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/** @file
Fault Tolerant Write protocol provides boot-time service for fault tolerant
write capability for block devices. The protocol provides for non-volatile
storage of the intermediate data and private information a caller would need to
recover from a critical fault, such as a power failure.
Copyright (c) 2009 - 2018, Intel Corporation. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef _FW_FAULT_TOLERANT_WRITE_PROTOCOL_H_
#define _FW_FAULT_TOLERANT_WRITE_PROTOCOL_H_
#define EFI_FAULT_TOLERANT_WRITE_PROTOCOL_GUID \
{ \
0x3ebd9e82, 0x2c78, 0x4de6, {0x97, 0x86, 0x8d, 0x4b, 0xfc, 0xb7, 0xc8, 0x81 } \
}
//
// Forward reference for pure ANSI compatability
//
typedef struct _EFI_FAULT_TOLERANT_WRITE_PROTOCOL EFI_FAULT_TOLERANT_WRITE_PROTOCOL;
/**
Get the size of the largest block that can be updated in a fault-tolerant manner.
@param This Indicates a pointer to the calling context.
@param BlockSize A pointer to a caller-allocated UINTN that is
updated to indicate the size of the largest block
that can be updated.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED The function could not complete successfully.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_GET_MAX_BLOCK_SIZE)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
OUT UINTN *BlockSize
);
/**
Allocates space for the protocol to maintain information about writes.
Since writes must be completed in a fault-tolerant manner and multiple
writes require more resources to be successful, this function
enables the protocol to ensure that enough space exists to track
information about upcoming writes.
@param This A pointer to the calling context.
@param CallerId The GUID identifying the write.
@param PrivateDataSize The size of the caller's private data that must be
recorded for each write.
@param NumberOfWrites The number of fault tolerant block writes that will
need to occur.
@retval EFI_SUCCESS The function completed successfully
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_ACCESS_DENIED Not all allocated writes have been completed. All
writes must be completed or aborted before another
fault tolerant write can occur.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_ALLOCATE)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
IN EFI_GUID *CallerId,
IN UINTN PrivateDataSize,
IN UINTN NumberOfWrites
);
/**
Starts a target block update. This records information about the write
in fault tolerant storage, and will complete the write in a recoverable
manner, ensuring at all times that either the original contents or
the modified contents are available.
@param This The calling context.
@param Lba The logical block address of the target block.
@param Offset The offset within the target block to place the
data.
@param Length The number of bytes to write to the target block.
@param PrivateData A pointer to private data that the caller requires
to complete any pending writes in the event of a
fault.
@param FvBlockHandle The handle of FVB protocol that provides services
for reading, writing, and erasing the target block.
@param Buffer The data to write.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_BAD_BUFFER_SIZE The write would span a block boundary, which is not
a valid action.
@retval EFI_ACCESS_DENIED No writes have been allocated.
@retval EFI_NOT_READY The last write has not been completed. Restart()
must be called to complete it.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_WRITE)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
IN EFI_LBA Lba,
IN UINTN Offset,
IN UINTN Length,
IN VOID *PrivateData,
IN EFI_HANDLE FvbHandle,
IN VOID *Buffer
);
/**
Restarts a previously interrupted write. The caller must provide the
block protocol needed to complete the interrupted write.
@param This The calling context.
@param FvBlockProtocol The handle of FVB protocol that provides services.
for reading, writing, and erasing the target block.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_ACCESS_DENIED No pending writes exist.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_RESTART)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
IN EFI_HANDLE FvbHandle
);
/**
Aborts all previously allocated writes.
@param This The calling context.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_NOT_FOUND No allocated writes exist.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_ABORT)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This
);
/**
Starts a target block update. This function records information about the write
in fault-tolerant storage and completes the write in a recoverable
manner, ensuring at all times that either the original contents or
the modified contents are available.
@param This Indicates a pointer to the calling context.
@param CallerId The GUID identifying the last write.
@param Lba The logical block address of the last write.
@param Offset The offset within the block of the last write.
@param Length The length of the last write.
@param PrivateDataSize On input, the size of the PrivateData buffer. On
output, the size of the private data stored for
this write.
@param PrivateData A pointer to a buffer. The function will copy
PrivateDataSize bytes from the private data stored
for this write.
@param Complete A Boolean value with TRUE indicating that the write
was completed.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_ABORTED The function could not complete successfully.
@retval EFI_NOT_FOUND No allocated writes exist.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FAULT_TOLERANT_WRITE_GET_LAST_WRITE)(
IN EFI_FAULT_TOLERANT_WRITE_PROTOCOL *This,
OUT EFI_GUID *CallerId,
OUT EFI_LBA *Lba,
OUT UINTN *Offset,
OUT UINTN *Length,
IN OUT UINTN *PrivateDataSize,
OUT VOID *PrivateData,
OUT BOOLEAN *Complete
);
//
// Protocol declaration
//
struct _EFI_FAULT_TOLERANT_WRITE_PROTOCOL {
EFI_FAULT_TOLERANT_WRITE_GET_MAX_BLOCK_SIZE GetMaxBlockSize;
EFI_FAULT_TOLERANT_WRITE_ALLOCATE Allocate;
EFI_FAULT_TOLERANT_WRITE_WRITE Write;
EFI_FAULT_TOLERANT_WRITE_RESTART Restart;
EFI_FAULT_TOLERANT_WRITE_ABORT Abort;
EFI_FAULT_TOLERANT_WRITE_GET_LAST_WRITE GetLastWrite;
};
extern EFI_GUID gEfiFaultTolerantWriteProtocolGuid;
#endif
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