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root/i-scream/projects/libstatgrab/src/libstatgrab/disk_stats.c

Comparing projects/libstatgrab/src/libstatgrab/disk_stats.c (file contents):
Revision 1.2 by pajs, Thu Feb 20 13:08:45 2003 UTC vs.
Revision 1.50 by ats, Wed Jan 21 23:46:54 2004 UTC

#	Line 1 | Line 1
1	<	/*
1	>	/*
2		* i-scream central monitoring system
3	<	* http://www.i-scream.org.uk
4	<	* Copyright (C) 2000-2002 i-scream
3	>	* http://www.i-scream.org
4	>	* Copyright (C) 2000-2004 i-scream
5		*
6	<	* This program is free software; you can redistribute it and/or
7	<	* modify it under the terms of the GNU General Public License
8	<	* as published by the Free Software Foundation; either version 2
9	<	* of the License, or (at your option) any later version.
6	>	* This library is free software; you can redistribute it and/or
7	>	* modify it under the terms of the GNU Lesser General Public
8	>	* License as published by the Free Software Foundation; either
9	>	* version 2.1 of the License, or (at your option) any later version.
10		*
11	<	* This program is distributed in the hope that it will be useful,
11	>	* This library is distributed in the hope that it will be useful,
12		* but WITHOUT ANY WARRANTY; without even the implied warranty of
13	<	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14	<	* GNU General Public License for more details.
13	>	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14	>	* Lesser General Public License for more details.
15		*
16	<	* You should have received a copy of the GNU General Public License
17	<	* along with this program; if not, write to the Free Software
18	<	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
16	>	* You should have received a copy of the GNU Lesser General Public
17	>	* License along with this library; if not, write to the Free Software
18	>	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19	>	* 02111-1307 USA
20	>	*
21	>	* $Id$
22		*/
23
24		#ifdef HAVE_CONFIG_H
25		#include "config.h"
26		#endif
27
25	–	#include "statgrab.h"
26	–	#include <stdlib.h>
28		#include <stdio.h>
29	<	#include "ukcprog.h"
29	>	#include <stdlib.h>
30		#include <string.h>
31	+	#include <time.h>
32	+	#include "statgrab.h"
33
34		#ifdef SOLARIS
35		#include <sys/mnttab.h>
33	–	#include <sys/types.h>
36		#include <sys/statvfs.h>
37	<
37	>	#include <kstat.h>
38		#define VALID_FS_TYPES {"ufs", "tmpfs"}
39	+	#endif
40
41	+	#if defined(LINUX) || defined(CYGWIN)
42	+	#include <mntent.h>
43	+	#include <sys/vfs.h>
44	+	#include "tools.h"
45		#endif
46
47	+	#ifdef LINUX
48	+	#define VALID_FS_TYPES {"adfs", "affs", "befs", "bfs", "efs", "ext2", \
49	+	"ext3", "vxfs", "hfs", "hfsplus", "hpfs", "jffs", \
50	+	"jffs2", "minix", "msdos", "ntfs", "qnx4", "ramfs", \
51	+	"rootfs", "reiserfs", "sysv", "v7", "udf", "ufs", \
52	+	"umsdos", "vfat", "xfs", "jfs"}
53	+	#endif
54	+
55	+	#ifdef CYGWIN
56	+	#define VALID_FS_TYPES {"user"}
57	+	#endif
58	+
59	+	#ifdef ALLBSD
60	+	#include <sys/param.h>
61	+	#include <sys/ucred.h>
62	+	#include <sys/mount.h>
63	+	#endif
64	+	#ifdef FREEBSD
65	+	#include <sys/dkstat.h>
66	+	#include <devstat.h>
67	+	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
68	+	"ufs", "mfs"}
69	+	#endif
70	+	#ifdef NETBSD
71	+	#include <sys/param.h>
72	+	#include <sys/sysctl.h>
73	+	#include <sys/disk.h>
74	+	#define VALID_FS_TYPES {"ffs", "mfs", "msdos", "lfs", "adosfs", "ext2fs", \
75	+	"ntfs"}
76	+	#endif
77	+
78		#define START_VAL 1
79
80		char *copy_string(char *orig_ptr, const char *newtext){
#	Line 61 | Line 99 | void init_disk_stat(int start, int end, disk_stat_t *d
99
100		disk_stats++;
101		}
102	+	}
103
104	+	int is_valid_fs_type(const char *type) {
105	+	const char *types[] = VALID_FS_TYPES;
106	+	int i;
107	+
108	+	for (i = 0; i < (sizeof types / sizeof *types); i++) {
109	+	if (strcmp(types[i], type) == 0) {
110	+	return 1;
111	+	}
112	+	}
113	+	return 0;
114		}
115
116		disk_stat_t *get_disk_stats(int *entries){
#	Line 69 | Line 118 | disk_stat_t *get_disk_stats(int *entries){
118		static disk_stat_t *disk_stats;
119		static int watermark=-1;
120
121	<	char *fs_types[] = VALID_FS_TYPES;
73	<	int x, valid_type;
74	<
121	>	int valid_type;
122		int num_disks=0;
123	<	struct mnttab mp;
77	<	struct statvfs fs;
123	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
124		FILE *f;
125	+	#endif
126
127		disk_stat_t *disk_ptr;
128
129	+	#ifdef SOLARIS
130	+	struct mnttab mp;
131	+	struct statvfs fs;
132	+	#endif
133	+	#if defined(LINUX) || defined(CYGWIN)
134	+	struct mntent *mp;
135	+	struct statfs fs;
136	+	#endif
137	+	#ifdef ALLBSD
138	+	int nummnt;
139	+	struct statfs *mp;
140	+	#endif
141	+
142		if(watermark==-1){
143		disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
144		if(disk_stats==NULL){
#	Line 87 | Line 147 | disk_stat_t *get_disk_stats(int *entries){
147		watermark=START_VAL;
148		init_disk_stat(0, watermark-1, disk_stats);
149		}
150	+	#ifdef ALLBSD
151	+	nummnt=getmntinfo(&mp , MNT_LOCAL);
152	+	if (nummnt<=0){
153	+	return NULL;
154	+	}
155	+	for(;nummnt--; mp++){
156	+	valid_type = is_valid_fs_type(mp->f_fstypename);
157	+	#endif
158
159	+	#if defined(LINUX) || defined(CYGWIN)
160	+	if ((f=setmntent("/etc/mtab", "r" ))==NULL){
161	+	return NULL;
162	+	}
163
164	+	while((mp=getmntent(f))){
165	+	if((statfs(mp->mnt_dir, &fs)) !=0){
166	+	continue;
167	+	}
168	+
169	+	valid_type = is_valid_fs_type(mp->mnt_type);
170	+	#endif
171	+
172	+	#ifdef SOLARIS
173		if ((f=fopen("/etc/mnttab", "r" ))==NULL){
174		return NULL;
175		}
#	Line 96 | Line 177 | disk_stat_t *get_disk_stats(int *entries){
177		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
178		continue;
179		}
180	+	valid_type = is_valid_fs_type(mp.mnt_fstype);
181	+	#endif
182
100	–	valid_type=0;
101	–	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
102	–	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
103	–	valid_type=1;
104	–	break;
105	–	}
106	–	}
107	–
183		if(valid_type){
184		if(num_disks>watermark-1){
185		disk_ptr=disk_stats;
#	Line 118 | Line 193 | disk_stat_t *get_disk_stats(int *entries){
193		}
194
195		disk_ptr=disk_stats+num_disks;
196	<
196	>	#ifdef ALLBSD
197	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
198	>	return NULL;
199	>	}
200	>
201	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->f_fstypename))==NULL){
202	>	return NULL;
203	>	}
204	>
205	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->f_mntonname))==NULL){
206	>	return NULL;
207	>	}
208	>
209	>	disk_ptr->size = (long long)mp->f_bsize * (long long) mp->f_blocks;
210	>	disk_ptr->avail = (long long)mp->f_bsize * (long long) mp->f_bavail;
211	>	disk_ptr->used = (disk_ptr->size) - ((long long)mp->f_bsize * (long long)mp->f_bfree);
212	>
213	>	disk_ptr->total_inodes=(long long)mp->f_files;
214	>	disk_ptr->free_inodes=(long long)mp->f_ffree;
215	>	/* Freebsd doesn't have a "available" inodes */
216	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
217	>	#endif
218	>	#if defined(LINUX) || defined(CYGWIN)
219	>	if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->mnt_fsname))==NULL){
220	>	return NULL;
221	>	}
222	>
223	>	if((disk_ptr->fs_type=copy_string(disk_ptr->fs_type, mp->mnt_type))==NULL){
224	>	return NULL;
225	>	}
226	>
227	>	if((disk_ptr->mnt_point=copy_string(disk_ptr->mnt_point, mp->mnt_dir))==NULL){
228	>	return NULL;
229	>	}
230	>	disk_ptr->size = (long long)fs.f_bsize * (long long)fs.f_blocks;
231	>	disk_ptr->avail = (long long)fs.f_bsize * (long long)fs.f_bavail;
232	>	disk_ptr->used = (disk_ptr->size) - ((long long)fs.f_bsize * (long long)fs.f_bfree);
233	>
234	>	disk_ptr->total_inodes=(long long)fs.f_files;
235	>	disk_ptr->free_inodes=(long long)fs.f_ffree;
236	>	/* Linux doesn't have a "available" inodes */
237	>	disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
238	>	#endif
239	>
240	>	#ifdef SOLARIS
241		/* Memory leak in event of realloc failing */
242		/* Maybe make this char[bigenough] and do strncpy's and put a null in the end?
