[linux.git] / drivers / s390 / cio / blacklist.c

/*
 *  drivers/s390/cio/blacklist.c
 *   S/390 common I/O routines -- blacklisting of specific devices
 *   $Revision: 1.35 $
 *
 *    Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
 *			      IBM Corporation
 *    Author(s): Ingo Adlung ([email protected])
 *		 Cornelia Huck ([email protected])
 *		 Arnd Bergmann ([email protected])
 */

#include <linux/config.h>
#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 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[__BL_DEV_WORDS];
typedef enum {add, free} range_action;

/*
 * Function: blacklist_range
 * (Un-)blacklist the devices from-to
 */
static inline void
blacklist_range (range_action action, unsigned int from, unsigned int to)
{
	if (!to)
		to = from;

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

/*
 * Function: blacklist_busid
 * Get devno/busid from given string.
 * Shamelessly grabbed from dasd_devmap.c.
 */
static inline int
blacklist_busid(char **str, int *id0, int *id1, 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 = *id1 = 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;
	*id1 = 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 inline int
blacklist_parse_parameters (char *str, range_action action)
{
	unsigned int from, to, from_id0, to_id0, from_id1, to_id1;

	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) {
			from = 0;
			to = __MAX_SUBCHANNEL;
			str += 3;
		} else {
			int rc;

			rc = blacklist_busid(&str, &from_id0,
					     &from_id1, &from);
			if (rc)
				continue;
			to = from;
			to_id0 = from_id0;
			to_id1 = from_id1;
			if (*str == '-') {
				str++;
				rc = blacklist_busid(&str, &to_id0,
						     &to_id1, &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_id1 != to_id1)) {
				printk(KERN_WARNING "invalid cio_ignore range "
					"%x.%x.%04x-%x.%x.%04x\n",
					from_id0, from_id1, from,
					to_id0, to_id1, to);
				continue;
			}
		}
		/* FIXME: ignoring id0 and id1 here. */
		pr_debug("blacklist_setup: adding range "
			 "from 0.0.%04x to 0.0.%04x\n", from, to);
		blacklist_range (ra, from, to);
	}
	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 devno)
{
	return test_bit (devno, bl_dev);
}

#ifdef CONFIG_PROC_FS
static int
__s390_redo_validation(struct subchannel_id schid, void *data)
{
	int ret;
	struct subchannel *sch;

	sch = get_subchannel_by_schid(schid);
	if (sch) {
		/* Already known. */
		put_device(&sch->dev);
		return 0;
	}
	ret = css_probe_device(schid);
	if (ret == -ENXIO)
		return ret; /* We're through. */
	if (ret == -ENOMEM)
		/* Stop validation for now. Bad, but no need for a panic. */
		return ret;
	return 0;
}

/*
 * Function: s390_redo_validation
 * Look for no longer blacklisted devices
 * FIXME: there must be a better way to do this */
static inline void
s390_redo_validation (void)
{
	CIO_TRACE_EVENT (0, "redoval");

	for_each_subchannel(__s390_redo_validation, NULL);
}

/*
 * Function: blacklist_parse_proc_parameters
 * parse the stuff which is piped to /proc/cio_ignore
 */
static inline 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;
	}

	s390_redo_validation ();
}

/* Iterator struct for all devices. */
struct ccwdev_iter {
	int devno;
	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)
		return NULL;
	iter = kmalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
	if (!iter)
		return ERR_PTR(-ENOMEM);
	memset(iter, 0, sizeof(struct ccwdev_iter));
	iter->devno = *offset;
	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)
		return NULL;
	iter = (struct ccwdev_iter *)it;
	iter->devno++;
	(*offset)++;
	return iter;
}

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

	iter = (struct ccwdev_iter *)it;
	if (!is_blacklisted(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->devno + 1))
			/* Singular device. */
			return seq_printf(s, "0.0.%04x\n", iter->devno);
		iter->in_range = 1;
		return seq_printf(s, "0.0.%04x-", iter->devno);
	}
	if ((iter->devno == __MAX_SUBCHANNEL) ||
	    !is_blacklisted(iter->devno + 1)) {
		/* Last device in range. */
		iter->in_range = 0;
		return seq_printf(s, "0.0.%04x\n", 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 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 0;

	entry->proc_fops = &cio_ignore_proc_fops;

