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Merge "libsnapshot: Add stubs for Xor Ops and Sequence Data"

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David Anderson 2021-06-14 21:20:24 +00:00 • committed by Gerrit Code Review
commit 4b15582828
2 changed files with 18 additions and 0 deletions
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11
fs_mgr/libsnapshot/cow_writer.cpp
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@ -58,6 +58,12 @@ bool ICowWriter::AddRawBlocks(uint64_t new_block_start, const void* data, size_t
return EmitRawBlocks(new_block_start, data, size);
}
bool AddXorBlocks(uint32_t /*new_block_start*/, const void* /*data*/, size_t /*size*/,
uint32_t /*old_block*/, uint16_t /*offset*/) {
LOG(ERROR) << "AddXorBlocks not yet implemented";
return false;
}
bool ICowWriter::AddZeroBlocks(uint64_t new_block_start, uint64_t num_blocks) {
uint64_t last_block = new_block_start + num_blocks - 1;
if (!ValidateNewBlock(last_block)) {
@ -70,6 +76,11 @@ bool ICowWriter::AddLabel(uint64_t label) {
return EmitLabel(label);
}
bool AddSequenceData(size_t /*num_ops*/, const uint32_t* /*data*/) {
LOG(ERROR) << "AddSequenceData not yet implemented";
return false;
}
bool ICowWriter::ValidateNewBlock(uint64_t new_block) {
if (options_.max_blocks && new_block >= options_.max_blocks.value()) {
LOG(ERROR) << "New block " << new_block << " exceeds maximum block count "

7
fs_mgr/libsnapshot/include/libsnapshot/cow_writer.h
View file

@ -55,12 +55,19 @@ class ICowWriter {
// Encode a sequence of raw blocks. |size| must be a multiple of the block size.
bool AddRawBlocks(uint64_t new_block_start, const void* data, size_t size);
// Add a sequence of xor'd blocks. |size| must be a multiple of the block size.
bool AddXorBlocks(uint32_t new_block_start, const void* data, size_t size, uint32_t old_block,
uint16_t offset);
// Encode a sequence of zeroed blocks. |size| must be a multiple of the block size.
bool AddZeroBlocks(uint64_t new_block_start, uint64_t num_blocks);
// Add a label to the op sequence.
bool AddLabel(uint64_t label);
// Add sequence data for op merging. Data is a list of the destination block numbers.
bool AddSequenceData(size_t num_ops, const uint32_t* data);
// Flush all pending writes. This must be called before closing the writer
// to ensure that the correct headers and footers are written.
virtual bool Finalize() = 0;