[linux-2.6-block.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)
 */

#include <linux/init.h>
#include <linux/vmalloc.h>
#include <linux/slab.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"

/*
 * "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 void
blacklist_range (range_action action, unsigned int from, unsigned int to,
		 unsigned int ssid)
{
	if (!to)
		to = from;

	if (from > to || to > __MAX_SUBCHANNEL || ssid > __MAX_SSID) {
		printk (KERN_WARNING "cio: Invalid blacklist range "
			"0.%x.%04x to 0.%x.%04x, skipping\n",
			ssid, from, ssid, to);
		return;
	}
	for (; from <= to; from++) {
		if (action == add)
			set_bit (from, bl_dev[ssid]);
		else
			clear_bit (from, bl_dev[ssid]);
	}
}

/*
 * Function: blacklist_busid
 * Get devno/busid from given string.
 * Shamelessly grabbed from dasd_devmap.c.
 */
static int
blacklist_busid(char **str, int *id0, int *ssid, int *devno)
{
	int val, old_style;
	char *sav;

	sav = *str;

	/* check for leading '0x' */
	old_style = 0;
	if ((*str)[0] == '0' && (*str)[1] == 'x') {
		*str += 2;
		old_style = 1;
	}
	if (!isxdigit((*str)[0]))	/* We require at least one hex digit */
		goto confused;
	val = simple_strtoul(*str, str, 16);
	if (old_style || (*str)[0] != '.') {
		*id0 = *ssid = 0;
		if (val < 0 || val > 0xffff)
			goto confused;
		*devno = val;
		if ((*str)[0] != ',' && (*str)[0] != '-' &&
		    (*str)[0] != '\n' && (*str)[0] != '\0')
			goto confused;
		return 0;
	}
	/* New style x.y.z busid */
	if (val < 0 || val > 0xff)
		goto confused;
	*id0 = val;
	(*str)++;
	if (!isxdigit((*str)[0]))	/* We require at least one hex digit */
		goto confused;
	val = simple_strtoul(*str, str, 16);
	if (val < 0 || val > 0xff || (*str)++[0] != '.')
		goto confused;
	*ssid = val;
	if (!isxdigit((*str)[0]))	/* We require at least one hex digit */
		goto confused;
	val = simple_strtoul(*str, str, 16);
	if (val < 0 || val > 0xffff)
		goto confused;
	*devno = val;
	if ((*str)[0] != ',' && (*str)[0] != '-' &&
	    (*str)[0] != '\n' && (*str)[0] != '\0')
		goto confused;
	return 0;
confused:
	strsep(str, ",\n");
	printk(KERN_WARNING "cio: Invalid cio_ignore parameter '%s'\n", sav);
	return 1;
}

static int
blacklist_parse_parameters (char *str, range_action action)
{
	int from, to, from_id0, to_id0, from_ssid, to_ssid;

	while (*str != 0 && *str != '\n') {
		range_action ra = action;
		while(*str == ',')
			str++;
		if (*str == '!') {
			ra = !action;
			++str;
		}

		/*
		 * Since we have to parse the proc commands and the
		 * kernel arguments we have to check four cases
		 */
		if (strncmp(str,"all,",4) == 0 || strcmp(str,"all") == 0 ||
		    strncmp(str,"all\n",4) == 0 || strncmp(str,"all ",4) == 0) {
			int j;

			str += 3;
			for (j=0; j <= __MAX_SSID; j++)
				blacklist_range(ra, 0, __MAX_SUBCHANNEL, j);
		} else {
			int rc;

			rc = blacklist_busid(&str, &from_id0,
					     &from_ssid, &from);
			if (rc)
				continue;
			to = from;
			to_id0 = from_id0;
			to_ssid = from_ssid;
			if (*str == '-') {
				str++;
				rc = blacklist_busid(&str, &to_id0,
						     &to_ssid, &to);
				if (rc)
					continue;
			}
			if (*str == '-') {
				printk(KERN_WARNING "cio: invalid cio_ignore "
					"parameter '%s'\n",
					strsep(&str, ",\n"));
				continue;
			}
			if ((from_id0 != to_id0) ||
			    (from_ssid != to_ssid)) {
				printk(KERN_WARNING "cio: invalid cio_ignore "
				       "range %x.%x.%04x-%x.%x.%04x\n",
				       from_id0, from_ssid, from,
				       to_id0, to_ssid, to);
				continue;
			}
			blacklist_range (ra, from, to, to_ssid);
		}
	}
	return 1;
}

