pnfs: pass ds_commit_idx through the commit path

Pass ds_commit_idx through the nfs commit path. It's used to select
the commit bucket when using pnfs and is ignored when not using pnfs.
Several functions had to be changed: nfs_retry_commit,
nfs_mark_request_commit, pnfs_mark_request_commit and the pnfs layout
driver .mark_request_commit functions.

Signed-off-by: Tom Haynes <loghyr@primarydata.com>

diff --cc fs/nfs/direct.c
Simple merge

diff --cc fs/nfs/filelayout/filelayout.c
Simple merge

diff --cc fs/nfs/internal.h
Simple merge

diff --cc fs/nfs/pnfs.h
Simple merge

diff --cc fs/nfs/pnfs_nfs.c
Simple merge

diff --cc fs/nfs/write.c
Simple merge