Allow scanning of devices listed in /proc/partitions independant of /dev

[thirdparty/mdadm.git] / util.c

diff --git a/util.c b/util.c
index e702b8d24020486ae992dad5bf2e425354e41862..9204d531f86a569def9fc20fee72550d1b1f93d2 100644 (file)
--- a/util.c
+++ b/util.c
@@ -589,7 +589,28 @@ void put_md_name(char *name)
                unlink(name);
 }
 
-
+int dev_open(char *dev, int flags)
+{
+       /* like 'open', but if 'dev' matches %d:%d, create a temp
+        * block device and open that
+        */
+       char *e;
+       int fd = -1;
+       char devname[32];
+       int major = strtoul(dev, &e, 0);
+       int minor;
+       if (e > dev && *e == ':' && e[1] &&
+           (minor = strtoul(e+1, &e, 0)) >= 0 &&
+           *e == 0) {
+               snprintf(devname, sizeof(devname), "/dev/.tmp.md.%d:%d", major, minor);
+               if (mknod(devname, S_IFBLK|0600, makedev(major, minor))==0) {
+                       fd = open(devname, flags);
+                       unlink(devname);
+               }
+       } else
+               fd = open(dev, flags);
+       return fd;
+}
 
 struct superswitch *superlist[] = { &super0, &super1, NULL };