compat_ioctl: pass compat pointer directly to handlers

Instead of having each handler call compat_ptr, we can now
convert the pointer once and pass that to each handler.
This saves a little bit of both source and object code size.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>

diff --git a/fs/compat_ioctl.c b/fs/compat_ioctl.c
index b4873ae..ae1f1e6 100644 (file)
--- a/fs/compat_ioctl.c
+++ b/fs/compat_ioctl.c
@@ -117,33 +117,34 @@
 #include <asm/fbio.h>
 #endif
 
-static int w_long(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int w_long(unsigned int fd, unsigned int cmd,
+               compat_ulong_t __user *argp)
 {
        mm_segment_t old_fs = get_fs();
        int err;
        unsigned long val;
-       
+
        set_fs (KERNEL_DS);
        err = sys_ioctl(fd, cmd, (unsigned long)&val);
        set_fs (old_fs);
-       if (!err && put_user(val, (u32 __user *)compat_ptr(arg)))
+       if (!err && put_user(val, argp))
                return -EFAULT;
        return err;
 }
- 
-static int rw_long(unsigned int fd, unsigned int cmd, unsigned long arg)
+
+static int rw_long(unsigned int fd, unsigned int cmd,
+               compat_ulong_t __user *argp)
 {
        mm_segment_t old_fs = get_fs();
-       u32 __user *argptr = compat_ptr(arg);
        int err;
        unsigned long val;
-       
-       if(get_user(val, argptr))
+
+       if(get_user(val, argp))
                return -EFAULT;
        set_fs (KERNEL_DS);
        err = sys_ioctl(fd, cmd, (unsigned long)&val);
        set_fs (old_fs);
-       if (!err && put_user(val, argptr))
+       if (!err && put_user(val, argp))
                return -EFAULT;
        return err;
 }
@@ -157,7 +158,8 @@ struct compat_video_event {
        } u;
 };
 
-static int do_video_get_event(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_video_get_event(unsigned int fd, unsigned int cmd,
+               struct compat_video_event __user *up)
 {
        struct video_event kevent;
        mm_segment_t old_fs = get_fs();
@@ -168,8 +170,6 @@ static int do_video_get_event(unsigned int fd, unsigned int cmd, unsigned long a
        set_fs(old_fs);
 
        if (!err) {
-               struct compat_video_event __user *up = compat_ptr(arg);
-
                err  = put_user(kevent.type, &up->type);
                err |= put_user(kevent.timestamp, &up->timestamp);
                err |= put_user(kevent.u.size.w, &up->u.size.w);
@@ -188,15 +188,14 @@ struct compat_video_still_picture {
         int32_t size;
 };
 
-static int do_video_stillpicture(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_video_stillpicture(unsigned int fd, unsigned int cmd,
+       struct compat_video_still_picture __user *up)
 {
-       struct compat_video_still_picture __user *up;
        struct video_still_picture __user *up_native;
        compat_uptr_t fp;
        int32_t size;
        int err;
 
-       up = (struct compat_video_still_picture __user *) arg;
        err  = get_user(fp, &up->iFrame);
        err |= get_user(size, &up->size);
        if (err)
@@ -220,14 +219,13 @@ struct compat_video_spu_palette {
        compat_uptr_t palette;
 };
 
-static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_video_set_spu_palette(unsigned int fd, unsigned int cmd,
+               struct compat_video_spu_palette __user *up)
 {
-       struct compat_video_spu_palette __user *up;
        struct video_spu_palette __user *up_native;
        compat_uptr_t palp;
        int length, err;
 
-       up = (struct compat_video_spu_palette __user *) arg;
        err  = get_user(palp, &up->palette);
        err |= get_user(length, &up->length);
 
@@ -295,16 +293,15 @@ static int sg_build_iovec(sg_io_hdr_t __user *sgio, void __user *dxferp, u16 iov
        return 0;
 }
 
