Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client

Pull Ceph updates from Sage Weil:
 "The biggest chunk is a series of patches from Ilya that add support
  for new Ceph osd and crush map features, including some new tunables,
  primary affinity, and the new encoding that is needed for erasure
  coding support.  This brings things into parity with the server side
  and the looming firefly release.  There is also support for allocation
  hints in RBD that help limit fragmentation on the server side.

  There is also a series of patches from Zheng fixing NFS reexport,
  directory fragmentation support, flock vs fnctl behavior, and some
  issues with clustered MDS.

  Finally, there are some miscellaneous fixes from Yunchuan Wen for
  fscache, Fabian Frederick for ACLs, and from me for fsync(dirfd)
  behavior"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client: (79 commits)
  ceph: skip invalid dentry during dcache readdir
  libceph: dump pool {read,write}_tier to debugfs
  libceph: output primary affinity values on osdmap updates
  ceph: flush cap release queue when trimming session caps
  ceph: don't grabs open file reference for aborted request
  ceph: drop extra open file reference in ceph_atomic_open()
  ceph: preallocate buffer for readdir reply
  libceph: enable PRIMARY_AFFINITY feature bit
  libceph: redo ceph_calc_pg_primary() in terms of ceph_calc_pg_acting()
  libceph: add support for osd primary affinity
  libceph: add support for primary_temp mappings
  libceph: return primary from ceph_calc_pg_acting()
  libceph: switch ceph_calc_pg_acting() to new helpers
  libceph: introduce apply_temps() helper
  libceph: introduce pg_to_raw_osds() and raw_to_up_osds() helpers
  libceph: ceph_can_shift_osds(pool) and pool type defines
  libceph: ceph_osd_{exists,is_up,is_down}(osd) definitions
  libceph: enable OSDMAP_ENC feature bit
  libceph: primary_affinity decode bits
  libceph: primary_affinity infrastructure
  ...

5 files changed, 864 insertions, 316 deletions

diff --git a/net/ceph/crush/mapper.c b/net/ceph/crush/mapper.c
index b703790b4e4..a1ef53c0441 100644
--- a/net/ceph/crush/mapper.c
+++ b/net/ceph/crush/mapper.c
@@ -292,10 +292,12 @@ static int is_out(const struct crush_map *map,
  * @outpos: our position in that vector
  * @tries: number of attempts to make
  * @recurse_tries: number of attempts to have recursive chooseleaf make
- * @local_tries: localized retries
- * @local_fallback_tries: localized fallback retries
+ * @local_retries: localized retries
+ * @local_fallback_retries: localized fallback retries
  * @recurse_to_leaf: true if we want one device under each item of given type (chooseleaf instead of choose)
+ * @vary_r: pass r to recursive calls
  * @out2: second output vector for leaf items (if @recurse_to_leaf)
+ * @parent_r: r value passed from the parent
  */
 static int crush_choose_firstn(const struct crush_map *map,
 			       struct crush_bucket *bucket,
@@ -304,10 +306,12 @@ static int crush_choose_firstn(const struct crush_map *map,
 			       int *out, int outpos,
 			       unsigned int tries,
 			       unsigned int recurse_tries,
-			       unsigned int local_tries,
-			       unsigned int local_fallback_tries,
+			       unsigned int local_retries,
+			       unsigned int local_fallback_retries,
 			       int recurse_to_leaf,
-			       int *out2)
+			       unsigned int vary_r,
+			       int *out2,
+			       int parent_r)
 {
 	int rep;
 	unsigned int ftotal, flocal;
@@ -319,8 +323,11 @@ static int crush_choose_firstn(const struct crush_map *map,
 	int itemtype;
 	int collide, reject;
 
-	dprintk("CHOOSE%s bucket %d x %d outpos %d numrep %d\n", recurse_to_leaf ? "_LEAF" : "",
-		bucket->id, x, outpos, numrep);
+	dprintk("CHOOSE%s bucket %d x %d outpos %d numrep %d tries %d recurse_tries %d local_retries %d local_fallback_retries %d parent_r %d\n",
+		recurse_to_leaf ? "_LEAF" : "",
+		bucket->id, x, outpos, numrep,
+		tries, recurse_tries, local_retries, local_fallback_retries,
+		parent_r);
 
 	for (rep = outpos; rep < numrep; rep++) {
 		/* keep trying until we get a non-out, non-colliding item */
@@ -335,7 +342,7 @@ static int crush_choose_firstn(const struct crush_map *map,
 			do {
 				collide = 0;
 				retry_bucket = 0;
-				r = rep;
+				r = rep + parent_r;
 				/* r' = r + f_total */
 				r += ftotal;
 
