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block: disallow Persistent Reservation on partitions

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Refuse Persistent Reservation operations on partitions as reservation
on partitions doesn't make sense.

Besides, introduce blkdev_pr_allowed() helper, where more policies could
be placed here later.

Signed-off-by: Jingbo Xu <jefflexu@linux.alibaba.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20230613084008.93795-2-jefflexu@linux.alibaba.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jingbo Xu 2023-06-13 16:40:07 +08:00 committed by Jens Axboe
parent c576c4bf9e
commit 1262962166
1 changed files with 17 additions and 5 deletions
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22
block/ioctl.c
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@ -254,13 +254,25 @@ int blkdev_compat_ptr_ioctl(struct block_device *bdev, blk_mode_t mode,
EXPORT_SYMBOL(blkdev_compat_ptr_ioctl);
#endif
static bool blkdev_pr_allowed(struct block_device *bdev)
{
/* no sense to make reservations for partitions */
if (bdev_is_partition(bdev))
return false;
if (capable(CAP_SYS_ADMIN))
return true;
return false;
}
static int blkdev_pr_register(struct block_device *bdev,
struct pr_registration __user *arg)
{
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_registration reg;
if (!capable(CAP_SYS_ADMIN))
if (!blkdev_pr_allowed(bdev))
return -EPERM;
if (!ops || !ops->pr_register)
return -EOPNOTSUPP;
@ -278,7 +290,7 @@ static int blkdev_pr_reserve(struct block_device *bdev,
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_reservation rsv;
if (!capable(CAP_SYS_ADMIN))
if (!blkdev_pr_allowed(bdev))
return -EPERM;
if (!ops || !ops->pr_reserve)
return -EOPNOTSUPP;
@ -296,7 +308,7 @@ static int blkdev_pr_release(struct block_device *bdev,
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_reservation rsv;
if (!capable(CAP_SYS_ADMIN))
if (!blkdev_pr_allowed(bdev))
return -EPERM;
if (!ops || !ops->pr_release)
return -EOPNOTSUPP;
@ -314,7 +326,7 @@ static int blkdev_pr_preempt(struct block_device *bdev,
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_preempt p;
if (!capable(CAP_SYS_ADMIN))
if (!blkdev_pr_allowed(bdev))
return -EPERM;
if (!ops || !ops->pr_preempt)
return -EOPNOTSUPP;
@ -332,7 +344,7 @@ static int blkdev_pr_clear(struct block_device *bdev,
const struct pr_ops *ops = bdev->bd_disk->fops->pr_ops;
struct pr_clear c;
if (!capable(CAP_SYS_ADMIN))
if (!blkdev_pr_allowed(bdev))
return -EPERM;
if (!ops || !ops->pr_clear)
return -EOPNOTSUPP;