[PATCH 0/4] assorted TTY code cleanups

[PATCH 0/4] assorted TTY code cleanups

[Nicolas Pitre]

Those are, I hope, fairly uncontrovertial patches that should require very
little review as they mostly do code movement providing nice cleanups.
No logical changes are introduced by those patches.

My minitty patch series is based on top of this, and given the timing,
I don't expect it to go upstream just yet. However the following patches
could be merged separately for the next merge window.

Overall diffstat:

 drivers/tty/Makefile        |   3 +-
 drivers/tty/serial/Makefile |   3 +-
 drivers/tty/tty_baudrate.c  | 232 ++++++++++++++++++
 drivers/tty/tty_io.c        | 571 +-------------------------------------------
 drivers/tty/tty_ioctl.c     | 222 -----------------
 drivers/tty/tty_jobctrl.c   | 554 ++++++++++++++++++++++++++++++++++++++++++
 include/linux/console.h     |   2 +
 include/linux/tty.h         |  13 +-
 init/main.c                 |   2 +-
 kernel/printk/printk.c      |  24 ++
 10 files changed, 838 insertions(+), 788 deletions(-)

[PATCH 1/4] console: move console_init() out of tty_io.c

[Nicolas Pitre]

All the console driver handling code lives in printk.c.
Move console_init() there as well so console support can still be used
when the TTY code is configured out. No logical changes from this patch.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
 drivers/tty/tty_io.c    | 24 ------------------------
 include/linux/console.h |  2 ++
 include/linux/tty.h     |  7 ++++---
 init/main.c             |  2 +-
 kernel/printk/printk.c  | 24 ++++++++++++++++++++++++
 5 files changed, 31 insertions(+), 28 deletions(-)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index e6d1a65108..2100295861 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -3578,30 +3578,6 @@ void tty_default_fops(struct file_operations *fops)
 	*fops = tty_fops;
 }
 
-/*
- * Initialize the console device. This is called *early*, so
- * we can't necessarily depend on lots of kernel help here.
- * Just do some early initializations, and do the complex setup
- * later.
- */
-void __init console_init(void)
-{
-	initcall_t *call;
-
-	/* Setup the default TTY line discipline. */
-	n_tty_init();
-
-	/*
-	 * set up the console device so that later boot sequences can
-	 * inform about problems etc..
-	 */
-	call = __con_initcall_start;
-	while (call < __con_initcall_end) {
-		(*call)();
-		call++;
-	}
-}
-
 static char *tty_devnode(struct device *dev, umode_t *mode)
 {
 	if (!mode)
diff --git a/include/linux/console.h b/include/linux/console.h
index 5949d18555..b8920a031a 100644
--- a/include/linux/console.h
+++ b/include/linux/console.h
@@ -212,4 +212,6 @@ extern bool vgacon_text_force(void);
 static inline bool vgacon_text_force(void) { return false; }
 #endif
 
+extern void console_init(void);
+
 #endif /* _LINUX_CONSOLE_H */
diff --git a/include/linux/tty.h b/include/linux/tty.h
index 1017e904c0..f1106d7c73 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -390,7 +390,6 @@ static inline bool tty_throttled(struct tty_struct *tty)
 }
 
 #ifdef CONFIG_TTY
-extern void console_init(void);
 extern void tty_kref_put(struct tty_struct *tty);
 extern struct pid *tty_get_pgrp(struct tty_struct *tty);
 extern void tty_vhangup_self(void);
@@ -402,8 +401,6 @@ extern struct tty_struct *get_current_tty(void);
 extern int __init tty_init(void);
 extern const char *tty_name(const struct tty_struct *tty);
 #else
-static inline void console_init(void)
-{ }
 static inline void tty_kref_put(struct tty_struct *tty)
 { }
 static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
@@ -669,7 +666,11 @@ extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
 
 /* n_tty.c */
 extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
+#ifdef CONFIG_TTY
 extern void __init n_tty_init(void);
+#else
+static inline void n_tty_init(void) { }
+#endif
 
 /* tty_audit.c */
 #ifdef CONFIG_AUDIT
diff --git a/init/main.c b/init/main.c
index f9c9d99482..b9bd0edf21 100644
--- a/init/main.c
+++ b/init/main.c
@@ -27,7 +27,7 @@
 #include <linux/initrd.h>
 #include <linux/bootmem.h>
 #include <linux/acpi.h>
-#include <linux/tty.h>
+#include <linux/console.h>
 #include <linux/nmi.h>
 #include <linux/percpu.h>
 #include <linux/kmod.h>
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 2984fb0f02..3a09406526 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -2611,6 +2611,30 @@ int unregister_console(struct console *console)
 EXPORT_SYMBOL(unregister_console);
 
 /*
+ * Initialize the console device. This is called *early*, so
+ * we can't necessarily depend on lots of kernel help here.
+ * Just do some early initializations, and do the complex setup
+ * later.
+ */
+void __init console_init(void)
+{
+	initcall_t *call;
+
+	/* Setup the default TTY line discipline. */
+	n_tty_init();
+
+	/*
+	 * set up the console device so that later boot sequences can
+	 * inform about problems etc..
+	 */
+	call = __con_initcall_start;
+	while (call < __con_initcall_end) {
+		(*call)();
+		call++;
+	}
+}
+
+/*
  * Some boot consoles access data that is in the init section and which will
  * be discarded after the initcalls have been run. To make sure that no code
  * will access this data, unregister the boot consoles in a late initcall.
-- 
2.9.3

Re: [PATCH 1/4] console: move console_init() out of tty_io.c

[Andy Shevchenko]

+Cc: Petr

On Thu, Apr 13, 2017 at 1:37 AM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote:
> All the console driver handling code lives in printk.c.
> Move console_init() there as well so console support can still be used
> when the TTY code is configured out. No logical changes from this patch.
>

So, I missed cover letter.
The question is what is this all for and why it's not applied yet?

> Signed-off-by: Nicolas Pitre <nico@linaro.org>
> ---
>  drivers/tty/tty_io.c    | 24 ------------------------
>  include/linux/console.h |  2 ++
>  include/linux/tty.h     |  7 ++++---
>  init/main.c             |  2 +-
>  kernel/printk/printk.c  | 24 ++++++++++++++++++++++++
>  5 files changed, 31 insertions(+), 28 deletions(-)
>
> diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
> index e6d1a65108..2100295861 100644
> --- a/drivers/tty/tty_io.c
> +++ b/drivers/tty/tty_io.c
> @@ -3578,30 +3578,6 @@ void tty_default_fops(struct file_operations *fops)
>         *fops = tty_fops;
>  }
>
> -/*
> - * Initialize the console device. This is called *early*, so
> - * we can't necessarily depend on lots of kernel help here.
> - * Just do some early initializations, and do the complex setup
> - * later.
> - */
> -void __init console_init(void)
> -{
> -       initcall_t *call;
> -
> -       /* Setup the default TTY line discipline. */
> -       n_tty_init();
> -
> -       /*
> -        * set up the console device so that later boot sequences can
> -        * inform about problems etc..
> -        */
> -       call = __con_initcall_start;
> -       while (call < __con_initcall_end) {
> -               (*call)();
> -               call++;
> -       }
> -}
> -
>  static char *tty_devnode(struct device *dev, umode_t *mode)
>  {
>         if (!mode)
> diff --git a/include/linux/console.h b/include/linux/console.h
> index 5949d18555..b8920a031a 100644
> --- a/include/linux/console.h
> +++ b/include/linux/console.h
> @@ -212,4 +212,6 @@ extern bool vgacon_text_force(void);
>  static inline bool vgacon_text_force(void) { return false; }
>  #endif
>
> +extern void console_init(void);
> +
>  #endif /* _LINUX_CONSOLE_H */
> diff --git a/include/linux/tty.h b/include/linux/tty.h
> index 1017e904c0..f1106d7c73 100644
> --- a/include/linux/tty.h
> +++ b/include/linux/tty.h
> @@ -390,7 +390,6 @@ static inline bool tty_throttled(struct tty_struct *tty)
>  }
>
>  #ifdef CONFIG_TTY
> -extern void console_init(void);
>  extern void tty_kref_put(struct tty_struct *tty);
>  extern struct pid *tty_get_pgrp(struct tty_struct *tty);
>  extern void tty_vhangup_self(void);
> @@ -402,8 +401,6 @@ extern struct tty_struct *get_current_tty(void);
>  extern int __init tty_init(void);
>  extern const char *tty_name(const struct tty_struct *tty);
>  #else
> -static inline void console_init(void)
> -{ }
>  static inline void tty_kref_put(struct tty_struct *tty)
>  { }
>  static inline struct pid *tty_get_pgrp(struct tty_struct *tty)
> @@ -669,7 +666,11 @@ extern int tty_ldisc_receive_buf(struct tty_ldisc *ld, const unsigned char *p,
>
>  /* n_tty.c */
>  extern void n_tty_inherit_ops(struct tty_ldisc_ops *ops);
> +#ifdef CONFIG_TTY
>  extern void __init n_tty_init(void);
> +#else
> +static inline void n_tty_init(void) { }
> +#endif
>
>  /* tty_audit.c */
>  #ifdef CONFIG_AUDIT
> diff --git a/init/main.c b/init/main.c
> index f9c9d99482..b9bd0edf21 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -27,7 +27,7 @@
>  #include <linux/initrd.h>
>  #include <linux/bootmem.h>
>  #include <linux/acpi.h>
> -#include <linux/tty.h>
> +#include <linux/console.h>
>  #include <linux/nmi.h>
>  #include <linux/percpu.h>
>  #include <linux/kmod.h>
> diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
> index 2984fb0f02..3a09406526 100644
> --- a/kernel/printk/printk.c
> +++ b/kernel/printk/printk.c
> @@ -2611,6 +2611,30 @@ int unregister_console(struct console *console)
>  EXPORT_SYMBOL(unregister_console);
>
>  /*
> + * Initialize the console device. This is called *early*, so
> + * we can't necessarily depend on lots of kernel help here.
> + * Just do some early initializations, and do the complex setup
> + * later.
> + */
> +void __init console_init(void)
> +{
> +       initcall_t *call;
> +
> +       /* Setup the default TTY line discipline. */
> +       n_tty_init();
> +
> +       /*
> +        * set up the console device so that later boot sequences can
> +        * inform about problems etc..
> +        */
> +       call = __con_initcall_start;
> +       while (call < __con_initcall_end) {
> +               (*call)();
> +               call++;
> +       }
> +}
> +
> +/*
>   * Some boot consoles access data that is in the init section and which will
>   * be discarded after the initcalls have been run. To make sure that no code
>   * will access this data, unregister the boot consoles in a late initcall.
> --
> 2.9.3
>



