[mirror_ubuntu-zesty-kernel.git] / drivers / s390 / block / dasd_ioctl.c

/*
 * File...........: linux/drivers/s390/block/dasd_ioctl.c
 * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
 *		    Horst Hummel <Horst.Hummel@de.ibm.com>
 *		    Carsten Otte <Cotte@de.ibm.com>
 *		    Martin Schwidefsky <schwidefsky@de.ibm.com>
 * Bugreports.to..: <Linux390@de.ibm.com>
 * (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
 *
 * $Revision: 1.50 $
 *
 * i/o controls for the dasd driver.
 */
#include <linux/config.h>
#include <linux/interrupt.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>

#include <asm/ccwdev.h>
#include <asm/uaccess.h>

/* This is ugly... */
#define PRINTK_HEADER "dasd_ioctl:"

#include "dasd_int.h"

/*
 * SECTION: ioctl functions.
 */
static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list);

/*
 * Find the ioctl with number no.
 */
static struct dasd_ioctl *
dasd_find_ioctl(int no)
{
	struct dasd_ioctl *ioctl;

	list_for_each_entry (ioctl, &dasd_ioctl_list, list)
		if (ioctl->no == no)
			return ioctl;
	return NULL;
}

/*
 * Register ioctl with number no.
 */
int
dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler)
{
	struct dasd_ioctl *new;
	if (dasd_find_ioctl(no))
		return -EBUSY;
	new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL);
	if (new == NULL)
		return -ENOMEM;
	new->owner = owner;
	new->no = no;
	new->handler = handler;
	list_add(&new->list, &dasd_ioctl_list);
	return 0;
}

/*
 * Deregister ioctl with number no.
 */
int
dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
{
	struct dasd_ioctl *old = dasd_find_ioctl(no);
	if (old == NULL)
		return -ENOENT;
	if (old->no != no || old->handler != handler || owner != old->owner)
		return -EINVAL;
	list_del(&old->list);
	kfree(old);
	return 0;
}

int
dasd_ioctl(struct inode *inp, struct file *filp,
	   unsigned int no, unsigned long data)
{
	struct block_device *bdev = inp->i_bdev;
	struct dasd_device *device = bdev->bd_disk->private_data;
	struct dasd_ioctl *ioctl;
	const char *dir;
	int rc;

	if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
		PRINT_DEBUG("empty data ptr");
		return -EINVAL;
	}
	dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
		_IOC_DIR (no) == _IOC_READ ? "r" :
		_IOC_DIR (no) == _IOC_WRITE ? "w" : 
		_IOC_DIR (no) == (_IOC_READ | _IOC_WRITE) ? "rw" : "u";
	DBF_DEV_EVENT(DBF_DEBUG, device,
		      "ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
		      dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
	/* Search for ioctl no in the ioctl list. */
	list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
		if (ioctl->no == no) {
			/* Found a matching ioctl. Call it. */
			if (!try_module_get(ioctl->owner))
				continue;
			rc = ioctl->handler(bdev, no, data);
			module_put(ioctl->owner);
			return rc;
		}
	}
	/* No ioctl with number no. */
	DBF_DEV_EVENT(DBF_INFO, device,
		      "unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
		      dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
	return -EINVAL;
}

static int
dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
{
	int ver = DASD_API_VERSION;
	return put_user(ver, (int __user *) args);
}

/*
 * Enable device.
 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
 */
static int
dasd_ioctl_enable(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;
	dasd_enable_device(device);
	/* Formatting the dasd device can change the capacity. */
	down(&bdev->bd_sem);
	i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
	up(&bdev->bd_sem);
	return 0;
}

/*
 * Disable device.
 * Used by dasdfmt. Disable I/O operations but allow ioctls.
 */
static int
dasd_ioctl_disable(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;
	/*
	 * Man this is sick. We don't do a real disable but only downgrade
	 * the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
	 * BIODASDDISABLE to disable accesses to the device via the block
	 * device layer but it still wants to do i/o on the device by
	 * using the BIODASDFMT ioctl. Therefore the correct state for the
	 * device is DASD_STATE_BASIC that allows to do basic i/o.
	 */
	dasd_set_target_state(device, DASD_STATE_BASIC);
	/*
	 * Set i_size to zero, since read, write, etc. check against this
	 * value.
	 */
	down(&bdev->bd_sem);
	i_size_write(bdev->bd_inode, 0);
	up(&bdev->bd_sem);
	return 0;
}

/*
 * Quiesce device.
 */
static int
dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;
	unsigned long flags;
	
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;
	
	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;
	
	DEV_MESSAGE (KERN_DEBUG, device, "%s",
		     "Quiesce IO on device");
	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	device->stopped |= DASD_STOPPED_QUIESCE;
	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
	return 0;
}


/*
 * Quiesce device.
 */
static int
dasd_ioctl_resume(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;
	unsigned long flags;
	
	if (!capable (CAP_SYS_ADMIN)) 
		return -EACCES;

	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;

	DEV_MESSAGE (KERN_DEBUG, device, "%s",
		     "resume IO on device");
	
	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	device->stopped &= ~DASD_STOPPED_QUIESCE;
	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);

	dasd_schedule_bh (device);
	return 0;
}

/*
 * performs formatting of _device_ according to _fdata_
 * Note: The discipline's format_function is assumed to deliver formatting
 * commands to format a single unit of the device. In terms of the ECKD
 * devices this means CCWs are generated to format a single track.
 */
static int
dasd_format(struct dasd_device * device, struct format_data_t * fdata)
{
	struct dasd_ccw_req *cqr;
	int rc;

	if (device->discipline->format_device == NULL)
		return -EPERM;

	if (device->state != DASD_STATE_BASIC) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "dasd_format: device is not disabled! ");
		return -EBUSY;
	}

	DBF_DEV_EVENT(DBF_NOTICE, device,
		      "formatting units %d to %d (%d B blocks) flags %d",
		      fdata->start_unit,
		      fdata->stop_unit, fdata->blksize, fdata->intensity);

	/* Since dasdfmt keeps the device open after it was disabled,
	 * there still exists an inode for this device.
	 * We must update i_blkbits, otherwise we might get errors when
	 * enabling the device later.
	 */
	if (fdata->start_unit == 0) {
		struct block_device *bdev = bdget_disk(device->gdp, 0);
		bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
		bdput(bdev);
	}

	while (fdata->start_unit <= fdata->stop_unit) {
		cqr = device->discipline->format_device(device, fdata);
		if (IS_ERR(cqr))
			return PTR_ERR(cqr);
		rc = dasd_sleep_on_interruptible(cqr);
		dasd_sfree_request(cqr, cqr->device);
		if (rc) {
			if (rc != -ERESTARTSYS)
				DEV_MESSAGE(KERN_ERR, device,
					    " Formatting of unit %d failed "
					    "with rc = %d",
					    fdata->start_unit, rc);
			return rc;
		}
		fdata->start_unit++;
	}
	return 0;
}

/*
 * Format device.
 */
static int
dasd_ioctl_format(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;
	struct format_data_t fdata;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!args)
		return -EINVAL;
	/* fdata == NULL is no longer a valid arg to dasd_format ! */
	device = bdev->bd_disk->private_data;

	if (device == NULL)
		return -ENODEV;

	if (device->features & DASD_FEATURE_READONLY)
		return -EROFS;
	if (copy_from_user(&fdata, (void __user *) args,
			   sizeof (struct format_data_t)))
		return -EFAULT;
	if (bdev != bdev->bd_contains) {
		DEV_MESSAGE(KERN_WARNING, device, "%s",
			    "Cannot low-level format a partition");
		return -EINVAL;
	}
	return dasd_format(device, &fdata);
}

#ifdef CONFIG_DASD_PROFILE
/*
 * Reset device profile information
 */
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;

	memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
	return 0;
}

/*
 * Return device profile information
 */
static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;

	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;

	if (dasd_profile_level == DASD_PROFILE_OFF)
		return -EIO;

	if (copy_to_user((long __user *) args, (long *) &device->profile,
			 sizeof (struct dasd_profile_info_t)))
		return -EFAULT;
	return 0;
}
#else
static int
dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
{
	return -ENOSYS;
}

static int
dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
{
	return -ENOSYS;
}
#endif

/*
 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 */
static int
dasd_ioctl_information(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;
	struct dasd_information2_t *dasd_info;
	unsigned long flags;
	int rc;
	struct ccw_device *cdev;

	device = bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;

	if (!device->discipline->fill_info)
		return -EINVAL;

	dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
	if (dasd_info == NULL)
		return -ENOMEM;

	rc = device->discipline->fill_info(device, dasd_info);
	if (rc) {
		kfree(dasd_info);
		return rc;
	}

	cdev = device->cdev;

	dasd_info->devno = _ccw_device_get_device_number(device->cdev);
	dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev);
	dasd_info->cu_type = cdev->id.cu_type;
	dasd_info->cu_model = cdev->id.cu_model;
	dasd_info->dev_type = cdev->id.dev_type;
	dasd_info->dev_model = cdev->id.dev_model;
	dasd_info->open_count = atomic_read(&device->open_count);
	dasd_info->status = device->state;
	
	/*
	 * check if device is really formatted
	 * LDL / CDL was returned by 'fill_info'
	 */
	if ((device->state < DASD_STATE_READY) ||
	    (dasd_check_blocksize(device->bp_block)))
		dasd_info->format = DASD_FORMAT_NONE;

	dasd_info->features |=
		((device->features & DASD_FEATURE_READONLY) != 0);

	if (device->discipline)
		memcpy(dasd_info->type, device->discipline->name, 4);
	else
		memcpy(dasd_info->type, "none", 4);
	dasd_info->req_queue_len = 0;
	dasd_info->chanq_len = 0;
	if (device->request_queue->request_fn) {
		struct list_head *l;
#ifdef DASD_EXTENDED_PROFILING
		{
			struct list_head *l;
			spin_lock_irqsave(&device->lock, flags);
			list_for_each(l, &device->request_queue->queue_head)
				dasd_info->req_queue_len++;
			spin_unlock_irqrestore(&device->lock, flags);
		}
#endif				/* DASD_EXTENDED_PROFILING */
		spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
		list_for_each(l, &device->ccw_queue)
			dasd_info->chanq_len++;
		spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
				       flags);
	}

	rc = 0;
	if (copy_to_user((long __user *) args, (long *) dasd_info,
			 ((no == (unsigned int) BIODASDINFO2) ?
			  sizeof (struct dasd_information2_t) :
			  sizeof (struct dasd_information_t))))
		rc = -EFAULT;
	kfree(dasd_info);
	return rc;
}

/*
 * Set read only
 */
static int
dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
{
	struct dasd_device *device;
	int intval, rc;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (bdev != bdev->bd_contains)
		// ro setting is not allowed for partitions
		return -EINVAL;
	if (get_user(intval, (int __user *) args))
		return -EFAULT;
	device =  bdev->bd_disk->private_data;
	if (device == NULL)
		return -ENODEV;

	set_disk_ro(bdev->bd_disk, intval);
	rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);

	return rc;
}

/*
 * List of static ioctls.
 */
static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
{
	{ BIODASDDISABLE, dasd_ioctl_disable },
	{ BIODASDENABLE, dasd_ioctl_enable },
	{ BIODASDQUIESCE, dasd_ioctl_quiesce },
	{ BIODASDRESUME, dasd_ioctl_resume },
	{ BIODASDFMT, dasd_ioctl_format },
	{ BIODASDINFO, dasd_ioctl_information },
	{ BIODASDINFO2, dasd_ioctl_information },
	{ BIODASDPRRD, dasd_ioctl_read_profile },
	{ BIODASDPRRST, dasd_ioctl_reset_profile },
	{ BLKROSET, dasd_ioctl_set_ro },
	{ DASDAPIVER, dasd_ioctl_api_version },
	{ -1, NULL }
};

int
dasd_ioctl_init(void)
{
	int i;

	for (i = 0; dasd_ioctls[i].no != -1; i++)
		dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
				       dasd_ioctls[i].fn);
	return 0;

}

void
dasd_ioctl_exit(void)
{
	int i;

	for (i = 0; dasd_ioctls[i].no != -1; i++)
		dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
					 dasd_ioctls[i].fn);

