add and use a per-mapping stable writes flag

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Hi all

A while ago Ilya pointer out that since commit 1cb039f3dc16 ("bdi:
replace BDI_CAP_STABLE_WRITES with a queue and a sb flag"), the stable
write flag on the queue wasn't used for writes to the block devices
nodes any more, and willy suggested fixing this by adding a stable write
flags on each address_space.  This series implements this fix, and also
fixes the stable write flag when the XFS RT device requires it, but the
main device doesn't (which is probably more a theoretical than a
practical problem).

Diffstat:
 block/bdev.c            |    2 ++
 fs/inode.c              |    2 ++
 fs/xfs/xfs_inode.h      |    8 ++++++++
 fs/xfs/xfs_ioctl.c      |    9 +++++++++
 fs/xfs/xfs_iops.c       |    7 +++++++
 include/linux/pagemap.h |   17 +++++++++++++++++
 mm/page-writeback.c     |    2 +-
 7 files changed, 46 insertions(+), 1 deletion(-)




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