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Implement the helpers for the new write code in 9p. There's now an optional ->prepare_write() that allows the filesystem to set the parameters for the next write, such as maximum size and maximum segment count, and an ->issue_write() that is called to initiate an (asynchronous) write operation. Signed-off-by: David Howells <[email protected]> Reviewed-by: Jeff Layton <[email protected]> cc: Eric Van Hensbergen <[email protected]> cc: Latchesar Ionkov <[email protected]> cc: Dominique Martinet <[email protected]> cc: Christian Schoenebeck <[email protected]> cc: [email protected] cc: [email protected] cc: [email protected]