[deliverable/linux.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
 *
 * 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/cmb.h>
#include <asm/uaccess.h>

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

#include "dasd_int.h"


static int
dasd_ioctl_api_version(void __user *argp)
{
	int ver = DASD_API_VERSION;
	return put_user(ver, (int __user *)argp);
}

/*
 * Enable device.
 * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
 */
static int
dasd_ioctl_enable(struct block_device *bdev)
{
	struct dasd_device *device = bdev->bd_disk->private_data;

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

	dasd_enable_device(device);
	/* Formatting the dasd device can change the capacity. */
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
	mutex_unlock(&bdev->bd_mutex);
	return 0;
}

/*
 * Disable device.
 * Used by dasdfmt. Disable I/O operations but allow ioctls.
 */
static int
dasd_ioctl_disable(struct block_device *bdev)
{
	struct dasd_device *device = bdev->bd_disk->private_data;

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

	/*
	 * 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.
	 */
	mutex_lock(&bdev->bd_mutex);
	i_size_write(bdev->bd_inode, 0);
	mutex_unlock(&bdev->bd_mutex);
	return 0;
}

/*
 * Quiesce device.
 */
static int
dasd_ioctl_quiesce(struct dasd_device *device)
{
	unsigned long flags;
	
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;
	
	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 dasd_device *device)
{
	unsigned long flags;
	
	if (!capable (CAP_SYS_ADMIN)) 
		return -EACCES;

	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, void __user *argp)
{
	struct dasd_device *device = bdev->bd_disk->private_data;
	struct format_data_t fdata;

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

	if (device->features & DASD_FEATURE_READONLY)
		return -EROFS;
	if (copy_from_user(&fdata, argp, 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 dasd_device *device)
{
	memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
	return 0;
}

/*
 * Return device profile information
 */
static int
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
	if (dasd_profile_level == DASD_PROFILE_OFF)
		return -EIO;
	if (copy_to_user(argp, &device->profile,
			 sizeof (struct dasd_profile_info_t)))
		return -EFAULT;
	return 0;
}
#else
static int
dasd_ioctl_reset_profile(struct dasd_device *device)
{
	return -ENOSYS;
}

static int
dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
{
	return -ENOSYS;
}
#endif

/*
 * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
 */
static int
dasd_ioctl_information(struct dasd_device *device,
		unsigned int cmd, void __user *argp)
{
	struct dasd_information2_t *dasd_info;
	unsigned long flags;
	int rc;
	struct ccw_device *cdev;

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

	dasd_info = kzalloc(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->status = device->state;
	/*
	 * The open_count is increased for every opener, that includes
	 * the blkdev_get in dasd_scan_partitions.
	 * This must be hidden from user-space.
	 */
	dasd_info->open_count = atomic_read(&device->open_count);
	if (!device->bdev)
		dasd_info->open_count++;
	
	/*
	 * 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);

	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(argp, dasd_info,
			 ((cmd == (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, void __user *argp)
{
	struct dasd_device *device =  bdev->bd_disk->private_data;
	int intval;

	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 *)argp))
		return -EFAULT;

	set_disk_ro(bdev->bd_disk, intval);
	return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
}

static int
dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd,
		unsigned long arg)
{
	struct cmbdata __user *argp = (void __user *) arg;
	size_t size = _IOC_SIZE(cmd);
	struct cmbdata data;
	int ret;

	ret = cmf_readall(device->cdev, &data);
	if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
		return -EFAULT;
	return ret;
}

int
dasd_ioctl(struct inode *inode, struct file *file,
	   unsigned int cmd, unsigned long arg)
{
	struct block_device *bdev = inode->i_bdev;
	struct dasd_device *device = bdev->bd_disk->private_data;
	void __user *argp = (void __user *)arg;

	if (!device)
                return -ENODEV;

