affs: convert data read and write to use folios

We still need to convert to/from folios in write_begin & write_end to fit
the API, but this removes a lot of calls to old page-based functions,
removing many hidden calls to compound_head().

Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Matthew Wilcox (Oracle) <[email protected]>
Reviewed-by: Pankaj Raghav <[email protected]>
Acked-by: David Sterba <[email protected]>
Cc: Alexander Viro <[email protected]>
Cc: Christian Brauner <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: Konstantin Komarov <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Nick Desaulniers <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Tom Rix <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>

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