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Subject[PATCH] move common compat ioctls to hash
Hi!
The new ioctl code in fs/compat.c can be streamlined a little
using the compat hash instead of an explicit switch statement.

The attached patch is against 2.6.11-rc2-bk2.
Andi, could you please comment? Does this make sence?

Signed-off-by: Michael S. Tsirkin <mst@mellanox.co.il>

diff -rup linux-2.6.10/fs/compat.c linux-2.6.10-rc2-bk2/fs/compat.c
--- linux-2.6.10/fs/compat.c 2005-01-24 21:47:17.252499536 +0200
+++ linux-2.6.10-rc2-bk2/fs/compat.c 2005-01-24 22:06:00.254777240 +0200
@@ -439,37 +439,10 @@ asmlinkage long compat_sys_ioctl(unsigne
if (!filp)
goto out;

- /*
- * To allow the compat_ioctl handlers to be self contained
- * we need to check the common ioctls here first.
- * Just handle them with the standard handlers below.
- */
- switch (cmd) {
- case FIOCLEX:
- case FIONCLEX:
- case FIONBIO:
- case FIOASYNC:
- case FIOQSIZE:
- break;
-
- case FIBMAP:
- case FIGETBSZ:
- case FIONREAD:
- if (S_ISREG(filp->f_dentry->d_inode->i_mode))
- break;
- /*FALL THROUGH*/
-
- default:
- if (filp->f_op && filp->f_op->compat_ioctl) {
- error = filp->f_op->compat_ioctl(filp, cmd, arg);
- if (error != -ENOIOCTLCMD)
- goto out_fput;
- }
-
- if (!filp->f_op ||
- (!filp->f_op->ioctl && !filp->f_op->unlocked_ioctl))
- goto do_ioctl;
- break;
+ if (filp->f_op && filp->f_op->compat_ioctl) {
+ error = filp->f_op->compat_ioctl(filp, cmd, arg);
+ if (error != -ENOIOCTLCMD)
+ goto out_fput;
}

/* When register_ioctl32_conversion is finally gone remove
@@ -509,7 +482,7 @@ asmlinkage long compat_sys_ioctl(unsigne
}

up_read(&ioctl32_sem);
- do_ioctl:
+
error = sys_ioctl(fd, cmd, arg);
out_fput:
fput_light(filp, fput_needed);
diff -rup linux-2.6.10/fs/ioctl.c linux-2.6.10-rc2-bk2/fs/ioctl.c
--- linux-2.6.10/fs/ioctl.c 2005-01-24 21:47:17.400477040 +0200
+++ linux-2.6.10-rc2-bk2/fs/ioctl.c 2005-01-24 22:05:38.346107864 +0200
@@ -80,7 +80,7 @@ static int file_ioctl(struct file *filp,

/*
* When you add any new common ioctls to the switches above and below
- * please update compat_sys_ioctl() too.
+ * please update compat_ioctl.h too.
*/
asmlinkage long sys_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
{
diff -rup linux-2.6.10/include/linux/compat_ioctl.h linux-2.6.10-rc2-bk2/include/linux/compat_ioctl.h
--- linux-2.6.10/include/linux/compat_ioctl.h 2005-01-24 21:47:21.486855816 +0200
+++ linux-2.6.10-rc2-bk2/include/linux/compat_ioctl.h 2005-01-24 22:06:22.349418344 +0200
@@ -10,6 +10,15 @@
#define ULONG_IOCTL(cmd) HANDLE_IOCTL((cmd),(ioctl_trans_handler_t)sys_ioctl)
#endif

+/* Common stuff */
+HANDLE_IOCTL(FIOCLEX)
+HANDLE_IOCTL(FIONCLEX)
+HANDLE_IOCTL(FIONBIO)
+HANDLE_IOCTL(FIOASYNC)
+HANDLE_IOCTL(FIOQSIZE)
+HANDLE_IOCTL(FIBMAP)
+HANDLE_IOCTL(FIGETBSZ)
+HANDLE_IOCTL(FIONREAD)
/* Big T */
COMPATIBLE_IOCTL(TCGETA)
COMPATIBLE_IOCTL(TCSETA)

--
I dont speak for Mellanox.
-
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