>>>>> "Nick" == Nick Piggin <npiggin@xxxxxxx> writes: Nick, >> Filesystems will inevitably have to be integrity-aware for that to >> work. And it will be their job to keep the data pages stable during >> DMA. Nick> Closing the while it is dirty, while it is being written back Nick> window still leaves a pretty big window. Also, how do you handle Nick> mmap writes? Write protect and checksum the destination page Nick> after every store? Or leave some window between when the pagecache Nick> is dirtied and when it is written back? So I don't know whether Nick> it's worth putting a lot of effort into this case. I'm mostly interested in the cases where the filesystem acts as a conduit for integrity metadata from user space. I agree the corruption windows inside the kernel are only of moderate interest. No filesystems have added support for explicitly protecting a bio because the block layer's function to do so automatically is just a few function calls away. -- Martin K. Petersen Oracle Linux Engineering -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
