md/raid1: properly indicate failure when ending a failed write request

This patch addresses a data corruption bug in raid1 arrays using bitmaps.
Without this fix, the bitmap bits for the failed I/O end up being cleared.

Since we are in the failure leg of raid1_end_write_request, the request
either needs to be retried (R1BIO_WriteError) or failed (R1BIO_Degraded).

Fixes: eeba6809d8d5 ("md/raid1: end bio when the device faulty")
Cc: stable@vger.kernel.org # v5.2+
Signed-off-by: Paul Clements <paul.clements@us.sios.com>
Signed-off-by: Song Liu <song@kernel.org>

diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c
index d237876..ced076b 100644 (file)
--- a/drivers/md/raid1.c
+++ b/drivers/md/raid1.c
@@ -478,6 +478,8 @@ static void raid1_end_write_request(struct bio *bio)
                if (!test_bit(Faulty, &rdev->flags))
                        set_bit(R1BIO_WriteError, &r1_bio->state);
                else {
+                       /* Fail the request */
+                       set_bit(R1BIO_Degraded, &r1_bio->state);
                        /* Finished with this branch */
                        r1_bio->bios[mirror] = NULL;
                        to_put = bio;