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author | Coly Li <colyli@suse.de> | 2020-07-25 20:00:36 +0800 |
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committer | Jens Axboe <axboe@kernel.dk> | 2020-07-25 07:38:21 -0600 |
commit | 092bd54d69230b4a4a7f640a4cdcdeb004d3546e (patch) | |
tree | 9bd4a363c21ace95a6613db3eaf45cd390a62924 /drivers/md/bcache/features.c | |
parent | ffa470327572b8f85dceda48fd0676d9658cb8c5 (diff) | |
download | linux-stable-092bd54d69230b4a4a7f640a4cdcdeb004d3546e.tar.gz linux-stable-092bd54d69230b4a4a7f640a4cdcdeb004d3546e.tar.bz2 linux-stable-092bd54d69230b4a4a7f640a4cdcdeb004d3546e.zip |
bcache: add sysfs file to display feature sets information of cache set
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>
Diffstat (limited to 'drivers/md/bcache/features.c')
-rw-r--r-- | drivers/md/bcache/features.c | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/drivers/md/bcache/features.c b/drivers/md/bcache/features.c index ba53944bb390..4442df48d28c 100644 --- a/drivers/md/bcache/features.c +++ b/drivers/md/bcache/features.c @@ -8,6 +8,7 @@ */ #include <linux/bcache.h> #include "bcache.h" +#include "features.h" struct feature { int compat; @@ -20,3 +21,55 @@ static struct feature feature_list[] = { "large_bucket"}, {0, 0, 0 }, }; + +#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->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->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; +} |