From: Qu Wenruo <quwenruo@cn.fujitsu.com>
Date: Thu, 9 Mar 2017 01:34:38 +0000 (+0800)
Subject: btrfs: Do chunk level check for degraded remount
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=b382cfe889da5d39aeceb79e261f862c3a53eafb;p=openwrt%2Fstaging%2Fblogic.git

btrfs: Do chunk level check for degraded remount

Just the same for mount time check, use btrfs_check_rw_degradable() to
check if we are OK to be remounted rw.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
---

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2351794fbc44..e4c268c250f5 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1781,8 +1781,7 @@ static int btrfs_remount(struct super_block *sb, int *flags, char *data)
 			goto restore;
 		}
 
-		if (fs_info->fs_devices->missing_devices >
-		     fs_info->num_tolerated_disk_barrier_failures) {
+		if (!btrfs_check_rw_degradable(fs_info)) {
 			btrfs_warn(fs_info,
 				"too many missing devices, writeable remount is not allowed");
 			ret = -EACCES;