bcachefs: bch2_opts_to_text()

Factor out bch2_show_options() into a generic helper, for debugging
option passing issues.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/fs.c

@@ -1930,30 +1930,14 @@ static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
 static int bch2_show_options(struct seq_file *seq, struct dentry *root)
 {
 	struct bch_fs *c = root->d_sb->s_fs_info;
-	enum bch_opt_id i;
 	struct printbuf buf = PRINTBUF;
-	int ret = 0;
-
-	for (i = 0; i < bch2_opts_nr; i++) {
-		const struct bch_option *opt = &bch2_opt_table[i];
-		u64 v = bch2_opt_get_by_id(&c->opts, i);
-
-		if ((opt->flags & OPT_HIDDEN) ||
-		    !(opt->flags & OPT_MOUNT))
-			continue;
 
-		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
-			continue;
-
-		printbuf_reset(&buf);
-		bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
-				 OPT_SHOW_MOUNT_STYLE);
-		seq_putc(seq, ',');
-		seq_puts(seq, buf.buf);
-	}
+	bch2_opts_to_text(&buf, c->opts, c, c->disk_sb.sb,
+			  OPT_MOUNT, OPT_HIDDEN, OPT_SHOW_MOUNT_STYLE);
+	printbuf_nul_terminate(&buf);
+	seq_puts(seq, buf.buf);
 
-	if (buf.allocation_failure)
-		ret = -ENOMEM;
+	int ret = buf.allocation_failure ? -ENOMEM : 0;
 	printbuf_exit(&buf);
 	return ret;
 }

fs/bcachefs/opts.c

@@ -443,6 +443,32 @@ void bch2_opt_to_text(struct printbuf *out,
 	}
 }
 
+void bch2_opts_to_text(struct printbuf *out,
+		       struct bch_opts opts,
+		       struct bch_fs *c, struct bch_sb *sb,
+		       unsigned show_mask, unsigned hide_mask,
+		       unsigned flags)
+{
+	bool first = true;
+
+	for (enum bch_opt_id i = 0; i < bch2_opts_nr; i++) {
+		const struct bch_option *opt = &bch2_opt_table[i];
+
+		if ((opt->flags & hide_mask) || !(opt->flags & show_mask))
+			continue;
+
+		u64 v = bch2_opt_get_by_id(&opts, i);
+		if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
+			continue;
+
+		if (!first)
+			prt_char(out, ',');
+		first = false;
+
+		bch2_opt_to_text(out, c, sb, opt, v, flags);
+	}
+}
+
 int bch2_opt_check_may_set(struct bch_fs *c, int id, u64 v)
 {
 	int ret = 0;

fs/bcachefs/opts.h

@@ -605,6 +605,10 @@ int bch2_opt_parse(struct bch_fs *, const struct bch_option *,
 
 void bch2_opt_to_text(struct printbuf *, struct bch_fs *, struct bch_sb *,
 		      const struct bch_option *, u64, unsigned);
+void bch2_opts_to_text(struct printbuf *,
+		       struct bch_opts,
+		       struct bch_fs *, struct bch_sb *,
+		       unsigned, unsigned, unsigned);
 
 int bch2_opt_check_may_set(struct bch_fs *, int, u64);
 int bch2_opts_check_may_set(struct bch_fs *);