243	<	Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE woul prob be upwards
244	<	of a k each */
243	>	* Downside is its a bit hungry for a lot of mounts, as MNT_MAX_SIZE would prob
244	>	* be upwards of a k each
245	>	*/
246		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp.mnt_special))==NULL){
247		return NULL;
248		}
#	Line 142 | Line 262 | disk_stat_t *get_disk_stats(int *entries){
262		disk_ptr->total_inodes=(long long)fs.f_files;
263		disk_ptr->used_inodes=disk_ptr->total_inodes - (long long)fs.f_ffree;
264		disk_ptr->free_inodes=(long long)fs.f_favail;
265	<
265	>	#endif
266		num_disks++;
267		}
268		}
269
270		*entries=num_disks;
271
272	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
272	>	/* If this fails, there is very little i can do about it, so
273	>	I'll ignore it :) */
274	>	#if defined(LINUX) || defined(CYGWIN)
275	>	endmntent(f);
276	>	#endif
277	>	#if defined(SOLARIS)
278		fclose(f);
279	+	#endif
280
281		return disk_stats;
282
283		}
284	+	void diskio_stat_init(int start, int end, diskio_stat_t *diskio_stats){
285
286	<	diskio_stat_t get_diskio_stats(int *entries){
286	>	for(diskio_stats+=start; start<end; start++){
287	>	diskio_stats->disk_name=NULL;
288	>
289	>	diskio_stats++;
290	>	}
291	>	}
292
293	<	/* Do jibble */
293	>	diskio_stat_t *diskio_stat_malloc(int needed_entries, int *cur_entries, diskio_stat_t *diskio_stats){
294	>
295	>	if(diskio_stats==NULL){
296	>
297	>	if((diskio_stats=malloc(needed_entries * sizeof(diskio_stat_t)))==NULL){
298	>	return NULL;
299	>	}
300	>	diskio_stat_init(0, needed_entries, diskio_stats);
301	>	*cur_entries=needed_entries;
302	>
303	>	return diskio_stats;
304	>	}
305	>
306	>
307	>	if(*cur_entries<needed_entries){
308	>	diskio_stats=realloc(diskio_stats, (sizeof(diskio_stat_t)*needed_entries));
309	>	if(diskio_stats==NULL){
310	>	return NULL;
311	>	}
312	>	diskio_stat_init(*cur_entries, needed_entries, diskio_stats);
313	>	*cur_entries=needed_entries;
314	>	}
315	>
316	>	return diskio_stats;
317	>	}
318	>
319	>	static diskio_stat_t *diskio_stats=NULL;
320	>	static int num_diskio=0;
321	>
322	>	#ifdef LINUX
323	>	typedef struct {
324	>	int major;
325	>	int minor;
326	>	} partition;
327	>	#endif
328	>
329	>	diskio_stat_t *get_diskio_stats(int *entries){
330	>
331	>	static int sizeof_diskio_stats=0;
332	>	#ifndef LINUX
333	>	diskio_stat_t *diskio_stats_ptr;
334	>	#endif
335	>
336	>	#ifdef SOLARIS
337	>	kstat_ctl_t *kc;
338	>	kstat_t *ksp;
339	>	kstat_io_t kios;
340	>	#endif
341	>	#ifdef LINUX
342	>	FILE *f;
343	>	char *line_ptr;
344	>	int major, minor;
345	>	int has_pp_stats = 1;
346	>	static partition *parts = NULL;
347	>	static int alloc_parts = 0;
348	>	int i, n;
349	>	time_t now;
350	>	const char *format;
351	>	#endif
352	>	#ifdef FREEBSD
353	>	static struct statinfo stats;
354	>	static int stats_init = 0;
355	>	int counter;
356	>	struct device_selection *dev_sel = NULL;
357	>	int n_selected, n_selections;
358	>	long sel_gen;
359	>	struct devstat *dev_ptr;
360	>	#endif
361	>	#ifdef NETBSD
362	>	struct disk_sysctl *stats;
363	>	int num_disks, i;
364	>	int mib[3];
365	>	size_t size;
366	>	#endif
367	>
368	>	num_diskio=0;
369	>
370	>	#ifdef NETBSD
371	>	mib[0] = CTL_HW;
372	>	mib[1] = HW_DISKSTATS;
373	>	mib[2] = sizeof(struct disk_sysctl);
374	>
375	>	if (sysctl(mib, 3, NULL, &size, NULL, 0) < 0) {
376	>	return NULL;
377	>	}
378	>	num_disks = size / sizeof(struct disk_sysctl);
379	>
380	>	stats = malloc(size);
381	>	if (stats == NULL) {
