tree c794857eb5c3ca29f77e259ecd3c155f841134d1
parent b57ff1303a2d4d1484c7a82bd80a3e014d6cdf5e
author Weston Andros Adamson <dros@primarydata.com> 1411138507 -0400
committer Tom Haynes <loghyr@primarydata.com> 1422990405 -0800

nfs: add mirroring support to pgio layer

This patch adds mirrored write support to the pgio layer. The default
is to use one mirror, but pgio callers may define callbacks to change
this to any value up to the (arbitrarily selected) limit of 16.

The basic idea is to break out members of nfs_pageio_descriptor that cannot
be shared between mirrored DSes and put them in a new structure.

Signed-off-by: Weston Andros Adamson <dros@primarydata.com>