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

/*
 *   S/390 common I/O routines -- blacklisting of specific devices
 *
 *    Copyright IBM Corp. 1999, 2013
 *    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 <linux/uaccess.h>
#include <asm/cio.h>
#include <asm/ipl.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_warn("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;

	diff = 0;
	*val = 0;

	while (diff <= max_digit) {
		int value = hex_to_bin(**cp);

		if (value < 0)
			break;
		*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_warn("%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 if (strcmp(parm, "ipldev") == 0) {
			if (ipl_info.type == IPL_TYPE_CCW) {
				from_cssid = 0;
				from_ssid = ipl_info.data.ccw.dev_id.ssid;
				from = ipl_info.data.ccw.dev_id.devno;
			} else if (ipl_info.type == IPL_TYPE_FCP ||
				   ipl_info.type == IPL_TYPE_FCP_DUMP) {
				from_cssid = 0;
				from_ssid = ipl_info.data.fcp.dev_id.ssid;
				from = ipl_info.data.fcp.dev_id.devno;
			} else {
				continue;
			}
			to_cssid = from_cssid;
			to_ssid = from_ssid;
			to = from;
		} else if (strcmp(parm, "condev") == 0) {
			if (console_devno == -1)
				continue;

			from_cssid = to_cssid = 0;
			from_ssid = to_ssid = 0;
			from = to = console_devno;
		} 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);
		css_schedule_eval_all_unreg(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;


	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. */
			seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
			return 0;
		}
		iter->in_range = 1;
		seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
		return 0;
	}
	if ((iter->devno == __MAX_SUBCHANNEL) ||
	    !is_blacklisted(iter->ssid, iter->devno + 1)) {
		/* Last device in range. */
		iter->in_range = 0;
		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 = vzalloc(user_len + 1); /* maybe better use the stack? */
	if (buf == NULL)
		return -ENOMEM;

