From d3dc47271bc7a82b96e6441129058831835c0677 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kent.overstreet@gmail.com>
Date: Sun, 21 Mar 2021 16:12:26 -0400
Subject: [PATCH] Add format options for --no-initialize and specifying the
 metadata version

These are only to be used for tests.
---
 cmd_format.c  | 17 ++++++++++++++---
 libbcachefs.c |  4 ++--
 libbcachefs.h |  2 ++
 3 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/cmd_format.c b/cmd_format.c
index 673c63a7..bcd69783 100644
--- a/cmd_format.c
+++ b/cmd_format.c
@@ -41,6 +41,8 @@ x('g',	group,			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('h',	help,			no_argument)
@@ -112,7 +114,7 @@ int cmd_format(int argc, char *argv[])
 	darray(char *) device_paths;
 	struct format_opts opts	= format_opts_default();
 	struct dev_opts dev_opts = dev_opts_default(), *dev;
-	bool force = false, no_passphrase = false, quiet = false;
+	bool force = false, no_passphrase = false, quiet = false, initialize = true;
 	unsigned v;
 	int opt;
 
@@ -183,6 +185,13 @@ int cmd_format(int argc, char *argv[])
 			    dev_opts.durability > BCH_REPLICAS_MAX)
 				die("invalid durability");
 			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_append(device_paths, optarg);
 			dev_opts.path = optarg;
@@ -206,8 +215,10 @@ int cmd_format(int argc, char *argv[])
 	if (darray_empty(devices))
 		die("Please supply a device");
 
-	if (opts.encrypted && !no_passphrase)
+	if (opts.encrypted && !no_passphrase) {
 		opts.passphrase = read_passphrase_twice("Enter passphrase: ");
+		initialize = false;
+	}
 
 	darray_foreach(dev, devices)
 		dev->fd = open_for_format(dev->path, force);
@@ -229,7 +240,7 @@ int cmd_format(int argc, char *argv[])
 
 	darray_free(devices);
 
-	if (!opts.passphrase) {
+	if (initialize) {
 		/*
 		 * Start the filesystem once, to allocate the journal and create
 		 * the root directory:
diff --git a/libbcachefs.c b/libbcachefs.c
index 518c9624..9e7bc7d4 100644
--- a/libbcachefs.c
+++ b/libbcachefs.c
@@ -202,8 +202,8 @@ struct bch_sb *bch2_format(struct bch_opt_strs	fs_opt_strs,
 	if (bch2_sb_realloc(&sb, 0))
 		die("insufficient memory");
 
-	sb.sb->version		= le16_to_cpu(bcachefs_metadata_version_current);
-	sb.sb->version_min	= le16_to_cpu(bcachefs_metadata_version_current);
+	sb.sb->version		= le16_to_cpu(opts.version);
+	sb.sb->version_min	= le16_to_cpu(opts.version);
 	sb.sb->magic		= BCACHE_MAGIC;
 	sb.sb->block_size	= cpu_to_le16(fs_opts.block_size);
 	sb.sb->user_uuid	= opts.uuid;
diff --git a/libbcachefs.h b/libbcachefs.h
index 6ae24e9f..abc25ba0 100644
--- a/libbcachefs.h
+++ b/libbcachefs.h
@@ -30,6 +30,7 @@ void bch2_opts_usage(unsigned);
 struct format_opts {
 	char		*label;
 	uuid_le		uuid;
+	unsigned	version;
 
 	unsigned	encoded_extent_max;
 
@@ -40,6 +41,7 @@ struct format_opts {
 static inline struct format_opts format_opts_default()
 {
 	return (struct format_opts) {
+		.version		= bcachefs_metadata_version_current,
 		.encoded_extent_max	= 128,
 	};
 }