[RFC 06/10] Use vfs_permission instead of file_permission in do_path_lookup

[Andreas Gruenbacher <agruen@suse.de>]

[-- Attachment #1: do_path_lookup.diff --]
[-- Type: text/plain, Size: 1113 bytes --]

Switch from file_permission() to vfs_permission() in do_path_lookup()
by filling in the vfs_lookup in nd slightly earlier.

Signed-off-by: Andreas Gruenbacher <ag@bestbits.at>

---
 fs/namei.c |   12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1133,25 +1133,23 @@ static int fastcall do_path_lookup(int d
 		nd->lookup.path.dentry = dget(fs->pwd);
 		read_unlock(&fs->lock);
 	} else {
-		struct dentry *dentry;
-
 		file = fget_light(dfd, &fput_needed);
 		retval = -EBADF;
 		if (!file)
 			goto out_fail;
 
-		dentry = file->f_path.dentry;
+		nd->lookup.path = file->f_path;
 
 		retval = -ENOTDIR;
-		if (!S_ISDIR(dentry->d_inode->i_mode))
+		if (!S_ISDIR(nd->lookup.path.dentry->d_inode->i_mode))
 			goto fput_fail;
 
-		retval = file_permission(file, MAY_EXEC);
+		retval = vfs_permission(&nd->lookup, MAY_EXEC);
 		if (retval)
 			goto fput_fail;
 
-		nd->lookup.path.mnt = mntget(file->f_path.mnt);
-		nd->lookup.path.dentry = dget(dentry);
+		mntget(nd->lookup.path.mnt);
+		dget(nd->lookup.path.dentry);
 
 		fput_light(file, fput_needed);
 	}