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} 235