@@ -344,9 +351,9 @@ static int crush_choose_firstn(const struct crush_map *map,
 					reject = 1;
 					goto reject;
 				}
-				if (local_fallback_tries > 0 &&
+				if (local_fallback_retries > 0 &&
 				    flocal >= (in->size>>1) &&
-				    flocal > local_fallback_tries)
+				    flocal > local_fallback_retries)
 					item = bucket_perm_choose(in, x, r);
 				else
 					item = crush_bucket_choose(in, x, r);
@@ -387,16 +394,23 @@ static int crush_choose_firstn(const struct crush_map *map,
 				reject = 0;
 				if (!collide && recurse_to_leaf) {
 					if (item < 0) {
+						int sub_r;
+						if (vary_r)
+							sub_r = r >> (vary_r-1);
+						else
+							sub_r = 0;
 						if (crush_choose_firstn(map,
 							 map->buckets[-1-item],
 							 weight, weight_max,
 							 x, outpos+1, 0,
 							 out2, outpos,
 							 recurse_tries, 0,
-							 local_tries,
-							 local_fallback_tries,
+							 local_retries,
+							 local_fallback_retries,
 							 0,
-							 NULL) <= outpos)
+							 vary_r,
+							 NULL,
+							 sub_r) <= outpos)
 							/* didn't get leaf */
 							reject = 1;
 					} else {
@@ -420,14 +434,14 @@ reject:
 					ftotal++;
 					flocal++;
 
-					if (collide && flocal <= local_tries)
+					if (collide && flocal <= local_retries)
 						/* retry locally a few times */
 						retry_bucket = 1;
-					else if (local_fallback_tries > 0 &&
-						 flocal <= in->size + local_fallback_tries)
+					else if (local_fallback_retries > 0 &&
+						 flocal <= in->size + local_fallback_retries)
 						/* exhaustive bucket search */
 						retry_bucket = 1;
-					else if (ftotal <= tries)
+					else if (ftotal < tries)
 						/* then retry descent */
 						retry_descent = 1;
 					else
@@ -640,10 +654,20 @@ int crush_do_rule(const struct crush_map *map,
 	__u32 step;
 	int i, j;
 	int numrep;
-	int choose_tries = map->choose_total_tries;
-	int choose_local_tries = map->choose_local_tries;
-	int choose_local_fallback_tries = map->choose_local_fallback_tries;
+	/*
+	 * the original choose_total_tries value was off by one (it
+	 * counted "retries" and not "tries").  add one.
+	 */
+	int choose_tries = map->choose_total_tries + 1;
 	int choose_leaf_tries = 0;
+	/*
+	 * the local tries values were counted as "retries", though,
+	 * and need no adjustment
+	 */
+	int choose_local_retries = map->choose_local_tries;
+	int choose_local_fallback_retries = map->choose_local_fallback_tries;
+
+	int vary_r = map->chooseleaf_vary_r;
 
 	if ((__u32)ruleno >= map->max_rules) {
 		dprintk(" bad ruleno %d\n", ruleno);
@@ -676,13 +700,18 @@ int crush_do_rule(const struct crush_map *map,
 			break;
 
 		case CRUSH_RULE_SET_CHOOSE_LOCAL_TRIES:
-			if (curstep->arg1 > 0)
-				choose_local_tries = curstep->arg1;
+			if (curstep->arg1 >= 0)
+				choose_local_retries = curstep->arg1;
 			break;
 
 		case CRUSH_RULE_SET_CHOOSE_LOCAL_FALLBACK_TRIES:
-			if (curstep->arg1 > 0)
-				choose_local_fallback_tries = curstep->arg1;
+			if (curstep->arg1 >= 0)
+				choose_local_fallback_retries = curstep->arg1;
+			break;
+
+		case CRUSH_RULE_SET_CHOOSELEAF_VARY_R:
+			if (curstep->arg1 >= 0)
+				vary_r = curstep->arg1;
 			break;
 
 		case CRUSH_RULE_CHOOSELEAF_FIRSTN:
@@ -734,10 +763,12 @@ int crush_do_rule(const struct crush_map *map,
 						o+osize, j,
 						choose_tries,
 						recurse_tries,
-						choose_local_tries,
-						choose_local_fallback_tries,
+						choose_local_retries,
+						choose_local_fallback_retries,
 						recurse_to_leaf,
-						c+osize);
+						vary_r,
+						c+osize,
+						0);
 				} else {
 					crush_choose_indep(
 						map,
diff --git a/net/ceph/debugfs.c b/net/ceph/debugfs.c
index 258a382e75e..10421a4b76f 100644
--- a/net/ceph/debugfs.c
+++ b/net/ceph/debugfs.c
@@ -53,34 +53,55 @@ static int osdmap_show(struct seq_file *s, void *p)
 {
 	int i;
 	struct ceph_client *client = s->private;
+	struct ceph_osdmap *map = client->osdc.osdmap;
 	struct rb_node *n;
 
