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historical/m0-applesillicon.git/xnu-qemu-arm64-5.1.0/roms/edk2/FatPkg/EnhancedFatDxe/Fat.h

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phht hahahahaah
2024-01-16 11:20:27 -06:00
/** @file
Main header file for EFI FAT file system driver.
Copyright (c) 2005 - 2013, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _FAT_H_
#define _FAT_H_
#include <Uefi.h>
#include <Guid/FileInfo.h>
#include <Guid/FileSystemInfo.h>
#include <Guid/FileSystemVolumeLabelInfo.h>
#include <Protocol/BlockIo.h>
#include <Protocol/DiskIo.h>
#include <Protocol/DiskIo2.h>
#include <Protocol/SimpleFileSystem.h>
#include <Protocol/UnicodeCollation.h>
#include <Library/PcdLib.h>
#include <Library/DebugLib.h>
#include <Library/UefiLib.h>
#include <Library/BaseLib.h>
#include <Library/BaseMemoryLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiDriverEntryPoint.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiRuntimeServicesTableLib.h>
#include "FatFileSystem.h"
//
// The FAT signature
//
#define FAT_VOLUME_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'v')
#define FAT_IFILE_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'i')
#define FAT_ODIR_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'd')
#define FAT_DIRENT_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'e')
#define FAT_OFILE_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'o')
#define FAT_TASK_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'T')
#define FAT_SUBTASK_SIGNATURE SIGNATURE_32 ('f', 'a', 't', 'S')
#define ASSERT_VOLUME_LOCKED(a) ASSERT_LOCKED (&FatFsLock)
#define IFILE_FROM_FHAND(a) CR (a, FAT_IFILE, Handle, FAT_IFILE_SIGNATURE)
#define DIRENT_FROM_LINK(a) CR (a, FAT_DIRENT, Link, FAT_DIRENT_SIGNATURE)
#define VOLUME_FROM_ROOT_DIRENT(a) CR (a, FAT_VOLUME, RootDirEnt, FAT_VOLUME_SIGNATURE)
#define VOLUME_FROM_VOL_INTERFACE(a) CR (a, FAT_VOLUME, VolumeInterface, FAT_VOLUME_SIGNATURE);
#define ODIR_FROM_DIRCACHELINK(a) CR (a, FAT_ODIR, DirCacheLink, FAT_ODIR_SIGNATURE)
#define OFILE_FROM_CHECKLINK(a) CR (a, FAT_OFILE, CheckLink, FAT_OFILE_SIGNATURE)
#define OFILE_FROM_CHILDLINK(a) CR (a, FAT_OFILE, ChildLink, FAT_OFILE_SIGNATURE)
//
// Minimum sector size is 512B, Maximum sector size is 4096B
// Max sectors per cluster is 128
//
#define MAX_BLOCK_ALIGNMENT 12
#define MIN_BLOCK_ALIGNMENT 9
#define MAX_SECTORS_PER_CLUSTER_ALIGNMENT 7
//
// Efi Time Definition
//
#define IS_LEAP_YEAR(a) (((a) % 4 == 0) && (((a) % 100 != 0) || ((a) % 400 == 0)))
//
// Minimum fat page size is 8K, maximum fat page alignment is 32K
// Minimum data page size is 8K, maximum fat page alignment is 64K
//
#define FAT_FATCACHE_PAGE_MIN_ALIGNMENT 13
#define FAT_FATCACHE_PAGE_MAX_ALIGNMENT 15
#define FAT_DATACACHE_PAGE_MIN_ALIGNMENT 13
#define FAT_DATACACHE_PAGE_MAX_ALIGNMENT 16
#define FAT_DATACACHE_GROUP_COUNT 64
#define FAT_FATCACHE_GROUP_MIN_COUNT 1
#define FAT_FATCACHE_GROUP_MAX_COUNT 16
//
// Used in 8.3 generation algorithm
//
#define MAX_SPEC_RETRY 4
#define SPEC_BASE_TAG_LEN 6
#define HASH_BASE_TAG_LEN 2
#define HASH_VALUE_TAG_LEN (SPEC_BASE_TAG_LEN - HASH_BASE_TAG_LEN)
//
// Path name separator is back slash
//
#define PATH_NAME_SEPARATOR L'\\'
#define EFI_PATH_STRING_LENGTH 260
#define EFI_FILE_STRING_LENGTH 255
#define FAT_MAX_ALLOCATE_SIZE 0xA00000
#define LC_ISO_639_2_ENTRY_SIZE 3
#define MAX_LANG_CODE_SIZE 100
#define FAT_MAX_DIR_CACHE_COUNT 8
#define FAT_MAX_DIRENTRY_COUNT 0xFFFF
typedef CHAR8 LC_ISO_639_2;
//
// The fat types we support
//
typedef enum {
Fat12,
Fat16,
Fat32,
FatUndefined
} FAT_VOLUME_TYPE;
typedef enum {
CacheFat,
CacheData,
CacheMaxType
} CACHE_DATA_TYPE;
//
// Used in FatDiskIo
//
typedef enum {
ReadDisk = 0, // raw disk read
WriteDisk = 1, // raw disk write
ReadFat = 2, // read fat cache
WriteFat = 3, // write fat cache
ReadData = 6, // read data cache
WriteData = 7 // write data cache
} IO_MODE;
#define CACHE_ENABLED(a) ((a) >= 2)
#define RAW_ACCESS(a) ((IO_MODE)((a) & 0x1))
#define CACHE_TYPE(a) ((CACHE_DATA_TYPE)((a) >> 2))
//
// Disk cache tag
//
typedef struct {
UINTN PageNo;
UINTN RealSize;
BOOLEAN Dirty;
} CACHE_TAG;
typedef struct {
UINT64 BaseAddress;
UINT64 LimitAddress;
UINT8 *CacheBase;
BOOLEAN Dirty;
UINT8 PageAlignment;
UINTN GroupMask;
CACHE_TAG CacheTag[FAT_DATACACHE_GROUP_COUNT];
} DISK_CACHE;
//
// Hash table size
//
#define HASH_TABLE_SIZE 0x400
#define HASH_TABLE_MASK (HASH_TABLE_SIZE - 1)
//
// The directory entry for opened directory
//
typedef struct _FAT_DIRENT FAT_DIRENT;
typedef struct _FAT_ODIR FAT_ODIR;
typedef struct _FAT_OFILE FAT_OFILE;
typedef struct _FAT_VOLUME FAT_VOLUME;
struct _FAT_DIRENT {
UINTN Signature;
UINT16 EntryPos; // The position of this directory entry in the parent directory file
