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src/cloner: add CIFS_IOC_COPYCHUNK_FILE support

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cifs.ko supports server-side copy offloads via CIFS_IOC_COPYCHUNK_FILE.
In handling the ioctl, the request is split into a series of
SMB2 FSCTL_SRV_COPYCHUNK wire requests, which may be handled by the SMB
server as a local read/write, or COW clone as is the case for Samba with
vfs_btrfs.

Signed-off-by: David Disseldorp <ddiss@suse.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
David Disseldorp
2014-06-18 09:32:59 +10:00
committed by Dave Chinner
parent c79bb5c641
commit f8c880df31
2 changed files with 68 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files
configure.ac
+1
View File
@@ -31,6 +31,7 @@ AC_HEADER_STDC
sys/fs/xfs_itable.h \
xfs/platform_defs.h \
btrfs/ioctl.h \
cifs/ioctl.h \
])
AC_CHECK_HEADERS([xfs/xfs_log_format.h],,,[#include <xfs/libxfs.h>])
src/cloner.c
+67 -11
View File
@@ -1,6 +1,5 @@
/*
* Tiny program to perform file (range) clones using raw Btrfs ioctls.
* It should only be needed until btrfs-progs has an xfs_io equivalent.
* Tiny program to perform file (range) clones using raw Btrfs and CIFS ioctls.
*
* Copyright (C) 2014 SUSE Linux Products GmbH. All Rights Reserved.
*
@@ -49,9 +48,21 @@ struct btrfs_ioctl_clone_range_args {
struct btrfs_ioctl_clone_range_args)
#endif
#ifdef HAVE_CIFS_IOCTL_H
#include <cifs/ioctl.h>
#else
#define CIFS_IOCTL_MAGIC 0xCF
#define CIFS_IOC_COPYCHUNK_FILE _IOW(CIFS_IOCTL_MAGIC, 3, int)
#endif
#ifndef BTRFS_SUPER_MAGIC
#define BTRFS_SUPER_MAGIC 0x9123683E
#endif
#ifndef CIFS_MAGIC_NUMBER
#define CIFS_MAGIC_NUMBER 0xFE534D42
#endif
static void
usage(char *name, const char *msg)
@@ -59,17 +70,19 @@ usage(char *name, const char *msg)
printf("Fatal: %s\n"
"Usage:\n"
"%s [options] <src_file> <dest_file>\n"
"\tA full file clone (reflink) is performed by default, "
"unless any of the following are specified:\n"
"\tA full file clone is performed by default, "
"unless any of the following are specified (Btrfs only):\n"
"\t-s <offset>: source file offset (default = 0)\n"
"\t-d <offset>: destination file offset (default = 0)\n"
"\t-l <length>: length of clone (default = 0)\n",
"\t-l <length>: length of clone (default = 0)\n\n"
"\tBoth Btrfs and CIFS are supported. On Btrfs, a COW clone "
"is attempted. On CIFS, a server-side copy is requested.\n",
msg, name);
_exit(1);
}
static int
clone_file(int src_fd, int dst_fd)
clone_file_btrfs(int src_fd, int dst_fd)
{
int ret = ioctl(dst_fd, BTRFS_IOC_CLONE, src_fd);
if (ret != 0)
@@ -78,8 +91,33 @@ clone_file(int src_fd, int dst_fd)
}
static int
clone_file_range(int src_fd, int dst_fd, uint64_t src_off, uint64_t dst_off,
uint64_t len)
clone_file_cifs(int src_fd, int dst_fd)
{
int ret = ioctl(dst_fd, CIFS_IOC_COPYCHUNK_FILE, src_fd);
if (ret != 0)
ret = errno;
return ret;
}
static int
clone_file(unsigned int fs_type, int src_fd, int dst_fd)
{
switch (fs_type) {
case BTRFS_SUPER_MAGIC:
return clone_file_btrfs(src_fd, dst_fd);
break;
case CIFS_MAGIC_NUMBER:
return clone_file_cifs(src_fd, dst_fd);
break;
default:
return ENOTSUP;
break;
}
}
static int
clone_file_range_btrfs(int src_fd, int dst_fd, uint64_t src_off,
uint64_t dst_off, uint64_t len)
{
struct btrfs_ioctl_clone_range_args cr_args;
int ret;
@@ -95,6 +133,22 @@ clone_file_range(int src_fd, int dst_fd, uint64_t src_off, uint64_t dst_off,
return ret;
}
static int
clone_file_range(unsigned int fs_type, int src_fd, int dst_fd, uint64_t src_off,
uint64_t dst_off, uint64_t len)
{
switch (fs_type) {
case BTRFS_SUPER_MAGIC:
return clone_file_range_btrfs(src_fd, dst_fd, src_off, dst_off,
len);
break;
case CIFS_MAGIC_NUMBER: /* only supports full file server-side copies */
default:
return ENOTSUP;
break;
}
}
static int
cloner_check_fs_support(int src_fd, int dest_fd, unsigned int *fs_type)
{
@@ -107,7 +161,8 @@ cloner_check_fs_support(int src_fd, int dest_fd, unsigned int *fs_type)
return errno;
}
if (sfs.f_type != BTRFS_SUPER_MAGIC) {
if ((sfs.f_type != BTRFS_SUPER_MAGIC)
&& (sfs.f_type != CIFS_MAGIC_NUMBER)) {
printf("unsupported source FS 0x%x\n",
(unsigned int)sfs.f_type);
return ENOTSUP;
@@ -210,9 +265,10 @@ main(int argc, char **argv)
}
if (full_file) {
ret = clone_file(src_fd, dst_fd);
ret = clone_file(fs_type, src_fd, dst_fd);
} else {
ret = clone_file_range(src_fd, dst_fd, src_off, dst_off, len);
ret = clone_file_range(fs_type, src_fd, dst_fd, src_off,
dst_off, len);
}
if (ret != 0) {
printf("clone failed: %s\n", strerror(ret));