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path: root/drivers/s390/block/dasd_ioctl.c
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Diffstat (limited to 'drivers/s390/block/dasd_ioctl.c')
-rw-r--r--drivers/s390/block/dasd_ioctl.c76
1 files changed, 57 insertions, 19 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 9a5f3add325f..777734d1b4e5 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -22,6 +22,7 @@
#include <asm/schid.h>
#include <asm/cmb.h>
#include <linux/uaccess.h>
+#include <linux/dasd_mod.h>
/* This is ugly... */
#define PRINTK_HEADER "dasd_ioctl:"
@@ -457,10 +458,9 @@ 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;
@@ -473,15 +473,9 @@ 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);
@@ -520,15 +514,24 @@ static int dasd_ioctl_information(struct dasd_block *block,
list_for_each(l, &base->ccw_queue)
dasd_info->chanq_len++;
spin_unlock_irqrestore(&block->queue_lock, 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;
}
/*
@@ -622,10 +625,12 @@ int dasd_ioctl(struct block_device *bdev, fmode_t mode,
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);
@@ -660,3 +665,36 @@ 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);