	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
		PRINT_DEBUG("empty data ptr");
		return -EINVAL;
	}

	switch (cmd) {
	case BIODASDDISABLE:
		return dasd_ioctl_disable(bdev);
	case BIODASDENABLE:
		return dasd_ioctl_enable(bdev);
	case BIODASDQUIESCE:
		return dasd_ioctl_quiesce(device);
	case BIODASDRESUME:
		return dasd_ioctl_resume(device);
	case BIODASDFMT:
		return dasd_ioctl_format(bdev, argp);
	case BIODASDINFO:
		return dasd_ioctl_information(device, cmd, argp);
	case BIODASDINFO2:
		return dasd_ioctl_information(device, cmd, argp);
	case BIODASDPRRD:
		return dasd_ioctl_read_profile(device, argp);
	case BIODASDPRRST:
		return dasd_ioctl_reset_profile(device);
	case BLKROSET:
		return dasd_ioctl_set_ro(bdev, argp);
	case DASDAPIVER:
		return dasd_ioctl_api_version(argp);
	case BIODASDCMFENABLE:
		return enable_cmf(device->cdev);
	case BIODASDCMFDISABLE:
		return disable_cmf(device->cdev);
	case BIODASDREADALLCMB:
		return dasd_ioctl_readall_cmb(device, cmd, arg);
	default:
		/* if the discipline has an ioctl method try it. */
		if (device->discipline->ioctl) {
			int rval = device->discipline->ioctl(device, cmd, argp);
			if (rval != -ENOIOCTLCMD)
				return rval;
		}

		return -EINVAL;
	}
}

long
dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
{
	int rval;

	lock_kernel();
	rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
	unlock_kernel();

