diff options
Diffstat (limited to 'drivers/s390')
-rw-r--r-- | drivers/s390/block/dasd_ioctl.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c index 9b7782395c37..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:" @@ -664,3 +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); |