[PATCH v7 3/5] xfs: Add pquotaino to on-disk super block

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Add a new field to the superblock to add support for seperate pquota
with a specific version.

Define a macro to identify superblock with the new pquotino.

Keep backward compatibilty by allowing mount of older superblock
with no separate pquota inode.

Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
 fs/xfs/xfs_itable.c            |    3 +-
 fs/xfs/xfs_mount.c             |  120 ++++++++++++++++++++++++++++++----------
 fs/xfs/xfs_qm.c                |   22 ++++---
 fs/xfs/xfs_qm_syscalls.c       |   32 ++++++++--
 fs/xfs/xfs_quota.h             |    8 ---
 fs/xfs/xfs_sb.h                |   20 +++++-
 fs/xfs/xfs_super.c             |   14 +++--
 fs/xfs/xfs_trans_dquot.c       |    4 +-
 include/uapi/linux/dqblk_xfs.h |    1 +
 9 files changed, 158 insertions(+), 66 deletions(-)

diff --git a/fs/xfs/xfs_itable.c b/fs/xfs/xfs_itable.c
index 2ea7d40..d80d58c 100644
--- a/fs/xfs/xfs_itable.c
+++ b/fs/xfs/xfs_itable.c
@@ -43,7 +43,8 @@ xfs_internal_inum(
 {
 	return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
 		(xfs_sb_version_hasquota(&mp->m_sb) &&
-		 (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
+		 (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino ||
+		  ino == mp->m_sb.sb_pquotino)));
 }
 
 /*
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index e779276..334954f 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -109,6 +109,7 @@ static const struct {
     { offsetof(xfs_sb_t, sb_logsunit),	 0 },
     { offsetof(xfs_sb_t, sb_features2),	 0 },
     { offsetof(xfs_sb_t, sb_bad_features2), 0 },
+    { offsetof(xfs_sb_t, sb_pquotino),	 0 },
     { sizeof(xfs_sb_t),			 0 }
 };
 
@@ -548,21 +549,6 @@ xfs_sb_from_disk(
 	to->sb_uquotino = be64_to_cpu(from->sb_uquotino);
 	to->sb_gquotino = be64_to_cpu(from->sb_gquotino);
 	to->sb_qflags = be16_to_cpu(from->sb_qflags);
-	if ((to->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) &&
-			(to->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
-				XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))) {
-		xfs_notice(NULL, "Super block has XFS_OQUOTA bits along with "
-		    "XFS_PQUOTA and/or XFS_GQUOTA bits. Quota check forced.\n");
-		force_quota_check = true;
-	}
-	if (to->sb_qflags & XFS_OQUOTA_ENFD)
-		to->sb_qflags |= (to->sb_qflags & XFS_PQUOTA_ACCT) ?
-					XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
-	if (to->sb_qflags & XFS_OQUOTA_CHKD)
-		to->sb_qflags |= (to->sb_qflags & XFS_PQUOTA_ACCT) ?
-					XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
-	to->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
-
 	to->sb_flags = from->sb_flags;
 	to->sb_shared_vn = from->sb_shared_vn;
 	to->sb_inoalignmt = be32_to_cpu(from->sb_inoalignmt);
@@ -575,6 +561,44 @@ xfs_sb_from_disk(
 	to->sb_features2 = be32_to_cpu(from->sb_features2);
 	to->sb_bad_features2 = be32_to_cpu(from->sb_bad_features2);
 
+	if (xfs_sb_version_has_pquota(to)) {
+		if (to->sb_qflags & (XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD)) {
+			xfs_notice(NULL, "Super block has XFS_OQUOTA bits "
+			"with version PQUOTINO. Quota check forced.\n");
+			to->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
+			force_quota_check = true;
+		}
+		to->sb_pquotino = be64_to_cpu(from->sb_pquotino);
+	} else {
+		if (to->sb_qflags & (XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
+					XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD)) {
+			xfs_notice(NULL, "Super block has XFS_[G|P]UOTA "
+				"bits in version older than PQUOTINO. "
+				"Quota check forced.\n");
+
+			to->sb_qflags &= ~(XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD |
+					XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD);
+			force_quota_check = true;
+		}
+
+		/*
+		 * On disk superblock qflags uses XFS_OQUOTA.* to support
+		 * either PQUOTA or GQUOTA. But, in memory qflags uses
+		 * XFS_PQUOTA.* or XFS_GQUOTA.* depending on which quota
+		 * is used.
+		 * Following block translates XFS_OQUOTA.* to either
+		 * GQUOTA or PQUOTA.
+		 */
+		if (to->sb_qflags & XFS_OQUOTA_ENFD)
+			to->sb_qflags |= (to->sb_qflags & XFS_PQUOTA_ACCT) ?
+					XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;
+		if (to->sb_qflags & XFS_OQUOTA_CHKD)
+			to->sb_qflags |= (to->sb_qflags & XFS_PQUOTA_ACCT) ?
+					XFS_PQUOTA_CHKD : XFS_GQUOTA_CHKD;
+		to->sb_qflags &= ~(XFS_OQUOTA_ENFD | XFS_OQUOTA_CHKD);
+
+	}
+
 	if (force_quota_check)
 		to->sb_qflags &= ~(XFS_GQUOTA_CHKD | XFS_PQUOTA_CHKD);
 }
@@ -596,27 +620,51 @@ xfs_sb_to_disk(
 	int		first;
 	int		size;
 	__uint16_t	qflags = from->sb_qflags;
+	xfs_ino_t	gquotino = from->sb_pquotino;
 
