[linux-2.6-block.git] / drivers / s390 / block / dasd_proc.c

/*
 * File...........: linux/drivers/s390/block/dasd_proc.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
 *		    Carsten Otte <Cotte@de.ibm.com>
 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
 *
 * /proc interface for the dasd driver.
 *
 */

#define KMSG_COMPONENT "dasd"

#include <linux/ctype.h>
#include <linux/string.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>

#include <asm/debug.h>
#include <asm/uaccess.h>

/* This is ugly... */
#define PRINTK_HEADER "dasd_proc:"

#include "dasd_int.h"

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)
{
	struct dasd_device *device;
	struct dasd_block *block;
	char *substr;

	device = dasd_device_from_devindex((unsigned long) v - 1);
	if (IS_ERR(device))
		return 0;
	if (device->block)
		block = device->block;
	else {
		dasd_put_device(device);
		return 0;
	}
	/* Print device number. */
	seq_printf(m, "%s", dev_name(&device->cdev->dev));
	/* Print discipline string. */
	if (device != NULL && device->discipline != NULL)
		seq_printf(m, "(%s)", device->discipline->name);
	else
		seq_printf(m, "(none)");
	/* Print kdev. */
	if (block->gdp)
		seq_printf(m, " at (%3d:%6d)",
			   MAJOR(disk_devt(block->gdp)),
			   MINOR(disk_devt(block->gdp)));
	else
		seq_printf(m, "  at (???:??????)");
	/* Print device name. */
	if (block->gdp)
		seq_printf(m, " is %-8s", block->gdp->disk_name);
	else
		seq_printf(m, " is ????????");
	/* Print devices features. */
	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
	seq_printf(m, "%4s: ", substr);
	/* Print device status information. */
	switch ((device != NULL) ? device->state : -1) {
	case -1:
		seq_printf(m, "unknown");
		break;
	case DASD_STATE_NEW:
		seq_printf(m, "new");
		break;
	case DASD_STATE_KNOWN:
		seq_printf(m, "detected");
		break;
	case DASD_STATE_BASIC:
		seq_printf(m, "basic");
		break;
	case DASD_STATE_UNFMT:
		seq_printf(m, "unformatted");
		break;
	case DASD_STATE_READY:
	case DASD_STATE_ONLINE:
		seq_printf(m, "active ");
		if (dasd_check_blocksize(block->bp_block))
			seq_printf(m, "n/f	 ");
		else
			seq_printf(m,
				   "at blocksize: %d, %lld blocks, %lld MB",
				   block->bp_block, block->blocks,
				   ((block->bp_block >> 9) *
				    block->blocks) >> 11);
		break;
	default:
		seq_printf(m, "no stat");
		break;
	}
	dasd_put_device(device);
	if (dasd_probeonly)
		seq_printf(m, "(probeonly)");
	seq_printf(m, "\n");
	return 0;
}

static void *dasd_devices_start(struct seq_file *m, loff_t *pos)
{
	if (*pos >= dasd_max_devindex)
		return NULL;
	return (void *)((unsigned long) *pos + 1);
}

static void *dasd_devices_next(struct seq_file *m, void *v, loff_t *pos)
{
	++*pos;
	return dasd_devices_start(m, pos);
}

static void dasd_devices_stop(struct seq_file *m, void *v)
{
}

static const struct seq_operations dasd_devices_seq_ops = {
	.start		= dasd_devices_start,
	.next		= dasd_devices_next,
	.stop		= dasd_devices_stop,
	.show		= dasd_devices_show,
};

static int dasd_devices_open(struct inode *inode, struct file *file)
{
	return seq_open(file, &dasd_devices_seq_ops);
}

static const struct file_operations dasd_devices_file_ops = {
	.owner		= THIS_MODULE,
	.open		= dasd_devices_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= seq_release,
};

static int
dasd_calc_metrics(char *page, char **start, off_t off,
		  int count, int *eof, int len)
{
	len = (len > off) ? len - off : 0;
	if (len > count)
		len = count;
	if (len < count)
		*eof = 1;
	*start = page + off;
	return len;
}

#ifdef CONFIG_DASD_PROFILE
static char *
dasd_statistics_array(char *str, unsigned int *array, int factor)
{
	int i;

	for (i = 0; i < 32; i++) {
		str += sprintf(str, "%7d ", array[i] / factor);
		if (i == 15)
			str += sprintf(str, "\n");
	}
	str += sprintf(str,"\n");
	return str;
}
#endif /* CONFIG_DASD_PROFILE */

static int
dasd_statistics_read(char *page, char **start, off_t off,
		     int count, int *eof, void *data)
{
	unsigned long len;
#ifdef CONFIG_DASD_PROFILE
	struct dasd_profile_info_t *prof;
	char *str;
	int factor;

	/* check for active profiling */
	if (dasd_profile_level == DASD_PROFILE_OFF) {
		len = sprintf(page, "Statistics are off - they might be "
				    "switched on using 'echo set on > "
				    "/proc/dasd/statistics'\n");
		return dasd_calc_metrics(page, start, off, count, eof, len);
	}

	prof = &dasd_global_profile;
	/* prevent counter 'overflow' on output */
	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
	     factor *= 10);

	str = page;
	str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
	str += sprintf(str, "with %u sectors(512B each)\n",
		       prof->dasd_io_sects);
	str += sprintf(str, "Scale Factor is  %d\n", factor);
	str += sprintf(str,
		       "   __<4	   ___8	   __16	   __32	   __64	   _128	"
		       "   _256	   _512	   __1k	   __2k	   __4k	   __8k	"
		       "   _16k	   _32k	   _64k	   128k\n");
	str += sprintf(str,
		       "   _256	   _512	   __1M	   __2M	   __4M	   __8M	"
		       "   _16M	   _32M	   _64M	   128M	   256M	   512M	"
		       "   __1G	   __2G	   __4G " "   _>4G\n");

	str += sprintf(str, "Histogram of sizes (512B secs)\n");
	str = dasd_statistics_array(str, prof->dasd_io_secs, factor);
	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
	str = dasd_statistics_array(str, prof->dasd_io_times, factor);
	str += sprintf(str, "Histogram of I/O times per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_timps, factor);
	str += sprintf(str, "Histogram of I/O time till ssch\n");
	str = dasd_statistics_array(str, prof->dasd_io_time1, factor);
	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2, factor);
	str += sprintf(str, "Histogram of I/O time between ssch "
			    "and irq per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor);
	str += sprintf(str, "Histogram of I/O time between irq and end\n");
	str = dasd_statistics_array(str, prof->dasd_io_time3, factor);
	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
	str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);
	len = str - page;
#else
	len = sprintf(page, "Statistics are not activated in this kernel\n");
#endif
	return dasd_calc_metrics(page, start, off, count, eof, len);
}

static int
dasd_statistics_write(struct file *file, const char __user *user_buf,
		      unsigned long user_len, void *data)
{
#ifdef CONFIG_DASD_PROFILE
	char *buffer, *str;

	if (user_len > 65536)
		user_len = 65536;
	buffer = dasd_get_user_string(user_buf, user_len);
	if (IS_ERR(buffer))
		return PTR_ERR(buffer);
	DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", 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 */
			dasd_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;
			pr_info("The statistics feature has been switched "
				"off\n");
		} else
			goto out_error;
	} else if (strncmp(str, "reset", 5) == 0) {
		/* reset the statistics */
		memset(&dasd_global_profile, 0,
		       sizeof (struct dasd_profile_info_t));
		pr_info("The statistics have been reset\n");
	} else
		goto out_error;
	kfree(buffer);
	return user_len;
out_error:
	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
		str);
	kfree(buffer);
	return -EINVAL;
#else
	pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
	return user_len;
#endif				/* CONFIG_DASD_PROFILE */
}

