| 1 | |
| 2 | |
| 3 | * Feature set bits and string conversion.
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| 4 | * Inspired by ext4's features compat/incompat/ro_compat related code.
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| 5 | *
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| 6 | * Copyright 2020 Coly Li <[email protected]>
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| 7 | *
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| 8 |
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| 9 | #include "bcache_ondisk.h"
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| 10 | #include "bcache.h"
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| 11 | #include "features.h"
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| 12 |
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| 13 | struct feature {
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| 14 | int compat;
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| 15 | unsigned int mask;
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| 16 | const char *string;
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| 17 | };
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| 18 |
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| 19 | static struct feature feature_list[] = {
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| 20 | {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE,
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| 21 | "large_bucket"},
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| 22 | {0, 0, NULL },
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| 23 | };
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| 24 |
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| 25 | #define compose_feature_string(type) \
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| 26 | ({ \
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| 27 | struct feature *f; \
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| 28 | bool first = true; \
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| 29 | \
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| 30 | for (f = &feature_list[0]; f->compat != 0; f++) { \
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| 31 | if (f->compat != BCH_FEATURE_ ## type) \
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| 32 | continue; \
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| 33 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) { \
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| 34 | if (first) { \
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| 35 | out += snprintf(out, buf + size - out, \
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| 36 | "["); \
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| 37 | } else { \
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| 38 | out += snprintf(out, buf + size - out, \
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| 39 | " ["); \
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| 40 | } \
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| 41 | } else if (!first) { \
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| 42 | out += snprintf(out, buf + size - out, " "); \
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| 43 | } \
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| 44 | \
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| 45 | out += snprintf(out, buf + size - out, "%s", f->string);\
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| 46 | \
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| 47 | if (BCH_HAS_ ## type ## _FEATURE(&c->cache->sb, f->mask)) \
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| 48 | out += snprintf(out, buf + size - out, "]"); \
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| 49 | \
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| 50 | first = false; \
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| 51 | } \
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| 52 | if (!first) \
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| 53 | out += snprintf(out, buf + size - out, "\n"); \
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| 54 | })
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| 55 |
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| 56 | int bch_print_cache_set_feature_compat(struct cache_set *c, char *buf, int size)
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| 57 | {
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| 58 | char *out = buf;
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| 59 | compose_feature_string(COMPAT);
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| 60 | return out - buf;
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| 61 | }
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| 62 |
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| 63 | int bch_print_cache_set_feature_ro_compat(struct cache_set *c, char *buf, int size)
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| 64 | {
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| 65 | char *out = buf;
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| 66 | compose_feature_string(RO_COMPAT);
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| 67 | return out - buf;
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| 68 | }
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| 69 |
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| 70 | int bch_print_cache_set_feature_incompat(struct cache_set *c, char *buf, int size)
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| 71 | {
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| 72 | char *out = buf;
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| 73 | compose_feature_string(INCOMPAT);
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| 74 | return out - buf;
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| 75 | }
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