diff options
Diffstat (limited to 'drivers/char')
| -rw-r--r-- | drivers/char/pty.c | 78 | ||||
| -rw-r--r-- | drivers/char/tty_io.c | 169 | ||||
| -rw-r--r-- | drivers/char/tty_ioctl.c | 66 | ||||
| -rw-r--r-- | drivers/char/vt.c | 30 |
4 files changed, 188 insertions, 155 deletions
diff --git a/drivers/char/pty.c b/drivers/char/pty.c index ec09c1c..328e8ac 100644 --- a/drivers/char/pty.c +++ b/drivers/char/pty.c @@ -23,6 +23,7 @@ #include <linux/mm.h> #include <linux/init.h> #include <linux/sysctl.h> +#include <linux/device.h> #include <asm/uaccess.h> #include <asm/system.h> @@ -332,6 +333,8 @@ int pty_limit = NR_UNIX98_PTY_DEFAULT; static int pty_limit_min = 0; static int pty_limit_max = NR_UNIX98_PTY_MAX; +static struct cdev ptmx_cdev; + static struct ctl_table pty_table[] = { { .ctl_name = PTY_MAX, @@ -408,6 +411,70 @@ static const struct tty_operations ptm_unix98_ops = { .shutdown = pty_shutdown }; + +/** + * ptmx_open - open a unix 98 pty master + * @inode: inode of device file + * @filp: file pointer to tty + * + * Allocate a unix98 pty master device from the ptmx driver. + * + * Locking: tty_mutex protects the init_dev work. tty->count should + * protect the rest. + * allocated_ptys_lock handles the list of free pty numbers + */ + +static int __ptmx_open(struct inode *inode, struct file *filp) +{ + struct tty_struct *tty; + int retval; + int index; + + nonseekable_open(inode, filp); + + /* find a device that is not in use. */ + index = devpts_new_index(); + if (index < 0) + return index; + + mutex_lock(&tty_mutex); + retval = tty_init_dev(ptm_driver, index, &tty, 1); + mutex_unlock(&tty_mutex); + + if (retval) + goto out; + + set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ + filp->private_data = tty; + file_move(filp, &tty->tty_files); + + retval = devpts_pty_new(tty->link); + if (retval) + goto out1; + + retval = ptm_driver->ops->open(tty, filp); + if (!retval) + return 0; +out1: + tty_release_dev(filp); + return retval; +out: + devpts_kill_index(index); + return retval; +} + +static int ptmx_open(struct inode *inode, struct file *filp) +{ + int ret; + + lock_kernel(); + ret = __ptmx_open(inode, filp); + unlock_kernel(); + return ret; +} + +static struct file_operations ptmx_fops; + static void __init unix98_pty_init(void) { ptm_driver = alloc_tty_driver(NR_UNIX98_PTY_MAX); @@ -459,7 +526,18 @@ static void __init unix98_pty_init(void) pty_table[1].data = &ptm_driver->refcount; register_sysctl_table(pty_root_table); + + /* Now create the /dev/ptmx special device */ + tty_default_fops(&ptmx_fops); + ptmx_fops.open = ptmx_open; + + cdev_init(&ptmx_cdev, &ptmx_fops); + 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"); + device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); } + #else static inline void unix98_pty_init(void) { } #endif diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c index f91704d..fdcc43c 100644 --- a/drivers/char/tty_io.c +++ b/drivers/char/tty_io.c @@ -49,7 +49,7 @@ * implement CONFIG_VT and generalize console device interface. * -- Marko Kohtala <Marko.Kohtala@hut.fi>, March 97 * - * Rewrote init_dev and release_dev to eliminate races. + * Rewrote tty_init_dev and tty_release_dev to eliminate races. * -- Bill Hawes <whawes@star.net>, June 97 * * Added devfs support. @@ -136,11 +136,6 @@ LIST_HEAD(tty_drivers); /* linked list of tty drivers */ DEFINE_MUTEX(tty_mutex); EXPORT_SYMBOL(tty_mutex); -#ifdef CONFIG_UNIX98_PTYS -extern struct tty_driver *ptm_driver; /* Unix98 pty masters; for /dev/ptmx */ -static int ptmx_open(struct inode *, struct file *); -#endif - static void initialize_tty_struct(struct tty_struct *tty); static ssize_t tty_read(struct file *, char __user *, size_t, loff_t *); @@ -425,20 +420,6 @@ static const struct file_operations tty_fops = { .fasync = tty_fasync, }; -#ifdef CONFIG_UNIX98_PTYS -static const struct file_operations ptmx_fops = { - .llseek = no_llseek, - .read = tty_read, - .write = tty_write, - .poll = tty_poll, - .unlocked_ioctl = tty_ioctl, - .compat_ioctl = tty_compat_ioctl, - .open = ptmx_open, - .release = tty_release, - .fasync = tty_fasync, -}; -#endif - static const struct file_operations console_fops = { .llseek = no_llseek, .read = tty_read, @@ -1224,7 +1205,7 @@ static void tty_line_name(struct tty_driver *driver, int index, char *p) } /** - * init_dev - initialise a tty device + * tty_init_dev - initialise a tty device * @driver: tty driver we are opening a device on * @idx: device index * @ret_tty: returned tty structure @@ -1248,7 +1229,7 @@ static void tty_line_name(struct tty_driver *driver, int index, char *p) * relaxed for the (most common) case of reopening a tty. */ -static int init_dev(struct tty_driver *driver, int idx, +int tty_init_dev(struct tty_driver *driver, int idx, struct tty_struct **ret_tty, int first_ok) { struct tty_struct *tty, *o_tty; @@ -1269,8 +1250,8 @@ static int init_dev(struct tty_driver *driver, int idx, goto end_init; } /* - * It's safe from now on because init_dev() is called with - * tty_mutex held and release_dev() won't change tty->count + * It's safe from now on because tty_init_dev() is called with + * tty_mutex held and tty_release_dev() won't change tty->count * or tty->flags without having to grab tty_mutex */ if (tty && driver->subtype == PTY_TYPE_MASTER) @@ -1449,7 +1430,7 @@ fast_track: /* FIXME */ if (!test_bit(TTY_LDISC, &tty->flags)) - printk(KERN_ERR "init_dev but no ldisc\n"); + printk(KERN_ERR "tty_init_dev but no ldisc\n"); success: *ret_tty = tty; @@ -1476,7 +1457,7 @@ fail_no_mem: /* call the tty release_tty routine to clean out this slot */ release_mem_out: if (printk_ratelimit()) - printk(KERN_INFO "init_dev: ldisc open failed, " + printk(KERN_INFO "tty_init_dev: ldisc open failed, " "clearing slot %d\n", idx); release_tty(tty, idx); goto end_init; @@ -1587,7 +1568,7 @@ static void release_tty(struct tty_struct *tty, int idx) * WSH 09/09/97: rewritten to avoid some nasty race conditions that could * lead to double frees or releasing memory still in use. */ -static void release_dev(struct file *filp) +void tty_release_dev(struct file *filp) { struct tty_struct *tty, *o_tty; int pty_master, tty_closing, o_tty_closing, do_sleep; @@ -1597,10 +1578,10 @@ static void release_dev(struct file *filp) tty = (struct tty_struct *)filp->private_data; if (tty_paranoia_check(tty, filp->f_path.dentry->d_inode, - "release_dev")) + "tty_release_dev")) return; - check_tty_count(tty, "release_dev"); + check_tty_count(tty, "tty_release_dev"); tty_fasync(-1, filp, 0); @@ -1612,24 +1593,24 @@ static void release_dev(struct file *filp) #ifdef TTY_PARANOIA_CHECK if (idx < 0 || idx >= tty->driver->num) { - printk(KERN_DEBUG "release_dev: bad idx when trying to " + printk(KERN_DEBUG "tty_release_dev: bad idx when trying to " "free (%s)\n", tty->name); return; } if (!(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) { if (tty != tty->driver->ttys[idx]) { - printk(KERN_DEBUG "release_dev: driver.table[%d] not tty " + printk(KERN_DEBUG "tty_release_dev: driver.table[%d] not tty " "for (%s)\n", idx, tty->name); return; } if (tty->termios != tty->driver->termios[idx]) { - printk(KERN_DEBUG "release_dev: driver.termios[%d] not termios " + printk(KERN_DEBUG "tty_release_dev: driver.termios[%d] not termios " "for (%s)\n", idx, tty->name); return; } if (tty->termios_locked != tty->driver->termios_locked[idx]) { - printk(KERN_DEBUG "release_dev: driver.termios_locked[%d] not " + printk(KERN_DEBUG "tty_release_dev: driver.termios_locked[%d] not " "termios_locked for (%s)\n", idx, tty->name); return; @@ -1638,7 +1619,7 @@ static void release_dev(struct file *filp) #endif #ifdef TTY_DEBUG_HANGUP - printk(KERN_DEBUG "release_dev of %s (tty count=%d)...", + printk(KERN_DEBUG "tty_release_dev of %s (tty count=%d)...", tty_name(tty, buf), tty->count); #endif @@ -1646,26 +1627,26 @@ static void release_dev(struct file *filp) if (tty->driver->other && !