/*
***************************************************************************
* Allocate and init structures, according to system state.
***************************************************************************
*/
void io_sys_init(void)
{
/* Allocate and init stat common counters */
init_stats();
/* How many processors on this machine? */
cpu_nr = get_cpu_nr(~0, FALSE);
/* Get number of block devices and partitions in /proc/diskstats */
if ((iodev_nr = get_diskstats_dev_nr(CNT_PART, CNT_ALL_DEV)) > 0) {
flags |= I_F_HAS_DISKSTATS;
iodev_nr += NR_DEV_PREALLOC;
}
if (!HAS_DISKSTATS(flags) ||
(DISPLAY_PARTITIONS(flags) && !DISPLAY_PART_ALL(flags))) {
/*
* If /proc/diskstats exists but we also want stats for the partitions
* of a particular device, stats will have to be found in /sys. So we
* need to know if /sys is mounted or not, and set flags accordingly.
*/
/* Get number of block devices (and partitions) in sysfs */
if ((iodev_nr = get_sysfs_dev_nr(DISPLAY_PARTITIONS(flags))) > 0) {
flags |= I_F_HAS_SYSFS;
iodev_nr += NR_DEV_PREALLOC;
}
else {
fprintf(stderr, _("Cannot find disk data\n"));
exit(2);
}
}
/* Also allocate stat structures for "group" devices */
iodev_nr += group_nr;
/*
* Allocate structures for number of disks found, but also
* for groups of devices if option -g has been entered on the command line.
* iodev_nr must be <> 0.
*/
salloc_device(iodev_nr);
}
/*
***************************************************************************
* Allocate and init structures, according to system state
***************************************************************************
*/
void io_sys_init(int *flags)
{
int i;
/* Init stat common counters */
init_stats();
/* How many processors on this machine ? */
cpu_nr = get_cpu_nr(~0);
/* Get number of block devices and partitions in /proc/diskstats */
if ((iodev_nr = get_diskstats_dev_nr(CNT_PART, CNT_ALL_DEV)) > 0) {
*flags |= I_F_HAS_DISKSTATS;
iodev_nr += NR_DEV_PREALLOC;
}
if (!HAS_DISKSTATS(*flags) ||
(DISPLAY_PARTITIONS(*flags) && !DISPLAY_PART_ALL(*flags))) {
/*
* If /proc/diskstats exists but we also want stats for the partitions
* of a particular device, stats will have to be found in /sys. So we
* need to know if /sys is mounted or not, and set *flags accordingly.
*/
/* Get number of block devices (and partitions) in sysfs */
if ((iodev_nr = get_sysfs_dev_nr(DISPLAY_PARTITIONS(*flags))) > 0) {
*flags |= I_F_HAS_SYSFS;
iodev_nr += NR_DEV_PREALLOC;
}
/*
* Get number of block devices and partitions in /proc/partitions,
* those with statistics...
*/
else if ((iodev_nr = get_ppartitions_dev_nr(CNT_PART)) > 0) {
*flags |= I_F_HAS_PPARTITIONS;
iodev_nr += NR_DEV_PREALLOC;
}
/* Get number of "disk_io:" entries in /proc/stat */
else if ((iodev_nr = get_disk_io_nr()) > 0) {
*flags |= I_F_PLAIN_KERNEL24;
iodev_nr += NR_DISK_PREALLOC;
}
else {
/* Assume we have an old kernel: stats for 4 disks are in /proc/stat */
iodev_nr = 4;
*flags |= I_F_OLD_KERNEL;
}
}
/*
* Allocate structures for number of disks found.
* iodev_nr must be <> 0.
*/
salloc_device(iodev_nr);
if (HAS_OLD_KERNEL(*flags)) {
struct io_hdr_stats *shi = st_hdr_iodev;
/*
* If we have an old kernel with the stats for the first four disks
* in /proc/stat, then set the devices names to hdisk[0..3].
*/
for (i = 0; i < 4; i++, shi++) {
shi->used = TRUE;
sprintf(shi->name, "%s%d", K_HDISK, i);
}
}
}