From: Christoph Hellwig <hch@lst.de>
Date: Wed, 2 Oct 2024 07:21:41 +0000 (+0200)
Subject: xfs: add a xfs_rtbno_is_group_start helper
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=refs%2Fheads%2Fxfs-group-geometry;p=users%2Fhch%2Fxfs.git

xfs: add a xfs_rtbno_is_group_start helper

Make the boundary condition flag more clear and implement it by
a single masking operation.

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

diff --git a/fs/xfs/libxfs/xfs_rtgroup.h b/fs/xfs/libxfs/xfs_rtgroup.h
index 246228ecd359..d3d471c985e8 100644
--- a/fs/xfs/libxfs/xfs_rtgroup.h
+++ b/fs/xfs/libxfs/xfs_rtgroup.h
@@ -196,6 +196,15 @@ xfs_rtb_to_rgbno(
 	return xfs_fsb_to_gbno(mp, rtbno, XG_TYPE_RTG);
 }
 
+/* Is rtbno the start of a RT group? */
+static inline bool
+xfs_rtbno_is_group_start(
+	struct xfs_mount	*mp,
+	xfs_rtblock_t		rtbno)
+{
+	return (rtbno & mp->m_groups[XG_TYPE_RTG].blkmask) == 0;
+}
+
 /*
  * Note: takes a uint64_t for bno because the rgbno component can be
  * > sizeof(xfs_rgblock_t) for legacy file systems.
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 8d60ca29db58..b74e16e44fd0 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -133,8 +133,7 @@ xfs_bmbt_to_iomap(
 		 * single RTG.
 		 */
 		if (XFS_IS_REALTIME_INODE(ip) && xfs_has_rtgroups(mp) &&
-		    xfs_rtb_to_rtx(mp, imap->br_startblock) == 0 &&
-		    xfs_rtb_to_rtxoff(mp, imap->br_startblock) == 0)
+		    xfs_rtbno_is_group_start(mp, imap->br_startblock))
 			iomap->flags |= IOMAP_F_BOUNDARY;
 	}
 	iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);