MyFSD_CloseVolume (Compact 2013)

3/26/2014

This function closes a volume on a device that has an installable file system. This function is exported by an implementation of a file system driver (FSD) and is called indirectly by File System Disk Manager (FSDMGR).

Syntax

BOOL MyFSD_CloseVolume( 
  PVOLUME pVolume
);

Parameters

• pVolume
  [in] Pointer to the value that an FSD defines in its DLL and passes to the FSDMGR_RegisterVolume function when registering the volume. The definition of this parameter can point to private structures.

Return Value

Nonzero indicates success. Zero indicates failure. To get extended error information, call GetLastError.

Remarks

This function is a notification that the specified volume is being unregistered and is implemented in a user-defined file system.

An FSD does not need to export this function if it cleans up all associated resources before calling the FSDMGR_DeregisterVolume function.

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 an FSD associates with 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
FSDMGR_CreateSearchHandle
FSDMGR_DeregisterVolume
FSDMGR_RegisterVolume
MyFSD_CreateDirectoryW