linux-kernel - [PATCH 2/4] iomap: move iter revert case out of the unwritten branch

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250810044806.3433783-3-alexjlzheng@tencent.com>
Date: Sun, 10 Aug 2025 12:48:04 +0800
From: alexjlzheng@...il.com
To: brauner@...nel.org,
	djwong@...nel.org
Cc: linux-xfs@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Jinliang Zheng <alexjlzheng@...cent.com>
Subject: [PATCH 2/4] iomap: move iter revert case out of the unwritten branch

From: Jinliang Zheng <alexjlzheng@...cent.com>

This reverts commit e1f453d4336d ("iomap: do some small logical
cleanup in buffered write"), for preparetion for the next patches
which allow iomap_write_end() return a partial write length.

Signed-off-by: Jinliang Zheng <alexjlzheng@...cent.com>
---
 fs/iomap/buffered-io.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 27fa93ca8675..df801220f4b3 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1019,6 +1019,11 @@ static int iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i,
 
 		if (old_size < pos)
 			pagecache_isize_extended(iter->inode, old_size, pos);
+		if (written < bytes)
+			iomap_write_failed(iter->inode, pos + written,
+					   bytes - written);
+		if (unlikely(copied != written))
+			iov_iter_revert(i, copied - written);
 
 		cond_resched();
 		if (unlikely(written == 0)) {
@@ -1028,9 +1033,6 @@ static int iomap_write_iter(struct iomap_iter *iter, struct iov_iter *i,
 			 * halfway through, might be a race with munmap,
 			 * might be severe memory pressure.
 			 */
-			iomap_write_failed(iter->inode, pos, bytes);
-			iov_iter_revert(i, copied);
-
 			if (chunk > PAGE_SIZE)
 				chunk /= 2;
 			if (copied) {
-- 
2.49.0