1 files changed, 260 insertions, 92 deletions

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 25a0f2f8b0b9..f883990be626 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Author(s)......: Holger Smolinski <Holger.Smolinski@de.ibm.com>
  *		    Horst Hummel <Horst.Hummel@de.ibm.com>
@@ -9,26 +10,20 @@
  * i/o controls for the dasd driver.
  */
 
-#define KMSG_COMPONENT "dasd"
-
 #include <linux/interrupt.h>
-#include <linux/compat.h>
+#include <linux/export.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 <asm/uaccess.h>
-
-/* This is ugly... */
-#define PRINTK_HEADER "dasd_ioctl:"
+#include <linux/uaccess.h>
+#include <linux/dasd_mod.h>
 
 #include "dasd_int.h"
 
-
 static int
 dasd_ioctl_api_version(void __user *argp)
 {
@@ -53,11 +48,6 @@ dasd_ioctl_enable(struct block_device *bdev)
 		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;
 }
@@ -90,9 +80,7 @@ dasd_ioctl_disable(struct block_device *bdev)
 	 * 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);
+	set_capacity(bdev->bd_disk, 0);
 	dasd_put_device(base);
 	return 0;
 }
@@ -137,6 +125,7 @@ static int dasd_ioctl_resume(struct dasd_block *block)
 	spin_unlock_irqrestore(get_ccwdev_lock(base->cdev), flags);
 
 	dasd_schedule_block_bh(block);
+	dasd_schedule_device_bh(base);
 	return 0;
 }
 
@@ -226,16 +215,32 @@ dasd_format(struct dasd_block *block, struct format_data_t *fdata)
 	 * 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);
+		block->gdp->part0->bd_mapping->host->i_blkbits =
+			blksize_bits(fdata->blksize);
 	}
 
-	rc = base->discipline->format_device(base, fdata);
-	if (rc)
-		return rc;
+	rc = base->discipline->format_device(base, fdata, 1);
+	if (rc == -EAGAIN)
+		rc = base->discipline->format_device(base, fdata, 0);
 
-	return 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;
 }
 
 /*
@@ -264,15 +269,158 @@ dasd_ioctl_format(struct block_device *bdev, void __user *argp)
 		dasd_put_device(base);
 		return -EFAULT;
 	}
-	if (bdev != bdev->bd_contains) {
-		pr_warning("%s: The specified DASD is a partition and cannot "
-			   "be formatted\n",
-			   dev_name(&base->cdev->dev));
+	if (bdev_is_partition(bdev)) {
+		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_is_partition(bdev)) {
+		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;
+}
+
+static int dasd_release_space(struct dasd_device *device,
+			      struct format_data_t *rdata)
+{
+	if (!device->discipline->is_ese && !device->discipline->is_ese(device))
+		return -ENOTSUPP;
+	if (!device->discipline->release_space)
+		return -ENOTSUPP;
+
+	return device->discipline->release_space(device, rdata);
+}
+
+/*
+ * Release allocated space
+ */
+static int dasd_ioctl_release_space(struct block_device *bdev, void __user *argp)
+{
+	struct format_data_t rdata;
+	struct dasd_device *base;
+	int rc = 0;
+
+	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)) {
+		rc = -EROFS;
+		goto out_err;
+	}
+	if (bdev_is_partition(bdev)) {
+		pr_warn("%s: The specified DASD is a partition and tracks cannot be released\n",
+			dev_name(&base->cdev->dev));
+		rc = -EINVAL;
+		goto out_err;
+	}
+
+	if (copy_from_user(&rdata, argp, sizeof(rdata))) {
+		rc = -EFAULT;
+		goto out_err;
+	}
+
+	rc = dasd_release_space(base, &rdata);
+
+out_err:
+	dasd_put_device(base);
+
+	return rc;
+}
+
+/*
+ * Swap driver iternal copy relation.
+ */
+static int
+dasd_ioctl_copy_pair_swap(struct block_device *bdev, void __user *argp)
+{
+	struct dasd_copypair_swap_data_t data;
+	struct dasd_device *device;
+	int rc;
+
+	if (!capable(CAP_SYS_ADMIN))
+		return -EACCES;
+
+	device = dasd_device_from_gendisk(bdev->bd_disk);
+	if (!device)
+		return -ENODEV;
+
+	if (copy_from_user(&data, argp, sizeof(struct dasd_copypair_swap_data_t))) {
+		dasd_put_device(device);
+		return -EFAULT;
+	}
+	if (memchr_inv(data.reserved, 0, sizeof(data.reserved))) {
+		pr_warn("%s: Invalid swap data specified\n",
+			dev_name(&device->cdev->dev));
+		dasd_put_device(device);
+		return DASD_COPYPAIRSWAP_INVALID;
+	}
+	if (bdev_is_partition(bdev)) {
+		pr_warn("%s: The specified DASD is a partition and cannot be swapped\n",
+			dev_name(&device->cdev->dev));
+		dasd_put_device(device);
+		return DASD_COPYPAIRSWAP_INVALID;
+	}
+	if (!device->copy) {
+		pr_warn("%s: The specified DASD has no copy pair set up\n",
+			dev_name(&device->cdev->dev));
+		dasd_put_device(device);
+		return -ENODEV;
+	}
+	if (!device->discipline->copy_pair_swap) {
+		dasd_put_device(device);
+		return -EOPNOTSUPP;
+	}
+	rc = device->discipline->copy_pair_swap(device, data.primary,
+						data.secondary);
+	dasd_put_device(device);
+
 	return rc;
 }
 
@@ -347,14 +495,14 @@ static int dasd_ioctl_read_profile(struct dasd_block *block, void __user *argp)
 /*
  * Return dasd information. Used for BIODASDINFO and BIODASDINFO2.
  */
-static int dasd_ioctl_information(struct dasd_block *block,
-				  unsigned int cmd, void __user *argp)
+static int __dasd_ioctl_information(struct dasd_block *block,
+		struct dasd_information2_t *dasd_info)
 {
-	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;
+	struct list_head *l;
 	unsigned long flags;
 	int rc;
 
@@ -362,15 +510,9 @@ static int dasd_ioctl_information(struct dasd_block *block,
 	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);
+	if (rc)
 		return rc;
-	}
 
 	cdev = base->cdev;
 	ccw_device_get_id(cdev, &dev_id);
@@ -389,7 +531,7 @@ static int dasd_ioctl_information(struct dasd_block *block,
 	 * This must be hidden from user-space.
 	 */
 	dasd_info->open_count = atomic_read(&block->open_count);
-	if (!block->bdev)
+	if (!block->bdev_file)
 		dasd_info->open_count++;
 
 	/*
@@ -405,59 +547,49 @@ static int dasd_ioctl_information(struct dasd_block *block,
 
 	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);
-	}
+	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);
+	return 0;
+}
 
-	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;
+static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
+		size_t copy_size)
+{
+	struct dasd_information2_t *dasd_info;
+	int error;
+
+	dasd_info = kzalloc(sizeof(*dasd_info), GFP_KERNEL);
+	if (!dasd_info)
+		return -ENOMEM;
+
+	error = __dasd_ioctl_information(block, dasd_info);
+	if (!error && copy_to_user(argp, dasd_info, copy_size))
+		error = -EFAULT;
 	kfree(dasd_info);
-	return rc;
+	return error;
 }
 
 /*
  * Set read only
  */
-static int
-dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
+int dasd_set_read_only(struct block_device *bdev, bool ro)
 {
 	struct dasd_device *base;
-	int intval, rc;
+	int rc;
+
+	/* do not manipulate hardware state for partitions */
+	if (bdev_is_partition(bdev))
+		return 0;
 
-	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);
+	if (!ro && test_bit(DASD_FLAG_DEVICE_RO, &base->flags))
+		rc = -EROFS;
+	else
+		rc = dasd_set_feature(base->cdev, DASD_FEATURE_READONLY, ro);
 	dasd_put_device(base);
 	return rc;
 }
@@ -475,7 +607,7 @@ static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
 	return ret;
 }
 
-int dasd_ioctl(struct block_device *bdev, fmode_t mode,
+int dasd_ioctl(struct block_device *bdev, blk_mode_t mode,
 	       unsigned int cmd, unsigned long arg)
 {
 	struct dasd_block *block;
@@ -483,15 +615,10 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	void __user *argp;
 	int rc;
 
-	if (is_compat_task())
-		argp = compat_ptr(arg);
-	else
-		argp = (void __user *)arg;
+	argp = (void __user *)arg;
 
-	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg) {
-		PRINT_DEBUG("empty data ptr");
+	if ((_IOC_DIR(cmd) != _IOC_NONE) && !arg)
 		return -EINVAL;
-	}
 
 	base = dasd_device_from_gendisk(bdev->bd_disk);
 	if (!base)
@@ -520,11 +647,16 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	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);
+		rc = dasd_ioctl_information(block, argp,
+				sizeof(struct dasd_information_t));
 		break;
 	case BIODASDINFO2:
-		rc = dasd_ioctl_information(block, cmd, argp);
+		rc = dasd_ioctl_information(block, argp,
+				sizeof(struct dasd_information2_t));
 		break;
 	case BIODASDPRRD:
 		rc = dasd_ioctl_read_profile(block, argp);
@@ -532,9 +664,6 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	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;
@@ -547,6 +676,12 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	case BIODASDREADALLCMB:
 		rc = dasd_ioctl_readall_cmb(block, cmd, argp);
 		break;
+	case BIODASDRAS:
+		rc = dasd_ioctl_release_space(bdev, argp);
+		break;
+	case BIODASDCOPYPAIRSWAP:
+		rc = dasd_ioctl_copy_pair_swap(bdev, argp);
+		break;
 	default:
 		/* if the discipline has an ioctl method try it. */
 		rc = -ENOTTY;
@@ -556,3 +691,36 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
 	dasd_put_device(base);
 	return rc;
 }
+
+
+/**
+ * dasd_biodasdinfo() - fill out the dasd information structure
+ * @disk: [in] pointer to gendisk structure that references a DASD
+ * @info: [out] pointer to the dasd_information2_t structure
+ *
+ * Provide access to DASD specific information.
+ * The gendisk structure is checked if it belongs to the DASD driver by
+ * comparing the gendisk->fops pointer.
+ * If it does not belong to the DASD driver -EINVAL is returned.
+ * Otherwise the provided dasd_information2_t structure is filled out.
+ *
+ * Returns:
+ *   %0 on success and a negative error value on failure.
+ */
+int dasd_biodasdinfo(struct gendisk *disk, struct dasd_information2_t *info)
+{
+	struct dasd_device *base;
+	int error;
+
+	if (disk->fops != &dasd_device_operations)
+		return -EINVAL;
+
+	base = dasd_device_from_gendisk(disk);
+	if (!base)
+		return -ENODEV;
+	error = __dasd_ioctl_information(base->block, info);
+	dasd_put_device(base);
+	return error;
+}
+/* export that symbol_get in partition detection is possible */
+EXPORT_SYMBOL_GPL(dasd_biodasdinfo);