vfs: cleanup do_vfs_ioctl()

Move declaration of 'inode' to beginning of the function. Since it
is referenced directly or indirectly (in case of FIFREEZE/FITHAW/
FS_IOC_FIEMAP) it's not harmful IMHO. And remove unnecessary casts
using 'argp' instead.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 1eebeb7..1d9b9fc 100644 (file)
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -548,6 +548,7 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
 {
        int error = 0;
        int __user *argp = (int __user *)arg;
+       struct inode *inode = filp->f_path.dentry->d_inode;
 
        switch (cmd) {
        case FIOCLEX:
@@ -567,13 +568,11 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                break;
 
        case FIOQSIZE:
-               if (S_ISDIR(filp->f_path.dentry->d_inode->i_mode) ||
-                   S_ISREG(filp->f_path.dentry->d_inode->i_mode) ||
-                   S_ISLNK(filp->f_path.dentry->d_inode->i_mode)) {
-                       loff_t res =
-                               inode_get_bytes(filp->f_path.dentry->d_inode);
-                       error = copy_to_user((loff_t __user *)arg, &res,
-                                            sizeof(res)) ? -EFAULT : 0;
+               if (S_ISDIR(inode->i_mode) || S_ISREG(inode->i_mode) ||
+                   S_ISLNK(inode->i_mode)) {
+                       loff_t res = inode_get_bytes(inode);
+                       error = copy_to_user(argp, &res, sizeof(res)) ?
+                                       -EFAULT : 0;
                } else
                        error = -ENOTTY;
                break;
@@ -590,14 +589,10 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
                return ioctl_fiemap(filp, arg);
 
        case FIGETBSZ:
-       {
-               struct inode *inode = filp->f_path.dentry->d_inode;
-               int __user *p = (int __user *)arg;
-               return put_user(inode->i_sb->s_blocksize, p);
-       }
+               return put_user(inode->i_sb->s_blocksize, argp);
 
        default:
-               if (S_ISREG(filp->f_path.dentry->d_inode->i_mode))
+               if (S_ISREG(inode->i_mode))
                        error = file_ioctl(filp, cmd, arg);
                else
                        error = vfs_ioctl(filp, cmd, arg);