2020-07-30 23:01:41 +00:00
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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2021-04-22 08:24:48 +00:00
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* SPDX-License-Identifier: BSD-2-Clause
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2020-07-30 23:01:41 +00:00
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*/
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2020-07-30 21:38:15 +00:00
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#include <Kernel/FileSystem/Custody.h>
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2020-12-25 17:26:38 +00:00
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#include <Kernel/FileSystem/DevFS.h>
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2020-07-30 21:38:15 +00:00
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#include <Kernel/FileSystem/DevPtsFS.h>
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#include <Kernel/FileSystem/Ext2FileSystem.h>
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#include <Kernel/FileSystem/Plan9FileSystem.h>
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#include <Kernel/FileSystem/ProcFS.h>
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2021-03-13 10:01:44 +00:00
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#include <Kernel/FileSystem/SysFS.h>
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2020-07-30 21:38:15 +00:00
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#include <Kernel/FileSystem/TmpFS.h>
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#include <Kernel/FileSystem/VirtualFileSystem.h>
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#include <Kernel/Process.h>
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namespace Kernel {
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2021-06-28 18:59:35 +00:00
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KResultOr<FlatPtr> Process::sys$mount(Userspace<const Syscall::SC_mount_params*> user_params)
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2020-07-30 21:38:15 +00:00
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{
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if (!is_superuser())
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2021-03-01 12:49:16 +00:00
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return EPERM;
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2020-07-30 21:38:15 +00:00
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REQUIRE_NO_PROMISES;
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Syscall::SC_mount_params params;
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2020-09-12 03:11:07 +00:00
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if (!copy_from_user(¶ms, user_params))
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2021-03-01 12:49:16 +00:00
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return EFAULT;
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2020-07-30 21:38:15 +00:00
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auto source_fd = params.source_fd;
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2020-09-12 03:11:07 +00:00
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auto target = copy_string_from_user(params.target);
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2020-07-30 21:38:15 +00:00
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if (target.is_null())
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2021-03-01 12:49:16 +00:00
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return EFAULT;
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2020-09-12 03:11:07 +00:00
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auto fs_type = copy_string_from_user(params.fs_type);
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if (fs_type.is_null())
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2021-03-01 12:49:16 +00:00
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return EFAULT;
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2020-07-30 21:38:15 +00:00
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auto description = file_description(source_fd);
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if (!description.is_null())
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2021-01-10 14:43:09 +00:00
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dbgln("mount {}: source fd {} @ {}", fs_type, source_fd, target);
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2020-07-30 21:38:15 +00:00
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else
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2021-01-10 14:43:09 +00:00
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dbgln("mount {} @ {}", fs_type, target);
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2020-07-30 21:38:15 +00:00
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auto custody_or_error = VFS::the().resolve_path(target, current_directory());
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& target_custody = custody_or_error.value();
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if (params.flags & MS_REMOUNT) {
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// We're not creating a new mount, we're updating an existing one!
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return VFS::the().remount(target_custody, params.flags & ~MS_REMOUNT);
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}
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if (params.flags & MS_BIND) {
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// We're doing a bind mount.
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if (description.is_null())
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2021-03-01 12:49:16 +00:00
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return EBADF;
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2020-07-30 21:38:15 +00:00
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if (!description->custody()) {
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// We only support bind-mounting inodes, not arbitrary files.
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2021-03-01 12:49:16 +00:00
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return ENODEV;
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2020-07-30 21:38:15 +00:00
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}
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return VFS::the().bind_mount(*description->custody(), target_custody, params.flags);
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}
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RefPtr<FS> fs;
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if (fs_type == "ext2" || fs_type == "Ext2FS") {
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if (description.is_null())
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2021-03-01 12:49:16 +00:00
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return EBADF;
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2021-01-28 22:54:29 +00:00
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if (!description->file().is_block_device())
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2021-03-01 12:49:16 +00:00
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return ENOTBLK;
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2020-07-30 21:38:15 +00:00
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if (!description->file().is_seekable()) {
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2021-01-09 17:51:44 +00:00
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dbgln("mount: this is not a seekable file");
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2021-03-01 12:49:16 +00:00
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return ENODEV;
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2020-07-30 21:38:15 +00:00
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}
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2021-01-10 14:43:09 +00:00
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dbgln("mount: attempting to mount {} on {}", description->absolute_path(), target);
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2020-07-30 21:38:15 +00:00
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fs = Ext2FS::create(*description);
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} else if (fs_type == "9p" || fs_type == "Plan9FS") {
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if (description.is_null())
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2021-03-01 12:49:16 +00:00
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return EBADF;
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2020-07-30 21:38:15 +00:00
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fs = Plan9FS::create(*description);
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} else if (fs_type == "proc" || fs_type == "ProcFS") {
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fs = ProcFS::create();
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} else if (fs_type == "devpts" || fs_type == "DevPtsFS") {
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fs = DevPtsFS::create();
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2020-12-25 17:26:38 +00:00
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} else if (fs_type == "dev" || fs_type == "DevFS") {
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fs = DevFS::create();
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2021-03-13 10:01:44 +00:00
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} else if (fs_type == "sys" || fs_type == "SysFS") {
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fs = SysFS::create();
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2020-07-30 21:38:15 +00:00
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} else if (fs_type == "tmp" || fs_type == "TmpFS") {
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fs = TmpFS::create();
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} else {
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2021-03-01 12:49:16 +00:00
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return ENODEV;
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2020-07-30 21:38:15 +00:00
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}
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2021-05-28 12:42:03 +00:00
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if (!fs)
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return ENOMEM;
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2020-07-30 21:38:15 +00:00
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if (!fs->initialize()) {
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2021-01-10 14:43:09 +00:00
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dbgln("mount: failed to initialize {} filesystem, fd={}", fs_type, source_fd);
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2021-03-01 12:49:16 +00:00
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return ENODEV;
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2020-07-30 21:38:15 +00:00
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}
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auto result = VFS::the().mount(fs.release_nonnull(), target_custody, params.flags);
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if (!description.is_null())
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2021-01-10 14:43:09 +00:00
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dbgln("mount: successfully mounted {} on {}", description->absolute_path(), target);
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2020-07-30 21:38:15 +00:00
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else
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2021-01-10 14:43:09 +00:00
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dbgln("mount: successfully mounted {}", target);
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2020-07-30 21:38:15 +00:00
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return result;
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}
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2021-06-28 18:59:35 +00:00
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KResultOr<FlatPtr> Process::sys$umount(Userspace<const char*> user_mountpoint, size_t mountpoint_length)
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2020-07-30 21:38:15 +00:00
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{
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if (!is_superuser())
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2021-03-01 12:49:16 +00:00
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return EPERM;
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2020-07-30 21:38:15 +00:00
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REQUIRE_NO_PROMISES;
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auto mountpoint = get_syscall_path_argument(user_mountpoint, mountpoint_length);
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if (mountpoint.is_error())
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return mountpoint.error();
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2021-05-29 14:59:40 +00:00
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auto custody_or_error = VFS::the().resolve_path(mountpoint.value()->view(), current_directory());
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2020-07-30 21:38:15 +00:00
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if (custody_or_error.is_error())
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return custody_or_error.error();
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auto& guest_inode = custody_or_error.value()->inode();
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return VFS::the().unmount(guest_inode);
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}
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}
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