reactos/drivers/filesystems/btrfs/devctrl.c
Vincent Franchomme f5556fdc10 [BTRFS][UBTRFS][SHELLBTRFS] Upgrade to 1.7.9 (#4417)
v1.7.9 (2021-10-02):

- Fixed deadlock when mounting on Windows 11
- Added support for BitLocker-encrypted volumes
- Improved filename checks when renaming or creating hard links
- Miscellaneous bug fixes
2022-05-03 17:30:11 +02:00

318 lines
9.8 KiB
C

/* Copyright (c) Mark Harmstone 2016-17
*
* This file is part of WinBtrfs.
*
* WinBtrfs is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public Licence as published by
* the Free Software Foundation, either version 3 of the Licence, or
* (at your option) any later version.
*
* WinBtrfs is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public Licence for more details.
*
* You should have received a copy of the GNU Lesser General Public Licence
* along with WinBtrfs. If not, see <http://www.gnu.org/licenses/>. */
#include "btrfs_drv.h"
#include <ntdddisk.h>
#include <mountdev.h>
#include <diskguid.h>
extern PDRIVER_OBJECT drvobj;
extern LIST_ENTRY VcbList;
extern ERESOURCE global_loading_lock;
static NTSTATUS mountdev_query_stable_guid(device_extension* Vcb, PIRP Irp) {
MOUNTDEV_STABLE_GUID* msg = Irp->UserBuffer;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
TRACE("IOCTL_MOUNTDEV_QUERY_STABLE_GUID\n");
if (IrpSp->Parameters.DeviceIoControl.OutputBufferLength < sizeof(MOUNTDEV_STABLE_GUID))
return STATUS_INVALID_PARAMETER;
RtlCopyMemory(&msg->StableGuid, &Vcb->superblock.uuid, sizeof(GUID));
Irp->IoStatus.Information = sizeof(MOUNTDEV_STABLE_GUID);
return STATUS_SUCCESS;
}
static NTSTATUS is_writable(device_extension* Vcb) {
TRACE("IOCTL_DISK_IS_WRITABLE\n");
return Vcb->readonly ? STATUS_MEDIA_WRITE_PROTECTED : STATUS_SUCCESS;
}
static NTSTATUS query_filesystems(void* data, ULONG length) {
NTSTATUS Status;
LIST_ENTRY *le, *le2;
btrfs_filesystem* bfs = NULL;
ULONG itemsize;
ExAcquireResourceSharedLite(&global_loading_lock, true);
if (IsListEmpty(&VcbList)) {
if (length < sizeof(btrfs_filesystem)) {
Status = STATUS_BUFFER_OVERFLOW;
goto end;
} else {
RtlZeroMemory(data, sizeof(btrfs_filesystem));
Status = STATUS_SUCCESS;
goto end;
}
}
le = VcbList.Flink;
while (le != &VcbList) {
device_extension* Vcb = CONTAINING_RECORD(le, device_extension, list_entry);
btrfs_filesystem_device* bfd;
if (bfs) {
bfs->next_entry = itemsize;
bfs = (btrfs_filesystem*)((uint8_t*)bfs + itemsize);
} else
bfs = data;
if (length < offsetof(btrfs_filesystem, device)) {
Status = STATUS_BUFFER_OVERFLOW;
goto end;
}
itemsize = offsetof(btrfs_filesystem, device);
length -= offsetof(btrfs_filesystem, device);
bfs->next_entry = 0;
RtlCopyMemory(&bfs->uuid, &Vcb->superblock.uuid, sizeof(BTRFS_UUID));
ExAcquireResourceSharedLite(&Vcb->tree_lock, true);
bfs->num_devices = (uint32_t)Vcb->superblock.num_devices;
bfd = NULL;
