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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, Intel Corporation
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.
**/
#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 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 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 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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