+ ocfs2-check-dinode-nlink-and-mode-in-online-filecheck.patch added to mm-nonmm-unstable branch

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

The patch titled
     Subject: ocfs2: check dinode nlink and mode in online filecheck
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     ocfs2-check-dinode-nlink-and-mode-in-online-filecheck.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-check-dinode-nlink-and-mode-in-online-filecheck.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: check dinode nlink and mode in online filecheck
Date: Mon, 09 Nov 2026 20:21:13 +0800

The filecheck validator shares most of its conditions with
ocfs2_validate_inode_block(), but skips the zero nlink or mode check.
Wire it in using the predicate the two now share.

Filecheck reports OCFS2_FILECHECK_ERR_INVALIDINO and logs with the
Filecheck prefix rather than calling ocfs2_error(), which would escalate
to ocfs2_handle_error() and could force the filesystem read-only while
an administrator is only asking for a diagnosis.

The check is placed after the ecc and signature gate so that the
existing coupling is preserved: a bad signature still overrides a
checksum failure with INVALIDINO, and every later check still runs only
on an ecc-clean block.

Link: https://lore.kernel.org/20261109122121.21473-24-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 |    9 +++++++++
 1 file changed, 9 insertions(+)

--- a/fs/ocfs2/inode.c~ocfs2-check-dinode-nlink-and-mode-in-online-filecheck
+++ a/fs/ocfs2/inode.c
@@ -2020,6 +2020,15 @@ static int ocfs2_filecheck_validate_inod
 		goto bail;
 	}
 
+	if (ocfs2_dinode_has_zero_nlink_or_mode(di)) {
+		mlog(ML_ERROR,
+		     "Filecheck: invalid dinode #%llu: nlink = %u or mode = %u\n",
+		     (unsigned long long)bh->b_blocknr,
+		     ocfs2_read_links_count(di), le16_to_cpu(di->i_mode));
+		rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
+		goto bail;
+	}
+
 	if (!ocfs2_valid_inode_mode(le16_to_cpu(di->i_mode))) {
 		mlog(ML_ERROR,
 		     "Filecheck: invalid dinode #%llu: mode 0%o has unknown file type\n",
_

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