[PATCH 04/21] xfs: add xfs_daddr_to_rgno and xfs_daddr_to_rgbno helpers

[Christoph Hellwig <hch@lst.de>]

Translate from a disk address to the realtime group and group-relative
block numbers.  This will be needed by the data checksumming code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_rtgroup.h | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_rtgroup.h b/fs/xfs/libxfs/xfs_rtgroup.h
index fca2eb74908c..f26e324f0de3 100644
--- a/fs/xfs/libxfs/xfs_rtgroup.h
+++ b/fs/xfs/libxfs/xfs_rtgroup.h
@@ -390,4 +390,24 @@ xfs_rtgroup_raw_size(
 	return g->blocks;
 }
 
+static inline xfs_rgnumber_t
+xfs_daddr_to_rgno(struct xfs_mount *mp, xfs_daddr_t d)
+{
+	struct xfs_groups	*g = &mp->m_groups[XG_TYPE_RTG];
+	xfs_rfsblock_t		rbno = XFS_BB_TO_FSBT(mp, d) - g->start_fsb;
+
+	ASSERT(xfs_has_rtgroups(mp));
+	return div_u64(rbno, xfs_rtgroup_raw_size(mp));
+}
+
+static inline xfs_rgblock_t
+xfs_daddr_to_rgbno(struct xfs_mount *mp, xfs_daddr_t d)
+{
+	struct xfs_groups	*g = &mp->m_groups[XG_TYPE_RTG];
+	xfs_rfsblock_t		rbno = XFS_BB_TO_FSBT(mp, d) - g->start_fsb;
+
+	ASSERT(xfs_has_rtgroups(mp));
+	return do_div(rbno, xfs_rtgroup_raw_size(mp));
+}
+
 #endif /* __LIBXFS_RTGROUP_H */
-- 
2.53.0