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GetVolumeInformation function

Retrieves information about the file system and volume associated with the specified root directory.

To specify a handle when retrieving this information, use the GetVolumeInformationByHandleW function.

To retrieve the current compression state of a file or directory, use FSCTL_GET_COMPRESSION.

Syntax


BOOL WINAPI GetVolumeInformation(
  _In_opt_   LPCTSTR lpRootPathName,
  _Out_opt_  LPTSTR lpVolumeNameBuffer,
  _In_       DWORD nVolumeNameSize,
  _Out_opt_  LPDWORD lpVolumeSerialNumber,
  _Out_opt_  LPDWORD lpMaximumComponentLength,
  _Out_opt_  LPDWORD lpFileSystemFlags,
  _Out_opt_  LPTSTR lpFileSystemNameBuffer,
  _In_       DWORD nFileSystemNameSize
);

Parameters

lpRootPathName [in, optional]

A pointer to a string that contains the root directory of the volume to be described.

If this parameter is NULL, the root of the current directory is used. A trailing backslash is required. For example, you specify \\MyServer\MyShare as "\\MyServer\MyShare\", or the C drive as "C:\".

lpVolumeNameBuffer [out, optional]

A pointer to a buffer that receives the name of a specified volume. The buffer size is specified by the nVolumeNameSize parameter.

nVolumeNameSize [in]

The length of a volume name buffer, in TCHARs. The maximum buffer size is MAX_PATH+1.

This parameter is ignored if the volume name buffer is not supplied.

lpVolumeSerialNumber [out, optional]

A pointer to a variable that receives the volume serial number.

This parameter can be NULL if the serial number is not required.

This function returns the volume serial number that the operating system assigns when a hard disk is formatted. To programmatically obtain the hard disk's serial number that the manufacturer assigns, use the Windows Management Instrumentation (WMI) Win32_PhysicalMedia property SerialNumber.

lpMaximumComponentLength [out, optional]

A pointer to a variable that receives the maximum length, in TCHARs, of a file name component that a specified file system supports.

A file name component is the portion of a file name between backslashes.

The value that is stored in the variable that *lpMaximumComponentLength points to is used to indicate that a specified file system supports long names. For example, for a FAT file system that supports long names, the function stores the value 255, rather than the previous 8.3 indicator. Long names can also be supported on systems that use the NTFS file system.

lpFileSystemFlags [out, optional]

A pointer to a variable that receives flags associated with the specified file system.

This parameter can be one or more of the following flags. However, FS_FILE_COMPRESSION and FS_VOL_IS_COMPRESSED are mutually exclusive.

ValueMeaning
FILE_CASE_PRESERVED_NAMES
0x00000002

The specified volume supports preserved case of file names when it places a name on disk.

FILE_CASE_SENSITIVE_SEARCH
0x00000001

The specified volume supports case-sensitive file names.

FILE_FILE_COMPRESSION
0x00000010

The specified volume supports file-based compression.

FILE_NAMED_STREAMS
0x00040000

The specified volume supports named streams.

FILE_PERSISTENT_ACLS
0x00000008

The specified volume preserves and enforces access control lists (ACL). For example, the NTFS file system preserves and enforces ACLs, and the FAT file system does not.

FILE_READ_ONLY_VOLUME
0x00080000

The specified volume is read-only.

FILE_SEQUENTIAL_WRITE_ONCE
0x00100000

The specified volume supports a single sequential write.

FILE_SUPPORTS_ENCRYPTION
0x00020000

The specified volume supports the Encrypted File System (EFS). For more information, see File Encryption.

FILE_SUPPORTS_EXTENDED_ATTRIBUTES
0x00800000

The specified volume supports extended attributes. An extended attribute is a piece of application-specific metadata that an application can associate with a file and is not part of the file's data.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP:  This value is not supported until Windows Server 2008 R2 and Windows 7.

FILE_SUPPORTS_HARD_LINKS
0x00400000

The specified volume supports hard links. For more information, see Hard Links and Junctions.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP:  This value is not supported until Windows Server 2008 R2 and Windows 7.

FILE_SUPPORTS_OBJECT_IDS
0x00010000

The specified volume supports object identifiers.

FILE_SUPPORTS_OPEN_BY_FILE_ID
0x01000000

The file system supports open by FileID. For more information, see FILE_ID_BOTH_DIR_INFO.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP:  This value is not supported until Windows Server 2008 R2 and Windows 7.

FILE_SUPPORTS_REPARSE_POINTS
0x00000080

The specified volume supports reparse points.

ReFS:  ReFS supports reparse points but does not index them so FindFirstVolumeMountPoint and FindNextVolumeMountPoint will not function as expected.

FILE_SUPPORTS_SPARSE_FILES
0x00000040

The specified volume supports sparse files.

FILE_SUPPORTS_TRANSACTIONS
0x00200000

The specified volume supports transactions. For more information, see About KTM.

FILE_SUPPORTS_USN_JOURNAL
0x02000000

The specified volume supports update sequence number (USN) journals. For more information, see Change Journal Records.

Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP:  This value is not supported until Windows Server 2008 R2 and Windows 7.

FILE_UNICODE_ON_DISK
0x00000004

The specified volume supports Unicode in file names as they appear on disk.

FILE_VOLUME_IS_COMPRESSED
0x00008000

The specified volume is a compressed volume, for example, a DoubleSpace volume.

FILE_VOLUME_QUOTAS
0x00000020

The specified volume supports disk quotas.

 

lpFileSystemNameBuffer [out, optional]

A pointer to a buffer that receives the name of the file system, for example, the FAT file system or the NTFS file system. The buffer size is specified by the nFileSystemNameSize parameter.

nFileSystemNameSize [in]

The length of the file system name buffer, in TCHARs. The maximum buffer size is MAX_PATH+1.

This parameter is ignored if the file system name buffer is not supplied.

Return value

If all the requested information is retrieved, the return value is nonzero.

If not all the requested information is retrieved, the return value is zero. To get extended error information, call GetLastError.

Remarks

When a user attempts to get information about a floppy drive that does not have a floppy disk, or a CD-ROM drive that does not have a compact disc, the system displays a message box for the user to insert a floppy disk or a compact disc, respectively. To prevent the system from displaying this message box, call the SetErrorMode function with SEM_FAILCRITICALERRORS.

The FS_VOL_IS_COMPRESSED flag is the only indicator of volume-based compression. The file system name is not altered to indicate compression, for example, this flag is returned set on a DoubleSpace volume. When compression is volume-based, an entire volume is compressed or not compressed.

The FS_FILE_COMPRESSION flag indicates whether a file system supports file-based compression. When compression is file-based, individual files can be compressed or not compressed.

The FS_FILE_COMPRESSION and FS_VOL_IS_COMPRESSED flags are mutually exclusive. Both bits cannot be returned set.

The maximum component length value that is stored in lpMaximumComponentLength is the only indicator that a volume supports longer-than-normal FAT file system (or other file system) file names. The file system name is not altered to indicate support for long file names.

The GetCompressedFileSize function obtains the compressed size of a file. The GetFileAttributes function can determine whether an individual file is compressed.

Symbolic link behavior—

If the path points to a symbolic link, the function returns volume information for the target.

In Windows 8 and Windows Server 2012, this function is supported by the following technologies.

TechnologySupported

Server Message Block (SMB) 3.0 protocol

No

SMB 3.0 Transparent Failover (TFO)

No

SMB 3.0 with Scale-out File Shares (SO)

No

Cluster Shared Volume File System (CsvFS)

Yes

Resilient File System (ReFS)

Yes

 

SMB does not support volume management functions.

Transacted Operations

If the volume supports file system transactions, the function returns FILE_SUPPORTS_TRANSACTIONS in lpFileSystemFlags.

Requirements

Minimum supported client

Windows XP [desktop apps only]

Minimum supported server

Windows Server 2003 [desktop apps only]

Header

FileAPI.h (include Windows.h);
WinBase.h on Windows Server 2008 R2, Windows 7, Windows Server 2008, Windows Vista, Windows Server 2003, and Windows XP (include Windows.h)

Library

Kernel32.lib

DLL

Kernel32.dll

Unicode and ANSI names

GetVolumeInformationW (Unicode) and GetVolumeInformationA (ANSI)

See also

About KTM
File Encryption
GetCompressedFileSize
GetFileAttributes
GetVolumeInformationByHandleW
SetErrorMode
SetVolumeLabel
Volume Management Functions

 

 

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