btrfs: make zstd memory requirements monotonic

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It is possible based on the level configurations that a higher level
workspace uses less memory than a lower level workspace. In order to
reuse workspaces, this must be made a monotonic relationship. This
precomputes the required memory for each level and enforces the
monotonicity between level and memory required. This is also done
in upstream zstd in [1].

[1] a68b76afef

Cc: Nick Terrell <terrelln@fb.com>
Signed-off-by: Dennis Zhou <dennis@kernel.org>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Dennis Zhou 2019-02-04 15:20:07 -05:00 • committed by David Sterba

parent e0dc87afcd

commit d3c6ab752c

1 changed files with 33 additions and 5 deletions

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fs/btrfs/zstd.c

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