1 files changed, 106 insertions, 216 deletions

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index fafeeae52675..b8c80d28df41 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -16,6 +16,7 @@
 #include <linux/blkpg.h>
 
 #include <asm/ccwdev.h>
+#include <asm/cmb.h>
 #include <asm/uaccess.h>
 
 /* This is ugly... */
@@ -23,116 +24,12 @@
 
 #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;
-}
-
-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;
-}
 
 static int
-dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
+dasd_ioctl_api_version(void __user *argp)
 {
 	int ver = DASD_API_VERSION;
-	return put_user(ver, (int __user *) args);
+	return put_user(ver, (int __user *)argp);
 }
 
 /*
@@ -140,20 +37,18 @@ dasd_ioctl_api_version(struct block_device *bdev, int no, long args)
  * used by dasdfmt after BIODASDDISABLE to retrigger blocksize detection
  */
 static int
-dasd_ioctl_enable(struct block_device *bdev, int no, long args)
+dasd_ioctl_enable(struct block_device *bdev)
 {
-	struct dasd_device *device;
+	struct dasd_device *device = bdev->bd_disk->private_data;
 
 	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);
+	mutex_lock(&bdev->bd_mutex);
 	i_size_write(bdev->bd_inode, (loff_t)get_capacity(device->gdp) << 9);
-	up(&bdev->bd_sem);
+	mutex_unlock(&bdev->bd_mutex);
 	return 0;
 }
 
@@ -162,15 +57,13 @@ dasd_ioctl_enable(struct block_device *bdev, int no, long args)
  * Used by dasdfmt. Disable I/O operations but allow ioctls.
  */
 static int
-dasd_ioctl_disable(struct block_device *bdev, int no, long args)
+dasd_ioctl_disable(struct block_device *bdev)
 {
-	struct dasd_device *device;
+	struct dasd_device *device = bdev->bd_disk->private_data;
 
 	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
@@ -184,9 +77,9 @@ dasd_ioctl_disable(struct block_device *bdev, int no, long args)
 	 * Set i_size to zero, since read, write, etc. check against this
 	 * value.
 	 */
-	down(&bdev->bd_sem);
+	mutex_lock(&bdev->bd_mutex);
 	i_size_write(bdev->bd_inode, 0);
-	up(&bdev->bd_sem);
+	mutex_unlock(&bdev->bd_mutex);
 	return 0;
 }
 
@@ -194,18 +87,13 @@ dasd_ioctl_disable(struct block_device *bdev, int no, long args)
  * Quiesce device.
  */
 static int
-dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
+dasd_ioctl_quiesce(struct dasd_device *device)
 {
-	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);
@@ -219,18 +107,13 @@ dasd_ioctl_quiesce(struct block_device *bdev, int no, long args)
  * Quiesce device.
  */
 static int
-dasd_ioctl_resume(struct block_device *bdev, int no, long args)
+dasd_ioctl_resume(struct dasd_device *device)
 {
-	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");
 	
@@ -302,25 +185,19 @@ dasd_format(struct dasd_device * device, struct format_data_t * fdata)
  * Format device.
  */
 static int
-dasd_ioctl_format(struct block_device *bdev, int no, long args)
+dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 {
-	struct dasd_device *device;
+	struct dasd_device *device = bdev->bd_disk->private_data;
 	struct format_data_t fdata;
 
 	if (!capable(CAP_SYS_ADMIN))
 		return -EACCES;
-	if (!args)
+	if (!argp)
 		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)))
+	if (copy_from_user(&fdata, argp, sizeof(struct format_data_t)))
 		return -EFAULT;
 	if (bdev != bdev->bd_contains) {
 		DEV_MESSAGE(KERN_WARNING, device, "%s",
@@ -335,17 +212,8 @@ dasd_ioctl_format(struct block_device *bdev, int no, long args)
  * Reset device profile information
  */
 static int
-dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
+dasd_ioctl_reset_profile(struct dasd_device *device)
 {
-	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;
 }
@@ -354,31 +222,24 @@ dasd_ioctl_reset_profile(struct block_device *bdev, int no, long args)
  * Return device profile information
  */
 static int
-dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
+dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
 {
-	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,
+	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 block_device *bdev, int no, long args)
+dasd_ioctl_reset_profile(struct dasd_device *device)
 {
 	return -ENOSYS;
 }
 
 static int
-dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
+dasd_ioctl_read_profile(struct dasd_device *device, void __user *argp)
 {
 	return -ENOSYS;
 }
@@ -388,22 +249,18 @@ dasd_ioctl_read_profile(struct block_device *bdev, int no, long args)
  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
  */
 static int
-dasd_ioctl_information(struct block_device *bdev, int no, long args)
+dasd_ioctl_information(struct dasd_device *device,
+		unsigned int cmd, void __user *argp)
 {
-	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);
+	dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
 	if (dasd_info == NULL)
 		return -ENOMEM;
 
@@ -446,8 +303,7 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
 		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
@@ -467,8 +323,8 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
 	}
 
 	rc = 0;
-	if (copy_to_user((long __user *) args, (long *) dasd_info,
-			 ((no == (unsigned int) BIODASDINFO2) ?
+	if (copy_to_user(argp, dasd_info,
+			 ((cmd == (unsigned int) BIODASDINFO2) ?
 			  sizeof (struct dasd_information2_t) :
 			  sizeof (struct dasd_information_t))))
 		rc = -EFAULT;
@@ -480,69 +336,103 @@ dasd_ioctl_information(struct block_device *bdev, int no, long args)
  * Set read only
  */
 static int
-dasd_ioctl_set_ro(struct block_device *bdev, int no, long args)
+dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 {
-	struct dasd_device *device;
-	int intval, rc;
+	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 __user *) args))
+	if (get_user(intval, (int *)argp))
 		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;
+	return dasd_set_feature(device->cdev, DASD_FEATURE_READONLY, intval);
 }
 
-/*
- * List of static ioctls.
- */
-static struct { int no; dasd_ioctl_fn_t fn; } dasd_ioctls[] =
+static int
+dasd_ioctl_readall_cmb(struct dasd_device *device, unsigned int cmd,
+		unsigned long arg)
 {
-	{ 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 }
-};
+	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_init(void)
+dasd_ioctl(struct inode *inode, struct file *file,
+	   unsigned int cmd, unsigned long arg)
 {
-	int i;
+	struct block_device *bdev = inode->i_bdev;
+	struct dasd_device *device = bdev->bd_disk->private_data;
+	void __user *argp = (void __user *)arg;
 
-	for (i = 0; dasd_ioctls[i].no != -1; i++)
-		dasd_ioctl_no_register(NULL, dasd_ioctls[i].no,
-				       dasd_ioctls[i].fn);
-	return 0;
+	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;
+	}
 }
 
-void
-dasd_ioctl_exit(void)
+long
+dasd_compat_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 {
-	int i;
+	int rval;
 
-	for (i = 0; dasd_ioctls[i].no != -1; i++)
-		dasd_ioctl_no_unregister(NULL, dasd_ioctls[i].no,
-					 dasd_ioctls[i].fn);
+	lock_kernel();
+	rval = dasd_ioctl(filp->f_dentry->d_inode, filp, cmd, arg);
+	unlock_kernel();
 
+	return (rval == -EINVAL) ? -ENOIOCTLCMD : rval;
 }
-
-EXPORT_SYMBOL(dasd_ioctl_no_register);
-EXPORT_SYMBOL(dasd_ioctl_no_unregister);