Store Pinning in information in a Real Database?

[kevina]

@Stebalien thinks we should store pinning information in a real database.

This could work, but one concern not discussed is the size. I believe this is one of the original reasons we did not originally do something similar before.

Depends on #5591

[kevina]

One of the reasons for my suggestion to using inode-like data structures is avoid a size increase for storing simple information such as reference counts, as if it part of the inode (#5528) it is just another 32 (or maybe 64) bits. If we store it separately there is the cost of the storing the key which can be significant. Especially for small blocks.