1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
// SPDX-License-Identifier: GPL-2.0
#include "kublk.h"
void backing_file_tgt_deinit(struct ublk_dev *dev)
{
int i;
for (i = 1; i < dev->nr_fds; i++) {
fsync(dev->fds[i]);
close(dev->fds[i]);
}
}
int backing_file_tgt_init(struct ublk_dev *dev)
{
int fd, i;
assert(dev->nr_fds == 1);
for (i = 0; i < dev->tgt.nr_backing_files; i++) {
char *file = dev->tgt.backing_file[i];
unsigned long bytes;
struct stat st;
ublk_dbg(UBLK_DBG_DEV, "%s: file %d: %s\n", __func__, i, file);
fd = open(file, O_RDWR | O_DIRECT);
if (fd < 0) {
ublk_err("%s: backing file %s can't be opened: %s\n",
__func__, file, strerror(errno));
return -EBADF;
}
if (fstat(fd, &st) < 0) {
close(fd);
return -EBADF;
}
if (S_ISREG(st.st_mode))
bytes = st.st_size;
else if (S_ISBLK(st.st_mode)) {
if (ioctl(fd, BLKGETSIZE64, &bytes) != 0)
return -1;
} else {
return -EINVAL;
}
dev->tgt.backing_file_size[i] = bytes;
dev->fds[dev->nr_fds] = fd;
dev->nr_fds += 1;
}
return 0;
}
|
