diff options
Diffstat (limited to 'drivers/block/drbd')
| -rw-r--r-- | drivers/block/drbd/drbd_req.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/drivers/block/drbd/drbd_req.c b/drivers/block/drbd/drbd_req.c index 355cf1064593..68151271fc5f 100644 --- a/drivers/block/drbd/drbd_req.c +++ b/drivers/block/drbd/drbd_req.c @@ -1258,6 +1258,22 @@ drbd_request_prepare(struct drbd_device *device, struct bio *bio, unsigned long return NULL; } +/* Require at least one path to current data. + * We don't want to allow writes on C_STANDALONE D_INCONSISTENT: + * We would not allow to read what was written, + * we would not have bumped the data generation uuids, + * we would cause data divergence for all the wrong reasons. + * + * If we don't see at least one D_UP_TO_DATE, we will fail this request, + * which either returns EIO, or, if OND_SUSPEND_IO is set, suspends IO, + * and queues for retry later. + */ +static bool may_do_writes(struct drbd_device *device) +{ + const union drbd_dev_state s = device->state; + return s.disk == D_UP_TO_DATE || s.pdsk == D_UP_TO_DATE; +} + static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request *req) { struct drbd_resource *resource = device->resource; @@ -1312,6 +1328,12 @@ static void drbd_send_and_submit(struct drbd_device *device, struct drbd_request } if (rw == WRITE) { + if (req->private_bio && !may_do_writes(device)) { + bio_put(req->private_bio); + req->private_bio = NULL; + put_ldev(device); + goto nodata; + } if (!drbd_process_write_request(req)) no_remote = true; } else { |