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Add basic character device support. Start with null and zero.

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This commit is contained in:
Andreas Kling 2018-10-14 02:59:22 +02:00
parent fa3b11ac64
commit 93556d6743
Notes: sideshowbarker 2024-07-19 18:48:27 +09:00
14 changed files with 157 additions and 2 deletions
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22
VirtualFileSystem/VirtualFileSystem.cpp
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@ -7,6 +7,11 @@
//#define VFS_DEBUG
static dword encodedDevice(unsigned major, unsigned minor)
{
return (minor & 0xff) | (major << 8) | ((minor & ~0xff) << 12);
}
VirtualFileSystem::VirtualFileSystem()
{
m_maxNodeCount = 16;
@ -28,6 +33,17 @@ auto VirtualFileSystem::makeNode(InodeIdentifier inode) -> RetainPtr<Node>
if (!metadata.isValid())
return nullptr;
CharacterDevice* characterDevice = nullptr;
if (metadata.isCharacterDevice()) {
auto it = m_characterDevices.find(encodedDevice(metadata.majorDevice, metadata.minorDevice));
if (it != m_characterDevices.end()) {
characterDevice = (*it).value;
} else {
printf("[VFS] makeNode() no such character device %u,%u\n", metadata.majorDevice, metadata.minorDevice);
return nullptr;
}
}
auto vnode = allocateNode();
ASSERT(vnode);
@ -41,6 +57,7 @@ auto VirtualFileSystem::makeNode(InodeIdentifier inode) -> RetainPtr<Node>
#endif
m_inode2vnode.set(inode, vnode.ptr());
vnode->m_characterDevice = characterDevice;
return vnode;
}
@ -118,6 +135,7 @@ void VirtualFileSystem::freeNode(Node* node)
m_inode2vnode.remove(node->inode);
node->inode.fileSystem()->release();
node->inode = InodeIdentifier();
node->m_characterDevice = nullptr;
m_nodeFreeList.append(std::move(node));
}
@ -415,3 +433,7 @@ VirtualFileSystem::Mount::Mount(InodeIdentifier host, RetainPtr<FileSystem>&& gu
{
}
void VirtualFileSystem::registerCharacterDevice(unsigned major, unsigned minor, CharacterDevice& device)
{
m_characterDevices.set(encodedDevice(major, minor), &device);
}