#include <linux/file.h>
#include <linux/smp_lock.h>
+#include <linux/slab.h>
#include <linux/namei.h>
#include <linux/swap.h>
#include <linux/sunrpc/svcauth_gss.h>
* SETCLIENTID state
*/
+/* client_lock protects the client lru list and session hash table */
+static DEFINE_SPINLOCK(client_lock);
+
/* Hash tables for nfs4_clientid state */
#define CLIENT_HASH_BITS 4
#define CLIENT_HASH_SIZE (1 << CLIENT_HASH_BITS)
nfs4_put_stateowner(sop);
}
-static DEFINE_SPINLOCK(sessionid_lock);
#define SESSION_HASH_SIZE 512
static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
new->se_flags = cses->flags;
kref_init(&new->se_ref);
- spin_lock(&sessionid_lock);
+ spin_lock(&client_lock);
list_add(&new->se_hash, &sessionid_hashtbl[idx]);
list_add(&new->se_perclnt, &clp->cl_sessions);
- spin_unlock(&sessionid_lock);
+ spin_unlock(&client_lock);
status = nfs_ok;
out:
goto out;
}
-/* caller must hold sessionid_lock */
+/* caller must hold client_lock */
static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
{
return NULL;
}
-/* caller must hold sessionid_lock */
+/* caller must hold client_lock */
static void
unhash_session(struct nfsd4_session *ses)
{
list_del(&ses->se_perclnt);
}
-static void
-release_session(struct nfsd4_session *ses)
-{
- spin_lock(&sessionid_lock);
- unhash_session(ses);
- spin_unlock(&sessionid_lock);
- nfsd4_put_session(ses);
-}
-
void
free_session(struct kref *kref)
{
kfree(ses);
}
+/* must be called under the client_lock */
static inline void
-renew_client(struct nfs4_client *clp)
+renew_client_locked(struct nfs4_client *clp)
{
+ if (is_client_expired(clp)) {
+ dprintk("%s: client (clientid %08x/%08x) already expired\n",
+ __func__,
+ clp->cl_clientid.cl_boot,
+ clp->cl_clientid.cl_id);
+ return;
+ }
+
/*
* Move client to the end to the LRU list.
*/
clp->cl_time = get_seconds();
}
+static inline void
+renew_client(struct nfs4_client *clp)
+{
+ spin_lock(&client_lock);
+ renew_client_locked(clp);
+ spin_unlock(&client_lock);
+}
+
/* SETCLIENTID and SETCLIENTID_CONFIRM Helper functions */
static int
STALE_CLIENTID(clientid_t *clid)
kfree(clp);
}
+/* must be called under the client_lock */
+static inline void
+unhash_client_locked(struct nfs4_client *clp)
+{
+ mark_client_expired(clp);
+ list_del(&clp->cl_lru);
+ while (!list_empty(&clp->cl_sessions)) {
+ struct nfsd4_session *ses;
+ ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
+ se_perclnt);
+ unhash_session(ses);
+ nfsd4_put_session(ses);
+ }
+}
+
static void
expire_client(struct nfs4_client *clp)
{
list_del_init(&dp->dl_recall_lru);
unhash_delegation(dp);
}
- list_del(&clp->cl_idhash);
- list_del(&clp->cl_strhash);
- list_del(&clp->cl_lru);
while (!list_empty(&clp->cl_openowners)) {
sop = list_entry(clp->cl_openowners.next, struct nfs4_stateowner, so_perclient);
release_openowner(sop);
}
- while (!list_empty(&clp->cl_sessions)) {
- struct nfsd4_session *ses;
- ses = list_entry(clp->cl_sessions.next, struct nfsd4_session,
- se_perclnt);
- release_session(ses);
- }
nfsd4_set_callback_client(clp, NULL);
if (clp->cl_cb_conn.cb_xprt)
svc_xprt_put(clp->cl_cb_conn.cb_xprt);
- free_client(clp);
+ list_del(&clp->cl_idhash);
+ 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);
}
static void copy_verf(struct nfs4_client *target, nfs4_verifier *source)
}
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);
INIT_LIST_HEAD(&clp->cl_delegations);
INIT_LIST_HEAD(&clp->cl_sessions);
INIT_LIST_HEAD(&clp->cl_lru);
+ clp->cl_time = get_seconds();
clear_bit(0, &clp->cl_cb_slot_busy);
rpc_init_wait_queue(&clp->cl_cb_waitq, "Backchannel slot table");
copy_verf(clp, verf);
list_add(&clp->cl_strhash, &unconf_str_hashtbl[strhashval]);
idhashval = clientid_hashval(clp->cl_clientid.cl_id);
list_add(&clp->cl_idhash, &unconf_id_hashtbl[idhashval]);
- list_add_tail(&clp->cl_lru, &client_lru);
- clp->cl_time = get_seconds();
+ renew_client(clp);
}
static void
unsigned int strhashval;
dprintk("NFSD: move_to_confirm nfs4_client %p\n", clp);
- list_del_init(&clp->cl_strhash);
list_move(&clp->cl_idhash, &conf_id_hashtbl[idhashval]);
strhashval = clientstr_hashval(clp->cl_recdir);
- list_add(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
+ list_move(&clp->cl_strhash, &conf_str_hashtbl[strhashval]);
renew_client(clp);
}
return status;
}
+static bool nfsd4_last_compound_op(struct svc_rqst *rqstp)
+{
+ struct nfsd4_compoundres *resp = rqstp->rq_resp;
+ struct nfsd4_compoundargs *argp = rqstp->rq_argp;
+
+ return argp->opcnt == resp->opcnt;
+}
+
+static bool nfsd4_compound_in_session(struct nfsd4_session *session, struct nfs4_sessionid *sid)
+{
+ if (!session)
+ return 0;
+ return !memcmp(sid, &session->se_sessionid, sizeof(*sid));
+}
+
__be32
nfsd4_destroy_session(struct svc_rqst *r,
struct nfsd4_compound_state *cstate,
* - Do we need to clear any callback info from previous session?
*/
+ if (nfsd4_compound_in_session(cstate->session, &sessionid->sessionid)) {
+ if (!nfsd4_last_compound_op(r))
+ return nfserr_not_only_op;
+ }
dump_sessionid(__func__, &sessionid->sessionid);
- spin_lock(&sessionid_lock);
+ spin_lock(&client_lock);
ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
if (!ses) {
- spin_unlock(&sessionid_lock);
+ spin_unlock(&client_lock);
goto out;
}
unhash_session(ses);
- spin_unlock(&sessionid_lock);
+ spin_unlock(&client_lock);
/* wait for callbacks */
nfsd4_set_callback_client(ses->se_client, NULL);
if (resp->opcnt != 1)
return nfserr_sequence_pos;
- spin_lock(&sessionid_lock);
+ spin_lock(&client_lock);
status = nfserr_badsession;
session = find_in_sessionid_hashtbl(&seq->sessionid);
if (!session)
cstate->slot = slot;
cstate->session = session;
- /* Hold a session reference until done processing the compound:
- * nfsd4_put_session called only if the cstate slot is set.
- */
- nfsd4_get_session(session);
out:
- spin_unlock(&sessionid_lock);
- /* Renew the clientid on success and on replay */
+ /* Hold a session reference until done processing the compound. */
if (cstate->session) {
- nfs4_lock_state();
- renew_client(session->se_client);
- nfs4_unlock_state();
+ nfsd4_get_session(cstate->session);
+ /* Renew the clientid on success and on replay */
+ renew_client_locked(session->se_client);
}
+ spin_unlock(&client_lock);
dprintk("%s: return %d\n", __func__, ntohl(status));
return status;
}
dprintk("NFSD: laundromat service - starting\n");
if (locks_in_grace())
nfsd4_end_grace();
+ INIT_LIST_HEAD(&reaplist);
+ spin_lock(&client_lock);
list_for_each_safe(pos, next, &client_lru) {
clp = list_entry(pos, struct nfs4_client, cl_lru);
if (time_after((unsigned long)clp->cl_time, (unsigned long)cutoff)) {
clientid_val = t;
break;
}
+ list_move(&clp->cl_lru, &reaplist);
+ }
+ spin_unlock(&client_lock);
+ list_for_each_safe(pos, next, &reaplist) {
+ clp = list_entry(pos, struct nfs4_client, cl_lru);
dprintk("NFSD: purging unused client (clientid %08x)\n",
clp->cl_clientid.cl_id);
nfsd4_remove_clid_dir(clp);
expire_client(clp);
}
- INIT_LIST_HEAD(&reaplist);
spin_lock(&recall_lock);
list_for_each_safe(pos, next, &del_recall_lru) {
dp = list_entry (pos, struct nfs4_delegation, dl_recall_lru);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff