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dasd: implement ->set_read_only to hook into BLKROSET processing

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Implement the ->set_read_only method instead of parsing the actual
ioctl command.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2020-11-03 11:00:14 +01:00 committed by Jens Axboe
parent 118cf084ad
commit 2c1b6ec170
3 changed files with 12 additions and 19 deletions
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1
drivers/s390/block/dasd.c
View File

@ -3394,6 +3394,7 @@ dasd_device_operations = {
.ioctl = dasd_ioctl,
.compat_ioctl = dasd_ioctl,
.getgeo = dasd_getgeo,
.set_read_only = dasd_set_read_only,
};
/*******************************************************************************

3
drivers/s390/block/dasd_int.h
View File

@ -844,7 +844,8 @@ int dasd_scan_partitions(struct dasd_block *);
void dasd_destroy_partitions(struct dasd_block *);
/* externals in dasd_ioctl.c */
int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
int dasd_ioctl(struct block_device *, fmode_t, unsigned int, unsigned long);
int dasd_set_read_only(struct block_device *bdev, bool ro);
/* externals in dasd_proc.c */
int dasd_proc_init(void);

27
drivers/s390/block/dasd_ioctl.c
View File

@ -532,28 +532,22 @@ static int dasd_ioctl_information(struct dasd_block *block, void __user *argp,
/*
* 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;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
/* do not manipulate hardware state for partitions */
if (bdev_is_partition(bdev))
// ro setting is not allowed for partitions
return -EINVAL;
if (get_user(intval, (int __user *)argp))
return -EFAULT;
return 0;
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;
}
@ -633,9 +627,6 @@ 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;