DirectVolume.cpp revision dd9b8e92aaf330b48ddb40a7380588ef92b53de6 
1/*
2 * Copyright (C) 2008 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <stdio.h>
18#include <stdlib.h>
19#include <string.h>
20#include <errno.h>
21
22#define LOG_TAG "Vold"
23
24#include <cutils/log.h>
25#include <sysutils/NetlinkEvent.h>
26
27#include "DirectVolume.h"
28
29DirectVolume::DirectVolume(const char *label, const char *mount_point, int partIdx) :
30              Volume(label, mount_point) {
31    mPartIdx = partIdx;
32
33    mPaths = new PathCollection();
34    for (int i = 0; i < MAX_PARTITIONS; i++)
35        mPartMinors[i] = -1;
36}
37
38DirectVolume::~DirectVolume() {
39    PathCollection::iterator it;
40
41    for (it = mPaths->begin(); it != mPaths->end(); ++it)
42        free(*it);
43    delete mPaths;
44}
45
46int DirectVolume::addPath(const char *path) {
47    mPaths->push_back(strdup(path));
48    return 0;
49}
50
51int DirectVolume::handleBlockEvent(NetlinkEvent *evt) {
52    const char *dp = evt->findParam("DEVPATH");
53
54    PathCollection::iterator  it;
55    for (it = mPaths->begin(); it != mPaths->end(); ++it) {
56        if (!strncmp(dp, *it, strlen(*it))) {
57            /* We can handle this disk */
58            int action = evt->getAction();
59            const char *devtype = evt->findParam("DEVTYPE");
60
61            if (!strcmp(devtype, "disk")) {
62                if (action == NetlinkEvent::NlActionAdd)
63                    handleDiskAdded(dp, evt);
64                else if (action == NetlinkEvent::NlActionRemove)
65                    handleDiskRemoved(dp, evt);
66                else
67                    LOGD("Ignoring non add/remove event");
68            } else {
69                if (action == NetlinkEvent::NlActionAdd)
70                    handlePartitionAdded(dp, evt);
71                else if (action == NetlinkEvent::NlActionRemove)
72                    handlePartitionRemoved(dp, evt);
73                else
74                    LOGD("Ignoring non add/remove event");
75            }
76
77            return 0;
78        }
79    }
80    errno = ENODEV;
81    return -1;
82}
83
84void DirectVolume::handleDiskAdded(const char *devpath, NetlinkEvent *evt) {
85    mDiskMajor = atoi(evt->findParam("MAJOR"));
86    mDiskMinor = atoi(evt->findParam("MAJOR"));
87    mDiskNumParts = atoi(evt->findParam("NPARTS"));
88
89    int partmask = 0;
90    int i;
91    for (i = 1; i <= mDiskNumParts; i++) {
92        partmask |= (1 << i);
93    }
94    mPendingPartMap = partmask;
95
96    if (mDiskNumParts == 0) {
97        LOGD("Dv::diskIns - No partitions - good to go son!");
98        setState(Volume::State_Idle);
99    } else {
100        LOGD("Dv::diskIns - waiting for %d partitions (mask 0x%x)",
101             mDiskNumParts, mPendingPartMap);
102        setState(Volume::State_Pending);
103    }
104}
105
106void DirectVolume::handlePartitionAdded(const char *devpath, NetlinkEvent *evt) {
107    int major = atoi(evt->findParam("MAJOR"));
108    int minor = atoi(evt->findParam("MINOR"));
109    int part_num = atoi(evt->findParam("PARTN"));
110
111    if (major != mDiskMajor) {
112        LOGE("Partition '%s' has a different major than its disk!", devpath);
113        return;
114    }
115    mPartMinors[part_num -1] = minor;
116
117    mPendingPartMap &= ~(1 << part_num);
118    if (!mPendingPartMap) {
119        LOGD("Dv:partAdd: Got all partitions - ready to rock!");
120        setState(Volume::State_Idle);
121    } else {
122        LOGD("Dv:partAdd: pending mask now = 0x%x", mPendingPartMap);
123    }
124}
125
126void DirectVolume::handleDiskRemoved(const char *devpath, NetlinkEvent *evt) {
127}
128
129void DirectVolume::handlePartitionRemoved(const char *devpath, NetlinkEvent *evt) {
130}
131
132/*
133 * Called from Volume to determine the major/minor numbers
134 * to be used for mounting
135 */
136int DirectVolume::prepareToMount(int *major, int *minor) {
137    *major = mDiskMajor;
138
139    if (mPartIdx == -1) {
140        /* No specific partition specified */
141
142        if (!mDiskNumParts) {
143            *minor = mDiskMinor;
144            return 0;
145        }
146
147        /*
148         * XXX: Use first partition for now.
149         * The right thing to do would be to choose
150         * this based on the partition type.
151         *
152         */
153
154        *minor = mPartMinors[0];
155        return 0;
156    }
157
158    if (mPartIdx - 1 > mDiskNumParts) {
159        errno = EINVAL;
160        return -1;
161    }
162
163    *minor = mPartMinors[mPartIdx-1];
164    return 0;
165}
166