[PATCH 08/13] mm: move putting the page on error out of filemap_readpage

[Christoph Hellwig <hch@xxxxxx>]

Move the put_page on error from filemap_readpage into the callers.

Signed-off-by: Christoph Hellwig <hch@xxxxxx>
---
 mm/filemap.c | 35 ++++++++++++++++-------------------
 1 file changed, 16 insertions(+), 19 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 96855299247c56..6089f1d9dd429f 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2171,11 +2171,11 @@ static int lock_page_for_iocb(struct kiocb *iocb, struct page *page)
 static int filemap_readpage(struct kiocb *iocb, struct page *page)
 {
 	struct file *file = iocb->ki_filp;
-	int error = -EAGAIN;
+	int error;
 
 	if (iocb->ki_flags & (IOCB_NOIO | IOCB_NOWAIT)) {
 		unlock_page(page);
-		goto out_put_page;
+		return -EAGAIN;
 	}
 
 	/*
@@ -2186,12 +2186,12 @@ static int filemap_readpage(struct kiocb *iocb, struct page *page)
 	/* Start the actual read. The read will unlock the page. */
 	error = file->f_mapping->a_ops->readpage(file, page);
 	if (unlikely(error))
-		goto out_put_page;
+		return error;
 
 	if (!PageUptodate(page)) {
 		error = lock_page_for_iocb(iocb, page);
 		if (unlikely(error))
-			goto out_put_page;
+			return error;
 
 		if (!PageUptodate(page)) {
 			if (page->mapping == NULL) {
@@ -2199,22 +2199,16 @@ static int filemap_readpage(struct kiocb *iocb, struct page *page)
 				 * invalidate_mapping_pages got it
 				 */
 				unlock_page(page);
-				error = AOP_TRUNCATED_PAGE;
-				goto out_put_page;
+				return AOP_TRUNCATED_PAGE;
 			}
 			unlock_page(page);
 			shrink_readahead_size_eio(&file->f_ra);
-			error = -EIO;
-			goto out_put_page;
+			return -EIO;
 		}
 
 		unlock_page(page);
 	}
 	return 0;
-
-out_put_page:
-	put_page(page);
-	return error;
 }
 
 static int filemap_make_page_uptodate(struct kiocb *iocb, struct iov_iter *iter,
@@ -2293,7 +2287,10 @@ static int filemap_make_page_uptodate(struct kiocb *iocb, struct iov_iter *iter,
 	/* Did somebody else fill it already? */
 	if (PageUptodate(page))
 		goto unlock_page;
-	return filemap_readpage(iocb, page);
+	error = filemap_readpage(iocb, page);
+	if (error)
+		goto put_page;
+	return 0;
 
 put_page:
 	put_page(page);
@@ -2315,15 +2312,15 @@ static int filemap_new_page(struct kiocb *iocb, struct iov_iter *iter,
 	if (!page)
 		return -ENOMEM;
 	error = add_to_page_cache_lru(*page, mapping, index, gfp);
-	if (error) {
-		put_page(*page);
-		return error;
-	}
-
+	if (error)
+		goto put_page;
 	error = filemap_readpage(iocb, *page);
 	if (error)
-		return error;
+		goto put_page;
 	return filemap_make_page_uptodate(iocb, iter, *page, index, true);
+put_page:
+	put_page(*page);
+	return error;
 }
 
 static int filemap_find_get_pages(struct kiocb *iocb, struct iov_iter *iter,
-- 
2.28.0