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nfsd: make sessionid_hashtbl allocated per net 

This hash holds established sessions state and closely associated with
nfs4_clients info, which are network namespace aware. So let's make it
allocated per network namespace too.

Note: this hash can be allocated in per-net operations. But it looks
better to allocate it on nfsd state start and thus don't waste resources
if server is not running.

Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
This commit is contained in:
Stanislav Kinsbursky 2012-11-14 18:21:51 +03:00 committed by J. Bruce Fields
parent 20e9e2bc98
commit 1872de0e81
2 changed files with 20 additions and 11 deletions
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3
fs/nfsd/netns.h
View File

@ -32,6 +32,8 @@
#define LOCKOWNER_INO_HASH_BITS 8
#define LOCKOWNER_INO_HASH_SIZE (1 << LOCKOWNER_INO_HASH_BITS)
#define SESSION_HASH_SIZE 512
struct cld_net;
struct nfsd_net {
@ -65,6 +67,7 @@ struct nfsd_net {
struct rb_root unconf_name_tree;
struct list_head *ownerstr_hashtbl;
struct list_head *lockowner_ino_hashtbl;
struct list_head *sessionid_hashtbl;
};
extern int nfsd_net_id;

28
fs/nfsd/nfs4state.c
View File

@ -632,9 +632,6 @@ static void release_openowner(struct nfs4_openowner *oo)
nfs4_free_openowner(oo);
}
#define SESSION_HASH_SIZE 512
static struct list_head sessionid_hashtbl[SESSION_HASH_SIZE];
static inline int
hash_sessionid(struct nfs4_sessionid *sessionid)
{
@ -928,6 +925,7 @@ static struct nfsd4_session *alloc_session(struct nfsd4_channel_attrs *fchan)
static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, struct nfs4_client *clp, struct nfsd4_create_session *cses)
{
int idx;
struct nfsd_net *nn = net_generic(SVC_NET(rqstp), nfsd_net_id);
new->se_client = clp;
gen_sessionid(new);
@ -941,7 +939,7 @@ static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, stru
kref_init(&new->se_ref);
idx = hash_sessionid(&new->se_sessionid);
spin_lock(&client_lock);
list_add(&new->se_hash, &sessionid_hashtbl[idx]);
list_add(&new->se_hash, &nn->sessionid_hashtbl[idx]);
spin_lock(&clp->cl_lock);
list_add(&new->se_perclnt, &clp->cl_sessions);
spin_unlock(&clp->cl_lock);
@ -963,15 +961,16 @@ static void init_session(struct svc_rqst *rqstp, struct nfsd4_session *new, stru
/* caller must hold client_lock */
static struct nfsd4_session *
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid)
find_in_sessionid_hashtbl(struct nfs4_sessionid *sessionid, struct net *net)
{
struct nfsd4_session *elem;
int idx;
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
dump_sessionid(__func__, sessionid);
idx = hash_sessionid(sessionid);
/* Search in the appropriate list */
list_for_each_entry(elem, &sessionid_hashtbl[idx], se_hash) {
list_for_each_entry(elem, &nn->sessionid_hashtbl[idx], se_hash) {
if (!memcmp(elem->se_sessionid.data, sessionid->data,
NFS4_MAX_SESSIONID_LEN)) {
return elem;
@ -1905,7 +1904,7 @@ __be32 nfsd4_bind_conn_to_session(struct svc_rqst *rqstp,
if (!nfsd4_last_compound_op(rqstp))
return nfserr_not_only_op;
spin_lock(&client_lock);
cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid);
cstate->session = find_in_sessionid_hashtbl(&bcts->sessionid, SVC_NET(rqstp));
/* Sorta weird: we only need the refcnt'ing because new_conn acquires
* client_lock iself: */
if (cstate->session) {
@ -1954,7 +1953,7 @@ nfsd4_destroy_session(struct svc_rqst *r,
}
dump_sessionid(__func__, &sessionid->sessionid);
spin_lock(&client_lock);
ses = find_in_sessionid_hashtbl(&sessionid->sessionid);
ses = find_in_sessionid_hashtbl(&sessionid->sessionid, SVC_NET(r));
if (!ses) {
spin_unlock(&client_lock);
goto out;
@ -2050,7 +2049,7 @@ nfsd4_sequence(struct svc_rqst *rqstp,
spin_lock(&client_lock);
status = nfserr_badsession;
session = find_in_sessionid_hashtbl(&seq->sessionid);
session = find_in_sessionid_hashtbl(&seq->sessionid, SVC_NET(rqstp));
if (!session)
goto out;
@ -4719,8 +4718,6 @@ nfs4_state_init(void)
{
int i;
for (i = 0; i < SESSION_HASH_SIZE; i++)
INIT_LIST_HEAD(&sessionid_hashtbl[i]);
for (i = 0; i < FILE_HASH_SIZE; i++) {
INIT_LIST_HEAD(&file_hashtbl[i]);
}
@ -4771,6 +4768,10 @@ static int nfs4_state_start_net(struct net *net)
LOCKOWNER_INO_HASH_SIZE, GFP_KERNEL);
if (!nn->lockowner_ino_hashtbl)
goto err_lockowner_ino;
nn->sessionid_hashtbl = kmalloc(sizeof(struct list_head) *
SESSION_HASH_SIZE, GFP_KERNEL);
if (!nn->sessionid_hashtbl)
goto err_sessionid;
for (i = 0; i < CLIENT_HASH_SIZE; i++) {
INIT_LIST_HEAD(&nn->conf_id_hashtbl[i]);
@ -4780,11 +4781,15 @@ static int nfs4_state_start_net(struct net *net)
INIT_LIST_HEAD(&nn->ownerstr_hashtbl[i]);
for (i = 0; i < LOCKOWNER_INO_HASH_SIZE; i++)
INIT_LIST_HEAD(&nn->lockowner_ino_hashtbl[i]);
for (i = 0; i < SESSION_HASH_SIZE; i++)
INIT_LIST_HEAD(&nn->sessionid_hashtbl[i]);
nn->conf_name_tree = RB_ROOT;
nn->unconf_name_tree = RB_ROOT;
return 0;
err_sessionid:
kfree(nn->lockowner_ino_hashtbl);
err_lockowner_ino:
kfree(nn->ownerstr_hashtbl);
err_ownerstr:
@ -4819,6 +4824,7 @@ __nfs4_state_shutdown_net(struct net *net)
destroy_client(clp);
}
kfree(nn->sessionid_hashtbl);
kfree(nn->lockowner_ino_hashtbl);
kfree(nn->ownerstr_hashtbl);
kfree(nn->unconf_id_hashtbl);