[33/52] xfs: create helpers to deal with rounding xfs_filblks_t to rtx boundaries

Commit Message

Darrick J. Wong Dec. 23, 2024, 10:06 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Source kernel commit: 3f0205ebe71f92c1b98ca580de8df6eea631cfd2

We're about to segment xfs_rtblock_t addresses, so we must create
type-specific helpers to do rt extent rounding of file mapping block
lengths because the rtb helpers soon will not do the right thing there.

Signed-off-by: Darrick J. Wong <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 libxfs/xfs_rtbitmap.c |    2 +-
 libxfs/xfs_rtbitmap.h |   30 +++++++++++++++++++++---------
 2 files changed, 22 insertions(+), 10 deletions(-)

Patch

diff --git a/libxfs/xfs_rtbitmap.c b/libxfs/xfs_rtbitmap.c
index 44c801f31d5dc3..e304f07189d3c9 100644
--- a/libxfs/xfs_rtbitmap.c
+++ b/libxfs/xfs_rtbitmap.c
@@ -1119,7 +1119,7 @@  xfs_rtfree_blocks(
 
 	ASSERT(rtlen <= XFS_MAX_BMBT_EXTLEN);
 
-	mod = xfs_rtb_to_rtxoff(mp, rtlen);
+	mod = xfs_blen_to_rtxoff(mp, rtlen);
 	if (mod) {
 		ASSERT(mod == 0);
 		return -EIO;
diff --git a/libxfs/xfs_rtbitmap.h b/libxfs/xfs_rtbitmap.h
index dc2b8beadfc331..e0fb36f181cc9e 100644
--- a/libxfs/xfs_rtbitmap.h
+++ b/libxfs/xfs_rtbitmap.h
@@ -101,6 +101,27 @@  xfs_blen_to_rtbxlen(
 	return div_u64(blen, mp->m_sb.sb_rextsize);
 }
 
+/* Return the offset of a file block length within an rt extent. */
+static inline xfs_extlen_t
+xfs_blen_to_rtxoff(
+	struct xfs_mount	*mp,
+	xfs_filblks_t		blen)
+{
+	if (likely(mp->m_rtxblklog >= 0))
+		return blen & mp->m_rtxblkmask;
+
+	return do_div(blen, mp->m_sb.sb_rextsize);
+}
+
+/* Round this block count up to the nearest rt extent size. */
+static inline xfs_filblks_t
+xfs_blen_roundup_rtx(
+	struct xfs_mount	*mp,
+	xfs_filblks_t		blen)
+{
+	return roundup_64(blen, mp->m_sb.sb_rextsize);
+}
+
 /* Convert an rt block number into an rt extent number. */
 static inline xfs_rtxnum_t
 xfs_rtb_to_rtx(
@@ -126,15 +147,6 @@  xfs_rtb_to_rtxoff(
 	return do_div(rtbno, mp->m_sb.sb_rextsize);
 }
 
-/* Round this rtblock up to the nearest rt extent size. */
-static inline xfs_rtblock_t
-xfs_rtb_roundup_rtx(
-	struct xfs_mount	*mp,
-	xfs_rtblock_t		rtbno)
-{
-	return roundup_64(rtbno, mp->m_sb.sb_rextsize);
-}
-
 /* Round this file block offset up to the nearest rt extent size. */
 static inline xfs_rtblock_t
 xfs_fileoff_roundup_rtx(