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authorTrond Myklebust <Trond.Myklebust@netapp.com>2013-09-26 14:32:56 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2013-09-29 15:58:35 -0400
commitacd65e5bc1986d0089efec3fe63e52ea0c406d6d (patch)
tree69f3ed1d96d708b4b927ed40228a4813c666b88a /fs
parent52b26a3e1bb3e065c32b3febdac1e1f117d88e15 (diff)
downloadop-kernel-dev-acd65e5bc1986d0089efec3fe63e52ea0c406d6d.zip
op-kernel-dev-acd65e5bc1986d0089efec3fe63e52ea0c406d6d.tar.gz
NFSv4.1: Ensure memory ordering between nfs4_ds_connect and nfs4_fl_prepare_ds
We need to ensure that the initialisation of the data server nfs_client structure in nfs4_ds_connect is correctly ordered w.r.t. the read of ds->ds_clp in nfs4_fl_prepare_ds. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/nfs/nfs4filelayoutdev.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nfs/nfs4filelayoutdev.c b/fs/nfs/nfs4filelayoutdev.c
index cd3aef5..c7c295e5 100644
--- a/fs/nfs/nfs4filelayoutdev.c
+++ b/fs/nfs/nfs4filelayoutdev.c
@@ -185,6 +185,7 @@ nfs4_ds_connect(struct nfs_server *mds_srv, struct nfs4_pnfs_ds *ds)
if (status)
goto out_put;
+ smp_wmb();
ds->ds_clp = clp;
dprintk("%s [new] addr: %s\n", __func__, ds->ds_remotestr);
out:
@@ -809,6 +810,7 @@ nfs4_fl_prepare_ds(struct pnfs_layout_segment *lseg, u32 ds_idx)
filelayout_mark_devid_invalid(devid);
goto out;
}
+ smp_rmb();
if (ds->ds_clp)
goto out_test_devid;
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