[PATCH] bcachefs-tools: add usage function for fs subcommand

[Integral <integral@archlinuxcn.org>]

Add the missing usage function for "fs" subcommand; when no matching
subcommand exists, print the usage and return -EINVAL.

Signed-off-by: Integral <integral@archlinuxcn.org>
---
 c_src/bcachefs.c |  9 ++++-----
 c_src/cmd_fs.c   | 12 ++++++++++++
 c_src/cmds.h     |  1 +
 3 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/c_src/bcachefs.c b/c_src/bcachefs.c
index 77bf6215..e9e617e1 100644
--- a/c_src/bcachefs.c
+++ b/c_src/bcachefs.c
@@ -113,14 +113,13 @@ int fs_cmds(int argc, char *argv[])
 {
 	char *cmd = pop_cmd(&argc, argv);

-	if (argc < 1) {
-		bcachefs_usage();
-		exit(EXIT_FAILURE);
-	}
+	if (argc < 1)
+		return fs_usage();
 	if (!strcmp(cmd, "usage"))
 		return cmd_fs_usage(argc, argv);

-	return 0;
+	fs_usage();
+	return -EINVAL;
 }

 int device_cmds(int argc, char *argv[])
diff --git a/c_src/cmd_fs.c b/c_src/cmd_fs.c
index 82eeceff..eb8f7d2e 100644
--- a/c_src/cmd_fs.c
+++ b/c_src/cmd_fs.c
@@ -487,6 +487,18 @@ devs:
 	bcache_fs_close(fs);
 }

+int fs_usage(void)
+{
+       puts("bcachefs fs - manage a running filesystem\n"
+            "Usage: bcachefs fs <CMD> [OPTIONS]\n"
+            "\n"
+            "Commands:\n"
+            "  usage                     Display detailed filesystem usage\n"
+            "\n"
+            "Report bugs to <linux-bcachefs@vger.kernel.org>");
+       return 0;
+}
+
 static void fs_usage_usage(void)
 {
 	puts("bcachefs fs usage - display detailed filesystem usage\n"
diff --git a/c_src/cmds.h b/c_src/cmds.h
index 64267dc4..99016d52 100644
--- a/c_src/cmds.h
+++ b/c_src/cmds.h
@@ -14,6 +14,7 @@ int cmd_show_super(int argc, char *argv[]);
 int cmd_reset_counters(int argc, char *argv[]);
 int cmd_set_option(int argc, char *argv[]);

+int fs_usage(void);
 int cmd_fs_usage(int argc, char *argv[]);

 int device_usage(void);
--
2.47.0