* alloc_tty_struct() always uses kmalloc() -- Andrew Morton <andrewm@uow.edu.eu> 17Mar01
*/
-#include <linux/config.h>
#include <linux/types.h>
#include <linux/major.h>
#include <linux/errno.h>
#include <linux/kbd_kern.h>
#include <linux/vt_kern.h>
#include <linux/selection.h>
-#include <linux/devfs_fs_kernel.h>
#include <linux/kmod.h>
/* Semaphore to protect creating and releasing a tty. This is shared with
vt.c for deeply disgusting hack reasons */
-DECLARE_MUTEX(tty_sem);
+DEFINE_MUTEX(tty_mutex);
#ifdef CONFIG_UNIX98_PTYS
extern struct tty_driver *ptm_driver; /* Unix98 pty masters; for /dev/ptmx */
static void tty_buffer_init(struct tty_struct *tty)
{
+ spin_lock_init(&tty->buf.lock);
tty->buf.head = NULL;
tty->buf.tail = NULL;
tty->buf.free = NULL;
p->used = 0;
p->size = size;
p->next = NULL;
+ p->commit = 0;
+ p->read = 0;
p->char_buf_ptr = (char *)(p->data);
p->flag_buf_ptr = (unsigned char *)p->char_buf_ptr + size;
/* printk("Flip create %p\n", p); */
*tbh = t->next;
t->next = NULL;
t->used = 0;
+ t->commit = 0;
+ t->read = 0;
/* DEBUG ONLY */
- memset(t->data, '*', size);
+/* memset(t->data, '*', size); */
/* printk("Flip recycle %p\n", t); */
return t;
}
int tty_buffer_request_room(struct tty_struct *tty, size_t size)
{
- struct tty_buffer *b = tty->buf.tail, *n;
- int left = 0;
+ struct tty_buffer *b, *n;
+ int left;
+ unsigned long flags;
+
+ spin_lock_irqsave(&tty->buf.lock, flags);
/* OPTIMISATION: We could keep a per tty "zero" sized buffer to
remove this conditional if its worth it. This would be invisible
to the callers */
- if(b != NULL)
+ if ((b = tty->buf.tail) != NULL)
left = b->size - b->used;
- if(left >= size)
- return size;
- /* This is the slow path - looking for new buffers to use */
- n = tty_buffer_find(tty, size);
- if(n == NULL)
- return left;
- if(b != NULL)
- b->next = n;
else
- tty->buf.head = n;
- tty->buf.tail = n;
+ left = 0;
+
+ if (left < size) {
+ /* This is the slow path - looking for new buffers to use */
+ if ((n = tty_buffer_find(tty, size)) != NULL) {
+ if (b != NULL) {
+ b->next = n;
+ b->commit = b->used;
+ } else
+ tty->buf.head = n;
+ tty->buf.tail = n;
+ } else
+ size = left;
+ }
+
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
return size;
}
-
EXPORT_SYMBOL_GPL(tty_buffer_request_room);
-int tty_insert_flip_string(struct tty_struct *tty, unsigned char *chars, size_t size)
+int tty_insert_flip_string(struct tty_struct *tty, const unsigned char *chars,
+ size_t size)
{
int copied = 0;
do {
tb->used += space;
copied += space;
chars += space;
-/* printk("Flip insert %d.\n", space); */
}
/* There is a small chance that we need to split the data over
several buffers. If this is the case we must loop */
while (unlikely(size > copied));
return copied;
}
+EXPORT_SYMBOL(tty_insert_flip_string);
-EXPORT_SYMBOL_GPL(tty_insert_flip_string);
-
-int tty_insert_flip_string_flags(struct tty_struct *tty, unsigned char *chars, char *flags, size_t size)
+int tty_insert_flip_string_flags(struct tty_struct *tty,
+ const unsigned char *chars, const char *flags, size_t size)
{
int copied = 0;
do {
while (unlikely(size > copied));
return copied;
}
+EXPORT_SYMBOL(tty_insert_flip_string_flags);
-EXPORT_SYMBOL_GPL(tty_insert_flip_string_flags);
