MyFSD_MountDisk

A version of this page is also available for

Windows Embedded CE 6.0 R3

4/8/2010

This function mounts the specified disk containing a file system of the type defined by a file system driver (FSD). This function is exported by an implementation of FSD and is called indirectly by Files System Disk Manager (FSDMGR).

Syntax

BOOL MyFSD_MountDisk( 
  HDSK hdsk
);

Parameters

• hdsk
  [in] Handle to the disk.

Return Value

TRUE indicates success. FALSE indicates failure.

Remarks

An FSD must be able to handle redundant calls to this function. It must determine from the media itself, not the value of hdsk,whether the disk is already mounted. This is required because the user media can have been removed or changed slots while the system was turned off. The value of hdsk has meaning only to FSDMGR functions, not to an FSD.

Use the FSDMGR_ReadDisk and the FSDMGR_WriteDisk functions for all I/O to the mounted disk.

A definition (.def) file for MyFSD.dll must export this function as FSD_MountDisk When determining how to load an FSD, Device.exe looks for FSD_MountDisk.

All FSD functions can be called on re-entry. Therefore, take this into account when developing an FSD.

FSDMGR is a DLL that manages all OS interaction with installable files systems. Each installable file system requires an FSD, which is a DLL that supports an installable file system. The name of the DLL for an FSD and the names of the functions it exports start with the name of the associated installable file system. For example, if the name of file system is MyFSD, its DLL is MyFSD.dll, and its exported functions are prefaced with MyFSD_*.

FSDMGR provides service functions to FSDs. The FSDMGR_RegisterVolume, the FSDMGR_CreateFileHandle, and the FSDMGR_CreateSearchHandle functions record a DWORD of volume-specific data that an FSD associates with a volume. This volume-specific data is passed as the first parameter of these three functions.

Applications that access an installable file system use standard Win32 functions. For example, when an application creates a folder on a device that contains an installable file system, it calls the CreateDirectory function. FSDMGR recognizes that the path is to a device containing an installable file system and calls the appropriate function, which in the case of the MyFSD file system is MyFSD_CreateDirectoryW. That is, the application calls CreateDirectory, causing FSDMGR to call **MyFSD_CreateDirectoryW.

Requirements

See Also

Reference

MyFSD Functions
CreateDirectory
FSD_MountDisk
FSDMGR_CreateFileHandle
FSDMGR_CreateSearchHandle
FSDMGR_ReadDisk
FSDMGR_RegisterVolume
FSDMGR_WriteDisk
MyFSD_CreateDirectoryW
MyFSD_UnmountDisk