vold2: Add block device udev bootstrapping

Signed-off-by: San Mehat <san@android.com>

main.cpp

@@ -18,6 +18,11 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <dirent.h>
 
 #define LOG_TAG "Vold"
 
@@ -29,6 +34,7 @@
 #include "DeviceVolume.h"
 
 static int process_config(VolumeManager *vm);
+static void coldboot(const char *path);
 
 int main() {
 
@@ -68,6 +74,8 @@ int main() {
         exit(1);
     }
 
+    coldboot("/sys/block");
+
     /*
      * Now that we're up, we can respond to commands
      */
@@ -85,6 +93,51 @@ int main() {
     exit(0);
 }
 
+static void do_coldboot(DIR *d, int lvl)
+{
+    struct dirent *de;
+    int dfd, fd;
+
+    dfd = dirfd(d);
+
+    fd = openat(dfd, "uevent", O_WRONLY);
+    if(fd >= 0) {
+        write(fd, "add\n", 4);
+        close(fd);
+    }
+
+    while((de = readdir(d))) {
+        DIR *d2;
+
+        if (de->d_name[0] == '.')
+            continue;
+
+        if (de->d_type != DT_DIR && lvl > 0)
+            continue;
+
+        fd = openat(dfd, de->d_name, O_RDONLY | O_DIRECTORY);
+        if(fd < 0)
+            continue;
+
+        d2 = fdopendir(fd);
+        if(d2 == 0)
+            close(fd);
+        else {
+            do_coldboot(d2, lvl + 1);
+            closedir(d2);
+        }
+    }
+}
+
+static void coldboot(const char *path)
+{
+    DIR *d = opendir(path);
+    if(d) {
+        do_coldboot(d, 0);
+        closedir(d);
+    }
+}
+
 static int process_config(VolumeManager *vm) {
     FILE *fp;
     int n = 0;