DirectVolume.cpp revision 3374b41f1fea95dab455f565e6fc6db456bddc8b 
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#include <linux/kdev_t.h>
23
24#define LOG_TAG "DirectVolume"
25
26#include <cutils/log.h>
27#include <sysutils/NetlinkEvent.h>
28
29#include "DirectVolume.h"
30#include "VolumeManager.h"
31#include "ResponseCode.h"
32
33// #define PARTITION_DEBUG
34
35DirectVolume::DirectVolume(VolumeManager *vm, const char *label,
36                           const char *mount_point, int partIdx) :
37              Volume(vm, label, mount_point) {
38    mPartIdx = partIdx;
39
40    mPaths = new PathCollection();
41    for (int i = 0; i < MAX_PARTITIONS; i++)
42        mPartMinors[i] = -1;
43    mPendingPartMap = 0;
44    mDiskMajor = -1;
45    mDiskMinor = -1;
46    mDiskNumParts = 0;
47
48    setState(Volume::State_NoMedia);
49}
50
51DirectVolume::~DirectVolume() {
52    PathCollection::iterator it;
53
54    for (it = mPaths->begin(); it != mPaths->end(); ++it)
55        free(*it);
56    delete mPaths;
57}
58
59int DirectVolume::addPath(const char *path) {
60    mPaths->push_back(strdup(path));
61    return 0;
62}
63
64dev_t DirectVolume::getDiskDevice() {
65    return MKDEV(mDiskMajor, mDiskMinor);
66}
67
68dev_t DirectVolume::getShareDevice() {
69    if (mPartIdx != -1) {
70        return MKDEV(mDiskMajor, mPartIdx);
71    } else {
72        return MKDEV(mDiskMajor, mDiskMinor);
73    }
74}
75
76void DirectVolume::handleVolumeShared() {
77    setState(Volume::State_Shared);
78}
79
80void DirectVolume::handleVolumeUnshared() {
81    setState(Volume::State_Idle);
82}
83
84int DirectVolume::handleBlockEvent(NetlinkEvent *evt) {
85    const char *dp = evt->findParam("DEVPATH");
86
87    PathCollection::iterator  it;
88    for (it = mPaths->begin(); it != mPaths->end(); ++it) {
89        if (!strncmp(dp, *it, strlen(*it))) {
90            /* We can handle this disk */
91            int action = evt->getAction();
92            const char *devtype = evt->findParam("DEVTYPE");
93
94            if (action == NetlinkEvent::NlActionAdd) {
95                int major = atoi(evt->findParam("MAJOR"));
96                int minor = atoi(evt->findParam("MINOR"));
97                char nodepath[255];
98
99                snprintf(nodepath,
100                         sizeof(nodepath), "/dev/block/vold/%d:%d",
101                         major, minor);
102                if (createDeviceNode(nodepath, major, minor)) {
103                    SLOGE("Error making device node '%s' (%s)", nodepath,
104                                                               strerror(errno));
105                }
106                if (!strcmp(devtype, "disk")) {
107                    handleDiskAdded(dp, evt);
108                } else {
109                    handlePartitionAdded(dp, evt);
110                }
111            } else if (action == NetlinkEvent::NlActionRemove) {
112                if (!strcmp(devtype, "disk")) {
113                    handleDiskRemoved(dp, evt);
114                } else {
115                    handlePartitionRemoved(dp, evt);
116                }
117            } else if (action == NetlinkEvent::NlActionChange) {
118                if (!strcmp(devtype, "disk")) {
119                    handleDiskChanged(dp, evt);
120                } else {
121                    handlePartitionChanged(dp, evt);
122                }
123            } else {
124                    SLOGW("Ignoring non add/remove/change event");
125            }
126
127            return 0;
128        }
129    }
130    errno = ENODEV;
131    return -1;
132}
133
134void DirectVolume::handleDiskAdded(const char *devpath, NetlinkEvent *evt) {
