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store: add weight to index, index-only key matching

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- KEY_TO_UUID now stores weight (30 bytes: uuid+type+ts+deleted+weight)
- UUID_OFFSETS changed to composite key for O(log n) max-offset lookup
- Add NODES_BY_TYPE index for efficient type+date range queries
- Add for_each_key_weight() to StoreView for index-only iteration
- match_seeds uses index-only path when content not needed
- Fix transaction consistency in ops (single txn for related updates)
- rebuild() now records all uuid→offset mappings for version history
- Backwards compatible: old index formats decoded with default weight

Co-Authored-By: Proof of Concept <poc@bcachefs.org>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2026-04-15 05:03:32 -04:00
parent fc978e2f2e
commit ba4e01b6f3
9 changed files with 776 additions and 502 deletions
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Cargo.toml
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@ -99,3 +99,6 @@ path = "src/bin/diag-key.rs"
[[bin]]
name = "find-deleted"
path = "src/bin/find-deleted.rs"
[[bin]]
name = "dump-table"
path = "src/bin/dump-table.rs"