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Subject[PATCH V5 00/30] loop: Issue O_DIRECT aio using bio_vec
Date
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.

Changes from V4 include:
* moved iov-iter.c from mm/ to fs/
* removed dio_aligned helper
* insured that FUA write to loop device is committed to media
* removed no-longer-used REQ_KERNEL define

These patches apply to 3.8-rc2 and are also available at:
git://github.com/kleikamp/linux-shaggy.git loop_2013_01_04

My hopes are that this patchset is finally ready for linux-next.

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



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