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authorTrond Myklebust <Trond.Myklebust@netapp.com>2005-06-22 17:16:28 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2005-06-22 16:07:30 -0400
commit14b218a8e4f110206c46e586a3da372f665631e7 (patch)
tree4a021ff7df8e4e6e4abdb4961575226db7d5452f /net/sunrpc
parent455a396710b71a743b28da2ed2185e5a9b38e26f (diff)
[PATCH] RPC: Ensure rpc calls respects the RPC_NOINTR flag
For internal purposes, the rpc_clnt_sigmask() call is replaced by a call to rpc_task_sigmask(), which ensures that the current task sigmask respects both the client cl_intr flag and the per-task NOINTR flag. Problem noted by Jiaying Zhang. Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc')
-rw-r--r--net/sunrpc/clnt.c71
1 files changed, 37 insertions, 34 deletions
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index c979fcf8879..f17e6153b68 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -378,38 +378,41 @@ rpc_default_callback(struct rpc_task *task)
}
/*
- * Export the signal mask handling for aysnchronous code that
+ * Export the signal mask handling for synchronous code that
* sleeps on RPC calls
*/
+#define RPC_INTR_SIGNALS (sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGKILL))
+static void rpc_save_sigmask(sigset_t *oldset, int intr)
+{
+ unsigned long sigallow = 0;
+ sigset_t sigmask;
+
+ /* Block all signals except those listed in sigallow */
+ if (intr)
+ sigallow |= RPC_INTR_SIGNALS;
+ siginitsetinv(&sigmask, sigallow);
+ sigprocmask(SIG_BLOCK, &sigmask, oldset);
+}
+
+static inline void rpc_task_sigmask(struct rpc_task *task, sigset_t *oldset)
+{
+ rpc_save_sigmask(oldset, !RPC_TASK_UNINTERRUPTIBLE(task));
+}
+
+static inline void rpc_restore_sigmask(sigset_t *oldset)
+{
+ sigprocmask(SIG_SETMASK, oldset, NULL);
+}
+
void rpc_clnt_sigmask(struct rpc_clnt *clnt, sigset_t *oldset)
{
- unsigned long sigallow = sigmask(SIGKILL);
- unsigned long irqflags;
-
- /* Turn off various signals */
- if (clnt->cl_intr) {
- struct k_sigaction *action = current->sighand->action;
- if (action[SIGINT-1].sa.sa_handler == SIG_DFL)
- sigallow |= sigmask(SIGINT);
- if (action[SIGQUIT-1].sa.sa_handler == SIG_DFL)
- sigallow |= sigmask(SIGQUIT);
- }
- spin_lock_irqsave(&current->sighand->siglock, irqflags);
- *oldset = current->blocked;
- siginitsetinv(&current->blocked, sigallow & ~oldset->sig[0]);
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
+ rpc_save_sigmask(oldset, clnt->cl_intr);
}
void rpc_clnt_sigunmask(struct rpc_clnt *clnt, sigset_t *oldset)
{
- unsigned long irqflags;
-
- spin_lock_irqsave(&current->sighand->siglock, irqflags);
- current->blocked = *oldset;
- recalc_sigpending();
- spin_unlock_irqrestore(&current->sighand->siglock, irqflags);
+ rpc_restore_sigmask(oldset);
}
/*
@@ -427,26 +430,26 @@ int rpc_call_sync(struct rpc_clnt *clnt, struct rpc_message *msg, int flags)
BUG_ON(flags & RPC_TASK_ASYNC);
- rpc_clnt_sigmask(clnt, &oldset);
-
status = -ENOMEM;
task = rpc_new_task(clnt, NULL, flags);
if (task == NULL)
goto out;
+ /* Mask signals on RPC calls _and_ GSS_AUTH upcalls */
+ rpc_task_sigmask(task, &oldset);
+
rpc_call_setup(task, msg, 0);
/* Set up the call info struct and execute the task */
- if (task->tk_status == 0)
+ if (task->tk_status == 0) {
status = rpc_execute(task);
- else {
+ } else {
status = task->tk_status;
rpc_release_task(task);
}
+ rpc_restore_sigmask(&oldset);
out:
- rpc_clnt_sigunmask(clnt, &oldset);
-
return status;
}
@@ -467,8 +470,6 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
flags |= RPC_TASK_ASYNC;
- rpc_clnt_sigmask(clnt, &oldset);
-
/* Create/initialize a new RPC task */
if (!callback)
callback = rpc_default_callback;
@@ -477,6 +478,9 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
goto out;
task->tk_calldata = data;
+ /* Mask signals on GSS_AUTH upcalls */
+ rpc_task_sigmask(task, &oldset);
+
rpc_call_setup(task, msg, 0);
/* Set up the call info struct and execute the task */
@@ -486,9 +490,8 @@ rpc_call_async(struct rpc_clnt *clnt, struct rpc_message *msg, int flags,
else
rpc_release_task(task);
+ rpc_restore_sigmask(&oldset);
out:
- rpc_clnt_sigunmask(clnt, &oldset);
-
return status;
}
@@ -666,7 +669,7 @@ call_allocate(struct rpc_task *task)
return;
printk(KERN_INFO "RPC: buffer allocation failed for task %p\n", task);
- if (RPC_IS_ASYNC(task) || !(task->tk_client->cl_intr && signalled())) {
+ if (RPC_IS_ASYNC(task) || !signalled()) {
xprt_release(task);
task->tk_action = call_reserve;
rpc_delay(task, HZ>>4);