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https://github.com/reactos/reactos.git
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624 lines
20 KiB
C
624 lines
20 KiB
C
/* Copyright (c) Mark Harmstone 2019
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*
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* This file is part of WinBtrfs.
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*
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* WinBtrfs is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public Licence as published by
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* the Free Software Foundation, either version 3 of the Licence, or
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* (at your option) any later version.
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*
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* WinBtrfs is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public Licence for more details.
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*
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* You should have received a copy of the GNU Lesser General Public Licence
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* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
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#include "btrfs_drv.h"
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#ifndef __REACTOS__
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#ifdef _MSC_VER
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#include <ntstrsafe.h>
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#endif
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#else
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#include <ntstrsafe.h>
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#endif
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extern ERESOURCE pdo_list_lock;
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extern LIST_ENTRY pdo_list;
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extern ERESOURCE boot_lock;
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extern PDRIVER_OBJECT drvobj;
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BTRFS_UUID boot_uuid; // initialized to 0
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uint64_t boot_subvol = 0;
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#ifndef _MSC_VER
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NTSTATUS RtlUnicodeStringPrintf(PUNICODE_STRING DestinationString, const WCHAR* pszFormat, ...); // not in mingw
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#endif
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// Not in any headers? Windbg knows about it though.
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#define DOE_START_PENDING 0x10
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// Just as much as we need - the version in mingw is truncated still further
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typedef struct {
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CSHORT Type;
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USHORT Size;
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PDEVICE_OBJECT DeviceObject;
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ULONG PowerFlags;
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void* Dope;
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ULONG ExtensionFlags;
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} DEVOBJ_EXTENSION2;
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typedef enum {
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system_root_unknown,
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system_root_partition,
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system_root_btrfs
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} system_root_type;
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typedef struct {
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uint32_t disk_num;
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uint32_t partition_num;
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BTRFS_UUID uuid;
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system_root_type type;
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} system_root;
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static void get_system_root(system_root* sr) {
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NTSTATUS Status;
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HANDLE h;
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UNICODE_STRING us, target;
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OBJECT_ATTRIBUTES objatt;
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ULONG retlen = 0;
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bool second_time = false;
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static const WCHAR system_root[] = L"\\SystemRoot";
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static const WCHAR boot_device[] = L"\\Device\\BootDevice";
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static const WCHAR arc_prefix[] = L"\\ArcName\\multi(0)disk(0)rdisk(";
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static const WCHAR arc_middle[] = L")partition(";
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static const WCHAR arc_btrfs_prefix[] = L"\\ArcName\\btrfs(";
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us.Buffer = (WCHAR*)system_root;
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us.Length = us.MaximumLength = sizeof(system_root) - sizeof(WCHAR);
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InitializeObjectAttributes(&objatt, &us, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
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while (true) {
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Status = ZwOpenSymbolicLinkObject(&h, GENERIC_READ, &objatt);
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if (!NT_SUCCESS(Status)) {
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ERR("ZwOpenSymbolicLinkObject returned %08lx\n", Status);
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return;
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}
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target.Length = target.MaximumLength = 0;
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Status = ZwQuerySymbolicLinkObject(h, &target, &retlen);
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if (Status != STATUS_BUFFER_TOO_SMALL) {
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ERR("ZwQuerySymbolicLinkObject returned %08lx\n", Status);
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NtClose(h);
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return;
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}
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if (retlen == 0) {
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NtClose(h);
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return;
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}
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target.Buffer = ExAllocatePoolWithTag(NonPagedPool, retlen, ALLOC_TAG);
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if (!target.Buffer) {
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ERR("out of memory\n");
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NtClose(h);
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return;
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}
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target.Length = target.MaximumLength = (USHORT)retlen;
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Status = ZwQuerySymbolicLinkObject(h, &target, NULL);
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if (!NT_SUCCESS(Status)) {
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ERR("ZwQuerySymbolicLinkObject returned %08lx\n", Status);
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NtClose(h);
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ExFreePool(target.Buffer);
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return;
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}
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NtClose(h);
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if (second_time) {
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TRACE("boot device is %.*S\n", (int)(target.Length / sizeof(WCHAR)), target.Buffer);
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} else {
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TRACE("system root is %.*S\n", (int)(target.Length / sizeof(WCHAR)), target.Buffer);
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}
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if (!second_time && target.Length >= sizeof(boot_device) - sizeof(WCHAR) &&
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RtlCompareMemory(target.Buffer, boot_device, sizeof(boot_device) - sizeof(WCHAR)) == sizeof(boot_device) - sizeof(WCHAR)) {
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ExFreePool(target.Buffer);
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us.Buffer = (WCHAR*)boot_device;
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us.Length = us.MaximumLength = sizeof(boot_device) - sizeof(WCHAR);
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second_time = true;
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} else
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break;
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}
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sr->type = system_root_unknown;
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if (target.Length >= sizeof(arc_prefix) - sizeof(WCHAR) &&
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RtlCompareMemory(target.Buffer, arc_prefix, sizeof(arc_prefix) - sizeof(WCHAR)) == sizeof(arc_prefix) - sizeof(WCHAR)) {
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WCHAR* s = &target.Buffer[(sizeof(arc_prefix) / sizeof(WCHAR)) - 1];
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ULONG left = ((target.Length - sizeof(arc_prefix)) / sizeof(WCHAR)) + 1;
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if (left == 0 || s[0] < '0' || s[0] > '9') {
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ExFreePool(target.Buffer);
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return;
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}
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sr->disk_num = 0;
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while (left > 0 && s[0] >= '0' && s[0] <= '9') {
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sr->disk_num *= 10;
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sr->disk_num += s[0] - '0';
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s++;
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left--;
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}
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if (left <= (sizeof(arc_middle) / sizeof(WCHAR)) - 1 ||
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RtlCompareMemory(s, arc_middle, sizeof(arc_middle) - sizeof(WCHAR)) != sizeof(arc_middle) - sizeof(WCHAR)) {
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ExFreePool(target.Buffer);
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return;
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}
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s = &s[(sizeof(arc_middle) / sizeof(WCHAR)) - 1];
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left -= (sizeof(arc_middle) / sizeof(WCHAR)) - 1;
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if (left == 0 || s[0] < '0' || s[0] > '9') {
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ExFreePool(target.Buffer);
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return;
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}
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sr->partition_num = 0;
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while (left > 0 && s[0] >= '0' && s[0] <= '9') {
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sr->partition_num *= 10;
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sr->partition_num += s[0] - '0';
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s++;
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left--;
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}
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sr->type = system_root_partition;
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} else if (target.Length >= sizeof(arc_btrfs_prefix) - sizeof(WCHAR) &&
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RtlCompareMemory(target.Buffer, arc_btrfs_prefix, sizeof(arc_btrfs_prefix) - sizeof(WCHAR)) == sizeof(arc_btrfs_prefix) - sizeof(WCHAR)) {
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WCHAR* s = &target.Buffer[(sizeof(arc_btrfs_prefix) / sizeof(WCHAR)) - 1];
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#ifdef __REACTOS__
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unsigned int i;
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#endif // __REACTOS__
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#ifndef __REACTOS__
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for (unsigned int i = 0; i < 16; i++) {
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#else
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for (i = 0; i < 16; i++) {
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#endif // __REACTOS__
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if (*s >= '0' && *s <= '9')
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sr->uuid.uuid[i] = (*s - '0') << 4;
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else if (*s >= 'a' && *s <= 'f')
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sr->uuid.uuid[i] = (*s - 'a' + 0xa) << 4;
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else if (*s >= 'A' && *s <= 'F')
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sr->uuid.uuid[i] = (*s - 'A' + 0xa) << 4;
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else {
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ExFreePool(target.Buffer);
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return;
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}
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s++;
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if (*s >= '0' && *s <= '9')
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sr->uuid.uuid[i] |= *s - '0';
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else if (*s >= 'a' && *s <= 'f')
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sr->uuid.uuid[i] |= *s - 'a' + 0xa;
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else if (*s >= 'A' && *s <= 'F')
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sr->uuid.uuid[i] |= *s - 'A' + 0xa;
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else {
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ExFreePool(target.Buffer);
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return;
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}
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s++;
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if (i == 3 || i == 5 || i == 7 || i == 9) {
