ANDROID: fuse-bpf: add bpf solution for splice read
filemap_splice_read is implemented through readahead and read_folio,
which results in sending fuse-bpf files to FuseDaemon.
When a backing file exists, redirect the splice read to the lowlevel
filesystem.
Bug: 337714402
Signed-off-by:
Ed Tsai <ed.tsai@mediatek.com>
Change-Id: Ic22ad18a770fdf6911b2b13483b099da51edab10
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