auto mount u-disk every time

[lvjin]

hi all!
I successful auto mount u-disk ever time.

I find the device can't auto mount u-disk again if you umount it,
because the sysfs path always change.
My u-disk is sdb, and i find /sys/class/block/sdb is linked to the
sysfs path, so i change the sysfs path to /sys/class/block/sdb in
vold.fstab, and modify system/vold/DirectVolume.cpp to find the real
sysfs path(device/pci0000:00/.../block/sdb) through the link(/sys/
classblock/sdb).
I don't know whether others have the same problem.

vold.fstab:
dev_mount sdcard /mnt/sdcard auto /sys/class/block/sdb

patch:
--- DirectVolume.org.cpp 2010-10-15 15:55:22.399119041 +0800
+++ DirectVolume.cpp 2010-10-12 17:26:38.829118480 +0800
@@ -18,6 +18,7 @@
#include <stdlib.h>
#include <string.h>
#include <errno.h>
+#include <unistd.h>

#include <linux/kdev_t.h>

@@ -78,7 +79,17 @@

PathCollection::iterator it;
for (it = mPaths->begin(); it != mPaths->end(); ++it) {
- if (!strncmp(dp, *it, strlen(*it))) {
+
+ //make usb mass storage device can be auto mounted on x86 @
lvjin
+ int link_count;
+ char path_buf[1024] = {0};
+ char *mp;
+ link_count = readlink(*it, path_buf, 1024);
+ path_buf[1023] = '\0';
+ mp = &path_buf[5];
+
+// if (!strncmp(dp, *it, strlen(*it))) {
+ if (!strncmp(dp, mp, strlen(mp))) {
/* We can handle this disk */
int action = evt->getAction();
const char *devtype = evt->findParam("DEVTYPE");