[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.
 *
 */

#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
		return 0;
	/* Print device number. */
	seq_printf(m, "%s", device->cdev->dev.bus_id);
	/* 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)",
			   block->gdp->major, block->gdp->first_minor);
	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, %ld blocks, %ld 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 = {
	.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 shift)
{
	int i;

	for (i = 0; i < 32; i++) {
		str += sprintf(str, "%7d ", array[i] >> shift);
		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 shift;

	/* 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 couter 'overflow' on output */
	for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);

	str = page;
	str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
	str += sprintf(str, "with %d sectors(512B each)\n",
		       prof->dasd_io_sects);
	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, shift);
	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
	str = dasd_statistics_array(str, prof->dasd_io_times, shift);
	str += sprintf(str, "Histogram of I/O times per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
	str += sprintf(str, "Histogram of I/O time till ssch\n");
	str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
	str += sprintf(str, "Histogram of I/O time between ssch "
			    "and irq per sector\n");
	str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
	str += sprintf(str, "Histogram of I/O time between irq and end\n");
	str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
	str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
	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);
	MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", 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;
			MESSAGE(KERN_INFO, "%s", "Statistics switched on");
		} 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;
			MESSAGE(KERN_INFO, "%s", "Statistics switched off");
		} 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));
		MESSAGE(KERN_INFO, "%s", "Statistics reset");
	} else
		goto out_error;
	kfree(buffer);
	return user_len;
out_error:
	MESSAGE(KERN_WARNING, "%s",
		"/proc/dasd/statistics: only 'set on', 'set off' "
		"and 'reset' are supported verbs");
	kfree(buffer);
	return -EINVAL;
#else
	MESSAGE(KERN_WARNING, "%s",
		"/proc/dasd/statistics: is not activated in this kernel");
	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", &proc_root);
	if (!dasd_proc_root_entry)
		goto out_nodasd;
	dasd_proc_root_entry->owner = THIS_MODULE;
	dasd_devices_entry = create_proc_entry("devices",
					       S_IFREG | S_IRUGO | S_IWUSR,
					       dasd_proc_root_entry);
	if (!dasd_devices_entry)
		goto out_nodevices;
	dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
	dasd_devices_entry->owner = THIS_MODULE;
	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;
	dasd_statistics_entry->owner = THIS_MODULE;
	return 0;

 out_nostatistics:
	remove_proc_entry("devices", dasd_proc_root_entry);
 out_nodevices:
	remove_proc_entry("dasd", &proc_root);
 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", &proc_root);
}
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
1da177e4 LT	14	#include <linux/ctype.h>
	15	#include <linux/seq_file.h>
	16	#include <linux/vmalloc.h>
66a464db	17	#include <linux/proc_fs.h>
1da177e4 LT	18
	19	#include <asm/debug.h>
	20	#include <asm/uaccess.h>
	21
	22	/* This is ugly... */