	return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
}
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	*
	10	* i/o controls for the dasd driver.
	11	*/
	12	#include <linux/config.h>
	13	#include <linux/interrupt.h>
	14	#include <linux/major.h>
	15	#include <linux/fs.h>
	16	#include <linux/blkpg.h>
	17
	18	#include <asm/ccwdev.h>
8b2eb664	19	#include <asm/cmb.h>
1da177e4 LT	20	#include <asm/uaccess.h>
	21
	22	/* This is ugly... */
	23	#define PRINTK_HEADER "dasd_ioctl:"
	24
	25	#include "dasd_int.h"
	26
1da177e4	27
1da177e4	28	static int
13c6204f	29	dasd_ioctl_api_version(void __user *argp)
1da177e4 LT	30	{
1da177e4 LT	31	int ver = DASD_API_VERSION;
b5029622	32	return put_user(ver, (int __user *)argp);
1da177e4 LT	33	}
	34
	35	/*
	36	* Enable device.
	37	* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
	38	*/
	39	static int
13c6204f	40	dasd_ioctl_enable(struct block_device *bdev)
1da177e4	41	{
13c6204f	42	struct dasd_device *device = bdev->bd_disk->private_data;
1da177e4 LT	43
	44	if (!capable(CAP_SYS_ADMIN))
	45	return -EACCES;
13c6204f	46
1da177e4 LT	47	dasd_enable_device(device);
1da177e4 LT	48	/* Formatting the dasd device can change the capacity. */
c039e313	49	mutex_lock(&bdev->bd_mutex);
1da177e4	50	i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
c039e313	51	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	52	return 0;
	53	}
	54
	55	/*
	56	* Disable device.
	57	* Used by dasdfmt. Disable I/O operations but allow ioctls.
	58	*/
	59	static int
13c6204f	60	dasd_ioctl_disable(struct block_device *bdev)
1da177e4	61	{
13c6204f	62	struct dasd_device *device = bdev->bd_disk->private_data;
1da177e4 LT	63
	64	if (!capable(CAP_SYS_ADMIN))
	65	return -EACCES;
13c6204f	66
1da177e4 LT	67	/*
	68	* Man this is sick. We don't do a real disable but only downgrade
	69	* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
	70	* BIODASDDISABLE to disable accesses to the device via the block
	71	* device layer but it still wants to do i/o on the device by
	72	* using the BIODASDFMT ioctl. Therefore the correct state for the
	73	* device is DASD_STATE_BASIC that allows to do basic i/o.
	74	*/
	75	dasd_set_target_state(device, DASD_STATE_BASIC);
	76	/*
	77	* Set i_size to zero, since read, write, etc. check against this
	78	* value.
	79	*/
c039e313	80	mutex_lock(&bdev->bd_mutex);
1da177e4	81	i_size_write(bdev->bd_inode, 0);
c039e313	82	mutex_unlock(&bdev->bd_mutex);
1da177e4 LT	83	return 0;
	84	}
	85
	86	/*
	87	* Quiesce device.
	88	*/
	89	static int
13c6204f	90	dasd_ioctl_quiesce(struct dasd_device *device)
1da177e4	91	{
1da177e4 LT	92	unsigned long flags;
	93
	94	if (!capable (CAP_SYS_ADMIN))
	95	return -EACCES;
	96
1da177e4 LT	97	DEV_MESSAGE (KERN_DEBUG, device, "%s",
	98	"Quiesce IO on device");
	99	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	100	device->stopped \|= DASD_STOPPED_QUIESCE;
	101	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
	102	return 0;
	103	}
	104
	105
	106	/*
	107	* Quiesce device.
	108	*/
	109	static int
13c6204f	110	dasd_ioctl_resume(struct dasd_device *device)
1da177e4	111	{
1da177e4 LT	112	unsigned long flags;
	113
	114	if (!capable (CAP_SYS_ADMIN))
	115	return -EACCES;
	116
1da177e4 LT	117	DEV_MESSAGE (KERN_DEBUG, device, "%s",
	118	"resume IO on device");
	119
	120	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	121	device->stopped &= ~DASD_STOPPED_QUIESCE;
	122	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev), flags);
	123
	124	dasd_schedule_bh (device);
	125	return 0;
	126	}
	127
	128	/*
	129	* performs formatting of _device_ according to _fdata_
	130	* Note: The discipline's format_function is assumed to deliver formatting
	131	* commands to format a single unit of the device. In terms of the ECKD
	132	* devices this means CCWs are generated to format a single track.
	133	*/
	134	static int
	135	dasd_format(struct dasd_device * device, struct format_data_t * fdata)
	136	{
	137	struct dasd_ccw_req *cqr;
	138	int rc;
	139
	140	if (device->discipline->format_device == NULL)
	141	return -EPERM;
	142
	143	if (device->state != DASD_STATE_BASIC) {
	144	DEV_MESSAGE(KERN_WARNING, device, "%s",
	145	"dasd_format: device is not disabled! ");
	146	return -EBUSY;
	147	}
	148
	149	DBF_DEV_EVENT(DBF_NOTICE, device,
	150	"formatting units %d to %d (%d B blocks) flags %d",
	151	fdata->start_unit,
	152	fdata->stop_unit, fdata->blksize, fdata->intensity);
	153
	154	/* Since dasdfmt keeps the device open after it was disabled,
	155	* there still exists an inode for this device.
	156	* We must update i_blkbits, otherwise we might get errors when
	157	* enabling the device later.
	158	*/
	159	if (fdata->start_unit == 0) {
	160	struct block_device *bdev = bdget_disk(device->gdp, 0);
	161	bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
	162	bdput(bdev);
	163	}
	164
	165	while (fdata->start_unit <= fdata->stop_unit) {
	166	cqr = device->discipline->format_device(device, fdata);
	167	if (IS_ERR(cqr))
	168	return PTR_ERR(cqr);
	169	rc = dasd_sleep_on_interruptible(cqr);
	170	dasd_sfree_request(cqr, cqr->device);
	171	if (rc) {
	172	if (rc != -ERESTARTSYS)
	173	DEV_MESSAGE(KERN_ERR, device,
	174	" Formatting of unit %d failed "
	175	"with rc = %d",
	176	fdata->start_unit, rc);
	177	return rc;
	178	}
	179	fdata->start_unit++;
	180	}
181	return 0;
182	}
183
184	/*
185	* Format device.
186	*/
187	static int
13c6204f	188	dasd_ioctl_format(struct block_device bdev, void __user argp)
1da177e4	189	{
13c6204f	190	struct dasd_device *device = bdev->bd_disk->private_data;
1da177e4 LT	191	struct format_data_t fdata;
	192
	193	if (!capable(CAP_SYS_ADMIN))
	194	return -EACCES;
13c6204f	195	if (!argp)
1da177e4	196	return -EINVAL;
f24acd45	197
c6eb7b77	198	if (device->features & DASD_FEATURE_READONLY)
1da177e4	199	return -EROFS;
13c6204f	200	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
1da177e4 LT	201	return -EFAULT;
	202	if (bdev != bdev->bd_contains) {
	203	DEV_MESSAGE(KERN_WARNING, device, "%s",
	204	"Cannot low-level format a partition");
	205	return -EINVAL;
	206	}
	207	return dasd_format(device, &fdata);
	208	}
	209
	210	#ifdef CONFIG_DASD_PROFILE
	211	/*
	212	* Reset device profile information
	213	*/
	214	static int
13c6204f	215	dasd_ioctl_reset_profile(struct dasd_device *device)
1da177e4	216	{
1da177e4 LT	217	memset(&device->profile, 0, sizeof (struct dasd_profile_info_t));
	218	return 0;
	219	}
	220
	221	/*
	222	* Return device profile information
	223	*/
	224	static int
13c6204f	225	dasd_ioctl_read_profile(struct dasd_device device, void __user argp)
1da177e4	226	{
9a7af289 HH	227	if (dasd_profile_level == DASD_PROFILE_OFF)
9a7af289 HH	228	return -EIO;
13c6204f	229	if (copy_to_user(argp, &device->profile,
1da177e4 LT	230	sizeof (struct dasd_profile_info_t)))
	231	return -EFAULT;
	232	return 0;
	233	}
	234	#else
	235	static int
13c6204f	236	dasd_ioctl_reset_profile(struct dasd_device *device)
1da177e4 LT	237	{
	238	return -ENOSYS;
	239	}
	240
	241	static int
13c6204f	242	dasd_ioctl_read_profile(struct dasd_device device, void __user argp)
1da177e4 LT	243	{
	244	return -ENOSYS;
	245	}
	246	#endif
	247
	248	/*
	249	* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
	250	*/
	251	static int
13c6204f CH	252	dasd_ioctl_information(struct dasd_device *device,
13c6204f CH	253	unsigned int cmd, void __user *argp)
1da177e4	254	{
1da177e4 LT	255	struct dasd_information2_t *dasd_info;
1da177e4 LT	256	unsigned long flags;
c6eb7b77	257	int rc;
1da177e4 LT	258	struct ccw_device *cdev;
1da177e4 LT	259
1da177e4 LT	260	if (!device->discipline->fill_info)
	261	return -EINVAL;
	262
554a826e	263	dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
1da177e4 LT	264	if (dasd_info == NULL)
	265	return -ENOMEM;
	266
	267	rc = device->discipline->fill_info(device, dasd_info);
	268	if (rc) {
	269	kfree(dasd_info);
	270	return rc;
	271	}
	272
	273	cdev = device->cdev;
	274
	275	dasd_info->devno = _ccw_device_get_device_number(device->cdev);
	276	dasd_info->schid = _ccw_device_get_subchannel_number(device->cdev);
	277	dasd_info->cu_type = cdev->id.cu_type;
	278	dasd_info->cu_model = cdev->id.cu_model;
	279	dasd_info->dev_type = cdev->id.dev_type;
	280	dasd_info->dev_model = cdev->id.dev_model;
1da177e4	281	dasd_info->status = device->state;
57467195 HH	282	/*
	283	* The open_count is increased for every opener, that includes
	284	* the blkdev_get in dasd_scan_partitions.
	285	* This must be hidden from user-space.
	286	*/
	287	dasd_info->open_count = atomic_read(&device->open_count);
	288	if (!device->bdev)
	289	dasd_info->open_count++;
1da177e4 LT	290
	291	/*
	292	* check if device is really formatted
	293	* LDL / CDL was returned by 'fill_info'
	294	*/
	295	if ((device->state < DASD_STATE_READY) \|\|
	296	(dasd_check_blocksize(device->bp_block)))
	297	dasd_info->format = DASD_FORMAT_NONE;
f24acd45	298
c6eb7b77 HH	299	dasd_info->features \|=
