add a bvec_phys helper v3

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Hi Jens,

this series adds a bvec_phys helper to get the physical address
of a bio_vec so that callers don't have to poke into bvec internals.
There aren't a whole lot of user of it yet, but with the new proposed
DMA mapping API we might grow a lot more soon.

Changes since v2:
 - keep the existing (somewhat weird) description of get_max_segment_size

Changes since v1:
 - reorder the two patches as suggested by Geert
 - fix a comment typo
 - use PFN_PHYS instead of open coding it
 - also pass a len argument to get_max_segment_size instead of open
   coding a min in both callers

Diffstat:
 arch/m68k/emu/nfblock.c |    2 +-
 block/bio.c             |    2 +-
 block/blk-merge.c       |   25 +++++++++++--------------
 block/blk.h             |    4 ++--
 include/linux/bvec.h    |   14 ++++++++++++++
 5 files changed, 29 insertions(+), 18 deletions(-)




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