[PATCH 4/7] btrfs: Do not restrict writes to btrfs devices

[Jan Kara <jack@suse.cz>]

Btrfs device probing code needs adaptation so that it works when writes
are restricted to its mounted devices. Since btrfs maintainer wants to
merge these changes through btrfs tree and there are review bandwidth
issues with that, let's not block all other filesystems and just not
restrict writes to btrfs devices for now.

CC: linux-btrfs@vger.kernel.org
CC: David Sterba <dsterba@suse.com>
CC: Josef Bacik <josef@toxicpanda.com>
CC: Chris Mason <clm@fb.com>
Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/btrfs/super.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 6ecf78d09694..0ceeb9517177 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -1403,6 +1403,8 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type,
 			return ERR_PTR(error);
 	}
 
+	/* No support for restricting writes to btrfs devices yet... */
+	mode &= ~BLK_OPEN_RESTRICT_WRITES;
 	/*
 	 * Setup a dummy root and fs_info for test/set super.  This is because
 	 * we don't actually fill this stuff out until open_ctree, but we need
-- 
2.35.3