1/*
2 *   fs/cifs/fcntl.c
3 *
4 *   vfs operations that deal with the file control API
5 *
6 *   Copyright (C) International Business Machines  Corp., 2003,2004
7 *   Author(s): Steve French (sfrench@us.ibm.com)
8 *
9 *   This library is free software; you can redistribute it and/or modify
10 *   it under the terms of the GNU Lesser General Public License as published
11 *   by the Free Software Foundation; either version 2.1 of the License, or
12 *   (at your option) any later version.
13 *
14 *   This library is distributed in the hope that it will be useful,
15 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
16 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
17 *   the GNU Lesser General Public License for more details.
18 *
19 *   You should have received a copy of the GNU Lesser General Public License
20 *   along with this library; if not, write to the Free Software
21 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23#include <linux/fs.h>
24#include <linux/stat.h>
25#include <linux/fcntl.h>
26#include "cifsglob.h"
27#include "cifsproto.h"
28#include "cifs_unicode.h"
29#include "cifs_debug.h"
30#include "cifsfs.h"
31
32static __u32 convert_to_cifs_notify_flags(unsigned long fcntl_notify_flags)
33{
34	__u32 cifs_ntfy_flags = 0;
35
36	/* No way on Linux VFS to ask to monitor xattr
37	changes (and no stream support either */
38	if (fcntl_notify_flags & DN_ACCESS) {
39		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_ACCESS;
40	}
41	if (fcntl_notify_flags & DN_MODIFY) {
42		/* What does this mean on directories? */
43		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE |
44			FILE_NOTIFY_CHANGE_SIZE;
45	}
46	if (fcntl_notify_flags & DN_CREATE) {
47		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_CREATION |
48			FILE_NOTIFY_CHANGE_LAST_WRITE;
49	}
50	if (fcntl_notify_flags & DN_DELETE) {
51		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE;
52	}
53	if (fcntl_notify_flags & DN_RENAME) {
54		/* BB review this - checking various server behaviors */
55		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_DIR_NAME |
56			FILE_NOTIFY_CHANGE_FILE_NAME;
57	}
58	if (fcntl_notify_flags & DN_ATTRIB) {
59		cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_SECURITY |
60			FILE_NOTIFY_CHANGE_ATTRIBUTES;
61	}
62/*	if (fcntl_notify_flags & DN_MULTISHOT) {
63		cifs_ntfy_flags |= ;
64	} */
65
66	return cifs_ntfy_flags;
67}
68
69int cifs_dir_notify(struct file * file, unsigned long arg)
70{
71	int xid;
72	int rc = -EINVAL;
73	int oplock = FALSE;
74	struct cifs_sb_info *cifs_sb;
75	struct cifsTconInfo *pTcon;
76	char *full_path = NULL;
77	__u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
78	__u16 netfid;
79
80	if (experimEnabled == 0)
81		return 0;
82
83	xid = GetXid();
84	cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
85	pTcon = cifs_sb->tcon;
86
87	full_path = build_path_from_dentry(file->f_path.dentry);
88
89	if (full_path == NULL) {
90		rc = -ENOMEM;
91	} else {
92		cFYI(1, ("dir notify on file %s Arg 0x%lx", full_path, arg));
93		rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
94			GENERIC_READ | SYNCHRONIZE, 0 /* create options */,
95			&netfid, &oplock, NULL, cifs_sb->local_nls,
96			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
97		if (rc) {
98			cFYI(1, ("Could not open directory for notify"));
99		} else {
100			filter = convert_to_cifs_notify_flags(arg);
101			if (filter != 0) {
102				rc = CIFSSMBNotify(xid, pTcon,
103					0 /* no subdirs */, netfid,
104					filter, file, arg & DN_MULTISHOT,
105					cifs_sb->local_nls);
106			} else {
107				rc = -EINVAL;
108			}
109			/* BB add code to close file eventually (at unmount
110			it would close automatically but may be a way
111			to do it easily when inode freed or when
112			notify info is cleared/changed */
113			cFYI(1, ("notify rc %d", rc));
114		}
115	}
116
117	FreeXid(xid);
118	return rc;
119}
120