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Message-Id: <1258301050-26900-3-git-send-email-arnd@arndb.de>
Date: Sun, 15 Nov 2009 16:04:08 +0000
From: Arnd Bergmann <arnd@...db.de>
To: linux-kernel@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
Subject: [RFC 2/4] compat_ioctl: simplify calling of handlers
The compat_ioctl array now contains only entries for ioctl numbers
that do not require a separate handler. By special-casing the
ULONG_IOCTL case in the do_ioctl_trans function, we can kill the
final use of a function pointer in the array.
text data bss dec hex filename
7539 13352 2080 22971 59bb before/fs/compat_ioctl.o
7910 8552 2080 18542 486e after/fs/compat_ioctl.o
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
fs/compat_ioctl.c | 86 ++++++++++++++++++++++++-----------------------------
1 files changed, 39 insertions(+), 47 deletions(-)
diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index 4fa5313..d8039c3 100644
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -115,12 +115,6 @@
#include <asm/fbio.h>
#endif
-static int do_ioctl32_pointer(unsigned int fd, unsigned int cmd,
- unsigned long arg, struct file *f)
-{
- return sys_ioctl(fd, cmd, (unsigned long)compat_ptr(arg));
-}
-
static int w_long(unsigned int fd, unsigned int cmd, unsigned long arg)
{
mm_segment_t old_fs = get_fs();
@@ -1055,25 +1049,13 @@ static int compat_ioctl_preallocate(struct file *file, unsigned long arg)
#endif
-typedef int (*ioctl_trans_handler_t)(unsigned int, unsigned int,
- unsigned long, struct file *);
-
struct ioctl_trans {
unsigned long cmd;
- ioctl_trans_handler_t handler;
struct ioctl_trans *next;
};
-#define HANDLE_IOCTL(cmd,handler) \
- { (cmd), (ioctl_trans_handler_t)(handler) },
-
/* pointer to compatible structure or no argument */
-#define COMPATIBLE_IOCTL(cmd) \
- { (cmd), do_ioctl32_pointer },
-
-/* argument is an unsigned long integer, not a pointer */
-#define ULONG_IOCTL(cmd) \
- { (cmd), (ioctl_trans_handler_t)sys_ioctl },
+#define COMPATIBLE_IOCTL(cmd) { (cmd), },
/* ioctl should not be warned about even if it's not implemented.
Valid reasons to use this:
@@ -1095,7 +1077,6 @@ COMPATIBLE_IOCTL(TCSETA)
COMPATIBLE_IOCTL(TCSETAW)
COMPATIBLE_IOCTL(TCSETAF)
COMPATIBLE_IOCTL(TCSBRK)
-ULONG_IOCTL(TCSBRKP)
COMPATIBLE_IOCTL(TCXONC)
COMPATIBLE_IOCTL(TCFLSH)
COMPATIBLE_IOCTL(TCGETS)
@@ -1105,7 +1086,6 @@ COMPATIBLE_IOCTL(TCSETSF)
COMPATIBLE_IOCTL(TIOCLINUX)
COMPATIBLE_IOCTL(TIOCSBRK)
COMPATIBLE_IOCTL(TIOCCBRK)
-ULONG_IOCTL(TIOCMIWAIT)
COMPATIBLE_IOCTL(TIOCGICOUNT)
/* Little t */
COMPATIBLE_IOCTL(TIOCGETD)
@@ -1127,7 +1107,6 @@ COMPATIBLE_IOCTL(TIOCSTI)
COMPATIBLE_IOCTL(TIOCOUTQ)
COMPATIBLE_IOCTL(TIOCSPGRP)
COMPATIBLE_IOCTL(TIOCGPGRP)
-ULONG_IOCTL(TIOCSCTTY)
COMPATIBLE_IOCTL(TIOCGPTN)
COMPATIBLE_IOCTL(TIOCSPTLCK)
COMPATIBLE_IOCTL(TIOCSERGETLSR)
@@ -1158,32 +1137,21 @@ COMPATIBLE_IOCTL(PRINT_RAID_DEBUG)
COMPATIBLE_IOCTL(RAID_AUTORUN)
COMPATIBLE_IOCTL(CLEAR_ARRAY)
COMPATIBLE_IOCTL(ADD_NEW_DISK)
-ULONG_IOCTL(HOT_REMOVE_DISK)
COMPATIBLE_IOCTL(SET_ARRAY_INFO)
COMPATIBLE_IOCTL(SET_DISK_INFO)
COMPATIBLE_IOCTL(WRITE_RAID_INFO)
COMPATIBLE_IOCTL(UNPROTECT_ARRAY)
COMPATIBLE_IOCTL(PROTECT_ARRAY)
-ULONG_IOCTL(HOT_ADD_DISK)
-ULONG_IOCTL(SET_DISK_FAULTY)
COMPATIBLE_IOCTL(RUN_ARRAY)
COMPATIBLE_IOCTL(STOP_ARRAY)
COMPATIBLE_IOCTL(STOP_ARRAY_RO)
COMPATIBLE_IOCTL(RESTART_ARRAY_RW)
COMPATIBLE_IOCTL(GET_BITMAP_FILE)
-ULONG_IOCTL(SET_BITMAP_FILE)
-/* Keyboard -- can be removed once tty3270 uses ops->compat_ioctl */
-ULONG_IOCTL(KDSIGACCEPT)
COMPATIBLE_IOCTL(KDGETKEYCODE)
COMPATIBLE_IOCTL(KDSETKEYCODE)
-ULONG_IOCTL(KIOCSOUND)
-ULONG_IOCTL(KDMKTONE)
COMPATIBLE_IOCTL(KDGKBTYPE)
-ULONG_IOCTL(KDSETMODE)
COMPATIBLE_IOCTL(KDGETMODE)
-ULONG_IOCTL(KDSKBMODE)
COMPATIBLE_IOCTL(KDGKBMODE)
-ULONG_IOCTL(KDSKBMETA)
COMPATIBLE_IOCTL(KDGKBMETA)
COMPATIBLE_IOCTL(KDGKBENT)
COMPATIBLE_IOCTL(KDSKBENT)
@@ -1193,9 +1161,7 @@ COMPATIBLE_IOCTL(KDGKBDIACR)
COMPATIBLE_IOCTL(KDSKBDIACR)
COMPATIBLE_IOCTL(KDKBDREP)
COMPATIBLE_IOCTL(KDGKBLED)
-ULONG_IOCTL(KDSKBLED)
COMPATIBLE_IOCTL(KDGETLED)
-ULONG_IOCTL(KDSETLED)
#ifdef CONFIG_BLOCK
/* Big S */
COMPATIBLE_IOCTL(SCSI_IOCTL_GET_IDLUN)
@@ -1241,7 +1207,6 @@ IGNORE_IOCTL(LOOP_CLR_FD)
COMPATIBLE_IOCTL(SG_SET_TIMEOUT)
COMPATIBLE_IOCTL(SG_GET_TIMEOUT)
COMPATIBLE_IOCTL(SG_EMULATED_HOST)
-ULONG_IOCTL(SG_SET_TRANSFORM)
COMPATIBLE_IOCTL(SG_GET_TRANSFORM)
COMPATIBLE_IOCTL(SG_SET_RESERVED_SIZE)
COMPATIBLE_IOCTL(SG_GET_RESERVED_SIZE)
@@ -1478,8 +1443,6 @@ COMPATIBLE_IOCTL(SOUND_MIXER_GETLEVELS)
COMPATIBLE_IOCTL(SOUND_MIXER_SETLEVELS)
COMPATIBLE_IOCTL(OSS_GETVERSION)
/* AUTOFS */
-ULONG_IOCTL(AUTOFS_IOC_READY)
-ULONG_IOCTL(AUTOFS_IOC_FAIL)
COMPATIBLE_IOCTL(AUTOFS_IOC_CATATONIC)
COMPATIBLE_IOCTL(AUTOFS_IOC_PROTOVER)
COMPATIBLE_IOCTL(AUTOFS_IOC_EXPIRE)
@@ -1588,14 +1551,10 @@ COMPATIBLE_IOCTL(USBDEVFS_REAPURB32)
COMPATIBLE_IOCTL(USBDEVFS_REAPURBNDELAY32)
COMPATIBLE_IOCTL(USBDEVFS_CLEAR_HALT)
/* NBD */
-ULONG_IOCTL(NBD_SET_SOCK)
-ULONG_IOCTL(NBD_SET_BLKSIZE)
-ULONG_IOCTL(NBD_SET_SIZE)
COMPATIBLE_IOCTL(NBD_DO_IT)
COMPATIBLE_IOCTL(NBD_CLEAR_SOCK)
COMPATIBLE_IOCTL(NBD_CLEAR_QUE)
COMPATIBLE_IOCTL(NBD_PRINT_DEBUG)
-ULONG_IOCTL(NBD_SET_SIZE_BLOCKS)
COMPATIBLE_IOCTL(NBD_DISCONNECT)
/* i2c */
COMPATIBLE_IOCTL(I2C_SLAVE)
@@ -1833,6 +1792,43 @@ static long do_ioctl_trans(int fd, unsigned int cmd,
case LPSETTIMEOUT:
return lp_timeout_trans(fd, cmd, arg);
}
+
+ /*
+ * These take an integer instead of a pointer as 'arg',
+ * so we must not do a compat_ptr() translation.
+ */
+ switch (cmd) {
+ /* Big T */
+ case TCSBRKP:
+ case TIOCMIWAIT:
+ case TIOCSCTTY:
+ /* RAID */
+ case HOT_REMOVE_DISK:
+ case HOT_ADD_DISK:
+ case SET_DISK_FAULTY:
+ case SET_BITMAP_FILE:
+ /* Big K */
+ case KDSIGACCEPT:
+ case KIOCSOUND:
+ case KDMKTONE:
+ case KDSETMODE:
+ case KDSKBMODE:
+ case KDSKBMETA:
+ case KDSKBLED:
+ case KDSETLED:
+ /* SG stuff */
+ case SG_SET_TRANSFORM:
+ /* AUTOFS */
+ case AUTOFS_IOC_READY:
+ case AUTOFS_IOC_FAIL:
+ /* NBD */
+ case NBD_SET_SOCK:
+ case NBD_SET_BLKSIZE:
+ case NBD_SET_SIZE:
+ case NBD_SET_SIZE_BLOCKS:
+ return do_vfs_ioctl(file, fd, cmd, arg);
+ }
+
return -ENOIOCTLCMD;
}
@@ -1944,11 +1940,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
goto out_fput;
found_handler:
- if (t->handler) {
- error = t->handler(fd, cmd, arg, filp);
- goto out_fput;
- }
-
+ arg = (unsigned long)compat_ptr(arg);
do_ioctl:
error = do_vfs_ioctl(filp, fd, cmd, arg);
out_fput:
--
1.6.3.3
--
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