[PATCH] btrfs-progs: balance: print warn mesg in old command

[Sidong Yang <realwakka@gmail.com>]

This patch makes old balance command to print warn mesg same as in start
command. It makes a function that print warn mesg and commands use that
function.

Issue: #411

Signed-off-by: Sidong Yang <realwakka@gmail.com>
---
 cmds/balance.c | 37 ++++++++++++++++++++++---------------
 1 file changed, 22 insertions(+), 15 deletions(-)

diff --git a/cmds/balance.c b/cmds/balance.c
index 7abc69d9..8d8db8a2 100644
--- a/cmds/balance.c
+++ b/cmds/balance.c
@@ -303,6 +303,25 @@ enum {
 	BALANCE_START_NOWARN  = 1 << 1
 };
 
+static void print_start_warn_mesg()
+{
+	int delay = 10;
+
+	printf("WARNING:\n\n");
+	printf("\tFull balance without filters requested. This operation is very\n");
+	printf("\tintense and takes potentially very long. It is recommended to\n");
+	printf("\tuse the balance filters to narrow down the scope of balance.\n");
+	printf("\tUse 'btrfs balance start --full-balance' option to skip this\n");
+	printf("\twarning. The operation will start in %d seconds.\n", delay);
+	printf("\tUse Ctrl-C to stop it.\n");
+	while (delay) {
+		printf("%2d", delay--);
+		fflush(stdout);
+		sleep(1);
+	}
+	printf("\nStarting balance without any filters.\n");
+}
+
 static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 		      unsigned flags, bool enqueue)
 {
@@ -548,21 +567,7 @@ static int cmd_balance_start(const struct cmd_struct *cmd,
 	}
 
 	if (!(start_flags & BALANCE_START_FILTERS) && !(start_flags & BALANCE_START_NOWARN)) {
-		int delay = 10;
-
-		printf("WARNING:\n\n");
-		printf("\tFull balance without filters requested. This operation is very\n");
-		printf("\tintense and takes potentially very long. It is recommended to\n");
-		printf("\tuse the balance filters to narrow down the scope of balance.\n");
-		printf("\tUse 'btrfs balance start --full-balance' option to skip this\n");
-		printf("\twarning. The operation will start in %d seconds.\n", delay);
-		printf("\tUse Ctrl-C to stop it.\n");
-		while (delay) {
-			printf("%2d", delay--);
-			fflush(stdout);
-			sleep(1);
-		}
-		printf("\nStarting balance without any filters.\n");
+		print_start_warn_mesg();
 	}
 
 	if (force)
@@ -886,6 +891,8 @@ static int cmd_balance(const struct cmd_struct *cmd, int argc, char **argv)
 		memset(&args, 0, sizeof(args));
 		args.flags |= BTRFS_BALANCE_TYPE_MASK;
 
+		print_start_warn_mesg();
+
 		/* No enqueueing supported for the obsolete syntax */
 		return do_balance(argv[1], &args, 0, false);
 	}
-- 
2.25.1