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https://github.com/RGBCube/serenity
synced 2025-07-27 06:07:34 +00:00
FileSystem: Port most of the code over to using custodies.
The current working directory is now stored as a custody. Likewise for a process executable file. This unbreaks /proc/PID/fd which has not been working since we made the filesystem bigger. This still needs a bunch of work, for instance when renaming or removing a file somewhere, we have to update the relevant custody links.
This commit is contained in:
Andreas Kling
parent
4cb87b1753
commit
393851418b
11 changed files with 280 additions and 220 deletions
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@ -1,4 +1,5 @@
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#include <AK/HashTable.h>
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#include <AK/StringBuilder.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/Lock.h>
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@ -25,3 +26,16 @@ Custody::~Custody()
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LOCKER(all_custodies().lock());
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all_custodies().resource().remove(this);
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}
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String Custody::absolute_path() const
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{
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Vector<const Custody*, 32> custody_chain;
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for (auto* custody = this; custody; custody = custody->parent())
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custody_chain.append(custody);
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StringBuilder builder;
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for (int i = custody_chain.size() - 2; i >= 0; --i) {
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builder.append('/');
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builder.append(custody_chain[i]->name().characters());
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}
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return builder.to_string();
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}
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@ -23,6 +23,8 @@ public:
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const String& name() const { return m_name; }
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String absolute_path() const;
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private:
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Custody(Custody* parent, const String& name, Inode&);
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@ -1,6 +1,7 @@
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#include <AK/BufferStream.h>
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#include <Kernel/Devices/BlockDevice.h>
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#include <Kernel/Devices/CharacterDevice.h>
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FIFO.h>
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#include <Kernel/FileSystem/FileDescriptor.h>
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#include <Kernel/FileSystem/FileSystem.h>
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@ -14,9 +15,11 @@
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#include <Kernel/VM/MemoryManager.h>
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#include <LibC/errno_numbers.h>
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Retained<FileDescriptor> FileDescriptor::create(RetainPtr<Inode>&& inode)
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Retained<FileDescriptor> FileDescriptor::create(RetainPtr<Custody>&& custody)
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{
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return adopt(*new FileDescriptor(InodeFile::create(*inode)));
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auto descriptor = adopt(*new FileDescriptor(InodeFile::create(custody->inode())));
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descriptor->m_custody = move(custody);
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return descriptor;
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}
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Retained<FileDescriptor> FileDescriptor::create(RetainPtr<File>&& file, SocketRole role)
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@ -62,6 +65,7 @@ Retained<FileDescriptor> FileDescriptor::clone()
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descriptor = fifo()->open_direction(m_fifo_direction);
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} else {
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descriptor = FileDescriptor::create(m_file.copy_ref(), m_socket_role);
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descriptor->m_custody = m_custody.copy_ref();
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descriptor->m_inode = m_inode.copy_ref();
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}
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ASSERT(descriptor);
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@ -102,7 +106,7 @@ KResult FileDescriptor::fchmod(mode_t mode)
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{
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if (!m_inode)
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return KResult(-EBADF);
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return VFS::the().chmod(*m_inode, mode);
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return VFS::the().fchmod(*m_inode, mode);
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}
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off_t FileDescriptor::seek(off_t offset, int whence)
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@ -259,6 +263,9 @@ int FileDescriptor::close()
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KResultOr<String> FileDescriptor::absolute_path()
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{
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if (m_custody)
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return m_custody->absolute_path();
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dbgprintf("FileDescriptor::absolute_path() for FD without custody, File type: %s\n", m_file->class_name());
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return m_file->absolute_path(*this);
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}
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@ -21,7 +21,7 @@ class SharedMemory;
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class FileDescriptor : public Retainable<FileDescriptor> {
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public:
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static Retained<FileDescriptor> create(RetainPtr<Inode>&&);
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static Retained<FileDescriptor> create(RetainPtr<Custody>&&);
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static Retained<FileDescriptor> create(RetainPtr<File>&&, SocketRole = SocketRole::None);
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~FileDescriptor();
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@ -64,6 +64,9 @@ public:
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Inode* inode() { return m_inode.ptr(); }
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const Inode* inode() const { return m_inode.ptr(); }
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Custody* custody() { return m_custody.ptr(); }
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const Custody* custody() const { return m_custody.ptr(); }
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KResultOr<Region*> mmap(Process&, LinearAddress, size_t offset, size_t, int prot);
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bool is_blocking() const { return m_is_blocking; }
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@ -103,6 +106,7 @@ private:
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FileDescriptor(RetainPtr<File>&&, SocketRole = SocketRole::None);
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FileDescriptor(FIFO&, FIFO::Direction);
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RetainPtr<Custody> m_custody;
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RetainPtr<Inode> m_inode;
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RetainPtr<File> m_file;
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@ -1,5 +1,6 @@
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#include "ProcFS.h"
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#include "Process.h"
