new helper: file_inode(file)

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c
index 0cea3db..27cb9eb 100644
--- a/security/integrity/ima/ima_api.c
+++ b/security/integrity/ima/ima_api.c
@@ -140,12 +140,12 @@
 int ima_collect_measurement(struct integrity_iint_cache *iint,
 			    struct file *file)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	const char *filename = file->f_dentry->d_name.name;
 	int result = 0;
 
 	if (!(iint->flags & IMA_COLLECTED)) {
-		u64 i_version = file->f_dentry->d_inode->i_version;
+		u64 i_version = file_inode(file)->i_version;
 
 		iint->ima_xattr.type = IMA_XATTR_DIGEST;
 		result = ima_calc_hash(file, iint->ima_xattr.digest);
@@ -182,7 +182,7 @@
 	const char *op = "add_template_measure";
 	const char *audit_cause = "ENOMEM";
 	int result = -ENOMEM;
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct ima_template_entry *entry;
 	int violation = 0;
 
diff --git a/security/integrity/ima/ima_crypto.c b/security/integrity/ima/ima_crypto.c
index b21ee5b..81dcaa2 100644
--- a/security/integrity/ima/ima_crypto.c
+++ b/security/integrity/ima/ima_crypto.c
@@ -63,7 +63,7 @@
 		file->f_mode |= FMODE_READ;
 		read = 1;
 	}
-	i_size = i_size_read(file->f_dentry->d_inode);
+	i_size = i_size_read(file_inode(file));
 	while (offset < i_size) {
 		int rbuf_len;
 
diff --git a/security/integrity/ima/ima_main.c b/security/integrity/ima/ima_main.c
index dba965d..e7a147f 100644
--- a/security/integrity/ima/ima_main.c
+++ b/security/integrity/ima/ima_main.c
@@ -132,7 +132,7 @@
  */
 void ima_file_free(struct file *file)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint;
 
 	if (!iint_initialized || !S_ISREG(inode->i_mode))
@@ -148,7 +148,7 @@
 static int process_measurement(struct file *file, const unsigned char *filename,
 			       int mask, int function)
 {
-	struct inode *inode = file->f_dentry->d_inode;
+	struct inode *inode = file_inode(file);
 	struct integrity_iint_cache *iint;
 	unsigned char *pathname = NULL, *pathbuf = NULL;
 	int rc = -ENOMEM, action, must_appraise;