// SPDX-License-Identifier: GPL-2.0
/*
 * Feature set bits and string conversion.
 * Inspired by ext4's features compat/incompat/ro_compat related code.
 *
 * Copyright 2020 Coly Li <colyli@suse.de>
 *
 */
#include "bcache_ondisk.h"
#include "bcache.h"
#include "features.h"

struct feature {
        int             compat;
        unsigned int    mask;
        const char      *string;
};

static struct feature feature_list[] = {
        {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE,
                "large_bucket"},
        {0, 0, NULL },
};

#define compose_feature_string(type)                            \
({                                                                      \
        struct feature *f;                                              \
        bool first = true;                                              \
                                                                        \
        for (f = &feature_list[0]; f->compat != 0; f++) {               \
                if (f->compat != BCH_FEATURE_ ## type)                  \
                        continue;                                       \
                if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) {     \
                        if (first) {                                    \
                                out += snprintf(out, buf + size - out,  \
                                                "[");   \
                        } else {                                        \
                                out += snprintf(out, buf + size - out,  \
                                                " [");                  \
                        }                                               \
                } else if (!first) {                                    \
                        out += snprintf(out, buf + size - out, " ");    \
                }                                                       \
                                                                        \
                out += snprintf(out, buf + size - out, "%s", f->string);\
                                                                        \
                if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask))       \
                        out += snprintf(out, buf + size - out, "]");    \
                                                                        \
                first = false;                                          \
        }                                                               \
        if (!first)                                                     \
                out += snprintf(out, buf + size - out, "\n");           \
})

int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size)
{
        char *out = buf;
        compose_feature_string(COMPAT);
        return out - buf;
}

int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size)
{
        char *out = buf;
        compose_feature_string(RO_COMPAT);
        return out - buf;
}

int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size)
{
        char *out = buf;
        compose_feature_string(INCOMPAT);
        return out - buf;
}