xfs: report realtime block quota limits on realtime directories

On the data device, calling statvfs on a projinherit directory results
in the block and avail counts being curtailed to the project quota block
limits, if any are set.  Do the same for realtime files or directories,
only use the project quota rt block limits.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: Darrick J. Wong

fs/xfs/xfs_qm_bhv.c

@@ -19,18 +19,24 @@
 STATIC void
 xfs_fill_statvfs_from_dquot(
 	struct kstatfs		*statp,
+	struct xfs_inode	*ip,
 	struct xfs_dquot	*dqp)
 {
+	struct xfs_dquot_res	*blkres = &dqp->q_blk;
 	uint64_t		limit;
 
-	limit = dqp->q_blk.softlimit ?
-		dqp->q_blk.softlimit :
-		dqp->q_blk.hardlimit;
+	if (XFS_IS_REALTIME_MOUNT(ip->i_mount) &&
+	    (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME)))
+		blkres = &dqp->q_rtb;
+
+	limit = blkres->softlimit ?
+		blkres->softlimit :
+		blkres->hardlimit;
 	if (limit && statp->f_blocks > limit) {
 		statp->f_blocks = limit;
 		statp->f_bfree = statp->f_bavail =
-			(statp->f_blocks > dqp->q_blk.reserved) ?
-			 (statp->f_blocks - dqp->q_blk.reserved) : 0;
+			(statp->f_blocks > blkres->reserved) ?
+			 (statp->f_blocks - blkres->reserved) : 0;
 	}
 
 	limit = dqp->q_ino.softlimit ?
@@ -61,7 +67,7 @@ xfs_qm_statvfs(
 	struct xfs_dquot	*dqp;
 
 	if (!xfs_qm_dqget(mp, ip->i_projid, XFS_DQTYPE_PROJ, false, &dqp)) {
-		xfs_fill_statvfs_from_dquot(statp, dqp);
+		xfs_fill_statvfs_from_dquot(statp, ip, dqp);
 		xfs_qm_dqput(dqp);
 	}
 }

fs/xfs/xfs_super.c

@@ -877,12 +877,6 @@ xfs_fs_statfs(
 	ffree = statp->f_files - (icount - ifree);
 	statp->f_ffree = max_t(int64_t, ffree, 0);
 
-
-	if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
-	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
-			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
-		xfs_qm_statvfs(ip, statp);
-
 	if (XFS_IS_REALTIME_MOUNT(mp) &&
 	    (ip->i_diflags & (XFS_DIFLAG_RTINHERIT | XFS_DIFLAG_REALTIME))) {
 		s64	freertx;
@@ -893,6 +887,11 @@ xfs_fs_statfs(
 			xfs_rtbxlen_to_blen(mp, freertx);
 	}
 
+	if ((ip->i_diflags & XFS_DIFLAG_PROJINHERIT) &&
+	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
+			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
+		xfs_qm_statvfs(ip, statp);
+
 	return 0;
 }