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

/*
 * File...........: linux/drivers/s390/block/dasd_proc.c
 * Author(s)......: Holger Smolinski <[email protected]>
 *		    Horst Hummel <[email protected]>
 *		    Carsten Otte <[email protected]>
 *		    Martin Schwidefsky <[email protected]>
 * Bugreports.to..: <[email protected]>
 * (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/slab.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,
};

#ifdef CONFIG_DASD_PROFILE
static void dasd_statistics_array(struct seq_file *m, unsigned int *array, int factor)
{
	int i;

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

static int dasd_stats_proc_show(struct seq_file *m, void *v)
{
#ifdef CONFIG_DASD_PROFILE
	struct dasd_profile_info_t *prof;
	int factor;

	/* check for active profiling */
	if (dasd_profile_level == DASD_PROFILE_OFF) {
		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;
	/* prevent counter 'overflow' on output */
	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
	     factor *= 10);

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

	seq_printf(m, "Histogram of sizes (512B secs)\n");
	dasd_statistics_array(m, prof->dasd_io_secs, factor);
	seq_printf(m, "Histogram of I/O times (microseconds)\n");
	dasd_statistics_array(m, prof->dasd_io_times, factor);
	seq_printf(m, "Histogram of I/O times per sector\n");
	dasd_statistics_array(m, prof->dasd_io_timps, factor);
	seq_printf(m, "Histogram of I/O time till ssch\n");
	dasd_statistics_array(m, prof->dasd_io_time1, factor);
	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
	dasd_statistics_array(m, prof->dasd_io_time2, factor);
	seq_printf(m, "Histogram of I/O time between ssch "
			    "and irq per sector\n");
	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
	seq_printf(m, "Histogram of I/O time between irq and end\n");
	dasd_statistics_array(m, prof->dasd_io_time3, factor);
	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
#else
	seq_printf(m, "Statistics are not activated in this kernel\n");
#endif
	return 0;
}

static int dasd_stats_proc_open(struct inode *inode, struct file *file)
{
	return single_open(file, dasd_stats_proc_show, NULL);
}

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;

	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 */
}

static const struct file_operations dasd_stats_proc_fops = {
	.owner		= THIS_MODULE,
	.open		= dasd_stats_proc_open,
	.read		= seq_read,
	.llseek		= seq_lseek,
	.release	= single_release,
	.write		= dasd_stats_proc_write,
};

