libf2fs_io.c revision dc530859c5e422b10ab70bc3b9d4b7ff0d004d57 
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
26struct f2fs_configuration config;
27
28/*
29 * IO interfaces
30 */
31int dev_read(void *buf, __u64 offset, size_t len)
32{
33	if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
34		return -1;
35	if (read(config.fd, buf, len) < 0)
36		return -1;
37	return 0;
38}
39
40int dev_write(void *buf, __u64 offset, size_t len)
41{
42	if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
43		return -1;
44	if (write(config.fd, buf, len) < 0)
45		return -1;
46	return 0;
47}
48
49int dev_write_block(void *buf, __u64 blk_addr)
50{
51	return dev_write(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
52}
53
54int dev_write_dump(void *buf, __u64 offset, size_t len)
55{
56	if (lseek64(config.dump_fd, (off64_t)offset, SEEK_SET) < 0)
57		return -1;
58	if (write(config.dump_fd, buf, len) < 0)
59		return -1;
60	return 0;
61}
62
63int dev_fill(void *buf, __u64 offset, size_t len)
64{
65	/* Only allow fill to zero */
66	if (*((__u8*)buf))
67		return -1;
68	if (lseek64(config.fd, (off64_t)offset, SEEK_SET) < 0)
69		return -1;
70	if (write(config.fd, buf, len) < 0)
71		return -1;
72	return 0;
73}
74
75int dev_read_block(void *buf, __u64 blk_addr)
76{
77	return dev_read(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
78}
79
80int dev_read_blocks(void *buf, __u64 addr, __u32 nr_blks)
81{
82	return dev_read(buf, addr * F2FS_BLKSIZE, nr_blks * F2FS_BLKSIZE);
83}
84
85void f2fs_finalize_device(struct f2fs_configuration *c)
86{
87	/*
88	 * We should call fsync() to flush out all the dirty pages
89	 * in the block device page cache.
90	 */
91	if (fsync(c->fd) < 0)
92		MSG(0, "\tError: Could not conduct fsync!!!\n");
93
94	if (close(c->fd) < 0)
95		MSG(0, "\tError: Failed to close device file!!!\n");
96}
97