NFSv4/pnfs: The layout barrier indicate a minimal value for the seqid

[ Upstream commit d6236a98b3bab07c0a1455fd1ab46f79c3978cdc ]

The intention of the layout barrier is to ensure that we do not update
the layout to match an older value than the current expectation. Fix the
test in pnfs_layout_stateid_blocked() to reflect that it is legal for
the seqid of the stateid to match that of the barrier.

Fixes: aa95edf309ef ("NFSv4/pnfs: Fix the layout barrier update")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 741b628..5370e08 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1004,7 +1004,7 @@ pnfs_layout_stateid_blocked(const struct pnfs_layout_hdr *lo,
 {
        u32 seqid = be32_to_cpu(stateid->seqid);
 
-       return !pnfs_seqid_is_newer(seqid, lo->plh_barrier) && lo->plh_barrier;
+       return lo->plh_barrier && pnfs_seqid_is_newer(lo->plh_barrier, seqid);
 }
 
 /* lget is set to 1 if called from inside send_layoutget call chain */