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#include <Kernel/FileSystem/Custody.h>
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#include <Kernel/FileSystem/FileDescriptor.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/VM/MemoryManager.h>
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@ -359,12 +360,9 @@ ByteBuffer procfs$pid_exe(InodeIdentifier identifier)
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if (!handle)
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return { };
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auto& process = handle->process();
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auto inode = process.executable_inode();
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ASSERT(inode);
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auto result = VFS::the().absolute_path(*inode);
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if (result.is_error())
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return { };
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return result.value().to_byte_buffer();
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auto* custody = process.executable_custody();
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ASSERT(custody);
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return custody->absolute_path().to_byte_buffer();
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}
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ByteBuffer procfs$pid_cwd(InodeIdentifier identifier)
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@ -372,10 +370,7 @@ ByteBuffer procfs$pid_cwd(InodeIdentifier identifier)
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auto handle = ProcessInspectionHandle::from_pid(to_pid(identifier));
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if (!handle)
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return { };
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auto result = VFS::the().absolute_path(handle->process().cwd_inode());
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if (result.is_error())
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return { };
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return result.value().to_byte_buffer();
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return handle->process().cwd_custody().absolute_path().to_byte_buffer();
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}
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ByteBuffer procfs$self(InodeIdentifier)
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@ -958,7 +953,7 @@ bool ProcFSInode::traverse_as_directory(Function<bool(const FS::DirectoryEntry&)
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auto& process = handle->process();
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for (auto& entry : fs().m_entries) {
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if (entry.proc_file_type > __FI_PID_Start && entry.proc_file_type < __FI_PID_End) {
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if (entry.proc_file_type == FI_PID_exe && !process.executable_inode())
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if (entry.proc_file_type == FI_PID_exe && !process.executable_custody())
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continue;
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// FIXME: strlen() here is sad.
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callback({ entry.name, (int)strlen(entry.name), to_identifier(fsid(), PDI_PID, pid, (ProcFileType)entry.proc_file_type), 0 });
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@ -1039,7 +1034,7 @@ InodeIdentifier ProcFSInode::lookup(const String& name)
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auto& process = handle->process();
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for (auto& entry : fs().m_entries) {
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if (entry.proc_file_type > __FI_PID_Start && entry.proc_file_type < __FI_PID_End) {
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if (entry.proc_file_type == FI_PID_exe && !process.executable_inode())
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if (entry.proc_file_type == FI_PID_exe && !process.executable_custody())
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continue;
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if (entry.name == nullptr)
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continue;
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@ -121,7 +121,7 @@ void VFS::traverse_directory_inode(Inode& dir_inode, Function<bool(const FS::Dir
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});
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}
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KResult VFS::utime(StringView path, Inode& base, time_t atime, time_t mtime)
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KResult VFS::utime(StringView path, Custody& base, time_t atime, time_t mtime)
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{
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auto descriptor_or_error = VFS::the().open(move(path), 0, 0, base);
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if (descriptor_or_error.is_error())
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@ -141,28 +141,29 @@ KResult VFS::utime(StringView path, Inode& base, time_t atime, time_t mtime)
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return KSuccess;
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}
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KResult VFS::stat(StringView path, int options, Inode& base, struct stat& statbuf)
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KResult VFS::stat(StringView path, int options, Custody& base, struct stat& statbuf)
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{
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auto inode_or_error = resolve_path_to_inode(path, base, nullptr, options);
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if (inode_or_error.is_error())
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return inode_or_error.error();
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return FileDescriptor::create(inode_or_error.value().ptr())->fstat(statbuf);
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auto custody_or_error = resolve_path_to_custody(path, base, nullptr, options);
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if (custody_or_error.is_error())
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return custody_or_error.error();
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return FileDescriptor::create(custody_or_error.value().ptr())->fstat(statbuf);
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}
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KResultOr<Retained<FileDescriptor>> VFS::open(StringView path, int options, mode_t mode, Inode& base)
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KResultOr<Retained<FileDescriptor>> VFS::open(StringView path, int options, mode_t mode, Custody& base)
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{
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auto inode_or_error = resolve_path_to_inode(path, base, nullptr, options);
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auto custody_or_error = resolve_path_to_custody(path, base, nullptr, options);
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if (options & O_CREAT) {
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if (inode_or_error.is_error())
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if (custody_or_error.is_error())
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return create(path, options, mode, base);
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if (options & O_EXCL)
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return KResult(-EEXIST);
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}
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if (inode_or_error.is_error())
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return inode_or_error.error();
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto inode = inode_or_error.value();
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auto metadata = inode->metadata();
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auto& custody = *custody_or_error.value();
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auto& inode = custody.inode();
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auto metadata = inode.metadata();
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bool should_truncate_file = false;
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@ -188,41 +189,42 @@ KResultOr<Retained<FileDescriptor>> VFS::open(StringView path, int options, mode
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auto descriptor_or_error = (*it).value->open(options);
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if (descriptor_or_error.is_error())
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return descriptor_or_error.error();
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descriptor_or_error.value()->set_original_inode(Badge<VFS>(), *inode);
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descriptor_or_error.value()->set_original_inode(Badge<VFS>(), inode);
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return descriptor_or_error;
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}
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if (should_truncate_file)
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inode->truncate(0);
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return FileDescriptor::create(*inode);
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inode.truncate(0);
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return FileDescriptor::create(custody);
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}
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KResult VFS::mknod(StringView path, mode_t mode, dev_t dev, Inode& base)
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KResult VFS::mknod(StringView path, mode_t mode, dev_t dev, Custody& base)
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{
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if (!is_regular_file(mode) && !is_block_device(mode) && !is_character_device(mode) && !is_fifo(mode) && !is_socket(mode))
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return KResult(-EINVAL);
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RetainPtr<Inode> parent_inode;
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auto existing_file_or_error = resolve_path_to_inode(path, base, &parent_inode);
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RetainPtr<Custody> parent_custody;
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auto existing_file_or_error = resolve_path_to_custody(path, base, &parent_custody);
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if (!existing_file_or_error.is_error())
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return KResult(-EEXIST);
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if (!parent_inode)
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if (!parent_custody)
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return KResult(-ENOENT);
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if (existing_file_or_error.error() != -ENOENT)
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return existing_file_or_error.error();
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if (!parent_inode->metadata().may_write(current->process()))
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auto& parent_inode = parent_custody->inode();
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if (!parent_inode.metadata().may_write(current->process()))
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return KResult(-EACCES);
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FileSystemPath p(path);
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dbgprintf("VFS::mknod: '%s' mode=%o dev=%u in %u:%u\n", p.basename().characters(), mode, dev, parent_inode->fsid(), parent_inode->index());
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dbgprintf("VFS::mknod: '%s' mode=%o dev=%u in %u:%u\n", p.basename().characters(), mode, dev, parent_inode.fsid(), parent_inode.index());
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int error;
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auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), mode, 0, dev, error);
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auto new_file = parent_inode.fs().create_inode(parent_inode.identifier(), p.basename(), mode, 0, dev, error);
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if (!new_file)
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return KResult(error);
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return KSuccess;
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}
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KResultOr<Retained<FileDescriptor>> VFS::create(StringView path, int options, mode_t mode, Inode& base)
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KResultOr<Retained<FileDescriptor>> VFS::create(StringView path, int options, mode_t mode, Custody& base)
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{
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(void)options;
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@ -231,57 +233,61 @@ KResultOr<Retained<FileDescriptor>> VFS::create(StringView path, int options, mo
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mode |= 0100000;
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}
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RetainPtr<Inode> parent_inode;
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auto existing_file_or_error = resolve_path_to_inode(path, base, &parent_inode);
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if (!existing_file_or_error.is_error())
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RetainPtr<Custody> parent_custody;
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auto existing_custody_or_error = resolve_path_to_custody(path, base, &parent_custody);
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if (!existing_custody_or_error.is_error())
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return KResult(-EEXIST);
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if (!parent_inode)
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if (!parent_custody)
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return KResult(-ENOENT);
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if (existing_file_or_error.error() != -ENOENT)
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return existing_file_or_error.error();
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if (!parent_inode->metadata().may_write(current->process()))
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auto& parent_inode = parent_custody->inode();
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if (existing_custody_or_error.error() != -ENOENT)
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return existing_custody_or_error.error();
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if (!parent_inode.metadata().may_write(current->process()))
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return KResult(-EACCES);
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FileSystemPath p(path);
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dbgprintf("VFS::create_file: '%s' in %u:%u\n", p.basename().characters(), parent_inode->fsid(), parent_inode->index());
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dbgprintf("VFS::create_file: '%s' in %u:%u\n", p.basename().characters(), parent_inode.fsid(), parent_inode.index());
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int error;
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auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), mode, 0, 0, error);
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auto new_file = parent_inode.fs().create_inode(parent_inode.identifier(), p.basename(), mode, 0, 0, error);
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if (!new_file)
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return KResult(error);
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return FileDescriptor::create(move(new_file));
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auto new_custody = Custody::create(parent_custody, p.basename(), *new_file);
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return FileDescriptor::create(*new_custody);
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}
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KResult VFS::mkdir(StringView path, mode_t mode, Inode& base)
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KResult VFS::mkdir(StringView path, mode_t mode, Custody& base)
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{
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RetainPtr<Inode> parent_inode;
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auto result = resolve_path_to_inode(path, base, &parent_inode);
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RetainPtr<Custody> parent_custody;
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auto result = resolve_path_to_custody(path, base, &parent_custody);
