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

// SPDX-License-Identifier: GPL-2.0
/*
 * 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>
 * Copyright IBM Corp. 1999, 2002
 *
 * /proc interface for the dasd driver.
 *
 */

#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 <linux/uaccess.h>

#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;

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: %u, %lu blocks, %lu 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,
};

#ifdef CONFIG_DASD_PROFILE
static int dasd_stats_all_block_on(void)
{
	int i, rc;
	struct dasd_device *device;

	rc = 0;
	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			rc = dasd_profile_on(&device->block->profile);
		dasd_put_device(device);
		if (rc)
			return rc;
	}
	return 0;
}

static void dasd_stats_all_block_off(void)
{
	int i;
	struct dasd_device *device;

	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			dasd_profile_off(&device->block->profile);
		dasd_put_device(device);
	}
}

static void dasd_stats_all_block_reset(void)
{
	int i;
	struct dasd_device *device;

	for (i = 0; i < dasd_max_devindex; ++i) {
		device = dasd_device_from_devindex(i);
		if (IS_ERR(device))
			continue;
		if (device->block)
			dasd_profile_reset(&device->block->profile);
		dasd_put_device(device);
	}
}

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 *prof;
	int factor;

	spin_lock_bh(&dasd_global_profile.lock);
	prof = dasd_global_profile.data;
	if (!prof) {
		spin_unlock_bh(&dasd_global_profile.lock);
		seq_printf(m, "Statistics are off - they might be "
				    "switched on using 'echo set on > "
				    "/proc/dasd/statistics'\n");
		return 0;
	}

	/* 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);
	spin_unlock_bh(&dasd_global_profile.lock);
#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;
	int rc;

	if (user_len > 65536)
		user_len = 65536;
	buffer = dasd_get_user_string(user_buf, user_len);
	if (IS_ERR(buffer))
		return PTR_ERR(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 */
			rc = dasd_stats_all_block_on();
			if (rc) {
				dasd_stats_all_block_off();
				goto out_error;
			}
			rc = dasd_profile_on(&dasd_global_profile);
			if (rc) {
				dasd_stats_all_block_off();
				goto out_error;
			}
			dasd_profile_reset(&dasd_global_profile);
			dasd_global_profile_level = DASD_PROFILE_ON;
			pr_info("The statistics feature has been switched "
				"on\n");
		} else if (strcmp(str, "off") == 0) {
			/* switch off statistics profiling */
			dasd_global_profile_level = DASD_PROFILE_OFF;
			dasd_profile_off(&dasd_global_profile);
			dasd_stats_all_block_off();
			pr_info("The statistics feature has been switched "
				"off\n");
		} else
			goto out_parse_error;
	} else if (strncmp(str, "reset", 5) == 0) {
		/* reset the statistics */
		dasd_profile_reset(&dasd_global_profile);
		dasd_stats_all_block_reset();
		pr_info("The statistics have been reset\n");
	} else
		goto out_parse_error;
	vfree(buffer);
	return user_len;
out_parse_error:
	rc = -EINVAL;
	pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
out_error:
	vfree(buffer);
	return rc;
#else
	pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
	return user_len;
#endif				/* CONFIG_DASD_PROFILE */
}

static const struct proc_ops dasd_stats_proc_ops = {
	.proc_open	= dasd_stats_proc_open,
	.proc_read	= seq_read,
	.proc_lseek	= seq_lseek,
	.proc_release	= single_release,
	.proc_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_seq("devices", 0444,
					 dasd_proc_root_entry,
					 &dasd_devices_seq_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_ops);
	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
b2441318	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
1da177e4 LT	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>
daa400f5	8	* Copyright IBM Corp. 1999, 2002
1da177e4 LT	9	*
	10	* /proc interface for the dasd driver.
	11	*
1da177e4 LT	12	*/
1da177e4 LT	13
1da177e4	14	#include <linux/ctype.h>
5a0e3ad6	15	#include <linux/slab.h>
e7d2860b	16	#include <linux/string.h>
1da177e4 LT	17	#include <linux/seq_file.h>
1da177e4 LT	18	#include <linux/vmalloc.h>
66a464db	19	#include <linux/proc_fs.h>
1da177e4 LT	20
1da177e4 LT	21	#include <asm/debug.h>
7c0f6ba6	22	#include <linux/uaccess.h>
1da177e4	23
1da177e4 LT	24	#include "dasd_int.h"
	25
	26	static struct proc_dir_entry *dasd_proc_root_entry = NULL;
	27	static struct proc_dir_entry *dasd_devices_entry = NULL;
	28	static struct proc_dir_entry *dasd_statistics_entry = NULL;
	29
1da177e4 LT	30	static int
	31	dasd_devices_show(struct seq_file m, void v)
	32	{
	33	struct dasd_device *device;
8e09f215	34	struct dasd_block *block;
1da177e4 LT	35	char *substr;
	36
	37	device = dasd_device_from_devindex((unsigned long) v - 1);
	38	if (IS_ERR(device))
	39	return 0;
8e09f215 SW	40	if (device->block)
8e09f215 SW	41	block = device->block;
a5e23839 SW	42	else {
a5e23839 SW	43	dasd_put_device(device);
8e09f215	44	return 0;
a5e23839	45	}
1da177e4	46	/* Print device number. */
2a0217d5	47	seq_printf(m, "%s", dev_name(&device->cdev->dev));
1da177e4	48	/* Print discipline string. */
294001a8	49	if (device->discipline != NULL)
1da177e4 LT	50	seq_printf(m, "(%s)", device->discipline->name);
	51	else
	52	seq_printf(m, "(none)");
	53	/* Print kdev. */
8e09f215	54	if (block->gdp)
1da177e4	55	seq_printf(m, " at (%3d:%6d)",
f331c029 TH	56	MAJOR(disk_devt(block->gdp)),
f331c029 TH	57	MINOR(disk_devt(block->gdp)));
1da177e4 LT	58	else
	59	seq_printf(m, " at (???:??????)");
	60	/* Print device name. */
8e09f215 SW	61	if (block->gdp)
8e09f215 SW	62	seq_printf(m, " is %-8s", block->gdp->disk_name);
1da177e4 LT	63	else
	64	seq_printf(m, " is ????????");
	65	/* Print devices features. */
c6eb7b77	66	substr = (device->features & DASD_FEATURE_READONLY) ? "(ro)" : " ";
1da177e4 LT	67	seq_printf(m, "%4s: ", substr);
1da177e4 LT	68	/* Print device status information. */
294001a8	69	switch (device->state) {
1da177e4 LT	70	case DASD_STATE_NEW:
	71	seq_printf(m, "new");
	72	break;
	73	case DASD_STATE_KNOWN:
	74	seq_printf(m, "detected");
	75	break;
	76	case DASD_STATE_BASIC:
	77	seq_printf(m, "basic");
	78	break;
90f0094d	79	case DASD_STATE_UNFMT:
b707dbe6	80	seq_printf(m, "unformatted");
90f0094d	81	break;
1da177e4 LT	82	case DASD_STATE_READY:
	83	case DASD_STATE_ONLINE:
	84	seq_printf(m, "active ");
8e09f215	85	if (dasd_check_blocksize(block->bp_block))
