linux-kernel - [PATCH -next] ext4: Fix symlink file size not match to file content

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Date:   Mon, 21 Mar 2022 19:34:08 +0800
From:   Ye Bin <yebin10@...wei.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>,
        <linux-ext4@...r.kernel.org>
CC:     <linux-kernel@...r.kernel.org>, <jack@...e.cz>,
        <lczerner@...hat.com>, Ye Bin <yebin10@...wei.com>
Subject: [PATCH -next] ext4: Fix symlink file size not match to file content

We got issue as follows:
[home]# fsck.ext4  -fn  ram0yb
e2fsck 1.45.6 (20-Mar-2020)
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Symlink /p3/d14/d1a/l3d (inode #3494) is invalid.
Clear? no
Entry 'l3d' in /p3/d14/d1a (3383) has an incorrect filetype (was 7, should be 0).
Fix? no

As symlink file size not match to file content. If symlink data block writback
failed, will call ext4_finish_bio to end io. In this path don't mark buffer
error. When umount do checkpoint can't detect buffer error, then will cleanup
jounral. Actually, correct data maybe in journal area.
To solve this issue, mark buffer error when detect bio error in ext4_finish_bio.

Signed-off-by: Ye Bin <yebin10@...wei.com>
---
 fs/ext4/page-io.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/page-io.c b/fs/ext4/page-io.c
index 495ce59fb4ad..14695e2b5042 100644
--- a/fs/ext4/page-io.c
+++ b/fs/ext4/page-io.c
@@ -134,8 +134,10 @@ static void ext4_finish_bio(struct bio *bio)
 				continue;
 			}
 			clear_buffer_async_write(bh);
-			if (bio->bi_status)
+			if (bio->bi_status) {
+				set_buffer_write_io_error(bh);
 				buffer_io_error(bh);
+			}
 		} while ((bh = bh->b_this_page) != head);
 		spin_unlock_irqrestore(&head->b_uptodate_lock, flags);
 		if (!under_io) {
-- 
2.31.1