1 /**
2 * libf2fs.c
3 *
4 * Copyright (c) 2013 Samsung Electronics Co., Ltd.
5 * http://www.samsung.com/
6 *
7 * Dual licensed under the GPL or LGPL version 2 licenses.
8 */
9 #define _LARGEFILE64_SOURCE
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <errno.h>
15 #include <unistd.h>
16 #include <fcntl.h>
17 #include <mntent.h>
18 #include <time.h>
19 #include <sys/stat.h>
20 #include <sys/mount.h>
21 #include <sys/ioctl.h>
22 #include <linux/hdreg.h>
23
24 #include <f2fs_fs.h>
25
26 struct f2fs_configuration config;
27
28 /*
29 * IO interfaces
30 */
dev_read_version(void * buf,__u64 offset,size_t len)31 int dev_read_version(void *buf, __u64 offset, size_t len)
32 {
33 if (lseek64(config.kd, (off64_t)offset, SEEK_SET) < 0)
34 return -1;
35 if (read(config.kd, buf, len) < 0)
36 return -1;
37 return 0;
38 }
39
dev_read(void * buf,__u64 offset,size_t len)40 int dev_read(void *buf, __u64 offset, size_t len)
41 {
42 if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
43 return -1;
44 if (read(config.fd, buf, len) < 0)
45 return -1;
46 return 0;
47 }
48
dev_readahead(__u64 offset,size_t len)49 int dev_readahead(__u64 offset, size_t len)
50 {
51 #ifdef POSIX_FADV_WILLNEED
52 return posix_fadvise(config.fd, offset, len, POSIX_FADV_WILLNEED);
53 #else
54 return 0;
55 #endif
56 }
57
dev_write(void * buf,__u64 offset,size_t len)58 int dev_write(void *buf, __u64 offset, size_t len)
59 {
60 if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
61 return -1;
62 if (write(config.fd, buf, len) < 0)
63 return -1;
64 return 0;
65 }
66
dev_write_block(void * buf,__u64 blk_addr)67 int dev_write_block(void *buf, __u64 blk_addr)
68 {
69 return dev_write(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
70 }
71
dev_write_dump(void * buf,__u64 offset,size_t len)72 int dev_write_dump(void *buf, __u64 offset, size_t len)
73 {
74 if (lseek64(config.dump_fd, (off64_t)offset, SEEK_SET) < 0)
75 return -1;
76 if (write(config.dump_fd, buf, len) < 0)
77 return -1;
78 return 0;
79 }
80
dev_fill(void * buf,__u64 offset,size_t len)81 int dev_fill(void *buf, __u64 offset, size_t len)
82 {
83 /* Only allow fill to zero */
84 if (*((__u8*)buf))
85 return -1;
86 if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
87 return -1;
88 if (write(config.fd, buf, len) < 0)
89 return -1;
90 return 0;
91 }
92
dev_read_block(void * buf,__u64 blk_addr)93 int dev_read_block(void *buf, __u64 blk_addr)
94 {
95 return dev_read(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
96 }
97
dev_read_blocks(void * buf,__u64 addr,__u32 nr_blks)98 int dev_read_blocks(void *buf, __u64 addr, __u32 nr_blks)
99 {
100 return dev_read(buf, addr * F2FS_BLKSIZE, nr_blks * F2FS_BLKSIZE);
101 }
102
dev_reada_block(__u64 blk_addr)103 int dev_reada_block(__u64 blk_addr)
104 {
105 return dev_readahead(blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
106 }
107
f2fs_finalize_device(struct f2fs_configuration * c)108 void f2fs_finalize_device(struct f2fs_configuration *c)
109 {
110 /*
111 * We should call fsync() to flush out all the dirty pages
112 * in the block device page cache.
113 */
114 if (fsync(c->fd) < 0)
115 MSG(0, "\tError: Could not conduct fsync!!!\n");
116
117 if (close(c->fd) < 0)
118 MSG(0, "\tError: Failed to close device file!!!\n");
119
120 close(c->kd);
121 }
122