Btrfs: clean up btrfs_ioctl a little bit

Provide a void __user *argp pointer so that we can avoid duplicating
the cast for various sub-command calls.

Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index cc7c5161e269047c06516674f5c751e52a126133..d2d5a5a9b026e7d92f57d29fa117ff85ac2b8f0a 100644 (file)
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -1117,20 +1117,21 @@ long btrfs_ioctl(struct file *file, unsigned int
                cmd, unsigned long arg)
 {
        struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root;
+       void __user *argp = (void __user *)arg;
 
        switch (cmd) {
        case BTRFS_IOC_SNAP_CREATE:
-               return btrfs_ioctl_snap_create(file, (void __user *)arg, 0);
+               return btrfs_ioctl_snap_create(file, argp, 0);
        case BTRFS_IOC_SUBVOL_CREATE:
-               return btrfs_ioctl_snap_create(file, (void __user *)arg, 1);
+               return btrfs_ioctl_snap_create(file, argp, 1);
        case BTRFS_IOC_DEFRAG:
                return btrfs_ioctl_defrag(file);
        case BTRFS_IOC_RESIZE:
-               return btrfs_ioctl_resize(root, (void __user *)arg);
+               return btrfs_ioctl_resize(root, argp);
        case BTRFS_IOC_ADD_DEV:
-               return btrfs_ioctl_add_dev(root, (void __user *)arg);
+               return btrfs_ioctl_add_dev(root, argp);
        case BTRFS_IOC_RM_DEV:
-               return btrfs_ioctl_rm_dev(root, (void __user *)arg);
+               return btrfs_ioctl_rm_dev(root, argp);
        case BTRFS_IOC_BALANCE:
                return btrfs_balance(root->fs_info->dev_root);
        case BTRFS_IOC_CLONE: