[PATCH v2 2/3] fs/xfs: Add real-time device support to statfs

[Richard Wareing <rwareing@fb.com>]

- Reports real-time device free blocks in statfs calls if
inheritance bit is set on the inode of directory.  This is a bit more
intuitive, especially for use-cases which are using a much larger
device for the real-time device.

Signed-off-by: Richard Wareing <rwareing@fb.com>
---
 fs/xfs/xfs_super.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 4dbf95c..a1d6968 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1148,6 +1148,12 @@ xfs_fs_statfs(
 	    ((mp->m_qflags & (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))) ==
 			      (XFS_PQUOTA_ACCT|XFS_PQUOTA_ENFD))
 		xfs_qm_statvfs(ip, statp);
+	if ((ip->i_d.di_flags & XFS_DIFLAG_RTINHERIT) &&
+		(mp->m_rtdev_targp != NULL)) {
+		statp->f_blocks = sbp->sb_rblocks;
+		statp->f_bfree = sbp->sb_frextents * sbp->sb_rextsize -
+			mp->m_alloc_set_aside;
+	}
 	return 0;
 }
 
-- 
2.9.3