[PATCH v3 04/18] mm/filemap: Inline wait_on_page_read into its one caller

["Matthew Wilcox (Oracle)" <willy@infradead.org>]

Having this code inline helps the function read more easily.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 mm/filemap.c | 20 ++++----------------
 1 file changed, 4 insertions(+), 16 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 95b68ec1f22c..0ef06d515532 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2834,18 +2834,6 @@ EXPORT_SYMBOL(filemap_page_mkwrite);
 EXPORT_SYMBOL(generic_file_mmap);
 EXPORT_SYMBOL(generic_file_readonly_mmap);
 
-static struct page *wait_on_page_read(struct page *page)
-{
-	if (!IS_ERR(page)) {
-		wait_on_page_locked(page);
-		if (!PageUptodate(page)) {
-			put_page(page);
-			page = ERR_PTR(-EIO);
-		}
-	}
-	return page;
-}
-
 static struct page *do_read_cache_page(struct address_space *mapping,
 				pgoff_t index,
 				int (*filler)(void *, struct page *),
@@ -2876,7 +2864,10 @@ static struct page *do_read_cache_page(struct address_space *mapping,
 			err = mapping->a_ops->readpage(data, page);
 		if (err == AOP_UPDATED_PAGE) {
 			unlock_page(page);
-			goto out;
+		} else if (!err) {
+			wait_on_page_locked(page);
+			if (!PageUptodate(page))
+				err = -EIO;
 		}
 
 		if (err < 0) {
@@ -2884,9 +2875,6 @@ static struct page *do_read_cache_page(struct address_space *mapping,
 			return ERR_PTR(err);
 		}
 
-		page = wait_on_page_read(page);
-		if (IS_ERR(page))
-			return page;
 		goto out;
 	}
 	if (PageUptodate(page))
-- 
2.28.0