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693 lines
19 KiB
C
693 lines
19 KiB
C
/* Copyright (c) Mark Harmstone 2016-17
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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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struct pnp_context;
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typedef struct {
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struct pnp_context* context;
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PIRP Irp;
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IO_STATUS_BLOCK iosb;
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NTSTATUS Status;
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device* dev;
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} pnp_stripe;
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typedef struct {
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KEVENT Event;
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NTSTATUS Status;
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LONG left;
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pnp_stripe* stripes;
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} pnp_context;
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extern ERESOURCE pdo_list_lock;
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extern LIST_ENTRY pdo_list;
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_Function_class_(IO_COMPLETION_ROUTINE)
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static NTSTATUS __stdcall pnp_completion(PDEVICE_OBJECT DeviceObject, PIRP Irp, PVOID conptr) {
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pnp_stripe* stripe = conptr;
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pnp_context* context = (pnp_context*)stripe->context;
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UNUSED(DeviceObject);
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stripe->Status = Irp->IoStatus.Status;
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InterlockedDecrement(&context->left);
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if (context->left == 0)
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KeSetEvent(&context->Event, 0, false);
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return STATUS_MORE_PROCESSING_REQUIRED;
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}
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static NTSTATUS send_disks_pnp_message(device_extension* Vcb, UCHAR minor) {
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pnp_context context;
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ULONG num_devices, i;
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NTSTATUS Status;
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LIST_ENTRY* le;
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RtlZeroMemory(&context, sizeof(pnp_context));
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KeInitializeEvent(&context.Event, NotificationEvent, false);
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num_devices = (ULONG)min(0xffffffff, Vcb->superblock.num_devices);
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context.stripes = ExAllocatePoolWithTag(NonPagedPool, sizeof(pnp_stripe) * num_devices, ALLOC_TAG);
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if (!context.stripes) {
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ERR("out of memory\n");
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlZeroMemory(context.stripes, sizeof(pnp_stripe) * num_devices);
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i = 0;
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le = Vcb->devices.Flink;
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while (le != &Vcb->devices) {
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PIO_STACK_LOCATION IrpSp;
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device* dev = CONTAINING_RECORD(le, device, list_entry);
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if (dev->devobj) {
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context.stripes[i].context = (struct pnp_context*)&context;
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context.stripes[i].Irp = IoAllocateIrp(dev->devobj->StackSize, false);
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if (!context.stripes[i].Irp) {
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uint64_t j;
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ERR("IoAllocateIrp failed\n");
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for (j = 0; j < i; j++) {
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if (context.stripes[j].dev->devobj) {
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IoFreeIrp(context.stripes[j].Irp);
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}
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}
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ExFreePool(context.stripes);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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IrpSp = IoGetNextIrpStackLocation(context.stripes[i].Irp);
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IrpSp->MajorFunction = IRP_MJ_PNP;
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IrpSp->MinorFunction = minor;
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IrpSp->FileObject = dev->fileobj;
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context.stripes[i].Irp->UserIosb = &context.stripes[i].iosb;
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IoSetCompletionRoutine(context.stripes[i].Irp, pnp_completion, &context.stripes[i], true, true, true);
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context.stripes[i].Irp->IoStatus.Status = STATUS_NOT_SUPPORTED;
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context.stripes[i].dev = dev;
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context.left++;
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}
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le = le->Flink;
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}
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if (context.left == 0) {
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Status = STATUS_SUCCESS;
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goto end;
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}
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for (i = 0; i < num_devices; i++) {
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if (context.stripes[i].Irp) {
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IoCallDriver(context.stripes[i].dev->devobj, context.stripes[i].Irp);
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}
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}
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KeWaitForSingleObject(&context.Event, Executive, KernelMode, false, NULL);
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Status = STATUS_SUCCESS;
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for (i = 0; i < num_devices; i++) {
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if (context.stripes[i].Irp) {
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if (context.stripes[i].Status != STATUS_SUCCESS)
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Status = context.stripes[i].Status;
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}
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}
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end:
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for (i = 0; i < num_devices; i++) {
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if (context.stripes[i].Irp) {
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IoFreeIrp(context.stripes[i].Irp);
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}
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}
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ExFreePool(context.stripes);
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return Status;
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}
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static NTSTATUS pnp_cancel_remove_device(PDEVICE_OBJECT DeviceObject) {
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device_extension* Vcb = DeviceObject->DeviceExtension;
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NTSTATUS Status;
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ExAcquireResourceSharedLite(&Vcb->tree_lock, true);
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ExAcquireResourceExclusiveLite(&Vcb->fileref_lock, true);
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if (Vcb->root_fileref && Vcb->root_fileref->fcb && (Vcb->root_fileref->open_count > 0 || has_open_children(Vcb->root_fileref))) {
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Status = STATUS_ACCESS_DENIED;
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goto end;
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}
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Status = send_disks_pnp_message(Vcb, IRP_MN_CANCEL_REMOVE_DEVICE);
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if (!NT_SUCCESS(Status)) {
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WARN("send_disks_pnp_message returned %08lx\n", Status);
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goto end;
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}
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end:
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ExReleaseResourceLite(&Vcb->fileref_lock);
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ExReleaseResourceLite(&Vcb->tree_lock);
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return STATUS_SUCCESS;
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}
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NTSTATUS pnp_query_remove_device(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
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device_extension* Vcb = DeviceObject->DeviceExtension;
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NTSTATUS Status;
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ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
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if (Vcb->root_fileref && Vcb->root_fileref->fcb && (Vcb->root_fileref->open_count > 0 || has_open_children(Vcb->root_fileref))) {
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ExReleaseResourceLite(&Vcb->tree_lock);
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return STATUS_ACCESS_DENIED;
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}
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Status = send_disks_pnp_message(Vcb, IRP_MN_QUERY_REMOVE_DEVICE);
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if (!NT_SUCCESS(Status)) {
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WARN("send_disks_pnp_message returned %08lx\n", Status);
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ExReleaseResourceLite(&Vcb->tree_lock);
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return Status;
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}
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Vcb->removing = true;
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if (Vcb->need_write && !Vcb->readonly) {
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Status = do_write(Vcb, Irp);
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free_trees(Vcb);
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if (!NT_SUCCESS(Status)) {
