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/*
* Copyright (C) 2010 The Android-x86 Open Source Project
*
* Author: Chih-Wei Huang <cwhuang@linux.org.tw>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "AutoVolume"
#include <dirent.h>
#include <stdlib.h>
#include <cutils/log.h>
#include <sysutils/NetlinkEvent.h>
#include "Fat.h"
#include "Loop.h"
#include "AutoVolume.h"
AutoVolume::AutoVolume(VolumeManager *vm, const char *label, const char *mount_point, const char *sdcard)
: DirectVolume(vm, label, mount_point, -1), mSdcard(0)
{
if (sdcard && *sdcard) {
if (strncmp(sdcard, "/dev/", 5) && !access(sdcard, F_OK)) {
char loopdev[256];
if (!Loop::create(label, sdcard, loopdev, sizeof(loopdev)))
sdcard = loopdev;
} else if (!strcmp(sdcard, "ramdisk")) {
// FIXME: do not hardcode ramdisk device
const char *ramdisk = "/dev/block/ram1";
Fat::format(ramdisk, 0);
sdcard = ramdisk;
}
if (const char *d = strrchr(sdcard, '/'))
sdcard = ++d;
else if (!strcmp(sdcard, "premount"))
setState(State_Idle);
mSdcard = strdup(sdcard);
}
}
AutoVolume::~AutoVolume()
{
free(mSdcard);
}
static bool isExternalStorage(const char *dir, const char *syspath)
{
bool ret = false;
if (DIR *d = opendir(dir)) {
while (struct dirent *e = readdir(d)) {
char buf[256];
if (e->d_name[0] != '.' &&
strcmp(e->d_name, "module") && strcmp(e->d_name, "uevent") &&
strcmp(e->d_name, "unbind") && strcmp(e->d_name, "bind") &&
strcmp(e->d_name, "new_id") && strcmp(e->d_name, "remove_id")) {
char p[256];
snprintf(p, sizeof(p), "%s/%s", dir, e->d_name);
ssize_t sz = readlink(p, buf, sizeof(buf));
// skip the beginning "../../../.."
if (sz > 11 && !strncmp(buf + 11, syspath, sz - 11)) {
ret = true;
break;
}
}
}
closedir(d);
}
return ret;
}
int AutoVolume::handleBlockEvent(NetlinkEvent *evt)
{
if (evt->getAction() == NetlinkEvent::NlActionAdd) {
const char *dt = evt->findParam("DEVTYPE");
const char *dp = evt->findParam("DEVPATH");
bool isdisk = !strcmp(dt, "disk");
if (mSdcard) {
if (const char *d = strrchr(dp, '/')) {
int ret = strcmp(++d, mSdcard);
if (isdisk) {
if (ret) {
char p[256];
snprintf(p, sizeof(p), "/sys%s/%s", dp, mSdcard);
ret = access(p, F_OK);
}
if (!ret)
addPath(dp);
} else {
if (!ret) {
const char *t = evt->findParam("PARTN");
mPartIdx = t ? atoi(t) : 1;
}
}
}
} else {
if (isdisk) {
const char *storages[] = {
"/sys/bus/mmc/drivers/mmcblk", // MMC block device
"/sys/bus/usb/drivers/usb-storage", // USB Mass Storage
};
size_t i = 0;
while (i < sizeof(storages) / sizeof(const char *)) {
if (isExternalStorage(storages[i++], dp)) {
addPath(dp);
break;
}
}
}
}
}
return DirectVolume::handleBlockEvent(evt);
}
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