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if (!result.is_error())
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return KResult(-EEXIST);
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if (!parent_inode)
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if (!parent_custody)
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return KResult(-ENOENT);
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if (result.error() != -ENOENT)
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return result.error();
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if (!parent_inode->metadata().may_write(current->process()))
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auto& parent_inode = parent_custody->inode();
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if (!parent_inode.metadata().may_write(current->process()))
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return KResult(-EACCES);
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FileSystemPath p(path);
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dbgprintf("VFS::mkdir: '%s' in %u:%u\n", p.basename().characters(), parent_inode->fsid(), parent_inode->index());
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dbgprintf("VFS::mkdir: '%s' in %u:%u\n", p.basename().characters(), parent_inode.fsid(), parent_inode.index());
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int error;
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auto new_dir = parent_inode->fs().create_directory(parent_inode->identifier(), p.basename(), mode, error);
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auto new_dir = parent_inode.fs().create_directory(parent_inode.identifier(), p.basename(), mode, error);
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if (new_dir)
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return KSuccess;
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return KResult(error);
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}
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KResult VFS::access(StringView path, int mode, Inode& base)
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KResult VFS::access(StringView path, int mode, Custody& base)
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{
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auto inode_or_error = resolve_path_to_inode(path, base);
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if (inode_or_error.is_error())
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return inode_or_error.error();
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auto inode = inode_or_error.value();
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auto metadata = inode->metadata();
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auto custody_or_error = resolve_path_to_custody(path, base);
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& custody = *custody_or_error.value();
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auto& inode = custody.inode();
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auto metadata = inode.metadata();
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if (mode & R_OK) {
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if (!metadata.may_read(current->process()))
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return KResult(-EACCES);
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@ -297,20 +303,21 @@ KResult VFS::access(StringView path, int mode, Inode& base)
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return KSuccess;
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}
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KResultOr<Retained<Inode>> VFS::open_directory(StringView path, Inode& base)
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KResultOr<Retained<Custody>> VFS::open_directory(StringView path, Custody& base)
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{
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auto inode_or_error = resolve_path_to_inode(path, base);
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auto inode_or_error = resolve_path_to_custody(path, base);
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if (inode_or_error.is_error())
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return inode_or_error.error();
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auto inode = inode_or_error.value();
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if (!inode->is_directory())
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auto& custody = *inode_or_error.value();
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auto& inode = custody.inode();
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if (!inode.is_directory())
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return KResult(-ENOTDIR);
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if (!inode->metadata().may_execute(current->process()))
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if (!inode.metadata().may_execute(current->process()))
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return KResult(-EACCES);
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return Retained<Inode>(*inode);
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||||
return custody;
|
||||
}
|
||||
|
||||
KResult VFS::chmod(Inode& inode, mode_t mode)
|
||||
KResult VFS::fchmod(Inode& inode, mode_t mode)
|
||||
{
|
||||
if (inode.fs().is_readonly())
|
||||
return KResult(-EROFS);
|
||||
|
|
@ -323,83 +330,90 @@ KResult VFS::chmod(Inode& inode, mode_t mode)
|
|||
return inode.chmod(mode);
|
||||
}
|
||||
|
||||
KResult VFS::chmod(StringView path, mode_t mode, Inode& base)
|
||||
KResult VFS::chmod(StringView path, mode_t mode, Custody& base)
|
||||
{
|
||||
auto inode_or_error = resolve_path_to_inode(path, base);
|
||||
if (inode_or_error.is_error())
|
||||
return inode_or_error.error();
|
||||
auto inode = inode_or_error.value();
|
||||
return chmod(*inode, mode);
|
||||
auto custody_or_error = resolve_path_to_custody(path, base);
|
||||
if (custody_or_error.is_error())
|
||||
return custody_or_error.error();
|
||||
auto& custody = *custody_or_error.value();
|
||||
auto& inode = custody.inode();
|
||||
return fchmod(inode, mode);
|
||||
}
|
||||
|
||||
KResult VFS::rename(StringView old_path, StringView new_path, Inode& base)
|
||||
KResult VFS::rename(StringView old_path, StringView new_path, Custody& base)
|
||||
{
|
||||
RetainPtr<Inode> old_parent_inode;
|
||||
auto old_inode_or_error = resolve_path_to_inode(old_path, base, &old_parent_inode);
|
||||
if (old_inode_or_error.is_error())
|
||||
return old_inode_or_error.error();
|
||||
auto old_inode = old_inode_or_error.value();
|
||||
RetainPtr<Custody> old_parent_custody;
|
||||
auto old_custody_or_error = resolve_path_to_custody(old_path, base, &old_parent_custody);
|
||||
if (old_custody_or_error.is_error())
|
||||
return old_custody_or_error.error();
|
||||
auto& old_custody = *old_custody_or_error.value();
|
||||
auto& old_inode = old_custody.inode();
|
||||
|
||||
RetainPtr<Inode> new_parent_inode;
|
||||
auto new_inode_or_error = resolve_path_to_inode(new_path, base, &new_parent_inode);
|
||||
if (new_inode_or_error.is_error()) {
|
||||
if (new_inode_or_error.error() != -ENOENT)
|
||||
return new_inode_or_error.error();
|
||||
RetainPtr<Custody> new_parent_custody;
|
||||
auto new_custody_or_error = resolve_path_to_custody(new_path, base, &new_parent_custody);
|
||||
if (new_custody_or_error.is_error()) {
|
||||
if (new_custody_or_error.error() != -ENOENT)
|
||||
return new_custody_or_error.error();
|
||||
}
|
||||
|
||||
if (!new_parent_inode->metadata().may_write(current->process()))
|
||||
auto& old_parent_inode = old_parent_custody->inode();
|
||||
auto& new_parent_inode = new_parent_custody->inode();
|
||||
|
||||
if (!new_parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
if (!old_parent_inode->metadata().may_write(current->process()))
|
||||
if (!old_parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
if (old_parent_inode->metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && old_inode->metadata().uid != current->process().euid())
|
||||
if (old_parent_inode.metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && old_inode.metadata().uid != current->process().euid())
|
||||
return KResult(-EACCES);
|
||||
}
|
||||
|
||||
if (!new_inode_or_error.is_error()) {
|
||||
auto new_inode = new_inode_or_error.value();
|
||||
if (!new_custody_or_error.is_error()) {
|
||||
auto& new_custody = *new_custody_or_error.value();
|
||||
auto& new_inode = new_custody.inode();
|
||||
// FIXME: Is this really correct? Check what other systems do.
