Ilya Dryomov 187df76325
libceph: fix breakage caused by multipage bvecs ...
A bvec can now consist of multiple physically contiguous pages.
This means that bvec_iter_advance() can move to a different page while
staying in the same bvec (i.e. ->bi_bvec_done != 0).
The messenger works in terms of segments which can now be defined as
the smaller of a bvec and a page. The "more bytes to process in this
segment" condition holds only if bvec_iter_advance() leaves us in the
same bvec _and_ in the same page. On next bvec (possibly in the same
page) and on next page (possibly in the same bvec) we may need to set
->last_piece.
Signed-off-by: Ilya Dryomov <idryomov@gmail.com >
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187df76325