f2fs: remove unused PAGE_PRIVATE_ATOMIC_WRITE

Commit 3db1de0e ("f2fs: change the current atomic write way")
has removed all users of PAGE_PRIVATE_ATOMIC_WRITE, remove its
definition and related functions.
Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

fs/f2fs/f2fs.h

@@ -1396,19 +1396,17 @@ static inline void f2fs_clear_bit(unsigned int nr, char *addr);
  * Layout A: lowest bit should be 1
  * | bit0 = 1 | bit1 | bit2 | ... | bit MAX | private data .... |
  * bit 0	PAGE_PRIVATE_NOT_POINTER
- * bit 1	PAGE_PRIVATE_ATOMIC_WRITE
- * bit 2	PAGE_PRIVATE_DUMMY_WRITE
- * bit 3	PAGE_PRIVATE_ONGOING_MIGRATION
- * bit 4	PAGE_PRIVATE_INLINE_INODE
- * bit 5	PAGE_PRIVATE_REF_RESOURCE
- * bit 6-	f2fs private data
+ * bit 1	PAGE_PRIVATE_DUMMY_WRITE
+ * bit 2	PAGE_PRIVATE_ONGOING_MIGRATION
+ * bit 3	PAGE_PRIVATE_INLINE_INODE
+ * bit 4	PAGE_PRIVATE_REF_RESOURCE
+ * bit 5-	f2fs private data
  *
  * Layout B: lowest bit should be 0
  * page.private is a wrapped pointer.
  */
 enum {
 	PAGE_PRIVATE_NOT_POINTER,		/* private contains non-pointer data */
-	PAGE_PRIVATE_ATOMIC_WRITE,		/* data page from atomic write path */
 	PAGE_PRIVATE_DUMMY_WRITE,		/* data page for padding aligned IO */
 	PAGE_PRIVATE_ONGOING_MIGRATION,		/* data page which is on-going migrating */
 	PAGE_PRIVATE_INLINE_INODE,		/* inode page contains inline data */
@@ -1453,19 +1451,16 @@ PAGE_PRIVATE_GET_FUNC(nonpointer, NOT_POINTER);
 PAGE_PRIVATE_GET_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_GET_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_GET_FUNC(gcing, ONGOING_MIGRATION);
-PAGE_PRIVATE_GET_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_GET_FUNC(dummy, DUMMY_WRITE);
 
 PAGE_PRIVATE_SET_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_SET_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_SET_FUNC(gcing, ONGOING_MIGRATION);
-PAGE_PRIVATE_SET_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_SET_FUNC(dummy, DUMMY_WRITE);
 
 PAGE_PRIVATE_CLEAR_FUNC(reference, REF_RESOURCE);
 PAGE_PRIVATE_CLEAR_FUNC(inline, INLINE_INODE);
 PAGE_PRIVATE_CLEAR_FUNC(gcing, ONGOING_MIGRATION);
-PAGE_PRIVATE_CLEAR_FUNC(atomic, ATOMIC_WRITE);
 PAGE_PRIVATE_CLEAR_FUNC(dummy, DUMMY_WRITE);
 
 static inline unsigned long get_page_private_data(struct page *page)