From cbc20059259edee4ea24c923e6627c394830c972 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 14 Feb 2008 11:11:30 -0500 Subject: SUNRPC: Declare as const the rpc_message arguments to rpc_call_sync/async Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 8c6a7f1a25e..a23512bb240 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -548,7 +548,7 @@ EXPORT_SYMBOL_GPL(rpc_run_task); * @msg: RPC call parameters * @flags: RPC call flags */ -int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags) +int rpc_call_sync(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags) { struct rpc_task *task; struct rpc_task_setup task_setup_data = { @@ -579,7 +579,7 @@ EXPORT_SYMBOL_GPL(rpc_call_sync); * @data: user call data */ int -rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags, +rpc_call_async(struct rpc_clnt *clnt, const struct rpc_message *msg, int flags, const struct rpc_call_ops *tk_ops, void *data) { struct rpc_task *task; -- cgit v1.2.3 From 32bfb5c0f495dd88ef6bac4b76885d0820563739 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 19 Feb 2008 20:04:21 -0500 Subject: SUNRPC: Allow the rpc_release() callback to be run on another workqueue A lot of the work done by the rpc_release() callback is inappropriate for rpciod as it will often involve things like starting a new rpc call in order to clean up state after an interrupted NFSv4 open() call, or calls to mntput(), etc. This patch allows the caller of rpc_run_task() to specify that the rpc_release callback should run on a different workqueue than the default rpciod_workqueue. Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 4c669121e60..3e0b22382a3 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -326,7 +326,7 @@ static void rpc_make_runnable(struct rpc_task *task) int status; INIT_WORK(&task->u.tk_work, rpc_async_schedule); - status = queue_work(task->tk_workqueue, &task->u.tk_work); + status = queue_work(rpciod_workqueue, &task->u.tk_work); if (status < 0) { printk(KERN_WARNING "RPC: failed to add task to queue: error: %d!\n", status); task->tk_status = status; @@ -832,7 +832,7 @@ static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *ta task->tk_owner = current->tgid; /* Initialize workqueue for async tasks */ - task->tk_workqueue = rpciod_workqueue; + task->tk_workqueue = task_setup_data->workqueue; task->tk_client = task_setup_data->rpc_client; if (task->tk_client != NULL) { @@ -868,7 +868,7 @@ rpc_alloc_task(void) return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); } -static void rpc_free_task(struct rcu_head *rcu) +static void rpc_free_task_rcu(struct rcu_head *rcu) { struct rpc_task *task = container_of(rcu, struct rpc_task, u.tk_rcu); dprintk("RPC: %5u freeing task\n", task->tk_pid); @@ -898,12 +898,23 @@ out: return task; } - -void rpc_put_task(struct rpc_task *task) +static void rpc_free_task(struct rpc_task *task) { const struct rpc_call_ops *tk_ops = task->tk_ops; void *calldata = task->tk_calldata; + if (task->tk_flags & RPC_TASK_DYNAMIC) + call_rcu_bh(&task->u.tk_rcu, rpc_free_task_rcu); + rpc_release_calldata(tk_ops, calldata); +} + +static void rpc_async_release(struct work_struct *work) +{ + rpc_free_task(container_of(work, struct rpc_task, u.tk_work)); +} + +void rpc_put_task(struct rpc_task *task) +{ if (!atomic_dec_and_test(&task->tk_count)) return; /* Release resources */ @@ -915,9 +926,11 @@ void rpc_put_task(struct rpc_task *task) rpc_release_client(task->tk_client); task->tk_client = NULL; } - if (task->tk_flags & RPC_TASK_DYNAMIC) - call_rcu_bh(&task->u.tk_rcu, rpc_free_task); - rpc_release_calldata(tk_ops, calldata); + if (task->tk_workqueue != NULL) { + INIT_WORK(&task->u.tk_work, rpc_async_release); + queue_work(task->tk_workqueue, &task->u.tk_work); + } else + rpc_free_task(task); } EXPORT_SYMBOL_GPL(rpc_put_task); -- cgit v1.2.3 From fde95c7554aa77f9a242f32b0b5f8f15395abf52 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 15:09:26 -0500 Subject: SUNRPC: Clean up rpc_run_timer() All RPC timeout callback functions are expected to wake the task up. We can enforce this by moving the wakeup back into rpc_run_timer. Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 67 ++++++++++++++++++++++++++++-------------------------- net/sunrpc/xprt.c | 2 -- 2 files changed, 35 insertions(+), 34 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 3e0b22382a3..9433a113862 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -38,7 +38,6 @@ static struct kmem_cache *rpc_buffer_slabp __read_mostly; static mempool_t *rpc_task_mempool __read_mostly; static mempool_t *rpc_buffer_mempool __read_mostly; -static void __rpc_default_timer(struct rpc_task *task); static void rpc_async_schedule(struct work_struct *); static void rpc_release_task(struct rpc_task *task); @@ -66,25 +65,13 @@ __rpc_disable_timer(struct rpc_task *task) } /* - * Run a timeout function. - * We use the callback in order to allow __rpc_wake_up_task() - * and friends to disable the timer synchronously on SMP systems - * without calling del_timer_sync(). The latter could cause a - * deadlock if called while we're holding spinlocks... + * Default timeout handler if none specified by user */ -static void rpc_run_timer(struct rpc_task *task) +static void +__rpc_default_timer(struct rpc_task *task) { - void (*callback)(struct rpc_task *); - - callback = task->tk_timeout_fn; - task->tk_timeout_fn = NULL; - if (callback && RPC_IS_QUEUED(task)) { - dprintk("RPC: %5u running timer\n", task->tk_pid); - callback(task); - } - smp_mb__before_clear_bit(); - clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); - smp_mb__after_clear_bit(); + dprintk("RPC: %5u timeout (default timer)\n", task->tk_pid); + task->tk_status = -ETIMEDOUT; } /* @@ -415,17 +402,6 @@ static void __rpc_wake_up_task(struct rpc_task *task) } } -/* - * Default timeout handler if none specified by user - */ -static void -__rpc_default_timer(struct rpc_task *task) -{ - dprintk("RPC: %5u timeout (default timer)\n", task->tk_pid); - task->tk_status = -ETIMEDOUT; - rpc_wake_up_task(task); -} - /* * Wake up the specified task */ @@ -578,9 +554,37 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) } EXPORT_SYMBOL_GPL(rpc_wake_up_status); +/* + * Run a timeout function. + */ +static void rpc_run_timer(unsigned long ptr) +{ + struct rpc_task *task = (struct rpc_task *)ptr; + void (*callback)(struct rpc_task *); + + if (!rpc_start_wakeup(task)) + goto out; + if (RPC_IS_QUEUED(task)) { + struct rpc_wait_queue *queue = task->u.tk_wait.rpc_waitq; + callback = task->tk_timeout_fn; + + dprintk("RPC: %5u running timer\n", task->tk_pid); + if (callback != NULL) + callback(task); + /* Note: we're already in a bh-safe context */ + spin_lock(&queue->lock); + __rpc_do_wake_up_task(task); + spin_unlock(&queue->lock); + } + rpc_finish_wakeup(task); +out: + smp_mb__before_clear_bit(); + clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); + smp_mb__after_clear_bit(); +} + static void __rpc_atrun(struct rpc_task *task) { - rpc_wake_up_task(task); } /* @@ -816,8 +820,7 @@ EXPORT_SYMBOL_GPL(rpc_free); static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *task_setup_data) { memset(task, 0, sizeof(*task)); - setup_timer(&task->tk_timer, (void (*)(unsigned long))rpc_run_timer, - (unsigned long)task); + setup_timer(&task->tk_timer, rpc_run_timer, (unsigned long)task); atomic_set(&task->tk_count, 1); task->tk_flags = task_setup_data->flags; task->tk_ops = task_setup_data->callback_ops; diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index d5553b8179f..96c212ddc41 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -777,8 +777,6 @@ static void xprt_timer(struct rpc_task *task) xprt->ops->timer(task); task->tk_status = -ETIMEDOUT; } - task->tk_timeout = 0; - rpc_wake_up_task(task); spin_unlock(&xprt->transport_lock); } -- cgit v1.2.3 From 96ef13b283934fbf60b732e6c4ce23e8babd0042 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 15:46:41 -0500 Subject: SUNRPC: Add a new helper rpc_wake_up_queued_task() In all cases where we currently use rpc_wake_up_task(), we almost always know on which waitqueue the rpc_task is actually sleeping. This will allows us to simplify the queue locking in a future patch. Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 2 +- net/sunrpc/sched.c | 64 +++++++++++++++++++++++++----------------------------- 2 files changed, 31 insertions(+), 35 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 8c6a7f1a25e..fe95bd0ab1e 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1535,7 +1535,7 @@ void rpc_show_tasks(void) proc = -1; if (RPC_IS_QUEUED(t)) - rpc_waitq = rpc_qname(t->u.tk_wait.rpc_waitq); + rpc_waitq = rpc_qname(t->tk_waitqueue); printk("%5u %04d %04x %6d %8p %6d %8p %8ld %8s %8p %8p\n", t->tk_pid, proc, diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 9433a113862..9233ace076a 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -148,7 +148,7 @@ static void __rpc_add_wait_queue(struct rpc_wait_queue *queue, struct rpc_task * list_add(&task->u.tk_wait.list, &queue->tasks[0]); else list_add_tail(&task->u.tk_wait.list, &queue->tasks[0]); - task->u.tk_wait.rpc_waitq = queue; + task->tk_waitqueue = queue; queue->qlen++; rpc_set_queued(task); @@ -175,11 +175,8 @@ static void __rpc_remove_wait_queue_priority(struct rpc_task *task) * Remove request from queue. * Note: must be called with spin lock held. */ -static void __rpc_remove_wait_queue(struct rpc_task *task) +static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) { - struct rpc_wait_queue *queue; - queue = task->u.tk_wait.rpc_waitq; - if (RPC_IS_PRIORITY(queue)) __rpc_remove_wait_queue_priority(task); else @@ -364,11 +361,12 @@ EXPORT_SYMBOL_GPL(rpc_sleep_on); /** * __rpc_do_wake_up_task - wake up a single rpc_task + * @queue: wait queue * @task: task to be woken up * * Caller must hold queue->lock, and have cleared the task queued flag. */ -static void __rpc_do_wake_up_task(struct rpc_task *task) +static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task *task) { dprintk("RPC: %5u __rpc_wake_up_task (now %lu)\n", task->tk_pid, jiffies); @@ -383,7 +381,7 @@ static void __rpc_do_wake_up_task(struct rpc_task *task) } __rpc_disable_timer(task); - __rpc_remove_wait_queue(task); + __rpc_remove_wait_queue(queue, task); rpc_make_runnable(task); @@ -391,36 +389,38 @@ static void __rpc_do_wake_up_task(struct rpc_task *task) } /* - * Wake up the specified task + * Wake up a queued task while the queue lock is being held */ -static void __rpc_wake_up_task(struct rpc_task *task) +static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task) { + if (!RPC_IS_QUEUED(task) || task->tk_waitqueue != queue) + return; if (rpc_start_wakeup(task)) { - if (RPC_IS_QUEUED(task)) - __rpc_do_wake_up_task(task); + __rpc_do_wake_up_task(queue, task); rpc_finish_wakeup(task); } } /* - * Wake up the specified task + * Wake up a task on a specific queue */ -void rpc_wake_up_task(struct rpc_task *task) +void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) { rcu_read_lock_bh(); - if (rpc_start_wakeup(task)) { - if (RPC_IS_QUEUED(task)) { - struct rpc_wait_queue *queue = task->u.tk_wait.rpc_waitq; - - /* Note: we're already in a bh-safe context */ - spin_lock(&queue->lock); - __rpc_do_wake_up_task(task); - spin_unlock(&queue->lock); - } - rpc_finish_wakeup(task); - } + spin_lock(&queue->lock); + rpc_wake_up_task_queue_locked(queue, task); + spin_unlock(&queue->lock); rcu_read_unlock_bh(); } +EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); + +/* + * Wake