[mirror_ubuntu-bionic-kernel.git] / 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>
 * Copyright IBM Corp. 1999, 2001
 *
 * i/o controls for the dasd driver.
 */

#define KMSG_COMPONENT "dasd"

#include <linux/interrupt.h>
#include <linux/compat.h>
#include <linux/major.h>
#include <linux/fs.h>
#include <linux/blkpg.h>
#include <linux/slab.h>
#include <asm/compat.h>
#include <asm/ccwdev.h>
#include <asm/schid.h>
#include <asm/cmb.h>
#include <linux/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 *base;

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

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;

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

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

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		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(base, 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);
	dasd_put_device(base);
	return 0;
}

/*
 * Quiesce device.
 */
static int dasd_ioctl_quiesce(struct dasd_block *block)
{
	unsigned long flags;
	struct dasd_device *base;

	base = block->base;
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;

	pr_info("%s: The DASD has been put in the quiesce "
		"state\n", dev_name(&base->cdev->dev));
	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
	dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
	return 0;
}


/*
 * Resume device.
 */
static int dasd_ioctl_resume(struct dasd_block *block)
{
	unsigned long flags;
	struct dasd_device *base;

	base = block->base;
	if (!capable (CAP_SYS_ADMIN))
		return -EACCES;

	pr_info("%s: I/O operations have been resumed "
		"on the DASD\n", dev_name(&base->cdev->dev));
	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
	dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);

	dasd_schedule_block_bh(block);
	return 0;
}

/*
 * Abort all failfast I/O on a device.
 */
static int dasd_ioctl_abortio(struct dasd_block *block)
{
	unsigned long flags;
	struct dasd_device *base;
	struct dasd_ccw_req *cqr, *n;

	base = block->base;
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
		return 0;
	DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");

	spin_lock_irqsave(&block->request_queue_lock, flags);
	spin_lock(&block->queue_lock);
	list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
		if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
		    cqr->callback_data &&
		    cqr->callback_data != DASD_SLEEPON_START_TAG &&
		    cqr->callback_data != DASD_SLEEPON_END_TAG) {
			spin_unlock(&block->queue_lock);
			blk_abort_request(cqr->callback_data);
			spin_lock(&block->queue_lock);
		}
	}
	spin_unlock(&block->queue_lock);
	spin_unlock_irqrestore(&block->request_queue_lock, flags);

	dasd_schedule_block_bh(block);
	return 0;
}

/*
 * Allow I/O on a device
 */
static int dasd_ioctl_allowio(struct dasd_block *block)
{
	struct dasd_device *base;

	base = block->base;
	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
		DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");

	return 0;
}

/*
 * performs formatting of _device_ according to _fdata_
 * Note: The discipline's format_function is assumed to deliver formatting
 * commands to format multiple units of the device. In terms of the ECKD
 * devices this means CCWs are generated to format multiple tracks.
 */
static int
dasd_format(struct dasd_block *block, struct format_data_t *fdata)
{
	struct dasd_device *base;
	int rc;

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

	if (base->state != DASD_STATE_BASIC) {
		pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
			dev_name(&base->cdev->dev));
		return -EBUSY;
	}

	DBF_DEV_EVENT(DBF_NOTICE, base,
		      "formatting units %u to %u (%u B blocks) flags %u",
		      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(block->gdp, 0);
		bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
		bdput(bdev);
	}

	rc = base->discipline->format_device(base, fdata, 1);
	if (rc == -EAGAIN)
		rc = base->discipline->format_device(base, fdata, 0);

	return rc;
}

static int dasd_check_format(struct dasd_block *block,
			     struct format_check_t *cdata)
{
	struct dasd_device *base;
	int rc;

	base = block->base;
	if (!base->discipline->check_device_format)
		return -ENOTTY;

	rc = base->discipline->check_device_format(base, cdata, 1);
	if (rc == -EAGAIN)
		rc = base->discipline->check_device_format(base, cdata, 0);

	return rc;
}

/*
 * Format device.
 */
static int
dasd_ioctl_format(struct block_device *bdev, void __user *argp)
{
	struct dasd_device *base;
	struct format_data_t fdata;
	int rc;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;
	if (!argp)
		return -EINVAL;
	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	if (base->features & DASD_FEATURE_READONLY ||
	    test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
		dasd_put_device(base);
		return -EROFS;
	}
	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
		dasd_put_device(base);
		return -EFAULT;
	}
	if (bdev != bdev->bd_contains) {
		pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
			dev_name(&base->cdev->dev));
		dasd_put_device(base);
		return -EINVAL;
	}
	rc = dasd_format(base->block, &fdata);
	dasd_put_device(base);

	return rc;
}

/*
 * Check device format
 */
static int dasd_ioctl_check_format(struct block_device *bdev, void __user *argp)
{
	struct format_check_t cdata;
	struct dasd_device *base;
	int rc = 0;

	if (!argp)
		return -EINVAL;

