source: branches/samba-3.5.x/source4/ntvfs/posix/xattr_tdb.c

Last change on this file was 414, checked in by Herwig Bauernfeind, 16 years ago

Samba 3.5.0: Initial import
File size: 5.3 KB
Line 
1/*
2 Unix SMB/CIFS implementation.
3
4 POSIX NTVFS backend - xattr support using a tdb
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 3 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, see <http://www.gnu.org/licenses/>.
20*/
21
22#include "includes.h"
23#include "vfs_posix.h"
24#include "../tdb/include/tdb.h"
25#include "tdb_wrap.h"
26
27#define XATTR_LIST_ATTR ".xattr_list"
28
29/*
30 we need to maintain a list of attributes on each file, so that unlink
31 can automatically clean them up
32*/
33static NTSTATUS xattr_tdb_add_list(struct pvfs_state *pvfs, const char *attr_name,
34 const char *fname, int fd)
35{
36 DATA_BLOB blob;
37 TALLOC_CTX *mem_ctx;
38 const char *s;
39 NTSTATUS status;
40 size_t len;
41
42 if (strcmp(attr_name, XATTR_LIST_ATTR) == 0) {
43 return NT_STATUS_OK;
44 }
45
46 mem_ctx = talloc_new(pvfs);
47
48 status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
49 fname, fd, 100, &blob);
50 if (!NT_STATUS_IS_OK(status)) {
51 blob = data_blob(NULL, 0);
52 }
53
54 for (s=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
55 if (strcmp(attr_name, s) == 0) {
56 talloc_free(mem_ctx);
57 return NT_STATUS_OK;
58 }
59 }
60
61 len = strlen(attr_name) + 1;
62
63 blob.data = talloc_realloc(mem_ctx, blob.data, uint8_t, blob.length + len);
64 if (blob.data == NULL) {
65 talloc_free(mem_ctx);
66 return NT_STATUS_NO_MEMORY;
67 }
68 memcpy(blob.data + blob.length, attr_name, len);
69 blob.length += len;
70
71 status = push_xattr_blob_tdb(pvfs, XATTR_LIST_ATTR, fname, fd, &blob);
72 talloc_free(mem_ctx);
73
74 return status;
75}
76
77/*
78 form a key for using in the ea_db
79*/
80static NTSTATUS get_ea_db_key(TALLOC_CTX *mem_ctx,
81 const char *attr_name,
82 const char *fname, int fd,
83 TDB_DATA *key)
84{
85 struct stat st;
86 size_t len = strlen(attr_name);
87
88 if (fd == -1) {
89 if (stat(fname, &st) == -1) {
90 return NT_STATUS_NOT_FOUND;
91 }
92 } else {
93 if (fstat(fd, &st) == -1) {
94 return NT_STATUS_NOT_FOUND;
95 }
96 }
97
98 key->dptr = talloc_array(mem_ctx, uint8_t, 16 + len);
99 if (key->dptr == NULL) {
100 return NT_STATUS_NO_MEMORY;
101 }
102 key->dsize = 16 + len;
103
104 SBVAL(key->dptr, 0, st.st_dev);
105 SBVAL(key->dptr, 8, st.st_ino);
106 memcpy(key->dptr+16, attr_name, len);
107
108 return NT_STATUS_OK;
109}
110
111/*
112 pull a xattr as a blob, using the ea_db tdb
113*/
114NTSTATUS pull_xattr_blob_tdb(struct pvfs_state *pvfs,
115 TALLOC_CTX *mem_ctx,
116 const char *attr_name,
117 const char *fname,
118 int fd,
119 size_t estimated_size,
120 DATA_BLOB *blob)
121{
122 TDB_DATA tkey, tdata;
123 NTSTATUS status;
124
125 status = get_ea_db_key(mem_ctx, attr_name, fname, fd, &tkey);
126 if (!NT_STATUS_IS_OK(status)) {
127 return status;
128 }
129
130 tdata = tdb_fetch(pvfs->ea_db->tdb, tkey);
131 if (tdata.dptr == NULL) {
132 return NT_STATUS_NOT_FOUND;
133 }
134
135 *blob = data_blob_talloc(mem_ctx, tdata.dptr, tdata.dsize);
136 free(tdata.dptr);
137 if (blob->data == NULL) {
138 return NT_STATUS_NO_MEMORY;
139 }
140
141 return NT_STATUS_OK;
142}
143
144/*
145 push a xattr as a blob, using ea_db
146*/
147NTSTATUS push_xattr_blob_tdb(struct pvfs_state *pvfs,
148 const char *attr_name,
149 const char *fname,
150 int fd,
151 const DATA_BLOB *blob)
152{
153 TDB_DATA tkey, tdata;
154 NTSTATUS status;
155
156 status = get_ea_db_key(pvfs, attr_name, fname, fd, &tkey);
157 if (!NT_STATUS_IS_OK(status)) {
158 return status;
159 }
160
161 tdata.dptr = blob->data;
162 tdata.dsize = blob->length;
163
164 if (tdb_chainlock(pvfs->ea_db->tdb, tkey) != 0) {
165 talloc_free(tkey.dptr);
166 return NT_STATUS_INTERNAL_DB_CORRUPTION;
167 }
168
169 status = xattr_tdb_add_list(pvfs, attr_name, fname, fd);
170 if (!NT_STATUS_IS_OK(status)) {
171 goto done;
172 }
173
174 if (tdb_store(pvfs->ea_db->tdb, tkey, tdata, TDB_REPLACE) == -1) {
175 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
176 }
177
178done:
179 tdb_chainunlock(pvfs->ea_db->tdb, tkey);
180 talloc_free(tkey.dptr);
181 return status;
182}
183
184
185/*
186 delete a xattr
187*/
188NTSTATUS delete_xattr_tdb(struct pvfs_state *pvfs, const char *attr_name,
189 const char *fname, int fd)
190{
191 TDB_DATA tkey;
192 NTSTATUS status;
193
194 status = get_ea_db_key(NULL, attr_name, fname, fd, &tkey);
195 if (!NT_STATUS_IS_OK(status)) {
196 return status;
197 }
198
199 if (tdb_delete(pvfs->ea_db->tdb, tkey) == -1) {
200 talloc_free(tkey.dptr);
201 return NT_STATUS_INTERNAL_DB_CORRUPTION;
202 }
203
204 talloc_free(tkey.dptr);
205 return NT_STATUS_OK;
206}
207
208
209
210/*
211 delete all xattrs for a file
212*/
213NTSTATUS unlink_xattr_tdb(struct pvfs_state *pvfs, const char *fname)
214{
215 TALLOC_CTX *mem_ctx = talloc_new(pvfs);
216 DATA_BLOB blob;
217 const char *s;
218 NTSTATUS status;
219
220 status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
221 fname, -1, 100, &blob);
222 if (!NT_STATUS_IS_OK(status)) {
223 talloc_free(mem_ctx);
224 return NT_STATUS_OK;
225 }
226
227 for (s=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
228 delete_xattr_tdb(pvfs, s, fname, -1);
229 }
230
231 status = delete_xattr_tdb(pvfs, XATTR_LIST_ATTR, fname, -1);
232 talloc_free(mem_ctx);
233 return status;
234}
Note: See TracBrowser for help on using the repository browser.