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#define _POSIX_C_SOURCE 200809L
#include <string.h>
#include <sys/statvfs.h>
#include "filesystem.h"
#include "util.h"
// size of input buffer for paths and lines
#define BUF_SIZE 256
static void filesystem_collect(scrape_req *req, void *ctx);
const struct collector filesystem_collector = {
.name = "filesystem",
.collect = filesystem_collect,
};
static void filesystem_collect(scrape_req *req, void *ctx) {
// buffers
const char *labels[][2] = { // all filled by code
{ "device", 0 },
{ "fstype", 0 },
{ "mountpoint", 0 },
{ 0, 0 },
};
const char **dev = &labels[0][1];
const char **fstype = &labels[1][1];
const char **mount = &labels[2][1];
char buf[BUF_SIZE];
FILE *f;
struct statvfs fs;
// loop over /proc/mounts to get visible mounts
f = fopen("/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 (**dev != '/')
continue;
// TODO: device, mountpoint, filesystem exclude lists
// report metrics from statfs
if (statvfs(*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);
}
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