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authorLinus Torvalds <torvalds@linux-foundation.org>2012-01-14 12:26:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2012-01-14 12:26:41 -0800
commit0b48d42235caf627121f440b57d376f48a9af8b6 (patch)
tree400967c5fcb1cd08bbc0e1739e229f9717590f19 /net
parent8e63dd6e1c589ba99a18df9cbaa41c3178607641 (diff)
parent7a6ef8c72314f254c107c6a9ed7cb201961ee05a (diff)
downloadlinux-linaro-stable-0b48d42235caf627121f440b57d376f48a9af8b6.tar.gz
Merge branch 'for-3.3' of git://linux-nfs.org/~bfields/linux
* 'for-3.3' of git://linux-nfs.org/~bfields/linux: (31 commits) nfsd4: nfsd4_create_clid_dir return value is unused NFSD: Change name of extended attribute containing junction svcrpc: don't revert to SVC_POOL_DEFAULT on nfsd shutdown svcrpc: fix double-free on shutdown of nfsd after changing pool mode nfsd4: be forgiving in the absence of the recovery directory nfsd4: fix spurious 4.1 post-reboot failures NFSD: forget_delegations should use list_for_each_entry_safe NFSD: Only reinitilize the recall_lru list under the recall lock nfsd4: initialize special stateid's at compile time NFSd: use network-namespace-aware cache registering routines SUNRPC: create svc_xprt in proper network namespace svcrpc: update outdated BKL comment nfsd41: allow non-reclaim open-by-fh's in 4.1 svcrpc: avoid memory-corruption on pool shutdown svcrpc: destroy server sockets all at once svcrpc: make svc_delete_xprt static nfsd: Fix oops when parsing a 0 length export nfsd4: Use kmemdup rather than duplicating its implementation nfsd4: add a separate (lockowner, inode) lookup nfsd4: fix CONFIG_NFSD_FAULT_INJECTION compile error ...
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/cache.c2
-rw-r--r--net/sunrpc/svc.c25
-rw-r--r--net/sunrpc/svc_xprt.c62
-rw-r--r--net/sunrpc/svcsock.c8
-rw-r--r--net/sunrpc/xprtrdma/svc_rdma_transport.c2
5 files changed, 64 insertions, 35 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 03b56bc3b659..465df9ae1046 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -1641,6 +1641,7 @@ int cache_register_net(struct cache_detail *cd, struct net *net)
sunrpc_destroy_cache_detail(cd);
return ret;
}
+EXPORT_SYMBOL_GPL(cache_register_net);
int cache_register(struct cache_detail *cd)
{
@@ -1653,6 +1654,7 @@ void cache_unregister_net(struct cache_detail *cd, struct net *net)
remove_cache_proc_entries(cd, net);
sunrpc_destroy_cache_detail(cd);
}
+EXPORT_SYMBOL_GPL(cache_unregister_net);
void cache_unregister(struct cache_detail *cd)
{
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 9d01d46b05f3..e4aabc02368b 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -167,6 +167,7 @@ svc_pool_map_alloc_arrays(struct svc_pool_map *m, unsigned int maxpools)
fail_free:
kfree(m->to_pool);
+ m->to_pool = NULL;
fail:
return -ENOMEM;
}
@@ -285,9 +286,10 @@ svc_pool_map_put(void)
mutex_lock(&svc_pool_map_mutex);
if (!--m->count) {
- m->mode = SVC_POOL_DEFAULT;
kfree(m->to_pool);
+ m->to_pool = NULL;
kfree(m->pool_to);
+ m->pool_to = NULL;
m->npools = 0;
}
@@ -527,17 +529,20 @@ svc_destroy(struct svc_serv *serv)
printk("svc_destroy: no threads for serv=%p!\n", serv);
del_timer_sync(&serv->sv_temptimer);
-
- svc_close_all(&serv->sv_tempsocks);
+ /*
+ * The set of xprts (contained in the sv_tempsocks and
+ * sv_permsocks lists) is now constant, since it is modified
+ * only by accepting new sockets (done by service threads in
+ * svc_recv) or aging old ones (done by sv_temptimer), or
+ * configuration changes (excluded by whatever locking the
+ * caller is using--nfsd_mutex in the case of nfsd). So it's
+ * safe to traverse those lists and shut everything down:
+ */
+ svc_close_all(serv);
if (serv->sv_shutdown)
serv->sv_shutdown(serv);
- svc_close_all(&serv->sv_permsocks);
-
- BUG_ON(!list_empty(&serv->sv_permsocks));
- BUG_ON(!list_empty(&serv->sv_tempsocks));
-
cache_clean_deferred(serv);
if (svc_serv_is_pooled(serv))
@@ -683,8 +688,8 @@ found_pool:
* Create or destroy enough new threads to make the number
* of threads the given number. If `pool' is non-NULL, applies
* only to threads in that pool, otherwise round-robins between
- * all pools. Must be called with a svc_get() reference and
- * the BKL or another lock to protect access to svc_serv fields.
+ * all pools. Caller must ensure that mutual exclusion between this and
+ * server startup or shutdown.
*
* Destroying threads relies on the service threads filling in
* rqstp->rq_task, which only the nfs ones do. Assumes the serv
diff --git a/net/sunrpc/svc_xprt.c b/net/sunrpc/svc_xprt.c
index 38649cfa4e81..74cb0d8e9ca1 100644
--- a/net/sunrpc/svc_xprt.c
+++ b/net/sunrpc/svc_xprt.c
@@ -22,6 +22,7 @@ static struct svc_deferred_req *svc_deferred_dequeue(struct svc_xprt *xprt);
static int svc_deferred_recv(struct svc_rqst *rqstp);
static struct cache_deferred_req *svc_defer(struct cache_req *req);
static void svc_age_temp_xprts(unsigned long closure);
+static void svc_delete_xprt(struct svc_xprt *xprt);
/* apparently the "standard" is that clients close
* idle connections after 5 minutes, servers after
@@ -147,8 +148,8 @@ EXPORT_SYMBOL_GPL(svc_xprt_put);
* Called by transport drivers to initialize the transport independent
* portion of the transport instance.
*/
-void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
- struct svc_serv *serv)
+void svc_xprt_init(struct net *net, struct svc_xprt_class *xcl,
+ struct svc_xprt *xprt, struct svc_serv *serv)
{
memset(xprt, 0, sizeof(*xprt));
xprt->xpt_class = xcl;
@@ -163,7 +164,7 @@ void svc_xprt_init(struct svc_xprt_class *xcl, struct svc_xprt *xprt,
spin_lock_init(&xprt->xpt_lock);
set_bit(XPT_BUSY, &xprt->xpt_flags);
rpc_init_wait_queue(&xprt->xpt_bc_pending, "xpt_bc_pending");
- xprt->xpt_net = get_net(&init_net);
+ xprt->xpt_net = get_net(net);
}
EXPORT_SYMBOL_GPL(svc_xprt_init);
@@ -878,7 +879,7 @@ static void call_xpt_users(struct svc_xprt *xprt)
/*
* Remove a dead transport
*/
-void svc_delete_xprt(struct svc_xprt *xprt)
+static void svc_delete_xprt(struct svc_xprt *xprt)
{
struct svc_serv *serv = xprt->xpt_server;
struct svc_deferred_req *dr;
@@ -893,14 +894,7 @@ void svc_delete_xprt(struct svc_xprt *xprt)
spin_lock_bh(&serv->sv_lock);
if (!test_and_set_bit(XPT_DETACHED, &xprt->xpt_flags))
list_del_init(&xprt->xpt_list);
- /*
- * The only time we're called while xpt_ready is still on a list
- * is while the list itself is about to be destroyed (in
- * svc_destroy). BUT svc_xprt_enqueue could still be attempting
- * to add new entries to the sp_sockets list, so we can't leave
- * a freed xprt on it.
- */
- list_del_init(&xprt->xpt_ready);
+ BUG_ON(!list_empty(&xprt->xpt_ready));
if (test_bit(XPT_TEMP, &xprt->xpt_flags))
serv->sv_tmpcnt--;
spin_unlock_bh(&serv->sv_lock);
@@ -928,22 +922,48 @@ void svc_close_xprt(struct svc_xprt *xprt)
}
EXPORT_SYMBOL_GPL(svc_close_xprt);
-void svc_close_all(struct list_head *xprt_list)
+static void svc_close_list(struct list_head *xprt_list)
+{
+ struct svc_xprt *xprt;
+
+ list_for_each_entry(xprt, xprt_list, xpt_list) {
+ set_bit(XPT_CLOSE, &xprt->xpt_flags);
+ set_bit(XPT_BUSY, &xprt->xpt_flags);
+ }
+}
+
+void svc_close_all(struct svc_serv *serv)
{
+ struct svc_pool *pool;
struct svc_xprt *xprt;
struct svc_xprt *tmp;
+ int i;
+
+ svc_close_list(&serv->sv_tempsocks);
+ svc_close_list(&serv->sv_permsocks);
+ for (i = 0; i < serv->sv_nrpools; i++) {
+ pool = &serv->sv_pools[i];
+
+ spin_lock_bh(&pool->sp_lock);
+ while (!list_empty(&pool->sp_sockets)) {
+ xprt = list_first_entry(&pool->sp_sockets, struct svc_xprt, xpt_ready);
+ list_del_init(&xprt->xpt_ready);
+ }
+ spin_unlock_bh(&pool->sp_lock);
+ }
/*
- * The server is shutting down, and no more threads are running.