c6eb7b77 HH	300	((device->features & DASD_FEATURE_READONLY) != 0);
1da177e4 LT	301
	302	if (device->discipline)
	303	memcpy(dasd_info->type, device->discipline->name, 4);
	304	else
	305	memcpy(dasd_info->type, "none", 4);
554a826e	306
1da177e4 LT	307	if (device->request_queue->request_fn) {
	308	struct list_head *l;
	309	#ifdef DASD_EXTENDED_PROFILING
	310	{
	311	struct list_head *l;
	312	spin_lock_irqsave(&device->lock, flags);
	313	list_for_each(l, &device->request_queue->queue_head)
	314	dasd_info->req_queue_len++;
	315	spin_unlock_irqrestore(&device->lock, flags);
	316	}
	317	#endif /* DASD_EXTENDED_PROFILING */
	318	spin_lock_irqsave(get_ccwdev_lock(device->cdev), flags);
	319	list_for_each(l, &device->ccw_queue)
	320	dasd_info->chanq_len++;
	321	spin_unlock_irqrestore(get_ccwdev_lock(device->cdev),
	322	flags);
	323	}
	324
	325	rc = 0;
13c6204f CH	326	if (copy_to_user(argp, dasd_info,
13c6204f CH	327	((cmd == (unsigned int) BIODASDINFO2) ?
1da177e4 LT	328	sizeof (struct dasd_information2_t) :
	329	sizeof (struct dasd_information_t))))
	330	rc = -EFAULT;
	331	kfree(dasd_info);
	332	return rc;
	333	}
	334
	335	/*
	336	* Set read only
	337	*/
	338	static int
13c6204f	339	dasd_ioctl_set_ro(struct block_device bdev, void __user argp)
1da177e4	340	{
13c6204f CH	341	struct dasd_device *device = bdev->bd_disk->private_data;
13c6204f CH	342	int intval;
1da177e4 LT	343
	344	if (!capable(CAP_SYS_ADMIN))
	345	return -EACCES;
	346	if (bdev != bdev->bd_contains)
	347	// ro setting is not allowed for partitions
	348	return -EINVAL;
13c6204f	349	if (get_user(intval, (int *)argp))
1da177e4	350	return -EFAULT;
f24acd45	351
1da177e4	352	set_disk_ro(bdev->bd_disk, intval);
13c6204f	353	return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
1da177e4 LT	354	}
1da177e4 LT	355
8b2eb664 CH	356	static int
	357	dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd,
	358	unsigned long arg)
	359	{
	360	struct cmbdata __user argp = (void __user ) arg;
	361	size_t size = _IOC_SIZE(cmd);
	362	struct cmbdata data;
	363	int ret;
	364
	365	ret = cmf_readall(device->cdev, &data);
	366	if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
	367	return -EFAULT;
	368	return ret;
	369	}
	370
1da177e4	371	int
13c6204f CH	372	dasd_ioctl(struct inode inode, struct file file,
13c6204f CH	373	unsigned int cmd, unsigned long arg)
1da177e4	374	{
13c6204f CH	375	struct block_device *bdev = inode->i_bdev;
	376	struct dasd_device *device = bdev->bd_disk->private_data;
	377	void __user argp = (void __user )arg;
1da177e4	378
13c6204f CH	379	if (!device)
	380	return -ENODEV;
	381
	382	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
	383	PRINT_DEBUG("empty data ptr");
	384	return -EINVAL;
	385	}
1da177e4	386
13c6204f CH	387	switch (cmd) {
	388	case BIODASDDISABLE:
	389	return dasd_ioctl_disable(bdev);
	390	case BIODASDENABLE:
	391	return dasd_ioctl_enable(bdev);
	392	case BIODASDQUIESCE:
	393	return dasd_ioctl_quiesce(device);
	394	case BIODASDRESUME:
	395	return dasd_ioctl_resume(device);
	396	case BIODASDFMT:
	397	return dasd_ioctl_format(bdev, argp);
	398	case BIODASDINFO:
	399	return dasd_ioctl_information(device, cmd, argp);
	400	case BIODASDINFO2:
	401	return dasd_ioctl_information(device, cmd, argp);
	402	case BIODASDPRRD:
	403	return dasd_ioctl_read_profile(device, argp);
	404	case BIODASDPRRST:
	405	return dasd_ioctl_reset_profile(device);
	406	case BLKROSET:
	407	return dasd_ioctl_set_ro(bdev, argp);
	408	case DASDAPIVER:
	409	return dasd_ioctl_api_version(argp);
8b2eb664 CH	410	case BIODASDCMFENABLE:
	411	return enable_cmf(device->cdev);
	412	case BIODASDCMFDISABLE:
	413	return disable_cmf(device->cdev);
	414	case BIODASDREADALLCMB:
	415	return dasd_ioctl_readall_cmb(device, cmd, arg);
13c6204f	416	default:
1107ccfb CH	417	/* if the discipline has an ioctl method try it. */
	418	if (device->discipline->ioctl) {
	419	int rval = device->discipline->ioctl(device, cmd, argp);
	420	if (rval != -ENOIOCTLCMD)
	421	return rval;
	422	}
	423
13c6204f CH	424	return -EINVAL;
13c6204f CH	425	}
1da177e4 LT	426	}
1da177e4 LT	427
13c6204f CH	428	long
13c6204f CH	429	dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
1da177e4	430	{
13c6204f	431	int rval;
1da177e4	432
13c6204f CH	433	lock_kernel();
	434	rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
	435	unlock_kernel();
1da177e4	436
13c6204f	437	return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
1da177e4	438	}