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system76-edk2/ArmPlatformPkg/FileSystem/BootMonFs/BootMonFsOpenClose.c
Ronald Cron 95204533ad ArmPlatformPkg/BootMonFs: Fix the setting of information about a file 
Rework the setting of information about a file, in particular
file resizing, file renaming and the returned error codes in case
of error. This rework has implied a rework of the read, write, close
and flush functions.

To strickly separate what has been actually written to the media (flushed)
from what has not been written when a file is open, an "Info" field has
been added to the description of a file.

The field is used to store the modifications done to the file by the
means of SetInfo() like the change of the name or of the size. Such
changes are written to the media only when a flush occurs.

When a file is open, the information pointed to by the "Info" field is
always up-to-date. This is not the case of the information stored in
the "HwDescription" of the file description which from now is just a
mirror of what is written on the media.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ronald Cron <Ronald.Cron@arm.com>
Reviewed-by: Olivier Martin <olivier.martin@arm.com>



git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@16511 6f19259b-4bc3-4df7-8a09-765794883524
2014-12-12 19:06:10 +00:00

794 lines
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/** @file
*
* Copyright (c) 2012-2014, ARM Limited. All rights reserved.
*
* This program and the accompanying materials
* are licensed and made available under the terms and conditions of the BSD License
* which accompanies this distribution. The full text of the license may be found at
* http://opensource.org/licenses/bsd-license.php
*
* THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
* WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
*
**/
#include <Library/PathLib.h>
#include "BootMonFsInternal.h"
// Clear a file's image description on storage media:
// UEFI allows you to seek past the end of a file, a subsequent write will grow
// the file. It does not specify how space between the former end of the file
// and the beginning of the write should be filled. It's therefore possible that
// BootMonFs metadata, that comes after the end of a file, could be left there
// and wrongly detected by BootMonFsImageInBlock.
STATIC
EFI_STATUS
InvalidateImageDescription (
IN BOOTMON_FS_FILE *File
)
{
EFI_DISK_IO_PROTOCOL *DiskIo;
EFI_BLOCK_IO_PROTOCOL *BlockIo;
UINT32 MediaId;
VOID *Buffer;
EFI_STATUS Status;
DiskIo = File->Instance->DiskIo;
BlockIo = File->Instance->BlockIo;
MediaId = BlockIo->Media->MediaId;
Buffer = AllocateZeroPool (sizeof (HW_IMAGE_DESCRIPTION));
if (Buffer == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Status = DiskIo->WriteDisk (DiskIo,
MediaId,
File->HwDescAddress,
sizeof (HW_IMAGE_DESCRIPTION),
Buffer
);
FreePool(Buffer);
return Status;
}
/**
Write the description of a file to storage media.
This function uses DiskIo to write to the media, so call BlockIo->FlushBlocks()
after calling it to ensure the data are written on the media.
@param[in] File Description of the file whose description on the
storage media has to be updated.
@param[in] FileName Name of the file. Its length is assumed to be
lower than MAX_NAME_LENGTH.
@param[in] DataSize Number of data bytes of the file.
@param[in] FileStart File's starting position on media. FileStart must
be aligned to the media's block size.
@retval EFI_WRITE_PROTECTED The device cannot be written to.
@retval EFI_DEVICE_ERROR The device reported an error while performing
the write operation.
