Re: [PATCH 09/13] xfs: remove direct calls to _qm_dqread

From: Brian Foster <bfoster@redhat.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-xfs@vger.kernel.org, hch@lst.de,
	Dave Chinner <david@fromorbit.com>
Subject: Re: [PATCH 09/13] xfs: remove direct calls to _qm_dqread
Date: Wed, 9 May 2018 12:40:22 -0400	[thread overview]
Message-ID: <20180509164022.GC66101@bfoster.bfoster> (raw)
In-Reply-To: <20180508000535.GZ11261@magnolia>

On Mon, May 07, 2018 at 05:05:35PM -0700, Darrick J. Wong wrote:
> From: Darrick J. Wong <darrick.wong@oracle.com>
> 
> The quota initialization code needs an "uncached" variant of _dqget to
> read in default quota limits and timers before the dquot cache is fully
> set up.  We've already split up _dqget into its component pieces so
> create a fourth variant to address this need, and make dqread internal
> to xfs_dquot.c again.
> 
> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> ---

Looks good to me:

Reviewed-by: Brian Foster <bfoster@redhat.com>

>  fs/xfs/xfs_dquot.c |   24 +++++++++++++++++++++++-
>  fs/xfs/xfs_dquot.h |    5 +++--
>  fs/xfs/xfs_qm.c    |   25 +++++++++++++------------
>  3 files changed, 39 insertions(+), 15 deletions(-)
> 
> diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
> index 54c16f76d12d..0cb4b553db28 100644
> --- a/fs/xfs/xfs_dquot.c
> +++ b/fs/xfs/xfs_dquot.c
> @@ -586,7 +586,7 @@ xfs_qm_dqread_alloc(
>   *
>   * If XFS_QMOPT_DQALLOC is set, allocate a dquot on disk if it needed.
>   */
> -int
> +static int
>  xfs_qm_dqread(
>  	struct xfs_mount	*mp,
>  	xfs_dqid_t		id,
> @@ -832,6 +832,28 @@ xfs_qm_dqget(
>  	return 0;
>  }
>  
> +/*
> + * Given a dquot id and type, read and initialize a dquot from the on-disk
> + * metadata.  This function is only for use during quota initialization so
> + * it ignores the dquot cache assuming that the dquot shrinker isn't set up.
> + * The caller is responsible for _qm_dqdestroy'ing the returned dquot.
> + */
> +int
> +xfs_qm_dqget_uncached(
> +	struct xfs_mount	*mp,
> +	xfs_dqid_t		id,
> +	uint			type,
> +	struct xfs_dquot	**dqpp)
> +{
> +	int			error;
> +
> +	error = xfs_qm_dqget_checks(mp, type);
> +	if (error)
> +		return error;
> +
> +	return xfs_qm_dqread(mp, id, type, 0, dqpp);
> +}
> +
>  /* Return the quota id for a given inode and type. */
>  xfs_dqid_t
>  xfs_qm_id_for_quotatype(
> diff --git a/fs/xfs/xfs_dquot.h b/fs/xfs/xfs_dquot.h
> index 8a5b30e952b0..38a42874a98c 100644
> --- a/fs/xfs/xfs_dquot.h
> +++ b/fs/xfs/xfs_dquot.h
> @@ -160,8 +160,6 @@ static inline bool xfs_dquot_lowsp(struct xfs_dquot *dqp)
>  #define XFS_QM_ISPDQ(dqp)	((dqp)->dq_flags & XFS_DQ_PROJ)
>  #define XFS_QM_ISGDQ(dqp)	((dqp)->dq_flags & XFS_DQ_GROUP)
>  
> -extern int		xfs_qm_dqread(struct xfs_mount *, xfs_dqid_t, uint,
> -					uint, struct xfs_dquot	**);
>  extern void		xfs_qm_dqdestroy(xfs_dquot_t *);
>  extern int		xfs_qm_dqflush(struct xfs_dquot *, struct xfs_buf **);
>  extern void		xfs_qm_dqunpin_wait(xfs_dquot_t *);
> @@ -179,6 +177,9 @@ extern int		xfs_qm_dqget_inode(struct xfs_inode *ip, uint type,
>  					struct xfs_dquot **dqpp);
>  extern int		xfs_qm_dqget_next(struct xfs_mount *mp, xfs_dqid_t id,
>  					uint type, struct xfs_dquot **dqpp);
> +extern int		xfs_qm_dqget_uncached(struct xfs_mount *mp,
> +					xfs_dqid_t id, uint type,
> +					struct xfs_dquot **dqpp);
>  extern void		xfs_qm_dqput(xfs_dquot_t *);
>  
>  extern void		xfs_dqlock2(struct xfs_dquot *, struct xfs_dquot *);
> diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
> index b9244b8983b3..ea06762aa6c1 100644
> --- a/fs/xfs/xfs_qm.c
> +++ b/fs/xfs/xfs_qm.c
> @@ -563,8 +563,7 @@ xfs_qm_set_defquota(
>  	struct xfs_def_quota    *defq;
>  	int			error;
>  
> -	error = xfs_qm_dqread(mp, 0, type, 0, &dqp);
> -
> +	error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
>  	if (!error) {
>  		xfs_disk_dquot_t        *ddqp = &dqp->q_core;
>  
> @@ -590,11 +589,12 @@ xfs_qm_set_defquota(
>   */
>  STATIC int
>  xfs_qm_init_quotainfo(
> -	xfs_mount_t	*mp)
> +	struct xfs_mount	*mp)
>  {
> -	xfs_quotainfo_t *qinf;
> -	int		error;
> -	xfs_dquot_t	*dqp;
> +	struct xfs_quotainfo	*qinf;
> +	struct xfs_dquot	*dqp;
> +	uint			type;
> +	int			error;
>  
>  	ASSERT(XFS_IS_QUOTA_RUNNING(mp));
>  
> @@ -637,12 +637,13 @@ xfs_qm_init_quotainfo(
>  	 * user/group/proj quota types, otherwise a default value is used.
>  	 * This should be split into different fields per quota type.
>  	 */
> -	error = xfs_qm_dqread(mp, 0,
> -			XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
> -			 (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
> -			  XFS_DQ_PROJ),
> -			0, &dqp);
> -
> +	if (XFS_IS_UQUOTA_RUNNING(mp))
> +		type = XFS_DQ_USER;
> +	else if (XFS_IS_GQUOTA_RUNNING(mp))
> +		type = XFS_DQ_GROUP;
> +	else
> +		type = XFS_DQ_PROJ;
> +	error = xfs_qm_dqget_uncached(mp, 0, type, &dqp);
>  	if (!error) {
>  		xfs_disk_dquot_t	*ddqp = &dqp->q_core;
>  
> --
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