bcachefs: prt_bitflags_vector()

similar to prt_bitflags(), but for ulong arrays

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

Author: Kent Overstreet

fs/bcachefs/printbuf.c

@@ -1,6 +1,7 @@
 // SPDX-License-Identifier: LGPL-2.1+
 /* Copyright (C) 2022 Kent Overstreet */
 
+#include <linux/bitmap.h>
 #include <linux/err.h>
 #include <linux/export.h>
 #include <linux/kernel.h>
@@ -423,3 +424,24 @@ void bch2_prt_bitflags(struct printbuf *out,
 		flags ^= BIT_ULL(bit);
 	}
 }
+
+void bch2_prt_bitflags_vector(struct printbuf *out,
+			      const char * const list[],
+			      unsigned long *v, unsigned nr)
+{
+	bool first = true;
+	unsigned i;
+
+	for (i = 0; i < nr; i++)
+		if (!list[i]) {
+			nr = i - 1;
+			break;
+		}
+
+	for_each_set_bit(i, v, nr) {
+		if (!first)
+			bch2_prt_printf(out, ",");
+		first = false;
+		bch2_prt_printf(out, "%s", list[i]);
+	}
+}

fs/bcachefs/printbuf.h

@@ -124,6 +124,8 @@ void bch2_prt_units_u64(struct printbuf *, u64);
 void bch2_prt_units_s64(struct printbuf *, s64);
 void bch2_prt_string_option(struct printbuf *, const char * const[], size_t);
 void bch2_prt_bitflags(struct printbuf *, const char * const[], u64);
+void bch2_prt_bitflags_vector(struct printbuf *, const char * const[],
+			      unsigned long *, unsigned);
 
 /* Initializer for a heap allocated printbuf: */
 #define PRINTBUF ((struct printbuf) { .heap_allocated = true })

fs/bcachefs/util.h

@@ -243,6 +243,7 @@ do {									\
 #define prt_units_s64(...)		bch2_prt_units_s64(__VA_ARGS__)
 #define prt_string_option(...)		bch2_prt_string_option(__VA_ARGS__)
 #define prt_bitflags(...)		bch2_prt_bitflags(__VA_ARGS__)
+#define prt_bitflags_vector(...)	bch2_prt_bitflags_vector(__VA_ARGS__)
 
 void bch2_pr_time_units(struct printbuf *, u64);
 void bch2_prt_datetime(struct printbuf *, time64_t);