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. 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. 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
