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nfsd: fix race to check ls_layouts

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[ Upstream commit fb610c4dbc996415d57d7090957ecddd4fd64fb6 ]

Its possible for __break_lease to find the layout's lease before we've
added the layout to the owner's ls_layouts list.  In that case, setting
ls_recalled = true without actually recalling the layout will cause the
server to never send a recall callback.

Move the check for ls_layouts before setting ls_recalled.

Fixes: c5c707f96f ("nfsd: implement pNFS layout recalls")
Signed-off-by: Benjamin Coddington <bcodding@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Benjamin Coddington 2023-01-27 11:18:56 -05:00 • committed by Greg Kroah-Hartman
commit a22f1ecab6
1 changed files with 2 additions and 2 deletions
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4
fs/nfsd/nfs4layouts.c
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@ -322,11 +322,11 @@ nfsd4_recall_file_layout(struct nfs4_layout_stateid *ls)
if (ls->ls_recalled)
goto out_unlock;
ls->ls_recalled = true;
atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
if (list_empty(&ls->ls_layouts))
goto out_unlock;
ls->ls_recalled = true;
atomic_inc(&ls->ls_stid.sc_file->fi_lo_recalls);
trace_nfsd_layout_recall(&ls->ls_stid.sc_stateid);
refcount_inc(&ls->ls_stid.sc_count);