-	if (client->osdc.osdmap == NULL)
+	if (map == NULL)
 		return 0;
-	seq_printf(s, "epoch %d\n", client->osdc.osdmap->epoch);
+
+	seq_printf(s, "epoch %d\n", map->epoch);
 	seq_printf(s, "flags%s%s\n",
-		   (client->osdc.osdmap->flags & CEPH_OSDMAP_NEARFULL) ?
-		   " NEARFULL" : "",
-		   (client->osdc.osdmap->flags & CEPH_OSDMAP_FULL) ?
-		   " FULL" : "");
-	for (n = rb_first(&client->osdc.osdmap->pg_pools); n; n = rb_next(n)) {
+		   (map->flags & CEPH_OSDMAP_NEARFULL) ?  " NEARFULL" : "",
+		   (map->flags & CEPH_OSDMAP_FULL) ?  " FULL" : "");
+
+	for (n = rb_first(&map->pg_pools); n; n = rb_next(n)) {
 		struct ceph_pg_pool_info *pool =
 			rb_entry(n, struct ceph_pg_pool_info, node);
-		seq_printf(s, "pg_pool %llu pg_num %d / %d\n",
-			   (unsigned long long)pool->id, pool->pg_num,
-			   pool->pg_num_mask);
+
+		seq_printf(s, "pool %lld pg_num %u (%d) read_tier %lld write_tier %lld\n",
+			   pool->id, pool->pg_num, pool->pg_num_mask,
+			   pool->read_tier, pool->write_tier);
 	}
-	for (i = 0; i < client->osdc.osdmap->max_osd; i++) {
-		struct ceph_entity_addr *addr =
-			&client->osdc.osdmap->osd_addr[i];
-		int state = client->osdc.osdmap->osd_state[i];
+	for (i = 0; i < map->max_osd; i++) {
+		struct ceph_entity_addr *addr = &map->osd_addr[i];
+		int state = map->osd_state[i];
 		char sb[64];
 
-		seq_printf(s, "\tosd%d\t%s\t%3d%%\t(%s)\n",
+		seq_printf(s, "osd%d\t%s\t%3d%%\t(%s)\t%3d%%\n",
 			   i, ceph_pr_addr(&addr->in_addr),
-			   ((client->osdc.osdmap->osd_weight[i]*100) >> 16),
-			   ceph_osdmap_state_str(sb, sizeof(sb), state));
+			   ((map->osd_weight[i]*100) >> 16),
+			   ceph_osdmap_state_str(sb, sizeof(sb), state),
+			   ((ceph_get_primary_affinity(map, i)*100) >> 16));
+	}
+	for (n = rb_first(&map->pg_temp); n; n = rb_next(n)) {
+		struct ceph_pg_mapping *pg =
+			rb_entry(n, struct ceph_pg_mapping, node);
+
+		seq_printf(s, "pg_temp %llu.%x [", pg->pgid.pool,
+			   pg->pgid.seed);
+		for (i = 0; i < pg->pg_temp.len; i++)
+			seq_printf(s, "%s%d", (i == 0 ? "" : ","),
+				   pg->pg_temp.osds[i]);
+		seq_printf(s, "]\n");
 	}
+	for (n = rb_first(&map->primary_temp); n; n = rb_next(n)) {
+		struct ceph_pg_mapping *pg =
+			rb_entry(n, struct ceph_pg_mapping, node);
+
+		seq_printf(s, "primary_temp %llu.%x %d\n", pg->pgid.pool,
+			   pg->pgid.seed, pg->primary_temp.osd);
+	}
+
 	return 0;
 }
 
diff --git a/net/ceph/messenger.c b/net/ceph/messenger.c
index 30efc5c1862..4f55f9ce63f 100644
--- a/net/ceph/messenger.c
+++ b/net/ceph/messenger.c
@@ -919,6 +919,9 @@ static bool ceph_msg_data_pages_advance(struct ceph_msg_data_cursor *cursor,
 	if (!bytes || cursor->page_offset)
 		return false;	/* more bytes to process in the current page */
 
