[PATCH V9 00/33] loop: Issue O_DIRECT aio using bio_vec

From: Dave Kleikamp
Date: Wed Oct 16 2013 - 10:09:23 EST


This patchset has been in linux-next since late August. I'm targetting
the 3.13 merge window. Changes from version 8 include:
- integration with aio changes for the 3.12 kernel
- making the new IOCB_CMD opcodes inaccessible from user space
- making the loop device's sector size compatible with the underlying device

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.

This patchset can 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 | 158 +++++++++----
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 | 136 ++++++++++-
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 | 301 ++++++++++++++++---------
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 | 25 ++-
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/loop.h | 1 +
mm/filemap.c | 433 ++++++++++++++----------------------
mm/page_io.c | 15 +-
mm/shmem.c | 61 ++---
86 files changed, 1857 insertions(+), 1003 deletions(-)
create mode 100644 fs/iov-iter.c

--
1.8.4

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