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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 1.40 by ats, Mon Nov 10 23:25:45 2003 UTC vs.
Revision 1.56 by ats, Sun Apr 4 22:18:38 2004 UTC

#	Line 1 | Line 1
1	<	/*
1	>	/*
2		* i-scream central monitoring system
3		* http://www.i-scream.org
4	<	* Copyright (C) 2000-2003 i-scream
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
#	Line 27 | Line 30
30		#include <string.h>
31		#include <time.h>
32		#include "statgrab.h"
33	+	#include "vector.h"
34
35		#ifdef SOLARIS
36		#include <sys/mnttab.h>
#	Line 58 | Line 62
62		#include <sys/ucred.h>
63		#include <sys/mount.h>
64		#endif
65	<	#ifdef FREEBSD
65	>	#if defined(FREEBSD) || defined(DFBSD)
66		#include <sys/dkstat.h>
67		#include <devstat.h>
68		#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
69		"ufs", "mfs"}
70		#endif
71	<	#ifdef NETBSD
71	>	#if defined(NETBSD) || defined(OPENBSD)
72		#include <sys/param.h>
73		#include <sys/sysctl.h>
74		#include <sys/disk.h>
#	Line 72 | Line 76
76		"ntfs"}
77		#endif
78
75	–	#define START_VAL 1
76	–
79		char *copy_string(char *orig_ptr, const char *newtext){
80
81		/* Maybe free if not NULL, and strdup rather than realloc and strcpy? */
#	Line 86 | Line 88 | char *copy_string(char *orig_ptr, const char *newtext)
88		return orig_ptr;
89		}
90
91	+	static void disk_stat_init(disk_stat_t *d) {
92	+	d->device_name = NULL;
93	+	d->fs_type = NULL;
94	+	d->mnt_point = NULL;
95	+	}
96
97	<	void init_disk_stat(int start, int end, disk_stat_t *disk_stats){
97	>	static void disk_stat_destroy(disk_stat_t *d) {
98	>	free(d->device_name);
99	>	free(d->fs_type);
100	>	free(d->mnt_point);
101	>	}
102
103	<	for(disk_stats+=start; start<=end; start++){
104	<	disk_stats->device_name=NULL;
105	<	disk_stats->fs_type=NULL;
106	<	disk_stats->mnt_point=NULL;
107	<
108	<	disk_stats++;
103	>	int is_valid_fs_type(const char *type) {
104	>	const char *types[] = VALID_FS_TYPES;
105	>	int i;
106	>
107	>	for (i = 0; i < (sizeof types / sizeof *types); i++) {
108	>	if (strcmp(types[i], type) == 0) {
109	>	return 1;
110	>	}
111		}
112	+	return 0;
113		}
114
115		disk_stat_t *get_disk_stats(int *entries){
116	+	VECTOR_DECLARE_STATIC(disk_stats, disk_stat_t, 10,
117	+	disk_stat_init, disk_stat_destroy);
118
119	<	static disk_stat_t *disk_stats;
104	<	static int watermark=-1;
105	<
106	<	char *fs_types[] = VALID_FS_TYPES;
107	<	int x, valid_type;
119	>	int valid_type;
120		int num_disks=0;
121		#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
122		FILE *f;
#	Line 125 | Line 137 | disk_stat_t *get_disk_stats(int *entries){
137		struct statfs *mp;
138		#endif
139
128	–	if(watermark==-1){
129	–	disk_stats=malloc(START_VAL * sizeof(disk_stat_t));
130	–	if(disk_stats==NULL){
131	–	return NULL;
132	–	}
133	–	watermark=START_VAL;
134	–	init_disk_stat(0, watermark-1, disk_stats);
135	–	}
140		#ifdef ALLBSD
141		nummnt=getmntinfo(&mp , MNT_LOCAL);
142		if (nummnt<=0){
143		return NULL;
144		}
145		for(;nummnt--; mp++){
146	<	valid_type=0;
143	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
144	<	if(strcmp(mp->f_fstypename, fs_types[x]) ==0){
