1*10d962daSMing Lei // SPDX-License-Identifier: GPL-2.0
2*10d962daSMing Lei
3*10d962daSMing Lei #include "kublk.h"
4*10d962daSMing Lei
backing_file_tgt_deinit(struct ublk_dev * dev)5*10d962daSMing Lei void backing_file_tgt_deinit(struct ublk_dev *dev)
6*10d962daSMing Lei {
7*10d962daSMing Lei int i;
8*10d962daSMing Lei
9*10d962daSMing Lei for (i = 1; i < dev->nr_fds; i++) {
10*10d962daSMing Lei fsync(dev->fds[i]);
11*10d962daSMing Lei close(dev->fds[i]);
12*10d962daSMing Lei }
13*10d962daSMing Lei }
14*10d962daSMing Lei
backing_file_tgt_init(struct ublk_dev * dev)15*10d962daSMing Lei int backing_file_tgt_init(struct ublk_dev *dev)
16*10d962daSMing Lei {
17*10d962daSMing Lei int fd, i;
18*10d962daSMing Lei
19*10d962daSMing Lei assert(dev->nr_fds == 1);
20*10d962daSMing Lei
21*10d962daSMing Lei for (i = 0; i < dev->tgt.nr_backing_files; i++) {
22*10d962daSMing Lei char *file = dev->tgt.backing_file[i];
23*10d962daSMing Lei unsigned long bytes;
24*10d962daSMing Lei struct stat st;
25*10d962daSMing Lei
26*10d962daSMing Lei ublk_dbg(UBLK_DBG_DEV, "%s: file %d: %s\n", __func__, i, file);
27*10d962daSMing Lei
28*10d962daSMing Lei fd = open(file, O_RDWR | O_DIRECT);
29*10d962daSMing Lei if (fd < 0) {
30*10d962daSMing Lei ublk_err("%s: backing file %s can't be opened: %s\n",
31*10d962daSMing Lei __func__, file, strerror(errno));
32*10d962daSMing Lei return -EBADF;
33*10d962daSMing Lei }
34*10d962daSMing Lei
35*10d962daSMing Lei if (fstat(fd, &st) < 0) {
36*10d962daSMing Lei close(fd);
37*10d962daSMing Lei return -EBADF;
38*10d962daSMing Lei }
39*10d962daSMing Lei
40*10d962daSMing Lei if (S_ISREG(st.st_mode))
41*10d962daSMing Lei bytes = st.st_size;
42*10d962daSMing Lei else if (S_ISBLK(st.st_mode)) {
43*10d962daSMing Lei if (ioctl(fd, BLKGETSIZE64, &bytes) != 0)
44*10d962daSMing Lei return -1;
45*10d962daSMing Lei } else {
46*10d962daSMing Lei return -EINVAL;
47*10d962daSMing Lei }
48*10d962daSMing Lei
49*10d962daSMing Lei dev->tgt.backing_file_size[i] = bytes;
50*10d962daSMing Lei dev->fds[dev->nr_fds] = fd;
51*10d962daSMing Lei dev->nr_fds += 1;
52*10d962daSMing Lei }
53*10d962daSMing Lei
54*10d962daSMing Lei return 0;
55*10d962daSMing Lei }
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