382	>	return NULL;
383	>	}
384	>
385	>	if (sysctl(mib, 3, stats, &size, NULL, 0) < 0) {
386	>	return NULL;
387	>	}
388	>
389	>	for (i = 0; i < num_disks; i++) {
390	>	u_int64_t rbytes, wbytes;
391	>
392	>	#ifdef HAVE_DK_RBYTES
393	>	rbytes = stats[i].dk_rbytes;
394	>	wbytes = stats[i].dk_wbytes;
395	>	#else
396	>	/* Before 1.7, NetBSD merged reads and writes. */
397	>	rbytes = wbytes = stats[i].dk_bytes;
398	>	#endif
399	>
400	>	/* Don't keep stats for disks that have never been used. */
401	>	if (rbytes == 0 && wbytes == 0) {
402	>	continue;
403	>	}
404	>
405	>	diskio_stats = diskio_stat_malloc(num_diskio + 1,
406	>	&sizeof_diskio_stats,
407	>	diskio_stats);
408	>	if (diskio_stats == NULL) {
409	>	return NULL;
410	>	}
411	>	diskio_stats_ptr = diskio_stats + num_diskio;
412	>
413	>	diskio_stats_ptr->read_bytes = rbytes;
414	>	diskio_stats_ptr->write_bytes = wbytes;
415	>	if (diskio_stats_ptr->disk_name != NULL) {
416	>	free(diskio_stats_ptr->disk_name);
417	>	}
418	>	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
419	>	diskio_stats_ptr->systime = time(NULL);
420	>
421	>	num_diskio++;
422	>	}
423	>
424	>	free(stats);
425	>	#endif
426	>
427	>	#ifdef FREEBSD
428	>	if (!stats_init) {
429	>	stats.dinfo=malloc(sizeof(struct devinfo));
430	>	if(stats.dinfo==NULL) return NULL;
431	>	bzero(stats.dinfo, sizeof(struct devinfo));
432	>	stats_init = 1;
433	>	}
434	>	#ifdef FREEBSD5
435	>	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
436	>	/* Not aware of a get all devices, so i said 999. If we ever
437	>	* find a machine with more than 999 disks, then i'll change
438	>	* this number :)
439	>	*/
440	>	if (devstat_selectdevs(&dev_sel, &n_selected, &n_selections, &sel_gen, stats.dinfo->generation, stats.dinfo->devices, stats.dinfo->numdevs, NULL, 0, NULL, 0, DS_SELECT_ONLY, 999, 1) < 0) return NULL;
441	>	#else
442	>	if ((getdevs(&stats)) < 0) return NULL;
443	>	/* Not aware of a get all devices, so i said 999. If we ever
444	>	* find a machine with more than 999 disks, then i'll change
445	>	* this number :)
446	>	*/
447	>	if (selectdevs(&dev_sel, &n_selected, &n_selections, &sel_gen, stats.dinfo->generation, stats.dinfo->devices, stats.dinfo->numdevs, NULL, 0, NULL, 0, DS_SELECT_ONLY, 999, 1) < 0) return NULL;
448	>	#endif
449	>
450	>	for(counter=0;counter<stats.dinfo->numdevs;counter++){
451	>	dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
452	>
453	>	/* Throw away devices that have done nothing, ever.. Eg "odd"
454	>	* devices.. like mem, proc.. and also doesn't report floppy
455	>	* drives etc unless they are doing stuff :)
456	>	*/
457	>	#ifdef FREEBSD5
458	>	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
459	>	#else
460	>	if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
461	>	#endif
462	>	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
463	>	return NULL;
464	>	}
465	>	diskio_stats_ptr=diskio_stats+num_diskio;
466	>
467	>	#ifdef FREEBSD5
468	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
469	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
470	>	#else
471	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
472	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
473	>	#endif
474	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
475	>	asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
476	>	diskio_stats_ptr->systime=time(NULL);
477	>
478	>	num_diskio++;
479	>	}
480	>	free(dev_sel);
481	>
482	>	#endif
483	>	#ifdef SOLARIS
484	>	if ((kc = kstat_open()) == NULL) {
