Hi Christoph,
On 11/15/21 9:14 PM, Christoph Hellwig wrote:
On Mon, Nov 15, 2021 at 10:05:42AM +0800, Lu Baolu wrote:
+enum iommu_dma_owner {
+ DMA_OWNER_NONE,
+ DMA_OWNER_KERNEL,
+ DMA_OWNER_USER,
+};
+
+ enum iommu_dma_owner dma_owner;
+ refcount_t owner_cnt;
+ struct file *owner_user_file;
I'd just overload the ownership into owner_user_file,
NULL -> no owner
(struct file *)1UL) -> kernel
real pointer -> user
Which could simplify a lot of the code dealing with the owner.
Yeah! Sounds reasonable. I will make this in the next version.
Best regards,
baolu