}

EXPORT_SYMBOL(dasd_ioctl_no_register);
EXPORT_SYMBOL(dasd_ioctl_no_unregister);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* File...........: linux/drivers/s390/block/dasd_ioctl.c
	3	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	4	* Horst Hummel <Horst.Hummel@de.ibm.com>
	5	* Carsten Otte <Cotte@de.ibm.com>
	6	* Martin Schwidefsky <schwidefsky@de.ibm.com>
	7	* Bugreports.to..: <Linux390@de.ibm.com>
	8	* (C) IBM Corporation, IBM Deutschland Entwicklung GmbH, 1999-2001
	9	*
9a7af289	10	* $Revision: 1.50 $
f24acd45	11	*
1da177e4 LT	12	* i/o controls for the dasd driver.
	13	*/
	14	#include <linux/config.h>
	15	#include <linux/interrupt.h>
	16	#include <linux/major.h>
	17	#include <linux/fs.h>
	18	#include <linux/blkpg.h>
	19
	20	#include <asm/ccwdev.h>
	21	#include <asm/uaccess.h>
	22
	23	/* This is ugly... */
	24	#define PRINTK_HEADER "dasd_ioctl:"
	25
	26	#include "dasd_int.h"
	27
	28	/*
	29	* SECTION: ioctl functions.
	30	*/
	31	static struct list_head dasd_ioctl_list = LIST_HEAD_INIT(dasd_ioctl_list);
	32
	33	/*
	34	* Find the ioctl with number no.
	35	*/
	36	static struct dasd_ioctl *
	37	dasd_find_ioctl(int no)
	38	{
	39	struct dasd_ioctl *ioctl;
	40
	41	list_for_each_entry (ioctl, &dasd_ioctl_list, list)
	42	if (ioctl->no == no)
	43	return ioctl;
	44	return NULL;
	45	}
	46
	47	/*
	48	* Register ioctl with number no.
	49	*/
	50	int
	51	dasd_ioctl_no_register(struct module *owner, int no, dasd_ioctl_fn_t handler)
	52	{
	53	struct dasd_ioctl *new;
	54	if (dasd_find_ioctl(no))
	55	return -EBUSY;
	56	new = kmalloc(sizeof (struct dasd_ioctl), GFP_KERNEL);
	57	if (new == NULL)
	58	return -ENOMEM;
	59	new->owner = owner;
	60	new->no = no;
	61	new->handler = handler;
	62	list_add(&new->list, &dasd_ioctl_list);
	63	return 0;
	64	}
	65
	66	/*
	67	* Deregister ioctl with number no.
	68	*/
	69	int
	70	dasd_ioctl_no_unregister(struct module *owner, int no, dasd_ioctl_fn_t handler)
	71	{
	72	struct dasd_ioctl *old = dasd_find_ioctl(no);
	73	if (old == NULL)
	74	return -ENOENT;
	75	if (old->no != no \|\| old->handler != handler \|\| owner != old->owner)
76	return -EINVAL;
77	list_del(&old->list);
78	kfree(old);
79	return 0;
80	}
81
82	int
83	dasd_ioctl(struct inode inp, struct file filp,
84	unsigned int no, unsigned long data)
85	{
86	struct block_device *bdev = inp->i_bdev;
87	struct dasd_device *device = bdev->bd_disk->private_data;
88	struct dasd_ioctl *ioctl;
89	const char *dir;
90	int rc;
91
92	if ((_IOC_DIR(no) != _IOC_NONE) && (data == 0)) {
93	PRINT_DEBUG("empty data ptr");
94	return -EINVAL;
95	}
96	dir = _IOC_DIR (no) == _IOC_NONE ? "0" :
97	_IOC_DIR (no) == _IOC_READ ? "r" :
98	_IOC_DIR (no) == _IOC_WRITE ? "w" :
99	_IOC_DIR (no) == (_IOC_READ \| _IOC_WRITE) ? "rw" : "u";
100	DBF_DEV_EVENT(DBF_DEBUG, device,
101	"ioctl 0x%08x %s'0x%x'%d(%d) with data %8lx", no,
102	dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
103	/* Search for ioctl no in the ioctl list. */
104	list_for_each_entry(ioctl, &dasd_ioctl_list, list) {
105	if (ioctl->no == no) {
106	/* Found a matching ioctl. Call it. */
107	if (!try_module_get(ioctl->owner))
108	continue;
109	rc = ioctl->handler(bdev, no, data);
110	module_put(ioctl->owner);
111	return rc;
112	}
113	}
114	/* No ioctl with number no. */
115	DBF_DEV_EVENT(DBF_INFO, device,
116	"unknown ioctl 0x%08x=%s'0x%x'%d(%d) data %8lx", no,
117	dir, _IOC_TYPE(no), _IOC_NR(no), _IOC_SIZE(no), data);
118	return -EINVAL;
119	}
120
121	static int
122	dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
123	{
124	int ver = DASD_API_VERSION;
125	return put_user(ver, (int __user *) args);
126	}
127
128	/*
129	* Enable device.
130	* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
131	*/
132	static int
133	dasd_ioctl_enable(struct block_device *bdev, int no, long args)
134	{
135	struct dasd_device *device;
136
137	if (!capable(CAP_SYS_ADMIN))
138	return -EACCES;
139	device = bdev->bd_disk->private_data;
140	if (device == NULL)
141	return -ENODEV;
142	dasd_enable_device(device);
143	/* Formatting the dasd device can change the capacity. */
144	down(&bdev->bd_sem);
145	i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
146	up(&bdev->bd_sem);
147	return 0;
148	}
149
150	/*
151	* Disable device.
152	* Used by dasdfmt. Disable I/O operations but allow ioctls.
153	*/
154	static int
155	dasd_ioctl_disable(struct block_device *bdev, int no, long args)
156	{
157	struct dasd_device *device;
158
159	if (!capable(CAP_SYS_ADMIN))
160	return -EACCES;
161	device = bdev->bd_disk->private_data;
162	if (device == NULL)
163	return -ENODEV;
164	/*
165	* Man this is sick. We don't do a real disable but only downgrade
166	* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
167	* BIODASDDISABLE to disable accesses to the device via the block
168	* device layer but it still wants to do i/o on the device by
169	* using the BIODASDFMT ioctl. Therefore the correct state for the
170	* device is DASD_STATE_BASIC that allows to do basic i/o.
171	*/
172	dasd_set_target_state(device, DASD_STATE_BASIC);
173	/*
174	* Set i_size to zero, since read, write, etc. check against this
175	* value.
176	*/
177	down(&bdev->bd_sem);
178	i_size_write(bdev->bd_inode, 0);
179	up(&bdev->bd_sem);
180	return 0;
181	}
182
183	/*
184	* Quiesce device.
185	*/
186	static int
187	dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
188	{
189	struct dasd_device *device;
190	unsigned long flags;
191
192	if (!capable (CAP_SYS_ADMIN))
193	return -EACCES;
194
195	device = bdev->bd_disk->private_data;
196	if (device == NULL)
197	return -ENODEV;
198
199	DEV_MESSAGE (KERN_DEBUG, device, "%s",
200	"Quiesce IO on device");
201	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
202	device->stopped \|= DASD_STOPPED_QUIESCE;
203	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
204	return 0;
205	}
206
207
208	/*
209	* Quiesce device.
210	*/
211	static int
212	dasd_ioctl_resume(struct block_device *bdev, int no, long args)
213	{
214	struct dasd_device *device;
215	unsigned long flags;
216
217	if (!capable (CAP_SYS_ADMIN))
218	return -EACCES;
219
220	device = bdev->bd_disk->private_data;
221	if (device == NULL)
222	return -ENODEV;
223
224	DEV_MESSAGE (KERN_DEBUG, device, "%s",
225	"resume IO on device");
226
227	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
228	device->stopped &= ~DASD_STOPPED_QUIESCE;
229	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
230
231	dasd_schedule_bh (device);
232	return 0;
233	}
234
235	/*
236	* performs formatting of _device_ according to _fdata_
237	* Note: The discipline's format_function is assumed to deliver formatting
238	* commands to format a single unit of the device. In terms of the ECKD
239	* devices this means CCWs are generated to format a single track.
240	*/
241	static int
242	dasd_format(struct dasd_device * device, struct format_data_t * fdata)
243	{
244	struct dasd_ccw_req *cqr;
245	int rc;
246
247	if (device->discipline->format_device == NULL)
248	return -EPERM;
249
250	if (device->state != DASD_STATE_BASIC) {
251	DEV_MESSAGE(KERN_WARNING, device, "%s",
252	"dasd_format: device is not disabled! ");
253	return -EBUSY;
254	}
255
256	DBF_DEV_EVENT(DBF_NOTICE, device,
257	"formatting units %d to %d (%d B blocks) flags %d",
258	fdata->start_unit,
259	fdata->stop_unit, fdata->blksize, fdata->intensity);
260
261	/* Since dasdfmt keeps the device open after it was disabled,
262	* there still exists an inode for this device.
263	* We must update i_blkbits, otherwise we might get errors when
264	* enabling the device later.
265	*/
266	if (fdata->start_unit == 0) {
267	struct block_device *bdev = bdget_disk(device->gdp, 0);
268	bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
269	bdput(bdev);
270	}
271
272	while (fdata->start_unit <= fdata->stop_unit) {
273	cqr = device->discipline->format_device(device, fdata);
274	if (IS_ERR(cqr))
275	return PTR_ERR(cqr);
276	rc = dasd_sleep_on_interruptible(cqr);
277	dasd_sfree_request(cqr, cqr->device);
278	if (rc) {
279	if (rc != -ERESTARTSYS)
280	DEV_MESSAGE(KERN_ERR, device,
281	" Formatting of unit %d failed "
282	"with rc = %d",
283	fdata->start_unit, rc);
284	return rc;
285	}
286	fdata->start_unit++;
287	}
288	return 0;
289	}
290
291	/*
292	* Format device.
293	*/
294	static int
295	dasd_ioctl_format(struct block_device *bdev, int no, long args)
296	{
297	struct dasd_device *device;
298	struct format_data_t fdata;
299
300	if (!capable(CAP_SYS_ADMIN))
301	return -EACCES;
302	if (!args)
303	return -EINVAL;
304	/* fdata == NULL is no longer a valid arg to dasd_format ! */
305	device = bdev->bd_disk->private_data;
306
307	if (device == NULL)
308	return -ENODEV;
f24acd45	309
c6eb7b77	310	if (device->features & DASD_FEATURE_READONLY)
1da177e4 LT	311	return -EROFS;
	312	if (copy_from_user(&fdata, (void __user *) args,
	313	sizeof (struct format_data_t)))
	314	return -EFAULT;
	315	if (bdev != bdev->bd_contains) {
	316	DEV_MESSAGE(KERN_WARNING, device, "%s",
	317	"Cannot low-level format a partition");
	318	return -EINVAL;
	319	}
	320	return dasd_format(device, &fdata);
	321	}
	322
	323	#ifdef CONFIG_DASD_PROFILE
	324	/*
	325	* Reset device profile information
	326	*/
	327	static int
	328	dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
	329	{
	330	struct dasd_device *device;
	331
	332	if (!capable(CAP_SYS_ADMIN))
	333	return -EACCES;
	334
	335	device = bdev->bd_disk->private_data;
	336	if (device == NULL)
	337	return -ENODEV;
	338
	339	memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
	340	return 0;
	341	}
	342
	343	/*
	344	* Return device profile information
	345	*/
	346	static int
	347	dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
	348	{
	349	struct dasd_device *device;
	350
	351	device = bdev->bd_disk->private_data;
	352	if (device == NULL)
	353	return -ENODEV;
	354
9a7af289 HH	355	if (dasd_profile_level == DASD_PROFILE_OFF)
	356	return -EIO;
	357
1da177e4 LT	358	if (copy_to_user((long __user ) args, (long ) &device->profile,
	359	sizeof (struct dasd_profile_info_t)))
	360	return -EFAULT;
	361	return 0;
	362	}
	363	#else
	364	static int
	365	dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
	366	{
	367	return -ENOSYS;
	368	}
	369
	370	static int
	371	dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
	372	{
	373	return -ENOSYS;
	374	}
	375	#endif
	376
	377	/*
	378	* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
	379	*/
	380	static int
	381	dasd_ioctl_information(struct block_device *bdev, int no, long args)
	382	{
	383	struct dasd_device *device;
	384	struct dasd_information2_t *dasd_info;
	385	unsigned long flags;
c6eb7b77	386	int rc;
1da177e4 LT	387	struct ccw_device *cdev;
	388
	389	device = bdev->bd_disk->private_data;
	390	if (device == NULL)
	391	return -ENODEV;
	392
	393	if (!device->discipline->fill_info)
	394	return -EINVAL;
	395
	396	dasd_info = kmalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
	397	if (dasd_info == NULL)
	398	return -ENOMEM;
	399
	400	rc = device->discipline->fill_info(device, dasd_info);
	401	if (rc) {
	402	kfree(dasd_info);
	403	return rc;
	404	}
	405
	406	cdev = device->cdev;
	407
	408	dasd_info->devno = _ccw_device_get_device_number(device->cdev);
	409	dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev);
	410	dasd_info->cu_type = cdev->id.cu_type;
	411	dasd_info->cu_model = cdev->id.cu_model;
	412	dasd_info->dev_type = cdev->id.dev_type;
	413	dasd_info->dev_model = cdev->id.dev_model;
	414	dasd_info->open_count = atomic_read(&device->open_count);
	415	dasd_info->status = device->state;
	416
	417	/*
	418	* check if device is really formatted
	419	* LDL / CDL was returned by 'fill_info'
	420	*/
	421	if ((device->state < DASD_STATE_READY) \|\|
	422	(dasd_check_blocksize(device->bp_block)))
	423	dasd_info->format = DASD_FORMAT_NONE;
f24acd45	424
c6eb7b77 HH	425	dasd_info->features \|=
c6eb7b77 HH	426	((device->features & DASD_FEATURE_READONLY) != 0);
1da177e4 LT	427
	428	if (device->discipline)
	429	memcpy(dasd_info->type, device->discipline->name, 4);
	430	else
	431	memcpy(dasd_info->type, "none", 4);
	432	dasd_info->req_queue_len = 0;
	433	dasd_info->chanq_len = 0;
	434	if (device->request_queue->request_fn) {
	435	struct list_head *l;
	436	#ifdef DASD_EXTENDED_PROFILING
	437	{
	438	struct list_head *l;
	439	spin_lock_irqsave(&device->lock, flags);
	440	list_for_each(l, &device->request_queue->queue_head)
	441	dasd_info->req_queue_len++;
	442	spin_unlock_irqrestore(&device->lock, flags);
	443	}
	444	#endif /* DASD_EXTENDED_PROFILING */
	445	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	446	list_for_each(l, &device->ccw_queue)
	447	dasd_info->chanq_len++;
	448	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
	449	flags);
	450	}
	451
	452	rc = 0;
	453	if (copy_to_user((long __user ) args, (long ) dasd_info,
	454	((no == (unsigned int) BIODASDINFO2) ?
	455	sizeof (struct dasd_information2_t) :
	456	sizeof (struct dasd_information_t))))
	457	rc = -EFAULT;
	458	kfree(dasd_info);
	459	return rc;
	460	}
	461
	462	/*
	463	* Set read only
	464	*/
	465	static int
	466	dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
	467	{
	468	struct dasd_device *device;
f24acd45	469	int intval, rc;
1da177e4 LT	470
	471	if (!capable(CAP_SYS_ADMIN))
	472	return -EACCES;
	473	if (bdev != bdev->bd_contains)
	474	// ro setting is not allowed for partitions
	475	return -EINVAL;
	476	if (get_user(intval, (int __user *) args))
	477	return -EFAULT;
	478	device = bdev->bd_disk->private_data;
	479	if (device == NULL)
	480	return -ENODEV;
f24acd45	481
1da177e4	482	set_disk_ro(bdev->bd_disk, intval);
f24acd45 HH	483	rc = dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
	484
	485	return rc;
1da177e4 LT	486	}
1da177e4 LT	487
1da177e4 LT	488	/*
	489	* List of static ioctls.
	490	*/
	491	static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
	492	{
	493	{ BIODASDDISABLE, dasd_ioctl_disable },
	494	{ BIODASDENABLE, dasd_ioctl_enable },
	495	{ BIODASDQUIESCE, dasd_ioctl_quiesce },
	496	{ BIODASDRESUME, dasd_ioctl_resume },
	497	{ BIODASDFMT, dasd_ioctl_format },
	498	{ BIODASDINFO, dasd_ioctl_information },
	499	{ BIODASDINFO2, dasd_ioctl_information },
	500	{ BIODASDPRRD, dasd_ioctl_read_profile },
	501	{ BIODASDPRRST, dasd_ioctl_reset_profile },
	502	{ BLKROSET, dasd_ioctl_set_ro },
	503	{ DASDAPIVER, dasd_ioctl_api_version },
1da177e4 LT	504	{ -1, NULL }
	505	};
	506
	507	int
	508	dasd_ioctl_init(void)
	509	{
	510	int i;
	511
	512	for (i = 0; dasd_ioctls[i].no != -1; i++)
	513	dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
	514	dasd_ioctls[i].fn);
	515	return 0;
	516
	517	}
	518
	519	void
	520	dasd_ioctl_exit(void)
	521	{
	522	int i;
	523
	524	for (i = 0; dasd_ioctls[i].no != -1; i++)
	525	dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
	526	dasd_ioctls[i].fn);
	527
	528	}
	529
	530	EXPORT_SYMBOL(dasd_ioctl_no_register);
	531	EXPORT_SYMBOL(dasd_ioctl_no_unregister);