145	<	valid_type=1;
146	<	break;
147	<	}
148	<	}
146	>	valid_type = is_valid_fs_type(mp->f_fstypename);
147		#endif
148
149		#if defined(LINUX) || defined(CYGWIN)
#	Line 158 | Line 156 | disk_stat_t *get_disk_stats(int *entries){
156		continue;
157		}
158
159	<	valid_type=0;
162	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
163	<	if(strcmp(mp->mnt_type, fs_types[x]) ==0){
164	<	valid_type=1;
165	<	break;
166	<	}
167	<	}
159	>	valid_type = is_valid_fs_type(mp->mnt_type);
160		#endif
161
162		#ifdef SOLARIS
#	Line 175 | Line 167 | disk_stat_t *get_disk_stats(int *entries){
167		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
168		continue;
169		}
170	<	valid_type=0;
179	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
180	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
181	<	valid_type=1;
182	<	break;
183	<	}
184	<	}
170	>	valid_type = is_valid_fs_type(mp.mnt_fstype);
171		#endif
172
173		if(valid_type){
174	<	if(num_disks>watermark-1){
175	<	disk_ptr=disk_stats;
190	<	if((disk_stats=realloc(disk_stats, (watermark*2 * sizeof(disk_stat_t))))==NULL){
191	<	disk_stats=disk_ptr;
192	<	return NULL;
193	<	}
194	<
195	<	watermark=watermark*2;
196	<	init_disk_stat(num_disks, watermark-1, disk_stats);
174	>	if (VECTOR_RESIZE(disk_stats, num_disks + 1) < 0) {
175	>	return NULL;
176		}
198	–
177		disk_ptr=disk_stats+num_disks;
178	+
179		#ifdef ALLBSD
180		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
181		return NULL;
#	Line 285 | Line 264 | disk_stat_t *get_disk_stats(int *entries){
264		return disk_stats;
265
266		}
288	–	void diskio_stat_init(int start, int end, diskio_stat_t *diskio_stats){
267
268	<	for(diskio_stats+=start; start<end; start++){
269	<	diskio_stats->disk_name=NULL;
292	<
293	<	diskio_stats++;
294	<	}
268	>	static void diskio_stat_init(diskio_stat_t *d) {
269	>	d->disk_name = NULL;
270		}
271
272	<	diskio_stat_t *diskio_stat_malloc(int needed_entries, int *cur_entries, diskio_stat_t *diskio_stats){
273	<
299	<	if(diskio_stats==NULL){
300	<
301	<	if((diskio_stats=malloc(needed_entries * sizeof(diskio_stat_t)))==NULL){
302	<	return NULL;
303	<	}
304	<	diskio_stat_init(0, needed_entries, diskio_stats);
305	<	*cur_entries=needed_entries;
306	<
307	<	return diskio_stats;
308	<	}
309	<
310	<
311	<	if(*cur_entries<needed_entries){
312	<	diskio_stats=realloc(diskio_stats, (sizeof(diskio_stat_t)*needed_entries));
313	<	if(diskio_stats==NULL){
314	<	return NULL;
315	<	}
316	<	diskio_stat_init(*cur_entries, needed_entries, diskio_stats);
317	<	*cur_entries=needed_entries;
318	<	}
319	<
320	<	return diskio_stats;
272	>	static void diskio_stat_destroy(diskio_stat_t *d) {
273	>	free(d->disk_name);
274		}
275
276	<	static diskio_stat_t *diskio_stats=NULL;
277	<	static int num_diskio=0;
276	>	VECTOR_DECLARE_STATIC(diskio_stats, diskio_stat_t, 10,
277	>	diskio_stat_init, diskio_stat_destroy);
278
279		#ifdef LINUX
280		typedef struct {
#	Line 331 | Line 284 | typedef struct {
284		#endif
285
286		diskio_stat_t *get_diskio_stats(int *entries){
287	<
335	<	static int sizeof_diskio_stats=0;
287	>	int num_diskio;
