> From: dhowells@xxxxxxxxxx [mailto:dhowells@xxxxxxxxxx] > David Cross <david.cross@xxxxxxxxxxx> wrote: > > This patch adds the mpage_cleardirty function to the cachefiles > implementation in the kernel. > Ummm... How is this used by cachefiles? Nothing in this patch actually > uses > mpage_cleardirty(). This is used by the current west bridge driver in the linux-next tree, marked as BROKEN at the moment. It is used in order to clear dirty pages from the page cache for a specific file after it has been allocated. This allows west bridge to transfer data from USB to storage directly without requiring that the file data path go through the CPU. The easiest way to think of this is that it allows for direct file based DMA. Please let me know if you have any additional questions or concerns on this. Thanks, David --------------------------------------------------------------- This message and any attachments may contain Cypress (or its subsidiaries) confidential information. If it has been received in error, please advise the sender and immediately delete this message. --------------------------------------------------------------- -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/linux-cachefs