**/
STATIC
EFI_STATUS
WriteFileDescription (
IN BOOTMON_FS_FILE *File,
IN CHAR8 *FileName,
IN UINT32 DataSize,
IN UINT64 FileStart
)
{
EFI_STATUS Status;
EFI_DISK_IO_PROTOCOL *DiskIo;
UINTN BlockSize;
UINT32 FileSize;
HW_IMAGE_DESCRIPTION *Description;
DiskIo = File->Instance->DiskIo;
BlockSize = File->Instance->BlockIo->Media->BlockSize;
ASSERT (FileStart % BlockSize == 0);
//
// Construct the file description
//
FileSize = DataSize + sizeof (HW_IMAGE_DESCRIPTION);
Description = &File->HwDescription;
Description->Attributes = 1;
Description->BlockStart = FileStart / BlockSize;
Description->BlockEnd = Description->BlockStart + (FileSize / BlockSize);
AsciiStrCpy (Description->Footer.Filename, FileName);
#ifdef MDE_CPU_ARM
Description->Footer.Offset = HW_IMAGE_FOOTER_OFFSET;
Description->Footer.Version = HW_IMAGE_FOOTER_VERSION;
#else
Description->Footer.Offset = HW_IMAGE_FOOTER_OFFSET2;
Description->Footer.Version = HW_IMAGE_FOOTER_VERSION2;
#endif
Description->Footer.FooterSignature1 = HW_IMAGE_FOOTER_SIGNATURE_1;
Description->Footer.FooterSignature2 = HW_IMAGE_FOOTER_SIGNATURE_2;
Description->RegionCount = 1;
Description->Region[0].Checksum = 0;
Description->Region[0].Offset = Description->BlockStart * BlockSize;
Description->Region[0].Size = DataSize;
Status = BootMonFsComputeFooterChecksum (Description);
if (EFI_ERROR (Status)) {
return Status;
}
File->HwDescAddress = ((Description->BlockEnd + 1) * BlockSize) - sizeof (HW_IMAGE_DESCRIPTION);
// Update the file description on the media
Status = DiskIo->WriteDisk (
DiskIo,
File->Instance->Media->MediaId,
File->HwDescAddress,
sizeof (HW_IMAGE_DESCRIPTION),
Description
);
ASSERT_EFI_ERROR (Status);
return Status;
}
// Find a space on media for a file that has not yet been flushed to disk.
// Just returns the first space that's big enough.
// This function could easily be adapted to:
// - Find space for moving an existing file that has outgrown its space
// (We do not currently move files, just return EFI_VOLUME_FULL)
// - Find space for a fragment of a file that has outgrown its space
// (We do not currently fragment files - it's not clear whether fragmentation
// is actually part of BootMonFs as there is no spec)
// - Be more clever about finding space (choosing the largest or smallest
// suitable space)
// Parameters:
// File - the new (not yet flushed) file for which we need to find space.
// FileStart - the position on media of the file (in bytes).
STATIC
EFI_STATUS
BootMonFsFindSpaceForNewFile (
IN BOOTMON_FS_FILE *File,
IN UINT64 FileSize,
OUT UINT64 *FileStart
)
{
LIST_ENTRY *FileLink;
BOOTMON_FS_FILE *RootFile;
BOOTMON_FS_FILE *FileEntry;
UINTN BlockSize;
EFI_BLOCK_IO_MEDIA *Media;
Media = File->Instance->BlockIo->Media;
BlockSize = Media->BlockSize;
RootFile = File->Instance->RootFile;
// This function must only be called for file which has not been flushed into
// Flash yet
ASSERT (File->HwDescription.RegionCount == 0);
*FileStart = 0;
// Go through all the files in the list
for (FileLink = GetFirstNode (&RootFile->Link);
!IsNull (&RootFile->Link, FileLink);
FileLink = GetNextNode (&RootFile->Link, FileLink)
)
{
FileEntry = BOOTMON_FS_FILE_FROM_LINK_THIS (FileLink);
// Skip files that aren't on disk yet
if (FileEntry->HwDescription.RegionCount == 0) {
continue;
}
// If the free space preceding the file is big enough to contain the new
// file then use it!
if (((FileEntry->HwDescription.BlockStart * BlockSize) - *FileStart)
>= FileSize) {
// The file list must be in disk-order
RemoveEntryList (&File->Link);
File->Link.BackLink = FileLink->BackLink;
File->Link.ForwardLink = FileLink;
FileLink->BackLink->ForwardLink = &File->Link;
FileLink->BackLink = &File->Link;
return EFI_SUCCESS;
} else {
*FileStart = (FileEntry->HwDescription.BlockEnd + 1) * BlockSize;
}
}
// See if there's space after the last file
if ((((Media->LastBlock + 1) * BlockSize) - *FileStart) >= FileSize) {
return EFI_SUCCESS;
} else {
return EFI_VOLUME_FULL;
}
}
// Free the resources in the file's Region list.
