[PATCH 1/4] xfsprogs: Introduce xfs_iext_max() helper

[Chandan Babu R <chandanrlinux@gmail.com>]

xfs_iext_max() returns the maximum number of extents possible for either
data fork or attribute fork. This helper will be extended further in a
future commit when maximum extent counts associated with data/attribute
forks are increased.

No functional changes have been made.

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
---
 libxfs/xfs_bmap.c       |  9 ++++-----
 libxfs/xfs_inode_buf.c  |  9 ++++-----
 libxfs/xfs_inode_fork.h | 10 ++++++++++
 repair/dinode.c         | 23 ++++++++++++++---------
 4 files changed, 32 insertions(+), 19 deletions(-)

diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index 11f3f5f9..dae4d339 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -67,13 +67,12 @@ xfs_bmap_compute_maxlevels(
 	 * for both ATTR1 and ATTR2 we have to assume the worst case scenario
 	 * of a minimum size available.
 	 */
-	if (whichfork == XFS_DATA_FORK) {
-		maxleafents = MAXEXTNUM;
+	maxleafents = xfs_iext_max(&mp->m_sb, whichfork);
+	if (whichfork == XFS_DATA_FORK)
 		sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
-	} else {
-		maxleafents = MAXAEXTNUM;
+	else
 		sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
-	}
+
 	maxrootrecs = xfs_bmdr_maxrecs(sz, 0);
 	minleafrecs = mp->m_bmap_dmnr[0];
 	minnoderecs = mp->m_bmap_dmnr[1];
diff --git a/libxfs/xfs_inode_buf.c b/libxfs/xfs_inode_buf.c
index b65cd0b1..ae71a19e 100644
--- a/libxfs/xfs_inode_buf.c
+++ b/libxfs/xfs_inode_buf.c
@@ -363,6 +363,8 @@ xfs_dinode_verify_fork(
 	int			whichfork)
 {
 	uint32_t		di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
+	xfs_extnum_t		max_extents;
+
 
 	switch (XFS_DFORK_FORMAT(dip, whichfork)) {
 	case XFS_DINODE_FMT_LOCAL:
@@ -384,12 +386,9 @@ xfs_dinode_verify_fork(
 			return __this_address;
 		break;
 	case XFS_DINODE_FMT_BTREE:
-		if (whichfork == XFS_ATTR_FORK) {
-			if (di_nextents > MAXAEXTNUM)
-				return __this_address;
-		} else if (di_nextents > MAXEXTNUM) {
+		max_extents = xfs_iext_max(&mp->m_sb, whichfork);
+		if (di_nextents > max_extents)
 			return __this_address;
-		}
 		break;
 	default:
 		return __this_address;
diff --git a/libxfs/xfs_inode_fork.h b/libxfs/xfs_inode_fork.h
index 668ee942..e318dfdd 100644
--- a/libxfs/xfs_inode_fork.h
+++ b/libxfs/xfs_inode_fork.h
@@ -86,6 +86,16 @@ struct xfs_ifork {
 	(XFS_IFORK_FORMAT((ip), (w)) == XFS_DINODE_FMT_EXTENTS || \
 	 XFS_IFORK_FORMAT((ip), (w)) == XFS_DINODE_FMT_BTREE)
 
+static inline xfs_extnum_t xfs_iext_max(struct xfs_sb *sbp, int whichfork)
+{
+	ASSERT(whichfork == XFS_DATA_FORK || whichfork == XFS_ATTR_FORK);
+
+	if (whichfork == XFS_DATA_FORK)
+		return MAXEXTNUM;
+	else
+		return MAXAEXTNUM;
+}
+
 struct xfs_ifork *xfs_iext_state_to_fork(struct xfs_inode *ip, int state);
 
 int		xfs_iformat_fork(struct xfs_inode *, struct xfs_dinode *);
diff --git a/repair/dinode.c b/repair/dinode.c
index 526ecde3..de9a3286 100644
--- a/repair/dinode.c
+++ b/repair/dinode.c
@@ -1727,13 +1727,16 @@ _("bad attr fork offset %d in inode %" PRIu64 ", max=%zu\n"),
  */
 static int
 process_inode_blocks_and_extents(
-	xfs_dinode_t	*dino,
-	xfs_rfsblock_t	nblocks,
-	uint64_t	nextents,
-	uint64_t	anextents,
-	xfs_ino_t	lino,
-	int		*dirty)
+	struct xfs_mount	*mp,
+	xfs_dinode_t		*dino,
+	xfs_rfsblock_t		nblocks,
+	uint64_t		nextents,
+	uint64_t		anextents,
+	xfs_ino_t		lino,
+	int			*dirty)
 {
+	xfs_extnum_t		max_extents;
+
 	if (nblocks != be64_to_cpu(dino->di_nblocks))  {
 		if (!no_modify)  {
 			do_warn(
@@ -1750,7 +1753,8 @@ _("bad nblocks %llu for inode %" PRIu64 ", would reset to %" PRIu64 "\n"),
 		}
 	}
 
-	if (nextents > MAXEXTNUM)  {
+	max_extents = xfs_iext_max(&mp->m_sb, XFS_DATA_FORK);
+	if (nextents > max_extents)  {
 		do_warn(
 _("too many data fork extents (%" PRIu64 ") in inode %" PRIu64 "\n"),
 			nextents, lino);
@@ -1773,7 +1777,8 @@ _("bad nextents %d for inode %" PRIu64 ", would reset to %" PRIu64 "\n"),
 		}
 	}
 
-	if (anextents > MAXAEXTNUM)  {
+	max_extents = xfs_iext_max(&mp->m_sb, XFS_ATTR_FORK);
+	if (anextents > max_extents)  {
 		do_warn(
 _("too many attr fork extents (%" PRIu64 ") in inode %" PRIu64 "\n"),
 			anextents, lino);
@@ -2712,7 +2717,7 @@ _("Bad CoW extent size %u on inode %" PRIu64 ", "),
 	/*
 	 * correct space counters if required
 	 */
-	if (process_inode_blocks_and_extents(dino, totblocks + atotblocks,
+	if (process_inode_blocks_and_extents(mp, dino, totblocks + atotblocks,
 			nextents, anextents, lino, dirty) != 0)
 		goto clear_bad_out;
 
-- 
2.28.0