1 /*
2 Unix SMB/CIFS implementation.
3
4 POSIX NTVFS backend - seek
5
6 Copyright (C) Andrew Tridgell 2004
7
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2 of the License, or
11 (at your option) any later version.
12
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
17
18 You should have received a copy of the GNU General Public License
19 along with this program; if not, write to the Free Software
20 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
21 */
22
23 #include "includes.h"
24 #include "vfs_posix.h"
25
26 /*
27 seek in a file
28 */
pvfs_seek(struct ntvfs_module_context * ntvfs,struct ntvfs_request * req,union smb_seek * io)29 NTSTATUS pvfs_seek(struct ntvfs_module_context *ntvfs,
30 struct ntvfs_request *req,
31 union smb_seek *io)
32 {
33 struct pvfs_state *pvfs = ntvfs->private_data;
34 struct pvfs_file *f;
35 struct pvfs_file_handle *h;
36 NTSTATUS status;
37
38 f = pvfs_find_fd(pvfs, req, io->lseek.in.file.ntvfs);
39 if (!f) {
40 return NT_STATUS_INVALID_HANDLE;
41 }
42 h = f->handle;
43
44 status = NT_STATUS_OK;
45
46 switch (io->lseek.in.mode) {
47 case SEEK_MODE_START:
48 h->seek_offset = io->lseek.in.offset;
49 break;
50
51 case SEEK_MODE_CURRENT:
52 h->seek_offset += io->lseek.in.offset;
53 break;
54
55 case SEEK_MODE_END:
56 status = pvfs_resolve_name_fd(pvfs, h->fd, h->name);
57 h->seek_offset = h->name->st.st_size + io->lseek.in.offset;
58 break;
59 }
60
61 io->lseek.out.offset = h->seek_offset;
62
63 return status;
64 }
65
66