+	if (!cursor->resid)
+		return false;   /* no more data */
+
 	/* Move on to the next page; offset is already at 0 */
 
 	BUG_ON(cursor->page_index >= cursor->page_count);
@@ -1004,6 +1007,9 @@ static bool ceph_msg_data_pagelist_advance(struct ceph_msg_data_cursor *cursor,
 	if (!bytes || cursor->offset & ~PAGE_MASK)
 		return false;	/* more bytes to process in the current page */
 
+	if (!cursor->resid)
+		return false;   /* no more data */
+
 	/* Move on to the next page */
 
 	BUG_ON(list_is_last(&cursor->page->lru, &pagelist->head));
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index 82750f91586..b0dfce77656 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -436,6 +436,7 @@ static bool osd_req_opcode_valid(u16 opcode)
 	case CEPH_OSD_OP_OMAPCLEAR:
 	case CEPH_OSD_OP_OMAPRMKEYS:
 	case CEPH_OSD_OP_OMAP_CMP:
+	case CEPH_OSD_OP_SETALLOCHINT:
 	case CEPH_OSD_OP_CLONERANGE:
 	case CEPH_OSD_OP_ASSERT_SRC_VERSION:
 	case CEPH_OSD_OP_SRC_CMPXATTR:
@@ -591,6 +592,26 @@ void osd_req_op_watch_init(struct ceph_osd_request *osd_req,
 }
 EXPORT_SYMBOL(osd_req_op_watch_init);
 
+void osd_req_op_alloc_hint_init(struct ceph_osd_request *osd_req,
+				unsigned int which,
+				u64 expected_object_size,
+				u64 expected_write_size)
+{
+	struct ceph_osd_req_op *op = _osd_req_op_init(osd_req, which,
+						      CEPH_OSD_OP_SETALLOCHINT);
+
+	op->alloc_hint.expected_object_size = expected_object_size;
+	op->alloc_hint.expected_write_size = expected_write_size;
+
+	/*
+	 * CEPH_OSD_OP_SETALLOCHINT op is advisory and therefore deemed
+	 * not worth a feature bit.  Set FAILOK per-op flag to make
+	 * sure older osds don't trip over an unsupported opcode.
+	 */
+	op->flags |= CEPH_OSD_OP_FLAG_FAILOK;
+}
+EXPORT_SYMBOL(osd_req_op_alloc_hint_init);
+
 static void ceph_osdc_msg_data_add(struct ceph_msg *msg,
 				struct ceph_osd_data *osd_data)
 {
@@ -681,6 +702,12 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
 		dst->watch.ver = cpu_to_le64(src->watch.ver);
 		dst->watch.flag = src->watch.flag;
 		break;
+	case CEPH_OSD_OP_SETALLOCHINT:
+		dst->alloc_hint.expected_object_size =
+		    cpu_to_le64(src->alloc_hint.expected_object_size);
+		dst->alloc_hint.expected_write_size =
+		    cpu_to_le64(src->alloc_hint.expected_write_size);
+		break;
 	default:
 		pr_err("unsupported osd opcode %s\n",
 			ceph_osd_op_name(src->op));
@@ -688,7 +715,9 @@ static u64 osd_req_encode_op(struct ceph_osd_request *req,
 
 		return 0;
 	}
+
 	dst->op = cpu_to_le16(src->op);
+	dst->flags = cpu_to_le32(src->flags);
 	dst->payload_len = cpu_to_le32(src->payload_len);
 
 	return request_data_len;
@@ -1304,7 +1333,7 @@ static int __map_request(struct ceph_osd_client *osdc,
 {
 	struct ceph_pg pgid;
 	int acting[CEPH_PG_MAX_SIZE];
-	int o = -1, num = 0;
+	int num, o;
 	int err;
 	bool was_paused;
 
@@ -1317,11 +1346,9 @@ static int __map_request(struct ceph_osd_client *osdc,
 	}
 	req->r_pgid = pgid;
 
