bcachefs: Replace ERANGE with private error codes

We avoid using standard error codes: private, per-callsite error codes
make debugging easier.
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/errcode.h

@@ -3,6 +3,8 @@
 #define _BCACHEFS_ERRCODE_H
 
 #define BCH_ERRCODES()								\
+	x(ERANGE,			ERANGE_option_too_small)		\
+	x(ERANGE,			ERANGE_option_too_big)			\
 	x(ENOMEM,			ENOMEM_stripe_buf)			\
 	x(ENOMEM,			ENOMEM_replicas_table)			\
 	x(ENOMEM,			ENOMEM_cpu_replicas)			\

fs/bcachefs/opts.c

@@ -265,14 +265,14 @@ int bch2_opt_validate(const struct bch_option *opt, u64 v, struct printbuf *err)
 		if (err)
 			prt_printf(err, "%s: too small (min %llu)",
 			       opt->attr.name, opt->min);
-		return -ERANGE;
+		return -BCH_ERR_ERANGE_option_too_small;
 	}
 
 	if (opt->max && v >= opt->max) {
 		if (err)
 			prt_printf(err, "%s: too big (max %llu)",
 			       opt->attr.name, opt->max);
-		return -ERANGE;
+		return -BCH_ERR_ERANGE_option_too_big;
 	}
 
 	if ((opt->flags & OPT_SB_FIELD_SECTORS) && (v & 511)) {