Merge branch 'testing' of github.com:ceph/ceph-client into v3.8-rc5-testing

14 files changed, 652 insertions, 611 deletions

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 89576a0b3f2..668936381ab 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -52,9 +52,12 @@
 #define	SECTOR_SHIFT	9
 #define	SECTOR_SIZE	(1ULL << SECTOR_SHIFT)
 
-/* It might be useful to have this defined elsewhere too */
+/* It might be useful to have these defined elsewhere */
 
-#define	U64_MAX	((u64) (~0ULL))
+#define	U8_MAX	((u8)	(~0U))
+#define	U16_MAX	((u16)	(~0U))
+#define	U32_MAX	((u32)	(~0U))
+#define	U64_MAX	((u64)	(~0ULL))
 
 #define RBD_DRV_NAME "rbd"
 #define RBD_DRV_NAME_LONG "rbd (rados block device)"
@@ -66,7 +69,6 @@
 			(NAME_MAX - (sizeof (RBD_SNAP_DEV_NAME_PREFIX) - 1))
 
 #define RBD_MAX_SNAP_COUNT	510	/* allows max snapc to fit in 4KB */
-#define RBD_MAX_OPT_LEN		1024
 
 #define RBD_SNAP_HEAD_NAME	"-"
 
@@ -93,8 +95,6 @@
 #define DEV_NAME_LEN		32
 #define MAX_INT_FORMAT_WIDTH	((5 * sizeof (int)) / 2 + 1)
 
-#define RBD_READ_ONLY_DEFAULT		false
-
 /*
  * block device image metadata (in-memory version)
  */
@@ -119,16 +119,33 @@ struct rbd_image_header {
  * An rbd image specification.
  *
  * The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
- * identify an image.
+ * identify an image.  Each rbd_dev structure includes a pointer to
+ * an rbd_spec structure that encapsulates this identity.
+ *
+ * Each of the id's in an rbd_spec has an associated name.  For a
+ * user-mapped image, the names are supplied and the id's associated
+ * with them are looked up.  For a layered image, a parent image is
+ * defined by the tuple, and the names are looked up.
+ *
+ * An rbd_dev structure contains a parent_spec pointer which is
+ * non-null if the image it represents is a child in a layered
+ * image.  This pointer will refer to the rbd_spec structure used
+ * by the parent rbd_dev for its own identity (i.e., the structure
+ * is shared between the parent and child).
+ *
+ * Since these structures are populated once, during the discovery
+ * phase of image construction, they are effectively immutable so
+ * we make no effort to synchronize access to them.
+ *
+ * Note that code herein does not assume the image name is known (it
+ * could be a null pointer).
  */
 struct rbd_spec {
 	u64		pool_id;
 	char		*pool_name;
 
 	char		*image_id;
-	size_t		image_id_len;
 	char		*image_name;
-	size_t		image_name_len;
 
 	u64		snap_id;
 	char		*snap_name;
@@ -136,10 +153,6 @@ struct rbd_spec {
 	struct kref	kref;
 };
 
-struct rbd_options {
-	bool	read_only;
-};
-
 /*
  * an instance of the client.  multiple devices may share an rbd client.
  */
@@ -154,7 +167,7 @@ struct rbd_client {
  */
 struct rbd_req_status {
 	int done;
-	int rc;
+	s32 rc;
 	u64 bytes;
 };
 
@@ -212,11 +225,13 @@ struct rbd_device {
 	spinlock_t		lock;		/* queue lock */
 
 	struct rbd_image_header	header;
-	bool                    exists;
+	atomic_t		exists;
 	struct rbd_spec		*spec;
 
 	char			*header_name;
 
+	struct ceph_file_layout	layout;
+
 	struct ceph_osd_event   *watch_event;
 	struct ceph_osd_request *watch_request;
 
@@ -277,6 +292,33 @@ static struct device rbd_root_dev = {
 	.release =      rbd_root_dev_release,
 };
 
+static __printf(2, 3)
+void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	if (!rbd_dev)
+		printk(KERN_WARNING "%s: %pV\n", RBD_DRV_NAME, &vaf);
+	else if (rbd_dev->disk)
+		printk(KERN_WARNING "%s: %s: %pV\n",
+			RBD_DRV_NAME, rbd_dev->disk->disk_name, &vaf);
+	else if (rbd_dev->spec && rbd_dev->spec->image_name)
+		printk(KERN_WARNING "%s: image %s: %pV\n",
+			RBD_DRV_NAME, rbd_dev->spec->image_name, &vaf);
+	else if (rbd_dev->spec && rbd_dev->spec->image_id)
+		printk(KERN_WARNING "%s: id %s: %pV\n",
+			RBD_DRV_NAME, rbd_dev->spec->image_id, &vaf);
+	else	/* punt */
+		printk(KERN_WARNING "%s: rbd_dev %p: %pV\n",
+			RBD_DRV_NAME, rbd_dev, &vaf);
+	va_end(args);
+}
+
 #ifdef RBD_DEBUG
 #define rbd_assert(expr)						\
 		if (unlikely(!(expr))) {				\
@@ -426,6 +468,12 @@ static match_table_t rbd_opts_tokens = {
 	{-1, NULL}
 };
 
+struct rbd_options {
+	bool	read_only;
+};
+
+#define RBD_READ_ONLY_DEFAULT	false
+
 static int parse_rbd_opts_token(char *c, void *private)
 {
 	struct rbd_options *rbd_opts = private;
@@ -707,7 +755,7 @@ static int rbd_dev_set_mapping(struct rbd_device *rbd_dev)
 			goto done;
 		rbd_dev->mapping.read_only = true;
 	}
-	rbd_dev->exists = true;
+	atomic_set(&rbd_dev->exists, 1);
 done:
 	return ret;
 }
@@ -724,7 +772,7 @@ static void rbd_header_free(struct rbd_image_header *header)
 	header->snapc = NULL;
 }
 
-static char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
+static const char *rbd_segment_name(struct rbd_device *rbd_dev, u64 offset)
 {
 	char *name;
 	u64 segment;
@@ -772,6 +820,7 @@ static int rbd_get_num_segments(struct rbd_image_header *header,
 {
 	u64 start_seg;
 	u64 end_seg;
+	u64 result;
 
 	if (!len)
 		return 0;
@@ -781,7 +830,11 @@ static int rbd_get_num_segments(struct rbd_image_header *header,
 	start_seg = ofs >> header->obj_order;
 	end_seg = (ofs + len - 1) >> header->obj_order;
 
-	return end_seg - start_seg + 1;
+	result = end_seg - start_seg + 1;
+	if (result > (u64) INT_MAX)
+		return -ERANGE;
+
+	return (int) result;
 }
 
 /*
@@ -949,8 +1002,10 @@ static struct bio *bio_chain_clone_range(struct bio **bio_src,
 		unsigned int bi_size;
 		struct bio *bio;
 
-		if (!bi)
+		if (!bi) {
+			rbd_warn(NULL, "bio_chain exhausted with %u left", len);
 			goto out_err;	/* EINVAL; ran out of bio's */
+		}
 		bi_size = min_t(unsigned int, bi->bi_size - off, len);
 		bio = bio_clone_range(bi, off, bi_size, gfpmask);
 		if (!bio)
@@ -976,44 +1031,84 @@ out_err:
 	return NULL;
 }
 
-/*
- * helpers for osd request op vectors.
- */
-static struct ceph_osd_req_op *rbd_create_rw_ops(int num_ops,
-					int opcode, u32 payload_len)
+struct ceph_osd_req_op *rbd_osd_req_op_create(u16 opcode, ...)
 {
-	struct ceph_osd_req_op *ops;
+	struct ceph_osd_req_op *op;
+	va_list args;
+	size_t size;
 
-	ops = kzalloc(sizeof (*ops) * (num_ops + 1), GFP_NOIO);
-	if (!ops)
+	op = kzalloc(sizeof (*op), GFP_NOIO);
+	if (!op)
 		return NULL;
+	op->op = opcode;
+	va_start(args, opcode);
+	switch (opcode) {
+	case CEPH_OSD_OP_READ:
+	case CEPH_OSD_OP_WRITE:
+		/* rbd_osd_req_op_create(READ, offset, length) */
+		/* rbd_osd_req_op_create(WRITE, offset, length) */
+		op->extent.offset = va_arg(args, u64);
+		op->extent.length = va_arg(args, u64);
+		if (opcode == CEPH_OSD_OP_WRITE)
+			op->payload_len = op->extent.length;
+		break;
+	case CEPH_OSD_OP_CALL:
+		/* rbd_osd_req_op_create(CALL, class, method, data, datalen) */
+		op->cls.class_name = va_arg(args, char *);
+		size = strlen(op->cls.class_name);
+		rbd_assert(size <= (size_t) U8_MAX);
+		op->cls.class_len = size;
+		op->payload_len = size;
+
+		op->cls.method_name = va_arg(args, char *);
+		size = strlen(op->cls.method_name);
+		rbd_assert(size <= (size_t) U8_MAX);
+		op->cls.method_len = size;
+		op->payload_len += size;
+
+		op->cls.argc = 0;
+		op->cls.indata = va_arg(args, void *);
+		size = va_arg(args, size_t);
+		rbd_assert(size <= (size_t) U32_MAX);
+		op->cls.indata_len = (u32) size;
+		op->payload_len += size;
+		break;
+	case CEPH_OSD_OP_NOTIFY_ACK:
+	case CEPH_OSD_OP_WATCH:
+		/* rbd_osd_req_op_create(NOTIFY_ACK, cookie, version) */
+		/* rbd_osd_req_op_create(WATCH, cookie, version, flag) */
+		op->watch.cookie = va_arg(args, u64);
+		op->watch.ver = va_arg(args, u64);
+		op->watch.ver = cpu_to_le64(op->watch.ver);
+		if (opcode == CEPH_OSD_OP_WATCH && va_arg(args, int))
+			op->watch.flag = (u8) 1;
+		break;
+	default:
+		rbd_warn(NULL, "unsupported opcode %hu\n", opcode);
+		kfree(op);
+		op = NULL;
+		break;
+	}
+	va_end(args);
 
-	ops[0].op = opcode;
-
-	/*
-	 * op extent offset and length will be set later on
-	 * in calc_raw_layout()
-	 */
-	ops[0].payload_len = payload_len;
-
-	return ops;
+	return op;
 }
 
-static void rbd_destroy_ops(struct ceph_osd_req_op *ops)
+static void rbd_osd_req_op_destroy(struct ceph_osd_req_op *op)
 {
-	kfree(ops);
+	kfree(op);
 }
 
 static void rbd_coll_end_req_index(struct request *rq,
 				   struct rbd_req_coll *coll,
 				   int index,
-				   int ret, u64 len)
+				   s32 ret, u64 len)
 {
 	struct request_queue *q;
 	int min, max, i;
 
 	dout("rbd_coll_end_req_index %p index %d ret %d len %llu\n",
-	     coll, index, ret, (unsigned long long) len);
+	     coll, index, (int)ret, (unsigned long long)len);
 
 	if (!rq)
 		return;
@@ -1034,7 +1129,7 @@ static void rbd_coll_end_req_index(struct request *rq,
 		max++;
 
 	for (i = min; i<max; i++) {
-		__blk_end_request(rq, coll->status[i].rc,
+		__blk_end_request(rq, (int)coll->status[i].rc,
 				  coll->status[i].bytes);
 		coll->num_done++;
 		kref_put(&coll->kref, rbd_coll_release);
@@ -1042,10 +1137,12 @@ static void rbd_coll_end_req_index(struct request *rq,
 	spin_unlock_irq(q->queue_lock);
 }
 
-static void rbd_coll_end_req(struct rbd_request *req,
-			     int ret, u64 len)
+static void rbd_coll_end_req(struct rbd_request *rbd_req,
+			     s32 ret, u64 len)
 {
-	rbd_coll_end_req_index(req->rq, req->coll, req->coll_index, ret, len);
+	rbd_coll_end_req_index(rbd_req->rq,
+				rbd_req->coll, rbd_req->coll_index,
+				ret, len);
 }
 
 /*
@@ -1060,117 +1157,102 @@ static int rbd_do_request(struct request *rq,
 			  struct page **pages,
 			  int num_pages,
 			  int flags,
-			  struct ceph_osd_req_op *ops,
+			  struct ceph_osd_req_op *op,
 			  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,
+			  void (*rbd_cb)(struct ceph_osd_request *,
+					 struct ceph_msg *),
 			  u64 *ver)
 {
-	struct ceph_osd_request *req;
-	struct ceph_file_layout *layout;
-	int ret;
-	u64 bno;
-	struct timespec mtime = CURRENT_TIME;
-	struct rbd_request *req_data;
-	struct ceph_osd_request_head *reqhead;
 	struct ceph_osd_client *osdc;
-
-	req_data = kzalloc(sizeof(*req_data), GFP_NOIO);
-	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;
-	}
+	struct ceph_osd_request *osd_req;
+	struct rbd_request *rbd_req = NULL;
+	struct timespec mtime = CURRENT_TIME;
+	int ret;
 
 	dout("rbd_do_request object_name=%s ofs=%llu len=%llu coll=%p[%d]\n",
 		object_name, (unsigned long long) ofs,
 		(unsigned long long) len, coll, coll_index);
 
 	osdc = &rbd_dev->rbd_client->client->osdc;
-	req = ceph_osdc_alloc_request(osdc, flags, snapc, ops,
-					false, GFP_NOIO, pages, bio);
-	if (!req) {
-		ret = -ENOMEM;
-		goto done_pages;
-	}
-
-	req->r_callback = rbd_cb;
+	osd_req = ceph_osdc_alloc_request(osdc, snapc, 1, false, GFP_NOIO);
+	if (!osd_req)
+		return -ENOMEM;
 
-	req_data->rq = rq;
-	req_data->bio = bio;
-	req_data->pages = pages;
-	req_data->len = len;
+	osd_req->r_flags = flags;
+	osd_req->r_pages = pages;
+	if (bio) {
+		osd_req->r_bio = bio;
+		bio_get(osd_req->r_bio);
+	}
 
-	req->r_priv = req_data;
+	if (coll) {
+		ret = -ENOMEM;
+		rbd_req = kmalloc(sizeof(*rbd_req), GFP_NOIO);
+		if (!rbd_req)
+			goto done_osd_req;
+
+		rbd_req->rq = rq;
+		rbd_req->bio = bio;
+		rbd_req->pages = pages;
+		rbd_req->len = len;
+		rbd_req->coll = coll;
+		rbd_req->coll_index = coll_index;
+	}
 
-	reqhead = req->r_request->front.iov_base;
-	reqhead->snapid = cpu_to_le64(CEPH_NOSNAP);
+	osd_req->r_callback = rbd_cb;
+	osd_req->r_priv = rbd_req;
 
-	strncpy(req->r_oid, object_name, sizeof(req->r_oid));
-	req->r_oid_len = strlen(req->r_oid);
+	strncpy(osd_req->r_oid, object_name, sizeof(osd_req->r_oid));
+	osd_req->r_oid_len = strlen(osd_req->r_oid);
 
-	layout = &req->r_file_layout;
-	memset(layout, 0, sizeof(*layout));
-	layout->fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
-	layout->fl_stripe_count = cpu_to_le32(1);
-	layout->fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
-	layout->fl_pg_pool = cpu_to_le32((int) rbd_dev->spec->pool_id);
-	ret = ceph_calc_raw_layout(osdc, layout, snapid, ofs, &len, &bno,
-				   req, ops);
-	rbd_assert(ret == 0);
+	osd_req->r_file_layout = rbd_dev->layout;	/* struct */
+	osd_req->r_num_pages = calc_pages_for(ofs, len);
+	osd_req->r_page_alignment = ofs & ~PAGE_MASK;
 
-	ceph_osdc_build_request(req, ofs, &len,
-				ops,
-				snapc,
-				&mtime,
-				req->r_oid, req->r_oid_len);
+	ceph_osdc_build_request(osd_req, ofs, len, 1, op,
+				snapc, snapid, &mtime);
 
-	if (linger_req) {
-		ceph_osdc_set_request_linger(osdc, req);
-		*linger_req = req;
+	if (op->op == CEPH_OSD_OP_WATCH && op->watch.flag) {
+		ceph_osdc_set_request_linger(osdc, osd_req);
+		rbd_dev->watch_request = osd_req;
 	}
 
-	ret = ceph_osdc_start_request(osdc, req, false);
+	ret = ceph_osdc_start_request(osdc, osd_req, false);
 	if (ret < 0)
 		goto done_err;
 
 	if (!rbd_cb) {
-		ret = ceph_osdc_wait_request(osdc, req);
+		u64 version;
+
+		ret = ceph_osdc_wait_request(osdc, osd_req);
+		version = le64_to_cpu(osd_req->r_reassert_version.version);
 		if (ver)
-			*ver = le64_to_cpu(req->r_reassert_version.version);
-		dout("reassert_ver=%llu\n",
-			(unsigned long long)
-				le64_to_cpu(req->r_reassert_version.version));
-		ceph_osdc_put_request(req);
+			*ver = version;
+		dout("reassert_ver=%llu\n", (unsigned long long) version);
+		ceph_osdc_put_request(osd_req);
 	}
 	return ret;
 
 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);
+	if (bio)
+		bio_chain_put(osd_req->r_bio);
+	kfree(rbd_req);
+done_osd_req:
+	ceph_osdc_put_request(osd_req);
+
 	return ret;
 }
 
 /*
  * Ceph osd op callback
  */
-static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
+static void rbd_req_cb(struct ceph_osd_request *osd_req, struct ceph_msg *msg)
 {
-	struct rbd_request *req_data = req->r_priv;
+	struct rbd_request *rbd_req = osd_req->r_priv;
 	struct ceph_osd_reply_head *replyhead;
 	struct ceph_osd_op *op;
-	__s32 rc;
+	s32 rc;
 	u64 bytes;
 	int read_op;
 
@@ -1178,68 +1260,66 @@ static void rbd_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
 	replyhead = msg->front.iov_base;
 	WARN_ON(le32_to_cpu(replyhead->num_ops) == 0);
 	op = (void *)(replyhead + 1);
-	rc = le32_to_cpu(replyhead->result);
+	rc = (s32)le32_to_cpu(replyhead->result);
 	bytes = le64_to_cpu(op->extent.length);
 	read_op = (le16_to_cpu(op->op) == CEPH_OSD_OP_READ);
 
 	dout("rbd_req_cb bytes=%llu readop=%d rc=%d\n",
 		(unsigned long long) bytes, read_op, (int) rc);
 
-	if (rc == -ENOENT && read_op) {
-		zero_bio_chain(req_data->bio, 0);
+	if (rc == (s32)-ENOENT && read_op) {
+		zero_bio_chain(rbd_req->bio, 0);
 		rc = 0;
-	} else if (rc == 0 && read_op && bytes < req_data->len) {
-		zero_bio_chain(req_data->bio, bytes);
-		bytes = req_data->len;
+	} else if (rc == 0 && read_op && bytes < rbd_req->len) {
+		zero_bio_chain(rbd_req->bio, bytes);
+		bytes = rbd_req->len;
 	}
 
-	rbd_coll_end_req(req_data, rc, bytes);
+	rbd_coll_end_req(rbd_req, rc, bytes);
 
-	if (req_data->bio)
-		bio_chain_put(req_data->bio);
+	if (rbd_req->bio)
+		bio_chain_put(rbd_req->bio);
 
-	ceph_osdc_put_request(req);
-	kfree(req_data);
+	ceph_osdc_put_request(osd_req);
+	kfree(rbd_req);
 }
 
-static void rbd_simple_req_cb(struct ceph_osd_request *req, struct ceph_msg *msg)
+static void rbd_simple_req_cb(struct ceph_osd_request *osd_req,
+				struct ceph_msg *msg)
 {
-	ceph_osdc_put_request(req);
+	ceph_osdc_put_request(osd_req);
 }
 
 /*
  * Do a synchronous ceph osd operation
  */
 static int rbd_req_sync_op(struct rbd_device *rbd_dev,
-			   struct ceph_snap_context *snapc,
-			   u64 snapid,
 			   int flags,
-			   struct ceph_osd_req_op *ops,
+			   struct ceph_osd_req_op *op,
 			   const char *object_name,
 			   u64 ofs, u64 inbound_size,
 			   char *inbound,
-			   struct ceph_osd_request **linger_req,
 			   u64 *ver)
 {
 	int ret;
 	struct page **pages;
 	int num_pages;
 
-	rbd_assert(ops != NULL);
+	rbd_assert(op != NULL);
 
 	num_pages = calc_pages_for(ofs, inbound_size);
 	pages = ceph_alloc_page_vector(num_pages, GFP_KERNEL);
 	if (IS_ERR(pages))
 		return PTR_ERR(pages);
 
-	ret = rbd_do_request(NULL, rbd_dev, snapc, snapid,
+	ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP,
 			  object_name, ofs, inbound_size, NULL,
 			  pages, num_pages,
 			  flags,
-			  ops,
+			  op,
 			  NULL, 0,
 			  NULL,
-			  linger_req, ver);
+			  ver);
 	if (ret < 0)
 		goto done;
 
@@ -1262,12 +1342,11 @@ static int rbd_do_op(struct request *rq,
 		     struct rbd_req_coll *coll,
 		     int coll_index)
 {
-	char *seg_name;
+	const char *seg_name;
 	u64 seg_ofs;
 	u64 seg_len;
 	int ret;
-	struct ceph_osd_req_op *ops;
-	u32 payload_len;
+	struct ceph_osd_req_op *op;
 	int opcode;
 	int flags;
 	u64 snapid;
@@ -1282,18 +1361,16 @@ static int rbd_do_op(struct request *rq,
 		opcode = CEPH_OSD_OP_WRITE;
 		flags = CEPH_OSD_FLAG_WRITE|CEPH_OSD_FLAG_ONDISK;
 		snapid = CEPH_NOSNAP;
-		payload_len = seg_len;
 	} else {
 		opcode = CEPH_OSD_OP_READ;
 		flags = CEPH_OSD_FLAG_READ;
-		snapc = NULL;
+		rbd_assert(!snapc);
 		snapid = rbd_dev->spec->snap_id;
-		payload_len = 0;
 	}
 
 	ret = -ENOMEM;
-	ops = rbd_create_rw_ops(1, opcode, payload_len);
-	if (!ops)
+	op = rbd_osd_req_op_create(opcode, seg_ofs, seg_len);
+	if (!op)
 		goto done;
 
 	/* we've taken care of segment sizes earlier when we
@@ -1306,11 +1383,13 @@ static int rbd_do_op(struct request *rq,
 			     bio,
 			     NULL, 0,
 			     flags,
-			     ops,
+			     op,
 			     coll, coll_index,
-			     rbd_req_cb, 0, NULL);
-
-	rbd_destroy_ops(ops);
+			     rbd_req_cb, NULL);
+	if (ret < 0)
+		rbd_coll_end_req_index(rq, coll, coll_index,
+					(s32)ret, seg_len);
+	rbd_osd_req_op_destroy(op);
 done:
 	kfree(seg_name);
 	return ret;
@@ -1320,24 +1399,21 @@ done:
  * Request sync osd read
  */
 static int rbd_req_sync_read(struct rbd_device *rbd_dev,
-			  u64 snapid,
 			  const char *object_name,
 			  u64 ofs, u64 len,
 			  char *buf,
 			  u64 *ver)
 {
-	struct ceph_osd_req_op *ops;
+	struct ceph_osd_req_op *op;
 	int ret;
 
-	ops = rbd_create_rw_ops(1, CEPH_OSD_OP_READ, 0);
-	if (!ops)
+	op = rbd_osd_req_op_create(CEPH_OSD_OP_READ, ofs, len);
+	if (!op)
 		return -ENOMEM;
 
-	ret = rbd_req_sync_op(rbd_dev, NULL,
-			       snapid,
-			       CEPH_OSD_FLAG_READ,
-			       ops, object_name, ofs, len, buf, NULL, ver);
-	rbd_destroy_ops(ops);
+	ret = rbd_req_sync_op(rbd_dev, CEPH_OSD_FLAG_READ,
+			       op, object_name, ofs, len, buf, ver);
+	rbd_osd_req_op_destroy(op);
 
 	return ret;
 }
@@ -1349,26 +1425,23 @@ static int rbd_req_sync_notify_ack(struct rbd_device *rbd_dev,
 				   u64 ver,
 				   u64 notify_id)
 {
-	struct ceph_osd_req_op *ops;
+	struct ceph_osd_req_op *op;
 	int ret;
 
-	ops = rbd_create_rw_ops(1, CEPH_OSD_OP_NOTIFY_ACK, 0);
-	if (!ops)
+	op = rbd_osd_req_op_create(CEPH_OSD_OP_NOTIFY_ACK, notify_id, ver);
+	if (!op)
 		return -ENOMEM;
 
-	ops[0].watch.ver = cpu_to_le64(ver);
-	ops[0].watch.cookie = notify_id;
-	ops[0].watch.flag = 0;
-
 	ret = rbd_do_request(NULL, rbd_dev, NULL, CEPH_NOSNAP,
 			  rbd_dev->header_name, 0, 0, NULL,
 			  NULL, 0,
 			  CEPH_OSD_FLAG_READ,
-			  ops,
+			  op,
 			  NULL, 0,
-			  rbd_simple_req_cb, 0, NULL);
+			  rbd_simple_req_cb, NULL);
+
+	rbd_osd_req_op_destroy(op);
 
-	rbd_destroy_ops(ops);
 	return ret;
 }
 
@@ -1386,83 +1459,51 @@ static void rbd_watch_cb(u64 ver, u64 notify_id, u8 opcode, void *data)
 		(unsigned int) opcode);
 	rc = rbd_dev_refresh(rbd_dev, &hver);
 	if (rc)
-		pr_warning(RBD_DRV_NAME "%d got notification but failed to "
-			   " update snaps: %d\n", rbd_dev->major, rc);
+		rbd_warn(rbd_dev, "got notification but failed to "
+			   " update snaps: %d\n", rc);
 
 	rbd_req_sync_notify_ack(rbd_dev, hver, notify_id);
 }
 
 /*
- * Request sync osd watch
+ * Request sync osd watch/unwatch.  The value of "start" determines
+ * whether a watch request is being initiated or torn down.
  */
-static int rbd_req_sync_watch(struct rbd_device *rbd_dev)
+static int rbd_req_sync_watch(struct rbd_device *rbd_dev, int start)
 {
-	struct ceph_osd_req_op *ops;
-	struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
-	int ret;
+	struct ceph_osd_req_op *op;
+	int ret = 0;
 
-	ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
-	if (!ops)
-		return -ENOMEM;
+	rbd_assert(start ^ !!rbd_dev->watch_event);
+	rbd_assert(start ^ !!rbd_dev->watch_request);
 
-	ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0,
-				     (void *)rbd_dev, &rbd_dev->watch_event);
-	if (ret < 0)
-		goto fail;
+	if (start) {
+		struct ceph_osd_client *osdc;
 
-	ops[0].watch.ver = cpu_to_le64(rbd_dev->header.obj_version);
-	ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
-	ops[0].watch.flag = 1;
+		osdc = &rbd_dev->rbd_client->client->osdc;
+		ret = ceph_osdc_create_event(osdc, rbd_watch_cb, 0, rbd_dev,
+						&rbd_dev->watch_event);
+		if (ret < 0)
+			return ret;
+	}
 
-	ret = rbd_req_sync_op(rbd_dev, NULL,
-			      CEPH_NOSNAP,
+	op = rbd_osd_req_op_create(CEPH_OSD_OP_WATCH,
+				rbd_dev->watch_event->cookie,
+				rbd_dev->header.obj_version, start);
+	if (op)
+		ret = rbd_req_sync_op(rbd_dev,
 			      CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
-			      ops,
-			      rbd_dev->header_name,
-			      0, 0, NULL,
-			      &rbd_dev->watch_request, NULL);
+			      op, rbd_dev->header_name,
+			      0, 0, NULL, NULL);
 
-	if (ret < 0)
-		goto fail_event;
-
-	rbd_destroy_ops(ops);
-	return 0;
-
-fail_event:
-	ceph_osdc_cancel_event(rbd_dev->watch_event);
-	rbd_dev->watch_event = NULL;
-fail:
-	rbd_destroy_ops(ops);
-	return ret;
-}
-
-/*
- * Request sync osd unwatch
- */
-static int rbd_req_sync_unwatch(struct rbd_device *rbd_dev)
-{
-	struct ceph_osd_req_op *ops;
-	int ret;
-
-	ops = rbd_create_rw_ops(1, CEPH_OSD_OP_WATCH, 0);
-	if (!ops)
-		return -ENOMEM;
-
-	ops[0].watch.ver = 0;
-	ops[0].watch.cookie = cpu_to_le64(rbd_dev->watch_event->cookie);
-	ops[0].watch.flag = 0;
-
-	ret = rbd_req_sync_op(rbd_dev, NULL,
-			      CEPH_NOSNAP,
-			      CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
-			      ops,
-			      rbd_dev->header_name,
-			      0, 0, NULL, NULL, NULL);
+	/* Cancel the event if we're tearing down, or on error */
 
+	if (!start || !op || ret < 0) {
+		ceph_osdc_cancel_event(rbd_dev->watch_event);
+		rbd_dev->watch_event = NULL;
+	}
+	rbd_osd_req_op_destroy(op);
 
-	rbd_destroy_ops(ops);
-	ceph_osdc_cancel_event(rbd_dev->watch_event);
-	rbd_dev->watch_event = NULL;
 	return ret;
 }
 
@@ -1477,13 +1518,9 @@ static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
 			     size_t outbound_size,
 			     char *inbound,
 			     size_t inbound_size,
-			     int flags,
 			     u64 *ver)
 {
-	struct ceph_osd_req_op *ops;
-	int class_name_len = strlen(class_name);
-	int method_name_len = strlen(method_name);
-	int payload_size;
+	struct ceph_osd_req_op *op;
 	int ret;
 
 	/*
@@ -1494,26 +1531,16 @@ static int rbd_req_sync_exec(struct rbd_device *rbd_dev,
 	 * the perspective of the server side) in the OSD request
 	 * operation.
 	 */
-	payload_size = class_name_len + method_name_len + outbound_size;
-	ops = rbd_create_rw_ops(1, CEPH_OSD_OP_CALL, payload_size);
-	if (!ops)
+	op = rbd_osd_req_op_create(CEPH_OSD_OP_CALL, class_name,
+					method_name, outbound, outbound_size);
+	if (!op)
 		return -ENOMEM;
 
-	ops[0].cls.class_name = class_name;
-	ops[0].cls.class_len = (__u8) class_name_len;
-	ops[0].cls.method_name = method_name;
-	ops[0].cls.method_len = (__u8) method_name_len;
-	ops[0].cls.argc = 0;
-	ops[0].cls.indata = outbound;
-	ops[0].cls.indata_len = outbound_size;
-
-	ret = rbd_req_sync_op(rbd_dev, NULL,
-			       CEPH_NOSNAP,
-			       flags, ops,
+	ret = rbd_req_sync_op(rbd_dev, CEPH_OSD_FLAG_READ, op,
 			       object_name, 0, inbound_size, inbound,
-			       NULL, ver);
+			       ver);
 
-	rbd_destroy_ops(ops);
+	rbd_osd_req_op_destroy(op);
 
 	dout("cls_exec returned %d\n", ret);
 	return ret;
@@ -1533,113 +1560,123 @@ static struct rbd_req_coll *rbd_alloc_coll(int num_reqs)
 	return coll;
 }
 
+static int rbd_dev_do_request(struct request *rq,
+				struct rbd_device *rbd_dev,
+				struct ceph_snap_context *snapc,
+				u64 ofs, unsigned int size,
+				struct bio *bio_chain)
+{
+	int num_segs;
+	struct rbd_req_coll *coll;
+	unsigned int bio_offset;
+	int cur_seg = 0;
+
+	dout("%s 0x%x bytes at 0x%llx\n",
+		rq_data_dir(rq) == WRITE ? "write" : "read",
+		size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE);
+
+	num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size);
+	if (num_segs <= 0)
+		return num_segs;
+
+	coll = rbd_alloc_coll(num_segs);
+	if (!coll)
+		return -ENOMEM;
+
+	bio_offset = 0;
+	do {
+		u64 limit = rbd_segment_length(rbd_dev, ofs, size);
+		unsigned int clone_size;
+		struct bio *bio_clone;
+
+		BUG_ON(limit > (u64)UINT_MAX);
+		clone_size = (unsigned int)limit;
+		dout("bio_chain->bi_vcnt=%hu\n", bio_chain->bi_vcnt);
+
+		kref_get(&coll->kref);
+
+		/* Pass a cloned bio chain via an osd request */
+
+		bio_clone = bio_chain_clone_range(&bio_chain,
+					&bio_offset, clone_size,
+					GFP_ATOMIC);
+		if (bio_clone)
+			(void)rbd_do_op(rq, rbd_dev, snapc,
+					ofs, clone_size,
+					bio_clone, coll, cur_seg);
+		else
+			rbd_coll_end_req_index(rq, coll, cur_seg,
+						(s32)-ENOMEM,
+						clone_size);
+		size -= clone_size;
+		ofs += clone_size;
+
+		cur_seg++;
+	} while (size > 0);
+	kref_put(&coll->kref, rbd_coll_release);
+
+	return 0;
+}
+
 /*
  * block device queue callback
  */
 static void rbd_rq_fn(struct request_queue *q)
 {
 	struct rbd_device *rbd_dev = q->queuedata;
+	bool read_only = rbd_dev->mapping.read_only;
 	struct request *rq;
 
 	while ((rq = blk_fetch_request(q))) {
-		struct bio *bio;
-		bool do_write;
-		unsigned int size;
-		u64 ofs;
-		int num_segs, cur_seg = 0;
-		struct rbd_req_coll *coll;
-		struct ceph_snap_context *snapc;
-		unsigned int bio_offset;
+		struct ceph_snap_context *snapc = NULL;
+		unsigned int size = 0;
+		int result;
 
 		dout("fetched request\n");
 
-		/* filter out block requests we don't understand */
+		/* Filter out block requests we don't understand */
+
 		if ((rq->cmd_type != REQ_TYPE_FS)) {
 			__blk_end_request_all(rq, 0);
 			continue;
 		}
-
-		/* deduce our operation (read, write) */
-		do_write = (rq_data_dir(rq) == WRITE);
-		if (do_write && rbd_dev->mapping.read_only) {
-			__blk_end_request_all(rq, -EROFS);
-			continue;
-		}
-
 		spin_unlock_irq(q->queue_lock);
 
-		down_read(&rbd_dev->header_rwsem);
-
-		if (!rbd_dev->exists) {
-			rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
+		/* Write requests need a reference to the snapshot context */
+
+		if (rq_data_dir(rq) == WRITE) {
+			result = -EROFS;
+			if (read_only) /* Can't write to a read-only device */
+				goto out_end_request;
+
+			/*
+			 * Note that each osd request will take its
+			 * own reference to the snapshot context
+			 * supplied.  The reference we take here
+			 * just guarantees the one we provide stays
+			 * valid.
+			 */
+			down_read(&rbd_dev->header_rwsem);
+			snapc = ceph_get_snap_context(rbd_dev->header.snapc);
 			up_read(&rbd_dev->header_rwsem);
+			rbd_assert(snapc != NULL);
+		} else if (!atomic_read(&rbd_dev->exists)) {
+			rbd_assert(rbd_dev->spec->snap_id != CEPH_NOSNAP);
 			dout("request for non-existent snapshot");
-			spin_lock_irq(q->queue_lock);
-			__blk_end_request_all(rq, -ENXIO);
-			continue;
+			result = -ENXIO;
+			goto out_end_request;
 		}
 
-		snapc = ceph_get_snap_context(rbd_dev->header.snapc);
-
-		up_read(&rbd_dev->header_rwsem);
-
 		size = blk_rq_bytes(rq);
-		ofs = blk_rq_pos(rq) * SECTOR_SIZE;
-		bio = rq->bio;
-
-		dout("%s 0x%x bytes at 0x%llx\n",
-		     do_write ? "write" : "read",
-		     size, (unsigned long long) blk_rq_pos(rq) * SECTOR_SIZE);
-
-		num_segs = rbd_get_num_segments(&rbd_dev->header, ofs, size);
-		if (num_segs <= 0) {
-			spin_lock_irq(q->queue_lock);
-			__blk_end_request_all(rq, num_segs);
+		result = rbd_dev_do_request(rq, rbd_dev, snapc,
+				blk_rq_pos(rq) * SECTOR_SIZE,
+				size, rq->bio);
+out_end_request:
+		if (snapc)
 			ceph_put_snap_context(snapc);
-			continue;
-		}
-		coll = rbd_alloc_coll(num_segs);
-		if (!coll) {
-			spin_lock_irq(q->queue_lock);
-			__blk_end_request_all(rq, -ENOMEM);
-			ceph_put_snap_context(snapc);
-			continue;
-		}
-
-		bio_offset = 0;
-		do {
-			u64 limit = rbd_segment_length(rbd_dev, ofs, size);
-			unsigned int chain_size;
-			struct bio *bio_chain;
-
-			BUG_ON(limit > (u64) UINT_MAX);
-			chain_size = (unsigned int) limit;
-			dout("rq->bio->bi_vcnt=%hu\n", rq->bio->bi_vcnt);
-
-			kref_get(&coll->kref);
-
-			/* Pass a cloned bio chain via an osd request */
-
-			bio_chain = bio_chain_clone_range(&bio,
-						&bio_offset, chain_size,
-						GFP_ATOMIC);
-			if (bio_chain)
-				(void) rbd_do_op(rq, rbd_dev, snapc,
-						ofs, chain_size,
-						bio_chain, coll, cur_seg);
-			else
-				rbd_coll_end_req_index(rq, coll, cur_seg,
-						       -ENOMEM, chain_size);
-			size -= chain_size;
-			ofs += chain_size;
-
-			cur_seg++;
-		} while (size > 0);
-		kref_put(&coll->kref, rbd_coll_release);
-
 		spin_lock_irq(q->queue_lock);
-
-		ceph_put_snap_context(snapc);
+		if (!size || result < 0)
+			__blk_end_request_all(rq, result);
 	}
 }
 
@@ -1741,8 +1778,7 @@ rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version)
 		if (!ondisk)
 			return ERR_PTR(-ENOMEM);
 
-		ret = rbd_req_sync_read(rbd_dev, CEPH_NOSNAP,
-				       rbd_dev->header_name,
+		ret = rbd_req_sync_read(rbd_dev, rbd_dev->header_name,
 				       0, size,
 				       (char *) ondisk, version);
 
@@ -1750,15 +1786,13 @@ rbd_dev_v1_header_read(struct rbd_device *rbd_dev, u64 *version)
 			goto out_err;
 		if (WARN_ON((size_t) ret < size)) {
 			ret = -ENXIO;
-			pr_warning("short header read for image %s"
-					" (want %zd got %d)\n",
-				rbd_dev->spec->image_name, size, ret);
+			rbd_warn(rbd_dev, "short header read (want %zd got %d)",
+				size, ret);
 			goto out_err;
 		}
 		if (!rbd_dev_ondisk_valid(ondisk)) {
 			ret = -ENXIO;
-			pr_warning("invalid header for image %s\n",
-				rbd_dev->spec->image_name);
+			rbd_warn(rbd_dev, "invalid header");
 			goto out_err;
 		}
 
@@ -2243,6 +2277,7 @@ struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
 		return NULL;
 
 	spin_lock_init(&rbd_dev->lock);
+	atomic_set(&rbd_dev->exists, 0);
 	INIT_LIST_HEAD(&rbd_dev->node);
 	INIT_LIST_HEAD(&rbd_dev->snaps);
 	init_rwsem(&rbd_dev->header_rwsem);
@@ -2250,6 +2285,13 @@ struct rbd_device *rbd_dev_create(struct rbd_client *rbdc,
 	rbd_dev->spec = spec;
 	rbd_dev->rbd_client = rbdc;
 
+	/* Initialize the layout used for all rbd requests */
+
+	rbd_dev->layout.fl_stripe_unit = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
+	rbd_dev->layout.fl_stripe_count = cpu_to_le32(1);
+	rbd_dev->layout.fl_object_size = cpu_to_le32(1 << RBD_MAX_OBJ_ORDER);
+	rbd_dev->layout.fl_pg_pool = cpu_to_le32((u32) spec->pool_id);
+
 	return rbd_dev;
 }
 
@@ -2363,8 +2405,7 @@ static int _rbd_dev_v2_snap_size(struct rbd_device *rbd_dev, u64 snap_id,
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_size",
 				(char *) &snapid, sizeof (snapid),
-				(char *) &size_buf, sizeof (size_buf),
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) &size_buf, sizeof (size_buf), NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		return ret;
@@ -2399,8 +2440,7 @@ static int rbd_dev_v2_object_prefix(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_object_prefix",
 				NULL, 0,
-				reply_buf, RBD_OBJ_PREFIX_LEN_MAX,
-				CEPH_OSD_FLAG_READ, NULL);
+				reply_buf, RBD_OBJ_PREFIX_LEN_MAX, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -2439,7 +2479,7 @@ static int _rbd_dev_v2_snap_features(struct rbd_device *rbd_dev, u64 snap_id,
 				"rbd", "get_features",
 				(char *) &snapid, sizeof (snapid),
 				(char *) &features_buf, sizeof (features_buf),
-				CEPH_OSD_FLAG_READ, NULL);
+				NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		return ret;
@@ -2474,7 +2514,6 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
 	void *end;
 	char *image_id;
 	u64 overlap;
-	size_t len = 0;
 	int ret;
 
 	parent_spec = rbd_spec_alloc();
@@ -2495,8 +2534,7 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_parent",
 				(char *) &snapid, sizeof (snapid),
-				(char *) reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) reply_buf, size, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out_err;
@@ -2508,13 +2546,18 @@ static int rbd_dev_v2_parent_info(struct rbd_device *rbd_dev)
 	if (parent_spec->pool_id == CEPH_NOPOOL)
 		goto out;	/* No parent?  No problem. */
 
-	image_id = ceph_extract_encoded_string(&p, end, &len, GFP_KERNEL);
+	/* The ceph file layout needs to fit pool id in 32 bits */
+
+	ret = -EIO;
+	if (WARN_ON(parent_spec->pool_id > (u64) U32_MAX))
+		goto out;
+
+	image_id = ceph_extract_encoded_string(&p, end, NULL, GFP_KERNEL);
 	if (IS_ERR(image_id)) {
 		ret = PTR_ERR(image_id);
 		goto out_err;
 	}
 	parent_spec->image_id = image_id;
-	parent_spec->image_id_len = len;
 	ceph_decode_64_safe(&p, end, parent_spec->snap_id, out_err);
 	ceph_decode_64_safe(&p, end, overlap, out_err);
 
@@ -2544,15 +2587,15 @@ static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
 
 	rbd_assert(!rbd_dev->spec->image_name);
 
-	image_id_size = sizeof (__le32) + rbd_dev->spec->image_id_len;
+	len = strlen(rbd_dev->spec->image_id);
+	image_id_size = sizeof (__le32) + len;
 	image_id = kmalloc(image_id_size, GFP_KERNEL);
 	if (!image_id)
 		return NULL;
 
 	p = image_id;
 	end = (char *) image_id + image_id_size;
-	ceph_encode_string(&p, end, rbd_dev->spec->image_id,
-				(u32) rbd_dev->spec->image_id_len);
+	ceph_encode_string(&p, end, rbd_dev->spec->image_id, (u32) len);
 
 	size = sizeof (__le32) + RBD_IMAGE_NAME_LEN_MAX;
 	reply_buf = kmalloc(size, GFP_KERNEL);
@@ -2562,8 +2605,7 @@ static char *rbd_dev_image_name(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, RBD_DIRECTORY,
 				"rbd", "dir_get_name",
 				image_id, image_id_size,
-				(char *) reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				(char *) reply_buf, size, NULL);
 	if (ret < 0)
 		goto out;
 	p = reply_buf;
@@ -2602,8 +2644,11 @@ static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev)
 
 	osdc = &rbd_dev->rbd_client->client->osdc;
 	name = ceph_pg_pool_name_by_id(osdc->osdmap, rbd_dev->spec->pool_id);
-	if (!name)
-		return -EIO;	/* pool id too large (>= 2^31) */
+	if (!name) {
+		rbd_warn(rbd_dev, "there is no pool with id %llu",
+			rbd_dev->spec->pool_id);	/* Really a BUG() */
+		return -EIO;
+	}
 
 	rbd_dev->spec->pool_name = kstrdup(name, GFP_KERNEL);
 	if (!rbd_dev->spec->pool_name)
@@ -2612,19 +2657,17 @@ static int rbd_dev_probe_update_spec(struct rbd_device *rbd_dev)
 	/* Fetch the image name; tolerate failure here */
 
 	name = rbd_dev_image_name(rbd_dev);
-	if (name) {
-		rbd_dev->spec->image_name_len = strlen(name);
+	if (name)
 		rbd_dev->spec->image_name = (char *) name;
-	} else {
-		pr_warning(RBD_DRV_NAME "%d "
-			"unable to get image name for image id %s\n",
-			rbd_dev->major, rbd_dev->spec->image_id);
-	}
+	else
+		rbd_warn(rbd_dev, "unable to get image name");
 
 	/* Look up the snapshot name. */
 
 	name = rbd_snap_name(rbd_dev, rbd_dev->spec->snap_id);
 	if (!name) {
+		rbd_warn(rbd_dev, "no snapshot with id %llu",
+			rbd_dev->spec->snap_id);	/* Really a BUG() */
 		ret = -EIO;
 		goto out_err;
 	}
@@ -2668,8 +2711,7 @@ static int rbd_dev_v2_snap_context(struct rbd_device *rbd_dev, u64 *ver)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_snapcontext",
 				NULL, 0,
-				reply_buf, size,
-				CEPH_OSD_FLAG_READ, ver);
+				reply_buf, size, ver);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -2738,8 +2780,7 @@ static char *rbd_dev_v2_snap_name(struct rbd_device *rbd_dev, u32 which)
 	ret = rbd_req_sync_exec(rbd_dev, rbd_dev->header_name,
 				"rbd", "get_snapshot_name",
 				(char *) &snap_id, sizeof (snap_id),
-				reply_buf, size,
-				CEPH_OSD_FLAG_READ, NULL);
+				reply_buf, size, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -2766,7 +2807,7 @@ out:
 static char *rbd_dev_v2_snap_info(struct rbd_device *rbd_dev, u32 which,
 		u64 *snap_size, u64 *snap_features)
 {
-	__le64 snap_id;
+	u64 snap_id;
 	u8 order;
 	int ret;
 
@@ -2868,7 +2909,7 @@ static int rbd_dev_snaps_update(struct rbd_device *rbd_dev)
 			/* Existing snapshot not in the new snap context */
 
 			if (rbd_dev->spec->snap_id == snap->id)
-				rbd_dev->exists = false;
+				atomic_set(&rbd_dev->exists, 0);
 			rbd_remove_snap_dev(snap);
 			dout("%ssnap id %llu has been removed\n",
 				rbd_dev->spec->snap_id == snap->id ?
@@ -2983,22 +3024,6 @@ static void rbd_bus_del_dev(struct rbd_device *rbd_dev)
 	device_unregister(&rbd_dev->dev);
 }
 
-static int rbd_init_watch_dev(struct rbd_device *rbd_dev)
-{
-	int ret, rc;
-
-	do {
-		ret = rbd_req_sync_watch(rbd_dev);
-		if (ret == -ERANGE) {
-			rc = rbd_dev_refresh(rbd_dev, NULL);
-			if (rc < 0)
-				return rc;
-		}
-	} while (ret == -ERANGE);
-
-	return ret;
-}
-
 static atomic64_t rbd_dev_id_max = ATOMIC64_INIT(0);
 
 /*
@@ -3138,11 +3163,9 @@ static inline char *dup_token(const char **buf, size_t *lenp)
 	size_t len;
 
 	len = next_token(buf);
-	dup = kmalloc(len + 1, GFP_KERNEL);
+	dup = kmemdup(*buf, len + 1, GFP_KERNEL);
 	if (!dup)
 		return NULL;
-
-	memcpy(dup, *buf, len);
 	*(dup + len) = '\0';
 	*buf += len;
 
@@ -3210,8 +3233,10 @@ static int rbd_add_parse_args(const char *buf,
 	/* The first four tokens are required */
 
 	len = next_token(&buf);
-	if (!len)
-		return -EINVAL;	/* Missing monitor address(es) */
+	if (!len) {
+		rbd_warn(NULL, "no monitor address(es) provided");
+		return -EINVAL;
+	}
 	mon_addrs = buf;
 	mon_addrs_size = len + 1;
 	buf += len;
@@ -3220,8 +3245,10 @@ static int rbd_add_parse_args(const char *buf,
 	options = dup_token(&buf, NULL);
 	if (!options)
 		return -ENOMEM;
-	if (!*options)
-		goto out_err;	/* Missing options */
+	if (!*options) {
+		rbd_warn(NULL, "no options provided");
+		goto out_err;
+	}
 
 	spec = rbd_spec_alloc();
 	if (!spec)
@@ -3230,14 +3257,18 @@ static int rbd_add_parse_args(const char *buf,
 	spec->pool_name = dup_token(&buf, NULL);
 	if (!spec->pool_name)
 		goto out_mem;
-	if (!*spec->pool_name)
-		goto out_err;	/* Missing pool name */
+	if (!*spec->pool_name) {
+		rbd_warn(NULL, "no pool name provided");
+		goto out_err;
+	}
 
-	spec->image_name = dup_token(&buf, &spec->image_name_len);
+	spec->image_name = dup_token(&buf, NULL);
 	if (!spec->image_name)
 		goto out_mem;
-	if (!*spec->image_name)
-		goto out_err;	/* Missing image name */
+	if (!*spec->image_name) {
+		rbd_warn(NULL, "no image name provided");
+		goto out_err;
+	}
 
 	/*
 	 * Snapshot name is optional; default is to use "-"
@@ -3251,10 +3282,9 @@ static int rbd_add_parse_args(const char *buf,
 		ret = -ENAMETOOLONG;
 		goto out_err;
 	}
-	spec->snap_name = kmalloc(len + 1, GFP_KERNEL);
+	spec->snap_name = kmemdup(buf, len + 1, GFP_KERNEL);
 	if (!spec->snap_name)
 		goto out_mem;
-	memcpy(spec->snap_name, buf, len);
 	*(spec->snap_name + len) = '\0';
 
 	/* Initialize all rbd options to the defaults */
@@ -3323,7 +3353,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
 	 * First, see if the format 2 image id file exists, and if
 	 * so, get the image's persistent id from it.
 	 */
-	size = sizeof (RBD_ID_PREFIX) + rbd_dev->spec->image_name_len;
+	size = sizeof (RBD_ID_PREFIX) + strlen(rbd_dev->spec->image_name);
 	object_name = kmalloc(size, GFP_NOIO);
 	if (!object_name)
 		return -ENOMEM;
@@ -3342,8 +3372,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
 	ret = rbd_req_sync_exec(rbd_dev, object_name,
 				"rbd", "get_id",
 				NULL, 0,
-				response, RBD_IMAGE_ID_LEN_MAX,
-				CEPH_OSD_FLAG_READ, NULL);
+				response, RBD_IMAGE_ID_LEN_MAX, NULL);
 	dout("%s: rbd_req_sync_exec returned %d\n", __func__, ret);
 	if (ret < 0)
 		goto out;
@@ -3352,8 +3381,7 @@ static int rbd_dev_image_id(struct rbd_device *rbd_dev)
 	p = response;
 	rbd_dev->spec->image_id = ceph_extract_encoded_string(&p,
 						p + RBD_IMAGE_ID_LEN_MAX,
-						&rbd_dev->spec->image_id_len,
-						GFP_NOIO);
+						NULL, GFP_NOIO);
 	if (IS_ERR(rbd_dev->spec->image_id)) {
 		ret = PTR_ERR(rbd_dev->spec->image_id);
 		rbd_dev->spec->image_id = NULL;
@@ -3377,11 +3405,10 @@ static int rbd_dev_v1_probe(struct rbd_device *rbd_dev)
 	rbd_dev->spec->image_id = kstrdup("", GFP_KERNEL);
 	if (!rbd_dev->spec->image_id)
 		return -ENOMEM;
-	rbd_dev->spec->image_id_len = 0;
 
 	/* Record the header object name for this rbd image. */
 
-	size = rbd_dev->spec->image_name_len + sizeof (RBD_SUFFIX);
+	size = strlen(rbd_dev->spec->image_name) + sizeof (RBD_SUFFIX);
 	rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
 	if (!rbd_dev->header_name) {
 		ret = -ENOMEM;
@@ -3427,7 +3454,7 @@ static int rbd_dev_v2_probe(struct rbd_device *rbd_dev)
 	 * Image id was filled in by the caller.  Record the header
 	 * object name for this rbd image.
 	 */
-	size = sizeof (RBD_HEADER_PREFIX) + rbd_dev->spec->image_id_len;
+	size = sizeof (RBD_HEADER_PREFIX) + strlen(rbd_dev->spec->image_id);
 	rbd_dev->header_name = kmalloc(size, GFP_KERNEL);
 	if (!rbd_dev->header_name)
 		return -ENOMEM;
@@ -3542,7 +3569,7 @@ static int rbd_dev_probe_finish(struct rbd_device *rbd_dev)
 	if (ret)
 		goto err_out_bus;
 
-	ret = rbd_init_watch_dev(rbd_dev);
+	ret = rbd_req_sync_watch(rbd_dev, 1);
 	if (ret)
 		goto err_out_bus;
 
@@ -3638,6 +3665,13 @@ static ssize_t rbd_add(struct bus_type *bus,
 		goto err_out_client;
 	spec->pool_id = (u64) rc;
 
+	/* The ceph file layout needs to fit pool id in 32 bits */
+
+	if (WARN_ON(spec->pool_id > (u64) U32_MAX)) {
+		rc = -EIO;
+		goto err_out_client;
+	}
+
 	rbd_dev = rbd_dev_create(rbdc, spec);
 	if (!rbd_dev)
 		goto err_out_client;
@@ -3698,8 +3732,7 @@ static void rbd_dev_release(struct device *dev)
 						    rbd_dev->watch_request);
 	}
 	if (rbd_dev->watch_event)
-		rbd_req_sync_unwatch(rbd_dev);
-
+		rbd_req_sync_watch(rbd_dev, 0);
 
 	/* clean up and free blkdev */
 	rbd_free_disk(rbd_dev);
diff --git a/fs/ceph/caps.c b/fs/ceph/caps.c
index a1d9bb30c1b..1e1e02055a2 100644
--- a/fs/ceph/caps.c
+++ b/fs/ceph/caps.c
@@ -611,8 +611,16 @@ retry:
 
 	if (flags & CEPH_CAP_FLAG_AUTH)
 		ci->i_auth_cap = cap;
-	else if (ci->i_auth_cap == cap)
+	else if (ci->i_auth_cap == cap) {
 		ci->i_auth_cap = NULL;
+		spin_lock(&mdsc->cap_dirty_lock);
+		if (!list_empty(&ci->i_dirty_item)) {
+			dout(" moving %p to cap_dirty_migrating\n", inode);
+			list_move(&ci->i_dirty_item,
+				  &mdsc->cap_dirty_migrating);
+		}
+		spin_unlock(&mdsc->cap_dirty_lock);
+	}
 
 	dout("add_cap inode %p (%llx.%llx) cap %p %s now %s seq %d mds%d\n",
 	     inode, ceph_vinop(inode), cap, ceph_cap_string(issued),
@@ -1460,7 +1468,7 @@ void ceph_check_caps(struct ceph_inode_info *ci, int flags,
 	struct ceph_mds_client *mdsc = fsc->mdsc;
 	struct inode *inode = &ci->vfs_inode;
 	struct ceph_cap *cap;
-	int file_wanted, used;
+	int file_wanted, used, cap_used;
 	int took_snap_rwsem = 0;             /* true if mdsc->snap_rwsem held */
 	int issued, implemented, want, retain, revoking, flushing = 0;
 	int mds = -1;   /* keep track of how far we've gone through i_caps list
@@ -1563,9 +1571,14 @@ retry_locked:
 
 		/* NOTE: no side-effects allowed, until we take s_mutex */
 
+		cap_used = used;
+		if (ci->i_auth_cap && cap != ci->i_auth_cap)
+			cap_used &= ~ci->i_auth_cap->issued;
+
 		revoking = cap->implemented & ~cap->issued;
-		dout(" mds%d cap %p issued %s implemented %s revoking %s\n",
+		dout(" mds%d cap %p used %s issued %s implemented %s revoking %s\n",
 		     cap->mds, cap, ceph_cap_string(cap->issued),
+		     ceph_cap_string(cap_used),
 		     ceph_cap_string(cap->implemented),
 		     ceph_cap_string(revoking));
 
@@ -1593,7 +1606,7 @@ retry_locked:
 		}
 
 		/* completed revocation? going down and there are no caps? */
-		if (revoking && (revoking & used) == 0) {
+		if (revoking && (revoking & cap_used) == 0) {
 			dout("completed revocation of %s\n",
 			     ceph_cap_string(cap->implemented & ~cap->issued));
 			goto ack;
@@ -1670,8 +1683,8 @@ ack:
 		sent++;
 
 		/* __send_cap drops i_ceph_lock */
-		delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, used, want,
-				      retain, flushing, NULL);
+		delayed += __send_cap(mdsc, cap, CEPH_CAP_OP_UPDATE, cap_used,
+				      want, retain, flushing, NULL);
 		goto retry; /* retake i_ceph_lock and restart our cap scan. */
 	}
 
@@ -2416,7 +2429,9 @@ static void handle_cap_grant(struct inode *inode, struct ceph_mds_caps *grant,
 		dout("mds wanted %s -> %s\n",
 		     ceph_cap_string(le32_to_cpu(grant->wanted)),
 		     ceph_cap_string(wanted));
-		grant->wanted = cpu_to_le32(wanted);
+		/* imported cap may not have correct mds_wanted */
+		if (le32_to_cpu(grant->op) == CEPH_CAP_OP_IMPORT)
+			check_caps = 1;
 	}
 
 	cap->seq = seq;
@@ -2820,6 +2835,9 @@ void ceph_handle_caps(struct ceph_mds_session *session,
 	dout(" mds%d seq %lld cap seq %u\n", session->s_mds, session->s_seq,
 	     (unsigned)seq);
 
+	if (op == CEPH_CAP_OP_IMPORT)
+		ceph_add_cap_releases(mdsc, session);
+
 	/* lookup ino */
 	inode = ceph_find_inode(sb, vino);
 	ci = ceph_inode(inode);
diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index e51558fca3a..a1e5b81e811 100644
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -243,6 +243,9 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 	err = ceph_mdsc_do_request(mdsc,
 				   (flags & (O_CREAT|O_TRUNC)) ? dir : NULL,
 				   req);
+	if (err)
+		goto out_err;
+
 	err = ceph_handle_snapdir(req, dentry, err);
 	if (err == 0 && (flags & O_CREAT) && !req->r_reply_info.head->is_dentry)
 		err = ceph_handle_notrace_create(dir, dentry);
@@ -263,6 +266,9 @@ int ceph_atomic_open(struct inode *dir, struct dentry *dentry,
 		err = finish_no_open(file, dn);
 	} else {
 		dout("atomic_open finish_open on dn %p\n", dn);
+		if (req->r_op == CEPH_MDS_OP_CREATE && req->r_reply_info.has_create_ino) {
+			*opened |= FILE_CREATED;
+		}
 		err = finish_open(file, dentry, ceph_open, opened);
 	}
 
diff --git a/fs/ceph/ioctl.c b/fs/ceph/ioctl.c
index 36549a46e31..3b22150d3e1 100644
--- a/fs/ceph/ioctl.c
+++ b/fs/ceph/ioctl.c
@@ -194,7 +194,7 @@ static long ceph_ioctl_get_dataloc(struct file *file, void __user *arg)
 		return -EFAULT;
 
 	down_read(&osdc->map_sem);
-	r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, &len,
+	r = ceph_calc_file_object_mapping(&ci->i_layout, dl.file_offset, len,
 					  &dl.object_no, &dl.object_offset,
 					  &olen);
 	if (r < 0)
diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
index 9165eb8309e..d95842036c8 100644
--- a/fs/ceph/mds_client.c
+++ b/fs/ceph/mds_client.c
@@ -233,6 +233,30 @@ bad:
 }
 
 /*
+ * parse create results
+ */
+static int parse_reply_info_create(void **p, void *end,
+				  struct ceph_mds_reply_info_parsed *info,
+				  int features)
+{
+	if (features & CEPH_FEATURE_REPLY_CREATE_INODE) {
+		if (*p == end) {
+			info->has_create_ino = false;
+		} else {
+			info->has_create_ino = true;
+			info->ino = ceph_decode_64(p);
+		}
+	}
+
+	if (unlikely(*p != end))
+		goto bad;
+	return 0;
+
+bad:
+	return -EIO;
+}
+
+/*
  * parse extra results
  */
 static int parse_reply_info_extra(void **p, void *end,
@@ -241,8 +265,12 @@ static int parse_reply_info_extra(void **p, void *end,
 {
 	if (info->head->op == CEPH_MDS_OP_GETFILELOCK)
 		return parse_reply_info_filelock(p, end, info, features);
-	else
+	else if (info->head->op == CEPH_MDS_OP_READDIR)
 		return parse_reply_info_dir(p, end, info, features);
+	else if (info->head->op == CEPH_MDS_OP_CREATE)
+		return parse_reply_info_create(p, end, info, features);
+	else
+		return -EIO;
 }
 
 /*
@@ -2170,7 +2198,8 @@ static void handle_reply(struct ceph_mds_session *session, struct ceph_msg *msg)
 	mutex_lock(&req->r_fill_mutex);
 	err = ceph_fill_trace(mdsc->fsc->sb, req, req->r_session);
 	if (err == 0) {
-		if (result == 0 && req->r_op != CEPH_MDS_OP_GETFILELOCK &&
+		if (result == 0 && (req->r_op == CEPH_MDS_OP_READDIR ||
+				    req->r_op == CEPH_MDS_OP_LSSNAP) &&
 		    rinfo->dir_nr)
 			ceph_readdir_prepopulate(req, req->r_session);
 		ceph_unreserve_caps(mdsc, &req->r_caps_reservation);
diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h
index dd26846dd71..567f7c60354 100644
--- a/fs/ceph/mds_client.h
+++ b/fs/ceph/mds_client.h
@@ -74,6 +74,12 @@ struct ceph_mds_reply_info_parsed {
 			struct ceph_mds_reply_info_in *dir_in;
 			u8                            dir_complete, dir_end;
 		};
+
+		/* for create results */
+		struct {
+			bool has_create_ino;
+			u64 ino;
+		};
 	};
 
 	/* encoded blob describing snapshot contexts for certain
diff --git a/include/linux/ceph/ceph_features.h b/include/linux/ceph/ceph_features.h
index dad579b0c0e..2160aab482f 100644
--- a/include/linux/ceph/ceph_features.h
+++ b/include/linux/ceph/ceph_features.h
@@ -14,13 +14,19 @@
 #define CEPH_FEATURE_DIRLAYOUTHASH  (1<<7)
 /* bits 8-17 defined by user-space; not supported yet here */
 #define CEPH_FEATURE_CRUSH_TUNABLES (1<<18)
+/* bits 19-24 defined by user-space; not supported yet here */
+#define CEPH_FEATURE_CRUSH_TUNABLES2 (1<<25)
+/* bit 26 defined by user-space; not supported yet here */
+#define CEPH_FEATURE_REPLY_CREATE_INODE (1<<27)
 
 /*
  * Features supported.
  */
 #define CEPH_FEATURES_SUPPORTED_DEFAULT  \
 	(CEPH_FEATURE_NOSRCADDR |	 \
-	 CEPH_FEATURE_CRUSH_TUNABLES)
+	 CEPH_FEATURE_CRUSH_TUNABLES |	  \
+	 CEPH_FEATURE_CRUSH_TUNABLES2 |   \
+	 CEPH_FEATURE_REPLY_CREATE_INODE)
 
 #define CEPH_FEATURES_REQUIRED_DEFAULT   \
 	(CEPH_FEATURE_NOSRCADDR)
diff --git a/include/linux/ceph/decode.h b/include/linux/ceph/decode.h
index 63d092822ba..360d9d08ca9 100644
--- a/include/linux/ceph/decode.h
+++ b/include/linux/ceph/decode.h
@@ -52,10 +52,10 @@ static inline int ceph_has_room(void **p, void *end, size_t n)
 	return end >= *p && n <= end - *p;
 }
 
-#define ceph_decode_need(p, end, n, bad)		\
-	do {						\
-		if (!likely(ceph_has_room(p, end, n)))	\
-			goto bad;			\
+#define ceph_decode_need(p, end, n, bad)			\
+	do {							\
+		if (!likely(ceph_has_room(p, end, n)))		\
+			goto bad;				\
 	} while (0)
 
 #define ceph_decode_64_safe(p, end, v, bad)			\
@@ -99,8 +99,8 @@ static inline int ceph_has_room(void **p, void *end, size_t n)
  *
  * There are two possible failures:
  *   - converting the string would require accessing memory at or
- *     beyond the "end" pointer provided (-E
- *   - memory could not be allocated for the result
+ *     beyond the "end" pointer provided (-ERANGE)
+ *   - memory could not be allocated for the result (-ENOMEM)
  */
 static inline char *ceph_extract_encoded_string(void **p, void *end,
 						size_t *lenp, gfp_t gfp)
@@ -217,10 +217,10 @@ static inline void ceph_encode_string(void **p, void *end,
 	*p += len;
 }
 
-#define ceph_encode_need(p, end, n, bad)		\
-	do {						\
-		if (!likely(ceph_has_room(p, end, n)))	\
-			goto bad;			\
+#define ceph_encode_need(p, end, n, bad)			\
+	do {							\
+		if (!likely(ceph_has_room(p, end, n)))		\
+			goto bad;				\
 	} while (0)
 
 #define ceph_encode_64_safe(p, end, v, bad)			\
@@ -231,12 +231,17 @@ static inline void ceph_encode_string(void **p, void *end,
 #define ceph_encode_32_safe(p, end, v, bad)			\
 	do {							\
 		ceph_encode_need(p, end, sizeof(u32), bad);	\
-		ceph_encode_32(p, v);			\
+		ceph_encode_32(p, v);				\
 	} while (0)
 #define ceph_encode_16_safe(p, end, v, bad)			\
 	do {							\
 		ceph_encode_need(p, end, sizeof(u16), bad);	\
-		ceph_encode_16(p, v);			\
+		ceph_encode_16(p, v);				\
+	} while (0)
+#define ceph_encode_8_safe(p, end, v, bad)			\
+	do {							\
+		ceph_encode_need(p, end, sizeof(u8), bad);	\
+		ceph_encode_8(p, v);				\
 	} while (0)
 
 #define ceph_encode_copy_safe(p, end, pv, n, bad)		\
diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index d9b880e977e..69287ccfe68 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -10,6 +10,7 @@
 #include <linux/ceph/osdmap.h>
 #include <linux/ceph/messenger.h>
 #include <linux/ceph/auth.h>
+#include <linux/ceph/pagelist.h>
 
 /* 
  * Maximum object name size 
@@ -22,7 +23,6 @@ struct ceph_snap_context;
 struct ceph_osd_request;
 struct ceph_osd_client;
 struct ceph_authorizer;
-struct ceph_pagelist;
 
 /*
  * completion callback for async writepages
@@ -95,7 +95,7 @@ struct ceph_osd_request {
 	struct bio       *r_bio;	      /* instead of pages */
 #endif
 
-	struct ceph_pagelist *r_trail;	      /* trailing part of the data */
+	struct ceph_pagelist r_trail;	      /* trailing part of the data */
 };
 
 struct ceph_osd_event {
@@ -157,7 +157,6 @@ struct ceph_osd_client {
 
 struct ceph_osd_req_op {
 	u16 op;           /* CEPH_OSD_OP_* */
-	u32 flags;        /* CEPH_OSD_FLAG_* */
 	union {
 		struct {
 			u64 offset, length;
@@ -207,29 +206,24 @@ extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
 extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
 				 struct ceph_msg *msg);
 
-extern int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
-			struct ceph_file_layout *layout,
-			u64 snapid,
+extern int ceph_calc_raw_layout(struct ceph_file_layout *layout,
 			u64 off, u64 *plen, u64 *bno,
 			struct ceph_osd_request *req,
 			struct ceph_osd_req_op *op);
 
 extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
-					       int flags,
 					       struct ceph_snap_context *snapc,
-					       struct ceph_osd_req_op *ops,
+					       unsigned int num_op,
 					       bool use_mempool,
-					       gfp_t gfp_flags,
-					       struct page **pages,
-					       struct bio *bio);
+					       gfp_t gfp_flags);
 
 extern void ceph_osdc_build_request(struct ceph_osd_request *req,
-				    u64 off, u64 *plen,
+				    u64 off, u64 len,
+				    unsigned int num_op,
 				    struct ceph_osd_req_op *src_ops,
 				    struct ceph_snap_context *snapc,
-				    struct timespec *mtime,
-				    const char *oid,
-				    int oid_len);
+				    u64 snap_id,
+				    struct timespec *mtime);
 
 extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
 				      struct ceph_file_layout *layout,
diff --git a/include/linux/ceph/osdmap.h b/include/linux/ceph/osdmap.h
index 10a417f9f76..c83a838f89f 100644
--- a/include/linux/ceph/osdmap.h
+++ b/include/linux/ceph/osdmap.h
@@ -110,7 +110,7 @@ extern void ceph_osdmap_destroy(struct ceph_osdmap *map);
 
 /* calculate mapping of a file extent to an object */
 extern int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
-					 u64 off, u64 *plen,
+					 u64 off, u64 len,
 					 u64 *bno, u64 *oxoff, u64 *oxlen);
 
 /* calculate mapping of object to a placement group */
diff --git a/include/linux/crush/crush.h b/include/linux/crush/crush.h
index 25baa287cff..6a1101f24cf 100644
--- a/include/linux/crush/crush.h
+++ b/include/linux/crush/crush.h
@@ -162,6 +162,8 @@ struct crush_map {
 	__u32 choose_local_fallback_tries;
 	/* choose attempts before giving up */ 
 	__u32 choose_total_tries;
+	/* attempt chooseleaf inner descent once; on failure retry outer descent */
+	__u32 chooseleaf_descend_once;
 };
 
 
diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index 35fce755ce1..cbd06a91941 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -287,6 +287,7 @@ static int is_out(const struct crush_map *map, const __u32 *weight, int item, in
  * @outpos: our position in that vector
  * @firstn: true if choosing "first n" items, false if choosing "indep"
  * @recurse_to_leaf: true if we want one device under each item of given type
+ * @descend_once: true if we should only try one descent before giving up
  * @out2: second output vector for leaf items (if @recurse_to_leaf)
  */
 static int crush_choose(const struct crush_map *map,
@@ -295,7 +296,7 @@ static int crush_choose(const struct crush_map *map,
 			int x, int numrep, int type,
 			int *out, int outpos,
 			int firstn, int recurse_to_leaf,
-			int *out2)
+			int descend_once, int *out2)
 {
 	int rep;
 	unsigned int ftotal, flocal;
@@ -391,7 +392,7 @@ static int crush_choose(const struct crush_map *map,
 				}
 
 				reject = 0;
-				if (recurse_to_leaf) {
+				if (!collide && recurse_to_leaf) {
 					if (item < 0) {
 						if (crush_choose(map,
 							 map->buckets[-1-item],
@@ -399,6 +400,7 @@ static int crush_choose(const struct crush_map *map,
 							 x, outpos+1, 0,
 							 out2, outpos,
 							 firstn, 0,
+							 map->chooseleaf_descend_once,
 							 NULL) <= outpos)
 							/* didn't get leaf */
 							reject = 1;
@@ -422,7 +424,10 @@ reject:
 					ftotal++;
 					flocal++;
 
-					if (collide && flocal <= map->choose_local_tries)
+					if (reject && descend_once)
+						/* let outer call try again */
+						skip_rep = 1;
+					else if (collide && flocal <= map->choose_local_tries)
 						/* retry locally a few times */
 						retry_bucket = 1;
 					else if (map->choose_local_fallback_tries > 0 &&
@@ -485,6 +490,7 @@ int crush_do_rule(const struct crush_map *map,
 	int i, j;
 	int numrep;
 	int firstn;
+	const int descend_once = 0;
 
 	if ((__u32)ruleno >= map->max_rules) {
 		dprintk(" bad ruleno %d\n", ruleno);
@@ -544,7 +550,8 @@ int crush_do_rule(const struct crush_map *map,
 						      curstep->arg2,
 						      o+osize, j,
 						      firstn,
-						      recurse_to_leaf, c+osize);
+						      recurse_to_leaf,
+						      descend_once, c+osize);
 			}
 
 			if (recurse_to_leaf)
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index eb9a4447876..500ae8b4932 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -32,52 +32,43 @@ static void __unregister_linger_request(struct ceph_osd_client *osdc,
 static void __send_request(struct ceph_osd_client *osdc,
 			   struct ceph_osd_request *req);
 
-static int op_needs_trail(int op)
-{
-	switch (op) {
-	case CEPH_OSD_OP_GETXATTR:
-	case CEPH_OSD_OP_SETXATTR:
-	case CEPH_OSD_OP_CMPXATTR:
-	case CEPH_OSD_OP_CALL:
-	case CEPH_OSD_OP_NOTIFY:
-		return 1;
-	default:
-		return 0;
-	}
-}
-
 static int op_has_extent(int op)
 {
 	return (op == CEPH_OSD_OP_READ ||
 		op == CEPH_OSD_OP_WRITE);
 }
 
-int ceph_calc_raw_layout(struct ceph_osd_client *osdc,
-			struct ceph_file_layout *layout,
-			u64 snapid,
+int ceph_calc_raw_layout(struct ceph_file_layout *layout,
 			u64 off, u64 *plen, u64 *bno,
 			struct ceph_osd_request *req,
 			struct ceph_osd_req_op *op)
 {
-	struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
 	u64 orig_len = *plen;
 	u64 objoff, objlen;    /* extent in object */
 	int r;
 
-	reqhead->snapid = cpu_to_le64(snapid);
-
 	/* object extent? */
-	r = ceph_calc_file_object_mapping(layout, off, plen, bno,
+	r = ceph_calc_file_object_mapping(layout, off, orig_len, bno,
 					  &objoff, &objlen);
 	if (r < 0)
 		return r;
-	if (*plen < orig_len)
+	if (objlen < orig_len) {
+		*plen = objlen;
 		dout(" skipping last %llu, final file extent %llu~%llu\n",
 		     orig_len - *plen, off, *plen);
+	}
 
 	if (op_has_extent(op->op)) {
+		u32 osize = le32_to_cpu(layout->fl_object_size);
 		op->extent.offset = objoff;
 		op->extent.length = objlen;
+		if (op->extent.truncate_size <= off - objoff) {
+			op->extent.truncate_size = 0;
+		} else {
+			op->extent.truncate_size -= off - objoff;
+			if (op->extent.truncate_size > osize)
+				op->extent.truncate_size = osize;
+		}
 	}
 	req->r_num_pages = calc_pages_for(off, *plen);
 	req->r_page_alignment = off & ~PAGE_MASK;
@@ -115,8 +106,7 @@ EXPORT_SYMBOL(ceph_calc_raw_layout);
  *
  * fill osd op in request message.
  */
-static int calc_layout(struct ceph_osd_client *osdc,
-		       struct ceph_vino vino,
+static int calc_layout(struct ceph_vino vino,
 		       struct ceph_file_layout *layout,
 		       u64 off, u64 *plen,
 		       struct ceph_osd_request *req,
@@ -125,8 +115,7 @@ static int calc_layout(struct ceph_osd_client *osdc,
 	u64 bno;
 	int r;
 
-	r = ceph_calc_raw_layout(osdc, layout, vino.snap, off,
-				 plen, &bno, req, op);
+	r = ceph_calc_raw_layout(layout, off, plen, &bno, req, op);
 	if (r < 0)
 		return r;
 
@@ -163,10 +152,7 @@ void ceph_osdc_release_request(struct kref *kref)
 		bio_put(req->r_bio);
 #endif
 	ceph_put_snap_context(req->r_snapc);
-	if (req->r_trail) {
-		ceph_pagelist_release(req->r_trail);
-		kfree(req->r_trail);
-	}
+	ceph_pagelist_release(&req->r_trail);
 	if (req->r_mempool)
 		mempool_free(req, req->r_osdc->req_mempool);
 	else
@@ -174,34 +160,14 @@ void ceph_osdc_release_request(struct kref *kref)
 }
 EXPORT_SYMBOL(ceph_osdc_release_request);
 
-static int get_num_ops(struct ceph_osd_req_op *ops, int *needs_trail)
-{
-	int i = 0;
-
-	if (needs_trail)
-		*needs_trail = 0;
-	while (ops[i].op) {
-		if (needs_trail && op_needs_trail(ops[i].op))
-			*needs_trail = 1;
-		i++;
-	}
-
-	return i;
-}
-
 struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
-					       int flags,
 					       struct ceph_snap_context *snapc,
-					       struct ceph_osd_req_op *ops,
+					       unsigned int num_op,
 					       bool use_mempool,
-					       gfp_t gfp_flags,
-					       struct page **pages,
-					       struct bio *bio)
+					       gfp_t gfp_flags)
 {
 	struct ceph_osd_request *req;
 	struct ceph_msg *msg;
-	int needs_trail;
-	int num_op = get_num_ops(ops, &needs_trail);
 	size_t msg_size = sizeof(struct ceph_osd_request_head);
 
 	msg_size += num_op*sizeof(struct ceph_osd_op);
@@ -228,10 +194,6 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 	INIT_LIST_HEAD(&req->r_req_lru_item);
 	INIT_LIST_HEAD(&req->r_osd_item);
 
-	req->r_flags = flags;
-
-	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
-
 	/* create reply message */
 	if (use_mempool)
 		msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
@@ -244,15 +206,7 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 	}
 	req->r_reply = msg;
 
-	/* allocate space for the trailing data */
-	if (needs_trail) {
-		req->r_trail = kmalloc(sizeof(struct ceph_pagelist), gfp_flags);
-		if (!req->r_trail) {
-			ceph_osdc_put_request(req);
-			return NULL;
-		}
-		ceph_pagelist_init(req->r_trail);
-	}
+	ceph_pagelist_init(&req->r_trail);
 
 	/* create request message; allow space for oid */
 	msg_size += MAX_OBJ_NAME_SIZE;
@@ -270,13 +224,6 @@ struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
 	memset(msg->front.iov_base, 0, msg->front.iov_len);
 
 	req->r_request = msg;
-	req->r_pages = pages;
-#ifdef CONFIG_BLOCK
-	if (bio) {
-		req->r_bio = bio;
-		bio_get(req->r_bio);
-	}
-#endif
 
 	return req;
 }
@@ -304,29 +251,25 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
 	case CEPH_OSD_OP_GETXATTR:
 	case CEPH_OSD_OP_SETXATTR:
 	case CEPH_OSD_OP_CMPXATTR:
-		BUG_ON(!req->r_trail);
-
 		dst->xattr.name_len = cpu_to_le32(src->xattr.name_len);
 		dst->xattr.value_len = cpu_to_le32(src->xattr.value_len);
 		dst->xattr.cmp_op = src->xattr.cmp_op;
 		dst->xattr.cmp_mode = src->xattr.cmp_mode;
-		ceph_pagelist_append(req->r_trail, src->xattr.name,
+		ceph_pagelist_append(&req->r_trail, src->xattr.name,
 				     src->xattr.name_len);
-		ceph_pagelist_append(req->r_trail, src->xattr.val,
+		ceph_pagelist_append(&req->r_trail, src->xattr.val,
 				     src->xattr.value_len);
 		break;
 	case CEPH_OSD_OP_CALL:
-		BUG_ON(!req->r_trail);
-
 		dst->cls.class_len = src->cls.class_len;
 		dst->cls.method_len = src->cls.method_len;
 		dst->cls.indata_len = cpu_to_le32(src->cls.indata_len);
 
-		ceph_pagelist_append(req->r_trail, src->cls.class_name,
+		ceph_pagelist_append(&req->r_trail, src->cls.class_name,
 				     src->cls.class_len);
-		ceph_pagelist_append(req->r_trail, src->cls.method_name,
+		ceph_pagelist_append(&req->r_trail, src->cls.method_name,
 				     src->cls.method_len);
-		ceph_pagelist_append(req->r_trail, src->cls.indata,
+		ceph_pagelist_append(&req->r_trail, src->cls.indata,
 				     src->cls.indata_len);
 		break;
 	case CEPH_OSD_OP_ROLLBACK:
@@ -339,11 +282,9 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
 			__le32 prot_ver = cpu_to_le32(src->watch.prot_ver);
 			__le32 timeout = cpu_to_le32(src->watch.timeout);
 
-			BUG_ON(!req->r_trail);
-
-			ceph_pagelist_append(req->r_trail,
+			ceph_pagelist_append(&req->r_trail,
 						&prot_ver, sizeof(prot_ver));
-			ceph_pagelist_append(req->r_trail,
+			ceph_pagelist_append(&req->r_trail,
 						&timeout, sizeof(timeout));
 		}
 	case CEPH_OSD_OP_NOTIFY_ACK:
@@ -365,25 +306,25 @@ static void osd_req_encode_op(struct ceph_osd_request *req,
  *
  */
 void ceph_osdc_build_request(struct ceph_osd_request *req,
-			     u64 off, u64 *plen,
+			     u64 off, u64 len, unsigned int num_op,
 			     struct ceph_osd_req_op *src_ops,
-			     struct ceph_snap_context *snapc,
-			     struct timespec *mtime,
-			     const char *oid,
-			     int oid_len)
+			     struct ceph_snap_context *snapc, u64 snap_id,
+			     struct timespec *mtime)
 {
 	struct ceph_msg *msg = req->r_request;
 	struct ceph_osd_request_head *head;
 	struct ceph_osd_req_op *src_op;
 	struct ceph_osd_op *op;
 	void *p;
-	int num_op = get_num_ops(src_ops, NULL);
 	size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
 	int flags = req->r_flags;
 	u64 data_len = 0;
 	int i;
 
+	WARN_ON((flags & (CEPH_OSD_FLAG_READ|CEPH_OSD_FLAG_WRITE)) == 0);
+
 	head = msg->front.iov_base;
+	head->snapid = cpu_to_le64(snap_id);
 	op = (void *)(head + 1);
 	p = (void *)(op + num_op);
 
@@ -393,23 +334,19 @@ void ceph_osdc_build_request(struct ceph_osd_request *req,
 	head->flags = cpu_to_le32(flags);
 	if (flags & CEPH_OSD_FLAG_WRITE)
 		ceph_encode_timespec(&head->mtime, mtime);
+	BUG_ON(num_op > (unsigned int) ((u16) -1));
 	head->num_ops = cpu_to_le16(num_op);
 
-
 	/* fill in oid */
-	head->object_len = cpu_to_le32(oid_len);
-	memcpy(p, oid, oid_len);
-	p += oid_len;
+	head->object_len = cpu_to_le32(req->r_oid_len);
+	memcpy(p, req->r_oid, req->r_oid_len);
+	p += req->r_oid_len;
 
 	src_op = src_ops;
-	while (src_op->op) {
-		osd_req_encode_op(req, op, src_op);
-		src_op++;
-		op++;
-	}
+	while (num_op--)
+		osd_req_encode_op(req, op++, src_op++);
 
-	if (req->r_trail)
-		data_len += req->r_trail->length;
+	data_len += req->r_trail.length;
 
 	if (snapc) {
 		head->snap_seq = cpu_to_le64(snapc->seq);
@@ -422,7 +359,7 @@ void ceph_osdc_build_request(struct ceph_osd_request *req,
 
 	if (flags & CEPH_OSD_FLAG_WRITE) {
 		req->r_request->hdr.data_off = cpu_to_le16(off);
-		req->r_request->hdr.data_len = cpu_to_le32(*plen + data_len);
+		req->r_request->hdr.data_len = cpu_to_le32(len + data_len);
 	} else if (data_len) {
 		req->r_request->hdr.data_off = 0;
 		req->r_request->hdr.data_len = cpu_to_le32(data_len);
@@ -462,31 +399,30 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 					       bool use_mempool, int num_reply,
 					       int page_align)
 {
-	struct ceph_osd_req_op ops[3];
+	struct ceph_osd_req_op ops[2];
 	struct ceph_osd_request *req;
+	unsigned int num_op = 1;
 	int r;
 
+	memset(&ops, 0, sizeof ops);
+
 	ops[0].op = opcode;
 	ops[0].extent.truncate_seq = truncate_seq;
 	ops[0].extent.truncate_size = truncate_size;
-	ops[0].payload_len = 0;
 
 	if (do_sync) {
 		ops[1].op = CEPH_OSD_OP_STARTSYNC;
-		ops[1].payload_len = 0;
-		ops[2].op = 0;
-	} else
-		ops[1].op = 0;
-
-	req = ceph_osdc_alloc_request(osdc, flags,
-					 snapc, ops,
-					 use_mempool,
-					 GFP_NOFS, NULL, NULL);
+		num_op++;
+	}
+
+	req = ceph_osdc_alloc_request(osdc, snapc, num_op, use_mempool,
+					GFP_NOFS);
 	if (!req)
 		return ERR_PTR(-ENOMEM);
+	req->r_flags = flags;
 
 	/* calculate max write size */
-	r = calc_layout(osdc, vino, layout, off, plen, req, ops);
+	r = calc_layout(vino, layout, off, plen, req, ops);
 	if (r < 0)
 		return ERR_PTR(r);
 	req->r_file_layout = *layout;  /* keep a copy */
@@ -496,10 +432,8 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
 	req->r_num_pages = calc_pages_for(page_align, *plen);
 	req->r_page_alignment = page_align;
 
-	ceph_osdc_build_request(req, off, plen, ops,
-				snapc,
-				mtime,
-				req->r_oid, req->r_oid_len);
+	ceph_osdc_build_request(req, off, *plen, num_op, ops,
+				snapc, vino.snap, mtime);
 
 	return req;
 }
@@ -739,31 +673,35 @@ static void remove_old_osds(struct ceph_osd_client *osdc)
  */
 static int __reset_osd(struct ceph_osd_client *osdc, struct ceph_osd *osd)
 {
-	struct ceph_osd_request *req;
-	int ret = 0;
+	struct ceph_entity_addr *peer_addr;
 
 	dout("__reset_osd %p osd%d\n", osd, osd->o_osd);
 	if (list_empty(&osd->o_requests) &&
 	    list_empty(&osd->o_linger_requests)) {
 		__remove_osd(osdc, osd);
-		ret = -ENODEV;
-	} else if (memcmp(&osdc->osdmap->osd_addr[osd->o_osd],
-			  &osd->o_con.peer_addr,
-			  sizeof(osd->o_con.peer_addr)) == 0 &&
-		   !ceph_con_opened(&osd->o_con)) {
+
+		return -ENODEV;
+	}
+
+	peer_addr = &osdc->osdmap->osd_addr[osd->o_osd];
+	if (!memcmp(peer_addr, &osd->o_con.peer_addr, sizeof (*peer_addr)) &&
+			!ceph_con_opened(&osd->o_con)) {
+		struct ceph_osd_request *req;
+
 		dout(" osd addr hasn't changed and connection never opened,"
 		     " letting msgr retry");
 		/* touch each r_stamp for handle_timeout()'s benfit */
 		list_for_each_entry(req, &osd->o_requests, r_osd_item)
 			req->r_stamp = jiffies;
-		ret = -EAGAIN;
-	} else {
-		ceph_con_close(&osd->o_con);
-		ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd,
-			      &osdc->osdmap->osd_addr[osd->o_osd]);
-		osd->o_incarnation++;
+
+		return -EAGAIN;
 	}
-	return ret;
+
+	ceph_con_close(&osd->o_con);
+	ceph_con_open(&osd->o_con, CEPH_ENTITY_TYPE_OSD, osd->o_osd, peer_addr);
+	osd->o_incarnation++;
+
+	return 0;
 }
 
 static void __insert_osd(struct ceph_osd_client *osdc, struct ceph_osd *new)
@@ -1706,7 +1644,7 @@ int ceph_osdc_start_request(struct ceph_osd_client *osdc,
 #ifdef CONFIG_BLOCK
 	req->r_request->bio = req->r_bio;
 #endif
-	req->r_request->trail = req->r_trail;
+	req->r_request->trail = &req->r_trail;
 
 	register_request(osdc, req);
 
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index de73214b5d2..3c61e21611d 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -13,26 +13,18 @@
 
 char *ceph_osdmap_state_str(char *str, int len, int state)
 {
-	int flag = 0;
-
 	if (!len)
-		goto done;
-
-	*str = '\0';
-	if (state) {
-		if (state & CEPH_OSD_EXISTS) {
-			snprintf(str, len, "exists");
-			flag = 1;
-		}
-		if (state & CEPH_OSD_UP) {
-			snprintf(str, len, "%s%s%s", str, (flag ? ", " : ""),
-				 "up");
-			flag = 1;
-		}
-	} else {
+		return str;
+
+	if ((state & CEPH_OSD_EXISTS) && (state & CEPH_OSD_UP))
+		snprintf(str, len, "exists, up");
+	else if (state & CEPH_OSD_EXISTS)
+		snprintf(str, len, "exists");
+	else if (state & CEPH_OSD_UP)
+		snprintf(str, len, "up");
+	else
 		snprintf(str, len, "doesn't exist");
-	}
-done:
+
 	return str;
 }
 
@@ -170,6 +162,7 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
         c->choose_local_tries = 2;
         c->choose_local_fallback_tries = 5;
         c->choose_total_tries = 19;
+	c->chooseleaf_descend_once = 0;
 
 	ceph_decode_need(p, end, 4*sizeof(u32), bad);
 	magic = ceph_decode_32(p);
@@ -336,6 +329,11 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
         dout("crush decode tunable choose_total_tries = %d",
              c->choose_total_tries);
 
+	ceph_decode_need(p, end, sizeof(u32), done);
+	c->chooseleaf_descend_once = ceph_decode_32(p);
+	dout("crush decode tunable chooseleaf_descend_once = %d",
+	     c->chooseleaf_descend_once);
+
 done:
 	dout("crush_decode success\n");
 	return c;
@@ -1010,7 +1008,7 @@ bad:
  * pass a stride back to the caller.
  */
 int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
-				   u64 off, u64 *plen,
+				   u64 off, u64 len,
 				   u64 *ono,
 				   u64 *oxoff, u64 *oxlen)
 {
@@ -1021,7 +1019,7 @@ int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 	u32 su_per_object;
 	u64 t, su_offset;
 
-	dout("mapping %llu~%llu  osize %u fl_su %u\n", off, *plen,
+	dout("mapping %llu~%llu  osize %u fl_su %u\n", off, len,
 	     osize, su);
 	if (su == 0 || sc == 0)
 		goto invalid;
@@ -1054,11 +1052,10 @@ int ceph_calc_file_object_mapping(struct ceph_file_layout *layout,
 
 	/*
 	 * Calculate the length of the extent being written to the selected
-	 * object. This is the minimum of the full length requested (plen) or
+	 * object. This is the minimum of the full length requested (len) or
 	 * the remainder of the current stripe being written to.
 	 */
-	*oxlen = min_t(u64, *plen, su - su_offset);
-	*plen = *oxlen;
+	*oxlen = min_t(u64, len, su - su_offset);
 
 	dout(" obj extent %llu~%llu\n", *oxoff, *oxlen);
 	return 0;