621 lines
16 KiB
C
621 lines
16 KiB
C
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/** @file
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Functions that perform file read/write.
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Copyright (c) 2005 - 2017, Intel Corporation. All rights reserved.<BR>
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "Fat.h"
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/**
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Get the file's position of the file.
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@param FHand - The handle of file.
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@param Position - The file's position of the file.
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@retval EFI_SUCCESS - Get the info successfully.
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@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
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@retval EFI_UNSUPPORTED - The open file is not a file.
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**/
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EFI_STATUS
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EFIAPI
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FatGetPosition (
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IN EFI_FILE_PROTOCOL *FHand,
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OUT UINT64 *Position
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)
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{
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FAT_IFILE *IFile;
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FAT_OFILE *OFile;
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IFile = IFILE_FROM_FHAND (FHand);
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OFile = IFile->OFile;
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if (OFile->Error == EFI_NOT_FOUND) {
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return EFI_DEVICE_ERROR;
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}
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if (OFile->ODir != NULL) {
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return EFI_UNSUPPORTED;
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}
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*Position = IFile->Position;
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return EFI_SUCCESS;
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}
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/**
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Set the file's position of the file.
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@param FHand - The handle of file.
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@param Position - The file's position of the file.
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@retval EFI_SUCCESS - Set the info successfully.
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@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
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@retval EFI_UNSUPPORTED - Set a directory with a not-zero position.
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**/
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EFI_STATUS
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EFIAPI
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FatSetPosition (
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IN EFI_FILE_PROTOCOL *FHand,
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IN UINT64 Position
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)
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{
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FAT_IFILE *IFile;
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FAT_OFILE *OFile;
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IFile = IFILE_FROM_FHAND (FHand);
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OFile = IFile->OFile;
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if (OFile->Error == EFI_NOT_FOUND) {
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return EFI_DEVICE_ERROR;
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}
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FatWaitNonblockingTask (IFile);
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//
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// If this is a directory, we can only set back to position 0
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//
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if (OFile->ODir != NULL) {
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if (Position != 0) {
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//
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// Reset current directory cursor;
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//
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return EFI_UNSUPPORTED;
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}
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FatResetODirCursor (OFile);
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}
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//
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// Set the position
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//
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if (Position == (UINT64)-1) {
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Position = OFile->FileSize;
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}
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//
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// Set the position
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//
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IFile->Position = Position;
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return EFI_SUCCESS;
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}
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/**
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Get the file info from the open file of the IFile into Buffer.
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@param IFile - The instance of the open file.
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@param BufferSize - Size of Buffer.
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@param Buffer - Buffer containing read data.
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@retval EFI_SUCCESS - Get the file info successfully.
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@retval other - An error occurred when operation the disk.
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**/
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EFI_STATUS
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FatIFileReadDir (
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IN FAT_IFILE *IFile,
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IN OUT UINTN *BufferSize,
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OUT VOID *Buffer
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)
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{
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EFI_STATUS Status;
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FAT_OFILE *OFile;
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FAT_ODIR *ODir;
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FAT_DIRENT *DirEnt;
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UINT32 CurrentPos;
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OFile = IFile->OFile;
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ODir = OFile->ODir;
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CurrentPos = ((UINT32) IFile->Position) / sizeof (FAT_DIRECTORY_ENTRY);
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//
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// We need to relocate the directory
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//
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if (CurrentPos < ODir->CurrentPos) {
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//
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// The directory cursor has been modified by another IFile, we reset the cursor
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//
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FatResetODirCursor (OFile);
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}
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//
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// We seek the next directory entry's position
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//
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do {
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Status = FatGetNextDirEnt (OFile, &DirEnt);
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if (EFI_ERROR (Status) || DirEnt == NULL) {
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//
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// Something error occurred or reach the end of directory,
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// return 0 buffersize
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//
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*BufferSize = 0;
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goto Done;
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}
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} while (ODir->CurrentPos <= CurrentPos);
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Status = FatGetDirEntInfo (OFile->Volume, DirEnt, BufferSize, Buffer);
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Done:
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//
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// Update IFile's Position
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//
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if (!EFI_ERROR (Status)) {
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//
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// Update IFile->Position, if everything is all right
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//
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CurrentPos = ODir->CurrentPos;
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IFile->Position = CurrentPos * sizeof (FAT_DIRECTORY_ENTRY);
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}
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return Status;
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}
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/**
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Get the file info from the open file of the IFile into Buffer.
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@param FHand - The file handle to access.
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@param IoMode - Indicate whether the access mode is reading or writing.
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@param BufferSize - Size of Buffer.
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@param Buffer - Buffer containing read data.
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@param Token - A pointer to the token associated with the transaction.
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@retval EFI_SUCCESS - Get the file info successfully.
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@retval EFI_DEVICE_ERROR - Can not find the OFile for the file.