up the specified task + */ +void rpc_wake_up_task(struct rpc_task *task) +{ + rpc_wake_up_queued_task(task->tk_waitqueue, task); +} EXPORT_SYMBOL_GPL(rpc_wake_up_task); /* @@ -471,7 +471,7 @@ new_queue: new_owner: rpc_set_waitqueue_owner(queue, task->tk_owner); out: - __rpc_wake_up_task(task); + rpc_wake_up_task_queue_locked(queue, task); return task; } @@ -490,7 +490,7 @@ struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) task = __rpc_wake_up_next_priority(queue); else { task_for_first(task, &queue->tasks[0]) - __rpc_wake_up_task(task); + rpc_wake_up_task_queue_locked(queue, task); } spin_unlock(&queue->lock); rcu_read_unlock_bh(); @@ -515,7 +515,7 @@ void rpc_wake_up(struct rpc_wait_queue *queue) head = &queue->tasks[queue->maxpriority]; for (;;) { list_for_each_entry_safe(task, next, head, u.tk_wait.list) - __rpc_wake_up_task(task); + rpc_wake_up_task_queue_locked(queue, task); if (head == &queue->tasks[0]) break; head--; @@ -543,7 +543,7 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) for (;;) { list_for_each_entry_safe(task, next, head, u.tk_wait.list) { task->tk_status = status; - __rpc_wake_up_task(task); + rpc_wake_up_task_queue_locked(queue, task); } if (head == &queue->tasks[0]) break; @@ -562,10 +562,8 @@ static void rpc_run_timer(unsigned long ptr) struct rpc_task *task = (struct rpc_task *)ptr; void (*callback)(struct rpc_task *); - if (!rpc_start_wakeup(task)) - goto out; if (RPC_IS_QUEUED(task)) { - struct rpc_wait_queue *queue = task->u.tk_wait.rpc_waitq; + struct rpc_wait_queue *queue = task->tk_waitqueue; callback = task->tk_timeout_fn; dprintk("RPC: %5u running timer\n", task->tk_pid); @@ -573,11 +571,9 @@ static void rpc_run_timer(unsigned long ptr) callback(task); /* Note: we're already in a bh-safe context */ spin_lock(&queue->lock); - __rpc_do_wake_up_task(task); + rpc_wake_up_task_queue_locked(queue, task); spin_unlock(&queue->lock); } - rpc_finish_wakeup(task); -out: smp_mb__before_clear_bit(); clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); smp_mb__after_clear_bit(); -- cgit v1.2.3 From fda1393938035559b417dd5b26b9cc293a7aee00 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 16:34:12 -0500 Subject: SUNRPC: Convert users of rpc_wake_up_task to use rpc_wake_up_queued_task Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 2 +- net/sunrpc/sched.c | 3 +-- net/sunrpc/xprt.c | 10 +++++----- 3 files changed, 7 insertions(+), 8 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index fe95bd0ab1e..0e209af3979 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1066,7 +1066,7 @@ call_transmit(struct rpc_task *task) if (task->tk_msg.rpc_proc->p_decode != NULL) return; task->tk_action = rpc_exit_task; - rpc_wake_up_task(task); + rpc_wake_up_queued_task(&task->tk_xprt->pending, task); } /* diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 9233ace076a..35acdc39bfc 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -417,11 +417,10 @@ EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); /* * Wake up the specified task */ -void rpc_wake_up_task(struct rpc_task *task) +static void rpc_wake_up_task(struct rpc_task *task) { rpc_wake_up_queued_task(task->tk_waitqueue, task); } -EXPORT_SYMBOL_GPL(rpc_wake_up_task); /* * Wake up the next task on a priority queue. diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 96c212ddc41..6e2772217e5 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -472,7 +472,7 @@ void xprt_write_space(struct rpc_xprt *xprt) if (xprt->snd_task) { dprintk("RPC: write space: waking waiting task on " "xprt %p\n", xprt); - rpc_wake_up_task(xprt->snd_task); + rpc_wake_up_queued_task(&xprt->pending, xprt->snd_task); } spin_unlock_bh(&xprt->transport_lock); } @@ -602,8 +602,7 @@ void xprt_force_disconnect(struct rpc_xprt *xprt) /* Try to schedule an autoclose RPC call */ if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) queue_work(rpciod_workqueue, &xprt->task_cleanup); - else if (xprt->snd_task != NULL) - rpc_wake_up_task(xprt->snd_task); + xprt_wake_pending_tasks(xprt, -ENOTCONN); spin_unlock_bh(&xprt->transport_lock); } EXPORT_SYMBOL_GPL(xprt_force_disconnect); @@ -749,18 +748,19 @@ EXPORT_SYMBOL_GPL(xprt_update_rtt); void xprt_complete_rqst(struct rpc_task *task, int copied) { struct rpc_rqst *req = task->tk_rqstp; + struct rpc_xprt *xprt = req->rq_xprt; dprintk("RPC: %5u xid %08x complete (%d bytes received)\n", task->tk_pid, ntohl(req->rq_xid), copied); - task->tk_xprt->stat.recvs++; + xprt->stat.recvs++; task->tk_rtt = (long)jiffies - req->rq_xtime; list_del_init(&req->rq_list); /* Ensure all writes are done before we update req->rq_received */ smp_wmb(); req->rq_received = req->rq_private_buf.len = copied; - rpc_wake_up_task(task); + rpc_wake_up_queued_task(&xprt->pending, task); } EXPORT_SYMBOL_GPL(xprt_complete_rqst); -- cgit v1.2.3 From 5d00837b90340af9106dcd93af75fd664c8eb87f Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 16:34:17 -0500 Subject: SUNRPC: Run rpc timeout functions as callbacks instead of in softirqs An audit of the current RPC timeout functions shows that they don't really ever need to run in the softirq context. As long as the softirq is able to signal that the wakeup is due to a timeout (which it can do by setting task->tk_status to -ETIMEDOUT) then the callback functions can just run as standard task->tk_callback functions (in the rpciod/process context). The only possible border-line case would be xprt_timer() for the case of UDP, when the callback is used to reduce the size of the transport congestion window. In testing, however, the effect of moving that update to a callback would appear to be minor. Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/auth_gss.c | 4 ++-- net/sunrpc/rpcb_clnt.c | 2 +- net/sunrpc/sched.c | 50 +++++++++++++----------------------------- net/sunrpc/xprt.c | 28 ++++++++++++----------- 4 files changed, 33 insertions(+), 51 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 6dac3879228..dc6391bcda1 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -408,13 +408,13 @@ gss_refresh_upcall(struct rpc_task *task) } spin_lock(&inode->i_lock); if (gss_cred->gc_upcall != NULL) - rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL, NULL); + rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { task->tk_timeout = 0; gss_cred->gc_upcall = gss_msg; /* gss_upcall_callback will release the reference to gss_upcall_msg */ atomic_inc(&gss_msg->count); - rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback, NULL); + rpc_sleep_on(&gss_msg->rpc_waitqueue, task, gss_upcall_callback); } else err = gss_msg->msg.errno; spin_unlock(&inode->i_lock); diff --git a/net/sunrpc/rpcb_clnt.c b/net/sunrpc/rpcb_clnt.c index 3164a0871cf..f480c718b40 100644 --- a/net/sunrpc/rpcb_clnt.c +++ b/net/sunrpc/rpcb_clnt.c @@ -298,7 +298,7 @@ void rpcb_getport_async(struct rpc_task *task) /* Put self on queue before sending rpcbind request, in case * rpcb_getport_done completes before we return from rpc_run_task */ - rpc_sleep_on(&xprt->binding, task, NULL, NULL); + rpc_sleep_on(&xprt->binding, task, NULL); /* Someone else may have bound if we slept */ if (xprt_bound(xprt)) { diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 35acdc39bfc..caf12fd6b6a 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -56,29 +56,18 @@ struct workqueue_struct *rpciod_workqueue; * queue->lock and bh_disabled in order to avoid races within * rpc_run_timer(). */ -static inline void +static void __rpc_disable_timer(struct rpc_task *task) { dprintk("RPC: %5u disabling timer\n", task->tk_pid); - task->tk_timeout_fn = NULL; task->tk_timeout = 0; } -/* - * Default timeout handler if none specified by user - */ -static void -__rpc_default_timer(struct rpc_task *task) -{ - dprintk("RPC: %5u timeout (default timer)\n", task->tk_pid); - task->tk_status = -ETIMEDOUT; -} - /* * Set up a timer for the current task. */ -static inline void -__rpc_add_timer(struct rpc_task *task, rpc_action timer) +static void +__rpc_add_timer(struct rpc_task *task) { if (!task->tk_timeout) return; @@ -86,10 +75,6 @@ __rpc_add_timer(struct rpc_task *task, rpc_action timer) dprintk("RPC: %5u setting alarm for %lu ms\n", task->tk_pid, task->tk_timeout * 1000 / HZ); - if (timer) - task->tk_timeout_fn = timer; - else - task->tk_timeout_fn = __rpc_default_timer; set_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); mod_timer(&task->tk_timer, jiffies + task->tk_timeout); } @@ -297,7 +282,6 @@ EXPORT_SYMBOL_GPL(__rpc_wait_for_completion_task); */ static void rpc_make_runnable(struct rpc_task *task) { - BUG_ON(task->tk_timeout_fn); rpc_clear_queued(task); if (rpc_test_and_set_running(task)) return; @@ -327,7 +311,7 @@ static void rpc_make_runnable(struct rpc_task *task) * as it's on a wait queue. */ static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, - rpc_action action, rpc_action timer) + rpc_action action) { dprintk("RPC: %5u sleep_on(queue \"%s\" time %lu)\n", task->tk_pid, rpc_qname(q), jiffies); @@ -341,11 +325,11 @@ static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, BUG_ON(task->tk_callback != NULL); task->tk_callback = action; - __rpc_add_timer(task, timer); + __rpc_add_timer(task); } void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, - rpc_action action, rpc_action timer) + rpc_action action) { /* Mark the task as being activated if so needed */ rpc_set_active(task); @@ -354,7 +338,7 @@ void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, * Protect the queue operations. */ spin_lock_bh(&q->lock); - __rpc_sleep_on(q, task, action, timer); + __rpc_sleep_on(q, task, action); spin_unlock_bh(&q->lock); } EXPORT_SYMBOL_GPL(rpc_sleep_on); @@ -559,20 +543,15 @@ EXPORT_SYMBOL_GPL(rpc_wake_up_status); static void rpc_run_timer(unsigned long ptr) { struct rpc_task *task = (struct rpc_task *)ptr; - void (*callback)(struct rpc_task *); + struct rpc_wait_queue *queue = task->tk_waitqueue; - if (RPC_IS_QUEUED(task)) { - struct rpc_wait_queue *queue = task->tk_waitqueue; - callback = task->tk_timeout_fn; - - dprintk("RPC: %5u running timer\n", task->tk_pid); - if (callback != NULL) - callback(task); - /* Note: we're already in a bh-safe context */ - spin_lock(&queue->lock); + spin_lock(&queue->lock); + if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) { + dprintk("RPC: %5u timeout\n", task->tk_pid); + task->tk_status = -ETIMEDOUT; rpc_wake_up_task_queue_locked(queue, task); - spin_unlock(&queue->lock); } + spin_unlock(&queue->lock); smp_mb__before_clear_bit(); clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); smp_mb__after_clear_bit(); @@ -580,6 +559,7 @@ static void rpc_run_timer(unsigned long ptr) static void __rpc_atrun(struct rpc_task *task) { + task->tk_status = 0; } /* @@ -588,7 +568,7 @@ static void __rpc_atrun(struct rpc_task *task) void rpc_delay(struct rpc_task *task, unsigned long delay) { task->tk_timeout = delay; - rpc_sleep_on(&delay_queue, task, NULL, __rpc_atrun); + rpc_sleep_on(&delay_queue, task, __rpc_atrun); } EXPORT_SYMBOL_GPL(rpc_delay); diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 6e2772217e5..9bf118c5431 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -188,9 +188,9 @@ out_sleep: task->tk_timeout = 0; task->tk_status = -EAGAIN; if (req && req->rq_ntrans) - rpc_sleep_on(&xprt->resend, task, NULL, NULL); + rpc_sleep_on(&xprt->resend, task, NULL); else - rpc_sleep_on(&xprt->sending, task, NULL, NULL); + rpc_sleep_on(&xprt->sending, task, NULL); return 0; } EXPORT_SYMBOL_GPL(xprt_reserve_xprt); @@ -238,9 +238,9 @@ out_sleep: task->tk_timeout = 0; task->tk_status = -EAGAIN; if (req && req->rq_ntrans) - rpc_sleep_on(&xprt->resend, task, NULL, NULL); + rpc_sleep_on(&xprt->resend, task, NULL); else - rpc_sleep_on(&xprt->sending, task, NULL, NULL); + rpc_sleep_on(&xprt->sending, task, NULL); return 0; } EXPORT_SYMBOL_GPL(xprt_reserve_xprt_cong); @@ -453,7 +453,7 @@ void xprt_wait_for_buffer_space(struct rpc_task *task) struct rpc_xprt *xprt = req->rq_xprt; task->tk_timeout = req->rq_timeout; - rpc_sleep_on(&xprt->pending, task, NULL, NULL); + rpc_sleep_on(&xprt->pending, task, NULL); } EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); @@ -652,7 +652,7 @@ void xprt_connect(struct rpc_task *task) task->tk_rqstp->rq_bytes_sent = 0; task->tk_timeout = xprt->connect_timeout; - rpc_sleep_on(&xprt->pending, task, xprt_connect_status, NULL); + rpc_sleep_on(&xprt->pending, task, xprt_connect_status); xprt->stat.connect_start = jiffies; xprt->ops->connect(task); } @@ -769,15 +769,17 @@ static void xprt_timer(struct rpc_task *task) struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; + if (task->tk_status != -ETIMEDOUT) + return; dprintk("RPC: %5u xprt_timer\n", task->tk_pid); - spin_lock(&xprt->transport_lock); + spin_lock_bh(&xprt->transport_lock); if (!req->rq_received) { if (xprt->ops->timer) xprt->ops->timer(task); - task->tk_status = -ETIMEDOUT; - } - spin_unlock(&xprt->transport_lock); + } else + task->tk_status = 0; + spin_unlock_bh(&xprt->transport_lock); } /** @@ -862,7 +864,7 @@ void xprt_transmit(struct rpc_task *task) if (!xprt_connected(xprt)) task->tk_status = -ENOTCONN; else if (!req->rq_received) - rpc_sleep_on(&xprt->pending, task, NULL, xprt_timer); + rpc_sleep_on(&xprt->pending, task, xprt_timer); spin_unlock_bh(&xprt->transport_lock); return; } @@ -873,7 +875,7 @@ void xprt_transmit(struct rpc_task *task) */ task->tk_status = status; if (status == -ECONNREFUSED) - rpc_sleep_on(&xprt->sending, task, NULL, NULL); + rpc_sleep_on(&xprt->sending, task, NULL); } static inline void do_xprt_reserve(struct rpc_task *task) @@ -893,7 +895,7 @@ static inline void do_xprt_reserve(struct rpc_task *task) dprintk("RPC: waiting for request slot\n"); task->tk_status = -EAGAIN; task->tk_timeout = 0; - rpc_sleep_on(&xprt->backlog, task, NULL, NULL); + rpc_sleep_on(&xprt->backlog, task, NULL); } /** -- cgit v1.2.3 From f6a1cc89309f0ae847a9b6fe418d1c4215e5bc55 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 17:06:55 -0500 Subject: SUNRPC: Add a (empty for the moment) destructor for rpc_wait_queues Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/auth_gss.c | 1 + net/sunrpc/sched.c | 21 ++++++++++++++------- net/sunrpc/xprt.c | 5 +++++ 3 files changed, 20 insertions(+), 7 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index dc6391bcda1..ef638496180 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -266,6 +266,7 @@ gss_release_msg(struct gss_upcall_msg *gss_msg) BUG_ON(!list_empty(&gss_msg->list)); if (gss_msg->ctx != NULL) gss_put_ctx(gss_msg->ctx); + rpc_destroy_wait_queue(&gss_msg->rpc_waitqueue); kfree(gss_msg); } diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index caf12fd6b6a..86aa897e7b0 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -214,6 +214,11 @@ void rpc_init_wait_queue(struct rpc_wait_queue *queue, const char *qname) } EXPORT_SYMBOL_GPL(rpc_init_wait_queue); +void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) +{ +} +EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); + static int rpc_wait_bit_killable(void *word) { if (fatal_signal_pending(current)) @@ -1020,11 +1025,20 @@ rpc_destroy_mempool(void) kmem_cache_destroy(rpc_task_slabp); if (rpc_buffer_slabp) kmem_cache_destroy(rpc_buffer_slabp); + rpc_destroy_wait_queue(&delay_queue); } int rpc_init_mempool(void) { + /* + * The following is not strictly a mempool initialisation, + * but there is no harm in doing it here + */ + rpc_init_wait_queue(&delay_queue, "delayq"); + if (!rpciod_start()) + goto err_nomem; + rpc_task_slabp = kmem_cache_create("rpc_tasks", sizeof(struct rpc_task), 0, SLAB_HWCACHE_ALIGN, @@ -1045,13 +1059,6 @@ rpc_init_mempool(void) rpc_buffer_slabp); if (!rpc_buffer_mempool) goto err_nomem; - if (!rpciod_start()) - goto err_nomem; - /* - * The following is not strictly a mempool initialisation, - * but there is no harm in doing it here - */ - rpc_init_wait_queue(&delay_queue, "delayq"); return 0; err_nomem: rpc_destroy_mempool(); diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 9bf118c5431..85199c64702 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -1052,6 +1052,11 @@ static void xprt_destroy(struct kref *kref) xprt->shutdown = 1; del_timer_sync(&xprt->timer); + rpc_destroy_wait_queue(&xprt->binding); + rpc_destroy_wait_queue(&xprt->pending); + rpc_destroy_wait_queue(&xprt->sending); + rpc_destroy_wait_queue(&xprt->resend); + rpc_destroy_wait_queue(&xprt->backlog); /* * Tear down transport state and free the rpc_xprt */ -- cgit v1.2.3 From 36df9aae3158ce8fc4ede241169dc94ac910d884 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 18 Jul 2007 16:18:52 -0400 Subject: SUNRPC: Add a timer function to wait queues. This is designed to replace the timeout timer in the individual rpc_tasks. By putting the timer function in the wait queue, we will eventually be able to reduce the total number of timers in use by the RPC subsystem. Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 46 ++++++++++++++++++++++++++++++++++++++++++---- 1 file changed, 42 insertions(+), 4 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 86aa897e7b0..29b1c1441f4 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -40,6 +40,7 @@ static mempool_t *rpc_buffer_mempool __read_mostly; static void rpc_async_schedule(struct work_struct *); static void rpc_release_task(struct rpc_task *task); +static void __rpc_queue_timer_fn(unsigned long ptr); /* * RPC tasks sit here while waiting for conditions to improve. @@ -59,8 +60,18 @@ struct workqueue_struct *rpciod_workqueue; static void __rpc_disable_timer(struct rpc_task *task) { + if (task->tk_timeout == 0) + return; dprintk("RPC: %5u disabling timer\n", task->tk_pid); task->tk_timeout = 0; + list_del(&task->u.tk_wait.timer_list); +} + +static void +rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) +{ + queue->timer_list.expires = expires; + mod_timer(&queue->timer_list.timer, expires); } /* @@ -153,7 +164,6 @@ static void __rpc_remove_wait_queue_priority(struct rpc_task *task) list_move(&t->u.tk_wait.list, &task->u.tk_wait.list); list_splice_init(&task->u.tk_wait.links, &t->u.tk_wait.links); } - list_del(&task->u.tk_wait.list); } /* @@ -162,10 +172,10 @@ static void __rpc_remove_wait_queue_priority(struct rpc_task *task) */ static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) { + __rpc_disable_timer(task); if (RPC_IS_PRIORITY(queue)) __rpc_remove_wait_queue_priority(task); - else - list_del(&task->u.tk_wait.list); + list_del(&task->u.tk_wait.list); queue->qlen--; dprintk("RPC: %5u removed from queue %p \"%s\"\n", task->tk_pid, queue, rpc_qname(queue)); @@ -198,6 +208,9 @@ static void __rpc_init_priority_wait_queue(struct rpc_wait_queue *queue, const c INIT_LIST_HEAD(&queue->tasks[i]); queue->maxpriority = nr_queues - 1; rpc_reset_waitqueue_priority(queue); + queue->qlen = 0; + setup_timer(&queue->timer_list.timer, __rpc_queue_timer_fn, (unsigned long)queue); + INIT_LIST_HEAD(&queue->timer_list.list); #ifdef RPC_DEBUG queue->name = qname; #endif @@ -216,6 +229,7 @@ EXPORT_SYMBOL_GPL(rpc_init_wait_queue); void rpc_destroy_wait_queue(struct rpc_wait_queue *queue) { + del_timer_sync(&queue->timer_list.timer); } EXPORT_SYMBOL_GPL(rpc_destroy_wait_queue); @@ -369,7 +383,6 @@ static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task return; } - __rpc_disable_timer(task); __rpc_remove_wait_queue(queue, task); rpc_make_runnable(task); @@ -562,6 +575,31 @@ static void rpc_run_timer(unsigned long ptr) smp_mb__after_clear_bit(); } +static void __rpc_queue_timer_fn(unsigned long ptr) +{ + struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; + struct rpc_task *task, *n; + unsigned long expires, now, timeo; + + spin_lock(&queue->lock); + expires = now = jiffies; + list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { + timeo = task->u.tk_wait.expires; + if (time_after_eq(now, timeo)) { + list_del_init(&task->u.tk_wait.timer_list); + dprintk("RPC: %5u timeout\n", task->tk_pid); + task->tk_status = -ETIMEDOUT; + rpc_wake_up_task_queue_locked(queue, task); + continue; + } + if (expires == now || time_after(expires, timeo)) + expires = timeo; + } + if (!list_empty(&queue->timer_list.list)) + rpc_set_queue_timer(queue, expires); + spin_unlock(&queue->lock); +} + static void __rpc_atrun(struct rpc_task *task) { task->tk_status = 0; -- cgit v1.2.3 From eb276c0e10187702928aeaa133e1d3dbaf3eafc7 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 22 Feb 2008 17:27:59 -0500 Subject: SUNRPC: Switch tasks to using the rpc_waitqueue's timer function Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 60 +++++++++--------------------------------------------- 1 file changed, 10 insertions(+), 50 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 29b1c1441f4..043eef4c15a 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -58,13 +58,15 @@ struct workqueue_struct *rpciod_workqueue; * rpc_run_timer(). */ static void -__rpc_disable_timer(struct rpc_task *task) +__rpc_disable_timer(struct rpc_wait_queue *queue, struct rpc_task *task) { if (task->tk_timeout == 0) return; dprintk("RPC: %5u disabling timer\n", task->tk_pid); task->tk_timeout = 0; list_del(&task->u.tk_wait.timer_list); + if (list_empty(&queue->timer_list.list)) + del_timer(&queue->timer_list.timer); } static void @@ -78,7 +80,7 @@ rpc_set_queue_timer(struct rpc_wait_queue *queue, unsigned long expires) * Set up a timer for the current task. */ static void -__rpc_add_timer(struct rpc_task *task) +__rpc_add_timer(struct rpc_wait_queue *queue, struct rpc_task *task) { if (!task->tk_timeout) return; @@ -86,23 +88,10 @@ __rpc_add_timer(struct rpc_task *task) dprintk("RPC: %5u setting alarm for %lu ms\n", task->tk_pid, task->tk_timeout * 1000 / HZ); - set_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); - mod_timer(&task->tk_timer, jiffies + task->tk_timeout); -} - -/* - * Delete any timer for the current task. Because we use del_timer_sync(), - * this function should never be called while holding queue->lock. - */ -static void -rpc_delete_timer(struct rpc_task *task) -{ - if (RPC_IS_QUEUED(task)) - return; - if (test_and_clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate)) { - del_singleshot_timer_sync(&task->tk_timer); - dprintk("RPC: %5u deleting timer\n", task->tk_pid); - } + task->u.tk_wait.expires = jiffies + task->tk_timeout; + if (list_empty(&queue->timer_list.list) || time_before(task->u.tk_wait.expires, queue->timer_list.expires)) + rpc_set_queue_timer(queue, task->u.tk_wait.expires); + list_add(&task->u.tk_wait.timer_list, &queue->timer_list.list); } /* @@ -172,7 +161,7 @@ static void __rpc_remove_wait_queue_priority(struct rpc_task *task) */ static void __rpc_remove_wait_queue(struct rpc_wait_queue *queue, struct rpc_task *task) { - __rpc_disable_timer(task); + __rpc_disable_timer(queue, task); if (RPC_IS_PRIORITY(queue)) __rpc_remove_wait_queue_priority(task); list_del(&task->u.tk_wait.list); @@ -344,7 +333,7 @@ static void __rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, BUG_ON(task->tk_callback != NULL); task->tk_callback = action; - __rpc_add_timer(task); + __rpc_add_timer(q, task); } void rpc_sleep_on(struct rpc_wait_queue *q, struct rpc_task *task, @@ -555,26 +544,6 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) } EXPORT_SYMBOL_GPL(rpc_wake_up_status); -/* - * Run a timeout function. - */ -static void rpc_run_timer(unsigned long ptr) -{ - struct rpc_task *task = (struct rpc_task *)ptr; - struct rpc_wait_queue *queue = task->tk_waitqueue; - - spin_lock(&queue->lock); - if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) { - dprintk("RPC: %5u timeout\n", task->tk_pid); - task->tk_status = -ETIMEDOUT; - rpc_wake_up_task_queue_locked(queue, task); - } - spin_unlock(&queue->lock); - smp_mb__before_clear_bit(); - clear_bit(RPC_TASK_HAS_TIMER, &task->tk_runstate); - smp_mb__after_clear_bit(); -} - static void __rpc_queue_timer_fn(unsigned long ptr) { struct rpc_wait_queue *queue = (struct rpc_wait_queue *)ptr; @@ -586,7 +555,6 @@ static void __rpc_queue_timer_fn(unsigned long ptr) list_for_each_entry_safe(task, n, &queue->timer_list.list, u.tk_wait.timer_list) { timeo = task->u.tk_wait.expires; if (time_after_eq(now, timeo)) { - list_del_init(&task->u.tk_wait.timer_list); dprintk("RPC: %5u timeout\n", task->tk_pid); task->tk_status = -ETIMEDOUT; rpc_wake_up_task_queue_locked(queue, task); @@ -666,10 +634,6 @@ static void __rpc_execute(struct rpc_task *task) BUG_ON(RPC_IS_QUEUED(task)); for (;;) { - /* - * Garbage collection of pending timers... - */ - rpc_delete_timer(task); /* * Execute any pending callback. @@ -838,7 +802,6 @@ EXPORT_SYMBOL_GPL(rpc_free); static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *task_setup_data) { memset(task, 0, sizeof(*task)); - setup_timer(&task->tk_timer, rpc_run_timer, (unsigned long)task); atomic_set(&task->tk_count, 1); task->tk_flags = task_setup_data->flags; task->tk_ops = task_setup_data->callback_ops; @@ -971,9 +934,6 @@ static void rpc_release_task(struct rpc_task *task) } BUG_ON (RPC_IS_QUEUED(task)); - /* Synchronously delete any running timer */ - rpc_delete_timer(task); - #ifdef RPC_DEBUG task->tk_magic = 0; #endif -- cgit v1.2.3 From f5fb7b06e4e4ab18326f067f4317b2016ce18af2 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 25 Feb 2008 21:40:50 -0800 Subject: SUNRPC: Eliminate the now-redundant rpc_start_wakeup() Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 8 ++------ 1 file changed, 2 insertions(+), 6 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 043eef4c15a..88a686a8e43 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -384,12 +384,8 @@ static void __rpc_do_wake_up_task(struct rpc_wait_queue *queue, struct rpc_task */ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct rpc_task *task) { - if (!RPC_IS_QUEUED(task) || task->tk_waitqueue != queue) - return; - if (rpc_start_wakeup(task)) { - __rpc_do_wake_up_task(queue, task); - rpc_finish_wakeup(task); - } + if (RPC_IS_QUEUED(task) && task->tk_waitqueue == queue) + __rpc_do_wake_up_task(queue, task); } /* -- cgit v1.2.3 From ff2d7db848f8db7cade39e55f78f86d77e0de01a Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 25 Feb 2008 21:40:51 -0800 Subject: SUNRPC: Ensure that we read all available tcp data Don't stop until we run out of data, or we hit an error. Signed-off-by: Trond Myklebust --- net/sunrpc/xprtsock.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 30e7ac243a9..8bd3b0f73ac 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -1073,6 +1073,7 @@ static void xs_tcp_data_ready(struct sock *sk, int bytes) { struct rpc_xprt *xprt; read_descriptor_t rd_desc; + int read; dprintk("RPC: xs_tcp_data_ready...\n"); @@ -1084,8 +1085,10 @@ static void xs_tcp_data_ready(struct sock *sk, int bytes) /* We use rd_desc to pass struct xprt to xs_tcp_data_recv */ rd_desc.arg.data = xprt; - rd_desc.count = 65536; - tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); + do { + rd_desc.count = 65536; + read = tcp_read_sock(sk, &rd_desc, xs_tcp_data_recv); + } while (read > 0); out: read_unlock(&sk->sk_callback_lock); } -- cgit v1.2.3 From 5e4424af9a1f062c6451681dff24a26e27741cc6 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 25 Feb 2008 21:53:49 -0800 Subject: SUNRPC: Remove now-redundant RCU-safe rpc_task free path Now that we've tightened up the locking rules for RPC queue wakeups, we can remove the RCU-safe kfree calls... Signed-off-by: Trond Myklebust --- net/sunrpc/sched.c | 37 ++++++++++++------------------------- 1 file changed, 12 insertions(+), 25 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 88a686a8e43..cae219c8cae 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -393,11 +393,9 @@ static void rpc_wake_up_task_queue_locked(struct rpc_wait_queue *queue, struct r */ void rpc_wake_up_queued_task(struct rpc_wait_queue *queue, struct rpc_task *task) { - rcu_read_lock_bh(); - spin_lock(&queue->lock); + spin_lock_bh(&queue->lock); rpc_wake_up_task_queue_locked(queue, task); - spin_unlock(&queue->lock); - rcu_read_unlock_bh(); + spin_unlock_bh(&queue->lock); } EXPORT_SYMBOL_GPL(rpc_wake_up_queued_task); @@ -470,16 +468,14 @@ struct rpc_task * rpc_wake_up_next(struct rpc_wait_queue *queue) dprintk("RPC: wake_up_next(%p \"%s\")\n", queue, rpc_qname(queue)); - rcu_read_lock_bh(); - spin_lock(&queue->lock); + spin_lock_bh(&queue->lock); if (RPC_IS_PRIORITY(queue)) task = __rpc_wake_up_next_priority(queue); else { task_for_first(task, &queue->tasks[0]) rpc_wake_up_task_queue_locked(queue, task); } - spin_unlock(&queue->lock); - rcu_read_unlock_bh(); + spin_unlock_bh(&queue->lock); return task; } @@ -496,8 +492,7 @@ void rpc_wake_up(struct rpc_wait_queue *queue) struct rpc_task *task, *next; struct list_head *head; - rcu_read_lock_bh(); - spin_lock(&queue->lock); + spin_lock_bh(&queue->lock); head = &queue->tasks[queue->maxpriority]; for (;;) { list_for_each_entry_safe(task, next, head, u.tk_wait.list) @@ -506,8 +501,7 @@ void rpc_wake_up(struct rpc_wait_queue *queue) break; head--; } - spin_unlock(&queue->lock); - rcu_read_unlock_bh(); + spin_unlock_bh(&queue->lock); } EXPORT_SYMBOL_GPL(rpc_wake_up); @@ -523,8 +517,7 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) struct rpc_task *task, *next; struct list_head *head; - rcu_read_lock_bh(); - spin_lock(&queue->lock); + spin_lock_bh(&queue->lock); head = &queue->tasks[queue->maxpriority]; for (;;) { list_for_each_entry_safe(task, next, head, u.tk_wait.list) { @@ -535,8 +528,7 @@ void rpc_wake_up_status(struct rpc_wait_queue *queue, int status) break; head--; } - spin_unlock(&queue->lock); - rcu_read_unlock_bh(); + spin_unlock_bh(&queue->lock); } EXPORT_SYMBOL_GPL(rpc_wake_up_status); @@ -848,13 +840,6 @@ rpc_alloc_task(void) return (struct rpc_task *)mempool_alloc(rpc_task_mempool, GFP_NOFS); } -static void rpc_free_task_rcu(struct rcu_head *rcu) -{ - struct rpc_task *task = container_of(rcu, struct rpc_task, u.tk_rcu); - dprintk("RPC: %5u freeing task\n", task->tk_pid); - mempool_free(task, rpc_task_mempool); -} - /* * Create a new task for the specified client. */ @@ -883,8 +868,10 @@ static void rpc_free_task(struct rpc_task *task) const struct rpc_call_ops *tk_ops = task->tk_ops; void *calldata = task->tk_calldata; - if (task->tk_flags & RPC_TASK_DYNAMIC) - call_rcu_bh(&task->u.tk_rcu, rpc_free_task_rcu); + if (task->tk_flags & RPC_TASK_DYNAMIC) { + dprintk("RPC: %5u freeing task\n", task->tk_pid); + mempool_free(task, rpc_task_mempool); + } rpc_release_calldata(tk_ops, calldata); } -- cgit v1.2.3 From 25337fdc85951dfeac944f16cb565904c619077a Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 14:40:14 -0400 Subject: SUNRPC: Fix a bug in rpcauth_lookup_credcache() The hash bucket is for some reason always being set to zero. Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index eca941ce298..b38f6ee2f5e 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -11,6 +11,7 @@ #include #include #include +#include #include #include @@ -280,7 +281,9 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, struct hlist_node *pos; struct rpc_cred *cred = NULL, *entry, *new; - int nr = 0; + unsigned int nr; + + nr = hash_long(acred->uid, RPC_CREDCACHE_HASHBITS); if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS)) nr = acred->uid & RPC_CREDCACHE_MASK; -- cgit v1.2.3 From af093835774931de898a9baf7b4041fa0d100f77 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 12:12:16 -0400 Subject: SUNRPC: Fix RPCAUTH_LOOKUP_ROOTCREDS The current RPCAUTH_LOOKUP_ROOTCREDS flag only works for AUTH_SYS authentication, and then only as a special case in the code. This patch removes the auth_sys special casing, and replaces it with generic code. Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 35 +++++++++++++++++-------------- net/sunrpc/auth_unix.c | 56 ++++++++++++++++++++++---------------------------- net/sunrpc/sched.c | 4 +++- 3 files changed, 47 insertions(+), 48 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index b38f6ee2f5e..b0f2b2ee7cc 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -285,9 +285,6 @@ rpcauth_lookup_credcache(struct rpc_auth *auth, struct auth_cred * acred, nr = hash_long(acred->uid, RPC_CREDCACHE_HASHBITS); - if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS)) - nr = acred->uid & RPC_CREDCACHE_MASK; - rcu_read_lock(); hlist_for_each_entry_rcu(entry, pos, &cache->hashtable[nr], cr_hash) { if (!entry->cr_ops->crmatch(acred, entry, flags)) @@ -378,30 +375,38 @@ rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, } EXPORT_SYMBOL_GPL(rpcauth_init_cred); -struct rpc_cred * -rpcauth_bindcred(struct rpc_task *task) +void +rpcauth_bind_root_cred(struct rpc_task *task) { struct rpc_auth *auth = task->tk_client->cl_auth; struct auth_cred acred = { - .uid = current->fsuid, - .gid = current->fsgid, - .group_info = current->group_info, + .uid = 0, + .gid = 0, }; struct rpc_cred *ret; - int flags = 0; dprintk("RPC: %5u looking up %s cred\n", task->tk_pid, task->tk_client->cl_auth->au_ops->au_name); - get_group_info(acred.group_info); - if (task->tk_flags & RPC_TASK_ROOTCREDS) - flags |= RPCAUTH_LOOKUP_ROOTCREDS; - ret = auth->au_ops->lookup_cred(auth, &acred, flags); + ret = auth->au_ops->lookup_cred(auth, &acred, 0); + if (!IS_ERR(ret)) + task->tk_msg.rpc_cred = ret; + else + task->tk_status = PTR_ERR(ret); +} + +void +rpcauth_bindcred(struct rpc_task *task) +{ + struct rpc_auth *auth = task->tk_client->cl_auth; + struct rpc_cred *ret; + + dprintk("RPC: %5u looking up %s cred\n", + task->tk_pid, auth->au_ops->au_name); + ret = rpcauth_lookupcred(auth, 0); if (!IS_ERR(ret)) task->tk_msg.rpc_cred = ret; else task->tk_status = PTR_ERR(ret); - put_group_info(acred.group_info); - return ret; } void diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c index 5ed91e5bcee..b763710d3db 100644 --- a/net/sunrpc/auth_unix.c +++ b/net/sunrpc/auth_unix.c @@ -60,7 +60,8 @@ static struct rpc_cred * unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) { struct unx_cred *cred; - int i; + unsigned int groups = 0; + unsigned int i; dprintk("RPC: allocating UNIX cred for uid %d gid %d\n", acred->uid, acred->gid); @@ -70,21 +71,17 @@ unx_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) rpcauth_init_cred(&cred->uc_base, acred, auth, &unix_credops); cred->uc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; - if (flags & RPCAUTH_LOOKUP_ROOTCREDS) { - cred->uc_uid = 0; - cred->uc_gid = 0; - cred->uc_gids[0] = NOGROUP; - } else { - int groups = acred->group_info->ngroups; - if (groups > NFS_NGROUPS) - groups = NFS_NGROUPS; - - cred->uc_gid = acred->gid; - for (i = 0; i < groups; i++) - cred->uc_gids[i] = GROUP_AT(acred->group_info, i); - if (i < NFS_NGROUPS) - cred->uc_gids[i] = NOGROUP; - } + + if (acred->group_info != NULL) + groups = acred->group_info->ngroups; + if (groups > NFS_NGROUPS) + groups = NFS_NGROUPS; + + cred->uc_gid = acred->gid; + for (i = 0; i < groups; i++) + cred->uc_gids[i] = GROUP_AT(acred->group_info, i); + if (i < NFS_NGROUPS) + cred->uc_gids[i] = NOGROUP; return &cred->uc_base; } @@ -118,26 +115,21 @@ static int unx_match(struct auth_cred *acred, struct rpc_cred *rcred, int flags) { struct unx_cred *cred = container_of(rcred, struct unx_cred, uc_base); - int i; + unsigned int groups = 0; + unsigned int i; - if (!