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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/DevPtsFS.h>
#include <Kernel/FileSystem/DevTmpFS.h>
#include <Kernel/FileSystem/Ext2FileSystem.h>
#include <Kernel/FileSystem/ISO9660FileSystem.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 {
ErrorOr<FlatPtr> Process::sys$mount(Userspace<const Syscall::SC_mount_params*> user_params)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
TRY(require_no_promises());
if (!is_superuser())
return EPERM;
auto params = TRY(copy_typed_from_user(user_params));
auto source_fd = params.source_fd;
auto target = TRY(try_copy_kstring_from_user(params.target));
auto fs_type_string = TRY(try_copy_kstring_from_user(params.fs_type));
auto fs_type = fs_type_string->view();
auto description_or_error = fds().open_file_description(source_fd);
if (!description_or_error.is_error())
dbgln("mount {}: source fd {} @ {}", fs_type, source_fd, target);
else
dbgln("mount {} @ {}", fs_type, target);
auto target_custody = TRY(VirtualFileSystem::the().resolve_path(target->view(), current_directory()));
if (params.flags & MS_REMOUNT) {
// We're not creating a new mount, we're updating an existing one!
TRY(VirtualFileSystem::the().remount(target_custody, params.flags & ~MS_REMOUNT));
return 0;
}
if (params.flags & MS_BIND) {
// We're doing a bind mount.
if (description_or_error.is_error())
return description_or_error.release_error();
auto description = description_or_error.release_value();
if (!description->custody()) {
// We only support bind-mounting inodes, not arbitrary files.
return ENODEV;
}
TRY(VirtualFileSystem::the().bind_mount(*description->custody(), target_custody, params.flags));
return 0;
}
RefPtr<FileSystem> fs;
if (fs_type == "ext2"sv || fs_type == "Ext2FS"sv) {
if (description_or_error.is_error())
return EBADF;
auto description = description_or_error.release_value();
if (!description->file().is_block_device())
return ENOTBLK;
if (!description->file().is_seekable()) {
dbgln("mount: this is not a seekable file");
return ENODEV;
}
auto source_pseudo_path = TRY(description->pseudo_path());
dbgln("mount: attempting to mount {} on {}", source_pseudo_path, target);
fs = TRY(Ext2FS::try_create(*description));
} else if (fs_type == "9p"sv || fs_type == "Plan9FS"sv) {
if (description_or_error.is_error())
return EBADF;
auto description = description_or_error.release_value();
fs = TRY(Plan9FS::try_create(*description));
} else if (fs_type == "proc"sv || fs_type == "ProcFS"sv) {
fs = TRY(ProcFS::try_create());
} else if (fs_type == "devpts"sv || fs_type == "DevPtsFS"sv) {
fs = TRY(DevPtsFS::try_create());
} else if (fs_type == "dev"sv || fs_type == "DevTmpFS"sv) {
fs = TRY(DevTmpFS::try_create());
} else if (fs_type == "sys"sv || fs_type == "SysFS"sv) {
fs = TRY(SysFS::try_create());
} else if (fs_type == "tmp"sv || fs_type == "TmpFS"sv) {
fs = TRY(TmpFS::try_create());
} else if (fs_type == "iso9660"sv || fs_type == "ISO9660FS"sv) {
if (description_or_error.is_error())
return EBADF;
auto description = description_or_error.release_value();
if (!description->file().is_seekable()) {
dbgln("mount: this is not a seekable file");
return ENODEV;
}
auto source_pseudo_path = TRY(description->pseudo_path());
dbgln("mount: attempting to mount {} on {}", source_pseudo_path, target);
fs = TRY(ISO9660FS::try_create(*description));
} else {
return ENODEV;
}
if (!fs)
return ENOMEM;
TRY(fs->initialize());
TRY(VirtualFileSystem::the().mount(fs.release_nonnull(), target_custody, params.flags));
return 0;
}
ErrorOr<FlatPtr> Process::sys$umount(Userspace<const char*> user_mountpoint, size_t mountpoint_length)
{
VERIFY_PROCESS_BIG_LOCK_ACQUIRED(this)
if (!is_superuser())
return EPERM;
TRY(require_no_promises());
auto mountpoint = TRY(get_syscall_path_argument(user_mountpoint, mountpoint_length));
auto custody = TRY(VirtualFileSystem::the().resolve_path(mountpoint->view(), current_directory()));
auto& guest_inode = custody->inode();
TRY(VirtualFileSystem::the().unmount(guest_inode));
return 0;
}
}
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