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 two possible values in kernel cmdline: 25 // - androidboot.slot = a or b OR 26 // - androidboot.slot_suffix = _a or _b 27 // TODO: remove slot_suffix once it's deprecated. 28 std::string fs_mgr_get_slot_suffix() { 29 std::string slot; 30 std::string ab_suffix; 31 32 if (fs_mgr_get_boot_config("slot", &slot)) { 33 ab_suffix = "_" + slot; 34 } else if (!fs_mgr_get_boot_config("slot_suffix", &ab_suffix)) { 35 ab_suffix = ""; 36 } 37 return ab_suffix; 38 } 39 40 // Updates |fstab| for slot_suffix. Returns true on success, false on error. 41 bool fs_mgr_update_for_slotselect(struct fstab *fstab) { 42 int n; 43 std::string ab_suffix; 44 45 for (n = 0; n < fstab->num_entries; n++) { 46 if (fstab->recs[n].fs_mgr_flags & MF_SLOTSELECT) { 47 char *tmp; 48 if (ab_suffix.empty()) { 49 ab_suffix = fs_mgr_get_slot_suffix(); 50 // Returns false as non A/B devices should not have MF_SLOTSELECT. 51 if (ab_suffix.empty()) return false; 52 } 53 if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, ab_suffix.c_str()) > 0) { 54 free(fstab->recs[n].blk_device); 55 fstab->recs[n].blk_device = tmp; 56 } else { 57 return false; 58 } 59 } 60 } 61 return true; 62 } 63
