[mirror_ubuntu-bionic-kernel.git] / drivers / s390 / cio / blacklist.c

/*
 *  drivers/s390/cio/blacklist.c
 *   S/390 common I/O routines -- blacklisting of specific devices
 *
 *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
 *			      IBM Corporation
 *    Author(s): Ingo Adlung (adlung@de.ibm.com)
 *		 Cornelia Huck (cornelia.huck@de.ibm.com)
 *		 Arnd Bergmann (arndb@de.ibm.com)
 */

#define KMSG_COMPONENT "cio"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/ctype.h>
#include <linux/device.h>

#include <asm/cio.h>
#include <asm/uaccess.h>

#include "blacklist.h"
#include "cio.h"
#include "cio_debug.h"
#include "css.h"
#include "device.h"

/*
 * "Blacklisting" of certain devices:
 * Device numbers given in the commandline as cio_ignore=... won't be known
 * to Linux.
 *
 * These can be single devices or ranges of devices
 */

/* 65536 bits for each set to indicate if a devno is blacklisted or not */
#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
			 (8*sizeof(long)))
static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
typedef enum {add, free} range_action;

/*
 * Function: blacklist_range
 * (Un-)blacklist the devices from-to
 */
static int blacklist_range(range_action action, unsigned int from_ssid,
			   unsigned int to_ssid, unsigned int from,
			   unsigned int to, int msgtrigger)
{
	if ((from_ssid > to_ssid) || ((from_ssid == to_ssid) && (from > to))) {
		if (msgtrigger)
			pr_warning("0.%x.%04x to 0.%x.%04x is not a valid "
				   "range for cio_ignore\n", from_ssid, from,
				   to_ssid, to);

		return 1;
	}

	while ((from_ssid < to_ssid) || ((from_ssid == to_ssid) &&
	       (from <= to))) {
		if (action == add)
			set_bit(from, bl_dev[from_ssid]);
		else
			clear_bit(from, bl_dev[from_ssid]);
		from++;
		if (from > __MAX_SUBCHANNEL) {
			from_ssid++;
			from = 0;
		}
	}

	return 0;
}

static int pure_hex(char **cp, unsigned int *val, int min_digit,
		    int max_digit, int max_val)
{
	int diff;
	unsigned int value;

	diff = 0;
	*val = 0;

	while (isxdigit(**cp) && (diff <= max_digit)) {

		if (isdigit(**cp))
			value = **cp - '0';
		else
			value = tolower(**cp) - 'a' + 10;
		*val = *val * 16 + value;
		(*cp)++;
		diff++;
	}

	if ((diff < min_digit) || (diff > max_digit) || (*val > max_val))
		return 1;

	return 0;
}

static int parse_busid(char *str, unsigned int *cssid, unsigned int *ssid,
		       unsigned int *devno, int msgtrigger)
{
	char *str_work;
	int val, rc, ret;

	rc = 1;

	if (*str == '\0')
		goto out;

	/* old style */
	str_work = str;
	val = simple_strtoul(str, &str_work, 16);

	if (*str_work == '\0') {
		if (val <= __MAX_SUBCHANNEL) {
			*devno = val;
			*ssid = 0;
			*cssid = 0;
			rc = 0;
		}
		goto out;
	}

	/* new style */
	str_work = str;
	ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
	if (ret || (str_work[0] != '.'))
		goto out;
	str_work++;
	ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
	if (ret || (str_work[0] != '.'))
		goto out;
	str_work++;
	ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
	if (ret || (str_work[0] != '\0'))
		goto out;

	rc = 0;
out:
	if (rc && msgtrigger)
		pr_warning("%s is not a valid device for the cio_ignore "
			   "kernel parameter\n", str);

	return rc;
}

static int blacklist_parse_parameters(char *str, range_action action,
				      int msgtrigger)
{
	unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
	int rc, totalrc;
	char *parm;
	range_action ra;

	totalrc = 0;

	while ((parm = strsep(&str, ","))) {
		rc = 0;
		ra = action;
		if (*parm == '!') {
			if (ra == add)
				ra = free;
			else
				ra = add;
			parm++;
		}
		if (strcmp(parm, "all") == 0) {
			from_cssid = 0;
			from_ssid = 0;
			from = 0;
			to_cssid = __MAX_CSSID;
			to_ssid = __MAX_SSID;
			to = __MAX_SUBCHANNEL;
		} else {
			rc = parse_busid(strsep(&parm, "-"), &from_cssid,
					 &from_ssid, &from, msgtrigger);
			if (!rc) {
				if (parm != NULL)
					rc = parse_busid(parm, &to_cssid,
							 &to_ssid, &to,
							 msgtrigger);
				else {
					to_cssid = from_cssid;
					to_ssid = from_ssid;
					to = from;
				}
			}
		}
		if (!rc) {
			rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
					     msgtrigger);
			if (rc)
				totalrc = -EINVAL;
		} else
			totalrc = -EINVAL;
	}

	return totalrc;
}

static int __init
blacklist_setup (char *str)
{
	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	if (blacklist_parse_parameters(str, add, 1))
		return 0;
	return 1;
}

__setup ("cio_ignore=", blacklist_setup);

/* Checking if devices are blacklisted */

/*
 * Function: is_blacklisted
 * Returns 1 if the given devicenumber can be found in the blacklist,
 * otherwise 0.
 * Used by validate_subchannel()
 */
int
is_blacklisted (int ssid, int devno)
{
	return test_bit (devno, bl_dev[ssid]);
}

#ifdef CONFIG_PROC_FS
/*
 * Function: blacklist_parse_proc_parameters
 * parse the stuff which is piped to /proc/cio_ignore
 */
static int blacklist_parse_proc_parameters(char *buf)
{
	int rc;
	char *parm;

	parm = strsep(&buf, " ");

	if (strcmp("free", parm) == 0)
		rc = blacklist_parse_parameters(buf, free, 0);
	else if (strcmp("add", parm) == 0)
		rc = blacklist_parse_parameters(buf, add, 0);
	else if (strcmp("purge", parm) == 0)
		return ccw_purge_blacklisted();
	else
		return -EINVAL;

	css_schedule_reprobe();

	return rc;
}

/* Iterator struct for all devices. */
struct ccwdev_iter {
	int devno;
	int ssid;
	int in_range;
};

static void *
cio_ignore_proc_seq_start(struct seq_file *s, loff_t *offset)
{
	struct ccwdev_iter *iter = s->private;

	if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
		return NULL;
	memset(iter, 0, sizeof(*iter));
	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
	return iter;
}

static void
cio_ignore_proc_seq_stop(struct seq_file *s, void *it)
{
}

static void *
cio_ignore_proc_seq_next(struct seq_file *s, void *it, loff_t *offset)
{
	struct ccwdev_iter *iter;

	if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
		return NULL;
	iter = it;
	if (iter->devno == __MAX_SUBCHANNEL) {
		iter->devno = 0;
		iter->ssid++;
		if (iter->ssid > __MAX_SSID)
			return NULL;
	} else
		iter->devno++;
	(*offset)++;
	return iter;
}

static int
cio_ignore_proc_seq_show(struct seq_file *s, void *it)
{
	struct ccwdev_iter *iter;

	iter = it;
	if (!is_blacklisted(iter->ssid, iter->devno))
		/* Not blacklisted, nothing to output. */
		return 0;
	if (!iter->in_range) {
		/* First device in range. */
		if ((iter->devno == __MAX_SUBCHANNEL) ||
		    !is_blacklisted(iter->ssid, iter->devno + 1))
			/* Singular device. */
			return seq_printf(s, "0.%x.%04x\n",
					  iter->ssid, iter->devno);
		iter->in_range = 1;
		return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
	}
	if ((iter->devno == __MAX_SUBCHANNEL) ||
	    !is_blacklisted(iter->ssid, iter->devno + 1)) {
		/* Last device in range. */
		iter->in_range = 0;
		return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
	}
	return 0;
}

static ssize_t
cio_ignore_write(struct file *file, const char __user *user_buf,
		 size_t user_len, loff_t *offset)
{
	char *buf;
	ssize_t rc, ret, i;

	if (*offset)
		return -EINVAL;
	if (user_len > 65536)
		user_len = 65536;
	buf = vmalloc (user_len + 1); /* maybe better use the stack? */
	if (buf == NULL)
		return -ENOMEM;
	memset(buf, 0, user_len + 1);

