This patch makes old balance command to print warning message same as
in start command. It makes do_balance() checks flags that needs to
print warning message. It works in old command because old command also
uses do_balance().

Issue: #411

Signed-off-by: Sidong Yang <redacted>
---
v2:
 - Prints warning message in do_balance()
---
 cmds/balance.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/cmds/balance.c b/cmds/balance.c
index 7abc69d9..2e903b5c 100644
--- a/cmds/balance.c
+++ b/cmds/balance.c

@@ -322,6 +322,24 @@ static int do_balance(const char *path, struct btrfs_ioctl_balance_args *args,
 		return 1;
 	}
 
+	if (!(flags & BALANCE_START_FILTERS) && !(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");
+	}
+
 	ret = ioctl(fd, BTRFS_IOC_BALANCE_V2, args);
 	if (ret < 0) {
 		/*

@@ -547,24 +565,6 @@ static int cmd_balance_start(const struct cmd_struct *cmd,
 		printf("\nStarting conversion to RAID5/6.\n");
 	}
 
-	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");
-	}
-
 	if (force)
 		args.flags |= BTRFS_BALANCE_FORCE;
 	if (bconf.verbose > BTRFS_BCONF_QUIET)

-- 
2.25.1