(flags & RPCAUTH_LOOKUP_ROOTCREDS)) { - int groups; - if (cred->uc_uid != acred->uid - || cred->uc_gid != acred->gid) - return 0; + if (cred->uc_uid != acred->uid || cred->uc_gid != acred->gid) + return 0; + if (acred->group_info != NULL) groups = acred->group_info->ngroups; - if (groups > NFS_NGROUPS) - groups = NFS_NGROUPS; - for (i = 0; i < groups ; i++) - if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i)) - return 0; - return 1; - } - return (cred->uc_uid == 0 - && cred->uc_gid == 0 - && cred->uc_gids[0] == (gid_t) NOGROUP); + if (groups > NFS_NGROUPS) + groups = NFS_NGROUPS; + for (i = 0; i < groups ; i++) + if (cred->uc_gids[i] != GROUP_AT(acred->group_info, i)) + return 0; + return 1; } /* diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index cae219c8cae..7db956f6e01 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -821,8 +821,10 @@ static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *ta /* Bind the user cred */ if (task->tk_msg.rpc_cred != NULL) rpcauth_holdcred(task); - else + else if (!(task_setup_data->flags & RPC_TASK_ROOTCREDS)) rpcauth_bindcred(task); + else + rpcauth_bind_root_cred(task); if (task->tk_action == NULL) rpc_call_start(task); } -- cgit v1.2.3 From 4ccda2cdd8d156b6f49440653d5d6997e0facf97 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 16:20:55 -0400 Subject: SUNRPC: Clean up rpcauth_bindcred() Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 28 ++++++++++++++++++---------- net/sunrpc/sched.c | 11 ++++------- 2 files changed, 22 insertions(+), 17 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index b0f2b2ee7cc..1cdb163c4f8 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -375,7 +375,15 @@ rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, } EXPORT_SYMBOL_GPL(rpcauth_init_cred); -void +static void +rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred) +{ + task->tk_msg.rpc_cred = get_rpccred(cred); + dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, + cred->cr_auth->au_ops->au_name, cred); +} + +static void rpcauth_bind_root_cred(struct rpc_task *task) { struct rpc_auth *auth = task->tk_client->cl_auth; @@ -394,8 +402,8 @@ rpcauth_bind_root_cred(struct rpc_task *task) task->tk_status = PTR_ERR(ret); } -void -rpcauth_bindcred(struct rpc_task *task) +static void +rpcauth_bind_new_cred(struct rpc_task *task) { struct rpc_auth *auth = task->tk_client->cl_auth; struct rpc_cred *ret; @@ -410,14 +418,14 @@ rpcauth_bindcred(struct rpc_task *task) } void -rpcauth_holdcred(struct rpc_task *task) +rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags) { - struct rpc_cred *cred = task->tk_msg.rpc_cred; - if (cred != NULL) { - get_rpccred(cred); - dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, - cred->cr_auth->au_ops->au_name, cred); - } + if (cred != NULL) + rpcauth_generic_bind_cred(task, cred); + else if (flags & RPC_TASK_ROOTCREDS) + rpcauth_bind_root_cred(task); + else + rpcauth_bind_new_cred(task); } void diff --git a/net/sunrpc/sched.c b/net/sunrpc/sched.c index 7db956f6e01..6eab9bf94ba 100644 --- a/net/sunrpc/sched.c +++ b/net/sunrpc/sched.c @@ -817,14 +817,11 @@ static void rpc_init_task(struct rpc_task *task, const struct rpc_task_setup *ta task->tk_action = rpc_prepare_task; if (task_setup_data->rpc_message != NULL) { - memcpy(&task->tk_msg, task_setup_data->rpc_message, sizeof(task->tk_msg)); + task->tk_msg.rpc_proc = task_setup_data->rpc_message->rpc_proc; + task->tk_msg.rpc_argp = task_setup_data->rpc_message->rpc_argp; + task->tk_msg.rpc_resp = task_setup_data->rpc_message->rpc_resp; /* Bind the user cred */ - if (task->tk_msg.rpc_cred != NULL) - rpcauth_holdcred(task); - else if (!(task_setup_data->flags & RPC_TASK_ROOTCREDS)) - rpcauth_bindcred(task); - else - rpcauth_bind_root_cred(task); + rpcauth_bindcred(task, task_setup_data->rpc_message->rpc_cred, task_setup_data->flags); if (task->tk_action == NULL) rpc_call_start(task); } -- cgit v1.2.3 From 9a559efd4199c9812d339e23cc1b6055366b224f Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 12:24:49 -0400 Subject: SUNRPC: Add a generic RPC credential Add an rpc credential that is not tied to any particular auth mechanism, but that can be cached by NFS, and later used to look up a cred for whichever auth mechanism that turns out to be valid when the RPC call is being made. Signed-off-by: Trond Myklebust --- net/sunrpc/Makefile | 2 +- net/sunrpc/auth.c | 1 + net/sunrpc/auth_generic.c | 142 ++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 144 insertions(+), 1 deletion(-) create mode 100644 net/sunrpc/auth_generic.c (limited to 'net/sunrpc') diff --git a/net/sunrpc/Makefile b/net/sunrpc/Makefile index 92e1dbe5094..5369aa369b3 100644 --- a/net/sunrpc/Makefile +++ b/net/sunrpc/Makefile @@ -8,7 +8,7 @@ obj-$(CONFIG_SUNRPC_GSS) += auth_gss/ obj-$(CONFIG_SUNRPC_XPRT_RDMA) += xprtrdma/ sunrpc-y := clnt.o xprt.o socklib.o xprtsock.o sched.o \ - auth.o auth_null.o auth_unix.o \ + auth.o auth_null.o auth_unix.o auth_generic.o \ svc.o svcsock.o svcauth.o svcauth_unix.o \ rpcb_clnt.o timer.o xdr.o \ sunrpc_syms.o cache.o rpc_pipe.o \ diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 1cdb163c4f8..012f2a32063 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -566,6 +566,7 @@ static struct shrinker rpc_cred_shrinker = { void __init rpcauth_init_module(void) { rpc_init_authunix(); + rpc_init_generic_auth(); register_shrinker(&rpc_cred_shrinker); } diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c new file mode 100644 index 00000000000..6f129b1b20a --- /dev/null +++ b/net/sunrpc/auth_generic.c @@ -0,0 +1,142 @@ +/* + * Generic RPC credential + * + * Copyright (C) 2008, Trond Myklebust + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +#ifdef RPC_DEBUG +# define RPCDBG_FACILITY RPCDBG_AUTH +#endif + +struct generic_cred { + struct rpc_cred gc_base; + struct auth_cred acred; +}; + +static struct rpc_auth generic_auth; +static struct rpc_cred_cache generic_cred_cache; +static const struct rpc_credops generic_credops; + +/* + * Public call interface + */ +struct rpc_cred *rpc_lookup_cred(void) +{ + return rpcauth_lookupcred(&generic_auth, 0); +} +EXPORT_SYMBOL_GPL(rpc_lookup_cred); + +/* + * Lookup generic creds for current process + */ +static struct rpc_cred * +generic_lookup_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) +{ + return rpcauth_lookup_credcache(&generic_auth, acred, flags); +} + +static struct rpc_cred * +generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) +{ + struct generic_cred *gcred; + + gcred = kmalloc(sizeof(*gcred), GFP_KERNEL); + if (gcred == NULL) + return ERR_PTR(-ENOMEM); + + rpcauth_init_cred(&gcred->gc_base, acred, &generic_auth, &generic_credops); + gcred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_UPTODATE; + + gcred->acred.uid = acred->uid; + gcred->acred.gid = acred->gid; + gcred->acred.group_info = acred->group_info; + if (gcred->acred.group_info != NULL) + get_group_info(gcred->acred.group_info); + + dprintk("RPC: allocated generic cred %p for uid %d gid %d\n", + gcred, acred->uid, acred->gid); + return &gcred->gc_base; +} + +static void +generic_free_cred(struct rpc_cred *cred) +{ + struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base); + + dprintk("RPC: generic_free_cred %p\n", gcred); + if (gcred->acred.group_info != NULL) + put_group_info(gcred->acred.group_info); + kfree(gcred); +} + +static void +generic_free_cred_callback(struct rcu_head *head) +{ + struct rpc_cred *cred = container_of(head, struct rpc_cred, cr_rcu); + generic_free_cred(cred); +} + +static void +generic_destroy_cred(struct rpc_cred *cred) +{ + call_rcu(&cred->cr_rcu, generic_free_cred_callback); +} + +/* + * Match credentials against current process creds. + */ +static int +generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags) +{ + struct generic_cred *gcred = container_of(cred, struct generic_cred, gc_base); + + if (gcred->acred.uid != acred->uid || + gcred->acred.gid != acred->gid || + gcred->acred.group_info != acred->group_info) + return 0; + return 1; +} + +void __init rpc_init_generic_auth(void) +{ + spin_lock_init(&generic_cred_cache.lock); +} + +void __exit rpc_destroy_generic_auth(void) +{ + rpcauth_clear_credcache(&generic_cred_cache); +} + +static struct rpc_cred_cache generic_cred_cache = { + {{ NULL, },}, +}; + +static const struct rpc_authops generic_auth_ops = { + .owner = THIS_MODULE, +#ifdef RPC_DEBUG + .au_name = "Generic", +#endif + .lookup_cred = generic_lookup_cred, + .crcreate = generic_create_cred, +}; + +static struct rpc_auth generic_auth = { + .au_ops = &generic_auth_ops, + .au_count = ATOMIC_INIT(0), + .au_credcache = &generic_cred_cache, +}; + +static const struct rpc_credops generic_credops = { + .cr_name = "Generic cred", + .crdestroy = generic_destroy_cred, + .crmatch = generic_match, +}; -- cgit v1.2.3 From 5c691044ecbca04dd558fca4c754121689fe1b34 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 16:21:07 -0400 Subject: SUNRPC: Add an rpc_credop callback for binding a credential to an rpc_task We need the ability to treat 'generic' creds specially, since they want to bind instances of the auth cred instead of binding themselves. Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 5 +++-- net/sunrpc/auth_generic.c | 15 +++++++++++++++ net/sunrpc/auth_gss/auth_gss.c | 2 ++ net/sunrpc/auth_null.c | 1 + net/sunrpc/auth_unix.c | 1 + 5 files changed, 22 insertions(+), 2 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 012f2a32063..d65dd794010 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -375,13 +375,14 @@ rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, } EXPORT_SYMBOL_GPL(rpcauth_init_cred); -static void +void rpcauth_generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred) { task->tk_msg.rpc_cred = get_rpccred(cred); dprintk("RPC: %5u holding %s cred %p\n", task->tk_pid, cred->cr_auth->au_ops->au_name, cred); } +EXPORT_SYMBOL_GPL(rpcauth_generic_bind_cred); static void rpcauth_bind_root_cred(struct rpc_task *task) @@ -421,7 +422,7 @@ void rpcauth_bindcred(struct rpc_task *task, struct rpc_cred *cred, int flags) { if (cred != NULL) - rpcauth_generic_bind_cred(task, cred); + cred->cr_ops->crbind(task, cred); else if (flags & RPC_TASK_ROOTCREDS) rpcauth_bind_root_cred(task); else diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c index 6f129b1b20a..6a3f77c9e4d 100644 --- a/net/sunrpc/auth_generic.c +++ b/net/sunrpc/auth_generic.c @@ -35,6 +35,20 @@ struct rpc_cred *rpc_lookup_cred(void) } EXPORT_SYMBOL_GPL(rpc_lookup_cred); +static void +generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred) +{ + struct rpc_auth *auth = task->tk_client->cl_auth; + struct auth_cred *acred = &container_of(cred, struct generic_cred, gc_base)->acred; + struct rpc_cred *ret; + + ret = auth->au_ops->lookup_cred(auth, acred, 0); + if (!IS_ERR(ret)) + task->tk_msg.rpc_cred = ret; + else + task->tk_status = PTR_ERR(ret); +} + /* * Lookup generic creds for current process */ @@ -138,5 +152,6 @@ static struct rpc_auth generic_auth = { static const struct rpc_credops generic_credops = { .cr_name = "Generic cred", .crdestroy = generic_destroy_cred, + .crbind = generic_bind_cred, .crmatch = generic_match, }; diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index ef638496180..d34f6dfc751 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -1300,6 +1300,7 @@ static const struct rpc_credops gss_credops = { .cr_name = "AUTH_GSS", .crdestroy = gss_destroy_cred, .cr_init = gss_cred_init, + .crbind = rpcauth_generic_bind_cred, .crmatch = gss_match, .crmarshal = gss_marshal, .crrefresh = gss_refresh, @@ -1311,6 +1312,7 @@ static const struct rpc_credops gss_credops = { static const struct rpc_credops gss_nullops = { .cr_name = "AUTH_GSS", .crdestroy = gss_destroy_cred, + .crbind = rpcauth_generic_bind_cred, .crmatch = gss_match, .crmarshal = gss_marshal, .crrefresh = gss_refresh_null, diff --git a/net/sunrpc/auth_null.c b/net/sunrpc/auth_null.c index 537d0e8589d..3c26c18df0d 100644 --- a/net/sunrpc/auth_null.c +++ b/net/sunrpc/auth_null.c @@ -125,6 +125,7 @@ static const struct rpc_credops null_credops = { .cr_name = "AUTH_NULL", .crdestroy = nul_destroy_cred, + .crbind = rpcauth_generic_bind_cred, .crmatch = nul_match, .crmarshal = nul_marshal, .crrefresh = nul_refresh, diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c index b763710d3db..04e936a56fb 100644 --- a/net/sunrpc/auth_unix.c +++ b/net/sunrpc/auth_unix.c @@ -237,6 +237,7 @@ static const struct rpc_credops unix_credops = { .cr_name = "AUTH_UNIX", .crdestroy = unx_destroy_cred, + .crbind = rpcauth_generic_bind_cred, .crmatch = unx_match, .crmarshal = unx_marshal, .crrefresh = unx_refresh, -- cgit v1.2.3 From 98a8e3239427051f5d44f2025b398bdcc3918f37 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 12 Mar 2008 12:25:28 -0400 Subject: SUNRPC: Add a helper rpcauth_lookup_generic_cred() The NFSv4 protocol allows clients to negotiate security protocols on the fly in the case where an administrator on the server changes the export settings and/or in the case where we may have a filesystem migration event. Instead of having the NFS client code cache credentials that are tied to a particular AUTH method it is therefore preferable to have a generic credential that can be converted into whatever AUTH is in use by the RPC client when the read/write/sillyrename/... is put on the wire. We do this by means of the new "generic" credential, which basically just caches the minimal information that is needed to look up an RPCSEC_GSS, AUTH_SYS, or AUTH_NULL credential. Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 1 - 1 file changed, 1 deletion(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index d65dd794010..0632cd0a1ad 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -356,7 +356,6 @@ rpcauth_lookupcred(struct rpc_auth *auth, int flags) put_group_info(acred.group_info); return ret; } -EXPORT_SYMBOL_GPL(rpcauth_lookupcred); void rpcauth_init_cred(struct rpc_cred *cred, const struct auth_cred *acred, -- cgit v1.2.3 From 24b74bf0c9e08cbda74d3c64af69ad402ed54e04 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sat, 19 Apr 2008 13:15:47 -0400 Subject: SUNRPC: Fix a bug in call_decode() call_verify() can, under certain circumstances, free the RPC slot. In that case, our cached pointer 'req = task->tk_rqstp' is invalid. Bug was introduced in commit 220bcc2afd7011b3e0569fc178331fa983c92c1b (SUNRPC: Don't call xprt_release in call refresh). Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index ea14314331b..522b06849f8 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1240,10 +1240,13 @@ call_decode(struct rpc_task *task) task->tk_status); return; out_retry: - req->rq_received = req->rq_private_buf.len = 0; task->tk_status = 0; - if (task->tk_client->cl_discrtry) - xprt_force_disconnect(task->tk_xprt); + /* Note: call_verify() may have freed the RPC slot */ + if (task->tk_rqstp == req) { + req->rq_received = req->rq_private_buf.len = 0; + if (task->tk_client->cl_discrtry) + xprt_force_disconnect(task->tk_xprt); + } } /* -- cgit v1.2.3 From b6ddf64ffe9d59577a9176856bb6fe69a539f573 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 17 Apr 2008 18:52:19 -0400 Subject: SUNRPC: Fix up xprt_write_space() The rest of the networking layer uses SOCK_ASYNC_NOSPACE to signal whether or not we have someone waiting for buffer memory. Convert the SUNRPC layer to use the same idiom. Remove the unlikely()s in xs_udp_write_space and xs_tcp_write_space. In fact, the most common case will be that there is nobody waiting for buffer space. SOCK_NOSPACE is there to tell the TCP layer whether or not the cwnd was limited by the application window. Ensure that we follow the same idiom as the rest of the networking layer here too. Finally, ensure that we clear SOCK_ASYNC_NOSPACE once we wake up, so that write_space() doesn't keep waking things up on xprt->pending. Signed-off-by: Trond Myklebust --- net/sunrpc/xprt.c | 4 ++-- net/sunrpc/xprtsock.c | 61 ++++++++++++++++++++++++++++++++++----------------- 2 files changed, 43 insertions(+), 22 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 85199c64702..3ba64f9f84b 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -447,13 +447,13 @@ EXPORT_SYMBOL_GPL(xprt_wake_pending_tasks); * @task: task to be put to sleep * */ -void xprt_wait_for_buffer_space(struct rpc_task *task) +void xprt_wait_for_buffer_space(struct rpc_task *task, rpc_action action) { struct rpc_rqst *req = task->tk_rqstp; struct rpc_xprt *xprt = req->rq_xprt; task->tk_timeout = req->rq_timeout; - rpc_sleep_on(&xprt->pending, task, NULL); + rpc_sleep_on(&xprt->pending, task, action); } EXPORT_SYMBOL_GPL(xprt_wait_for_buffer_space); diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 8bd3b0f73ac..4c2462e2f2b 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -516,6 +516,14 @@ out: return sent; } +static void xs_nospace_callback(struct rpc_task *task) +{ + struct sock_xprt *transport = container_of(task->tk_rqstp->rq_xprt, struct sock_xprt, xprt); + + transport->inet->sk_write_pending--; + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); +} + /** * xs_nospace - place task on wait queue if transmit was incomplete * @task: task to put to sleep @@ -531,20 +539,27 @@ static void xs_nospace(struct rpc_task *task) task->tk_pid, req->rq_slen - req->rq_bytes_sent, req->rq_slen); - if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { - /* Protect against races with write_space */ - spin_lock_bh(&xprt->transport_lock); - - /* Don't race with disconnect */ - if (!xprt_connected(xprt)) - task->tk_status = -ENOTCONN; - else if (test_bit(SOCK_NOSPACE, &transport->sock->flags)) - xprt_wait_for_buffer_space(task); + /* Protect against races with write_space */ + spin_lock_bh(&xprt->transport_lock); + + /* Don't race with disconnect */ + if (xprt_connected(xprt)) { + if (test_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags)) { + /* + * Notify TCP that we're limited by the application + * window size + */ + set_bit(SOCK_NOSPACE, &transport->sock->flags); + transport->inet->sk_write_pending++; + /* ...and wait for more buffer space */ + xprt_wait_for_buffer_space(task, xs_nospace_callback); + } + } else { + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); + task->tk_status = -ENOTCONN; + } - spin_unlock_bh(&xprt->transport_lock); - } else - /* Keep holding the socket if it is blocked */ - rpc_delay(task, HZ>>4); + spin_unlock_bh(&xprt->transport_lock); } /** @@ -588,19 +603,20 @@ static int xs_udp_send_request(struct rpc_task *task) } switch (status) { + case -EAGAIN: + xs_nospace(task); + break; case -ENETUNREACH: case -EPIPE: case -ECONNREFUSED: /* When the server has died, an ICMP port unreachable message * prompts ECONNREFUSED. */ - break; - case -EAGAIN: - xs_nospace(task); + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); break; default: + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); dprintk("RPC: sendmsg returned unrecognized error %d\n", -status); - break; } return status; @@ -695,12 +711,13 @@ static int xs_tcp_send_request(struct rpc_task *task) case -ENOTCONN: case -EPIPE: status = -ENOTCONN; + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); break; default: dprintk("RPC: sendmsg returned unrecognized error %d\n", -status); + clear_bit(SOCK_ASYNC_NOSPACE, &transport->sock->flags); xs_tcp_shutdown(xprt); - break; } return status; @@ -1189,9 +1206,11 @@ static void xs_udp_write_space(struct sock *sk) if (unlikely(!(sock = sk->sk_socket))) goto out; + clear_bit(SOCK_NOSPACE, &sock->flags); + if (unlikely(!(xprt = xprt_from_sock(sk)))) goto out; - if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) + if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) goto out; xprt_write_space(xprt); @@ -1222,9 +1241,11 @@ static void xs_tcp_write_space(struct sock *sk) if (unlikely(!(sock = sk->sk_socket))) goto out; + clear_bit(SOCK_NOSPACE, &sock->flags); + if (unlikely(!(xprt = xprt_from_sock(sk)))) goto out; - if (unlikely(!test_and_clear_bit(SOCK_NOSPACE, &sock->flags))) + if (test_and_clear_bit(SOCK_ASYNC_NOSPACE, &sock->flags) == 0) goto out; xprt_write_space(xprt); -- cgit v1.2.3 From 080a1f148df0615f7a610e4776dd8f3fb706f54f Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Sat, 19 Apr 2008 14:22:31 -0400 Subject: SUNRPC: Don't attempt to destroy expired RPCSEC_GSS credentials.. ..and always destroy using a 'soft' RPC call. Destroying GSS credentials isn't mandatory; the server can always cope with a few credentials not getting destroyed in a timely fashion. This actually fixes a hang situation. Basically, some servers will decide that the client is crazy if it tries to destroy an RPC context for which they have sent an RPCSEC_GSS_CREDPROBLEM, and so will refuse to talk to it for a while. The regression therefor probably was introduced by commit 0df7fb74fbb709591301871a38aac7735a1d6583. Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/auth_gss.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index d34f6dfc751..55948cd5ea5 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -710,7 +710,7 @@ gss_destroying_context(struct rpc_cred *cred) struct rpc_task *task; if (gss_cred->gc_ctx == NULL || - gss_cred->gc_ctx->gc_proc == RPC_GSS_PROC_DESTROY) + test_and_clear_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) == 0) return 0; gss_cred->gc_ctx->gc_proc = RPC_GSS_PROC_DESTROY; @@ -720,7 +720,7 @@ gss_destroying_context(struct rpc_cred *cred) * by the RPC call or by the put_rpccred() below */ get_rpccred(cred); - task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC); + task = rpc_call_null(gss_auth->client, cred, RPC_TASK_ASYNC|RPC_TASK_SOFT); if (!IS_ERR(task)) rpc_put_task(task); -- cgit v1.2.3 From 1e799b673c6b82b336ab13c48b5651d511ca3000 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Fri, 21 Mar 2008 16:19:41 -0400 Subject: SUNRPC: Fix read ordering problems with req->rq_private_buf.len We want to ensure that req->rq_private_buf.len is updated before req->rq_received, so that call_decode() doesn't use an old value for req->rq_rcv_buf.len. In 'call_decode()' itself, instead of using task->tk_status (which is set using req->rq_received) must use the actual value of req->rq_private_buf.len when deciding whether or not the received RPC reply is too short. Finally ensure that we set req->rq_rcv_buf.len to zero when retrying a request. A typo meant that we were resetting req->rq_private_buf.len in call_decode(), and then clobbering that value with the old rq_rcv_buf.len again in xprt_transmit(). Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 26 +++++++++++++------------- net/sunrpc/xprt.c | 3 ++- 2 files changed, 15 insertions(+), 14 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 522b06849f8..3ae56046451 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1199,18 +1199,6 @@ call_decode(struct rpc_task *task) task->tk_flags &= ~RPC_CALL_MAJORSEEN; } - if (task->tk_status < 12) { - if (!RPC_IS_SOFT(task)) { - task->tk_action = call_bind; - clnt->cl_stats->rpcretrans++; - goto out_retry; - } - dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", - clnt->cl_protname, task->tk_status); - task->tk_action = call_timeout; - goto out_retry; - } - /* * Ensure that we see all writes made by xprt_complete_rqst() * before it changed req->rq_received. @@ -1222,6 +1210,18 @@ call_decode(struct rpc_task *task) WARN_ON(memcmp(&req->rq_rcv_buf, &req->rq_private_buf, sizeof(req->rq_rcv_buf)) != 0); + if (req->rq_rcv_buf.len < 12) { + if (!RPC_IS_SOFT(task)) { + task->tk_action = call_bind; + clnt->cl_stats->rpcretrans++; + goto out_retry; + } + dprintk("RPC: %s: too small RPC reply size (%d bytes)\n", + clnt->cl_protname, task->tk_status); + task->tk_action = call_timeout; + goto out_retry; + } + /* Verify the RPC header */ p = call_verify(task); if (IS_ERR(p)) { @@ -1243,7 +1243,7 @@ out_retry: task->tk_status = 0; /* Note: call_verify() may have freed the RPC slot */ if (task->tk_rqstp == req) { - req->rq_received = req->rq_private_buf.len = 0; + req->rq_received = req->rq_rcv_buf.len = 0; if (task->tk_client->cl_discrtry) xprt_force_disconnect(task->tk_xprt); } diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 3ba64f9f84b..5110a4ea7fd 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -757,9 +757,10 @@ void xprt_complete_rqst(struct rpc_task *task, int copied) task->tk_rtt = (long)jiffies - req->rq_xtime; list_del_init(&req->rq_list); + req->rq_private_buf.len = copied; /* Ensure all writes are done before we update req->rq_received */ smp_wmb(); - req->rq_received = req->rq_private_buf.len = copied; + req->rq_received = copied; rpc_wake_up_queued_task(&xprt->pending, task); } EXPORT_SYMBOL_GPL(xprt_complete_rqst); -- cgit v1.2.3 From 78ea323be6380a9313e87fe241809e912e8ae401 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 7 Apr 2008 20:49:28 -0400 Subject: NFSv4: Don't use cred->cr_ops->cr_name in nfs4_proc_setclientid() With the recent change to generic creds, we can no longer use cred->cr_ops->cr_name to distinguish between RPCSEC_GSS principals and AUTH_SYS/AUTH_NULL identities. Replace it with the rpc_authops->au_name instead... Signed-off-by: Trond Myklebust --- net/sunrpc/auth_generic.c | 2 -- net/sunrpc/auth_gss/auth_gss.c | 2 -- net/sunrpc/auth_null.c | 2 -- net/sunrpc/auth_unix.c | 2 -- 4 files changed, 8 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c index 6a3f77c9e4d..b6f124c8507 100644 --- a/net/sunrpc/auth_generic.c +++ b/net/sunrpc/auth_generic.c @@ -136,9 +136,7 @@ static struct rpc_cred_cache generic_cred_cache = { static const struct rpc_authops generic_auth_ops = { .owner = THIS_MODULE, -#ifdef RPC_DEBUG .au_name = "Generic", -#endif .lookup_cred = generic_lookup_cred, .crcreate = generic_create_cred, }; diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 55948cd5ea5..7567eb95823 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -1287,9 +1287,7 @@ out: static const struct rpc_authops authgss_ops = { .owner = THIS_MODULE, .au_flavor = RPC_AUTH_GSS, -#ifdef RPC_DEBUG .au_name = "RPCSEC_GSS", -#endif .create = gss_create, .destroy = gss_destroy, .lookup_cred = gss_lookup_cred, diff --git a/net/sunrpc/auth_null.c b/net/sunrpc/auth_null.c index 3c26c18df0d..c70dd7f5258 100644 --- a/net/sunrpc/auth_null.c +++ b/net/sunrpc/auth_null.c @@ -104,9 +104,7 @@ nul_validate(struct rpc_task *task, __be32 *p) const struct rpc_authops authnull_ops = { .owner = THIS_MODULE, .au_flavor = RPC_AUTH_NULL, -#ifdef RPC_DEBUG .au_name = "NULL", -#endif .create = nul_create, .destroy = nul_destroy, .lookup_cred = nul_lookup_cred, diff --git a/net/sunrpc/auth_unix.c b/net/sunrpc/auth_unix.c index 04e936a56fb..44920b90bdc 100644 --- a/net/sunrpc/auth_unix.c +++ b/net/sunrpc/auth_unix.c @@ -210,9 +210,7 @@ void __init rpc_init_authunix(void) const struct rpc_authops authunix_ops = { .owner = THIS_MODULE, .au_flavor = RPC_AUTH_UNIX, -#ifdef RPC_DEBUG .au_name = "UNIX", -#endif .create = unx_create, .destroy = unx_destroy, .lookup_cred = unx_lookup_cred, -- cgit v1.2.3 From 7c67db3a8a98045744f06fcd6d8f476d9df0ba5c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 7 Apr 2008 20:50:11 -0400 Subject: NFSv4: Reintroduce machine creds We need to try to ensure that we always use the same credentials whenever we re-establish the clientid on the server. If not, the server won't recognise that we're the same client, and so may not allow us to recover state. Signed-off-by: Trond Myklebust --- net/sunrpc/auth_generic.c | 26 ++++++++++++++++++++++++-- net/sunrpc/auth_gss/auth_gss.c | 12 +++++++++++- 2 files changed, 35 insertions(+), 3 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_generic.c b/net/sunrpc/auth_generic.c index b6f124c8507..d927d9f5741 100644 --- a/net/sunrpc/auth_generic.c +++ b/net/sunrpc/auth_generic.c @@ -17,6 +17,9 @@ # define RPCDBG_FACILITY RPCDBG_AUTH #endif +#define RPC_ANONYMOUS_USERID ((uid_t)-2) +#define RPC_ANONYMOUS_GROUPID ((gid_t)-2) + struct generic_cred { struct rpc_cred gc_base; struct auth_cred acred; @@ -35,6 +38,22 @@ struct rpc_cred *rpc_lookup_cred(void) } EXPORT_SYMBOL_GPL(rpc_lookup_cred); +/* + * Public call interface for looking up machine creds. + */ +struct rpc_cred *rpc_lookup_machine_cred(void) +{ + struct auth_cred acred = { + .uid = RPC_ANONYMOUS_USERID, + .gid = RPC_ANONYMOUS_GROUPID, + .machine_cred = 1, + }; + + dprintk("RPC: looking up machine cred\n"); + return generic_auth.au_ops->lookup_cred(&generic_auth, &acred, 0); +} +EXPORT_SYMBOL_GPL(rpc_lookup_machine_cred); + static void generic_bind_cred(struct rpc_task *task, struct rpc_cred *cred) { @@ -75,8 +94,10 @@ generic_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) gcred->acred.group_info = acred->group_info; if (gcred->acred.group_info != NULL) get_group_info(gcred->acred.group_info); + gcred->acred.machine_cred = acred->machine_cred; - dprintk("RPC: allocated generic cred %p for uid %d gid %d\n", + dprintk("RPC: allocated %s cred %p for uid %d gid %d\n", + gcred->acred.machine_cred ? "machine" : "generic", gcred, acred->uid, acred->gid); return &gcred->gc_base; } @@ -115,7 +136,8 @@ generic_match(struct auth_cred *acred, struct rpc_cred *cred, int flags) if (gcred->acred.uid != acred->uid || gcred->acred.gid != acred->gid || - gcred->acred.group_info != acred->group_info) + gcred->acred.group_info != acred->group_info || + gcred->acred.machine_cred != acred->machine_cred) return 0; return 1; } diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 7567eb95823..46f7ec800af 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -371,9 +371,16 @@ gss_alloc_msg(struct gss_auth *gss_auth, uid_t uid) static struct gss_upcall_msg * gss_setup_upcall(struct rpc_clnt *clnt, struct gss_auth *gss_auth, struct rpc_cred *cred) { + struct gss_cred *gss_cred = container_of(cred, + struct gss_cred, gc_base); struct gss_upcall_msg *gss_new, *gss_msg; + uid_t uid = cred->cr_uid; - gss_new = gss_alloc_msg(gss_auth, cred->cr_uid); + /* Special case: rpc.gssd assumes that uid == 0 implies machine creds */ + if (gss_cred->gc_machine_cred != 0) + uid = 0; + + gss_new = gss_alloc_msg(gss_auth, uid); if (gss_new == NULL) return ERR_PTR(-ENOMEM); gss_msg = gss_add_msg(gss_auth, gss_new); @@ -818,6 +825,7 @@ gss_create_cred(struct rpc_auth *auth, struct auth_cred *acred, int flags) */ cred->gc_base.cr_flags = 1UL << RPCAUTH_CRED_NEW; cred->gc_service = gss_auth->service; + cred->gc_machine_cred = acred->machine_cred; kref_get(&gss_auth->kref); return &cred->gc_base; @@ -855,6 +863,8 @@ gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) return 0; out: + if (acred->machine_cred != gss_cred->gc_machine_cred) + return 0; return (rc->cr_uid == acred->uid); } -- cgit v1.2.3 From d2b831416365e8b1f27809b62d5e4260883956cc Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 14 Apr 2008 18:13:37 -0400 Subject: SUNRPC: Protect creds against early garbage collection Signed-off-by: Trond Myklebust --- net/sunrpc/auth.c | 8 ++++++++ 1 file changed, 8 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth.c b/net/sunrpc/auth.c index 0632cd0a1ad..6bfea9ed686 100644 --- a/net/sunrpc/auth.c +++ b/net/sunrpc/auth.c @@ -220,6 +220,9 @@ rpcauth_destroy_credcache(struct rpc_auth *auth) } EXPORT_SYMBOL_GPL(rpcauth_destroy_credcache); + +#define RPC_AUTH_EXPIRY_MORATORIUM (60 * HZ) + /* * Remove stale credentials. Avoid sleeping inside the loop. */ @@ -228,6 +231,7 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan) { spinlock_t *cache_lock; struct rpc_cred *cred; + unsigned long expired = jiffies - RPC_AUTH_EXPIRY_MORATORIUM; while (!list_empty(&cred_unused)) { cred = list_entry(cred_unused.next, struct rpc_cred, cr_lru); @@ -235,6 +239,10 @@ rpcauth_prune_expired(struct list_head *free, int nr_to_scan) number_cred_unused--; if (atomic_read(&cred->cr_count) != 0) continue; + /* Enforce a 5 second garbage collection moratorium */ + if (time_in_range(cred->cr_expire, expired, jiffies) && + test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) != 0) + continue; cache_lock = &cred->cr_auth->au_credcache->lock; spin_lock(cache_lock); if (atomic_read(&cred->cr_count) == 0) { -- cgit v1.2.3 From 06b4b681ababc20596aa947595714710f557131d Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Wed, 16 Apr 2008 16:51:38 -0400 Subject: SUNRPC: remove XS_SENDMSG_RETRY The condition for exiting from the loop in xs_tcp_send_request() should be that we find we're not making progress (i.e. number of bytes sent is 0). Signed-off-by: Trond Myklebust --- net/sunrpc/xprtsock.