On Wed, Aug 16, 2017 at 12:44 AM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > Changes since v4 [1]: > * Drop the new vma ->fs_flags field, it can be replaced by just checking > ->vm_ops locally in the filesystem. This approach also allows > non-MAP_DIRECT vmas to be vma_merge() capable since vmas with > vm_ops->close() disable vma merging. (Jan) > > * Drop the new ->fmmap() operation, instead convert all ->mmap() > implementations tree-wide to take an extra 'map_flags' parameter. > (Jan) > > * Drop the cute (MAP_SHARED|MAP_PRIVATE) hack/mechanism to add new > validated flags mmap(2) and instead just define a new mmap syscall > variant (sys_mmap_pgoff_strict). (Andy) > > * Fix the fact that MAP_PRIVATE|MAP_DIRECT would silently fallback to > MAP_SHARED (addressed by the new syscall). (Kirill) > > * Require CAP_LINUX_IMMUTABLE for MAP_DIRECT to close any unforeseen > denial of service for unmanaged + unprivileged MAP_DIRECT usage. > (Kirill) > > * Switch MAP_DIRECT fault failures to SIGBUS (Kirill) > > * Add an fcntl mechanism to allow an unprivileged process to use > MAP_DIRECT on an fd setup by a privileged process. > > * Rework the MAP_DIRECT description to allow for future hardware where > it may not be required to software-pin the file offset to physical > address relationship. > > Given the tree-wide touches in this revision the patchset is starting to > feel more like -mm material than strictly xfs. > > [1]: https://lkml.org/lkml/2017/8/15/39 For easier testing / evaluation of these patches I went ahead and rebased them to v4.13-rc5, fixed up 0-day reports from the ->mmap() conversion, and published a for-4.14/map-direct branch here: https://git.kernel.org/pub/scm/linux/kernel/git/djbw/nvdimm.git/log/?h=for-4.14/map-direct
