1 files changed, 107 insertions, 0 deletions
diff --git a/c_src/cmd_option.c b/c_src/cmd_option.c
new file mode 100644
index 00000000..6ce34016
--- /dev/null
+++ b/c_src/cmd_option.c
@@ -0,0 +1,107 @@
+/*
+ * Authors: Kent Overstreet <kent.overstreet@gmail.com>
+ *
+ * GPLv2
+ */
+#include <ctype.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <getopt.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <uuid/uuid.h>
+
+#include "cmds.h"
+#include "libbcachefs.h"
+#include "libbcachefs/errcode.h"
+#include "libbcachefs/opts.h"
+#include "libbcachefs/super-io.h"
+
+static void set_option_usage(void)
+{
+	puts("bcachefs set-option \n"
+	     "Usage: bcachefs set-option [OPTION].. device\n"
+	     "\n"
+	     "Options:\n");
+	bch2_opts_usage(OPT_MOUNT);
+	puts("  -h, --help                  display this help and exit\n"
+	     "Report bugs to <linux-bcachefs@vger.kernel.org>");
+	exit(EXIT_SUCCESS);
+}
+
+int cmd_set_option(int argc, char *argv[])
+{
+	struct bch_opt_strs new_opt_strs = bch2_cmdline_opts_get(&argc, argv, OPT_MOUNT);
+	struct bch_opts new_opts = bch2_parse_opts(new_opt_strs);
+	struct bch_opts open_opts = bch2_opts_empty();
+	unsigned i;
+	int opt, ret = 0;
+
+	opt_set(open_opts, nostart, true);
+
+	while ((opt = getopt(argc, argv, "h")) != -1)
+		switch (opt) {
+		case 'h':
+			set_option_usage();
+			break;
+		}
+	args_shift(optind);
+
+	if (!argc) {
+		fprintf(stderr, "Please supply device(s)\n");
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 0; i < argc; i++)
+		if (dev_mounted(argv[i]))
+			goto online;
+
+	struct bch_fs *c = bch2_fs_open(argv, argc, open_opts);
+	if (IS_ERR(c)) {
+		fprintf(stderr, "error opening %s: %s\n", argv[0], bch2_err_str(PTR_ERR(c)));
+		exit(EXIT_FAILURE);
+	}
+
+	for (i = 0; i < bch2_opts_nr; i++) {
+		u64 v = bch2_opt_get_by_id(&new_opts, i);
+
+		if (!bch2_opt_defined_by_id(&new_opts, i))
+			continue;
+
+		ret = bch2_opt_check_may_set(c, i, v);
+		if (ret < 0) {
+			fprintf(stderr, "error setting %s: %i\n",
+				bch2_opt_table[i].attr.name, ret);
+			break;
+		}
+
+		bch2_opt_set_sb(c, bch2_opt_table + i, v);
+		bch2_opt_set_by_id(&c->opts, i, v);
+	}
+
+	bch2_fs_stop(c);
+	return ret;
+online:
+	{
+		unsigned dev_idx;
+		struct bchfs_handle fs = bchu_fs_open_by_dev(argv[i], &dev_idx);
+
+		for (i = 0; i < bch2_opts_nr; i++) {
+			if (!new_opt_strs.by_id[i])
+				continue;
+
+			char *path = mprintf("options/%s", bch2_opt_table[i].attr.name);
+
+			write_file_str(fs.sysfs_fd, path, new_opt_strs.by_id[i]);
+			free(path);
+		}
+	}
+	return 0;
+}