FSDMGR Functions

Article
11/18/2015

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4/8/2010

The following table shows the File System Disk Manager (FSDMGR) functions with a description of the purpose of each.

Function	Description
FSDMGR_AcquireFileLock	Helper function provided by FSDMGR to simplify the implementation of the MyFSD_LockFileEx function in an FSD.
FSDMGR_CachedRead	If the specified block is cached, this function copies data from the cache into a buffer. If the specified block is not cached, this function reads the data from the disk and copies it into a buffer along with the cache.
FSDMGR_CachedWrite	For a write-through cache, writes data to disk and to the cache. For a write-back cache, writes data only to the cache and allows the lazy-writer thread to commit the data to the disk.
FSDMGR_CacheIoControl	Sends a custom I/O control to the cache.
FSDMGR_CreateCache	Creates a new cache.
FSDMGR_CreateFileHandle	Called by an FSD to create a handle for a specified file.
FSDMGR_CreateSearchHandle	Creates search or find handles. It is called by an FSD.
FSDMGR_DeleteCache	Deletes the cache.
FSDMGR_DeregisterVolume	Unregisters a volume.
FSDMGR_DeviceHandleToHDSK	Converts a true device handle into an HDSK for use in subsequent calls to the FSDMGR helper functions.

FSDMGR_DiskIoControl	Called by an FSD to access DeviceIoControl functions exported by a block driver.
FSDMGR_EmptyLockContainer	Helper function provided by FSDMGR to free all blocked threads waiting to lock a specified file.
FSDMGR_FlushCache	Commits dirty blocks in the cache to the disk.
FSDMGR_GetDiskInfo	Called by an FSD to obtain disk information.
FSDMGR_GetRegistryFlag	Called by an FSD to read a flag, based on a value from the registry.
FSDMGR_GetRegistryString	Called by an FSD to read a string value from the registry.
FSDMGR_GetRegistryValue	Called by an FSD to read a numeric value from the registry.
FSDMGR_GetVolumeName	Obtains the name of a volume, given its handle.
FSDMGR_InstallFileLock	Is the Lock Manager implementation of LockFileEx.
FSDMGR_ReadDisk	Reads sectors from a disk.
FSDMGR_ReadDiskEx	Reads sectors from a disk into discontinuous buffers.
FSDMGR_RegisterVolume	Registers a volume on a disk.
FSDMGR_RemoveFileLock	Helper function provided by FSDMGR to simplify the implementation of the MyFSD_UnLockFileEx function in an FSD.
FSDMGR_RemoveFileLockEx	Unlocks the file specified by the handle.
FSDMGR_ResizeCache	Resizes a cache.
FSDMGR_SyncCache	Updates the cache by reading from the disk for each cache block while maintaining the mapping between a cache block and a disk block.
FSDMGR_TestFileLock	Authorizes read or write requests.
FSDMGR_TestFileLockEx	Authorizes read or write requests; includes ability to override the current file position.
FSDMGR_WriteDisk	Writes sectors to a disk.
FSDMGR_WriteDiskEx	Writes sectors to a disk from discontinuous buffers.

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