485	>	return NULL;
486	>	}
487	>
488	>	for (ksp = kc->kc_chain; ksp; ksp = ksp->ks_next) {
489	>	if (!strcmp(ksp->ks_class, "disk")) {
490	>
491	>	if(ksp->ks_type != KSTAT_TYPE_IO) continue;
492	>	/* We dont want metadevices appearins as num_diskio */
493	>	if(strcmp(ksp->ks_module, "md")==0) continue;
494	>	if((kstat_read(kc, ksp, &kios))==-1){
495	>	}
496	>
497	>	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
498	>	kstat_close(kc);
499	>	return NULL;
500	>	}
501	>	diskio_stats_ptr=diskio_stats+num_diskio;
502	>
503	>	diskio_stats_ptr->read_bytes=kios.nread;
504	>
505	>	diskio_stats_ptr->write_bytes=kios.nwritten;
506	>
507	>	if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
508	>
509	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
510	>	diskio_stats_ptr->systime=time(NULL);
511	>	num_diskio++;
512	>	}
513	>	}
514	>
515	>	kstat_close(kc);
516	>	#endif
517	>
518	>	#ifdef LINUX
519	>	num_diskio = 0;
520	>	n = 0;
521	>
522	>	/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
523	>	have statistics in here too, so we can use those directly.
524	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
525	>	the same format. */
526	>
527	>	f = fopen("/proc/diskstats", "r");
528	>	format = " %d %d %19s %*d %*d %lld %*d %*d %*d %lld";
529	>	if (f == NULL) {
530	>	f = fopen("/proc/partitions", "r");
531	>	format = " %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld";
532	>	}
533	>	if (f == NULL) goto out;
534	>	now = time(NULL);
535	>
536	>	while ((line_ptr = f_read_line(f, "")) != NULL) {
537	>	char name[20];
538	>	char *s;
539	>	long long rsect, wsect;
540	>
541	>	int nr = sscanf(line_ptr, format,
542	>	&major, &minor, name, &rsect, &wsect);
543	>	if (nr < 3) continue;
544	>
545	>	/* Skip device names ending in numbers, since they're
546	>	partitions. */
547	>	s = name;
548	>	while (*s != '\0') s++;
549	>	--s;
550	>	if (*s >= '0' && *s <= '9') continue;
551	>
552	>	if (nr < 5) {
553	>	has_pp_stats = 0;
554	>	rsect = 0;
555	>	wsect = 0;
556	>	}
557	>
558	>	diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
559	>	diskio_stats);
560	>	if (diskio_stats == NULL) goto out;
561	>	if (n >= alloc_parts) {
562	>	alloc_parts += 16;
563	>	parts = realloc(parts, alloc_parts * sizeof *parts);
564	>	if (parts == NULL) {
565	>	alloc_parts = 0;
566	>	goto out;
567	>	}
568	>	}
569	>
570	>	if (diskio_stats[n].disk_name != NULL)
571	>	free(diskio_stats[n].disk_name);
572	>	diskio_stats[n].disk_name = strdup(name);
573	>	diskio_stats[n].read_bytes = rsect * 512;
574	>	diskio_stats[n].write_bytes = wsect * 512;
575	>	diskio_stats[n].systime = now;
576	>	parts[n].major = major;
577	>	parts[n].minor = minor;
578	>
579	>	n++;
580	>	}
581	>
582	>	fclose(f);
583	>	f = NULL;
584	>
585	>	if (!has_pp_stats) {
586	>	/* This is an older kernel where /proc/partitions doesn't
587	>	contain stats. Read what we can from /proc/stat instead, and
588	>	fill in the appropriate bits of the list allocated above. */
589	>
590	>	f = fopen("/proc/stat", "r");
591	>	if (f == NULL) goto out;
592	>	now = time(NULL);
593	>
594	>	line_ptr = f_read_line(f, "disk_io:");
595	>	if (line_ptr == NULL) goto out;
596	>
597	>	while((line_ptr=strchr(line_ptr, ' '))!=NULL){
598	>	long long rsect, wsect;
599	>
600	>	if (*++line_ptr == '\0') break;
601	>
602	>	if((sscanf(line_ptr,
603	>	"(%d,%d):(%*d, %*d, %lld, %*d, %lld)",
604	>	&major, &minor, &rsect, &wsect)) != 4) {
605	>	continue;
606	>	}
607	>
608	>	/* Find the corresponding device from earlier.
