+/*
+ * mdmon - monitor external metadata arrays
+ *
+ * Copyright (C) 2007-2008 Neil Brown <neilb@suse.de>
+ * Copyright (C) 2007-2008 Intel Corporation
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+ */
/*
* md array manager.
#include <string.h>
#include <fcntl.h>
#include <signal.h>
+#include <dirent.h>
#include <sched.h>
return 0;
}
-int clone_monitor(struct supertype *container)
+#ifdef __ia64__
+int __clone2(int (*fn)(void *),
+ void *child_stack_base, size_t stack_size,
+ int flags, void *arg, ...
+ /* pid_t *pid, struct user_desc *tls, pid_t *ctid */ );
+#endif
+ int clone_monitor(struct supertype *container)
{
static char stack[4096];
+#ifdef __ia64__
+ mon_tid = __clone2(run_child, stack, sizeof(stack),
+ CLONE_FS|CLONE_FILES|CLONE_VM|CLONE_SIGHAND|CLONE_THREAD,
+ container);
+#else
mon_tid = clone(run_child, stack+4096-64,
CLONE_FS|CLONE_FILES|CLONE_VM|CLONE_SIGHAND|CLONE_THREAD,
container);
+#endif
mgr_tid = syscall(SYS_gettid);
close(fd);
pid = strtoul(buf, NULL, 10);
+ /* first rule of survival... don't off yourself */
+ if (pid == getpid())
+ return;
+
/* kill this process if it is mdmon */
sprintf(buf, "/proc/%lu/cmdline", (unsigned long) pid);
fd = open(buf, O_RDONLY);
for ( ; mdstat; mdstat = mdstat->next)
if (is_container_member(mdstat, devname)) {
sprintf(buf, "/dev/%s", mdstat->dev);
- WaitClean(buf);
+ WaitClean(buf, 0);
}
free_mdstat(mdstat);
remove_pidfile(devname);
static int do_fork(void)
{
#ifdef DEBUG
- if (env_no_mdmon())
+ if (check_env("MDADM_NO_MDMON"))
return 0;
#endif
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;
+ char *container_name = NULL;
+ char *switchroot = NULL;
+ int devnum;
+ char *devname;
+
+ 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();
+ }
- if (argc != 2) {
- fprintf(stderr, "Usage: md-manage /device/name/for/container\n");
- exit(2);
+ devnum = devname2devnum(container_name);
+ devname = devnum2devname(devnum);
+ if (strcmp(container_name, devname) != 0) {
+ fprintf(stderr, "mdmon: %s is not a valid md device name\n",
+ container_name);
+ exit(1);
}
- mdfd = open(argv[1], O_RDWR);
+ mdfd = open_dev(devnum);
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->devnum = devnum;
+ container->devname = devname;
+ 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);
}
+ close(mdfd);
/* Ok, this is close enough. We can say goodbye to our parent now.
*/
getppid());
close(pfd[1]);
- ignore = chdir("/");
setsid();
close(0);
open("/dev/null", O_RDWR);
projects / thirdparty / mdadm.git / blobdiff