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@retval EFI_VOLUME_CORRUPTED - The file type of open file is error.
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@retval EFI_WRITE_PROTECTED - The disk is write protect.
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@retval EFI_ACCESS_DENIED - The file is read-only.
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@return other - An error occurred when operating on the disk.
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**/
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EFI_STATUS
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FatIFileAccess (
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IN EFI_FILE_PROTOCOL *FHand,
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IN IO_MODE IoMode,
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IN OUT UINTN *BufferSize,
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IN OUT VOID *Buffer,
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IN EFI_FILE_IO_TOKEN *Token
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)
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{
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EFI_STATUS Status;
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FAT_IFILE *IFile;
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FAT_OFILE *OFile;
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FAT_VOLUME *Volume;
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UINT64 EndPosition;
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FAT_TASK *Task;
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IFile = IFILE_FROM_FHAND (FHand);
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OFile = IFile->OFile;
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Volume = OFile->Volume;
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Task = NULL;
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//
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// Write to a directory is unsupported
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//
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if ((OFile->ODir != NULL) && (IoMode == WriteData)) {
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return EFI_UNSUPPORTED;
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}
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if (OFile->Error == EFI_NOT_FOUND) {
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return EFI_DEVICE_ERROR;
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}
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if (IoMode == ReadData) {
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//
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// If position is at EOF, then return device error
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//
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if (IFile->Position > OFile->FileSize) {
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return EFI_DEVICE_ERROR;
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}
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} else {
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//
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// Check if the we can write data
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//
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if (Volume->ReadOnly) {
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return EFI_WRITE_PROTECTED;
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}
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if (IFile->ReadOnly) {
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return EFI_ACCESS_DENIED;
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}
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}
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if (Token == NULL) {
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FatWaitNonblockingTask (IFile);
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} else {
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//
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// Caller shouldn't call the non-blocking interfaces if the low layer doesn't support DiskIo2.
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// But if it calls, the below check can avoid crash.
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//
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if (FHand->Revision < EFI_FILE_PROTOCOL_REVISION2) {
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return EFI_UNSUPPORTED;
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}
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Task = FatCreateTask (IFile, Token);
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if (Task == NULL) {
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return EFI_OUT_OF_RESOURCES;
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}
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}
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FatAcquireLock ();
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Status = OFile->Error;
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if (!EFI_ERROR (Status)) {
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if (OFile->ODir != NULL) {
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//
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// Read a directory is supported
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//
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ASSERT (IoMode == ReadData);
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Status = FatIFileReadDir (IFile, BufferSize, Buffer);
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OFile = NULL;
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} else {
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//
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// Access a file
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//
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EndPosition = IFile->Position + *BufferSize;
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if (EndPosition > OFile->FileSize) {
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//
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// The position goes beyond the end of file
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//
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if (IoMode == ReadData) {
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//
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// Adjust the actual size read
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//
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*BufferSize -= (UINTN) EndPosition - OFile->FileSize;
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} else {
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//
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// We expand the file size of OFile
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//
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Status = FatGrowEof (OFile, EndPosition);
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if (EFI_ERROR (Status)) {
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//
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// Must update the file's info into the file's Directory Entry
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// and then flush the dirty cache info into disk.
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//
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*BufferSize = 0;
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FatOFileFlush (OFile);
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OFile = NULL;
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goto Done;
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}
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FatUpdateDirEntClusterSizeInfo (OFile);
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}
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}
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Status = FatAccessOFile (OFile, IoMode, (UINTN) IFile->Position, BufferSize, Buffer, Task);
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IFile->Position += *BufferSize;
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}
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}
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if (Token != NULL) {
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if (!EFI_ERROR (Status)) {
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Status = FatQueueTask (IFile, Task);
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} else {
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FatDestroyTask (Task);
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}
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}
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Done:
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//
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// On EFI_SUCCESS case, not calling FatCleanupVolume():
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// 1) The Cache flush operation is avoided to enhance
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// performance. Caller is responsible to call Flush() when necessary.
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// 2) The volume dirty bit is probably set already, and is expected to be
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// cleaned in subsequent Flush() or other operations.
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// 3) Write operation doesn't affect OFile/IFile structure, so
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// Reference checking is not necessary.
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//
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if (EFI_ERROR (Status)) {
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Status = FatCleanupVolume (Volume, OFile, Status, NULL);
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}
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FatReleaseLock ();
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return Status;
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|
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}
|
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|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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,
|
||
|
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OUT VOID *Buffer
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return FatIFileAccess (FHand, ReadData, BufferSize, Buffer, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return FatIFileAccess (FHand, ReadData, &Token->BufferSize, Token->Buffer, Token);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
Write the content of buffer into files.
|
||
|
|
|
||
|
|
@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 protect.
|
||
|
|
@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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return FatIFileAccess (FHand, WriteData, BufferSize, Buffer, NULL);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
return FatIFileAccess (FHand, WriteData, &Token->BufferSize, Token->Buffer, Token);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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 OUT UINTN *DataBufferSize,
|
||
|
|
IN OUT UINT8 *UserBuffer,
|
||
|
|
IN FAT_TASK *Task
|
||
|
|
)
|
||
|
|
{
|
||
|
|
FAT_VOLUME *Volume;
|
||
|
|
UINTN Len;
|
||
|
|
EFI_STATUS Status;
|
||
|
|
UINTN BufferSize;
|
||
|
|
|
||
|
|
BufferSize = *DataBufferSize;
|
||
|
|
Volume = OFile->Volume;
|
||
|
|
ASSERT_VOLUME_LOCKED (Volume);
|
||
|
|
|
||
|
|
Status = EFI_SUCCESS;
|
||
|
|
while (BufferSize > 0) {
|
||
|
|
//
|
||
|
|
// Seek the OFile to the file position
|
||
|
|
//
|
||
|
|
Status = FatOFilePosition (OFile, Position, BufferSize);
|
||
|
|
if (EFI_ERROR (Status)) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Clip length to block run
|
||
|
|
//
|
||
|
|
Len = BufferSize > OFile->PosRem ? OFile->PosRem : BufferSize;
|
||
|
|
|
||
|
|
//
|
||
|
|
// Write the data
|
||
|
|
//
|
||
|
|
Status = FatDiskIo (Volume, IoMode, OFile->PosDisk, Len, UserBuffer, Task);
|
||
|
|
if (EFI_ERROR (Status)) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Data was successfully accessed
|
||
|
|
//
|
||
|
|
Position += Len;
|
||
|
|
UserBuffer += Len;
|
||
|
|
BufferSize -= Len;
|
||
|
|
if (IoMode == WriteData) {
|
||
|
|
OFile->Dirty = TRUE;
|
||
|
|
OFile->Archive = TRUE;
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Make sure no outbound occurred
|
||
|
|
//
|
||
|
|
ASSERT (Position <= OFile->FileSize);
|
||
|
|
}
|
||
|
|
//
|
||
|
|
// Update the number of bytes accessed
|
||
|
|
//
|
||
|
|
*DataBufferSize -= BufferSize;
|
||
|
|
return Status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
EFI_STATUS Status;
|
||
|
|
UINTN WritePos;
|
||
|
|
|
||
|
|
WritePos = OFile->FileSize;
|
||
|
|
Status = FatGrowEof (OFile, ExpandedSize);
|
||
|
|
if (!EFI_ERROR (Status)) {
|
||
|
|
Status = FatWriteZeroPool (OFile, WritePos);
|
||
|
|
}
|
||
|
|
|
||
|
|
return Status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
EFI_STATUS Status;
|
||
|
|
VOID *ZeroBuffer;
|
||
|
|
UINTN AppendedSize;
|
||
|
|
UINTN BufferSize;
|
||
|
|
UINTN WriteSize;
|
||
|
|
|
||
|
|
AppendedSize = OFile->FileSize - WritePos;
|
||
|
|
BufferSize = AppendedSize;
|
||
|
|
if (AppendedSize > FAT_MAX_ALLOCATE_SIZE) {
|
||
|
|
//
|
||
|
|
// If the appended size is larger, maybe we can not allocate the whole
|
||
|
|
// memory once. So if the growed size is larger than 10M, we just
|
||
|
|
// allocate 10M memory (one healthy system should have 10M available
|
||
|
|
// memory), and then write the zerobuffer to the file several times.
|
||
|
|
//
|
||
|
|
BufferSize = FAT_MAX_ALLOCATE_SIZE;
|
||
|
|
}
|
||
|
|
|
||
|
|
ZeroBuffer = AllocateZeroPool (BufferSize);
|
||
|
|
if (ZeroBuffer == NULL) {
|
||
|
|
return EFI_OUT_OF_RESOURCES;
|
||
|
|
}
|
||
|
|
|
||
|
|
do {
|
||
|
|
WriteSize = AppendedSize > BufferSize ? BufferSize : (UINTN) AppendedSize;
|
||
|
|
AppendedSize -= WriteSize;
|
||
|
|
Status = FatAccessOFile (OFile, WriteData, WritePos, &WriteSize, ZeroBuffer, NULL);
|
||
|
|
if (EFI_ERROR (Status)) {
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
|
||
|
|
WritePos += WriteSize;
|
||
|
|
} while (AppendedSize > 0);
|
||
|
|
|
||
|
|
FreePool (ZeroBuffer);
|
||
|
|
return Status;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
|
||
|
|
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
|
||
|
|
)
|
||
|
|
{
|
||
|
|
OFile->FileSize = TruncatedSize;
|
||
|
|
return FatShrinkEof (OFile);
|
||
|
|
}
|