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75 lines
1.8 KiB
75 lines
1.8 KiB
// SPDX-License-Identifier: GPL-2.0 |
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/* |
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* Feature set bits and string conversion. |
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* Inspired by ext4's features compat/incompat/ro_compat related code. |
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* |
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* Copyright 2020 Coly Li <[email protected]> |
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* |
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*/ |
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#include <linux/bcache.h> |
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#include "bcache.h" |
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#include "features.h" |
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struct feature { |
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int compat; |
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unsigned int mask; |
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const char *string; |
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}; |
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static struct feature feature_list[] = { |
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{BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, |
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"large_bucket"}, |
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{0, 0, NULL }, |
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}; |
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#define compose_feature_string(type) \ |
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({ \ |
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struct feature *f; \ |
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bool first = true; \ |
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\ |
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for (f = &feature_list[0]; f->compat != 0; f++) { \ |
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if (f->compat != BCH_FEATURE_ ## type) \ |
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continue; \ |
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if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \ |
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if (first) { \ |
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out += snprintf(out, buf + size - out, \ |
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"["); \ |
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} else { \ |
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out += snprintf(out, buf + size - out, \ |
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" ["); \ |
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} \ |
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} else if (!first) { \ |
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out += snprintf(out, buf + size - out, " "); \ |
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} \ |
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\ |
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out += snprintf(out, buf + size - out, "%s", f->string);\ |
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\ |
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if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \ |
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out += snprintf(out, buf + size - out, "]"); \ |
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\ |
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first = false; \ |
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} \ |
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if (!first) \ |
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out += snprintf(out, buf + size - out, "\n"); \ |
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}) |
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int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size) |
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{ |
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char *out = buf; |
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compose_feature_string(COMPAT); |
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return out - buf; |
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} |
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int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size) |
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{ |
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char *out = buf; |
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compose_feature_string(RO_COMPAT); |
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return out - buf; |
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} |
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int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size) |
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{ |
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char *out = buf; |
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compose_feature_string(INCOMPAT); |
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return out - buf; |
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}
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