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Message-Id: <1350592007-9216-14-git-send-email-jslaby@suse.cz>
Date: Thu, 18 Oct 2012 22:26:39 +0200
From: Jiri Slaby <jslaby@...e.cz>
To: gregkh@...uxfoundation.org
Cc: alan@...ux.intel.com, linux-kernel@...r.kernel.org,
jirislaby@...il.com
Subject: [PATCH 13/21] TTY: move ldisc data from tty_struct: simple members
Here we start moving all the n_tty related bits from tty_struct to
the newly defined n_tty_data struct in n_tty proper.
In this patch primitive members and bits are moved. The rest will be
done per-partes in the next patches.
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
drivers/tty/n_tty.c | 160 ++++++++++++++++++++++++++++++---------------------
drivers/tty/tty_io.c | 1 -
include/linux/tty.h | 5 --
3 files changed, 93 insertions(+), 73 deletions(-)
diff --git a/drivers/tty/n_tty.c b/drivers/tty/n_tty.c
index 3d1594e..bd775a7 100644
--- a/drivers/tty/n_tty.c
+++ b/drivers/tty/n_tty.c
@@ -74,13 +74,20 @@
#define ECHO_OP_ERASE_TAB 0x82
struct n_tty_data {
- char dummy;
+ unsigned int column;
+ unsigned long overrun_time;
+ int num_overrun;
+
+ unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
+ unsigned char echo_overrun:1;
};
static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
unsigned char __user *ptr)
{
- tty_audit_add_data(tty, &x, 1, tty->icanon);
+ struct n_tty_data *ldata = tty->disc_data;
+
+ tty_audit_add_data(tty, &x, 1, ldata->icanon);
return put_user(x, ptr);
}
@@ -96,6 +103,7 @@ static inline int tty_put_user(struct tty_struct *tty, unsigned char x,
static void n_tty_set_room(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
int left;
int old_left;
@@ -115,7 +123,7 @@ static void n_tty_set_room(struct tty_struct *tty)
* characters will be beeped.
*/
if (left <= 0)
- left = tty->icanon && !tty->canon_data;
+ left = ldata->icanon && !tty->canon_data;
old_left = tty->receive_room;
tty->receive_room = left;
@@ -183,6 +191,7 @@ static void check_unthrottle(struct tty_struct *tty)
static void reset_buffer_flags(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
unsigned long flags;
spin_lock_irqsave(&tty->read_lock, flags);
@@ -190,10 +199,10 @@ static void reset_buffer_flags(struct tty_struct *tty)
spin_unlock_irqrestore(&tty->read_lock, flags);
mutex_lock(&tty->echo_lock);
- tty->echo_pos = tty->echo_cnt = tty->echo_overrun = 0;
+ tty->echo_pos = tty->echo_cnt = ldata->echo_overrun = 0;
mutex_unlock(&tty->echo_lock);
- tty->canon_head = tty->canon_data = tty->erasing = 0;
+ tty->canon_head = tty->canon_data = ldata->erasing = 0;
memset(&tty->read_flags, 0, sizeof tty->read_flags);
n_tty_set_room(tty);
}
@@ -239,11 +248,12 @@ static void n_tty_flush_buffer(struct tty_struct *tty)
static ssize_t n_tty_chars_in_buffer(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
unsigned long flags;
ssize_t n = 0;
spin_lock_irqsave(&tty->read_lock, flags);
- if (!tty->icanon) {
+ if (!ldata->icanon) {
n = tty->read_cnt;
} else if (tty->canon_data) {
n = (tty->canon_head > tty->read_tail) ?