UINT8 EntryCount; // The count of the directory entry in the parent directory file
BOOLEAN Invalid; // Indicate whether this directory entry is valid
CHAR16 *FileString; // The unicode long file name for this directory entry
FAT_OFILE *OFile; // The OFile of the corresponding directory entry
FAT_DIRENT *ShortNameForwardLink; // Hash successor link for short filename
FAT_DIRENT *LongNameForwardLink; // Hash successor link for long filename
LIST_ENTRY Link; // Connection of every directory entry
FAT_DIRECTORY_ENTRY Entry; // The physical directory entry stored in disk
};
struct _FAT_ODIR {
UINTN Signature;
UINT32 CurrentEndPos; // Current end position of the directory
UINT32 CurrentPos; // Current position of the directory
LIST_ENTRY *CurrentCursor; // Current directory entry pointer
LIST_ENTRY ChildList; // List of all directory entries
BOOLEAN EndOfDir; // Indicate whether we have reached the end of the directory
LIST_ENTRY DirCacheLink; // Linked in Volume->DirCacheList when discarded
UINTN DirCacheTag; // The identification of the directory when in directory cache
FAT_DIRENT *LongNameHashTable[HASH_TABLE_SIZE];
FAT_DIRENT *ShortNameHashTable[HASH_TABLE_SIZE];
};
typedef struct {
UINTN Signature;
EFI_FILE_PROTOCOL Handle;
UINT64 Position;
BOOLEAN ReadOnly;
FAT_OFILE *OFile;
LIST_ENTRY Tasks; // List of all FAT_TASKs
LIST_ENTRY Link; // Link to other IFiles
} FAT_IFILE;
typedef struct {
UINTN Signature;
EFI_FILE_IO_TOKEN *FileIoToken;
FAT_IFILE *IFile;
LIST_ENTRY Subtasks; // List of all FAT_SUBTASKs
LIST_ENTRY Link; // Link to other FAT_TASKs
} FAT_TASK;
typedef struct {
UINTN Signature;
EFI_DISK_IO2_TOKEN DiskIo2Token;
FAT_TASK *Task;
BOOLEAN Write;
UINT64 Offset;
VOID *Buffer;
UINTN BufferSize;
LIST_ENTRY Link;
} FAT_SUBTASK;
//
// FAT_OFILE - Each opened file
//
struct _FAT_OFILE {
UINTN Signature;
FAT_VOLUME *Volume;
//
// A permanant error code to return to all accesses to
// this opened file
//
EFI_STATUS Error;
//
// A list of the IFILE instances for this OFile
//
LIST_ENTRY Opens;
//
// The dynamic infomation
//
UINTN FileSize;
UINTN FileCluster;
UINTN FileCurrentCluster;
UINTN FileLastCluster;
//
// Dirty is set if there have been any updates to the
// file
// Archive is set if the archive attribute in the file's
// directory entry needs to be set when performing flush
// PreserveLastMod is set if the last modification of the
// file is specified by SetInfo API
//
BOOLEAN Dirty;
BOOLEAN IsFixedRootDir;
BOOLEAN PreserveLastModification;
BOOLEAN Archive;
//
// Set by an OFile SetPosition
//
UINTN Position; // within file
UINT64 PosDisk; // on the disk
UINTN PosRem; // remaining in this disk run
//
// The opened parent, full path length and currently opened child files
//
FAT_OFILE *Parent;
UINTN FullPathLen;
LIST_ENTRY ChildHead;
LIST_ENTRY ChildLink;
//
// The opened directory structure for a directory; if this
// OFile represents a file, then ODir = NULL
//
FAT_ODIR *ODir;
//
// The directory entry for the Ofile
//
FAT_DIRENT *DirEnt;
//
// Link in Volume's reference list
//
LIST_ENTRY CheckLink;
};
struct _FAT_VOLUME {
UINTN Signature;
EFI_HANDLE Handle;
BOOLEAN Valid;
BOOLEAN DiskError;
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL VolumeInterface;
//
// If opened, the parent handle and BlockIo interface
//
EFI_BLOCK_IO_PROTOCOL *BlockIo;
EFI_DISK_IO_PROTOCOL *DiskIo;
EFI_DISK_IO2_PROTOCOL *DiskIo2;
UINT32 MediaId;
BOOLEAN ReadOnly;
//
// Computed values from fat bpb info
//
UINT64 VolumeSize;
UINT64 FatPos; // Disk pos of fat tables
UINT64 RootPos; // Disk pos of root directory
UINT64 FirstClusterPos; // Disk pos of first cluster
UINTN FatSize; // Number of bytes in each fat
UINTN MaxCluster; // Max cluster number
UINTN ClusterSize; // Cluster size of fat partition
UINT8 ClusterAlignment; // Equal to log_2 (clustersize);
FAT_VOLUME_TYPE FatType;
//
// Current part of fat table that's present
//
UINT64 FatEntryPos; // Location of buffer
UINTN FatEntrySize; // Size of buffer
UINT32 FatEntryBuffer; // The buffer
FAT_INFO_SECTOR FatInfoSector; // Free cluster info
UINTN FreeInfoPos; // Pos with the free cluster info
BOOLEAN FreeInfoValid; // If free cluster info is valid
//
// Unpacked Fat BPB info
//
UINTN NumFats;
UINTN RootEntries; // < FAT32, root dir is fixed size
UINTN RootCluster; // >= FAT32, root cluster chain head
//
// info for marking the volume dirty or not
//
BOOLEAN FatDirty; // If fat-entries have been updated
UINT32 DirtyValue;
UINT32 NotDirtyValue;
//
// The root directory entry and opened root file
//
FAT_DIRENT RootDirEnt;
//
// File Name of root OFile, it is empty string
//
CHAR16 RootFileString[1];
FAT_OFILE *Root;
//
// New OFiles are added to this list so they
// can be cleaned up if they aren't referenced.
//
LIST_ENTRY CheckRef;
//
// Directory cache List
//
LIST_ENTRY DirCacheList;
UINTN DirCacheCount;
//
// Disk Cache for this volume
//
VOID *CacheBuffer;
DISK_CACHE DiskCache[CacheMaxType];
};
//
// Function Prototypes
//
/**
Implements Open() of Simple File System Protocol.
@param FHand - File handle of the file serves as a starting reference point.
@param NewHandle - Handle of the file that is newly opened.
@param FileName - File name relative to FHand.
@param OpenMode - Open mode.
@param Attributes - Attributes to set if the file is created.
@retval EFI_INVALID_PARAMETER - The FileName is NULL or the file string is empty.
The OpenMode is not supported.
The Attributes is not the valid attributes.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory for file string.
@retval EFI_SUCCESS - Open the file successfully.
@return Others - The status of open file.
**/
EFI_STATUS
EFIAPI
FatOpen (
IN EFI_FILE_PROTOCOL *FHand,
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes
)
;
/**
Implements OpenEx() of Simple File System Protocol.
@param FHand - File handle of the file serves as a starting reference point.
@param NewHandle - Handle of the file that is newly opened.
@param FileName - File name relative to FHand.
@param OpenMode - Open mode.
@param Attributes - Attributes to set if the file is created.
@param Token - A pointer to the token associated with the transaction.
@retval EFI_INVALID_PARAMETER - The FileName is NULL or the file string is empty.
The OpenMode is not supported.
The Attributes is not the valid attributes.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory for file string.
@retval EFI_SUCCESS - Open the file successfully.
@return Others - The status of open file.
**/
EFI_STATUS
EFIAPI
FatOpenEx (
IN EFI_FILE_PROTOCOL *FHand,
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes,
IN OUT EFI_FILE_IO_TOKEN *Token
)
;
/**
Get the file's position of the file
@param FHand - The handle of file.
@param Position - The file's position of the file.
@retval EFI_SUCCESS - Get the info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
@retval EFI_UNSUPPORTED - The open file is not a file.
**/
EFI_STATUS
EFIAPI
FatGetPosition (
IN EFI_FILE_PROTOCOL *FHand,
OUT UINT64 *Position
)
;
/**
Get the some types info of the file into Buffer
@param FHand - The handle of file.
@param Type - The type of the info.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing volume info.
@retval EFI_SUCCESS - Get the info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
**/
EFI_STATUS
EFIAPI
FatGetInfo (
IN EFI_FILE_PROTOCOL *FHand,
IN EFI_GUID *Type,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
;
/**
Set the some types info of the file into Buffer.
@param FHand - The handle of file.
@param Type - The type of the info.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing volume info.
@retval EFI_SUCCESS - Set the info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
**/
EFI_STATUS
EFIAPI
FatSetInfo (
IN EFI_FILE_PROTOCOL *FHand,
IN EFI_GUID *Type,
IN UINTN BufferSize,
IN VOID *Buffer
)
;
/**
Flushes all data associated with the file handle.
@param FHand - Handle to file to flush
@retval EFI_SUCCESS - Flushed the file successfully
@retval EFI_WRITE_PROTECTED - The volume is read only
@retval EFI_ACCESS_DENIED - The volume is not read only
but the file is read only
@return Others - Flushing of the file is failed
**/
EFI_STATUS
EFIAPI
FatFlush (
IN EFI_FILE_PROTOCOL *FHand
)
;
/**
Flushes all data associated with the file handle.
@param FHand - Handle to file to flush.
@param Token - A pointer to the token associated with the transaction.
@retval EFI_SUCCESS - Flushed the file successfully.
@retval EFI_WRITE_PROTECTED - The volume is read only.
@retval EFI_ACCESS_DENIED - The file is read only.
@return Others - Flushing of the file failed.
**/
EFI_STATUS
EFIAPI
FatFlushEx (
IN EFI_FILE_PROTOCOL *FHand,
IN EFI_FILE_IO_TOKEN *Token
)
;
/**
Flushes & Closes the file handle.
@param FHand - Handle to the file to delete.
@retval EFI_SUCCESS - Closed the file successfully.
**/
EFI_STATUS
EFIAPI
FatClose (
IN EFI_FILE_PROTOCOL *FHand
)
;
/**
Deletes the file & Closes the file handle.
@param FHand - Handle to the file to delete.
@retval EFI_SUCCESS - Delete the file successfully.
@retval EFI_WARN_DELETE_FAILURE - Fail to delete the file.
**/
EFI_STATUS
EFIAPI
FatDelete (
IN EFI_FILE_PROTOCOL *FHand
)
;
/**
Set the file's position of the file.
@param FHand - The handle of file
@param Position - The file's position of the file
@retval EFI_SUCCESS - Set the info successfully
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file
@retval EFI_UNSUPPORTED - Set a directory with a not-zero position
**/
EFI_STATUS
EFIAPI
FatSetPosition (
IN EFI_FILE_PROTOCOL *FHand,
IN UINT64 Position
)
;
/**
Get the file info.
@param FHand - The handle of the file.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing read data.
@retval EFI_SUCCESS - Get the file info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
@retval EFI_VOLUME_CORRUPTED - The file type of open file is error.
@return other - An error occurred when operation the disk.
**/
EFI_STATUS
EFIAPI
FatRead (
IN EFI_FILE_PROTOCOL *FHand,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
;
/**
Get the file info.
@param FHand - The handle of the file.
@param Token - A pointer to the token associated with the transaction.
@retval EFI_SUCCESS - Get the file info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
@retval EFI_VOLUME_CORRUPTED - The file type of open file is error.
@return other - An error occurred when operation the disk.
**/
EFI_STATUS
EFIAPI
FatReadEx (
IN EFI_FILE_PROTOCOL *FHand,
IN OUT EFI_FILE_IO_TOKEN *Token
)
;
/**
Set the file info.
@param FHand - The handle of the file.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing write data.
@retval EFI_SUCCESS - Set the file info successfully.
@retval EFI_WRITE_PROTECTED - The disk is write protected.
@retval EFI_ACCESS_DENIED - The file is read-only.
@retval EFI_DEVICE_ERROR - The OFile is not valid.
@retval EFI_UNSUPPORTED - The open file is not a file.
- The writing file size is larger than 4GB.
@return other - An error occurred when operation the disk.
**/
EFI_STATUS
EFIAPI
FatWrite (
IN EFI_FILE_PROTOCOL *FHand,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
)
;
/**
Get the file info.
@param FHand - The handle of the file.
@param Token - A pointer to the token associated with the transaction.
@retval EFI_SUCCESS - Get the file info successfully.
@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
@retval EFI_VOLUME_CORRUPTED - The file type of open file is error.
@return other - An error occurred when operation the disk.
**/
EFI_STATUS
EFIAPI
FatWriteEx (
IN EFI_FILE_PROTOCOL *FHand,
IN OUT EFI_FILE_IO_TOKEN *Token
)
;
//
// DiskCache.c
//
/**
Initialize the disk cache according to Volume's FatType.
@param Volume - FAT file system volume.
@retval EFI_SUCCESS - The disk cache is successfully initialized.
@retval EFI_OUT_OF_RESOURCES - Not enough memory to allocate disk cache.
**/
EFI_STATUS
FatInitializeDiskCache (
IN FAT_VOLUME *Volume
);
/**
Read BufferSize bytes from the position of Offset into Buffer,
or write BufferSize bytes from Buffer into the position of Offset.
Base on the parameter of CACHE_DATA_TYPE, the data access will be divided into
the access of FAT cache (CACHE_FAT) and the access of Data cache (CACHE_DATA):
1. Access of FAT cache (CACHE_FAT): Access the data in the FAT cache, if there is cache
page hit, just return the cache page; else update the related cache page and return
the right cache page.
2. Access of Data cache (CACHE_DATA):
The access data will be divided into UnderRun data, Aligned data and OverRun data;
The UnderRun data and OverRun data will be accessed by the Data cache,
but the Aligned data will be accessed with disk directly.
@param Volume - FAT file system volume.
@param CacheDataType - The type of cache: CACHE_DATA or CACHE_FAT.
@param IoMode - Indicate the type of disk access.
@param Offset - The starting byte offset to read from.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing cache data.
@param Task point to task instance.
@retval EFI_SUCCESS - The data was accessed correctly.
@retval EFI_MEDIA_CHANGED - The MediaId does not match the current device.
@return Others - An error occurred when accessing cache.
**/
EFI_STATUS
FatAccessCache (
IN FAT_VOLUME *Volume,
IN CACHE_DATA_TYPE CacheDataType,
IN IO_MODE IoMode,
IN UINT64 Offset,
IN UINTN BufferSize,
IN OUT UINT8 *Buffer,
IN FAT_TASK *Task
);
/**
Flush all the dirty cache back, include the FAT cache and the Data cache.
@param Volume - FAT file system volume.
@param Task point to task instance.
@retval EFI_SUCCESS - Flush all the dirty cache back successfully
@return other - An error occurred when writing the data into the disk
**/
EFI_STATUS
FatVolumeFlushCache (
IN FAT_VOLUME *Volume,
IN FAT_TASK *Task
);
//
// Flush.c
//
/**
Flush the data associated with an open file.
In this implementation, only last Mod/Access time is updated.
@param OFile - The open file.
@retval EFI_SUCCESS - The OFile is flushed successfully.
@return Others - An error occurred when flushing this OFile.
**/
EFI_STATUS
FatOFileFlush (
IN FAT_OFILE *OFile
);
/**
Check the references of the OFile.
If the OFile (that is checked) is no longer
referenced, then it is freed.
@param OFile - The OFile to be checked.
@retval TRUE - The OFile is not referenced and freed.
@retval FALSE - The OFile is kept.
**/
BOOLEAN
FatCheckOFileRef (
IN FAT_OFILE *OFile
);
/**
Set the OFile and its child OFile with the error Status
@param OFile - The OFile whose permanent error code is to be set.
@param Status - Error code to be set.
**/
VOID
FatSetVolumeError (
IN FAT_OFILE *OFile,
IN EFI_STATUS Status
);
/**
Close the open file instance.
@param IFile - Open file instance.
@retval EFI_SUCCESS - Closed the file successfully.
**/
EFI_STATUS
FatIFileClose (
FAT_IFILE *IFile
);
/**
Set error status for a specific OFile, reference checking the volume.
If volume is already marked as invalid, and all resources are freed
after reference checking, the file system protocol is uninstalled and
the volume structure is freed.
@param Volume - the Volume that is to be reference checked and unlocked.
@param OFile - the OFile whose permanent error code is to be set.
@param EfiStatus - error code to be set.
@param Task point to task instance.
@retval EFI_SUCCESS - Clean up the volume successfully.
@return Others - Cleaning up of the volume is failed.
**/
EFI_STATUS
FatCleanupVolume (
IN FAT_VOLUME *Volume,
IN FAT_OFILE *OFile,
IN EFI_STATUS EfiStatus,
IN FAT_TASK *Task
);
//
// FileSpace.c
//
/**
Shrink the end of the open file base on the file size.
@param OFile - The open file.
@retval EFI_SUCCESS - Shrinked sucessfully.
@retval EFI_VOLUME_CORRUPTED - There are errors in the file's clusters.
**/
EFI_STATUS
FatShrinkEof (
IN FAT_OFILE *OFile
);
/**
Grow the end of the open file base on the NewSizeInBytes.
@param OFile - The open file.
@param NewSizeInBytes - The new size in bytes of the open file.
@retval EFI_SUCCESS - The file is grown sucessfully.
@retval EFI_UNSUPPORTED - The file size is larger than 4GB.
@retval EFI_VOLUME_CORRUPTED - There are errors in the files' clusters.
@retval EFI_VOLUME_FULL - The volume is full and can not grow the file.
**/
EFI_STATUS
FatGrowEof (
IN FAT_OFILE *OFile,
IN UINT64 NewSizeInBytes
);
/**
Get the size of directory of the open file.
@param Volume - The File System Volume.
@param Cluster - The Starting cluster.
