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
|
/*
Unix SMB/CIFS implementation.
POSIX NTVFS backend - xattr support using a tdb
Copyright (C) Andrew Tridgell 2004
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#include "vfs_posix.h"
#define XATTR_LIST_ATTR ".xattr_list"
/*
we need to maintain a list of attributes on each file, so that unlink
can automatically clean them up
*/
static NTSTATUS xattr_tdb_add_list(struct pvfs_state *pvfs, const char *attr_name,
const char *fname, int fd)
{
DATA_BLOB blob;
TALLOC_CTX *mem_ctx;
const char *s;
NTSTATUS status;
size_t len;
if (strcmp(attr_name, XATTR_LIST_ATTR) == 0) {
return NT_STATUS_OK;
}
mem_ctx = talloc_new(pvfs);
status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
fname, fd, 100, &blob);
if (!NT_STATUS_IS_OK(status)) {
blob = data_blob(NULL, 0);
}
for (s=blob.data; s < (char *)(blob.data+blob.length); s += strlen(s) + 1) {
if (strcmp(attr_name, s) == 0) {
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
}
len = strlen(attr_name) + 1;
blob.data = talloc_realloc_p(mem_ctx, blob.data, uint8_t, blob.length + len);
if (blob.data == NULL) {
talloc_free(mem_ctx);
return NT_STATUS_NO_MEMORY;
}
memcpy(blob.data + blob.length, attr_name, len);
blob.length += len;
status = push_xattr_blob_tdb(pvfs, XATTR_LIST_ATTR, fname, fd, &blob);
talloc_free(mem_ctx);
return status;
}
/*
form a key for using in the ea_db
*/
static NTSTATUS get_ea_db_key(TALLOC_CTX *mem_ctx,
const char *attr_name,
const char *fname, int fd,
TDB_DATA *key)
{
struct stat st;
size_t len = strlen(attr_name);
if (fd == -1) {
if (stat(fname, &st) == -1) {
return NT_STATUS_NOT_FOUND;
}
} else {
if (fstat(fd, &st) == -1) {
return NT_STATUS_NOT_FOUND;
}
}
key->dptr = talloc_array_p(mem_ctx, char, 16 + len);
if (key->dptr == NULL) {
return NT_STATUS_NO_MEMORY;
}
key->dsize = 16 + len;
SBVAL(key->dptr, 0, st.st_dev);
SBVAL(key->dptr, 8, st.st_ino);
memcpy(key->dptr+16, attr_name, len);
return NT_STATUS_OK;
}
/*
pull a xattr as a blob, using the ea_db tdb
*/
NTSTATUS pull_xattr_blob_tdb(struct pvfs_state *pvfs,
TALLOC_CTX *mem_ctx,
const char *attr_name,
const char *fname,
int fd,
size_t estimated_size,
DATA_BLOB *blob)
{
TDB_DATA tkey, tdata;
NTSTATUS status;
status = get_ea_db_key(mem_ctx, attr_name, fname, fd, &tkey);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
tdata = tdb_fetch(pvfs->ea_db->tdb, tkey);
if (tdata.dptr == NULL) {
return NT_STATUS_NOT_FOUND;
}
*blob = data_blob_talloc(mem_ctx, tdata.dptr, tdata.dsize);
free(tdata.dptr);
if (blob->data == NULL) {
return NT_STATUS_NO_MEMORY;
}
return NT_STATUS_OK;
}
/*
push a xattr as a blob, using ea_db
*/
NTSTATUS push_xattr_blob_tdb(struct pvfs_state *pvfs,
const char *attr_name,
const char *fname,
int fd,
const DATA_BLOB *blob)
{
TDB_DATA tkey, tdata;
NTSTATUS status;
status = get_ea_db_key(pvfs, attr_name, fname, fd, &tkey);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
tdata.dptr = blob->data;
tdata.dsize = blob->length;
if (tdb_chainlock(pvfs->ea_db->tdb, tkey) != 0) {
talloc_free(tkey.dptr);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
status = xattr_tdb_add_list(pvfs, attr_name, fname, fd);
if (!NT_STATUS_IS_OK(status)) {
goto done;
}
if (tdb_store(pvfs->ea_db->tdb, tkey, tdata, TDB_REPLACE) == -1) {
status = NT_STATUS_INTERNAL_DB_CORRUPTION;
}
done:
tdb_chainunlock(pvfs->ea_db->tdb, tkey);
talloc_free(tkey.dptr);
return status;
}
/*
delete a xattr
*/
NTSTATUS delete_xattr_tdb(struct pvfs_state *pvfs, const char *attr_name,
const char *fname, int fd)
{
TDB_DATA tkey;
NTSTATUS status;
status = get_ea_db_key(NULL, attr_name, fname, fd, &tkey);
if (!NT_STATUS_IS_OK(status)) {
return status;
}
if (tdb_delete(pvfs->ea_db->tdb, tkey) == -1) {
talloc_free(tkey.dptr);
return NT_STATUS_INTERNAL_DB_CORRUPTION;
}
talloc_free(tkey.dptr);
return NT_STATUS_OK;
}
/*
delete all xattrs for a file
*/
NTSTATUS unlink_xattr_tdb(struct pvfs_state *pvfs, const char *fname)
{
TALLOC_CTX *mem_ctx = talloc_new(pvfs);
DATA_BLOB blob;
const char *s;
NTSTATUS status;
status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
fname, -1, 100, &blob);
if (!NT_STATUS_IS_OK(status)) {
talloc_free(mem_ctx);
return NT_STATUS_OK;
}
for (s=blob.data; s < (char *)(blob.data+blob.length); s += strlen(s) + 1) {
delete_xattr_tdb(pvfs, s, fname, -1);
}
return delete_xattr_tdb(pvfs, XATTR_LIST_ATTR, fname, -1);
}
|