/*
 * Create dasd proc-fs entries.
 * In case creation failed, cleanup and return -ENOENT.
 */
int
dasd_proc_init(void)
{
	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
	if (!dasd_proc_root_entry)
		goto out_nodasd;
	dasd_devices_entry = proc_create("devices",
					 S_IFREG | S_IRUGO | S_IWUSR,
					 dasd_proc_root_entry,
					 &dasd_devices_file_ops);
	if (!dasd_devices_entry)
		goto out_nodevices;
	dasd_statistics_entry = create_proc_entry("statistics",
						  S_IFREG | S_IRUGO | S_IWUSR,
						  dasd_proc_root_entry);
	if (!dasd_statistics_entry)
		goto out_nostatistics;
	dasd_statistics_entry->read_proc = dasd_statistics_read;
	dasd_statistics_entry->write_proc = dasd_statistics_write;
	return 0;

 out_nostatistics:
	remove_proc_entry("devices", dasd_proc_root_entry);
 out_nodevices:
	remove_proc_entry("dasd", NULL);
 out_nodasd:
	return -ENOENT;
}

void
dasd_proc_exit(void)
{
	remove_proc_entry("devices", dasd_proc_root_entry);
	remove_proc_entry("statistics", dasd_proc_root_entry);
	remove_proc_entry("dasd", NULL);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* File...........: linux/drivers/s390/block/dasd_proc.c
	3	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	4	* Horst Hummel <Horst.Hummel@de.ibm.com>
	5	* Carsten Otte <Cotte@de.ibm.com>
	6	* Martin Schwidefsky <schwidefsky@de.ibm.com>
	7	* Bugreports.to..: <Linux390@de.ibm.com>
	8	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2002
	9	*
	10	* /proc interface for the dasd driver.
	11	*
1da177e4 LT	12	*/
1da177e4 LT	13
fc19f381 SH	14	#define KMSG_COMPONENT "dasd"
fc19f381 SH	15
1da177e4	16	#include <linux/ctype.h>
e7d2860b	17	#include <linux/string.h>
1da177e4 LT	18	#include <linux/seq_file.h>
1da177e4 LT	19	#include <linux/vmalloc.h>
66a464db	20	#include <linux/proc_fs.h>
1da177e4 LT	21
	22	#include <asm/debug.h>
	23	#include <asm/uaccess.h>
	24
	25	/* This is ugly... */
	26	#define PRINTK_HEADER "dasd_proc:"
	27
	28	#include "dasd_int.h"
	29
	30	static struct proc_dir_entry *dasd_proc_root_entry = NULL;
	31	static struct proc_dir_entry *dasd_devices_entry = NULL;
	32	static struct proc_dir_entry *dasd_statistics_entry = NULL;
	33
3d62149f	34	#ifdef CONFIG_DASD_PROFILE
4d284cac	35	static char *
1da177e4 LT	36	dasd_get_user_string(const char __user *user_buf, size_t user_len)
	37	{
	38	char *buffer;
	39
	40	buffer = kmalloc(user_len + 1, GFP_KERNEL);
	41	if (buffer == NULL)
	42	return ERR_PTR(-ENOMEM);
	43	if (copy_from_user(buffer, user_buf, user_len) != 0) {
	44	kfree(buffer);
	45	return ERR_PTR(-EFAULT);
	46	}
	47	/* got the string, now strip linefeed. */
	48	if (buffer[user_len - 1] == '\n')
	49	buffer[user_len - 1] = 0;
	50	else
	51	buffer[user_len] = 0;
	52	return buffer;
	53	}
3d62149f	54	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	55
	56	static int
	57	dasd_devices_show(struct seq_file m, void v)
	58	{
	59	struct dasd_device *device;
8e09f215	60	struct dasd_block *block;
1da177e4 LT	61	char *substr;
	62
	63	device = dasd_device_from_devindex((unsigned long) v - 1);
	64	if (IS_ERR(device))
	65	return 0;
8e09f215 SW	66	if (device->block)
8e09f215 SW	67	block = device->block;
a5e23839 SW	68	else {
a5e23839 SW	69	dasd_put_device(device);
8e09f215	70	return 0;
a5e23839	71	}
1da177e4	72	/* Print device number. */
2a0217d5	73	seq_printf(m, "%s", dev_name(&device->cdev->dev));
1da177e4 LT	74	/* Print discipline string. */
	75	if (device != NULL && device->discipline != NULL)
	76	seq_printf(m, "(%s)", device->discipline->name);
	77	else
	78	seq_printf(m, "(none)");
	79	/* Print kdev. */
8e09f215	80	if (block->gdp)
1da177e4	81	seq_printf(m, " at (%3d:%6d)",
f331c029 TH	82	MAJOR(disk_devt(block->gdp)),
f331c029 TH	83	MINOR(disk_devt(block->gdp)));
1da177e4 LT	84	else
	85	seq_printf(m, " at (???:??????)");
	86	/* Print device name. */
8e09f215 SW	87	if (block->gdp)
8e09f215 SW	88	seq_printf(m, " is %-8s", block->gdp->disk_name);
1da177e4 LT	89	else
	90	seq_printf(m, " is ????????");
	91	/* Print devices features. */
c6eb7b77	92	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
1da177e4 LT	93	seq_printf(m, "%4s: ", substr);
	94	/* Print device status information. */
	95	switch ((device != NULL) ? device->state : -1) {
	96	case -1:
	97	seq_printf(m, "unknown");
	98	break;
	99	case DASD_STATE_NEW:
	100	seq_printf(m, "new");
	101	break;
	102	case DASD_STATE_KNOWN:
	103	seq_printf(m, "detected");
	104	break;
	105	case DASD_STATE_BASIC:
	106	seq_printf(m, "basic");
	107	break;
90f0094d	108	case DASD_STATE_UNFMT:
b707dbe6	109	seq_printf(m, "unformatted");
90f0094d	110	break;
1da177e4 LT	111	case DASD_STATE_READY:
	112	case DASD_STATE_ONLINE:
	113	seq_printf(m, "active ");
8e09f215	114	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	115	seq_printf(m, "n/f ");
	116	else
	117	seq_printf(m,
b44b0ab3	118	"at blocksize: %d, %lld blocks, %lld MB",
8e09f215 SW	119	block->bp_block, block->blocks,
	120	((block->bp_block >> 9) *
	121	block->blocks) >> 11);
1da177e4 LT	122	break;
	123	default:
	124	seq_printf(m, "no stat");
	125	break;
	126	}
	127	dasd_put_device(device);
	128	if (dasd_probeonly)
	129	seq_printf(m, "(probeonly)");
	130	seq_printf(m, "\n");
	131	return 0;
	132	}
	133
	134	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	135	{
	136	if (*pos >= dasd_max_devindex)
	137	return NULL;
	138	return (void )((unsigned long) pos + 1);
	139	}
	140
	141	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	142	{
	143	++*pos;
	144	return dasd_devices_start(m, pos);
	145	}
	146
	147	static void dasd_devices_stop(struct seq_file m, void v)
	148	{
	149	}
	150
5c81cdbe	151	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	152	.start = dasd_devices_start,
	153	.next = dasd_devices_next,
	154	.stop = dasd_devices_stop,
	155	.show = dasd_devices_show,
	156	};
	157
	158	static int dasd_devices_open(struct inode inode, struct file file)
	159	{
	160	return seq_open(file, &dasd_devices_seq_ops);
	161	}
	162
d54b1fdb	163	static const struct file_operations dasd_devices_file_ops = {
8b594007	164	.owner = THIS_MODULE,
1da177e4 LT	165	.open = dasd_devices_open,
	166	.read = seq_read,
	167	.llseek = seq_lseek,
	168	.release = seq_release,
	169	};
	170
4d284cac	171	static int
1da177e4 LT	172	dasd_calc_metrics(char page, char *start, off_t off,
	173	int count, int *eof, int len)
	174	{
	175	len = (len > off) ? len - off : 0;
	176	if (len > count)
	177	len = count;
	178	if (len < count)
	179	*eof = 1;
	180	*start = page + off;
	181	return len;
	182	}
	183
3d62149f	184	#ifdef CONFIG_DASD_PROFILE
4d284cac	185	static char *
2bf373b3	186	dasd_statistics_array(char str, unsigned int array, int factor)
1da177e4 LT	187	{
	188	int i;
	189
	190	for (i = 0; i < 32; i++) {
2bf373b3	191	str += sprintf(str, "%7d ", array[i] / factor);
1da177e4 LT	192	if (i == 15)
	193	str += sprintf(str, "\n");
	194	}
	195	str += sprintf(str,"\n");
	196	return str;
	197	}
3d62149f	198	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	199
	200	static int
	201	dasd_statistics_read(char page, char *start, off_t off,
	202	int count, int eof, void data)
	203	{
	204	unsigned long len;
	205	#ifdef CONFIG_DASD_PROFILE
	206	struct dasd_profile_info_t *prof;
	207	char *str;
2bf373b3	208	int factor;
1da177e4 LT	209
	210	/* check for active profiling */
	211	if (dasd_profile_level == DASD_PROFILE_OFF) {
	212	len = sprintf(page, "Statistics are off - they might be "
	213	"switched on using 'echo set on > "
	214	"/proc/dasd/statistics'\n");
	215	return dasd_calc_metrics(page, start, off, count, eof, len);
	216	}
	217
	218	prof = &dasd_global_profile;
fbfecd37	219	/* prevent counter 'overflow' on output */
2bf373b3 SH	220	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
2bf373b3 SH	221	factor *= 10);
1da177e4 LT	222
	223	str = page;
	224	str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
2bf373b3	225	str += sprintf(str, "with %u sectors(512B each)\n",
1da177e4	226	prof->dasd_io_sects);
2bf373b3	227	str += sprintf(str, "Scale Factor is %d\n", factor);
1da177e4 LT	228	str += sprintf(str,
	229	" __<4 ___8 __16 __32 __64 _128 "
	230	" _256 _512 __1k __2k __4k __8k "
	231	" _16k _32k _64k 128k\n");
	232	str += sprintf(str,
	233	" _256 _512 __1M __2M __4M __8M "
	234	" _16M _32M _64M 128M 256M 512M "
	235	" __1G __2G __4G " " _>4G\n");
	236
	237	str += sprintf(str, "Histogram of sizes (512B secs)\n");
2bf373b3	238	str = dasd_statistics_array(str, prof->dasd_io_secs, factor);
1da177e4	239	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
2bf373b3	240	str = dasd_statistics_array(str, prof->dasd_io_times, factor);
1da177e4	241	str += sprintf(str, "Histogram of I/O times per sector\n");
2bf373b3	242	str = dasd_statistics_array(str, prof->dasd_io_timps, factor);
1da177e4	243	str += sprintf(str, "Histogram of I/O time till ssch\n");
2bf373b3	244	str = dasd_statistics_array(str, prof->dasd_io_time1, factor);
1da177e4	245	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
2bf373b3	246	str = dasd_statistics_array(str, prof->dasd_io_time2, factor);
1da177e4 LT	247	str += sprintf(str, "Histogram of I/O time between ssch "
1da177e4 LT	248	"and irq per sector\n");
2bf373b3	249	str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor);
1da177e4	250	str += sprintf(str, "Histogram of I/O time between irq and end\n");
2bf373b3	251	str = dasd_statistics_array(str, prof->dasd_io_time3, factor);
1da177e4	252	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
2bf373b3	253	str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);
1da177e4 LT	254	len = str - page;
	255	#else
	256	len = sprintf(page, "Statistics are not activated in this kernel\n");
	257	#endif
	258	return dasd_calc_metrics(page, start, off, count, eof, len);
	259	}
	260
	261	static int
	262	dasd_statistics_write(struct file file, const char __user user_buf,