-	err = ceph_calc_pg_acting(osdc->osdmap, pgid, acting);
-	if (err > 0) {
-		o = acting[0];
-		num = err;
-	}
+	num = ceph_calc_pg_acting(osdc->osdmap, pgid, acting, &o);
+	if (num < 0)
+		num = 0;
 
 	was_paused = req->r_paused;
 	req->r_paused = __req_should_be_paused(osdc, req);
@@ -2033,7 +2060,7 @@ void ceph_osdc_handle_map(struct ceph_osd_client *osdc, struct ceph_msg *msg)
 			int skipped_map = 0;
 
 			dout("taking full map %u len %d\n", epoch, maplen);
-			newmap = osdmap_decode(&p, p+maplen);
+			newmap = ceph_osdmap_decode(&p, p+maplen);
 			if (IS_ERR(newmap)) {
 				err = PTR_ERR(newmap);
 				goto bad;
diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index aade4a5c1c0..e632b5a52f5 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -343,7 +343,7 @@ bad:
 
 /*
  * rbtree of pg_mapping for handling pg_temp (explicit mapping of pgid
- * to a set of osds)
+ * to a set of osds) and primary_temp (explicit primary setting)
  */
 static int pgid_cmp(struct ceph_pg l, struct ceph_pg r)
 {
@@ -506,7 +506,7 @@ static void __remove_pg_pool(struct rb_root *root, struct ceph_pg_pool_info *pi)
 	kfree(pi);
 }
 
-static int __decode_pool(void **p, void *end, struct ceph_pg_pool_info *pi)
+static int decode_pool(void **p, void *end, struct ceph_pg_pool_info *pi)
 {
 	u8 ev, cv;
 	unsigned len, num;
@@ -587,7 +587,7 @@ bad:
 	return -EINVAL;
 }
 
-static int __decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
+static int decode_pool_names(void **p, void *end, struct ceph_osdmap *map)
 {
 	struct ceph_pg_pool_info *pi;
 	u32 num, len;
@@ -633,6 +633,13 @@ void ceph_osdmap_destroy(struct ceph_osdmap *map)
 		rb_erase(&pg->node, &map->pg_temp);
 		kfree(pg);
 	}
+	while (!RB_EMPTY_ROOT(&map->primary_temp)) {
+		struct ceph_pg_mapping *pg =
+			rb_entry(rb_first(&map->primary_temp),
+				 struct ceph_pg_mapping, node);
+		rb_erase(&pg->node, &map->primary_temp);
+		kfree(pg);
+	}
 	while (!RB_EMPTY_ROOT(&map->pg_pools)) {
 		struct ceph_pg_pool_info *pi =
 			rb_entry(rb_first(&map->pg_pools),
@@ -642,186 +649,516 @@ void ceph_osdmap_destroy(struct ceph_osdmap *map)
 	kfree(map->osd_state);
 	kfree(map->osd_weight);
 	kfree(map->osd_addr);
+	kfree(map->osd_primary_affinity);
 	kfree(map);
 }
 
 /*
- * adjust max osd value.  reallocate arrays.
+ * Adjust max_osd value, (re)allocate arrays.
+ *
+ * The new elements are properly initialized.
  */
 static int osdmap_set_max_osd(struct ceph_osdmap *map, int max)
 {
 	u8 *state;
-	struct ceph_entity_addr *addr;
 	u32 *weight;
+	struct ceph_entity_addr *addr;
+	int i;
 
-	state = kcalloc(max, sizeof(*state), GFP_NOFS);
-	addr = kcalloc(max, sizeof(*addr), GFP_NOFS);
-	weight = kcalloc(max, sizeof(*weight), GFP_NOFS);
-	if (state == NULL || addr == NULL || weight == NULL) {
+	state = krealloc(map->osd_state, max*sizeof(*state), GFP_NOFS);
+	weight = krealloc(map->osd_weight, max*sizeof(*weight), GFP_NOFS);
+	addr = krealloc(map->osd_addr, max*sizeof(*addr), GFP_NOFS);
+	if (!state || !weight || !addr) {
 		kfree(state);
-		kfree(addr);
 		kfree(weight);
+		kfree(addr);
+
 		return -ENOMEM;
 	}
 
-	/* copy old? */
-	if (map->osd_state) {
-		memcpy(state, map->osd_state, map->max_osd*sizeof(*state));
-		memcpy(addr, map->osd_addr, map->max_osd*sizeof(*addr));
-		memcpy(weight, map->osd_weight, map->max_osd*sizeof(*weight));
-		kfree(map->osd_state);
-		kfree(map->osd_addr);
-		kfree(map->osd_weight);
+	for (i = map->max_osd; i < max; i++) {
+		state[i] = 0;
+		weight[i] = CEPH_OSD_OUT;
+		memset(addr + i, 0, sizeof(*addr));
 	}
 
 	map->osd_state = state;
 	map->osd_weight = weight;
 	map->osd_addr = addr;
+
+	if (map->osd_primary_affinity) {
+		u32 *affinity;
+
+		affinity = krealloc(map->osd_primary_affinity,
+				    max*sizeof(*affinity), GFP_NOFS);
+		if (!affinity)
+			return -ENOMEM;
+
+		for (i = map->max_osd; i < max; i++)
+			affinity[i] = CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+
+		map->osd_primary_affinity = affinity;
+	}
+
 	map->max_osd = max;
+
 	return 0;
 }
 
