From: Yongpeng Yang <yangyongpeng@xiaomi.com>
Date: Fri, 9 Jan 2026 14:46:18 +0000 (+0800)
Subject: f2fs: avoid unnecessary block mapping lookups in f2fs_read_data_large_folio
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=540d34c18272d124ef3113b7dbe499304ce0023c;p=thirdparty%2Fkernel%2Flinux.git

f2fs: avoid unnecessary block mapping lookups in f2fs_read_data_large_folio

In the second call to f2fs_map_blocks within f2fs_read_data_large_folio,
map.m_len exceeds the logical address space to be read. This patch
ensures map.m_len does not exceed the required address space.

Signed-off-by: Yongpeng Yang <yangyongpeng@xiaomi.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 9b70b6d33703..7aa1cd43898f 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -2468,7 +2468,7 @@ next_folio:
 	ffs = NULL;
 	nrpages = folio_nr_pages(folio);
 
-	for (; nrpages; nrpages--) {
+	for (; nrpages; nrpages--, max_nr_pages--) {
 		sector_t block_nr;
 		/*
 		 * Map blocks using the previous result first.