 	ASSERT(fields);
 	if (!fields)
 		return;
 
-	if (fields & XFS_SB_QFLAGS) {
+	if (!xfs_sb_version_has_pquota(from)) {
+		if (fields & XFS_SB_QFLAGS) {
+			/*
+			 * The in-core version of sb_qflags do not have
+			 * XFS_OQUOTA_* flags, whereas the on-disk version
+			 * does.  So, convert incore XFS_{PG}QUOTA_* flags
+			 * to on-disk XFS_OQUOTA_* flags.
+			 */
+			qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
+					XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
+
+			if (from->sb_qflags &
+					(XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
+				qflags |= XFS_OQUOTA_ENFD;
+			if (from->sb_qflags &
+					(XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
+				qflags |= XFS_OQUOTA_CHKD;
+		}
+
 		/*
-		 * The in-core version of sb_qflags do not have
-		 * XFS_OQUOTA_* flags, whereas the on-disk version
-		 * does. So, convert incore XFS_{PG}QUOTA_* flags
-		 * to on-disk XFS_OQUOTA_* flags.
+		 * On-disk version earlier than NO_OQUOTA doesn't have
+		 * sb_pquotino. so, we need to copy the value to gquotino.
 		 */
-		qflags &= ~(XFS_PQUOTA_ENFD | XFS_PQUOTA_CHKD |
-				XFS_GQUOTA_ENFD | XFS_GQUOTA_CHKD);
+		if (fields & XFS_SB_PQUOTINO) {
+			fields &= (__int64_t)~XFS_SB_PQUOTINO;
+			fields |= (__int64_t)XFS_SB_GQUOTINO;
+			gquotino = from->sb_pquotino;
+		}
 
-		if (from->sb_qflags &
-				(XFS_PQUOTA_ENFD | XFS_GQUOTA_ENFD))
-			qflags |= XFS_OQUOTA_ENFD;
-		if (from->sb_qflags &
-				(XFS_PQUOTA_CHKD | XFS_GQUOTA_CHKD))
-			qflags |= XFS_OQUOTA_CHKD;
+		/* If any quota inodes are written, write all quota inodes */
+		if (fields & (XFS_SB_GQUOTINO|XFS_SB_UQUOTINO))
+			fields |= (XFS_SB_UQUOTINO|XFS_SB_GQUOTINO);
+
+	} else {
+		/* If any quota inodes are written, write all quota inodes */
+		if (fields & (XFS_SB_UQUOTINO | XFS_SB_GQUOTINO
+							| XFS_SB_PQUOTINO))
+			fields |= (XFS_SB_UQUOTINO | XFS_SB_GQUOTINO
+							| XFS_SB_PQUOTINO);
 	}
 
 	while (fields) {
@@ -630,6 +678,8 @@ xfs_sb_to_disk(
 			memcpy(to_ptr + first, from_ptr + first, size);
 		} else if (f == XFS_SBS_QFLAGS) {
 			*(__be16 *)(to_ptr + first) = cpu_to_be16(qflags);
+		} else if (f == XFS_SBS_GQUOTINO) {
+			*(__be64 *)(to_ptr + first) = cpu_to_be64(gquotino);
 		} else {
 			switch (size) {
 			case 2:
@@ -764,6 +814,18 @@ reread:
 	 */
 	xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
 
+	if (!xfs_sb_version_has_pquota(&mp->m_sb) && XFS_IS_PQUOTA_ON(mp)) {
+		/*
+		 * On disk superblock only has sb_gquotino, and in memory
+		 * superblock has both sb_gquotino and sb_pquotino. But,
+		 * only one them is supported at any point of time.
+		 * So, if PQUOTA is set in disk supoerblock, copy over
+		 * sb_gquotino to sb_pquotino.
+		 */
+		mp->m_sb.sb_pquotino = mp->m_sb.sb_gquotino;
+		mp->m_sb.sb_gquotino = NULLFSINO;
+	}
+
 	/*
 	 * We must be able to do sector-sized and sector-aligned IO.
 	 */
diff --git a/fs/xfs/xfs_qm.c b/fs/xfs/xfs_qm.c
index 8df6ac7..262acdd 100644
--- a/fs/xfs/xfs_qm.c
+++ b/fs/xfs/xfs_qm.c
@@ -516,7 +516,8 @@ xfs_qm_need_dqattach(
 	if (!XFS_NOT_DQATTACHED(mp, ip))
 		return false;
 	if (ip->i_ino == mp->m_sb.sb_uquotino ||
-	    ip->i_ino == mp->m_sb.sb_gquotino)
+	    ip->i_ino == mp->m_sb.sb_gquotino ||
+	    ip->i_ino == mp->m_sb.sb_pquotino)
 		return false;
 	return true;
 }
@@ -651,6 +652,7 @@ xfs_qm_dqdetach(
 
 	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
 	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
+	ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_pquotino);
 	if (ip->i_udquot) {
 		xfs_qm_dqrele(ip->i_udquot);
 		ip->i_udquot = NULL;
@@ -845,22 +847,21 @@ xfs_qm_qino_alloc(
 	spin_lock(&mp->m_sb_lock);
 	if (flags & XFS_QMOPT_SBVERSION) {
 		ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
-		ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-				   XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
-		       (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-			XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
 
 		xfs_sb_version_addquota(&mp->m_sb);
 		mp->m_sb.sb_uquotino = NULLFSINO;
 		mp->m_sb.sb_gquotino = NULLFSINO;
+		mp->m_sb.sb_pquotino = NULLFSINO;
 
 		/* qflags will get updated _after_ quotacheck */
 		mp->m_sb.sb_qflags = 0;
 	}
 	if (flags & XFS_QMOPT_UQUOTA)
 		mp->m_sb.sb_uquotino = (*ip)->i_ino;
-	else
+	else if (flags & XFS_QMOPT_GQUOTA)
 		mp->m_sb.sb_gquotino = (*ip)->i_ino;
+	else
+		mp->m_sb.sb_pquotino = (*ip)->i_ino;
 	spin_unlock(&mp->m_sb_lock);
 	xfs_mod_sb(tp, sbfields);
 
@@ -1168,7 +1169,9 @@ xfs_qm_dqusage_adjust(
 	 * rootino must have its resources accounted for, not so with the quota
 	 * inodes.
 	 */
-	if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
+	if (ino == mp->m_sb.sb_uquotino ||
+	    ino == mp->m_sb.sb_gquotino ||
+	    ino == mp->m_sb.sb_pquotino) {
 		*res = BULKSTAT_RV_NOTHING;
 		return XFS_ERROR(EINVAL);
 	}
@@ -1459,8 +1462,7 @@ xfs_qm_init_quotainos(
 		}
 	} else {
 		flags |= XFS_QMOPT_SBVERSION;
-		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
-			    XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
+		sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_QFLAGS);
 	}
 
 	/*
@@ -1487,7 +1489,7 @@ xfs_qm_init_quotainos(
 	}
 	if (XFS_IS_PQUOTA_ON(mp) && pip == NULL) {
 		error = xfs_qm_qino_alloc(mp, &pip,
-					     sbflags | XFS_SB_GQUOTINO,
+					     sbflags | XFS_SB_PQUOTINO,
 					     flags | XFS_QMOPT_PQUOTA);
 		if (error)
 			goto error_rele;
diff --git a/fs/xfs/xfs_qm_syscalls.c b/fs/xfs/xfs_qm_syscalls.c
index 8934ea7..eb6b5bd 100644
--- a/fs/xfs/xfs_qm_syscalls.c
+++ b/fs/xfs/xfs_qm_syscalls.c
@@ -201,8 +201,7 @@ xfs_qm_scall_quotaoff(
 	/*
 	 * If quotas is completely disabled, close shop.
 	 */
-	if (((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET1) ||
-	    ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_SET2)) {
+	if ((flags & XFS_MOUNT_QUOTA_ALL) == XFS_MOUNT_QUOTA_ALL) {
 		mutex_unlock(&q->qi_quotaofflock);
 		xfs_qm_destroy_quotainfo(mp);
 		return (0);
@@ -297,8 +296,10 @@ xfs_qm_scall_trunc_qfiles(
 
