[PATCH 0/3] include reservations in quota reporting

[PATCH 0/3] include reservations in quota reporting

[Christoph Hellwig]

This series makes sure quota reporting through quotactl, or in case of
project quotas, statfs includes quota reservation in addition to the
on-disk values.  This fixes xfstests 270, which has been failing on XFS
since it was added, and makes the Q_XQUOTASYNC quotactl command that
xfs_quota uses to flush delalloc space redundant.

Jan, the last patch touches common quota code, but it's only relevant
to XFS - I'd like to put it in through the XFS tree if possible.

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[PATCH 1/3] xfs: merge xfs_qm_export_dquot into xfs_qm_scall_getquota

[Christoph Hellwig]

[-- Attachment #1: xfs-quota-kill-xfs_qm_export_dquot --]
[-- Type: text/plain, Size: 5742 bytes --]

The is no good reason to have these two separate, and for the next change
I'd need the full struct xfs_dquot in xfs_qm_export_dquot, so better just
fold the code now instead of changing it around.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/xfs_qm_syscalls.c
===================================================================
--- xfs.orig/fs/xfs/xfs_qm_syscalls.c	2012-02-02 13:11:38.368396372 +0100
+++ xfs/fs/xfs/xfs_qm_syscalls.c	2012-02-02 13:17:04.139964850 +0100
@@ -47,9 +47,6 @@ STATIC int	xfs_qm_log_quotaoff_end(xfs_m
 					uint);
 STATIC uint	xfs_qm_export_flags(uint);
 STATIC uint	xfs_qm_export_qtype_flags(uint);
-STATIC void	xfs_qm_export_dquot(xfs_mount_t *, xfs_disk_dquot_t *,
-					fs_disk_quota_t *);
-
 
 /*
  * Turn off quota accounting and/or enforcement for all udquots and/or
@@ -635,42 +632,6 @@ xfs_qm_scall_setqlim(
 	return error;
 }
 
-int
-xfs_qm_scall_getquota(
-	xfs_mount_t	*mp,
-	xfs_dqid_t	id,
-	uint		type,
-	fs_disk_quota_t *out)
-{
-	xfs_dquot_t	*dqp;
-	int		error;
-
-	/*
-	 * Try to get the dquot. We don't want it allocated on disk, so
-	 * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
-	 * exist, we'll get ENOENT back.
-	 */
-	if ((error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp))) {
-		return (error);
-	}
-
-	/*
-	 * If everything's NULL, this dquot doesn't quite exist as far as
-	 * our utility programs are concerned.
-	 */
-	if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
-		xfs_qm_dqput(dqp);
-		return XFS_ERROR(ENOENT);
-	}
-	/*
-	 * Convert the disk dquot to the exportable format
-	 */
-	xfs_qm_export_dquot(mp, &dqp->q_core, out);
-	xfs_qm_dqput(dqp);
-	return (error ? XFS_ERROR(EFAULT) : 0);
-}
-
-
 STATIC int
 xfs_qm_log_quotaoff_end(
 	xfs_mount_t		*mp,
@@ -759,50 +720,66 @@ error0:
 }
 
 
-/*
- * Translate an internal style on-disk-dquot to the exportable format.
- * The main differences are that the counters/limits are all in Basic
- * Blocks (BBs) instead of the internal FSBs, and all on-disk data has
- * to be converted to the native endianness.
- */
-STATIC void
-xfs_qm_export_dquot(
-	xfs_mount_t		*mp,
-	xfs_disk_dquot_t	*src,
+int
+xfs_qm_scall_getquota(
+	struct xfs_mount	*mp,
+	xfs_dqid_t		id,
+	uint			type,
 	struct fs_disk_quota	*dst)
 {
+	struct xfs_dquot	*dqp;
+	int			error;
+
+	/*
+	 * Try to get the dquot. We don't want it allocated on disk, so
+	 * we aren't passing the XFS_QMOPT_DOALLOC flag. If it doesn't
+	 * exist, we'll get ENOENT back.
+	 */
+	error = xfs_qm_dqget(mp, NULL, id, type, 0, &dqp);
+	if (error)
+		return error;
+
+	/*
+	 * If everything's NULL, this dquot doesn't quite exist as far as
+	 * our utility programs are concerned.
+	 */
+	if (XFS_IS_DQUOT_UNINITIALIZED(dqp)) {
+		error = XFS_ERROR(ENOENT);
+		goto out_put;
+	}
+
 	memset(dst, 0, sizeof(*dst));
-	dst->d_version = FS_DQUOT_VERSION;  /* different from src->d_version */
-	dst->d_flags = xfs_qm_export_qtype_flags(src->d_flags);
-	dst->d_id = be32_to_cpu(src->d_id);
+	dst->d_version = FS_DQUOT_VERSION;
+	dst->d_flags = xfs_qm_export_qtype_flags(dqp->q_core.d_flags);
+	dst->d_id = be32_to_cpu(dqp->q_core.d_id);
 	dst->d_blk_hardlimit =
-		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_blk_hardlimit));
+		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_hardlimit));
 	dst->d_blk_softlimit =
-		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_blk_softlimit));
-	dst->d_ino_hardlimit = be64_to_cpu(src->d_ino_hardlimit);
-	dst->d_ino_softlimit = be64_to_cpu(src->d_ino_softlimit);
-	dst->d_bcount = XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_bcount));
-	dst->d_icount = be64_to_cpu(src->d_icount);
-	dst->d_btimer = be32_to_cpu(src->d_btimer);
-	dst->d_itimer = be32_to_cpu(src->d_itimer);
-	dst->d_iwarns = be16_to_cpu(src->d_iwarns);
-	dst->d_bwarns = be16_to_cpu(src->d_bwarns);
+		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
+	dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
+	dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
+	dst->d_bcount = XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_bcount));
+	dst->d_icount = be64_to_cpu(dqp->q_core.d_icount);
+	dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
+	dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
+	dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
+	dst->d_bwarns = be16_to_cpu(dqp->q_core.d_bwarns);
 	dst->d_rtb_hardlimit =
-		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtb_hardlimit));
+		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 	dst->d_rtb_softlimit =
-		XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtb_softlimit));
-	dst->d_rtbcount = XFS_FSB_TO_BB(mp, be64_to_cpu(src->d_rtbcount));
-	dst->d_rtbtimer = be32_to_cpu(src->d_rtbtimer);
-	dst->d_rtbwarns = be16_to_cpu(src->d_rtbwarns);
+		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
+	dst->d_rtbcount = XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtbcount));
+	dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
+	dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 
 	/*
 	 * Internally, we don't reset all the timers when quota enforcement
 	 * gets turned off. No need to confuse the user level code,
 	 * so return zeroes in that case.
 	 */
-	if ((!XFS_IS_UQUOTA_ENFORCED(mp) && src->d_flags == XFS_DQ_USER) ||
+	if ((!XFS_IS_UQUOTA_ENFORCED(mp) && dqp->q_core.d_flags == XFS_DQ_USER) ||
 	    (!XFS_IS_OQUOTA_ENFORCED(mp) &&
-			(src->d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {
+			(dqp->q_core.d_flags & (XFS_DQ_PROJ | XFS_DQ_GROUP)))) {
 		dst->d_btimer = 0;
 		dst->d_itimer = 0;
 		dst->d_rtbtimer = 0;
@@ -823,6 +800,9 @@ xfs_qm_export_dquot(
 		}
 	}
 #endif
+out_put:
+	xfs_qm_dqput(dqp);
+	return error;
 }
 
 STATIC uint

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[PATCH 2/3] xfs: include reservations in quota reporting

[Christoph Hellwig]

[-- Attachment #1: xfs-quota-report-delalloc-reservations --]
[-- Type: text/plain, Size: 3453 bytes --]

Report all quota usage including the currently pending reservations.  This
avoids the need to flush delalloc space before gathering quota information,
and matches quota enforcement, which already takes the reservations into
account.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/xfs/xfs_qm_bhv.c
===================================================================
--- xfs.orig/fs/xfs/xfs_qm_bhv.c	2012-02-02 15:06:42.624326140 +0100
+++ xfs/fs/xfs/xfs_qm_bhv.c	2012-02-02 15:06:43.077657017 +0100
@@ -40,28 +40,28 @@
 STATIC void
 xfs_fill_statvfs_from_dquot(
 	struct kstatfs		*statp,
-	xfs_disk_dquot_t	*dp)
+	struct xfs_dquot	*dqp)
 {
 	__uint64_t		limit;
 
-	limit = dp->d_blk_softlimit ?
-		be64_to_cpu(dp->d_blk_softlimit) :
-		be64_to_cpu(dp->d_blk_hardlimit);
+	limit = dqp->q_core.d_blk_softlimit ?
+		be64_to_cpu(dqp->q_core.d_blk_softlimit) :
+		be64_to_cpu(dqp->q_core.d_blk_hardlimit);
 	if (limit && statp->f_blocks > limit) {
 		statp->f_blocks = limit;
 		statp->f_bfree = statp->f_bavail =
-			(statp->f_blocks > be64_to_cpu(dp->d_bcount)) ?
-			 (statp->f_blocks - be64_to_cpu(dp->d_bcount)) : 0;
+			(statp->f_blocks > dqp->q_res_bcount) ?
+			 (statp->f_blocks - dqp->q_res_bcount) : 0;
 	}
 
-	limit = dp->d_ino_softlimit ?
-		be64_to_cpu(dp->d_ino_softlimit) :
-		be64_to_cpu(dp->d_ino_hardlimit);
+	limit = dqp->q_core.d_ino_softlimit ?
+		be64_to_cpu(dqp->q_core.d_ino_softlimit) :
+		be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 	if (limit && statp->f_files > limit) {
 		statp->f_files = limit;
 		statp->f_ffree =
-			(statp->f_files > be64_to_cpu(dp->d_icount)) ?
-			 (statp->f_ffree - be64_to_cpu(dp->d_icount)) : 0;
+			(statp->f_files > dqp->q_res_icount) ?
+			 (statp->f_ffree - dqp->q_res_icount) : 0;
 	}
 }
 
@@ -82,7 +82,7 @@ xfs_qm_statvfs(
 	xfs_dquot_t		*dqp;
 
 	if (!xfs_qm_dqget(mp, NULL, xfs_get_projid(ip), XFS_DQ_PROJ, 0, &dqp)) {
-		xfs_fill_statvfs_from_dquot(statp, &dqp->q_core);
+		xfs_fill_statvfs_from_dquot(statp, dqp);
 		xfs_qm_dqput(dqp);
 	}
 }
Index: xfs/fs/xfs/xfs_qm_syscalls.c
===================================================================
--- xfs.orig/fs/xfs/xfs_qm_syscalls.c	2012-02-02 15:06:42.837658317 +0100
+++ xfs/fs/xfs/xfs_qm_syscalls.c	2012-02-02 15:07:31.894059224 +0100
@@ -758,8 +758,8 @@ xfs_qm_scall_getquota(
 		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_blk_softlimit));
 	dst->d_ino_hardlimit = be64_to_cpu(dqp->q_core.d_ino_hardlimit);
 	dst->d_ino_softlimit = be64_to_cpu(dqp->q_core.d_ino_softlimit);
-	dst->d_bcount = XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_bcount));
-	dst->d_icount = be64_to_cpu(dqp->q_core.d_icount);
+	dst->d_bcount = XFS_FSB_TO_BB(mp, dqp->q_res_bcount);
+	dst->d_icount = dqp->q_res_icount;
 	dst->d_btimer = be32_to_cpu(dqp->q_core.d_btimer);
 	dst->d_itimer = be32_to_cpu(dqp->q_core.d_itimer);
 	dst->d_iwarns = be16_to_cpu(dqp->q_core.d_iwarns);
@@ -768,7 +768,7 @@ xfs_qm_scall_getquota(
 		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_hardlimit));
 	dst->d_rtb_softlimit =
 		XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtb_softlimit));
-	dst->d_rtbcount = XFS_FSB_TO_BB(mp, be64_to_cpu(dqp->q_core.d_rtbcount));
+	dst->d_rtbcount = XFS_FSB_TO_BB(mp, dqp->q_res_rtbcount);
 	dst->d_rtbtimer = be32_to_cpu(dqp->q_core.d_rtbtimer);
 	dst->d_rtbwarns = be16_to_cpu(dqp->q_core.d_rtbwarns);
 

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[PATCH 3/3] quota: make Q_XQUOTASYNC a noop

[Christoph Hellwig]

[-- Attachment #1: quota-disable-Q_XQUOTASYNC --]
[-- Type: text/plain, Size: 1023 bytes --]

Now that XFS takes quota reservations into account there is no need to flush
anything before reporting quotas - in addition to beeing fully transactional
all quota information is also 100% coherent with the rest of the filesystem
now.

Signed-off-by: Christoph Hellwig <hch@lst.de>

Index: xfs/fs/quota/quota.c
===================================================================
--- xfs.orig/fs/quota/quota.c	2012-02-02 13:06:30.693396524 +0100
+++ xfs/fs/quota/quota.c	2012-02-02 13:23:23.181244741 +0100
@@ -282,10 +282,9 @@ static int do_quotactl(struct super_bloc
 	case Q_XGETQUOTA:
 		return quota_getxquota(sb, type, id, addr);
 	case Q_XQUOTASYNC:
-		/* caller already holds s_umount */
 		if (sb->s_flags & MS_RDONLY)
 			return -EROFS;
-		writeback_inodes_sb(sb, WB_REASON_SYNC);
+		/* XFS quotas are fully coherent now, making this call a noop */
 		return 0;
 	default:
 		return -EINVAL;

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Re: [PATCH 3/3] quota: make Q_XQUOTASYNC a noop

[Jan Kara]

On Thu 02-02-12 11:14:12, Christoph Hellwig wrote:
> Now that XFS takes quota reservations into account there is no need to flush
> anything before reporting quotas - in addition to beeing fully transactional
> all quota information is also 100% coherent with the rest of the filesystem
> now.
  Looks fine. You can add:
Acked-by: Jan Kara <jack@suse.cz>

								Honza
> Signed-off-by: Christoph Hellwig <hch@lst.de>
> 
> Index: xfs/fs/quota/quota.c
> ===================================================================
> --- xfs.orig/fs/quota/quota.c	2012-02-02 13:06:30.693396524 +0100
> +++ xfs/fs/quota/quota.c	2012-02-02 13:23:23.181244741 +0100
> @@ -282,10 +282,9 @@ static int do_quotactl(struct super_bloc
>  	case Q_XGETQUOTA:
>  		return quota_getxquota(sb, type, id, addr);
>  	case Q_XQUOTASYNC:
> -		/* caller already holds s_umount */
>  		if (sb->s_flags & MS_RDONLY)
>  			return -EROFS;
> -		writeback_inodes_sb(sb, WB_REASON_SYNC);
> +		/* XFS quotas are fully coherent now, making this call a noop */
>  		return 0;
>  	default:
>  		return -EINVAL;
> 
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR

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Re: [PATCH 0/3] include reservations in quota reporting

[Jan Kara]

On Thu 02-02-12 11:14:09, Christoph Hellwig wrote:
> This series makes sure quota reporting through quotactl, or in case of
> project quotas, statfs includes quota reservation in addition to the
> on-disk values.  This fixes xfstests 270, which has been failing on XFS
> since it was added, and makes the Q_XQUOTASYNC quotactl command that
> xfs_quota uses to flush delalloc space redundant.
> 
> Jan, the last patch touches common quota code, but it's only relevant
> to XFS - I'd like to put it in through the XFS tree if possible.
  Sure. The patch is trivial so conflicts are unlikely.

								Honza
-- 
Jan Kara <jack@suse.cz>
SUSE Labs, CR

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