Luna/kernel/src/fs/tmpfs/FileSystem.cpp

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#include "fs/tmpfs/FileSystem.h"
#include "fs/devices/DeviceRegistry.h"
#include "fs/tmpfs/Inode.h"
#include "thread/Clock.h"
#include <luna/Alloc.h>
#include <luna/CString.h>
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#include <luna/Ignore.h>
namespace TmpFS
{
Result<SharedPtr<VFS::FileSystem>> FileSystem::create()
{
SharedPtr<FileSystem> fs = TRY(adopt_shared_if_nonnull(new (std::nothrow) FileSystem()));
SharedPtr<VFS::Inode> root = TRY(fs->create_dir_inode({}, 0755));
fs->set_root(root);
return (SharedPtr<VFS::FileSystem>)fs;
}
Result<u64> FileSystem::allocate_inode_number()
{
return m_next_inode_number++;
}
Result<SharedPtr<VFS::Inode>> FileSystem::create_file_inode(mode_t mode)
{
SharedPtr<FileInode> inode = TRY(make_shared<FileInode>());
inode->set_fs(*this, {});
inode->set_inode_number(m_next_inode_number++, {});
inode->m_metadata.mode = mode;
g_realtime_clock.get_time(inode->m_metadata.mtime);
g_realtime_clock.get_time(inode->m_metadata.atime);
g_realtime_clock.get_time(inode->m_metadata.ctime);
return (SharedPtr<VFS::Inode>)inode;
}
Result<SharedPtr<VFS::Inode>> FileSystem::create_symlink_inode(StringView link)
{
SharedPtr<SymlinkInode> inode = TRY(make_shared<SymlinkInode>());
inode->set_fs(*this, {});
TRY(inode->set_link(link, {}));
inode->set_inode_number(m_next_inode_number++, {});
g_realtime_clock.get_time(inode->m_metadata.mtime);
g_realtime_clock.get_time(inode->m_metadata.atime);
g_realtime_clock.get_time(inode->m_metadata.ctime);
return (SharedPtr<VFS::Inode>)inode;
}
Result<SharedPtr<VFS::Inode>> FileSystem::create_dir_inode(SharedPtr<VFS::Inode> parent, mode_t mode)
{
SharedPtr<DirInode> inode = TRY(make_shared<DirInode>());
TRY(inode->add_entry(inode, "."));
TRY(inode->add_entry(parent ? parent : (SharedPtr<VFS::Inode>)inode, ".."));
inode->set_self(inode, {});
inode->set_fs(*this, {});
inode->set_inode_number(m_next_inode_number++, {});
inode->m_metadata.mode = mode;
g_realtime_clock.get_time(inode->m_metadata.mtime);
g_realtime_clock.get_time(inode->m_metadata.atime);
g_realtime_clock.get_time(inode->m_metadata.ctime);
return (SharedPtr<VFS::Inode>)inode;
}
Result<SharedPtr<VFS::Inode>> FileSystem::create_device_inode(u32 major, u32 minor, mode_t mode)
{
SharedPtr<Device> device = TRY(DeviceRegistry::fetch_special_device(major, minor));
SharedPtr<DeviceInode> inode = TRY(make_shared<DeviceInode>());
inode->set_fs(*this, {});
inode->set_inode_number(m_next_inode_number++, {});
inode->set_device(device, {});
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// FIXME: This should be queried from Device directly, but Device doesn't have an API to store and retrieve its
// device ID atm.
inode->set_device_id(luna_dev_makedev(major, minor), {});
inode->m_metadata.mode = mode;
g_realtime_clock.get_time(inode->m_metadata.mtime);
g_realtime_clock.get_time(inode->m_metadata.atime);
g_realtime_clock.get_time(inode->m_metadata.ctime);
inode->m_metadata.size = device->size();
return (SharedPtr<VFS::Inode>)inode;
}
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FileSystem::FileSystem()
{
m_host_device_id = DeviceRegistry::next_null_device_id();
}
Result<void> FileSystem::set_mount_dir(SharedPtr<VFS::Inode> parent)
{
return m_root_inode->replace_entry(parent, "..");
}
Result<void> FileSystem::reset_mount_dir()
{
return m_root_inode->replace_entry(m_root_inode, "..");
}
void FileSystem::set_root(SharedPtr<VFS::Inode> root)
{
m_root_inode = root;
}
}