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NFSD: send OP_CB_RECALL_ANY to clients when number of delegations reaches its limit 

The NFS server should ask clients to voluntarily return unused
delegations when the number of granted delegations reaches the
max_delegations. This is so that the server can continue to
grant delegations for new requests.

Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Tested-by: Chen Hanxiao <chenhx.fnst@fujitsu.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
This commit is contained in:
Dai Ngo 2024-03-03 14:23:02 -08:00 committed by Chuck Lever
parent 7d5a352ccc
commit bad4c585cc
1 changed files with 3 additions and 0 deletions
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3
fs/nfsd/nfs4state.c
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@ -87,6 +87,7 @@ static void nfs4_free_ol_stateid(struct nfs4_stid *stid);
void nfsd4_end_grace(struct nfsd_net *nn);
static void _free_cpntf_state_locked(struct nfsd_net *nn, struct nfs4_cpntf_state *cps);
static void nfsd4_file_hash_remove(struct nfs4_file *fi);
static void deleg_reaper(struct nfsd_net *nn);
/* Locking: */
@ -6550,6 +6551,8 @@ nfs4_laundromat(struct nfsd_net *nn)
/* service the server-to-server copy delayed unmount list */
nfsd4_ssc_expire_umount(nn);
#endif
if (atomic_long_read(&num_delegations) >= max_delegations)
deleg_reaper(nn);
out:
return max_t(time64_t, lt.new_timeo, NFSD_LAUNDROMAT_MINTIMEOUT);
}