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Date: Thu, 25 Jul 2013 12:50:26 -0500 From: Dave Kleikamp <dave.kleikamp@...cle.com> To: linux-kernel@...r.kernel.org Cc: linux-fsdevel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org>, "Maxim V. Patlasov" <mpatlasov@...allels.com>, Zach Brown <zab@...bo.net>, Dave Kleikamp <dave.kleikamp@...cle.com> Subject: [PATCH V8 00/33] loop: Issue O_DIRECT aio using bio_vec 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 -- 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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