-
+void tty_schedule_flip(struct tty_struct *tty)
+{
+ unsigned long flags;
+ spin_lock_irqsave(&tty->buf.lock, flags);
+ if (tty->buf.tail != NULL)
+ tty->buf.tail->commit = tty->buf.tail->used;
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
+ schedule_delayed_work(&tty->buf.work, 1);
+}
+EXPORT_SYMBOL(tty_schedule_flip);
/*
* Prepare a block of space in the buffer for data. Returns the length
int tty_prepare_flip_string(struct tty_struct *tty, unsigned char **chars, size_t size)
{
int space = tty_buffer_request_room(tty, size);
- struct tty_buffer *tb = tty->buf.tail;
- *chars = tb->char_buf_ptr + tb->used;
- memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
- tb->used += space;
+ if (likely(space)) {
+ struct tty_buffer *tb = tty->buf.tail;
+ *chars = tb->char_buf_ptr + tb->used;
+ memset(tb->flag_buf_ptr + tb->used, TTY_NORMAL, space);
+ tb->used += space;
+ }
return space;
}
int tty_prepare_flip_string_flags(struct tty_struct *tty, unsigned char **chars, char **flags, size_t size)
{
int space = tty_buffer_request_room(tty, size);
- struct tty_buffer *tb = tty->buf.tail;
- *chars = tb->char_buf_ptr + tb->used;
- *flags = tb->flag_buf_ptr + tb->used;
- tb->used += space;
+ if (likely(space)) {
+ struct tty_buffer *tb = tty->buf.tail;
+ *chars = tb->char_buf_ptr + tb->used;
+ *flags = tb->flag_buf_ptr + tb->used;
+ tb->used += space;
+ }
return space;
}
struct tty_ldisc *ld;
unsigned long flags;
- if (disc < N_TTY || disc >= NR_LDISCS)
- BUG();
+ BUG_ON(disc < N_TTY || disc >= NR_LDISCS);
spin_lock_irqsave(&tty_ldisc_lock, flags);
ld = &tty_ldiscs[disc];
- if(ld->refcount == 0)
- BUG();
- ld->refcount --;
+ BUG_ON(ld->refcount == 0);
+ ld->refcount--;
module_put(ld->owner);
spin_unlock_irqrestore(&tty_ldisc_lock, flags);
}
{
unsigned long flags;
- if(ld == NULL)
- BUG();
+ BUG_ON(ld == NULL);
spin_lock_irqsave(&tty_ldisc_lock, flags);
if(ld->refcount == 0)
}
clear_bit(TTY_LDISC, &tty->flags);
- clear_bit(TTY_DONT_FLIP, &tty->flags);
- if (o_tty) {
+ if (o_tty)
clear_bit(TTY_LDISC, &o_tty->flags);
- clear_bit(TTY_DONT_FLIP, &o_tty->flags);
- }
spin_unlock_irqrestore(&tty_ldisc_lock, flags);
/*
return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
}
-static struct file_operations tty_fops = {
+static const struct file_operations tty_fops = {
.llseek = no_llseek,
.read = tty_read,
.write = tty_write,
};
#ifdef CONFIG_UNIX98_PTYS
-static struct file_operations ptmx_fops = {
+static const struct file_operations ptmx_fops = {
.llseek = no_llseek,
.read = tty_read,
.write = tty_write,
};
#endif
-static struct file_operations console_fops = {
+static const struct file_operations console_fops = {
.llseek = no_llseek,
.read = tty_read,
.write = redirected_tty_write,
.fasync = tty_fasync,
};
-static struct file_operations hung_up_tty_fops = {
+static const struct file_operations hung_up_tty_fops = {
.llseek = no_llseek,
.read = hung_up_tty_read,
.write = hung_up_tty_write,
p->signal->tty = NULL;
if (!p->signal->leader)
continue;
- send_group_sig_info(SIGHUP, SEND_SIG_PRIV, p);
- send_group_sig_info(SIGCONT, SEND_SIG_PRIV, p);
+ group_send_sig_info(SIGHUP, SEND_SIG_PRIV, p);
+ group_send_sig_info(SIGCONT, SEND_SIG_PRIV, p);
if (tty->pgrp > 0)