/* Parsing the commandline for blacklist parameters, e.g. to blacklist
 * bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of:
 * - cio_ignore=1234-1236
 * - cio_ignore=0x1234-0x1235,1236
 * - cio_ignore=0x1234,1235-1236
 * - cio_ignore=1236 cio_ignore=1234-0x1236
 * - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235
 * - cio_ignore=0.0.1234-0.0.1236
 * - cio_ignore=0.0.1234,0x1235,1236
 * - ...
 */
static int __init
blacklist_setup (char *str)
{
	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	return blacklist_parse_parameters (str, add);
}

__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 void
blacklist_parse_proc_parameters (char *buf)
{
	if (strncmp (buf, "free ", 5) == 0) {
		blacklist_parse_parameters (buf + 5, free);
	} else if (strncmp (buf, "add ", 4) == 0) {
		/* 
		 * We don't need to check for known devices since
		 * css_probe_device will handle this correctly. 
		 */
		blacklist_parse_parameters (buf + 4, add);
	} else {
		printk (KERN_WARNING "cio: cio_ignore: Parse error; \n"
			KERN_WARNING "try using 'free all|<devno-range>,"
				     "<devno-range>,...'\n"
			KERN_WARNING "or 'add <devno-range>,"
				     "<devno-range>,...'\n");
		return;
	}

	css_schedule_reprobe();
}

/* 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;

	if (*offset >= (__MAX_SUBCHANNEL + 1) * (__MAX_SSID + 1))
		return NULL;
	iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
	if (!iter)
		return ERR_PTR(-ENOMEM);
	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)
{
	if (!IS_ERR(it))
		kfree(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;

	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;
	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
		vfree (buf);
		return -EFAULT;
	}
	buf[user_len] = '\0';

	blacklist_parse_proc_parameters (buf);

	vfree (buf);
	return user_len;
}

static 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(file, &cio_ignore_proc_seq_ops);
}

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

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

	entry = create_proc_entry ("cio_ignore", S_IFREG | S_IRUGO | S_IWUSR,
				   &proc_root);
	if (!entry)
		return -ENOENT;

	entry->proc_fops = &cio_ignore_proc_fops;

