1 /*
2 * Copyright (C) 2015 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18
19 #include <string>
20
21 #include "fs_mgr.h"
22 #include "fs_mgr_priv.h"
23
24 // Returns "_a" or "_b" based on androidboot.slot_suffix in kernel cmdline, or an empty string
25 // if that parameter does not exist.
fs_mgr_get_slot_suffix()26 std::string fs_mgr_get_slot_suffix() {
27 std::string ab_suffix;
28
29 fs_mgr_get_boot_config("slot_suffix", &ab_suffix);
30 return ab_suffix;
31 }
32
33 // Updates |fstab| for slot_suffix. Returns true on success, false on error.
fs_mgr_update_for_slotselect(struct fstab * fstab)34 bool fs_mgr_update_for_slotselect(struct fstab *fstab) {
35 int n;
36 std::string ab_suffix;
37
38 for (n = 0; n < fstab->num_entries; n++) {
39 if (fstab->recs[n].fs_mgr_flags & MF_SLOTSELECT) {
40 char *tmp;
41 if (ab_suffix.empty()) {
42 ab_suffix = fs_mgr_get_slot_suffix();
43 // Return false if failed to get ab_suffix when MF_SLOTSELECT is specified.
44 if (ab_suffix.empty()) return false;
45 }
46 if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, ab_suffix.c_str()) > 0) {
47 free(fstab->recs[n].blk_device);
48 fstab->recs[n].blk_device = tmp;
49 } else {
50 return false;
51 }
52 }
53 }
54 return true;
55 }
56