--- /dev/null
+/**
+ * collectd - src/fscache.c
+ * Copyright (C) 2009 Edward "Koko" Konetzko
+ *
+ * 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; only version 2 of the License is applicable.
+ *
+ * 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Authors:
+ * Edward "Koko" Konetzko <konetzed at quixoticagony.com>
+ **/
+
+#include "collectd.h"
+#include "common.h"
+#include "plugin.h"
+#include <stdio.h> /* a header needed for FILE */
+#include <string.h> /* a header needed for scanf function */
+#include <stdlib.h> /* used for atoi */
+
+
+#if !KERNEL_LINUX
+# error "This module only supports the Linux implementation of fscache"
+#endif
+
+#define BUFSIZE 1024
+
+/*
+see /proc/fs/fscache/stats
+see Documentation/filesystems/caching/fscache.txt in linux kernel >= 2.6.30
+
+This shows counts of a number of events that can happen in FS-Cache:
+
+CLASS EVENT MEANING
+======= ======= =======================================================
+Cookies idx=N Number of index cookies allocated
+ dat=N Number of data storage cookies allocated
+ spc=N Number of special cookies allocated
+Objects alc=N Number of objects allocated
+ nal=N Number of object allocation failures
+ avl=N Number of objects that reached the available state
+ ded=N Number of objects that reached the dead state
+ChkAux non=N Number of objects that didn't have a coherency check
+ ok=N Number of objects that passed a coherency check
+ upd=N Number of objects that needed a coherency data update
+ obs=N Number of objects that were declared obsolete
+Pages mrk=N Number of pages marked as being cached
+ unc=N Number of uncache page requests seen
+Acquire n=N Number of acquire cookie requests seen
+ nul=N Number of acq reqs given a NULL parent
+ noc=N Number of acq reqs rejected due to no cache available
+ ok=N Number of acq reqs succeeded
+ nbf=N Number of acq reqs rejected due to error
+ oom=N Number of acq reqs failed on ENOMEM
+Lookups n=N Number of lookup calls made on cache backends
+ neg=N Number of negative lookups made
+ pos=N Number of positive lookups made
+ crt=N Number of objects created by lookup
+Updates n=N Number of update cookie requests seen
+ nul=N Number of upd reqs given a NULL parent
+ run=N Number of upd reqs granted CPU time
+Relinqs n=N Number of relinquish cookie requests seen
+ nul=N Number of rlq reqs given a NULL parent
+ wcr=N Number of rlq reqs waited on completion of creation
+AttrChg n=N Number of attribute changed requests seen
+ ok=N Number of attr changed requests queued
+ nbf=N Number of attr changed rejected -ENOBUFS
+ oom=N Number of attr changed failed -ENOMEM
+ run=N Number of attr changed ops given CPU time
+Allocs n=N Number of allocation requests seen
+ ok=N Number of successful alloc reqs
+ wt=N Number of alloc reqs that waited on lookup completion
+ nbf=N Number of alloc reqs rejected -ENOBUFS
+ ops=N Number of alloc reqs submitted
+ owt=N Number of alloc reqs waited for CPU time
+Retrvls n=N Number of retrieval (read) requests seen
+ ok=N Number of successful retr reqs
+ wt=N Number of retr reqs that waited on lookup completion
+ nod=N Number of retr reqs returned -ENODATA
+ nbf=N Number of retr reqs rejected -ENOBUFS
+ int=N Number of retr reqs aborted -ERESTARTSYS
+ oom=N Number of retr reqs failed -ENOMEM
+ ops=N Number of retr reqs submitted
+ owt=N Number of retr reqs waited for CPU time
+Stores n=N Number of storage (write) requests seen
+ ok=N Number of successful store reqs
+ agn=N Number of store reqs on a page already pending storage
+ nbf=N Number of store reqs rejected -ENOBUFS
+ oom=N Number of store reqs failed -ENOMEM
+ ops=N Number of store reqs submitted
+ run=N Number of store reqs granted CPU time
+Ops pend=N Number of times async ops added to pending queues
+ run=N Number of times async ops given CPU time
+ enq=N Number of times async ops queued for processing
+ dfr=N Number of async ops queued for deferred release
+ rel=N Number of async ops released
+ gc=N Number of deferred-release async ops garbage collected
+
+63 events to collect in 13 groups
+*/
+
+static int fscache_number_of_values = 62;
+
+struct fscache_values {
+ char name[20];
+ unsigned long long value;
+}; /*end struct fscache_values */
+
+static void fscache_submit(struct fscache_values submit_values[]){
+/*submit logic goes here!!!!!*/
+
+ value_t values[1];
+ value_list_t vl = VALUE_LIST_INIT;
+ int i;
+
+ vl.values = values;
+ vl.values_len = 1;
+ sstrncpy(vl.host, hostname_g, sizeof(vl.host));
+ sstrncpy(vl.plugin, "fscache", sizeof(vl.plugin));
+ sstrncpy(vl.plugin_instance, "fscache",
+ sizeof(vl.plugin_instance));
+ sstrncpy(vl.type, "fscache_stat", sizeof(vl.type));
+
+ for (i = 0; i < fscache_number_of_values; i++){
+ values[0].counter = submit_values[i].value;
+ sstrncpy(vl.type_instance, submit_values[i].name,
+ sizeof(vl.type_instance));
+ DEBUG("%s-%s/fscache-%s = %llu",
+ vl.plugin, vl.plugin_instance,
+ vl.type_instance, submit_values[i].value);
+ plugin_dispatch_values(&vl);
+ }
+}
+
+static void fscache_read_stats_file(FILE *fh){
+ int forcount = 0;
+ int count = 0;
+ int start = 0;
+ int numfields = 0;
+ int valuecounter = 0;
+ char filebuffer[BUFSIZE];
+ char valuebuffer[BUFSIZE];
+ char valuename[BUFSIZE];
+ char valuevalue[BUFSIZE];
+ char sectionbuffer[BUFSIZE];
+ char tempstring[BUFSIZE];
+ char *ptrfilebuffer = filebuffer;
+ char *position = NULL;
+ char *fields[fscache_number_of_values];
+ struct fscache_values values[fscache_number_of_values];
+
+ /* Read file line by line */
+ while( fgets( filebuffer, BUFSIZE, fh)!= NULL){
+ /*skip first line and split file on : */
+ if (count != 0){
+ position = strchr(filebuffer,':');
+ start = strlen(filebuffer) - 1;
+ filebuffer[start] = '\0';
+ /* : is located at value 8, +1 to remove space */
+ strncpy(valuebuffer, ptrfilebuffer+9, start);
+ /*store section info for later */
+ strncpy(sectionbuffer, ptrfilebuffer, position - filebuffer);
+ position = strchr(sectionbuffer, ' ');
+ if (position != NULL){
+ sectionbuffer[position-sectionbuffer] = '\0';
+ }
+
+ /*split rest of line by space and then split that via =*/
+ numfields = strsplit ( valuebuffer, fields,
+ fscache_number_of_values);
+ for( forcount = 0; forcount < numfields; forcount++ ){
+ char *field = fields[forcount];
+ memset(valuename,'\0',sizeof(valuename));
+ position = strchr(field, '=');
+ /* Test to see if we actually have a metric to split on
+ * and assign the values to the struct array */
+ if (position != NULL){
+ strncpy(valuename, field, position - field);
+ strncpy(valuevalue, field + (position - field + 1),
+ strlen(field));
+ memset(tempstring,'\0',sizeof(tempstring));
+ strncat(tempstring,sectionbuffer,sizeof(tempstring));
+ strncat(tempstring,"_",1);
+ strncat(tempstring,valuename, sizeof(tempstring));
+ memset(values[valuecounter].name,'\0',
+ sizeof(values[valuecounter].name));
+ strncpy(values[valuecounter].name,tempstring,
+ sizeof(values[valuecounter].name));
+ values[valuecounter].value = atoll(valuevalue);
+ }
+ valuecounter++;
+ }
+ }
+ count++;
+ }
+ fscache_submit(values);
+}
+
+static int fscache_read (void){
+ FILE *fh;
+ fh = fopen("/proc/fs/fscache/stats", "r");
+ if (fh != NULL){
+ fscache_read_stats_file(fh);
+ fclose(fh);
+
+ }else{
+ printf("cant open file\n");
+ return (-1);
+ }
+ return (0);
+}
+
+void module_register (void)
+{
+ plugin_register_read ("fscache", fscache_read);
+} /* void module_register */
+
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