	263	unsigned long user_len, void *data)
	264	{
	265	#ifdef CONFIG_DASD_PROFILE
	266	char buffer, str;
	267
	268	if (user_len > 65536)
	269	user_len = 65536;
	270	buffer = dasd_get_user_string(user_buf, user_len);
	271	if (IS_ERR(buffer))
	272	return PTR_ERR(buffer);
fc19f381	273	DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
1da177e4 LT	274
1da177e4 LT	275	/* check for valid verbs */
e7d2860b	276	str = skip_spaces(buffer);
1da177e4 LT	277	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
1da177e4 LT	278	/* 'set xxx' was given */
e7d2860b	279	str = skip_spaces(str + 4);
1da177e4 LT	280	if (strcmp(str, "on") == 0) {
	281	/* switch on statistics profiling */
	282	dasd_profile_level = DASD_PROFILE_ON;
fc19f381 SH	283	pr_info("The statistics feature has been switched "
fc19f381 SH	284	"on\n");
1da177e4 LT	285	} else if (strcmp(str, "off") == 0) {
	286	/* switch off and reset statistics profiling */
	287	memset(&dasd_global_profile,
	288	0, sizeof (struct dasd_profile_info_t));
	289	dasd_profile_level = DASD_PROFILE_OFF;
fc19f381 SH	290	pr_info("The statistics feature has been switched "
fc19f381 SH	291	"off\n");
1da177e4 LT	292	} else
	293	goto out_error;
	294	} else if (strncmp(str, "reset", 5) == 0) {
	295	/* reset the statistics */
	296	memset(&dasd_global_profile, 0,
	297	sizeof (struct dasd_profile_info_t));
fc19f381	298	pr_info("The statistics have been reset\n");
1da177e4 LT	299	} else
	300	goto out_error;
	301	kfree(buffer);
	302	return user_len;
	303	out_error:
fc19f381 SH	304	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
fc19f381 SH	305	str);
1da177e4 LT	306	kfree(buffer);
	307	return -EINVAL;
	308	#else
fc19f381	309	pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
1da177e4 LT	310	return user_len;
	311	#endif /* CONFIG_DASD_PROFILE */
	312	}
	313
7220fe8b HH	314	/*
	315	* Create dasd proc-fs entries.
	316	* In case creation failed, cleanup and return -ENOENT.
	317	*/
1da177e4 LT	318	int
	319	dasd_proc_init(void)
	320	{
c74c120a	321	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
7220fe8b HH	322	if (!dasd_proc_root_entry)
7220fe8b HH	323	goto out_nodasd;
8b594007 DL	324	dasd_devices_entry = proc_create("devices",
	325	S_IFREG \| S_IRUGO \| S_IWUSR,
	326	dasd_proc_root_entry,
	327	&dasd_devices_file_ops);
7220fe8b HH	328	if (!dasd_devices_entry)
7220fe8b HH	329	goto out_nodevices;
1da177e4 LT	330	dasd_statistics_entry = create_proc_entry("statistics",
	331	S_IFREG \| S_IRUGO \| S_IWUSR,
	332	dasd_proc_root_entry);
7220fe8b HH	333	if (!dasd_statistics_entry)
7220fe8b HH	334	goto out_nostatistics;
1da177e4 LT	335	dasd_statistics_entry->read_proc = dasd_statistics_read;
1da177e4 LT	336	dasd_statistics_entry->write_proc = dasd_statistics_write;
1da177e4	337	return 0;
7220fe8b HH	338
	339	out_nostatistics:
	340	remove_proc_entry("devices", dasd_proc_root_entry);
	341	out_nodevices:
c74c120a	342	remove_proc_entry("dasd", NULL);
7220fe8b HH	343	out_nodasd:
7220fe8b HH	344	return -ENOENT;
1da177e4 LT	345	}
	346
	347	void
	348	dasd_proc_exit(void)
	349	{
	350	remove_proc_entry("devices", dasd_proc_root_entry);
	351	remove_proc_entry("statistics", dasd_proc_root_entry);
c74c120a	352	remove_proc_entry("dasd", NULL);
1da177e4	353	}