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2c4656dfd9
a) Dirty cache needs to be written back not just in the writeback_cache
case, since the dirty pages may come from memory maps.
b) The fuse_writeback_range() helper takes an inclusive interval, so the
end position needs to be pos+len-1 instead of pos+len.
Fixes: 88bc7d5097 ("fuse: add support for copy_file_range()")
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>