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Subject[PATCH 05/11] NFS: Fix NFSv4 callback regression
From: Trond Myklebust <Trond.Myklebust@netapp.com>

The change in semantics for nfs_find_client() introduced by David breaks
the NFSv4 callback channel.

Also, replace another completely broken BUG_ON() in nfs_find_client().
In initialised clients, clp->cl_cons_state == 0, and callers of that
function should in any case never want to see clients that are
uninitialised.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
---
fs/nfs/client.c | 19 ++++++++++++-------
1 files changed, 12 insertions(+), 7 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 8b123f6..5fea638 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -232,11 +232,15 @@ void nfs_put_client(struct nfs_client *c
* Find a client by address
* - caller must hold nfs_client_lock
*/
-static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion)
+static struct nfs_client *__nfs_find_client(const struct sockaddr_in *addr, int nfsversion, int match_port)
{
struct nfs_client *clp;

list_for_each_entry(clp, &nfs_client_list, cl_share_link) {
+ /* Don't match clients that failed to initialise properly */
+ if (clp->cl_cons_state < 0)
+ continue;
+
/* Different NFS versions cannot share the same nfs_client */
if (clp->cl_nfsversion != nfsversion)
continue;
@@ -245,7 +249,7 @@ static struct nfs_client *__nfs_find_cli
sizeof(clp->cl_addr.sin_addr)) != 0)
continue;

- if (clp->cl_addr.sin_port == addr->sin_port)
+ if (!match_port || clp->cl_addr.sin_port == addr->sin_port)
goto found;
}

@@ -265,11 +269,12 @@ struct nfs_client *nfs_find_client(const
struct nfs_client *clp;

spin_lock(&nfs_client_lock);
- clp = __nfs_find_client(addr, nfsversion);
+ clp = __nfs_find_client(addr, nfsversion, 0);
spin_unlock(&nfs_client_lock);
-
- BUG_ON(clp && clp->cl_cons_state == 0);
-
+ if (clp != NULL && clp->cl_cons_state != NFS_CS_READY) {
+ nfs_put_client(clp);
+ clp = NULL;
+ }
return clp;
}

@@ -292,7 +297,7 @@ static struct nfs_client *nfs_get_client
do {
spin_lock(&nfs_client_lock);

- clp = __nfs_find_client(addr, nfsversion);
+ clp = __nfs_find_client(addr, nfsversion, 1);
if (clp)
goto found_client;
if (new)
-
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