Extensible Firmware Interface Specification
206 12/12/00 Version 1.02
10.2.12 EFI_FILE_SYSTEM_INFO
Summary
Provides a GUID and a data structure that can be used with EFI_FILE.GetInfo() to get
information about the system volume, and EFI_FILE.SetInfo() to set the system volume’s
volume label.
GUID
#define EFI_FILE_SYSTEM_INFO_ID \
{ 09576e93-6d3f-11d2-8e39-00a0c969723b }
Related Definitions
typedef struct {
UINT64 Size;
BOOLEAN ReadOnly;
UINT64 VolumeSize;
UINT64 FreeSpace;
UINT32 BlockSize;
CHAR16 VolumeLabel[];
} EFI_FILE_SYSTEM_INFO;
Parameters
Size Size of the EFI_FILE_SYSTEM_INFO structure, including the Null-
terminated Unicode VolumeLabel string.
ReadOnly TRUE if the volume only supports read access.
VolumeSize The number of bytes managed by the file system.
FreeSpace The number of available bytes for use by the file system.
BlockSize The nominal block size files are typically grown by.
VolumeLabel The Null-terminated string that is the volume’s label.
Description
The EFI_FILE_SYSTEM_INFO data structure is an information structure that can be obtained on
the root directory file handle. The root directory file handle is the file handle first obtained on the
initial call to the HandleProtocol() function to open the file system interface. All of the
fields are read-only except for VolumeLabel. The system volume’s VolumeLabel can be
created or modified by calling EFI_FILE.SetInfo() with an updated VolumeLabel field.