dm verity: skip verity work if I/O error when system is shutting down

If emergency system shutdown is called, like by thermal shutdown,
a dm device could be alive when the block device couldn't process
I/O requests anymore. In this state, the handling of I/O errors
by new dm I/O requests or by those already in-flight can lead to
a verity corruption state, which is a misjudgment.

So, skip verity work in response to I/O error when system is shutting
down.

Signed-off-by: Hyeongseok Kim <hyeongseok@gmail.com>
Reviewed-by: Sami Tolvanen <samitolvanen@google.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

diff --git a/drivers/md/dm-verity-target.c b/drivers/md/dm-verity-target.c
index f74982d..6b8e5bd 100644 (file)
--- a/drivers/md/dm-verity-target.c
+++ b/drivers/md/dm-verity-target.c
@@ -537,6 +537,15 @@ static int verity_verify_io(struct dm_verity_io *io)
        return 0;
 }
 
+/*
+ * Skip verity work in response to I/O error when system is shutting down.
+ */
+static inline bool verity_is_system_shutting_down(void)
+{
+       return system_state == SYSTEM_HALT || system_state == SYSTEM_POWER_OFF
+               || system_state == SYSTEM_RESTART;
+}
+
 /*
  * End one "io" structure with a given error.
  */
@@ -564,7 +573,8 @@ static void verity_end_io(struct bio *bio)
 {
        struct dm_verity_io *io = bio->bi_private;
 
-       if (bio->bi_status && !verity_fec_is_enabled(io->v)) {
+       if (bio->bi_status &&
+           (!verity_fec_is_enabled(io->v) || verity_is_system_shutting_down())) {
                verity_finish_io(io, bio->bi_status);
                return;
        }