-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 1/4] console: move console_init() out of tty_io.c

[Greg Kroah-Hartman]

On Wed, May 03, 2017 at 09:13:51PM +0300, Andy Shevchenko wrote:
> +Cc: Petr
> 
> On Thu, Apr 13, 2017 at 1:37 AM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote:
> > All the console driver handling code lives in printk.c.
> > Move console_init() there as well so console support can still be used
> > when the TTY code is configured out. No logical changes from this patch.
> >
> 
> So, I missed cover letter.
> The question is what is this all for and why it's not applied yet?

It's in my tty tree to go to Linus for 4.12-rc1, why do you think it is
not applied?

thanks,

greg k-h

Re: [PATCH 1/4] console: move console_init() out of tty_io.c

[Andy Shevchenko]

On Wed, May 3, 2017 at 10:06 PM, Greg Kroah-Hartman
<gregkh@linuxfoundation.org> wrote:
> On Wed, May 03, 2017 at 09:13:51PM +0300, Andy Shevchenko wrote:
>> +Cc: Petr
>>
>> On Thu, Apr 13, 2017 at 1:37 AM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote:
>> > All the console driver handling code lives in printk.c.
>> > Move console_init() there as well so console support can still be used
>> > when the TTY code is configured out. No logical changes from this patch.
>> >
>>
>> So, I missed cover letter.
>> The question is what is this all for and why it's not applied yet?
>
> It's in my tty tree to go to Linus for 4.12-rc1,

Ah, good.

> why do you think it is
> not applied?

I have a tree based on top of most recent linux-next with
(potentially) conflicting patches. Besides that I just grepped the
code and found no changes in today's linux-next.

-- 
With Best Regards,
Andy Shevchenko

Re: [PATCH 1/4] console: move console_init() out of tty_io.c

[Greg Kroah-Hartman]

On Wed, May 03, 2017 at 10:16:00PM +0300, Andy Shevchenko wrote:
> On Wed, May 3, 2017 at 10:06 PM, Greg Kroah-Hartman
> <gregkh@linuxfoundation.org> wrote:
> > On Wed, May 03, 2017 at 09:13:51PM +0300, Andy Shevchenko wrote:
> >> +Cc: Petr
> >>
> >> On Thu, Apr 13, 2017 at 1:37 AM, Nicolas Pitre <nicolas.pitre@linaro.org> wrote:
> >> > All the console driver handling code lives in printk.c.
> >> > Move console_init() there as well so console support can still be used
> >> > when the TTY code is configured out. No logical changes from this patch.
> >> >
> >>
> >> So, I missed cover letter.
> >> The question is what is this all for and why it's not applied yet?
> >
> > It's in my tty tree to go to Linus for 4.12-rc1,
> 
> Ah, good.
> 
> > why do you think it is
> > not applied?
> 
> I have a tree based on top of most recent linux-next with
> (potentially) conflicting patches. Besides that I just grepped the
> code and found no changes in today's linux-next.

Ah crap!  I never pushed that tree out to the world, it was stuck on my
laptop...  Ugh, doing that now...

greg k-h

[PATCH 2/4] tty: move baudrate handling code to a file of its own

[Nicolas Pitre]

To allow reuse without the rest of the tty_ioctl code.
No logical changes from this patch.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
 drivers/tty/Makefile       |   3 +-
 drivers/tty/tty_baudrate.c | 232 +++++++++++++++++++++++++++++++++++++++++++++
 drivers/tty/tty_ioctl.c    | 222 -------------------------------------------
 3 files changed, 234 insertions(+), 223 deletions(-)
 create mode 100644 drivers/tty/tty_baudrate.c

diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile
index b95bed92da..6983b5a49e 100644
--- a/drivers/tty/Makefile
+++ b/drivers/tty/Makefile
@@ -1,5 +1,6 @@
 obj-$(CONFIG_TTY)		+= tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
-				   tty_buffer.o tty_port.o tty_mutex.o tty_ldsem.o
+				   tty_buffer.o tty_port.o tty_mutex.o \
+				   tty_ldsem.o tty_baudrate.o
 obj-$(CONFIG_LEGACY_PTYS)	+= pty.o
 obj-$(CONFIG_UNIX98_PTYS)	+= pty.o
 obj-$(CONFIG_AUDIT)		+= tty_audit.o
diff --git a/drivers/tty/tty_baudrate.c b/drivers/tty/tty_baudrate.c
new file mode 100644
index 0000000000..5c33fd2567
--- /dev/null
+++ b/drivers/tty/tty_baudrate.c
@@ -0,0 +1,232 @@
+/*
+ *  Copyright (C) 1991, 1992, 1993, 1994  Linus Torvalds
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/termios.h>
+#include <linux/tty.h>
+#include <linux/export.h>
+
+
+/*
+ * Routine which returns the baud rate of the tty
+ *
+ * Note that the baud_table needs to be kept in sync with the
+ * include/asm/termbits.h file.
+ */
+static const speed_t baud_table[] = {
+	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
+	9600, 19200, 38400, 57600, 115200, 230400, 460800,
+#ifdef __sparc__
+	76800, 153600, 307200, 614400, 921600
+#else
+	500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
+	2500000, 3000000, 3500000, 4000000
+#endif
+};
+
+#ifndef __sparc__
+static const tcflag_t baud_bits[] = {
+	B0, B50, B75, B110, B134, B150, B200, B300, B600,
+	B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+	B57600, B115200, B230400, B460800, B500000, B576000,
+	B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
+	B3000000, B3500000, B4000000
+};
+#else
+static const tcflag_t baud_bits[] = {
+	B0, B50, B75, B110, B134, B150, B200, B300, B600,
+	B1200, B1800, B2400, B4800, B9600, B19200, B38400,
+	B57600, B115200, B230400, B460800, B76800, B153600,
+	B307200, B614400, B921600
+};
+#endif
+
+static int n_baud_table = ARRAY_SIZE(baud_table);
+
+/**
+ *	tty_termios_baud_rate
+ *	@termios: termios structure
+ *
+ *	Convert termios baud rate data into a speed. This should be called
+ *	with the termios lock held if this termios is a terminal termios
+ *	structure. May change the termios data. Device drivers can call this
+ *	function but should use ->c_[io]speed directly as they are updated.
+ *
+ *	Locking: none
+ */
+
+speed_t tty_termios_baud_rate(struct ktermios *termios)
+{
+	unsigned int cbaud;
+
+	cbaud = termios->c_cflag & CBAUD;
+
+#ifdef BOTHER
+	/* Magic token for arbitrary speed via c_ispeed/c_ospeed */
+	if (cbaud == BOTHER)
+		return termios->c_ospeed;
+#endif
+	if (cbaud & CBAUDEX) {
+		cbaud &= ~CBAUDEX;
+
+		if (cbaud < 1 || cbaud + 15 > n_baud_table)
+			termios->c_cflag &= ~CBAUDEX;
+		else
+			cbaud += 15;
+	}
+	return baud_table[cbaud];
+}
+EXPORT_SYMBOL(tty_termios_baud_rate);
+
+/**
+ *	tty_termios_input_baud_rate
+ *	@termios: termios structure
+ *
+ *	Convert termios baud rate data into a speed. This should be called
+ *	with the termios lock held if this termios is a terminal termios
+ *	structure. May change the termios data. Device drivers can call this
+ *	function but should use ->c_[io]speed directly as they are updated.
+ *
+ *	Locking: none
+ */
+
+speed_t tty_termios_input_baud_rate(struct ktermios *termios)
+{
+#ifdef IBSHIFT
+	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
+
+	if (cbaud == B0)
+		return tty_termios_baud_rate(termios);
+
+	/* Magic token for arbitrary speed via c_ispeed*/
+	if (cbaud == BOTHER)
+		return termios->c_ispeed;
+
+	if (cbaud & CBAUDEX) {
+		cbaud &= ~CBAUDEX;
+
+		if (cbaud < 1 || cbaud + 15 > n_baud_table)
+			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
+		else
+			cbaud += 15;
+	}
+	return baud_table[cbaud];
+#else
+	return tty_termios_baud_rate(termios);
+#endif
+}
+EXPORT_SYMBOL(tty_termios_input_baud_rate);
+
+/**
+ *	tty_termios_encode_baud_rate
+ *	@termios: ktermios structure holding user requested state
+ *	@ispeed: input speed
+ *	@ospeed: output speed
+ *
+ *	Encode the speeds set into the passed termios structure. This is
+ *	used as a library helper for drivers so that they can report back
+ *	the actual speed selected when it differs from the speed requested
+ *
+ *	For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
+ *	we need to carefully set the bits when the user does not get the
+ *	desired speed. We allow small margins and preserve as much of possible
+ *	of the input intent to keep compatibility.
+ *
+ *	Locking: Caller should hold termios lock. This is already held
+ *	when calling this function from the driver termios handler.
+ *
+ *	The ifdefs deal with platforms whose owners have yet to update them
+ *	and will all go away once this is done.
+ */
+
+void tty_termios_encode_baud_rate(struct ktermios *termios,
+				  speed_t ibaud, speed_t obaud)
+{
+	int i = 0;
+	int ifound = -1, ofound = -1;
+	int iclose = ibaud/50, oclose = obaud/50;
+	int ibinput = 0;
+
+	if (obaud == 0)			/* CD dropped 		  */
+		ibaud = 0;		/* Clear ibaud to be sure */
+
+	termios->c_ispeed = ibaud;
+	termios->c_ospeed = obaud;
+
+#ifdef BOTHER
+	/* If the user asked for a precise weird speed give a precise weird
+	   answer. If they asked for a Bfoo speed they may have problems
+	   digesting non-exact replies so fuzz a bit */
+
+	if ((termios->c_cflag & CBAUD) == BOTHER)
+		oclose = 0;
+	if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
+		iclose = 0;
+	if ((termios->c_cflag >> IBSHIFT) & CBAUD)
+		ibinput = 1;	/* An input speed was specified */
+#endif
+	termios->c_cflag &= ~CBAUD;
+
+	/*
+	 *	Our goal is to find a close match to the standard baud rate
+	 *	returned. Walk the baud rate table and if we get a very close
+	 *	match then report back the speed as a POSIX Bxxxx value by
+	 *	preference
+	 */
+
+	do {
+		if (obaud - oclose <= baud_table[i] &&
+		    obaud + oclose >= baud_table[i]) {
+			termios->c_cflag |= baud_bits[i];
+			ofound = i;
+		}
+		if (ibaud - iclose <= baud_table[i] &&
+		    ibaud + iclose >= baud_table[i]) {
+			/* For the case input == output don't set IBAUD bits
+			   if the user didn't do so */
+			if (ofound == i && !ibinput)
+				ifound  = i;
+#ifdef IBSHIFT
+			else {
+				ifound = i;
+				termios->c_cflag |= (baud_bits[i] << IBSHIFT);
+			}
+#endif
+		}
+	} while (++i < n_baud_table);
+
+	/*
+	 *	If we found no match then use BOTHER if provided or warn
+	 *	the user their platform maintainer needs to wake up if not.
+	 */
+#ifdef BOTHER
+	if (ofound == -1)
+		termios->c_cflag |= BOTHER;
+	/* Set exact input bits only if the input and output differ or the
+	   user already did */
+	if (ifound == -1 && (ibaud != obaud || ibinput))
+		termios->c_cflag |= (BOTHER << IBSHIFT);
+#else
+	if (ifound == -1 || ofound == -1)
+		pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n");
+#endif
+}
+EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
+
+/**
+ *	tty_encode_baud_rate		-	set baud rate of the tty
+ *	@ibaud: input baud rate
+ *	@obad: output baud rate
+ *
+ *	Update the current termios data for the tty with the new speed
+ *	settings. The caller must hold the termios_rwsem for the tty in
+ *	question.
+ */
+
+void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
+{
+	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);
+}
+EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
diff --git a/drivers/tty/tty_ioctl.c b/drivers/tty/tty_ioctl.c
index a9a978731c..efa96e6c4c 100644
--- a/drivers/tty/tty_ioctl.c
+++ b/drivers/tty/tty_ioctl.c
@@ -258,228 +258,6 @@ static void unset_locked_termios(struct tty_struct *tty, struct ktermios *old)
 	/* FIXME: What should we do for i/ospeed */
 }
 
