[Xen-devel] [PATCH] blkfront:finish requests in io-ring with EIO

[Gordon Gong <gordongong0350@xxxxxxxxx>]

Subject: [PATCH] blkfront:finished the requests in io-ring with EIO to avoid

 stucking with state of D.

The sequence of xenwatch of blkfront and xenbus_frontend, when the

tdb path of backend is gone, desided that the backend closing->

frontend closing->backend closed->frontend closed normaly or remove

started by xenbus.

---

 drivers/block/xen-blkfront.c | 23 +++++++++++++++++++++++

 1 file changed, 23 insertions(+)

diff --git a/drivers/block/xen-blkfront.c b/drivers/block/xen-blkfront.c

index 9ea8c25..6582592 100644

--- a/drivers/block/xen-blkfront.c

+++ b/drivers/block/xen-blkfront.c

@@ -653,6 +653,26 @@ static void blkif_restart_queue(struct work_struct *work)

  spin_unlock_irq(&blkif_io_lock);

 }

 

+static void finish_requests_sync(struct blkfront_info *info)

+{

+ RING_IDX rc, rp;

+ struct blkif_request *ring_req;

+ struct request *req;

+

+ rc = (info->ring.sring)->req_prod;

+ rp = info->ring.req_prod_pvt;

+

+ while(rc != cp) {

+ unsigned long id;

+

+ ring_req = RING_GET_REQUEST(&info->ring, rc);

+ id = ring_req->id;

+ req = info->shadow[id].request;

+ __blk_end_srequest_all(req, -EIO);

+ rc++;

+ }

+}

+

 static void blkif_free(struct blkfront_info *info, int suspend)

 {

  /* Prevent new requests being issued until we fix things up. */

@@ -664,6 +684,9 @@ static void blkif_free(struct blkfront_info *info, int suspend)

  blk_stop_queue(info->rq);

  /* No more gnttab callback work. */

  gnttab_cancel_free_callback(&info->callback);

+ /* Finished request in io-ring with EIO */

+ finish_requests_sync(info);

+

  spin_unlock_irq(&blkif_io_lock);

 

  /* Flush gnttab callback work. Must be done with no locks held. */

-- 

1.8.3.1

Attachment: 0001-blkfront-finished-the-requests-in-io-ring-with-EIO-t.patch
Description: Binary data

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