fs: Turn __generic_write_end into a void function

The VFS-internal __generic_write_end helper always returns the value of
its @copied argument.  This can be confusing, and it isn't very useful
anyway, so turn __generic_write_end into a function returning void
instead.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

fs/buffer.c

@@ -2085,7 +2085,7 @@ int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
 }
 EXPORT_SYMBOL(block_write_begin);
 
-int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
+void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
 		struct page *page)
 {
 	loff_t old_size = inode->i_size;
@@ -2116,7 +2116,6 @@ int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
 	 */
 	if (i_size_changed)
 		mark_inode_dirty(inode);
-	return copied;
 }
 
 int block_write_end(struct file *file, struct address_space *mapping,
@@ -2160,7 +2159,8 @@ int generic_write_end(struct file *file, struct address_space *mapping,
 			struct page *page, void *fsdata)
 {
 	copied = block_write_end(file, mapping, pos, len, copied, page, fsdata);
-	return __generic_write_end(mapping->host, pos, copied, page);
+	__generic_write_end(mapping->host, pos, copied, page);
+	return copied;
 }
 EXPORT_SYMBOL(generic_write_end);
 

fs/internal.h

@@ -44,7 +44,7 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
 extern void guard_bio_eod(int rw, struct bio *bio);
 extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
 		get_block_t *get_block, struct iomap *iomap);
-int __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
+void __generic_write_end(struct inode *inode, loff_t pos, unsigned copied,
 		struct page *page);
 
 /*

fs/iomap.c

@@ -769,7 +769,7 @@ iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
 		ret = __iomap_write_end(inode, pos, len, copied, page, iomap);
 	}
 
-	ret = __generic_write_end(inode, pos, ret, page);
+	__generic_write_end(inode, pos, ret, page);
 	if (iomap->page_done)
 		iomap->page_done(inode, pos, copied, page, iomap);