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    Subject[PATCH v3 00/22] loop: Issue O_DIRECT aio using bio_vec
    Date
    This is the current version of the patchset I presented at the LSF-MM
    Summit in San Francisco in April. I apologize for letting it go so
    long before re-submitting.

    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.

    The downside of this is that in its current implementation, performance takes
    a big hit for non-synchonous I/O, since the underlying page cache is bypassed.
    The tradeoff is that all writes to the loop device make it to the underlying
    media, making loop-mounted file systems recoverable.

    These patches apply to 3.7-rc1 and are also available at:
    git://github.com/kleikamp/linux-shaggy.git loop_2012_10_18

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

    Dave Kleikamp (8):
    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: 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
    btrfs: add support for read_iter and write_iter

    From: Zach Brown (2):
    aio: add aio support for iov_iter arguments
    loop: use aio to perform io on the underlying file

    Zach Brown (11):
    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
    dio: create a dio_aligned() helper function
    fs: pull iov_iter use higher up the stack
    aio: add aio_kernel_() interface
    bio: add bvec_length(), like iov_length()
    ocfs2: add support for read_iter, write_iter, and direct_IO_bvec

    Documentation/filesystems/Locking | 4 +-
    Documentation/filesystems/vfs.txt | 4 +-
    drivers/block/loop.c | 129 +++++++++----
    fs/9p/vfs_addr.c | 8 +-
    fs/9p/vfs_file.c | 4 +
    fs/aio.c | 156 +++++++++++++++
    fs/block_dev.c | 44 ++++-
    fs/btrfs/file.c | 55 +++---
    fs/btrfs/inode.c | 61 +++---
    fs/ceph/addr.c | 3 +-
    fs/cifs/file.c | 4 +-
    fs/direct-io.c | 253 ++++++++++++++++--------
    fs/ext2/file.c | 2 +
    fs/ext2/inode.c | 8 +-
    fs/ext3/file.c | 2 +
    fs/ext3/inode.c | 15 +-
    fs/ext4/ext4.h | 3 +-
    fs/ext4/file.c | 49 +++--
    fs/ext4/indirect.c | 16 +-
    fs/ext4/inode.c | 27 ++-
    fs/fat/file.c | 2 +
    fs/fat/inode.c | 10 +-
    fs/fuse/file.c | 40 ++--
    fs/gfs2/aops.c | 7 +-
    fs/hfs/inode.c | 9 +-
    fs/hfsplus/inode.c | 8 +-
    fs/jfs/file.c | 2 +
    fs/jfs/inode.c | 7 +-
    fs/nfs/direct.c | 176 +++++++++++------
    fs/nfs/file.c | 48 +++--
    fs/nfs/internal.h | 2 +
    fs/nfs/nfs4file.c | 4 +
    fs/nilfs2/file.c | 2 +
    fs/nilfs2/inode.c | 8 +-
    fs/ocfs2/aops.c | 8 +-
    fs/ocfs2/file.c | 82 +++++---
    fs/ocfs2/ocfs2_trace.h | 6 +-
    fs/reiserfs/file.c | 2 +
    fs/reiserfs/inode.c | 7 +-
    fs/udf/file.c | 3 +-
    fs/udf/inode.c | 10 +-
    fs/xfs/xfs_aops.c | 13 +-
    include/linux/aio.h | 18 ++
    include/linux/bio.h | 8 +
    include/linux/fs.h | 135 +++++++++++--
    include/linux/nfs_fs.h | 9 +-
    include/uapi/linux/aio_abi.h | 2 +
    include/uapi/linux/loop.h | 1 +
    mm/Makefile | 2 +-
    mm/filemap.c | 395 ++++++++++++++++----------------------
    mm/iov-iter.c | 383 ++++++++++++++++++++++++++++++++++++
    mm/page_io.c | 8 +-
    52 files changed, 1609 insertions(+), 655 deletions(-)
    create mode 100644 mm/iov-iter.c

    --
    1.7.12.3



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