path: root/fs/cifs/cifsfs.h
diff options
authorSachin Prabhu <sprabhu@redhat.com>2017-02-10 16:03:51 +0530
committerSteve French <smfrench@gmail.com>2017-04-07 08:04:41 -0500
commit620d8745b35daaf507186c26b40c7ea02aed131e (patch)
treea634c2ac96c3920c979869e66eb28ff032406a51 /fs/cifs/cifsfs.h
parentSMB3: Rename clone_range to copychunk_range (diff)
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 'fs/cifs/cifsfs.h')
1 files changed, 5 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.h b/fs/cifs/cifsfs.h
index da717fee3026..30bf89b1fd9a 100644
--- a/fs/cifs/cifsfs.h
+++ b/fs/cifs/cifsfs.h
@@ -139,6 +139,11 @@ extern ssize_t cifs_listxattr(struct dentry *, char *, size_t);
# define cifs_listxattr NULL
+extern ssize_t cifs_file_copychunk_range(unsigned int xid,
+ struct file *src_file, loff_t off,
+ struct file *dst_file, loff_t destoff,
+ size_t len, unsigned int flags);
extern long cifs_ioctl(struct file *filep, unsigned int cmd, unsigned long arg);
extern const struct export_operations cifs_export_ops;