(tty->driver->flags & TTY_DRIVER_DEVPTS_MEM)) { if (o_tty != tty->driver->other->ttys[idx]) { - printk(KERN_DEBUG "release_dev: other->table[%d] " + printk(KERN_DEBUG "tty_release_dev: other->table[%d] " "not o_tty for (%s)\n", idx, tty->name); return; } if (o_tty->termios != tty->driver->other->termios[idx]) { - printk(KERN_DEBUG "release_dev: other->termios[%d] " + printk(KERN_DEBUG "tty_release_dev: other->termios[%d] " "not o_termios for (%s)\n", idx, tty->name); return; } if (o_tty->termios_locked != tty->driver->other->termios_locked[idx]) { - printk(KERN_DEBUG "release_dev: other->termios_locked[" + printk(KERN_DEBUG "tty_release_dev: other->termios_locked[" "%d] not o_termios_locked for (%s)\n", idx, tty->name); return; } if (o_tty->link != tty) { - printk(KERN_DEBUG "release_dev: bad pty pointers\n"); + printk(KERN_DEBUG "tty_release_dev: bad pty pointers\n"); return; } } @@ -1723,7 +1704,7 @@ static void release_dev(struct file *filp) if (!do_sleep) break; - printk(KERN_WARNING "release_dev: %s: read/write wait queue " + printk(KERN_WARNING "tty_release_dev: %s: read/write wait queue " "active!\n", tty_name(tty, buf)); mutex_unlock(&tty_mutex); schedule(); @@ -1736,14 +1717,14 @@ static void release_dev(struct file *filp) */ if (pty_master) { if (--o_tty->count < 0) { - printk(KERN_WARNING "release_dev: bad pty slave count " + printk(KERN_WARNING "tty_release_dev: bad pty slave count " "(%d) for %s\n", o_tty->count, tty_name(o_tty, buf)); o_tty->count = 0; } } if (--tty->count < 0) { - printk(KERN_WARNING "release_dev: bad tty->count (%d) for %s\n", + printk(KERN_WARNING "tty_release_dev: bad tty->count (%d) for %s\n", tty->count, tty_name(tty, buf)); tty->count = 0; } @@ -1825,7 +1806,7 @@ static void release_dev(struct file *filp) * The termios state of a pty is reset on first open so that * settings don't persist across reuse. * - * Locking: tty_mutex protects tty, get_tty_driver and init_dev work. + * Locking: tty_mutex protects tty, get_tty_driver and tty_init_dev work. * tty->count should protect the rest. * ->siglock protects ->signal/->sighand */ @@ -1889,7 +1870,7 @@ retry_open: return -ENODEV; } got_driver: - retval = init_dev(driver, index, &tty, 0); + retval = tty_init_dev(driver, index, &tty, 0); mutex_unlock(&tty_mutex); if (retval) return retval; @@ -1920,7 +1901,7 @@ got_driver: printk(KERN_DEBUG "error %d in opening %s...", retval, tty->name); #endif - release_dev(filp); + tty_release_dev(filp); if (retval != -ERESTARTSYS) return retval; if (signal_pending(current)) @@ -1959,69 +1940,6 @@ static int tty_open(struct inode *inode, struct file *filp) -#ifdef CONFIG_UNIX98_PTYS -/** - * ptmx_open - open a unix 98 pty master - * @inode: inode of device file - * @filp: file pointer to tty - * - * Allocate a unix98 pty master device from the ptmx driver. - * - * Locking: tty_mutex protects theinit_dev work. tty->count should - * protect the rest. - * allocated_ptys_lock handles the list of free pty numbers - */ - -static int __ptmx_open(struct inode *inode, struct file *filp) -{ - struct tty_struct *tty; - int retval; - int index; - - nonseekable_open(inode, filp); - - /* find a device that is not in use. */ - index = devpts_new_index(); - if (index < 0) - return index; - - mutex_lock(&tty_mutex); - retval = init_dev(ptm_driver, index, &tty, 1); - mutex_unlock(&tty_mutex); - - if (retval) - goto out; - - set_bit(TTY_PTY_LOCK, &tty->flags); /* LOCK THE SLAVE */ - filp->private_data = tty; - file_move(filp, &tty->tty_files); - - retval = devpts_pty_new(tty->link); - if (retval) - goto out1; - - check_tty_count(tty, "ptmx_open"); - retval = ptm_driver->ops->open(tty, filp); - if (!retval) - return 0; -out1: - release_dev(filp); - return retval; -out: - devpts_kill_index(index); - return retval; -} - -static int ptmx_open(struct inode *inode, struct file *filp) -{ - int ret; - - lock_kernel(); - ret = __ptmx_open(inode, filp); - unlock_kernel(); - return ret; -} -#endif /** * tty_release - vfs callback for close @@ -2032,13 +1950,13 @@ static