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092bd54d69
The following three sysfs files are created to display according feature
set information of bcache:
/sys/fs/bcache/<cache set UUID>/internal/feature_compat
/sys/fs/bcache/<cache set UUID>/internal/feature_ro_compat
/sys/fs/bcache/<cache set UUID>/internal/feature_incompat
is added by this patch, to display feature sets information of the cache
set.
Now only an incompat feature 'large_bucket' added in bcache, the sysfs
file content is:
[large_bucket]
string large_bucket means the running bcache drive supports incompat
feature 'large_bucket', the wrapping [] means the 'large_bucket' feature
is currently enabled on this cache set.
This patch is ready to display compat and ro_compat features, in future
once bcache code implements such feature sets, the according feature
strings will be displayed in their sysfs files too.
Signed-off-by: Coly Li <colyli@suse.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
// 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 <colyli@suse.de>
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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_LARGE_BUCKET,
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"large_bucket"},
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{0, 0, 0 },
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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->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->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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