static void dasd_stats_all_block_reset(void)
{
int i;
struct dasd_device *device;
for (i = 0; i < dasd_max_devindex; ++i) {
device = dasd_device_from_devindex(i);
if (IS_ERR(device))
continue;
if (device->block)
dasd_profile_reset(&device->block->profile);
dasd_put_device(device);
}
}
/*
* Reset device profile information
*/
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
dasd_profile_reset(&block->profile);
return 0;
}
static ssize_t dasd_stats_proc_write(struct file *file,
const char __user *user_buf, size_t user_len, loff_t *pos)
{
#ifdef CONFIG_DASD_PROFILE
char *buffer, *str;
int rc;
if (user_len > 65536)
user_len = 65536;
buffer = dasd_get_user_string(user_buf, user_len);
if (IS_ERR(buffer))
return PTR_ERR(buffer);
/* check for valid verbs */
str = skip_spaces(buffer);
if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
/* 'set xxx' was given */
str = skip_spaces(str + 4);
if (strcmp(str, "on") == 0) {
/* switch on statistics profiling */
rc = dasd_stats_all_block_on();
if (rc) {
dasd_stats_all_block_off();
goto out_error;
}
rc = dasd_profile_on(&dasd_global_profile);
if (rc) {
dasd_stats_all_block_off();
goto out_error;
}
dasd_profile_reset(&dasd_global_profile);
dasd_global_profile_level = DASD_PROFILE_ON;
pr_info("The statistics feature has been switched "
"on\n");
} else if (strcmp(str, "off") == 0) {
/* switch off statistics profiling */
dasd_global_profile_level = DASD_PROFILE_OFF;
dasd_profile_off(&dasd_global_profile);
dasd_stats_all_block_off();
pr_info("The statistics feature has been switched "
"off\n");
} else
goto out_parse_error;
} else if (strncmp(str, "reset", 5) == 0) {
/* reset the statistics */
dasd_profile_reset(&dasd_global_profile);
dasd_stats_all_block_reset();
pr_info("The statistics have been reset\n");
} else
goto out_parse_error;
vfree(buffer);
return user_len;
out_parse_error:
rc = -EINVAL;
pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
out_error:
vfree(buffer);
return rc;
#else
pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
return user_len;
#endif /* CONFIG_DASD_PROFILE */
}