2 Unix SMB/CIFS implementation.
4 POSIX NTVFS backend - xattr support using a tdb
6 Copyright (C) Andrew Tridgell 2004
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.
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.
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/>.
24 #include "../tdb/include/tdb.h"
25 #include "vfs_posix.h"
27 #define XATTR_LIST_ATTR ".xattr_list"
30 we need to maintain a list of attributes on each file, so that unlink
31 can automatically clean them up
33 static NTSTATUS xattr_tdb_add_list(struct tdb_wrap *ea_tdb, TALLOC_CTX *ctx, const char *attr_name,
34 const char *fname, int fd)
42 if (strcmp(attr_name, XATTR_LIST_ATTR) == 0) {
46 mem_ctx = talloc_new(ctx);
48 status = pull_xattr_blob_tdb_raw(ea_tdb, mem_ctx, XATTR_LIST_ATTR,
49 fname, fd, 100, &blob);
50 if (!NT_STATUS_IS_OK(status)) {
51 blob = data_blob(NULL, 0);
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) {
61 len = strlen(attr_name) + 1;
63 blob.data = talloc_realloc(mem_ctx, blob.data, uint8_t, blob.length + len);
64 if (blob.data == NULL) {
66 return NT_STATUS_NO_MEMORY;
68 memcpy(blob.data + blob.length, attr_name, len);
71 status = push_xattr_blob_tdb_raw(ea_tdb,ctx, XATTR_LIST_ATTR, fname, fd, &blob);
78 form a key for using in the ea_tdb
80 static NTSTATUS get_ea_tdb_key(TALLOC_CTX *mem_ctx,
81 const char *attr_name,
82 const char *fname, int fd,
86 size_t len = strlen(attr_name);
89 if (stat(fname, &st) == -1) {
90 return NT_STATUS_NOT_FOUND;
93 if (fstat(fd, &st) == -1) {
94 return NT_STATUS_NOT_FOUND;
98 key->dptr = talloc_array(mem_ctx, uint8_t, 16 + len);
99 if (key->dptr == NULL) {
100 return NT_STATUS_NO_MEMORY;
102 key->dsize = 16 + len;
104 SBVAL(key->dptr, 0, st.st_dev);
105 SBVAL(key->dptr, 8, st.st_ino);
106 memcpy(key->dptr+16, attr_name, len);
114 pull a xattr as a blob, using the ea_tdb_context tdb
116 NTSTATUS pull_xattr_blob_tdb_raw(struct tdb_wrap *ea_tdb,
118 const char *attr_name,
121 size_t estimated_size,
124 TDB_DATA tkey, tdata;
127 status = get_ea_tdb_key(mem_ctx, attr_name, fname, fd, &tkey);
128 if (!NT_STATUS_IS_OK(status)) {
132 tdata = tdb_fetch(ea_tdb->tdb, tkey);
133 if (tdata.dptr == NULL) {
134 return NT_STATUS_NOT_FOUND;
137 *blob = data_blob_talloc(mem_ctx, tdata.dptr, tdata.dsize);
139 if (blob->data == NULL) {
140 return NT_STATUS_NO_MEMORY;
146 NTSTATUS pull_xattr_blob_tdb(struct pvfs_state *pvfs,
148 const char *attr_name,
151 size_t estimated_size,
154 return pull_xattr_blob_tdb_raw(pvfs->ea_db,mem_ctx,attr_name,fname,fd,estimated_size,blob);
158 push a xattr as a blob, using ea_tdb
160 NTSTATUS push_xattr_blob_tdb_raw(struct tdb_wrap *ea_tdb,
162 const char *attr_name,
165 const DATA_BLOB *blob)
167 TDB_DATA tkey, tdata;
170 status = get_ea_tdb_key(mem_ctx, attr_name, fname, fd, &tkey);
171 if (!NT_STATUS_IS_OK(status)) {
175 tdata.dptr = blob->data;
176 tdata.dsize = blob->length;
178 if (tdb_chainlock(ea_tdb->tdb, tkey) != 0) {
179 talloc_free(tkey.dptr);
180 return NT_STATUS_INTERNAL_DB_CORRUPTION;
183 status = xattr_tdb_add_list(ea_tdb,mem_ctx, attr_name, fname, fd);
184 if (!NT_STATUS_IS_OK(status)) {
188 if (tdb_store(ea_tdb->tdb, tkey, tdata, TDB_REPLACE) == -1) {
189 status = NT_STATUS_INTERNAL_DB_CORRUPTION;
193 tdb_chainunlock(ea_tdb->tdb, tkey);
194 talloc_free(tkey.dptr);
197 NTSTATUS push_xattr_blob_tdb(struct pvfs_state *pvfs,
198 const char *attr_name,
201 const DATA_BLOB *blob)
203 return push_xattr_blob_tdb_raw(pvfs->ea_db,pvfs,attr_name,fname,fd,blob);
210 NTSTATUS delete_xattr_tdb(struct pvfs_state *pvfs, const char *attr_name,
211 const char *fname, int fd)
216 status = get_ea_tdb_key(NULL, attr_name, fname, fd, &tkey);
217 if (!NT_STATUS_IS_OK(status)) {
221 if (tdb_delete(pvfs->ea_db->tdb, tkey) == -1) {
222 talloc_free(tkey.dptr);
223 return NT_STATUS_INTERNAL_DB_CORRUPTION;
226 talloc_free(tkey.dptr);
233 delete all xattrs for a file
235 NTSTATUS unlink_xattr_tdb(struct pvfs_state *pvfs, const char *fname)
237 TALLOC_CTX *mem_ctx = talloc_new(pvfs);
242 status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
243 fname, -1, 100, &blob);
244 if (!NT_STATUS_IS_OK(status)) {
245 talloc_free(mem_ctx);
249 for (s=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
250 delete_xattr_tdb(pvfs, s, fname, -1);
253 status = delete_xattr_tdb(pvfs, XATTR_LIST_ATTR, fname, -1);
254 talloc_free(mem_ctx);