linux-kernel - [PATCH v2 1/2] mm/readahead: break read-ahead loop if filemap_add

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Date: Fri, 22 Mar 2024 17:35:54 +0800
From: Liu Shixin <liushixin2@...wei.com>
To: Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>, Andrew
 Morton <akpm@...ux-foundation.org>, Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>
CC: <linux-fsdevel@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-mm@...ck.org>, Liu Shixin <liushixin2@...wei.com>
Subject: [PATCH v2 1/2] mm/readahead: break read-ahead loop if filemap_add_folio return -ENOMEM

When filemap_add_folio() return -ENOMEM, break read-ahead loop like what
filemap_alloc_folio() does.

Signed-off-by: Liu Shixin <liushixin2@...wei.com>
Signed-off-by: Jinjiang Tu <tujinjiang@...wei.com>
Reviewed-by: Jan Kara <jack@...e.cz>
---
 mm/readahead.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/mm/readahead.c b/mm/readahead.c
index 2648ec4f0494..a8513ffbb17f 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -228,6 +228,7 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
 	 */
 	for (i = 0; i < nr_to_read; i++) {
 		struct folio *folio = xa_load(&mapping->i_pages, index + i);
+		int ret;
 
 		if (folio && !xa_is_value(folio)) {
 			/*
@@ -247,9 +248,12 @@ void page_cache_ra_unbounded(struct readahead_control *ractl,
 		folio = filemap_alloc_folio(gfp_mask, 0);
 		if (!folio)
 			break;
-		if (filemap_add_folio(mapping, folio, index + i,
-					gfp_mask) < 0) {
+
+		ret = filemap_add_folio(mapping, folio, index + i, gfp_mask);
+		if (ret < 0) {
 			folio_put(folio);
+			if (ret == -ENOMEM)
+				break;
 			read_pages(ractl);
 			ractl->_index++;
 			i = ractl->_index + ractl->_nr_pages - index - 1;
-- 
2.25.1