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| author | Sachin Prabhu <sprabhu@redhat.com> | 2017-02-10 16:03:51 +0530 |
|---|---|---|
| committer | Steve French <smfrench@gmail.com> | 2017-04-07 08:04:41 -0500 |
| commit | 620d8745b35daaf507186c26b40c7ea02aed131e (patch) | |
| tree | a634c2ac96c3920c979869e66eb28ff032406a51 /kernel | |
| parent | 312bbc5946c4b73dfc1d64c1dd5b0f9df8016587 (diff) | |
| download | linux-620d8745b35daaf507186c26b40c7ea02aed131e.tar.bz2 | |
Introduce cifs_copy_file_range()
The earlier changes to copy range for cifs unintentionally disabled the more
common form of server side copy.
The patch introduces the file_operations helper cifs_copy_file_range()
which is used by the syscall copy_file_range. The new file operations
helper allows us to perform server side copies for SMB2.0 and 2.1
servers as well as SMB 3.0+ servers which do not support the ioctl
FSCTL_DUPLICATE_EXTENTS_TO_FILE.
The new helper uses the ioctl FSCTL_SRV_COPYCHUNK_WRITE to perform
server side copies. The helper is called by vfs_copy_file_range() only
once an attempt to clone the file using the ioctl
FSCTL_DUPLICATE_EXTENTS_TO_FILE has failed.
Signed-off-by: Sachin Prabhu <sprabhu@redhat.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
CC: Stable <stable@vger.kernel.org>
Signed-off-by: Steve French <smfrench@gmail.com>
Diffstat (limited to 'kernel')
0 files changed, 0 insertions, 0 deletions