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Linux kernel mirror (for testing)
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linux
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 if (fcntl_notify_flags & DN_MODIFY) {
41 /* What does this mean on directories? */
42 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE |
43 FILE_NOTIFY_CHANGE_SIZE;
44 }
45 if (fcntl_notify_flags & DN_CREATE) {
46 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_CREATION |
47 FILE_NOTIFY_CHANGE_LAST_WRITE;
48 }
49 if (fcntl_notify_flags & DN_DELETE)
50 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_LAST_WRITE;
51 if (fcntl_notify_flags & DN_RENAME) {
52 /* BB review this - checking various server behaviors */
53 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_DIR_NAME |
54 FILE_NOTIFY_CHANGE_FILE_NAME;
55 }
56 if (fcntl_notify_flags & DN_ATTRIB) {
57 cifs_ntfy_flags |= FILE_NOTIFY_CHANGE_SECURITY |
58 FILE_NOTIFY_CHANGE_ATTRIBUTES;
59 }
60/* if (fcntl_notify_flags & DN_MULTISHOT) {
61 cifs_ntfy_flags |= ;
62 } */ /* BB fixme - not sure how to handle this with CIFS yet */
63
64 return cifs_ntfy_flags;
65}
66
67int cifs_dir_notify(struct file *file, unsigned long arg)
68{
69 int xid;
70 int rc = -EINVAL;
71 int oplock = 0;
72 struct cifs_sb_info *cifs_sb;
73 struct cifsTconInfo *pTcon;
74 char *full_path = NULL;
75 __u32 filter = FILE_NOTIFY_CHANGE_NAME | FILE_NOTIFY_CHANGE_ATTRIBUTES;
76 __u16 netfid;
77
78 if (experimEnabled == 0)
79 return 0;
80
81 xid = GetXid();
82 cifs_sb = CIFS_SB(file->f_path.dentry->d_sb);
83 pTcon = cifs_sb->tcon;
84
85 full_path = build_path_from_dentry(file->f_path.dentry);
86
87 if (full_path == NULL) {
88 rc = -ENOMEM;
89 } else {
90 cFYI(1, ("dir notify on file %s Arg 0x%lx", full_path, arg));
91 rc = CIFSSMBOpen(xid, pTcon, full_path, FILE_OPEN,
92 GENERIC_READ | SYNCHRONIZE, 0 /* create options */,
93 &netfid, &oplock, NULL, cifs_sb->local_nls,
94 cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
95 /* BB fixme - add this handle to a notify handle list */
96 if (rc) {
97 cFYI(1, ("Could not open directory for notify"));
98 } else {
99 filter = convert_to_cifs_notify_flags(arg);
100 if (filter != 0) {
101 rc = CIFSSMBNotify(xid, pTcon,
102 0 /* no subdirs */, netfid,
103 filter, file, arg & DN_MULTISHOT,
104 cifs_sb->local_nls);
105 } else {
106 rc = -EINVAL;
107 }
108 /* BB add code to close file eventually (at unmount
109 it would close automatically but may be a way
110 to do it easily when inode freed or when
111 notify info is cleared/changed */
112 cFYI(1, ("notify rc %d", rc));
113 }
114 }
115
116 FreeXid(xid);
117 return rc;
118}