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/*
* GFS2 glocks sysfs file statistics.
*
* Copyright (c) 2013 Red Hat.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include "glocks.h"
#include <ctype.h>
int
gfs2_glocks_fetch(int item, struct glocks *glocks, pmAtomValue *atom)
{
/* Check for valid metric count */
if (item < 0 || item >= NUM_GLOCKS_STATS)
return PM_ERR_PMID;
/* Check for no values recorded */
if(glocks->values[item] == UINT64_MAX)
return 0;
atom->ull = glocks->values[item];
return 1;
}
int
gfs2_refresh_glocks(const char *sysfs, const char *name, struct glocks *glocks)
{
char buffer[4096];
FILE *fp;
/* Reset all counter for this fs */
memset(glocks, 0, sizeof(*glocks));
snprintf(buffer, sizeof(buffer), "%s/%s/glocks", sysfs, name);
buffer[sizeof(buffer)-1] = '\0';
if ((fp = fopen(buffer, "r")) == NULL) {
/*
* We set the values to UINT64_MAX to signify we have no
* current values (no metric support or debugfs not mounted)
*
*/
memset(glocks, -1, sizeof(*glocks));
return -oserror();
}
/*
* Read through glocks file accumulating statistics as we go;
* as an early starting point, we're simply binning aggregate
* glock state counts.
*
*/
while (fgets(buffer, sizeof(buffer), fp) != NULL) {
char *p = buffer;
/* interested in glock lines only for now */
if (strncmp(p, "G:", 2) != 0)
continue;
for (p += 2; isspace((int)*p); p++) {;}
/* pick out the various state fields next */
if (strncmp(p, "s:SH", 4) == 0)
glocks->values[GLOCKS_SHARED]++;
else if (strncmp(p, "s:UN ", 4) == 0)
glocks->values[GLOCKS_UNLOCKED]++;
else if (strncmp(p, "s:DF ", 4) == 0)
glocks->values[GLOCKS_DEFERRED]++;
else if (strncmp(p, "s:EX", 4) == 0)
glocks->values[GLOCKS_EXCLUSIVE]++;
glocks->values[GLOCKS_TOTAL]++;
for (p += 4; isspace((int)*p); p++) {;}
/* [ extract any other field stats here ] */
}
fclose(fp);
return 0;
}
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