diff --git a/fs/bcachefs/opts.c b/fs/bcachefs/opts.c
index e10fc1da71b1..8e2fd064b50f 100644
--- a/fs/bcachefs/opts.c
+++ b/fs/bcachefs/opts.c
@@ -230,6 +230,8 @@ const struct bch_option bch2_opt_table[] = {
 #define OPT_STR_NOLIMIT(_choices)	.type = BCH_OPT_STR,		\
 				.min = 0, .max = U64_MAX,		\
 				.choices = _choices
+#define OPT_BITFIELD(_choices)	.type = BCH_OPT_BITFIELD,		\
+				.choices = _choices
 #define OPT_FN(_fn)		.type = BCH_OPT_FN, .fn	= _fn
 
 #define x(_name, _bits, _flags, _type, _sb_opt, _default, _hint, _help)	\
@@ -376,6 +378,13 @@ int bch2_opt_parse(struct bch_fs *c,
 
 		*res = ret;
 		break;
+	case BCH_OPT_BITFIELD: {
+		s64 v = bch2_read_flag_list(val, opt->choices);
+		if (v < 0)
+			return v;
+		*res = v;
+		break;
+	}
 	case BCH_OPT_FN:
 		ret = opt->fn.parse(c, val, res, err);
 
diff --git a/fs/bcachefs/opts.h b/fs/bcachefs/opts.h
index cda1725702ea..1c7b68b25bb7 100644
--- a/fs/bcachefs/opts.h
+++ b/fs/bcachefs/opts.h
@@ -70,6 +70,7 @@ enum opt_type {
 	BCH_OPT_BOOL,
 	BCH_OPT_UINT,
 	BCH_OPT_STR,
+	BCH_OPT_BITFIELD,
 	BCH_OPT_FN,
 };
 
@@ -477,6 +478,11 @@ enum fsck_err_opts {
 	  BCH2_NO_SB_OPT,		1,				\
 	  "n",		"Data written to this device will be considered\n"\
 			"to have already been replicated n times")	\
+	x(data_allowed,			u8,				\
+	  OPT_DEVICE,							\
+	  OPT_BITFIELD(__bch2_data_types),				\
+	  BCH2_NO_SB_OPT,		BIT(BCH_DATA_journal)|BIT(BCH_DATA_btree)|BIT(BCH_DATA_user),\
+	  "types",	"Allowed data types for this device: journal, btree, and/or user")\
 	x(btree_node_prefetch,		u8,				\
 	  OPT_FS|OPT_MOUNT|OPT_RUNTIME,					\
 	  OPT_BOOL(),							\
diff --git a/fs/bcachefs/util.c b/fs/bcachefs/util.c
index 144d8df48b1e..8b4e8395a908 100644
--- a/fs/bcachefs/util.c
+++ b/fs/bcachefs/util.c
@@ -204,7 +204,7 @@ STRTO_H(strtoll, long long)
 STRTO_H(strtoull, unsigned long long)
 STRTO_H(strtou64, u64)
 
-u64 bch2_read_flag_list(char *opt, const char * const list[])
+u64 bch2_read_flag_list(const char *opt, const char * const list[])
 {
 	u64 ret = 0;
 	char *p, *s, *d = kstrdup(opt, GFP_KERNEL);
diff --git a/fs/bcachefs/util.h b/fs/bcachefs/util.h
index 902b7f5406a2..fb02c1c36004 100644
--- a/fs/bcachefs/util.h
+++ b/fs/bcachefs/util.h
@@ -195,7 +195,7 @@ static inline int bch2_strtoul_h(const char *cp, long *res)
 
 bool bch2_is_zero(const void *, size_t);
 
-u64 bch2_read_flag_list(char *, const char * const[]);
+u64 bch2_read_flag_list(const char *, const char * const[]);
 
 void bch2_prt_u64_base2_nbits(struct printbuf *, u64, unsigned);
 void bch2_prt_u64_base2(struct printbuf *, u64);