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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 1.21 by ats, Tue Sep 9 08:43:33 2003 UTC vs.
Revision 1.51 by tdb, Thu Feb 12 23:04:52 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 25 | Line 28
28		#include <stdio.h>
29		#include <stdlib.h>
30		#include <string.h>
31	+	#include <time.h>
32		#include "statgrab.h"
33
34		#ifdef SOLARIS
#	Line 34 | Line 38
38		#define VALID_FS_TYPES {"ufs", "tmpfs"}
39		#endif
40
41	<	#ifdef LINUX
38	<	#include <sys/vfs.h>
41	>	#if defined(LINUX) || defined(CYGWIN)
42		#include <mntent.h>
43	+	#include <sys/vfs.h>
44		#include "tools.h"
41	–	#define VALID_FS_TYPES {"ext2", "ext3", "xfs", "reiserfs", "vfat", "tmpfs"}
45		#endif
46
47	<	#ifdef FREEBSD
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 {"ufs", "mfs"}
67	>	#define VALID_FS_TYPES {"hpfs", "msdosfs", "ntfs", "udf", "ext2fs", \
68	>	"ufs", "mfs"}
69		#endif
70	+	#if defined(NETBSD) || defined(OPENBSD)
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 75 | Line 101 | void init_disk_stat(int start, int end, disk_stat_t *d
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){
117
118		static disk_stat_t *disk_stats;
119		static int watermark=-1;
120
121	<	char *fs_types[] = VALID_FS_TYPES;
84	<	int x, valid_type;
121	>	int valid_type;
122		int num_disks=0;
123	<	#if defined(LINUX) || defined (SOLARIS)
123	>	#if defined(LINUX) || defined (SOLARIS) || defined(CYGWIN)
124		FILE *f;
125		#endif
126
#	Line 93 | Line 130 | disk_stat_t *get_disk_stats(int *entries){
130		struct mnttab mp;
131		struct statvfs fs;
132		#endif
133	<	#ifdef LINUX
133	>	#if defined(LINUX) || defined(CYGWIN)
134		struct mntent *mp;
135		struct statfs fs;
136		#endif
137	<	#ifdef FREEBSD
137	>	#ifdef ALLBSD
138		int nummnt;
139		struct statfs *mp;
140		#endif
#	Line 110 | 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 FREEBSD
150	>	#ifdef ALLBSD
151		nummnt=getmntinfo(&mp , MNT_LOCAL);
152		if (nummnt<=0){
153		return NULL;
154		}
155		for(;nummnt--; mp++){
156	<	valid_type=0;
120	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
121	<	if(strcmp(mp->f_fstypename, fs_types[x]) ==0){
122	<	valid_type=1;
123	<	break;
124	<	}
125	<	}
156	>	valid_type = is_valid_fs_type(mp->f_fstypename);
157		#endif
158
159	<	#ifdef LINUX
159	>	#if defined(LINUX) || defined(CYGWIN)
160		if ((f=setmntent("/etc/mtab", "r" ))==NULL){
161		return NULL;
162		}
#	Line 135 | Line 166 | disk_stat_t *get_disk_stats(int *entries){
166		continue;
167		}
168
169	<	valid_type=0;
139	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
140	<	if(strcmp(mp->mnt_type, fs_types[x]) ==0){
141	<	valid_type=1;
142	<	break;
143	<	}
144	<	}
169	>	valid_type = is_valid_fs_type(mp->mnt_type);
170		#endif
171
172		#ifdef SOLARIS
#	Line 152 | Line 177 | disk_stat_t *get_disk_stats(int *entries){
177		if ((statvfs(mp.mnt_mountp, &fs)) !=0){
178		continue;
179		}
180	<	valid_type=0;
156	<	for(x=0;x<((sizeof(fs_types))/(sizeof(char*)));x++){
157	<	if(strcmp(mp.mnt_fstype, fs_types[x]) ==0){
158	<	valid_type=1;
159	<	break;
160	<	}
161	<	}
180	>	valid_type = is_valid_fs_type(mp.mnt_fstype);
181		#endif
182
183		if(valid_type){
#	Line 174 | Line 193 | disk_stat_t *get_disk_stats(int *entries){
193		}
194
195		disk_ptr=disk_stats+num_disks;
196	<	#ifdef FREEBSD
196	>	#ifdef ALLBSD
197		if((disk_ptr->device_name=copy_string(disk_ptr->device_name, mp->f_mntfromname))==NULL){
198		return NULL;
199		}
#	Line 196 | Line 215 | disk_stat_t *get_disk_stats(int *entries){
215		/* Freebsd doesn't have a "available" inodes */
216		disk_ptr->used_inodes=disk_ptr->total_inodes-disk_ptr->free_inodes;
217		#endif
218	<	#ifdef LINUX
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		}
#	Line 250 | Line 269 | disk_stat_t *get_disk_stats(int *entries){
269
270		*entries=num_disks;
271
272	<	/* If this fails, there is very little i can do about it, so i'll ignore it :) */
273	<	#if defined(LINUX) || defined(SOLARIS)
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
#	Line 306 | Line 329 | typedef struct {
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;
#	Line 317 | Line 342 | diskio_stat_t *get_diskio_stats(int *entries){
342		FILE *f;
343		char *line_ptr;
344		int major, minor;
320	–	char dev_letter;
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;
#	Line 333 | Line 358 | diskio_stat_t *get_diskio_stats(int *entries){
358		long sel_gen;
359		struct devstat *dev_ptr;
360		#endif
361	+	#ifdef NETBSD
362	+	struct disk_sysctl *stats;
363	+	#endif
364	+	#ifdef OPENBSD
365	+	struct diskstats *stats;
366	+	#endif
367	+	#ifdef NETBSD
368	+	#define MIBSIZE 3
369	+	#endif
370	+	#ifdef OPENBSD
371	+	#define MIBSIZE 2
372	+	#endif
373	+	#if defined(NETBSD) || defined(OPENBSD)
374	+	int num_disks, i;
375	+	int mib[MIBSIZE];
376	+	size_t size;
377	+	#endif
378	+
379		num_diskio=0;
380
381	+	#if defined(NETBSD) || defined(OPENBSD)
382	+	mib[0] = CTL_HW;
383	+	mib[1] = HW_DISKSTATS;
384	+	#ifdef NETBSD
385	+	mib[2] = sizeof(struct disk_sysctl);
386	+	#endif
387	+
388	+	if (sysctl(mib, MIBSIZE, NULL, &size, NULL, 0) < 0) {
389	+	return NULL;
390	+	}
391	+
392	+	#ifdef NETBSD
393	+	num_disks = size / sizeof(struct disk_sysctl);
394	+	#else
395	+	num_disks = size / sizeof(struct diskstats);
396	+	#endif
397	+
398	+	stats = malloc(size);
399	+	if (stats == NULL) {
400	+	return NULL;
401	+	}
402	+
403	+	if (sysctl(mib, MIBSIZE, stats, &size, NULL, 0) < 0) {
404	+	return NULL;
405	+	}
406	+
407	+	for (i = 0; i < num_disks; i++) {
408	+	u_int64_t rbytes, wbytes;
409	+
410	+	#ifdef NETBSD
411	+	#ifdef HAVE_DK_RBYTES
412	+	rbytes = stats[i].dk_rbytes;
413	+	wbytes = stats[i].dk_wbytes;
414	+	#else
415	+	/* Before 1.7, NetBSD merged reads and writes. */
416	+	rbytes = wbytes = stats[i].dk_bytes;
417	+	#endif
418	+	#else
419	+	rbytes = wbytes = stats[i].ds_bytes;
420	+	#endif
421	+
422	+	/* Don't keep stats for disks that have never been used. */
423	+	if (rbytes == 0 && wbytes == 0) {
424	+	continue;
425	+	}
426	+
427	+	diskio_stats = diskio_stat_malloc(num_diskio + 1,
428	+	&sizeof_diskio_stats,
429	+	diskio_stats);
430	+	if (diskio_stats == NULL) {
431	+	return NULL;
432	+	}
433	+	diskio_stats_ptr = diskio_stats + num_diskio;
434	+
435	+	diskio_stats_ptr->read_bytes = rbytes;
436	+	diskio_stats_ptr->write_bytes = wbytes;
437	+	if (diskio_stats_ptr->disk_name != NULL) {
438	+	free(diskio_stats_ptr->disk_name);
439	+	}
440	+	#ifdef NETBSD
441	+	diskio_stats_ptr->disk_name = strdup(stats[i].dk_name);
442	+	#else
443	+	asprintf((&diskio_stats_ptr->disk_name), "%s%d", "disk", i);
444	+	#endif
445	+	diskio_stats_ptr->systime = time(NULL);
446	+
447	+	num_diskio++;
448	+	}
449	+
450	+	free(stats);
451	+	#endif
452	+
453		#ifdef FREEBSD
454		if (!stats_init) {
455		stats.dinfo=malloc(sizeof(struct devinfo));
456		if(stats.dinfo==NULL) return NULL;
457	+	bzero(stats.dinfo, sizeof(struct devinfo));
458		stats_init = 1;
459		}
460	+	#ifdef FREEBSD5
461	+	if ((devstat_getdevs(NULL, &stats)) < 0) return NULL;
462	+	/* Not aware of a get all devices, so i said 999. If we ever
463	+	* find a machine with more than 999 disks, then i'll change
464	+	* this number :)
465	+	*/
466	+	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;
467	+	#else
468		if ((getdevs(&stats)) < 0) return NULL;
469		/* Not aware of a get all devices, so i said 999. If we ever
470		* find a machine with more than 999 disks, then i'll change
471		* this number :)
472		*/
473		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;
474	+	#endif
475
476		for(counter=0;counter<stats.dinfo->numdevs;counter++){
477		dev_ptr=&stats.dinfo->devices[dev_sel[counter].position];
#	Line 355 | Line 480 | diskio_stat_t *get_diskio_stats(int *entries){
480		* devices.. like mem, proc.. and also doesn't report floppy
481		* drives etc unless they are doing stuff :)
482		*/
483	+	#ifdef FREEBSD5
484	+	if((dev_ptr->bytes[DEVSTAT_READ]==0) && (dev_ptr->bytes[DEVSTAT_WRITE]==0)) continue;
485	+	#else
486		if((dev_ptr->bytes_read==0) && (dev_ptr->bytes_written==0)) continue;
487	+	#endif
488		if((diskio_stats=diskio_stat_malloc(num_diskio+1, &sizeof_diskio_stats, diskio_stats))==NULL){
489		return NULL;
490		}
491		diskio_stats_ptr=diskio_stats+num_diskio;
492	<
492	>
493	>	#ifdef FREEBSD5
494	>	diskio_stats_ptr->read_bytes=dev_ptr->bytes[DEVSTAT_READ];
495	>	diskio_stats_ptr->write_bytes=dev_ptr->bytes[DEVSTAT_WRITE];
496	>	#else
497		diskio_stats_ptr->read_bytes=dev_ptr->bytes_read;
498		diskio_stats_ptr->write_bytes=dev_ptr->bytes_written;
499	+	#endif
500		if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
501		asprintf((&diskio_stats_ptr->disk_name), "%s%d", dev_ptr->device_name, dev_ptr->unit_number);
502		diskio_stats_ptr->systime=time(NULL);
#	Line 370 | Line 504 | diskio_stat_t *get_diskio_stats(int *entries){
504		num_diskio++;
505		}
506		free(dev_sel);
373	–	free(stats.dinfo);
507
508		#endif
509		#ifdef SOLARIS
#	Line 399 | Line 532 | diskio_stat_t *get_diskio_stats(int *entries){
532
533		if(diskio_stats_ptr->disk_name!=NULL) free(diskio_stats_ptr->disk_name);
534
535	<	diskio_stats_ptr->disk_name=strdup(ksp->ks_name);
535	>	diskio_stats_ptr->disk_name=strdup((char *) get_svr_from_bsd(ksp->ks_name));
536		diskio_stats_ptr->systime=time(NULL);
537		num_diskio++;
538		}
#	Line 413 | Line 546 | diskio_stat_t *get_diskio_stats(int *entries){
546		n = 0;
547
548		/* Read /proc/partitions to find what devices exist. Recent 2.4 kernels
549	<	have statistics in here too, so we can use those directly. */
549	>	have statistics in here too, so we can use those directly.
550	>	2.6 kernels have /proc/diskstats instead with almost (but not quite)
551	>	the same format. */
552
553	<	f = fopen("/proc/partitions", "r");
553	>	f = fopen("/proc/diskstats", "r");
554	>	format = " %d %d %19s %*d %*d %lld %*d %*d %*d %lld";
555	>	if (f == NULL) {
556	>	f = fopen("/proc/partitions", "r");
557	>	format = " %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld";
558	>	}
559		if (f == NULL) goto out;
560		now = time(NULL);
561
#	Line 424 | Line 564 | diskio_stat_t *get_diskio_stats(int *entries){
564		char *s;
565		long long rsect, wsect;
566
567	<	int nr = sscanf(line_ptr,
428	<	" %d %d %*d %19s %*d %*d %lld %*d %*d %*d %lld",
567	>	int nr = sscanf(line_ptr, format,
568		&major, &minor, name, &rsect, &wsect);
569		if (nr < 3) continue;
431	–	if (nr < 5) {
432	–	has_pp_stats = 0;
433	–	rsect = 0;
434	–	wsect = 0;
435	–	}
570
571		/* Skip device names ending in numbers, since they're
572		partitions. */
#	Line 441 | Line 575 | diskio_stat_t *get_diskio_stats(int *entries){
575		--s;
576		if (*s >= '0' && *s <= '9') continue;
577
578	+	if (nr < 5) {
579	+	has_pp_stats = 0;
580	+	rsect = 0;
581	+	wsect = 0;
582	+	}
583	+
584		diskio_stats = diskio_stat_malloc(n + 1, &sizeof_diskio_stats,
585		diskio_stats);
586		if (diskio_stats == NULL) goto out;
#	Line 465 | Line 605 | diskio_stat_t *get_diskio_stats(int *entries){
605		n++;
606		}
607
608	+	fclose(f);
609	+	f = NULL;
610	+
611		if (!has_pp_stats) {
612	<	/* This is an older kernel without stats in /proc/partitions.
613	<	Read what we can from /proc/stat instead. */
612	>	/* This is an older kernel where /proc/partitions doesn't
613	>	contain stats. Read what we can from /proc/stat instead, and
614	>	fill in the appropriate bits of the list allocated above. */
615
616		f = fopen("/proc/stat", "r");
617		if (f == NULL) goto out;
#	Line 534 | Line 678 | diskio_stat_t *get_diskio_stats(int *entries){
678		num_diskio = n;
679		out:
680		if (f != NULL) fclose(f);
681	+	#endif
682
683	+	#ifdef CYGWIN
684	+	return NULL;
685		#endif
686	+
687		*entries=num_diskio;
688
689		return diskio_stats;
690		}
691
692		diskio_stat_t *get_diskio_stats_diff(int *entries){
693	<	static diskio_stat_t *diskio_stats_diff=NULL;
694	<	static int sizeof_diskio_stats_diff=0;
695	<	diskio_stat_t *diskio_stats_diff_ptr, *diskio_stats_ptr;
696	<	int disks, x, y;
693	>	static diskio_stat_t *diff = NULL;
694	>	static int diff_count = 0;
695	>	diskio_stat_t *src, *dest;
696	>	int i, j, new_count;
697
698	<	if(diskio_stats==NULL){
699	<	diskio_stats_ptr=get_diskio_stats(&disks);
700	<	*entries=disks;
553	<	return diskio_stats_ptr;
698	>	if (diskio_stats == NULL) {
699	>	/* No previous stats, so we can't calculate a difference. */
700	>	return get_diskio_stats(entries);
701		}
702
703	<	diskio_stats_diff=diskio_stat_malloc(num_diskio, &sizeof_diskio_stats_diff, diskio_stats_diff);
704	<	if(diskio_stats_diff==NULL){
703	>	/* Resize the results array to match the previous stats. */
704	>	diff = diskio_stat_malloc(num_diskio, &diff_count, diff);
705	>	if (diff == NULL) {
706		return NULL;
707		}
708
709	<	diskio_stats_diff_ptr=diskio_stats_diff;
710	<	diskio_stats_ptr=diskio_stats;
709	>	/* Copy the previous stats into the result. */
710	>	for (i = 0; i < diff_count; i++) {
711	>	src = &diskio_stats[i];
712	>	dest = &diff[i];
713
714	<	for(disks=0;disks<num_diskio;disks++){
715	<	if(diskio_stats_diff_ptr->disk_name!=NULL){
566	<	free(diskio_stats_diff_ptr->disk_name);
714	>	if (dest->disk_name != NULL) {
715	>	free(dest->disk_name);
716		}
717	<	diskio_stats_diff_ptr->disk_name=strdup(diskio_stats_ptr->disk_name);
718	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes;
719	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes;
720	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime;
717	>	dest->disk_name = strdup(src->disk_name);
718	>	dest->read_bytes = src->read_bytes;
719	>	dest->write_bytes = src->write_bytes;
720	>	dest->systime = src->systime;
721	>	}
722
723	<	diskio_stats_diff_ptr++;
724	<	diskio_stats_ptr++;
723	>	/* Get a new set of stats. */
724	>	if (get_diskio_stats(&new_count) == NULL) {
725	>	return NULL;
726		}
727
728	<	diskio_stats_ptr=get_diskio_stats(&disks);
729	<	diskio_stats_diff_ptr=diskio_stats_diff;
728	>	/* For each previous stat... */
729	>	for (i = 0; i < diff_count; i++) {
730	>	dest = &diff[i];
731
732	<	for(x=0;x<sizeof_diskio_stats_diff;x++){
733	<
734	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
735	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
736	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
737	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
738	<	}else{
587	<	diskio_stats_ptr=diskio_stats;
588	<	for(y=0;y<disks;y++){
589	<	if((strcmp(diskio_stats_diff_ptr->disk_name, diskio_stats_ptr->disk_name))==0){
590	<	diskio_stats_diff_ptr->read_bytes=diskio_stats_ptr->read_bytes-diskio_stats_diff_ptr->read_bytes;
591	<	diskio_stats_diff_ptr->write_bytes=diskio_stats_ptr->write_bytes-diskio_stats_diff_ptr->write_bytes;
592	<	diskio_stats_diff_ptr->systime=diskio_stats_ptr->systime-diskio_stats_diff_ptr->systime;
593	<
594	<	break;
595	<	}
596	<
597	<	diskio_stats_ptr++;
732	>	/* ... find the corresponding new stat ... */
733	>	for (j = 0; j < new_count; j++) {
734	>	/* Try the new stat in the same position first,
735	>	since that's most likely to be it. */
736	>	src = &diskio_stats[(i + j) % new_count];
737	>	if (strcmp(src->disk_name, dest->disk_name) == 0) {
738	>	break;
739		}
740		}
741	+	if (j == new_count) {
742	+	/* No match found. */
743	+	continue;
744	+	}
745
746	<	diskio_stats_ptr++;
747	<	diskio_stats_diff_ptr++;
748	<
746	>	/* ... and subtract the previous stat from it to get the
747	>	difference. */
748	>	dest->read_bytes = src->read_bytes - dest->read_bytes;
749	>	dest->write_bytes = src->write_bytes - dest->write_bytes;
750	>	dest->systime = src->systime - dest->systime;
751		}
752	<
753	<	*entries=sizeof_diskio_stats_diff;
754	<	return diskio_stats_diff;
752	>
753	>	*entries = diff_count;
754	>	return diff;
755		}
756	+

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