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	if (bdev != bdev->bd_contains) {
		pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
			dev_name(&base->cdev->dev));
		rc = -EINVAL;
		goto out_err;
	}

	if (copy_from_user(&cdata, argp, sizeof(cdata))) {
		rc = -EFAULT;
		goto out_err;
	}

	rc = dasd_check_format(base->block, &cdata);
	if (rc)
		goto out_err;

	if (copy_to_user(argp, &cdata, sizeof(cdata)))
		rc = -EFAULT;

out_err:
	dasd_put_device(base);

	return rc;
}

#ifdef CONFIG_DASD_PROFILE
/*
 * Reset device profile information
 */
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
	dasd_profile_reset(&block->profile);
	return 0;
}

/*
 * Return device profile information
 */
static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
	struct dasd_profile_info_t *data;
	int rc = 0;

	data = kmalloc(sizeof(*data), GFP_KERNEL);
	if (!data)
		return -ENOMEM;

	spin_lock_bh(&block->profile.lock);
	if (block->profile.data) {
		data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
		data->dasd_io_sects = block->profile.data->dasd_io_sects;
		memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
		       sizeof(data->dasd_io_secs));
		memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
		       sizeof(data->dasd_io_times));
		memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
		       sizeof(data->dasd_io_timps));
		memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
		       sizeof(data->dasd_io_time1));
		memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
		       sizeof(data->dasd_io_time2));
		memcpy(data->dasd_io_time2ps,
		       block->profile.data->dasd_io_time2ps,
		       sizeof(data->dasd_io_time2ps));
		memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
		       sizeof(data->dasd_io_time3));
		memcpy(data->dasd_io_nr_req,
		       block->profile.data->dasd_io_nr_req,
		       sizeof(data->dasd_io_nr_req));
		spin_unlock_bh(&block->profile.lock);
	} else {
		spin_unlock_bh(&block->profile.lock);
		rc = -EIO;
		goto out;
	}
	if (copy_to_user(argp, data, sizeof(*data)))
		rc = -EFAULT;
out:
	kfree(data);
	return rc;
}
#else
static int dasd_ioctl_reset_profile(struct dasd_block *block)
{
	return -ENOTTY;
}

static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
{
	return -ENOTTY;
}
#endif

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

	base = block->base;
	if (!base->discipline || !base->discipline->fill_info)
		return -EINVAL;

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

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

	cdev = base->cdev;
	ccw_device_get_id(cdev, &dev_id);
	ccw_device_get_schid(cdev, &sch_id);

	dasd_info->devno = dev_id.devno;
	dasd_info->schid = sch_id.sch_no;
	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 = base->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(&block->open_count);
	if (!block->bdev)
		dasd_info->open_count++;

	/*
	 * check if device is really formatted
	 * LDL / CDL was returned by 'fill_info'
	 */
	if ((base->state < DASD_STATE_READY) ||
	    (dasd_check_blocksize(block->bp_block)))
		dasd_info->format = DASD_FORMAT_NONE;

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

	memcpy(dasd_info->type, base->discipline->name, 4);

	if (block->request_queue->request_fn) {
		struct list_head *l;
#ifdef DASD_EXTENDED_PROFILING
		{
			struct list_head *l;
			spin_lock_irqsave(&block->lock, flags);
			list_for_each(l, &block->request_queue->queue_head)
				dasd_info->req_queue_len++;
			spin_unlock_irqrestore(&block->lock, flags);
		}
#endif				/* DASD_EXTENDED_PROFILING */
		spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
		list_for_each(l, &base->ccw_queue)
			dasd_info->chanq_len++;
		spin_unlock_irqrestore(get_ccwdev_lock(base->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 *base;
	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 *)argp))
		return -EFAULT;
	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
		dasd_put_device(base);
		return -EROFS;
	}
	set_disk_ro(bdev->bd_disk, intval);
	rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
	dasd_put_device(base);
	return rc;
}

static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
				  struct cmbdata __user *argp)
{
	size_t size = _IOC_SIZE(cmd);
	struct cmbdata data;
	int ret;

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

int dasd_ioctl(struct block_device *bdev, fmode_t mode,
	       unsigned int cmd, unsigned long arg)
{
	struct dasd_block *block;
	struct dasd_device *base;
	void __user *argp;
	int rc;

	if (is_compat_task())
		argp = compat_ptr(arg);
	else
		argp = (void __user *)arg;