p->signal->tty_old_pgrp = tty->pgrp;
} while_each_task_pid(tty->session, PIDTYPE_SID, p);
lock_kernel();
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
tty = current->signal->tty;
if (tty) {
tty_pgrp = tty->pgrp;
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
if (on_exit && tty->driver->type != TTY_DRIVER_TYPE_PTY)
tty_vhangup(tty);
} else {
kill_pg(current->signal->tty_old_pgrp, SIGHUP, on_exit);
kill_pg(current->signal->tty_old_pgrp, SIGCONT, on_exit);
}
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
unlock_kernel();
return;
}
}
/* Must lock changes to tty_old_pgrp */
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
current->signal->tty_old_pgrp = 0;
tty->session = 0;
tty->pgrp = -1;
p->signal->tty = NULL;
} while_each_task_pid(current->signal->session, PIDTYPE_SID, p);
read_unlock(&tasklist_lock);
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
unlock_kernel();
}
ssize_t ret = 0, written = 0;
unsigned int chunk;
- if (down_interruptible(&tty->atomic_write)) {
+ if (mutex_lock_interruptible(&tty->atomic_write_lock)) {
return -ERESTARTSYS;
}
if (count < chunk)
chunk = count;
- /* write_buf/write_cnt is protected by the atomic_write semaphore */
+ /* write_buf/write_cnt is protected by the atomic_write_lock mutex */
if (tty->write_cnt < chunk) {
unsigned char *buf;
buf = kmalloc(chunk, GFP_KERNEL);
if (!buf) {
- up(&tty->atomic_write);
+ mutex_unlock(&tty->atomic_write_lock);
return -ENOMEM;
}
kfree(tty->write_buf);
inode->i_mtime = current_fs_time(inode->i_sb);
ret = written;
}
- up(&tty->atomic_write);
+ mutex_unlock(&tty->atomic_write_lock);
return ret;
}
/*
* WSH 06/09/97: Rewritten to remove races and properly clean up after a
- * failed open. The new code protects the open with a semaphore, so it's
- * really quite straightforward. The semaphore locking can probably be
+ * failed open. The new code protects the open with a mutex, so it's
+ * really quite straightforward. The mutex locking can probably be
* relaxed for the (most common) case of reopening a tty.
*/
static int init_dev(struct tty_driver *driver, int idx,
success:
*ret_tty = tty;
- /* All paths come through here to release the semaphore */
+ /* All paths come through here to release the mutex */
end_init:
return retval;
{
struct tty_struct *tty, *o_tty;
int pty_master, tty_closing, o_tty_closing, do_sleep;
- int devpts_master, devpts;
+ int devpts;
int idx;
char buf[64];
unsigned long flags;
pty_master = (tty->driver->type == TTY_DRIVER_TYPE_PTY &&
tty->driver->subtype == PTY_TYPE_MASTER);
devpts = (tty->driver->flags & TTY_DRIVER_DEVPTS_MEM) != 0;
- devpts_master = pty_master && devpts;
o_tty = tty->link;
#ifdef TTY_PARANOIA_CHECK
/* Guard against races with tty->count changes elsewhere and
opens on /dev/tty */
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
tty_closing = tty->count <= 1;
o_tty_closing = o_tty &&
(o_tty->count <= (pty_master ? 1 : 0));
- up(&tty_sem);
do_sleep = 0;
if (tty_closing) {
printk(KERN_WARNING "release_dev: %s: read/write wait queue "
"active!\n", tty_name(tty, buf));
+ mutex_unlock(&tty_mutex);
schedule();
}
* both sides, and we've completed the last operation that could
* block, so it's safe to proceed with closing.
