From b5776e7524afbd4569978ff790864755c438bba7 Mon Sep 17 00:00:00 2001
From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 4 Feb 2021 00:05:20 -0500
Subject: [PATCH] ext4: fix potential htree index checksum corruption
Git-commit: b5776e7524afbd4569978ff790864755c438bba7
Patch-mainline: v5.12-rc1
References: bsc#1184728
In the case where we need to do an interior node split, and
immediately afterwards, we are unable to allocate a new directory leaf
block due to ENOSPC, the directory index checksum's will not be filled
in correctly (and indeed, will not be correctly journalled).
This looks like a bug that was introduced when we added largedir
support. The original code doesn't make any sense (and should have
been caught in code review), but it was hidden because most of the
time, the index node checksum will be set by do_split(). But if
do_split bails out due to ENOSPC, then ext4_handle_dirty_dx_node()
won't get called, and so the directory index checksum field will not
get set, leading to:
EXT4-fs error (device sdb): dx_probe:858: inode #6635543: block 4022: comm nfsd: Directory index failed checksum
Google-bug-id: 176345532
Fixes: e08ac99fa2a2 ("ext4: add largedir feature")
Cc: Artem Blagodarenko <artem.blagodarenko@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Acked-by: Jan Kara <jack@suse.cz>
---
fs/ext4/namei.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff --git a/fs/ext4/namei.c b/fs/ext4/namei.c
index a6e28b4b5a95..115762180801 100644
--- a/fs/ext4/namei.c
+++ b/fs/ext4/namei.c
@@ -2411,11 +2411,10 @@ static int ext4_dx_add_entry(handle_t *handle, struct ext4_filename *fname,
(frame - 1)->bh);
if (err)
goto journal_error;
- if (restart) {
- err = ext4_handle_dirty_dx_node(handle, dir,
- frame->bh);
+ err = ext4_handle_dirty_dx_node(handle, dir,
+ frame->bh);
+ if (err)
goto journal_error;
- }
} else {
struct dx_root *dxroot;
memcpy((char *) entries2, (char *) entries,
--
2.26.2