/*
 * 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 = proc_create("statistics",
					    S_IFREG | S_IRUGO | S_IWUSR,
					    dasd_proc_root_entry,
					    &dasd_stats_proc_fops);
	if (!dasd_statistics_entry)
		goto out_nostatistics;
	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 <[email protected]>
	4	* Horst Hummel <[email protected]>
	5	* Carsten Otte <[email protected]>
	6	* Martin Schwidefsky <[email protected]>
	7	* Bugreports.to..: <[email protected]>
	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>
5a0e3ad6	17	#include <linux/slab.h>
e7d2860b	18	#include <linux/string.h>
1da177e4 LT	19	#include <linux/seq_file.h>
1da177e4 LT	20	#include <linux/vmalloc.h>
66a464db	21	#include <linux/proc_fs.h>
1da177e4 LT	22
	23	#include <asm/debug.h>
	24	#include <asm/uaccess.h>
	25
	26	/* This is ugly... */
	27	#define PRINTK_HEADER "dasd_proc:"
	28
	29	#include "dasd_int.h"
	30
	31	static struct proc_dir_entry *dasd_proc_root_entry = NULL;
	32	static struct proc_dir_entry *dasd_devices_entry = NULL;
	33	static struct proc_dir_entry *dasd_statistics_entry = NULL;
	34
3d62149f	35	#ifdef CONFIG_DASD_PROFILE
4d284cac	36	static char *
1da177e4 LT	37	dasd_get_user_string(const char __user *user_buf, size_t user_len)
	38	{
	39	char *buffer;
	40
	41	buffer = kmalloc(user_len + 1, GFP_KERNEL);
	42	if (buffer == NULL)
	43	return ERR_PTR(-ENOMEM);
	44	if (copy_from_user(buffer, user_buf, user_len) != 0) {
	45	kfree(buffer);
	46	return ERR_PTR(-EFAULT);
	47	}
	48	/* got the string, now strip linefeed. */
	49	if (buffer[user_len - 1] == '\n')
	50	buffer[user_len - 1] = 0;
	51	else
	52	buffer[user_len] = 0;
	53	return buffer;
	54	}
3d62149f	55	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	56
	57	static int
	58	dasd_devices_show(struct seq_file m, void v)
	59	{
	60	struct dasd_device *device;
8e09f215	61	struct dasd_block *block;
1da177e4 LT	62	char *substr;
	63
	64	device = dasd_device_from_devindex((unsigned long) v - 1);
	65	if (IS_ERR(device))
	66	return 0;
8e09f215 SW	67	if (device->block)
8e09f215 SW	68	block = device->block;
a5e23839 SW	69	else {
a5e23839 SW	70	dasd_put_device(device);
8e09f215	71	return 0;
a5e23839	72	}
1da177e4	73	/* Print device number. */
2a0217d5	74	seq_printf(m, "%s", dev_name(&device->cdev->dev));
1da177e4	75	/* Print discipline string. */
294001a8	76	if (device->discipline != NULL)
1da177e4 LT	77	seq_printf(m, "(%s)", device->discipline->name);
	78	else
	79	seq_printf(m, "(none)");
	80	/* Print kdev. */
8e09f215	81	if (block->gdp)
1da177e4	82	seq_printf(m, " at (%3d:%6d)",
f331c029 TH	83	MAJOR(disk_devt(block->gdp)),
f331c029 TH	84	MINOR(disk_devt(block->gdp)));
1da177e4 LT	85	else
	86	seq_printf(m, " at (???:??????)");
	87	/* Print device name. */
8e09f215 SW	88	if (block->gdp)
8e09f215 SW	89	seq_printf(m, " is %-8s", block->gdp->disk_name);
1da177e4 LT	90	else
	91	seq_printf(m, " is ????????");
	92	/* Print devices features. */
c6eb7b77	93	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
1da177e4 LT	94	seq_printf(m, "%4s: ", substr);
1da177e4 LT	95	/* Print device status information. */
294001a8	96	switch (device->state) {
1da177e4 LT	97	case DASD_STATE_NEW:
	98	seq_printf(m, "new");
	99	break;
	100	case DASD_STATE_KNOWN:
	101	seq_printf(m, "detected");
	102	break;
	103	case DASD_STATE_BASIC:
	104	seq_printf(m, "basic");
	105	break;
90f0094d	106	case DASD_STATE_UNFMT:
b707dbe6	107	seq_printf(m, "unformatted");
90f0094d	108	break;
1da177e4 LT	109	case DASD_STATE_READY:
	110	case DASD_STATE_ONLINE:
	111	seq_printf(m, "active ");
8e09f215	112	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	113	seq_printf(m, "n/f ");
	114	else
	115	seq_printf(m,
b44b0ab3	116	"at blocksize: %d, %lld blocks, %lld MB",
8e09f215 SW	117	block->bp_block, block->blocks,
	118	((block->bp_block >> 9) *
	119	block->blocks) >> 11);
1da177e4 LT	120	break;
	121	default:
	122	seq_printf(m, "no stat");
	123	break;
	124	}
	125	dasd_put_device(device);
	126	if (dasd_probeonly)
	127	seq_printf(m, "(probeonly)");
	128	seq_printf(m, "\n");
	129	return 0;
	130	}
	131
	132	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	133	{
	134	if (*pos >= dasd_max_devindex)
	135	return NULL;
	136	return (void )((unsigned long) pos + 1);
	137	}
	138
	139	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	140	{
	141	++*pos;
	142	return dasd_devices_start(m, pos);
	143	}
	144
	145	static void dasd_devices_stop(struct seq_file m, void v)
	146	{
	147	}
	148
5c81cdbe	149	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	150	.start = dasd_devices_start,
	151	.next = dasd_devices_next,
	152	.stop = dasd_devices_stop,
	153	.show = dasd_devices_show,
	154	};
	155
	156	static int dasd_devices_open(struct inode inode, struct file file)
	157	{
	158	return seq_open(file, &dasd_devices_seq_ops);
	159	}
	160
d54b1fdb	161	static const struct file_operations dasd_devices_file_ops = {
8b594007	162	.owner = THIS_MODULE,
1da177e4 LT	163	.open = dasd_devices_open,
	164	.read = seq_read,
	165	.llseek = seq_lseek,
	166	.release = seq_release,
	167	};
	168
3d62149f	169	#ifdef CONFIG_DASD_PROFILE
34b9243a	170	static void dasd_statistics_array(struct seq_file m, unsigned int array, int factor)
1da177e4 LT	171	{
	172	int i;
	173
	174	for (i = 0; i < 32; i++) {
34b9243a	175	seq_printf(m, "%7d ", array[i] / factor);
1da177e4	176	if (i == 15)
34b9243a	177	seq_putc(m, '\n');
1da177e4	178	}
34b9243a	179	seq_putc(m, '\n');
1da177e4	180	}
3d62149f	181	#endif /* CONFIG_DASD_PROFILE */
1da177e4	182
34b9243a	183	static int dasd_stats_proc_show(struct seq_file m, void v)
1da177e4	184	{
1da177e4 LT	185	#ifdef CONFIG_DASD_PROFILE
1da177e4 LT	186	struct dasd_profile_info_t *prof;
2bf373b3	187	int factor;
1da177e4 LT	188
	189	/* check for active profiling */
	190	if (dasd_profile_level == DASD_PROFILE_OFF) {
34b9243a	191	seq_printf(m, "Statistics are off - they might be "
1da177e4 LT	192	"switched on using 'echo set on > "
1da177e4 LT	193	"/proc/dasd/statistics'\n");
34b9243a	194	return 0;
1da177e4 LT	195	}
	196
	197	prof = &dasd_global_profile;
fbfecd37	198	/* prevent counter 'overflow' on output */
2bf373b3 SH	199	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
2bf373b3 SH	200	factor *= 10);
1da177e4	201
34b9243a AD	202	seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
34b9243a AD	203	seq_printf(m, "with %u sectors(512B each)\n",
1da177e4	204	prof->dasd_io_sects);
34b9243a AD	205	seq_printf(m, "Scale Factor is %d\n", factor);
34b9243a AD	206	seq_printf(m,
1da177e4 LT	207	" __<4 ___8 __16 __32 __64 _128 "
	208	" _256 _512 __1k __2k __4k __8k "
	209	" _16k _32k _64k 128k\n");
34b9243a	210	seq_printf(m,
1da177e4 LT	211	" _256 _512 __1M __2M __4M __8M "
	212	" _16M _32M _64M 128M 256M 512M "
	213	" __1G __2G __4G " " _>4G\n");
	214
34b9243a AD	215	seq_printf(m, "Histogram of sizes (512B secs)\n");
	216	dasd_statistics_array(m, prof->dasd_io_secs, factor);
	217	seq_printf(m, "Histogram of I/O times (microseconds)\n");
	218	dasd_statistics_array(m, prof->dasd_io_times, factor);
	219	seq_printf(m, "Histogram of I/O times per sector\n");
	220	dasd_statistics_array(m, prof->dasd_io_timps, factor);
	221	seq_printf(m, "Histogram of I/O time till ssch\n");
	222	dasd_statistics_array(m, prof->dasd_io_time1, factor);
	223	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
	224	dasd_statistics_array(m, prof->dasd_io_time2, factor);
	225	seq_printf(m, "Histogram of I/O time between ssch "
1da177e4	226	"and irq per sector\n");
34b9243a AD	227	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
	228	seq_printf(m, "Histogram of I/O time between irq and end\n");
	229	dasd_statistics_array(m, prof->dasd_io_time3, factor);
	230	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
	231	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
1da177e4	232	#else
34b9243a	233	seq_printf(m, "Statistics are not activated in this kernel\n");
1da177e4	234	#endif
34b9243a	235	return 0;
1da177e4 LT	236	}
1da177e4 LT	237
34b9243a AD	238	static int dasd_stats_proc_open(struct inode inode, struct file file)
	239	{
	240	return single_open(file, dasd_stats_proc_show, NULL);
	241	}
	242
	243	static ssize_t dasd_stats_proc_write(struct file *file,
	244	const char __user user_buf, size_t user_len, loff_t pos)
1da177e4 LT	245	{
	246	#ifdef CONFIG_DASD_PROFILE
	247	char buffer, str;
	248
	249	if (user_len > 65536)
	250	user_len = 65536;
	251	buffer = dasd_get_user_string(user_buf, user_len);
	252	if (IS_ERR(buffer))
	253	return PTR_ERR(buffer);
fc19f381	254	DBF_EVENT(DBF_DEBUG, "/proc/dasd/statictics: '%s'\n", buffer);
1da177e4 LT	255
1da177e4 LT	256	/* check for valid verbs */
e7d2860b	257	str = skip_spaces(buffer);
1da177e4 LT	258	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
1da177e4 LT	259	/* 'set xxx' was given */
e7d2860b	260	str = skip_spaces(str + 4);
1da177e4 LT	261	if (strcmp(str, "on") == 0) {
	262	/* switch on statistics profiling */
	263	dasd_profile_level = DASD_PROFILE_ON;
fc19f381 SH	264	pr_info("The statistics feature has been switched "
fc19f381 SH	265	"on\n");
1da177e4 LT	266	} else if (strcmp(str, "off") == 0) {
	267	/* switch off and reset statistics profiling */
	268	memset(&dasd_global_profile,
	269	0, sizeof (struct dasd_profile_info_t));
	270	dasd_profile_level = DASD_PROFILE_OFF;
fc19f381 SH	271	pr_info("The statistics feature has been switched "
fc19f381 SH	272	"off\n");
1da177e4 LT	273	} else
	274	goto out_error;
	275	} else if (strncmp(str, "reset", 5) == 0) {
	276	/* reset the statistics */
	277	memset(&dasd_global_profile, 0,
	278	sizeof (struct dasd_profile_info_t));
fc19f381	279	pr_info("The statistics have been reset\n");
1da177e4 LT	280	} else
	281	goto out_error;
	282	kfree(buffer);
	283	return user_len;
	284	out_error:
fc19f381 SH	285	pr_warning("%s is not a supported value for /proc/dasd/statistics\n",
fc19f381 SH	286	str);
1da177e4 LT	287	kfree(buffer);
	288	return -EINVAL;
	289	#else
fc19f381	290	pr_warning("/proc/dasd/statistics: is not activated in this kernel\n");
1da177e4 LT	291	return user_len;
	292	#endif /* CONFIG_DASD_PROFILE */
	293	}
	294
34b9243a AD	295	static const struct file_operations dasd_stats_proc_fops = {
	296	.owner = THIS_MODULE,
	297	.open = dasd_stats_proc_open,
	298	.read = seq_read,
	299	.llseek = seq_lseek,
	300	.release = single_release,
	301	.write = dasd_stats_proc_write,
	302	};
	303
7220fe8b HH	304	/*
	305	* Create dasd proc-fs entries.
	306	* In case creation failed, cleanup and return -ENOENT.
	307	*/
1da177e4 LT	308	int
	309	dasd_proc_init(void)
	310	{
c74c120a	311	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
7220fe8b HH	312	if (!dasd_proc_root_entry)
7220fe8b HH	313	goto out_nodasd;
8b594007 DL	314	dasd_devices_entry = proc_create("devices",
	315	S_IFREG \| S_IRUGO \| S_IWUSR,
	316	dasd_proc_root_entry,
	317	&dasd_devices_file_ops);
7220fe8b HH	318	if (!dasd_devices_entry)
7220fe8b HH	319	goto out_nodevices;
34b9243a AD	320	dasd_statistics_entry = proc_create("statistics",
	321	S_IFREG \| S_IRUGO \| S_IWUSR,
	322	dasd_proc_root_entry,
	323	&dasd_stats_proc_fops);
7220fe8b HH	324	if (!dasd_statistics_entry)
7220fe8b HH	325	goto out_nostatistics;
1da177e4	326	return 0;
7220fe8b HH	327
	328	out_nostatistics:
	329	remove_proc_entry("devices", dasd_proc_root_entry);
	330	out_nodevices:
c74c120a	331	remove_proc_entry("dasd", NULL);
7220fe8b HH	332	out_nodasd:
7220fe8b HH	333	return -ENOENT;
1da177e4 LT	334	}
	335
	336	void
	337	dasd_proc_exit(void)
	338	{
	339	remove_proc_entry("devices", dasd_proc_root_entry);
	340	remove_proc_entry("statistics", dasd_proc_root_entry);
c74c120a	341	remove_proc_entry("dasd", NULL);
1da177e4	342	}