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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 /fs/cifs/cifsfs.h | |
| parent | SMB3: Rename clone_range to copychunk_range (diff) | |
| download | linux-dev-620d8745b35daaf507186c26b40c7ea02aed131e.tar.xz linux-dev-620d8745b35daaf507186c26b40c7ea02aed131e.zip | |
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')
| -rw-r--r-- | fs/cifs/cifsfs.h | 5 |
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 #endif +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); #ifdef CONFIG_CIFS_NFSD_EXPORT extern const struct export_operations cifs_export_ops; |