Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=e10cc1df1d2014f68a4bdcf73f6dd122c4561f94
Commit:     e10cc1df1d2014f68a4bdcf73f6dd122c4561f94
Parent:     108f39a1b3b1e4b28ca8cc156f06171445499d21
Author:     Paul Fulghum <[EMAIL PROTECTED]>
AuthorDate: Thu May 10 22:22:50 2007 -0700
Committer:  Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri May 11 08:29:35 2007 -0700

    tty: add compat_ioctl
    
    Add compat_ioctl method for tty code to allow processing of 32 bit ioctl
    calls on 64 bit systems by tty core, tty drivers, and line disciplines.
    
    Based on patch by Arnd Bergmann:
    http://www.uwsg.iu.edu/hypermail/linux/kernel/0511.0/1732.html
    
    [EMAIL PROTECTED]: make things static]
    Signed-off-by: Paul Fulghum <[EMAIL PROTECTED]>
    Acked-by: Arnd Bergmann <[EMAIL PROTECTED]>
    Cc: Alan Cox <[EMAIL PROTECTED]>
    Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
    Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
 drivers/char/n_tty.c       |   29 +++++++++++++----------------
 drivers/char/tty_io.c      |   43 ++++++++++++++++++++++++++++++++++++++++---
 include/linux/tty_driver.h |    9 +++++++++
 include/linux/tty_ldisc.h  |    7 +++++++
 4 files changed, 69 insertions(+), 19 deletions(-)

diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
index 6ac3ca4..b3d4ccc 100644
--- a/drivers/char/n_tty.c
+++ b/drivers/char/n_tty.c
@@ -1544,21 +1544,18 @@ static unsigned int normal_poll(struct tty_struct * 
tty, struct file * file, pol
 }
 
 struct tty_ldisc tty_ldisc_N_TTY = {
-       TTY_LDISC_MAGIC,        /* magic */
-       "n_tty",                /* name */
-       0,                      /* num */
-       0,                      /* flags */
-       n_tty_open,             /* open */
-       n_tty_close,            /* close */
-       n_tty_flush_buffer,     /* flush_buffer */
-       n_tty_chars_in_buffer,  /* chars_in_buffer */
-       read_chan,              /* read */
-       write_chan,             /* write */
-       n_tty_ioctl,            /* ioctl */
-       n_tty_set_termios,      /* set_termios */
-       normal_poll,            /* poll */
-       NULL,                   /* hangup */
-       n_tty_receive_buf,      /* receive_buf */
-       n_tty_write_wakeup      /* write_wakeup */
+       .magic           = TTY_LDISC_MAGIC,
+       .name            = "n_tty",
+       .open            = n_tty_open,
+       .close           = n_tty_close,
+       .flush_buffer    = n_tty_flush_buffer,
+       .chars_in_buffer = n_tty_chars_in_buffer,
+       .read            = read_chan,
+       .write           = write_chan,
+       .ioctl           = n_tty_ioctl,
+       .set_termios     = n_tty_set_termios,
+       .poll            = normal_poll,
+       .receive_buf     = n_tty_receive_buf,
+       .write_wakeup    = n_tty_write_wakeup
 };
 
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index fc662e4..fe62c21 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -151,6 +151,12 @@ static int tty_open(struct inode *, struct file *);
 static int tty_release(struct inode *, struct file *);
 int tty_ioctl(struct inode * inode, struct file * file,
              unsigned int cmd, unsigned long arg);
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+                               unsigned long arg);
+#else
+#define tty_compat_ioctl NULL
+#endif
 static int tty_fasync(int fd, struct file * filp, int on);
 static void release_tty(struct tty_struct *tty, int idx);
 static void __proc_set_tty(struct task_struct *tsk, struct tty_struct *tty);
@@ -1143,8 +1149,8 @@ static unsigned int hung_up_tty_poll(struct file * filp, 
poll_table * wait)
        return POLLIN | POLLOUT | POLLERR | POLLHUP | POLLRDNORM | POLLWRNORM;
 }
 
-static int hung_up_tty_ioctl(struct inode * inode, struct file * file,
-                            unsigned int cmd, unsigned long arg)
+static long hung_up_tty_ioctl(struct file * file,
+                             unsigned int cmd, unsigned long arg)
 {
        return cmd == TIOCSPGRP ? -ENOTTY : -EIO;
 }
@@ -1155,6 +1161,7 @@ static const struct file_operations tty_fops = {
        .write          = tty_write,
        .poll           = tty_poll,
        .ioctl          = tty_ioctl,
+       .compat_ioctl   = tty_compat_ioctl,
        .open           = tty_open,
        .release        = tty_release,
        .fasync         = tty_fasync,
@@ -1167,6 +1174,7 @@ static const struct file_operations ptmx_fops = {
        .write          = tty_write,
        .poll           = tty_poll,
        .ioctl          = tty_ioctl,
+       .compat_ioctl   = tty_compat_ioctl,
        .open           = ptmx_open,
        .release        = tty_release,
        .fasync         = tty_fasync,
@@ -1179,6 +1187,7 @@ static const struct file_operations console_fops = {
        .write          = redirected_tty_write,
        .poll           = tty_poll,
        .ioctl          = tty_ioctl,
+       .compat_ioctl   = tty_compat_ioctl,
        .open           = tty_open,
        .release        = tty_release,
        .fasync         = tty_fasync,
@@ -1189,7 +1198,8 @@ static const struct file_operations hung_up_tty_fops = {
        .read           = hung_up_tty_read,
        .write          = hung_up_tty_write,
        .poll           = hung_up_tty_poll,
-       .ioctl          = hung_up_tty_ioctl,
+       .unlocked_ioctl = hung_up_tty_ioctl,
+       .compat_ioctl   = hung_up_tty_ioctl,
        .release        = tty_release,
 };
 
@@ -3357,6 +3367,32 @@ int tty_ioctl(struct inode * inode, struct file * file,
        return retval;
 }
 
+#ifdef CONFIG_COMPAT
+static long tty_compat_ioctl(struct file * file, unsigned int cmd,
+                               unsigned long arg)
+{
+       struct inode *inode = file->f_dentry->d_inode;
+       struct tty_struct *tty = file->private_data;
+       struct tty_ldisc *ld;
+       int retval = -ENOIOCTLCMD;
+
+       if (tty_paranoia_check(tty, inode, "tty_ioctl"))
+               return -EINVAL;
+
+       if (tty->driver->compat_ioctl) {
+               retval = (tty->driver->compat_ioctl)(tty, file, cmd, arg);
+               if (retval != -ENOIOCTLCMD)
+                       return retval;
+       }
+
+       ld = tty_ldisc_ref_wait(tty);
+       if (ld->compat_ioctl)
+               retval = ld->compat_ioctl(tty, file, cmd, arg);
+       tty_ldisc_deref(ld);
+
+       return retval;
+}
+#endif
 
 /*
  * This implements the "Secure Attention Key" ---  the idea is to
@@ -3689,6 +3725,7 @@ void tty_set_operations(struct tty_driver *driver,
        driver->write_room = op->write_room;
        driver->chars_in_buffer = op->chars_in_buffer;
        driver->ioctl = op->ioctl;
+       driver->compat_ioctl = op->compat_ioctl;
        driver->set_termios = op->set_termios;
        driver->throttle = op->throttle;
        driver->unthrottle = op->unthrottle;
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h
index 659487e..85c95cd 100644
--- a/include/linux/tty_driver.h
+++ b/include/linux/tty_driver.h
@@ -52,6 +52,11 @@
  *     This routine allows the tty driver to implement
  *     device-specific ioctl's.  If the ioctl number passed in cmd
  *     is not recognized by the driver, it should return ENOIOCTLCMD.
+ *
+ * long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+ *                     unsigned int cmd, unsigned long arg);
+ *
+ *     implement ioctl processing for 32 bit process on 64 bit system
  * 
  * void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
  *
@@ -132,6 +137,8 @@ struct tty_operations {
        int  (*chars_in_buffer)(struct tty_struct *tty);
        int  (*ioctl)(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg);
+       long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+                            unsigned int cmd, unsigned long arg);
        void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
        void (*throttle)(struct tty_struct * tty);
        void (*unthrottle)(struct tty_struct * tty);
@@ -193,6 +200,8 @@ struct tty_driver {
        int  (*chars_in_buffer)(struct tty_struct *tty);
        int  (*ioctl)(struct tty_struct *tty, struct file * file,
                    unsigned int cmd, unsigned long arg);
+       long (*compat_ioctl)(struct tty_struct *tty, struct file * file,
+                            unsigned int cmd, unsigned long arg);
        void (*set_termios)(struct tty_struct *tty, struct ktermios * old);
        void (*throttle)(struct tty_struct * tty);
        void (*unthrottle)(struct tty_struct * tty);
diff --git a/include/linux/tty_ldisc.h b/include/linux/tty_ldisc.h
index d75932e..6226504 100644
--- a/include/linux/tty_ldisc.h
+++ b/include/linux/tty_ldisc.h
@@ -59,6 +59,11 @@
  *     low-level driver can "grab" an ioctl request before the line
  *     discpline has a chance to see it.
  * 
+ * long        (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+ *                     unsigned int cmd, unsigned long arg);
+ *
+ *      Process ioctl calls from 32-bit process on 64-bit system
+ *
  * void        (*set_termios)(struct tty_struct *tty, struct ktermios * old);
  *
  *     This function notifies the line discpline that a change has
@@ -118,6 +123,8 @@ struct tty_ldisc {
                         const unsigned char * buf, size_t nr); 
        int     (*ioctl)(struct tty_struct * tty, struct file * file,
                         unsigned int cmd, unsigned long arg);
+       long    (*compat_ioctl)(struct tty_struct * tty, struct file * file,
+                               unsigned int cmd, unsigned long arg);
        void    (*set_termios)(struct tty_struct *tty, struct ktermios * old);
        unsigned int (*poll)(struct tty_struct *, struct file *,
                             struct poll_table_struct *);
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