|
||||
if (new_inode == old_inode)
|
||||
if (&new_inode == &old_inode)
|
||||
return KSuccess;
|
||||
if (new_parent_inode->metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && new_inode->metadata().uid != current->process().euid())
|
||||
if (new_parent_inode.metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && new_inode.metadata().uid != current->process().euid())
|
||||
return KResult(-EACCES);
|
||||
}
|
||||
if (new_inode->is_directory() && !old_inode->is_directory())
|
||||
if (new_inode.is_directory() && !old_inode.is_directory())
|
||||
return KResult(-EISDIR);
|
||||
auto result = new_parent_inode->remove_child(FileSystemPath(new_path).basename());
|
||||
auto result = new_parent_inode.remove_child(FileSystemPath(new_path).basename());
|
||||
if (result.is_error())
|
||||
return result;
|
||||
}
|
||||
|
||||
auto result = new_parent_inode->add_child(old_inode->identifier(), FileSystemPath(new_path).basename(), 0 /* FIXME: file type? */);
|
||||
auto result = new_parent_inode.add_child(old_inode.identifier(), FileSystemPath(new_path).basename(), 0 /* FIXME: file type? */);
|
||||
if (result.is_error())
|
||||
return result;
|
||||
|
||||
result = old_parent_inode->remove_child(FileSystemPath(old_path).basename());
|
||||
result = old_parent_inode.remove_child(FileSystemPath(old_path).basename());
|
||||
if (result.is_error())
|
||||
return result;
|
||||
|
||||
return KSuccess;
|
||||
}
|
||||
|
||||
KResult VFS::chown(StringView path, uid_t a_uid, gid_t a_gid, Inode& base)
|
||||
KResult VFS::chown(StringView path, uid_t a_uid, gid_t a_gid, Custody& base)
|
||||
{
|
||||
auto inode_or_error = resolve_path_to_inode(path, base);
|
||||
if (inode_or_error.is_error())
|
||||
return inode_or_error.error();
|
||||
auto inode = inode_or_error.value();
|
||||
auto custody_or_error = resolve_path_to_custody(path, base);
|
||||
if (custody_or_error.is_error())
|
||||
return custody_or_error.error();
|
||||
auto& custody = *custody_or_error.value();
|
||||
auto& inode = custody.inode();
|
||||
|
||||
if (inode->fs().is_readonly())
|
||||
if (inode.fs().is_readonly())
|
||||
return KResult(-EROFS);
|
||||
|
||||
if (current->process().euid() != inode->metadata().uid && !current->process().is_superuser())
|
||||
if (current->process().euid() != inode.metadata().uid && !current->process().is_superuser())
|
||||
return KResult(-EPERM);
|
||||
|
||||
uid_t new_uid = inode->metadata().uid;
|
||||
gid_t new_gid = inode->metadata().gid;
|
||||
uid_t new_uid = inode.metadata().uid;
|
||||
gid_t new_gid = inode.metadata().gid;
|
||||
|
||||
if (a_uid != (uid_t)-1) {
|
||||
if (current->process().euid() != a_uid && !current->process().is_superuser())
|
||||
|
|
@ -412,8 +426,8 @@ KResult VFS::chown(StringView path, uid_t a_uid, gid_t a_gid, Inode& base)
|
|||
new_gid = a_gid;
|
||||
}
|
||||
|
||||
dbgprintf("VFS::chown(): inode %u:%u <- uid:%d, gid:%d\n", inode->fsid(), inode->index(), new_uid, new_gid);
|
||||
return inode->chown(new_uid, new_gid);
|
||||
dbgprintf("VFS::chown(): inode %u:%u <- uid:%d, gid:%d\n", inode.fsid(), inode.index(), new_uid, new_gid);
|
||||
return inode.chown(new_uid, new_gid);
|
||||
}
|
||||
|
||||
KResultOr<Retained<Inode>> VFS::resolve_path_to_inode(StringView path, Inode& base, RetainPtr<Inode>* parent_inode, int options)
|
||||
|
|
@ -431,72 +445,78 @@ KResultOr<Retained<Inode>> VFS::resolve_path_to_inode(StringView path, Inode& ba
|
|||
return Retained<Inode>(*get_inode(result.value()));
|
||||
}
|
||||
|
||||
KResult VFS::link(StringView old_path, StringView new_path, Inode& base)
|
||||
KResult VFS::link(StringView old_path, StringView new_path, Custody& base)
|
||||
{
|
||||
auto old_inode_or_error = resolve_path_to_inode(old_path, base);
|
||||
if (old_inode_or_error.is_error())
|
||||
return old_inode_or_error.error();
|
||||
auto old_inode = old_inode_or_error.value();
|
||||
auto old_custody_or_error = resolve_path_to_custody(old_path, base);
|
||||
if (old_custody_or_error.is_error())
|
||||
return old_custody_or_error.error();
|
||||
auto& old_custody = *old_custody_or_error.value();
|
||||
auto& old_inode = old_custody.inode();
|
||||
|
||||
RetainPtr<Inode> parent_inode;
|
||||
auto new_inode_or_error = resolve_path_to_inode(new_path, base, &parent_inode);
|
||||
if (!new_inode_or_error.is_error())
|
||||
RetainPtr<Custody> parent_custody;
|
||||
auto new_custody_or_error = resolve_path_to_custody(new_path, base, &parent_custody);
|
||||
if (!new_custody_or_error.is_error())
|
||||
return KResult(-EEXIST);
|
||||
|
||||
if (!parent_inode)
|
||||
if (!parent_custody)
|
||||
return KResult(-ENOENT);
|
||||
|
||||
if (parent_inode->fsid() != old_inode->fsid())
|
||||
auto& parent_inode = parent_custody->inode();
|
||||
|
||||
if (parent_inode.fsid() != old_inode.fsid())
|
||||
return KResult(-EXDEV);
|
||||
|
||||
if (parent_inode->fs().is_readonly())
|
||||
if (parent_inode.fs().is_readonly())
|
||||
return KResult(-EROFS);
|
||||
|
||||
if (!parent_inode->metadata().may_write(current->process()))
|
||||
if (!parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
return parent_inode->add_child(old_inode->identifier(), FileSystemPath(new_path).basename(), 0);
|
||||
return parent_inode.add_child(old_inode.identifier(), FileSystemPath(new_path).basename(), 0);
|
||||
}
|
||||
|
||||
KResult VFS::unlink(StringView path, Inode& base)
|
||||
KResult VFS::unlink(StringView path, Custody& base)
|
||||
{
|
||||
RetainPtr<Inode> parent_inode;
|
||||
auto inode_or_error = resolve_path_to_inode(path, base, &parent_inode);
|
||||
if (inode_or_error.is_error())
|
||||
return inode_or_error.error();
|
||||
auto inode = inode_or_error.value();
|
||||
RetainPtr<Custody> parent_custody;
|
||||
auto custody_or_error = resolve_path_to_custody(path, base, &parent_custody);
|
||||
if (custody_or_error.is_error())
|
||||
return custody_or_error.error();
|
||||
auto& custody = *custody_or_error.value();
|
||||
auto& inode = custody.inode();
|
||||
|
||||
if (inode->is_directory())
|
||||
if (inode.is_directory())
|
||||
return KResult(-EISDIR);
|
||||
|
||||
if (!parent_inode->metadata().may_write(current->process()))
|
||||
auto& parent_inode = parent_custody->inode();
|
||||
if (!parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
if (parent_inode->metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && inode->metadata().uid != current->process().euid())
|
||||
if (parent_inode.metadata().is_sticky()) {
|
||||
if (!current->process().is_superuser() && inode.metadata().uid != current->process().euid())
|
||||
return KResult(-EACCES);
|
||||
}
|
||||
|
||||
return parent_inode->remove_child(FileSystemPath(path).basename());
|
||||
return parent_inode.remove_child(FileSystemPath(path).basename());
|
||||
}
|
||||
|
||||
KResult VFS::symlink(StringView target, StringView linkpath, Inode& base)
|
||||
KResult VFS::symlink(StringView target, StringView linkpath, Custody& base)
|
||||
{
|
||||
RetainPtr<Inode> parent_inode;
|
||||
auto existing_file_or_error = resolve_path_to_inode(linkpath, base, &parent_inode);
|
||||
if (!existing_file_or_error.is_error())
|
||||
RetainPtr<Custody> parent_custody;
|
||||
auto existing_custody_or_error = resolve_path_to_custody(linkpath, base, &parent_custody);
|
||||
if (!existing_custody_or_error.is_error())
|
||||
return KResult(-EEXIST);
|
||||
if (!parent_inode)
|
||||
if (!parent_custody)
|
||||
return KResult(-ENOENT);
|
||||
if (existing_file_or_error.error() != -ENOENT)
|
||||
return existing_file_or_error.error();
|
||||
if (!parent_inode->metadata().may_write(current->process()))
|
||||
if (existing_custody_or_error.error() != -ENOENT)
|
||||
return existing_custody_or_error.error();
|
||||
auto& parent_inode = parent_custody->inode();
|
||||
if (!parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
FileSystemPath p(linkpath);
|
||||
dbgprintf("VFS::symlink: '%s' (-> '%s') in %u:%u\n", p.basename().characters(), target.characters(), parent_inode->fsid(), parent_inode->index());
|
||||
dbgprintf("VFS::symlink: '%s' (-> '%s') in %u:%u\n", p.basename().characters(), target.characters(), parent_inode.fsid(), parent_inode.index());
|
||||
int error;
|
||||
auto new_file = parent_inode->fs().create_inode(parent_inode->identifier(), p.basename(), 0120644, 0, 0, error);
|
||||
auto new_file = parent_inode.fs().create_inode(parent_inode.identifier(), p.basename(), 0120644, 0, 0, error);
|
||||
if (!new_file)
|
||||
return KResult(error);
|
||||
ssize_t nwritten = new_file->write_bytes(0, target.length(), (const byte*)target.characters(), nullptr);
|
||||
|
|
@ -505,38 +525,41 @@ KResult VFS::symlink(StringView target, StringView linkpath, Inode& base)
|
|||
return KSuccess;
|
||||
}
|
||||
|
||||
KResult VFS::rmdir(StringView path, Inode& base)
|
||||
KResult VFS::rmdir(StringView path, Custody& base)
|
||||
{
|
||||
RetainPtr<Inode> parent_inode;
|
||||
auto inode_or_error = resolve_path_to_inode(path, base, &parent_inode);
|
||||
if (inode_or_error.is_error())
|
||||
return KResult(inode_or_error.error());
|
||||
RetainPtr<Custody> parent_custody;
|
||||
auto custody_or_error = resolve_path_to_custody(path, base, &parent_custody);
|
||||
if (custody_or_error.is_error())
|
||||
return KResult(custody_or_error.error());
|
||||
|
||||
auto inode = inode_or_error.value();
|
||||
if (inode->fs().is_readonly())
|
||||
auto& custody = *custody_or_error.value();
|
||||
auto& inode = custody.inode();
|
||||
if (inode.fs().is_readonly())
|
||||
return KResult(-EROFS);
|
||||
|
||||
// FIXME: We should return EINVAL if the last component of the path is "."
|
||||
// FIXME: We should return ENOTEMPTY if the last component of the path is ".."
|
||||
|
||||
if (!inode->is_directory())
|
||||
if (!inode.is_directory())
|
||||
return KResult(-ENOTDIR);
|
||||
|
||||
if (!parent_inode->metadata().may_write(current->process()))
|
||||
auto& parent_inode = parent_custody->inode();
|
||||
|
||||
if (!parent_inode.metadata().may_write(current->process()))
|
||||
return KResult(-EACCES);
|
||||
|
||||
if (inode->directory_entry_count() != 2)
|
||||
if (inode.directory_entry_count() != 2)
|
||||
return KResult(-ENOTEMPTY);
|
||||
|
||||
auto result = inode->remove_child(".");
|
||||
auto result = inode.remove_child(".");
|
||||
if (result.is_error())
|
||||
return result;
|
||||
|
||||
result = inode->remove_child("..");
|
||||
result = inode.remove_child("..");
|
||||
if (result.is_error())
|
||||
return result;
|
||||
|
||||
return parent_inode->remove_child(FileSystemPath(path).basename());
|
||||
return parent_inode.remove_child(FileSystemPath(path).basename());
|
||||
}
|
||||
|
||||
KResultOr<InodeIdentifier> VFS::resolve_symbolic_link(InodeIdentifier base, Inode& symlink_inode)
|
||||
|
|
@ -748,7 +771,7 @@ Custody& VFS::root_custody()
|
|||
return *m_root_custody;
|
||||
}
|
||||
|
||||
KResultOr<Retained<Custody>> VFS::resolve_path_to_custody(StringView path, Custody& base, int options)
|
||||
KResultOr<Retained<Custody>> VFS::resolve_path_to_custody(StringView path, Custody& base, RetainPtr<Custody>* parent_custody, int options)
|
||||
{
|
||||
if (path.is_empty())
|
||||
return KResult(-EINVAL);
|
||||
|
|
@ -759,7 +782,7 @@ KResultOr<Retained<Custody>> VFS::resolve_path_to_custody(StringView path, Custo
|
|||
Vector<Retained<Custody>, 32> custody_chain;
|
||||
|
||||
if (path[0] == '/') {
|
||||
custody_chain.append(Retained<Custody>(base));
|
||||
custody_chain.append(root_custody());
|
||||
crumb_id = root_inode_id();
|
||||
} else {
|
||||
for (auto* custody = &base; custody; custody = custody->parent()) {
|
||||
|
|
@ -769,6 +792,9 @@ KResultOr<Retained<Custody>> VFS::resolve_path_to_custody(StringView path, Custo
|
|||
crumb_id = base.inode().identifier();
|
||||
}
|
||||
|
||||
if (parent_custody)
|
||||
*parent_custody = custody_chain.last();
|
||||
|
||||
for (int i = 0; i < parts.size(); ++i) {
|
||||
bool inode_was_root_at_head_of_loop = crumb_id.is_root_inode();
|
||||
auto& part = parts[i];
|
||||
|
|
@ -798,6 +824,12 @@ KResultOr<Retained<Custody>> VFS::resolve_path_to_custody(StringView path, Custo
|
|||
ASSERT(crumb_inode);
|
||||
custody_chain.append(Custody::create(custody_chain.last().ptr(), part, *crumb_inode));
|
||||
metadata = crumb_inode->metadata();
|
||||
if (metadata.is_directory()) {
|
||||
if (i != parts.size() - 1) {
|
||||
if (parent_custody)
|
||||
*parent_custody = custody_chain.last();
|
||||
}
|
||||
}
|
||||
if (metadata.is_symlink()) {
|
||||
if (i == parts.size() - 1) {
|
||||
if (options & O_NOFOLLOW)
|
||||
|
|
|
|||
|
|
@ -63,22 +63,22 @@ public:
|
|||
bool mount(RetainPtr<FS>&&, StringView path);
|
||||
|
||||
KResultOr<Retained<FileDescriptor>> open(RetainPtr<Device>&&, int options);
|
||||
KResultOr<Retained<FileDescriptor>> open(StringView path, int options, mode_t mode, Inode& base);
|
||||
KResultOr<Retained<FileDescriptor>> create(StringView path, int options, mode_t mode, Inode& base);
|
||||
KResult mkdir(StringView path, mode_t mode, Inode& base);
|
||||
KResult link(StringView old_path, StringView new_path, Inode& base);
|
||||
KResult unlink(StringView path, Inode& base);
|
||||
KResult symlink(StringView target, StringView linkpath, Inode& base);
|
||||
KResult rmdir(StringView path, Inode& base);
|
||||
KResult chmod(StringView path, mode_t, Inode& base);
|
||||
KResult chmod(Inode&, mode_t);
|
||||
KResult chown(StringView path, uid_t, gid_t, Inode& base);
|
||||
KResult access(StringView path, int mode, Inode& base);
|
||||
KResult stat(StringView path, int options, Inode& base, struct stat&);
|
||||
KResult utime(StringView path, Inode& base, time_t atime, time_t mtime);
|
||||
KResult rename(StringView oldpath, StringView newpath, Inode& base);
|
||||
KResult mknod(StringView path, mode_t, dev_t, Inode& base);
|
||||
KResultOr<Retained<Inode>> open_directory(StringView path, Inode& base);
|
||||
KResultOr<Retained<FileDescriptor>> open(StringView path, int options, mode_t mode, Custody& base);
|
||||
KResultOr<Retained<FileDescriptor>> create(StringView path, int options, mode_t mode, Custody& base);
|
||||
KResult mkdir(StringView path, mode_t mode, Custody& base);
|
||||
KResult link(StringView old_path, StringView new_path, Custody& base);
|
||||
KResult unlink(StringView path, Custody& base);
|
||||
KResult symlink(StringView target, StringView linkpath, Custody& base);
|
||||
KResult rmdir(StringView path, Custody& base);
|
||||
KResult chmod(StringView path, mode_t, Custody& base);
|
||||
KResult fchmod(Inode&, mode_t);
|
||||
KResult chown(StringView path, uid_t, gid_t, Custody& base);
|
||||
KResult access(StringView path, int mode, Custody& base);
|
||||
KResult stat(StringView path, int options, Custody& base, struct stat&);
|
||||
KResult utime(StringView path, Custody& base, time_t atime, time_t mtime);
|
||||
KResult rename(StringView oldpath, StringView newpath, Custody& base);
|
||||
KResult mknod(StringView path, mode_t, dev_t, Custody& base);
|
||||
KResultOr<Retained<Custody>> open_directory(StringView path, Custody& base);
|
||||
|
||||
void register_device(Device&);
|
||||
void unregister_device(Device&);
|
||||
|
|
@ -98,7 +98,7 @@ public:
|
|||
Device* get_device(unsigned major, unsigned minor);
|
||||
|
||||
Custody& root_custody();
|
||||
KResultOr<Retained<Custody>> resolve_path_to_custody(StringView path, Custody& base, int options = 0);
|
||||
KResultOr<Retained<Custody>> resolve_path_to_custody(StringView path, Custody& base, RetainPtr<Custody>* parent = nullptr, int options = 0);
|
||||
|
||||
private:
|
||||
friend class FileDescriptor;
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue