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/*
* GFS2 glstats 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 "glstats.h"
/*
* GFS2 glock type identification; note that the glock type 7 is currently not
* used and is reserved to be on the safe side.
*
* Type Lock type Use
* 1 Trans Transaction lock
* 2 Inode Inode metadata and data
* 3 Rgrp Resource group metadata
* 4 Meta The superblock
* 5 Iopen Inode last closer detection
* 6 Flock flock(2) syscall
* 8 Quota Quota operations
* 9 Journal Journal mutex
*
*/
int
gfs2_glstats_fetch(int item, struct glstats *glstats, pmAtomValue *atom)
{
/* Handle the case for our reserved but not used glock type 7 */
if ((item < 0 || item >= NUM_GLSTATS_STATS) && item != 7)
return PM_ERR_PMID;
/* Check for no values recorded */
if(glstats->values[item] == UINT64_MAX)
return 0;
atom->ull = glstats->values[item];
return 1;
}
int
gfs2_refresh_glstats(const char *sysfs, const char *name, struct glstats *glstats){
char buffer[4096];
FILE *fp;
/* Reset all counter for this fs */
memset(glstats, 0, sizeof(*glstats));
snprintf(buffer, sizeof(buffer), "%s/%s/glstats", 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(glstats, -1, sizeof(*glstats));
return -oserror();
}
/*
* We read through the glstats file, finding out what glock types we are
* coming across and tally up the number of each type of glock we find.
* This file however contains the total number of locks at this time,
* on a large, heavy utilized filesystem there could be millions of entries
* so needs to be quick and efficient.
*
*/
while(fgets(buffer, sizeof(buffer), fp) != NULL){
char *p = buffer;
/* We pick out the various glock types by the identifying number */
if (strncmp(p, "G: n:1", 6) == 0){
glstats->values[GLSTATS_TRANS]++;
} else if (strncmp(p, "G: n:2 ", 6) == 0){
glstats->values[GLSTATS_INODE]++;
} else if (strncmp(p, "G: n:3 ", 6) == 0){
glstats->values[GLSTATS_RGRP]++;
} else if (strncmp(p, "G: n:4 ", 6) == 0){
glstats->values[GLSTATS_META]++;
} else if (strncmp(p, "G: n:5 ", 6) == 0){
glstats->values[GLSTATS_IOPEN]++;
} else if (strncmp(p, "G: n:6 ", 6) == 0){
glstats->values[GLSTATS_FLOCK]++;
} else if (strncmp(p, "G: n:8 ", 6) == 0){
glstats->values[GLSTATS_QUOTA]++;
} else if (strncmp(p, "G: n:9 ", 6) == 0){
glstats->values[GLSTATS_JOURNAL]++;
}
glstats->values[GLSTATS_TOTAL]++;
/*
* We advance the cursor for after we read what type of lock we have
* for (p += 6; isspace((int)*p); p++) {;}
*
* [ We can extract any other future fields from here on]
*
*/
}
fclose(fp);
return 0;
}
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