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bcachefs: RESERVE_stripe

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Rework stripe creation path - new algorithm for deciding when to create
new stripes or reuse existing stripes.

We add a new allocation watermark, RESERVE_stripe, above RESERVE_none.
Then we always try to create a new stripe by doing RESERVE_stripe
allocations; if this fails, we reuse an existing stripe and allocate
buckets for it with the reserve watermark for the given write
(RESERVE_none or RESERVE_movinggc).

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-03-02 01:54:17 -05:00
commit e84face6f0
5 changed files with 60 additions and 22 deletions
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