[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / scsi / scsi_proc.c

/*
 * linux/drivers/scsi/scsi_proc.c
 *
 * The functions in this file provide an interface between
 * the PROC file system and the SCSI device drivers
 * It is mainly used for debugging, statistics and to pass 
 * information directly to the lowlevel driver.
 *
 * (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de 
 * Version: 0.99.8   last change: 95/09/13
 * 
 * generic command parser provided by: 
 * Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
 *
 * generic_proc_info() support of xxxx_info() by:
 * Michael A. Griffith <grif@acm.org>
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/proc_fs.h>
#include <linux/errno.h>
#include <linux/blkdev.h>
#include <linux/seq_file.h>
#include <linux/mutex.h>
#include <asm/uaccess.h>

#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>

#include "scsi_priv.h"
#include "scsi_logging.h"


/* 4K page size, but our output routines, use some slack for overruns */
#define PROC_BLOCK_SIZE (3*1024)

static struct proc_dir_entry *proc_scsi;

/* Protect sht->present and sht->proc_dir */
static DEFINE_MUTEX(global_host_template_mutex);

/**
 * proc_scsi_read - handle read from /proc by calling host's proc_info() command
 * @buffer: passed to proc_info
 * @start: passed to proc_info
 * @offset: passed to proc_info
 * @length: passed to proc_info
 * @eof: returns whether length read was less than requested
 * @data: pointer to a &struct Scsi_Host
 */

static int proc_scsi_read(char *buffer, char **start, off_t offset,
			  int length, int *eof, void *data)
{
	struct Scsi_Host *shost = data;
	int n;

	n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
	*eof = (n < length);

	return n;
}

/**
 * proc_scsi_write_proc - Handle write to /proc by calling host's proc_info()
 * @file: not used
 * @buf: source of data to write.
 * @count: number of bytes (at most PROC_BLOCK_SIZE) to write.
 * @data: pointer to &struct Scsi_Host
 */
static int proc_scsi_write_proc(struct file *file, const char __user *buf,
                           unsigned long count, void *data)
{
	struct Scsi_Host *shost = data;
	ssize_t ret = -ENOMEM;
	char *page;
	char *start;
    
	if (count > PROC_BLOCK_SIZE)
		return -EOVERFLOW;

	page = (char *)__get_free_page(GFP_KERNEL);
	if (page) {
		ret = -EFAULT;
		if (copy_from_user(page, buf, count))
			goto out;
		ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
	}
out:
	free_page((unsigned long)page);
	return ret;
}

/**
 * scsi_proc_hostdir_add - Create directory in /proc for a scsi host
 * @sht: owner of this directory
 *
 * Sets sht->proc_dir to the new directory.
 */

void scsi_proc_hostdir_add(struct scsi_host_template *sht)
{
	if (!sht->proc_info)
		return;

	mutex_lock(&global_host_template_mutex);
	if (!sht->present++) {
		sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
        	if (!sht->proc_dir)
			printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
			       __FUNCTION__, sht->proc_name);
		else
			sht->proc_dir->owner = sht->module;
	}
	mutex_unlock(&global_host_template_mutex);
}

/**
 * scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
 * @sht: owner of directory
 */
void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
{
	if (!sht->proc_info)
		return;

	mutex_lock(&global_host_template_mutex);
	if (!--sht->present && sht->proc_dir) {
		remove_proc_entry(sht->proc_name, proc_scsi);
		sht->proc_dir = NULL;
	}
	mutex_unlock(&global_host_template_mutex);
}


/**
 * scsi_proc_host_add - Add entry for this host to appropriate /proc dir
 * @shost: host to add
 */
void scsi_proc_host_add(struct Scsi_Host *shost)
{
	struct scsi_host_template *sht = shost->hostt;
	struct proc_dir_entry *p;
	char name[10];

	if (!sht->proc_dir)
		return;

	sprintf(name,"%d", shost->host_no);
	p = create_proc_read_entry(name, S_IFREG | S_IRUGO | S_IWUSR,
			sht->proc_dir, proc_scsi_read, shost);
	if (!p) {
		printk(KERN_ERR "%s: Failed to register host %d in"
		       "%s\n", __FUNCTION__, shost->host_no,
		       sht->proc_name);
		return;
	} 

