+ ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count.patch added to mm-nonmm-unstable branch

+ ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: [PATCH] ocfs2: always read both high and low parts of dinode link count
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count.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: Alexey Asemov <alex@alex-at.net>
Subject: [PATCH] ocfs2: always read both high and low parts of dinode link count
Date: Sun, 27 Nov 2022 09:46:38 +0300

When filesystem is using indexed-dirs feature, maximum link count values
can spill over to i_links_count_hi, up to OCFS2_DX_LINK_MAX links. 
ocfs2_read_links_count() checks for OCFS2_INDEXED_DIR_FL flag in dinode,
but this flag is only valid for directories so for files the check causes
high part of the link count not being read back from file dinodes
resulting in wrong link count value when file has >65535 links.

As ocfs2_set_links_count() always writes both high and low parts of link
count, the flag check on reading may be removed.

Link: https://lkml.kernel.org/r/cbfca02b-b39f-89de-e1a8-904a6c60407e@alex-at.net
Signed-off-by: Alexey Asemov <alex@alex-at.net>
Reviewed-by: Joseph Qi <joseph.qi@linux.alibaba.com>
Cc: Mark Fasheh <mark@fasheh.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Changwei Ge <gechangwei@live.cn>
Cc: Gang He <ghe@suse.com>
Cc: Jun Piao <piaojun@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ocfs2/ocfs2.h |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/fs/ocfs2/ocfs2.h~ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count
+++ a/fs/ocfs2/ocfs2.h
@@ -560,8 +560,7 @@ static inline unsigned int ocfs2_read_li
 	u32 nlink = le16_to_cpu(di->i_links_count);
 	u32 hi = le16_to_cpu(di->i_links_count_hi);
 
-	if (di->i_dyn_features & cpu_to_le16(OCFS2_INDEXED_DIR_FL))
-		nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
+	nlink |= (hi << OCFS2_LINKS_HI_SHIFT);
 
 	return nlink;
 }
_

Patches currently in -mm which might be from alex@alex-at.net are

ocfs2-always-read-both-high-and-low-parts-of-dinode-link-count.patch