btrfs: print message when tree-log replay starts

There's no logged information about tree-log replay although this is
something that points to previous unclean unmount. Other filesystems
report that as well.

Suggested-by: Chris Murphy <[email protected]>
CC: [email protected] # 4.4+
Reviewed-by: Anand Jain <[email protected]>
Reviewed-by: Johannes Thumshirn <[email protected]>
Signed-off-by: David Sterba <[email protected]>

Author: kdave

fs/btrfs/disk-io.c

@@ -3164,6 +3164,7 @@ int __cold open_ctree(struct super_block *sb,
 	/* do not make disk changes in broken FS or nologreplay is given */
 	if (btrfs_super_log_root(disk_super) != 0 &&
 	    !btrfs_test_opt(fs_info, NOLOGREPLAY)) {
+		btrfs_info(fs_info, "start tree-log replay");
 		ret = btrfs_replay_log(fs_info, fs_devices);
 		if (ret) {
 			err = ret;