Ploop/format
< PloopRevision as of 22:26, 25 December 2015 by Sergey Bronnikov (talk | contribs) (Marked this version for translation)
<translate> A ploop image file format is pretty simple.
- Image consists of cluster blocks (default cluster block size is 1 MB).
- First there are some cluster blocks with BAT (Block Allocation Table), then there are some cluster blocks with data.
- First 64 bytes of the first cluster block is a header, described in ploop1_image.h
- The rest of BAT is just an array of 4 byte slots.
- If a slot N contains value M, then a request to a cluster-block N of a /dev/ploopXXX device is redirected to a cluster-block M in an image file. N is counted from 0, while M is counted from 1 (0 means block is not yet allocated).
For the rest of the story, see sources. </translate>