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/*
* Module to make use of awesome Btrfs features
*
* Copyright (C) David Disseldorp 2011-2013
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/ioctl.h>
#include <sys/ioctl.h>
#include "includes.h"
#include "system/filesys.h"
#include "smbd/smbd.h"
#include "../librpc/gen_ndr/smbXsrv.h"
#include "lib/util/tevent_ntstatus.h"
struct btrfs_ioctl_clone_range_args {
int64_t src_fd;
uint64_t src_offset;
uint64_t src_length;
uint64_t dest_offset;
};
#define BTRFS_IOCTL_MAGIC 0x94
#define BTRFS_IOC_CLONE_RANGE _IOW(BTRFS_IOCTL_MAGIC, 13, \
struct btrfs_ioctl_clone_range_args)
struct btrfs_cc_state {
struct vfs_handle_struct *handle;
off_t copied;
struct tevent_req *subreq; /* non-null if passed to next VFS fn */
};
static void btrfs_copy_chunk_done(struct tevent_req *subreq);
static struct tevent_req *btrfs_copy_chunk_send(struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct files_struct *src_fsp,
off_t src_off,
struct files_struct *dest_fsp,
off_t dest_off,
off_t num)
{
struct tevent_req *req;
struct btrfs_cc_state *cc_state;
struct btrfs_ioctl_clone_range_args cr_args;
struct lock_struct src_lck;
struct lock_struct dest_lck;
int ret;
NTSTATUS status;
req = tevent_req_create(mem_ctx, &cc_state, struct btrfs_cc_state);
if (req == NULL) {
return NULL;
}
cc_state->handle = handle;
status = vfs_stat_fsp(src_fsp);
if (tevent_req_nterror(req, status)) {
return tevent_req_post(req, ev);
}
if (src_fsp->fsp_name->st.st_ex_size < src_off + num) {
/* [MS-SMB2] Handling a Server-Side Data Copy Request */
tevent_req_nterror(req, NT_STATUS_INVALID_VIEW_SIZE);
return tevent_req_post(req, ev);
}
init_strict_lock_struct(src_fsp,
src_fsp->op->global->open_persistent_id,
src_off,
num,
READ_LOCK,
&src_lck);
init_strict_lock_struct(dest_fsp,
dest_fsp->op->global->open_persistent_id,
dest_off,
num,
WRITE_LOCK,
&dest_lck);
if (!SMB_VFS_STRICT_LOCK(src_fsp->conn, src_fsp, &src_lck)) {
tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
return tevent_req_post(req, ev);
}
if (!SMB_VFS_STRICT_LOCK(dest_fsp->conn, dest_fsp, &dest_lck)) {
SMB_VFS_STRICT_UNLOCK(src_fsp->conn, src_fsp, &src_lck);
tevent_req_nterror(req, NT_STATUS_FILE_LOCK_CONFLICT);
return tevent_req_post(req, ev);
}
ZERO_STRUCT(cr_args);
cr_args.src_fd = src_fsp->fh->fd;
cr_args.src_offset = (uint64_t)src_off;
cr_args.dest_offset = (uint64_t)dest_off;
cr_args.src_length = (uint64_t)num;
ret = ioctl(dest_fsp->fh->fd, BTRFS_IOC_CLONE_RANGE, &cr_args);
SMB_VFS_STRICT_UNLOCK(src_fsp->conn, src_fsp, &dest_lck);
SMB_VFS_STRICT_UNLOCK(src_fsp->conn, src_fsp, &src_lck);
if (ret < 0) {
/*
* BTRFS_IOC_CLONE_RANGE only supports 'sectorsize' aligned
* cloning. Which is 4096 by default, therefore fall back to
* manual read/write on failure.
*/
DEBUG(5, ("BTRFS_IOC_CLONE_RANGE failed: %s, length %llu, "
"src fd: %lld off: %llu, dest fd: %d off: %llu\n",
strerror(errno),
(unsigned long long)cr_args.src_length,
(long long)cr_args.src_fd,
(unsigned long long)cr_args.src_offset,
dest_fsp->fh->fd,
(unsigned long long)cr_args.dest_offset));
cc_state->subreq = SMB_VFS_NEXT_COPY_CHUNK_SEND(handle,
cc_state, ev,
src_fsp,
src_off,
dest_fsp,
dest_off, num);
if (tevent_req_nomem(cc_state->subreq, req)) {
return tevent_req_post(req, ev);
}
/* wait for subreq completion */
tevent_req_set_callback(cc_state->subreq,
btrfs_copy_chunk_done,
req);
return req;
}
DEBUG(5, ("BTRFS_IOC_CLONE_RANGE returned %d\n", ret));
/* BTRFS_IOC_CLONE_RANGE is all or nothing */
cc_state->copied = num;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
/* only used if the request is passed through to next VFS module */
static void btrfs_copy_chunk_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct btrfs_cc_state *cc_state = tevent_req_data(req,
struct btrfs_cc_state);
NTSTATUS status;
status = SMB_VFS_NEXT_COPY_CHUNK_RECV(cc_state->handle,
cc_state->subreq,
&cc_state->copied);
if (tevent_req_nterror(req, status)) {
return;
}
tevent_req_done(req);
}
static NTSTATUS btrfs_copy_chunk_recv(struct vfs_handle_struct *handle,
struct tevent_req *req,
off_t *copied)
{
NTSTATUS status;
struct btrfs_cc_state *cc_state = tevent_req_data(req,
struct btrfs_cc_state);
if (tevent_req_is_nterror(req, &status)) {
DEBUG(4, ("server side copy chunk failed: %s\n",
nt_errstr(status)));
tevent_req_received(req);
return status;
}
DEBUG(10, ("server side copy chunk copied %llu\n",
(unsigned long long)cc_state->copied));
*copied = cc_state->copied;
tevent_req_received(req);
return NT_STATUS_OK;
}
static struct vfs_fn_pointers btrfs_fns = {
.copy_chunk_send_fn = btrfs_copy_chunk_send,
.copy_chunk_recv_fn = btrfs_copy_chunk_recv,
};
NTSTATUS vfs_btrfs_init(void);
NTSTATUS vfs_btrfs_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
"btrfs", &btrfs_fns);
}
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