 	if (flags & XFS_DQ_USER)
 		error = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_uquotino);
-	if (flags & (XFS_DQ_GROUP|XFS_DQ_PROJ))
+	if (flags & XFS_DQ_GROUP)
 		error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_gquotino);
+	if (flags & XFS_DQ_PROJ)
+		error2 = xfs_qm_scall_trunc_qfile(mp, mp->m_sb.sb_pquotino);
 
 	return error ? error : error2;
 }
@@ -412,17 +413,20 @@ xfs_qm_scall_getqstat(
 	struct fs_quota_stat	*out)
 {
 	struct xfs_quotainfo	*q = mp->m_quotainfo;
-	struct xfs_inode	*uip, *gip;
-	bool                    tempuqip, tempgqip;
+	struct xfs_inode	*uip = NULL;
+	struct xfs_inode	*gip = NULL;
+	struct xfs_inode	*pip = NULL;
+	bool                    tempuqip = false;
+	bool                    tempgqip = false;
+	bool                    temppqip = false;
 
-	uip = gip = NULL;
-	tempuqip = tempgqip = false;
 	memset(out, 0, sizeof(fs_quota_stat_t));
 
 	out->qs_version = FS_QSTAT_VERSION;
 	if (!xfs_sb_version_hasquota(&mp->m_sb)) {
 		out->qs_uquota.qfs_ino = NULLFSINO;
 		out->qs_gquota.qfs_ino = NULLFSINO;
+		out->qs_pquota.qfs_ino = NULLFSINO;
 		return (0);
 	}
 	out->qs_flags = (__uint16_t) xfs_qm_export_flags(mp->m_qflags &
@@ -431,10 +435,13 @@ xfs_qm_scall_getqstat(
 	out->qs_pad = 0;
 	out->qs_uquota.qfs_ino = mp->m_sb.sb_uquotino;
 	out->qs_gquota.qfs_ino = mp->m_sb.sb_gquotino;
+	if (&out->qs_gquota != &out->qs_pquota)
+		out->qs_pquota.qfs_ino = mp->m_sb.sb_pquotino;
 
 	if (q) {
 		uip = q->qi_uquotaip;
 		gip = q->qi_gquotaip;
+		pip = q->qi_pquotaip;
 	}
 	if (!uip && mp->m_sb.sb_uquotino != NULLFSINO) {
 		if (xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
@@ -446,6 +453,11 @@ xfs_qm_scall_getqstat(
 					0, 0, &gip) == 0)
 			tempgqip = true;
 	}
+	if (!pip && mp->m_sb.sb_pquotino != NULLFSINO) {
+		if (xfs_iget(mp, NULL, mp->m_sb.sb_pquotino,
+					0, 0, &pip) == 0)
+			temppqip = true;
+	}
 	if (uip) {
 		out->qs_uquota.qfs_nblks = uip->i_d.di_nblocks;
 		out->qs_uquota.qfs_nextents = uip->i_d.di_nextents;
@@ -458,6 +470,12 @@ xfs_qm_scall_getqstat(
 		if (tempgqip)
 			IRELE(gip);
 	}
+	if (pip) {
+		out->qs_pquota.qfs_nblks = pip->i_d.di_nblocks;
+		out->qs_pquota.qfs_nextents = pip->i_d.di_nextents;
+		if (temppqip)
+			IRELE(pip);
+	}
 	if (q) {
 		out->qs_incoredqs = q->qi_dquots;
 		out->qs_btimelimit = q->qi_btimelimit;
diff --git a/fs/xfs/xfs_quota.h b/fs/xfs/xfs_quota.h
index e4dda36..8eee36e 100644
--- a/fs/xfs/xfs_quota.h
+++ b/fs/xfs/xfs_quota.h
@@ -278,14 +278,6 @@ typedef struct xfs_qoff_logformat {
 	 (XFS_IS_PQUOTA_ON(mp) && \
 		(mp->m_sb.sb_qflags & XFS_PQUOTA_CHKD) == 0))
 
