]> git.ipfire.org Git - thirdparty/mdadm.git/blobdiff - util.c
Factor common code into new "start_mdmon".
[thirdparty/mdadm.git] / util.c
diff --git a/util.c b/util.c
index 49c36a06cafb43127e5be0214db8f87c4e6c6038..da61a0be60048a2ea7da3aeb6d1a2dc6471f5d48 100644 (file)
--- a/util.c
+++ b/util.c
@@ -761,11 +761,11 @@ int dev_open(char *dev, int flags)
                snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d:%d",
                         (int)getpid(), major, minor);
                if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
-                       fd = open(devname, flags);
+                       fd = open(devname, flags|O_DIRECT);
                        unlink(devname);
                }
        } else
-               fd = open(dev, flags);
+               fd = open(dev, flags|O_DIRECT);
        return fd;
 }
 
@@ -826,10 +826,7 @@ struct supertype *super_by_fd(int fd)
                int devnum;
                if (subarray)
                        *subarray++ = '\0';
-               if (strncmp(dev, "md_d", 4) == 0)
-                       devnum = -1-atoi(dev+4);
-               else
-                       devnum = atoi(dev+2);
+               devnum = devname2devnum(dev);
                subarray = strdup(subarray);
                if (sra)
                        sysfs_free(sra);
@@ -1013,6 +1010,17 @@ char *devnum2devname(int num)
        return strdup(name);
 }
 
+int devname2devnum(char *name)
+{
+       char *ep;
+       int num;
+       if (strncmp(name, "md_d", 4)==0)
+               num = -1-strtoul(name+4, &ep, 10);
+       else
+               num = strtoul(name+2, &ep, 10);
+       return num;
+}
+
 int fd2devnum(int fd)
 {
        struct stat stb;
@@ -1066,6 +1074,41 @@ int signal_mdmon(int devnum)
        return 0;
 }
 
+int start_mdmon(int devnum)
+{
+       int i;
+
+       if (env_no_mdmon())
+               return 0;
+
+       switch(fork()) {
+       case 0:
+               /* FIXME yuk. CLOSE_EXEC?? */
+               for (i=3; i < 100; i++)
+                       close(i);
+               execl("./mdmon", "mdmon",
+                     map_dev(dev2major(devnum),
+                             dev2minor(devnum),
+                             1), NULL);
+               exit(1);
+       case -1: fprintf(stderr, Name ": cannot run mdmon. "
+                        "Array remains readonly\n");
+               return -1;
+       default: ; /* parent - good */
+       }
+       return 0;
+}
+
+int env_no_mdmon(void)
+{
+       char *val = getenv("MDADM_NO_MDMON");
+
+       if (val && atoi(val) == 1)
+               return 1;
+
+       return 0;
+}
+
 
 int flush_metadata_updates(struct supertype *st)
 {