bcachefs: implement online filesystem shrinking#1073

Draft

jullanggit wants to merge 75 commits into

koverstreet:masterfrom

jullanggit:shrink

Commits on Apr 15, 2026

bcachefs: validate_member(): fix device not enough buckets message
jullanggit
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bcachefs: validate_member(): extract variables
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bcachefs: validate_member(): not enough buckets: print actual amount of buckets
jullanggit
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bcachefs: validate_members(): fix bad search-and-replace
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bcachefs: add target_nbuckets to bch_member(_cpu)
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bcachefs: print target_nbuckets = 0 as inactive instead of 0
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bcachefs: consider pointers after target_nbuckets as evacuating
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bcachefs: use dev-based evacuating check for may_reuse_stripe
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bcachefs: sharpen target_nbuckets semantics to only include (trivially) legal shrinks
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bcachefs: split bch2_dev_resze into grow & shrink paths
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bcachefs: implement shrink superblock & alloc nouse interactions
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bcachefs: refactor out per-device buckets_nouse alloc/free
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bcachefs: implement filesystem shrinking mvp
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bcachefs: shrink: avoid holding two transactions at once
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bcachefs: alloc: directly check against target_nbuckets for skipping allocation
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bcachefs: remove unused buckets_nouse code
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bcachefs: shrink: print error message if reconcile scan fails
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bcachefs: shrink: close open buckets before evacuating data
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bcachefs: shrink: explicitly pass tail_cutoff instead of implicitly relying on ca->mi.target_nbuckets
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bcachefs: dev_resize_alloc: cast new - old buckets calculation to signed integer
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bcachefs: shrink: truncate alloc info
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bcachefs: shrink: run disk accounting
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bcachefs: shrink: disk accounting: properly handle negative changes
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bcachefs: shrink: truncate alloc: remove spurious dev_usage_remove call
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bcachefs: shrink: drop references to cutoff superblock copies
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bcachefs: shrink: mark superblock buckets as metadata
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bcachefs: shrink: use the same usage_remove path as dev_remove
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bcachefs: shrink: convert new nbuckets to little-endian before writing to superblock
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bcachefs: shrink: use alloc info to update accounting
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bcachefs: shrink: add comment about data being left as cached
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bcachefs: shrink: drop cached data after shrink cutoff
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bcachefs: shrink: remove unnecessary sb metadata marking
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bcachefs: shrink: flush journal
jullanggit
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Commits on Apr 19, 2026

Commits on Apr 20, 2026

Commits on Jun 24, 2026

Commits on Jun 28, 2026

bcachefs: shrink: address review cleanups

Komzpa
authored and
jullanggit
committed

Commits on Jun 29, 2026

Commits on Jul 1, 2026