Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec

[Sedat Dilek <sedat.dilek@gmail.com>]

On Thu, Jul 25, 2013 at 7:50 PM, Dave Kleikamp <dave.kleikamp@oracle.com> wrote:
> 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.
>
> Verion 8 is little changed from Version 7 that I send out in March, just
> updated to the latest kernel. These patches apply to 3.11-rc2 and can
> also be found at:
>
> git://github.com/kleikamp/linux-shaggy.git aio_loop
>

What has happened to that aio_loop patchset?
Is it in Linux-next?
( /me started to play with "block: loop: convert to blk-mq (v3)", so I
recalled this other improvement. )

- Sedat -

> Asias He (1):
>   block_dev: add support for read_iter, write_iter
>
> Dave Kleikamp (22):
>   iov_iter: iov_iter_copy_from_user() should use non-atomic copy
>   iov_iter: add __iovec_copy_to_user()
>   fuse: convert fuse to use iov_iter_copy_[to|from]_user
>   iov_iter: ii_iovec_copy_to_user should pre-fault user pages
>   dio: Convert direct_IO to use iov_iter
>   dio: add bio_vec support to __blockdev_direct_IO()
>   aio: add aio_kernel_() interface
>   aio: add aio support for iov_iter arguments
>   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
>   ocfs2: add support for read_iter and  write_iter
>   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
>
> Hugh Dickins (1):
>   tmpfs: add support for read_iter and write_iter
>
> Zach Brown (9):
>   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
>   bio: add bvec_length(), like iov_length()
>   loop: use aio to perform io on the underlying file
>
>  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/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                            | 152 ++++++++++++-
>  fs/bad_inode.c                      |  14 ++
>  fs/bfs/file.c                       |   4 +-
>  fs/block_dev.c                      |  27 ++-
>  fs/btrfs/file.c                     |  42 ++--
>  fs/btrfs/inode.c                    |  63 +++---
>  fs/ceph/addr.c                      |   3 +-
>  fs/cifs/file.c                      |   4 +-
>  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/cuse.c                      |  10 +-
>  fs/fuse/file.c                      |  90 ++++----
>  fs/fuse/fuse_i.h                    |   5 +-
>  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/internal.h                       |   4 +
>  fs/iov-iter.c                       | 411 ++++++++++++++++++++++++++++++++++
>  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                     |  55 ++---
>  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                     |  78 +++++--
>  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                 |  20 +-
>  include/linux/bio.h                 |   8 +
>  include/linux/blk_types.h           |   2 -
>  include/linux/fs.h                  | 165 ++++++++++++--
>  include/linux/nfs_fs.h              |  13 +-
>  include/uapi/linux/aio_abi.h        |   2 +
>  include/uapi/linux/loop.h           |   1 +
>  mm/filemap.c                        | 433 ++++++++++++++----------------------
>  mm/page_io.c                        |  15 +-
>  mm/shmem.c                          |  61 ++---
>  87 files changed, 1862 insertions(+), 1002 deletions(-)
>  create mode 100644 fs/iov-iter.c
>
> --
> 1.8.3.4
>
> --
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