-/*
- * Routine which returns the baud rate of the tty
- *
- * Note that the baud_table needs to be kept in sync with the
- * include/asm/termbits.h file.
- */
-static const speed_t baud_table[] = {
-	0, 50, 75, 110, 134, 150, 200, 300, 600, 1200, 1800, 2400, 4800,
-	9600, 19200, 38400, 57600, 115200, 230400, 460800,
-#ifdef __sparc__
-	76800, 153600, 307200, 614400, 921600
-#else
-	500000, 576000, 921600, 1000000, 1152000, 1500000, 2000000,
-	2500000, 3000000, 3500000, 4000000
-#endif
-};
-
-#ifndef __sparc__
-static const tcflag_t baud_bits[] = {
-	B0, B50, B75, B110, B134, B150, B200, B300, B600,
-	B1200, B1800, B2400, B4800, B9600, B19200, B38400,
-	B57600, B115200, B230400, B460800, B500000, B576000,
-	B921600, B1000000, B1152000, B1500000, B2000000, B2500000,
-	B3000000, B3500000, B4000000
-};
-#else
-static const tcflag_t baud_bits[] = {
-	B0, B50, B75, B110, B134, B150, B200, B300, B600,
-	B1200, B1800, B2400, B4800, B9600, B19200, B38400,
-	B57600, B115200, B230400, B460800, B76800, B153600,
-	B307200, B614400, B921600
-};
-#endif
-
-static int n_baud_table = ARRAY_SIZE(baud_table);
-
-/**
- *	tty_termios_baud_rate
- *	@termios: termios structure
- *
- *	Convert termios baud rate data into a speed. This should be called
- *	with the termios lock held if this termios is a terminal termios
- *	structure. May change the termios data. Device drivers can call this
- *	function but should use ->c_[io]speed directly as they are updated.
- *
- *	Locking: none
- */
-
-speed_t tty_termios_baud_rate(struct ktermios *termios)
-{
-	unsigned int cbaud;
-
-	cbaud = termios->c_cflag & CBAUD;
-
-#ifdef BOTHER
-	/* Magic token for arbitrary speed via c_ispeed/c_ospeed */
-	if (cbaud == BOTHER)
-		return termios->c_ospeed;
-#endif
-	if (cbaud & CBAUDEX) {
-		cbaud &= ~CBAUDEX;
-
-		if (cbaud < 1 || cbaud + 15 > n_baud_table)
-			termios->c_cflag &= ~CBAUDEX;
-		else
-			cbaud += 15;
-	}
-	return baud_table[cbaud];
-}
-EXPORT_SYMBOL(tty_termios_baud_rate);
-
-/**
- *	tty_termios_input_baud_rate
- *	@termios: termios structure
- *
- *	Convert termios baud rate data into a speed. This should be called
- *	with the termios lock held if this termios is a terminal termios
- *	structure. May change the termios data. Device drivers can call this
- *	function but should use ->c_[io]speed directly as they are updated.
- *
- *	Locking: none
- */
-
-speed_t tty_termios_input_baud_rate(struct ktermios *termios)
-{
-#ifdef IBSHIFT
-	unsigned int cbaud = (termios->c_cflag >> IBSHIFT) & CBAUD;
-
-	if (cbaud == B0)
-		return tty_termios_baud_rate(termios);
-
-	/* Magic token for arbitrary speed via c_ispeed*/
-	if (cbaud == BOTHER)
-		return termios->c_ispeed;
-
-	if (cbaud & CBAUDEX) {
-		cbaud &= ~CBAUDEX;
-
-		if (cbaud < 1 || cbaud + 15 > n_baud_table)
-			termios->c_cflag &= ~(CBAUDEX << IBSHIFT);
-		else
-			cbaud += 15;
-	}
-	return baud_table[cbaud];
-#else
-	return tty_termios_baud_rate(termios);
-#endif
-}
-EXPORT_SYMBOL(tty_termios_input_baud_rate);
-
-/**
- *	tty_termios_encode_baud_rate
- *	@termios: ktermios structure holding user requested state
- *	@ispeed: input speed
- *	@ospeed: output speed
- *
- *	Encode the speeds set into the passed termios structure. This is
- *	used as a library helper for drivers so that they can report back
- *	the actual speed selected when it differs from the speed requested
- *
- *	For maximal back compatibility with legacy SYS5/POSIX *nix behaviour
- *	we need to carefully set the bits when the user does not get the
- *	desired speed. We allow small margins and preserve as much of possible
- *	of the input intent to keep compatibility.
- *
- *	Locking: Caller should hold termios lock. This is already held
- *	when calling this function from the driver termios handler.
- *
- *	The ifdefs deal with platforms whose owners have yet to update them
- *	and will all go away once this is done.
- */
-
-void tty_termios_encode_baud_rate(struct ktermios *termios,
-				  speed_t ibaud, speed_t obaud)
-{
-	int i = 0;
-	int ifound = -1, ofound = -1;
-	int iclose = ibaud/50, oclose = obaud/50;
-	int ibinput = 0;
-
-	if (obaud == 0)			/* CD dropped 		  */
-		ibaud = 0;		/* Clear ibaud to be sure */
-
-	termios->c_ispeed = ibaud;
-	termios->c_ospeed = obaud;
-
-#ifdef BOTHER
-	/* If the user asked for a precise weird speed give a precise weird
-	   answer. If they asked for a Bfoo speed they may have problems
-	   digesting non-exact replies so fuzz a bit */
-
-	if ((termios->c_cflag & CBAUD) == BOTHER)
-		oclose = 0;
-	if (((termios->c_cflag >> IBSHIFT) & CBAUD) == BOTHER)
-		iclose = 0;
-	if ((termios->c_cflag >> IBSHIFT) & CBAUD)
-		ibinput = 1;	/* An input speed was specified */
-#endif
-	termios->c_cflag &= ~CBAUD;
-
-	/*
-	 *	Our goal is to find a close match to the standard baud rate
-	 *	returned. Walk the baud rate table and if we get a very close
-	 *	match then report back the speed as a POSIX Bxxxx value by
-	 *	preference
-	 */
-
-	do {
-		if (obaud - oclose <= baud_table[i] &&
-		    obaud + oclose >= baud_table[i]) {
-			termios->c_cflag |= baud_bits[i];
-			ofound = i;
-		}
-		if (ibaud - iclose <= baud_table[i] &&
-		    ibaud + iclose >= baud_table[i]) {
-			/* For the case input == output don't set IBAUD bits
-			   if the user didn't do so */
-			if (ofound == i && !ibinput)
-				ifound  = i;
-#ifdef IBSHIFT
-			else {
-				ifound = i;
-				termios->c_cflag |= (baud_bits[i] << IBSHIFT);
-			}
-#endif
-		}
-	} while (++i < n_baud_table);
-
-	/*
-	 *	If we found no match then use BOTHER if provided or warn
-	 *	the user their platform maintainer needs to wake up if not.
-	 */
-#ifdef BOTHER
-	if (ofound == -1)
-		termios->c_cflag |= BOTHER;
-	/* Set exact input bits only if the input and output differ or the
-	   user already did */
-	if (ifound == -1 && (ibaud != obaud || ibinput))
-		termios->c_cflag |= (BOTHER << IBSHIFT);
-#else
-	if (ifound == -1 || ofound == -1)
-		pr_warn_once("tty: Unable to return correct speed data as your architecture needs updating.\n");
-#endif
-}
-EXPORT_SYMBOL_GPL(tty_termios_encode_baud_rate);
-
-/**
- *	tty_encode_baud_rate		-	set baud rate of the tty
- *	@ibaud: input baud rate
- *	@obad: output baud rate
- *
- *	Update the current termios data for the tty with the new speed
- *	settings. The caller must hold the termios_rwsem for the tty in
- *	question.
- */
-
-void tty_encode_baud_rate(struct tty_struct *tty, speed_t ibaud, speed_t obaud)
-{
-	tty_termios_encode_baud_rate(&tty->termios, ibaud, obaud);
-}
-EXPORT_SYMBOL_GPL(tty_encode_baud_rate);
-
 /**
  *	tty_termios_copy_hw	-	copy hardware settings
  *	@new: New termios
-- 
2.9.3