	23	#define PRINTK_HEADER "dasd_proc:"
	24
	25	#include "dasd_int.h"
	26
	27	static struct proc_dir_entry *dasd_proc_root_entry = NULL;
	28	static struct proc_dir_entry *dasd_devices_entry = NULL;
	29	static struct proc_dir_entry *dasd_statistics_entry = NULL;
	30
3d62149f	31	#ifdef CONFIG_DASD_PROFILE
4d284cac	32	static char *
1da177e4 LT	33	dasd_get_user_string(const char __user *user_buf, size_t user_len)
	34	{
	35	char *buffer;
	36
	37	buffer = kmalloc(user_len + 1, GFP_KERNEL);
	38	if (buffer == NULL)
	39	return ERR_PTR(-ENOMEM);
	40	if (copy_from_user(buffer, user_buf, user_len) != 0) {
	41	kfree(buffer);
	42	return ERR_PTR(-EFAULT);
	43	}
	44	/* got the string, now strip linefeed. */
	45	if (buffer[user_len - 1] == '\n')
	46	buffer[user_len - 1] = 0;
	47	else
	48	buffer[user_len] = 0;
	49	return buffer;
	50	}
3d62149f	51	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	52
	53	static int
	54	dasd_devices_show(struct seq_file m, void v)
	55	{
	56	struct dasd_device *device;
8e09f215	57	struct dasd_block *block;
1da177e4 LT	58	char *substr;
	59
	60	device = dasd_device_from_devindex((unsigned long) v - 1);
	61	if (IS_ERR(device))
	62	return 0;
8e09f215 SW	63	if (device->block)
	64	block = device->block;
	65	else
	66	return 0;
1da177e4 LT	67	/* Print device number. */
	68	seq_printf(m, "%s", device->cdev->dev.bus_id);
	69	/* Print discipline string. */
	70	if (device != NULL && device->discipline != NULL)
	71	seq_printf(m, "(%s)", device->discipline->name);
	72	else
	73	seq_printf(m, "(none)");
	74	/* Print kdev. */
8e09f215	75	if (block->gdp)
1da177e4	76	seq_printf(m, " at (%3d:%6d)",
8e09f215	77	block->gdp->major, block->gdp->first_minor);
1da177e4 LT	78	else
	79	seq_printf(m, " at (???:??????)");
	80	/* Print device name. */
8e09f215 SW	81	if (block->gdp)
8e09f215 SW	82	seq_printf(m, " is %-8s", block->gdp->disk_name);
1da177e4 LT	83	else
	84	seq_printf(m, " is ????????");
	85	/* Print devices features. */
c6eb7b77	86	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
1da177e4 LT	87	seq_printf(m, "%4s: ", substr);
	88	/* Print device status information. */
	89	switch ((device != NULL) ? device->state : -1) {
	90	case -1:
	91	seq_printf(m, "unknown");
	92	break;
	93	case DASD_STATE_NEW:
	94	seq_printf(m, "new");
	95	break;
	96	case DASD_STATE_KNOWN:
	97	seq_printf(m, "detected");
	98	break;
	99	case DASD_STATE_BASIC:
	100	seq_printf(m, "basic");
	101	break;
90f0094d	102	case DASD_STATE_UNFMT:
b707dbe6	103	seq_printf(m, "unformatted");
90f0094d	104	break;
1da177e4 LT	105	case DASD_STATE_READY:
	106	case DASD_STATE_ONLINE:
	107	seq_printf(m, "active ");
8e09f215	108	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	109	seq_printf(m, "n/f ");
	110	else
	111	seq_printf(m,
	112	"at blocksize: %d, %ld blocks, %ld MB",
8e09f215 SW	113	block->bp_block, block->blocks,
	114	((block->bp_block >> 9) *
	115	block->blocks) >> 11);
1da177e4 LT	116	break;
	117	default:
	118	seq_printf(m, "no stat");
	119	break;
	120	}
	121	dasd_put_device(device);
	122	if (dasd_probeonly)
	123	seq_printf(m, "(probeonly)");
	124	seq_printf(m, "\n");
	125	return 0;
	126	}
	127
	128	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	129	{
	130	if (*pos >= dasd_max_devindex)
	131	return NULL;
	132	return (void )((unsigned long) pos + 1);
	133	}
	134
	135	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	136	{
	137	++*pos;
	138	return dasd_devices_start(m, pos);
	139	}
	140
	141	static void dasd_devices_stop(struct seq_file m, void v)
	142	{
	143	}
	144
