libf2fs_io.c revision 8bcdc5fdb206196241dc6fc535e6d285d4985201 
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_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
40int 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
49int 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
58int 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
67int dev_write_block(void *buf, __u64 blk_addr)
68{
69	return dev_write(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
70}
71
72int 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
81int 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
93int dev_read_block(void *buf, __u64 blk_addr)
94{
95	return dev_read(buf, blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
96}
97
98int 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
103int dev_reada_block(__u64 blk_addr)
104{
105	return dev_readahead(blk_addr * F2FS_BLKSIZE, F2FS_BLKSIZE);
106}
107
108void 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