[PATCH 3/4] tty: split job control support into a file of its own

[Nicolas Pitre]

This makes it easier for job control to become optional and/or usable
independently from tty_io.c, as well as providing a nice purpose
separation. No logical changes from this patch.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
 drivers/tty/Makefile      |   2 +-
 drivers/tty/tty_io.c      | 547 +--------------------------------------------
 drivers/tty/tty_jobctrl.c | 554 ++++++++++++++++++++++++++++++++++++++++++++++
 include/linux/tty.h       |   6 +
 4 files changed, 572 insertions(+), 537 deletions(-)
 create mode 100644 drivers/tty/tty_jobctrl.c

diff --git a/drivers/tty/Makefile b/drivers/tty/Makefile
index 6983b5a49e..f02becdb3e 100644
--- a/drivers/tty/Makefile
+++ b/drivers/tty/Makefile
@@ -1,6 +1,6 @@
 obj-$(CONFIG_TTY)		+= tty_io.o n_tty.o tty_ioctl.o tty_ldisc.o \
 				   tty_buffer.o tty_port.o tty_mutex.o \
-				   tty_ldsem.o tty_baudrate.o
+				   tty_ldsem.o tty_baudrate.o tty_jobctrl.o
 obj-$(CONFIG_LEGACY_PTYS)	+= pty.o
 obj-$(CONFIG_UNIX98_PTYS)	+= pty.o
 obj-$(CONFIG_AUDIT)		+= tty_audit.o
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 2100295861..e5013f8fdb 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -377,65 +377,6 @@ struct tty_driver *tty_find_polling_driver(char *name, int *line)
 EXPORT_SYMBOL_GPL(tty_find_polling_driver);
 #endif
 
-static int is_ignored(int sig)
-{
-	return (sigismember(&current->blocked, sig) ||
-		current->sighand->action[sig-1].sa.sa_handler == SIG_IGN);
-}
-
-/**
- *	tty_check_change	-	check for POSIX terminal changes
- *	@tty: tty to check
- *
- *	If we try to write to, or set the state of, a terminal and we're
- *	not in the foreground, send a SIGTTOU.  If the signal is blocked or
- *	ignored, go ahead and perform the operation.  (POSIX 7.2)
- *
- *	Locking: ctrl_lock
- */
-
-int __tty_check_change(struct tty_struct *tty, int sig)
-{
-	unsigned long flags;
-	struct pid *pgrp, *tty_pgrp;
-	int ret = 0;
-
-	if (current->signal->tty != tty)
-		return 0;
-
-	rcu_read_lock();
-	pgrp = task_pgrp(current);
-
-	spin_lock_irqsave(&tty->ctrl_lock, flags);
-	tty_pgrp = tty->pgrp;
-	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
-
-	if (tty_pgrp && pgrp != tty->pgrp) {
-		if (is_ignored(sig)) {
-			if (sig == SIGTTIN)
-				ret = -EIO;
-		} else if (is_current_pgrp_orphaned())
-			ret = -EIO;
-		else {
-			kill_pgrp(pgrp, sig, 1);
-			set_thread_flag(TIF_SIGPENDING);
-			ret = -ERESTARTSYS;
-		}
-	}
-	rcu_read_unlock();
-
-	if (!tty_pgrp)
-		tty_warn(tty, "sig=%d, tty->pgrp == NULL!\n", sig);
-
-	return ret;
-}
-
-int tty_check_change(struct tty_struct *tty)
-{
-	return __tty_check_change(tty, SIGTTOU);
-}
-EXPORT_SYMBOL(tty_check_change);
-
 static ssize_t hung_up_tty_read(struct file *file, char __user *buf,
 				size_t count, loff_t *ppos)
 {
@@ -509,79 +450,6 @@ static const struct file_operations hung_up_tty_fops = {
 static DEFINE_SPINLOCK(redirect_lock);
 static struct file *redirect;
 
-
-void proc_clear_tty(struct task_struct *p)
-{
-	unsigned long flags;
-	struct tty_struct *tty;
-	spin_lock_irqsave(&p->sighand->siglock, flags);
-	tty = p->signal->tty;
-	p->signal->tty = NULL;
-	spin_unlock_irqrestore(&p->sighand->siglock, flags);
-	tty_kref_put(tty);
-}
-
-/**
- * proc_set_tty -  set the controlling terminal
- *
- * Only callable by the session leader and only if it does not already have
- * a controlling terminal.
- *
- * Caller must hold:  tty_lock()
- *		      a readlock on tasklist_lock
- *		      sighand lock
- */
-static void __proc_set_tty(struct tty_struct *tty)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&tty->ctrl_lock, flags);
-	/*
-	 * The session and fg pgrp references will be non-NULL if
-	 * tiocsctty() is stealing the controlling tty
-	 */
-	put_pid(tty->session);
-	put_pid(tty->pgrp);
-	tty->pgrp = get_pid(task_pgrp(current));
-	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
-	tty->session = get_pid(task_session(current));
-	if (current->signal->tty) {
-		tty_debug(tty, "current tty %s not NULL!!\n",
-			  current->signal->tty->name);
-		tty_kref_put(current->signal->tty);
-	}
-	put_pid(current->signal->tty_old_pgrp);
-	current->signal->tty = tty_kref_get(tty);
-	current->signal->tty_old_pgrp = NULL;
-}
-
-static void proc_set_tty(struct tty_struct *tty)
-{
-	spin_lock_irq(&current->sighand->siglock);
-	__proc_set_tty(tty);
-	spin_unlock_irq(&current->sighand->siglock);
-}
-
-struct tty_struct *get_current_tty(void)
-{
-	struct tty_struct *tty;
-	unsigned long flags;
-
-	spin_lock_irqsave(&current->sighand->siglock, flags);
-	tty = tty_kref_get(current->signal->tty);
-	spin_unlock_irqrestore(&current->sighand->siglock, flags);
-	return tty;
-}
-EXPORT_SYMBOL_GPL(get_current_tty);
-
-static void session_clear_tty(struct pid *session)
-{
-	struct task_struct *p;
-	do_each_pid_task(session, PIDTYPE_SID, p) {
-		proc_clear_tty(p);
-	} while_each_pid_task(session, PIDTYPE_SID, p);
-}
-
 /**
  *	tty_wakeup	-	request more data
  *	@tty: terminal
@@ -609,60 +477,6 @@ void tty_wakeup(struct tty_struct *tty)
 EXPORT_SYMBOL_GPL(tty_wakeup);
 
