#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"
+char const Name[] = "mdmon";
+
struct active_array *discard_this;
struct active_array *pending_discard;
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;
-}
-
-
-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;
-}
-
-void remove_pidfile(char *devname);
-static void try_kill_monitor(char *devname)
+static void try_kill_monitor(pid_t pid, char *devname, int sock)
{
char buf[100];
int fd;
- pid_t pid;
- struct mdstat_ent *mdstat;
-
- sprintf(buf, "/var/run/mdadm/%s.pid", devname);
- fd = open(buf, O_RDONLY);
- if (fd < 0)
- return;
-
- if (read(fd, buf, sizeof(buf)) < 0) {
- close(fd);
- return;
- }
-
- close(fd);
- pid = strtoul(buf, NULL, 10);
+ 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") ||
+ strstr(buf, "@dmon")))
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, 0);
- }
- free_mdstat(mdstat);
- remove_pidfile(devname);
+ 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)
addr.sun_family = PF_LOCAL;
strcpy(addr.sun_path, path);
- if (bind(sfd, &addr, sizeof(addr)) < 0) {
+ umask(077); /* ensure no world write access */
+ if (bind(sfd, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
close(sfd);
return -1;
}
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 -a : All devices\n"
+" --foreground -F : Run in foreground (do not fork)\n"
+" --takeover -t : Takeover container\n"
+);
exit(2);
}
-int mdmon(char *devname, int devnum, int scan, char *switchroot);
+static int mdmon(char *devnm, 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;
+ char *devnm = NULL;
int status = 0;
+ int opt;
+ int all = 0;
+ int takeover = 0;
+ int dofork = 1;
+ static struct option options[] = {
+ {"all", 0, NULL, 'a'},
+ {"takeover", 0, NULL, 't'},
+ {"help", 0, NULL, 'h'},
+ {"offroot", 0, NULL, OffRootOpt},
+ {"foreground", 0, NULL, 'F'},
+ {NULL, 0, NULL, 0}
+ };
+
+ if (in_initrd()) {
+ /*
+ * set first char of argv[0] to @. This is used by
+ * systemd to signal that the task was launched from
+ * initrd/initramfs and should be preserved during shutdown
+ */
+ argv[0][0] = '@';
+ }
- switch (argc) {
- case 3:
- switchroot = argv[2];
- case 2:
- container_name = argv[1];
- break;
- default:
- usage();
+ while ((opt = getopt_long(argc, argv, "thaF", options, NULL)) != -1) {
+ switch (opt) {
+ case 'a':
+ container_name = argv[optind-1];
+ all = 1;
+ break;
+ case 't':
+ takeover = 1;
+ break;
+ case 'F':
+ dofork = 0;
+ break;
+ case OffRootOpt:
+ argv[0][0] = '@';
+ break;
+ case 'h':
+ default:
+ usage();
+ break;
+ }
+ }
+
+ 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));
- sprintf(container_name, "%s", devname);
+ if (strlen(e->devnm) <= (unsigned)container_len) {
+ memset(container_name, 0, container_len);
+ sprintf(container_name, "%s", e->devnm);
}
- status |= mdmon(devname, e->devnum, scan,
- switchroot);
+ status |= mdmon(e->devnm, 1, takeover);
}
}
free_mdstat(mdstat);
return status;
} else if (strncmp(container_name, "md", 2) == 0) {
- devnum = devname2devnum(container_name);
- devname = devnum2devname(devnum);
- if (strcmp(container_name, devname) != 0)
- devname = NULL;
+ int id = devnm2devid(container_name);
+ if (id)
+ devnm = container_name;
} else {
struct stat st;
- devnum = NoMdDev;
if (stat(container_name, &st) == 0)
- devnum = stat2devnum(&st);
- if (devnum == NoMdDev)
- devname = NULL;
- else
- devname = devnum2devname(devnum);
+ devnm = xstrdup(stat2devnm(&st));
}
- if (!devname) {
- fprintf(stderr, "mdmon: %s is not a valid md device name\n",
+ if (!devnm) {
+ pr_err("%s is not a valid md device name\n",
container_name);
exit(1);
}
- return mdmon(devname, devnum, scan, switchroot);
+ return mdmon(devnm, dofork && do_fork(), takeover);
}
-int mdmon(char *devname, int devnum, int scan, char *switchroot)
+static int mdmon(char *devnm, int must_fork, int takeover)
{
int mdfd;
struct mdinfo *mdi, *di;
int pfd[2];
int status;
int ignore;
+ pid_t victim = -1;
+ int victim_sock = -1;
+
+ dprintf("starting mdmon for %s\n", devnm);
- dprintf("starting mdmon for %s in %s\n",
- devname, switchroot ? : "/");
- mdfd = open_dev(devnum);
+ mdfd = open_dev(devnm);
if (mdfd < 0) {
- fprintf(stderr, "mdmon: %s: %s\n", devname,
- strerror(errno));
- return 1;
- }
- if (md_get_version(mdfd) < 0) {
- fprintf(stderr, "mdmon: %s: Not an md device\n",
- devname);
+ pr_err("%s: %s\n", devnm, strerror(errno));
