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235 lines
5.3 KiB
C
235 lines
5.3 KiB
C
/*
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Unix SMB/CIFS implementation.
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POSIX NTVFS backend - xattr support using a tdb
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Copyright (C) Andrew Tridgell 2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "vfs_posix.h"
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#include "../tdb/include/tdb.h"
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#include "tdb_wrap.h"
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#define XATTR_LIST_ATTR ".xattr_list"
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/*
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we need to maintain a list of attributes on each file, so that unlink
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can automatically clean them up
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*/
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static NTSTATUS xattr_tdb_add_list(struct pvfs_state *pvfs, const char *attr_name,
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const char *fname, int fd)
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{
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DATA_BLOB blob;
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TALLOC_CTX *mem_ctx;
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const char *s;
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NTSTATUS status;
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size_t len;
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if (strcmp(attr_name, XATTR_LIST_ATTR) == 0) {
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return NT_STATUS_OK;
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}
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mem_ctx = talloc_new(pvfs);
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status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
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fname, fd, 100, &blob);
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if (!NT_STATUS_IS_OK(status)) {
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blob = data_blob(NULL, 0);
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}
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for (s=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
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if (strcmp(attr_name, s) == 0) {
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talloc_free(mem_ctx);
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return NT_STATUS_OK;
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}
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}
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len = strlen(attr_name) + 1;
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blob.data = talloc_realloc(mem_ctx, blob.data, uint8_t, blob.length + len);
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if (blob.data == NULL) {
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talloc_free(mem_ctx);
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return NT_STATUS_NO_MEMORY;
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}
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memcpy(blob.data + blob.length, attr_name, len);
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blob.length += len;
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status = push_xattr_blob_tdb(pvfs, XATTR_LIST_ATTR, fname, fd, &blob);
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talloc_free(mem_ctx);
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return status;
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}
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/*
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form a key for using in the ea_db
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*/
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static NTSTATUS get_ea_db_key(TALLOC_CTX *mem_ctx,
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const char *attr_name,
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const char *fname, int fd,
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TDB_DATA *key)
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{
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struct stat st;
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size_t len = strlen(attr_name);
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if (fd == -1) {
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if (stat(fname, &st) == -1) {
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return NT_STATUS_NOT_FOUND;
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}
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} else {
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if (fstat(fd, &st) == -1) {
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return NT_STATUS_NOT_FOUND;
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}
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}
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key->dptr = talloc_array(mem_ctx, uint8_t, 16 + len);
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if (key->dptr == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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key->dsize = 16 + len;
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SBVAL(key->dptr, 0, st.st_dev);
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SBVAL(key->dptr, 8, st.st_ino);
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memcpy(key->dptr+16, attr_name, len);
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return NT_STATUS_OK;
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}
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/*
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pull a xattr as a blob, using the ea_db tdb
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*/
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NTSTATUS pull_xattr_blob_tdb(struct pvfs_state *pvfs,
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TALLOC_CTX *mem_ctx,
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const char *attr_name,
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const char *fname,
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int fd,
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size_t estimated_size,
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DATA_BLOB *blob)
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{
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TDB_DATA tkey, tdata;
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NTSTATUS status;
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status = get_ea_db_key(mem_ctx, attr_name, fname, fd, &tkey);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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tdata = tdb_fetch(pvfs->ea_db->tdb, tkey);
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if (tdata.dptr == NULL) {
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return NT_STATUS_NOT_FOUND;
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}
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*blob = data_blob_talloc(mem_ctx, tdata.dptr, tdata.dsize);
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free(tdata.dptr);
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if (blob->data == NULL) {
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return NT_STATUS_NO_MEMORY;
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}
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return NT_STATUS_OK;
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}
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/*
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push a xattr as a blob, using ea_db
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*/
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NTSTATUS push_xattr_blob_tdb(struct pvfs_state *pvfs,
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const char *attr_name,
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const char *fname,
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int fd,
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const DATA_BLOB *blob)
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{
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TDB_DATA tkey, tdata;
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NTSTATUS status;
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status = get_ea_db_key(pvfs, attr_name, fname, fd, &tkey);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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tdata.dptr = blob->data;
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tdata.dsize = blob->length;
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if (tdb_chainlock(pvfs->ea_db->tdb, tkey) != 0) {
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talloc_free(tkey.dptr);
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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status = xattr_tdb_add_list(pvfs, attr_name, fname, fd);
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if (!NT_STATUS_IS_OK(status)) {
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goto done;
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}
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if (tdb_store(pvfs->ea_db->tdb, tkey, tdata, TDB_REPLACE) == -1) {
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status = NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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done:
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tdb_chainunlock(pvfs->ea_db->tdb, tkey);
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talloc_free(tkey.dptr);
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return status;
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}
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/*
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delete a xattr
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*/
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NTSTATUS delete_xattr_tdb(struct pvfs_state *pvfs, const char *attr_name,
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const char *fname, int fd)
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{
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TDB_DATA tkey;
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NTSTATUS status;
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status = get_ea_db_key(NULL, attr_name, fname, fd, &tkey);
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if (!NT_STATUS_IS_OK(status)) {
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return status;
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}
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if (tdb_delete(pvfs->ea_db->tdb, tkey) == -1) {
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talloc_free(tkey.dptr);
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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talloc_free(tkey.dptr);
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return NT_STATUS_OK;
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}
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/*
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delete all xattrs for a file
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*/
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NTSTATUS unlink_xattr_tdb(struct pvfs_state *pvfs, const char *fname)
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{
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TALLOC_CTX *mem_ctx = talloc_new(pvfs);
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DATA_BLOB blob;
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const char *s;
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NTSTATUS status;
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status = pull_xattr_blob_tdb(pvfs, mem_ctx, XATTR_LIST_ATTR,
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fname, -1, 100, &blob);
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if (!NT_STATUS_IS_OK(status)) {
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talloc_free(mem_ctx);
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return NT_STATUS_OK;
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}
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for (s=(const char *)blob.data; s < (const char *)(blob.data+blob.length); s += strlen(s) + 1) {
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delete_xattr_tdb(pvfs, s, fname, -1);
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}
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status = delete_xattr_tdb(pvfs, XATTR_LIST_ATTR, fname, -1);
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talloc_free(mem_ctx);
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return status;
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}
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