128 lines
3.5 KiB
C
128 lines
3.5 KiB
C
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//+----------------------------------------------------------------------------
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//
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// Copyright (C) 1992, Microsoft Corporation.
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//
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// File: attach.h
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//
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// Contents: This module defines the data structures used in attaching
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// to an existing file system volume.
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//
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// Functions:
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//
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//-----------------------------------------------------------------------------
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#ifndef _ATTACH_
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#define _ATTACH_
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//
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// For each local file system volume on which there exists a local
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// DFS volume, a DFS volume device object is created, and attached
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// to the local file system volume device object via
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// IoAttachDeviceByPointer. This permits the DFS driver to
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// pre-screen any I/O which takes place on the local volume
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// and adjust it for DFS file I/O semantics.
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//
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// In many cases, the I/O can simply be passed through to the local
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// file system for handling. In some cases, parameters of the I/O
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// request must be examined and possibly modified before passing it
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// along to the underlying file system. In some cases, e.g., an attempt
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// to rename a directory along an exit path, the I/O request may be
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// returned with an error status.
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//
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//
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// The Volume device object is associated with every volume to which this
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// file system has been attached.
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//
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typedef struct _DFS_VOLUME_OBJECT {
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DEVICE_OBJECT DeviceObject; // simple device object.
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ULONG AttachCount; // count of attachments
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LIST_ENTRY VdoLinks; // links for DfsData.AVdoQueue
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PROVIDER_DEF Provider; // provider definition for passthrough
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PDEVICE_OBJECT RealDevice; // The bottommost device in
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// the chain of attached
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// devices.
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BOOLEAN DfsEnable; // Dfs Enabled or disable
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} DFS_VOLUME_OBJECT, *PDFS_VOLUME_OBJECT;
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//
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// The File System Attach device object is associated with every File
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// System Device Object that is available in the system
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//
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typedef struct _DFS_ATTACH_FILE_SYSTEM_OBJECT {
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DEVICE_OBJECT DeviceObject; // simple device object.
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LIST_ENTRY FsoLinks; // links for DfsData.AFsoQueue
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PDEVICE_OBJECT TargetDevice; // The one we are attached to
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} DFS_ATTACH_FILE_SYSTEM_OBJECT, *PDFS_ATTACH_FILE_SYSTEM_OBJECT;
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//
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// Public function prototypes in attach.c
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//
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NTSTATUS
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DfsGetAttachName(
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IN PUNICODE_STRING LocalVolumeStorageId,
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OUT PUNICODE_STRING LocalVolumeRelativeName
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);
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NTSTATUS
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DfsSetupVdo(
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IN PUNICODE_STRING RootName,
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IN PDEVICE_OBJECT ptargetVdo,
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IN PDEVICE_OBJECT realDevice,
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IN ULONG pVolNameLen,
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OUT PDFS_VOLUME_OBJECT *pdfsVdo);
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NTSTATUS
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DfsAttachVolume(
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IN PUNICODE_STRING RootName,
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OUT PPROVIDER_DEF *ppProvider
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);
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NTSTATUS
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DfsDetachVolume(
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IN PUNICODE_STRING TargetName
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);
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NTSTATUS
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DfsDetachVolumeForDelete(
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IN PDEVICE_OBJECT DfsVdo
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);
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VOID
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DfsReattachToMountedVolume(
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IN PDEVICE_OBJECT TargetDevice,
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IN PVPB Vpb
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);
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VOID
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DfsFsNotification(
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IN PDEVICE_OBJECT FileSystemObject,
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IN BOOLEAN fLoading
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);
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VOID
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DfsDetachAllFileSystems(
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VOID
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);
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NTSTATUS
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DfsVolumePassThrough(
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IN PDEVICE_OBJECT DeviceObject,
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IN PIRP Irp
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);
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NTSTATUS
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DfsCompleteVolumePassThrough(
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IN PDEVICE_OBJECT pDevice,
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IN PIRP Irp,
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IN PVOID Context
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);
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#endif // _ATTACH
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