@@ -305,6 +315,7 @@ static inline int is_continuation(unsigned char c, struct tty_struct *tty)
static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
{
+ struct n_tty_data *ldata = tty->disc_data;
int spaces;
if (!space)
@@ -313,48 +324,48 @@ static int do_output_char(unsigned char c, struct tty_struct *tty, int space)
switch (c) {
case '\n':
if (O_ONLRET(tty))
- tty->column = 0;
+ ldata->column = 0;
if (O_ONLCR(tty)) {
if (space < 2)
return -1;
- tty->canon_column = tty->column = 0;
+ tty->canon_column = ldata->column = 0;
tty->ops->write(tty, "\r\n", 2);
return 2;
}
- tty->canon_column = tty->column;
+ tty->canon_column = ldata->column;
break;
case '\r':
- if (O_ONOCR(tty) && tty->column == 0)
+ if (O_ONOCR(tty) && ldata->column == 0)
return 0;
if (O_OCRNL(tty)) {
c = '\n';
if (O_ONLRET(tty))
- tty->canon_column = tty->column = 0;
+ tty->canon_column = ldata->column = 0;
break;
}
- tty->canon_column = tty->column = 0;
+ tty->canon_column = ldata->column = 0;
break;
case '\t':
- spaces = 8 - (tty->column & 7);
+ spaces = 8 - (ldata->column & 7);
if (O_TABDLY(tty) == XTABS) {
if (space < spaces)
return -1;
- tty->column += spaces;
+ ldata->column += spaces;
tty->ops->write(tty, " ", spaces);
return spaces;
}
- tty->column += spaces;
+ ldata->column += spaces;
break;
case '\b':
- if (tty->column > 0)
- tty->column--;
+ if (ldata->column > 0)
+ ldata->column--;
break;
default:
if (!iscntrl(c)) {
if (O_OLCUC(tty))
c = toupper(c);
if (!is_continuation(c, tty))
- tty->column++;
+ ldata->column++;
}
break;
}
@@ -415,6 +426,7 @@ static int process_output(unsigned char c, struct tty_struct *tty)
static ssize_t process_output_block(struct tty_struct *tty,
const unsigned char *buf, unsigned int nr)
{
+ struct n_tty_data *ldata = tty->disc_data;
int space;
int i;
const unsigned char *cp;
@@ -435,30 +447,30 @@ static ssize_t process_output_block(struct tty_struct *tty,
switch (c) {
case '\n':
if (O_ONLRET(tty))
- tty->column = 0;
+ ldata->column = 0;
if (O_ONLCR(tty))
goto break_out;
- tty->canon_column = tty->column;
+ tty->canon_column = ldata->column;
break;
case '\r':
- if (O_ONOCR(tty) && tty->column == 0)
+ if (O_ONOCR(tty) && ldata->column == 0)
goto break_out;
if (O_OCRNL(tty))
goto break_out;
- tty->canon_column = tty->column = 0;
+ tty->canon_column = ldata->column = 0;
break;
case '\t':
goto break_out;
case '\b':
- if (tty->column > 0)
- tty->column--;
+ if (ldata->column > 0)
+ ldata->column--;
break;
default:
if (!iscntrl(c)) {
if (O_OLCUC(tty))
goto break_out;
if (!is_continuation(c, tty))
- tty->column++;
+ ldata->column++;
}
break;
}
@@ -498,6 +510,7 @@ break_out:
static void process_echoes(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
int space, nr;
unsigned char c;
unsigned char *cp, *buf_end;
@@ -559,22 +572,22 @@ static void process_echoes(struct tty_struct *tty)
space -= num_bs;
while (num_bs--) {
tty_put_char(tty, '\b');
- if (tty->column > 0)
- tty->column--;
+ if (ldata->column > 0)
+ ldata->column--;
}
cp += 3;
nr -= 3;
break;
case ECHO_OP_SET_CANON_COL:
- tty->canon_column = tty->column;
+ tty->canon_column = ldata->column;
cp += 2;
nr -= 2;
break;
case ECHO_OP_MOVE_BACK_COL:
- if (tty->column > 0)
- tty->column--;
+ if (ldata->column > 0)
+ ldata->column--;
cp += 2;
nr -= 2;
break;
@@ -586,7 +599,7 @@ static void process_echoes(struct tty_struct *tty)
break;
}
tty_put_char(tty, ECHO_OP_START);
- tty->column++;
+ ldata->column++;
space--;
cp += 2;
nr -= 2;
@@ -608,7 +621,7 @@ static void process_echoes(struct tty_struct *tty)
}
tty_put_char(tty, '^');
tty_put_char(tty, op ^ 0100);
- tty->column += 2;
+ ldata->column += 2;
space -= 2;
cp += 2;
nr -= 2;
@@ -641,14 +654,14 @@ static void process_echoes(struct tty_struct *tty)
if (nr == 0) {
tty->echo_pos = 0;
tty->echo_cnt = 0;
- tty->echo_overrun = 0;
+ ldata->echo_overrun = 0;
} else {
int num_processed = tty->echo_cnt - nr;
tty->echo_pos += num_processed;
tty->echo_pos &= N_TTY_BUF_SIZE - 1;
tty->echo_cnt = nr;
if (num_processed > 0)
- tty->echo_overrun = 0;
+ ldata->echo_overrun = 0;
}
mutex_unlock(&tty->echo_lock);
@@ -670,6 +683,7 @@ static void process_echoes(struct tty_struct *tty)
static void add_echo_byte(unsigned char c, struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
int new_byte_pos;
if (tty->echo_cnt == N_TTY_BUF_SIZE) {
@@ -695,7 +709,7 @@ static void add_echo_byte(unsigned char c, struct tty_struct *tty)
}
tty->echo_pos &= N_TTY_BUF_SIZE - 1;
- tty->echo_overrun = 1;
+ ldata->echo_overrun = 1;
} else {
new_byte_pos = tty->echo_pos + tty->echo_cnt;
new_byte_pos &= N_TTY_BUF_SIZE - 1;
@@ -845,9 +859,10 @@ static void echo_char(unsigned char c, struct tty_struct *tty)
static inline void finish_erasing(struct tty_struct *tty)
{
- if (tty->erasing) {
+ struct n_tty_data *ldata = tty->disc_data;
+ if (ldata->erasing) {
echo_char_raw('/', tty);
- tty->erasing = 0;
+ ldata->erasing = 0;
}
}
@@ -865,6 +880,7 @@ static inline void finish_erasing(struct tty_struct *tty)
static void eraser(unsigned char c, struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
enum { ERASE, WERASE, KILL } kill_type;
int head, seen_alnums, cnt;
unsigned long flags;
@@ -932,9 +948,9 @@ static void eraser(unsigned char c, struct tty_struct *tty)
spin_unlock_irqrestore(&tty->read_lock, flags);
if (L_ECHO(tty)) {
if (L_ECHOPRT(tty)) {
- if (!tty->erasing) {
+ if (!ldata->erasing) {
echo_char_raw('\\', tty);
- tty->erasing = 1;
+ ldata->erasing = 1;
}
/* if cnt > 1, output a multi-byte character */
echo_char(c, tty);
@@ -1056,16 +1072,17 @@ static inline void n_tty_receive_break(struct tty_struct *tty)
static inline void n_tty_receive_overrun(struct tty_struct *tty)
{
+ struct n_tty_data *ldata = tty->disc_data;
char buf[64];
- tty->num_overrun++;
- if (time_before(tty->overrun_time, jiffies - HZ) ||
- time_after(tty->overrun_time, jiffies)) {
+ ldata->num_overrun++;
+ if (time_after(jiffies, ldata->overrun_time + HZ) ||
+ time_after(ldata->overrun_time, jiffies)) {
printk(KERN_WARNING "%s: %d input overrun(s)\n",
tty_name(tty, buf),
- tty->num_overrun);
- tty->overrun_time = jiffies;
- tty->num_overrun = 0;
+ ldata->num_overrun);
+ ldata->overrun_time = jiffies;
+ ldata->num_overrun = 0;
}
}
@@ -1105,10 +1122,11 @@ static inline void n_tty_receive_parity_error(struct tty_struct *tty,
static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
{
+ struct n_tty_data *ldata = tty->disc_data;
unsigned long flags;
int parmrk;
- if (tty->raw) {
+ if (ldata->raw) {
put_tty_queue(c, tty);
return;
}
@@ -1147,8 +1165,8 @@ static inline void n_tty_receive_char(struct tty_struct *tty, unsigned char c)
* handle specially, do shortcut processing to speed things
* up.