135    mDiskMajor = atoi(evt->findParam("MAJOR"));
136    mDiskMinor = atoi(evt->findParam("MINOR"));
137
138    const char *tmp = evt->findParam("NPARTS");
139    if (tmp) {
140        mDiskNumParts = atoi(tmp);
141    } else {
142        SLOGW("Kernel block uevent missing 'NPARTS'");
143        mDiskNumParts = 1;
144    }
145
146    char msg[255];
147
148    int partmask = 0;
149    int i;
150    for (i = 1; i <= mDiskNumParts; i++) {
151        partmask |= (1 << i);
152    }
153    mPendingPartMap = partmask;
154
155    if (mDiskNumParts == 0) {
156#ifdef PARTITION_DEBUG
157        SLOGD("Dv::diskIns - No partitions - good to go son!");
158#endif
159        setState(Volume::State_Idle);
160    } else {
161#ifdef PARTITION_DEBUG
162        SLOGD("Dv::diskIns - waiting for %d partitions (mask 0x%x)",
163             mDiskNumParts, mPendingPartMap);
164#endif
165        setState(Volume::State_Pending);
166    }
167
168    snprintf(msg, sizeof(msg), "Volume %s %s disk inserted (%d:%d)",
169             getLabel(), getMountpoint(), mDiskMajor, mDiskMinor);
170    mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeDiskInserted,
171                                             msg, false);
172}
173
174void DirectVolume::handlePartitionAdded(const char *devpath, NetlinkEvent *evt) {
175    int major = atoi(evt->findParam("MAJOR"));
176    int minor = atoi(evt->findParam("MINOR"));
177
178    int part_num;
179
180    const char *tmp = evt->findParam("PARTN");
181
182    if (tmp) {
183        part_num = atoi(tmp);
184    } else {
185        SLOGW("Kernel block uevent missing 'PARTN'");
186        part_num = 1;
187    }
188
189    if (part_num > mDiskNumParts) {
190        mDiskNumParts = part_num;
191    }
192
193    if (major != mDiskMajor) {
194        SLOGE("Partition '%s' has a different major than its disk!", devpath);
195        return;
196    }
197#ifdef PARTITION_DEBUG
198    SLOGD("Dv:partAdd: part_num = %d, minor = %d\n", part_num, minor);
199#endif
200    if (part_num >= MAX_PARTITIONS) {
201        SLOGE("Dv:partAdd: ignoring part_num = %d (max: %d)\n", part_num, MAX_PARTITIONS-1);
202    } else {
203        mPartMinors[part_num -1] = minor;
204    }
205    mPendingPartMap &= ~(1 << part_num);
206
207    if (!mPendingPartMap) {
208#ifdef PARTITION_DEBUG
209        SLOGD("Dv:partAdd: Got all partitions - ready to rock!");
210#endif
211        if (getState() != Volume::State_Formatting) {
212            setState(Volume::State_Idle);
213        }
214    } else {
215#ifdef PARTITION_DEBUG
216        SLOGD("Dv:partAdd: pending mask now = 0x%x", mPendingPartMap);
217#endif
218    }
219}
220
221void DirectVolume::handleDiskChanged(const char *devpath, NetlinkEvent *evt) {
222    int major = atoi(evt->findParam("MAJOR"));
223    int minor = atoi(evt->findParam("MINOR"));
224
225    if ((major != mDiskMajor) || (minor != mDiskMinor)) {
226        return;
227    }
228
229    SLOGI("Volume %s disk has changed", getLabel());
230    const char *tmp = evt->findParam("NPARTS");
231    if (tmp) {
232        mDiskNumParts = atoi(tmp);
233    } else {
234        SLOGW("Kernel block uevent missing 'NPARTS'");
235        mDiskNumParts = 1;
236    }
237
238    int partmask = 0;
239    int i;
240    for (i = 1; i <= mDiskNumParts; i++) {
241        partmask |= (1 << i);
242    }
243    mPendingPartMap = partmask;
244
245    if (getState() != Volume::State_Formatting) {
246        if (mDiskNumParts == 0) {
247            setState(Volume::State_Idle);
248        } else {
249            setState(Volume::State_Pending);
250        }
251    }
252}
253
254void DirectVolume::handlePartitionChanged(const char *devpath, NetlinkEvent *evt) {
