linux-kernel - [PATCH 3/5] ext4: don't perform block validity checks on the journal inode

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Message-ID: <a445724ea86bdab8ad4b093f3b9a68110edcb407.1587718568.git.ashwinh@vmware.com>
Date:   Thu, 30 Apr 2020 10:05:19 +0530
From:   ashwin-h <ashwinh@...are.com>
To:     <tytso@....edu>, <adilger.kernel@...ger.ca>
CC:     <linux-ext4@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <stable@...nel.org>, <srivatsab@...are.com>,
        <srivatsa@...il.mit.edu>, <rostedt@...dmis.org>,
        <srostedt@...are.com>, <gregkh@...uxfoundation.org>,
        <ashwin.hiranniah@...il.com>, Ashwin H <ashwinh@...are.com>
Subject: [PATCH 3/5] ext4: don't perform block validity checks on the journal inode

From: Theodore Ts'o <tytso@....edu>

commit 0a944e8a6c66ca04c7afbaa17e22bf208a8b37f0 upstream.

Since the journal inode is already checked when we added it to the
block validity's system zone, if we check it again, we'll just trigger
a failure.

This was causing failures like this:

[   53.897001] EXT4-fs error (device sda): ext4_find_extent:909: inode
#8: comm jbd2/sda-8: pblk 121667583 bad header/extent: invalid extent entries - magic f30a, entries 8, max 340(340), depth 0(0)
[   53.931430] jbd2_journal_bmap: journal block not found at offset 49 on sda-8
[   53.938480] Aborting journal on device sda-8.

... but only if the system was under enough memory pressure that
logical->physical mapping for the journal inode gets pushed out of the
extent cache.  (This is why it wasn't noticed earlier.)

Fixes: 345c0dbf3a30 ("ext4: protect journal inode's blocks using block_validity")
Reported-by: Dan Rue <dan.rue@...aro.org>
Signed-off-by: Theodore Ts'o <tytso@....edu>
Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Signed-off-by: Ashwin H <ashwinh@...are.com>
---
 fs/ext4/extents.c | 12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 8d98c9a..71492bf 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -525,10 +525,14 @@ __read_extent_tree_block(const char *function, unsigned int line,
 	}
 	if (buffer_verified(bh) && !(flags & EXT4_EX_FORCE_CACHE))
 		return bh;
-	err = __ext4_ext_check(function, line, inode,
-			       ext_block_hdr(bh), depth, pblk);
-	if (err)
-		goto errout;
+	if (!ext4_has_feature_journal(inode->i_sb) ||
+	    (inode->i_ino !=
+	     le32_to_cpu(EXT4_SB(inode->i_sb)->s_es->s_journal_inum))) {
+		err = __ext4_ext_check(function, line, inode,
+				       ext_block_hdr(bh), depth, pblk);
+		if (err)
+			goto errout;
+	}
 	set_buffer_verified(bh);
 	/*
 	 * If this is a leaf block, cache all of its entries
-- 
2.7.4