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
20 #include <stdint.h>
21 #include <stdio.h>
22 #include <stdlib.h>
23 #include <sys/types.h>
24 #include <unistd.h>
25
26 #include <diskconfig/diskconfig.h>
27 #include <log/log.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).", (long long)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 (long long)lst->offset);
82 goto fail;
83 }
84 } else
85 ALOGI("Would write %d bytes @ offset %lld.", lst->len, (long long)lst->offset);
86 }
87
88 return 0;
89
90 fail:
91 return -1;
92 }
93