fs: rename inode i_atime and i_mtime fields

Rename these two fields to discourage direct access (and to help ensure
that we mop up any leftover direct accesses).

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jtlayton

include/linux/fs.h

@@ -671,8 +671,8 @@ struct inode {
 	};
 	dev_t			i_rdev;
 	loff_t			i_size;
-	struct timespec64	i_atime;
-	struct timespec64	i_mtime;
+	struct timespec64	__i_atime;
+	struct timespec64	__i_mtime;
 	struct timespec64	__i_ctime; /* use inode_*_ctime accessors! */
 	spinlock_t		i_lock;	/* i_blocks, i_bytes, maybe i_size */
 	unsigned short          i_bytes;
@@ -1513,23 +1513,23 @@ struct timespec64 inode_set_ctime_current(struct inode *inode);
 
 static inline time64_t inode_get_atime_sec(const struct inode *inode)
 {
-	return inode->i_atime.tv_sec;
+	return inode->__i_atime.tv_sec;
 }
 
 static inline long inode_get_atime_nsec(const struct inode *inode)
 {
-	return inode->i_atime.tv_nsec;
+	return inode->__i_atime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_atime(const struct inode *inode)
 {
-	return inode->i_atime;
+	return inode->__i_atime;
 }
 
 static inline struct timespec64 inode_set_atime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_atime = ts;
+	inode->__i_atime = ts;
 	return ts;
 }
 
@@ -1543,23 +1543,23 @@ static inline struct timespec64 inode_set_atime(struct inode *inode,
 
 static inline time64_t inode_get_mtime_sec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_sec;
+	return inode->__i_mtime.tv_sec;
 }
 
 static inline long inode_get_mtime_nsec(const struct inode *inode)
 {
-	return inode->i_mtime.tv_nsec;
+	return inode->__i_mtime.tv_nsec;
 }
 
 static inline struct timespec64 inode_get_mtime(const struct inode *inode)
 {
-	return inode->i_mtime;
+	return inode->__i_mtime;
 }
 
 static inline struct timespec64 inode_set_mtime_to_ts(struct inode *inode,
 						      struct timespec64 ts)
 {
-	inode->i_mtime = ts;
+	inode->__i_mtime = ts;
 	return ts;
 }