1da177e4 LT	86	seq_printf(m, "n/f ");
	87	else
	88	seq_printf(m,
7bf76f01	89	"at blocksize: %u, %lu blocks, %lu MB",
8e09f215 SW	90	block->bp_block, block->blocks,
	91	((block->bp_block >> 9) *
	92	block->blocks) >> 11);
1da177e4 LT	93	break;
	94	default:
	95	seq_printf(m, "no stat");
	96	break;
	97	}
	98	dasd_put_device(device);
	99	if (dasd_probeonly)
	100	seq_printf(m, "(probeonly)");
	101	seq_printf(m, "\n");
	102	return 0;
	103	}
	104
	105	static void dasd_devices_start(struct seq_file m, loff_t *pos)
	106	{
	107	if (*pos >= dasd_max_devindex)
	108	return NULL;
	109	return (void )((unsigned long) pos + 1);
	110	}
	111
	112	static void dasd_devices_next(struct seq_file m, void v, loff_t pos)
	113	{
	114	++*pos;
	115	return dasd_devices_start(m, pos);
	116	}
	117
	118	static void dasd_devices_stop(struct seq_file m, void v)
	119	{
	120	}
	121
5c81cdbe	122	static const struct seq_operations dasd_devices_seq_ops = {
1da177e4 LT	123	.start = dasd_devices_start,
	124	.next = dasd_devices_next,
	125	.stop = dasd_devices_stop,
	126	.show = dasd_devices_show,
	127	};
	128
3d62149f	129	#ifdef CONFIG_DASD_PROFILE
4fa52aa7 SW	130	static int dasd_stats_all_block_on(void)
	131	{
	132	int i, rc;
	133	struct dasd_device *device;
	134
	135	rc = 0;
	136	for (i = 0; i < dasd_max_devindex; ++i) {
	137	device = dasd_device_from_devindex(i);
	138	if (IS_ERR(device))
	139	continue;
	140	if (device->block)
	141	rc = dasd_profile_on(&device->block->profile);
	142	dasd_put_device(device);
	143	if (rc)
	144	return rc;
	145	}
	146	return 0;
	147	}
	148
	149	static void dasd_stats_all_block_off(void)
	150	{
	151	int i;
	152	struct dasd_device *device;
	153
	154	for (i = 0; i < dasd_max_devindex; ++i) {
	155	device = dasd_device_from_devindex(i);
	156	if (IS_ERR(device))
	157	continue;
	158	if (device->block)
	159	dasd_profile_off(&device->block->profile);
	160	dasd_put_device(device);
	161	}
	162	}
	163
	164	static void dasd_stats_all_block_reset(void)
	165	{
	166	int i;
	167	struct dasd_device *device;
	168
	169	for (i = 0; i < dasd_max_devindex; ++i) {
	170	device = dasd_device_from_devindex(i);
	171	if (IS_ERR(device))
	172	continue;
	173	if (device->block)
	174	dasd_profile_reset(&device->block->profile);
	175	dasd_put_device(device);
	176	}
	177	}
	178
34b9243a	179	static void dasd_statistics_array(struct seq_file m, unsigned int array, int factor)
1da177e4 LT	180	{
	181	int i;
	182
	183	for (i = 0; i < 32; i++) {
34b9243a	184	seq_printf(m, "%7d ", array[i] / factor);
1da177e4	185	if (i == 15)
34b9243a	186	seq_putc(m, '\n');
1da177e4	187	}
34b9243a	188	seq_putc(m, '\n');
1da177e4	189	}
3d62149f	190	#endif /* CONFIG_DASD_PROFILE */
1da177e4	191
34b9243a	192	static int dasd_stats_proc_show(struct seq_file m, void v)
1da177e4	193	{
1da177e4	194	#ifdef CONFIG_DASD_PROFILE
4fa52aa7	195	struct dasd_profile_info *prof;
2bf373b3	196	int factor;
1da177e4	197
6765cc2a SO	198	spin_lock_bh(&dasd_global_profile.lock);
	199	prof = dasd_global_profile.data;
	200	if (!prof) {
	201	spin_unlock_bh(&dasd_global_profile.lock);
34b9243a	202	seq_printf(m, "Statistics are off - they might be "
