| // SPDX-License-Identifier: GPL-2.0 |
| /* |
| * Author: Coly Li <colyli@suse.de> |
| * |
| * Inspired by e2fsprogs features compat/incompat/ro_compat |
| * related code. |
| */ |
| #include <stdbool.h> |
| #include <stdint.h> |
| #include <stdio.h> |
| #include <sys/types.h> |
| #include <string.h> |
| |
| #include "bcache.h" |
| |
| struct feature { |
| int compat; |
| unsigned int mask; |
| const char *string; |
| }; |
| |
| static struct feature feature_list[] = { |
| {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET, |
| "obso_large_bucket"}, |
| {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, |
| "large_bucket"}, |
| {0, 0, 0 }, |
| }; |
| |
| #define compose_feature_string(type, header) \ |
| ({ \ |
| 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(sb, f->mask))) \ |
| continue; \ |
| \ |
| if (first) { \ |
| out += snprintf(out, buf + size - out, \ |
| "%s:\t", (header)); \ |
| first = false; \ |
| } else { \ |
| out += snprintf(out, buf + size - out, " "); \ |
| } \ |
| \ |
| out += snprintf(out, buf + size - out, "%s", f->string);\ |
| \ |
| } \ |
| if (!first) \ |
| out += snprintf(out, buf + size - out, "\n"); \ |
| }) |
| |
| void print_cache_set_supported_feature_sets(struct cache_sb *sb) |
| { |
| char buf[4096]; |
| char *out; |
| int size = sizeof(buf) - 1; |
| |
| out = buf; |
| memset(buf, 0, sizeof(buf)); |
| compose_feature_string(COMPAT, "sb.feature_compat"); |
| printf("%s", buf); |
| |
| out = buf; |
| memset(buf, 0, sizeof(buf)); |
| compose_feature_string(RO_COMPAT, "sb.feature_ro_compat"); |
| printf("%s", buf); |
| |
| out = buf; |
| memset(buf, 0, sizeof(buf)); |
| compose_feature_string(INCOMPAT, "sb.feature_incompat"); |
| printf("%s", buf); |
| } |