Add reflink copy over SMB3.11 with new FSCTL_DUPLICATE_EXTENTS
Getting fantastic copy performance with cp --reflink over SMB3.11
using the new FSCTL_DUPLICATE_EXTENTS.
This FSCTL was added in the SMB3.11 dialect (testing was
against REFS file system) so have put it as a 3.11 protocol
specific operation ("vers=3.1.1" on the mount). Tested at
the SMB3 plugfest in Redmond.
It depends on the new FS Attribute (BLOCK_REFCOUNTING) which
is used to advertise support for the ability to do this ioctl
(if you can support multiple files pointing to the same block
than this refcounting ability or equivalent is needed to
support the new reflink-like duplicate extent SMB3 ioctl.
Signed-off-by: Steve French <steve.french@primarydata.com>
diff --git a/fs/cifs/ioctl.c b/fs/cifs/ioctl.c
index 8b7898b..7843b19 100644
--- a/fs/cifs/ioctl.c
+++ b/fs/cifs/ioctl.c
@@ -31,12 +31,14 @@
#include "cifsproto.h"
#include "cifs_debug.h"
#include "cifsfs.h"
+#include <linux/btrfs.h>
#define CIFS_IOCTL_MAGIC 0xCF
#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
static long cifs_ioctl_clone(unsigned int xid, struct file *dst_file,
- unsigned long srcfd, u64 off, u64 len, u64 destoff)
+ unsigned long srcfd, u64 off, u64 len, u64 destoff,
+ bool dup_extents)
{
int rc;
struct cifsFileInfo *smb_file_target = dst_file->private_data;
@@ -109,9 +111,14 @@
truncate_inode_pages_range(&target_inode->i_data, destoff,
PAGE_CACHE_ALIGN(destoff + len)-1);
- if (target_tcon->ses->server->ops->clone_range)
+ if (dup_extents && target_tcon->ses->server->ops->duplicate_extents)
+ rc = target_tcon->ses->server->ops->duplicate_extents(xid,
+ smb_file_src, smb_file_target, off, len, destoff);
+ else if (!dup_extents && target_tcon->ses->server->ops->clone_range)
rc = target_tcon->ses->server->ops->clone_range(xid,
smb_file_src, smb_file_target, off, len, destoff);
+ else
+ rc = -EOPNOTSUPP;
/* force revalidate of size and timestamps of target file now
that target is updated on the server */
@@ -205,7 +212,10 @@
}
break;
case CIFS_IOC_COPYCHUNK_FILE:
- rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0);
+ rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, false);
+ break;
+ case BTRFS_IOC_CLONE:
+ rc = cifs_ioctl_clone(xid, filep, arg, 0, 0, 0, true);
break;
default:
cifs_dbg(FYI, "unsupported ioctl\n");