From: Hyunchul Lee hyc.lee@gmail.com
[ Upstream commit a0271a15cf2cf907ea5b0f2ba611123f1b7935ec ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- fs/exfat/super.c | 10 ++++++++++ 1 file changed, 10 insertions(+)
diff --git a/fs/exfat/super.c b/fs/exfat/super.c index c1b1ed306a485..e879801533980 100644 --- a/fs/exfat/super.c +++ b/fs/exfat/super.c @@ -637,10 +637,20 @@ 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)