mirror of
https://github.com/reactos/reactos.git
synced 2024-12-29 10:35:28 +00:00
334 lines
9.2 KiB
C
334 lines
9.2 KiB
C
/*
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* COPYRIGHT: See COPYING in the top level directory
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* PROJECT: ReactOS kernel
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* FILE: drivers/filesystems/msfs/create.c
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* PURPOSE: Mailslot filesystem
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* PROGRAMMER: Eric Kohl
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* Nikita Pechenkin (n.pechenkin@mail.ru)
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*/
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/* INCLUDES ******************************************************************/
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#include "msfs.h"
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#include <ndk/iotypes.h>
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#define NDEBUG
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#include <debug.h>
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/* FUNCTIONS *****************************************************************/
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/* Creates the client side */
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NTSTATUS DEFAULTAPI
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MsfsCreate(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PIO_STACK_LOCATION IoStack;
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PFILE_OBJECT FileObject;
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PMSFS_DEVICE_EXTENSION DeviceExtension;
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PMSFS_FCB Fcb;
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PMSFS_CCB Ccb;
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PMSFS_FCB current = NULL;
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PLIST_ENTRY current_entry;
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KIRQL oldIrql;
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DPRINT("MsfsCreate(DeviceObject %p Irp %p)\n", DeviceObject, Irp);
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IoStack = IoGetCurrentIrpStackLocation(Irp);
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DeviceExtension = DeviceObject->DeviceExtension;
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FileObject = IoStack->FileObject;
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DPRINT("Mailslot name: %wZ\n", &FileObject->FileName);
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Ccb = ExAllocatePoolWithTag(NonPagedPool, sizeof(MSFS_CCB), 'cFsM');
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if (Ccb == NULL)
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{
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Irp->IoStatus.Status = STATUS_NO_MEMORY;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_NO_MEMORY;
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}
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KeLockMutex(&DeviceExtension->FcbListLock);
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current_entry = DeviceExtension->FcbListHead.Flink;
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while (current_entry != &DeviceExtension->FcbListHead)
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{
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current = CONTAINING_RECORD(current_entry,
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MSFS_FCB,
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FcbListEntry);
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if (!RtlCompareUnicodeString(&FileObject->FileName, ¤t->Name, TRUE))
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break;
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current_entry = current_entry->Flink;
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}
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if (current_entry == &DeviceExtension->FcbListHead)
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{
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ExFreePoolWithTag(Ccb, 'cFsM');
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_UNSUCCESSFUL;
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}
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Fcb = current;
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KeAcquireSpinLock(&Fcb->CcbListLock, &oldIrql);
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InsertTailList(&Fcb->CcbListHead, &Ccb->CcbListEntry);
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KeReleaseSpinLock(&Fcb->CcbListLock, oldIrql);
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Fcb->ReferenceCount++;
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Ccb->Fcb = Fcb;
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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FileObject->FsContext = Fcb;
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FileObject->FsContext2 = Ccb;
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FileObject->Flags |= FO_MAILSLOT;
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_SUCCESS;
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}
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/* Creates the server side */
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NTSTATUS DEFAULTAPI
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MsfsCreateMailslot(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PEXTENDED_IO_STACK_LOCATION IoStack;
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PFILE_OBJECT FileObject;
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PMSFS_DEVICE_EXTENSION DeviceExtension;
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PMSFS_FCB Fcb;
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PMSFS_CCB Ccb;
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KIRQL oldIrql;
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PLIST_ENTRY current_entry;
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PMSFS_FCB current = NULL;
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PMAILSLOT_CREATE_PARAMETERS Buffer;
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DPRINT("MsfsCreateMailslot(DeviceObject %p Irp %p)\n", DeviceObject, Irp);
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IoStack = (PEXTENDED_IO_STACK_LOCATION)IoGetCurrentIrpStackLocation(Irp);
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DeviceExtension = DeviceObject->DeviceExtension;
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FileObject = IoStack->FileObject;
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Buffer = IoStack->Parameters.CreateMailslot.Parameters;
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DPRINT("Mailslot name: %wZ\n", &FileObject->FileName);
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Fcb = ExAllocatePoolWithTag(NonPagedPool, sizeof(MSFS_FCB), 'fFsM');
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if (Fcb == NULL)
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{
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Irp->IoStatus.Status = STATUS_NO_MEMORY;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_NO_MEMORY;
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}
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Fcb->Name.Length = FileObject->FileName.Length;
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Fcb->Name.MaximumLength = Fcb->Name.Length + sizeof(UNICODE_NULL);
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Fcb->Name.Buffer = ExAllocatePoolWithTag(NonPagedPool,
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Fcb->Name.MaximumLength,
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'NFsM');
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if (Fcb->Name.Buffer == NULL)
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{
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ExFreePoolWithTag(Fcb, 'fFsM');
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Irp->IoStatus.Status = STATUS_NO_MEMORY;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_NO_MEMORY;
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}
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RtlCopyUnicodeString(&Fcb->Name, &FileObject->FileName);
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Ccb = ExAllocatePoolWithTag(NonPagedPool, sizeof(MSFS_CCB), 'cFsM');
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if (Ccb == NULL)
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{
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ExFreePoolWithTag(Fcb->Name.Buffer, 'NFsM');
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ExFreePoolWithTag(Fcb, 'fFsM');
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Irp->IoStatus.Status = STATUS_NO_MEMORY;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_NO_MEMORY;
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}
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Fcb->ReferenceCount = 0;
