simplify access to ecryptfs inodes in ->readpage() and friends

we can get to them from page->mapping->host, no need to mess with
file.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ecryptfs/mmap.c b/fs/ecryptfs/mmap.c
index 2ee9a3a..14e81c2 100644
--- a/fs/ecryptfs/mmap.c
+++ b/fs/ecryptfs/mmap.c
@@ -198,7 +198,7 @@
 static int ecryptfs_readpage(struct file *file, struct page *page)
 {
 	struct ecryptfs_crypt_stat *crypt_stat =
-		&ecryptfs_inode_to_private(file->f_path.dentry->d_inode)->crypt_stat;
+		&ecryptfs_inode_to_private(page->mapping->host)->crypt_stat;
 	int rc = 0;
 
 	if (!crypt_stat
@@ -300,8 +300,7 @@
 
 	if (!PageUptodate(page)) {
 		struct ecryptfs_crypt_stat *crypt_stat =
-			&ecryptfs_inode_to_private(
-				file->f_path.dentry->d_inode)->crypt_stat;
+			&ecryptfs_inode_to_private(mapping->host)->crypt_stat;
 
 		if (!(crypt_stat->flags & ECRYPTFS_ENCRYPTED)
 		    || (crypt_stat->flags & ECRYPTFS_NEW_FILE)) {
@@ -487,7 +486,7 @@
 	unsigned to = from + copied;
 	struct inode *ecryptfs_inode = mapping->host;
 	struct ecryptfs_crypt_stat *crypt_stat =
-		&ecryptfs_inode_to_private(file->f_path.dentry->d_inode)->crypt_stat;
+		&ecryptfs_inode_to_private(ecryptfs_inode)->crypt_stat;
 	int rc;
 
 	if (crypt_stat->flags & ECRYPTFS_NEW_FILE) {