Merge "libsnapshot: Use words for xor ops" into main
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
index ef311d4..33767d6 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/read_worker.cpp
@@ -104,6 +104,8 @@
}
bool ReadWorker::ProcessXorOp(const CowOperation* cow_op, void* buffer) {
+ using WordType = std::conditional_t<sizeof(void*) == sizeof(uint64_t), uint64_t, uint32_t>;
+
if (!ReadFromSourceDevice(cow_op, buffer)) {
return false;
}
@@ -120,9 +122,12 @@
return false;
}
- auto xor_out = reinterpret_cast<uint8_t*>(buffer);
- for (size_t i = 0; i < BLOCK_SZ; i++) {
- xor_out[i] ^= xor_buffer_[i];
+ auto xor_in = reinterpret_cast<const WordType*>(xor_buffer_.data());
+ auto xor_out = reinterpret_cast<WordType*>(buffer);
+ auto num_words = BLOCK_SZ / sizeof(WordType);
+
+ for (auto i = 0; i < num_words; i++) {
+ xor_out[i] ^= xor_in[i];
}
return true;
}
diff --git a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
index 6b1ed0c..9a1d441 100644
--- a/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
+++ b/fs_mgr/libsnapshot/snapuserd/user-space-merge/snapuserd_readahead.cpp
@@ -458,6 +458,7 @@
void ReadAhead::ProcessXorData(size_t& block_xor_index, size_t& xor_index,
std::vector<const CowOperation*>& xor_op_vec, void* buffer,
loff_t& buffer_offset) {
+ using WordType = std::conditional_t<sizeof(void*) == sizeof(uint64_t), uint64_t, uint32_t>;
loff_t xor_buf_offset = 0;
while (block_xor_index < blocks_.size()) {
@@ -470,13 +471,14 @@
// Check if this block is an XOR op
if (xor_op->new_block == new_block) {
// Pointer to the data read from base device
- uint8_t* buffer = reinterpret_cast<uint8_t*>(bufptr);
+ auto buffer_words = reinterpret_cast<WordType*>(bufptr);
// Get the xor'ed data read from COW device
- uint8_t* xor_data = reinterpret_cast<uint8_t*>((char*)bufsink_.GetPayloadBufPtr() +
- xor_buf_offset);
+ auto xor_data_words = reinterpret_cast<WordType*>(
+ (char*)bufsink_.GetPayloadBufPtr() + xor_buf_offset);
+ auto num_words = BLOCK_SZ / sizeof(WordType);
- for (size_t byte_offset = 0; byte_offset < BLOCK_SZ; byte_offset++) {
- buffer[byte_offset] ^= xor_data[byte_offset];
+ for (auto i = 0; i < num_words; i++) {
+ buffer_words[i] ^= xor_data_words[i];
}
// Move to next XOR op