btrfs: add manual PSI accounting for compressed reads
btrfs compressed reads try to always read the entire compressed chunk, even if only a subset is requested. Currently this is covered by the magic PSI accounting underneath submit_bio, but that is about to go away. Instead add manual psi_memstall_{enter,leave} annotations. Note that for readahead this really should be using readahead_expand, but the additionals reads are also done for plain ->read_folio where readahead_expand can't work, so this overall logic is left as-is for now. Signed-off-by:Christoph Hellwig <hch@lst.de> Acked-by:
David Sterba <dsterba@suse.com> Acked-by:
Johannes Weiner <hannes@cmpxchg.org> Link: https://lore.kernel.org/r/20220915094200.139713-4-hch@lst.de Signed-off-by:
Jens Axboe <axboe@kernel.dk>
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