From: Zhengxu Zhang <zhengxu.zhang@unisoc.com>
Date: Thu, 19 Jun 2025 01:33:31 +0000 (+0800)
Subject: exfat: fdatasync flag should be same like generic_write_sync()
X-Git-Tag: v6.17-rc1~42^2~1
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=2f2d42a17b5a6711378d39df74f1f69a831c5d4e;p=thirdparty%2Fkernel%2Flinux.git

exfat: fdatasync flag should be same like generic_write_sync()

Test: androbench by default setting, use 64GB sdcard.
 the random write speed:
	without this patch 3.5MB/s
	with this patch 7MB/s

After patch "11a347fb6cef", the random write speed decreased significantly.
the .write_iter() interface had been modified, and check the differences
with generic_file_write_iter(), when calling generic_write_sync() and
exfat_file_write_iter() to call vfs_fsync_range(), the fdatasync flag is
wrong, and make not use the fdatasync mode, and make random write speed
decreased. So use generic_write_sync() instead of vfs_fsync_range().

Fixes: 11a347fb6cef ("exfat: change to get file size from DataLength")
Signed-off-by: Zhengxu Zhang <zhengxu.zhang@unisoc.com>
Acked-by: Yuezhang Mo <Yuezhang.Mo@sony.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
---

diff --git a/fs/exfat/file.c b/fs/exfat/file.c
index 6b82497572b4c..538d2b6ac2eca 100644
--- a/fs/exfat/file.c
+++ b/fs/exfat/file.c
@@ -622,9 +622,8 @@ static ssize_t exfat_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
 	if (pos > valid_size)
 		pos = valid_size;
 
-	if (iocb_is_dsync(iocb) && iocb->ki_pos > pos) {
-		ssize_t err = vfs_fsync_range(file, pos, iocb->ki_pos - 1,
-				iocb->ki_flags & IOCB_SYNC);
+	if (iocb->ki_pos > pos) {
+		ssize_t err = generic_write_sync(iocb, iocb->ki_pos - pos);
 		if (err < 0)
 			return err;
 	}