#include <string.h>
#include <fcntl.h>
#include <signal.h>
+#include <dirent.h>
#include <sched.h>
return 1;
}
-
+void usage(void)
+{
+ fprintf(stderr, "Usage: mdmon [--switch-root dir] /device/name/for/container\n");
+ exit(2);
+}
int main(int argc, char *argv[])
{
int pfd[2];
int status;
int ignore;
-
- if (argc != 2) {
- fprintf(stderr, "Usage: md-manage /device/name/for/container\n");
- exit(2);
+ char *container_name = NULL;
+ char *switchroot = NULL;
+
+ switch (argc) {
+ case 2:
+ container_name = argv[1];
+ break;
+ case 4:
+ if (strcmp(argv[1], "--switch-root") != 0) {
+ fprintf(stderr, "mdmon: unknown argument %s\n", argv[1]);
+ usage();
+ }
+ switchroot = argv[2];
+ container_name = argv[3];
+ break;
+ default:
+ usage();
}
- mdfd = open(argv[1], O_RDWR);
+
+ mdfd = open(container_name, O_RDWR);
if (mdfd < 0) {
- fprintf(stderr, "md-manage: %s: %s\n", argv[1],
+ fprintf(stderr, "mdmon: %s: %s\n", container_name,
strerror(errno));
exit(1);
}
if (md_get_version(mdfd) < 0) {
- fprintf(stderr, "md-manage: %s: Not an md device\n",
- argv[1]);
+ fprintf(stderr, "mdmon: %s: Not an md device\n",
+ container_name);
exit(1);
}
}
} else
pfd[0] = pfd[1] = -1;
- /* hopefully it is a container - we'll check later */
container = malloc(sizeof(*container));
container->devnum = fd2devnum(mdfd);
container->devname = devnum2devname(container->devnum);
- container->device_name = argv[1];
+ container->device_name = container_name;
+ container->arrays = NULL;
+
+ if (!container->devname) {
+ fprintf(stderr, "mdmon: failed to allocate container name string\n");
+ exit(3);
+ }
+
+ mdi = sysfs_read(mdfd, container->devnum,
+ GET_VERSION|GET_LEVEL|GET_DEVS);
+
+ if (!mdi) {
+ fprintf(stderr, "mdmon: failed to load sysfs info for %s\n",
+ container->devname);
+ exit(3);
+ }
+ if (mdi->array.level != UnSet) {
+ fprintf(stderr, "mdmon: %s is not a container - cannot monitor\n",
+ container_name);
+ exit(3);
+ }
+ if (mdi->array.major_version != -1 ||
+ mdi->array.minor_version != -2) {
+ fprintf(stderr, "mdmon: %s does not use external metadata - cannot monitor\n",
+ container_name);
+ exit(3);
+ }
+
+ container->ss = find_metadata_methods(mdi->text_version);
+ if (container->ss == NULL) {
+ fprintf(stderr, "mdmon: %s uses unknown metadata: %s\n",
+ container_name, mdi->text_version);
+ exit(3);
+ }
+
+ container->devs = NULL;
+ for (di = mdi->devs; di; di = di->next) {
+ struct mdinfo *cd = malloc(sizeof(*cd));
+ *cd = *di;
+ cd->next = container->devs;
+ container->devs = cd;
+ }
+ sysfs_free(mdi);
/* SIGUSR is sent between parent and child. So both block it
* and enable it only with pselect.
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, NULL);
- /* If this fails, we hope it already exists */
+ if (switchroot) {
+ /* we assume we assume that /sys /proc /dev are available in
+ * the new root (see nash:setuproot)
+ *
+ * kill any monitors in the current namespace and change
+ * to the new one
+ */
+ try_kill_monitor(container->devname);
+ if (chroot(switchroot) != 0) {
+ fprintf(stderr, "mdmon: failed to chroot to '%s': %s\n",
+ switchroot, strerror(errno));
+ exit(4);
+ }
+ }
+
+ /* If this fails, we hope it already exists
+ * pid file lives in /var/run/mdadm/mdXX.pid
+ */
+ mkdir("/var", 0600);
+ mkdir("/var/run", 0600);
mkdir("/var/run/mdadm", 0600);
- /* pid file lives in /var/run/mdadm/mdXX.pid */
+ ignore = chdir("/");
if (make_pidfile(container->devname, O_EXCL) < 0) {
if (ping_monitor(container->devname) == 0) {
fprintf(stderr, "mdmon: %s already managed\n",
}
}
}
-
container->sock = make_control_sock(container->devname);
- container->arrays = NULL;
-
- mdi = sysfs_read(mdfd, container->devnum,
- GET_VERSION|GET_LEVEL|GET_DEVS);
- if (!mdi) {
- fprintf(stderr, "mdmon: failed to load sysfs info for %s\n",
- container->devname);
- exit(3);
- }
- if (mdi->array.level != UnSet) {
- fprintf(stderr, "mdmon: %s is not a container - cannot monitor\n",
- argv[1]);
- exit(3);
- }
- if (mdi->array.major_version != -1 ||
- mdi->array.minor_version != -2) {
- fprintf(stderr, "mdmon: %s does not use external metadata - cannot monitor\n",
- argv[1]);
- exit(3);
- }
-
- container->ss = find_metadata_methods(mdi->text_version);
- if (container->ss == NULL) {
- fprintf(stderr, "mdmon: %s uses unknown metadata: %s\n",
- argv[1], mdi->text_version);
- exit(3);
- }
-
- container->devs = NULL;
- for (di = mdi->devs; di; di = di->next) {
- struct mdinfo *cd = malloc(sizeof(*cd));
- *cd = *di;
- cd->next = container->devs;
- container->devs = cd;
- }
- sysfs_free(mdi);
-
-
- if (container->ss->load_super(container, mdfd, argv[1])) {
+ if (container->ss->load_super(container, mdfd, container_name)) {
fprintf(stderr, "mdmon: Cannot load metadata for %s\n",
- argv[1]);
+ container_name);
exit(3);
}
getppid());
close(pfd[1]);
- ignore = chdir("/");
setsid();
close(0);
open("/dev/null", O_RDWR);