linux-kernel - [PATCH 1/3] mm/filemap: initialize fsdata with iocb->ki

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Message-ID: <20250421105026.19577-2-chentaotao@didiglobal.com>
Date: Mon, 21 Apr 2025 10:50:30 +0000
From: 陈涛涛 Taotao Chen <chentaotao@...iglobal.com>
To: "tytso@....edu" <tytso@....edu>, "adilger.kernel@...ger.ca"
	<adilger.kernel@...ger.ca>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>, "willy@...radead.org" <willy@...radead.org>
CC: "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	陈涛涛 Taotao Chen <chentaotao@...iglobal.com>
Subject: [PATCH 1/3] mm/filemap: initialize fsdata with iocb->ki_flags

From: Taotao Chen <chentaotao@...iglobal.com>

Initialize fsdata with &iocb->ki_flags to allow filesystems to check
iocb flags like IOCB_DONTCACHE during ->write_begin().

Signed-off-by: Taotao Chen <chentaotao@...iglobal.com>
---
 mm/filemap.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 7b90cbeb4a1a..9174b6310f0b 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -4087,7 +4087,11 @@ ssize_t generic_perform_write(struct kiocb *iocb, struct iov_iter *i)
 		size_t offset;		/* Offset into folio */
 		size_t bytes;		/* Bytes to write to folio */
 		size_t copied;		/* Bytes copied from user */
-		void *fsdata = NULL;
+		/*
+		 * Initialize fsdata with iocb flags pointer so that filesystems
+		 * can check ki_flags (like IOCB_DONTCACHE) in write operations.
+		 */
+		void *fsdata = &iocb->ki_flags;
 
 		bytes = iov_iter_count(i);
 retry:
-- 
2.34.1