*/
-
- down(&tty_sem);
if (pty_master) {
if (--o_tty->count < 0) {
printk(KERN_WARNING "release_dev: bad pty slave count "
tty->count, tty_name(tty, buf));
tty->count = 0;
}
- up(&tty_sem);
/*
* We've decremented tty->count, so we need to remove this file
read_unlock(&tasklist_lock);
}
+ mutex_unlock(&tty_mutex);
+
/* check whether both sides are closing ... */
if (!tty_closing || (o_tty && !o_tty_closing))
return;
* race with the set_ldisc code path.
*/
clear_bit(TTY_LDISC, &tty->flags);
- clear_bit(TTY_DONT_FLIP, &tty->flags);
cancel_delayed_work(&tty->buf.work);
/*
index = -1;
retval = 0;
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
if (device == MKDEV(TTYAUX_MAJOR,0)) {
if (!current->signal->tty) {
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
return -ENXIO;
}
driver = current->signal->tty->driver;
noctty = 1;
goto got_driver;
}
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
return -ENODEV;
}
driver = get_tty_driver(device, &index);
if (!driver) {
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
return -ENODEV;
}
got_driver:
retval = init_dev(driver, index, &tty);
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
if (retval)
return retval;
}
up(&allocated_ptys_lock);
- down(&tty_sem);
+ mutex_lock(&tty_mutex);
retval = init_dev(ptm_driver, index, &tty);
- up(&tty_sem);
+ mutex_unlock(&tty_mutex);
if (retval)
goto out;
return 0;
out1:
release_dev(filp);
+ return retval;
out:
down(&allocated_ptys_lock);
idr_remove(&allocated_ptys, index);
static int tiocsctty(struct tty_struct *tty, int arg)
{
- task_t *p;
+ struct task_struct *p;
if (current->signal->leader &&
(current->signal->session == tty->session))
tty->driver->break_ctl(tty, 0);
return 0;
case TCSBRK: /* SVID version: non-zero arg --> no break */
- /*
- * XXX is the above comment correct, or the
- * code below correct? Is this ioctl used at
- * all by anyone?
+ /* non-zero arg means wait for all output data
+ * to be sent (performed above) but don't send break.
+ * This is used by the tcdrain() termios function.
*/
if (!arg)
return send_break(tty, 250);
tty_hangup(tty);
#else
struct tty_struct *tty = arg;
- struct task_struct *p;
+ struct task_struct *g, *p;
int session;
int i;
struct file *filp;
tty->driver->flush_buffer(tty);
read_lock(&tasklist_lock);
+ /* Kill the entire session */
do_each_task_pid(session, PIDTYPE_SID, p) {
- if (p->signal->tty == tty || session > 0) {
+ printk(KERN_NOTICE "SAK: killed process %d"
+ " (%s): p->signal->session==tty->session\n",
+ p->pid, p->comm);
+ send_sig(SIGKILL, p, 1);
+ } while_each_task_pid(session, PIDTYPE_SID, p);
+ /* Now kill any processes that happen to have the
+ * tty open.
+ */
+ do_each_thread(g, p) {
+ if (p->signal->tty == tty) {
printk(KERN_NOTICE "SAK: killed process %d"
" (%s): p->signal->session==tty->session\n",
p->pid, p->comm);
}
task_lock(p);
if (p->files) {
- rcu_read_lock();
+ /*
+ * We don't take a ref to the file, so we must
+ * hold ->file_lock instead.
