Hi Linus et al., here's another update of this patch queue: * Finally fix the typos Linus has pointed out twice already. * Turn the previous fault_in_iov_iter helper that was used for reads and writes into iov_iter_fault_in_writeable per Al's suggestion. Use the existing iov_iter_fault_in_readable for writes. * Add a done_before argument and an IOMAP_DIO_FAULT_RETRY flag to iomap_dio_rw to allow iomap_dio_rw to return partial results and resume with the rest of a request. This allows iomap_dio_rw to be used with page faults disabled without having to repeat any I/O. * Adjust the gfs2 patches accordingly. With that, the two iov_ter patches and the three iomap patches should hopefully be ready for mainline. There's one remaining issue on the gfs2 side: during read requests, when a writer now comes in in the middle of a read request, the read request can currently return a result that never existed on disk. So we need to ensure that we only resume read requests when we know that no writer got in the way, and retry the entire request otherwise. It should be relatively easy to add a mechanism to detect when a glock is "lost"; this won't affect the vfs or iomap patches. Thanks a lot, Andreas Andreas Gruenbacher (8): iov_iter: Introduce iov_iter_fault_in_writeable helper gfs2: Add wrapper for iomap_file_buffered_write gfs2: Fix mmap + page fault deadlocks for buffered I/O iomap: Fix iomap_dio_rw return value for user copies iomap: Add done_before argument to iomap_dio_rw iomap: Support restarting direct I/O requests after user copy failures iov_iter: Introduce noio flag to disable page faults gfs2: Fix mmap + page fault deadlocks for direct I/O fs/btrfs/file.c | 5 ++- fs/ext4/file.c | 5 ++- fs/gfs2/file.c | 95 +++++++++++++++++++++++++++++++++++++++---- fs/iomap/direct-io.c | 29 ++++++++++--- fs/xfs/xfs_file.c | 6 +-- fs/zonefs/super.c | 4 +- include/linux/iomap.h | 11 ++++- include/linux/mm.h | 3 ++ include/linux/uio.h | 2 + lib/iov_iter.c | 60 ++++++++++++++++++++++++--- mm/gup.c | 57 ++++++++++++++++++++++++++ 11 files changed, 246 insertions(+), 31 deletions(-) -- 2.26.3
