Commits on Sep 4, 2023

1. storage: fix chunk map compatibility …

   The blob cache file of nydusd v2.2 and <=v2.1 are in different
   formats, which are not compatible. Should use different chunk map
   files for them, in order to upgrade or downgrade smoothly.
   
   For the nydusd <=v2.1, the files in blob cache directory:
   
   ```
   $blob_id
   $blob_id.chunk_map
   ```
   
   For the nydusd =v2.2, the files in blob cache directory:
   
   ```
   $blob_id.blob.data
   $blob_id.chunk_map
   ```
   
   NOTE: nydusd (v2.2) maybe use the chunk map file of nydusd(<=v2.1),
   it will cause the corrupted blob cache data to be read.
   
   For the nydusd of current patch, the files in blob cache directory:
   
   ```
   $blob_id.blob.data
   $blob_id.blob.data.chunk_map
   ```
   
   NOTE: this will discard the old blob cache data and chunk map files.
   
   Signed-off-by: Yan Song <[email protected]>

   

   imeoer committed Sep 4, 2023
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