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Gmane
From: Dave Kleikamp <dave.kleikamp <at> oracle.com>
Subject: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec
Newsgroups: gmane.linux.kernel
Date: Thursday 25th July 2013 17:50:26 UTC (over 3 years ago)
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

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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