[stgt] [PATCH 0/2] RFC - Double-linked list backing store.

[Mark Harvey]

An alternative backing store primarily for SSC device which uses a meta-data header for each block of data.

Embedded with the metadata are forward & back pointers to next & previous headers forming a double-linked list of headers.

Patch 1/2 patch includes bs_tape and a couple of helper utilities for:
- creating 'blank' media
- Dumping media headers
Patch 2/2 patches the tgt-core-test script which I use to setup the VTL.

Note: The bs_tape is almost at the same level of functionality as the bs_ssc without Richard Sharps recent patches.


Pros: (I can see) of the embedded metadata headers include the ability to store variable data sizes (compressed, encrypted or just variable block writes). Metadata headers do not have to contain data (FILEMARKS, SETMARKS, End of Data markers etc). Not limited by preallocated structure at media creation time.

Cons: Custom format (i.e. can't use with ISO images)

Comments and ideas welcome.

Cheers
Mark Harvey
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