[deliverable/linux.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 "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 "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 "invalid cio_ignore "
					"parameter '%s'\n",
					strsep(&str, ",\n"));
				continue;
			}
			if ((from_id0 != to_id0) ||
			    (from_ssid != to_ssid)) {
				printk(KERN_WARNING "invalid cio_ignore range "
					"%x.%x.%04x-%x.%x.%04x\n",
					from_id0, from_ssid, from,
					to_id0, to_ssid, to);
				continue;
			}
			pr_debug("blacklist_setup: adding range "
				 "from %x.%x.%04x to %x.%x.%04x\n",
				 from_id0, from_ssid, from, to_id0, to_ssid, to);
			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_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) {
1da177e4	54	printk (KERN_WARNING "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");
	122	printk(KERN_WARNING "Invalid cio_ignore parameter '%s'\n", sav);
	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 == '-') {
	169	printk(KERN_WARNING "invalid cio_ignore "
	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)) {
1da177e4 LT	176	printk(KERN_WARNING "invalid cio_ignore range "
1da177e4 LT	177	"%x.%x.%04x-%x.%x.%04x\n",
fb6958a5 CH	178	from_id0, from_ssid, from,
fb6958a5 CH	179	to_id0, to_ssid, to);
1da177e4 LT	180	continue;
1da177e4 LT	181	}
fb6958a5 CH	182	pr_debug("blacklist_setup: adding range "
	183	"from %x.%x.%04x to %x.%x.%04x\n",
	184	from_id0, from_ssid, from, to_id0, to_ssid, to);
	185	blacklist_range (ra, from, to, to_ssid);
1da177e4	186	}
1da177e4 LT	187	}
	188	return 1;
	189	}
	190
	191	/* Parsing the commandline for blacklist parameters, e.g. to blacklist
	192	* bus ids 0.0.1234, 0.0.1235 and 0.0.1236, you could use any of:
	193	* - cio_ignore=1234-1236
	194	* - cio_ignore=0x1234-0x1235,1236
	195	* - cio_ignore=0x1234,1235-1236
	196	* - cio_ignore=1236 cio_ignore=1234-0x1236
	197	* - cio_ignore=1234 cio_ignore=1236 cio_ignore=0x1235
	198	* - cio_ignore=0.0.1234-0.0.1236
	199	* - cio_ignore=0.0.1234,0x1235,1236
	200	* - ...
	201	*/
	202	static int __init
	203	blacklist_setup (char *str)
	204	{
	205	CIO_MSG_EVENT(6, "Reading blacklist parameters\n");
	206	return blacklist_parse_parameters (str, add);
	207	}
	208
	209	__setup ("cio_ignore=", blacklist_setup);
	210
	211	/* Checking if devices are blacklisted */
	212
	213	/*
	214	* Function: is_blacklisted
	215	* Returns 1 if the given devicenumber can be found in the blacklist,
	216	* otherwise 0.
	217	* Used by validate_subchannel()
	218	*/
	219	int
fb6958a5	220	is_blacklisted (int ssid, int devno)
1da177e4	221	{
fb6958a5	222	return test_bit (devno, bl_dev[ssid]);
1da177e4 LT	223	}
	224
	225	#ifdef CONFIG_PROC_FS
1da177e4 LT	226	/*
	227	* Function: blacklist_parse_proc_parameters
	228	* parse the stuff which is piped to /proc/cio_ignore
	229	*/
4d284cac	230	static void
1da177e4 LT	231	blacklist_parse_proc_parameters (char *buf)
	232	{
	233	if (strncmp (buf, "free ", 5) == 0) {
	234	blacklist_parse_parameters (buf + 5, free);
	235	} else if (strncmp (buf, "add ", 4) == 0) {
	236	/*
	237	* We don't need to check for known devices since
	238	* css_probe_device will handle this correctly.
	239	*/
	240	blacklist_parse_parameters (buf + 4, add);
	241	} else {
	242	printk (KERN_WARNING "cio_ignore: Parse error; \n"
	243	KERN_WARNING "try using 'free all\|<devno-range>,"
	244	"<devno-range>,...'\n"
	245	KERN_WARNING "or 'add <devno-range>,"
	246	"<devno-range>,...'\n");
	247	return;
	248	}
	249
40154b82	250	css_schedule_reprobe();
1da177e4 LT	251	}
1da177e4 LT	252
678a395b CH	253	/* Iterator struct for all devices. */
	254	struct ccwdev_iter {
	255	int devno;
fb6958a5	256	int ssid;
678a395b CH	257	int in_range;
	258	};
	259
	260	static void *
	261	cio_ignore_proc_seq_start(struct seq_file s, loff_t offset)
1da177e4	262	{
678a395b CH	263	struct ccwdev_iter *iter;
678a395b CH	264
fb6958a5	265	if (offset >= (__MAX_SUBCHANNEL + 1) (__MAX_SSID + 1))
678a395b	266	return NULL;
3b793060	267	iter = kzalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
678a395b CH	268	if (!iter)
678a395b CH	269	return ERR_PTR(-ENOMEM);
fb6958a5 CH	270	iter->ssid = *offset / (__MAX_SUBCHANNEL + 1);
fb6958a5 CH	271	iter->devno = *offset % (__MAX_SUBCHANNEL + 1);
678a395b CH	272	return iter;
	273	}
	274
	275	static void
	276	cio_ignore_proc_seq_stop(struct seq_file s, void it)
	277	{
	278	if (!IS_ERR(it))
	279	kfree(it);
	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	{
	333	char *buf;
	334
678a395b CH	335	if (*offset)
678a395b CH	336	return -EINVAL;
1da177e4 LT	337	if (user_len > 65536)
	338	user_len = 65536;
	339	buf = vmalloc (user_len + 1); /* maybe better use the stack? */
	340	if (buf == NULL)
	341	return -ENOMEM;
	342	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
	343	vfree (buf);
	344	return -EFAULT;
	345	}
	346	buf[user_len] = '\0';
	347
	348	blacklist_parse_proc_parameters (buf);
	349
	350	vfree (buf);
	351	return user_len;
	352	}
	353
678a395b CH	354	static struct seq_operations cio_ignore_proc_seq_ops = {
	355	.start = cio_ignore_proc_seq_start,
	356	.stop = cio_ignore_proc_seq_stop,
	357	.next = cio_ignore_proc_seq_next,
	358	.show = cio_ignore_proc_seq_show,
	359	};
	360
	361	static int
	362	cio_ignore_proc_open(struct inode inode, struct file file)
	363	{
	364	return seq_open(file, &cio_ignore_proc_seq_ops);
	365	}
	366
d54b1fdb	367	static const struct file_operations cio_ignore_proc_fops = {
678a395b CH	368	.open = cio_ignore_proc_open,
	369	.read = seq_read,
	370	.llseek = seq_lseek,
	371	.release = seq_release,
	372	.write = cio_ignore_write,
	373	};
	374
1da177e4 LT	375	static int
	376	cio_ignore_proc_init (void)
	377	{
	378	struct proc_dir_entry *entry;
	379
	380	entry = create_proc_entry ("cio_ignore", S_IFREG \| S_IRUGO \| S_IWUSR,
	381	&proc_root);
	382	if (!entry)
a7fbf6bb	383	return -ENOENT;
1da177e4	384
678a395b	385	entry->proc_fops = &cio_ignore_proc_fops;
1da177e4	386
a7fbf6bb	387	return 0;
1da177e4 LT	388	}
	389
	390	__initcall (cio_ignore_proc_init);
	391
	392	#endif /* CONFIG_PROC_FS */