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 4c2462e2f2b..4a567a93e6a 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -135,12 +135,6 @@ static ctl_table sunrpc_table[] = { #endif -/* - * How many times to try sending a request on a socket before waiting - * for the socket buffer to clear. - */ -#define XS_SENDMSG_RETRY (10U) - /* * Time out for an RPC UDP socket connect. UDP socket connects are * synchronous, but we set a timeout anyway in case of resource @@ -666,7 +660,6 @@ static int xs_tcp_send_request(struct rpc_task *task) struct sock_xprt *transport = container_of(xprt, struct sock_xprt, xprt); struct xdr_buf *xdr = &req->rq_snd_buf; int status; - unsigned int retry = 0; xs_encode_tcp_record_marker(&req->rq_snd_buf); @@ -697,9 +690,10 @@ static int xs_tcp_send_request(struct rpc_task *task) return 0; } + if (status != 0) + continue; status = -EAGAIN; - if (retry++ > XS_SENDMSG_RETRY) - break; + break; } switch (status) { -- cgit v1.2.3 From 636ac43318ce6939c1698fb67e714d421314ed71 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 17 Apr 2008 14:00:47 -0400 Subject: SUNRPC: Remove the unused export of xprt_force_disconnect Signed-off-by: Trond Myklebust --- net/sunrpc/xprt.c | 1 - 1 file changed, 1 deletion(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 5110a4ea7fd..a0646a3b4a3 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -605,7 +605,6 @@ void xprt_force_disconnect(struct rpc_xprt *xprt) xprt_wake_pending_tasks(xprt, -ENOTCONN); spin_unlock_bh(&xprt->transport_lock); } -EXPORT_SYMBOL_GPL(xprt_force_disconnect); static void xprt_init_autodisconnect(unsigned long data) -- cgit v1.2.3 From 7c1d71cf56feebfb5b98219b9d11dfc3a2feca62 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 17 Apr 2008 16:52:57 -0400 Subject: SUNRPC: Don't disconnect more than once if retransmitting NFSv4 requests NFSv4 requires us to ensure that we break the TCP connection before we're allowed to retransmit a request. However in the case where we're retransmitting several requests that have been sent on the same connection, we need to ensure that we don't interfere with the attempt to reconnect and/or break the connection again once it has been established. We therefore introduce a 'connection' cookie that is bumped every time a connection is broken. This allows requests to track if they need to force a disconnection. Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 6 ++++-- net/sunrpc/xprt.c | 29 +++++++++++++++++++++++++++++ net/sunrpc/xprtsock.c | 2 ++ 3 files changed, 35 insertions(+), 2 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 3ae56046451..8773b4342c9 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1120,7 +1120,8 @@ call_status(struct rpc_task *task) case -ETIMEDOUT: task->tk_action = call_timeout; if (task->tk_client->cl_discrtry) - xprt_force_disconnect(task->tk_xprt); + xprt_conditional_disconnect(task->tk_xprt, + req->rq_connect_cookie); break; case -ECONNREFUSED: case -ENOTCONN: @@ -1245,7 +1246,8 @@ out_retry: if (task->tk_rqstp == req) { req->rq_received = req->rq_rcv_buf.len = 0; if (task->tk_client->cl_discrtry) - xprt_force_disconnect(task->tk_xprt); + xprt_conditional_disconnect(task->tk_xprt, + req->rq_connect_cookie); } } diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index a0646a3b4a3..75d748eee0e 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -606,6 +606,34 @@ void xprt_force_disconnect(struct rpc_xprt *xprt) spin_unlock_bh(&xprt->transport_lock); } +/** + * xprt_conditional_disconnect - force a transport to disconnect + * @xprt: transport to disconnect + * @cookie: 'connection cookie' + * + * This attempts to break the connection if and only if 'cookie' matches + * the current transport 'connection cookie'. It ensures that we don't + * try to break the connection more than once when we need to retransmit + * a batch of RPC requests. + * + */ +void xprt_conditional_disconnect(struct rpc_xprt *xprt, unsigned int cookie) +{ + /* Don't race with the test_bit() in xprt_clear_locked() */ + spin_lock_bh(&xprt->transport_lock); + if (cookie != xprt->connect_cookie) + goto out; + if (test_bit(XPRT_CLOSING, &xprt->state) || !xprt_connected(xprt)) + goto out; + set_bit(XPRT_CLOSE_WAIT, &xprt->state); + /* Try to schedule an autoclose RPC call */ + if (test_and_set_bit(XPRT_LOCKED, &xprt->state) == 0) + queue_work(rpciod_workqueue, &xprt->task_cleanup); + xprt_wake_pending_tasks(xprt, -ENOTCONN); +out: + spin_unlock_bh(&xprt->transport_lock); +} + static void xprt_init_autodisconnect(unsigned long data) { @@ -849,6 +877,7 @@ void xprt_transmit(struct rpc_task *task) } else if (!req->rq_bytes_sent) return; + req->rq_connect_cookie = xprt->connect_cookie; status = xprt->ops->send_request(task); if (status == 0) { dprintk("RPC: %5u xmit complete\n", task->tk_pid); diff --git a/net/sunrpc/xprtsock.c b/net/sunrpc/xprtsock.c index 4a567a93e6a..63d79e347c0 100644 --- a/net/sunrpc/xprtsock.c +++ b/net/sunrpc/xprtsock.c @@ -1142,6 +1142,7 @@ static void xs_tcp_state_change(struct sock *sk) break; case TCP_FIN_WAIT1: /* The client initiated a shutdown of the socket */ + xprt->connect_cookie++; xprt->reestablish_timeout = 0; set_bit(XPRT_CLOSING, &xprt->state); smp_mb__before_clear_bit(); @@ -1154,6 +1155,7 @@ static void xs_tcp_state_change(struct sock *sk) set_bit(XPRT_CLOSING, &xprt->state); xprt_force_disconnect(xprt); case TCP_SYN_SENT: + xprt->connect_cookie++; case TCP_CLOSING: /* * If the server closed down the connection, make sure that -- cgit v1.2.3 From 7b6962b0a6000df48c8a5fd967d262f77704101b Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 17 Apr 2008 16:53:01 -0400 Subject: SUNRPC: Fix a race in gss_refresh_upcall() If the downcall completes before we get the spin_lock then we currently fail to refresh the credential. Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/auth_gss.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 46f7ec800af..6f1b4e2f5e8 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -117,6 +117,7 @@ gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) struct gss_cl_ctx *old; old = gss_cred->gc_ctx; + gss_get_ctx(ctx); rcu_assign_pointer(gss_cred->gc_ctx, ctx); set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); @@ -340,7 +341,7 @@ gss_upcall_callback(struct rpc_task *task) spin_lock(&inode->i_lock); if (gss_msg->ctx) - gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_get_ctx(gss_msg->ctx)); + gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); else task->tk_status = gss_msg->msg.errno; gss_cred->gc_upcall = NULL; @@ -417,7 +418,11 @@ gss_refresh_upcall(struct rpc_task *task) spin_lock(&inode->i_lock); if (gss_cred->gc_upcall != NULL) rpc_sleep_on(&gss_cred->gc_upcall->rpc_waitqueue, task, NULL); - else if (gss_msg->ctx == NULL && gss_msg->msg.errno >= 0) { + else if (gss_msg->ctx != NULL) { + gss_cred_set_ctx(task->tk_msg.rpc_cred, gss_msg->ctx); + gss_cred->gc_upcall = NULL; + rpc_wake_up_status(&gss_msg->rpc_waitqueue, gss_msg->msg.errno); + } else if (gss_msg->msg.errno >= 0) { task->tk_timeout = 0; gss_cred->gc_upcall = gss_msg; /* gss_upcall_callback will release the reference to gss_upcall_msg */ @@ -462,7 +467,7 @@ gss_create_upcall(struct gss_auth *gss_auth, struct gss_cred *gss_cred) schedule(); } if (gss_msg->ctx) - gss_cred_set_ctx(cred, gss_get_ctx(gss_msg->ctx)); + gss_cred_set_ctx(cred, gss_msg->ctx); else err = gss_msg->msg.errno; spin_unlock(&inode->i_lock); -- cgit v1.2.3 From cd019f7517206a74d8cdb64d5c82b1f76be608cc Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Thu, 17 Apr 2008 17:03:58 -0400 Subject: SUNRPC: Don't change the RPCSEC_GSS context on a credential that is in use When a server rejects our credential with an AUTH_REJECTEDCRED or similar, we need to refresh the credential and then retry the request. However, we do want to allow any requests that are in flight to finish executing, so that we can at least attempt to process the replies that depend on this instance of the credential. The solution is to ensure that gss_refresh() looks up an entirely new RPCSEC_GSS credential instead of attempting to create a context for the existing invalid credential. Signed-off-by: Trond Myklebust --- net/sunrpc/auth_gss/auth_gss.c | 69 +++++++++++++++++++++++++----------------- 1 file changed, 42 insertions(+), 27 deletions(-) (limited to 'net/sunrpc') diff --git a/net/sunrpc/auth_gss/auth_gss.c b/net/sunrpc/auth_gss/auth_gss.c index 6f1b4e2f5e8..621c07f322c 100644 --- a/net/sunrpc/auth_gss/auth_gss.c +++ b/net/sunrpc/auth_gss/auth_gss.c @@ -114,28 +114,14 @@ static void gss_cred_set_ctx(struct rpc_cred *cred, struct gss_cl_ctx *ctx) { struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); - struct gss_cl_ctx *old; - old = gss_cred->gc_ctx; + if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) + return; gss_get_ctx(ctx); rcu_assign_pointer(gss_cred->gc_ctx, ctx); set_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags); + smp_mb__before_clear_bit(); clear_bit(RPCAUTH_CRED_NEW, &cred->cr_flags); - if (old) - gss_put_ctx(old); -} - -static int -gss_cred_is_uptodate_ctx(struct rpc_cred *cred) -{ - struct gss_cred *gss_cred = container_of(cred, struct gss_cred, gc_base); - int res = 0; - - rcu_read_lock(); - if (test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags) && gss_cred->gc_ctx) - res = 1; - rcu_read_unlock(); - return res; } static const void * @@ -857,15 +843,12 @@ gss_match(struct auth_cred *acred, struct rpc_cred *rc, int flags) { struct gss_cred *gss_cred = container_of(rc, struct gss_cred, gc_base); - /* - * If the searchflags have set RPCAUTH_LOOKUP_NEW, then - * we don't really care if the credential has expired or not, - * since the caller should be prepared to reinitialise it. - */ - if ((flags & RPCAUTH_LOOKUP_NEW) && test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) + if (test_bit(RPCAUTH_CRED_NEW, &rc->cr_flags)) goto out; /* Don't match with creds that have expired. */ - if (gss_cred->gc_ctx && time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) + if (time_after(jiffies, gss_cred->gc_ctx->gc_expiry)) + return 0; + if (!test_bit(RPCAUTH_CRED_UPTODATE, &rc->cr_flags)) return 0; out: if (acred->machine_cred != gss_cred->gc_machine_cred) @@ -933,16 +916,48 @@ out_put_ctx: return NULL; } +static int gss_renew_cred(struct rpc_task *task) +{ + struct rpc_cred *oldcred = task->tk_msg.rpc_cred; + struct gss_cred *gss_cred = container_of(oldcred, + struct gss_cred, + gc_base); + struct rpc_auth *auth = oldcred->cr_auth; + struct auth_cred acred = { + .uid = oldcred->cr_uid, + .machine_cred = gss_cred->gc_machine_cred, + }; + struct rpc_cred *new; + + new = gss_lookup_cred(auth, &acred, RPCAUTH_LOOKUP_NEW); + if (IS_ERR(new)) + return PTR_ERR(new); + task->tk_msg.rpc_cred = new; + put_rpccred(oldcred); + return 0; +} + /* * Refresh credentials. XXX - finish */ static int gss_refresh(struct rpc_task *task) { + struct rpc_cred *cred = task->tk_msg.rpc_cred; + int ret = 0; + + if (!test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags) && + !test_bit(RPCAUTH_CRED_UPTODATE, &cred->cr_flags)) { + ret = gss_renew_cred(task); + if (ret < 0) + goto out; + cred = task->tk_msg.rpc_cred; + } - if (!gss_cred_is_uptodate_ctx(task->tk_msg.rpc_cred)) - return gss_refresh_upcall(task); - return 0; + if (test_bit(RPCAUTH_CRED_NEW, &cred->cr_flags)) + ret = gss_refresh_upcall(task); +out: + return ret; } /* Dummy refresh routine: used only when destroying the context */ -- cgit v1.2.3 From b48633bd086d21f4a2a5bea96c7e6c7ba58eb60c Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Tue, 22 Apr 2008 16:47:55 -0400 Subject: SUNRPC: Invalidate the RPCSEC_GSS session if the server dropped the request RFC 2203 requires the server to drop the request if it believes the RPCSEC_GSS context is out of sequence. The problem is that we have no way on the client to know why the server dropped the request. In order to avoid spinning forever trying to resend the request, the safe approach is therefore to always invalidate the RPCSEC_GSS context on every major timeout. Signed-off-by: Trond Myklebust --- net/sunrpc/clnt.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'net/sunrpc') diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c index 8773b4342c9..c6efb982057 100644 --- a/net/sunrpc/clnt.c +++ b/net/sunrpc/clnt.c @@ -1173,6 +1173,11 @@ call_timeout(struct rpc_task *task) clnt->cl_protname, clnt->cl_server); } rpc_force_rebind(clnt); + /* + * Did our request time out due to an RPCSEC_GSS out-of-sequence + * event? RFC2203 requires the server to drop all such requests. + */ + rpcauth_invalcred(task); retry: clnt->cl_stats->rpcretrans++; -- cgit v1.2.3