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ERR("do_write returned %08lx\n", Status);
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ExReleaseResourceLite(&Vcb->tree_lock);
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return Status;
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}
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}
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ExReleaseResourceLite(&Vcb->tree_lock);
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if (Vcb->open_files == 0)
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uninit(Vcb);
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return STATUS_SUCCESS;
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}
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static NTSTATUS pnp_remove_device(PDEVICE_OBJECT DeviceObject) {
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device_extension* Vcb = DeviceObject->DeviceExtension;
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NTSTATUS Status;
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ExAcquireResourceSharedLite(&Vcb->tree_lock, true);
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Status = send_disks_pnp_message(Vcb, IRP_MN_REMOVE_DEVICE);
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if (!NT_SUCCESS(Status))
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WARN("send_disks_pnp_message returned %08lx\n", Status);
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ExReleaseResourceLite(&Vcb->tree_lock);
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if (DeviceObject->Vpb->Flags & VPB_MOUNTED) {
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Status = FsRtlNotifyVolumeEvent(Vcb->root_file, FSRTL_VOLUME_DISMOUNT);
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if (!NT_SUCCESS(Status)) {
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WARN("FsRtlNotifyVolumeEvent returned %08lx\n", Status);
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}
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if (Vcb->vde)
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Vcb->vde->mounted_device = NULL;
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ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
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Vcb->removing = true;
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ExReleaseResourceLite(&Vcb->tree_lock);
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if (Vcb->open_files == 0)
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uninit(Vcb);
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}
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return STATUS_SUCCESS;
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}
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NTSTATUS pnp_surprise_removal(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
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device_extension* Vcb = DeviceObject->DeviceExtension;
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TRACE("(%p, %p)\n", DeviceObject, Irp);
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if (DeviceObject->Vpb->Flags & VPB_MOUNTED) {
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ExAcquireResourceExclusiveLite(&Vcb->tree_lock, true);
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if (Vcb->vde)
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Vcb->vde->mounted_device = NULL;
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Vcb->removing = true;
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ExReleaseResourceLite(&Vcb->tree_lock);
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if (Vcb->open_files == 0)
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uninit(Vcb);
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}
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return STATUS_SUCCESS;
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}
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static NTSTATUS bus_query_capabilities(PIRP Irp) {
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
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PDEVICE_CAPABILITIES dc = IrpSp->Parameters.DeviceCapabilities.Capabilities;
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dc->UniqueID = true;
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dc->SilentInstall = true;
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return STATUS_SUCCESS;
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}
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static NTSTATUS bus_query_device_relations(PIRP Irp) {
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NTSTATUS Status;
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ULONG num_children;
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LIST_ENTRY* le;
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ULONG drsize, i;
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DEVICE_RELATIONS* dr;
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ExAcquireResourceSharedLite(&pdo_list_lock, true);
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num_children = 0;
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le = pdo_list.Flink;
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while (le != &pdo_list) {
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pdo_device_extension* pdode = CONTAINING_RECORD(le, pdo_device_extension, list_entry);
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if (!pdode->dont_report)
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num_children++;
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le = le->Flink;
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}
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drsize = offsetof(DEVICE_RELATIONS, Objects[0]) + (num_children * sizeof(PDEVICE_OBJECT));
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dr = ExAllocatePoolWithTag(PagedPool, drsize, ALLOC_TAG);
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if (!dr) {
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ERR("out of memory\n");
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Status = STATUS_INSUFFICIENT_RESOURCES;
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goto end;
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}
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dr->Count = num_children;
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i = 0;
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le = pdo_list.Flink;
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while (le != &pdo_list) {
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pdo_device_extension* pdode = CONTAINING_RECORD(le, pdo_device_extension, list_entry);
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if (!pdode->dont_report) {
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ObReferenceObject(pdode->pdo);
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dr->Objects[i] = pdode->pdo;
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i++;
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}
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le = le->Flink;
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}
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Irp->IoStatus.Information = (ULONG_PTR)dr;
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Status = STATUS_SUCCESS;
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end:
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ExReleaseResourceLite(&pdo_list_lock);
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return Status;
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}
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static NTSTATUS bus_query_hardware_ids(PIRP Irp) {
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WCHAR* out;
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static const WCHAR ids[] = L"ROOT\\btrfs\0";
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out = ExAllocatePoolWithTag(PagedPool, sizeof(ids), ALLOC_TAG);
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if (!out) {
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ERR("out of memory\n");
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlCopyMemory(out, ids, sizeof(ids));
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Irp->IoStatus.Information = (ULONG_PTR)out;
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return STATUS_SUCCESS;
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}
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static NTSTATUS bus_pnp(bus_device_extension* bde, PIRP Irp) {
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NTSTATUS Status = Irp->IoStatus.Status;
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
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bool handled = false;
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switch (IrpSp->MinorFunction) {
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case IRP_MN_QUERY_CAPABILITIES:
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Status = bus_query_capabilities(Irp);
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handled = true;
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break;
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case IRP_MN_QUERY_DEVICE_RELATIONS:
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if (IrpSp->Parameters.QueryDeviceRelations.Type != BusRelations || no_pnp)
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break;
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Status = bus_query_device_relations(Irp);
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handled = true;
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break;
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case IRP_MN_QUERY_ID:
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if (IrpSp->Parameters.QueryId.IdType != BusQueryHardwareIDs)
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break;
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Status = bus_query_hardware_ids(Irp);
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handled = true;
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break;
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}
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if (!NT_SUCCESS(Status) && handled) {
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Irp->IoStatus.Status = Status;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return Status;
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}
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Irp->IoStatus.Status = Status;
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IoSkipCurrentIrpStackLocation(Irp);
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return IoCallDriver(bde->attached_device, Irp);
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}
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static NTSTATUS pdo_query_device_id(pdo_device_extension* pdode, PIRP Irp) {
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WCHAR name[100], *noff, *out;
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int i;
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static const WCHAR pref[] = L"Btrfs\\";
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RtlCopyMemory(name, pref, sizeof(pref) - sizeof(WCHAR));
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noff = &name[(sizeof(pref) / sizeof(WCHAR)) - 1];
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for (i = 0; i < 16; i++) {
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*noff = hex_digit(pdode->uuid.uuid[i] >> 4); noff++;
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*noff = hex_digit(pdode->uuid.uuid[i] & 0xf); noff++;
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if (i == 3 || i == 5 || i == 7 || i == 9) {
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*noff = '-';
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noff++;
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}
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}
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*noff = 0;
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out = ExAllocatePoolWithTag(PagedPool, (wcslen(name) + 1) * sizeof(WCHAR), ALLOC_TAG);
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if (!out) {
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ERR("out of memory\n");
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlCopyMemory(out, name, (wcslen(name) + 1) * sizeof(WCHAR));
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Irp->IoStatus.Information = (ULONG_PTR)out;
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return STATUS_SUCCESS;
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}
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static NTSTATUS pdo_query_hardware_ids(PIRP Irp) {
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WCHAR* out;
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static const WCHAR ids[] = L"BtrfsVolume\0";
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out = ExAllocatePoolWithTag(PagedPool, sizeof(ids), ALLOC_TAG);
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if (!out) {
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ERR("out of memory\n");
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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RtlCopyMemory(out, ids, sizeof(ids));
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Irp->IoStatus.Information = (ULONG_PTR)out;
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return STATUS_SUCCESS;
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}
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static NTSTATUS pdo_query_id(pdo_device_extension* pdode, PIRP Irp) {
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
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switch (IrpSp->Parameters.QueryId.IdType) {
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case BusQueryDeviceID:
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TRACE("BusQueryDeviceID\n");
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return pdo_query_device_id(pdode, Irp);
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case BusQueryHardwareIDs:
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TRACE("BusQueryHardwareIDs\n");
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return pdo_query_hardware_ids(Irp);
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default:
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break;
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}
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return Irp->IoStatus.Status;
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}
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typedef struct {
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IO_STATUS_BLOCK iosb;
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KEVENT Event;
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NTSTATUS Status;
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} device_usage_context;
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_Function_class_(IO_COMPLETION_ROUTINE)
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static NTSTATUS __stdcall device_usage_completion(PDEVICE_OBJECT DeviceObject, PIRP Irp, PVOID conptr) {
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device_usage_context* context = conptr;
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UNUSED(DeviceObject);
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context->Status = Irp->IoStatus.Status;
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KeSetEvent(&context->Event, 0, false);
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return STATUS_MORE_PROCESSING_REQUIRED;
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}
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static NTSTATUS pdo_device_usage_notification(pdo_device_extension* pdode, PIRP Irp) {
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PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
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LIST_ENTRY* le;
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TRACE("(%p, %p)\n", pdode, Irp);
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ExAcquireResourceSharedLite(&pdode->child_lock, true);
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le = pdode->children.Flink;
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while (le != &pdode->children) {
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volume_child* vc = CONTAINING_RECORD(le, volume_child, list_entry);
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if (vc->devobj) {
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PIRP Irp2;
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PIO_STACK_LOCATION IrpSp2;
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device_usage_context context;
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Irp2 = IoAllocateIrp(vc->devobj->StackSize, false);
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if (!Irp2) {
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ERR("out of memory\n");
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ExReleaseResourceLite(&pdode->child_lock);
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return STATUS_INSUFFICIENT_RESOURCES;