288		#ifndef LINUX
289		diskio_stat_t *diskio_stats_ptr;
290		#endif
#	Line 353 | Line 305 | diskio_stat_t *get_diskio_stats(int *entries){
305		time_t now;
306		const char *format;
307		#endif
308	<	#ifdef FREEBSD
308	>	#if defined(FREEBSD) || defined(DFBSD)
309		static struct statinfo stats;
310		static int stats_init = 0;
311		int counter;
#	Line 364 | Line 316 | diskio_stat_t *get_diskio_stats(int *entries){
316		#endif
317		#ifdef NETBSD
318		struct disk_sysctl *stats;
319	+	#endif
320	+	#ifdef OPENBSD
321	+	int diskcount;
322	+	char *disknames, *name, *bufpp;
323	+	char **dk_name;
324	+	struct diskstats *stats;
325	+	#endif
326	+	#ifdef NETBSD
327	+	#define MIBSIZE 3
328	+	#endif
329	+	#ifdef OPENBSD
330	+	#define MIBSIZE 2
331	+	#endif
332	+	#if defined(NETBSD) || defined(OPENBSD)
333		int num_disks, i;
334	<	int mib[3];
334	>	int mib[MIBSIZE];
335		size_t size;
336		#endif
337
338		num_diskio=0;
339
340	<	#ifdef NETBSD
340	>	#ifdef OPENBSD
341		mib[0] = CTL_HW;
342	+	mib[1] = HW_DISKCOUNT;
343	+
344	+	size = sizeof(diskcount);
345	+	if (sysctl(mib, MIBSIZE, &diskcount, &size, NULL, 0) < 0) {
346	+	return NULL;
347	+	}
348	+
349	+	mib[0] = CTL_HW;
350	+	mib[1] = HW_DISKNAMES;
351	+
352	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
353	+	return NULL;
354	+	}
355	+
356	+	disknames = malloc(size);
357	+	if (disknames == NULL) {
358	+	return NULL;
359	+	}
360	+
361	+	if (sysctl(mib, MIBSIZE, disknames, &size, NULL, 0) < 0) {
362	+	return NULL;
363	+	}
364	+
365	+	dk_name = calloc(diskcount, sizeof(char *));
366	+	bufpp = disknames;
367	+	for (i = 0; i < diskcount && (name = strsep(&bufpp, ",")) != NULL; i++) {
368	+	dk_name[i] = name;
369	+	}
370	+	#endif
371	+
372	+	#if defined(NETBSD) || defined(OPENBSD)
373	+	mib[0] = CTL_HW;
374		mib[1] = HW_DISKSTATS;
375	+	#ifdef NETBSD
376		mib[2] = sizeof(struct disk_sysctl);
377	+	#endif
378
379	<	if (sysctl(mib, 3, NULL, &size, NULL, 0) < 0) {
379	>	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
380		return NULL;
381		}
382	+
383	+	#ifdef NETBSD
384		num_disks = size / sizeof(struct disk_sysctl);
385	+	#else
386	+	num_disks = size / sizeof(struct diskstats);
387	+	#endif
388
389		stats = malloc(size);
390		if (stats == NULL) {
391		return NULL;
392		}
393
394	<	if (sysctl(mib, 3, stats, &size, NULL, 0) < 0) {
394	>	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
395		return NULL;
396		}
397
398		for (i = 0; i < num_disks; i++) {
399		u_int64_t rbytes, wbytes;
400
401	+	#ifdef NETBSD
402		#ifdef HAVE_DK_RBYTES
403		rbytes = stats[i].dk_rbytes;
404		wbytes = stats[i].dk_wbytes;
#	Line 400 | Line 406 | diskio_stat_t *get_diskio_stats(int *entries){
406		/* Before 1.7, NetBSD merged reads and writes. */
407		rbytes = wbytes = stats[i].dk_bytes;
408		#endif
409	+	#else
410	+	rbytes = wbytes = stats[i].ds_bytes;
411	+	#endif
412
413		/* Don't keep stats for disks that have never been used. */
414		if (rbytes == 0 && wbytes == 0) {
415		continue;
416		}
417
418	<	diskio_stats = diskio_stat_malloc(num_diskio + 1,
410	<	&sizeof_diskio_stats,
411	<	diskio_stats);
412	<	if (diskio_stats == NULL) {