+ */
+ spin_lock(&p->files->file_lock);
fdt = files_fdtable(p->files);
for (i=0; i < fdt->max_fds; i++) {
filp = fcheck_files(p->files, i);
printk(KERN_NOTICE "SAK: killed process %d"
" (%s): fd#%d opened to the tty\n",
p->pid, p->comm, i);
- send_sig(SIGKILL, p, 1);
+ force_sig(SIGKILL, p);
break;
}
}
- rcu_read_unlock();
+ spin_unlock(&p->files->file_lock);
}
task_unlock(p);
- } while_each_task_pid(session, PIDTYPE_SID, p);
+ } while_each_thread(g, p);
read_unlock(&tasklist_lock);
#endif
}
struct tty_struct *tty = (struct tty_struct *) private_;
unsigned long flags;
struct tty_ldisc *disc;
- struct tty_buffer *tbuf;
+ struct tty_buffer *tbuf, *head;
+ char *char_buf;
+ unsigned char *flag_buf;
disc = tty_ldisc_ref(tty);
if (disc == NULL) /* !TTY_LDISC */
return;
- if (test_bit(TTY_DONT_FLIP, &tty->flags)) {
- /*
- * Do it after the next timer tick:
- */
- schedule_delayed_work(&tty->buf.work, 1);
- goto out;
+ spin_lock_irqsave(&tty->buf.lock, flags);
+ head = tty->buf.head;
+ if (head != NULL) {
+ tty->buf.head = NULL;
+ for (;;) {
+ int count = head->commit - head->read;
+ if (!count) {
+ if (head->next == NULL)
+ break;
+ tbuf = head;
+ head = head->next;
+ tty_buffer_free(tty, tbuf);
+ continue;
+ }
+ if (!tty->receive_room) {
+ schedule_delayed_work(&tty->buf.work, 1);
+ break;
+ }
+ if (count > tty->receive_room)
+ count = tty->receive_room;
+ char_buf = head->char_buf_ptr + head->read;
+ flag_buf = head->flag_buf_ptr + head->read;
+ head->read += count;
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
+ disc->receive_buf(tty, char_buf, flag_buf, count);
+ spin_lock_irqsave(&tty->buf.lock, flags);
+ }
+ tty->buf.head = head;
}
- spin_lock_irqsave(&tty->read_lock, flags);
- while((tbuf = tty->buf.head) != NULL) {
- tty->buf.head = tbuf->next;
- if (tty->buf.head == NULL)
- tty->buf.tail = NULL;
- spin_unlock_irqrestore(&tty->read_lock, flags);
- /* printk("Process buffer %p for %d\n", tbuf, tbuf->used); */
- disc->receive_buf(tty, tbuf->char_buf_ptr,
- tbuf->flag_buf_ptr,
- tbuf->used);
- spin_lock_irqsave(&tty->read_lock, flags);
- tty_buffer_free(tty, tbuf);
- }
- spin_unlock_irqrestore(&tty->read_lock, flags);
-out:
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
+
tty_ldisc_deref(disc);
}
void tty_flip_buffer_push(struct tty_struct *tty)
{
+ unsigned long flags;
+ spin_lock_irqsave(&tty->buf.lock, flags);
+ if (tty->buf.tail != NULL)
+ tty->buf.tail->commit = tty->buf.tail->used;
+ spin_unlock_irqrestore(&tty->buf.lock, flags);
+
if (tty->low_latency)
flush_to_ldisc((void *) tty);
else
init_waitqueue_head(&tty->write_wait);
init_waitqueue_head(&tty->read_wait);
INIT_WORK(&tty->hangup_work, do_tty_hangup, tty);
- sema_init(&tty->atomic_read, 1);
- sema_init(&tty->atomic_write, 1);
+ mutex_init(&tty->atomic_read_lock);
+ mutex_init(&tty->atomic_write_lock);
spin_lock_init(&tty->read_lock);
INIT_LIST_HEAD(&tty->tty_files);
INIT_WORK(&tty->SAK_work, NULL, NULL);
* This field is optional, if there is no known struct device for this
* tty device it can be set to NULL safely.
*
+ * Returns a pointer to the class device (or ERR_PTR(-EFOO) on error).