	return 1;
}

__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
d176795b	4	* $Revision: 1.35 $
1da177e4 LT	5	*
	6	* Copyright (C) 1999-2002 IBM Deutschland Entwicklung GmbH,
	7	* IBM Corporation
	8	* Author(s): Ingo Adlung ([email protected])
	9	* Cornelia Huck ([email protected])
	10	* Arnd Bergmann ([email protected])
	11	*/
	12
	13	#include <linux/config.h>
	14	#include <linux/init.h>
	15	#include <linux/vmalloc.h>
	16	#include <linux/slab.h>
	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"
	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
	38	/* 65536 bits to indicate if a devno is blacklisted or not */
a8237fc4	39	#define __BL_DEV_WORDS ((__MAX_SUBCHANNEL + (8*sizeof(long) - 1)) / \
1da177e4 LT	40	(8*sizeof(long)))
	41	static unsigned long bl_dev[__BL_DEV_WORDS];
	42	typedef enum {add, free} range_action;
	43
	44	/*
	45	* Function: blacklist_range
	46	* (Un-)blacklist the devices from-to
	47	*/
	48	static inline void
	49	blacklist_range (range_action action, unsigned int from, unsigned int to)
	50	{
	51	if (!to)
	52	to = from;
	53
a8237fc4	54	if (from > to \|\| to > __MAX_SUBCHANNEL) {
1da177e4 LT	55	printk (KERN_WARNING "Invalid blacklist range "
	56	"0x%04x to 0x%04x, skipping\n", from, to);
	57	return;
	58	}
	59	for (; from <= to; from++) {
	60	if (action == add)
	61	set_bit (from, bl_dev);
	62	else
	63	clear_bit (from, bl_dev);
	64	}
	65	}
	66
	67	/*
	68	* Function: blacklist_busid
	69	* Get devno/busid from given string.
	70	* Shamelessly grabbed from dasd_devmap.c.
	71	*/
	72	static inline int
	73	blacklist_busid(char *str, int id0, int id1, int devno)
	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] != '.') {
	90	id0 = id1 = 0;
	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;
	109	*id1 = val;
	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
126	static inline int
127	blacklist_parse_parameters (char *str, range_action action)
128	{
129	unsigned int from, to, from_id0, to_id0, from_id1, to_id1;
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) {
146	from = 0;
a8237fc4	147	to = __MAX_SUBCHANNEL;
1da177e4 LT	148	str += 3;
	149	} else {
	150	int rc;
	151
	152	rc = blacklist_busid(&str, &from_id0,
	153	&from_id1, &from);
	154	if (rc)
	155	continue;
	156	to = from;
	157	to_id0 = from_id0;
	158	to_id1 = from_id1;
	159	if (*str == '-') {
	160	str++;
	161	rc = blacklist_busid(&str, &to_id0,
	162	&to_id1, &to);
	163	if (rc)
	164	continue;
	165	}
	166	if (*str == '-') {
	167	printk(KERN_WARNING "invalid cio_ignore "
	168	"parameter '%s'\n",
	169	strsep(&str, ",\n"));
	170	continue;
	171	}
	172	if ((from_id0 != to_id0) \|\| (from_id1 != to_id1)) {
	173	printk(KERN_WARNING "invalid cio_ignore range "
	174	"%x.%x.%04x-%x.%x.%04x\n",
	175	from_id0, from_id1, from,
	176	to_id0, to_id1, to);
	177	continue;
	178	}
	179	}
	180	/* FIXME: ignoring id0 and id1 here. */
	181	pr_debug("blacklist_setup: adding range "
	182	"from 0.0.%04x to 0.0.%04x\n", from, to);
	183	blacklist_range (ra, from, to);
	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
217	is_blacklisted (int devno)
218	{
219	return test_bit (devno, bl_dev);
220	}
221
222	#ifdef CONFIG_PROC_FS
f97a56fb CH	223	static int
	224	__s390_redo_validation(struct subchannel_id schid, void *data)
	225	{
	226	int ret;
	227	struct subchannel *sch;
	228
	229	sch = get_subchannel_by_schid(schid);
	230	if (sch) {
	231	/* Already known. */
	232	put_device(&sch->dev);
	233	return 0;
	234	}
	235	ret = css_probe_device(schid);
	236	if (ret == -ENXIO)
	237	return ret; /* We're through. */
	238	if (ret == -ENOMEM)
	239	/* Stop validation for now. Bad, but no need for a panic. */
	240	return ret;
	241	return 0;
	242	}
	243
1da177e4 LT	244	/*
	245	* Function: s390_redo_validation
	246	* Look for no longer blacklisted devices
	247	* FIXME: there must be a better way to do this */
	248	static inline void
	249	s390_redo_validation (void)
	250	{
1da177e4	251	CIO_TRACE_EVENT (0, "redoval");
1da177e4	252
f97a56fb	253	for_each_subchannel(__s390_redo_validation, NULL);
1da177e4 LT	254	}
	255
	256	/*
	257	* Function: blacklist_parse_proc_parameters
	258	* parse the stuff which is piped to /proc/cio_ignore
	259	*/
	260	static inline void
	261	blacklist_parse_proc_parameters (char *buf)
	262	{
	263	if (strncmp (buf, "free ", 5) == 0) {
	264	blacklist_parse_parameters (buf + 5, free);
	265	} else if (strncmp (buf, "add ", 4) == 0) {
	266	/*
	267	* We don't need to check for known devices since
	268	* css_probe_device will handle this correctly.
	269	*/
	270	blacklist_parse_parameters (buf + 4, add);
	271	} else {
	272	printk (KERN_WARNING "cio_ignore: Parse error; \n"
	273	KERN_WARNING "try using 'free all\|<devno-range>,"
	274	"<devno-range>,...'\n"
	275	KERN_WARNING "or 'add <devno-range>,"
	276	"<devno-range>,...'\n");
	277	return;
	278	}
	279
	280	s390_redo_validation ();
	281	}
	282
678a395b CH	283	/* Iterator struct for all devices. */
	284	struct ccwdev_iter {
	285	int devno;
	286	int in_range;
	287	};
	288
	289	static void *
	290	cio_ignore_proc_seq_start(struct seq_file s, loff_t offset)
1da177e4	291	{
678a395b CH	292	struct ccwdev_iter *iter;
	293
	294	if (*offset > __MAX_SUBCHANNEL)
	295	return NULL;
	296	iter = kmalloc(sizeof(struct ccwdev_iter), GFP_KERNEL);
	297	if (!iter)
	298	return ERR_PTR(-ENOMEM);
	299	memset(iter, 0, sizeof(struct ccwdev_iter));
	300	iter->devno = *offset;
	301	return iter;
	302	}
	303
	304	static void
	305	cio_ignore_proc_seq_stop(struct seq_file s, void it)
	306	{
	307	if (!IS_ERR(it))
	308	kfree(it);
	309	}
1da177e4	310
678a395b CH	311	static void *
	312	cio_ignore_proc_seq_next(struct seq_file s, void it, loff_t *offset)
	313	{
	314	struct ccwdev_iter *iter;
	315
	316	if (*offset > __MAX_SUBCHANNEL)
	317	return NULL;
	318	iter = (struct ccwdev_iter *)it;
	319	iter->devno++;
	320	(*offset)++;
	321	return iter;
1da177e4 LT	322	}
1da177e4 LT	323
678a395b CH	324	static int
	325	cio_ignore_proc_seq_show(struct seq_file s, void it)
	326	{
	327	struct ccwdev_iter *iter;
	328
	329	iter = (struct ccwdev_iter *)it;
	330	if (!is_blacklisted(iter->devno))
	331	/* Not blacklisted, nothing to output. */
	332	return 0;
	333	if (!iter->in_range) {
	334	/* First device in range. */
	335	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
	336	!is_blacklisted(iter->devno + 1))
	337	/* Singular device. */
	338	return seq_printf(s, "0.0.%04x\n", iter->devno);
	339	iter->in_range = 1;
	340	return seq_printf(s, "0.0.%04x-", iter->devno);
	341	}
	342	if ((iter->devno == __MAX_SUBCHANNEL) \|\|
	343	!is_blacklisted(iter->devno + 1)) {
	344	/* Last device in range. */
	345	iter->in_range = 0;
	346	return seq_printf(s, "0.0.%04x\n", iter->devno);
	347	}
	348	return 0;
	349	}
	350
	351	static ssize_t
	352	cio_ignore_write(struct file file, const char __user user_buf,
	353	size_t user_len, loff_t *offset)
1da177e4 LT	354	{
	355	char *buf;
	356
678a395b CH	357	if (*offset)
678a395b CH	358	return -EINVAL;
1da177e4 LT	359	if (user_len > 65536)
	360	user_len = 65536;
	361	buf = vmalloc (user_len + 1); /* maybe better use the stack? */
	362	if (buf == NULL)
	363	return -ENOMEM;
	364	if (strncpy_from_user (buf, user_buf, user_len) < 0) {
	365	vfree (buf);
	366	return -EFAULT;
	367	}
	368	buf[user_len] = '\0';
	369
	370	blacklist_parse_proc_parameters (buf);
	371
	372	vfree (buf);
	373	return user_len;
	374	}
	375
678a395b CH	376	static struct seq_operations cio_ignore_proc_seq_ops = {
	377	.start = cio_ignore_proc_seq_start,
	378	.stop = cio_ignore_proc_seq_stop,
	379	.next = cio_ignore_proc_seq_next,
	380	.show = cio_ignore_proc_seq_show,
	381	};
	382
	383	static int
	384	cio_ignore_proc_open(struct inode inode, struct file file)
	385	{
	386	return seq_open(file, &cio_ignore_proc_seq_ops);
	387	}
	388
	389	static struct file_operations cio_ignore_proc_fops = {
	390	.open = cio_ignore_proc_open,
	391	.read = seq_read,
	392	.llseek = seq_lseek,
	393	.release = seq_release,
	394	.write = cio_ignore_write,
	395	};
	396
1da177e4 LT	397	static int
	398	cio_ignore_proc_init (void)
	399	{
	400	struct proc_dir_entry *entry;
	401
	402	entry = create_proc_entry ("cio_ignore", S_IFREG \| S_IRUGO \| S_IWUSR,
	403	&proc_root);
	404	if (!entry)
	405	return 0;
	406
678a395b	407	entry->proc_fops = &cio_ignore_proc_fops;
1da177e4 LT	408
	409	return 1;
	410	}
	411
	412	__initcall (cio_ignore_proc_init);
	413
	414	#endif /* CONFIG_PROC_FS */