418	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
419		return NULL;
420		}
421		diskio_stats_ptr = diskio_stats + num_diskio;
#	Line 419 | Line 425 | diskio_stat_t *get_diskio_stats(int *entries){
425		if (diskio_stats_ptr->disk_name != NULL) {
426		free(diskio_stats_ptr->disk_name);
427		}
428	+	#ifdef NETBSD
429		diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
430	+	#else
431	+	diskio_stats_ptr->disk_name = strdup(dk_name[i]);
432	+	#endif
433		diskio_stats_ptr->systime = time(NULL);
434
435		num_diskio++;
436		}
437
438		free(stats);
439	+	#ifdef OPENBSD
440	+	free(dk_name);
441	+	free(disknames);
442		#endif
443	+	#endif
444
445	<	#ifdef FREEBSD
445	>	#if defined(FREEBSD) || defined(DFBSD)
446		if (!stats_init) {
447		stats.dinfo=malloc(sizeof(struct devinfo));
448		if(stats.dinfo==NULL) return NULL;
#	Line 463 | Line 477 | diskio_stat_t *get_diskio_stats(int *entries){
477		#else
478		if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
479		#endif
480	<	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
480	>
481	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
482		return NULL;
483		}
484		diskio_stats_ptr=diskio_stats+num_diskio;
#	Line 498 | Line 513 | diskio_stat_t *get_diskio_stats(int *entries){
513		if((kstat_read(kc, ksp, &kios))==-1){
514		}
515
516	<	if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
516	>	if (VECTOR_RESIZE(diskio_stats, num_diskio + 1) < 0) {
517		kstat_close(kc);
518		return NULL;
519		}
#	Line 510 | Line 525 | diskio_stat_t *get_diskio_stats(int *entries){
525
526		if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
527
528	<	diskio_stats_ptr->disk_name=strdup(ksp->ks_name);
528	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
529		diskio_stats_ptr->systime=time(NULL);
530		num_diskio++;
531		}
#	Line 529 | Line 544 | diskio_stat_t *get_diskio_stats(int *entries){
544		the same format. */
545
546		f = fopen("/proc/diskstats", "r");
547	<	format = " %d %d %19s %*d %*d %lld %*d %*d %*d %lld";
547	>	format = " %d %d %99s %*d %*d %lld %*d %*d %*d %lld";
548		if (f == NULL) {
549		f = fopen("/proc/partitions", "r");
550	<	format = " %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld";
550	>	format = " %d %d %*d %99s %*d %*d %lld %*d %*d %*d %lld";
551		}
552		if (f == NULL) goto out;
553		now = time(NULL);
554
555		while ((line_ptr = f_read_line(f, "")) != NULL) {
556	<	char name[20];
556	>	char name[100];
557		char *s;
558		long long rsect, wsect;
559
#	Line 559 | Line 574 | diskio_stat_t *get_diskio_stats(int *entries){
574		wsect = 0;
575		}
576
577	<	diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
578	<	diskio_stats);
579	<	if (diskio_stats == NULL) goto out;
577	>	if (VECTOR_RESIZE(diskio_stats, n + 1) < 0) {
578	>	goto out;
579	>	}
580		if (n >= alloc_parts) {
581		alloc_parts += 16;
582		parts = realloc(parts, alloc_parts * sizeof *parts);
#	Line 583 | Line 598 | diskio_stat_t *get_diskio_stats(int *entries){
598		n++;
599		}
600
601	+	fclose(f);
602	+	f = NULL;
603	+
604		if (!has_pp_stats) {
605	<	/* This is an older kernel without stats in /proc/partitions.
