fuse: use DIV_ROUND_UP() for page count calculations

Use DIV_ROUND_UP() instead of manually computing round-up division
calculations.

Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Horst Birthelmer <hbirthelmer@ddn.com>
Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>

Author: joannekoong

fs/fuse/dev.c

@@ -1884,7 +1884,7 @@ static int fuse_retrieve(struct fuse_mount *fm, struct inode *inode,
 	else if (num > file_size - pos)
 		num = file_size - pos;
 
-	num_pages = (num + offset + PAGE_SIZE - 1) >> PAGE_SHIFT;
+	num_pages = DIV_ROUND_UP(num + offset, PAGE_SIZE);
 	num_pages = min(num_pages, fc->max_pages);
 	num = min(num, num_pages << PAGE_SHIFT);
 

fs/fuse/file.c

@@ -2176,7 +2176,7 @@ static bool fuse_folios_need_send(struct fuse_conn *fc, loff_t pos,
 	WARN_ON(!ap->num_folios);
 
 	/* Reached max pages */
-	if ((bytes + PAGE_SIZE - 1) >> PAGE_SHIFT > fc->max_pages)
+	if (DIV_ROUND_UP(bytes, PAGE_SIZE) > fc->max_pages)
 		return true;
 
 	if (bytes > max_bytes)