1 /* libs/diskconfig/write_lst.c 2 * 3 * Copyright 2008, The Android Open Source Project 4 * 5 * Licensed under the Apache License, Version 2.0 (the "License"); 6 * you may not use this file except in compliance with the License. 7 * You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 #define LOG_TAG "write_lst" 19 #include <sys/types.h> 20 #include <stdint.h> 21 #include <stdio.h> 22 #include <stdlib.h> 23 #include <unistd.h> 24 25 #include <cutils/log.h> 26 27 #include <diskconfig/diskconfig.h> 28 29 struct write_list * alloc_wl(uint32_t data_len)30 alloc_wl(uint32_t data_len) 31 { 32 struct write_list *item; 33 34 if (!(item = malloc(sizeof(struct write_list) + data_len))) { 35 ALOGE("Unable to allocate memory."); 36 return NULL; 37 } 38 39 item->len = data_len; 40 return item; 41 } 42 43 void free_wl(struct write_list * item)44 free_wl(struct write_list *item) 45 { 46 if (item) 47 free(item); 48 } 49 50 struct write_list * wlist_add(struct write_list ** lst,struct write_list * item)51 wlist_add(struct write_list **lst, struct write_list *item) 52 { 53 item->next = (*lst); 54 *lst = item; 55 return item; 56 } 57 58 void wlist_free(struct write_list * lst)59 wlist_free(struct write_list *lst) 60 { 61 struct write_list *temp_wr; 62 while (lst) { 63 temp_wr = lst->next; 64 free_wl(lst); 65 lst = temp_wr; 66 } 67 } 68 69 int wlist_commit(int fd,struct write_list * lst,int test)70 wlist_commit(int fd, struct write_list *lst, int test) 71 { 72 for(; lst; lst = lst->next) { 73 if (lseek64(fd, lst->offset, SEEK_SET) != (loff_t)lst->offset) { 74 ALOGE("Cannot seek to the specified position (%lld).", lst->offset); 75 goto fail; 76 } 77 78 if (!test) { 79 if (write(fd, lst->data, lst->len) != (int)lst->len) { 80 ALOGE("Failed writing %u bytes at position %lld.", lst->len, 81 lst->offset); 82 goto fail; 83 } 84 } else 85 ALOGI("Would write %d bytes @ offset %lld.", lst->len, lst->offset); 86 } 87 88 return 0; 89 90 fail: 91 return -1; 92 } 93