*/
- if (!test_bit(c, tty->process_char_map) || tty->lnext) {
- tty->lnext = 0;
+ if (!test_bit(c, tty->process_char_map) || ldata->lnext) {
+ ldata->lnext = 0;
parmrk = (c == (unsigned char) '\377' && I_PARMRK(tty)) ? 1 : 0;
if (tty->read_cnt >= (N_TTY_BUF_SIZE - parmrk - 1)) {
/* beep if no space */
@@ -1222,7 +1240,7 @@ send_signal:
} else if (c == '\n' && I_INLCR(tty))
c = '\r';
- if (tty->icanon) {
+ if (ldata->icanon) {
if (c == ERASE_CHAR(tty) || c == KILL_CHAR(tty) ||
(c == WERASE_CHAR(tty) && L_IEXTEN(tty))) {
eraser(c, tty);
@@ -1230,7 +1248,7 @@ send_signal:
return;
}
if (c == LNEXT_CHAR(tty) && L_IEXTEN(tty)) {
- tty->lnext = 1;
+ ldata->lnext = 1;
if (L_ECHO(tty)) {
finish_erasing(tty);
if (L_ECHOCTL(tty)) {
@@ -1373,13 +1391,14 @@ static void n_tty_write_wakeup(struct tty_struct *tty)
static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
char *fp, int count)
{
+ struct n_tty_data *ldata = tty->disc_data;
const unsigned char *p;
char *f, flags = TTY_NORMAL;
int i;
char buf[64];
unsigned long cpuflags;
- if (tty->real_raw) {
+ if (ldata->real_raw) {
spin_lock_irqsave(&tty->read_lock, cpuflags);
i = min(N_TTY_BUF_SIZE - tty->read_cnt,
N_TTY_BUF_SIZE - tty->read_head);
@@ -1427,7 +1446,7 @@ static void n_tty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
n_tty_set_room(tty);
- if ((!tty->icanon && (tty->read_cnt >= tty->minimum_to_wake)) ||
+ if ((!ldata->icanon && (tty->read_cnt >= tty->minimum_to_wake)) ||
L_EXTPROC(tty)) {
kill_fasync(&tty->fasync, SIGIO, POLL_IN);
if (waitqueue_active(&tty->read_wait))
@@ -1471,6 +1490,7 @@ int is_ignored(int sig)
static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
{
+ struct n_tty_data *ldata = tty->disc_data;
int canon_change = 1;
if (old)
@@ -1479,16 +1499,16 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
memset(&tty->read_flags, 0, sizeof tty->read_flags);
tty->canon_head = tty->read_tail;
tty->canon_data = 0;
- tty->erasing = 0;
+ ldata->erasing = 0;
}
if (canon_change && !L_ICANON(tty) && tty->read_cnt)
wake_up_interruptible(&tty->read_wait);
- tty->icanon = (L_ICANON(tty) != 0);
+ ldata->icanon = (L_ICANON(tty) != 0);
if (test_bit(TTY_HW_COOK_IN, &tty->flags)) {
- tty->raw = 1;
- tty->real_raw = 1;
+ ldata->raw = 1;
+ ldata->real_raw = 1;
n_tty_set_room(tty);
return;
}
@@ -1531,16 +1551,16 @@ static void n_tty_set_termios(struct tty_struct *tty, struct ktermios *old)
set_bit(SUSP_CHAR(tty), tty->process_char_map);
}
clear_bit(__DISABLED_CHAR, tty->process_char_map);
- tty->raw = 0;
- tty->real_raw = 0;
+ ldata->raw = 0;
+ ldata->real_raw = 0;
} else {
- tty->raw = 1;
+ ldata->raw = 1;
if ((I_IGNBRK(tty) || (!I_BRKINT(tty) && !I_PARMRK(tty))) &&
(I_IGNPAR(tty) || !I_INPCK(tty)) &&
(tty->driver->flags & TTY_DRIVER_REAL_RAW))
- tty->real_raw = 1;
+ ldata->real_raw = 1;
else
- tty->real_raw = 0;
+ ldata->real_raw = 0;
}
n_tty_set_room(tty);
/* The termios change make the tty ready for I/O */
@@ -1589,6 +1609,8 @@ static int n_tty_open(struct tty_struct *tty)
if (!ldata)
goto err;
+ ldata->overrun_time = jiffies;
+
/* These are ugly. Currently a malloc failure here can panic */
tty->read_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
tty->echo_buf = kzalloc(N_TTY_BUF_SIZE, GFP_KERNEL);
@@ -1598,7 +1620,7 @@ static int n_tty_open(struct tty_struct *tty)
tty->disc_data = ldata;
reset_buffer_flags(tty);
tty_unthrottle(tty);
- tty->column = 0;
+ ldata->column = 0;
n_tty_set_termios(tty, NULL);
tty->minimum_to_wake = 1;
tty->closing = 0;
@@ -1614,8 +1636,10 @@ err:
static inline int input_available_p(struct tty_struct *tty, int amt)
{
+ struct n_tty_data *ldata = tty->disc_data;
+
tty_flush_to_ldisc(tty);
- if (tty->icanon && !L_EXTPROC(tty)) {
+ if (ldata->icanon && !L_EXTPROC(tty)) {
if (tty->canon_data)
return 1;
} else if (tty->read_cnt >= (amt ? amt : 1))
@@ -1646,6 +1670,7 @@ static int copy_from_read_buf(struct tty_struct *tty,
size_t *nr)
{
+ struct n_tty_data *ldata = tty->disc_data;
int retval;
size_t n;
unsigned long flags;
@@ -1662,12 +1687,12 @@ static int copy_from_read_buf(struct tty_struct *tty,
is_eof = n == 1 &&
tty->read_buf[tty->read_tail] == EOF_CHAR(tty);
tty_audit_add_data(tty, &tty->read_buf[tty->read_tail], n,
- tty->icanon);
+ ldata->icanon);
spin_lock_irqsave(&tty->read_lock, flags);
tty->read_tail = (tty->read_tail + n) & (N_TTY_BUF_SIZE-1);
tty->read_cnt -= n;
/* Turn single EOF into zero-length read */
- if (L_EXTPROC(tty) && tty->icanon && is_eof && !tty->read_cnt)
+ if (L_EXTPROC(tty) && ldata->icanon && is_eof && !tty->read_cnt)
n = 0;
spin_unlock_irqrestore(&tty->read_lock, flags);
*b += n;
@@ -1736,6 +1761,7 @@ static int job_control(struct tty_struct *tty, struct file *file)
static ssize_t n_tty_read(struct tty_struct *tty, struct file *file,
unsigned char __user *buf, size_t nr)
{
+ struct n_tty_data *ldata = tty->disc_data;
unsigned char __user *b = buf;
DECLARE_WAITQUEUE(wait, current);
int c;
@@ -1753,7 +1779,7 @@ do_it_again:
minimum = time = 0;
timeout = MAX_SCHEDULE_TIMEOUT;
- if (!tty->icanon) {
+ if (!ldata->icanon) {
time = (HZ / 10) * TIME_CHAR(tty);
minimum = MIN_CHAR(tty);
if (minimum) {
@@ -1846,7 +1872,7 @@ do_it_again:
nr--;
}
- if (tty->icanon && !L_EXTPROC(tty)) {
+ if (ldata->icanon && !L_EXTPROC(tty)) {
/* N.B. avoid overrun if nr == 0 */
spin_lock_irqsave(&tty->read_lock, flags);
while (nr && tty->read_cnt) {
diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index e835a5b8..67b024c 100644
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2932,7 +2932,6 @@ void initialize_tty_struct(struct tty_struct *tty,
tty_ldisc_init(tty);
tty->session = NULL;
tty->pgrp = NULL;
- tty->overrun_time = jiffies;
tty_buffer_init(tty);
mutex_init(&tty->legacy_mutex);
mutex_init(&tty->termios_mutex);
diff --git a/include/linux/tty.h b/include/linux/tty.h
index f02712d..de590ce 100644
--- a/include/linux/tty.h
+++ b/include/linux/tty.h
@@ -270,13 +270,8 @@ struct tty_struct {
* historical reasons, this is included in the tty structure.
* Mostly locked by the BKL.
*/
- unsigned int column;
- unsigned char lnext:1, erasing:1, raw:1, real_raw:1, icanon:1;
unsigned char closing:1;
- unsigned char echo_overrun:1;
unsigned short minimum_to_wake;
- unsigned long overrun_time;
- int num_overrun;
unsigned long process_char_map[256/(8*sizeof(unsigned long))];
char *read_buf;
int read_head;
--
1.7.12.3
--
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