	p->write_proc = proc_scsi_write_proc;
	p->owner = sht->module;
}

/**
 * scsi_proc_host_rm - remove this host's entry from /proc
 * @shost: which host
 */
void scsi_proc_host_rm(struct Scsi_Host *shost)
{
	char name[10];

	if (!shost->hostt->proc_dir)
		return;

	sprintf(name,"%d", shost->host_no);
	remove_proc_entry(name, shost->hostt->proc_dir);
}
/**
 * proc_print_scsidevice - return data about this host
 * @dev: A scsi device
 * @data: &struct seq_file to output to.
 *
 * Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
 * and revision.
 */
static int proc_print_scsidevice(struct device *dev, void *data)
{
	struct scsi_device *sdev;
	struct seq_file *s = data;
	int i;

	if (!scsi_is_sdev_device(dev))
		goto out;

	sdev = to_scsi_device(dev);
	seq_printf(s,
		"Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n  Vendor: ",
		sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
	for (i = 0; i < 8; i++) {
		if (sdev->vendor[i] >= 0x20)
			seq_printf(s, "%c", sdev->vendor[i]);
		else
			seq_printf(s, " ");
	}

	seq_printf(s, " Model: ");
	for (i = 0; i < 16; i++) {
		if (sdev->model[i] >= 0x20)
			seq_printf(s, "%c", sdev->model[i]);
		else
			seq_printf(s, " ");
	}

	seq_printf(s, " Rev: ");
	for (i = 0; i < 4; i++) {
		if (sdev->rev[i] >= 0x20)
			seq_printf(s, "%c", sdev->rev[i]);
		else
			seq_printf(s, " ");
	}

	seq_printf(s, "\n");

	seq_printf(s, "  Type:   %s ", scsi_device_type(sdev->type));
	seq_printf(s, "               ANSI  SCSI revision: %02x",
			sdev->scsi_level - (sdev->scsi_level > 1));
	if (sdev->scsi_level == 2)
		seq_printf(s, " CCS\n");
	else
		seq_printf(s, "\n");

out:
	return 0;
}

/**
 * scsi_add_single_device - Respond to user request to probe for/add device
 * @host: user-supplied decimal integer
 * @channel: user-supplied decimal integer
 * @id: user-supplied decimal integer
 * @lun: user-supplied decimal integer
 *
 * Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
 *
 * does scsi_host_lookup() and either user_scan() if that transport
 * type supports it, or else scsi_scan_host_selected()
 *
 * Note: this seems to be aimed exclusively at SCSI parallel busses.
 */

static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
{
	struct Scsi_Host *shost;
	int error = -ENXIO;

	shost = scsi_host_lookup(host);
	if (IS_ERR(shost))
		return PTR_ERR(shost);

	if (shost->transportt->user_scan)
		error = shost->transportt->user_scan(shost, channel, id, lun);
	else
		error = scsi_scan_host_selected(shost, channel, id, lun, 1);
	scsi_host_put(shost);
	return error;
}

/**
 * scsi_remove_single_device - Respond to user request to remove a device
 * @host: user-supplied decimal integer
 * @channel: user-supplied decimal integer
 * @id: user-supplied decimal integer
 * @lun: user-supplied decimal integer
 *
 * Description: called by writing "scsi remove-single-device" to
 * /proc/scsi/scsi.  Does a scsi_device_lookup() and scsi_remove_device()
 */
static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
{
	struct scsi_device *sdev;
	struct Scsi_Host *shost;
	int error = -ENXIO;

	shost = scsi_host_lookup(host);
	if (IS_ERR(shost))
		return PTR_ERR(shost);
	sdev = scsi_device_lookup(shost, channel, id, lun);
	if (sdev) {
		scsi_remove_device(sdev);
		scsi_device_put(sdev);
		error = 0;
	}

	scsi_host_put(shost);
	return error;
}

/**
 * proc_scsi_write - handle writes to /proc/scsi/scsi
 * @file: not used
 * @buf: buffer to write
 * @length: length of buf, at most PAGE_SIZE
 * @ppos: not used
 *
 * Description: this provides a legacy mechanism to add or remove devices by
 * Host, Channel, ID, and Lun.  To use,
 * "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
 * "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
 * "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
 *
 * Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
 * SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
 * provide a unique identifier and nothing more.
 */


static ssize_t proc_scsi_write(struct file *file, const char __user *buf,
			       size_t length, loff_t *ppos)
{
	int host, channel, id, lun;
	char *buffer, *p;
	int err;

	if (!buf || length > PAGE_SIZE)
		return -EINVAL;

	buffer = (char *)__get_free_page(GFP_KERNEL);
	if (!buffer)
		return -ENOMEM;

	err = -EFAULT;
	if (copy_from_user(buffer, buf, length))
		goto out;

	err = -EINVAL;
	if (length < PAGE_SIZE)
		buffer[length] = '\0';
	else if (buffer[PAGE_SIZE-1])
		goto out;

	/*
	 * Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
	 * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
	 */
	if (!strncmp("scsi add-single-device", buffer, 22)) {
		p = buffer + 23;

		host = simple_strtoul(p, &p, 0);
		channel = simple_strtoul(p + 1, &p, 0);
		id = simple_strtoul(p + 1, &p, 0);
		lun = simple_strtoul(p + 1, &p, 0);

		err = scsi_add_single_device(host, channel, id, lun);

	/*
	 * Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
	 * with  "0 1 2 3" replaced by your "Host Channel Id Lun".
	 */
	} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
		p = buffer + 26;

		host = simple_strtoul(p, &p, 0);
		channel = simple_strtoul(p + 1, &p, 0);
		id = simple_strtoul(p + 1, &p, 0);
		lun = simple_strtoul(p + 1, &p, 0);

		err = scsi_remove_single_device(host, channel, id, lun);
	}

	/*
	 * convert success returns so that we return the 
	 * number of bytes consumed.
	 */
	if (!err)
		err = length;

 out:
	free_page((unsigned long)buffer);
	return err;
}

/**
 * proc_scsi_show - show contents of /proc/scsi/scsi (attached devices)
 * @s: output goes here
 * @p: not used
 */
static int proc_scsi_show(struct seq_file *s, void *p)
{
	seq_printf(s, "Attached devices:\n");
	bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
	return 0;
}

/**
 * proc_scsi_open - glue function
 * @inode: not used
 * @file: passed to single_open()
 *
 * Associates proc_scsi_show with this file
 */
static int proc_scsi_open(struct inode *inode, struct file *file)
{
	/*
	 * We don't really need this for the write case but it doesn't
	 * harm either.
	 */
	return single_open(file, proc_scsi_show, NULL);
}

static const struct file_operations proc_scsi_operations = {
	.open		= proc_scsi_open,
	.read		= seq_read,
	.write		= proc_scsi_write,
	.llseek		= seq_lseek,
	.release	= single_release,
};

/**
 * scsi_init_procfs - create scsi and scsi/scsi in procfs
 */
int __init scsi_init_procfs(void)
{
	struct proc_dir_entry *pde;

	proc_scsi = proc_mkdir("scsi", NULL);
	if (!proc_scsi)
		goto err1;

	pde = create_proc_entry("scsi/scsi", 0, NULL);
	if (!pde)
		goto err2;
	pde->proc_fops = &proc_scsi_operations;

	return 0;

err2:
	remove_proc_entry("scsi", NULL);
err1:
	return -ENOMEM;
}

/**
 * scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
 */
void scsi_exit_procfs(void)
{
	remove_proc_entry("scsi/scsi", NULL);
	remove_proc_entry("scsi", NULL);
}
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/drivers/scsi/scsi_proc.c
	3	*
	4	* The functions in this file provide an interface between
	5	* the PROC file system and the SCSI device drivers
	6	* It is mainly used for debugging, statistics and to pass
	7	* information directly to the lowlevel driver.
	8	*
	9	* (c) 1995 Michael Neuffer neuffer@goofy.zdv.uni-mainz.de
	10	* Version: 0.99.8 last change: 95/09/13
	11	*
	12	* generic command parser provided by:
	13	* Andreas Heilwagen <crashcar@informatik.uni-koblenz.de>
	14	*
	15	* generic_proc_info() support of xxxx_info() by:
	16	* Michael A. Griffith <grif@acm.org>
	17	*/
	18
	19	#include <linux/module.h>
	20	#include <linux/init.h>
	21	#include <linux/string.h>
	22	#include <linux/mm.h>
	23	#include <linux/slab.h>
	24	#include <linux/proc_fs.h>
	25	#include <linux/errno.h>
	26	#include <linux/blkdev.h>
	27	#include <linux/seq_file.h>
0b950672	28	#include <linux/mutex.h>
1da177e4 LT	29	#include <asm/uaccess.h>
	30
	31	#include <scsi/scsi.h>
	32	#include <scsi/scsi_device.h>
	33	#include <scsi/scsi_host.h>
e02f3f59	34	#include <scsi/scsi_transport.h>
1da177e4 LT	35
	36	#include "scsi_priv.h"
	37	#include "scsi_logging.h"
	38
	39
	40	/* 4K page size, but our output routines, use some slack for overruns */
	41	#define PROC_BLOCK_SIZE (3*1024)
	42
	43	static struct proc_dir_entry *proc_scsi;
	44
	45	/* Protect sht->present and sht->proc_dir */
0b950672	46	static DEFINE_MUTEX(global_host_template_mutex);
1da177e4	47
eb44820c RL	48	/**
	49	* proc_scsi_read - handle read from /proc by calling host's proc_info() command
	50	* @buffer: passed to proc_info
	51	* @start: passed to proc_info
	52	* @offset: passed to proc_info
	53	* @length: passed to proc_info
	54	* @eof: returns whether length read was less than requested
	55	* @data: pointer to a &struct Scsi_Host
	56	*/
	57
1da177e4 LT	58	static int proc_scsi_read(char buffer, char *start, off_t offset,
	59	int length, int eof, void data)
	60	{
	61	struct Scsi_Host *shost = data;
	62	int n;
	63
	64	n = shost->hostt->proc_info(shost, buffer, start, offset, length, 0);
	65	*eof = (n < length);
	66
	67	return n;
	68	}
	69
eb44820c RL	70	/**
	71	* proc_scsi_write_proc - Handle write to /proc by calling host's proc_info()
	72	* @file: not used
	73	* @buf: source of data to write.
	74	* @count: number of bytes (at most PROC_BLOCK_SIZE) to write.
	75	* @data: pointer to &struct Scsi_Host
	76	*/
1da177e4 LT	77	static int proc_scsi_write_proc(struct file file, const char __user buf,
	78	unsigned long count, void *data)
	79	{
	80	struct Scsi_Host *shost = data;
	81	ssize_t ret = -ENOMEM;
	82	char *page;
	83	char *start;
	84
	85	if (count > PROC_BLOCK_SIZE)
	86	return -EOVERFLOW;
	87
	88	page = (char *)__get_free_page(GFP_KERNEL);
	89	if (page) {
	90	ret = -EFAULT;
	91	if (copy_from_user(page, buf, count))
	92	goto out;
	93	ret = shost->hostt->proc_info(shost, page, &start, 0, count, 1);
	94	}
	95	out:
	96	free_page((unsigned long)page);
	97	return ret;
	98	}
	99
eb44820c RL	100	/**
	101	* scsi_proc_hostdir_add - Create directory in /proc for a scsi host
	102	* @sht: owner of this directory
	103	*
	104	* Sets sht->proc_dir to the new directory.
	105	*/
	106
1da177e4 LT	107	void scsi_proc_hostdir_add(struct scsi_host_template *sht)
	108	{
	109	if (!sht->proc_info)
	110	return;
	111
0b950672	112	mutex_lock(&global_host_template_mutex);
1da177e4 LT	113	if (!sht->present++) {
	114	sht->proc_dir = proc_mkdir(sht->proc_name, proc_scsi);
	115	if (!sht->proc_dir)
	116	printk(KERN_ERR "%s: proc_mkdir failed for %s\n",
	117	__FUNCTION__, sht->proc_name);
	118	else
	119	sht->proc_dir->owner = sht->module;
	120	}
0b950672	121	mutex_unlock(&global_host_template_mutex);
1da177e4 LT	122	}
1da177e4 LT	123
eb44820c RL	124	/**
	125	* scsi_proc_hostdir_rm - remove directory in /proc for a scsi host
	126	* @sht: owner of directory
	127	*/
1da177e4 LT	128	void scsi_proc_hostdir_rm(struct scsi_host_template *sht)
	129	{
	130	if (!sht->proc_info)
	131	return;
	132
0b950672	133	mutex_lock(&global_host_template_mutex);
1da177e4 LT	134	if (!--sht->present && sht->proc_dir) {
	135	remove_proc_entry(sht->proc_name, proc_scsi);
	136	sht->proc_dir = NULL;
	137	}
0b950672	138	mutex_unlock(&global_host_template_mutex);
1da177e4 LT	139	}
1da177e4 LT	140
eb44820c RL	141
	142	/**
	143	* scsi_proc_host_add - Add entry for this host to appropriate /proc dir
	144	* @shost: host to add
	145	*/
1da177e4 LT	146	void scsi_proc_host_add(struct Scsi_Host *shost)
	147	{
	148	struct scsi_host_template *sht = shost->hostt;
	149	struct proc_dir_entry *p;
	150	char name[10];
	151
	152	if (!sht->proc_dir)
	153	return;
	154
	155	sprintf(name,"%d", shost->host_no);
	156	p = create_proc_read_entry(name, S_IFREG \| S_IRUGO \| S_IWUSR,
	157	sht->proc_dir, proc_scsi_read, shost);
	158	if (!p) {
	159	printk(KERN_ERR "%s: Failed to register host %d in"
	160	"%s\n", __FUNCTION__, shost->host_no,
	161	sht->proc_name);
	162	return;
	163	}
	164
	165	p->write_proc = proc_scsi_write_proc;
	166	p->owner = sht->module;
	167	}
	168
eb44820c RL	169	/**
	170	* scsi_proc_host_rm - remove this host's entry from /proc
	171	* @shost: which host
	172	*/
1da177e4 LT	173	void scsi_proc_host_rm(struct Scsi_Host *shost)
	174	{
	175	char name[10];
	176
	177	if (!shost->hostt->proc_dir)
	178	return;
	179
	180	sprintf(name,"%d", shost->host_no);
	181	remove_proc_entry(name, shost->hostt->proc_dir);
	182	}
eb44820c RL	183	/**
	184	* proc_print_scsidevice - return data about this host
	185	* @dev: A scsi device
	186	* @data: &struct seq_file to output to.
	187	*
	188	* Description: prints Host, Channel, Id, Lun, Vendor, Model, Rev, Type,
	189	* and revision.
	190	*/
1da177e4 LT	191	static int proc_print_scsidevice(struct device dev, void data)
1da177e4 LT	192	{
b0ed4336	193	struct scsi_device *sdev;
1da177e4 LT	194	struct seq_file *s = data;
	195	int i;
	196
b0ed4336 HR	197	if (!scsi_is_sdev_device(dev))
	198	goto out;
	199
	200	sdev = to_scsi_device(dev);
1da177e4 LT	201	seq_printf(s,
	202	"Host: scsi%d Channel: %02d Id: %02d Lun: %02d\n Vendor: ",
	203	sdev->host->host_no, sdev->channel, sdev->id, sdev->lun);
	204	for (i = 0; i < 8; i++) {
	205	if (sdev->vendor[i] >= 0x20)
	206	seq_printf(s, "%c", sdev->vendor[i]);
	207	else
	208	seq_printf(s, " ");
	209	}
	210
	211	seq_printf(s, " Model: ");
	212	for (i = 0; i < 16; i++) {
	213	if (sdev->model[i] >= 0x20)
	214	seq_printf(s, "%c", sdev->model[i]);
	215	else
	216	seq_printf(s, " ");
	217	}
	218
	219	seq_printf(s, " Rev: ");
	220	for (i = 0; i < 4; i++) {
	221	if (sdev->rev[i] >= 0x20)
	222	seq_printf(s, "%c", sdev->rev[i]);
	223	else
	224	seq_printf(s, " ");
	225	}
	226
	227	seq_printf(s, "\n");
	228
4ff36718	229	seq_printf(s, " Type: %s ", scsi_device_type(sdev->type));
74feb53e AS	230	seq_printf(s, " ANSI SCSI revision: %02x",
74feb53e AS	231	sdev->scsi_level - (sdev->scsi_level > 1));
1da177e4 LT	232	if (sdev->scsi_level == 2)
	233	seq_printf(s, " CCS\n");
	234	else
	235	seq_printf(s, "\n");
	236
b0ed4336	237	out:
1da177e4 LT	238	return 0;
	239	}
	240
eb44820c RL	241	/**
	242	* scsi_add_single_device - Respond to user request to probe for/add device
	243	* @host: user-supplied decimal integer
	244	* @channel: user-supplied decimal integer
	245	* @id: user-supplied decimal integer
	246	* @lun: user-supplied decimal integer
	247	*
	248	* Description: called by writing "scsi add-single-device" to /proc/scsi/scsi.
	249	*
	250	* does scsi_host_lookup() and either user_scan() if that transport
	251	* type supports it, or else scsi_scan_host_selected()
	252	*
	253	* Note: this seems to be aimed exclusively at SCSI parallel busses.
	254	*/
	255
1da177e4 LT	256	static int scsi_add_single_device(uint host, uint channel, uint id, uint lun)
	257	{
	258	struct Scsi_Host *shost;
	259	int error = -ENXIO;
	260
	261	shost = scsi_host_lookup(host);
	262	if (IS_ERR(shost))
	263	return PTR_ERR(shost);
	264
e02f3f59 CH	265	if (shost->transportt->user_scan)
	266	error = shost->transportt->user_scan(shost, channel, id, lun);
	267	else
	268	error = scsi_scan_host_selected(shost, channel, id, lun, 1);
1da177e4 LT	269	scsi_host_put(shost);
	270	return error;
	271	}
	272
eb44820c RL	273	/**
	274	* scsi_remove_single_device - Respond to user request to remove a device
	275	* @host: user-supplied decimal integer
	276	* @channel: user-supplied decimal integer
	277	* @id: user-supplied decimal integer
	278	* @lun: user-supplied decimal integer
	279	*
	280	* Description: called by writing "scsi remove-single-device" to
	281	* /proc/scsi/scsi. Does a scsi_device_lookup() and scsi_remove_device()
	282	*/
1da177e4 LT	283	static int scsi_remove_single_device(uint host, uint channel, uint id, uint lun)
	284	{
	285	struct scsi_device *sdev;
	286	struct Scsi_Host *shost;
	287	int error = -ENXIO;
	288
	289	shost = scsi_host_lookup(host);
	290	if (IS_ERR(shost))
	291	return PTR_ERR(shost);
	292	sdev = scsi_device_lookup(shost, channel, id, lun);
	293	if (sdev) {
	294	scsi_remove_device(sdev);
	295	scsi_device_put(sdev);
	296	error = 0;
	297	}
	298
	299	scsi_host_put(shost);
	300	return error;
	301	}
	302
eb44820c RL	303	/**
	304	* proc_scsi_write - handle writes to /proc/scsi/scsi
	305	* @file: not used
	306	* @buf: buffer to write
	307	* @length: length of buf, at most PAGE_SIZE
	308	* @ppos: not used
	309	*
	310	* Description: this provides a legacy mechanism to add or remove devices by
	311	* Host, Channel, ID, and Lun. To use,
	312	* "echo 'scsi add-single-device 0 1 2 3' > /proc/scsi/scsi" or
	313	* "echo 'scsi remove-single-device 0 1 2 3' > /proc/scsi/scsi" with
	314	* "0 1 2 3" replaced by the Host, Channel, Id, and Lun.
	315	*
	316	* Note: this seems to be aimed at parallel SCSI. Most modern busses (USB,
	317	* SATA, Firewire, Fibre Channel, etc) dynamically assign these values to
	318	* provide a unique identifier and nothing more.
	319	*/
	320
	321
1da177e4 LT	322	static ssize_t proc_scsi_write(struct file file, const char __user buf,
	323	size_t length, loff_t *ppos)
	324	{
	325	int host, channel, id, lun;
	326	char buffer, p;
