[PATCH v8 0/4] VFS: In-kernel copy system call

[Anna Schumaker <Anna.Schumaker-HgOvQuBEEgTQT0dZR+AlfA@public.gmane.org>]

Copy system calls came up during Plumbers a while ago, mostly because several
filesystems (including NFS and XFS) are currently working on copy acceleration
implementations.  We haven't heard from Zach Brown in a while, so I volunteered
to push his patches upstream so individual filesystems don't need to keep
writing their own ioctls.

This posting  fixes up a few minor issues that came up on the mailing list.  I
looked into the O_APPEND question, and do_splice_direct() specificially
disallows files that are open for appending.  I've decided to keep the
no-O_APPEND requirement for now since I use this function for pagecache copies.

Changes in v8:
- Remove redundant checks.
- Make the fdget() / fdput() calls more obvious.
- Document disallowing files open with O_APPEND.

Thanks,
Anna


Anna Schumaker (1):
  vfs: Add vfs_copy_file_range() support for pagecache copies

Zach Brown (3):
  vfs: add copy_file_range syscall and vfs helper
  x86: add sys_copy_file_range to syscall tables
  btrfs: add .copy_file_range file operation

 arch/x86/entry/syscalls/syscall_32.tbl |   1 +
 arch/x86/entry/syscalls/syscall_64.tbl |   1 +
 fs/btrfs/ctree.h                       |   3 +
 fs/btrfs/file.c                        |   1 +
 fs/btrfs/ioctl.c                       |  91 ++++++++++++----------
 fs/read_write.c                        | 135 +++++++++++++++++++++++++++++++++
 include/linux/fs.h                     |   3 +
 include/linux/syscalls.h               |   3 +
 include/uapi/asm-generic/unistd.h      |   4 +-
 kernel/sys_ni.c                        |   1 +
 10 files changed, 203 insertions(+), 40 deletions(-)

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2.6.2