xfs: remove the unused XFS_QMOPT_DQLOCK flag
> 
> As the result, xfs_qm_dqget() called from xfs_qm_dqattach_one()
> never allocates the new area even if it is needed.
> 
> This patch gives the doalloc arg to xfs_qm_dqget() in
> xfs_qm_dqattach_one() to fix this problem.
> 
> Signed-off-by: Mitsuo Hayasaka <mitsuo.hayasaka.hu@...achi.com>
> Cc: Alex Elder <aelder@....com>
> Cc: Christoph Hellwig <hch@...radead.org>
> ---
> 
>  fs/xfs/xfs_qm.c |    3 ++-
>  1 files changed, 2 insertions(+), 1 deletions(-)
> 
> diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
> index 9a0aa76..95ba6dc 100644
> --- a/fs/xfs/xfs_qm.c
> +++ b/fs/xfs/xfs_qm.c
> @@ -674,7 +674,8 @@ xfs_qm_dqattach_one(
>  	 * disk and we didn't ask it to allocate;
>  	 * ESRCH if quotas got turned off suddenly.
>  	 */
> -	error = xfs_qm_dqget(ip->i_mount, ip, id, type, XFS_QMOPT_DOWARN, &dqp);
> +	error = xfs_qm_dqget(ip->i_mount, ip, id, type,
> +			     doalloc | XFS_QMOPT_DOWARN, &dqp);
>  	if (error)
>  		return error;
>  

Looks like the only caller of xfs_qm_dqattach_one with XFS_QMOPT_DOALLOC
possibly set is xfs_qm_dqattach_locked, which does so based upon its
argument 'flags'.  AFAICS the only caller of xfs_qm_dqattach_locked that
sets this flag is xfs_qm_vop_dqalloc, which is called by
xfs_ioctl_setattr, xfs_setattr_nonsize, xfs_create, and xfs_symlink.

xfs_ioctl_setattr|xfs_setattr_nonsize|xfs_create|xfs_symlink
  xfs_qm_vop_dqalloc
    xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC
      xfs_qm_dqattach_one

I tried a few things to see if I could hit a problem without the patch
but no luck.

Anyway... Looks good.

Reviewed-by: Ben Myers <bpm@....com>
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