- * svc_xprt_enqueue() might still be running, but at worst it
- * will re-add the xprt to sp_sockets, which will soon get
- * freed. So we don't bother with any more locking, and don't
- * leave the close to the (nonexistent) server threads:
+ * At this point the sp_sockets lists will stay empty, since
+ * svc_enqueue will not add new entries without taking the
+ * sp_lock and checking XPT_BUSY.
*/
- list_for_each_entry_safe(xprt, tmp, xprt_list, xpt_list) {
- set_bit(XPT_CLOSE, &xprt->xpt_flags);
+ list_for_each_entry_safe(xprt, tmp, &serv->sv_tempsocks, xpt_list)
svc_delete_xprt(xprt);
- }
+ list_for_each_entry_safe(xprt, tmp, &serv->sv_permsocks, xpt_list)
+ svc_delete_xprt(xprt);
+
+ BUG_ON(!list_empty(&serv->sv_permsocks));
+ BUG_ON(!list_empty(&serv->sv_tempsocks));
}
/*
diff --git a/net/sunrpc/svcsock.c b/net/sunrpc/svcsock.c
index 4653286fcc9e..464570906f80 100644
--- a/net/sunrpc/svcsock.c
+++ b/net/sunrpc/svcsock.c
@@ -739,7 +739,8 @@ static void svc_udp_init(struct svc_sock *svsk, struct svc_serv *serv)
{
int err, level, optname, one = 1;
- svc_xprt_init(&svc_udp_class, &svsk->sk_xprt, serv);
+ svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_udp_class,
+ &svsk->sk_xprt, serv);
clear_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
svsk->sk_sk->sk_data_ready = svc_udp_data_ready;
svsk->sk_sk->sk_write_space = svc_write_space;
@@ -1343,7 +1344,8 @@ static void svc_tcp_init(struct svc_sock *svsk, struct svc_serv *serv)
{
struct sock *sk = svsk->sk_sk;
- svc_xprt_init(&svc_tcp_class, &svsk->sk_xprt, serv);
+ svc_xprt_init(sock_net(svsk->sk_sock->sk), &svc_tcp_class,
+ &svsk->sk_xprt, serv);
set_bit(XPT_CACHE_AUTH, &svsk->sk_xprt.xpt_flags);
if (sk->sk_state == TCP_LISTEN) {
dprintk("setting up TCP socket for listening\n");
@@ -1659,7 +1661,7 @@ static struct svc_xprt *svc_bc_create_socket(struct svc_serv *serv,
return ERR_PTR(-ENOMEM);
xprt = &svsk->sk_xprt;
- svc_xprt_init(&svc_tcp_bc_class, xprt, serv);
+ svc_xprt_init(net, &svc_tcp_bc_class, xprt, serv);
serv->sv_bc_xprt = xprt;
diff --git a/net/sunrpc/xprtrdma/svc_rdma_transport.c b/net/sunrpc/xprtrdma/svc_rdma_transport.c
index ba1296d88de0..894cb42db91d 100644
--- a/net/sunrpc/xprtrdma/svc_rdma_transport.c
+++ b/net/sunrpc/xprtrdma/svc_rdma_transport.c
@@ -453,7 +453,7 @@ static struct svcxprt_rdma *rdma_create_xprt(struct svc_serv *serv,
if (!cma_xprt)
return NULL;
- svc_xprt_init(&svc_rdma_class, &cma_xprt->sc_xprt, serv);
+ svc_xprt_init(&init_net, &svc_rdma_class, &cma_xprt->sc_xprt, serv);
INIT_LIST_HEAD(&cma_xprt->sc_accept_q);
INIT_LIST_HEAD(&cma_xprt->sc_dto_q);
INIT_LIST_HEAD(&cma_xprt->sc_rq_dto_q);