| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #include <stdio.h> |
| |
| #include <string> |
| |
| #include "fs_mgr.h" |
| #include "fs_mgr_priv.h" |
| |
| // Returns "_a" or "_b" based on two possible values in kernel cmdline: |
| // - androidboot.slot = a or b OR |
| // - androidboot.slot_suffix = _a or _b |
| // TODO: remove slot_suffix once it's deprecated. |
| std::string fs_mgr_get_slot_suffix() { |
| std::string slot; |
| std::string ab_suffix; |
| |
| if (fs_mgr_get_boot_config("slot", &slot)) { |
| ab_suffix = "_" + slot; |
| } else if (!fs_mgr_get_boot_config("slot_suffix", &ab_suffix)) { |
| ab_suffix = ""; |
| } |
| return ab_suffix; |
| } |
| |
| // Updates |fstab| for slot_suffix. Returns true on success, false on error. |
| bool fs_mgr_update_for_slotselect(struct fstab *fstab) { |
| int n; |
| std::string ab_suffix; |
| |
| for (n = 0; n < fstab->num_entries; n++) { |
| if (fstab->recs[n].fs_mgr_flags & MF_SLOTSELECT) { |
| char *tmp; |
| if (ab_suffix.empty()) { |
| ab_suffix = fs_mgr_get_slot_suffix(); |
| // Return false if failed to get ab_suffix when MF_SLOTSELECT is specified. |
| if (ab_suffix.empty()) return false; |
| } |
| if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, ab_suffix.c_str()) > 0) { |
| free(fstab->recs[n].blk_device); |
| fstab->recs[n].blk_device = tmp; |
| } else { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |