1 files changed, 393 insertions, 0 deletions
diff --git a/c_src/cmd_format.c b/c_src/cmd_format.c
new file mode 100644
index 00000000..45c44e32
--- /dev/null
+++ b/c_src/cmd_format.c
@@ -0,0 +1,393 @@
+/*
+ * Authors: Kent Overstreet <kent.overstreet@gmail.com>
+ *	    Gabriel de Perthuis <g2p.code@gmail.com>
+ *	    Jacob Malevich <jam@datera.io>
+ *
+ * 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 "crypto.h"
+#include "libbcachefs/darray.h"
+#include "libbcachefs/errcode.h"
+#include "libbcachefs/opts.h"
+#include "libbcachefs/super-io.h"
+#include "libbcachefs/util.h"
+
+#define OPTS						\
+x(0,	replicas,		required_argument)	\
+x(0,	encrypted,		no_argument)		\
+x(0,	no_passphrase,		no_argument)		\
+x('L',	fs_label,		required_argument)	\
+x('U',	uuid,			required_argument)	\
+x(0,	fs_size,		required_argument)	\
+x(0,	superblock_size,	required_argument)	\
+x(0,	bucket_size,		required_argument)	\
+x('l',	label,			required_argument)	\
+x(0,	discard,		no_argument)		\
+x(0,	data_allowed,		required_argument)	\
+x(0,	durability,		required_argument)	\
+x(0,	version,		required_argument)	\
+x(0,	no_initialize,		no_argument)		\
+x('f',	force,			no_argument)		\
+x('q',	quiet,			no_argument)		\
+x('v',	verbose,		no_argument)		\
+x('h',	help,			no_argument)
+
+static void usage(void)
+{
+	puts("bcachefs format - create a new bcachefs filesystem on one or more devices\n"
+	     "Usage: bcachefs format [OPTION]... <devices>\n"
+	     "\n"
+	     "Options:");
+
+	bch2_opts_usage(OPT_FORMAT);
+
+	puts(
+	     "      --replicas=#            Sets both data and metadata replicas\n"
+	     "      --encrypted             Enable whole filesystem encryption (chacha20/poly1305)\n"
+	     "      --no_passphrase         Don't encrypt master encryption key\n"
+	     "  -L, --fs_label=label\n"
+	     "  -U, --uuid=uuid\n"
+	     "      --superblock_size=size\n"
+	     "\n"
+	     "Device specific options:");
+
+	bch2_opts_usage(OPT_DEVICE);
+
+	puts("  -l, --label=label           Disk label\n"
+	     "\n"
+	     "  -f, --force\n"
+	     "  -q, --quiet                 Only print errors\n"
+	     "  -v, --verbose               Verbose filesystem initialization\n"
+	     "  -h, --help                  Display this help and exit\n"
+	     "\n"
+	     "Device specific options must come before corresponding devices, e.g.\n"
+	     "  bcachefs format --label cache /dev/sdb /dev/sdc\n"
+	     "\n"
+	     "Report bugs to <linux-bcachefs@vger.kernel.org>");
+}
+
+enum {
+	O_no_opt = 1,
+#define x(shortopt, longopt, arg)	O_##longopt,
+	OPTS
+#undef x
+};
+
+#define x(shortopt, longopt, arg) {			\
+	.name		= #longopt,			\
+	.has_arg	= arg,				\
+	.flag		= NULL,				\
+	.val		= O_##longopt,			\
+},
+static const struct option format_opts[] = {
+	OPTS
+	{ NULL }
+};
+#undef x
+
+u64 read_flag_list_or_die(char *opt, const char * const list[],
+			  const char *msg)
+{
+	u64 v = bch2_read_flag_list(opt, list);
+	if (v == (u64) -1)
+		die("Bad %s %s", msg, opt);
+
+	return v;
+}
+
+int cmd_format(int argc, char *argv[])
+{
+	DARRAY(struct dev_opts) devices = { 0 };
+	DARRAY(char *) device_paths = { 0 };
+	struct format_opts opts	= format_opts_default();
+	struct dev_opts dev_opts = dev_opts_default();
+	bool force = false, no_passphrase = false, quiet = false, initialize = true, verbose = false;