 /**
- *	tty_signal_session_leader	- sends SIGHUP to session leader
- *	@tty		controlling tty
- *	@exit_session	if non-zero, signal all foreground group processes
- *
- *	Send SIGHUP and SIGCONT to the session leader and its process group.
- *	Optionally, signal all processes in the foreground process group.
- *
- *	Returns the number of processes in the session with this tty
- *	as their controlling terminal. This value is used to drop
- *	tty references for those processes.
- */
-static int tty_signal_session_leader(struct tty_struct *tty, int exit_session)
-{
-	struct task_struct *p;
-	int refs = 0;
-	struct pid *tty_pgrp = NULL;
-
-	read_lock(&tasklist_lock);
-	if (tty->session) {
-		do_each_pid_task(tty->session, PIDTYPE_SID, p) {
-			spin_lock_irq(&p->sighand->siglock);
-			if (p->signal->tty == tty) {
-				p->signal->tty = NULL;
-				/* We defer the dereferences outside fo
-				   the tasklist lock */
-				refs++;
-			}
-			if (!p->signal->leader) {
-				spin_unlock_irq(&p->sighand->siglock);
-				continue;
-			}
-			__group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p);
-			__group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p);
-			put_pid(p->signal->tty_old_pgrp);  /* A noop */
-			spin_lock(&tty->ctrl_lock);
-			tty_pgrp = get_pid(tty->pgrp);
-			if (tty->pgrp)
-				p->signal->tty_old_pgrp = get_pid(tty->pgrp);
-			spin_unlock(&tty->ctrl_lock);
-			spin_unlock_irq(&p->sighand->siglock);
-		} while_each_pid_task(tty->session, PIDTYPE_SID, p);
-	}
-	read_unlock(&tasklist_lock);
-
-	if (tty_pgrp) {
-		if (exit_session)
-			kill_pgrp(tty_pgrp, SIGHUP, exit_session);
-		put_pid(tty_pgrp);
-	}
-
-	return refs;
-}
-
-/**
  *	__tty_hangup		-	actual handler for hangup events
  *	@work: tty device
  *
@@ -840,7 +654,7 @@ void tty_vhangup_self(void)
  *	is complete. That guarantee is necessary for security reasons.
  */
 
-static void tty_vhangup_session(struct tty_struct *tty)
+void tty_vhangup_session(struct tty_struct *tty)
 {
 	tty_debug_hangup(tty, "session hangup\n");
 	__tty_hangup(tty, 1);
@@ -862,106 +676,6 @@ int tty_hung_up_p(struct file *filp)
 EXPORT_SYMBOL(tty_hung_up_p);
 
 /**
- *	disassociate_ctty	-	disconnect controlling tty
- *	@on_exit: true if exiting so need to "hang up" the session
- *
- *	This function is typically called only by the session leader, when
- *	it wants to disassociate itself from its controlling tty.
- *
- *	It performs the following functions:
- * 	(1)  Sends a SIGHUP and SIGCONT to the foreground process group
- * 	(2)  Clears the tty from being controlling the session
- * 	(3)  Clears the controlling tty for all processes in the
- * 		session group.
- *
- *	The argument on_exit is set to 1 if called when a process is
- *	exiting; it is 0 if called by the ioctl TIOCNOTTY.
- *
- *	Locking:
- *		BTM is taken for hysterical raisins, and held when
- *		  called from no_tty().
- *		  tty_mutex is taken to protect tty
- *		  ->siglock is taken to protect ->signal/->sighand
- *		  tasklist_lock is taken to walk process list for sessions
- *		    ->siglock is taken to protect ->signal/->sighand
- */
-
-void disassociate_ctty(int on_exit)
-{
-	struct tty_struct *tty;
-
-	if (!current->signal->leader)
-		return;
-
-	tty = get_current_tty();
-	if (tty) {
-		if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY) {
-			tty_vhangup_session(tty);
-		} else {
-			struct pid *tty_pgrp = tty_get_pgrp(tty);
-			if (tty_pgrp) {
-				kill_pgrp(tty_pgrp, SIGHUP, on_exit);
-				if (!on_exit)
-					kill_pgrp(tty_pgrp, SIGCONT, on_exit);
-				put_pid(tty_pgrp);
-			}
-		}
-		tty_kref_put(tty);
-
-	} else if (on_exit) {
-		struct pid *old_pgrp;
-		spin_lock_irq(&current->sighand->siglock);
-		old_pgrp = current->signal->tty_old_pgrp;
-		current->signal->tty_old_pgrp = NULL;
-		spin_unlock_irq(&current->sighand->siglock);
-		if (old_pgrp) {
-			kill_pgrp(old_pgrp, SIGHUP, on_exit);
-			kill_pgrp(old_pgrp, SIGCONT, on_exit);
-			put_pid(old_pgrp);
-		}
-		return;
-	}
-
-	spin_lock_irq(&current->sighand->siglock);
-	put_pid(current->signal->tty_old_pgrp);
-	current->signal->tty_old_pgrp = NULL;
-
-	tty = tty_kref_get(current->signal->tty);
-	if (tty) {
-		unsigned long flags;
-		spin_lock_irqsave(&tty->ctrl_lock, flags);
-		put_pid(tty->session);
-		put_pid(tty->pgrp);
-		tty->session = NULL;
-		tty->pgrp = NULL;
-		spin_unlock_irqrestore(&tty->ctrl_lock, flags);
-		tty_kref_put(tty);
-	} else
-		tty_debug_hangup(tty, "no current tty\n");
-
-	spin_unlock_irq(&current->sighand->siglock);
-	/* Now clear signal->tty under the lock */
-	read_lock(&tasklist_lock);
-	session_clear_tty(task_session(current));
-	read_unlock(&tasklist_lock);
-}
-
-/**
- *
- *	no_tty	- Ensure the current process does not have a controlling tty
- */
-void no_tty(void)
-{
-	/* FIXME: Review locking here. The tty_lock never covered any race
-	   between a new association and proc_clear_tty but possible we need
-	   to protect against this anyway */
-	struct task_struct *tsk = current;
-	disassociate_ctty(0);
-	proc_clear_tty(tsk);
-}
-
-
-/**
  *	stop_tty	-	propagate flow control
  *	@tty: tty to stop
  *
@@ -2163,38 +1877,13 @@ static int tty_open(struct inode *inode, struct file *filp)
 	}
 	clear_bit(TTY_HUPPED, &tty->flags);
 
-
-	read_lock(&tasklist_lock);
-	spin_lock_irq(&current->sighand->siglock);
 	noctty = (filp->f_flags & O_NOCTTY) ||
-			(IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) ||
-			device == MKDEV(TTYAUX_MAJOR, 1) ||
-			(tty->driver->type == TTY_DRIVER_TYPE_PTY &&
-			 tty->driver->subtype == PTY_TYPE_MASTER);
-
-	if (!noctty &&
-	    current->signal->leader &&
-	    !current->signal->tty &&
-	    tty->session == NULL) {
-		/*
-		 * Don't let a process that only has write access to the tty
-		 * obtain the privileges associated with having a tty as
-		 * controlling terminal (being able to reopen it with full
-		 * access through /dev/tty, being able to perform pushback).
-		 * Many distributions set the group of all ttys to "tty" and
-		 * grant write-only access to all terminals for setgid tty
-		 * binaries, which should not imply full privileges on all ttys.
-		 *
-		 * This could theoretically break old code that performs open()
-		 * on a write-only file descriptor. In that case, it might be
-		 * necessary to also permit this if
-		 * inode_permission(inode, MAY_READ) == 0.
-		 */
-		if (filp->f_mode & FMODE_READ)
-			__proc_set_tty(tty);
-	}
-	spin_unlock_irq(&current->sighand->siglock);
-	read_unlock(&tasklist_lock);
+		 (IS_ENABLED(CONFIG_VT) && device == MKDEV(TTY_MAJOR, 0)) ||
+		 device == MKDEV(TTYAUX_MAJOR, 1) ||
+		 (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
+		  tty->driver->subtype == PTY_TYPE_MASTER);
+	if (!noctty)
+		tty_open_proc_set_tty(filp, tty);
 	tty_unlock(tty);
 	return 0;
 }
@@ -2457,211 +2146,6 @@ static int fionbio(struct file *file, int __user *p)
 }
 
