+ ocfs2-abstract-the-dinode-suballoc-slot-checks.patch added to mm-nonmm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: ocfs2: abstract the dinode suballoc slot checks
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     ocfs2-abstract-the-dinode-suballoc-slot-checks.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-abstract-the-dinode-suballoc-slot-checks.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Joseph Qi <joseph.qi@linux.alibaba.com>
Subject: ocfs2: abstract the dinode suballoc slot checks
Date: Mon, 09 Nov 2026 20:20:56 +0800

The suballoc slot validation is a nested if/else-if whose two arms carry
different error messages.  Split it into two predicates so each message
stays at its own call site without having to re-test the slot value to
work out which arm fired.

The arms were already mutually exclusive, so two sequential tests are
equivalent to the if/else-if.

Keep the OCFS2_INVALID_SLOT exclusion in the range predicate.
OCFS2_INVALID_SLOT is 65535, which is greater than max_slots - 1, so
without it every system inode mkfs.ocfs2 creates from the global
allocator would be rejected.

ocfs2_get_suballoc_slot_bit() in suballoc.c open-codes an identical range
test, and is deliberately not converted.  The dinode validator pairs the
range predicate with ocfs2_dinode_has_invalid_suballoc_slot(), which also
rejects OCFS2_INVALID_SLOT on a non-system inode, so that pair is stricter
than what ocfs2_get_suballoc_slot_bit() accepts.  The range predicate on
its own is not stricter, it is the same test.

No functional change intended.

Link: https://lore.kernel.org/20261109122121.21473-7-joseph.qi@linux.alibaba.com
Signed-off-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Heming Zhao <heming.zhao@suse.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
---

 fs/ocfs2/inode.c |   31 ++++++++++++++++++++++---------
 1 file changed, 22 insertions(+), 9 deletions(-)

--- a/fs/ocfs2/inode.c~ocfs2-abstract-the-dinode-suballoc-slot-checks
+++ a/fs/ocfs2/inode.c
@@ -98,6 +98,19 @@ static bool ocfs2_dinode_has_wrong_fs_ge
 	return le32_to_cpu(di->i_fs_generation) != OCFS2_SB(sb)->fs_generation;
 }
 
+static bool ocfs2_dinode_has_invalid_suballoc_slot(struct ocfs2_dinode *di)
+{
+	return le16_to_cpu(di->i_suballoc_slot) == (u16)OCFS2_INVALID_SLOT &&
+		!(le32_to_cpu(di->i_flags) & OCFS2_SYSTEM_FL);
+}
+
+static bool ocfs2_dinode_has_out_of_range_suballoc_slot(struct super_block *sb,
+							struct ocfs2_dinode *di)
+{
+	return le16_to_cpu(di->i_suballoc_slot) != (u16)OCFS2_INVALID_SLOT &&
+		(u32)le16_to_cpu(di->i_suballoc_slot) > OCFS2_SB(sb)->max_slots - 1;
+}
+
 static bool ocfs2_valid_inode_mode(umode_t mode)
 {
 	return fs_umode_to_ftype(mode) != FT_UNKNOWN;
@@ -1564,15 +1577,15 @@ int ocfs2_validate_inode_block(struct su
 	 * deleting it would pass the slot to get_local_system_inode() via
 	 * ocfs2_remove_inode() and trigger BUG_ON(slot == OCFS2_INVALID_SLOT).
 	 */
-	if (le16_to_cpu(di->i_suballoc_slot) == (u16)OCFS2_INVALID_SLOT) {
-		if (!(le32_to_cpu(di->i_flags) & OCFS2_SYSTEM_FL)) {
-			rc = ocfs2_error(sb,
-					 "Invalid dinode %llu: suballoc slot %u for non-system inode\n",
-					 (unsigned long long)bh->b_blocknr,
-					 le16_to_cpu(di->i_suballoc_slot));
-			goto bail;
-		}
-	} else if ((u32)le16_to_cpu(di->i_suballoc_slot) > OCFS2_SB(sb)->max_slots - 1) {
+	if (ocfs2_dinode_has_invalid_suballoc_slot(di)) {
+		rc = ocfs2_error(sb,
+				 "Invalid dinode %llu: suballoc slot %u for non-system inode\n",
+				 (unsigned long long)bh->b_blocknr,
+				 le16_to_cpu(di->i_suballoc_slot));
+		goto bail;
+	}
+
+	if (ocfs2_dinode_has_out_of_range_suballoc_slot(sb, di)) {
 		rc = ocfs2_error(sb, "Invalid dinode %llu: suballoc slot %u\n",
 				 (unsigned long long)bh->b_blocknr,
 				 le16_to_cpu(di->i_suballoc_slot));
_

Patches currently in -mm which might be from joseph.qi@linux.alibaba.com are

ocfs2-exempt-orphaned-dinodes-from-the-zero-nlink-check.patch
ocfs2-abstract-the-zero-nlink-or-mode-dinode-check.patch
ocfs2-abstract-the-dinode-i_blkno-mismatch-check.patch
ocfs2-abstract-the-dinode-ocfs2_valid_fl-check.patch
ocfs2-abstract-the-dinode-fs_generation-mismatch-check.patch
ocfs2-abstract-the-dinode-suballoc-slot-checks.patch
ocfs2-abstract-the-dinode-suballoc-bit-check.patch
ocfs2-abstract-the-dinode-orphaned-slot-check.patch
ocfs2-abstract-the-dinode-dio-orphaned-slot-check.patch
ocfs2-abstract-the-inline-data-dinode-guard-and-cluster-check.patch
ocfs2-abstract-the-inline-data-id_count-bound-check.patch
ocfs2-abstract-the-inline-data-i_size-bound-check.patch
ocfs2-abstract-the-fast-symlink-dinode-guard-and-size-check.patch
ocfs2-abstract-the-fast-symlink-nul-termination-check.patch
ocfs2-abstract-the-chain-list-dinode-guard-and-count-check.patch
ocfs2-abstract-the-chain-list-next-free-record-check.patch
ocfs2-abstract-the-chain-list-bits-per-cluster-check.patch
ocfs2-abstract-the-dinode-refcount-location-check.patch
ocfs2-abstract-the-zero-extent-list-count-check.patch
ocfs2-abstract-the-oversized-extent-list-count-check.patch
ocfs2-abstract-the-extent-list-next-free-record-check.patch
ocfs2-report-unrepairable-corruption-from-online-filecheck-fix.patch
ocfs2-check-dinode-nlink-and-mode-in-online-filecheck.patch
ocfs2-check-dinode-suballoc-slot-in-online-filecheck.patch
ocfs2-check-dinode-suballoc-bit-in-online-filecheck.patch
ocfs2-check-dinode-orphaned-slots-in-online-filecheck.patch
ocfs2-check-inline-data-dinodes-in-online-filecheck.patch
ocfs2-check-fast-symlink-dinodes-in-online-filecheck.patch
ocfs2-check-chain-list-dinodes-in-online-filecheck.patch
ocfs2-check-dinode-refcount-location-in-online-filecheck.patch
ocfs2-check-extent-list-dinodes-in-online-filecheck.patch