	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
1da177e4 LT	12	#include <linux/init.h>
	13	#include <linux/vmalloc.h>
	14	#include <linux/slab.h>
	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
	20	#include <asm/cio.h>
	21	#include <asm/uaccess.h>
	22
	23	#include "blacklist.h"
	24	#include "cio.h"
	25	#include "cio_debug.h"
	26	#include "css.h"
	27
	28	/*
	29	* "Blacklisting" of certain devices:
	30	* Device numbers given in the commandline as cio_ignore=... won't be known
	31	* to Linux.
	32	*
	33	* These can be single devices or ranges of devices
	34	*/
	35
fb6958a5	36	/* 65536 bits for each set to indicate if a devno is blacklisted or not */
a8237fc4	37	#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1da177e4	38	(8*sizeof(long)))
fb6958a5	39	static unsigned long bl_dev[__MAX_SSID + 1][__BL_DEV_WORDS];
1da177e4 LT	40	typedef enum {add, free} range_action;
	41
	42	/*
	43	* Function: blacklist_range
	44	* (Un-)blacklist the devices from-to
	45	*/
4d284cac	46	static void
fb6958a5 CH	47	blacklist_range (range_action action, unsigned int from, unsigned int to,
fb6958a5 CH	48	unsigned int ssid)
1da177e4 LT	49	{
	50	if (!to)
	51	to = from;
	52
fb6958a5	53	if (from > to \|\| to > __MAX_SUBCHANNEL \|\| ssid > __MAX_SSID) {
e556bbbd	54	printk (KERN_WARNING "cio: Invalid blacklist range "
fb6958a5 CH	55	"0.%x.%04x to 0.%x.%04x, skipping\n",
fb6958a5 CH	56	ssid, from, ssid, to);
1da177e4 LT	57	return;
	58	}
	59	for (; from <= to; from++) {
	60	if (action == add)
fb6958a5	61	set_bit (from, bl_dev[ssid]);
1da177e4	62	else
fb6958a5	63	clear_bit (from, bl_dev[ssid]);
1da177e4 LT	64	}
	65	}
	66
	67	/*
	68	* Function: blacklist_busid
	69	* Get devno/busid from given string.
	70	* Shamelessly grabbed from dasd_devmap.c.
	71	*/
4d284cac	72	static int
fb6958a5	73	blacklist_busid(char *str, int id0, int ssid, int devno)
1da177e4 LT	74	{
	75	int val, old_style;
	76	char *sav;
	77
	78	sav = *str;
	79
	80	/* check for leading '0x' */
	81	old_style = 0;
	82	if ((str)[0] == '0' && (str)[1] == 'x') {
	83	*str += 2;
	84	old_style = 1;
	85	}
	86	if (!isxdigit((str)[0])) / We require at least one hex digit */
	87	goto confused;
	88	val = simple_strtoul(*str, str, 16);
	89	if (old_style \|\| (*str)[0] != '.') {
fb6958a5	90	id0 = ssid = 0;
1da177e4 LT	91	if (val < 0 \|\| val > 0xffff)
	92	goto confused;
	93	*devno = val;
	94	if ((str)[0] != ',' && (str)[0] != '-' &&
	95	(str)[0] != '\n' && (str)[0] != '\0')
	96	goto confused;
	97	return 0;
	98	}
	99	/* New style x.y.z busid */
	100	if (val < 0 \|\| val > 0xff)
	101	goto confused;
	102	*id0 = val;
	103	(*str)++;
	104	if (!isxdigit((str)[0])) / We require at least one hex digit */
	105	goto confused;
	106	val = simple_strtoul(*str, str, 16);
	107	if (val < 0 \|\| val > 0xff \|\| (*str)++[0] != '.')
	108	goto confused;
fb6958a5	109	*ssid = val;
1da177e4 LT	110	if (!isxdigit((str)[0])) / We require at least one hex digit */
	111	goto confused;
	112	val = simple_strtoul(*str, str, 16);
	113	if (val < 0 \|\| val > 0xffff)
	114	goto confused;
	115	*devno = val;
	116	if ((str)[0] != ',' && (str)[0] != '-' &&
	117	(str)[0] != '\n' && (str)[0] != '\0')
	118	goto confused;
	119	return 0;
	120	confused:
	121	strsep(str, ",\n");
e556bbbd	122	printk(KERN_WARNING "cio: Invalid cio_ignore parameter '%s'\n", sav);
1da177e4 LT	123	return 1;
	124	}
	125
4d284cac	126	static int
1da177e4 LT	127	blacklist_parse_parameters (char *str, range_action action)
1da177e4 LT	128	{
2b67fc46	129	int from, to, from_id0, to_id0, from_ssid, to_ssid;
1da177e4 LT	130
	131	while (str != 0 && str != '\n') {
	132	range_action ra = action;
	133	while(*str == ',')
	134	str++;
	135	if (*str == '!') {
	136	ra = !action;
	137	++str;
	138	}
	139
	140	/*
	141	* Since we have to parse the proc commands and the