 /**
- *	tiocsctty	-	set controlling tty
- *	@tty: tty structure
- *	@arg: user argument
- *
- *	This ioctl is used to manage job control. It permits a session
- *	leader to set this tty as the controlling tty for the session.
- *
- *	Locking:
- *		Takes tty_lock() to serialize proc_set_tty() for this tty
- *		Takes tasklist_lock internally to walk sessions
- *		Takes ->siglock() when updating signal->tty
- */
-
-static int tiocsctty(struct tty_struct *tty, struct file *file, int arg)
-{
-	int ret = 0;
-
-	tty_lock(tty);
-	read_lock(&tasklist_lock);
-
-	if (current->signal->leader && (task_session(current) == tty->session))
-		goto unlock;
-
-	/*
-	 * The process must be a session leader and
-	 * not have a controlling tty already.
-	 */
-	if (!current->signal->leader || current->signal->tty) {
-		ret = -EPERM;
-		goto unlock;
-	}
-
-	if (tty->session) {
-		/*
-		 * This tty is already the controlling
-		 * tty for another session group!
-		 */
-		if (arg == 1 && capable(CAP_SYS_ADMIN)) {
-			/*
-			 * Steal it away
-			 */
-			session_clear_tty(tty->session);
-		} else {
-			ret = -EPERM;
-			goto unlock;
-		}
-	}
-
-	/* See the comment in tty_open(). */
-	if ((file->f_mode & FMODE_READ) == 0 && !capable(CAP_SYS_ADMIN)) {
-		ret = -EPERM;
-		goto unlock;
-	}
-
-	proc_set_tty(tty);
-unlock:
-	read_unlock(&tasklist_lock);
-	tty_unlock(tty);
-	return ret;
-}
-
-/**
- *	tty_get_pgrp	-	return a ref counted pgrp pid
- *	@tty: tty to read
- *
- *	Returns a refcounted instance of the pid struct for the process
- *	group controlling the tty.
- */
-
-struct pid *tty_get_pgrp(struct tty_struct *tty)
-{
-	unsigned long flags;
-	struct pid *pgrp;
-
-	spin_lock_irqsave(&tty->ctrl_lock, flags);
-	pgrp = get_pid(tty->pgrp);
-	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
-
-	return pgrp;
-}
-EXPORT_SYMBOL_GPL(tty_get_pgrp);
-
-/*
- * This checks not only the pgrp, but falls back on the pid if no
- * satisfactory pgrp is found. I dunno - gdb doesn't work correctly
- * without this...
- *
- * The caller must hold rcu lock or the tasklist lock.
- */
-static struct pid *session_of_pgrp(struct pid *pgrp)
-{
-	struct task_struct *p;
-	struct pid *sid = NULL;
-
-	p = pid_task(pgrp, PIDTYPE_PGID);
-	if (p == NULL)
-		p = pid_task(pgrp, PIDTYPE_PID);
-	if (p != NULL)
-		sid = task_session(p);
-
-	return sid;
-}
-
-/**
- *	tiocgpgrp		-	get process group
- *	@tty: tty passed by user
- *	@real_tty: tty side of the tty passed by the user if a pty else the tty
- *	@p: returned pid
- *
- *	Obtain the process group of the tty. If there is no process group
- *	return an error.
- *
- *	Locking: none. Reference to current->signal->tty is safe.
- */
-
-static int tiocgpgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
-{
-	struct pid *pid;
-	int ret;
-	/*
-	 * (tty == real_tty) is a cheap way of
-	 * testing if the tty is NOT a master pty.
-	 */
-	if (tty == real_tty && current->signal->tty != real_tty)
-		return -ENOTTY;
-	pid = tty_get_pgrp(real_tty);
-	ret =  put_user(pid_vnr(pid), p);
-	put_pid(pid);
-	return ret;
-}
-
-/**
- *	tiocspgrp		-	attempt to set process group
- *	@tty: tty passed by user
- *	@real_tty: tty side device matching tty passed by user
- *	@p: pid pointer
- *
- *	Set the process group of the tty to the session passed. Only
- *	permitted where the tty session is our session.
- *
- *	Locking: RCU, ctrl lock
- */
-
-static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
-{
-	struct pid *pgrp;
-	pid_t pgrp_nr;
-	int retval = tty_check_change(real_tty);
-
-	if (retval == -EIO)
-		return -ENOTTY;
-	if (retval)
-		return retval;
-	if (!current->signal->tty ||
-	    (current->signal->tty != real_tty) ||
-	    (real_tty->session != task_session(current)))
-		return -ENOTTY;
-	if (get_user(pgrp_nr, p))
-		return -EFAULT;
-	if (pgrp_nr < 0)
-		return -EINVAL;
-	rcu_read_lock();
-	pgrp = find_vpid(pgrp_nr);
-	retval = -ESRCH;
-	if (!pgrp)
-		goto out_unlock;
-	retval = -EPERM;
-	if (session_of_pgrp(pgrp) != task_session(current))
-		goto out_unlock;
-	retval = 0;
-	spin_lock_irq(&tty->ctrl_lock);
-	put_pid(real_tty->pgrp);
-	real_tty->pgrp = get_pid(pgrp);
-	spin_unlock_irq(&tty->ctrl_lock);
-out_unlock:
-	rcu_read_unlock();
-	return retval;
-}
-
-/**
- *	tiocgsid		-	get session id
- *	@tty: tty passed by user
- *	@real_tty: tty side of the tty passed by the user if a pty else the tty
- *	@p: pointer to returned session id
- *
- *	Obtain the session id of the tty. If there is no session
- *	return an error.
- *
- *	Locking: none. Reference to current->signal->tty is safe.
- */
-
-static int tiocgsid(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
-{
-	/*
-	 * (tty == real_tty) is a cheap way of
-	 * testing if the tty is NOT a master pty.
-	*/
-	if (tty == real_tty && current->signal->tty != real_tty)
-		return -ENOTTY;
-	if (!real_tty->session)
-		return -ENOTTY;
-	return put_user(pid_vnr(real_tty->session), p);
-}
-
-/**
  *	tiocsetd	-	set line discipline
  *	@tty: tty device
  *	@p: pointer to user data
@@ -2920,19 +2404,6 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 		int excl = test_bit(TTY_EXCLUSIVE, &tty->flags);
 		return put_user(excl, (int __user *)p);
 	}
-	case TIOCNOTTY:
-		if (current->signal->tty != tty)
-			return -ENOTTY;
-		no_tty();
-		return 0;
-	case TIOCSCTTY:
-		return tiocsctty(real_tty, file, arg);
-	case TIOCGPGRP:
-		return tiocgpgrp(tty, real_tty, p);
-	case TIOCSPGRP:
-		return tiocspgrp(tty, real_tty, p);
-	case TIOCGSID:
-		return tiocgsid(tty, real_tty, p);
 	case TIOCGETD:
 		return tiocgetd(tty, p);
 	case TIOCSETD:
@@ -2993,6 +2464,10 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 	case TIOCSSERIAL:
 		tty_warn_deprecated_flags(p);
 		break;
+	default:
+		retval = tty_jobctrl_ioctl(tty, real_tty, file, cmd, arg);
+		if (retval != -ENOIOCTLCMD)
+			return retval;
 	}
 	if (tty->ops->ioctl) {
 		retval = tty->ops->ioctl(tty, cmd, arg);
diff --git a/drivers/tty/tty_jobctrl.c b/drivers/tty/tty_jobctrl.c
new file mode 100644
index 0000000000..e7032309ee
--- /dev/null
+++ b/drivers/tty/tty_jobctrl.c
@@ -0,0 +1,554 @@
+/*
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ */
+
+#include <linux/types.h>
+#include <linux/errno.h>
+#include <linux/signal.h>
+#include <linux/sched/signal.h>
+#include <linux/sched/task.h>
+#include <linux/tty.h>
+#include <linux/fcntl.h>
+#include <linux/uaccess.h>
+
+static int is_ignored(int sig)
+{
+	return (sigismember(&current->blocked, sig) ||
+		current->sighand->action[sig-1].sa.sa_handler == SIG_IGN);
+}
+
+/**
+ *	tty_check_change	-	check for POSIX terminal changes
+ *	@tty: tty to check
+ *
+ *	If we try to write to, or set the state of, a terminal and we're
+ *	not in the foreground, send a SIGTTOU.  If the signal is blocked or
+ *	ignored, go ahead and perform the operation.  (POSIX 7.2)
+ *
+ *	Locking: ctrl_lock
+ */
+int __tty_check_change(struct tty_struct *tty, int sig)
+{
+	unsigned long flags;
+	struct pid *pgrp, *tty_pgrp;
+	int ret = 0;
+
+	if (current->signal->tty != tty)
+		return 0;
+
+	rcu_read_lock();
+	pgrp = task_pgrp(current);
+
+	spin_lock_irqsave(&tty->ctrl_lock, flags);
+	tty_pgrp = tty->pgrp;
+	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+	if (tty_pgrp && pgrp != tty->pgrp) {
+		if (is_ignored(sig)) {
+			if (sig == SIGTTIN)
+				ret = -EIO;
+		} else if (is_current_pgrp_orphaned())
+			ret = -EIO;
+		else {
+			kill_pgrp(pgrp, sig, 1);
+			set_thread_flag(TIF_SIGPENDING);
+			ret = -ERESTARTSYS;
+		}
+	}
+	rcu_read_unlock();
+
+	if (!tty_pgrp)
+		tty_warn(tty, "sig=%d, tty->pgrp == NULL!\n", sig);
+
+	return ret;
+}
+
+int tty_check_change(struct tty_struct *tty)
+{
+	return __tty_check_change(tty, SIGTTOU);
+}
+EXPORT_SYMBOL(tty_check_change);
+
+void proc_clear_tty(struct task_struct *p)
+{
+	unsigned long flags;
+	struct tty_struct *tty;
+	spin_lock_irqsave(&p->sighand->siglock, flags);
+	tty = p->signal->tty;
+	p->signal->tty = NULL;
+	spin_unlock_irqrestore(&p->sighand->siglock, flags);
+	tty_kref_put(tty);
+}
+
+/**
+ * proc_set_tty -  set the controlling terminal
+ *
+ * Only callable by the session leader and only if it does not already have
+ * a controlling terminal.
+ *
+ * Caller must hold:  tty_lock()
+ *		      a readlock on tasklist_lock
+ *		      sighand lock
+ */
+static void __proc_set_tty(struct tty_struct *tty)
+{
+	unsigned long flags;
+
+	spin_lock_irqsave(&tty->ctrl_lock, flags);
+	/*
+	 * The session and fg pgrp references will be non-NULL if
+	 * tiocsctty() is stealing the controlling tty
+	 */
+	put_pid(tty->session);
+	put_pid(tty->pgrp);
+	tty->pgrp = get_pid(task_pgrp(current));
+	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+	tty->session = get_pid(task_session(current));
+	if (current->signal->tty) {
+		tty_debug(tty, "current tty %s not NULL!!\n",
+			  current->signal->tty->name);
+		tty_kref_put(current->signal->tty);
+	}
+	put_pid(current->signal->tty_old_pgrp);
+	current->signal->tty = tty_kref_get(tty);
+	current->signal->tty_old_pgrp = NULL;
+}
+
+static void proc_set_tty(struct tty_struct *tty)
+{
+	spin_lock_irq(&current->sighand->siglock);
+	__proc_set_tty(tty);
+	spin_unlock_irq(&current->sighand->siglock);
+}
+
+/*
+ * Called by tty_open() to set the controlling tty if applicable.
+ */
+void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty)
+{
+	read_lock(&tasklist_lock);
+	spin_lock_irq(&current->sighand->siglock);
+	if (current->signal->leader &&
+	    !current->signal->tty &&
+	    tty->session == NULL) {
+		/*
+		 * Don't let a process that only has write access to the tty
+		 * obtain the privileges associated with having a tty as
+		 * controlling terminal (being able to reopen it with full
+		 * access through /dev/tty, being able to perform pushback).
+		 * Many distributions set the group of all ttys to "tty" and
+		 * grant write-only access to all terminals for setgid tty
+		 * binaries, which should not imply full privileges on all ttys.
+		 *
+		 * This could theoretically break old code that performs open()
+		 * on a write-only file descriptor. In that case, it might be
+		 * necessary to also permit this if
+		 * inode_permission(inode, MAY_READ) == 0.
+		 */
+		if (filp->f_mode & FMODE_READ)
+			__proc_set_tty(tty);
+	}
+	spin_unlock_irq(&current->sighand->siglock);
+	read_unlock(&tasklist_lock);
+}
+
+struct tty_struct *get_current_tty(void)
+{
+	struct tty_struct *tty;
+	unsigned long flags;
+
+	spin_lock_irqsave(&current->sighand->siglock, flags);
+	tty = tty_kref_get(current->signal->tty);
+	spin_unlock_irqrestore(&current->sighand->siglock, flags);
+	return tty;
+}
+EXPORT_SYMBOL_GPL(get_current_tty);
+
+/*
+ * Called from tty_release().
+ */
+void session_clear_tty(struct pid *session)
+{
+	struct task_struct *p;
+	do_each_pid_task(session, PIDTYPE_SID, p) {
+		proc_clear_tty(p);
+	} while_each_pid_task(session, PIDTYPE_SID, p);
+}
+
+/**
+ *	tty_signal_session_leader	- sends SIGHUP to session leader
+ *	@tty		controlling tty
+ *	@exit_session	if non-zero, signal all foreground group processes
+ *
+ *	Send SIGHUP and SIGCONT to the session leader and its process group.
+ *	Optionally, signal all processes in the foreground process group.
+ *
+ *	Returns the number of processes in the session with this tty
+ *	as their controlling terminal. This value is used to drop
+ *	tty references for those processes.
+ */
+int tty_signal_session_leader(struct tty_struct *tty, int exit_session)
+{
+	struct task_struct *p;
+	int refs = 0;
+	struct pid *tty_pgrp = NULL;
+
+	read_lock(&tasklist_lock);
+	if (tty->session) {
+		do_each_pid_task(tty->session, PIDTYPE_SID, p) {
+			spin_lock_irq(&p->sighand->siglock);
+			if (p->signal->tty == tty) {
+				p->signal->tty = NULL;
+				/* We defer the dereferences outside fo
+				   the tasklist lock */
+				refs++;
+			}
+			if (!p->signal->leader) {
+				spin_unlock_irq(&p->sighand->siglock);
+				continue;
+			}
+			__group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p);
+			__group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p);
+			put_pid(p->signal->tty_old_pgrp);  /* A noop */
+			spin_lock(&tty->ctrl_lock);
+			tty_pgrp = get_pid(tty->pgrp);
+			if (tty->pgrp)
+				p->signal->tty_old_pgrp = get_pid(tty->pgrp);
+			spin_unlock(&tty->ctrl_lock);
+			spin_unlock_irq(&p->sighand->siglock);
+		} while_each_pid_task(tty->session, PIDTYPE_SID, p);
+	}
+	read_unlock(&tasklist_lock);
+
+	if (tty_pgrp) {
+		if (exit_session)
+			kill_pgrp(tty_pgrp, SIGHUP, exit_session);
+		put_pid(tty_pgrp);
+	}
+
+	return refs;
+}
+
+/**
+ *	disassociate_ctty	-	disconnect controlling tty
+ *	@on_exit: true if exiting so need to "hang up" the session
+ *
+ *	This function is typically called only by the session leader, when
+ *	it wants to disassociate itself from its controlling tty.
+ *
+ *	It performs the following functions:
+ * 	(1)  Sends a SIGHUP and SIGCONT to the foreground process group
+ * 	(2)  Clears the tty from being controlling the session
+ * 	(3)  Clears the controlling tty for all processes in the
+ * 		session group.
+ *
+ *	The argument on_exit is set to 1 if called when a process is
+ *	exiting; it is 0 if called by the ioctl TIOCNOTTY.
+ *
+ *	Locking:
+ *		BTM is taken for hysterical raisons, and held when
+ *		  called from no_tty().
+ *		  tty_mutex is taken to protect tty
+ *		  ->siglock is taken to protect ->signal/->sighand
+ *		  tasklist_lock is taken to walk process list for sessions
+ *		    ->siglock is taken to protect ->signal/->sighand
+ */
+void disassociate_ctty(int on_exit)
+{
+	struct tty_struct *tty;
+
+	if (!current->signal->leader)
+		return;
+
+	tty = get_current_tty();
+	if (tty) {
+		if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY) {
+			tty_vhangup_session(tty);
+		} else {
+			struct pid *tty_pgrp = tty_get_pgrp(tty);
+			if (tty_pgrp) {
+				kill_pgrp(tty_pgrp, SIGHUP, on_exit);
+				if (!on_exit)
+					kill_pgrp(tty_pgrp, SIGCONT, on_exit);
+				put_pid(tty_pgrp);
+			}
+		}
+		tty_kref_put(tty);
+
+	} else if (on_exit) {
+		struct pid *old_pgrp;
+		spin_lock_irq(&current->sighand->siglock);
+		old_pgrp = current->signal->tty_old_pgrp;
+		current->signal->tty_old_pgrp = NULL;
+		spin_unlock_irq(&current->sighand->siglock);
+		if (old_pgrp) {
+			kill_pgrp(old_pgrp, SIGHUP, on_exit);
+			kill_pgrp(old_pgrp, SIGCONT, on_exit);
+			put_pid(old_pgrp);
+		}
+		return;
+	}
+
+	spin_lock_irq(&current->sighand->siglock);
+	put_pid(current->signal->tty_old_pgrp);
+	current->signal->tty_old_pgrp = NULL;
+
+	tty = tty_kref_get(current->signal->tty);
+	if (tty) {
+		unsigned long flags;
+		spin_lock_irqsave(&tty->ctrl_lock, flags);
+		put_pid(tty->session);
+		put_pid(tty->pgrp);
+		tty->session = NULL;
+		tty->pgrp = NULL;
+		spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+		tty_kref_put(tty);
+	}
+
+	spin_unlock_irq(&current->sighand->siglock);
+	/* Now clear signal->tty under the lock */
+	read_lock(&tasklist_lock);
+	session_clear_tty(task_session(current));
+	read_unlock(&tasklist_lock);
+}
+
+/**
+ *
+ *	no_tty	- Ensure the current process does not have a controlling tty
+ */
+void no_tty(void)
+{
+	/* FIXME: Review locking here. The tty_lock never covered any race
+	   between a new association and proc_clear_tty but possible we need
+	   to protect against this anyway */
+	struct task_struct *tsk = current;
+	disassociate_ctty(0);
+	proc_clear_tty(tsk);
+}
+
+/**
+ *	tiocsctty	-	set controlling tty
+ *	@tty: tty structure
+ *	@arg: user argument
+ *
+ *	This ioctl is used to manage job control. It permits a session
+ *	leader to set this tty as the controlling tty for the session.
+ *
+ *	Locking:
+ *		Takes tty_lock() to serialize proc_set_tty() for this tty
+ *		Takes tasklist_lock internally to walk sessions
+ *		Takes ->siglock() when updating signal->tty
+ */
+static int tiocsctty(struct tty_struct *tty, struct file *file, int arg)
+{
+	int ret = 0;
+
+	tty_lock(tty);
+	read_lock(&tasklist_lock);
+
+	if (current->signal->leader && (task_session(current) == tty->session))
+		goto unlock;
+
+	/*
+	 * The process must be a session leader and
+	 * not have a controlling tty already.
+	 */
+	if (!current->signal->leader || current->signal->tty) {
+		ret = -EPERM;
+		goto unlock;
+	}
+
+	if (tty->session) {
+		/*
+		 * This tty is already the controlling
+		 * tty for another session group!
+		 */
+		if (arg == 1 && capable(CAP_SYS_ADMIN)) {
+			/*
+			 * Steal it away
+			 */
+			session_clear_tty(tty->session);
+		} else {
+			ret = -EPERM;
+			goto unlock;
+		}
+	}
+
+	/* See the comment in tty_open_proc_set_tty(). */
+	if ((file->f_mode & FMODE_READ) == 0 && !capable(CAP_SYS_ADMIN)) {
+		ret = -EPERM;
+		goto unlock;
+	}
+
+	proc_set_tty(tty);
+unlock:
+	read_unlock(&tasklist_lock);
+	tty_unlock(tty);
+	return ret;
+}
+
+/**
+ *	tty_get_pgrp	-	return a ref counted pgrp pid
+ *	@tty: tty to read
+ *
+ *	Returns a refcounted instance of the pid struct for the process
+ *	group controlling the tty.
+ */
+struct pid *tty_get_pgrp(struct tty_struct *tty)
+{
+	unsigned long flags;
+	struct pid *pgrp;
+
+	spin_lock_irqsave(&tty->ctrl_lock, flags);
+	pgrp = get_pid(tty->pgrp);
+	spin_unlock_irqrestore(&tty->ctrl_lock, flags);
+
+	return pgrp;
+}
+EXPORT_SYMBOL_GPL(tty_get_pgrp);
+
+/*
+ * This checks not only the pgrp, but falls back on the pid if no
+ * satisfactory pgrp is found. I dunno - gdb doesn't work correctly
+ * without this...
+ *
+ * The caller must hold rcu lock or the tasklist lock.
+ */
+static struct pid *session_of_pgrp(struct pid *pgrp)
+{
+	struct task_struct *p;
+	struct pid *sid = NULL;
+
+	p = pid_task(pgrp, PIDTYPE_PGID);
+	if (p == NULL)
+		p = pid_task(pgrp, PIDTYPE_PID);
+	if (p != NULL)
+		sid = task_session(p);
+
+	return sid;
+}
+
+/**
+ *	tiocgpgrp		-	get process group
+ *	@tty: tty passed by user
+ *	@real_tty: tty side of the tty passed by the user if a pty else the tty
+ *	@p: returned pid
+ *
+ *	Obtain the process group of the tty. If there is no process group
+ *	return an error.
+ *
+ *	Locking: none. Reference to current->signal->tty is safe.
+ */
+static int tiocgpgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+	struct pid *pid;
+	int ret;
+	/*
+	 * (tty == real_tty) is a cheap way of
+	 * testing if the tty is NOT a master pty.
+	 */
+	if (tty == real_tty && current->signal->tty != real_tty)
+		return -ENOTTY;
+	pid = tty_get_pgrp(real_tty);
+	ret =  put_user(pid_vnr(pid), p);
+	put_pid(pid);
+	return ret;
+}
+
+/**
+ *	tiocspgrp		-	attempt to set process group
+ *	@tty: tty passed by user
+ *	@real_tty: tty side device matching tty passed by user
+ *	@p: pid pointer
+ *
+ *	Set the process group of the tty to the session passed. Only
+ *	permitted where the tty session is our session.
+ *
+ *	Locking: RCU, ctrl lock
+ */
+static int tiocspgrp(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+	struct pid *pgrp;
+	pid_t pgrp_nr;
+	int retval = tty_check_change(real_tty);
+
+	if (retval == -EIO)
+		return -ENOTTY;
+	if (retval)
+		return retval;
+	if (!current->signal->tty ||
+	    (current->signal->tty != real_tty) ||
+	    (real_tty->session != task_session(current)))
+		return -ENOTTY;
+	if (get_user(pgrp_nr, p))
+		return -EFAULT;
+	if (pgrp_nr < 0)
+		return -EINVAL;
+	rcu_read_lock();
+	pgrp = find_vpid(pgrp_nr);
+	retval = -ESRCH;
+	if (!pgrp)
+		goto out_unlock;
+	retval = -EPERM;
+	if (session_of_pgrp(pgrp) != task_session(current))
+		goto out_unlock;
+	retval = 0;
+	spin_lock_irq(&tty->ctrl_lock);
+	put_pid(real_tty->pgrp);
+	real_tty->pgrp = get_pid(pgrp);
+	spin_unlock_irq(&tty->ctrl_lock);
+out_unlock:
+	rcu_read_unlock();
+	return retval;
+}
+
+/**
+ *	tiocgsid		-	get session id
+ *	@tty: tty passed by user
+ *	@real_tty: tty side of the tty passed by the user if a pty else the tty
+ *	@p: pointer to returned session id
+ *
+ *	Obtain the session id of the tty. If there is no session
+ *	return an error.
+ *
+ *	Locking: none. Reference to current->signal->tty is safe.
+ */
+static int tiocgsid(struct tty_struct *tty, struct tty_struct *real_tty, pid_t __user *p)
+{
+	/*
+	 * (tty == real_tty) is a cheap way of
+	 * testing if the tty is NOT a master pty.
+	*/
+	if (tty == real_tty && current->signal->tty != real_tty)
+		return -ENOTTY;
+	if (!real_tty->session)
+		return -ENOTTY;
+	return put_user(pid_vnr(real_tty->session), p);
+}
+
+/*
+ * Called from tty_ioctl(). If tty is a pty then real_tty is the slave side,
+ * if not then tty == real_tty.
+ */
+long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
+		       struct file *file, unsigned int cmd, unsigned long arg)
+{
+	void __user *p = (void __user *)arg;
+
+	switch (cmd) {
+	case TIOCNOTTY:
+		if (current->signal->tty != tty)
+			return -ENOTTY;
+		no_tty();
+		return 0;
+	case TIOCSCTTY:
+		return tiocsctty(real_tty, file, arg);
+	case TIOCGPGRP:
+		return tiocgpgrp(tty, real_tty, p);
+	case TIOCSPGRP:
+		return tiocspgrp(tty, real_tty, p);
+	case TIOCGSID:
+		return tiocgsid(tty, real_tty, p);
+	}
+	return -ENOIOCTLCMD;
+}
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f1106d7c73..d07cd2105a 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -475,9 +475,13 @@ extern int tty_do_resize(struct tty_struct *tty, struct winsize *ws);
 extern int is_current_pgrp_orphaned(void);
 extern void tty_hangup(struct tty_struct *tty);
 extern void tty_vhangup(struct tty_struct *tty);
+extern void tty_vhangup_session(struct tty_struct *tty);
 extern int tty_hung_up_p(struct file *filp);
 extern void do_SAK(struct tty_struct *tty);
 extern void __do_SAK(struct tty_struct *tty);
+extern void tty_open_proc_set_tty(struct file *filp, struct tty_struct *tty);
+extern int tty_signal_session_leader(struct tty_struct *tty, int exit_session);
+extern void session_clear_tty(struct pid *session);
 extern void no_tty(void);
 extern void tty_buffer_free_all(struct tty_port *port);
 extern void tty_buffer_flush(struct tty_struct *tty, struct tty_ldisc *ld);
@@ -525,6 +529,8 @@ extern void tty_ldisc_flush(struct tty_struct *tty);
 extern long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_mode_ioctl(struct tty_struct *tty, struct file *file,
 			unsigned int cmd, unsigned long arg);
+extern long tty_jobctrl_ioctl(struct tty_struct *tty, struct tty_struct *real_tty,
+			      struct file *file, unsigned int cmd, unsigned long arg);
 extern int tty_perform_flush(struct tty_struct *tty, unsigned long arg);
 extern void tty_default_fops(struct file_operations *fops);
 extern struct tty_struct *alloc_tty_struct(struct tty_driver *driver, int idx);
-- 
2.9.3