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

	base = dasd_device_from_gendisk(bdev->bd_disk);
	if (!base)
		return -ENODEV;
	block = base->block;
	rc = 0;
	switch (cmd) {
	case BIODASDDISABLE:
		rc = dasd_ioctl_disable(bdev);
		break;
	case BIODASDENABLE:
		rc = dasd_ioctl_enable(bdev);
		break;
	case BIODASDQUIESCE:
		rc = dasd_ioctl_quiesce(block);
		break;
	case BIODASDRESUME:
		rc = dasd_ioctl_resume(block);
		break;
	case BIODASDABORTIO:
		rc = dasd_ioctl_abortio(block);
		break;
	case BIODASDALLOWIO:
		rc = dasd_ioctl_allowio(block);
		break;
	case BIODASDFMT:
		rc = dasd_ioctl_format(bdev, argp);
		break;
	case BIODASDCHECKFMT:
		rc = dasd_ioctl_check_format(bdev, argp);
		break;
	case BIODASDINFO:
		rc = dasd_ioctl_information(block, cmd, argp);
		break;
	case BIODASDINFO2:
		rc = dasd_ioctl_information(block, cmd, argp);
		break;
	case BIODASDPRRD:
		rc = dasd_ioctl_read_profile(block, argp);
		break;
	case BIODASDPRRST:
		rc = dasd_ioctl_reset_profile(block);
		break;
	case BLKROSET:
		rc = dasd_ioctl_set_ro(bdev, argp);
		break;
	case DASDAPIVER:
		rc = dasd_ioctl_api_version(argp);
		break;
	case BIODASDCMFENABLE:
		rc = enable_cmf(base->cdev);
		break;
	case BIODASDCMFDISABLE:
		rc = disable_cmf(base->cdev);
		break;
	case BIODASDREADALLCMB:
		rc = dasd_ioctl_readall_cmb(block, cmd, argp);
		break;
	default:
		/* if the discipline has an ioctl method try it. */
		rc = -ENOTTY;
		if (base->discipline->ioctl)
			rc = base->discipline->ioctl(block, cmd, argp);
	}
	dasd_put_device(base);
	return rc;
}
Commit	Line	Data
1da177e4	1	/*
1da177e4 LT	2	* Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
	3	* Horst Hummel <Horst.Hummel@de.ibm.com>
	4	* Carsten Otte <Cotte@de.ibm.com>
	5	* Martin Schwidefsky <schwidefsky@de.ibm.com>
	6	* Bugreports.to..: <Linux390@de.ibm.com>
a53c8fab	7	* Copyright IBM Corp. 1999, 2001
1da177e4 LT	8	*
	9	* i/o controls for the dasd driver.
	10	*/
fc19f381 SH	11
	12	#define KMSG_COMPONENT "dasd"
	13
1da177e4	14	#include <linux/interrupt.h>
048cd4e5	15	#include <linux/compat.h>
1da177e4 LT	16	#include <linux/major.h>
	17	#include <linux/fs.h>
	18	#include <linux/blkpg.h>
5a0e3ad6	19	#include <linux/slab.h>
88034865	20	#include <asm/compat.h>
1da177e4	21	#include <asm/ccwdev.h>
287a0933	22	#include <asm/schid.h>
8b2eb664	23	#include <asm/cmb.h>
7c0f6ba6	24	#include <linux/uaccess.h>
1da177e4 LT	25
	26	/* This is ugly... */
	27	#define PRINTK_HEADER "dasd_ioctl:"
	28
	29	#include "dasd_int.h"
	30
1da177e4	31
1da177e4	32	static int
13c6204f	33	dasd_ioctl_api_version(void __user *argp)
1da177e4 LT	34	{
1da177e4 LT	35	int ver = DASD_API_VERSION;
b5029622	36	return put_user(ver, (int __user *)argp);
1da177e4 LT	37	}
	38
	39	/*
	40	* Enable device.
	41	* used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
	42	*/
	43	static int
13c6204f	44	dasd_ioctl_enable(struct block_device *bdev)
1da177e4	45	{
65f8da47	46	struct dasd_device *base;
1da177e4 LT	47
	48	if (!capable(CAP_SYS_ADMIN))
	49	return -EACCES;
13c6204f	50
65f8da47 SW	51	base = dasd_device_from_gendisk(bdev->bd_disk);
	52	if (!base)
	53	return -ENODEV;
	54
	55	dasd_enable_device(base);
1da177e4	56	/* Formatting the dasd device can change the capacity. */
c039e313	57	mutex_lock(&bdev->bd_mutex);
65f8da47 SW	58	i_size_write(bdev->bd_inode,
65f8da47 SW	59	(loff_t)get_capacity(base->block->gdp) << 9);
c039e313	60	mutex_unlock(&bdev->bd_mutex);
65f8da47	61	dasd_put_device(base);
1da177e4 LT	62	return 0;
	63	}
	64
	65	/*
	66	* Disable device.
	67	* Used by dasdfmt. Disable I/O operations but allow ioctls.
	68	*/
	69	static int
13c6204f	70	dasd_ioctl_disable(struct block_device *bdev)
1da177e4	71	{
65f8da47	72	struct dasd_device *base;
1da177e4 LT	73
	74	if (!capable(CAP_SYS_ADMIN))
	75	return -EACCES;
13c6204f	76
65f8da47 SW	77	base = dasd_device_from_gendisk(bdev->bd_disk);
	78	if (!base)
	79	return -ENODEV;
1da177e4 LT	80	/*
	81	* Man this is sick. We don't do a real disable but only downgrade
	82	* the device to DASD_STATE_BASIC. The reason is that dasdfmt uses
	83	* BIODASDDISABLE to disable accesses to the device via the block
	84	* device layer but it still wants to do i/o on the device by
	85	* using the BIODASDFMT ioctl. Therefore the correct state for the
	86	* device is DASD_STATE_BASIC that allows to do basic i/o.
	87	*/
65f8da47	88	dasd_set_target_state(base, DASD_STATE_BASIC);
1da177e4 LT	89	/*
	90	* Set i_size to zero, since read, write, etc. check against this
	91	* value.
	92	*/
c039e313	93	mutex_lock(&bdev->bd_mutex);
1da177e4	94	i_size_write(bdev->bd_inode, 0);
c039e313	95	mutex_unlock(&bdev->bd_mutex);
65f8da47	96	dasd_put_device(base);
1da177e4 LT	97	return 0;
	98	}
	99
	100	/*
	101	* Quiesce device.
	102	*/
8e09f215	103	static int dasd_ioctl_quiesce(struct dasd_block *block)
1da177e4	104	{
1da177e4	105	unsigned long flags;
8e09f215	106	struct dasd_device *base;
138c014d	107
8e09f215	108	base = block->base;
1da177e4 LT	109	if (!capable (CAP_SYS_ADMIN))
1da177e4 LT	110	return -EACCES;
138c014d	111
ca99dab0 SH	112	pr_info("%s: The DASD has been put in the quiesce "
ca99dab0 SH	113	"state\n", dev_name(&base->cdev->dev));
8e09f215	114	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b	115	dasd_device_set_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215	116	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
1da177e4 LT	117	return 0;
	118	}
	119
	120
	121	/*
fc19f381	122	* Resume device.
1da177e4	123	*/
8e09f215	124	static int dasd_ioctl_resume(struct dasd_block *block)
1da177e4	125	{
1da177e4	126	unsigned long flags;
8e09f215	127	struct dasd_device *base;
138c014d	128
8e09f215	129	base = block->base;
138c014d	130	if (!capable (CAP_SYS_ADMIN))
1da177e4 LT	131	return -EACCES;
1da177e4 LT	132
ca99dab0 SH	133	pr_info("%s: I/O operations have been resumed "
ca99dab0 SH	134	"on the DASD\n", dev_name(&base->cdev->dev));
8e09f215	135	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
eb6e199b	136	dasd_device_remove_stop_bits(base, DASD_STOPPED_QUIESCE);
8e09f215	137	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
1da177e4	138
8e09f215	139	dasd_schedule_block_bh(block);
1da177e4 LT	140	return 0;
	141	}
	142
5ea34a01 HR	143	/*
	144	* Abort all failfast I/O on a device.
	145	*/
	146	static int dasd_ioctl_abortio(struct dasd_block *block)
	147	{
	148	unsigned long flags;
	149	struct dasd_device *base;
	150	struct dasd_ccw_req cqr, n;
	151
	152	base = block->base;
	153	if (!capable(CAP_SYS_ADMIN))
	154	return -EACCES;
	155
	156	if (test_and_set_bit(DASD_FLAG_ABORTALL, &base->flags))
	157	return 0;
	158	DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag set");
	159
	160	spin_lock_irqsave(&block->request_queue_lock, flags);
	161	spin_lock(&block->queue_lock);
	162	list_for_each_entry_safe(cqr, n, &block->ccw_queue, blocklist) {
	163	if (test_bit(DASD_CQR_FLAGS_FAILFAST, &cqr->flags) &&
	164	cqr->callback_data &&
	165	cqr->callback_data != DASD_SLEEPON_START_TAG &&
	166	cqr->callback_data != DASD_SLEEPON_END_TAG) {
	167	spin_unlock(&block->queue_lock);
	168	blk_abort_request(cqr->callback_data);
	169	spin_lock(&block->queue_lock);
	170	}
	171	}
	172	spin_unlock(&block->queue_lock);
	173	spin_unlock_irqrestore(&block->request_queue_lock, flags);
	174
	175	dasd_schedule_block_bh(block);
	176	return 0;
	177	}
	178
	179	/*
	180	* Allow I/O on a device
	181	*/
	182	static int dasd_ioctl_allowio(struct dasd_block *block)
	183	{
	184	struct dasd_device *base;
	185
	186	base = block->base;
	187	if (!capable(CAP_SYS_ADMIN))
	188	return -EACCES;
	189
	190	if (test_and_clear_bit(DASD_FLAG_ABORTALL, &base->flags))
	191	DBF_DEV_EVENT(DBF_NOTICE, base, "%s", "abortall flag unset");
	192
	193	return 0;
	194	}
	195
1da177e4 LT	196	/*
	197	* performs formatting of _device_ according to _fdata_
	198	* Note: The discipline's format_function is assumed to deliver formatting
d42e1712 SH	199	* commands to format multiple units of the device. In terms of the ECKD
d42e1712 SH	200	* devices this means CCWs are generated to format multiple tracks.
1da177e4	201	*/
d42e1712 SH	202	static int
d42e1712 SH	203	dasd_format(struct dasd_block block, struct format_data_t fdata)
1da177e4	204	{
8e09f215	205	struct dasd_device *base;
8542885b	206	int rc;
1da177e4	207
8e09f215 SW	208	base = block->base;
8e09f215 SW	209	if (base->discipline->format_device == NULL)
1da177e4 LT	210	return -EPERM;
1da177e4 LT	211
8e09f215	212	if (base->state != DASD_STATE_BASIC) {
d42e1712 SH	213	pr_warn("%s: The DASD cannot be formatted while it is enabled\n",
d42e1712 SH	214	dev_name(&base->cdev->dev));
1da177e4 LT	215	return -EBUSY;
	216	}
	217
8e09f215	218	DBF_DEV_EVENT(DBF_NOTICE, base,
b44b0ab3	219	"formatting units %u to %u (%u B blocks) flags %u",
1da177e4 LT	220	fdata->start_unit,
	221	fdata->stop_unit, fdata->blksize, fdata->intensity);
	222
	223	/* Since dasdfmt keeps the device open after it was disabled,
	224	* there still exists an inode for this device.
	225	* We must update i_blkbits, otherwise we might get errors when
	226	* enabling the device later.
	227	*/
	228	if (fdata->start_unit == 0) {
8e09f215	229	struct block_device *bdev = bdget_disk(block->gdp, 0);
1da177e4 LT	230	bdev->bd_inode->i_blkbits = blksize_bits(fdata->blksize);
	231	bdput(bdev);
	232	}
	233
8542885b JH	234	rc = base->discipline->format_device(base, fdata, 1);
	235	if (rc == -EAGAIN)
	236	rc = base->discipline->format_device(base, fdata, 0);
	237
	238	return rc;
1da177e4 LT	239	}
1da177e4 LT	240
8fd57520 JH	241	static int dasd_check_format(struct dasd_block *block,
	242	struct format_check_t *cdata)
	243	{
	244	struct dasd_device *base;
	245	int rc;
	246
	247	base = block->base;
	248	if (!base->discipline->check_device_format)
	249	return -ENOTTY;
	250
	251	rc = base->discipline->check_device_format(base, cdata, 1);
	252	if (rc == -EAGAIN)
	253	rc = base->discipline->check_device_format(base, cdata, 0);
	254
	255	return rc;
	256	}
	257
1da177e4 LT	258	/*
	259	* Format device.
	260	*/
	261	static int
13c6204f	262	dasd_ioctl_format(struct block_device bdev, void __user argp)
1da177e4	263	{
65f8da47	264	struct dasd_device *base;
1da177e4	265	struct format_data_t fdata;
65f8da47	266	int rc;
1da177e4 LT	267
	268	if (!capable(CAP_SYS_ADMIN))
	269	return -EACCES;
13c6204f	270	if (!argp)
1da177e4	271	return -EINVAL;
65f8da47 SW	272	base = dasd_device_from_gendisk(bdev->bd_disk);
	273	if (!base)
	274	return -ENODEV;
	275	if (base->features & DASD_FEATURE_READONLY \|\|
	276	test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
	277	dasd_put_device(base);
1da177e4	278	return -EROFS;
65f8da47 SW	279	}
	280	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t))) {
	281	dasd_put_device(base);
1da177e4	282	return -EFAULT;
65f8da47	283	}
1da177e4	284	if (bdev != bdev->bd_contains) {
baebc70a JP	285	pr_warn("%s: The specified DASD is a partition and cannot be formatted\n",
baebc70a JP	286	dev_name(&base->cdev->dev));
65f8da47	287	dasd_put_device(base);
1da177e4 LT	288	return -EINVAL;
1da177e4 LT	289	}
65f8da47 SW	290	rc = dasd_format(base->block, &fdata);
65f8da47 SW	291	dasd_put_device(base);
8fd57520 JH	292
	293	return rc;
	294	}
	295
	296	/*
	297	* Check device format
	298	*/
	299	static int dasd_ioctl_check_format(struct block_device bdev, void __user argp)
	300	{
	301	struct format_check_t cdata;
	302	struct dasd_device *base;
	303	int rc = 0;
	304
	305	if (!argp)
	306	return -EINVAL;
	307
	308	base = dasd_device_from_gendisk(bdev->bd_disk);
	309	if (!base)
	310	return -ENODEV;
	311	if (bdev != bdev->bd_contains) {
	312	pr_warn("%s: The specified DASD is a partition and cannot be checked\n",
	313	dev_name(&base->cdev->dev));
	314	rc = -EINVAL;
	315	goto out_err;
	316	}
	317
	318	if (copy_from_user(&cdata, argp, sizeof(cdata))) {
	319	rc = -EFAULT;
	320	goto out_err;
	321	}
	322
	323	rc = dasd_check_format(base->block, &cdata);
	324	if (rc)
	325	goto out_err;
	326
	327	if (copy_to_user(argp, &cdata, sizeof(cdata)))
	328	rc = -EFAULT;
	329
	330	out_err:
	331	dasd_put_device(base);
	332
65f8da47	333	return rc;
1da177e4 LT	334	}
	335
	336	#ifdef CONFIG_DASD_PROFILE
	337	/*
	338	* Reset device profile information
	339	*/
8e09f215	340	static int dasd_ioctl_reset_profile(struct dasd_block *block)
1da177e4	341	{
4fa52aa7	342	dasd_profile_reset(&block->profile);
1da177e4 LT	343	return 0;
	344	}
	345
	346	/*
	347	* Return device profile information
	348	*/
8e09f215	349	static int dasd_ioctl_read_profile(struct dasd_block block, void __user argp)
1da177e4	350	{
4fa52aa7	351	struct dasd_profile_info_t *data;
ba465d83	352	int rc = 0;
4fa52aa7 SW	353
	354	data = kmalloc(sizeof(*data), GFP_KERNEL);
	355	if (!data)
	356	return -ENOMEM;
	357
	358	spin_lock_bh(&block->profile.lock);
	359	if (block->profile.data) {
	360	data->dasd_io_reqs = block->profile.data->dasd_io_reqs;
	361	data->dasd_io_sects = block->profile.data->dasd_io_sects;
	362	memcpy(data->dasd_io_secs, block->profile.data->dasd_io_secs,
	363	sizeof(data->dasd_io_secs));
	364	memcpy(data->dasd_io_times, block->profile.data->dasd_io_times,
	365	sizeof(data->dasd_io_times));
	366	memcpy(data->dasd_io_timps, block->profile.data->dasd_io_timps,
	367	sizeof(data->dasd_io_timps));
	368	memcpy(data->dasd_io_time1, block->profile.data->dasd_io_time1,
	369	sizeof(data->dasd_io_time1));
	370	memcpy(data->dasd_io_time2, block->profile.data->dasd_io_time2,
	371	sizeof(data->dasd_io_time2));
	372	memcpy(data->dasd_io_time2ps,
	373	block->profile.data->dasd_io_time2ps,
	374	sizeof(data->dasd_io_time2ps));
	375	memcpy(data->dasd_io_time3, block->profile.data->dasd_io_time3,
	376	sizeof(data->dasd_io_time3));
	377	memcpy(data->dasd_io_nr_req,
	378	block->profile.data->dasd_io_nr_req,
	379	sizeof(data->dasd_io_nr_req));
	380	spin_unlock_bh(&block->profile.lock);
	381	} else {
	382	spin_unlock_bh(&block->profile.lock);
ba465d83 JL	383	rc = -EIO;
ba465d83 JL	384	goto out;
4fa52aa7 SW	385	}
4fa52aa7 SW	386	if (copy_to_user(argp, data, sizeof(*data)))
ba465d83 JL	387	rc = -EFAULT;
	388	out:
	389	kfree(data);
	390	return rc;
1da177e4 LT	391	}
1da177e4 LT	392	#else
8e09f215	393	static int dasd_ioctl_reset_profile(struct dasd_block *block)
1da177e4	394	{
2267a0c8	395	return -ENOTTY;
1da177e4 LT	396	}
1da177e4 LT	397
8e09f215	398	static int dasd_ioctl_read_profile(struct dasd_block block, void __user argp)
1da177e4	399	{
2267a0c8	400	return -ENOTTY;
1da177e4 LT	401	}
	402	#endif
	403
	404	/*
	405	* Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
	406	*/
8e09f215 SW	407	static int dasd_ioctl_information(struct dasd_block *block,
8e09f215 SW	408	unsigned int cmd, void __user *argp)
1da177e4	409	{
1da177e4	410	struct dasd_information2_t *dasd_info;
287a0933 SO	411	struct subchannel_id sch_id;
287a0933 SO	412	struct ccw_dev_id dev_id;
8e09f215	413	struct dasd_device *base;
1da177e4	414	struct ccw_device *cdev;
287a0933 SO	415	unsigned long flags;
287a0933 SO	416	int rc;
1da177e4	417
8e09f215	418	base = block->base;
294001a8	419	if (!base->discipline \|\| !base->discipline->fill_info)
1da177e4 LT	420	return -EINVAL;
1da177e4 LT	421
554a826e	422	dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
1da177e4 LT	423	if (dasd_info == NULL)
	424	return -ENOMEM;
	425
8e09f215	426	rc = base->discipline->fill_info(base, dasd_info);
1da177e4 LT	427	if (rc) {
	428	kfree(dasd_info);
	429	return rc;
	430	}
	431
8e09f215	432	cdev = base->cdev;
9a92fe48	433	ccw_device_get_id(cdev, &dev_id);
287a0933	434	ccw_device_get_schid(cdev, &sch_id);
1da177e4	435
9a92fe48	436	dasd_info->devno = dev_id.devno;
287a0933	437	dasd_info->schid = sch_id.sch_no;
1da177e4 LT	438	dasd_info->cu_type = cdev->id.cu_type;
	439	dasd_info->cu_model = cdev->id.cu_model;
	440	dasd_info->dev_type = cdev->id.dev_type;
	441	dasd_info->dev_model = cdev->id.dev_model;
8e09f215	442	dasd_info->status = base->state;
57467195 HH	443	/*
	444	* The open_count is increased for every opener, that includes
	445	* the blkdev_get in dasd_scan_partitions.
	446	* This must be hidden from user-space.
	447	*/
8e09f215 SW	448	dasd_info->open_count = atomic_read(&block->open_count);
8e09f215 SW	449	if (!block->bdev)
57467195	450	dasd_info->open_count++;
138c014d	451
1da177e4 LT	452	/*
	453	* check if device is really formatted
	454	* LDL / CDL was returned by 'fill_info'
	455	*/
8e09f215 SW	456	if ((base->state < DASD_STATE_READY) \|\|
8e09f215 SW	457	(dasd_check_blocksize(block->bp_block)))
1da177e4	458	dasd_info->format = DASD_FORMAT_NONE;
f24acd45	459
c6eb7b77	460	dasd_info->features \|=
8e09f215	461	((base->features & DASD_FEATURE_READONLY) != 0);
1da177e4	462
294001a8	463	memcpy(dasd_info->type, base->discipline->name, 4);
554a826e	464
8e09f215	465	if (block->request_queue->request_fn) {
1da177e4 LT	466	struct list_head *l;
	467	#ifdef DASD_EXTENDED_PROFILING
	468	{
	469	struct list_head *l;
8e09f215 SW	470	spin_lock_irqsave(&block->lock, flags);
8e09f215 SW	471	list_for_each(l, &block->request_queue->queue_head)
1da177e4	472	dasd_info->req_queue_len++;
8e09f215	473	spin_unlock_irqrestore(&block->lock, flags);
1da177e4 LT	474	}
1da177e4 LT	475	#endif /* DASD_EXTENDED_PROFILING */
8e09f215 SW	476	spin_lock_irqsave(get_ccwdev_lock(base->cdev), flags);
8e09f215 SW	477	list_for_each(l, &base->ccw_queue)
1da177e4	478	dasd_info->chanq_len++;
8e09f215	479	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev),
1da177e4 LT	480	flags);
	481	}
	482
	483	rc = 0;
13c6204f CH	484	if (copy_to_user(argp, dasd_info,
13c6204f CH	485	((cmd == (unsigned int) BIODASDINFO2) ?
8e09f215 SW	486	sizeof(struct dasd_information2_t) :
8e09f215 SW	487	sizeof(struct dasd_information_t))))
1da177e4 LT	488	rc = -EFAULT;
	489	kfree(dasd_info);
	490	return rc;
	491	}
	492
	493	/*
	494	* Set read only
	495	*/
	496	static int
13c6204f	497	dasd_ioctl_set_ro(struct block_device bdev, void __user argp)
1da177e4	498	{
65f8da47 SW	499	struct dasd_device *base;
65f8da47 SW	500	int intval, rc;
1da177e4 LT	501
	502	if (!capable(CAP_SYS_ADMIN))
	503	return -EACCES;
	504	if (bdev != bdev->bd_contains)
	505	// ro setting is not allowed for partitions
	506	return -EINVAL;
d2c993d8	507	if (get_user(intval, (int __user *)argp))
1da177e4	508	return -EFAULT;
65f8da47 SW	509	base = dasd_device_from_gendisk(bdev->bd_disk);
	510	if (!base)
	511	return -ENODEV;
	512	if (!intval && test_bit(DASD_FLAG_DEVICE_RO, &base->flags)) {
	513	dasd_put_device(base);
33b62a30	514	return -EROFS;
65f8da47	515	}
1da177e4	516	set_disk_ro(bdev->bd_disk, intval);
65f8da47 SW	517	rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, intval);
	518	dasd_put_device(base);
	519	return rc;
1da177e4 LT	520	}
1da177e4 LT	521
8e09f215	522	static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
88034865	523	struct cmbdata __user *argp)
8b2eb664	524	{
8b2eb664 CH	525	size_t size = _IOC_SIZE(cmd);
	526	struct cmbdata data;
	527	int ret;
	528
8e09f215	529	ret = cmf_readall(block->base->cdev, &data);
8b2eb664 CH	530	if (!ret && copy_to_user(argp, &data, min(size, sizeof(*argp))))
	531	return -EFAULT;
	532	return ret;
	533	}
	534
cfdb00a7 AB	535	int dasd_ioctl(struct block_device *bdev, fmode_t mode,
cfdb00a7 AB	536	unsigned int cmd, unsigned long arg)
1da177e4	537	{
65f8da47 SW	538	struct dasd_block *block;
65f8da47 SW	539	struct dasd_device *base;
88034865	540	void __user *argp;
65f8da47	541	int rc;
88034865 HC	542
	543	if (is_compat_task())
	544	argp = compat_ptr(arg);
	545	else
	546	argp = (void __user *)arg;
1da177e4	547
13c6204f CH	548	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
	549	PRINT_DEBUG("empty data ptr");
	550	return -EINVAL;
	551	}
1da177e4	552
65f8da47 SW	553	base = dasd_device_from_gendisk(bdev->bd_disk);
	554	if (!base)
	555	return -ENODEV;
	556	block = base->block;
	557	rc = 0;
13c6204f CH	558	switch (cmd) {
13c6204f CH	559	case BIODASDDISABLE:
65f8da47 SW	560	rc = dasd_ioctl_disable(bdev);
65f8da47 SW	561	break;
13c6204f	562	case BIODASDENABLE:
65f8da47 SW	563	rc = dasd_ioctl_enable(bdev);
65f8da47 SW	564	break;
13c6204f	565	case BIODASDQUIESCE:
65f8da47 SW	566	rc = dasd_ioctl_quiesce(block);
65f8da47 SW	567	break;
13c6204f	568	case BIODASDRESUME:
65f8da47 SW	569	rc = dasd_ioctl_resume(block);
65f8da47 SW	570	break;
5ea34a01 HR	571	case BIODASDABORTIO:
	572	rc = dasd_ioctl_abortio(block);
	573	break;
	574	case BIODASDALLOWIO:
	575	rc = dasd_ioctl_allowio(block);
	576	break;
13c6204f	577	case BIODASDFMT:
65f8da47 SW	578	rc = dasd_ioctl_format(bdev, argp);
65f8da47 SW	579	break;
8fd57520 JH	580	case BIODASDCHECKFMT:
	581	rc = dasd_ioctl_check_format(bdev, argp);
	582	break;
13c6204f	583	case BIODASDINFO:
65f8da47 SW	584	rc = dasd_ioctl_information(block, cmd, argp);
65f8da47 SW	585	break;
13c6204f	586	case BIODASDINFO2:
65f8da47 SW	587	rc = dasd_ioctl_information(block, cmd, argp);
65f8da47 SW	588	break;
13c6204f	589	case BIODASDPRRD:
65f8da47 SW	590	rc = dasd_ioctl_read_profile(block, argp);
65f8da47 SW	591	break;
13c6204f	592	case BIODASDPRRST:
65f8da47 SW	593	rc = dasd_ioctl_reset_profile(block);
65f8da47 SW	594	break;
13c6204f	595	case BLKROSET:
65f8da47 SW	596	rc = dasd_ioctl_set_ro(bdev, argp);
65f8da47 SW	597	break;
13c6204f	598	case DASDAPIVER:
65f8da47 SW	599	rc = dasd_ioctl_api_version(argp);
65f8da47 SW	600	break;
8b2eb664	601	case BIODASDCMFENABLE:
65f8da47 SW	602	rc = enable_cmf(base->cdev);
65f8da47 SW	603	break;
8b2eb664	604	case BIODASDCMFDISABLE:
65f8da47 SW	605	rc = disable_cmf(base->cdev);
65f8da47 SW	606	break;
8b2eb664	607	case BIODASDREADALLCMB:
65f8da47 SW	608	rc = dasd_ioctl_readall_cmb(block, cmd, argp);
65f8da47 SW	609	break;
13c6204f	610	default:
1107ccfb	611	/* if the discipline has an ioctl method try it. */
6b79d14e HC	612	rc = -ENOTTY;
6b79d14e HC	613	if (base->discipline->ioctl)
65f8da47	614	rc = base->discipline->ioctl(block, cmd, argp);
13c6204f	615	}
65f8da47 SW	616	dasd_put_device(base);
65f8da47 SW	617	return rc;
1da177e4	618	}