+#define OSDMAP_WRAPPER_COMPAT_VER	7
+#define OSDMAP_CLIENT_DATA_COMPAT_VER	1
+
 /*
- * decode a full map.
+ * Return 0 or error.  On success, *v is set to 0 for old (v6) osdmaps,
+ * to struct_v of the client_data section for new (v7 and above)
+ * osdmaps.
  */
-struct ceph_osdmap *osdmap_decode(void **p, void *end)
+static int get_osdmap_client_data_v(void **p, void *end,
+				    const char *prefix, u8 *v)
 {
-	struct ceph_osdmap *map;
-	u16 version;
-	u32 len, max, i;
-	int err = -EINVAL;
-	void *start = *p;
-	struct ceph_pg_pool_info *pi;
+	u8 struct_v;
+
+	ceph_decode_8_safe(p, end, struct_v, e_inval);
+	if (struct_v >= 7) {
+		u8 struct_compat;
+
+		ceph_decode_8_safe(p, end, struct_compat, e_inval);
+		if (struct_compat > OSDMAP_WRAPPER_COMPAT_VER) {
+			pr_warning("got v %d cv %d > %d of %s ceph_osdmap\n",
+				   struct_v, struct_compat,
+				   OSDMAP_WRAPPER_COMPAT_VER, prefix);
+			return -EINVAL;
+		}
+		*p += 4; /* ignore wrapper struct_len */
+
+		ceph_decode_8_safe(p, end, struct_v, e_inval);
+		ceph_decode_8_safe(p, end, struct_compat, e_inval);
+		if (struct_compat > OSDMAP_CLIENT_DATA_COMPAT_VER) {
+			pr_warning("got v %d cv %d > %d of %s ceph_osdmap client data\n",
+				   struct_v, struct_compat,
+				   OSDMAP_CLIENT_DATA_COMPAT_VER, prefix);
+			return -EINVAL;
+		}
+		*p += 4; /* ignore client data struct_len */
+	} else {
+		u16 version;
+
+		*p -= 1;
+		ceph_decode_16_safe(p, end, version, e_inval);
+		if (version < 6) {
+			pr_warning("got v %d < 6 of %s ceph_osdmap\n", version,
+				   prefix);
+			return -EINVAL;
+		}
 
-	dout("osdmap_decode %p to %p len %d\n", *p, end, (int)(end - *p));
+		/* old osdmap enconding */
+		struct_v = 0;
+	}
 
-	map = kzalloc(sizeof(*map), GFP_NOFS);
-	if (map == NULL)
-		return ERR_PTR(-ENOMEM);
-	map->pg_temp = RB_ROOT;
+	*v = struct_v;
+	return 0;
 
-	ceph_decode_16_safe(p, end, version, bad);
-	if (version > 6) {
-		pr_warning("got unknown v %d > 6 of osdmap\n", version);
-		goto bad;
+e_inval:
+	return -EINVAL;
+}
+
+static int __decode_pools(void **p, void *end, struct ceph_osdmap *map,
+			  bool incremental)
+{
+	u32 n;
+
+	ceph_decode_32_safe(p, end, n, e_inval);
+	while (n--) {
+		struct ceph_pg_pool_info *pi;
+		u64 pool;
+		int ret;
+
+		ceph_decode_64_safe(p, end, pool, e_inval);
+
+		pi = __lookup_pg_pool(&map->pg_pools, pool);
+		if (!incremental || !pi) {
+			pi = kzalloc(sizeof(*pi), GFP_NOFS);
+			if (!pi)
+				return -ENOMEM;
+
+			pi->id = pool;
+
+			ret = __insert_pg_pool(&map->pg_pools, pi);
+			if (ret) {
+				kfree(pi);
+				return ret;
+			}
+		}
+
+		ret = decode_pool(p, end, pi);
+		if (ret)
+			return ret;
 	}
-	if (version < 6) {
-		pr_warning("got old v %d < 6 of osdmap\n", version);
-		goto bad;
+
+	return 0;
+
+e_inval:
+	return -EINVAL;
+}
+
+static int decode_pools(void **p, void *end, struct ceph_osdmap *map)
+{
+	return __decode_pools(p, end, map, false);
+}
+
+static int decode_new_pools(void **p, void *end, struct ceph_osdmap *map)
+{
+	return __decode_pools(p, end, map, true);
+}
+
+static int __decode_pg_temp(void **p, void *end, struct ceph_osdmap *map,
+			    bool incremental)
+{
+	u32 n;
+
+	ceph_decode_32_safe(p, end, n, e_inval);
+	while (n--) {
+		struct ceph_pg pgid;
+		u32 len, i;
+		int ret;
+
+		ret = ceph_decode_pgid(p, end, &pgid);
+		if (ret)
+			return ret;
+
+		ceph_decode_32_safe(p, end, len, e_inval);
+
+		ret = __remove_pg_mapping(&map->pg_temp, pgid);
+		BUG_ON(!incremental && ret != -ENOENT);
+
+		if (!incremental || len > 0) {
+			struct ceph_pg_mapping *pg;
+
+			ceph_decode_need(p, end, len*sizeof(u32), e_inval);
+
+			if (len > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
+				return -EINVAL;
+
+			pg = kzalloc(sizeof(*pg) + len*sizeof(u32), GFP_NOFS);
+			if (!pg)
+				return -ENOMEM;
+
+			pg->pgid = pgid;
+			pg->pg_temp.len = len;
+			for (i = 0; i < len; i++)
+				pg->pg_temp.osds[i] = ceph_decode_32(p);
+
+			ret = __insert_pg_mapping(pg, &map->pg_temp);
+			if (ret) {
+				kfree(pg);
+				return ret;
+			}
+		}
 	}
 
-	ceph_decode_need(p, end, 2*sizeof(u64)+6*sizeof(u32), bad);
+	return 0;
+
+e_inval:
+	return -EINVAL;
+}
+
+static int decode_pg_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+	return __decode_pg_temp(p, end, map, false);
+}
+
+static int decode_new_pg_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+	return __decode_pg_temp(p, end, map, true);
+}
+
+static int __decode_primary_temp(void **p, void *end, struct ceph_osdmap *map,
+				 bool incremental)
+{
+	u32 n;
+
+	ceph_decode_32_safe(p, end, n, e_inval);
+	while (n--) {
+		struct ceph_pg pgid;
+		u32 osd;
+		int ret;
+
+		ret = ceph_decode_pgid(p, end, &pgid);
+		if (ret)
+			return ret;
+
+		ceph_decode_32_safe(p, end, osd, e_inval);
+
+		ret = __remove_pg_mapping(&map->primary_temp, pgid);
+		BUG_ON(!incremental && ret != -ENOENT);
+
+		if (!incremental || osd != (u32)-1) {
+			struct ceph_pg_mapping *pg;
+
+			pg = kzalloc(sizeof(*pg), GFP_NOFS);
+			if (!pg)
+				return -ENOMEM;
+
+			pg->pgid = pgid;
+			pg->primary_temp.osd = osd;
+
+			ret = __insert_pg_mapping(pg, &map->primary_temp);
+			if (ret) {
+				kfree(pg);
+				return ret;
+			}
+		}
+	}
+
+	return 0;
+
+e_inval:
+	return -EINVAL;
+}
+
+static int decode_primary_temp(void **p, void *end, struct ceph_osdmap *map)
+{
+	return __decode_primary_temp(p, end, map, false);
+}
+
+static int decode_new_primary_temp(void **p, void *end,
+				   struct ceph_osdmap *map)
+{
+	return __decode_primary_temp(p, end, map, true);
+}
+
+u32 ceph_get_primary_affinity(struct ceph_osdmap *map, int osd)
+{
+	BUG_ON(osd >= map->max_osd);
+
+	if (!map->osd_primary_affinity)
+		return CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+
+	return map->osd_primary_affinity[osd];
+}
+
+static int set_primary_affinity(struct ceph_osdmap *map, int osd, u32 aff)
+{
+	BUG_ON(osd >= map->max_osd);
+
+	if (!map->osd_primary_affinity) {
+		int i;
+
+		map->osd_primary_affinity = kmalloc(map->max_osd*sizeof(u32),
+						    GFP_NOFS);
+		if (!map->osd_primary_affinity)
+			return -ENOMEM;
+
+		for (i = 0; i < map->max_osd; i++)
+			map->osd_primary_affinity[i] =
+			    CEPH_OSD_DEFAULT_PRIMARY_AFFINITY;
+	}
+
+	map->osd_primary_affinity[osd] = aff;
+
+	return 0;
+}
+
+static int decode_primary_affinity(void **p, void *end,
+				   struct ceph_osdmap *map)
+{
+	u32 len, i;
+
+	ceph_decode_32_safe(p, end, len, e_inval);
+	if (len == 0) {
+		kfree(map->osd_primary_affinity);
+		map->osd_primary_affinity = NULL;
+		return 0;
+	}
+	if (len != map->max_osd)
+		goto e_inval;
+
+	ceph_decode_need(p, end, map->max_osd*sizeof(u32), e_inval);
+
+	for (i = 0; i < map->max_osd; i++) {
+		int ret;
+
+		ret = set_primary_affinity(map, i, ceph_decode_32(p));
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+
+e_inval:
+	return -EINVAL;
+}
+
+static int decode_new_primary_affinity(void **p, void *end,
+				       struct ceph_osdmap *map)
+{
+	u32 n;
+
+	ceph_decode_32_safe(p, end, n, e_inval);
+	while (n--) {
+		u32 osd, aff;
+		int ret;
+
+		ceph_decode_32_safe(p, end, osd, e_inval);
+		ceph_decode_32_safe(p, end, aff, e_inval);
+
+		ret = set_primary_affinity(map, osd, aff);
+		if (ret)
+			return ret;
+
+		pr_info("osd%d primary-affinity 0x%x\n", osd, aff);
+	}
+
+	return 0;
+
+e_inval:
+	return -EINVAL;
+}
+
+/*
+ * decode a full map.
+ */
+static int osdmap_decode(void **p, void *end, struct ceph_osdmap *map)
+{
+	u8 struct_v;
+	u32 epoch = 0;
+	void *start = *p;
+	u32 max;
+	u32 len, i;
+	int err;
+
+	dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
+
+	err = get_osdmap_client_data_v(p, end, "full", &struct_v);
+	if (err)
+		goto bad;
+
+	/* fsid, epoch, created, modified */
+	ceph_decode_need(p, end, sizeof(map->fsid) + sizeof(u32) +
+			 sizeof(map->created) + sizeof(map->modified), e_inval);
 	ceph_decode_copy(p, &map->fsid, sizeof(map->fsid));
-	map->epoch = ceph_decode_32(p);
+	epoch = map->epoch = ceph_decode_32(p);
 	ceph_decode_copy(p, &map->created, sizeof(map->created));
 	ceph_decode_copy(p, &map->modified, sizeof(map->modified));
 
