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NFSv41: fix DIO write_io calculation 

pnfs_within_mdsthreshold() is called inside pg_init. We need to set
read_io/write_io before that. Otherwise we fail pnfs_within_mdsthreshold()
and IO goes to MDS.
A simple test case:
dd if=foo of=/mnt/pnfs/bar bs=10M count=1 oflag=direct

Signed-off-by: Peng Tao <tao.peng@emc.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Peng Tao 2012-08-24 00:27:48 +08:00 committed by Trond Myklebust
parent 6f2ea7f2a3
commit 7acdb02681
1 changed files with 2 additions and 2 deletions
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4
fs/nfs/direct.c
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@ -467,10 +467,10 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
if (!is_sync_kiocb(iocb))
dreq->iocb = iocb;
NFS_I(inode)->read_io += iov_length(iov, nr_segs);
result = nfs_direct_read_schedule_iovec(dreq, iov, nr_segs, pos, uio);
if (!result)
result = nfs_direct_wait(dreq);
NFS_I(inode)->read_io += result;
out_release:
nfs_direct_req_release(dreq);
out:
@ -818,6 +818,7 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
get_dreq(dreq);
atomic_inc(&inode->i_dio_count);
NFS_I(dreq->inode)->write_io += iov_length(iov, nr_segs);
for (seg = 0; seg < nr_segs; seg++) {
const struct iovec *vec = &iov[seg];
result = nfs_direct_write_schedule_segment(&desc, vec, pos, uio);
@ -829,7 +830,6 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
pos += vec->iov_len;
}
nfs_pageio_complete(&desc);
NFS_I(dreq->inode)->write_io += desc.pg_bytes_written;
/*
* If no bytes were started, return the error, and let the