606	<	Read what we can from /proc/stat instead. */
605	>	/* This is an older kernel where /proc/partitions doesn't
606	>	contain stats. Read what we can from /proc/stat instead, and
607	>	fill in the appropriate bits of the list allocated above. */
608
609		f = fopen("/proc/stat", "r");
610		if (f == NULL) goto out;
#	Line 652 | Line 671 | diskio_stat_t *get_diskio_stats(int *entries){
671		num_diskio = n;
672		out:
673		if (f != NULL) fclose(f);
674	+	#endif
675
676	+	#ifdef CYGWIN
677	+	return NULL;
678		#endif
679	+
680		*entries=num_diskio;
681
682		return diskio_stats;
683		}
684
685		diskio_stat_t *get_diskio_stats_diff(int *entries){
686	<	static diskio_stat_t *diskio_stats_diff=NULL;
687	<	static int sizeof_diskio_stats_diff=0;
688	<	diskio_stat_t *diskio_stats_diff_ptr, *diskio_stats_ptr;
689	<	int disks, x, y;
686	>	VECTOR_DECLARE_STATIC(diff, diskio_stat_t, 1,
687	>	diskio_stat_init, diskio_stat_destroy);
688	>	diskio_stat_t *src = NULL, *dest;
689	>	int i, j, diff_count, new_count;
690
691	<	if(diskio_stats==NULL){
692	<	diskio_stats_ptr=get_diskio_stats(&disks);
693	<	*entries=disks;
671	<	return diskio_stats_ptr;
691	>	if (diskio_stats == NULL) {
692	>	/* No previous stats, so we can't calculate a difference. */
693	>	return get_diskio_stats(entries);
694		}
695
696	<	diskio_stats_diff=diskio_stat_malloc(num_diskio, &sizeof_diskio_stats_diff, diskio_stats_diff);
697	<	if(diskio_stats_diff==NULL){
696	>	/* Resize the results array to match the previous stats. */
697	>	diff_count = VECTOR_SIZE(diskio_stats);
698	>	if (VECTOR_RESIZE(diff, diff_count) < 0) {
699		return NULL;
700		}
701
702	<	diskio_stats_diff_ptr=diskio_stats_diff;
703	<	diskio_stats_ptr=diskio_stats;
702	>	/* Copy the previous stats into the result. */
703	>	for (i = 0; i < diff_count; i++) {
704	>	src = &diskio_stats[i];
705	>	dest = &diff[i];
706
707	<	for(disks=0;disks<num_diskio;disks++){
708	<	if(diskio_stats_diff_ptr->disk_name!=NULL){
684	<	free(diskio_stats_diff_ptr->disk_name);
707	>	if (dest->disk_name != NULL) {
708	>	free(dest->disk_name);
709		}
710	<	diskio_stats_diff_ptr->disk_name=strdup(diskio_stats_ptr->disk_name);
711	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes;
712	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes;
713	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime;
710	>	dest->disk_name = strdup(src->disk_name);
711	>	dest->read_bytes = src->read_bytes;
712	>	dest->write_bytes = src->write_bytes;
713	>	dest->systime = src->systime;
714	>	}
715
716	<	diskio_stats_diff_ptr++;
717	<	diskio_stats_ptr++;
716	>	/* Get a new set of stats. */
717	>	if (get_diskio_stats(&new_count) == NULL) {
718	>	return NULL;
719		}
720
721	<	diskio_stats_ptr=get_diskio_stats(&disks);
722	<	diskio_stats_diff_ptr=diskio_stats_diff;
721	>	/* For each previous stat... */
722	>	for (i = 0; i < diff_count; i++) {
723	>	dest = &diff[i];
724
725	<	for(x=0;x<sizeof_diskio_stats_diff;x++){
726	<
727	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
728	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
729	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
730	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
731	<	}else{
705	<	diskio_stats_ptr=diskio_stats;
706	<	for(y=0;y<disks;y++){
707	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
708	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
709	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
710	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
711	<
712	<	break;
713	<	}
714	<
715	<	diskio_stats_ptr++;
725	>	/* ... find the corresponding new stat ... */
726	>	for (j = 0; j < new_count; j++) {
727	>	/* Try the new stat in the same position first,
728	>	since that's most likely to be it. */
729	>	src = &diskio_stats[(i + j) % new_count];
730	>	if (strcmp(src->disk_name, dest->disk_name) == 0) {
731	>	break;
732		}
733		}
734	+	if (j == new_count) {
735	+	/* No match found. */
736	+	continue;
737	+	}
738
739	<	diskio_stats_ptr++;
740	<	diskio_stats_diff_ptr++;
741	<
739	>	/* ... and subtract the previous stat from it to get the
740	>	difference. */
741	>	dest->read_bytes = src->read_bytes - dest->read_bytes;
742	>	dest->write_bytes = src->write_bytes - dest->write_bytes;
743	>	dest->systime = src->systime - dest->systime;
744		}
745	<
746	<	*entries=sizeof_diskio_stats_diff;
747	<	return diskio_stats_diff;
745	>
746	>	*entries = diff_count;
747	>	return diff;
748		}
749	+

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