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-rw-r--r--src/corelib/io/qstorageinfo_linux_p.h205
1 files changed, 2 insertions, 203 deletions
diff --git a/src/corelib/io/qstorageinfo_linux_p.h b/src/corelib/io/qstorageinfo_linux_p.h
index 6f5e107ec6..b9da13aa0a 100644
--- a/src/corelib/io/qstorageinfo_linux_p.h
+++ b/src/corelib/io/qstorageinfo_linux_p.h
@@ -20,138 +20,12 @@
#include "qstorageinfo_p.h"
-#include <QtCore/qsystemdetection.h>
-#include <QtCore/private/qlocale_tools_p.h>
-
#include <sys/sysmacros.h> // makedev()
QT_BEGIN_NAMESPACE
-using namespace Qt::StringLiterals;
using MountInfo = QStorageInfoPrivate::MountInfo;
-static const char MountInfoPath[] = "/proc/self/mountinfo";
-
-static std::optional<dev_t> deviceNumber(QByteArrayView devno)
-{
- // major:minor
- auto it = devno.cbegin();
- auto r = qstrntoll(it, devno.size(), 10);
- if (!r.ok())
- return std::nullopt;
- int rdevmajor = int(r.result);
- it += r.used;
-
- if (*it != ':')
- return std::nullopt;
-
- r = qstrntoll(++it, devno.size() - r.used + 1, 10);
- if (!r.ok())
- return std::nullopt;
-
- return makedev(rdevmajor, r.result);
-}
-
-// Helper function to parse paths that the kernel inserts escape sequences
-// for.
-static QByteArray parseMangledPath(QByteArrayView path)
-{
- // The kernel escapes with octal the following characters:
- // space ' ', tab '\t', backslash '\\', and newline '\n'
- // See:
- // https://codebrowser.dev/linux/linux/fs/proc_namespace.c.html#show_mountinfo
- // https://codebrowser.dev/linux/linux/fs/seq_file.c.html#mangle_path
-
- QByteArray ret(path.size(), '\0');
- char *dst = ret.data();
- const char *src = path.data();
- const char *srcEnd = path.data() + path.size();
- while (src != srcEnd) {
- switch (*src) {
- case ' ': // Shouldn't happen
- return {};
-
- case '\\': {
- // It always uses exactly three octal characters.
- ++src;
- char c = (*src++ - '0') << 6;
- c |= (*src++ - '0') << 3;
- c |= (*src++ - '0');
- *dst++ = c;
- break;
- }
-
- default:
- *dst++ = *src++;
- break;
- }
- }
- // If "path" contains any of the characters this method is demangling,
- // "ret" would be oversized with extra '\0' characters at the end.
- ret.resize(dst - ret.data());
- return ret;
-}
-
-// Indexes into the "fields" std::array in parseMountInfo()
-// static constexpr short MountId = 0;
-// static constexpr short ParentId = 1;
-static constexpr short DevNo = 2;
-static constexpr short FsRoot = 3;
-static constexpr short MountPoint = 4;
-static constexpr short MountOptions = 5;
-// static constexpr short OptionalFields = 6;
-// static constexpr short Separator = 7;
-static constexpr short FsType = 8;
-static constexpr short MountSource = 9;
-static constexpr short SuperOptions = 10;
-static constexpr short FieldCount = 11;
-
-// Splits a line from /proc/self/mountinfo into fields; fields are separated
-// by a single space.
-static void tokenizeLine(std::array<QByteArrayView, FieldCount> &fields, QByteArrayView line)
-{
- size_t fieldIndex = 0;
- qsizetype from = 0;
- const char *begin = line.data();
- const qsizetype len = line.size();
- qsizetype spaceIndex = -1;
- while ((spaceIndex = line.indexOf(' ', from)) != -1 && fieldIndex < FieldCount) {
- fields[fieldIndex] = QByteArrayView{begin + from, begin + spaceIndex};
- from = spaceIndex;
-
- // Skip "OptionalFields" and Separator fields
- if (fieldIndex == MountOptions) {
- static constexpr char separatorField[] = " - ";
- const qsizetype sepIndex = line.indexOf(separatorField, from);
- if (sepIndex == -1) {
- qCWarning(lcStorageInfo,
- "Malformed line (missing '-' separator field) while parsing '%s':\n%s",
- MountInfoPath, line.constData());
- fields.fill({});
- return;
- }
-
- from = sepIndex + strlen(separatorField);
- // Continue parsing at FsType field
- fieldIndex = FsType;
- continue;
- }
-
- if (from + 1 < len)
- ++from; // Skip the space at spaceIndex
-
- ++fieldIndex;
- }
-
- // Currently we don't use the last field, so just check the index
- if (fieldIndex != SuperOptions) {
- qCInfo(lcStorageInfo,
- "Expected %d fields while parsing line from '%s', but found %zu instead:\n%.*s",
- FieldCount, MountInfoPath, fieldIndex, int(line.size()), line.data());
- fields.fill({});
- }
-}
-
// parseMountInfo() is called from:
// - QStorageInfoPrivate::initRootPath(), where a list of all mounted volumes is needed
// - QStorageInfoPrivate::mountedVolumes(), where some filesystem types are ignored
@@ -161,83 +35,8 @@ enum class FilterMountInfo {
Filtered,
};
-[[maybe_unused]] static std::vector<MountInfo>
-doParseMountInfo(const QByteArray &mountinfo, FilterMountInfo filter = FilterMountInfo::All)
-{
- // https://www.kernel.org/doc/Documentation/filesystems/proc.txt:
- // 36 35 98:0 /mnt1 /mnt2 rw,noatime master:1 - ext3 /dev/root rw,errors=continue
- // (1)(2)(3) (4) (5) (6) (7) (8) (9) (10) (11)
-
- auto it = mountinfo.cbegin();
- const auto end = mountinfo.cend();
- auto nextLine = [&it, &end]() -> QByteArrayView {
- auto nIt = std::find(it, end, '\n');
- if (nIt != end) {
- QByteArrayView ba(it, nIt);
- it = ++nIt; // Advance
- return ba;
- }
- return {};
- };
-
- std::vector<MountInfo> infos;
- std::array<QByteArrayView, FieldCount> fields;
- QByteArrayView line;
-
- auto checkField = [&line](QByteArrayView field) {
- if (field.isEmpty()) {
- qDebug("Failed to parse line from %s:\n%.*s", MountInfoPath, int(line.size()),
- line.data());
- return false;
- }
- return true;
- };
-
- // mountinfo has a stable format, no empty lines
- while (!(line = nextLine()).isEmpty()) {
- fields.fill({});
- tokenizeLine(fields, line);
-
- MountInfo info;
- QByteArray mountP = parseMangledPath(fields[MountPoint]);
- if (!checkField(mountP))
- continue;
- info.mountPoint = QFile::decodeName(mountP);
-
- if (!checkField(fields[FsType]))
- continue;
- info.fsType = fields[FsType].toByteArray();
-
- if (filter == FilterMountInfo::Filtered && !shouldIncludeFs(info.mountPoint, info.fsType))
- continue;
-
- std::optional<dev_t> devno = deviceNumber(fields[DevNo]);
- if (!devno) {
- checkField({});
- continue;
- }
- info.stDev = *devno;
-
- QByteArrayView fsRootView = fields[FsRoot];
- if (!checkField(fsRootView))
- continue;
-
- // If the filesystem root is "/" -- it's not a *sub*-volume/bind-mount,
- // in that case we leave info.fsRoot empty
- if (fsRootView != "/") {
- info.fsRoot = parseMangledPath(fsRootView);
- if (!checkField(info.fsRoot))
- continue;
- }
-
- info.device = parseMangledPath(fields[MountSource]);
- if (!checkField(info.device))
- continue;
-
- infos.push_back(std::move(info));
- }
- return infos;
-}
+Q_AUTOTEST_EXPORT std::vector<MountInfo> doParseMountInfo(
+ const QByteArray &mountinfo, FilterMountInfo filter = FilterMountInfo::All);
QT_END_NAMESPACE
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-08 13:42:39 +0000