+	bool unconsumed_dev_option = false;
+	unsigned v;
+	int opt;
+
+	struct bch_opt_strs fs_opt_strs =
+		bch2_cmdline_opts_get(&argc, argv, OPT_FORMAT);
+	struct bch_opts fs_opts = bch2_parse_opts(fs_opt_strs);
+
+	while ((opt = getopt_long(argc, argv,
+				  "-L:U:g:fqhv",
+				  format_opts,
+				  NULL)) != -1)
+		switch (opt) {
+		case O_replicas:
+			if (kstrtouint(optarg, 10, &v) ||
+			    !v ||
+			    v > BCH_REPLICAS_MAX)
+				die("invalid replicas");
+
+			opt_set(fs_opts, metadata_replicas, v);
+			opt_set(fs_opts, data_replicas, v);
+			break;
+		case O_encrypted:
+			opts.encrypted = true;
+			break;
+		case O_no_passphrase:
+			no_passphrase = true;
+			break;
+		case O_fs_label:
+		case 'L':
+			opts.label = optarg;
+			break;
+		case O_uuid:
+		case 'U':
+			if (uuid_parse(optarg, opts.uuid.b))
+				die("Bad uuid");
+			break;
+		case O_force:
+		case 'f':
+			force = true;
+			break;
+		case O_fs_size:
+			if (bch2_strtoull_h(optarg, &dev_opts.size))
+				die("invalid filesystem size");
+			unconsumed_dev_option = true;
+			break;
+		case O_superblock_size:
+			if (bch2_strtouint_h(optarg, &opts.superblock_size))
+				die("invalid filesystem size");
+
+			opts.superblock_size >>= 9;
+			break;
+		case O_bucket_size:
+			if (bch2_strtoull_h(optarg, &dev_opts.bucket_size))
+				die("bad bucket_size %s", optarg);
+			unconsumed_dev_option = true;
+			break;
+		case O_label:
+		case 'l':
+			dev_opts.label = optarg;
+			unconsumed_dev_option = true;
+			break;
+		case O_discard:
+			dev_opts.discard = true;
+			unconsumed_dev_option = true;
+			break;
+		case O_data_allowed:
+			dev_opts.data_allowed =
+				read_flag_list_or_die(optarg,
+					bch2_data_types, "data type");
+			unconsumed_dev_option = true;
+			break;
+		case O_durability:
+			if (kstrtouint(optarg, 10, &dev_opts.durability) ||
+			    dev_opts.durability > BCH_REPLICAS_MAX)
+				die("invalid durability");
+			unconsumed_dev_option = true;
+			break;
+		case O_version:
+			if (kstrtouint(optarg, 10, &opts.version))
+				die("invalid version");
+			break;
+		case O_no_initialize:
+			initialize = false;
+			break;
+		case O_no_opt:
+			darray_push(&device_paths, optarg);
+			dev_opts.path = optarg;
+			darray_push(&devices, dev_opts);
+			dev_opts.size = 0;
+			unconsumed_dev_option = false;
+			break;
+		case O_quiet:
+		case 'q':
+			quiet = true;
+			break;
+		case 'v':
+			verbose = true;
+		case O_help:
+		case 'h':
+			usage();
+			exit(EXIT_SUCCESS);
+			break;
+		case '?':
+			exit(EXIT_FAILURE);
+			break;
+		}
+
+	if (unconsumed_dev_option)
+		die("Options for devices apply to subsequent devices; got a device option with no device");
+
+	if (opts.version != bcachefs_metadata_version_current)
+		initialize = false;
+
+	if (!devices.nr)
+		die("Please supply a device");
+
+	if (opts.encrypted && !no_passphrase) {
+		opts.passphrase = read_passphrase_twice("Enter passphrase: ");
+		initialize = false;
+	}
+
+	darray_for_each(devices, dev) {
+		int ret = open_for_format(dev, force);
+		if (ret)
+			die("Error opening %s: %s", dev_opts.path, strerror(-ret));
+	}
+
+	struct bch_sb *sb =
+		bch2_format(fs_opt_strs,
+			    fs_opts,
+			    opts,
+			    devices.data, devices.nr);
+	bch2_opt_strs_free(&fs_opt_strs);
+
+	if (!quiet) {
+		struct printbuf buf = PRINTBUF;
+
+		buf.human_readable_units = true;
+
+		bch2_sb_to_text(&buf, sb, false, 1 << BCH_SB_FIELD_members_v2);
+		printf("%s", buf.buf);
+
+		printbuf_exit(&buf);
+	}
+	free(sb);
+
+	if (opts.passphrase) {
+		memzero_explicit(opts.passphrase, strlen(opts.passphrase));
+		free(opts.passphrase);
+	}
+
+	darray_exit(&devices);
+
+	if (initialize) {
+		struct bch_opts mount_opts = bch2_opts_empty();
+
+
+		opt_set(mount_opts, verbose, verbose);
+
+		/*
+		 * Start the filesystem once, to allocate the journal and create
+		 * the root directory:
+		 */
+		struct bch_fs *c = bch2_fs_open(device_paths.data,
+						device_paths.nr,
+						mount_opts);
+		if (IS_ERR(c))
+			die("error opening %s: %s", device_paths.data[0],
+			    bch2_err_str(PTR_ERR(c)));
+
+		bch2_fs_stop(c);
+	}
+
+	darray_exit(&device_paths);
+
+	return 0;
+}
+
+static void show_super_usage(void)
+{
+	puts("bcachefs show-super \n"
+	     "Usage: bcachefs show-super [OPTION].. device\n"
+	     "\n"
+	     "Options:\n"
+	     "  -f, --fields=(fields)       list of sections to print\n"
+	     "      --field-only=fiel)      print superblock section only, no header\n"
+	     "  -l, --layout                print superblock layout\n"
+	     "  -h, --help                  display this help and exit\n"
+	     "Report bugs to <linux-bcachefs@vger.kernel.org>");
+	exit(EXIT_SUCCESS);
+}
+
+int cmd_show_super(int argc, char *argv[])
+{
+	static const struct option longopts[] = {
+		{ "fields",			1, NULL, 'f' },
+		{ "field-only",			1, NULL, 'F' },
+		{ "layout",			0, NULL, 'l' },
+		{ "help",			0, NULL, 'h' },
+		{ NULL }
+	};
+	unsigned fields = 0;
+	int field_only = -1;
+	bool print_layout = false;
+	bool print_default_fields = true;
+	int opt;
+
+	while ((opt = getopt_long(argc, argv, "f:lh", longopts, NULL)) != -1)
+		switch (opt) {
+		case 'f':
+			fields = !strcmp(optarg, "all")
+				? ~0
+				: read_flag_list_or_die(optarg,
+					bch2_sb_fields, "superblock field");
+			print_default_fields = false;
+			break;
+		case 'F':
+			field_only = read_string_list_or_die(optarg,
+					bch2_sb_fields, "superblock field");
+			print_default_fields = false;
+			break;
+		case 'l':
+			print_layout = true;
+			break;
+		case 'h':
+			show_super_usage();
+			break;
+		}
+	args_shift(optind);
+
+	char *dev = arg_pop();
+	if (!dev)
+		die("please supply a device");
+	if (argc)
+		die("too many arguments");
+
+	struct bch_opts opts = bch2_opts_empty();
+
+	opt_set(opts, noexcl,	true);
+	opt_set(opts, nochanges, true);
+
+	struct bch_sb_handle sb;
+	int ret = bch2_read_super(dev, &opts, &sb);
+	if (ret)
+		die("Error opening %s: %s", dev, bch2_err_str(ret));
+
+	if (print_default_fields) {
+		fields |= bch2_sb_field_get(sb.sb, members_v2)
+			? 1 << BCH_SB_FIELD_members_v2
+			: 1 << BCH_SB_FIELD_members_v1;
+		fields |= 1 << BCH_SB_FIELD_errors;
+	}
+
+	struct printbuf buf = PRINTBUF;
+
+	buf.human_readable_units = true;
+
+	if (field_only >= 0) {
+		struct bch_sb_field *f = bch2_sb_field_get_id(sb.sb, field_only);
+
+		if (f)
+			__bch2_sb_field_to_text(&buf, sb.sb, f);
+	} else {
+		bch2_sb_to_text(&buf, sb.sb, print_layout, fields);
+	}
+	printf("%s", buf.buf);
+
+	bch2_free_super(&sb);
+	printbuf_exit(&buf);
+	return 0;
+}