5c81cdbe	145	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	146	.start = dasd_devices_start,
	147	.next = dasd_devices_next,
	148	.stop = dasd_devices_stop,
	149	.show = dasd_devices_show,
	150	};
	151
	152	static int dasd_devices_open(struct inode inode, struct file file)
	153	{
	154	return seq_open(file, &dasd_devices_seq_ops);
	155	}
	156
d54b1fdb	157	static const struct file_operations dasd_devices_file_ops = {
1da177e4 LT	158	.open = dasd_devices_open,
	159	.read = seq_read,
	160	.llseek = seq_lseek,
	161	.release = seq_release,
	162	};
	163
4d284cac	164	static int
1da177e4 LT	165	dasd_calc_metrics(char page, char *start, off_t off,
	166	int count, int *eof, int len)
	167	{
	168	len = (len > off) ? len - off : 0;
	169	if (len > count)
	170	len = count;
	171	if (len < count)
	172	*eof = 1;
	173	*start = page + off;
	174	return len;
	175	}
	176
3d62149f	177	#ifdef CONFIG_DASD_PROFILE
4d284cac	178	static char *
2b67fc46	179	dasd_statistics_array(char str, unsigned int array, int shift)
1da177e4 LT	180	{
	181	int i;
	182
	183	for (i = 0; i < 32; i++) {
	184	str += sprintf(str, "%7d ", array[i] >> shift);
	185	if (i == 15)
	186	str += sprintf(str, "\n");
	187	}
	188	str += sprintf(str,"\n");
	189	return str;
	190	}
3d62149f	191	#endif /* CONFIG_DASD_PROFILE */
1da177e4 LT	192
	193	static int
	194	dasd_statistics_read(char page, char *start, off_t off,
	195	int count, int eof, void data)
	196	{
	197	unsigned long len;
	198	#ifdef CONFIG_DASD_PROFILE
	199	struct dasd_profile_info_t *prof;
	200	char *str;
	201	int shift;
	202
	203	/* check for active profiling */
	204	if (dasd_profile_level == DASD_PROFILE_OFF) {
	205	len = sprintf(page, "Statistics are off - they might be "
	206	"switched on using 'echo set on > "
	207	"/proc/dasd/statistics'\n");
	208	return dasd_calc_metrics(page, start, off, count, eof, len);
	209	}
	210
	211	prof = &dasd_global_profile;
	212	/* prevent couter 'overflow' on output */
	213	for (shift = 0; (prof->dasd_io_reqs >> shift) > 9999999; shift++);
	214
	215	str = page;
	216	str += sprintf(str, "%d dasd I/O requests\n", prof->dasd_io_reqs);
	217	str += sprintf(str, "with %d sectors(512B each)\n",
	218	prof->dasd_io_sects);
	219	str += sprintf(str,
	220	" __<4 ___8 __16 __32 __64 _128 "
	221	" _256 _512 __1k __2k __4k __8k "
	222	" _16k _32k _64k 128k\n");
	223	str += sprintf(str,
	224	" _256 _512 __1M __2M __4M __8M "
	225	" _16M _32M _64M 128M 256M 512M "
	226	" __1G __2G __4G " " _>4G\n");
	227
	228	str += sprintf(str, "Histogram of sizes (512B secs)\n");
	229	str = dasd_statistics_array(str, prof->dasd_io_secs, shift);
	230	str += sprintf(str, "Histogram of I/O times (microseconds)\n");
	231	str = dasd_statistics_array(str, prof->dasd_io_times, shift);
	232	str += sprintf(str, "Histogram of I/O times per sector\n");
	233	str = dasd_statistics_array(str, prof->dasd_io_timps, shift);
	234	str += sprintf(str, "Histogram of I/O time till ssch\n");
	235	str = dasd_statistics_array(str, prof->dasd_io_time1, shift);
	236	str += sprintf(str, "Histogram of I/O time between ssch and irq\n");
	237	str = dasd_statistics_array(str, prof->dasd_io_time2, shift);
	238	str += sprintf(str, "Histogram of I/O time between ssch "
	239	"and irq per sector\n");
	240	str = dasd_statistics_array(str, prof->dasd_io_time2ps, shift);
	241	str += sprintf(str, "Histogram of I/O time between irq and end\n");
	242	str = dasd_statistics_array(str, prof->dasd_io_time3, shift);
	243	str += sprintf(str, "# of req in chanq at enqueuing (1..32) \n");
