+
+/* Make sure we can open as many devices as needed */
+void enable_fds(int devices)
+{
+ unsigned int fds = 20 + devices;
+ struct rlimit lim;
+ if (getrlimit(RLIMIT_NOFILE, &lim) != 0
+ || lim.rlim_cur >= fds)
+ return;
+ if (lim.rlim_max < fds)
+ lim.rlim_max = fds;
+ lim.rlim_cur = fds;
+ setrlimit(RLIMIT_NOFILE, &lim);
+}
+
+int in_initrd(void)
+{
+ /* This is based on similar function in systemd. */
+ struct statfs s;
+ /* statfs.f_type is signed long on s390x and MIPS, causing all
+ sorts of sign extension problems with RAMFS_MAGIC being
+ defined as 0x858458f6 */
+ return statfs("/", &s) >= 0 &&
+ ((unsigned long)s.f_type == TMPFS_MAGIC ||
+ ((unsigned long)s.f_type & 0xFFFFFFFFUL) ==
+ ((unsigned long)RAMFS_MAGIC & 0xFFFFFFFFUL));
+}
+
+void reopen_mddev(int mdfd)
+{
+ /* Re-open without any O_EXCL, but keep
+ * the same fd
+ */
+ char *devnm;
+ int fd;
+ devnm = fd2devnm(mdfd);
+ close(mdfd);
+ fd = open_dev(devnm);
+ if (fd >= 0 && fd != mdfd)
+ dup2(fd, mdfd);
+}