if (source_dir == 0) {
file = av[optind++];
+ ret = is_swap_device(file);
+ if (ret < 0) {
+ fprintf(stderr, "error checking %s status: %s\n", file,
+ strerror(-ret));
+ exit(1);
+ }
+ if (ret == 1) {
+ fprintf(stderr, "%s is a swap device\n", file);
+ exit(1);
+ }
ret = check_mounted(file);
if (ret < 0) {
fprintf(stderr, "error checking %s mount status\n", file);
exit(1);
}
ac--;
+ /* check if the device is busy */
+ fd = open(file, O_RDWR|O_EXCL);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s: %s\n", file,
+ strerror(errno));
+ exit(1);
+ }
+ close(fd);
+ /*
+ * open again without O_EXCL so that the problem should not
+ * occur by the following processing.
+ * (btrfs_register_one_device() fails if O_EXCL is on)
+ */
fd = open(file, O_RDWR);
if (fd < 0) {
- fprintf(stderr, "unable to open %s\n", file);
+ fprintf(stderr, "unable to open %s: %s\n", file,
+ strerror(errno));
exit(1);
}
first_file = file;
int old_mixed = mixed;
file = av[optind++];
+ ret = is_swap_device(file);
+ if (ret < 0) {
+ fprintf(stderr, "error checking %s status: %s\n", file,
+ strerror(-ret));
+ exit(1);
+ }
+ if (ret == 1) {
+ fprintf(stderr, "%s is a swap device\n", file);
+ exit(1);
+ }
ret = check_mounted(file);
if (ret < 0) {
fprintf(stderr, "error checking %s mount status\n",
fprintf(stderr, "%s is mounted\n", file);
exit(1);
}
+ /* check if the device is busy */
+ fd = open(file, O_RDWR|O_EXCL);
+ if (fd < 0) {
+ fprintf(stderr, "unable to open %s: %s\n", file,
+ strerror(errno));
+ exit(1);
+ }
+ close(fd);
+ /*
+ * open again without O_EXCL so that the problem should not
+ * occur by the following processing.
+ * (btrfs_register_one_device() fails if O_EXCL is on)
+ */
fd = open(file, O_RDWR);
if (fd < 0) {
- fprintf(stderr, "unable to open %s\n", file);
+ fprintf(stderr, "unable to open %s: %s\n", file,
+ strerror(errno));
exit(1);
}
ret = btrfs_device_already_in_root(root, fd,
return 0;
}
+
+#define isoctal(c) (((c) & ~7) == '0')
+
+static inline void translate(char *f, char *t)
+{
+ while (*f != '\0') {
+ if (*f == '\\' &&
+ isoctal(f[1]) && isoctal(f[2]) && isoctal(f[3])) {
+ *t++ = 64*(f[1] & 7) + 8*(f[2] & 7) + (f[3] & 7);
+ f += 4;
+ } else
+ *t++ = *f++;
+ }
+ *t = '\0';
+ return;
+}
+
+/*
+ * Checks if the swap device.
+ * Returns 1 if swap device, < 0 on error or 0 if not swap device.
+ */
+int is_swap_device(const char *file)
+{
+ FILE *f;
+ struct stat st_buf;
+ dev_t dev;
+ ino_t ino = 0;
+ char tmp[PATH_MAX];
+ char buf[PATH_MAX];
+ char *cp;
+ int ret = 0;
+
+ if (stat(file, &st_buf) < 0)
+ return -errno;
+ if (S_ISBLK(st_buf.st_mode))
+ dev = st_buf.st_rdev;
+ else if (S_ISREG(st_buf.st_mode)) {
+ dev = st_buf.st_dev;
+ ino = st_buf.st_ino;
+ } else
+ return 0;
+
+ if ((f = fopen("/proc/swaps", "r")) == NULL)
+ return 0;
+
+ /* skip the first line */
+ if (fgets(tmp, sizeof(tmp), f) == NULL)
+ goto out;
+
+ while (fgets(tmp, sizeof(tmp), f) != NULL) {
+ if ((cp = strchr(tmp, ' ')) != NULL)
+ *cp = '\0';
+ if ((cp = strchr(tmp, '\t')) != NULL)
+ *cp = '\0';
+ translate(tmp, buf);
+ if (stat(buf, &st_buf) != 0)
+ continue;
+ if (S_ISBLK(st_buf.st_mode)) {
+ if (dev == st_buf.st_rdev) {
+ ret = 1;
+ break;
+ }
+ } else if (S_ISREG(st_buf.st_mode)) {
+ if (dev == st_buf.st_dev && ino == st_buf.st_ino) {
+ ret = 1;
+ break;
+ }
+ }
+ }
+
+out:
+ fclose(f);
+
+ return ret;
+}