	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	1	/*
1da177e4	2	* S/390 common I/O routines -- blacklisting of specific devices
1da177e4	3	*
0e6c83d1	4	* Copyright IBM Corp. 1999, 2013
1da177e4	5	* Author(s): Ingo Adlung (adlung@de.ibm.com)
4ce3b30c	6	* Cornelia Huck (cornelia.huck@de.ibm.com)
1da177e4 LT	7	* Arnd Bergmann (arndb@de.ibm.com)
	8	*/
	9
e6d5a428 ME	10	#define KMSG_COMPONENT "cio"
	11	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
	12
1da177e4 LT	13	#include <linux/init.h>
1da177e4 LT	14	#include <linux/vmalloc.h>
1da177e4	15	#include <linux/proc_fs.h>
678a395b	16	#include <linux/seq_file.h>
1da177e4 LT	17	#include <linux/ctype.h>
	18	#include <linux/device.h>
	19
7c0f6ba6	20	#include <linux/uaccess.h>
0e6c83d1 SO	21	#include <asm/cio.h>
0e6c83d1 SO	22	#include <asm/ipl.h>
1da177e4 LT	23
	24	#include "blacklist.h"
	25	#include "cio.h"
	26	#include "cio_debug.h"
	27	#include "css.h"
ecf5d9ef	28	#include "device.h"
1da177e4 LT	29
	30	/*
	31	* "Blacklisting" of certain devices:
	32	* Device numbers given in the commandline as cio_ignore=... won't be known
	33	* to Linux.
	34	*
	35	* These can be single devices or ranges of devices
	36	*/
	37
fb6958a5	38	/* 65536 bits for each set to indicate if a devno is blacklisted or not */
a8237fc4	39	#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1da177e4	40	(8*sizeof(long)))
fb6958a5	41	static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
1da177e4 LT	42	typedef enum {add, free} range_action;
	43
	44	/*
	45	* Function: blacklist_range
	46	* (Un-)blacklist the devices from-to
	47	*/
5b890987 ME	48	static int blacklist_range(range_action action, unsigned int from_ssid,
	49	unsigned int to_ssid, unsigned int from,
	50	unsigned int to, int msgtrigger)
1da177e4	51	{
5b890987 ME	52	if ((from_ssid > to_ssid) \|\| ((from_ssid == to_ssid) && (from > to))) {
5b890987 ME	53	if (msgtrigger)
baebc70a JP	54	pr_warn("0.%x.%04x to 0.%x.%04x is not a valid range for cio_ignore\n",
baebc70a JP	55	from_ssid, from, to_ssid, to);
e6d5a428	56
5b890987	57	return 1;
1da177e4	58	}
5b890987 ME	59
	60	while ((from_ssid < to_ssid) \|\| ((from_ssid == to_ssid) &&
	61	(from <= to))) {
1da177e4	62	if (action == add)
5b890987	63	set_bit(from, bl_dev[from_ssid]);
1da177e4	64	else
5b890987 ME	65	clear_bit(from, bl_dev[from_ssid]);
	66	from++;
	67	if (from > __MAX_SUBCHANNEL) {
	68	from_ssid++;
	69	from = 0;
	70	}
1da177e4	71	}
5b890987 ME	72
5b890987 ME	73	return 0;
1da177e4 LT	74	}
1da177e4 LT	75
5b890987 ME	76	static int pure_hex(char *cp, unsigned int val, int min_digit,
5b890987 ME	77	int max_digit, int max_val)
1da177e4	78	{
5b890987	79	int diff;
1da177e4	80
5b890987 ME	81	diff = 0;
5b890987 ME	82	*val = 0;
1da177e4	83
f2777077 AS	84	while (diff <= max_digit) {
f2777077 AS	85	int value = hex_to_bin(**cp);
5b890987	86
f2777077 AS	87	if (value < 0)
f2777077 AS	88	break;
5b890987 ME	89	val = val * 16 + value;
	90	(*cp)++;
	91	diff++;
1da177e4	92	}
5b890987 ME	93
	94	if ((diff < min_digit) \|\| (diff > max_digit) \|\| (*val > max_val))
	95	return 1;
	96
1da177e4	97	return 0;
1da177e4 LT	98	}
1da177e4 LT	99
12829126 CH	100	static int parse_busid(char str, unsigned int cssid, unsigned int *ssid,
12829126 CH	101	unsigned int *devno, int msgtrigger)
1da177e4	102	{
5b890987 ME	103	char *str_work;
	104	int val, rc, ret;
	105
	106	rc = 1;
	107
	108	if (*str == '\0')
	109	goto out;
	110
	111	/* old style */
	112	str_work = str;
	113	val = simple_strtoul(str, &str_work, 16);
	114
	115	if (*str_work == '\0') {
	116	if (val <= __MAX_SUBCHANNEL) {
	117	*devno = val;
	118	*ssid = 0;
	119	*cssid = 0;
	120	rc = 0;
1da177e4	121	}
5b890987 ME	122	goto out;
5b890987 ME	123	}
1da177e4	124
5b890987 ME	125	/* new style */
	126	str_work = str;
	127	ret = pure_hex(&str_work, cssid, 1, 2, __MAX_CSSID);
	128	if (ret \|\| (str_work[0] != '.'))
	129	goto out;
	130	str_work++;
	131	ret = pure_hex(&str_work, ssid, 1, 1, __MAX_SSID);
	132	if (ret \|\| (str_work[0] != '.'))
	133	goto out;
	134	str_work++;
	135	ret = pure_hex(&str_work, devno, 4, 4, __MAX_SUBCHANNEL);
	136	if (ret \|\| (str_work[0] != '\0'))
	137	goto out;
	138
	139	rc = 0;
	140	out:
	141	if (rc && msgtrigger)
baebc70a JP	142	pr_warn("%s is not a valid device for the cio_ignore kernel parameter\n",
baebc70a JP	143	str);
5b890987 ME	144
	145	return rc;
	146	}
1da177e4	147
5b890987 ME	148	static int blacklist_parse_parameters(char *str, range_action action,
	149	int msgtrigger)
	150	{
12829126	151	unsigned int from_cssid, to_cssid, from_ssid, to_ssid, from, to;
5b890987 ME	152	int rc, totalrc;
	153	char *parm;
	154	range_action ra;
	155
	156	totalrc = 0;
	157
	158	while ((parm = strsep(&str, ","))) {
	159	rc = 0;
	160	ra = action;
	161	if (*parm == '!') {
	162	if (ra == add)
	163	ra = free;
	164	else
	165	ra = add;
	166	parm++;
	167	}
	168	if (strcmp(parm, "all") == 0) {
	169	from_cssid = 0;
	170	from_ssid = 0;
	171	from = 0;
	172	to_cssid = __MAX_CSSID;
	173	to_ssid = __MAX_SSID;
	174	to = __MAX_SUBCHANNEL;
0e6c83d1 SO	175	} else if (strcmp(parm, "ipldev") == 0) {
	176	if (ipl_info.type == IPL_TYPE_CCW) {
	177	from_cssid = 0;
	178	from_ssid = ipl_info.data.ccw.dev_id.ssid;
	179	from = ipl_info.data.ccw.dev_id.devno;
	180	} else if (ipl_info.type == IPL_TYPE_FCP \|\|
	181	ipl_info.type == IPL_TYPE_FCP_DUMP) {
	182	from_cssid = 0;
	183	from_ssid = ipl_info.data.fcp.dev_id.ssid;
	184	from = ipl_info.data.fcp.dev_id.devno;
	185	} else {
	186	continue;
	187	}
	188	to_cssid = from_cssid;
	189	to_ssid = from_ssid;
	190	to = from;
d1eb16e6 SO	191	} else if (strcmp(parm, "condev") == 0) {
	192	if (console_devno == -1)
	193	continue;
	194
	195	from_cssid = to_cssid = 0;
	196	from_ssid = to_ssid = 0;
	197	from = to = console_devno;
5b890987 ME	198	} else {
	199	rc = parse_busid(strsep(&parm, "-"), &from_cssid,
	200	&from_ssid, &from, msgtrigger);
	201	if (!rc) {
	202	if (parm != NULL)
	203	rc = parse_busid(parm, &to_cssid,
	204	&to_ssid, &to,
	205	msgtrigger);
	206	else {
	207	to_cssid = from_cssid;
	208	to_ssid = from_ssid;
	209	to = from;
	210	}
1da177e4 LT	211	}
1da177e4 LT	212	}
5b890987 ME	213	if (!rc) {
	214	rc = blacklist_range(ra, from_ssid, to_ssid, from, to,
	215	msgtrigger);
	216	if (rc)
ecf5d9ef	217	totalrc = -EINVAL;
5b890987	218	} else
ecf5d9ef	219	totalrc = -EINVAL;
1da177e4	220	}
5b890987 ME	221
5b890987 ME	222	return totalrc;
1da177e4 LT	223	}
1da177e4 LT	224
1da177e4 LT	225	static int __init
	226	blacklist_setup (char *str)
	227	{
5b890987 ME	228	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	229	if (blacklist_parse_parameters(str, add, 1))
	230	return 0;
	231	return 1;
1da177e4 LT	232	}
	233
	234	__setup ("cio_ignore=", blacklist_setup);
	235
	236	/* Checking if devices are blacklisted */
	237
	238	/*
	239	* Function: is_blacklisted
	240	* Returns 1 if the given devicenumber can be found in the blacklist,
	241	* otherwise 0.
	242	* Used by validate_subchannel()
	243	*/
	244	int
fb6958a5	245	is_blacklisted (int ssid, int devno)
1da177e4	246	{
fb6958a5	247	return test_bit (devno, bl_dev[ssid]);
1da177e4 LT	248	}
	249
	250	#ifdef CONFIG_PROC_FS
1da177e4 LT	251	/*
	252	* Function: blacklist_parse_proc_parameters
	253	* parse the stuff which is piped to /proc/cio_ignore
	254	*/
5b890987	255	static int blacklist_parse_proc_parameters(char *buf)
1da177e4	256	{
5b890987 ME	257	int rc;
	258	char *parm;
	259
	260	parm = strsep(&buf, " ");
	261
e6b25514	262	if (strcmp("free", parm) == 0) {
5b890987	263	rc = blacklist_parse_parameters(buf, free, 0);
e6b25514 PO	264	css_schedule_eval_all_unreg(0);
e6b25514 PO	265	} else if (strcmp("add", parm) == 0)
5b890987	266	rc = blacklist_parse_parameters(buf, add, 0);
ecf5d9ef PO	267	else if (strcmp("purge", parm) == 0)
ecf5d9ef PO	268	return ccw_purge_blacklisted();
5b890987	269	else
ecf5d9ef	270	return -EINVAL;
1da177e4	271
5b890987 ME	272
5b890987 ME	273	return rc;
1da177e4 LT	274	}
1da177e4 LT	275
678a395b CH	276	/* Iterator struct for all devices. */
	277	struct ccwdev_iter {
	278	int devno;
fb6958a5	279	int ssid;
678a395b CH	280	int in_range;
	281	};
	282
	283	static void *
	284	cio_ignore_proc_seq_start(struct seq_file s, loff_t offset)
1da177e4	285	{
05d419b1	286	struct ccwdev_iter *iter = s->private;
678a395b	287
fb6958a5	288	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	289	return NULL;
05d419b1	290	memset(iter, 0, sizeof(*iter));
fb6958a5 CH	291	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
fb6958a5 CH	292	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
678a395b CH	293	return iter;
	294	}
	295
	296	static void
	297	cio_ignore_proc_seq_stop(struct seq_file s, void it)
	298	{
678a395b	299	}
1da177e4	300
678a395b CH	301	static void *
	302	cio_ignore_proc_seq_next(struct seq_file s, void it, loff_t *offset)
	303	{
	304	struct ccwdev_iter *iter;
	305
fb6958a5	306	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	307	return NULL;
3b793060	308	iter = it;
fb6958a5 CH	309	if (iter->devno == __MAX_SUBCHANNEL) {
	310	iter->devno = 0;
	311	iter->ssid++;
	312	if (iter->ssid > __MAX_SSID)
	313	return NULL;
	314	} else
	315	iter->devno++;
678a395b CH	316	(*offset)++;
678a395b CH	317	return iter;
1da177e4 LT	318	}
1da177e4 LT	319
678a395b CH	320	static int
	321	cio_ignore_proc_seq_show(struct seq_file s, void it)
	322	{
	323	struct ccwdev_iter *iter;
	324
3b793060	325	iter = it;
fb6958a5	326	if (!is_blacklisted(iter->ssid, iter->devno))
678a395b CH	327	/* Not blacklisted, nothing to output. */
	328	return 0;
	329	if (!iter->in_range) {
	330	/* First device in range. */
	331	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
c2f0b61d	332	!is_blacklisted(iter->ssid, iter->devno + 1)) {
678a395b	333	/* Singular device. */
c2f0b61d JP	334	seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
	335	return 0;
	336	}
678a395b	337	iter->in_range = 1;
c2f0b61d JP	338	seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
c2f0b61d JP	339	return 0;
678a395b CH	340	}
678a395b CH	341	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
fb6958a5	342	!is_blacklisted(iter->ssid, iter->devno + 1)) {
678a395b CH	343	/* Last device in range. */
678a395b CH	344	iter->in_range = 0;
c2f0b61d	345	seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
678a395b CH	346	}
	347	return 0;
	348	}
	349
	350	static ssize_t
	351	cio_ignore_write(struct file file, const char __user user_buf,
	352	size_t user_len, loff_t *offset)
1da177e4 LT	353	{
1da177e4 LT	354	char *buf;
94cbc203	355	ssize_t rc, ret, i;
1da177e4	356
678a395b CH	357	if (*offset)
678a395b CH	358	return -EINVAL;
1da177e4 LT	359	if (user_len > 65536)
1da177e4 LT	360	user_len = 65536;
dc8a5c99	361	buf = vzalloc(user_len + 1); /* maybe better use the stack? */
1da177e4 LT	362	if (buf == NULL)
1da177e4 LT	363	return -ENOMEM;
5b890987	364
1da177e4	365	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
5b890987 ME	366	rc = -EFAULT;
5b890987 ME	367	goto out_free;
1da177e4	368	}
1da177e4	369
5b890987 ME	370	i = user_len - 1;
	371	while ((i >= 0) && (isspace(buf[i]) \|\| (buf[i] == 0))) {
	372	buf[i] = '\0';
	373	i--;
	374	}
	375	ret = blacklist_parse_proc_parameters(buf);
	376	if (ret)
ecf5d9ef	377	rc = ret;
5b890987 ME	378	else
5b890987 ME	379	rc = user_len;
1da177e4	380
5b890987	381	out_free:
1da177e4	382	vfree (buf);
5b890987	383	return rc;
1da177e4 LT	384	}
1da177e4 LT	385
5c81cdbe	386	static const struct seq_operations cio_ignore_proc_seq_ops = {
678a395b CH	387	.start = cio_ignore_proc_seq_start,
	388	.stop = cio_ignore_proc_seq_stop,
	389	.next = cio_ignore_proc_seq_next,
	390	.show = cio_ignore_proc_seq_show,
	391	};
	392
	393	static int
	394	cio_ignore_proc_open(struct inode inode, struct file file)
	395	{
05d419b1 CB	396	return seq_open_private(file, &cio_ignore_proc_seq_ops,
05d419b1 CB	397	sizeof(struct ccwdev_iter));
678a395b CH	398	}
678a395b CH	399
d54b1fdb	400	static const struct file_operations cio_ignore_proc_fops = {
678a395b CH	401	.open = cio_ignore_proc_open,
	402	.read = seq_read,
	403	.llseek = seq_lseek,
05d419b1	404	.release = seq_release_private,
678a395b CH	405	.write = cio_ignore_write,
	406	};
	407
1da177e4 LT	408	static int
	409	cio_ignore_proc_init (void)
	410	{
	411	struct proc_dir_entry *entry;
	412
8b594007 DL	413	entry = proc_create("cio_ignore", S_IFREG \| S_IRUGO \| S_IWUSR, NULL,
8b594007 DL	414	&cio_ignore_proc_fops);
1da177e4	415	if (!entry)
a7fbf6bb	416	return -ENOENT;
a7fbf6bb	417	return 0;
1da177e4 LT	418	}
	419
	420	__initcall (cio_ignore_proc_init);
	421
	422	#endif /* CONFIG_PROC_FS */