+ *
* This call is required to be made to register an individual tty device if
- * the tty driver's flags have the TTY_DRIVER_NO_DEVFS bit set. If that
- * bit is not set, this function should not be called.
+ * the tty driver's flags have the TTY_DRIVER_DYNAMIC_DEV bit set. If that
+ * bit is not set, this function should not be called by a tty driver.
*/
-void tty_register_device(struct tty_driver *driver, unsigned index,
- struct device *device)
+struct class_device *tty_register_device(struct tty_driver *driver,
+ unsigned index, struct device *device)
{
char name[64];
dev_t dev = MKDEV(driver->major, driver->minor_start) + index;
if (index >= driver->num) {
printk(KERN_ERR "Attempt to register invalid tty line number "
" (%d).\n", index);
- return;
+ return ERR_PTR(-EINVAL);
}
- devfs_mk_cdev(dev, S_IFCHR | S_IRUSR | S_IWUSR,
- "%s%d", driver->devfs_name, index + driver->name_base);
-
if (driver->type == TTY_DRIVER_TYPE_PTY)
pty_line_name(driver, index, name);
else
tty_line_name(driver, index, name);
- class_device_create(tty_class, NULL, dev, device, "%s", name);
+
+ return class_device_create(tty_class, NULL, dev, device, "%s", name);
}
/**
*/
void tty_unregister_device(struct tty_driver *driver, unsigned index)
{
- devfs_remove("%s%d", driver->devfs_name, index + driver->name_base);
class_device_destroy(tty_class, MKDEV(driver->major, driver->minor_start) + index);
}
list_add(&driver->tty_drivers, &tty_drivers);
- if ( !(driver->flags & TTY_DRIVER_NO_DEVFS) ) {
+ if ( !(driver->flags & TTY_DRIVER_DYNAMIC_DEV) ) {
for(i = 0; i < driver->num; i++)
tty_register_device(driver, i, NULL);
}
driver->termios_locked[i] = NULL;
kfree(tp);
}
- if (!(driver->flags & TTY_DRIVER_NO_DEVFS))
+ if (!(driver->flags & TTY_DRIVER_DYNAMIC_DEV))
tty_unregister_device(driver, i);
}
p = driver->ttys;
if (cdev_add(&tty_cdev, MKDEV(TTYAUX_MAJOR, 0), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 0), 1, "/dev/tty") < 0)
panic("Couldn't register /dev/tty driver\n");
- devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 0), S_IFCHR|S_IRUGO|S_IWUGO, "tty");
class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, "tty");
cdev_init(&console_cdev, &console_fops);
if (cdev_add(&console_cdev, MKDEV(TTYAUX_MAJOR, 1), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 1), 1, "/dev/console") < 0)
panic("Couldn't register /dev/console driver\n");
- devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 1), S_IFCHR|S_IRUSR|S_IWUSR, "console");
class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, "console");
#ifdef CONFIG_UNIX98_PTYS
if (cdev_add(&ptmx_cdev, MKDEV(TTYAUX_MAJOR, 2), 1) ||
register_chrdev_region(MKDEV(TTYAUX_MAJOR, 2), 1, "/dev/ptmx") < 0)
panic("Couldn't register /dev/ptmx driver\n");
- devfs_mk_cdev(MKDEV(TTYAUX_MAJOR, 2), S_IFCHR|S_IRUGO|S_IWUGO, "ptmx");
class_device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx");
#endif
if (cdev_add(&vc0_cdev, MKDEV(TTY_MAJOR, 0), 1) ||
register_chrdev_region(MKDEV(TTY_MAJOR, 0), 1, "/dev/vc/0") < 0)
panic("Couldn't register /dev/tty0 driver\n");
- devfs_mk_cdev(MKDEV(TTY_MAJOR, 0), S_IFCHR|S_IRUSR|S_IWUSR, "vc/0");
class_device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0");
vty_init();
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff