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Commit a33cdc99 authored by Kelvin Zhang's avatar Kelvin Zhang
Browse files

Add a function to determine cow op size 

This is useful for update-engine to run on-device size estimates.
For example, when user wants to turn off compression parameter
on demand.

Test: th
Change-Id: I1e9cca88dff2492feeada3edcf0da2eb5f9430cc
parent 364d5dfb

fs_mgr/libsnapshot/include/libsnapshot/cow_format.h

+10 −0
Original line number Diff line number Diff line
@@ -329,6 +329,16 @@ struct BufferState { 
    uint8_t read_ahead_state;

} __attribute__((packed));



constexpr size_t GetCowOpSize(size_t version) {

    if (version == 3) {

        return sizeof(CowOperationV3);

    } else if (version == 2 || version == 1) {

        return sizeof(CowOperationV2);

    } else {

        return 0;

    }

}



// 2MB Scratch space used for read-ahead

static constexpr uint64_t BUFFER_REGION_DEFAULT_SIZE = (1ULL << 21);