Hi, Anna Schumaker

This patchset compile ok in x86 and x86_64 target,
But failed in arm when compiling btrfs dir, and output following error message:
  <stdin>:1304:2: warning: #warning syscall copy_file_range not implemented [-Wcpp]   

Reproduce:

merge commands:
cd /mnt/big1/linux
git fetch -q --all
git --force -B btrfs_base v4.3-rc5
git am --abort
git am --whitespace=nowarn PATCH_v6_1_4__vfs__add_copy_file_range_syscall_and_vfs_helper
git am --whitespace=nowarn PATCH_v6_2_4__x86__add_sys_copy_file_range_to_syscall_tables
git am --whitespace=nowarn PATCH_v6_3_4__btrfs__add_.copy_file_range_file_operation
git am --whitespace=nowarn PATCH_v6_4_4__vfs__Add_vfs_copy_file_range___support_for_pagecache_copies

compild commands:   
make --directory=/mnt/big1/linux ARCH=arm CROSS_COMPILE=arm-buildroot-linux-uclibcgnueabi- distclean
make --directory=/mnt/big1/linux ARCH=arm CROSS_COMPILE=arm-buildroot-linux-uclibcgnueabi- defconfig
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --module CONFIG_BTRFS_FS   
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --enable CONFIG_BTRFS_FS_POSIX_ACL   
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --enable CONFIG_BTRFS_FS_CHECK_INTEGRITY   
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --enable CONFIG_BTRFS_FS_RUN_SANITY_TESTS   
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --enable CONFIG_BTRFS_DEBUG   
/mnt/big1/linux/scripts/config --file /mnt/big1/linux/.config --enable CONFIG_BTRFS_ASSERT   
make --directory=/mnt/big1/linux ARCH=arm CROSS_COMPILE=arm-buildroot-linux-uclibcgnueabi- -j8 fs/btrfs/   

Thanks
Zhaolei

-----Original Message-----
From: linux-btrfs-owner@vger.kernel.org
[mailto:linux-btrfs-owner@vger.kernel.org] On Behalf Of Anna Schumaker
Sent: Saturday, October 17, 2015 5:08 AM
To: linux-nfs@vger.kernel.org; linux-btrfs@vger.kernel.org;
linux-fsdevel@vger.kernel.org; linux-api@vger.kernel.org; zab@zabbo.net;
viro@zeniv.linux.org.uk; clm@fb.com; darrick.wong@oracle.com;
mtk.manpages@gmail.com; andros@netapp.com; hch@infradead.org
Subject: [PATCH v6 0/4] VFS: In-kernel copy system call

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 adresses Christoph's comments.  I'm pretty sure that splice() is
already interruptible, so I don't know what else needs to be done for this
system call.

I haven't started work on a "sparse" copy flag yet.  I would like to focus on the
base system call first, and then add that later if it's still desired.

Changes in v6:
- Squash together most patches.
- Drop all flags except COPY_FR_REFLINK.
- Drop patch removing same mountpoint check.
- Change default behavior (flags = 0) to a data copy.


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                       |  94 +++++++++++++----------
 fs/read_write.c                        | 133
+++++++++++++++++++++++++++++++++
 include/linux/fs.h                     |   3 +
 include/linux/syscalls.h               |   3 +
 include/uapi/asm-generic/unistd.h      |   4 +-
 include/uapi/linux/fs.h                |   2 +
 kernel/sys_ni.c                        |   1 +
 11 files changed, 206 insertions(+), 40 deletions(-)

--
2.6.1

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