Fix: RAFS v5 chunkdict bootstrap metadata

[shu-pei]

Overview

When generating a RAFS v5 chunkdict bootstrap with chunkdict, several fields in the generated chunk metadata are incorrect.

1.

The original code calculates the chunkdict file offset with the compressed chunk size:

for (index, chunk_info) in chunkdict_chunks.iter().enumerate() {
    let chunk_size: u32 = chunk_info.chunk_compressed_size;
    let file_offset = index as u64 * chunk_size as u64;
    ...
    chunk.set_file_offset(file_offset);
}

file_offset is the logical offset inside the file, so it should be calculated from the uncompressed data size.

2.

When generating chunkdict chunk metadata, the original code does not set the COMPRESSED flag.

3.

The generated chunkdict entry is a regular file in the RAFS v5 bootstrap, but its inode digest is not set.
This breaks RAFS v5 inode digest validation. In rafs/src/metadata/layout/v5.rs, rafsv5_validate_inode()

4.

The original filecache logic forces chunkdict-generated blobs to load blob.meta:

let meta = if blob_info.meta_ci_is_valid()
    || blob_info.has_feature(BlobFeatures::IS_CHUNKDICT_GENERATED)
{
    ...
}

However, RAFS v5 blob table entries do not have valid meta_ci_* information for chunkdict blobs.

Related Issues

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