[deliverable/linux.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->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->state) {
	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	74	/* Print discipline string. */
294001a8	75	if (device->discipline != NULL)
1da177e4 LT	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);
1da177e4 LT	94	/* Print device status information. */
294001a8	95	switch (device->state) {
1da177e4 LT	96	case DASD_STATE_NEW:
	97	seq_printf(m, "new");
	98	break;
	99	case DASD_STATE_KNOWN:
	100	seq_printf(m, "detected");
	101	break;
	102	case DASD_STATE_BASIC:
	103	seq_printf(m, "basic");
	104	break;
90f0094d	105	case DASD_STATE_UNFMT:
b707dbe6	106	seq_printf(m, "unformatted");
90f0094d	107	break;
1da177e4 LT	108	case DASD_STATE_READY:
	109	case DASD_STATE_ONLINE:
	110	seq_printf(m, "active ");
8e09f215	111	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	112	seq_printf(m, "n/f ");
	113	else
	114	seq_printf(m,
b44b0ab3	115	"at blocksize: %d, %lld blocks, %lld MB",
8e09f215 SW	116	block->bp_block, block->blocks,
	117	((block->bp_block >> 9) *
	118	block->blocks) >> 11);
1da177e4 LT	119	break;
	120	default:
	121	seq_printf(m, "no stat");
	122	break;
	123	}
	124	dasd_put_device(device);
	125	if (dasd_probeonly)
	126	seq_printf(m, "(probeonly)");
	127	seq_printf(m, "\n");
	128	return 0;
	129	}
	130
	131	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	132	{
	133	if (*pos >= dasd_max_devindex)
	134	return NULL;
	135	return (void )((unsigned long) pos + 1);
	136	}
	137
	138	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	139	{
	140	++*pos;
	141	return dasd_devices_start(m, pos);
	142	}
	143
	144	static void dasd_devices_stop(struct seq_file m, void v)
	145	{
	146	}
	147
5c81cdbe	148	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	149	.start = dasd_devices_start,
	150	.next = dasd_devices_next,
	151	.stop = dasd_devices_stop,
	152	.show = dasd_devices_show,
	153	};
	154
	155	static int dasd_devices_open(struct inode inode, struct file file)
	156	{
	157	return seq_open(file, &dasd_devices_seq_ops);
	158	}
	159
d54b1fdb	160	static const struct file_operations dasd_devices_file_ops = {
8b594007	161	.owner = THIS_MODULE,
1da177e4 LT	162	.open = dasd_devices_open,
	163	.read = seq_read,
	164	.llseek = seq_lseek,
	165	.release = seq_release,
	166	};
	167
4d284cac	168	static int
1da177e4 LT	169	dasd_calc_metrics(char page, char *start, off_t off,
	170	int count, int *eof, int len)
	171	{
	172	len = (len > off) ? len - off : 0;
	173	if (len > count)
	174	len = count;
	175	if (len < count)
	176	*eof = 1;
	177	*start = page + off;
	178	return len;
	179	}
	180
3d62149f	181	#ifdef CONFIG_DASD_PROFILE
4d284cac	182	static char *
2bf373b3	183	dasd_statistics_array(char str, unsigned int array, int factor)
1da177e4 LT	184	{
	185	int i;
	186
	187	for (i = 0; i < 32; i++) {
2bf373b3	188	str += sprintf(str, "%7d ", array[i] / factor);
1da177e4 LT	189	if (i == 15)
	190	str += sprintf(str, "\n");
	191	}
	192	str += sprintf(str,"\n");
	193	return str;
	194	}
3d62149f	195	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	196
	197	static int
	198	dasd_statistics_read(char page, char *start, off_t off,
	199	int count, int eof, void data)
	200	{
	201	unsigned long len;
	202	#ifdef CONFIG_DASD_PROFILE
	203	struct dasd_profile_info_t *prof;
	204	char *str;
2bf373b3	205	int factor;
1da177e4 LT	206
	207	/* check for active profiling */
	208	if (dasd_profile_level == DASD_PROFILE_OFF) {
	209	len = sprintf(page, "Statistics are off - they might be "
	210	"switched on using 'echo set on > "
	211	"/proc/dasd/statistics'\n");
	212	return dasd_calc_metrics(page, start, off, count, eof, len);
	213	}
	214
	215	prof = &dasd_global_profile;
fbfecd37	216	/* prevent counter 'overflow' on output */
2bf373b3 SH	217	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
2bf373b3 SH	218	factor *= 10);
1da177e4 LT	219
	220	str = page;
	221	str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
2bf373b3	222	str += sprintf(str, "with %u sectors(512B each)\n",
1da177e4	223	prof->dasd_io_sects);
2bf373b3	224	str += sprintf(str, "Scale Factor is %d\n", factor);
1da177e4 LT	225	str += sprintf(str,
	226	" __<4 ___8 __16 __32 __64 _128 "
	227	" _256 _512 __1k __2k __4k __8k "
	228	" _16k _32k _64k 128k\n");
	229	str += sprintf(str,
	230	" _256 _512 __1M __2M __4M __8M "
	231	" _16M _32M _64M 128M 256M 512M "
	232	" __1G __2G __4G " " _>4G\n");
	233
	234	str += sprintf(str, "Histogram of sizes (512B secs)\n");
2bf373b3	235	str = dasd_statistics_array(str, prof->dasd_io_secs, factor);
1da177e4	236	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
2bf373b3	237	str = dasd_statistics_array(str, prof->dasd_io_times, factor);
1da177e4	238	str += sprintf(str, "Histogram of I/O times per sector\n");
2bf373b3	239	str = dasd_statistics_array(str, prof->dasd_io_timps, factor);
1da177e4	240	str += sprintf(str, "Histogram of I/O time till ssch\n");
2bf373b3	241	str = dasd_statistics_array(str, prof->dasd_io_time1, factor);
1da177e4	242	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
2bf373b3	243	str = dasd_statistics_array(str, prof->dasd_io_time2, factor);
1da177e4 LT	244	str += sprintf(str, "Histogram of I/O time between ssch "
1da177e4 LT	245	"and irq per sector\n");
2bf373b3	246	str = dasd_statistics_array(str, prof->dasd_io_time2ps, factor);
1da177e4	247	str += sprintf(str, "Histogram of I/O time between irq and end\n");
2bf373b3	248	str = dasd_statistics_array(str, prof->dasd_io_time3, factor);
1da177e4	249	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
2bf373b3	250	str = dasd_statistics_array(str, prof->dasd_io_nr_req, factor);
1da177e4 LT	251	len = str - page;
	252	#else
	253	len = sprintf(page, "Statistics are not activated in this kernel\n");
	254	#endif
	255	return dasd_calc_metrics(page, start, off, count, eof, len);
	256	}
	257
	258	static int
	259	dasd_statistics_write(struct file file, const char __user user_buf,
	260	unsigned long user_len, void *data)
	261	{
	262	#ifdef CONFIG_DASD_PROFILE
	263	char buffer, str;
	264
	265	if (user_len > 65536)
	266	user_len = 65536;
	267	buffer = dasd_get_user_string(user_buf, user_len);
	268	if (IS_ERR(buffer))
	269	return PTR_ERR(buffer);
fc19f381	270	DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
1da177e4 LT	271
1da177e4 LT	272	/* check for valid verbs */
e7d2860b	273	str = skip_spaces(buffer);
1da177e4 LT	274	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
1da177e4 LT	275	/* 'set xxx' was given */
e7d2860b	276	str = skip_spaces(str + 4);
1da177e4 LT	277	if (strcmp(str, "on") == 0) {
	278	/* switch on statistics profiling */
	279	dasd_profile_level = DASD_PROFILE_ON;
fc19f381 SH	280	pr_info("The statistics feature has been switched "
fc19f381 SH	281	"on\n");
1da177e4 LT	282	} else if (strcmp(str, "off") == 0) {
	283	/* switch off and reset statistics profiling */
	284	memset(&dasd_global_profile,
	285	0, sizeof (struct dasd_profile_info_t));
	286	dasd_profile_level = DASD_PROFILE_OFF;
fc19f381 SH	287	pr_info("The statistics feature has been switched "
fc19f381 SH	288	"off\n");
1da177e4 LT	289	} else
	290	goto out_error;
	291	} else if (strncmp(str, "reset", 5) == 0) {
	292	/* reset the statistics */
	293	memset(&dasd_global_profile, 0,
	294	sizeof (struct dasd_profile_info_t));
fc19f381	295	pr_info("The statistics have been reset\n");
1da177e4 LT	296	} else
	297	goto out_error;
	298	kfree(buffer);
	299	return user_len;
	300	out_error:
fc19f381 SH	301	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
fc19f381 SH	302	str);
1da177e4 LT	303	kfree(buffer);
	304	return -EINVAL;
	305	#else
fc19f381	306	pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
1da177e4 LT	307	return user_len;
	308	#endif /* CONFIG_DASD_PROFILE */
	309	}
	310
7220fe8b HH	311	/*
	312	* Create dasd proc-fs entries.
	313	* In case creation failed, cleanup and return -ENOENT.
	314	*/
1da177e4 LT	315	int
	316	dasd_proc_init(void)
	317	{
c74c120a	318	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
7220fe8b HH	319	if (!dasd_proc_root_entry)
7220fe8b HH	320	goto out_nodasd;
8b594007 DL	321	dasd_devices_entry = proc_create("devices",
	322	S_IFREG \| S_IRUGO \| S_IWUSR,
	323	dasd_proc_root_entry,
	324	&dasd_devices_file_ops);
7220fe8b HH	325	if (!dasd_devices_entry)
7220fe8b HH	326	goto out_nodevices;
1da177e4 LT	327	dasd_statistics_entry = create_proc_entry("statistics",
	328	S_IFREG \| S_IRUGO \| S_IWUSR,
	329	dasd_proc_root_entry);
7220fe8b HH	330	if (!dasd_statistics_entry)
7220fe8b HH	331	goto out_nostatistics;
1da177e4 LT	332	dasd_statistics_entry->read_proc = dasd_statistics_read;
1da177e4 LT	333	dasd_statistics_entry->write_proc = dasd_statistics_write;
1da177e4	334	return 0;
7220fe8b HH	335
	336	out_nostatistics:
	337	remove_proc_entry("devices", dasd_proc_root_entry);
	338	out_nodevices:
c74c120a	339	remove_proc_entry("dasd", NULL);
7220fe8b HH	340	out_nodasd:
7220fe8b HH	341	return -ENOENT;
1da177e4 LT	342	}
	343
	344	void
	345	dasd_proc_exit(void)
	346	{
	347	remove_proc_entry("devices", dasd_proc_root_entry);
	348	remove_proc_entry("statistics", dasd_proc_root_entry);
c74c120a	349	remove_proc_entry("dasd", NULL);
1da177e4	350	}