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

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[ Upstream commit 45baadaad7bf9183651fb74f4ed1200da48505a5 ]

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: d29b468da4f9 ("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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Trond Myklebust 2021-07-23 08:57:20 -04:00 committed by Greg Kroah-Hartman
parent 4b96edea5c
commit 2a542421eb
1 changed files with 1 additions and 1 deletions
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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;
}