1da177e4 LT	203	"switched on using 'echo set on > "
1da177e4 LT	204	"/proc/dasd/statistics'\n");
34b9243a	205	return 0;
1da177e4 LT	206	}
1da177e4 LT	207
fbfecd37	208	/* prevent counter 'overflow' on output */
2bf373b3 SH	209	for (factor = 1; (prof->dasd_io_reqs / factor) > 9999999;
2bf373b3 SH	210	factor *= 10);
1da177e4	211
34b9243a AD	212	seq_printf(m, "%d dasd I/O requests\n", prof->dasd_io_reqs);
34b9243a AD	213	seq_printf(m, "with %u sectors(512B each)\n",
1da177e4	214	prof->dasd_io_sects);
34b9243a AD	215	seq_printf(m, "Scale Factor is %d\n", factor);
34b9243a AD	216	seq_printf(m,
1da177e4 LT	217	" __<4 ___8 __16 __32 __64 _128 "
	218	" _256 _512 __1k __2k __4k __8k "
	219	" _16k _32k _64k 128k\n");
34b9243a	220	seq_printf(m,
1da177e4 LT	221	" _256 _512 __1M __2M __4M __8M "
	222	" _16M _32M _64M 128M 256M 512M "
	223	" __1G __2G __4G " " _>4G\n");
	224
34b9243a AD	225	seq_printf(m, "Histogram of sizes (512B secs)\n");
	226	dasd_statistics_array(m, prof->dasd_io_secs, factor);
	227	seq_printf(m, "Histogram of I/O times (microseconds)\n");
	228	dasd_statistics_array(m, prof->dasd_io_times, factor);
	229	seq_printf(m, "Histogram of I/O times per sector\n");
	230	dasd_statistics_array(m, prof->dasd_io_timps, factor);
	231	seq_printf(m, "Histogram of I/O time till ssch\n");
	232	dasd_statistics_array(m, prof->dasd_io_time1, factor);
	233	seq_printf(m, "Histogram of I/O time between ssch and irq\n");
	234	dasd_statistics_array(m, prof->dasd_io_time2, factor);
	235	seq_printf(m, "Histogram of I/O time between ssch "
1da177e4	236	"and irq per sector\n");
34b9243a AD	237	dasd_statistics_array(m, prof->dasd_io_time2ps, factor);
	238	seq_printf(m, "Histogram of I/O time between irq and end\n");
	239	dasd_statistics_array(m, prof->dasd_io_time3, factor);
	240	seq_printf(m, "# of req in chanq at enqueuing (1..32) \n");
	241	dasd_statistics_array(m, prof->dasd_io_nr_req, factor);
8ea55c95	242	spin_unlock_bh(&dasd_global_profile.lock);
1da177e4	243	#else
34b9243a	244	seq_printf(m, "Statistics are not activated in this kernel\n");
1da177e4	245	#endif
34b9243a	246	return 0;
1da177e4 LT	247	}
1da177e4 LT	248
34b9243a AD	249	static int dasd_stats_proc_open(struct inode inode, struct file file)
	250	{
	251	return single_open(file, dasd_stats_proc_show, NULL);
	252	}
	253
	254	static ssize_t dasd_stats_proc_write(struct file *file,
	255	const char __user user_buf, size_t user_len, loff_t pos)
1da177e4 LT	256	{
	257	#ifdef CONFIG_DASD_PROFILE
	258	char buffer, str;
4fa52aa7	259	int rc;
1da177e4 LT	260
	261	if (user_len > 65536)
	262	user_len = 65536;
	263	buffer = dasd_get_user_string(user_buf, user_len);
	264	if (IS_ERR(buffer))
	265	return PTR_ERR(buffer);
1da177e4 LT	266
1da177e4 LT	267	/* check for valid verbs */
e7d2860b	268	str = skip_spaces(buffer);
1da177e4 LT	269	if (strncmp(str, "set", 3) == 0 && isspace(str[3])) {
1da177e4 LT	270	/* 'set xxx' was given */
e7d2860b	271	str = skip_spaces(str + 4);
1da177e4 LT	272	if (strcmp(str, "on") == 0) {
1da177e4 LT	273	/* switch on statistics profiling */
4fa52aa7 SW	274	rc = dasd_stats_all_block_on();
	275	if (rc) {
	276	dasd_stats_all_block_off();
	277	goto out_error;
	278	}
6765cc2a SO	279	rc = dasd_profile_on(&dasd_global_profile);
	280	if (rc) {
	281	dasd_stats_all_block_off();
	282	goto out_error;
	283	}
	284	dasd_profile_reset(&dasd_global_profile);
4fa52aa7	285	dasd_global_profile_level = DASD_PROFILE_ON;
fc19f381 SH	286	pr_info("The statistics feature has been switched "
fc19f381 SH	287	"on\n");
1da177e4	288	} else if (strcmp(str, "off") == 0) {
6765cc2a	289	/* switch off statistics profiling */
4fa52aa7	290	dasd_global_profile_level = DASD_PROFILE_OFF;
6765cc2a	291	dasd_profile_off(&dasd_global_profile);
4fa52aa7	292	dasd_stats_all_block_off();
fc19f381 SH	293	pr_info("The statistics feature has been switched "
fc19f381 SH	294	"off\n");
1da177e4	295	} else
4fa52aa7	296	goto out_parse_error;
1da177e4 LT	297	} else if (strncmp(str, "reset", 5) == 0) {
1da177e4 LT	298	/* reset the statistics */
6765cc2a	299	dasd_profile_reset(&dasd_global_profile);
4fa52aa7	300	dasd_stats_all_block_reset();
fc19f381	301	pr_info("The statistics have been reset\n");
1da177e4	302	} else
4fa52aa7	303	goto out_parse_error;
e4258d55	304	vfree(buffer);
1da177e4	305	return user_len;
4fa52aa7 SW	306	out_parse_error:
4fa52aa7 SW	307	rc = -EINVAL;
baebc70a	308	pr_warn("%s is not a supported value for /proc/dasd/statistics\n", str);
4fa52aa7	309	out_error:
e4258d55	310	vfree(buffer);
4fa52aa7	311	return rc;
1da177e4	312	#else
baebc70a	313	pr_warn("/proc/dasd/statistics: is not activated in this kernel\n");
1da177e4 LT	314	return user_len;
	315	#endif /* CONFIG_DASD_PROFILE */
	316	}
	317
97a32539 AD	318	static const struct proc_ops dasd_stats_proc_ops = {
	319	.proc_open = dasd_stats_proc_open,
	320	.proc_read = seq_read,
	321	.proc_lseek = seq_lseek,
	322	.proc_release = single_release,
	323	.proc_write = dasd_stats_proc_write,
34b9243a AD	324	};
34b9243a AD	325
7220fe8b HH	326	/*
	327	* Create dasd proc-fs entries.
	328	* In case creation failed, cleanup and return -ENOENT.
	329	*/
1da177e4 LT	330	int
	331	dasd_proc_init(void)
	332	{
c74c120a	333	dasd_proc_root_entry = proc_mkdir("dasd", NULL);
7220fe8b HH	334	if (!dasd_proc_root_entry)
7220fe8b HH	335	goto out_nodasd;
87ccdcfa	336	dasd_devices_entry = proc_create_seq("devices", 0444,
8b594007	337	dasd_proc_root_entry,
fddda2b7	338	&dasd_devices_seq_ops);
7220fe8b HH	339	if (!dasd_devices_entry)
7220fe8b HH	340	goto out_nodevices;
34b9243a AD	341	dasd_statistics_entry = proc_create("statistics",
	342	S_IFREG \| S_IRUGO \| S_IWUSR,
	343	dasd_proc_root_entry,
97a32539	344	&dasd_stats_proc_ops);
7220fe8b HH	345	if (!dasd_statistics_entry)
7220fe8b HH	346	goto out_nostatistics;
1da177e4	347	return 0;
7220fe8b HH	348
	349	out_nostatistics:
	350	remove_proc_entry("devices", dasd_proc_root_entry);
	351	out_nodevices:
c74c120a	352	remove_proc_entry("dasd", NULL);
7220fe8b HH	353	out_nodasd:
7220fe8b HH	354	return -ENOENT;
1da177e4 LT	355	}
	356
	357	void
	358	dasd_proc_exit(void)
	359	{
	360	remove_proc_entry("devices", dasd_proc_root_entry);
	361	remove_proc_entry("statistics", dasd_proc_root_entry);
c74c120a	362	remove_proc_entry("dasd", NULL);
1da177e4	363	}