#include <fcntl.h>
#include <signal.h>
#include <dirent.h>
-
+#ifdef USE_PTHREADS
+#include <pthread.h>
+#else
#include <sched.h>
+#endif
#include "mdadm.h"
#include "mdmon.h"
int sigterm;
-int run_child(void *v)
+#ifdef USE_PTHREADS
+static void *run_child(void *v)
+{
+ struct supertype *c = v;
+
+ mon_tid = syscall(SYS_gettid);
+ do_monitor(c);
+ return 0;
+}
+
+static int clone_monitor(struct supertype *container)
+{
+ pthread_attr_t attr;
+ pthread_t thread;
+ int rc;
+
+ mon_tid = -1;
+ pthread_attr_init(&attr);
+ pthread_attr_setstacksize(&attr, 4096);
+ pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+ rc = pthread_create(&thread, &attr, run_child, container);
+ if (rc)
+ return rc;
+ while (mon_tid == -1)
+ usleep(10);
+ pthread_attr_destroy(&attr);
+
+ mgr_tid = syscall(SYS_gettid);
+
+ return mon_tid;
+}
+#else /* USE_PTHREADS */
+static int run_child(void *v)
{
struct supertype *c = v;
int flags, void *arg, ...
/* pid_t *pid, struct user_desc *tls, pid_t *ctid */ );
#endif
- int clone_monitor(struct supertype *container)
+static int clone_monitor(struct supertype *container)
{
static char stack[4096];
return mon_tid;
}
+#endif /* USE_PTHREADS */
-static struct superswitch *find_metadata_methods(char *vers)
-{
- if (strcmp(vers, "ddf") == 0)
- return &super_ddf;
- if (strcmp(vers, "imsm") == 0)
- return &super_imsm;
- return NULL;
-}
-
-static int test_pidfile(char *devname)
-{
- char path[100];
- struct stat st;
-
- sprintf(path, "/var/run/mdadm/%s.pid", devname);
- return stat(path, &st);
-}
-
-int make_pidfile(char *devname, int o_excl)
+static int make_pidfile(char *devname)
{
char path[100];
char pid[10];
int fd;
int n;
- if (sigterm)
- return -1;
-
- sprintf(path, "/var/run/mdadm/%s.pid", devname);
+ if (mkdir(MDMON_DIR, 0755) < 0 &&
+ errno != EEXIST)
+ return -errno;
+ sprintf(path, "%s/%s.pid", MDMON_DIR, devname);
- fd = open(path, O_RDWR|O_CREAT|o_excl, 0600);
+ fd = open(path, O_RDWR|O_CREAT|O_EXCL, 0600);
if (fd < 0)
return -errno;
sprintf(pid, "%d\n", getpid());
return 0;
}
-int is_container_member(struct mdstat_ent *mdstat, char *container)
-{
- if (mdstat->metadata_version == NULL ||
- strncmp(mdstat->metadata_version, "external:", 9) != 0 ||
- !is_subarray(mdstat->metadata_version+9) ||
- strncmp(mdstat->metadata_version+10, container, strlen(container)) != 0 ||
- mdstat->metadata_version[10+strlen(container)] != '/')
- return 0;
-
- return 1;
-}
-
-pid_t devname2mdmon(char *devname)
-{
- char buf[100];
- pid_t pid = -1;
- int fd;
-
- sprintf(buf, "/var/run/mdadm/%s.pid", devname);
- fd = open(buf, O_RDONLY|O_NOATIME);
- if (fd < 0)
- return -1;
-
- if (read(fd, buf, sizeof(buf)) > 0)
- sscanf(buf, "%d\n", &pid);
- close(fd);
-
- return pid;
-}
-
static void try_kill_monitor(pid_t pid, char *devname, int sock)
{
char buf[100];
int fd;
- struct mdstat_ent *mdstat;
+ int n;
+ long fl;
/* first rule of survival... don't off yourself */
if (pid == getpid())
if (fd < 0)
return;
- if (read(fd, buf, sizeof(buf)) < 0) {
- close(fd);
- return;
- }
+ n = read(fd, buf, sizeof(buf)-1);
+ buf[sizeof(buf)-1] = 0;
+ close(fd);
- if (!strstr(buf, "mdmon"))
+ if (n < 0 || !strstr(buf, "mdmon"))
return;
kill(pid, SIGTERM);
- mdstat = mdstat_read(0, 0);
- for ( ; mdstat; mdstat = mdstat->next)
- if (is_container_member(mdstat, devname)) {
- sprintf(buf, "/dev/%s", mdstat->dev);
- WaitClean(buf, sock, 0);
- }
- free_mdstat(mdstat);
+ if (sock < 0)
+ return;
+
+ /* Wait for monitor to exit by reading from the socket, after
+ * clearing the non-blocking flag */
+ fl = fcntl(sock, F_GETFL, 0);
+ fl &= ~O_NONBLOCK;
+ fcntl(sock, F_SETFL, fl);
+ n = read(sock, buf, 100);
+ /* Ignore result, it is just the wait that
+ * matters
+ */
}
void remove_pidfile(char *devname)
{
char buf[100];
- if (sigterm)
- return;
-
- sprintf(buf, "/var/run/mdadm/%s.pid", devname);
+ sprintf(buf, "%s/%s.pid", MDMON_DIR, devname);
unlink(buf);
- sprintf(buf, "/var/run/mdadm/%s.sock", devname);
+ sprintf(buf, "%s/%s.sock", MDMON_DIR, devname);
unlink(buf);
}
-int make_control_sock(char *devname)
+static int make_control_sock(char *devname)
{
char path[100];
int sfd;
if (sigterm)
return -1;
- sprintf(path, "/var/run/mdadm/%s.sock", devname);
+ sprintf(path, "%s/%s.sock", MDMON_DIR, devname);
unlink(path);
sfd = socket(PF_LOCAL, SOCK_STREAM, 0);
if (sfd < 0)
return sfd;
}
-int socket_hup_requested;
-static void hup(int sig)
-{
- socket_hup_requested = 1;
-}
-
static void term(int sig)
{
sigterm = 1;
void usage(void)
{
- fprintf(stderr, "Usage: mdmon /device/name/for/container [target_dir]\n");
+ fprintf(stderr,
+"Usage: mdmon [options] CONTAINER\n"
+"\n"
+"Options are:\n"
+" --help -h : This message\n"
+" --all : All devices\n"
+" --takeover -t : Takeover container\n"
+" --offroot : Set first character of argv[0] to @ to indicate the\n"
+" application was launched from initrd/initramfs and\n"
+" should not be shutdown by systemd as part of the\n"
+" regular shutdown process.\n"
+);
exit(2);
}
-int mdmon(char *devname, int devnum, int scan, char *switchroot);
+static int mdmon(char *devname, int devnum, int must_fork, int takeover);
int main(int argc, char *argv[])
{
char *container_name = NULL;
- char *switchroot = NULL;
int devnum;
char *devname;
- int scan = 0;
int status = 0;
+ int opt;
+ int all = 0;
+ int takeover = 0;
+ static struct option options[] = {
+ {"all", 0, NULL, 'a'},
+ {"takeover", 0, NULL, 't'},
+ {"help", 0, NULL, 'h'},
+ {"offroot", 0, NULL, OffRootOpt},
+ {NULL, 0, NULL, 0}
+ };
+
+ while ((opt = getopt_long(argc, argv, "th", options, NULL)) != -1) {
+ switch (opt) {
+ case 'a':
+ container_name = argv[optind-1];
+ all = 1;
+ break;
+ case 't':
+ container_name = optarg;
+ takeover = 1;
+ break;
+ case OffRootOpt:
+ argv[0][0] = '@';
+ break;
+ case 'h':
+ default:
+ usage();
+ break;
+ }
+ }
- switch (argc) {
- case 3:
- switchroot = argv[2];
- case 2:
- container_name = argv[1];
- break;
- default:
- usage();
+ if (all == 0 && container_name == NULL) {
+ if (argv[optind])
+ container_name = argv[optind];
}
- if (strcmp(container_name, "/proc/mdstat") == 0) {
+ if (container_name == NULL)
+ usage();
+
+ if (argc - optind > 1)
+ usage();
+
+ if (strcmp(container_name, "/proc/mdstat") == 0)
+ all = 1;
+
+ if (all) {
struct mdstat_ent *mdstat, *e;
+ int container_len = strlen(container_name);
/* launch an mdmon instance for each container found */
- scan = 1;
mdstat = mdstat_read(0, 0);
for (e = mdstat; e; e = e->next) {
- if (strncmp(e->metadata_version, "external:", 9) == 0 &&
+ if (e->metadata_version &&
+ strncmp(e->metadata_version, "external:", 9) == 0 &&
!is_subarray(&e->metadata_version[9])) {
devname = devnum2devname(e->devnum);
/* update cmdline so this mdmon instance can be
* distinguished from others in a call to ps(1)
*/
- if (strlen(devname) <= strlen(container_name)) {
- memset(container_name, 0, strlen(container_name));
+ if (strlen(devname) <= (unsigned)container_len) {
+ memset(container_name, 0, container_len);
sprintf(container_name, "%s", devname);
}
- status |= mdmon(devname, e->devnum, scan,
- switchroot);
+ status |= mdmon(devname, e->devnum, 1,
+ takeover);
}
}
free_mdstat(mdstat);
container_name);
exit(1);
}
- return mdmon(devname, devnum, scan, switchroot);
+ return mdmon(devname, devnum, do_fork(), takeover);
}
-int mdmon(char *devname, int devnum, int scan, char *switchroot)
+static int mdmon(char *devname, int devnum, int must_fork, int takeover)
{
int mdfd;
struct mdinfo *mdi, *di;
pid_t victim = -1;
int victim_sock = -1;
- dprintf("starting mdmon for %s in %s\n",
- devname, switchroot ? : "/");
-
- /* try to spawn mdmon instances from the target file system */
- if (switchroot && strcmp(switchroot, "/") != 0) {
- char path[1024];
- pid_t pid;
-
- sprintf(path, "%s/sbin/mdmon", switchroot);
- switch (fork()) {
- case 0:
- execl(path, "mdmon", devname, NULL);
- exit(1);
- case -1:
- return 1;
- default:
- pid = wait(&status);
- if (pid > -1 && WIFEXITED(status) &&
- WEXITSTATUS(status) == 0)
- return 0;
- else
- return 1;
- }
- }
+ dprintf("starting mdmon for %s\n", devname);
mdfd = open_dev(devnum);
if (mdfd < 0) {
}
/* Fork, and have the child tell us when they are ready */
- if (do_fork() || scan) {
+ if (must_fork) {
if (pipe(pfd) != 0) {
fprintf(stderr, "mdmon: failed to create pipe\n");
return 1;
container->devnum = devnum;
container->devname = devname;
container->arrays = NULL;
- container->subarray[0] = 0;
container->sock = -1;
if (!container->devname) {
exit(3);
}
- mdi = sysfs_read(mdfd, container->devnum,
- GET_VERSION|GET_LEVEL|GET_DEVS|SKIP_GONE_DEVS);
+ 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",
exit(3);
}
- container->ss = find_metadata_methods(mdi->text_version);
+ container->ss = version_to_superswitch(mdi->text_version);
if (container->ss == NULL) {
- fprintf(stderr, "mdmon: %s uses unknown metadata: %s\n",
+ fprintf(stderr, "mdmon: %s uses unsupported metadata: %s\n",
devname, mdi->text_version);
exit(3);
}
*/
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
- sigaddset(&set, SIGHUP);
- sigaddset(&set, SIGALRM);
sigaddset(&set, SIGTERM);
sigprocmask(SIG_BLOCK, &set, NULL);
act.sa_handler = wake_me;
act.sa_flags = 0;
sigaction(SIGUSR1, &act, NULL);
- sigaction(SIGALRM, &act, NULL);
- act.sa_handler = hup;
- sigaction(SIGHUP, &act, NULL);
act.sa_handler = term;
sigaction(SIGTERM, &act, NULL);
act.sa_handler = SIG_IGN;
sigaction(SIGPIPE, &act, NULL);
- if (switchroot) {
- /* we assume we assume that /sys /proc /dev are available in
- * the new root
- */
- victim = devname2mdmon(container->devname);
+ victim = mdmon_pid(container->devnum);
+ if (victim >= 0)
victim_sock = connect_monitor(container->devname);
- if (chroot(switchroot) != 0) {
- fprintf(stderr, "mdmon: failed to chroot to '%s': %s\n",
- switchroot, strerror(errno));
- exit(4);
- }
- }
ignore = chdir("/");
- if (victim < 0 && test_pidfile(container->devname) == 0) {
- if (ping_monitor(container->devname) == 0) {
+ if (!takeover && victim > 0 && victim_sock >= 0) {
+ if (fping_monitor(victim_sock) == 0) {
fprintf(stderr, "mdmon: %s already managed\n",
container->devname);
exit(3);
- } else if (victim < 0)
- victim = devname2mdmon(container->devname);
+ }
+ close(victim_sock);
+ victim_sock = -1;
}
- if (container->ss->load_super(container, mdfd, devname)) {
+ if (container->ss->load_container(container, mdfd, devname)) {
fprintf(stderr, "mdmon: Cannot load metadata for %s\n",
devname);
exit(3);
/* Ok, this is close enough. We can say goodbye to our parent now.
*/
+ if (victim > 0)
+ remove_pidfile(devname);
+ if (make_pidfile(devname) < 0) {
+ exit(3);
+ }
+ container->sock = make_control_sock(devname);
+
status = 0;
if (write(pfd[1], &status, sizeof(status)) < 0)
fprintf(stderr, "mdmon: failed to notify our parent: %d\n",
getppid());
close(pfd[1]);
+ mlockall(MCL_CURRENT | MCL_FUTURE);
+
+ if (clone_monitor(container) < 0) {
+ fprintf(stderr, "mdmon: failed to start monitor process: %s\n",
+ strerror(errno));
+ exit(2);
+ }
+
+ if (victim > 0) {
+ try_kill_monitor(victim, container->devname, victim_sock);
+ if (victim_sock >= 0)
+ close(victim_sock);
+ }
+
setsid();
close(0);
open("/dev/null", O_RDWR);
ignore = dup(0);
#endif
- mlockall(MCL_CURRENT | MCL_FUTURE);
-
- if (clone_monitor(container) < 0) {
- fprintf(stderr, "mdmon: failed to start monitor process: %s\n",
- strerror(errno));
- exit(2);
- }
+ /* This silliness is to stop the compiler complaining
+ * that we ignore 'ignore'
+ */
+ if (ignore)
+ ignore++;
- if (victim > -1) {
- try_kill_monitor(victim, container->devname, victim_sock);
- close(victim_sock);
- }
do_manager(container);
exit(0);
}
+
+/* Some stub functions so super-* can link with us */
+int child_monitor(int afd, struct mdinfo *sra, struct reshape *reshape,
+ struct supertype *st, unsigned long blocks,
+ int *fds, unsigned long long *offsets,
+ int dests, int *destfd, unsigned long long *destoffsets)
+{
+ return 0;
+}
+
+int restore_stripes(int *dest, unsigned long long *offsets,
+ int raid_disks, int chunk_size, int level, int layout,
+ int source, unsigned long long read_offset,
+ unsigned long long start, unsigned long long length,
+ char *src_buf)
+{
+ return 1;
+}
+
+void abort_reshape(struct mdinfo *sra)
+{
+ return;
+}
+
+int save_stripes(int *source, unsigned long long *offsets,
+ int raid_disks, int chunk_size, int level, int layout,
+ int nwrites, int *dest,
+ unsigned long long start, unsigned long long length,
+ char *buf)
+{
+ return 0;
+}