bcachefs: x-macro metadata version enum

Now we've got strings for metadata versions - this changes
bch2_sb_to_text() and our mount log message to use it.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>

fs/bcachefs/bcachefs_format.h

@@ -1279,19 +1279,23 @@ struct bch_sb_field_journal_seq_blacklist {
 #define BCH_JSET_VERSION_OLD			2
 #define BCH_BSET_VERSION_OLD			3
 
+#define BCH_METADATA_VERSIONS()				\
+	x(bkey_renumber,		10)		\
+	x(inode_btree_change,		11)		\
+	x(snapshot,			12)		\
+	x(inode_backpointers,		13)		\
+	x(btree_ptr_sectors_written,	14)		\
+	x(snapshot_2,			15)		\
+	x(reflink_p_fix,		16)		\
+	x(subvol_dirent,		17)		\
+	x(inode_v2,			18)
+
 enum bcachefs_metadata_version {
 	bcachefs_metadata_version_min = 9,
-	bcachefs_metadata_version_new_versioning	= 10,
-	bcachefs_metadata_version_bkey_renumber		= 10,
-	bcachefs_metadata_version_inode_btree_change	= 11,
-	bcachefs_metadata_version_snapshot		= 12,
-	bcachefs_metadata_version_inode_backpointers	= 13,
-	bcachefs_metadata_version_btree_ptr_sectors_written = 14,
-	bcachefs_metadata_version_snapshot_2		= 15,
-	bcachefs_metadata_version_reflink_p_fix		= 16,
-	bcachefs_metadata_version_subvol_dirent		= 17,
-	bcachefs_metadata_version_inode_v2		= 18,
-	bcachefs_metadata_version_max			= 19,
+#define x(t, n)	bcachefs_metadata_version_##t = n,
+	BCH_METADATA_VERSIONS()
+#undef x
+	bcachefs_metadata_version_max
 };
 
 #define bcachefs_metadata_version_current	(bcachefs_metadata_version_max - 1)

fs/bcachefs/btree_io.c

@@ -1887,7 +1887,7 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b, unsigned flags)
 	BUG_ON(BSET_BIG_ENDIAN(i) != CPU_BIG_ENDIAN);
 	BUG_ON(i->seq != b->data->keys.seq);
 
-	i->version = c->sb.version < bcachefs_metadata_version_new_versioning
+	i->version = c->sb.version < bcachefs_metadata_version_bkey_renumber
 		? cpu_to_le16(BCH_BSET_VERSION_OLD)
 		: cpu_to_le16(c->sb.version);
 	SET_BSET_OFFSET(i, b->written);

fs/bcachefs/journal_io.c

@@ -1574,7 +1574,7 @@ void bch2_journal_write(struct closure *cl)
 	BUG_ON(vstruct_sectors(jset, c->block_bits) > w->sectors);
 
 	jset->magic		= cpu_to_le64(jset_magic(c));
-	jset->version		= c->sb.version < bcachefs_metadata_version_new_versioning
+	jset->version		= c->sb.version < bcachefs_metadata_version_bkey_renumber
 		? cpu_to_le32(BCH_JSET_VERSION_OLD)
 		: cpu_to_le32(c->sb.version);
 

fs/bcachefs/opts.c

@@ -9,7 +9,12 @@
 #include "super-io.h"
 #include "util.h"
 
-#define x(t, n) #t,
+#define x(t, n) [n] = #t,
+
+const char * const bch2_metadata_versions[] = {
+	BCH_METADATA_VERSIONS()
+	NULL
+};
 
 const char * const bch2_error_actions[] = {
 	BCH_ERROR_ACTIONS()

fs/bcachefs/opts.h

@@ -8,6 +8,7 @@
 #include <linux/sysfs.h>
 #include "bcachefs_format.h"
 
+extern const char * const bch2_metadata_versions[];
 extern const char * const bch2_error_actions[];
 extern const char * const bch2_sb_features[];
 extern const char * const bch2_sb_compat[];

fs/bcachefs/super-io.c

@@ -263,7 +263,7 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out)
 	int ret;
 
 	version		= le16_to_cpu(sb->version);
-	version_min	= version >= bcachefs_metadata_version_new_versioning
+	version_min	= version >= bcachefs_metadata_version_bkey_renumber
 		? le16_to_cpu(sb->version_min)
 		: version;
 
@@ -518,7 +518,7 @@ static int read_one_super(struct bch_sb_handle *sb, u64 offset, struct printbuf
 	}
 
 	version		= le16_to_cpu(sb->sb->version);
-	version_min	= version >= bcachefs_metadata_version_new_versioning
+	version_min	= version >= bcachefs_metadata_version_bkey_renumber
 		? le16_to_cpu(sb->sb->version_min)
 		: version;
 
@@ -1552,12 +1552,12 @@ void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 
 	pr_buf(out, "Version:");
 	pr_tab(out);
-	pr_buf(out, "%u", le16_to_cpu(sb->version));
+	pr_buf(out, "%s", bch2_metadata_versions[le16_to_cpu(sb->version)]);
 	pr_newline(out);
 
 	pr_buf(out, "Oldest version on disk:");
 	pr_tab(out);
-	pr_buf(out, "%u", le16_to_cpu(sb->version_min));
+	pr_buf(out, "%u", bch2_metadata_versions[le16_to_cpu(sb->version_min)]);
 	pr_newline(out);
 
 	pr_buf(out, "Created:");

fs/bcachefs/super.c

@@ -897,7 +897,7 @@ static void print_mount_opts(struct bch_fs *c)
 	if (!p.pos)
 		pr_buf(&p, "(null)");
 
-	bch_info(c, "mounted with opts: %s", p.buf);
+	bch_info(c, "mounted version=%s opts=%s", bch2_metadata_versions[c->sb.version], p.buf);
 	printbuf_exit(&p);
 }