+
+int zero_disk_range(int fd, unsigned long long sector, size_t count)
+{
+ int ret = 0;
+ int fd_zero;
+ void *addr = NULL;
+ size_t written = 0;
+ size_t len = count * 512;
+ ssize_t n;
+
+ fd_zero = open("/dev/zero", O_RDONLY);
+ if (fd_zero < 0) {
+ pr_err("Cannot open /dev/zero\n");
+ return -1;
+ }
+
+ if (lseek64(fd, sector * 512, SEEK_SET) < 0) {
+ ret = -errno;
+ pr_err("Failed to seek offset for zeroing\n");
+ goto out;
+ }
+
+ addr = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd_zero, 0);
+
+ if (addr == MAP_FAILED) {
+ ret = -errno;
+ pr_err("Mapping /dev/zero failed\n");
+ goto out;
+ }
+
+ do {
+ n = write(fd, addr + written, len - written);
+ if (n < 0) {
+ if (errno == EINTR)
+ continue;
+ ret = -errno;
+ pr_err("Zeroing disk range failed\n");
+ break;
+ }
+ written += n;
+ } while (written != len);
+
+ munmap(addr, len);
+
+out:
+ close(fd_zero);
+ return ret;
+}