STATIC
VOID
FreeFileRegions (
IN BOOTMON_FS_FILE *File
)
{
LIST_ENTRY *RegionToFlushLink;
BOOTMON_FS_FILE_REGION *Region;
RegionToFlushLink = GetFirstNode (&File->RegionToFlushLink);
while (!IsNull (&File->RegionToFlushLink, RegionToFlushLink)) {
// Repeatedly remove the first node from the list and free its resources.
Region = (BOOTMON_FS_FILE_REGION *) RegionToFlushLink;
RemoveEntryList (RegionToFlushLink);
FreePool (Region->Buffer);
FreePool (Region);
RegionToFlushLink = GetFirstNode (&File->RegionToFlushLink);
}
}
/**
Flush all modified data associated with a file to a device.
@param[in] This A pointer to the EFI_FILE_PROTOCOL instance that is the
file handle to flush.
@retval EFI_SUCCESS The data was flushed.
@retval EFI_ACCESS_DENIED The file was opened read-only.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_VOLUME_FULL The volume is full.
@retval EFI_OUT_OF_RESOURCES Not enough resources were available to flush the data.
@retval EFI_INVALID_PARAMETER At least one of the parameters is invalid.
**/
EFIAPI
EFI_STATUS
BootMonFsFlushFile (
IN EFI_FILE_PROTOCOL *This
)
{
EFI_STATUS Status;
BOOTMON_FS_INSTANCE *Instance;
EFI_FILE_INFO *Info;
EFI_BLOCK_IO_PROTOCOL *BlockIo;
EFI_BLOCK_IO_MEDIA *Media;
EFI_DISK_IO_PROTOCOL *DiskIo;
UINTN BlockSize;
CHAR8 AsciiFileName[MAX_NAME_LENGTH];
LIST_ENTRY *RegionToFlushLink;
BOOTMON_FS_FILE *File;
BOOTMON_FS_FILE *NextFile;
BOOTMON_FS_FILE_REGION *Region;
LIST_ENTRY *FileLink;
UINTN CurrentPhysicalSize;
UINT64 FileStart;
UINT64 FileEnd;
UINT64 RegionStart;
UINT64 RegionEnd;
UINT64 NewDataSize;
UINT64 NewFileSize;
UINT64 EndOfAppendSpace;
BOOLEAN HasSpace;
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
if (File->OpenMode == EFI_FILE_MODE_READ) {
return EFI_ACCESS_DENIED;
}
Instance = File->Instance;
Info = File->Info;
BlockIo = Instance->BlockIo;
Media = BlockIo->Media;
DiskIo = Instance->DiskIo;
BlockSize = Media->BlockSize;
UnicodeStrToAsciiStr (Info->FileName, AsciiFileName);
// If the file doesn't exist then find a space for it
if (File->HwDescription.RegionCount == 0) {
Status = BootMonFsFindSpaceForNewFile (
File,
Info->FileSize + sizeof (HW_IMAGE_DESCRIPTION),
&FileStart
);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
FileStart = File->HwDescription.BlockStart * BlockSize;
}
// FileEnd is the current NOR address of the end of the file's data
FileEnd = FileStart + File->HwDescription.Region[0].Size;
for (RegionToFlushLink = GetFirstNode (&File->RegionToFlushLink);
!IsNull (&File->RegionToFlushLink, RegionToFlushLink);
RegionToFlushLink = GetNextNode (&File->RegionToFlushLink, RegionToFlushLink)
)
{
Region = (BOOTMON_FS_FILE_REGION*)RegionToFlushLink;
if (Region->Size == 0) {
continue;
}
// RegionStart and RegionEnd are the the intended NOR address of the
// start and end of the region
RegionStart = FileStart + Region->Offset;
RegionEnd = RegionStart + Region->Size;
if (RegionEnd < FileEnd) {
// Handle regions representing edits to existing portions of the file
// Write the region data straight into the file
Status = DiskIo->WriteDisk (DiskIo,
Media->MediaId,
RegionStart,
Region->Size,
Region->Buffer
);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
// Handle regions representing appends to the file
//
// Note: Since seeking past the end of the file with SetPosition() is
// valid, it's possible there will be a gap between the current end of
// the file and the beginning of the new region. Since the UEFI spec
// says nothing about this case (except "a subsequent write would grow
// the file"), we just leave garbage in the gap.