-#define XFS_MOUNT_QUOTA_SET1	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
-				 XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
-				 XFS_PQUOTA_ENFD|XFS_PQUOTA_CHKD)
-
-#define XFS_MOUNT_QUOTA_SET2	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
-				 XFS_UQUOTA_CHKD|XFS_GQUOTA_ACCT|\
-				 XFS_GQUOTA_ENFD|XFS_GQUOTA_CHKD)
-
 #define XFS_MOUNT_QUOTA_ALL	(XFS_UQUOTA_ACCT|XFS_UQUOTA_ENFD|\
 				 XFS_UQUOTA_CHKD|XFS_PQUOTA_ACCT|\
 				 XFS_PQUOTA_ENFD|XFS_PQUOTA_CHKD|\
diff --git a/fs/xfs/xfs_sb.h b/fs/xfs/xfs_sb.h
index bbf11b0..2b6e4c8 100644
--- a/fs/xfs/xfs_sb.h
+++ b/fs/xfs/xfs_sb.h
@@ -82,11 +82,15 @@ struct xfs_mount;
 #define XFS_SB_VERSION2_PARENTBIT	0x00000010	/* parent pointers */
 #define XFS_SB_VERSION2_PROJID32BIT	0x00000080	/* 32 bit project id */
 #define XFS_SB_VERSION2_CRCBIT		0x00000100	/* metadata CRCs */
+#define XFS_SB_VERSION2_PQUOTINO	0x00000200	/* Separate project  *
+							 * quota field added *
+							 * no OQUOTA anymore */
 
 #define	XFS_SB_VERSION2_OKREALFBITS	\
 	(XFS_SB_VERSION2_LAZYSBCOUNTBIT	| \
 	 XFS_SB_VERSION2_ATTR2BIT	| \
-	 XFS_SB_VERSION2_PROJID32BIT)
+	 XFS_SB_VERSION2_PROJID32BIT	| \
+	 XFS_SB_VERSION2_PQUOTINO)
 #define	XFS_SB_VERSION2_OKSASHFBITS	\
 	(0)
 #define XFS_SB_VERSION2_OKREALBITS	\
@@ -141,7 +145,6 @@ typedef struct xfs_sb {
 	 */
 	xfs_ino_t	sb_uquotino;	/* user quota inode */
 	xfs_ino_t	sb_gquotino;	/* group quota inode */
-#define sb_pquotino	sb_gquotino
 	__uint16_t	sb_qflags;	/* quota flags */
 	__uint8_t	sb_flags;	/* misc. flags */
 	__uint8_t	sb_shared_vn;	/* shared version number */
@@ -161,6 +164,7 @@ typedef struct xfs_sb {
 	 * it for anything else.
 	 */
 	__uint32_t	sb_bad_features2;
+	xfs_ino_t	sb_pquotino;	/* project quota inode */
 
 	/* must be padded to 64 bit alignment */
 } xfs_sb_t;
@@ -231,6 +235,7 @@ typedef struct xfs_dsb {
 	 * it for anything else.
 	 */
 	__be32	sb_bad_features2;
+	__be64		sb_pquotino;	/* project quota inode */
 
 	/* must be padded to 64 bit alignment */
 } xfs_dsb_t;
@@ -251,7 +256,7 @@ typedef enum {
 	XFS_SBS_GQUOTINO, XFS_SBS_QFLAGS, XFS_SBS_FLAGS, XFS_SBS_SHARED_VN,
 	XFS_SBS_INOALIGNMT, XFS_SBS_UNIT, XFS_SBS_WIDTH, XFS_SBS_DIRBLKLOG,
 	XFS_SBS_LOGSECTLOG, XFS_SBS_LOGSECTSIZE, XFS_SBS_LOGSUNIT,
-	XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2,
+	XFS_SBS_FEATURES2, XFS_SBS_BAD_FEATURES2, XFS_SBS_PQUOTINO,
 	XFS_SBS_FIELDCOUNT
 } xfs_sb_field_t;
 
@@ -277,6 +282,7 @@ typedef enum {
 #define XFS_SB_FDBLOCKS		XFS_SB_MVAL(FDBLOCKS)
 #define XFS_SB_FEATURES2	XFS_SB_MVAL(FEATURES2)
 #define XFS_SB_BAD_FEATURES2	XFS_SB_MVAL(BAD_FEATURES2)
+#define XFS_SB_PQUOTINO		XFS_SB_MVAL(PQUOTINO)
 #define	XFS_SB_NUM_BITS		((int)XFS_SBS_FIELDCOUNT)
 #define	XFS_SB_ALL_BITS		((1LL << XFS_SB_NUM_BITS) - 1)
 #define	XFS_SB_MOD_BITS		\
@@ -284,7 +290,7 @@ typedef enum {
 	 XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO | XFS_SB_GQUOTINO | \
 	 XFS_SB_QFLAGS | XFS_SB_SHARED_VN | XFS_SB_UNIT | XFS_SB_WIDTH | \
 	 XFS_SB_ICOUNT | XFS_SB_IFREE | XFS_SB_FDBLOCKS | XFS_SB_FEATURES2 | \
-	 XFS_SB_BAD_FEATURES2)
+	 XFS_SB_BAD_FEATURES2 | XFS_SB_PQUOTINO)
 
