commit 5fadeb47dcc5c30d4b6cf481b4a78689eab59443
author Peng Tao <tao.peng@primarydata.com> Mon Jan 19 12:41:16 2015 +0800
committer Tom Haynes <loghyr@primarydata.com> Tue Feb 03 11:06:52 2015 -0800
tree 61144dbb7c04d5ddae49174c122ef1c686712b06
parent aa8a45ee974dfe3ffe290daaf5db457afae56fde

nfs: count DIO good bytes correctly with mirroring

When resending to MDS, we might resend multiple mirroring
requests to MDS. As a result, nfs_direct_good_bytes() ends
up counting bytes multiple times, causing application to
get wrong return results in read/write syscalls.

Fix it by tracking start of a dreq and checking the range of
pgio header.

Cc: Weston Andros Adamson <dros@primarydata.com>
Signed-off-by: Peng Tao <tao.peng@primarydata.com>