From: Theodore Ts'o <tytso@mit.edu>
Date: Thu, 14 May 2015 22:37:30 +0000 (-0400)
Subject: ext4: don't save the error information if the block device is read-only
X-Git-Tag: firefly_0821_release~4090^2~6
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=00a6e4dfa128c20861fbcd8adf3f28a8bf3a673e;p=firefly-linux-kernel-4.4.55.git

ext4: don't save the error information if the block device is read-only

Google-Bug-Id: 20939131
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
---

diff --git a/fs/ext4/super.c b/fs/ext4/super.c
index 48c8af5fe91d..fece245c796f 100644
--- a/fs/ext4/super.c
+++ b/fs/ext4/super.c
@@ -305,6 +305,8 @@ static void __save_error_info(struct super_block *sb, const char *func,
 	struct ext4_super_block *es = EXT4_SB(sb)->s_es;
 
 	EXT4_SB(sb)->s_mount_state |= EXT4_ERROR_FS;
+	if (bdev_read_only(sb->s_bdev))
+		return;
 	es->s_state |= cpu_to_le16(EXT4_ERROR_FS);
 	es->s_last_error_time = cpu_to_le32(get_seconds());
 	strncpy(es->s_last_error_func, func, sizeof(es->s_last_error_func));