@return The physical size of the file starting at the input cluster, if there is error in the
cluster chain, the return value is 0.
**/
UINTN
FatPhysicalDirSize (
IN FAT_VOLUME *Volume,
IN UINTN Cluster
);
/**
Get the physical size of a file on the disk.
@param Volume - The file system volume.
@param RealSize - The real size of a file.
@return The physical size of a file on the disk.
**/
UINT64
FatPhysicalFileSize (
IN FAT_VOLUME *Volume,
IN UINTN RealSize
);
/**
Seek OFile to requested position, and calculate the number of
consecutive clusters from the position in the file
@param OFile - The open file.
@param Position - The file's position which will be accessed.
@param PosLimit - The maximum length current reading/writing may access
@retval EFI_SUCCESS - Set the info successfully.
@retval EFI_VOLUME_CORRUPTED - Cluster chain corrupt.
**/
EFI_STATUS
FatOFilePosition (
IN FAT_OFILE *OFile,
IN UINTN Position,
IN UINTN PosLimit
);
/**
Update the free cluster info of FatInfoSector of the volume.
@param Volume - FAT file system volume.
**/
VOID
FatComputeFreeInfo (
IN FAT_VOLUME *Volume
);
//
// Init.c
//
/**
Allocates volume structure, detects FAT file system, installs protocol,
and initialize cache.
@param Handle - The handle of parent device.
@param DiskIo - The DiskIo of parent device.
@param DiskIo2 - The DiskIo2 of parent device.
@param BlockIo - The BlockIo of parent devicel
@retval EFI_SUCCESS - Allocate a new volume successfully.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory.
@return Others - Allocating a new volume failed.
**/
EFI_STATUS
FatAllocateVolume (
IN EFI_HANDLE Handle,
IN EFI_DISK_IO_PROTOCOL *DiskIo,
IN EFI_DISK_IO2_PROTOCOL *DiskIo2,
IN EFI_BLOCK_IO_PROTOCOL *BlockIo
);
/**
Detects FAT file system on Disk and set relevant fields of Volume.
@param Volume - The volume structure.
@retval EFI_SUCCESS - The Fat File System is detected successfully
@retval EFI_UNSUPPORTED - The volume is not FAT file system.
@retval EFI_VOLUME_CORRUPTED - The volume is corrupted.
**/
EFI_STATUS
FatOpenDevice (
IN OUT FAT_VOLUME *Volume
);
/**
Called by FatDriverBindingStop(), Abandon the volume.
@param Volume - The volume to be abandoned.
@retval EFI_SUCCESS - Abandoned the volume successfully.
@return Others - Can not uninstall the protocol interfaces.
**/
EFI_STATUS
FatAbandonVolume (
IN FAT_VOLUME *Volume
);
//
// Misc.c
//
/**
Create the task
@param IFile - The instance of the open file.
@param Token - A pointer to the token associated with the transaction.
@return FAT_TASK * - Return the task instance.
**/
FAT_TASK *
FatCreateTask (
FAT_IFILE *IFile,
EFI_FILE_IO_TOKEN *Token
);
/**
Destroy the task.
@param Task - The task to be destroyed.
**/
VOID
FatDestroyTask (
FAT_TASK *Task
);
/**
Wait all non-blocking requests complete.
@param IFile - The instance of the open file.
**/
VOID
FatWaitNonblockingTask (
FAT_IFILE *IFile
);
/**
Remove the subtask from subtask list.
@param Subtask - The subtask to be removed.
@return LIST_ENTRY * - The next node in the list.
**/
LIST_ENTRY *
FatDestroySubtask (
FAT_SUBTASK *Subtask
);
/**
Execute the task.
@param IFile - The instance of the open file.
@param Task - The task to be executed.
@retval EFI_SUCCESS - The task was executed sucessfully.
@return other - An error occurred when executing the task.
**/
EFI_STATUS
FatQueueTask (
IN FAT_IFILE *IFile,
IN FAT_TASK *Task
);
/**
Set the volume as dirty or not.
@param Volume - FAT file system volume.
@param IoMode - The access mode.
@param DirtyValue - Set the volume as dirty or not.
@retval EFI_SUCCESS - Set the new FAT entry value sucessfully.
@return other - An error occurred when operation the FAT entries.
**/
EFI_STATUS
FatAccessVolumeDirty (
IN FAT_VOLUME *Volume,
IN IO_MODE IoMode,
IN VOID *DirtyValue
);
/**
General disk access function.
@param Volume - FAT file system volume.
@param IoMode - The access mode (disk read/write or cache access).
@param Offset - The starting byte offset to read from.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing read data.
@param Task point to task instance.
@retval EFI_SUCCESS - The operation is performed successfully.
@retval EFI_VOLUME_CORRUPTED - The accesss is
@return Others - The status of read/write the disk
**/
EFI_STATUS
FatDiskIo (
IN FAT_VOLUME *Volume,
IN IO_MODE IoMode,
IN UINT64 Offset,
IN UINTN BufferSize,
IN OUT VOID *Buffer,
IN FAT_TASK *Task
);
/**
Lock the volume.
**/
VOID
FatAcquireLock (
VOID
);
/**
Unlock the volume.
**/
VOID
FatReleaseLock (
VOID
);
/**
Lock the volume.
If the lock is already in the acquired state, then EFI_ACCESS_DENIED is returned.
Otherwise, EFI_SUCCESS is returned.
@retval EFI_SUCCESS - The volume is locked.
@retval EFI_ACCESS_DENIED - The volume could not be locked because it is already locked.
**/
EFI_STATUS
FatAcquireLockOrFail (
VOID
);
/**
Free directory entry.
@param DirEnt - The directory entry to be freed.
**/
VOID
FatFreeDirEnt (
IN FAT_DIRENT *DirEnt
);
/**
Free volume structure (including the contents of directory cache and disk cache).
@param Volume - The volume structure to be freed.
**/
VOID
FatFreeVolume (
IN FAT_VOLUME *Volume
);
/**
Translate EFI time to FAT time.
@param ETime - The time of EFI_TIME.
@param FTime - The time of FAT_DATE_TIME.
**/
VOID
FatEfiTimeToFatTime (
IN EFI_TIME *ETime,
OUT FAT_DATE_TIME *FTime
);
/**
Translate Fat time to EFI time.
@param FTime - The time of FAT_DATE_TIME.
@param ETime - The time of EFI_TIME..
**/
VOID
FatFatTimeToEfiTime (
IN FAT_DATE_TIME *FTime,
OUT EFI_TIME *ETime
);
/**
Get Current FAT time.
@param FatTime - Current FAT time.
**/
VOID
FatGetCurrentFatTime (
OUT FAT_DATE_TIME *FatTime
);
/**
Check whether a time is valid.
@param Time - The time of EFI_TIME.
@retval TRUE - The time is valid.
@retval FALSE - The time is not valid.
**/
BOOLEAN
FatIsValidTime (
IN EFI_TIME *Time
);
//
// UnicodeCollation.c
//
/**
Initialize Unicode Collation support.
It tries to locate Unicode Collation 2 protocol and matches it with current
platform language code. If for any reason the first attempt fails, it then tries to
use Unicode Collation Protocol.
@param AgentHandle The handle used to open Unicode Collation (2) protocol.
@retval EFI_SUCCESS The Unicode Collation (2) protocol has been successfully located.
@retval Others The Unicode Collation (2) protocol has not been located.
**/
EFI_STATUS
InitializeUnicodeCollationSupport (
IN EFI_HANDLE AgentHandle
);
/**
Convert FAT string to unicode string.
@param FatSize The size of FAT string.
@param Fat The FAT string.
@param String The unicode string.
@return None.
**/
VOID
FatFatToStr (
IN UINTN FatSize,
IN CHAR8 *Fat,
OUT CHAR16 *String
);
/**
Convert unicode string to Fat string.
@param String The unicode string.
@param FatSize The size of the FAT string.
@param Fat The FAT string.
@retval TRUE Convert successfully.
@retval FALSE Convert error.
**/
BOOLEAN
FatStrToFat (
IN CHAR16 *String,
IN UINTN FatSize,
OUT CHAR8 *Fat
);
/**
Lowercase a string
@param Str The string which will be lower-cased.
**/
VOID
FatStrLwr (
IN CHAR16 *Str
);
/**
Uppercase a string.
@param Str The string which will be upper-cased.
**/
VOID
FatStrUpr (
IN CHAR16 *Str
);
/**
Performs a case-insensitive comparison of two Null-terminated Unicode strings.
@param Str1 A pointer to a Null-terminated Unicode string.
@param Str2 A pointer to a Null-terminated Unicode string.
@retval 0 S1 is equivalent to S2.
@retval >0 S1 is lexically greater than S2.
@retval <0 S1 is lexically less than S2.
**/
INTN
FatStriCmp (
IN CHAR16 *Str1,
IN CHAR16 *Str2
);
//
// Open.c
//
/**
Open a file for a file name relative to an existing OFile.
The IFile of the newly opened file is passed out.
@param OFile - The file that serves as a starting reference point.
@param NewIFile - The newly generated IFile instance.
@param FileName - The file name relative to the OFile.
@param OpenMode - Open mode.
@param Attributes - Attributes to set if the file is created.
@retval EFI_SUCCESS - Open the file successfully.
@retval EFI_INVALID_PARAMETER - The open mode is conflict with the attributes
or the file name is not valid.
@retval EFI_NOT_FOUND - Conficts between dir intention and attribute.
@retval EFI_WRITE_PROTECTED - Can't open for write if the volume is read only.
@retval EFI_ACCESS_DENIED - If the file's attribute is read only, and the
open is for read-write fail it.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory.
**/
EFI_STATUS
FatOFileOpen (
IN FAT_OFILE *OFile,
OUT FAT_IFILE **NewIFile,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT8 Attributes
);
/**
Create an Open instance for the existing OFile.
The IFile of the newly opened file is passed out.
@param OFile - The file that serves as a starting reference point.
@param PtrIFile - The newly generated IFile instance.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory for the IFile
@retval EFI_SUCCESS - Create the new IFile for the OFile successfully
**/
EFI_STATUS
FatAllocateIFile (
IN FAT_OFILE *OFile,
OUT FAT_IFILE **PtrIFile
);
//
// OpenVolume.c
//
/**
Implements Simple File System Protocol interface function OpenVolume().
@param This - Calling context.
@param File - the Root Directory of the volume.
@retval EFI_OUT_OF_RESOURCES - Can not allocate the memory.
@retval EFI_VOLUME_CORRUPTED - The FAT type is error.
@retval EFI_SUCCESS - Open the volume successfully.
**/
EFI_STATUS
EFIAPI
FatOpenVolume (
IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **File
);
//
// ReadWrite.c
//
/**
This function reads data from a file or writes data to a file.
It uses OFile->PosRem to determine how much data can be accessed in one time.
@param OFile - The open file.
@param IoMode - Indicate whether the access mode is reading or writing.
@param Position - The position where data will be accessed.
@param DataBufferSize - Size of Buffer.
@param UserBuffer - Buffer containing data.
@param Task point to task instance.
@retval EFI_SUCCESS - Access the data successfully.
@return other - An error occurred when operating on the disk.
**/
EFI_STATUS
FatAccessOFile (
IN FAT_OFILE *OFile,
IN IO_MODE IoMode,
IN UINTN Position,
IN UINTN *DataBufferSize,
IN UINT8 *UserBuffer,
IN FAT_TASK *Task
);
/**
Expand OFile by appending zero bytes at the end of OFile.
@param OFile - The open file.
@param ExpandedSize - The number of zero bytes appended at the end of the file.
@retval EFI_SUCCESS - The file is expanded successfully.
@return other - An error occurred when expanding file.
**/
EFI_STATUS
FatExpandOFile (
IN FAT_OFILE *OFile,
IN UINT64 ExpandedSize
);
/**
Write zero pool from the WritePos to the end of OFile.
@param OFile - The open file to write zero pool.
@param WritePos - The number of zero bytes written.
@retval EFI_SUCCESS - Write the zero pool successfully.
@retval EFI_OUT_OF_RESOURCES - Not enough memory to perform the operation.
@return other - An error occurred when writing disk.
**/
EFI_STATUS
FatWriteZeroPool (
IN FAT_OFILE *OFile,
IN UINTN WritePos
);
/**
Truncate the OFile to smaller file size.
@param OFile - The open file.
@param TruncatedSize - The new file size.
@retval EFI_SUCCESS - The file is truncated successfully.
@return other - An error occurred when truncating file.
**/
EFI_STATUS
FatTruncateOFile (
IN FAT_OFILE *OFile,
IN UINTN TruncatedSize
);
//
// DirectoryManage.c
//
/**
Set the OFile's current directory cursor to the list head.
@param OFile - The directory OFile whose directory cursor is reset.
**/
VOID
FatResetODirCursor (
IN FAT_OFILE *OFile
);
/**
Set the directory's cursor to the next and get the next directory entry.
@param OFile - The parent OFile.
@param PtrDirEnt - The next directory entry.
@retval EFI_SUCCESS - We get the next directory entry successfully.
@return other - An error occurred when get next directory entry.
**/
EFI_STATUS
FatGetNextDirEnt (
IN FAT_OFILE *OFile,
OUT FAT_DIRENT **PtrDirEnt
);
/**
Remove this directory entry node from the list of directory entries and hash table.
@param OFile - The parent OFile.
@param DirEnt - The directory entry to be removed.
@retval EFI_SUCCESS - The directory entry is successfully removed.
@return other - An error occurred when removing the directory entry.
**/
EFI_STATUS
FatRemoveDirEnt (
IN FAT_OFILE *OFile,
IN FAT_DIRENT *DirEnt
);
/**
Save the directory entry to disk.
@param OFile - The parent OFile which needs to update.
@param DirEnt - The directory entry to be saved.
@retval EFI_SUCCESS - Store the directory entry successfully.
@return other - An error occurred when writing the directory entry.
**/
EFI_STATUS
FatStoreDirEnt (
IN FAT_OFILE *OFile,
IN FAT_DIRENT *DirEnt
);
/**
Create a directory entry in the parent OFile.
@param OFile - The parent OFile.
@param FileName - The filename of the newly-created directory entry.
@param Attributes - The attribute of the newly-created directory entry.
@param PtrDirEnt - The pointer to the newly-created directory entry.
@retval EFI_SUCCESS - The directory entry is successfully created.
@retval EFI_OUT_OF_RESOURCES - Not enough memory to create the directory entry.
@return other - An error occurred when creating the directory entry.
**/
EFI_STATUS
FatCreateDirEnt (
IN FAT_OFILE *OFile,
IN CHAR16 *FileName,
IN UINT8 Attributes,
OUT FAT_DIRENT **PtrDirEnt
);
/**
Determine whether the directory entry is "." or ".." entry.
@param DirEnt - The corresponding directory entry.
@retval TRUE - The directory entry is "." or ".." directory entry
@retval FALSE - The directory entry is not "." or ".." directory entry
**/
BOOLEAN
FatIsDotDirEnt (
IN FAT_DIRENT *DirEnt
);
/**
Set the OFile's cluster and size info in its directory entry.
@param OFile - The corresponding OFile.
**/
VOID
FatUpdateDirEntClusterSizeInfo (
IN FAT_OFILE *OFile
);
/**
Copy all the information of DirEnt2 to DirEnt1 except for 8.3 name.
@param DirEnt1 - The destination directory entry.
@param DirEnt2 - The source directory entry.
**/
VOID
FatCloneDirEnt (
IN FAT_DIRENT *DirEnt1,
IN FAT_DIRENT *DirEnt2
);
/**
Get the directory entry's info into Buffer.
@param Volume - FAT file system volume.
@param DirEnt - The corresponding directory entry.
@param BufferSize - Size of Buffer.
@param Buffer - Buffer containing file info.
@retval EFI_SUCCESS - Get the file info successfully.
@retval EFI_BUFFER_TOO_SMALL - The buffer is too small.
**/
EFI_STATUS
FatGetDirEntInfo (
IN FAT_VOLUME *Volume,
IN FAT_DIRENT *DirEnt,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
);
/**
Open the directory entry to get the OFile.
@param Parent - The parent OFile.
@param DirEnt - The directory entry to be opened.
@retval EFI_SUCCESS - The directory entry is successfully opened.
@retval EFI_OUT_OF_RESOURCES - not enough memory to allocate a new OFile.
@return other - An error occurred when opening the directory entry.
**/
EFI_STATUS
FatOpenDirEnt (
IN FAT_OFILE *OFile,
IN FAT_DIRENT *DirEnt
);
/**
Create "." and ".." directory entries in the newly-created parent OFile.
@param OFile - The parent OFile.
@retval EFI_SUCCESS - The dot directory entries are successfully created.
@return other - An error occurred when creating the directory entry.
**/
EFI_STATUS
FatCreateDotDirEnts (
IN FAT_OFILE *OFile
);
/**
Close the directory entry and free the OFile.
@param DirEnt - The directory entry to be closed.
**/
VOID
FatCloseDirEnt (
IN FAT_DIRENT *DirEnt
);
/**
Traverse filename and open all OFiles that can be opened.
Update filename pointer to the component that can't be opened.
If more than one name component remains, returns an error;
otherwise, return the remaining name component so that the caller might choose to create it.
@param PtrOFile - As input, the reference OFile; as output, the located OFile.
@param FileName - The file name relevant to the OFile.
@param Attributes - The attribute of the destination OFile.
@param NewFileName - The remaining file name.
@retval EFI_NOT_FOUND - The file name can't be opened and there is more than one
components within the name left (this means the name can
not be created either).
@retval EFI_INVALID_PARAMETER - The parameter is not valid.
@retval EFI_SUCCESS - Open the file successfully.
@return other - An error occured when locating the OFile.
**/
EFI_STATUS
FatLocateOFile (
IN OUT FAT_OFILE **PtrOFile,
IN CHAR16 *FileName,
IN UINT8 Attributes,
OUT CHAR16 *NewFileName
);
/**
Get the directory entry for the volume.
@param Volume - FAT file system volume.
@param Name - The file name of the volume.
@retval EFI_SUCCESS - Update the volume with the directory entry sucessfully.
@return others - An error occurred when getting volume label.
**/
EFI_STATUS
FatGetVolumeEntry (
IN FAT_VOLUME *Volume,
IN CHAR16 *Name
);
/**
Set the relevant directory entry into disk for the volume.
@param Volume - FAT file system volume.
@param Name - The new file name of the volume.
@retval EFI_SUCCESS - Update the Volume sucessfully.
@retval EFI_UNSUPPORTED - The input label is not a valid volume label.
@return other - An error occurred when setting volume label.
**/
EFI_STATUS
FatSetVolumeEntry (
IN FAT_VOLUME *Volume,
IN CHAR16 *Name
);
//
// Hash.c
//
/**
Search the long name hash table for the directory entry.
@param ODir - The directory to be searched.
@param LongNameString - The long name string to search.
@return The previous long name hash node of the directory entry.
**/
FAT_DIRENT **
FatLongNameHashSearch (
IN FAT_ODIR *ODir,
IN CHAR16 *LongNameString
);
/**
Search the short name hash table for the directory entry.
@param ODir - The directory to be searched.
@param ShortNameString - The short name string to search.
@return The previous short name hash node of the directory entry.
**/
FAT_DIRENT **
FatShortNameHashSearch (
IN FAT_ODIR *ODir,
IN CHAR8 *ShortNameString
);
/**
Insert directory entry to hash table.
@param ODir - The parent directory.
@param DirEnt - The directory entry node.
**/
VOID
FatInsertToHashTable (
IN FAT_ODIR *ODir,
IN FAT_DIRENT *DirEnt
);
/**
Delete directory entry from hash table.
@param ODir - The parent directory.
@param DirEnt - The directory entry node.
**/
VOID
FatDeleteFromHashTable (
IN FAT_ODIR *ODir,
IN FAT_DIRENT *DirEnt
);
//
// FileName.c
//
/**
This function checks whether the input FileName is a valid 8.3 short name.
If the input FileName is a valid 8.3, the output is the 8.3 short name;
otherwise, the output is the base tag of 8.3 short name.
@param FileName - The input unicode filename.
@param File8Dot3Name - The output ascii 8.3 short name or base tag of 8.3 short name.
@retval TRUE - The input unicode filename is a valid 8.3 short name.
@retval FALSE - The input unicode filename is not a valid 8.3 short name.
**/
BOOLEAN
FatCheckIs8Dot3Name (
IN CHAR16 *FileName,
OUT CHAR8 *File8Dot3Name
);
/**
This function generates 8Dot3 name from user specified name for a newly created file.
@param Parent - The parent directory.
@param DirEnt - The directory entry whose 8Dot3Name needs to be generated.
**/
VOID
FatCreate8Dot3Name (
IN FAT_OFILE *Parent,
IN FAT_DIRENT *DirEnt
);
/**
Convert the ascii fat name to the unicode string and strip trailing spaces,
and if necessary, convert the unicode string to lower case.
@param FatName - The Char8 string needs to be converted.
@param Len - The length of the fat name.
@param LowerCase - Indicate whether to convert the string to lower case.
@param Str - The result of the convertion.
**/
VOID
FatNameToStr (
IN CHAR8 *FatName,
IN UINTN Len,
IN UINTN LowerCase,
IN CHAR16 *Str
);
/**
Set the caseflag value for the directory entry.
@param DirEnt - The logical directory entry whose caseflag value is to be set.
**/
VOID
FatSetCaseFlag (
IN FAT_DIRENT *DirEnt
);
/**
Convert the 8.3 ASCII fat name to cased Unicode string according to case flag.
@param DirEnt - The corresponding directory entry.
@param FileString - The output Unicode file name.
@param FileStringMax The max length of FileString.
**/
VOID
FatGetFileNameViaCaseFlag (
IN FAT_DIRENT *DirEnt,
IN OUT CHAR16 *FileString,
IN UINTN FileStringMax
);
/**
Get the Check sum for a short name.
@param ShortNameString - The short name for a file.
@retval Sum - UINT8 checksum.
**/
UINT8
FatCheckSum (
IN CHAR8 *ShortNameString
);
/**
Takes Path as input, returns the next name component
in Name, and returns the position after Name (e.g., the
start of the next name component)
@param Path - The path of one file.
@param Name - The next name component in Path.
The position after Name in the Path
**/
CHAR16*
FatGetNextNameComponent (
IN CHAR16 *Path,
OUT CHAR16 *Name
);
/**
Check whether the IFileName is valid long file name. If the IFileName is a valid
long file name, then we trim the possible leading blanks and leading/trailing dots.
the trimmed filename is stored in OutputFileName
@param InputFileName - The input file name.
@param OutputFileName - The output file name.
@retval TRUE - The InputFileName is a valid long file name.
@retval FALSE - The InputFileName is not a valid long file name.
**/
BOOLEAN
FatFileNameIsValid (
IN CHAR16 *InputFileName,
OUT CHAR16 *OutputFileName
);
//
// DirectoryCache.c
//
/**
Discard the directory structure when an OFile will be freed.
Volume will cache this directory if the OFile does not represent a deleted file.
@param OFile - The OFile whose directory structure is to be discarded.
**/
VOID
FatDiscardODir (
IN FAT_OFILE *OFile
);
/**
Request the directory structure when an OFile is newly generated.
If the directory structure is cached by volume, then just return this directory;
Otherwise, allocate a new one for OFile.
@param OFile - The OFile which requests directory structure.
**/
VOID
FatRequestODir (
IN FAT_OFILE *OFile
);
/**
Clean up all the cached directory structures when the volume is going to be abandoned.
@param Volume - FAT file system volume.
**/
VOID
FatCleanupODirCache (
IN FAT_VOLUME *Volume
);
//
// Global Variables
//
extern EFI_DRIVER_BINDING_PROTOCOL gFatDriverBinding;
extern EFI_COMPONENT_NAME_PROTOCOL gFatComponentName;
extern EFI_COMPONENT_NAME2_PROTOCOL gFatComponentName2;
extern EFI_LOCK FatFsLock;
extern EFI_LOCK FatTaskLock;
extern EFI_FILE_PROTOCOL FatFileInterface;
#endif
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