609	>	Just to add to the fun, "minor" is actually the disk
610	>	number, not the device minor, so we need to figure
611	>	out the real minor number based on the major!
612	>	This list is not exhaustive; if you're running
613	>	an older kernel you probably don't have fancy
614	>	I2O hardware anyway... */
615	>	switch (major) {
616	>	case 3:
617	>	case 21:
618	>	case 22:
619	>	case 33:
620	>	case 34:
621	>	case 36:
622	>	case 56:
623	>	case 57:
624	>	case 88:
625	>	case 89:
626	>	case 90:
627	>	case 91:
628	>	minor *= 64;
629	>	break;
630	>	case 9:
631	>	case 43:
632	>	break;
633	>	default:
634	>	minor *= 16;
635	>	break;
636	>	}
637	>	for (i = 0; i < n; i++) {
638	>	if (major == parts[i].major
639	>	&& minor == parts[i].minor)
640	>	break;
641	>	}
642	>	if (i == n) continue;
643	>
644	>	/* We read the number of blocks. Blocks are stored in
645	>	512 bytes */
646	>	diskio_stats[i].read_bytes = rsect * 512;
647	>	diskio_stats[i].write_bytes = wsect * 512;
648	>	diskio_stats[i].systime = now;
649	>	}
650	>	}
651	>
652	>	num_diskio = n;
653	>	out:
654	>	if (f != NULL) fclose(f);
655	>	#endif
656	>
657	>	#ifdef CYGWIN
658		return NULL;
659	+	#endif
660	+
661	+	*entries=num_diskio;
662	+
663	+	return diskio_stats;
664		}
665	+
666	+	diskio_stat_t *get_diskio_stats_diff(int *entries){
667	+	static diskio_stat_t *diff = NULL;
668	+	static int diff_count = 0;
669	+	diskio_stat_t *src, *dest;
670	+	int i, j, new_count;
671	+
672	+	if (diskio_stats == NULL) {
673	+	/* No previous stats, so we can't calculate a difference. */
674	+	return get_diskio_stats(entries);
675	+	}
676	+
677	+	/* Resize the results array to match the previous stats. */
678	+	diff = diskio_stat_malloc(num_diskio, &diff_count, diff);
679	+	if (diff == NULL) {
680	+	return NULL;
681	+	}
682	+
683	+	/* Copy the previous stats into the result. */
684	+	for (i = 0; i < diff_count; i++) {
685	+	src = &diskio_stats[i];
686	+	dest = &diff[i];
687	+
688	+	if (dest->disk_name != NULL) {
689	+	free(dest->disk_name);
690	+	}
691	+	dest->disk_name = strdup(src->disk_name);
692	+	dest->read_bytes = src->read_bytes;
693	+	dest->write_bytes = src->write_bytes;
694	+	dest->systime = src->systime;
695	+	}
696	+
697	+	/* Get a new set of stats. */
698	+	if (get_diskio_stats(&new_count) == NULL) {
699	+	return NULL;
700	+	}
701	+
702	+	/* For each previous stat... */
703	+	for (i = 0; i < diff_count; i++) {
704	+	dest = &diff[i];
705	+
706	+	/* ... find the corresponding new stat ... */
707	+	for (j = 0; j < new_count; j++) {
708	+	/* Try the new stat in the same position first,
709	+	since that's most likely to be it. */
710	+	src = &diskio_stats[(i + j) % new_count];
711	+	if (strcmp(src->disk_name, dest->disk_name) == 0) {
712	+	break;
713	+	}
714	+	}
715	+	if (j == new_count) {
716	+	/* No match found. */
717	+	continue;
718	+	}
719	+
720	+	/* ... and subtract the previous stat from it to get the
721	+	difference. */
722	+	dest->read_bytes = src->read_bytes - dest->read_bytes;
723	+	dest->write_bytes = src->write_bytes - dest->write_bytes;
724	+	dest->systime = src->systime - dest->systime;
725	+	}
726	+
727	+	*entries = diff_count;
728	+	return diff;
729	+	}
730	+

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