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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-02-26 14:27:58 -0500
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-03-01 16:20:16 -0500
commit39a5201a2b450c2bf0447fb65305654c65f7f954 (patch)
treefca8d1037cf87934c2abf5c4185270652cf44bc8 /fs/nfs/pnfs_dev.c
parent762bb7e97351b37c6267509d5806b4c151250ab1 (diff)
NFSv4/pnfs: Fix barriers in nfs4_mark_deviceid_unavailable()
Fix the memory barriers in nfs4_mark_deviceid_unavailable() and nfs4_test_deviceid_unavailable(). Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Diffstat (limited to 'fs/nfs/pnfs_dev.c')
-rw-r--r--fs/nfs/pnfs_dev.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/nfs/pnfs_dev.c b/fs/nfs/pnfs_dev.c
index 7fb59487ee90..ec6b607ff1d7 100644
--- a/fs/nfs/pnfs_dev.c
+++ b/fs/nfs/pnfs_dev.c
@@ -287,7 +287,9 @@ void
nfs4_mark_deviceid_unavailable(struct nfs4_deviceid_node *node)
{
node->timestamp_unavailable = jiffies;
+ smp_mb__before_atomic();
set_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
+ smp_mb__after_atomic();
}
EXPORT_SYMBOL_GPL(nfs4_mark_deviceid_unavailable);
@@ -302,6 +304,7 @@ nfs4_test_deviceid_unavailable(struct nfs4_deviceid_node *node)
if (time_in_range(node->timestamp_unavailable, start, end))
return true;
clear_bit(NFS_DEVICEID_UNAVAILABLE, &node->flags);
+ smp_mb__after_atomic();
}
return false;
}