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1// SPDX-License-Identifier: GPL-2.02/*3 * Feature set bits and string conversion.4 * Inspired by ext4's features compat/incompat/ro_compat related code.5 *6 * Copyright 2020 Coly Li <colyli@suse.de>7 *8 */9#include "bcache_ondisk.h"10#include "bcache.h"11#include "features.h"12 13struct feature {14 int compat;15 unsigned int mask;16 const char *string;17};18 19static struct feature feature_list[] = {20 {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE,21 "large_bucket"},22 {0, 0, NULL },23};24 25#define compose_feature_string(type) \26({ \27 struct feature *f; \28 bool first = true; \29 \30 for (f = &feature_list[0]; f->compat != 0; f++) { \31 if (f->compat != BCH_FEATURE_ ## type) \32 continue; \33 if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \34 if (first) { \35 out += snprintf(out, buf + size - out, \36 "["); \37 } else { \38 out += snprintf(out, buf + size - out, \39 " ["); \40 } \41 } else if (!first) { \42 out += snprintf(out, buf + size - out, " "); \43 } \44 \45 out += snprintf(out, buf + size - out, "%s", f->string);\46 \47 if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \48 out += snprintf(out, buf + size - out, "]"); \49 \50 first = false; \51 } \52 if (!first) \53 out += snprintf(out, buf + size - out, "\n"); \54})55 56int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size)57{58 char *out = buf;59 compose_feature_string(COMPAT);60 return out - buf;61}62 63int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size)64{65 char *out = buf;66 compose_feature_string(RO_COMPAT);67 return out - buf;68}69 70int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size)71{72 char *out = buf;73 compose_feature_string(INCOMPAT);74 return out - buf;75}76