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path: root/drivers/s390/block/dasd_proc.c
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Diffstat (limited to 'drivers/s390/block/dasd_proc.c')
-rw-r--r--drivers/s390/block/dasd_proc.c106
1 files changed, 71 insertions, 35 deletions
diff --git a/drivers/s390/block/dasd_proc.c b/drivers/s390/block/dasd_proc.c
index c4a6a31bd9cd..6c3c5364d082 100644
--- a/drivers/s390/block/dasd_proc.c
+++ b/drivers/s390/block/dasd_proc.c
@@ -32,28 +32,6 @@ static struct proc_dir_entry *dasd_proc_root_entry = NULL;
static struct proc_dir_entry *dasd_devices_entry = NULL;
static struct proc_dir_entry *dasd_statistics_entry = NULL;
-#ifdef CONFIG_DASD_PROFILE
-static char *
-dasd_get_user_string(const char __user *user_buf, size_t user_len)
-{
- char *buffer;
-
- buffer = kmalloc(user_len + 1, GFP_KERNEL);
- if (buffer == NULL)
- return ERR_PTR(-ENOMEM);
- if (copy_from_user(buffer, user_buf, user_len) != 0) {
- kfree(buffer);
- return ERR_PTR(-EFAULT);
- }
- /* got the string, now strip linefeed. */
- if (buffer[user_len - 1] == '\n')
- buffer[user_len - 1] = 0;
- else
- buffer[user_len] = 0;
- return buffer;
-}
-#endif /* CONFIG_DASD_PROFILE */
-
static int
dasd_devices_show(struct seq_file *m, void *v)
{
@@ -167,6 +145,55 @@ static const struct file_operations dasd_devices_file_ops = {
};
#ifdef CONFIG_DASD_PROFILE
+static int dasd_stats_all_block_on(void)
+{
+ int i, rc;
+ struct dasd_device *device;
+
+ rc = 0;
+ for (i = 0; i < dasd_max_devindex; ++i) {
+ device = dasd_device_from_devindex(i);
+ if (IS_ERR(device))
+ continue;
+ if (device->block)
+ rc = dasd_profile_on(&device->block->profile);
+ dasd_put_device(device);
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+static void dasd_stats_all_block_off(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_off(&device->block->profile);
+ dasd_put_device(device);
+ }
+}
+
+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);
+ }
+}
+
static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
{
int i;
@@ -183,18 +210,18 @@ static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int f
static int dasd_stats_proc_show(struct seq_file *m, void *v)
{
#ifdef CONFIG_DASD_PROFILE
- struct dasd_profile_info_t *prof;
+ struct dasd_profile_info *prof;
int factor;
/* check for active profiling */
- if (dasd_profile_level == DASD_PROFILE_OFF) {
+ if (!dasd_global_profile_level) {
seq_printf(m, "Statistics are off - they might be "
"switched on using 'echo set on > "
"/proc/dasd/statistics'\n");
return 0;
}
+ prof = &dasd_global_profile_data;
- prof = &dasd_global_profile;
/* prevent counter 'overflow' on output */
for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
factor *= 10);
@@ -245,6 +272,7 @@ static ssize_t dasd_stats_proc_write(struct file *file,
{
#ifdef CONFIG_DASD_PROFILE
char *buffer, *str;
+ int rc;
if (user_len > 65536)
user_len = 65536;
@@ -259,32 +287,40 @@ static ssize_t dasd_stats_proc_write(struct file *file,
str = skip_spaces(str + 4);
if (strcmp(str, "on") == 0) {
/* switch on statistics profiling */
- dasd_profile_level = DASD_PROFILE_ON;
+ rc = dasd_stats_all_block_on();
+ if (rc) {
+ dasd_stats_all_block_off();
+ goto out_error;
+ }
+ dasd_global_profile_reset();
+ 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 and reset statistics profiling */
- memset(&dasd_global_profile,
- 0, sizeof (struct dasd_profile_info_t));
- dasd_profile_level = DASD_PROFILE_OFF;
+ dasd_global_profile_level = DASD_PROFILE_OFF;
+ dasd_global_profile_reset();
+ dasd_stats_all_block_off();
pr_info("The statistics feature has been switched "
"off\n");
} else
- goto out_error;
+ goto out_parse_error;
} else if (strncmp(str, "reset", 5) == 0) {
/* reset the statistics */
- memset(&dasd_global_profile, 0,
- sizeof (struct dasd_profile_info_t));
+ dasd_global_profile_reset();
+ dasd_stats_all_block_reset();
pr_info("The statistics have been reset\n");
} else
- goto out_error;
+ goto out_parse_error;
kfree(buffer);
return user_len;
-out_error:
+out_parse_error:
+ rc = -EINVAL;
pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
str);
+out_error:
kfree(buffer);
- return -EINVAL;
+ return rc;
#else
pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
return user_len;