	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
		rc = -EFAULT;
		goto out_free;
	}

	i = user_len - 1;
	while ((i >= 0) && (isspace(buf[i]) || (buf[i] == 0))) {
		buf[i] = '\0';
		i--;
	}
	ret = blacklist_parse_proc_parameters(buf);
	if (ret)
		rc = ret;
	else
		rc = user_len;

out_free:
	vfree (buf);
	return rc;
}

static const struct seq_operations cio_ignore_proc_seq_ops = {
	.start = cio_ignore_proc_seq_start,
	.stop  = cio_ignore_proc_seq_stop,
	.next  = cio_ignore_proc_seq_next,
	.show  = cio_ignore_proc_seq_show,
};

static int
cio_ignore_proc_open(struct inode *inode, struct file *file)
{
	return seq_open_private(file, &cio_ignore_proc_seq_ops,
				sizeof(struct ccwdev_iter));
}

static const struct file_operations cio_ignore_proc_fops = {
	.open    = cio_ignore_proc_open,
	.read    = seq_read,
	.llseek  = seq_lseek,
	.release = seq_release_private,
	.write   = cio_ignore_write,
};

static int
cio_ignore_proc_init (void)
{
	struct proc_dir_entry *entry;

	entry = proc_create("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR, NULL,
			    &cio_ignore_proc_fops);
	if (!entry)
		return -ENOENT;
	return 0;
}

__initcall (cio_ignore_proc_init);

#endif /* CONFIG_PROC_FS */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* drivers/s390/cio/blacklist.c
	3	* S/390 common I/O routines -- blacklisting of specific devices
1da177e4 LT	4	*
	5	* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
	6	* IBM Corporation
	7	* Author(s): Ingo Adlung (adlung@de.ibm.com)
4ce3b30c	8	* Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4 LT	9	* Arnd Bergmann (arndb@de.ibm.com)
	10	*/
	11
e6d5a428 ME	12	#define KMSG_COMPONENT "cio"
	13	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	14
1da177e4 LT	15	#include <linux/init.h>
1da177e4 LT	16	#include <linux/vmalloc.h>
1da177e4	17	#include <linux/proc_fs.h>
678a395b	18	#include <linux/seq_file.h>
1da177e4 LT	19	#include <linux/ctype.h>
	20	#include <linux/device.h>
	21
	22	#include <asm/cio.h>
	23	#include <asm/uaccess.h>
	24
	25	#include "blacklist.h"
	26	#include "cio.h"
	27	#include "cio_debug.h"
	28	#include "css.h"
ecf5d9ef	29	#include "device.h"
1da177e4 LT	30
	31	/*
	32	* "Blacklisting" of certain devices:
	33	* Device numbers given in the commandline as cio_ignore=... won't be known
	34	* to Linux.
	35	*
	36	* These can be single devices or ranges of devices
	37	*/
	38
fb6958a5	39	/* 65536 bits for each set to indicate if a devno is blacklisted or not */
a8237fc4	40	#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1da177e4	41	(8*sizeof(long)))
fb6958a5	42	static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
1da177e4 LT	43	typedef enum {add, free} range_action;
	44
	45	/*
	46	* Function: blacklist_range
	47	* (Un-)blacklist the devices from-to
	48	*/
5b890987 ME	49	static int blacklist_range(range_action action, unsigned int from_ssid,
	50	unsigned int to_ssid, unsigned int from,
	51	unsigned int to, int msgtrigger)
1da177e4	52	{
5b890987 ME	53	if ((from_ssid > to_ssid) \|\| ((from_ssid == to_ssid) && (from > to))) {
5b890987 ME	54	if (msgtrigger)
e6d5a428 ME	55	pr_warning("0.%x.%04x to 0.%x.%04x is not a valid "
	56	"range for cio_ignore\n", from_ssid, from,
	57	to_ssid, to);
	58
5b890987	59	return 1;
1da177e4	60	}
5b890987 ME	61
	62	while ((from_ssid < to_ssid) \|\| ((from_ssid == to_ssid) &&
	63	(from <= to))) {
1da177e4	64	if (action == add)
5b890987	65	set_bit(from, bl_dev[from_ssid]);
1da177e4	66	else
5b890987 ME	67	clear_bit(from, bl_dev[from_ssid]);
	68	from++;
	69	if (from > __MAX_SUBCHANNEL) {
	70	from_ssid++;
	71	from = 0;
	72	}
1da177e4	73	}
5b890987 ME	74
5b890987 ME	75	return 0;
1da177e4 LT	76	}
1da177e4 LT	77
5b890987 ME	78	static int pure_hex(char *cp, unsigned int val, int min_digit,
5b890987 ME	79	int max_digit, int max_val)
1da177e4	80	{
5b890987 ME	81	int diff;
5b890987 ME	82	unsigned int value;
1da177e4	83
5b890987 ME	84	diff = 0;
5b890987 ME	85	*val = 0;
1da177e4	86
5b890987 ME	87	while (isxdigit(**cp) && (diff <= max_digit)) {
	88
	89	if (isdigit(**cp))
	90	value = **cp - '0';
	91	else
	92	value = tolower(**cp) - 'a' + 10;
	93	val = val * 16 + value;
	94	(*cp)++;
	95	diff++;
1da177e4	96	}
5b890987 ME	97
	98	if ((diff < min_digit) \|\| (diff > max_digit) \|\| (*val > max_val))
	99	return 1;
	100
1da177e4	101	return 0;
1da177e4 LT	102	}
1da177e4 LT	103
12829126 CH	104	static int parse_busid(char str, unsigned int cssid, unsigned int *ssid,
12829126 CH	105	unsigned int *devno, int msgtrigger)
1da177e4	106	{
5b890987 ME	107	char *str_work;
	108	int val, rc, ret;
	109
	110	rc = 1;
	111
	112	if (*str == '\0')
	113	goto out;
	114
	115	/* old style */
	116	str_work = str;
	117	val = simple_strtoul(str, &str_work, 16);
	118
	119	if (*str_work == '\0') {
	120	if (val <= __MAX_SUBCHANNEL) {
	121	*devno = val;
	122	*ssid = 0;
	123	*cssid = 0;
	124	rc = 0;
1da177e4	125	}
5b890987 ME	126	goto out;
5b890987 ME	127	}
1da177e4	128
5b890987 ME	129	/* new style */
	130	str_work = str;
	131	ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
	132	if (ret \|\| (str_work[0] != '.'))
	133	goto out;
	134	str_work++;
	135	ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
	136	if (ret \|\| (str_work[0] != '.'))
	137	goto out;
	138	str_work++;
	139	ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
	140	if (ret \|\| (str_work[0] != '\0'))
	141	goto out;
	142
	143	rc = 0;
	144	out:
	145	if (rc && msgtrigger)
e6d5a428 ME	146	pr_warning("%s is not a valid device for the cio_ignore "
e6d5a428 ME	147	"kernel parameter\n", str);
5b890987 ME	148
	149	return rc;
	150	}
1da177e4	151
5b890987 ME	152	static int blacklist_parse_parameters(char *str, range_action action,
	153	int msgtrigger)
	154	{
12829126	155	unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
5b890987 ME	156	int rc, totalrc;
	157	char *parm;
	158	range_action ra;
	159
	160	totalrc = 0;
	161
	162	while ((parm = strsep(&str, ","))) {
	163	rc = 0;
	164	ra = action;
	165	if (*parm == '!') {
	166	if (ra == add)
	167	ra = free;
	168	else
	169	ra = add;
	170	parm++;
	171	}
	172	if (strcmp(parm, "all") == 0) {
	173	from_cssid = 0;
	174	from_ssid = 0;
	175	from = 0;
	176	to_cssid = __MAX_CSSID;
	177	to_ssid = __MAX_SSID;
	178	to = __MAX_SUBCHANNEL;
	179	} else {
	180	rc = parse_busid(strsep(&parm, "-"), &from_cssid,
	181	&from_ssid, &from, msgtrigger);
	182	if (!rc) {
	183	if (parm != NULL)
	184	rc = parse_busid(parm, &to_cssid,
	185	&to_ssid, &to,
	186	msgtrigger);
	187	else {
	188	to_cssid = from_cssid;
	189	to_ssid = from_ssid;
	190	to = from;
	191	}
1da177e4 LT	192	}
1da177e4 LT	193	}
5b890987 ME	194	if (!rc) {
	195	rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
	196	msgtrigger);
	197	if (rc)
ecf5d9ef	198	totalrc = -EINVAL;
5b890987	199	} else
ecf5d9ef	200	totalrc = -EINVAL;
1da177e4	201	}
5b890987 ME	202
5b890987 ME	203	return totalrc;
1da177e4 LT	204	}
1da177e4 LT	205
1da177e4 LT	206	static int __init
	207	blacklist_setup (char *str)
	208	{
5b890987 ME	209	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	210	if (blacklist_parse_parameters(str, add, 1))
	211	return 0;
	212	return 1;
1da177e4 LT	213	}
	214
	215	__setup ("cio_ignore=", blacklist_setup);
	216
	217	/* Checking if devices are blacklisted */
	218
	219	/*
	220	* Function: is_blacklisted
	221	* Returns 1 if the given devicenumber can be found in the blacklist,
	222	* otherwise 0.
	223	* Used by validate_subchannel()
	224	*/
	225	int
fb6958a5	226	is_blacklisted (int ssid, int devno)
1da177e4	227	{
fb6958a5	228	return test_bit (devno, bl_dev[ssid]);
1da177e4 LT	229	}
	230
	231	#ifdef CONFIG_PROC_FS
1da177e4 LT	232	/*
	233	* Function: blacklist_parse_proc_parameters
	234	* parse the stuff which is piped to /proc/cio_ignore
	235	*/
5b890987	236	static int blacklist_parse_proc_parameters(char *buf)
1da177e4	237	{
5b890987 ME	238	int rc;
	239	char *parm;
	240
	241	parm = strsep(&buf, " ");
	242
	243	if (strcmp("free", parm) == 0)
	244	rc = blacklist_parse_parameters(buf, free, 0);
	245	else if (strcmp("add", parm) == 0)
	246	rc = blacklist_parse_parameters(buf, add, 0);
ecf5d9ef PO	247	else if (strcmp("purge", parm) == 0)
ecf5d9ef PO	248	return ccw_purge_blacklisted();
5b890987	249	else
ecf5d9ef	250	return -EINVAL;
1da177e4	251
40154b82	252	css_schedule_reprobe();
5b890987 ME	253
5b890987 ME	254	return rc;
1da177e4 LT	255	}
1da177e4 LT	256
678a395b CH	257	/* Iterator struct for all devices. */
	258	struct ccwdev_iter {
	259	int devno;
fb6958a5	260	int ssid;
678a395b CH	261	int in_range;
	262	};
	263
	264	static void *
	265	cio_ignore_proc_seq_start(struct seq_file s, loff_t offset)
1da177e4	266	{
05d419b1	267	struct ccwdev_iter *iter = s->private;
678a395b	268
fb6958a5	269	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	270	return NULL;
05d419b1	271	memset(iter, 0, sizeof(*iter));
fb6958a5 CH	272	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
fb6958a5 CH	273	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
678a395b CH	274	return iter;
	275	}
	276
	277	static void
	278	cio_ignore_proc_seq_stop(struct seq_file s, void it)
	279	{
678a395b	280	}
1da177e4	281
678a395b CH	282	static void *
	283	cio_ignore_proc_seq_next(struct seq_file s, void it, loff_t *offset)
	284	{
	285	struct ccwdev_iter *iter;
	286
fb6958a5	287	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	288	return NULL;
3b793060	289	iter = it;
fb6958a5 CH	290	if (iter->devno == __MAX_SUBCHANNEL) {
	291	iter->devno = 0;
	292	iter->ssid++;
	293	if (iter->ssid > __MAX_SSID)
	294	return NULL;
	295	} else
	296	iter->devno++;
678a395b CH	297	(*offset)++;
678a395b CH	298	return iter;
1da177e4 LT	299	}
1da177e4 LT	300
678a395b CH	301	static int
	302	cio_ignore_proc_seq_show(struct seq_file s, void it)
	303	{
	304	struct ccwdev_iter *iter;
	305
3b793060	306	iter = it;
fb6958a5	307	if (!is_blacklisted(iter->ssid, iter->devno))
678a395b CH	308	/* Not blacklisted, nothing to output. */
	309	return 0;
	310	if (!iter->in_range) {
	311	/* First device in range. */
	312	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
fb6958a5	313	!is_blacklisted(iter->ssid, iter->devno + 1))
678a395b	314	/* Singular device. */
fb6958a5 CH	315	return seq_printf(s, "0.%x.%04x\n",
fb6958a5 CH	316	iter->ssid, iter->devno);
678a395b	317	iter->in_range = 1;
fb6958a5	318	return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
678a395b CH	319	}
678a395b CH	320	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
fb6958a5	321	!is_blacklisted(iter->ssid, iter->devno + 1)) {
678a395b CH	322	/* Last device in range. */
678a395b CH	323	iter->in_range = 0;
fb6958a5	324	return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
678a395b CH	325	}
	326	return 0;
	327	}
	328
	329	static ssize_t
	330	cio_ignore_write(struct file file, const char __user user_buf,
	331	size_t user_len, loff_t *offset)
1da177e4 LT	332	{
1da177e4 LT	333	char *buf;
94cbc203	334	ssize_t rc, ret, i;
1da177e4	335
678a395b CH	336	if (*offset)
678a395b CH	337	return -EINVAL;
1da177e4 LT	338	if (user_len > 65536)
	339	user_len = 65536;
	340	buf = vmalloc (user_len + 1); /* maybe better use the stack? */
	341	if (buf == NULL)
	342	return -ENOMEM;
5b890987 ME	343	memset(buf, 0, user_len + 1);
5b890987 ME	344
1da177e4	345	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
5b890987 ME	346	rc = -EFAULT;
5b890987 ME	347	goto out_free;
1da177e4	348	}
1da177e4	349
5b890987 ME	350	i = user_len - 1;
	351	while ((i >= 0) && (isspace(buf[i]) \|\| (buf[i] == 0))) {
	352	buf[i] = '\0';
	353	i--;
	354	}
	355	ret = blacklist_parse_proc_parameters(buf);
	356	if (ret)
ecf5d9ef	357	rc = ret;
5b890987 ME	358	else
5b890987 ME	359	rc = user_len;
1da177e4	360
5b890987	361	out_free:
1da177e4	362	vfree (buf);
5b890987	363	return rc;
1da177e4 LT	364	}
1da177e4 LT	365
5c81cdbe	366	static const struct seq_operations cio_ignore_proc_seq_ops = {
678a395b CH	367	.start = cio_ignore_proc_seq_start,
	368	.stop = cio_ignore_proc_seq_stop,
	369	.next = cio_ignore_proc_seq_next,
	370	.show = cio_ignore_proc_seq_show,
	371	};
	372
	373	static int
	374	cio_ignore_proc_open(struct inode inode, struct file file)
	375	{
05d419b1 CB	376	return seq_open_private(file, &cio_ignore_proc_seq_ops,
05d419b1 CB	377	sizeof(struct ccwdev_iter));
678a395b CH	378	}
678a395b CH	379
d54b1fdb	380	static const struct file_operations cio_ignore_proc_fops = {
678a395b CH	381	.open = cio_ignore_proc_open,
	382	.read = seq_read,
	383	.llseek = seq_lseek,
05d419b1	384	.release = seq_release_private,
678a395b CH	385	.write = cio_ignore_write,
	386	};
	387
1da177e4 LT	388	static int
	389	cio_ignore_proc_init (void)
	390	{
	391	struct proc_dir_entry *entry;
	392
8b594007 DL	393	entry = proc_create("cio_ignore", S_IFREG \| S_IRUGO \| S_IWUSR, NULL,
8b594007 DL	394	&cio_ignore_proc_fops);
1da177e4	395	if (!entry)
a7fbf6bb	396	return -ENOENT;
a7fbf6bb	397	return 0;
1da177e4 LT	398	}
	399
	400	__initcall (cio_ignore_proc_init);
	401
	402	#endif /* CONFIG_PROC_FS */