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/*
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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "vfs_posix.h"
#include "lib/tdb/include/tdb.h"
#include "db_wrap.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=(const char *)blob.data; s < (const 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(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(mem_ctx, uint8_t, 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=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
delete_xattr_tdb(pvfs, s, fname, -1);
}
status = delete_xattr_tdb(pvfs, XATTR_LIST_ATTR, fname, -1);
talloc_free(mem_ctx);
return status;
}
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