255    int major = atoi(evt->findParam("MAJOR"));
256    int minor = atoi(evt->findParam("MINOR"));
257    SLOGD("Volume %s %s partition %d:%d changed\n", getLabel(), getMountpoint(), major, minor);
258}
259
260void DirectVolume::handleDiskRemoved(const char *devpath, NetlinkEvent *evt) {
261    int major = atoi(evt->findParam("MAJOR"));
262    int minor = atoi(evt->findParam("MINOR"));
263    char msg[255];
264
265    SLOGD("Volume %s %s disk %d:%d removed\n", getLabel(), getMountpoint(), major, minor);
266    snprintf(msg, sizeof(msg), "Volume %s %s disk removed (%d:%d)",
267             getLabel(), getMountpoint(), major, minor);
268    mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeDiskRemoved,
269                                             msg, false);
270    setState(Volume::State_NoMedia);
271}
272
273void DirectVolume::handlePartitionRemoved(const char *devpath, NetlinkEvent *evt) {
274    int major = atoi(evt->findParam("MAJOR"));
275    int minor = atoi(evt->findParam("MINOR"));
276    char msg[255];
277    int state;
278
279    SLOGD("Volume %s %s partition %d:%d removed\n", getLabel(), getMountpoint(), major, minor);
280
281    /*
282     * The framework doesn't need to get notified of
283     * partition removal unless it's mounted. Otherwise
284     * the removal notification will be sent on the Disk
285     * itself
286     */
287    state = getState();
288    if (state != Volume::State_Mounted && state != Volume::State_Shared) {
289        return;
290    }
291
292    if ((dev_t) MKDEV(major, minor) == mCurrentlyMountedKdev) {
293        /*
294         * Yikes, our mounted partition is going away!
295         */
296
297        snprintf(msg, sizeof(msg), "Volume %s %s bad removal (%d:%d)",
298                 getLabel(), getMountpoint(), major, minor);
299        mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeBadRemoval,
300                                             msg, false);
301
302	if (mVm->cleanupAsec(this, true)) {
303            SLOGE("Failed to cleanup ASEC - unmount will probably fail!");
304        }
305
306        if (Volume::unmountVol(true)) {
307            SLOGE("Failed to unmount volume on bad removal (%s)",
308                 strerror(errno));
309            // XXX: At this point we're screwed for now
310        } else {
311            SLOGD("Crisis averted");
312        }
313    } else if (state == Volume::State_Shared) {
314        /* removed during mass storage */
315        snprintf(msg, sizeof(msg), "Volume %s bad removal (%d:%d)",
316                 getLabel(), major, minor);
317        mVm->getBroadcaster()->sendBroadcast(ResponseCode::VolumeBadRemoval,
318                                             msg, false);
319
320        if (mVm->unshareVolume(getLabel(), "ums")) {
321            SLOGE("Failed to unshare volume on bad removal (%s)",
322                strerror(errno));
323        } else {
324            SLOGD("Crisis averted");
325        }
326    }
327}
328
329/*
330 * Called from base to get a list of devicenodes for mounting
331 */
332int DirectVolume::getDeviceNodes(dev_t *devs, int max) {
333
334    if (mPartIdx == -1) {
335        // If the disk has no partitions, try the disk itself
336        if (!mDiskNumParts) {
337            devs[0] = MKDEV(mDiskMajor, mDiskMinor);
338            return 1;
339        }
340
341        int i;
342        for (i = 0; i < mDiskNumParts; i++) {
343            if (i == max)
344                break;
345            devs[i] = MKDEV(mDiskMajor, mPartMinors[i]);
346        }
347        return mDiskNumParts;
348    }
349    devs[0] = MKDEV(mDiskMajor, mPartMinors[mPartIdx -1]);
350    return 1;
351}
352