From a0271a15cf2cf907ea5b0f2ba611123f1b7935ec Mon Sep 17 00:00:00 2001

From: Hyunchul Lee <hyc.lee@gmail.com>

Date: Tue, 16 Jun 2020 14:34:45 +0900

Subject: [Backport a0271a15cf2c] exfat: call sync_filesystem for read-only

 remount

We need to commit dirty metadata and pages to disk

before remounting exfat as read-only.

This fixes a failure in xfstests generic/452

generic/452 does the following:

cp something <exfat>/

mount -o remount,ro <exfat>

the <exfat>/something is corrupted. because while

exfat is remounted as read-only, exfat doesn't

have a chance to commit metadata and

vfs invalidates page caches in a block device.

Signed-off-by: Hyunchul Lee <hyc.lee@gmail.com>

Acked-by: Sungjong Seo <sj1557.seo@samsung.com>

Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>

---

 src/super.c | 10 ++++++++++

 1 file changed, 10 insertions(+)

diff --git a/src/super.c b/src/super.c

index e650e65536f848c544b731f273b5f8839298e850..253a92460d5222f4f3aa75e52fc0b3eab084bc06 100644

--- a/src/super.c

+++ b/src/super.c

@@ -693,10 +693,20 @@ static void exfat_free(struct fs_context *fc)

 	}

 }

+static int exfat_reconfigure(struct fs_context *fc)

+{

+	fc->sb_flags |= SB_NODIRATIME;

+

+	/* volume flag will be updated in exfat_sync_fs */

+	sync_filesystem(fc->root->d_sb);

+	return 0;

+}

+

 static const struct fs_context_operations exfat_context_ops = {

 	.parse_param	= exfat_parse_param,

 	.get_tree	= exfat_get_tree,

 	.free		= exfat_free,

+	.reconfigure	= exfat_reconfigure,

 };

 static int exfat_init_fs_context(struct fs_context *fc)

-- 

2.31.1