From 46583e2597af649f134462d2f2c1be5e6689198d Mon Sep 17 00:00:00 2001
From: Benny Halevy <bhalevy@panasas.com>
Date: Wed, 12 May 2010 00:13:29 +0300
Subject: [PATCH] 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>
---
fs/nfsd/nfs4state.c | 4 +++-
fs/nfsd/state.h | 2 ++
2 files changed, 5 insertions(+), 1 deletion(-)
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index dede43c37336..e439a882e0c2 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -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);
diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 98836fd87f69..ee42a0beecfa 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -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 */