le2 = Vcb->devices.Flink;
while (le2 != &Vcb->devices) {
device* dev = CONTAINING_RECORD(le2, device, list_entry);
MOUNTDEV_NAME mdn;
if (bfd)
bfd = (btrfs_filesystem_device*)((uint8_t*)bfd + offsetof(btrfs_filesystem_device, name[0]) + bfd->name_length);
else
bfd = &bfs->device;
if (length < offsetof(btrfs_filesystem_device, name[0])) {
ExReleaseResourceLite(&Vcb->tree_lock);
Status = STATUS_BUFFER_OVERFLOW;
goto end;
}
itemsize += (ULONG)offsetof(btrfs_filesystem_device, name[0]);
length -= (ULONG)offsetof(btrfs_filesystem_device, name[0]);
RtlCopyMemory(&bfd->uuid, &dev->devitem.device_uuid, sizeof(BTRFS_UUID));
if (dev->devobj) {
Status = dev_ioctl(dev->devobj, IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, NULL, 0, &mdn, sizeof(MOUNTDEV_NAME), true, NULL);
if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_OVERFLOW) {
ExReleaseResourceLite(&Vcb->tree_lock);
ERR("IOCTL_MOUNTDEV_QUERY_DEVICE_NAME returned %08lx\n", Status);
goto end;
}
if (mdn.NameLength > length) {
ExReleaseResourceLite(&Vcb->tree_lock);
Status = STATUS_BUFFER_OVERFLOW;
goto end;
}
Status = dev_ioctl(dev->devobj, IOCTL_MOUNTDEV_QUERY_DEVICE_NAME, NULL, 0, &bfd->name_length, (ULONG)offsetof(MOUNTDEV_NAME, Name[0]) + mdn.NameLength, true, NULL);
if (!NT_SUCCESS(Status) && Status != STATUS_BUFFER_OVERFLOW) {
ExReleaseResourceLite(&Vcb->tree_lock);
ERR("IOCTL_MOUNTDEV_QUERY_DEVICE_NAME returned %08lx\n", Status);
goto end;
}
itemsize += bfd->name_length;
length -= bfd->name_length;
} else {
bfd->missing = true;
bfd->name_length = 0;
}
le2 = le2->Flink;
}
ExReleaseResourceLite(&Vcb->tree_lock);
le = le->Flink;
}
Status = STATUS_SUCCESS;
end:
ExReleaseResourceLite(&global_loading_lock);
return Status;
}
static NTSTATUS probe_volume(void* data, ULONG length, KPROCESSOR_MODE processor_mode) {
MOUNTDEV_NAME* mdn = (MOUNTDEV_NAME*)data;
UNICODE_STRING path, pnp_name;
NTSTATUS Status;
PDEVICE_OBJECT DeviceObject;
PFILE_OBJECT FileObject;
const GUID* guid;
if (length < sizeof(MOUNTDEV_NAME))
return STATUS_INVALID_PARAMETER;
if (length < offsetof(MOUNTDEV_NAME, Name[0]) + mdn->NameLength)
return STATUS_INVALID_PARAMETER;
TRACE("%.*S\n", (int)(mdn->NameLength / sizeof(WCHAR)), mdn->Name);
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_MANAGE_VOLUME_PRIVILEGE), processor_mode))
return STATUS_PRIVILEGE_NOT_HELD;
path.Buffer = mdn->Name;
path.Length = path.MaximumLength = mdn->NameLength;
Status = IoGetDeviceObjectPointer(&path, FILE_READ_ATTRIBUTES, &FileObject, &DeviceObject);
if (!NT_SUCCESS(Status)) {
ERR("IoGetDeviceObjectPointer returned %08lx\n", Status);
return Status;
}
Status = get_device_pnp_name(DeviceObject, &pnp_name, &guid);
if (!NT_SUCCESS(Status)) {
ERR("get_device_pnp_name returned %08lx\n", Status);
ObDereferenceObject(FileObject);
return Status;
}
if (RtlCompareMemory(guid, &GUID_DEVINTERFACE_DISK, sizeof(GUID)) == sizeof(GUID)) {
Status = dev_ioctl(DeviceObject, IOCTL_DISK_UPDATE_PROPERTIES, NULL, 0, NULL, 0, true, NULL);
if (!NT_SUCCESS(Status))
WARN("IOCTL_DISK_UPDATE_PROPERTIES returned %08lx\n", Status);
}
ObDereferenceObject(FileObject);
volume_removal(&pnp_name);
if (RtlCompareMemory(guid, &GUID_DEVINTERFACE_DISK, sizeof(GUID)) == sizeof(GUID))
disk_arrival(&pnp_name);
else
volume_arrival(&pnp_name, false);
return STATUS_SUCCESS;
}
static NTSTATUS ioctl_unload(PIRP Irp) {
if (!SeSinglePrivilegeCheck(RtlConvertLongToLuid(SE_LOAD_DRIVER_PRIVILEGE), Irp->RequestorMode)) {
ERR("insufficient privileges\n");
return STATUS_PRIVILEGE_NOT_HELD;
}
do_shutdown(Irp);
return STATUS_SUCCESS;
}
static NTSTATUS control_ioctl(PIRP Irp) {
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
NTSTATUS Status;
switch (IrpSp->Parameters.DeviceIoControl.IoControlCode) {
case IOCTL_BTRFS_QUERY_FILESYSTEMS:
Status = query_filesystems(map_user_buffer(Irp, NormalPagePriority), IrpSp->Parameters.FileSystemControl.OutputBufferLength);
break;
case IOCTL_BTRFS_PROBE_VOLUME:
Status = probe_volume(Irp->AssociatedIrp.SystemBuffer, IrpSp->Parameters.FileSystemControl.InputBufferLength, Irp->RequestorMode);
break;
case IOCTL_BTRFS_UNLOAD:
Status = ioctl_unload(Irp);
break;
default:
TRACE("unhandled ioctl %lx\n", IrpSp->Parameters.DeviceIoControl.IoControlCode);
Status = STATUS_NOT_IMPLEMENTED;
break;
}
return Status;
}
_Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
_Function_class_(DRIVER_DISPATCH)
NTSTATUS __stdcall drv_device_control(IN PDEVICE_OBJECT DeviceObject, IN PIRP Irp) {
NTSTATUS Status;
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
device_extension* Vcb = DeviceObject->DeviceExtension;
bool top_level;
FsRtlEnterFileSystem();
top_level = is_top_level(Irp);
Irp->IoStatus.Information = 0;
if (Vcb) {
if (Vcb->type == VCB_TYPE_CONTROL) {
Status = control_ioctl(Irp);
goto end;
} else if (Vcb->type == VCB_TYPE_VOLUME) {
Status = vol_device_control(DeviceObject, Irp);
goto end;
} else if (Vcb->type != VCB_TYPE_FS) {
Status = STATUS_INVALID_PARAMETER;
goto end;
}
} else {
Status = STATUS_INVALID_PARAMETER;
goto end;
}
switch (IrpSp->Parameters.DeviceIoControl.IoControlCode) {
case IOCTL_MOUNTDEV_QUERY_STABLE_GUID:
Status = mountdev_query_stable_guid(Vcb, Irp);
goto end;
case IOCTL_DISK_IS_WRITABLE:
Status = is_writable(Vcb);
goto end;
default:
TRACE("unhandled control code %lx\n", IrpSp->Parameters.DeviceIoControl.IoControlCode);
break;
}
IoSkipCurrentIrpStackLocation(Irp);
Status = IoCallDriver(Vcb->Vpb->RealDevice, Irp);
goto end2;
end:
Irp->IoStatus.Status = Status;
if (Status != STATUS_PENDING)
IoCompleteRequest(Irp, IO_NO_INCREMENT);
end2:
TRACE("returning %08lx\n", Status);
if (top_level)
IoSetTopLevelIrp(NULL);
FsRtlExitFileSystem();
return Status;
}