	244	str = dasd_statistics_array(str, prof->dasd_io_nr_req, shift);
	245	len = str - page;
	246	#else
	247	len = sprintf(page, "Statistics are not activated in this kernel\n");
	248	#endif
	249	return dasd_calc_metrics(page, start, off, count, eof, len);
	250	}
	251
	252	static int
	253	dasd_statistics_write(struct file file, const char __user user_buf,
	254	unsigned long user_len, void *data)
	255	{
256	#ifdef CONFIG_DASD_PROFILE
257	char buffer, str;
258
259	if (user_len > 65536)
260	user_len = 65536;
261	buffer = dasd_get_user_string(user_buf, user_len);
262	if (IS_ERR(buffer))
263	return PTR_ERR(buffer);
264	MESSAGE_LOG(KERN_INFO, "/proc/dasd/statictics: '%s'", buffer);
265
266	/* check for valid verbs */
267	for (str = buffer; isspace(*str); str++);
268	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
269	/* 'set xxx' was given */
270	for (str = str + 4; isspace(*str); str++);
271	if (strcmp(str, "on") == 0) {
272	/* switch on statistics profiling */
273	dasd_profile_level = DASD_PROFILE_ON;
274	MESSAGE(KERN_INFO, "%s", "Statistics switched on");
275	} else if (strcmp(str, "off") == 0) {
276	/* switch off and reset statistics profiling */
277	memset(&dasd_global_profile,
278	0, sizeof (struct dasd_profile_info_t));
279	dasd_profile_level = DASD_PROFILE_OFF;
280	MESSAGE(KERN_INFO, "%s", "Statistics switched off");
281	} else
282	goto out_error;
283	} else if (strncmp(str, "reset", 5) == 0) {
284	/* reset the statistics */
285	memset(&dasd_global_profile, 0,
286	sizeof (struct dasd_profile_info_t));
287	MESSAGE(KERN_INFO, "%s", "Statistics reset");
288	} else
289	goto out_error;
290	kfree(buffer);
291	return user_len;
292	out_error:
293	MESSAGE(KERN_WARNING, "%s",
294	"/proc/dasd/statistics: only 'set on', 'set off' "
295	"and 'reset' are supported verbs");
296	kfree(buffer);
297	return -EINVAL;
298	#else
299	MESSAGE(KERN_WARNING, "%s",
300	"/proc/dasd/statistics: is not activated in this kernel");
301	return user_len;
302	#endif /* CONFIG_DASD_PROFILE */
303	}
304
7220fe8b HH	305	/*
	306	* Create dasd proc-fs entries.
	307	* In case creation failed, cleanup and return -ENOENT.
	308	*/
1da177e4 LT	309	int
	310	dasd_proc_init(void)
	311	{
	312	dasd_proc_root_entry = proc_mkdir("dasd", &proc_root);
7220fe8b HH	313	if (!dasd_proc_root_entry)
7220fe8b HH	314	goto out_nodasd;
1da177e4 LT	315	dasd_proc_root_entry->owner = THIS_MODULE;
	316	dasd_devices_entry = create_proc_entry("devices",
	317	S_IFREG \| S_IRUGO \| S_IWUSR,
	318	dasd_proc_root_entry);
7220fe8b HH	319	if (!dasd_devices_entry)
7220fe8b HH	320	goto out_nodevices;
1da177e4 LT	321	dasd_devices_entry->proc_fops = &dasd_devices_file_ops;
	322	dasd_devices_entry->owner = THIS_MODULE;
	323	dasd_statistics_entry = create_proc_entry("statistics",
	324	S_IFREG \| S_IRUGO \| S_IWUSR,
	325	dasd_proc_root_entry);
7220fe8b HH	326	if (!dasd_statistics_entry)
7220fe8b HH	327	goto out_nostatistics;
1da177e4 LT	328	dasd_statistics_entry->read_proc = dasd_statistics_read;
	329	dasd_statistics_entry->write_proc = dasd_statistics_write;
	330	dasd_statistics_entry->owner = THIS_MODULE;
	331	return 0;
7220fe8b HH	332
	333	out_nostatistics:
	334	remove_proc_entry("devices", dasd_proc_root_entry);
	335	out_nodevices:
	336	remove_proc_entry("dasd", &proc_root);
	337	out_nodasd:
	338	return -ENOENT;
1da177e4 LT	339	}
	340
	341	void
	342	dasd_proc_exit(void)
	343	{
	344	remove_proc_entry("devices", dasd_proc_root_entry);
	345	remove_proc_entry("statistics", dasd_proc_root_entry);
	346	remove_proc_entry("dasd", &proc_root);
	347	}