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Lots of hacking to make a very simple "ls" utility.

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I added a dead-simple malloc that only allows allocations < 4096 bytes.
It just forwards the request to mmap() every time.

I also added simplified versions of opendir() and readdir().
This commit is contained in:
Andreas Kling 2018-10-24 12:43:52 +02:00
parent 0c5bbac86e
commit bca4b71bfa
Notes: sideshowbarker 2024-07-19 18:39:29 +09:00
19 changed files with 277 additions and 67 deletions
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19
VirtualFileSystem/VirtualFileSystem.cpp
View file

@ -78,6 +78,7 @@ auto VirtualFileSystem::makeNode(InodeIdentifier inode) -> RetainPtr<Node>
fileSystem->retain();
vnode->inode = inode;
vnode->m_cachedMetadata = { };
#ifdef VFS_DEBUG
kprintf("makeNode: inode=%u, size=%u, mode=%o, uid=%u, gid=%u\n", inode.index(), metadata.size, metadata.mode, metadata.uid, metadata.gid);
@ -85,6 +86,7 @@ auto VirtualFileSystem::makeNode(InodeIdentifier inode) -> RetainPtr<Node>
m_inode2vnode.set(inode, vnode.ptr());
vnode->m_characterDevice = characterDevice;
return vnode;
}
@ -151,7 +153,7 @@ auto VirtualFileSystem::allocateNode() -> RetainPtr<Node>
auto* node = m_nodeFreeList.takeLast();
ASSERT(node->retainCount == 0);
node->retainCount = 1;
node->vfs = this;
node->m_vfs = this;
return adopt(*node);
}
@ -198,8 +200,7 @@ bool VirtualFileSystem::isRoot(InodeIdentifier inode) const
return inode == m_rootNode->inode;
}
template<typename F>
void VirtualFileSystem::enumerateDirectoryInode(InodeIdentifier directoryInode, F func)
void VirtualFileSystem::enumerateDirectoryInode(InodeIdentifier directoryInode, Function<bool(const FileSystem::DirectoryEntry&)> callback)
{
if (!directoryInode.isValid())
return;
@ -216,7 +217,7 @@ void VirtualFileSystem::enumerateDirectoryInode(InodeIdentifier directoryInode,
ASSERT(mount);
resolvedInode = mount->host();
}
func({ entry.name, resolvedInode });
callback({ entry.name, resolvedInode });
return true;
});
}
@ -340,6 +341,7 @@ void VirtualFileSystem::listDirectoryRecursively(const String& path)
} else {
kprintf("%s/%s\n", path.characters(), entry.name.characters());
}
return true;
});
}
@ -467,10 +469,17 @@ void VirtualFileSystem::Node::release()
{
ASSERT(retainCount);
if (--retainCount == 0) {
vfs->freeNode(this);
m_vfs->freeNode(this);
}
}
const InodeMetadata& VirtualFileSystem::Node::metadata() const
{
if (!m_cachedMetadata.isValid())
m_cachedMetadata = inode.metadata();
return m_cachedMetadata;
}
VirtualFileSystem::Mount::Mount(InodeIdentifier host, RetainPtr<FileSystem>&& guestFileSystem)
: m_host(host)
, m_guest(guestFileSystem->rootInode())