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Message-ID: <CA+icZUV17qR-kBRnYa+r0DfchQ0QtaBy-6c3f3QuXn0EGwuJzQ@mail.gmail.com> Date: Wed, 31 Dec 2014 21:38:02 +0100 From: Sedat Dilek <sedat.dilek@...il.com> To: Dave Kleikamp <dave.kleikamp@...cle.com> Cc: LKML <linux-kernel@...r.kernel.org>, linux-fsdevel <linux-fsdevel@...r.kernel.org>, Andrew Morton <akpm@...ux-foundation.org>, "Maxim V. Patlasov" <mpatlasov@...allels.com>, Zach Brown <zab@...bo.net> Subject: Re: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec On Thu, Jul 25, 2013 at 7:50 PM, Dave Kleikamp <dave.kleikamp@...cle.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 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in > the body of a message to majordomo@...r.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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