[PATCH 4/4] serial: small Makefile reordering

[Nicolas Pitre]

Move 21285 entry down alongside other UART drivers to be more consistent
with the rest of the file. It is kept before 8250 though, to preserve the
existing link ordering between those two.

Signed-off-by: Nicolas Pitre <nico@linaro.org>
---
 drivers/tty/serial/Makefile | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/Makefile b/drivers/tty/serial/Makefile
index 2d6288bc45..53c03e0051 100644
--- a/drivers/tty/serial/Makefile
+++ b/drivers/tty/serial/Makefile
@@ -3,7 +3,6 @@
 #
 
 obj-$(CONFIG_SERIAL_CORE) += serial_core.o
-obj-$(CONFIG_SERIAL_21285) += 21285.o
 
 obj-$(CONFIG_SERIAL_EARLYCON) += earlycon.o
 obj-$(CONFIG_SERIAL_EARLYCON_ARM_SEMIHOST) += earlycon-arm-semihost.o
@@ -17,6 +16,8 @@ obj-$(CONFIG_SERIAL_SUNZILOG) += sunzilog.o
 obj-$(CONFIG_SERIAL_SUNSU) += sunsu.o
 obj-$(CONFIG_SERIAL_SUNSAB) += sunsab.o
 
+obj-$(CONFIG_SERIAL_21285) += 21285.o
+
 # Now bring in any enabled 8250/16450/16550 type drivers.
 obj-$(CONFIG_SERIAL_8250) += 8250/
 
-- 
2.9.3

Re: [PATCH 0/4] assorted TTY code cleanups

[Greg Kroah-Hartman]

On Wed, Apr 12, 2017 at 06:37:13PM -0400, Nicolas Pitre wrote:
> Those are, I hope, fairly uncontrovertial patches that should require very
> little review as they mostly do code movement providing nice cleanups.
> No logical changes are introduced by those patches.
> 
> My minitty patch series is based on top of this, and given the timing,
> I don't expect it to go upstream just yet. However the following patches
> could be merged separately for the next merge window.

All look good and are now applied, thanks.

greg k-h