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 -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