	142	* kernel arguments we have to check four cases
	143	*/
	144	if (strncmp(str,"all,",4) == 0 \|\| strcmp(str,"all") == 0 \|\|
	145	strncmp(str,"all\n",4) == 0 \|\| strncmp(str,"all ",4) == 0) {
fb6958a5 CH	146	int j;
fb6958a5 CH	147
1da177e4	148	str += 3;
fb6958a5 CH	149	for (j=0; j <= __MAX_SSID; j++)
fb6958a5 CH	150	blacklist_range(ra, 0, __MAX_SUBCHANNEL, j);
1da177e4 LT	151	} else {
	152	int rc;
	153
	154	rc = blacklist_busid(&str, &from_id0,
fb6958a5	155	&from_ssid, &from);
1da177e4 LT	156	if (rc)
	157	continue;
	158	to = from;
	159	to_id0 = from_id0;
fb6958a5	160	to_ssid = from_ssid;
1da177e4 LT	161	if (*str == '-') {
	162	str++;
	163	rc = blacklist_busid(&str, &to_id0,
fb6958a5	164	&to_ssid, &to);
1da177e4 LT	165	if (rc)
	166	continue;
	167	}
	168	if (*str == '-') {
e556bbbd	169	printk(KERN_WARNING "cio: invalid cio_ignore "
1da177e4 LT	170	"parameter '%s'\n",
	171	strsep(&str, ",\n"));
	172	continue;
	173	}
fb6958a5 CH	174	if ((from_id0 != to_id0) \|\|
fb6958a5 CH	175	(from_ssid != to_ssid)) {
e556bbbd CH	176	printk(KERN_WARNING "cio: invalid cio_ignore "
	177	"range %x.%x.%04x-%x.%x.%04x\n",
	178	from_id0, from_ssid, from,
	179	to_id0, to_ssid, to);
1da177e4 LT	180	continue;
1da177e4 LT	181	}
fb6958a5	182	blacklist_range (ra, from, to, to_ssid);
1da177e4	183	}
1da177e4 LT	184	}
	185	return 1;
	186	}
	187
	188	/* Parsing the commandline for blacklist parameters, e.g. to blacklist
	189	* bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of:
	190	* - cio_ignore=1234-1236
	191	* - cio_ignore=0x1234-0x1235,1236
	192	* - cio_ignore=0x1234,1235-1236
	193	* - cio_ignore=1236 cio_ignore=1234-0x1236
	194	* - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235
	195	* - cio_ignore=0.0.1234-0.0.1236
	196	* - cio_ignore=0.0.1234,0x1235,1236
	197	* - ...
	198	*/
	199	static int __init
	200	blacklist_setup (char *str)
	201	{
	202	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	203	return blacklist_parse_parameters (str, add);
	204	}
	205
	206	__setup ("cio_ignore=", blacklist_setup);
	207
	208	/* Checking if devices are blacklisted */
	209
	210	/*
	211	* Function: is_blacklisted
	212	* Returns 1 if the given devicenumber can be found in the blacklist,
	213	* otherwise 0.
	214	* Used by validate_subchannel()
	215	*/
	216	int
fb6958a5	217	is_blacklisted (int ssid, int devno)
1da177e4	218	{
fb6958a5	219	return test_bit (devno, bl_dev[ssid]);
1da177e4 LT	220	}
	221
	222	#ifdef CONFIG_PROC_FS
1da177e4 LT	223	/*
	224	* Function: blacklist_parse_proc_parameters
	225	* parse the stuff which is piped to /proc/cio_ignore
	226	*/
4d284cac	227	static void
1da177e4 LT	228	blacklist_parse_proc_parameters (char *buf)
	229	{
	230	if (strncmp (buf, "free ", 5) == 0) {
	231	blacklist_parse_parameters (buf + 5, free);
	232	} else if (strncmp (buf, "add ", 4) == 0) {
	233	/*
	234	* We don't need to check for known devices since
	235	* css_probe_device will handle this correctly.
	236	*/
	237	blacklist_parse_parameters (buf + 4, add);
	238	} else {
e556bbbd	239	printk (KERN_WARNING "cio: cio_ignore: Parse error; \n"
1da177e4 LT	240	KERN_WARNING "try using 'free all\|<devno-range>,"
	241	"<devno-range>,...'\n"
	242	KERN_WARNING "or 'add <devno-range>,"
	243	"<devno-range>,...'\n");
	244	return;
	245	}
	246
40154b82	247	css_schedule_reprobe();
1da177e4 LT	248	}
1da177e4 LT	249
678a395b CH	250	/* Iterator struct for all devices. */
	251	struct ccwdev_iter {
	252	int devno;
fb6958a5	253	int ssid;
678a395b CH	254	int in_range;
	255	};
	256
	257	static void *
	258	cio_ignore_proc_seq_start(struct seq_file s, loff_t offset)
1da177e4	259	{
678a395b CH	260	struct ccwdev_iter *iter;
678a395b CH	261
fb6958a5	262	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	263	return NULL;
3b793060	264	iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
678a395b CH	265	if (!iter)
678a395b CH	266	return ERR_PTR(-ENOMEM);
fb6958a5 CH	267	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
fb6958a5 CH	268	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
678a395b CH	269	return iter;
	270	}
	271
	272	static void
	273	cio_ignore_proc_seq_stop(struct seq_file s, void it)
	274	{
	275	if (!IS_ERR(it))
	276	kfree(it);
	277	}
1da177e4	278
678a395b CH	279	static void *
	280	cio_ignore_proc_seq_next(struct seq_file s, void it, loff_t *offset)
	281	{
	282	struct ccwdev_iter *iter;
	283
fb6958a5	284	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	285	return NULL;
3b793060	286	iter = it;
fb6958a5 CH	287	if (iter->devno == __MAX_SUBCHANNEL) {
	288	iter->devno = 0;
	289	iter->ssid++;
	290	if (iter->ssid > __MAX_SSID)
	291	return NULL;
	292	} else
	293	iter->devno++;
678a395b CH	294	(*offset)++;
678a395b CH	295	return iter;
1da177e4 LT	296	}
1da177e4 LT	297
678a395b CH	298	static int
	299	cio_ignore_proc_seq_show(struct seq_file s, void it)
	300	{
	301	struct ccwdev_iter *iter;
	302
3b793060	303	iter = it;
fb6958a5	304	if (!is_blacklisted(iter->ssid, iter->devno))
678a395b CH	305	/* Not blacklisted, nothing to output. */
	306	return 0;
	307	if (!iter->in_range) {
	308	/* First device in range. */
	309	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
fb6958a5	310	!is_blacklisted(iter->ssid, iter->devno + 1))
678a395b	311	/* Singular device. */
fb6958a5 CH	312	return seq_printf(s, "0.%x.%04x\n",
fb6958a5 CH	313	iter->ssid, iter->devno);
678a395b	314	iter->in_range = 1;
fb6958a5	315	return seq_printf(s, "0.%x.%04x-", iter->ssid, iter->devno);
678a395b CH	316	}
678a395b CH	317	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
fb6958a5	318	!is_blacklisted(iter->ssid, iter->devno + 1)) {
678a395b CH	319	/* Last device in range. */
678a395b CH	320	iter->in_range = 0;
fb6958a5	321	return seq_printf(s, "0.%x.%04x\n", iter->ssid, iter->devno);
678a395b CH	322	}
	323	return 0;
	324	}
	325
	326	static ssize_t
	327	cio_ignore_write(struct file file, const char __user user_buf,
	328	size_t user_len, loff_t *offset)
1da177e4 LT	329	{
	330	char *buf;
	331
678a395b CH	332	if (*offset)
678a395b CH	333	return -EINVAL;
1da177e4 LT	334	if (user_len > 65536)
	335	user_len = 65536;
	336	buf = vmalloc (user_len + 1); /* maybe better use the stack? */
	337	if (buf == NULL)
	338	return -ENOMEM;
	339	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
	340	vfree (buf);
	341	return -EFAULT;
	342	}
	343	buf[user_len] = '\0';
	344
	345	blacklist_parse_proc_parameters (buf);
	346
	347	vfree (buf);
	348	return user_len;
	349	}
	350
678a395b CH	351	static struct seq_operations cio_ignore_proc_seq_ops = {
	352	.start = cio_ignore_proc_seq_start,
	353	.stop = cio_ignore_proc_seq_stop,
	354	.next = cio_ignore_proc_seq_next,
	355	.show = cio_ignore_proc_seq_show,
	356	};
	357
	358	static int
	359	cio_ignore_proc_open(struct inode inode, struct file file)
	360	{
	361	return seq_open(file, &cio_ignore_proc_seq_ops);
	362	}
	363
d54b1fdb	364	static const struct file_operations cio_ignore_proc_fops = {
678a395b CH	365	.open = cio_ignore_proc_open,
	366	.read = seq_read,
	367	.llseek = seq_lseek,
	368	.release = seq_release,
	369	.write = cio_ignore_write,
	370	};
	371
1da177e4 LT	372	static int
	373	cio_ignore_proc_init (void)
	374	{
	375	struct proc_dir_entry *entry;
	376
	377	entry = create_proc_entry ("cio_ignore", S_IFREG \| S_IRUGO \| S_IWUSR,
	378	&proc_root);
	379	if (!entry)
a7fbf6bb	380	return -ENOENT;
1da177e4	381
678a395b	382	entry->proc_fops = &cio_ignore_proc_fops;
1da177e4	383
a7fbf6bb	384	return 0;
1da177e4 LT	385	}
	386
	387	__initcall (cio_ignore_proc_init);
	388
	389	#endif /* CONFIG_PROC_FS */