+ fat-release-buffer-head-after-rebuilding-parent.patch added to mm-nonmm-unstable branch

+ fat-release-buffer-head-after-rebuilding-parent.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: fat: release buffer head after rebuilding parent
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     fat-release-buffer-head-after-rebuilding-parent.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fat-release-buffer-head-after-rebuilding-parent.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: Yichong Chen <chenyichong@uniontech.com>
Subject: fat: release buffer head after rebuilding parent
Date: Wed, 15 Jul 2026 10:09:57 +0800

fat_scan_logstart() leaves the matching directory entry's buffer head in
sinfo.bh for the caller to release, just like fat_scan().

fat_rebuild_parent() uses the directory entry to rebuild the parent inode
for the nostale_ro NFS export path, but does not release sinfo.bh after a
successful scan.  Release it once fat_build_inode() has consumed the
directory entry data.

Link: https://lore.kernel.org/20260715020957.1096309-1-chenyichong@uniontech.com
Fixes: f1e6fb0ab451 ("fat (exportfs): rebuild directory-inode if fat_dget()")
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Amit Sahrawat <a.sahrawat@samsung.com>
Cc: chenyichong <chenyichong@uniontech.com>
Cc: Namjae Jeon <namjae.jeon@samsung.com>
Cc: Ravishankar N <ravi.n1@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/fat/nfs.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/fs/fat/nfs.c~fat-release-buffer-head-after-rebuilding-parent
+++ a/fs/fat/nfs.c
@@ -250,8 +250,10 @@ struct inode *fat_rebuild_parent(struct
 		MSDOS_I(dummy_grand_parent)->i_pos = -1;
 	}
 
-	if (!fat_scan_logstart(dummy_grand_parent, clus_to_match, &sinfo))
+	if (!fat_scan_logstart(dummy_grand_parent, clus_to_match, &sinfo)) {
 		parent = fat_build_inode(sb, sinfo.de, sinfo.i_pos);
+		brelse(sinfo.bh);
+	}
 
 	brelse(parent_bh);
 	iput(dummy_grand_parent);
_

Patches currently in -mm which might be from chenyichong@uniontech.com are

tools-mm-page_owner_sort-return-explicit-filter-results.patch
tools-mm-page_owner_sort-free-per-record-allocations.patch
tools-mm-page_owner_sort-bound-pattern-output-copies.patch
fat-release-buffer-head-after-rebuilding-parent.patch