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if (*s != '-') {
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ExFreePool(target.Buffer);
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return;
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}
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s++;
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}
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}
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if (*s != ')') {
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ExFreePool(target.Buffer);
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return;
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}
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sr->type = system_root_btrfs;
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}
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ExFreePool(target.Buffer);
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}
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static void change_symlink(uint32_t disk_num, uint32_t partition_num, BTRFS_UUID* uuid) {
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NTSTATUS Status;
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UNICODE_STRING us, us2;
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WCHAR symlink[60], target[(sizeof(BTRFS_VOLUME_PREFIX) / sizeof(WCHAR)) + 36], *w;
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#ifdef __REACTOS__
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unsigned int i;
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#endif
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us.Buffer = symlink;
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us.Length = 0;
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us.MaximumLength = sizeof(symlink);
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Status = RtlUnicodeStringPrintf(&us, L"\\Device\\Harddisk%u\\Partition%u", disk_num, partition_num);
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if (!NT_SUCCESS(Status)) {
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ERR("RtlUnicodeStringPrintf returned %08lx\n", Status);
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return;
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}
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Status = IoDeleteSymbolicLink(&us);
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if (!NT_SUCCESS(Status))
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ERR("IoDeleteSymbolicLink returned %08lx\n", Status);
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RtlCopyMemory(target, BTRFS_VOLUME_PREFIX, sizeof(BTRFS_VOLUME_PREFIX) - sizeof(WCHAR));
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w = &target[(sizeof(BTRFS_VOLUME_PREFIX) / sizeof(WCHAR)) - 1];
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#ifndef __REACTOS__
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for (unsigned int i = 0; i < 16; i++) {
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#else
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for (i = 0; i < 16; i++) {
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#endif
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*w = hex_digit(uuid->uuid[i] >> 4); w++;
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*w = hex_digit(uuid->uuid[i] & 0xf); w++;
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if (i == 3 || i == 5 || i == 7 || i == 9) {
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*w = L'-';
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w++;
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}
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}
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*w = L'}';
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us2.Buffer = target;
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us2.Length = us2.MaximumLength = sizeof(target);
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Status = IoCreateSymbolicLink(&us, &us2);
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if (!NT_SUCCESS(Status))
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ERR("IoCreateSymbolicLink returned %08lx\n", Status);
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}
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static void mountmgr_notification(BTRFS_UUID* uuid) {
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UNICODE_STRING mmdevpath;
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NTSTATUS Status;
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PFILE_OBJECT FileObject;
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PDEVICE_OBJECT mountmgr;
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ULONG mmtnlen;
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MOUNTMGR_TARGET_NAME* mmtn;
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WCHAR* w;
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#ifdef __REACTOS__
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unsigned int i;
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#endif
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RtlInitUnicodeString(&mmdevpath, MOUNTMGR_DEVICE_NAME);
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Status = IoGetDeviceObjectPointer(&mmdevpath, FILE_READ_ATTRIBUTES, &FileObject, &mountmgr);
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if (!NT_SUCCESS(Status)) {
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ERR("IoGetDeviceObjectPointer returned %08lx\n", Status);
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return;
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}
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mmtnlen = offsetof(MOUNTMGR_TARGET_NAME, DeviceName[0]) + sizeof(BTRFS_VOLUME_PREFIX) + (36 * sizeof(WCHAR));
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mmtn = ExAllocatePoolWithTag(NonPagedPool, mmtnlen, ALLOC_TAG);
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if (!mmtn) {
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ERR("out of memory\n");
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return;
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}
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mmtn->DeviceNameLength = sizeof(BTRFS_VOLUME_PREFIX) + (36 * sizeof(WCHAR));
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RtlCopyMemory(mmtn->DeviceName, BTRFS_VOLUME_PREFIX, sizeof(BTRFS_VOLUME_PREFIX) - sizeof(WCHAR));
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w = &mmtn->DeviceName[(sizeof(BTRFS_VOLUME_PREFIX) / sizeof(WCHAR)) - 1];
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#ifndef __REACTOS__
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for (unsigned int i = 0; i < 16; i++) {
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#else
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for (i = 0; i < 16; i++) {
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#endif
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*w = hex_digit(uuid->uuid[i] >> 4); w++;
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*w = hex_digit(uuid->uuid[i] & 0xf); w++;
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if (i == 3 || i == 5 || i == 7 || i == 9) {
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*w = L'-';
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w++;
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}
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}
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*w = L'}';
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Status = dev_ioctl(mountmgr, IOCTL_MOUNTMGR_VOLUME_ARRIVAL_NOTIFICATION, mmtn, mmtnlen, NULL, 0, false, NULL);
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if (!NT_SUCCESS(Status)) {
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ERR("IOCTL_MOUNTMGR_VOLUME_ARRIVAL_NOTIFICATION returned %08lx\n", Status);
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ExFreePool(mmtn);
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return;
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}
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ExFreePool(mmtn);
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}
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static void check_boot_options() {
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NTSTATUS Status;
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WCHAR* s;
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static const WCHAR pathw[] = L"\\Registry\\Machine\\SYSTEM\\CurrentControlSet\\Control";
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static const WCHAR namew[] = L"SystemStartOptions";
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static const WCHAR subvol[] = L"SUBVOL=";
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_SEH2_TRY {
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HANDLE control;
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OBJECT_ATTRIBUTES oa;
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UNICODE_STRING path;
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ULONG kvfilen = sizeof(KEY_VALUE_FULL_INFORMATION) - sizeof(WCHAR) + (255 * sizeof(WCHAR));
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KEY_VALUE_FULL_INFORMATION* kvfi;
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UNICODE_STRING name;
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WCHAR* options;
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path.Buffer = (WCHAR*)pathw;
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path.Length = path.MaximumLength = sizeof(pathw) - sizeof(WCHAR);
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InitializeObjectAttributes(&oa, &path, OBJ_CASE_INSENSITIVE | OBJ_KERNEL_HANDLE, NULL, NULL);
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Status = ZwOpenKey(&control, KEY_QUERY_VALUE, &oa);
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if (!NT_SUCCESS(Status)) {
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ERR("ZwOpenKey returned %08lx\n", Status);
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return;
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}
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// FIXME - don't fail if value too long (can we query for the length?)
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kvfi = ExAllocatePoolWithTag(PagedPool, kvfilen, ALLOC_TAG);
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if (!kvfi) {
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ERR("out of memory\n");
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NtClose(control);
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return;
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}
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name.Buffer = (WCHAR*)namew;
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name.Length = name.MaximumLength = sizeof(namew) - sizeof(WCHAR);
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Status = ZwQueryValueKey(control, &name, KeyValueFullInformation, kvfi,
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kvfilen, &kvfilen);
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if (!NT_SUCCESS(Status)) {
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ERR("ZwQueryValueKey returned %08lx\n", Status);
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NtClose(control);
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return;
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}
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NtClose(control);
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options = (WCHAR*)((uint8_t*)kvfi + kvfi->DataOffset);
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options[kvfi->DataLength / sizeof(WCHAR)] = 0; // FIXME - make sure buffer long enough to allow this
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s = wcsstr(options, subvol);
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if (!s)
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return;
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s += (sizeof(subvol) / sizeof(WCHAR)) - 1;
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boot_subvol = 0;
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while (true) {
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if (*s >= '0' && *s <= '9') {
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boot_subvol <<= 4;
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boot_subvol |= *s - '0';
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} else if (*s >= 'a' && *s <= 'f') {
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boot_subvol <<= 4;
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boot_subvol |= *s - 'a' + 0xa;
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} else if (*s >= 'A' && *s <= 'F') {
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boot_subvol <<= 4;
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boot_subvol |= *s - 'A' + 0xa;
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} else
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break;
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s++;
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}
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} _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
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return;
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} _SEH2_END;
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if (boot_subvol != 0) {
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TRACE("passed subvol %I64x in boot options\n", boot_subvol);
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}
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}
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void boot_add_device(DEVICE_OBJECT* pdo) {
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pdo_device_extension* pdode = pdo->DeviceExtension;
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AddDevice(drvobj, pdo);
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// To stop Windows sneakily setting DOE_START_PENDING
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pdode->dont_report = true;
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if (pdo->DeviceObjectExtension) {
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((DEVOBJ_EXTENSION2*)pdo->DeviceObjectExtension)->ExtensionFlags &= ~DOE_START_PENDING;
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if (pdode && pdode->vde && pdode->vde->device)
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((DEVOBJ_EXTENSION2*)pdode->vde->device->DeviceObjectExtension)->ExtensionFlags &= ~DOE_START_PENDING;
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}
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mountmgr_notification(&pdode->uuid);
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}
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/* If booting from Btrfs, Windows will pass the device object for the raw partition to
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* mount_vol - which is no good to us, as we only use the \Device\Btrfs{} devices we
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* create so that RAID works correctly.
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* At the time check_system_root gets called, \SystemRoot is a symlink to the ARC device,
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* e.g. \ArcName\multi(0)disk(0)rdisk(0)partition(1)\Windows. We can't change the symlink,
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* as it gets clobbered by IopReassignSystemRoot shortly afterwards, and we can't touch
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* the \ArcName symlinks as they haven't been created yet. Instead, we need to change the
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* symlink \Device\HarddiskX\PartitionY, which is what the ArcName symlink will shortly
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* point to.
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*/
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void __stdcall check_system_root(PDRIVER_OBJECT DriverObject, PVOID Context, ULONG Count) {
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system_root sr;
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LIST_ENTRY* le;
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bool done = false;
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PDEVICE_OBJECT pdo_to_add = NULL;
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volume_child* boot_vc = NULL;
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TRACE("(%p, %p, %lu)\n", DriverObject, Context, Count);
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// wait for any PNP notifications in progress to finish
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ExAcquireResourceExclusiveLite(&boot_lock, TRUE);
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ExReleaseResourceLite(&boot_lock);
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get_system_root(&sr);
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if (sr.type == system_root_partition) {
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TRACE("system boot partition is disk %u, partition %u\n", sr.disk_num, sr.partition_num);
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ExAcquireResourceSharedLite(&pdo_list_lock, true);
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le = pdo_list.Flink;
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while (le != &pdo_list) {
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LIST_ENTRY* le2;
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pdo_device_extension* pdode = CONTAINING_RECORD(le, pdo_device_extension, list_entry);
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|
|
ExAcquireResourceSharedLite(&pdode->child_lock, true);
|
|
|
|
le2 = pdode->children.Flink;
|
|
|
|
while (le2 != &pdode->children) {
|
|
volume_child* vc = CONTAINING_RECORD(le2, volume_child, list_entry);
|
|
|
|
if (vc->disk_num == sr.disk_num && vc->part_num == sr.partition_num) {
|
|
change_symlink(sr.disk_num, sr.partition_num, &pdode->uuid);
|
|
done = true;
|
|
|
|
vc->boot_volume = true;
|
|
boot_uuid = pdode->uuid;
|
|
|
|
if (!pdode->vde)
|
|
pdo_to_add = pdode->pdo;
|
|
|
|
boot_vc = vc;
|
|
|
|
break;
|
|
}
|
|
|
|
le2 = le2->Flink;
|
|
}
|
|
|
|
if (done) {
|
|
le2 = pdode->children.Flink;
|
|
|
|
while (le2 != &pdode->children) {
|
|
volume_child* vc = CONTAINING_RECORD(le2, volume_child, list_entry);
|
|
|
|
/* On Windows 7 we need to clear the DO_SYSTEM_BOOT_PARTITION flag of
|
|
* all of our underlying partition objects - otherwise IopMountVolume
|
|
* will bugcheck with UNMOUNTABLE_BOOT_VOLUME when it tries and fails
|
|
* to mount one. */
|
|
if (vc->devobj) {
|
|
PDEVICE_OBJECT dev = vc->devobj;
|
|
|
|
ObReferenceObject(dev);
|
|
|
|
while (dev) {
|
|
PDEVICE_OBJECT dev2 = IoGetLowerDeviceObject(dev);
|
|
|
|
dev->Flags &= ~DO_SYSTEM_BOOT_PARTITION;
|
|
|
|
ObDereferenceObject(dev);
|
|
|
|
dev = dev2;
|
|
}
|
|
}
|
|
|
|
le2 = le2->Flink;
|
|
}
|
|
|
|
ExReleaseResourceLite(&pdode->child_lock);
|
|
|
|
break;
|
|
}
|
|
|
|
ExReleaseResourceLite(&pdode->child_lock);
|
|
|
|
le = le->Flink;
|
|
}
|
|
|
|
ExReleaseResourceLite(&pdo_list_lock);
|
|
} else if (sr.type == system_root_btrfs) {
|
|
boot_uuid = sr.uuid;
|
|
|
|
ExAcquireResourceSharedLite(&pdo_list_lock, true);
|
|
|
|
le = pdo_list.Flink;
|
|
while (le != &pdo_list) {
|
|
pdo_device_extension* pdode = CONTAINING_RECORD(le, pdo_device_extension, list_entry);
|
|
|
|
if (RtlCompareMemory(&pdode->uuid, &sr.uuid, sizeof(BTRFS_UUID)) == sizeof(BTRFS_UUID)) {
|
|
if (!pdode->vde)
|
|
pdo_to_add = pdode->pdo;
|
|
|
|
break;
|
|
}
|
|
|
|
le = le->Flink;
|
|
}
|
|
|
|
ExReleaseResourceLite(&pdo_list_lock);
|
|
}
|
|
|
|
if (boot_vc) {
|
|
NTSTATUS Status;
|
|
UNICODE_STRING name;
|
|
|
|
/* On Windows 8, mountmgr!MountMgrFindBootVolume returns the first volume in its database
|
|
* with the DO_SYSTEM_BOOT_PARTITION flag set. We've cleared the bit on the underlying devices,
|
|
* but as it caches it we need to disable and re-enable the volume so mountmgr receives a PNP
|
|
* notification to refresh its list. */
|
|
|
|
static const WCHAR prefix[] = L"\\??";
|
|
|
|
name.Length = name.MaximumLength = boot_vc->pnp_name.Length + sizeof(prefix) - sizeof(WCHAR);
|
|
|
|
name.Buffer = ExAllocatePoolWithTag(PagedPool, name.MaximumLength, ALLOC_TAG);
|
|
if (!name.Buffer)
|
|
ERR("out of memory\n");
|
|
else {
|
|
RtlCopyMemory(name.Buffer, prefix, sizeof(prefix) - sizeof(WCHAR));
|
|
RtlCopyMemory(&name.Buffer[(sizeof(prefix) / sizeof(WCHAR)) - 1], boot_vc->pnp_name.Buffer, boot_vc->pnp_name.Length);
|
|
|
|
Status = IoSetDeviceInterfaceState(&name, false);
|
|
if (!NT_SUCCESS(Status))
|
|
ERR("IoSetDeviceInterfaceState returned %08lx\n", Status);
|
|
|
|
Status = IoSetDeviceInterfaceState(&name, true);
|
|
if (!NT_SUCCESS(Status))
|
|
ERR("IoSetDeviceInterfaceState returned %08lx\n", Status);
|
|
|
|
ExFreePool(name.Buffer);
|
|
}
|
|
}
|
|
|
|
if (sr.type == system_root_btrfs || boot_vc)
|
|
check_boot_options();
|
|
|
|
// If our FS depends on volumes that aren't there when we do our IoRegisterPlugPlayNotification calls
|
|
// in DriverEntry, bus_query_device_relations won't get called until it's too late. We need to do our
|
|
// own call to AddDevice here as a result. We need to clear the DOE_START_PENDING bits, or NtOpenFile
|
|
// will return STATUS_NO_SUCH_DEVICE.
|
|
if (pdo_to_add)
|
|
boot_add_device(pdo_to_add);
|
|
}
|