/*
* Copyright (C) 2008 The Android Open Source Project
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <linux/kdev_t.h>
#define LOG_TAG "DirectVolume"
#include <cutils/log.h>
#include <sysutils/NetlinkEvent.h>
#include "DirectVolume.h"
#include "VolumeManager.h"
#include "ResponseCode.h"
// #define PARTITION_DEBUG
DirectVolume::DirectVolume(VolumeManager *vm, const char *label,
const char *mount_point, int partIdx) :
Volume(vm, label, mount_point) {
mPartIdx = partIdx;
mPaths = new PathCollection();
for (int i = 0; i < MAX_PARTITIONS; i++)
mPartMinors[i] = -1;
mPendingPartMap = 0;
mDiskMajor = -1;
mDiskMinor = -1;
mDiskNumParts = 0;
setState(Volume::State_NoMedia);
}
DirectVolume::~DirectVolume() {
PathCollection::iterator it;
for (it = mPaths->begin(); it != mPaths->end(); ++it)
free(*it);
delete mPaths;
}
int DirectVolume::addPath(const char *path) {
mPaths->push_back(strdup(path));
return 0;
}
dev_t DirectVolume::getDiskDevice() {
return MKDEV(mDiskMajor, mDiskMinor);
}
dev_t DirectVolume::getShareDevice() {
if (mPartIdx != -1) {
return MKDEV(mDiskMajor, mPartIdx);
} else {
return MKDEV(mDiskMajor, mDiskMinor);
}
}
void DirectVolume::handleVolumeShared() {
setState(Volume::State_Shared);
}
void DirectVolume::handleVolumeUnshared() {
setState(Volume::State_Idle);
}
int DirectVolume::handleBlockEvent(NetlinkEvent *evt) {
const char *dp = evt->findParam("DEVPATH");
PathCollection::iterator it;
for (it = mPaths->begin(); it != mPaths->end(); ++it) {
if (!strncmp(dp, *it, strlen(*it))) {
/* We can handle this disk */
int action = evt->getAction();
const char *devtype = evt->findParam("DEVTYPE");
if (action == NetlinkEvent::NlActionAdd) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
char nodepath[255];
snprintf(nodepath,
sizeof(nodepath), "/dev/block/vold/%d:%d",
major, minor);
if (createDeviceNode(nodepath, major, minor)) {
SLOGE("Error making device node '%s' (%s)", nodepath,
strerror(errno));
}
if (!strcmp(devtype, "disk")) {
handleDiskAdded(dp, evt);
} else {
handlePartitionAdded(dp, evt);
}
} else if (action == NetlinkEvent::NlActionRemove) {
if (!strcmp(devtype, "disk")) {
handleDiskRemoved(dp, evt);
} else {
handlePartitionRemoved(dp, evt);
}
} else if (action == NetlinkEvent::NlActionChange) {
if (!strcmp(devtype, "disk")) {
handleDiskChanged(dp, evt);
} else {
handlePartitionChanged(dp, evt);
}
} else {
SLOGW("Ignoring non add/remove/change event");
}
return 0;
}
}
errno = ENODEV;
return -1;
}
void DirectVolume::handleDiskAdded(const char *devpath, NetlinkEvent *evt) {
mDiskMajor = atoi(evt->findParam("MAJOR"));
mDiskMinor = atoi(evt->findParam("MINOR"));
const char *tmp = evt->findParam("NPARTS");
if (tmp) {
mDiskNumParts = atoi(tmp);
} else {
SLOGW("Kernel block uevent missing 'NPARTS'");
mDiskNumParts = 1;
}
char msg[255];
int partmask = 0;
int i;
for (i = 1; i <= mDiskNumParts; i++) {
partmask |= (1 << i);
}
mPendingPartMap = partmask;
if (mDiskNumParts == 0) {
#ifdef PARTITION_DEBUG
SLOGD("Dv::diskIns - No partitions - good to go son!");
#endif
setState(Volume::State_Idle);
} else {
#ifdef PARTITION_DEBUG
SLOGD("Dv::diskIns - waiting for %d partitions (mask 0x%x)",
mDiskNumParts, mPendingPartMap);
#endif
setState(Volume::State_Pending);
}
snprintf(msg, sizeof(msg), "Volume %s %s disk inserted (%d:%d)",
getLabel(), getMountpoint(), mDiskMajor, mDiskMinor);
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeDiskInserted,
msg, false);
}
void DirectVolume::handlePartitionAdded(const char *devpath, NetlinkEvent *evt) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
int part_num;
const char *tmp = evt->findParam("PARTN");
if (tmp) {
part_num = atoi(tmp);
} else {
SLOGW("Kernel block uevent missing 'PARTN'");
part_num = 1;
}
if (part_num > MAX_PARTITIONS || part_num < 1) {
SLOGW("Invalid 'PARTN' value");
part_num = 1;
}
if (part_num > mDiskNumParts) {
mDiskNumParts = part_num;
}
if (major != mDiskMajor) {
SLOGE("Partition '%s' has a different major than its disk!", devpath);
return;
}
#ifdef PARTITION_DEBUG
SLOGD("Dv:partAdd: part_num = %d, minor = %d\n", part_num, minor);
#endif
mPartMinors[part_num -1] = minor;
mPendingPartMap &= ~(1 << part_num);
if (!mPendingPartMap) {
#ifdef PARTITION_DEBUG
SLOGD("Dv:partAdd: Got all partitions - ready to rock!");
#endif
if (getState() != Volume::State_Formatting) {
setState(Volume::State_Idle);
}
} else {
#ifdef PARTITION_DEBUG
SLOGD("Dv:partAdd: pending mask now = 0x%x", mPendingPartMap);
#endif
}
}
void DirectVolume::handleDiskChanged(const char *devpath, NetlinkEvent *evt) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
if ((major != mDiskMajor) || (minor != mDiskMinor)) {
return;
}
SLOGI("Volume %s disk has changed", getLabel());
const char *tmp = evt->findParam("NPARTS");
if (tmp) {
mDiskNumParts = atoi(tmp);
} else {
SLOGW("Kernel block uevent missing 'NPARTS'");
mDiskNumParts = 1;
}
int partmask = 0;
int i;
for (i = 1; i <= mDiskNumParts; i++) {
partmask |= (1 << i);
}
mPendingPartMap = partmask;
if (getState() != Volume::State_Formatting) {
if (mDiskNumParts == 0) {
setState(Volume::State_Idle);
} else {
setState(Volume::State_Pending);
}
}
}
void DirectVolume::handlePartitionChanged(const char *devpath, NetlinkEvent *evt) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
SLOGD("Volume %s %s partition %d:%d changed\n", getLabel(), getMountpoint(), major, minor);
}
void DirectVolume::handleDiskRemoved(const char *devpath, NetlinkEvent *evt) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
char msg[255];
SLOGD("Volume %s %s disk %d:%d removed\n", getLabel(), getMountpoint(), major, minor);
snprintf(msg, sizeof(msg), "Volume %s %s disk removed (%d:%d)",
getLabel(), getMountpoint(), major, minor);
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeDiskRemoved,
msg, false);
setState(Volume::State_NoMedia);
}
void DirectVolume::handlePartitionRemoved(const char *devpath, NetlinkEvent *evt) {
int major = atoi(evt->findParam("MAJOR"));
int minor = atoi(evt->findParam("MINOR"));
char msg[255];
SLOGD("Volume %s %s partition %d:%d removed\n", getLabel(), getMountpoint(), major, minor);
/*
* The framework doesn't need to get notified of
* partition removal unless it's mounted. Otherwise
* the removal notification will be sent on the Disk
* itself
*/
if (getState() != Volume::State_Mounted) {
return;
}
if ((dev_t) MKDEV(major, minor) == mCurrentlyMountedKdev) {
/*
* Yikes, our mounted partition is going away!
*/
snprintf(msg, sizeof(msg), "Volume %s %s bad removal (%d:%d)",
getLabel(), getMountpoint(), major, minor);
mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeBadRemoval,
msg, false);
if (mVm->cleanupAsec(this, true)) {
SLOGE("Failed to cleanup ASEC - unmount will probably fail!");
}
if (Volume::unmountVol(true)) {
SLOGE("Failed to unmount volume on bad removal (%s)",
strerror(errno));
// XXX: At this point we're screwed for now
} else {
SLOGD("Crisis averted");
}
}
}
/*
* Called from base to get a list of devicenodes for mounting
*/
int DirectVolume::getDeviceNodes(dev_t *devs, int max) {
if (mPartIdx == -1) {
// If the disk has no partitions, try the disk itself
if (!mDiskNumParts) {
devs[0] = MKDEV(mDiskMajor, mDiskMinor);
return 1;
}
int i;
for (i = 0; i < mDiskNumParts; i++) {
if (i == max)
break;
devs[i] = MKDEV(mDiskMajor, mPartMinors[i]);
}
return mDiskNumParts;
}
devs[0] = MKDEV(mDiskMajor, mPartMinors[mPartIdx -1]);
return 1;
}