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