[PATCH] get rid of blkdev_locked_ioctl()
[kernel.git] / block / compat_ioctl.c
index 504344d..5b3db06 100644 (file)
@@ -688,12 +688,40 @@ static int compat_blkdev_driver_ioctl(struct block_device *bdev, fmode_t mode,
        return __blkdev_driver_ioctl(bdev, mode, cmd, arg);
 }
 
-static int compat_blkdev_locked_ioctl(struct block_device *bdev,
-                               unsigned cmd, unsigned long arg)
+/* Most of the generic ioctls are handled in the normal fallback path.
+   This assumes the blkdev's low level compat_ioctl always returns
+   ENOIOCTLCMD for unknown ioctls. */
+long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
 {
+       int ret = -ENOIOCTLCMD;
+       struct inode *inode = file->f_mapping->host;
+       struct block_device *bdev = inode->i_bdev;
+       struct gendisk *disk = bdev->bd_disk;
+       fmode_t mode = file->f_mode;
        struct backing_dev_info *bdi;
+       loff_t size;
+
+       if (file->f_flags & O_NDELAY)
+               mode |= FMODE_NDELAY_NOW;
 
        switch (cmd) {
+       case HDIO_GETGEO:
+               return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
+       case BLKFLSBUF:
+       case BLKROSET:
+       case BLKDISCARD:
+       /*
+        * the ones below are implemented in blkdev_locked_ioctl,
+        * but we call blkdev_ioctl, which gets the lock for us
+        */
+       case BLKRRPART:
+               return blkdev_ioctl(inode, file, cmd,
+                               (unsigned long)compat_ptr(arg));
+       case BLKBSZSET_32:
+               return blkdev_ioctl(inode, file, BLKBSZSET,
+                               (unsigned long)compat_ptr(arg));
+       case BLKPG:
+               return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
        case BLKRAGET:
        case BLKFRAGET:
                if (!arg)
@@ -719,67 +747,36 @@ static int compat_blkdev_locked_ioctl(struct block_device *bdev,
                bdi = blk_get_backing_dev_info(bdev);
                if (bdi == NULL)
                        return -ENOTTY;
+               lock_kernel();
                bdi->ra_pages = (arg * 512) / PAGE_CACHE_SIZE;
+               unlock_kernel();
                return 0;
        case BLKGETSIZE:
-               if ((bdev->bd_inode->i_size >> 9) > ~0UL)
+               size = bdev->bd_inode->i_size;
+               if ((size >> 9) > ~0UL)
                        return -EFBIG;
-               return compat_put_ulong(arg, bdev->bd_inode->i_size >> 9);
+               return compat_put_ulong(arg, size >> 9);
 
        case BLKGETSIZE64_32:
                return compat_put_u64(arg, bdev->bd_inode->i_size);
 
        case BLKTRACESETUP32:
-               return compat_blk_trace_setup(bdev, compat_ptr(arg));
+               lock_kernel();
+               ret = compat_blk_trace_setup(bdev, compat_ptr(arg));
+               unlock_kernel();
+               return ret;
        case BLKTRACESTART: /* compatible */
        case BLKTRACESTOP:  /* compatible */
        case BLKTRACETEARDOWN: /* compatible */
-               return blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
-       }
-       return -ENOIOCTLCMD;
-}
-
-/* Most of the generic ioctls are handled in the normal fallback path.
-   This assumes the blkdev's low level compat_ioctl always returns
-   ENOIOCTLCMD for unknown ioctls. */
-long compat_blkdev_ioctl(struct file *file, unsigned cmd, unsigned long arg)
-{
-       int ret = -ENOIOCTLCMD;
-       struct inode *inode = file->f_mapping->host;
-       struct block_device *bdev = inode->i_bdev;
-       struct gendisk *disk = bdev->bd_disk;
-       fmode_t mode = file->f_mode;
-       if (file->f_flags & O_NDELAY)
-               mode |= FMODE_NDELAY_NOW;
-
-       switch (cmd) {
-       case HDIO_GETGEO:
-               return compat_hdio_getgeo(disk, bdev, compat_ptr(arg));
-       case BLKFLSBUF:
-       case BLKROSET:
-       case BLKDISCARD:
-       /*
-        * the ones below are implemented in blkdev_locked_ioctl,
-        * but we call blkdev_ioctl, which gets the lock for us
-        */
-       case BLKRRPART:
-               return blkdev_ioctl(inode, file, cmd,
-                               (unsigned long)compat_ptr(arg));
-       case BLKBSZSET_32:
-               return blkdev_ioctl(inode, file, BLKBSZSET,
-                               (unsigned long)compat_ptr(arg));
-       case BLKPG:
-               return compat_blkpg_ioctl(inode, file, cmd, compat_ptr(arg));
-       }
-
-       lock_kernel();
-       ret = compat_blkdev_locked_ioctl(bdev, cmd, arg);
-       unlock_kernel();
-       if (ret == -ENOIOCTLCMD && disk->fops->compat_ioctl)
-               ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
-
-       if (ret != -ENOIOCTLCMD)
+               lock_kernel();
+               ret = blk_trace_ioctl(bdev, cmd, compat_ptr(arg));
+               unlock_kernel();
                return ret;
-
-       return compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
+       default:
+               if (disk->fops->compat_ioctl)
+                       ret = disk->fops->compat_ioctl(bdev, mode, cmd, arg);
+               if (ret == -ENOIOCTLCMD)
+                       ret = compat_blkdev_driver_ioctl(bdev, mode, cmd, arg);
+               return ret;
+       }
 }