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Message-Id: <20200227132213.378746014@linuxfoundation.org>
Date: Thu, 27 Feb 2020 14:35:26 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Anand Jain <anand.jain@...cle.com>,
Johannes Thumshirn <johannes.thumshirn@....com>,
David Sterba <dsterba@...e.com>
Subject: [PATCH 4.4 010/113] btrfs: log message when rw remount is attempted with unclean tree-log
From: David Sterba <dsterba@...e.com>
commit 10a3a3edc5b89a8cd095bc63495fb1e0f42047d9 upstream.
A remount to a read-write filesystem is not safe when there's tree-log
to be replayed. Files that could be opened until now might be affected
by the changes in the tree-log.
A regular mount is needed to replay the log so the filesystem presents
the consistent view with the pending changes included.
CC: stable@...r.kernel.org # 4.4+
Reviewed-by: Anand Jain <anand.jain@...cle.com>
Reviewed-by: Johannes Thumshirn <johannes.thumshirn@....com>
Signed-off-by: David Sterba <dsterba@...e.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
fs/btrfs/super.c | 2 ++
1 file changed, 2 insertions(+)
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1702,6 +1702,8 @@ static int btrfs_remount(struct super_bl
}
if (btrfs_super_log_root(fs_info->super_copy) != 0) {
+ btrfs_warn(fs_info,
+ "mount required to replay tree-log, cannot remount read-write");
ret = -EINVAL;
goto restore;
}
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