San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame] | 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 * |
| 30 | alloc_wl(uint32_t data_len) |
| 31 | { |
| 32 | struct write_list *item; |
| 33 | |
| 34 | if (!(item = malloc(sizeof(struct write_list) + data_len))) { |
Steve Block | 01dda20 | 2012-01-06 14:13:42 +0000 | [diff] [blame] | 35 | ALOGE("Unable to allocate memory."); |
San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame] | 36 | return NULL; |
| 37 | } |
| 38 | |
| 39 | item->len = data_len; |
| 40 | return item; |
| 41 | } |
| 42 | |
| 43 | void |
| 44 | free_wl(struct write_list *item) |
| 45 | { |
| 46 | if (item) |
| 47 | free(item); |
| 48 | } |
| 49 | |
| 50 | struct write_list * |
| 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 |
| 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 |
| 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) { |
Ying Wang | 9d4c76f | 2014-04-23 18:28:14 -0700 | [diff] [blame^] | 74 | ALOGE("Cannot seek to the specified position (%lld).", (long long)lst->offset); |
San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame] | 75 | goto fail; |
| 76 | } |
| 77 | |
| 78 | if (!test) { |
| 79 | if (write(fd, lst->data, lst->len) != (int)lst->len) { |
Steve Block | 01dda20 | 2012-01-06 14:13:42 +0000 | [diff] [blame] | 80 | ALOGE("Failed writing %u bytes at position %lld.", lst->len, |
Ying Wang | 9d4c76f | 2014-04-23 18:28:14 -0700 | [diff] [blame^] | 81 | (long long)lst->offset); |
San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame] | 82 | goto fail; |
| 83 | } |
| 84 | } else |
Ying Wang | 9d4c76f | 2014-04-23 18:28:14 -0700 | [diff] [blame^] | 85 | ALOGI("Would write %d bytes @ offset %lld.", lst->len, (long long)lst->offset); |
San Mehat | a6391f1 | 2010-03-10 12:46:00 -0800 | [diff] [blame] | 86 | } |
| 87 | |
| 88 | return 0; |
| 89 | |
| 90 | fail: |
| 91 | return -1; |
| 92 | } |