[3.13.y.z extended stable] Patch "jbd2: fix infinite loop when recovering corrupt journal blocks" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    jbd2: fix infinite loop when recovering corrupt journal blocks

to the linux-3.13.y-queue branch of the 3.13.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.13.y-queue

This patch is scheduled to be released in version 3.13.11.8.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.13.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From 1b0d8553efecfbea8895c34fdd838ce2127f638a Mon Sep 17 00:00:00 2001
From: "Darrick J. Wong" <darrick.wong at oracle.com>
Date: Wed, 27 Aug 2014 18:40:05 -0400
Subject: jbd2: fix infinite loop when recovering corrupt journal blocks

commit 022eaa7517017efe4f6538750c2b59a804dc7df7 upstream.

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 at oracle.com>
Signed-off-by: Theodore Ts'o <tytso at mit.edu>
Signed-off-by: Kamal Mostafa <kamal at canonical.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:
--
1.9.1