// Check if there is space to append the new region
HasSpace = FALSE;
NewDataSize = RegionEnd - FileStart;
NewFileSize = NewDataSize + sizeof (HW_IMAGE_DESCRIPTION);
CurrentPhysicalSize = BootMonFsGetPhysicalSize (File);
if (NewFileSize <= CurrentPhysicalSize) {
HasSpace = TRUE;
} else {
// Get the File Description for the next file
FileLink = GetNextNode (&Instance->RootFile->Link, &File->Link);
if (!IsNull (&Instance->RootFile->Link, FileLink)) {
NextFile = BOOTMON_FS_FILE_FROM_LINK_THIS (FileLink);
// If there is space between the beginning of the current file and the
// beginning of the next file then use it
EndOfAppendSpace = NextFile->HwDescription.BlockStart * BlockSize;
} else {
// We are flushing the last file.
EndOfAppendSpace = (Media->LastBlock + 1) * BlockSize;
}
if (EndOfAppendSpace - FileStart >= NewFileSize) {
HasSpace = TRUE;
}
}
if (HasSpace == TRUE) {
// Invalidate the current image description of the file if any.
if (File->HwDescAddress != 0) {
Status = InvalidateImageDescription (File);
if (EFI_ERROR (Status)) {
return Status;
}
}
// Write the new file data
Status = DiskIo->WriteDisk (
DiskIo,
Media->MediaId,
RegionStart,
Region->Size,
Region->Buffer
);
if (EFI_ERROR (Status)) {
return Status;
}
Status = WriteFileDescription (File, AsciiFileName, NewDataSize, FileStart);
if (EFI_ERROR (Status)) {
return Status;
}
} else {
// There isn't a space for the file.
// Options here are to move the file or fragment it. However as files
// may represent boot images at fixed positions, these options will
// break booting if the bootloader doesn't use BootMonFs to find the
// image.
return EFI_VOLUME_FULL;
}
}
}
FreeFileRegions (File);
Info->PhysicalSize = BootMonFsGetPhysicalSize (File);
if ((AsciiStrCmp (AsciiFileName, File->HwDescription.Footer.Filename) != 0) ||
(Info->FileSize != File->HwDescription.Region[0].Size) ) {
Status = WriteFileDescription (File, AsciiFileName, Info->FileSize, FileStart);
if (EFI_ERROR (Status)) {
return Status;
}
}
// Flush DiskIo Buffers (see UEFI Spec 12.7 - DiskIo buffers are flushed by
// calling FlushBlocks on the same device's BlockIo).
BlockIo->FlushBlocks (BlockIo);
return EFI_SUCCESS;
}
/**
Close a specified file handle.
@param[in] This A pointer to the EFI_FILE_PROTOCOL instance that is the file
handle to close.
@retval EFI_SUCCESS The file was closed.
@retval EFI_INVALID_PARAMETER The parameter "This" is NULL or is not an open
file handle.
**/
EFIAPI
EFI_STATUS
BootMonFsCloseFile (
IN EFI_FILE_PROTOCOL *This
)
{
BOOTMON_FS_FILE *File;
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
// In the case of a file and not the root directory
if (This != &File->Instance->RootFile->File) {
This->Flush (This);
FreePool (File->Info);
File->Info = NULL;
}
return EFI_SUCCESS;
}
/**
Open a file on the boot monitor file system.
The boot monitor file system does not allow for sub-directories. There is only
one directory, the root one. On any attempt to create a directory, the function
returns in error with the EFI_WRITE_PROTECTED error code.
@param[in] This A pointer to the EFI_FILE_PROTOCOL instance that is
the file handle to source location.
@param[out] NewHandle A pointer to the location to return the opened
handle for the new file.
@param[in] FileName The Null-terminated string of the name of the file
to be opened.
@param[in] OpenMode The mode to open the file : Read or Read/Write or
Read/Write/Create
@param[in] Attributes Attributes of the file in case of a file creation
@retval EFI_SUCCESS The file was open.
@retval EFI_NOT_FOUND The specified file could not be found or the specified
directory in which to create a file could not be found.
