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    Subject[PATCH V6 00/30] loop: Issue O_DIRECT aio using bio_vec
    Date
    Al,
    I'd like to push this patchset to linux-next. Would you like to pull it
    into your vfs tree, would you rather I submitted it separately, or do
    you have any issues with it before including it?

    This patchset was begun by Zach Brown and was originally submitted for
    review in October, 2009. Feedback was positive, and I have picked up
    where he left off, porting his patches to the latest mainline kernel
    and adding support more file systems.

    This patch series adds a kernel interface to fs/aio.c so that kernel code can
    issue concurrent asynchronous IO to file systems. It adds an aio command and
    file system methods which specify io memory with pages instead of userspace
    addresses.

    This series was written to reduce the current overhead loop imposes by
    performing synchronus buffered file system IO from a kernel thread. These
    patches turn loop into a light weight layer that translates bios into iocbs.

    It introduces new file ops, read_iter() and write_iter(), that replace the
    aio_read() and aio_write() operations. The iov_iter structure can now contain
    either a user-space iovec or a kernel-space bio_vec. Since it would be
    overly complicated to replace every instance of aio_read() and aio_write(),
    the old operations are not removed, but file systems implementing the new
    ones need not keep the old ones.

    The only change from V5 is a fixing a serious cut-and-paste error in patch
    17 that made aio writes fail.

    These patches apply to 3.8-rc5 and are also available at:
    git://github.com/kleikamp/linux-shaggy.git loop_v6

    Asias He (1):
    block_dev: add support for read_iter, write_iter

    Dave Kleikamp (17):
    iov_iter: iov_iter_copy_from_user() should use non-atomic copy
    fuse: convert fuse to use iov_iter_copy_[to|from]_user
    dio: Convert direct_IO to use iov_iter
    dio: add bio_vec support to __blockdev_direct_IO()
    fs: create file_readable() and file_writable() functions
    fs: use read_iter and write_iter rather than aio_read and aio_write
    fs: add read_iter and write_iter to several file systems
    ext4: add support for read_iter and write_iter
    nfs: add support for read_iter, write_iter
    nfs: simplify swap
    btrfs: add support for read_iter and write_iter
    xfs: add support for read_iter and write_iter
    gfs2: Convert aio_read/write ops to read/write_iter
    udf: convert file ops from aio_read/write to read/write_iter
    afs: add support for read_iter and write_iter
    ecrpytfs: Convert aio_read/write ops to read/write_iter
    ubifs: convert file ops from aio_read/write to read/write_iter

    Zach Brown (12):
    iov_iter: move into its own file
    iov_iter: add copy_to_user support
    iov_iter: hide iovec details behind ops function pointers
    iov_iter: add bvec support
    iov_iter: add a shorten call
    iov_iter: let callers extract iovecs and bio_vecs
    fs: pull iov_iter use higher up the stack
    aio: add aio_kernel_() interface
    aio: add aio support for iov_iter arguments
    bio: add bvec_length(), like iov_length()
    loop: use aio to perform io on the underlying file
    ocfs2: add support for read_iter, write_iter, and direct_IO_bvec

    Documentation/filesystems/Locking | 6 +-
    Documentation/filesystems/vfs.txt | 12 +-
    drivers/block/loop.c | 148 +++++++++----
    drivers/char/raw.c | 4 +-
    drivers/mtd/nand/nandsim.c | 4 +-
    drivers/staging/ccg/storage_common.c | 4 +-
    drivers/usb/gadget/storage_common.c | 4 +-
    fs/9p/vfs_addr.c | 12 +-
    fs/9p/vfs_file.c | 8 +-
    fs/Makefile | 2 +-
    fs/adfs/file.c | 4 +-
    fs/affs/file.c | 4 +-
    fs/afs/file.c | 4 +-
    fs/afs/internal.h | 3 +-
    fs/afs/write.c | 9 +-
    fs/aio.c | 170 ++++++++++++++-
    fs/bad_inode.c | 14 ++
    fs/bfs/file.c | 4 +-
    fs/block_dev.c | 27 ++-
    fs/btrfs/file.c | 42 ++--
    fs/btrfs/inode.c | 61 +++---
    fs/ceph/addr.c | 3 +-
    fs/cifs/file.c | 4 +-
    fs/compat.c | 10 +-
    fs/direct-io.c | 223 ++++++++++++++------
    fs/ecryptfs/file.c | 15 +-
    fs/exofs/file.c | 4 +-
    fs/ext2/file.c | 4 +-
    fs/ext2/inode.c | 8 +-
    fs/ext3/file.c | 4 +-
    fs/ext3/inode.c | 15 +-
    fs/ext4/ext4.h | 3 +-
    fs/ext4/file.c | 34 +--
    fs/ext4/indirect.c | 16 +-
    fs/ext4/inode.c | 23 +-
    fs/f2fs/data.c | 4 +-
    fs/f2fs/file.c | 4 +-
    fs/fat/file.c | 4 +-
    fs/fat/inode.c | 10 +-
    fs/fuse/file.c | 40 ++--
    fs/gfs2/aops.c | 7 +-
    fs/gfs2/file.c | 21 +-
    fs/hfs/inode.c | 11 +-
    fs/hfsplus/inode.c | 10 +-
    fs/hostfs/hostfs_kern.c | 4 +-
    fs/hpfs/file.c | 4 +-
    fs/iov-iter.c | 386 ++++++++++++++++++++++++++++++++++
    fs/jffs2/file.c | 8 +-
    fs/jfs/file.c | 4 +-
    fs/jfs/inode.c | 7 +-
    fs/logfs/file.c | 4 +-
    fs/minix/file.c | 4 +-
    fs/nfs/direct.c | 302 +++++++++++++++++---------
    fs/nfs/file.c | 33 ++-
    fs/nfs/internal.h | 4 +-
    fs/nfs/nfs4file.c | 4 +-
    fs/nilfs2/file.c | 4 +-
    fs/nilfs2/inode.c | 8 +-
    fs/ocfs2/aops.c | 8 +-
    fs/ocfs2/aops.h | 2 +-
    fs/ocfs2/file.c | 53 ++---
    fs/ocfs2/inode.h | 2 -
    fs/ocfs2/ocfs2_trace.h | 6 +-
    fs/omfs/file.c | 4 +-
    fs/ramfs/file-mmu.c | 4 +-
    fs/ramfs/file-nommu.c | 4 +-
    fs/read_write.c | 66 +++++-
    fs/read_write.h | 4 +
    fs/reiserfs/file.c | 4 +-
    fs/reiserfs/inode.c | 7 +-
    fs/romfs/mmap-nommu.c | 2 +-
    fs/sysv/file.c | 4 +-
    fs/ubifs/file.c | 12 +-
    fs/udf/file.c | 13 +-
    fs/udf/inode.c | 10 +-
    fs/ufs/file.c | 4 +-
    fs/xfs/xfs_aops.c | 13 +-
    fs/xfs/xfs_file.c | 51 ++---
    include/linux/aio.h | 18 ++
    include/linux/bio.h | 8 +
    include/linux/blk_types.h | 2 -
    include/linux/fs.h | 155 ++++++++++++--
    include/linux/nfs_fs.h | 13 +-
    include/uapi/linux/aio_abi.h | 2 +
    include/uapi/linux/loop.h | 1 +
    mm/filemap.c | 395 +++++++++++++++--------------------
    mm/page_io.c | 15 +-
    87 files changed, 1789 insertions(+), 892 deletions(-)
    create mode 100644 fs/iov-iter.c

    --
    1.8.1.1



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