linux-ext4 - [PATCH 1/2] jbd2: fix infinite loop when recovering corrupt journal blocks

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Message-ID: <20140815204352.16444.79311.stgit@birch.djwong.org>
Date:	Fri, 15 Aug 2014 13:43:52 -0700
From:	"Darrick J. Wong" <darrick.wong@...cle.com>
To:	tytso@....edu, darrick.wong@...cle.com
Cc:	linux-ext4@...r.kernel.org
Subject: [PATCH 1/2] jbd2: fix infinite loop when recovering corrupt journal
 blocks

From: Darrick J. Wong <darrick.wong@...cle.com>

When recovering the journal, don't fall into an infinite loop if we
encounter a corrupt journal block.  Instead, just skip the block and
return an error, which fails the mount and thus forces the user to run
a full filesystem fsck.

Signed-off-by: Darrick J. Wong <darrick.wong@...cle.com>
---
 fs/jbd2/recovery.c |    7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/fs/jbd2/recovery.c b/fs/jbd2/recovery.c
index 3b6bb19..00e9703 100644
--- a/fs/jbd2/recovery.c
+++ b/fs/jbd2/recovery.c
@@ -426,6 +426,7 @@ static int do_one_pass(journal_t *journal,
 	int			tag_bytes = journal_tag_bytes(journal);
 	__u32			crc32_sum = ~0; /* Transactional Checksums */
 	int			descr_csum_size = 0;
+	int			block_error = 0;

 	/*
 	 * First thing is to establish what we expect to find in the log
@@ -598,7 +599,8 @@ static int do_one_pass(journal_t *journal,
 						       "checksum recovering "
 						       "block %llu in log\n",
 						       blocknr);
-						continue;
+						block_error = 1;
+						goto skip_write;
 					}

 					/* Find a buffer for the new
@@ -797,7 +799,8 @@ static int do_one_pass(journal_t *journal,
 				success = -EIO;
 		}
 	}
-
+	if (block_error && success == 0)
+		success = -EIO;
 	return success;

  failed:

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