 
 /*
@@ -511,6 +517,12 @@ static inline int xfs_sb_version_hascrc(xfs_sb_t *sbp)
 		(sbp->sb_features2 & XFS_SB_VERSION2_CRCBIT));
 }
 
+static inline int xfs_sb_version_has_pquota(xfs_sb_t *sbp)
+{
+	return xfs_sb_version_hasmorebits(sbp) &&
+		(sbp->sb_features2 & XFS_SB_VERSION2_PQUOTINO);
+}
+
 /*
  * end of superblock version macros
  */
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 9f5e917..ff08605 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -420,12 +420,6 @@ xfs_parseargs(
 	}
 #endif
 
-	if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
-	    (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE))) {
-		xfs_warn(mp, "cannot mount with both project and group quota");
-		return EINVAL;
-	}
-
 	if ((dsunit && !dswidth) || (!dsunit && dswidth)) {
 		xfs_warn(mp, "sunit and swidth must be specified together");
 		return EINVAL;
@@ -1388,6 +1382,14 @@ xfs_finish_flags(
 		return XFS_ERROR(EROFS);
 	}
 
+	if ((mp->m_qflags & (XFS_GQUOTA_ACCT | XFS_GQUOTA_ACTIVE)) &&
+	    (mp->m_qflags & (XFS_PQUOTA_ACCT | XFS_PQUOTA_ACTIVE)) &&
+	    !xfs_sb_version_has_pquota(&mp->m_sb)) {
+		xfs_warn(mp, "Super block does not support "
+				 "project and group quota together");
+		return XFS_ERROR(EINVAL);
+	}
+
 	return 0;
 }
 
diff --git a/fs/xfs/xfs_trans_dquot.c b/fs/xfs/xfs_trans_dquot.c
index d2eaf9a..e2d4dce 100644
--- a/fs/xfs/xfs_trans_dquot.c
+++ b/fs/xfs/xfs_trans_dquot.c
@@ -157,7 +157,8 @@ xfs_trans_mod_dquot_byino(
 	if (!XFS_IS_QUOTA_RUNNING(mp) ||
 	    !XFS_IS_QUOTA_ON(mp) ||
 	    ip->i_ino == mp->m_sb.sb_uquotino ||
-	    ip->i_ino == mp->m_sb.sb_gquotino)
+	    ip->i_ino == mp->m_sb.sb_gquotino ||
+	    ip->i_ino == mp->m_sb.sb_pquotino)
 		return;
 
 	if (tp->t_dqinfo == NULL)
@@ -825,6 +826,7 @@ xfs_trans_reserve_quota_nblks(
 
 	ASSERT(ip->i_ino != mp->m_sb.sb_uquotino);
 	ASSERT(ip->i_ino != mp->m_sb.sb_gquotino);
+	ASSERT(ip->i_ino != mp->m_sb.sb_pquotino);
 
 	ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 	ASSERT((flags & ~(XFS_QMOPT_FORCE_RES | XFS_QMOPT_ENOSPC)) ==
diff --git a/include/uapi/linux/dqblk_xfs.h b/include/uapi/linux/dqblk_xfs.h
index 8655280..f17e3bb 100644
--- a/include/uapi/linux/dqblk_xfs.h
+++ b/include/uapi/linux/dqblk_xfs.h
@@ -155,6 +155,7 @@ typedef struct fs_quota_stat {
 	__s8		qs_pad;		/* unused */
 	fs_qfilestat_t	qs_uquota;	/* user quota storage information */
 	fs_qfilestat_t	qs_gquota;	/* group quota storage information */
+#define qs_pquota	qs_gquota
 	__u32		qs_incoredqs;	/* number of dquots incore */
 	__s32		qs_btimelimit;  /* limit for blks timer */	
 	__s32		qs_itimelimit;  /* limit for inodes timer */	
-- 
1.7.1

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