1 files changed, 554 insertions, 0 deletions

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
new file mode 100644
index 000000000000..f1892baa3b18
--- /dev/null
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -0,0 +1,554 @@
+/*
+ * 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/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 (test_bit(DASD_FLAG_RO, &device->flags))
+		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 (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 |= test_bit(DASD_FLAG_RO, &device->flags) ?
+		DASD_FEATURE_READONLY : DASD_FEATURE_DEFAULT;
+
+	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;
+
+	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);
+	if (intval)
+		set_bit(DASD_FLAG_RO, &device->flags);
+	else
+		clear_bit(DASD_FLAG_RO, &device->flags);
+	return 0;
+}
+
+/*
+ * Return disk geometry.
+ */
+static int
+dasd_ioctl_getgeo(struct block_device *bdev, int no, long args)
+{
+	struct hd_geometry geo = { 0, };
+	struct dasd_device *device;
+
+	device =  bdev->bd_disk->private_data;
+	if (device == NULL)
+		return -ENODEV;
+
+	if (device == NULL || device->discipline == NULL ||
+	    device->discipline->fill_geometry == NULL)
+		return -EINVAL;
+
+	geo = (struct hd_geometry) {};
+	device->discipline->fill_geometry(device, &geo);
+	geo.start = get_start_sect(bdev) >> device->s2b_shift;
+	if (copy_to_user((struct hd_geometry __user *) args, &geo,
+			 sizeof (struct hd_geometry)))
+		return -EFAULT;
+
+	return 0;
+}
+
+/*
+ * 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 },
+	{ HDIO_GETGEO, dasd_ioctl_getgeo },
+	{ -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);