linux-kernel - [PATCH -next v2 11/22] ext4: pass out extent seq counter when mapping da blocks

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Message-ID: <20260203062523.3869120-12-yi.zhang@huawei.com>
Date: Tue,  3 Feb 2026 14:25:11 +0800
From: Zhang Yi <yi.zhang@...wei.com>
To: linux-ext4@...r.kernel.org
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tytso@....edu,
	adilger.kernel@...ger.ca,
	jack@...e.cz,
	ojaswin@...ux.ibm.com,
	ritesh.list@...il.com,
	hch@...radead.org,
	djwong@...nel.org,
	yi.zhang@...wei.com,
	yi.zhang@...weicloud.com,
	yizhang089@...il.com,
	libaokun1@...wei.com,
	yangerkun@...wei.com,
	yukuai@...as.com
Subject: [PATCH -next v2 11/22] ext4: pass out extent seq counter when mapping da blocks

The iomap buffered write path does not hold any locks between querying
the inode extent mapping information and performing buffered writes. It
relies on the sequence counter saved in the inode to determine whether
the mapping information is stale. Commit 07c440e8da8f ("ext4: pass out
extent seq counter when mapping blocks") passed out the sequence number
when mapping blocks, but missed two places where it would be used later
in the iomap buffered delayed write path; these have now been filled in.

Signed-off-by: Zhang Yi <yi.zhang@...wei.com>
---
 fs/ext4/inode.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 25d9462d2da7..c9489978358e 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1903,7 +1903,7 @@ static int ext4_da_map_blocks(struct inode *inode, struct ext4_map_blocks *map)
 	ext4_check_map_extents_env(inode);
 
 	/* Lookup extent status tree firstly */
-	if (ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es, NULL)) {
+	if (ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es, &map->m_seq)) {
 		map->m_len = min_t(unsigned int, map->m_len,
 				   es.es_len - (map->m_lblk - es.es_lblk));
 
@@ -1956,7 +1956,7 @@ static int ext4_da_map_blocks(struct inode *inode, struct ext4_map_blocks *map)
 	 * is held in write mode, before inserting a new da entry in
 	 * the extent status tree.
 	 */
-	if (ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es, NULL)) {
+	if (ext4_es_lookup_extent(inode, map->m_lblk, NULL, &es, &map->m_seq)) {
 		map->m_len = min_t(unsigned int, map->m_len,
 				   es.es_len - (map->m_lblk - es.es_lblk));
 
-- 
2.52.0