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/*
* Copyright 2018 Google LLC
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* https://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _POSIX_C_SOURCE 200809L
#include <string.h>
#include <sys/statvfs.h>
#include "scrape.h"
#include "util.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
static void *filesystem_init(int argc, char *argv[]);
static void filesystem_collect(scrape_req *req, void *ctx);
const struct collector filesystem_collector = {
.name = "filesystem",
.collect = filesystem_collect,
.init = filesystem_init,
.has_args = true,
};
struct filesystem_context {
struct slist *include_device;
struct slist *exclude_device;
struct slist *include_mount;
struct slist *exclude_mount;
struct slist *include_type;
struct slist *exclude_type;
int (*statvfs_func)(const char *path, struct statvfs *buf);
};
static void *filesystem_init(int argc, char *argv[]) {
struct filesystem_context *ctx = must_malloc(sizeof *ctx);
ctx->include_device = 0;
ctx->exclude_device = 0;
ctx->include_mount = 0;
ctx->exclude_mount = 0;
ctx->include_type = 0;
ctx->exclude_type = 0;
for (int arg = 0; arg < argc; arg++) {
if (strncmp(argv[arg], "include-device=", 15) == 0) {
ctx->include_device = slist_split(&argv[arg][15], ",");
} else if (strncmp(argv[arg], "exclude-device=", 15) == 0) {
ctx->exclude_device = slist_split(&argv[arg][15], ",");
} else if (strncmp(argv[arg], "include-mount=", 14) == 0) {
ctx->include_mount = slist_split(&argv[arg][14], ",");
} else if (strncmp(argv[arg], "exclude-mount=", 14) == 0) {
ctx->exclude_mount = slist_split(&argv[arg][14], ",");
} else if (strncmp(argv[arg], "include-type=", 13) == 0) {
ctx->include_type = slist_split(&argv[arg][13], ",");
} else if (strncmp(argv[arg], "exclude-type=", 13) == 0) {
ctx->exclude_type = slist_split(&argv[arg][13], ",");
} else {
fprintf(stderr, "unknown argument for filesystem collector: %s", argv[arg]);
return 0;
}
}
ctx->statvfs_func = statvfs;
return ctx;
}
static void filesystem_collect(scrape_req *req, void *ctx_ptr) {
struct filesystem_context *ctx = ctx_ptr;
// buffers
struct label labels[] = { // all values filled by code
{ .key = "device", .value = 0 },
{ .key = "fstype", .value = 0 },
{ .key = "mountpoint", .value = 0 },
LABEL_END,
};
char **dev = &labels[0].value;
char **fstype = &labels[1].value;
char **mount = &labels[2].value;
char buf[BUF_SIZE];
FILE *f;
struct statvfs fs;
// loop over /proc/mounts to get visible mounts
f = fopen(PATH("/proc/mounts"), "r");
if (!f)
return;
while (fgets_line(buf, sizeof buf, f)) {
// extract device, mountpoint and filesystem type
char *p;
*dev = strtok_r(buf, " ", &p);
if (!*dev)
continue;
*mount = strtok_r(0, " ", &p);
if (!*mount)
continue;
*fstype = strtok_r(0, " ", &p);
if (!*fstype)
continue;
if (ctx->include_device) {
if (!slist_matches(ctx->include_device, *dev))
continue;
} else {
if (**dev != '/')
continue;
if (ctx->exclude_device && slist_matches(ctx->exclude_device, *dev))
continue;
}
if (ctx->include_mount) {
if (!slist_matches(ctx->include_mount, *mount))
continue;
} else if (ctx->exclude_mount) {
if (slist_matches(ctx->exclude_mount, *mount))
continue;
}
if (ctx->include_type) {
if (!slist_matches(ctx->include_type, *fstype))
continue;
} else if (ctx->exclude_type) {
if (slist_matches(ctx->exclude_type, *fstype))
continue;
}
// report metrics from statfs
if (ctx->statvfs_func(*mount, &fs) != 0)
continue;
double bs = fs.f_frsize;
scrape_write(req, "node_filesystem_avail_bytes", labels, fs.f_bavail * bs);
scrape_write(req, "node_filesystem_files", labels, fs.f_files);
scrape_write(req, "node_filesystem_files_free", labels, fs.f_ffree);
scrape_write(req, "node_filesystem_free_bytes", labels, fs.f_bfree * bs);
scrape_write(req, "node_filesystem_readonly", labels, fs.f_flag & ST_RDONLY ? 1.0 : 0.0);
scrape_write(req, "node_filesystem_size_bytes", labels, fs.f_blocks * bs);
}
fclose(f);
}
#ifdef NANO_EXPORTER_TEST
void filesystem_test_override_statvfs(void *ctx, int (*statvfs_func)(const char *path, struct statvfs *buf)) {
((struct filesystem_context *) ctx)->statvfs_func = statvfs_func;
}
#endif // NANO_EXPORTER_TEST
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