summaryrefslogtreecommitdiffstats
path: root/src/corelib/io/qstorageinfo_unix.cpp
blob: ae5c42ffd114f2cd90c29c9ed281fe0f54e7a459 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
/****************************************************************************
**
** Copyright (C) 2014 Ivan Komissarov <ABBAPOH@gmail.com>
** Copyright (C) 2016 Intel Corporation.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCore module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qstorageinfo_p.h"

#include <QtCore/qdiriterator.h>
#include <QtCore/qfileinfo.h>
#include <QtCore/qtextstream.h>

#include <QtCore/private/qcore_unix_p.h>

#include <errno.h>
#include <sys/stat.h>

#if defined(Q_OS_BSD4)
#  include <sys/mount.h>
#  include <sys/statvfs.h>
#elif defined(Q_OS_ANDROID)
#  include <sys/mount.h>
#  include <sys/vfs.h>
#  include <mntent.h>
#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)
#  include <mntent.h>
#  include <sys/statvfs.h>
#elif defined(Q_OS_SOLARIS)
#  include <sys/mnttab.h>
#  include <sys/statvfs.h>
#elif defined(Q_OS_HAIKU)
#  include <Directory.h>
#  include <Path.h>
#  include <Volume.h>
#  include <VolumeRoster.h>
#  include <fs_info.h>
#  include <sys/statvfs.h>
#else
#  include <sys/statvfs.h>
#endif

#if defined(Q_OS_BSD4)
#  if defined(Q_OS_NETBSD)
#    define QT_STATFSBUF struct statvfs
#    define QT_STATFS    ::statvfs
#  else
#    define QT_STATFSBUF struct statfs
#    define QT_STATFS    ::statfs
#  endif

#  if !defined(ST_RDONLY)
#    define ST_RDONLY MNT_RDONLY
#  endif
#  if !defined(_STATFS_F_FLAGS) && !defined(Q_OS_NETBSD)
#    define _STATFS_F_FLAGS 1
#  endif
#elif defined(Q_OS_ANDROID)
#  define QT_STATFS    ::statfs
#  define QT_STATFSBUF struct statfs
#  if !defined(ST_RDONLY)
#    define ST_RDONLY 1 // hack for missing define on Android
#  endif
#elif defined(Q_OS_HAIKU)
#  define QT_STATFSBUF struct statvfs
#  define QT_STATFS    ::statvfs
#else
#  if defined(QT_LARGEFILE_SUPPORT)
#    define QT_STATFSBUF struct statvfs64
#    define QT_STATFS    ::statvfs64
#  else
#    define QT_STATFSBUF struct statvfs
#    define QT_STATFS    ::statvfs
#  endif // QT_LARGEFILE_SUPPORT
#endif // Q_OS_BSD4

QT_BEGIN_NAMESPACE

class QStorageIterator
{
public:
    QStorageIterator();
    ~QStorageIterator();

    inline bool isValid() const;
    inline bool next();
    inline QString rootPath() const;
    inline QByteArray fileSystemType() const;
    inline QByteArray device() const;
private:
#if defined(Q_OS_BSD4)
    QT_STATFSBUF *stat_buf;
    int entryCount;
    int currentIndex;
#elif defined(Q_OS_SOLARIS)
    FILE *fp;
    mnttab mnt;
#elif defined(Q_OS_ANDROID)
    QFile file;
    QByteArray m_rootPath;
    QByteArray m_fileSystemType;
    QByteArray m_device;
#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)
    FILE *fp;
    mntent mnt;
    QByteArray buffer;
#elif defined(Q_OS_HAIKU)
    BVolumeRoster m_volumeRoster;

    QByteArray m_rootPath;
    QByteArray m_fileSystemType;
    QByteArray m_device;
#endif
};

template <typename String>
static bool isParentOf(const String &parent, const QString &dirName)
{
    return dirName.startsWith(parent) &&
            (dirName.size() == parent.size() || dirName.at(parent.size()) == QLatin1Char('/') ||
             parent.size() == 1);
}

static bool shouldIncludeFs(const QStorageIterator &it)
{
    /*
     * This function implements a heuristic algorithm to determine whether a
     * given mount should be reported to the user. Our objective is to list
     * only entries that the end-user would find useful.
     *
     * We therefore ignore:
     *  - mounted in /dev, /proc, /sys: special mounts
     *    (this will catch /sys/fs/cgroup, /proc/sys/fs/binfmt_misc, /dev/pts,
     *    some of which are tmpfs on Linux)
     *  - mounted in /var/run or /var/lock: most likely pseudofs
     *    (on earlier systemd versions, /var/run was a bind-mount of /run, so
     *    everything would be unnecessarily duplicated)
     *  - filesystem type is "rootfs": artifact of the root-pivot on some Linux
     *    initrd
     *  - if the filesystem total size is zero, it's a pseudo-fs (not checked here).
     */

    QString mountDir = it.rootPath();
    if (isParentOf(QLatin1String("/dev"), mountDir)
        || isParentOf(QLatin1String("/proc"), mountDir)
        || isParentOf(QLatin1String("/sys"), mountDir)
        || isParentOf(QLatin1String("/var/run"), mountDir)
        || isParentOf(QLatin1String("/var/lock"), mountDir)) {
        return false;
    }

#ifdef Q_OS_LINUX
    if (it.fileSystemType() == "rootfs")
        return false;
#endif

    // size checking in mountedVolumes()
    return true;
}

#if defined(Q_OS_BSD4)

inline QStorageIterator::QStorageIterator()
    : entryCount(::getmntinfo(&stat_buf, 0)),
      currentIndex(-1)
{
}

inline QStorageIterator::~QStorageIterator()
{
}

inline bool QStorageIterator::isValid() const
{
    return entryCount != -1;
}

inline bool QStorageIterator::next()
{
    return ++currentIndex < entryCount;
}

inline QString QStorageIterator::rootPath() const
{
    return QFile::decodeName(stat_buf[currentIndex].f_mntonname);
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return QByteArray(stat_buf[currentIndex].f_fstypename);
}

inline QByteArray QStorageIterator::device() const
{
    return QByteArray(stat_buf[currentIndex].f_mntfromname);
}

#elif defined(Q_OS_SOLARIS)

static const char pathMounted[] = "/etc/mnttab";

inline QStorageIterator::QStorageIterator()
{
    const int fd = qt_safe_open(pathMounted, O_RDONLY);
    fp = ::fdopen(fd, "r");
}

inline QStorageIterator::~QStorageIterator()
{
    if (fp)
        ::fclose(fp);
}

inline bool QStorageIterator::isValid() const
{
    return fp != Q_NULLPTR;
}

inline bool QStorageIterator::next()
{
    return ::getmntent(fp, &mnt) == 0;
}

inline QString QStorageIterator::rootPath() const
{
    return QFile::decodeName(mnt.mnt_mountp);
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return QByteArray(mnt.mnt_fstype);
}

inline QByteArray QStorageIterator::device() const
{
    return QByteArray(mnt.mnt_mntopts);
}

#elif defined(Q_OS_ANDROID)

static const QLatin1String pathMounted("/proc/mounts");

inline QStorageIterator::QStorageIterator()
{
    file.setFileName(pathMounted);
    file.open(QIODevice::ReadOnly | QIODevice::Text);
}

inline QStorageIterator::~QStorageIterator()
{
}

inline bool QStorageIterator::isValid() const
{
    return file.isOpen();
}

inline bool QStorageIterator::next()
{
    QList<QByteArray> data;
    do {
        const QByteArray line = file.readLine();
        data = line.split(' ');
    } while (data.count() < 3 && !file.atEnd());

    if (file.atEnd())
        return false;
    m_device = data.at(0);
    m_rootPath = data.at(1);
    m_fileSystemType = data.at(2);

    return true;
}

inline QString QStorageIterator::rootPath() const
{
    return QFile::decodeName(m_rootPath);
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return m_fileSystemType;
}

inline QByteArray QStorageIterator::device() const
{
    return m_device;
}

#elif defined(Q_OS_LINUX) || defined(Q_OS_HURD)

static const char pathMounted[] = "/etc/mtab";
static const int bufferSize = 1024; // 2 paths (mount point+device) and metainfo;
                                    // should be enough

inline QStorageIterator::QStorageIterator() :
    buffer(QByteArray(bufferSize, 0))
{
    fp = ::setmntent(pathMounted, "r");
}

inline QStorageIterator::~QStorageIterator()
{
    if (fp)
        ::endmntent(fp);
}

inline bool QStorageIterator::isValid() const
{
    return fp != Q_NULLPTR;
}

inline bool QStorageIterator::next()
{
    return ::getmntent_r(fp, &mnt, buffer.data(), buffer.size()) != Q_NULLPTR;
}

inline QString QStorageIterator::rootPath() const
{
    return QFile::decodeName(mnt.mnt_dir);
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return QByteArray(mnt.mnt_type);
}

inline QByteArray QStorageIterator::device() const
{
    return QByteArray(mnt.mnt_fsname);
}

#elif defined(Q_OS_HAIKU)
inline QStorageIterator::QStorageIterator()
{
}

inline QStorageIterator::~QStorageIterator()
{
}

inline bool QStorageIterator::isValid() const
{
    return true;
}

inline bool QStorageIterator::next()
{
    BVolume volume;

    if (m_volumeRoster.GetNextVolume(&volume) != B_OK)
        return false;

    BDirectory directory;
    if (volume.GetRootDirectory(&directory) != B_OK)
        return false;

    const BPath path(&directory);

    fs_info fsInfo;
    memset(&fsInfo, 0, sizeof(fsInfo));

    if (fs_stat_dev(volume.Device(), &fsInfo) != 0)
        return false;

    m_rootPath = path.Path();
    m_fileSystemType = QByteArray(fsInfo.fsh_name);

    const QByteArray deviceName(fsInfo.device_name);
    m_device = (deviceName.isEmpty() ? QByteArray::number(qint32(volume.Device())) : deviceName);

    return true;
}

inline QString QStorageIterator::rootPath() const
{
    return QFile::decodeName(m_rootPath);
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return m_fileSystemType;
}

inline QByteArray QStorageIterator::device() const
{
    return m_device;
}

#else

inline QStorageIterator::QStorageIterator()
{
}

inline QStorageIterator::~QStorageIterator()
{
}

inline bool QStorageIterator::isValid() const
{
    return false;
}

inline bool QStorageIterator::next()
{
    return false;
}

inline QString QStorageIterator::rootPath() const
{
    return QString();
}

inline QByteArray QStorageIterator::fileSystemType() const
{
    return QByteArray();
}

inline QByteArray QStorageIterator::device() const
{
    return QByteArray();
}

#endif

void QStorageInfoPrivate::initRootPath()
{
    rootPath = QFileInfo(rootPath).canonicalFilePath();

    if (rootPath.isEmpty())
        return;

    QStorageIterator it;
    if (!it.isValid()) {
        rootPath = QStringLiteral("/");
        return;
    }

    int maxLength = 0;
    const QString oldRootPath = rootPath;
    rootPath.clear();

    while (it.next()) {
        const QString mountDir = it.rootPath();
        const QByteArray fsName = it.fileSystemType();
        // we try to find most suitable entry
        if (isParentOf(mountDir, oldRootPath) && maxLength < mountDir.length()) {
            maxLength = mountDir.length();
            rootPath = mountDir;
            device = it.device();
            fileSystemType = fsName;
        }
    }
}

static inline QString retrieveLabel(const QByteArray &device)
{
#ifdef Q_OS_LINUX
    static const char pathDiskByLabel[] = "/dev/disk/by-label";

    QFileInfo devinfo(QFile::decodeName(device));
    QString devicePath = devinfo.canonicalFilePath();

    QDirIterator it(QLatin1String(pathDiskByLabel), QDir::NoDotAndDotDot);
    while (it.hasNext()) {
        it.next();
        QFileInfo fileInfo(it.fileInfo());
        if (fileInfo.isSymLink() && fileInfo.symLinkTarget() == devicePath)
            return fileInfo.fileName();
    }
#elif defined Q_OS_HAIKU
    fs_info fsInfo;
    memset(&fsInfo, 0, sizeof(fsInfo));

    int32 pos = 0;
    dev_t dev;
    while ((dev = next_dev(&pos)) >= 0) {
        if (fs_stat_dev(dev, &fsInfo) != 0)
            continue;

        if (qstrcmp(fsInfo.device_name, device.constData()) == 0)
            return QString::fromLocal8Bit(fsInfo.volume_name);
    }
#else
    Q_UNUSED(device);
#endif

    return QString();
}

void QStorageInfoPrivate::doStat()
{
    initRootPath();
    if (rootPath.isEmpty())
        return;

    retrieveVolumeInfo();
    name = retrieveLabel(device);
}

void QStorageInfoPrivate::retrieveVolumeInfo()
{
    QT_STATFSBUF statfs_buf;
    int result;
    EINTR_LOOP(result, QT_STATFS(QFile::encodeName(rootPath).constData(), &statfs_buf));
    if (result == 0) {
        valid = true;
        ready = true;

#if defined(Q_OS_INTEGRITY) || (defined(Q_OS_BSD4) && !defined(Q_OS_NETBSD))
        bytesTotal = statfs_buf.f_blocks * statfs_buf.f_bsize;
        bytesFree = statfs_buf.f_bfree * statfs_buf.f_bsize;
        bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_bsize;
#else
        bytesTotal = statfs_buf.f_blocks * statfs_buf.f_frsize;
        bytesFree = statfs_buf.f_bfree * statfs_buf.f_frsize;
        bytesAvailable = statfs_buf.f_bavail * statfs_buf.f_frsize;
#endif
        blockSize = statfs_buf.f_bsize;
#if defined(Q_OS_ANDROID) || defined(Q_OS_BSD4) || defined(Q_OS_INTEGRITY)
#if defined(_STATFS_F_FLAGS)
        readOnly = (statfs_buf.f_flags & ST_RDONLY) != 0;
#endif
#else
        readOnly = (statfs_buf.f_flag & ST_RDONLY) != 0;
#endif
    }
}

QList<QStorageInfo> QStorageInfoPrivate::mountedVolumes()
{
    QStorageIterator it;
    if (!it.isValid())
        return QList<QStorageInfo>() << root();

    QList<QStorageInfo> volumes;

    while (it.next()) {
        if (!shouldIncludeFs(it))
            continue;

        const QString mountDir = it.rootPath();
        QStorageInfo info(mountDir);
        if (info.bytesTotal() == 0)
            continue;
        volumes.append(info);
    }

    return volumes;
}

QStorageInfo QStorageInfoPrivate::root()
{
    return QStorageInfo(QStringLiteral("/"));
}

QT_END_NAMESPACE