+++ /dev/null
-/* 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*)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)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*)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 %08x\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 %08x\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", 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 %08x\n", Status);
- return Status;
- }
-
- Status = get_device_pnp_name(DeviceObject, &pnp_name, &guid);
- if (!NT_SUCCESS(Status)) {
- ERR("get_device_pnp_name returned %08x\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 %08x\n", Status);
- }
-
- ObDereferenceObject(FileObject);
-
- volume_removal(drvobj, &pnp_name);
-
- if (RtlCompareMemory(guid, &GUID_DEVINTERFACE_DISK, sizeof(GUID)) == sizeof(GUID))
- disk_arrival(drvobj, &pnp_name);
- else
- volume_arrival(drvobj, &pnp_name);
-
- 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;
-
- default:
- TRACE("unhandled ioctl %x\n", IrpSp->Parameters.DeviceIoControl.IoControlCode);
- Status = STATUS_NOT_IMPLEMENTED;
- break;
- }
-
- return Status;
-}
-
-_Dispatch_type_(IRP_MJ_DEVICE_CONTROL)
-_Function_class_(DRIVER_DISPATCH)
-NTSTATUS 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;
- }
-
- if (!IrpSp->FileObject || IrpSp->FileObject->FsContext != Vcb->volume_fcb) {
- 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 %x\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 %08x\n", Status);
-
- if (top_level)
- IoSetTopLevelIrp(NULL);
-
- FsRtlExitFileSystem();
-
- return Status;
-}
projects / reactos.git / blobdiff