2 * Copyright (c) 2013 Grzegorz Kostka (kostka.grzegorz@gmail.com)
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
9 * - Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * - The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 #include <ext4_config.h>
30 #include <ext4_blockdev.h>
31 #include <ext4_errno.h>
40 /**@brief Default filename.*/
41 static const char *fname = "ext2";
43 /**@brief IO block size.*/
44 #define EXT4_IORAW_BSIZE 512
46 /**@brief Image file descriptor.*/
47 static HANDLE dev_file;
49 /**********************BLOCKDEV INTERFACE**************************************/
50 static int io_raw_open(struct ext4_blockdev *bdev);
51 static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
53 static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
54 uint64_t blk_id, uint32_t blk_cnt);
55 static int io_raw_close(struct ext4_blockdev *bdev);
57 /******************************************************************************/
58 EXT4_BLOCKDEV_STATIC_INSTANCE(_filedev, EXT4_IORAW_BSIZE, 0, io_raw_open,
59 io_raw_bread, io_raw_bwrite, io_raw_close, 0, 0);
61 /******************************************************************************/
62 static int io_raw_open(struct ext4_blockdev *bdev)
70 sprintf(path, "\\\\.\\%s", fname);
73 CreateFile(path, GENERIC_READ | GENERIC_WRITE,
74 FILE_SHARE_WRITE | FILE_SHARE_READ, NULL, OPEN_EXISTING,
75 FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH, NULL);
77 if (dev_file == INVALID_HANDLE_VALUE) {
82 DeviceIoControl(dev_file, IOCTL_DISK_GET_DRIVE_GEOMETRY, NULL, 0,
83 &pdg, sizeof(pdg), &junk, (LPOVERLAPPED)NULL);
85 if (bResult == FALSE) {
86 CloseHandle(dev_file);
90 disk_size = pdg.Cylinders.QuadPart * (ULONG)pdg.TracksPerCylinder *
91 (ULONG)pdg.SectorsPerTrack * (ULONG)pdg.BytesPerSector;
93 _filedev.bdif->ph_bsize = pdg.BytesPerSector;
94 _filedev.bdif->ph_bcnt = disk_size / pdg.BytesPerSector;
96 _filedev.part_offset = 0;
97 _filedev.part_size = disk_size;
102 /******************************************************************************/
104 static int io_raw_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
107 long hipart = blk_id >> (32 - 9);
108 long lopart = blk_id << 9;
112 lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
114 if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
120 if (!ReadFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
121 err = GetLastError();
127 /******************************************************************************/
128 static int io_raw_bwrite(struct ext4_blockdev *bdev, const void *buf,
129 uint64_t blk_id, uint32_t blk_cnt)
131 long hipart = blk_id >> (32 - 9);
132 long lopart = blk_id << 9;
136 lopart = SetFilePointer(dev_file, lopart, &hipart, FILE_BEGIN);
138 if (lopart == -1 && NO_ERROR != (err = GetLastError())) {
144 if (!WriteFile(dev_file, buf, blk_cnt * 512, &n, NULL)) {
145 err = GetLastError();
151 /******************************************************************************/
152 static int io_raw_close(struct ext4_blockdev *bdev)
154 CloseHandle(dev_file);
158 /******************************************************************************/
159 struct ext4_blockdev *ext4_io_raw_dev_get(void) { return &_filedev; }
160 /******************************************************************************/
161 void ext4_io_raw_filename(const char *n) { fname = n; }
163 /******************************************************************************/