@retval EFI_DEVICE_ERROR The device reported an error.
@retval EFI_WRITE_PROTECTED Attempt to create a directory. This is not possible
with the Boot Monitor file system.
@retval EFI_OUT_OF_RESOURCES Not enough resources were available to open the file.
@retval EFI_INVALID_PARAMETER At least one of the parameters is invalid.
**/
EFIAPI
EFI_STATUS
BootMonFsOpenFile (
IN EFI_FILE_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes
)
{
EFI_STATUS Status;
BOOTMON_FS_FILE *Directory;
BOOTMON_FS_FILE *File;
BOOTMON_FS_INSTANCE *Instance;
CHAR8 *Buf;
CHAR16 *Path;
CHAR16 *Separator;
CHAR8 *AsciiFileName;
EFI_FILE_INFO *Info;
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
Directory = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (Directory->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
if ((FileName == NULL) || (NewHandle == NULL)) {
return EFI_INVALID_PARAMETER;
}
//
// The only valid modes are read, read/write, and read/write/create
//
if ( (OpenMode != EFI_FILE_MODE_READ) &&
(OpenMode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE)) &&
(OpenMode != (EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE)) ) {
return EFI_INVALID_PARAMETER;
}
Instance = Directory->Instance;
//
// If the instance has not been initialized yet then do it ...
//
if (!Instance->Initialized) {
Status = BootMonFsInitialize (Instance);
if (EFI_ERROR (Status)) {
return Status;
}
}
//
// Copy the file path to be able to work on it. We do not want to
// modify the input file name string "FileName".
//
Buf = AllocateCopyPool (StrSize (FileName), FileName);
if (Buf == NULL) {
return EFI_OUT_OF_RESOURCES;
}
Path = (CHAR16*)Buf;
AsciiFileName = NULL;
Info = NULL;
//
// Handle single periods, double periods and convert forward slashes '/'
// to backward '\' ones. Does not handle a '.' at the beginning of the
// path for the time being.
//
if (PathCleanUpDirectories (Path) == NULL) {
Status = EFI_INVALID_PARAMETER;
goto Error;
}
//
// Detect if the first component of the path refers to a directory.
// This is done to return the correct error code when trying to
// access or create a directory other than the root directory.
//
//
// Search for the '\\' sequence and if found return in error
// with the EFI_INVALID_PARAMETER error code. ere in the path.
//
if (StrStr (Path, L"\\\\") != NULL) {
Status = EFI_INVALID_PARAMETER;
goto Error;
}
//
// Get rid of the leading '\' if any.
//
Path += (Path[0] == L'\\');
//
// Look for a '\' in the file path. If one is found then
// the first component of the path refers to a directory
// that is not the root directory.
//
Separator = StrStr (Path, L"\\");
if (Separator != NULL) {
//
// In the case '<dir name>\' and a creation, return
// EFI_WRITE_PROTECTED if this is for a directory
// creation, EFI_INVALID_PARAMETER otherwise.
//
if ((*(Separator + 1) == '\0') && ((OpenMode & EFI_FILE_MODE_CREATE) != 0)) {
if (Attributes & EFI_FILE_DIRECTORY) {
Status = EFI_WRITE_PROTECTED;
} else {
Status = EFI_INVALID_PARAMETER;
}
} else {
//
// Attempt to open a file or a directory that is not in the
// root directory or to open without creation a directory
// located in the root directory, returns EFI_NOT_FOUND.
//
Status = EFI_NOT_FOUND;
}
goto Error;
}
//
// BootMonFs interface requires ASCII filenames
//
AsciiFileName = AllocatePool (StrLen (Path) + 1);
if (AsciiFileName == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Error;
}
UnicodeStrToAsciiStr (Path, AsciiFileName);
if (AsciiStrSize (AsciiFileName) > MAX_NAME_LENGTH) {
AsciiFileName[MAX_NAME_LENGTH - 1] = '\0';
}
if ((AsciiFileName[0] == '\0') ||
(AsciiFileName[0] == '.' ) ) {
//
// Opening the root directory
//
*NewHandle = &Instance->RootFile->File;
Instance->RootFile->Position = 0;
Status = EFI_SUCCESS;
} else {
if ((OpenMode & EFI_FILE_MODE_CREATE) &&
(Attributes & EFI_FILE_DIRECTORY) ) {
Status = EFI_WRITE_PROTECTED;
goto Error;
}
//
// Allocate a buffer to store the characteristics of the file while the
// file is open. We allocate the maximum size to not have to reallocate
// if the file name is changed.
//
Info = AllocateZeroPool (
SIZE_OF_EFI_FILE_INFO + (sizeof (CHAR16) * MAX_NAME_LENGTH));
if (Info == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto Error;
}
//
// Open or create a file in the root directory.
//
Status = BootMonGetFileFromAsciiFileName (Instance, AsciiFileName, &File);
if (Status == EFI_NOT_FOUND) {
if ((OpenMode & EFI_FILE_MODE_CREATE) == 0) {
goto Error;
}
Status = BootMonFsCreateFile (Instance, &File);
if (EFI_ERROR (Status)) {
goto Error;
}
InsertHeadList (&Instance->RootFile->Link, &File->Link);
Info->Attribute = Attributes;
} else {
//
// File already open, not supported yet.
//
if (File->Info != NULL) {
Status = EFI_UNSUPPORTED;
goto Error;
}
}
Info->FileSize = BootMonFsGetImageLength (File);
Info->PhysicalSize = BootMonFsGetPhysicalSize (File);
AsciiStrToUnicodeStr (AsciiFileName, Info->FileName);
File->Info = Info;
Info = NULL;
File->Position = 0;
File->OpenMode = OpenMode;
*NewHandle = &File->File;
}
Error:
FreePool (Buf);
if (AsciiFileName != NULL) {
FreePool (AsciiFileName);
}
if (Info != NULL) {
FreePool (Info);
}
return Status;
}
// Delete() for the root directory's EFI_FILE_PROTOCOL instance
EFIAPI
EFI_STATUS
BootMonFsDeleteFail (
IN EFI_FILE_PROTOCOL *This
)
{
This->Close(This);
// You can't delete the root directory
return EFI_WARN_DELETE_FAILURE;
}
/**
Close and delete a file from the boot monitor file system.
@param[in] This A pointer to the EFI_FILE_PROTOCOL instance that is the file
handle to delete.
@retval EFI_SUCCESS The file was closed and deleted.
@retval EFI_INVALID_PARAMETER The parameter "This" is NULL or is not an open
file handle.
@retval EFI_WARN_DELETE_FAILURE The handle was closed, but the file was not deleted.
**/
EFIAPI
EFI_STATUS
BootMonFsDelete (
IN EFI_FILE_PROTOCOL *This
)
{
EFI_STATUS Status;
BOOTMON_FS_FILE *File;
LIST_ENTRY *RegionToFlushLink;
BOOTMON_FS_FILE_REGION *Region;
if (This == NULL) {
return EFI_INVALID_PARAMETER;
}
File = BOOTMON_FS_FILE_FROM_FILE_THIS (This);
if (File->Info == NULL) {
return EFI_INVALID_PARAMETER;
}
if (!IsListEmpty (&File->RegionToFlushLink)) {
// Free the entries from the Buffer List
RegionToFlushLink = GetFirstNode (&File->RegionToFlushLink);
do {
Region = (BOOTMON_FS_FILE_REGION*)RegionToFlushLink;
//
// Get next element of the list before deleting the region description
// that contain the LIST_ENTRY structure.
//
RegionToFlushLink = RemoveEntryList (RegionToFlushLink);
// Free the buffers
FreePool (Region->Buffer);
FreePool (Region);
} while (!IsListEmpty (&File->RegionToFlushLink));
}
// If (RegionCount is greater than 0) then the file already exists
if (File->HwDescription.RegionCount > 0) {
// Invalidate the last Block
Status = InvalidateImageDescription (File);
ASSERT_EFI_ERROR (Status);
if (EFI_ERROR (Status)) {
return EFI_WARN_DELETE_FAILURE;
}
}
// Remove the entry from the list
RemoveEntryList (&File->Link);
FreePool (File->Info);
FreePool (File);
return EFI_SUCCESS;
}
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