aboutsummaryrefslogtreecommitdiffstats
path: root/fs/cifs/xattr.c
blob: 3938444d87b29d557ceaaffeb5f5430421b030e2 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
/*
 *   fs/cifs/xattr.c
 *
 *   Copyright (c) International Business Machines  Corp., 2003
 *   Author(s): Steve French (sfrench@us.ibm.com)
 *
 *   This library is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU Lesser General Public License as published
 *   by the Free Software Foundation; either version 2.1 of the License, or
 *   (at your option) any later version.
 *
 *   This library 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 Lesser General Public License for more details.
 *
 *   You should have received a copy of the GNU Lesser General Public License
 *   along with this library; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */

#include <linux/fs.h>
#include <linux/posix_acl_xattr.h>
#include "cifsfs.h"
#include "cifspdu.h"
#include "cifsglob.h"
#include "cifsproto.h"
#include "cifs_debug.h"

#define MAX_EA_VALUE_SIZE 65535
#define CIFS_XATTR_DOS_ATTRIB "user.DosAttrib"
#define CIFS_XATTR_USER_PREFIX "user."
#define CIFS_XATTR_SYSTEM_PREFIX "system."
#define CIFS_XATTR_OS2_PREFIX "os2."
#define CIFS_XATTR_SECURITY_PREFIX ".security"
#define CIFS_XATTR_TRUSTED_PREFIX "trusted."
#define XATTR_TRUSTED_PREFIX_LEN  8
#define XATTR_SECURITY_PREFIX_LEN 9
/* BB need to add server (Samba e.g) support for security and trusted prefix */
  


int cifs_removexattr(struct dentry * direntry, const char * ea_name)
{
	int rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct super_block * sb;
	char * full_path;
                                                                                     
	if(direntry == NULL)
		return -EIO;
	if(direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if(sb == NULL)
		return -EIO;
	xid = GetXid();
                                                                                     
	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;
                                                                                     
	mutex_lock(&sb->s_vfs_rename_mutex);
	full_path = build_path_from_dentry(direntry);
	mutex_unlock(&sb->s_vfs_rename_mutex);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	if(ea_name == NULL) {
		cFYI(1,("Null xattr names not supported"));
	} else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5)
		&& (strncmp(ea_name,CIFS_XATTR_OS2_PREFIX,4))) {
		cFYI(1,("illegal xattr namespace %s (only user namespace supported)",ea_name));
		/* BB what if no namespace prefix? */
		/* Should we just pass them to server, except for
		system and perhaps security prefixes? */
	} else {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto remove_ea_exit;

		ea_name+=5; /* skip past user. prefix */
		rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,NULL,
			(__u16)0, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	}
remove_ea_exit:
	kfree(full_path);
	FreeXid(xid);
#endif
	return rc;
}

int cifs_setxattr(struct dentry * direntry, const char * ea_name,
        const void * ea_value, size_t value_size, int flags)
{
	int rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct super_block * sb;
	char * full_path;

	if(direntry == NULL)
		return -EIO;
	if(direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if(sb == NULL)
		return -EIO;
	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	mutex_lock(&sb->s_vfs_rename_mutex);
	full_path = build_path_from_dentry(direntry);
	mutex_unlock(&sb->s_vfs_rename_mutex);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to 
		returns as xattrs */
	if(value_size > MAX_EA_VALUE_SIZE) {
		cFYI(1,("size of EA value too large"));
		kfree(full_path);
		FreeXid(xid);
		return -EOPNOTSUPP;
	}

	if(ea_name == NULL) {
		cFYI(1,("Null xattr names not supported"));
	} else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;
		if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
			cFYI(1,("attempt to set cifs inode metadata"));
		}
		ea_name += 5; /* skip past user. prefix */
		rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
			(__u16)value_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto set_ea_exit;

		ea_name += 4; /* skip past os2. prefix */
		rc = CIFSSMBSetEA(xid,pTcon,full_path,ea_name,ea_value,
			(__u16)value_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else {
		int temp; 
		temp = strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
			strlen(POSIX_ACL_XATTR_ACCESS));
		if (temp == 0) {
#ifdef CONFIG_CIFS_POSIX
			if(sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
					ea_value, (const int)value_size, 
					ACL_TYPE_ACCESS,cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cFYI(1,("set POSIX ACL rc %d",rc));
#else
			cFYI(1,("set POSIX ACL not supported"));
#endif
		} else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
			if(sb->s_flags & MS_POSIXACL)
				rc = CIFSSMBSetPosixACL(xid, pTcon,full_path,
					ea_value, (const int)value_size, 
					ACL_TYPE_DEFAULT, cifs_sb->local_nls,
					cifs_sb->mnt_cifs_flags & 
						CIFS_MOUNT_MAP_SPECIAL_CHR);
			cFYI(1,("set POSIX default ACL rc %d",rc));
#else
			cFYI(1,("set default POSIX ACL not supported"));
#endif
		} else {
			cFYI(1,("illegal xattr request %s (only user namespace supported)",ea_name));
		  /* BB what if no namespace prefix? */
		  /* Should we just pass them to server, except for 
		  system and perhaps security prefixes? */
		}
	}

set_ea_exit:
	kfree(full_path);
	FreeXid(xid);
#endif
	return rc;
}

ssize_t cifs_getxattr(struct dentry * direntry, const char * ea_name,
         void * ea_value, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct super_block * sb;
	char * full_path;

	if(direntry == NULL)
		return -EIO;
	if(direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if(sb == NULL)
		return -EIO;

	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	mutex_lock(&sb->s_vfs_rename_mutex);
	full_path = build_path_from_dentry(direntry);
	mutex_unlock(&sb->s_vfs_rename_mutex);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */
	if(ea_name == NULL) {
		cFYI(1,("Null xattr names not supported"));
	} else if(strncmp(ea_name,CIFS_XATTR_USER_PREFIX,5) == 0) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		if(strncmp(ea_name,CIFS_XATTR_DOS_ATTRIB,14) == 0) {
			cFYI(1,("attempt to query cifs inode metadata"));
			/* revalidate/getattr then populate from inode */
		} /* BB add else when above is implemented */
		ea_name += 5; /* skip past user. prefix */
		rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if(strncmp(ea_name, CIFS_XATTR_OS2_PREFIX,4) == 0) {
		if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_NO_XATTR)
			goto get_ea_exit;

		ea_name += 4; /* skip past os2. prefix */
		rc = CIFSSMBQueryEA(xid,pTcon,full_path,ea_name,ea_value,
			buf_size, cifs_sb->local_nls,
			cifs_sb->mnt_cifs_flags & CIFS_MOUNT_MAP_SPECIAL_CHR);
	} else if(strncmp(ea_name,POSIX_ACL_XATTR_ACCESS,
			  strlen(POSIX_ACL_XATTR_ACCESS)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if(sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_ACCESS, 
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
/*		else if(cifs_sb->mnt_cifs_flags & CIFS_MOUNT_CIFS_ACL) {
			__u16 fid;
			int oplock = FALSE;
			rc = CIFSSMBOpen(xid, pTcon, full_path,
					 FILE_OPEN, GENERIC_READ, 0, &fid,
					 &oplock, NULL, cifs_sb->local_nls,
					 cifs_sb->mnt_cifs_flags &
					 CIFS_MOUNT_MAP_SPECIAL_CHR);
			if(rc == 0) {
				rc = CIFSSMBGetCIFSACL(xid, pTcon, fid,
					ea_value, buf_size,
					ACL_TYPE_ACCESS);
				CIFSSMBClose(xid, pTcon, fid)
			}
		} */  /* BB enable after fixing up return data */
                  		
#else 
		cFYI(1,("query POSIX ACL not supported yet"));
#endif /* CONFIG_CIFS_POSIX */
	} else if(strncmp(ea_name,POSIX_ACL_XATTR_DEFAULT,
			  strlen(POSIX_ACL_XATTR_DEFAULT)) == 0) {
#ifdef CONFIG_CIFS_POSIX
		if(sb->s_flags & MS_POSIXACL)
			rc = CIFSSMBGetPosixACL(xid, pTcon, full_path,
				ea_value, buf_size, ACL_TYPE_DEFAULT, 
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);
#else 
		cFYI(1,("query POSIX default ACL not supported yet"));
#endif
	} else if(strncmp(ea_name,
		  CIFS_XATTR_TRUSTED_PREFIX,XATTR_TRUSTED_PREFIX_LEN) == 0) {
		cFYI(1,("Trusted xattr namespace not supported yet"));
	} else if(strncmp(ea_name,
		  CIFS_XATTR_SECURITY_PREFIX,XATTR_SECURITY_PREFIX_LEN) == 0) {
		cFYI(1,("Security xattr namespace not supported yet"));
	} else {
		cFYI(1,("illegal xattr name request %s (only user namespace supported)",ea_name));
	}

	/* We could add an additional check for streams ie 
	    if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to 
		returns as xattrs */

	if(rc == -EINVAL)
		rc = -EOPNOTSUPP; 

get_ea_exit:
	kfree(full_path);
	FreeXid(xid);
#endif
	return rc;
}

ssize_t cifs_listxattr(struct dentry * direntry, char * data, size_t buf_size)
{
	ssize_t rc = -EOPNOTSUPP;
#ifdef CONFIG_CIFS_XATTR
	int xid;
	struct cifs_sb_info *cifs_sb;
	struct cifsTconInfo *pTcon;
	struct super_block * sb;
	char * full_path;

	if(direntry == NULL)
		return -EIO;
	if(direntry->d_inode == NULL)
		return -EIO;
	sb = direntry->d_inode->i_sb;
	if(sb == NULL)
		return -EIO;
	xid = GetXid();

	cifs_sb = CIFS_SB(sb);
	pTcon = cifs_sb->tcon;

	mutex_lock(&sb->s_vfs_rename_mutex);
	full_path = build_path_from_dentry(direntry);
	mutex_unlock(&sb->s_vfs_rename_mutex);
	if(full_path == NULL) {
		FreeXid(xid);
		return -ENOMEM;
	}
	/* return dos attributes as pseudo xattr */
	/* return alt name if available as pseudo attr */

	/* if proc/fs/cifs/streamstoxattr is set then
		search server for EAs or streams to 
		returns as xattrs */
	rc = CIFSSMBQAllEAs(xid,pTcon,full_path,data,buf_size,
				cifs_sb->local_nls,
				cifs_sb->mnt_cifs_flags & 
					CIFS_MOUNT_MAP_SPECIAL_CHR);

	kfree(full_path);
	FreeXid(xid);
#endif
	return rc;
}