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NFSv4/pNFS: Always allow update of a zero valued layout barrier

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A zero value for the layout barrier indicates that it has been cleared
(since seqid '0' is an illegal value), so we should always allow it to
be updated.

Fixes: d29b468da4 ("pNFS/NFSv4: Improve rejection of out-of-order layouts")
Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2021-07-23 08:57:20 -04:00 committed by Anna Schumaker
parent 7c0bbf2d3d
commit 45baadaad7
1 changed files with 1 additions and 1 deletions
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2
fs/nfs/pnfs.c
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@ -335,7 +335,7 @@ static bool pnfs_seqid_is_newer(u32 s1, u32 s2)
static void pnfs_barrier_update(struct pnfs_layout_hdr *lo, u32 newseq)
{
if (pnfs_seqid_is_newer(newseq, lo->plh_barrier))
if (pnfs_seqid_is_newer(newseq, lo->plh_barrier) || !lo->plh_barrier)
lo->plh_barrier = newseq;
}