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nfsd4: introduce nfs4_client.cl_refcount 

Currently just initialize the cl_refcount to 1
and decrement in expire_client(), conditionally freeing the
client when the refcount reaches 0.

To be used later by nfsv4.1 compounds to keep the client from
timing out while in use.

Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
This commit is contained in:
Benny Halevy 2010-05-12 00:13:29 +03:00 committed by J. Bruce Fields
parent 84d38ac9ab
commit 46583e2597
2 changed files with 5 additions and 1 deletions
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4
fs/nfsd/nfs4state.c
View File

@ -740,8 +740,9 @@ expire_client(struct nfs4_client *clp)
list_del(&clp->cl_strhash);
spin_lock(&client_lock);
unhash_client_locked(clp);
if (atomic_read(&clp->cl_refcount) == 0)
free_client(clp);
spin_unlock(&client_lock);
free_client(clp);
}
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
@ -827,6 +828,7 @@ static struct nfs4_client *create_client(struct xdr_netobj name, char *recdir,
}
memcpy(clp->cl_recdir, recdir, HEXDIR_LEN);
atomic_set(&clp->cl_refcount, 0);
atomic_set(&clp->cl_cb_set, 0);
INIT_LIST_HEAD(&clp->cl_idhash);
INIT_LIST_HEAD(&clp->cl_strhash);

2
fs/nfsd/state.h
View File

@ -233,6 +233,8 @@ struct nfs4_client {
struct nfsd4_clid_slot cl_cs_slot; /* create_session slot */
u32 cl_exchange_flags;
struct nfs4_sessionid cl_sessionid;
/* number of rpc's in progress over an associated session: */
atomic_t cl_refcount;
/* for nfs41 callbacks */
/* We currently support a single back channel with a single slot */