-static int sg_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int sg_ioctl_trans(unsigned int fd, unsigned int cmd,
+                       sg_io_hdr32_t __user *sgio32)
 {
        sg_io_hdr_t __user *sgio;
-       sg_io_hdr32_t __user *sgio32;
        u16 iovec_count;
        u32 data;
        void __user *dxferp;
        int err;
 
-       sgio32 = compat_ptr(arg);
        if (get_user(iovec_count, &sgio32->iovec_count))
                return -EFAULT;
 
@@ -394,11 +391,11 @@ struct compat_sg_req_info { /* used by SG_GET_REQUEST_TABLE ioctl() */
        int unused;
 };
 
-static int sg_grt_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int sg_grt_trans(unsigned int fd, unsigned int cmd, struct
+                       compat_sg_req_info __user *o)
 {
        int err, i;
        sg_req_info_t __user *r;
-       struct compat_sg_req_info __user *o = (void __user *)arg;
        r = compat_alloc_user_space(sizeof(sg_req_info_t)*SG_MAX_QUEUE);
        err = sys_ioctl(fd,cmd,(unsigned long)r);
        if (err < 0)
@@ -426,9 +423,9 @@ struct sock_fprog32 {
 #define PPPIOCSPASS32  _IOW('t', 71, struct sock_fprog32)
 #define PPPIOCSACTIVE32        _IOW('t', 70, struct sock_fprog32)
 
-static int ppp_sock_fprog_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int ppp_sock_fprog_ioctl_trans(unsigned int fd, unsigned int cmd,
+                       struct sock_fprog32 __user *u_fprog32)
 {
-       struct sock_fprog32 __user *u_fprog32 = compat_ptr(arg);
        struct sock_fprog __user *u_fprog64 = compat_alloc_user_space(sizeof(struct sock_fprog));
        void __user *fptr64;
        u32 fptr32;
@@ -465,15 +462,14 @@ struct ppp_idle32 {
 };
 #define PPPIOCGIDLE32          _IOR('t', 63, struct ppp_idle32)
 
-static int ppp_gidle(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int ppp_gidle(unsigned int fd, unsigned int cmd,
+               struct ppp_idle32 __user *idle32)
 {
        struct ppp_idle __user *idle;
-       struct ppp_idle32 __user *idle32;
        __kernel_time_t xmit, recv;
        int err;
 
        idle = compat_alloc_user_space(sizeof(*idle));
-       idle32 = compat_ptr(arg);
 
        err = sys_ioctl(fd, PPPIOCGIDLE, (unsigned long) idle);
 
@@ -487,15 +483,14 @@ static int ppp_gidle(unsigned int fd, unsigned int cmd, unsigned long arg)
        return err;
 }
 
-static int ppp_scompress(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int ppp_scompress(unsigned int fd, unsigned int cmd,
+       struct ppp_option_data32 __user *odata32)
 {
        struct ppp_option_data __user *odata;
-       struct ppp_option_data32 __user *odata32;
        __u32 data;
        void __user *datap;
 
        odata = compat_alloc_user_space(sizeof(*odata));
-       odata32 = compat_ptr(arg);
 
        if (get_user(data, &odata32->ptr))
                return -EFAULT;
@@ -511,35 +506,6 @@ static int ppp_scompress(unsigned int fd, unsigned int cmd, unsigned long arg)
        return sys_ioctl(fd, PPPIOCSCOMPRESS, (unsigned long) odata);
 }
 
-static int ppp_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
-{
-       int err;
-
-       switch (cmd) {
-       case PPPIOCGIDLE32:
-               err = ppp_gidle(fd, cmd, arg);
-               break;
-
-       case PPPIOCSCOMPRESS32:
-               err = ppp_scompress(fd, cmd, arg);
-               break;
-
-       default:
-               do {
-                       static int count;
-                       if (++count <= 20)
-                               printk("ppp_ioctl: Unknown cmd fd(%d) "
-                                      "cmd(%08x) arg(%08x)\n",
-                                      (int)fd, (unsigned int)cmd, (unsigned int)arg);
-               } while(0);
-               err = -EINVAL;
-               break;
-       };
-
-       return err;
-}
-
-
 #ifdef CONFIG_BLOCK
 struct mtget32 {
        compat_long_t   mt_type;
@@ -557,7 +523,7 @@ struct mtpos32 {
 };
 #define MTIOCPOS32     _IOR('m', 3, struct mtpos32)
 
-static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, void __user *argp)
 {
        mm_segment_t old_fs = get_fs();
        struct mtget get;
@@ -577,15 +543,6 @@ static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
                kcmd = MTIOCGET;
                karg = &get;
                break;
-       default:
-               do {
-                       static int count;
-                       if (++count <= 20)
-                               printk("mt_ioctl: Unknown cmd fd(%d) "
-                                      "cmd(%08x) arg(%08x)\n",
-                                      (int)fd, (unsigned int)cmd, (unsigned int)arg);
-               } while(0);
-               return -EINVAL;
        }
        set_fs (KERNEL_DS);
        err = sys_ioctl (fd, kcmd, (unsigned long)karg);
@@ -594,11 +551,11 @@ static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
                return err;
        switch (cmd) {
        case MTIOCPOS32:
-               upos32 = compat_ptr(arg);
+               upos32 = argp;
                err = __put_user(pos.mt_blkno, &upos32->mt_blkno);
                break;
        case MTIOCGET32:
-               umget32 = compat_ptr(arg);
+               umget32 = argp;
                err = __put_user(get.mt_type, &umget32->mt_type);
                err |= __put_user(get.mt_resid, &umget32->mt_resid);
                err |= __put_user(get.mt_dsreg, &umget32->mt_dsreg);
@@ -613,7 +570,8 @@ static int mt_ioctl_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
 
 #endif /* CONFIG_BLOCK */
 
-static int do_smb_getmountuid(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_smb_getmountuid(unsigned int fd, unsigned int cmd,
+                       compat_uid_t __user *argp)
 {
        mm_segment_t old_fs = get_fs();
        __kernel_uid_t kuid;
@@ -626,14 +584,15 @@ static int do_smb_getmountuid(unsigned int fd, unsigned int cmd, unsigned long a
        set_fs(old_fs);
 
        if (err >= 0)
-               err = put_user(kuid, (compat_uid_t __user *)compat_ptr(arg));
+               err = put_user(kuid, argp);
 
        return err;
 }
 
-static int ioc_settimeout(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int ioc_settimeout(unsigned int fd, unsigned int cmd,
+               compat_ulong_t __user *argp)
 {
-       return rw_long(fd, AUTOFS_IOC_SETTIMEOUT, arg);
+       return rw_long(fd, AUTOFS_IOC_SETTIMEOUT, argp);
 }
 
 /* Bluetooth ioctls */
@@ -691,7 +650,8 @@ static int set_raw32_request(struct raw_config_request *req, struct raw32_config
         return ret ? -EFAULT : 0;
 }
 
-static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
+static int raw_ioctl(unsigned fd, unsigned cmd,
+               struct raw32_config_request __user *user_req)
 {
         int ret;
 
@@ -699,7 +659,6 @@ static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
         case RAW_SETBIND:
         case RAW_GETBIND: {
                 struct raw_config_request req;
-                struct raw32_config_request __user *user_req = compat_ptr(arg);
                 mm_segment_t oldfs = get_fs();
 
                 if ((ret = get_raw32_request(&req, user_req)))
@@ -714,9 +673,6 @@ static int raw_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
                 }
                 break;
         }
-        default:
-                ret = sys_ioctl(fd, cmd, arg);
-                break;
         }
         return ret;
 }
@@ -744,11 +700,11 @@ struct serial_struct32 {
         compat_int_t    reserved[1];
 };
 
-static int serial_struct_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
+static int serial_struct_ioctl(unsigned fd, unsigned cmd,
+                       struct serial_struct32 __user *ss32)
 {
         typedef struct serial_struct SS;
         typedef struct serial_struct32 SS32;
-        struct serial_struct32 __user *ss32 = compat_ptr(arg);
         int err;
         struct serial_struct ss;
         mm_segment_t oldseg = get_fs();
@@ -798,9 +754,9 @@ struct usbdevfs_ctrltransfer32 {
 
 #define USBDEVFS_CONTROL32           _IOWR('U', 0, struct usbdevfs_ctrltransfer32)
 
-static int do_usbdevfs_control(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_usbdevfs_control(unsigned int fd, unsigned int cmd,
+                       struct usbdevfs_ctrltransfer32 __user *p32)
 {
-        struct usbdevfs_ctrltransfer32 __user *p32 = compat_ptr(arg);
         struct usbdevfs_ctrltransfer __user *p;
         __u32 udata;
         p = compat_alloc_user_space(sizeof(*p));
@@ -821,9 +777,9 @@ struct usbdevfs_bulktransfer32 {
 
 #define USBDEVFS_BULK32              _IOWR('U', 2, struct usbdevfs_bulktransfer32)
 
-static int do_usbdevfs_bulk(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_usbdevfs_bulk(unsigned int fd, unsigned int cmd,
+                       struct usbdevfs_bulktransfer32 __user *p32)
 {
-        struct usbdevfs_bulktransfer32 __user *p32 = compat_ptr(arg);
         struct usbdevfs_bulktransfer __user *p;
         compat_uint_t n;
         compat_caddr_t addr;
@@ -852,16 +808,14 @@ struct usbdevfs_disconnectsignal32 {
 
 #define USBDEVFS_DISCSIGNAL32      _IOR('U', 14, struct usbdevfs_disconnectsignal32)
 
-static int do_usbdevfs_discsignal(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_usbdevfs_discsignal(unsigned int fd, unsigned int cmd,
+                       struct usbdevfs_disconnectsignal32 __user *udis)
 {
         struct usbdevfs_disconnectsignal kdis;
-        struct usbdevfs_disconnectsignal32 __user *udis;
         mm_segment_t old_fs;
         u32 uctx;
         int err;
 
-        udis = compat_ptr(arg);
-
         if (get_user(kdis.signr, &udis->signr) ||
             __get_user(uctx, &udis->context))
                 return -EFAULT;
@@ -904,9 +858,9 @@ struct i2c_rdwr_aligned {
        struct i2c_msg msgs[0];
 };
 
-static int do_i2c_rdwr_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_i2c_rdwr_ioctl(unsigned int fd, unsigned int cmd,
+                       struct i2c_rdwr_ioctl_data32    __user *udata)
 {
-       struct i2c_rdwr_ioctl_data32    __user *udata = compat_ptr(arg);
        struct i2c_rdwr_aligned         __user *tdata;
        struct i2c_msg                  __user *tmsgs;
        struct i2c_msg32                __user *umsgs;
@@ -940,10 +894,10 @@ static int do_i2c_rdwr_ioctl(unsigned int fd, unsigned int cmd, unsigned long ar
        return sys_ioctl(fd, cmd, (unsigned long)tdata);
 }
 
-static int do_i2c_smbus_ioctl(unsigned int fd, unsigned int cmd, unsigned long arg)
+static int do_i2c_smbus_ioctl(unsigned int fd, unsigned int cmd,
+                       struct i2c_smbus_ioctl_data32   __user *udata)
 {
        struct i2c_smbus_ioctl_data     __user *tdata;
-       struct i2c_smbus_ioctl_data32   __user *udata;
        compat_caddr_t                  datap;
 
        tdata = compat_alloc_user_space(sizeof(*tdata));
@@ -952,7 +906,6 @@ static int do_i2c_smbus_ioctl(unsigned int fd, unsigned int cmd, unsigned long a
        if (!access_ok(VERIFY_WRITE, tdata, sizeof(*tdata)))
                return -EFAULT;
 
-       udata = compat_ptr(arg);
        if (!access_ok(VERIFY_READ, udata, sizeof(*udata)))
                return -EFAULT;
 
@@ -972,7 +925,7 @@ static int do_i2c_smbus_ioctl(unsigned int fd, unsigned int cmd, unsigned long a
 #define RTC_EPOCH_READ32       _IOR('p', 0x0d, compat_ulong_t)
 #define RTC_EPOCH_SET32                _IOW('p', 0x0e, compat_ulong_t)
 
-static int rtc_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
+static int rtc_ioctl(unsigned fd, unsigned cmd, void __user *argp)
 {
        mm_segment_t oldfs = get_fs();
        compat_ulong_t val32;
@@ -990,21 +943,20 @@ static int rtc_ioctl(unsigned fd, unsigned cmd, unsigned long arg)
                if (ret)
                        return ret;
                val32 = kval;
-               return put_user(val32, (unsigned int __user *)arg);
+               return put_user(val32, (unsigned int __user *)argp);
        case RTC_IRQP_SET32:
-               return sys_ioctl(fd, RTC_IRQP_SET, arg); 
+               return sys_ioctl(fd, RTC_IRQP_SET, (unsigned long)argp);
        case RTC_EPOCH_SET32:
-               return sys_ioctl(fd, RTC_EPOCH_SET, arg);
-       default:
-               /* unreached */
-               return -ENOIOCTLCMD;
+               return sys_ioctl(fd, RTC_EPOCH_SET, (unsigned long)argp);
        }
+
+       return -ENOIOCTLCMD;
 }
 
 static int
-lp_timeout_trans(unsigned int fd, unsigned int cmd, unsigned long arg)
+lp_timeout_trans(unsigned int fd, unsigned int cmd,
+                       struct compat_timeval __user *tc)
 {
-       struct compat_timeval __user *tc = (struct compat_timeval __user *)arg;
        struct timeval __user *tn = compat_alloc_user_space(sizeof(struct timeval));
        struct timeval ts;
        if (get_user(ts.tv_sec, &tc->tv_sec) ||
@@ -1032,9 +984,9 @@ struct space_resv_32 {
 #define FS_IOC_RESVSP64_32     _IOW ('X', 42, struct space_resv_32)
 
 /* just account for different alignment */
-static int compat_ioctl_preallocate(struct file *file, unsigned long arg)
+static int compat_ioctl_preallocate(struct file *file,
+                       struct space_resv_32    __user *p32)
 {
-       struct space_resv_32    __user *p32 = compat_ptr(arg);
        struct space_resv       __user *p = compat_alloc_user_space(sizeof(*p));
 
        if (copy_in_user(&p->l_type,    &p32->l_type,   sizeof(s16)) ||
@@ -1720,69 +1672,72 @@ IGNORE_IOCTL(FBIOGCURSOR32)
 static long do_ioctl_trans(int fd, unsigned int cmd,
                 unsigned long arg, struct file *file)
 {
+       void __user *argp = compat_ptr(arg);
+
        switch (cmd) {
        case PPPIOCGIDLE32:
+               return ppp_gidle(fd, cmd, argp);
        case PPPIOCSCOMPRESS32:
-               return ppp_ioctl_trans(fd, cmd, arg);
+               return ppp_scompress(fd, cmd, argp);
        case PPPIOCSPASS32:
        case PPPIOCSACTIVE32:
-               return ppp_sock_fprog_ioctl_trans(fd, cmd, arg);
+               return ppp_sock_fprog_ioctl_trans(fd, cmd, argp);
 #ifdef CONFIG_BLOCK
        case SG_IO:
-               return sg_ioctl_trans(fd, cmd, arg);
+               return sg_ioctl_trans(fd, cmd, argp);
        case SG_GET_REQUEST_TABLE:
-               return sg_grt_trans(fd, cmd, arg);
+               return sg_grt_trans(fd, cmd, argp);
        case MTIOCGET32:
        case MTIOCPOS32:
-               return mt_ioctl_trans(fd, cmd, arg);
+               return mt_ioctl_trans(fd, cmd, argp);
        /* Raw devices */
        case RAW_SETBIND:
        case RAW_GETBIND:
-               return raw_ioctl(fd, cmd, arg);
+               return raw_ioctl(fd, cmd, argp);
 #endif
 #define AUTOFS_IOC_SETTIMEOUT32 _IOWR(0x93,0x64,unsigned int)
        case AUTOFS_IOC_SETTIMEOUT32:
-               return ioc_settimeout(fd, cmd, arg);
+               return ioc_settimeout(fd, cmd, argp);
        /* One SMB ioctl needs translations. */
 #define SMB_IOC_GETMOUNTUID_32 _IOR('u', 1, compat_uid_t)
        case SMB_IOC_GETMOUNTUID_32:
-               return do_smb_getmountuid(fd, cmd, arg);
+               return do_smb_getmountuid(fd, cmd, argp);
        /* Serial */
        case TIOCGSERIAL:
        case TIOCSSERIAL:
-               return serial_struct_ioctl(fd, cmd, arg);
+               return serial_struct_ioctl(fd, cmd, argp);
        /* Usbdevfs */
        case USBDEVFS_CONTROL32:
-               return do_usbdevfs_control(fd, cmd, arg);
+               return do_usbdevfs_control(fd, cmd, argp);
        case USBDEVFS_BULK32:
-               return do_usbdevfs_bulk(fd, cmd, arg);
+               return do_usbdevfs_bulk(fd, cmd, argp);
        case USBDEVFS_DISCSIGNAL32:
-               return do_usbdevfs_discsignal(fd, cmd, arg);
+               return do_usbdevfs_discsignal(fd, cmd, argp);
        /* i2c */
        case I2C_FUNCS:
-               return w_long(fd, cmd, arg);
+               return w_long(fd, cmd, argp);
        case I2C_RDWR:
-               return do_i2c_rdwr_ioctl(fd, cmd, arg);
+               return do_i2c_rdwr_ioctl(fd, cmd, argp);
        case I2C_SMBUS:
-               return do_i2c_smbus_ioctl(fd, cmd, arg);
+               return do_i2c_smbus_ioctl(fd, cmd, argp);
        /* Not implemented in the native kernel */
        case RTC_IRQP_READ32:
        case RTC_IRQP_SET32:
        case RTC_EPOCH_READ32:
        case RTC_EPOCH_SET32:
-               return rtc_ioctl(fd, cmd, arg);
+               return rtc_ioctl(fd, cmd, argp);
 
        /* dvb */
        case VIDEO_GET_EVENT:
-               return do_video_get_event(fd, cmd, arg);
+               return do_video_get_event(fd, cmd, argp);
        case VIDEO_STILLPICTURE:
-               return do_video_stillpicture(fd, cmd, arg);
+               return do_video_stillpicture(fd, cmd, argp);
        case VIDEO_SET_SPU_PALETTE:
-               return do_video_set_spu_palette(fd, cmd, arg);
+               return do_video_set_spu_palette(fd, cmd, argp);
 
        /* lp */
        case LPSETTIMEOUT:
-               return lp_timeout_trans(fd, cmd, arg);
+               return lp_timeout_trans(fd, cmd, argp);
        }
 
        /*
@@ -1907,7 +1862,7 @@ asmlinkage long compat_sys_ioctl(unsigned int fd, unsigned int cmd,
 #if defined(CONFIG_IA64) || defined(CONFIG_X86_64)
        case FS_IOC_RESVSP_32:
        case FS_IOC_RESVSP64_32:
-               error = compat_ioctl_preallocate(filp, arg);
+               error = compat_ioctl_preallocate(filp, compat_ptr(arg));
                goto out_fput;
 #else
        case FS_IOC_RESVSP: