1 files changed, 151 insertions, 20 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 2146cab..9712fad 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -92,6 +92,8 @@ struct rbd_client {
 	struct list_head	node;
 };
 
+struct rbd_req_coll;
+
 /*
  * a single io request
  */
@@ -100,6 +102,24 @@ struct rbd_request {
 	struct bio		*bio;		/* cloned bio */
 	struct page		**pages;	/* list of used pages */
 	u64			len;
+	int			coll_index;
+	struct rbd_req_coll	*coll;
+};
+
+struct rbd_req_status {
+	int done;
+	int rc;
+	u64 bytes;
+};
+
+/*
+ * a collection of requests
+ */
+struct rbd_req_coll {
+	int			total;
+	int			num_done;
+	struct kref		kref;
+	struct rbd_req_status	status[0];
 };
 
 struct rbd_snap {
@@ -416,6 +436,17 @@ static void rbd_put_client(struct rbd_device *rbd_dev)
 	rbd_dev->client = NULL;
 }
 
+/*
+ * Destroy requests collection
+ */
+static void rbd_coll_release(struct kref *kref)
+{
+	struct rbd_req_coll *coll =
+		container_of(kref, struct rbd_req_coll, kref);
+
+	dout("rbd_coll_release %p\n", coll);
+	kfree(coll);
+}
 
 /*
  * Create a new header structure, translate header format from the on-disk
@@ -590,6 +621,14 @@ static u64 rbd_get_segment(struct rbd_image_header *header,
 	return len;
 }
 
+static int rbd_get_num_segments(struct rbd_image_header *header,
+				u64 ofs, u64 len)
+{
+	u64 start_seg = ofs >> header->obj_order;
+	u64 end_seg = (ofs + len - 1) >> header->obj_order;
+	return end_seg - start_seg + 1;
+}
+
 /*
  * bio helpers
  */
@@ -735,6 +774,50 @@ static void rbd_destroy_ops(struct ceph_osd_req_op *ops)
 	kfree(ops);
 }
 
+static void rbd_coll_end_req_index(struct request *rq,
+				   struct rbd_req_coll *coll,
+				   int index,
+				   int ret, u64 len)
+{
+	struct request_queue *q;
+	int min, max, i;
+
+	dout("rbd_coll_end_req_index %p index %d ret %d len %lld\n",
+	     coll, index, ret, len);
+
+	if (!rq)
+		return;
+
+	if (!coll) {
+		blk_end_request(rq, ret, len);
+		return;
+	}
+
+	q = rq->q;
+
+	spin_lock_irq(q->queue_lock);
+	coll->status[index].done = 1;
+	coll->status[index].rc = ret;
+	coll->status[index].bytes = len;
+	max = min = coll->num_done;
+	while (max < coll->total && coll->status[max].done)
+		max++;
+
+	for (i = min; i<max; i++) {
+		__blk_end_request(rq, coll->status[i].rc,
+				  coll->status[i].bytes);
+		coll->num_done++;
+		kref_put(&coll->kref, rbd_coll_release);
+	}
+	spin_unlock_irq(q->queue_lock);
+}
+
+static void rbd_coll_end_req(struct rbd_request *req,
+			     int ret, u64 len)
+{
+	rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len);
+}
+
 /*
  * Send ceph osd request
  */
@@ -749,6 +832,8 @@ static int rbd_do_request(struct request *rq,
 			  int flags,
 			  struct ceph_osd_req_op *ops,
 			  int num_reply,
+			  struct rbd_req_coll *coll,
+			  int coll_index,
 			  void (*rbd_cb)(struct ceph_osd_request *req,
 					 struct ceph_msg *msg),
 			  struct ceph_osd_request **linger_req,
@@ -763,12 +848,20 @@ static int rbd_do_request(struct request *rq,
 	struct ceph_osd_request_head *reqhead;
 	struct rbd_image_header *header = &dev->header;
 
-	ret = -ENOMEM;
 	req_data = kzalloc(sizeof(*req_data), GFP_NOIO);
-	if (!req_data)
-		goto done;
+	if (!req_data) {
+		if (coll)
+			rbd_coll_end_req_index(rq, coll, coll_index,
+					       -ENOMEM, len);
+		return -ENOMEM;
+	}
+
+	if (coll) {
+		req_data->coll = coll;
+		req_data->coll_index = coll_index;
+	}
 
-	dout("rbd_do_request len=%lld ofs=%lld\n", len, ofs);
+	dout("rbd_do_request obj=%s ofs=%lld len=%lld\n", obj, len, ofs);
 
 	down_read(&header->snap_rwsem);
 
@@ -828,7 +921,8 @@ static int rbd_do_request(struct request *rq,
 		ret = ceph_osdc_wait_request(&dev->client->osdc, req);
 		if (ver)
 			*ver = le64_to_cpu(req->r_reassert_version.version);
-		dout("reassert_ver=%lld\n", le64_to_cpu(req->r_reassert_version.version));
+		dout("reassert_ver=%lld\n",
+		     le64_to_cpu(req->r_reassert_version.version));
 		ceph_osdc_put_request(req);
 	}
 	return ret;
@@ -837,10 +931,8 @@ done_err:
 	bio_chain_put(req_data->bio);
 	ceph_osdc_put_request(req);
 done_pages:
+	rbd_coll_end_req(req_data, ret, len);
 	kfree(req_data);
-done:
-	if (rq)
-		blk_end_request(rq, ret, len);
 	return ret;
 }
 
@@ -874,7 +966,7 @@ static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
 		bytes = req_data->len;
 	}
 
-	blk_end_request(req_data->rq, rc, bytes);
+	rbd_coll_end_req(req_data, rc, bytes);
 
 	if (req_data->bio)
 		bio_chain_put(req_data->bio);
@@ -934,6 +1026,7 @@ static int rbd_req_sync_op(struct rbd_device *dev,
 			  flags,
 			  ops,
 			  2,
+			  NULL, 0,
 			  NULL,
 			  linger_req, ver);
 	if (ret < 0)
@@ -959,7 +1052,9 @@ static int rbd_do_op(struct request *rq,
 		     u64 snapid,
 		     int opcode, int flags, int num_reply,
 		     u64 ofs, u64 len,
-		     struct bio *bio)
+		     struct bio *bio,
+		     struct rbd_req_coll *coll,
+		     int coll_index)
 {
 	char *seg_name;
 	u64 seg_ofs;
@@ -995,6 +1090,7 @@ static int rbd_do_op(struct request *rq,
 			     flags,
 			     ops,
 			     num_reply,
+			     coll, coll_index,
 			     rbd_req_cb, 0, NULL);
 
 	rbd_destroy_ops(ops);
@@ -1010,13 +1106,15 @@ static int rbd_req_write(struct request *rq,
 			 struct rbd_device *rbd_dev,
 			 struct ceph_snap_context *snapc,
 			 u64 ofs, u64 len,
-			 struct bio *bio)
+			 struct bio *bio,
+			 struct rbd_req_coll *coll,
+			 int coll_index)
 {
 	return rbd_do_op(rq, rbd_dev, snapc, CEPH_NOSNAP,
 			 CEPH_OSD_OP_WRITE,
 			 CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
 			 2,
-			 ofs, len, bio);
+			 ofs, len, bio, coll, coll_index);
 }
 
 /*
@@ -1026,14 +1124,16 @@ static int rbd_req_read(struct request *rq,
 			 struct rbd_device *rbd_dev,
 			 u64 snapid,
 			 u64 ofs, u64 len,
-			 struct bio *bio)
+			 struct bio *bio,
+			 struct rbd_req_coll *coll,
+			 int coll_index)
 {
 	return rbd_do_op(rq, rbd_dev, NULL,
 			 (snapid ? snapid : CEPH_NOSNAP),
 			 CEPH_OSD_OP_READ,
 			 CEPH_OSD_FLAG_READ,
 			 2,
-			 ofs, len, bio);
+			 ofs, len, bio, coll, coll_index);
 }
 
 /*
@@ -1081,6 +1181,7 @@ static int rbd_req_sync_notify_ack(struct rbd_device *dev,
 			  CEPH_OSD_FLAG_READ,
 			  ops,
 			  1,
+			  NULL, 0,
 			  rbd_simple_req_cb, 0, NULL);
 
 	rbd_destroy_ops(ops);
@@ -1278,6 +1379,20 @@ static int rbd_req_sync_exec(struct rbd_device *dev,
 	return ret;
 }
 
+static struct rbd_req_coll *rbd_alloc_coll(int num_reqs)
+{
+	struct rbd_req_coll *coll =
+			kzalloc(sizeof(struct rbd_req_coll) +
+			        sizeof(struct rbd_req_status) * num_reqs,
+				GFP_ATOMIC);
+
+	if (!coll)
+		return NULL;
+	coll->total = num_reqs;
+	kref_init(&coll->kref);
+	return coll;
+}
+
 /*
  * block device queue callback
  */
@@ -1295,6 +1410,8 @@ static void rbd_rq_fn(struct request_queue *q)
 		bool do_write;
 		int size, op_size = 0;
 		u64 ofs;
+		int num_segs, cur_seg = 0;
+		struct rbd_req_coll *coll;
 
 		/* peek at request from block layer */
 		if (!rq)
@@ -1325,6 +1442,14 @@ static void rbd_rq_fn(struct request_queue *q)
 		     do_write ? "write" : "read",
 		     size, blk_rq_pos(rq) * 512ULL);
 
+		num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size);
+		coll = rbd_alloc_coll(num_segs);
+		if (!coll) {
+			spin_lock_irq(q->queue_lock);
+			__blk_end_request_all(rq, -ENOMEM);
+			goto next;
+		}
+
 		do {
 			/* a bio clone to be passed down to OSD req */
 			dout("rq->bio->bi_vcnt=%d\n", rq->bio->bi_vcnt);
@@ -1332,35 +1457,41 @@ static void rbd_rq_fn(struct request_queue *q)
 						  rbd_dev->header.block_name,
 						  ofs, size,
 						  NULL, NULL);
+			kref_get(&coll->kref);
 			bio = bio_chain_clone(&rq_bio, &next_bio, &bp,
 					      op_size, GFP_ATOMIC);
 			if (!bio) {
-				spin_lock_irq(q->queue_lock);
-				__blk_end_request_all(rq, -ENOMEM);
-				goto next;
+				rbd_coll_end_req_index(rq, coll, cur_seg,
+						       -ENOMEM, op_size);
+				goto next_seg;
 			}
 
+
 			/* init OSD command: write or read */
 			if (do_write)
 				rbd_req_write(rq, rbd_dev,
 					      rbd_dev->header.snapc,
 					      ofs,
-					      op_size, bio);
+					      op_size, bio,
+					      coll, cur_seg);
 			else
 				rbd_req_read(rq, rbd_dev,
 					     cur_snap_id(rbd_dev),
 					     ofs,
-					     op_size, bio);
+					     op_size, bio,
+					     coll, cur_seg);
 
+next_seg:
 			size -= op_size;
 			ofs += op_size;
 
+			cur_seg++;
 			rq_bio = next_bio;
 		} while (size > 0);
+		kref_put(&coll->kref, rbd_coll_release);
 
 		if (bp)
 			bio_pair_release(bp);
-
 		spin_lock_irq(q->queue_lock);
 next:
 		rq = blk_fetch_request(q);