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 #define _LARGEFILE64_SOURCE
30 #define _FILE_OFFSET_BITS 64
32 #include <ext4_config.h>
33 #include <ext4_blockdev.h>
34 #include <ext4_errno.h>
35 #include <ext4_debug.h>
39 #include <sys/types.h>
47 #include <sys/socket.h>
50 /**@brief Default filename.*/
51 static const char *fname = "ext2";
53 /**@brief Image block size.*/
54 #define EXT4_FILEDEV_BSIZE 512
56 /**@brief Image file descriptor.*/
59 #define DROP_LINUXCACHE_BUFFERS 0
61 /**********************BLOCKDEV INTERFACE**************************************/
62 static int file_dev_open(struct ext4_blockdev *bdev);
63 static int file_dev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
65 static int file_dev_bwrite(struct ext4_blockdev *bdev, const void *buf,
66 uint64_t blk_id, uint32_t blk_cnt);
67 static int file_dev_close(struct ext4_blockdev *bdev);
69 /******************************************************************************/
70 EXT4_BLOCKDEV_STATIC_INSTANCE(file_dev, EXT4_FILEDEV_BSIZE, 0, file_dev_open,
71 file_dev_bread, file_dev_bwrite, file_dev_close, 0, 0);
73 /******************************************************************************/
74 static int file_dev_open(struct ext4_blockdev *bdev)
76 dev_file = open(fname, O_RDWR);
79 printf("open of %s failed %d\n", fname, errno);
80 ext4_blockdev_errno = errno;
85 /* The lseek approach to finding the device's size does not seem
86 * to work on macOS so do it this way instead.
89 if (ioctl(dev_file, DKIOCGETBLOCKCOUNT, §ors) < 0) {
90 printf("ioctl DKIOCGETBLOCKCOUNT failed %d\n", errno);
94 uint32_t sector_size = 0;
95 if (ioctl(dev_file, DKIOCGETBLOCKSIZE, §or_size) < 0) {
96 printf("ioctl DKIOCGETBLOCKSIZE failed %d\n", errno);
101 off_t size = sectors * sector_size;
103 off_t size = lseek(dev_file, 0, SEEK_END);
104 if (size == ((off_t) -1)) {
110 file_dev.part_offset = 0;
111 file_dev.part_size = size;
112 file_dev.bdif->ph_bcnt = file_dev.part_size / file_dev.bdif->ph_bsize;
117 /******************************************************************************/
119 static int file_dev_bread(struct ext4_blockdev *bdev, void *buf, uint64_t blk_id,
122 if (lseek(dev_file, blk_id * bdev->bdif->ph_bsize, SEEK_SET) < 0) {
123 ext4_blockdev_errno = errno;
124 printf("lseek failed %d\n", errno);
129 if (read(dev_file, buf, bdev->bdif->ph_bsize * blk_cnt) < 0) {
130 ext4_blockdev_errno = errno;
131 printf("read failed %d\n", errno);
138 static void drop_cache(void)
140 #if defined(__linux__) && DROP_LINUXCACHE_BUFFERS
145 fd = open("/proc/sys/vm/drop_caches", O_WRONLY);
146 write(fd, data, sizeof(char));
151 /******************************************************************************/
152 static int file_dev_bwrite(struct ext4_blockdev *bdev, const void *buf,
153 uint64_t blk_id, uint32_t blk_cnt)
155 if (lseek(dev_file, blk_id * bdev->bdif->ph_bsize, SEEK_SET) < 0) {
156 ext4_blockdev_errno = errno;
157 printf("fseeko failed %d\n", errno);
162 if (write(dev_file, buf, bdev->bdif->ph_bsize * blk_cnt) < 0) {
163 ext4_blockdev_errno = errno;
164 printf("write failed %d\n", errno);
171 /******************************************************************************/
172 static int file_dev_close(struct ext4_blockdev *bdev)
178 /******************************************************************************/
179 struct ext4_blockdev *file_dev_get(void)
183 /******************************************************************************/
184 void file_dev_name_set(const char *n)
188 /******************************************************************************/