linux-kernel - [PATCH 3.12 28/60] ext4: return EROFS if device is r/o and journal replay is needed

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Message-Id: <05751f20bcfcd4b3372c0204bd0d184b72ed0ad1.1489497268.git.jslaby@suse.cz>
Date:   Tue, 14 Mar 2017 14:15:19 +0100
From:   Jiri Slaby <jslaby@...e.cz>
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, Theodore Ts'o <tytso@....edu>,
        Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 28/60] ext4: return EROFS if device is r/o and journal replay is needed

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

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 4753d8a24d4588657bc0a4cd66d4e282dff15c8c upstream.

If the file system requires journal recovery, and the device is
read-ony, return EROFS to the mount system call.  This allows xfstests
generic/050 to pass.

Signed-off-by: Theodore Ts'o <tytso@....edu>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 fs/ext4/super.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 01fc2b14db0e..3f19909f5431 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -3977,7 +3977,8 @@ static int ext4_fill_super(struct super_block *sb, void *data, int silent)
 	 */
 	if (!test_opt(sb, NOLOAD) &&
 	    EXT4_HAS_COMPAT_FEATURE(sb, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
-		if (ext4_load_journal(sb, es, journal_devnum))
+		err = ext4_load_journal(sb, es, journal_devnum);
+		if (err)
 			goto failed_mount3;
 	} else if (test_opt(sb, NOLOAD) && !(sb->s_flags & MS_RDONLY) &&
 	      EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_RECOVER)) {
-- 
2.12.0