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}
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IrpSp2 = IoGetNextIrpStackLocation(Irp2);
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IrpSp2->MajorFunction = IRP_MJ_PNP;
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IrpSp2->MinorFunction = IRP_MN_DEVICE_USAGE_NOTIFICATION;
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IrpSp2->Parameters.UsageNotification = IrpSp->Parameters.UsageNotification;
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IrpSp2->FileObject = vc->fileobj;
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context.iosb.Status = STATUS_SUCCESS;
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Irp2->UserIosb = &context.iosb;
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KeInitializeEvent(&context.Event, NotificationEvent, false);
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Irp2->UserEvent = &context.Event;
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IoSetCompletionRoutine(Irp2, device_usage_completion, &context, true, true, true);
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context.Status = IoCallDriver(vc->devobj, Irp2);
|
|
|
|
if (context.Status == STATUS_PENDING)
|
|
KeWaitForSingleObject(&context.Event, Executive, KernelMode, false, NULL);
|
|
|
|
if (!NT_SUCCESS(context.Status)) {
|
|
ERR("IoCallDriver returned %08lx\n", context.Status);
|
|
ExReleaseResourceLite(&pdode->child_lock);
|
|
return context.Status;
|
|
}
|
|
}
|
|
|
|
le = le->Flink;
|
|
}
|
|
|
|
ExReleaseResourceLite(&pdode->child_lock);
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
static NTSTATUS pdo_query_device_relations(PDEVICE_OBJECT pdo, PIRP Irp) {
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
|
|
PDEVICE_RELATIONS device_relations;
|
|
|
|
if (IrpSp->Parameters.QueryDeviceRelations.Type != TargetDeviceRelation)
|
|
return Irp->IoStatus.Status;
|
|
|
|
device_relations = ExAllocatePoolWithTag(PagedPool, sizeof(DEVICE_RELATIONS), ALLOC_TAG);
|
|
if (!device_relations) {
|
|
ERR("out of memory\n");
|
|
return STATUS_INSUFFICIENT_RESOURCES;
|
|
}
|
|
|
|
device_relations->Count = 1;
|
|
device_relations->Objects[0] = pdo;
|
|
|
|
ObReferenceObject(pdo);
|
|
|
|
Irp->IoStatus.Information = (ULONG_PTR)device_relations;
|
|
|
|
return STATUS_SUCCESS;
|
|
}
|
|
|
|
static NTSTATUS pdo_pnp(PDEVICE_OBJECT pdo, PIRP Irp) {
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
|
|
pdo_device_extension* pdode = pdo->DeviceExtension;
|
|
|
|
switch (IrpSp->MinorFunction) {
|
|
case IRP_MN_QUERY_ID:
|
|
return pdo_query_id(pdode, Irp);
|
|
|
|
case IRP_MN_START_DEVICE:
|
|
case IRP_MN_CANCEL_REMOVE_DEVICE:
|
|
case IRP_MN_SURPRISE_REMOVAL:
|
|
case IRP_MN_REMOVE_DEVICE:
|
|
return STATUS_SUCCESS;
|
|
|
|
case IRP_MN_QUERY_REMOVE_DEVICE:
|
|
return STATUS_UNSUCCESSFUL;
|
|
|
|
case IRP_MN_DEVICE_USAGE_NOTIFICATION:
|
|
return pdo_device_usage_notification(pdode, Irp);
|
|
|
|
case IRP_MN_QUERY_DEVICE_RELATIONS:
|
|
return pdo_query_device_relations(pdo, Irp);
|
|
}
|
|
|
|
return Irp->IoStatus.Status;
|
|
}
|
|
|
|
static NTSTATUS pnp_device_usage_notification(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
|
|
device_extension* Vcb = DeviceObject->DeviceExtension;
|
|
|
|
if (IrpSp->Parameters.UsageNotification.InPath) {
|
|
switch (IrpSp->Parameters.UsageNotification.Type) {
|
|
case DeviceUsageTypePaging:
|
|
case DeviceUsageTypeHibernation:
|
|
case DeviceUsageTypeDumpFile:
|
|
IoAdjustPagingPathCount(&Vcb->page_file_count, IrpSp->Parameters.UsageNotification.InPath);
|
|
break;
|
|
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
IoSkipCurrentIrpStackLocation(Irp);
|
|
return IoCallDriver(Vcb->Vpb->RealDevice, Irp);
|
|
}
|
|
|
|
_Dispatch_type_(IRP_MJ_PNP)
|
|
_Function_class_(DRIVER_DISPATCH)
|
|
NTSTATUS __stdcall drv_pnp(PDEVICE_OBJECT DeviceObject, PIRP Irp) {
|
|
PIO_STACK_LOCATION IrpSp = IoGetCurrentIrpStackLocation(Irp);
|
|
device_extension* Vcb = DeviceObject->DeviceExtension;
|
|
NTSTATUS Status;
|
|
bool top_level;
|
|
|
|
FsRtlEnterFileSystem();
|
|
|
|
top_level = is_top_level(Irp);
|
|
|
|
if (Vcb && Vcb->type == VCB_TYPE_BUS) {
|
|
Status = bus_pnp(DeviceObject->DeviceExtension, Irp);
|
|
goto exit;
|
|
} else if (Vcb && Vcb->type == VCB_TYPE_VOLUME) {
|
|
volume_device_extension* vde = DeviceObject->DeviceExtension;
|
|
IoSkipCurrentIrpStackLocation(Irp);
|
|
Status = IoCallDriver(vde->attached_device, Irp);
|
|
goto exit;
|
|
} else if (Vcb && Vcb->type == VCB_TYPE_PDO) {
|
|
Status = pdo_pnp(DeviceObject, Irp);
|
|
goto end;
|
|
} else if (!Vcb || Vcb->type != VCB_TYPE_FS) {
|
|
Status = STATUS_INVALID_PARAMETER;
|
|
goto end;
|
|
}
|
|
|
|
Status = STATUS_NOT_IMPLEMENTED;
|
|
|
|
switch (IrpSp->MinorFunction) {
|
|
case IRP_MN_CANCEL_REMOVE_DEVICE:
|
|
Status = pnp_cancel_remove_device(DeviceObject);
|
|
break;
|
|
|
|
case IRP_MN_QUERY_REMOVE_DEVICE:
|
|
Status = pnp_query_remove_device(DeviceObject, Irp);
|
|
break;
|
|
|
|
case IRP_MN_REMOVE_DEVICE:
|
|
Status = pnp_remove_device(DeviceObject);
|
|
break;
|
|
|
|
case IRP_MN_SURPRISE_REMOVAL:
|
|
Status = pnp_surprise_removal(DeviceObject, Irp);
|
|
break;
|
|
|
|
case IRP_MN_DEVICE_USAGE_NOTIFICATION:
|
|
Status = pnp_device_usage_notification(DeviceObject, Irp);
|
|
goto exit;
|
|
|
|
default:
|
|
TRACE("passing minor function 0x%x on\n", IrpSp->MinorFunction);
|
|
|
|
IoSkipCurrentIrpStackLocation(Irp);
|
|
Status = IoCallDriver(Vcb->Vpb->RealDevice, Irp);
|
|
goto exit;
|
|
}
|
|
|
|
end:
|
|
Irp->IoStatus.Status = Status;
|
|
|
|
IoCompleteRequest(Irp, IO_NO_INCREMENT);
|
|
|
|
exit:
|
|
TRACE("returning %08lx\n", Status);
|
|
|
|
if (top_level)
|
|
IoSetTopLevelIrp(NULL);
|
|
|
|
FsRtlExitFileSystem();
|
|
|
|
return Status;
|
|
}
|