Add SIGSTOP and SIGTSTP handling to issig

This change adds SIGSTOP and SIGTSTP handling to the issig function; 
this mirrors its behavior on Solaris. This way, long running kernel 
tasks can be stopped with the appropriate signals. Note that doing 
so with ctrl-z on the command line doesn't return control of the tty 
to the shell, because tty handling is done separately from stopping 
the process. That can be future work, if people feel that it is a 
necessary addition.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matthew Ahrens <mahrens@delphix.com>
Signed-off-by: Paul Dagnelie <pcd@delphix.com>
Issue #810 
Issue #10843 
Closes #11801

config/kernel-siginfo.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.20 API change
+dnl # Added kernel_siginfo_t
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SIGINFO], [
+	ZFS_LINUX_TEST_SRC([siginfo], [
+		#include <linux/signal_types.h>
+	],[
+		kernel_siginfo_t info __attribute__ ((unused));
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SIGINFO], [
+	AC_MSG_CHECKING([whether kernel_siginfo_t tyepedef exists])
+	ZFS_LINUX_TEST_RESULT([siginfo], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SIGINFO, 1, [kernel_siginfo_t exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-signal-stop.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.4 API change
+dnl # Added kernel_signal_stop
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SIGNAL_STOP], [
+	ZFS_LINUX_TEST_SRC([signal_stop], [
+		#include <linux/sched/signal.h>
+	],[
+		kernel_signal_stop();
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SIGNAL_STOP], [
+	AC_MSG_CHECKING([whether signal_stop() exists])
+	ZFS_LINUX_TEST_RESULT([signal_stop], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SIGNAL_STOP, 1, [signal_stop() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel-special-state.m4

@@ -0,0 +1,21 @@
+dnl #
+dnl # 4.17 API change
+dnl # Added set_special_state() function
+dnl #
+AC_DEFUN([ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE], [
+	ZFS_LINUX_TEST_SRC([set_special_state], [
+		#include <linux/sched.h>
+	],[
+		set_special_state(TASK_STOPPED);
+	])
+])
+
+AC_DEFUN([ZFS_AC_KERNEL_SET_SPECIAL_STATE], [
+	AC_MSG_CHECKING([whether set_special_state() exists])
+	ZFS_LINUX_TEST_RESULT([set_special_state], [
+		AC_MSG_RESULT(yes)
+		AC_DEFINE(HAVE_SET_SPECIAL_STATE, 1, [set_special_state() exists])
+	],[
+		AC_MSG_RESULT(no)
+	])
+])

config/kernel.m4

@@ -129,6 +129,9 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_SRC], [
 	ZFS_AC_KERNEL_SRC_MKNOD
 	ZFS_AC_KERNEL_SRC_SYMLINK
 	ZFS_AC_KERNEL_SRC_BIO_MAX_SEGS
+	ZFS_AC_KERNEL_SRC_SIGNAL_STOP
+	ZFS_AC_KERNEL_SRC_SIGINFO
+	ZFS_AC_KERNEL_SRC_SET_SPECIAL_STATE
 
 	AC_MSG_CHECKING([for available kernel interfaces])
 	ZFS_LINUX_TEST_COMPILE_ALL([kabi])
@@ -231,6 +234,9 @@ AC_DEFUN([ZFS_AC_KERNEL_TEST_RESULT], [
 	ZFS_AC_KERNEL_MKNOD
 	ZFS_AC_KERNEL_SYMLINK
 	ZFS_AC_KERNEL_BIO_MAX_SEGS
+	ZFS_AC_KERNEL_SIGNAL_STOP
+	ZFS_AC_KERNEL_SIGINFO
+	ZFS_AC_KERNEL_SET_SPECIAL_STATE
 ])
 
 dnl #

include/os/linux/spl/sys/signal.h

@@ -33,22 +33,6 @@
 #define	FORREAL		0	/* Usual side-effects */
 #define	JUSTLOOKING	1	/* Don't stop the process */
 
-/*
+extern int issig(int why);
- * The "why" argument indicates the allowable side-effects of the call:
- *
- * FORREAL:  Extract the next pending signal from p_sig into p_cursig;
- * stop the process if a stop has been requested or if a traced signal
- * is pending.
- *
- * JUSTLOOKING:  Don't stop the process, just indicate whether or not
- * a signal might be pending (FORREAL is needed to tell for sure).
- */
-static __inline__ int
-issig(int why)
-{
-	ASSERT(why == FORREAL || why == JUSTLOOKING);
-
-	return (signal_pending(current));
-}
 
 #endif /* SPL_SIGNAL_H */

include/os/linux/spl/sys/thread.h

@@ -70,4 +70,17 @@ extern struct task_struct *spl_kthread_create(int (*func)(void *),
 
 extern proc_t p0;
 
+#ifdef HAVE_SIGINFO
+typedef kernel_siginfo_t spl_kernel_siginfo_t;
+#else
+typedef siginfo_t spl_kernel_siginfo_t;
+#endif
+
+#ifdef HAVE_SET_SPECIAL_STATE
+#define	spl_set_special_state(x) set_special_state((x))
+#else
+#define	spl_set_special_state(x) __set_current_state((x))
+#endif
+
+
 #endif  /* _SPL_THREAD_H */

module/os/linux/spl/spl-thread.c

@@ -158,3 +158,54 @@ spl_kthread_create(int (*func)(void *), void *data, const char namefmt[], ...)
 	} while (1);
 }
 EXPORT_SYMBOL(spl_kthread_create);
+
+/*
+ * The "why" argument indicates the allowable side-effects of the call:
+ *
+ * FORREAL:  Extract the next pending signal from p_sig into p_cursig;
+ * stop the process if a stop has been requested or if a traced signal
+ * is pending.
+ *
+ * JUSTLOOKING:  Don't stop the process, just indicate whether or not
+ * a signal might be pending (FORREAL is needed to tell for sure).
+ */
+int
+issig(int why)
+{
+	ASSERT(why == FORREAL || why == JUSTLOOKING);
+
+	if (!signal_pending(current))
+		return (0);
+
+	if (why != FORREAL)
+		return (1);
+
+	struct task_struct *task = current;
+	spl_kernel_siginfo_t __info;
+	sigset_t set;
+	siginitsetinv(&set, 1ULL << (SIGSTOP - 1) | 1ULL << (SIGTSTP - 1));
+	sigorsets(&set, &task->blocked, &set);
+
+	spin_lock_irq(&task->sighand->siglock);
+	int ret;
+	if ((ret = dequeue_signal(task, &set, &__info)) != 0) {
+#ifdef HAVE_SIGNAL_STOP
+		spin_unlock_irq(&task->sighand->siglock);
+		kernel_signal_stop();
+#else
+		if (current->jobctl & JOBCTL_STOP_DEQUEUED)
+			spl_set_special_state(TASK_STOPPED);
+
+		spin_unlock_irq(&current->sighand->siglock);
+
+		schedule();
+#endif
+		return (0);
+	}
+
+	spin_unlock_irq(&task->sighand->siglock);
+
+	return (1);
+}
+
+EXPORT_SYMBOL(issig);