fs/iomap.c: change return type to vm_fault_t

Change iomap_page_mkwrite() return type to vm_fault_t.

see commit 1c8f422059ae ("mm: change return type to vm_fault_t") for
reference.

Link: http://lkml.kernel.org/r/20180827172050.GA18673@jordon-HP-15-Notebook-PC
Signed-off-by: Souptick Joarder <[e-mail]>
Reviewed-by: Matthew Wilcox <[e-mail]>
Cc: Matthew Wilcox <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/iomap.c

···
 	return length;
 }
 
-int iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
+vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops)
 {
 	struct page *page = vmf->page;
 	struct inode *inode = file_inode(vmf->vma->vm_file);

include/linux/iomap.h

···
 #include <linux/bitmap.h>
 #include <linux/mm.h>
 #include <linux/types.h>
+#include <linux/mm_types.h>
 
 struct address_space;
 struct fiemap_extent_info;
···
 		bool *did_zero, const struct iomap_ops *ops);
 int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
 		const struct iomap_ops *ops);
-int iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops);
+vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf,
+			const struct iomap_ops *ops);
 int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
 		loff_t start, loff_t len, const struct iomap_ops *ops);
 loff_t iomap_seek_hole(struct inode *inode, loff_t offset,