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InitializeListHead(&Fcb->CcbListHead);
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KeInitializeSpinLock(&Fcb->CcbListLock);
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Fcb->MaxMessageSize = Buffer->MaximumMessageSize;
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Fcb->MessageCount = 0;
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Fcb->TimeOut = Buffer->ReadTimeout;
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InitializeListHead(&Fcb->MessageListHead);
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KeInitializeSpinLock(&Fcb->MessageListLock);
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KeInitializeSpinLock(&Fcb->QueueLock);
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InitializeListHead(&Fcb->PendingIrpQueue);
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IoCsqInitialize(&Fcb->CancelSafeQueue,
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MsfsInsertIrp,
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MsfsRemoveIrp,
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MsfsPeekNextIrp,
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MsfsAcquireLock,
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MsfsReleaseLock,
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MsfsCompleteCanceledIrp);
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KeLockMutex(&DeviceExtension->FcbListLock);
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current_entry = DeviceExtension->FcbListHead.Flink;
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while (current_entry != &DeviceExtension->FcbListHead)
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{
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current = CONTAINING_RECORD(current_entry,
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MSFS_FCB,
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FcbListEntry);
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if (!RtlCompareUnicodeString(&Fcb->Name, ¤t->Name, TRUE))
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break;
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current_entry = current_entry->Flink;
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}
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if (current_entry != &DeviceExtension->FcbListHead)
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{
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ExFreePoolWithTag(Fcb->Name.Buffer, 'NFsM');
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ExFreePoolWithTag(Fcb, 'fFsM');
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ExFreePoolWithTag(Ccb, 'cFsM');
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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Irp->IoStatus.Status = STATUS_UNSUCCESSFUL;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_UNSUCCESSFUL;
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}
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else
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{
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InsertTailList(&DeviceExtension->FcbListHead,
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&Fcb->FcbListEntry);
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}
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KeAcquireSpinLock(&Fcb->CcbListLock, &oldIrql);
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InsertTailList(&Fcb->CcbListHead, &Ccb->CcbListEntry);
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KeReleaseSpinLock(&Fcb->CcbListLock, oldIrql);
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Fcb->ReferenceCount++;
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Fcb->ServerCcb = Ccb;
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Ccb->Fcb = Fcb;
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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FileObject->FsContext = Fcb;
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FileObject->FsContext2 = Ccb;
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FileObject->Flags |= FO_MAILSLOT;
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_SUCCESS;
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}
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NTSTATUS DEFAULTAPI
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MsfsClose(PDEVICE_OBJECT DeviceObject,
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PIRP Irp)
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{
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PIO_STACK_LOCATION IoStack;
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PFILE_OBJECT FileObject;
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PMSFS_DEVICE_EXTENSION DeviceExtension;
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PMSFS_FCB Fcb;
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PMSFS_CCB Ccb;
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PMSFS_MESSAGE Message;
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KIRQL oldIrql;
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DPRINT("MsfsClose(DeviceObject %p Irp %p)\n", DeviceObject, Irp);
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IoStack = IoGetCurrentIrpStackLocation(Irp);
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DeviceExtension = DeviceObject->DeviceExtension;
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FileObject = IoStack->FileObject;
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KeLockMutex(&DeviceExtension->FcbListLock);
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if (DeviceExtension->FcbListHead.Flink == &DeviceExtension->FcbListHead)
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{
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_SUCCESS;
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}
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Fcb = FileObject->FsContext;
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Ccb = FileObject->FsContext2;
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DPRINT("Mailslot name: %wZ\n", &Fcb->Name);
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Fcb->ReferenceCount--;
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if (Fcb->ServerCcb == Ccb)
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{
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/* delete all messages from message-list */
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KeAcquireSpinLock(&Fcb->MessageListLock, &oldIrql);
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while (Fcb->MessageListHead.Flink != &Fcb->MessageListHead)
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{
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Message = CONTAINING_RECORD(Fcb->MessageListHead.Flink,
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MSFS_MESSAGE,
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MessageListEntry);
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RemoveEntryList(Fcb->MessageListHead.Flink);
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ExFreePoolWithTag(Message, 'rFsM');
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}
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Fcb->MessageCount = 0;
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KeReleaseSpinLock(&Fcb->MessageListLock, oldIrql);
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Fcb->ServerCcb = NULL;
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}
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KeAcquireSpinLock(&Fcb->CcbListLock, &oldIrql);
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RemoveEntryList(&Ccb->CcbListEntry);
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KeReleaseSpinLock(&Fcb->CcbListLock, oldIrql);
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ExFreePoolWithTag(Ccb, 'cFsM');
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FileObject->FsContext2 = NULL;
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if (Fcb->ReferenceCount == 0)
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{
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DPRINT("ReferenceCount == 0: Deleting mailslot data\n");
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RemoveEntryList(&Fcb->FcbListEntry);
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ExFreePoolWithTag(Fcb->Name.Buffer, 'NFsM');
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ExFreePoolWithTag(Fcb, 'fFsM');
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}
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KeUnlockMutex(&DeviceExtension->FcbListLock);
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Irp->IoStatus.Status = STATUS_SUCCESS;
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Irp->IoStatus.Information = 0;
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IoCompleteRequest(Irp, IO_NO_INCREMENT);
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return STATUS_SUCCESS;
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}
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/* EOF */
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