Linux-XFS Archive on lore.kernel.org
 help / color / Atom feed
From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: Dave Chinner <david@fromorbit.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 04/18] xfs: stop using q_core.d_flags in the quota code
Date: Wed, 1 Jul 2020 16:19:10 -0700
Message-ID: <20200701231910.GQ7625@magnolia> (raw)
In-Reply-To: <20200701225053.GA2005@dread.disaster.area>

On Thu, Jul 02, 2020 at 08:50:53AM +1000, Dave Chinner wrote:
> On Tue, Jun 30, 2020 at 08:42:16AM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <darrick.wong@oracle.com>
> > 
> > Use the incore dq_flags to figure out the dquot type.  This is the first
> > step towards removing xfs_disk_dquot from the incore dquot.
> > 
> > Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
> > ---
> >  fs/xfs/libxfs/xfs_quota_defs.h |    2 ++
> >  fs/xfs/scrub/quota.c           |    4 ----
> >  fs/xfs/xfs_dquot.c             |   33 +++++++++++++++++++++++++++++++--
> >  fs/xfs/xfs_dquot.h             |    2 ++
> >  fs/xfs/xfs_dquot_item.c        |    6 ++++--
> >  fs/xfs/xfs_qm.c                |    4 ++--
> >  fs/xfs/xfs_qm.h                |    2 +-
> >  fs/xfs/xfs_qm_syscalls.c       |    9 +++------
> >  8 files changed, 45 insertions(+), 17 deletions(-)
> > 
> > 
> > diff --git a/fs/xfs/libxfs/xfs_quota_defs.h b/fs/xfs/libxfs/xfs_quota_defs.h
> > index 56d9dd787e7b..459023b0a304 100644
> > --- a/fs/xfs/libxfs/xfs_quota_defs.h
> > +++ b/fs/xfs/libxfs/xfs_quota_defs.h
> > @@ -29,6 +29,8 @@ typedef uint16_t	xfs_qwarncnt_t;
> >  
> >  #define XFS_DQ_ALLTYPES		(XFS_DQ_USER|XFS_DQ_PROJ|XFS_DQ_GROUP)
> >  
> > +#define XFS_DQ_ONDISK		(XFS_DQ_ALLTYPES)
> 
> That's used as an on-disk flags mask. Perhaps XFS_DQF_ONDISK_MASK?

Well, based on Christoph's suggestions I broke the incore dquot flags
(XFS_DQ_*) apart from the ondisk dquot flags (XFS_DQFLAG_*).  Not sure
if that's really better, but at least the namespaces are separate now.

> > +
> >  #define XFS_DQ_FLAGS \
> >  	{ XFS_DQ_USER,		"USER" }, \
> >  	{ XFS_DQ_PROJ,		"PROJ" }, \
> > diff --git a/fs/xfs/scrub/quota.c b/fs/xfs/scrub/quota.c
> > index 905a34558361..710659d3fa28 100644
> > --- a/fs/xfs/scrub/quota.c
> > +++ b/fs/xfs/scrub/quota.c
> > @@ -108,10 +108,6 @@ xchk_quota_item(
> >  
> >  	sqi->last_id = id;
> >  
> > -	/* Did we get the dquot type we wanted? */
> > -	if (dqtype != (d->d_flags & XFS_DQ_ALLTYPES))
> > -		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
> > -
> >  	if (d->d_pad0 != cpu_to_be32(0) || d->d_pad != cpu_to_be16(0))
> >  		xchk_fblock_set_corrupt(sc, XFS_DATA_FORK, offset);
> >  
> > diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
> > index 46c8ca83c04d..59d1bce34a98 100644
> > --- a/fs/xfs/xfs_dquot.c
> > +++ b/fs/xfs/xfs_dquot.c
> > @@ -561,6 +561,16 @@ xfs_dquot_from_disk(
> >  	return 0;
> >  }
> >  
> > +/* Copy the in-core quota fields into the on-disk buffer. */
> > +void
> > +xfs_dquot_to_disk(
> > +	struct xfs_disk_dquot	*ddqp,
> > +	struct xfs_dquot	*dqp)
> > +{
> > +	memcpy(ddqp, &dqp->q_core, sizeof(struct xfs_disk_dquot));
> > +	ddqp->d_flags = dqp->dq_flags & XFS_DQ_ONDISK;
> > +}
> > +
> >  /* Allocate and initialize the dquot buffer for this in-core dquot. */
> >  static int
> >  xfs_qm_dqread_alloc(
> > @@ -1108,6 +1118,17 @@ xfs_qm_dqflush_done(
> >  	xfs_dqfunlock(dqp);
> >  }
> >  
> > +/* Check incore dquot for errors before we flush. */
> > +static xfs_failaddr_t
> > +xfs_qm_dqflush_check(
> > +	struct xfs_dquot	*dqp)
> > +{
> > +	if (hweight8(dqp->dq_flags & XFS_DQ_ALLTYPES) != 1)
> > +		return __this_address;
> 
> This only checks the low 8 bits in dq_flags, which is a 32 bit
> field. If we ever renumber the dq flags and the dquot types end up
> outside the LSB, this code will break.
> 
> I don't really see a need to micro-optimise the code so much it
> leaves landmines like this in the code...

Ok. Fixed.

--D

> Cheers,
> 
> Dave.
> -- 
> Dave Chinner
> david@fromorbit.com

  reply index

Thread overview: 94+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-30 15:41 [PATCH 00/18] xfs: remove xfs_disk_quot from incore dquot Darrick J. Wong
2020-06-30 15:41 ` [PATCH 01/18] xfs: clear XFS_DQ_FREEING if we can't lock the dquot buffer to flush Darrick J. Wong
2020-06-30 21:35   ` Allison Collins
2020-07-01  8:32   ` Chandan Babu R
2020-07-01  8:33   ` Christoph Hellwig
2020-07-01 22:42     ` Dave Chinner
2020-06-30 15:42 ` [PATCH 02/18] xfs: fix inode quota reservation checks Darrick J. Wong
2020-06-30 21:35   ` Allison Collins
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:34   ` Christoph Hellwig
2020-06-30 15:42 ` [PATCH 03/18] xfs: validate ondisk/incore dquot flags Darrick J. Wong
2020-06-30 21:35   ` Allison Collins
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:42   ` Christoph Hellwig
2020-07-01 18:25     ` Darrick J. Wong
2020-07-02  6:30       ` Christoph Hellwig
2020-07-02 15:13         ` Darrick J. Wong
2020-07-01 22:41   ` Dave Chinner
2020-07-01 23:16     ` Darrick J. Wong
2020-06-30 15:42 ` [PATCH 04/18] xfs: stop using q_core.d_flags in the quota code Darrick J. Wong
2020-07-01  8:34   ` Chandan Babu R
2020-07-01  8:47   ` Christoph Hellwig
2020-07-01 19:02     ` Darrick J. Wong
2020-07-01 20:15   ` Allison Collins
2020-07-01 22:50   ` Dave Chinner
2020-07-01 23:19     ` Darrick J. Wong [this message]
2020-07-01 23:44       ` Dave Chinner
2020-07-01 23:50         ` Darrick J. Wong
2020-07-03  0:58           ` Dave Chinner
2020-07-03 18:01             ` Darrick J. Wong
2020-06-30 15:42 ` [PATCH 05/18] xfs: stop using q_core.d_id " Darrick J. Wong
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:48   ` Christoph Hellwig
2020-07-01 20:16   ` Allison Collins
2020-06-30 15:42 ` [PATCH 06/18] xfs: use a per-resource struct for incore dquot data Darrick J. Wong
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:49   ` Christoph Hellwig
2020-07-01 20:16   ` Allison Collins
2020-06-30 15:42 ` [PATCH 07/18] xfs: stop using q_core limits in the quota code Darrick J. Wong
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:50   ` Christoph Hellwig
2020-07-01 20:16   ` Allison Collins
2020-07-01 23:01   ` Dave Chinner
2020-07-01 23:13     ` Darrick J. Wong
2020-07-01 23:33       ` Darrick J. Wong
2020-07-01 23:45         ` Dave Chinner
2020-06-30 15:42 ` [PATCH 08/18] xfs: stop using q_core counters " Darrick J. Wong
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:51   ` Christoph Hellwig
2020-07-01 23:20   ` Allison Collins
2020-06-30 15:42 ` [PATCH 09/18] xfs: stop using q_core warning " Darrick J. Wong
2020-07-01  8:33   ` Chandan Babu R
2020-07-01  8:51   ` Christoph Hellwig
2020-07-01 23:20   ` Allison Collins
2020-06-30 15:42 ` [PATCH 10/18] xfs: stop using q_core timers " Darrick J. Wong
2020-07-01  8:34   ` Chandan Babu R
2020-07-01  8:51   ` Christoph Hellwig
2020-07-01 23:20   ` Allison Collins
2020-06-30 15:43 ` [PATCH 11/18] xfs: remove qcore from incore dquots Darrick J. Wong
2020-07-01  8:34   ` Chandan Babu R
2020-07-01  8:52   ` Christoph Hellwig
2020-07-01 23:07   ` Dave Chinner
2020-07-01 23:14     ` Darrick J. Wong
2020-07-02  2:06   ` Allison Collins
2020-06-30 15:43 ` [PATCH 12/18] xfs: refactor default quota limits by resource Darrick J. Wong
2020-07-01  8:52   ` Chandan Babu R
2020-07-01  8:53   ` Christoph Hellwig
2020-07-01 23:30   ` Dave Chinner
2020-07-02  0:07     ` Darrick J. Wong
2020-07-02  2:06   ` Allison Collins
2020-06-30 15:43 ` [PATCH 13/18] xfs: remove unnecessary arguments from quota adjust functions Darrick J. Wong
2020-07-01  8:53   ` Christoph Hellwig
2020-07-01  8:58   ` Chandan Babu R
2020-07-02  2:06   ` Allison Collins
2020-06-30 15:43 ` [PATCH 14/18] xfs: refactor quota exceeded test Darrick J. Wong
2020-07-01  8:56   ` Christoph Hellwig
2020-07-01 17:51     ` Darrick J. Wong
2020-07-01 18:48       ` Eric Sandeen
2020-07-01 23:34       ` Dave Chinner
2020-07-01 10:19   ` Chandan Babu R
2020-07-02 18:57   ` Allison Collins
2020-06-30 15:43 ` [PATCH 15/18] xfs: refactor xfs_qm_scall_setqlim Darrick J. Wong
2020-07-01  8:56   ` Christoph Hellwig
2020-07-03  4:11   ` Allison Collins
2020-07-03 12:39   ` Chandan Babu R
2020-06-30 15:43 ` [PATCH 16/18] xfs: refactor xfs_trans_dqresv Darrick J. Wong
2020-07-03  4:11   ` Allison Collins
2020-07-03 13:00   ` Chandan Babu R
2020-06-30 15:43 ` [PATCH 17/18] xfs: refactor xfs_trans_apply_dquot_deltas Darrick J. Wong
2020-07-04 20:41   ` Allison Collins
2020-07-06 13:40   ` Chandan Babu R
2020-06-30 15:43 ` [PATCH 18/18] xfs: add more dquot tracepoints Darrick J. Wong
2020-07-04 20:41   ` Allison Collins
2020-07-06 13:42   ` Chandan Babu R

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200701231910.GQ7625@magnolia \
    --to=darrick.wong@oracle.com \
    --cc=david@fromorbit.com \
    --cc=linux-xfs@vger.kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-XFS Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-xfs/0 linux-xfs/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-xfs linux-xfs/ https://lore.kernel.org/linux-xfs \
		linux-xfs@vger.kernel.org
	public-inbox-index linux-xfs

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-xfs


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git