int ptmx_open(struct inode *inode, struct file *filp) * this tty. There may however be several such references. * * Locking: - * Takes bkl. See release_dev + * Takes bkl. See tty_release_dev */ static int tty_release(struct inode *inode, struct file *filp) { lock_kernel(); - release_dev(filp); + tty_release_dev(filp); unlock_kernel(); return 0; } @@ -2932,7 +2850,7 @@ int tty_put_char(struct tty_struct *tty, unsigned char ch) EXPORT_SYMBOL_GPL(tty_put_char); -static struct class *tty_class; +struct class *tty_class; /** * tty_register_device - register a tty device @@ -3197,6 +3115,11 @@ struct tty_struct *get_current_tty(void) } EXPORT_SYMBOL_GPL(get_current_tty); +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. @@ -3234,12 +3157,6 @@ postcore_initcall(tty_class_init); /* 3/2004 jmc: why do these devices exist? */ static struct cdev tty_cdev, console_cdev; -#ifdef CONFIG_UNIX98_PTYS -static struct cdev ptmx_cdev; -#endif -#ifdef CONFIG_VT -static struct cdev vc0_cdev; -#endif /* * Ok, now we can initialize the rest of the tty devices and can count @@ -3251,32 +3168,18 @@ static int __init tty_init(void) 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"); - device_create_drvdata(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 0), NULL, + 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"); - device_create_drvdata(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, + device_create(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 1), NULL, "console"); -#ifdef CONFIG_UNIX98_PTYS - cdev_init(&ptmx_cdev, &ptmx_fops); - 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"); - device_create_drvdata(tty_class, NULL, MKDEV(TTYAUX_MAJOR, 2), NULL, "ptmx"); -#endif - #ifdef CONFIG_VT - cdev_init(&vc0_cdev, &console_fops); - 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"); - device_create_drvdata(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); - - vty_init(); + vty_init(&console_fops); #endif return 0; } diff --git a/drivers/char/tty_ioctl.c b/drivers/char/tty_ioctl.c index 30670851..14cc19c 100644 --- a/drivers/char/tty_ioctl.c +++ b/drivers/char/tty_ioctl.c @@ -40,6 +40,15 @@ #define TERMIOS_OLD 8 +/** + * tty_chars_in_buffer - characters pending + * @tty: terminal + * + * Return the number of bytes of data in the device private + * output queue. If no private method is supplied there is assumed + * to be no queue on the device. + */ + int tty_chars_in_buffer(struct tty_struct *tty) { if (tty->ops->chars_in_buffer) @@ -47,26 +56,49 @@ int tty_chars_in_buffer(struct tty_struct *tty) else return 0; } - EXPORT_SYMBOL(tty_chars_in_buffer); +/** + * tty_write_room - write queue space + * @tty: terminal + * + * Return the number of bytes that can be queued to this device + * at the present time. The result should be treated as a guarantee + * and the driver cannot offer a value it later shrinks by more than + * the number of bytes written. If no method is provided 2K is always + * returned and data may be lost as there will be no flow control. + */ + int tty_write_room(struct tty_struct *tty) { if (tty->ops->write_room) return tty->ops->write_room(tty); return 2048; } - EXPORT_SYMBOL(tty_write_room); +/** + * tty_driver_flush_buffer - discard internal buffer + * @tty: terminal + * + * Discard the internal output buffer for this device. If no method + * is provided then either the buffer cannot be hardware flushed or + * there is no buffer driver side. + */ void tty_driver_flush_buffer(struct tty_struct *tty) { if (tty->ops->flush_buffer) tty->ops->flush_buffer(tty); } - EXPORT_SYMBOL(tty_driver_flush_buffer); +/** + * tty_throttle - flow control + * @tty: terminal + * + * Indicate that a tty should stop transmitting data down the stack. + */ + void tty_throttle(struct tty_struct *tty) { /* check TTY_THROTTLED first so it indicates our state */ @@ -76,6 +108,13 @@ void tty_throttle(struct tty_struct *tty) } EXPORT_SYMBOL(tty_throttle); +/** + * tty_unthrottle - flow control + * @tty: terminal + * + * Indicate that a tty may continue transmitting data down the stack. + */ + void tty_unthrottle(struct tty_struct *tty) { if (test_and_clear_bit(TTY_THROTTLED, &tty->flags) && @@ -112,6 +151,11 @@ void tty_wait_until_sent(struct tty_struct *tty, long timeout) } EXPORT_SYMBOL(tty_wait_until_sent); + +/* + * Termios Helper Methods + */ + static void unset_locked_termios(struct ktermios *termios, struct ktermios *old, struct ktermios *locked) @@ -346,6 +390,16 @@ void tty_termios_encode_baud_rate(struct ktermios *termios, } 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_mutex 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); @@ -430,7 +484,7 @@ EXPORT_SYMBOL(tty_termios_hw_change); * is a bit of layering violation here with n_tty in terms of the * internal knowledge of this function. * - * Locking: termios_sem + * Locking: termios_mutex */ static void change_termios(struct tty_struct *tty, struct ktermios *new_termios) @@ -508,7 +562,7 @@ static void change_termios(struct tty_struct *tty, struct ktermios *new_termios) * functions before using change_termios to do the actual changes. * * Locking: - * Called functions take ldisc and termios_sem locks + * Called functions take ldisc and termios_mutex locks */ static int set_termios(struct tty_struct *tty, void __user *arg, int opt) @@ -715,7 +769,7 @@ static void set_sgflags(struct ktermios *termios, int flags) * Updates a terminal from the legacy BSD style terminal information * structure. * - * Locking: termios_sem + * Locking: termios_mutex */ static int set_sgttyb(struct tty_struct *tty, struct sgttyb __user *sgttyb) diff --git a/drivers/char/vt.c b/drivers/char/vt.c index 37a45db..57029fe 100644 --- a/drivers/char/vt.c +++ b/drivers/char/vt.c @@ -100,10 +100,10 @@ #include <linux/font.h> #include <linux/bitops.h> #include <linux/notifier.h> - -#include <asm/io.h> +#include <linux/device.h> +#include <linux/io.h> #include <asm/system.h> -#include <asm/uaccess.h> +#include <linux/uaccess.h> #define MAX_NR_CON_DRIVER 16 @@ -2352,8 +2352,6 @@ rescan_last_byte: FLUSH console_conditional_schedule(); release_console_sem(); - -out: notify_update(vc); return n; #undef FLUSH @@ -2784,13 +2782,6 @@ static int con_open(struct tty_struct *tty, struct file *filp) return ret; } -/* - * We take tty_mutex in here to prevent another thread from coming in via init_dev - * and taking a ref against the tty while we're in the process of forgetting - * about it and cleaning things up. - * - * This is because vcs_remove_sysfs() can sleep and will drop the BKL. - */ static void con_close(struct tty_struct *tty, struct file *filp) { /* Nothing to do - we defer to shutdown */ @@ -2932,8 +2923,16 @@ static const struct tty_operations con_ops = { .shutdown = con_shutdown }; -int __init vty_init(void) +static struct cdev vc0_cdev; + +int __init vty_init(const struct file_operations *console_fops) { + cdev_init(&vc0_cdev, console_fops); + 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"); + device_create(tty_class, NULL, MKDEV(TTY_MAJOR, 0), NULL, "tty0"); + vcs_init(); console_driver = alloc_tty_driver(MAX_NR_CONSOLES); @@ -2952,7 +2951,6 @@ int __init vty_init(void) tty_set_operations(console_driver, &con_ops); if (tty_register_driver(console_driver)) panic("Couldn't register console driver\n"); - kbd_init(); console_map_init(); #ifdef CONFIG_PROM_CONSOLE @@ -3446,7 +3444,7 @@ int register_con_driver(const struct consw *csw, int first, int last) if (retval) goto err; - con_driver->dev = device_create_drvdata(vtconsole_class, NULL, + con_driver->dev = device_create(vtconsole_class, NULL, MKDEV(0, con_driver->node), NULL, "vtcon%i", con_driver->node); @@ -3557,7 +3555,7 @@ static int __init vtconsole_class_init(void) struct con_driver *con = ®istered_con_driver[i]; if (con->con && !con->dev) { - con->dev = device_create_drvdata(vtconsole_class, NULL, + con->dev = device_create(vtconsole_class, NULL, MKDEV(0, con->node), NULL, "vtcon%i", con->node); |
