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Make stat() work on device files again.

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FileDescriptor will now keep a pointer to the original inode even after
opening it resolves to a character device.

Fixed up /bin/ls to display major and minor device numbers instead of size
for device files.
This commit is contained in:
Andreas Kling 2019-01-31 05:05:57 +01:00
parent c3cc318028
commit c4fce9b3f9
Notes: sideshowbarker 2024-07-19 15:54:41 +09:00
8 changed files with 25 additions and 10 deletions
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6
Kernel/VirtualFileSystem.cpp
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@ -146,13 +146,15 @@ RetainPtr<FileDescriptor> VFS::open(const String& path, int& error, int options,
return nullptr;
}
auto metadata = inode->metadata();
if (metadata.isCharacterDevice()) {
if (!(options & O_DONT_OPEN_DEVICE) && metadata.isCharacterDevice()) {
auto it = m_character_devices.find(encodedDevice(metadata.majorDevice, metadata.minorDevice));
if (it == m_character_devices.end()) {
kprintf("VFS::open: no such character device %u,%u\n", metadata.majorDevice, metadata.minorDevice);
return nullptr;
}
return (*it).value->open(error, options);
auto descriptor = (*it).value->open(error, options);
descriptor->set_original_inode(Badge<VFS>(), move(inode));
return descriptor;
}
return FileDescriptor::create(move(inode));
}