	327	int err;
	328
	329	if (!buf \|\| length > PAGE_SIZE)
	330	return -EINVAL;
	331
	332	buffer = (char *)__get_free_page(GFP_KERNEL);
	333	if (!buffer)
	334	return -ENOMEM;
	335
	336	err = -EFAULT;
	337	if (copy_from_user(buffer, buf, length))
	338	goto out;
	339
	340	err = -EINVAL;
	341	if (length < PAGE_SIZE)
	342	buffer[length] = '\0';
	343	else if (buffer[PAGE_SIZE-1])
	344	goto out;
	345
	346	/*
	347	* Usage: echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi
	348	* with "0 1 2 3" replaced by your "Host Channel Id Lun".
	349	*/
	350	if (!strncmp("scsi add-single-device", buffer, 22)) {
	351	p = buffer + 23;
	352
	353	host = simple_strtoul(p, &p, 0);
	354	channel = simple_strtoul(p + 1, &p, 0);
	355	id = simple_strtoul(p + 1, &p, 0);
	356	lun = simple_strtoul(p + 1, &p, 0);
	357
	358	err = scsi_add_single_device(host, channel, id, lun);
1da177e4 LT	359
	360	/*
	361	* Usage: echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi
	362	* with "0 1 2 3" replaced by your "Host Channel Id Lun".
	363	*/
	364	} else if (!strncmp("scsi remove-single-device", buffer, 25)) {
	365	p = buffer + 26;
	366
	367	host = simple_strtoul(p, &p, 0);
	368	channel = simple_strtoul(p + 1, &p, 0);
	369	id = simple_strtoul(p + 1, &p, 0);
	370	lun = simple_strtoul(p + 1, &p, 0);
	371
	372	err = scsi_remove_single_device(host, channel, id, lun);
	373	}
	374
2ca48a13 JB	375	/*
	376	* convert success returns so that we return the
	377	* number of bytes consumed.
	378	*/
	379	if (!err)
	380	err = length;
	381
1da177e4 LT	382	out:
	383	free_page((unsigned long)buffer);
	384	return err;
	385	}
	386
eb44820c RL	387	/**
	388	* proc_scsi_show - show contents of /proc/scsi/scsi (attached devices)
	389	* @s: output goes here
	390	* @p: not used
	391	*/
1da177e4 LT	392	static int proc_scsi_show(struct seq_file s, void p)
	393	{
	394	seq_printf(s, "Attached devices:\n");
	395	bus_for_each_dev(&scsi_bus_type, NULL, s, proc_print_scsidevice);
	396	return 0;
	397	}
	398
eb44820c RL	399	/**
	400	* proc_scsi_open - glue function
	401	* @inode: not used
	402	* @file: passed to single_open()
	403	*
	404	* Associates proc_scsi_show with this file
	405	*/
1da177e4 LT	406	static int proc_scsi_open(struct inode inode, struct file file)
	407	{
	408	/*
eb44820c	409	* We don't really need this for the write case but it doesn't
1da177e4 LT	410	* harm either.
	411	*/
	412	return single_open(file, proc_scsi_show, NULL);
	413	}
	414
00977a59	415	static const struct file_operations proc_scsi_operations = {
1da177e4 LT	416	.open = proc_scsi_open,
	417	.read = seq_read,
	418	.write = proc_scsi_write,
	419	.llseek = seq_lseek,
	420	.release = single_release,
	421	};
	422
eb44820c RL	423	/**
	424	* scsi_init_procfs - create scsi and scsi/scsi in procfs
	425	*/
1da177e4 LT	426	int __init scsi_init_procfs(void)
	427	{
	428	struct proc_dir_entry *pde;
	429
	430	proc_scsi = proc_mkdir("scsi", NULL);
	431	if (!proc_scsi)
	432	goto err1;
	433
	434	pde = create_proc_entry("scsi/scsi", 0, NULL);
	435	if (!pde)
	436	goto err2;
	437	pde->proc_fops = &proc_scsi_operations;
	438
	439	return 0;
	440
	441	err2:
	442	remove_proc_entry("scsi", NULL);
	443	err1:
	444	return -ENOMEM;
	445	}
	446
eb44820c RL	447	/**
	448	* scsi_exit_procfs - Remove scsi/scsi and scsi from procfs
	449	*/
1da177e4 LT	450	void scsi_exit_procfs(void)
	451	{
	452	remove_proc_entry("scsi/scsi", NULL);
	453	remove_proc_entry("scsi", NULL);
	454	}