return 1;
}
/* 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");
+ pr_err("failed to create pipe\n");
return 1;
}
switch(fork()) {
case -1:
- fprintf(stderr, "mdmon: failed to fork: %s\n",
- strerror(errno));
+ pr_err("failed to fork: %s\n", strerror(errno));
return 1;
case 0: /* child */
close(pfd[0]);
wait(&status);
status = WEXITSTATUS(status);
}
+ close(pfd[0]);
return status;
}
} else
pfd[0] = pfd[1] = -1;
- container = calloc(1, sizeof(*container));
- container->devnum = devnum;
- container->devname = devname;
+ container = xcalloc(1, sizeof(*container));
+ strcpy(container->devnm, devnm);
container->arrays = NULL;
- container->subarray[0] = 0;
+ container->sock = -1;
- 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|SKIP_GONE_DEVS);
+ mdi = sysfs_read(mdfd, container->devnm, GET_VERSION|GET_LEVEL|GET_DEVS);
if (!mdi) {
- fprintf(stderr, "mdmon: failed to load sysfs info for %s\n",
- container->devname);
+ pr_err("failed to load sysfs info for %s\n", container->devnm);
exit(3);
}
if (mdi->array.level != UnSet) {
- fprintf(stderr, "mdmon: %s is not a container - cannot monitor\n",
- devname);
+ pr_err("%s is not a container - cannot monitor\n", devnm);
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",
- devname);
+ pr_err("%s does not use external metadata - cannot monitor\n",
+ devnm);
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",
- devname, mdi->text_version);
+ pr_err("%s uses unsupported metadata: %s\n",
+ devnm, mdi->text_version);
exit(3);
}
container->devs = NULL;
for (di = mdi->devs; di; di = di->next) {
- struct mdinfo *cd = malloc(sizeof(*cd));
+ struct mdinfo *cd = xmalloc(sizeof(*cd));
*cd = *di;
cd->next = container->devs;
container->devs = cd;
*/
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 (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);
- }
- }
+ victim = mdmon_pid(container->devnm);
+ if (victim >= 0)
+ victim_sock = connect_monitor(container->devnm);
- /* 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);
ignore = chdir("/");
- if (make_pidfile(container->devname, O_EXCL) < 0) {
- if (ping_monitor(container->devname) == 0) {
- fprintf(stderr, "mdmon: %s already managed\n",
- container->devname);
+ if (!takeover && victim > 0 && victim_sock >= 0) {
+ if (fping_monitor(victim_sock) == 0) {
+ pr_err("%s already managed\n", container->devnm);
exit(3);
- } else {
- int err;
-
- /* cleanup the old monitor, this one is taking over */
- try_kill_monitor(container->devname);
- err = make_pidfile(container->devname, 0);
- if (err < 0) {
- fprintf(stderr, "mdmon: %s Cannot create pidfile\n",
- container->devname);
- if (err == -EROFS) {
- /* FIXME implement a mechanism to
- * prevent duplicate monitor instances
- */
- fprintf(stderr,
- "mdmon: continuing on read-only file system\n");
- } else
- exit(3);
- }
}
+ close(victim_sock);
+ victim_sock = -1;
}
- container->sock = make_control_sock(container->devname);
-
- if (container->ss->load_super(container, mdfd, devname)) {
- fprintf(stderr, "mdmon: Cannot load metadata for %s\n",
- devname);
+ if (container->ss->load_container(container, mdfd, devnm)) {
+ pr_err("Cannot load metadata for %s\n", devnm);
exit(3);
}
close(mdfd);
/* Ok, this is close enough. We can say goodbye to our parent now.
*/
+ if (victim > 0)
+ remove_pidfile(devnm);
+ if (make_pidfile(devnm) < 0) {
+ exit(3);
+ }
+ container->sock = make_control_sock(devnm);
+
status = 0;
- if (write(pfd[1], &status, sizeof(status)) < 0)
- fprintf(stderr, "mdmon: failed to notify our parent: %d\n",
- getppid());
- close(pfd[1]);
+ if (pfd[1] >= 0) {
+ if (write(pfd[1], &status, sizeof(status)) < 0)
+ pr_err("failed to notify our parent: %d\n",
+ getppid());
+ close(pfd[1]);
+ }
+
+ mlockall(MCL_CURRENT | MCL_FUTURE);
+
+ if (clone_monitor(container) < 0) {
+ pr_err("failed to start monitor process: %s\n",
+ strerror(errno));
+ exit(2);
+ }
+
+ if (victim > 0) {
+ try_kill_monitor(victim, container->devnm, victim_sock);
+ if (victim_sock >= 0)
+ close(victim_sock);
+ }
setsid();
close(0);
ignore = dup(0);
#endif
- mlockall(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++;
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;
+}
+
+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;
+}
+
+struct superswitch super0 = {
+ .name = "0.90",
+};
+struct superswitch super1 = {
+ .name = "1.x",
+};