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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <Kernel/FileSystem/Custody.h>
#include <Kernel/FileSystem/DevFS.h>
#include <Kernel/FileSystem/DevPtsFS.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/Plan9FileSystem.h>
#include <Kernel/FileSystem/ProcFS.h>
#include <Kernel/FileSystem/SysFS.h>
#include <Kernel/FileSystem/TmpFS.h>
#include <Kernel/FileSystem/VirtualFileSystem.h>
#include <Kernel/Process.h>
namespace Kernel {
KResultOr<FlatPtr> Process::sys$mount(Userspace<const Syscall::SC_mount_params*> user_params)
{
if (!is_superuser())
return EPERM;
REQUIRE_NO_PROMISES;
Syscall::SC_mount_params params;
if (!copy_from_user(¶ms, user_params))
return EFAULT;
auto source_fd = params.source_fd;
auto target = copy_string_from_user(params.target);
if (target.is_null())
return EFAULT;
auto fs_type = copy_string_from_user(params.fs_type);
if (fs_type.is_null())
return EFAULT;
auto description = fds().file_description(source_fd);
if (!description.is_null())
dbgln("mount {}: source fd {} @ {}", fs_type, source_fd, target);
else
dbgln("mount {} @ {}", fs_type, target);
auto custody_or_error = VirtualFileSystem::the().resolve_path(target, current_directory());
if (custody_or_error.is_error())
return custody_or_error.error();
auto& target_custody = custody_or_error.value();
if (params.flags & MS_REMOUNT) {
// We're not creating a new mount, we're updating an existing one!
return VirtualFileSystem::the().remount(target_custody, params.flags & ~MS_REMOUNT);
}
if (params.flags & MS_BIND) {
// We're doing a bind mount.
if (description.is_null())
return EBADF;
if (!description->custody()) {
// We only support bind-mounting inodes, not arbitrary files.
return ENODEV;
}
return VirtualFileSystem::the().bind_mount(*description->custody(), target_custody, params.flags);
}
RefPtr<FileSystem> fs;
if (fs_type == "ext2" || fs_type == "Ext2FS") {
if (description.is_null())
return EBADF;
if (!description->file().is_block_device())
return ENOTBLK;
if (!description->file().is_seekable()) {
dbgln("mount: this is not a seekable file");
return ENODEV;
}
dbgln("mount: attempting to mount {} on {}", description->absolute_path(), target);
fs = Ext2FS::create(*description);
} else if (fs_type == "9p" || fs_type == "Plan9FS") {
if (description.is_null())
return EBADF;
fs = Plan9FS::create(*description);
} else if (fs_type == "proc" || fs_type == "ProcFS") {
fs = ProcFS::create();
} else if (fs_type == "devpts" || fs_type == "DevPtsFS") {
fs = DevPtsFS::create();
} else if (fs_type == "dev" || fs_type == "DevFS") {
fs = DevFS::create();
} else if (fs_type == "sys" || fs_type == "SysFS") {
fs = SysFS::create();
} else if (fs_type == "tmp" || fs_type == "TmpFS") {
fs = TmpFS::create();
} else {
return ENODEV;
}
if (!fs)
return ENOMEM;
if (!fs->initialize()) {
dbgln("mount: failed to initialize {} filesystem, fd={}", fs_type, source_fd);
return ENODEV;
}
auto result = VirtualFileSystem::the().mount(fs.release_nonnull(), target_custody, params.flags);
if (!description.is_null())
dbgln("mount: successfully mounted {} on {}", description->absolute_path(), target);
else
dbgln("mount: successfully mounted {}", target);
return result;
}
KResultOr<FlatPtr> Process::sys$umount(Userspace<const char*> user_mountpoint, size_t mountpoint_length)
{
if (!is_superuser())
return EPERM;
REQUIRE_NO_PROMISES;
auto mountpoint = get_syscall_path_argument(user_mountpoint, mountpoint_length);
if (mountpoint.is_error())
return mountpoint.error();
auto custody_or_error = VirtualFileSystem::the().resolve_path(mountpoint.value()->view(), current_directory());
if (custody_or_error.is_error())
return custody_or_error.error();
auto& guest_inode = custody_or_error.value()->inode();
return VirtualFileSystem::the().unmount(guest_inode);
}
}
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