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Commit c0177628 authored by Benjamin Coddington's avatar Benjamin Coddington Committed by Anna Schumaker
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NFSv4/pNFS: Fix a race to wake on NFS_LAYOUT_DRAIN



We found a few different systems hung up in writeback waiting on the same
page lock, and one task waiting on the NFS_LAYOUT_DRAIN bit in
pnfs_update_layout(), however the pnfs_layout_hdr's plh_outstanding count
was zero.

It seems most likely that this is another race between the waiter and waker
similar to commit ed0172af ("SUNRPC: Fix a race to wake a sync task").
Fix it up by applying the advised barrier.

Fixes: 880265c7 ("pNFS: Avoid a live lock condition in pnfs_update_layout()")
Signed-off-by: default avatarBenjamin Coddington <bcodding@redhat.com>
Signed-off-by: default avatarAnna Schumaker <anna.schumaker@oracle.com>
parent e8d6f3ab
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