-	ceph_decode_32_safe(p, end, max, bad);
-	while (max--) {
-		ceph_decode_need(p, end, 8 + 2, bad);
-		err = -ENOMEM;
-		pi = kzalloc(sizeof(*pi), GFP_NOFS);
-		if (!pi)
-			goto bad;
-		pi->id = ceph_decode_64(p);
-		err = __decode_pool(p, end, pi);
-		if (err < 0) {
-			kfree(pi);
-			goto bad;
-		}
-		__insert_pg_pool(&map->pg_pools, pi);
-	}
+	/* pools */
+	err = decode_pools(p, end, map);
+	if (err)
+		goto bad;
 
-	err = __decode_pool_names(p, end, map);
-	if (err < 0) {
-		dout("fail to decode pool names");
+	/* pool_name */
+	err = decode_pool_names(p, end, map);
+	if (err)
 		goto bad;
-	}
 
-	ceph_decode_32_safe(p, end, map->pool_max, bad);
+	ceph_decode_32_safe(p, end, map->pool_max, e_inval);
 
-	ceph_decode_32_safe(p, end, map->flags, bad);
+	ceph_decode_32_safe(p, end, map->flags, e_inval);
 
-	max = ceph_decode_32(p);
+	/* max_osd */
+	ceph_decode_32_safe(p, end, max, e_inval);
 
 	/* (re)alloc osd arrays */
 	err = osdmap_set_max_osd(map, max);
-	if (err < 0)
+	if (err)
 		goto bad;
-	dout("osdmap_decode max_osd = %d\n", map->max_osd);
 
-	/* osds */
-	err = -EINVAL;
+	/* osd_state, osd_weight, osd_addrs->client_addr */
 	ceph_decode_need(p, end, 3*sizeof(u32) +
 			 map->max_osd*(1 + sizeof(*map->osd_weight) +
-				       sizeof(*map->osd_addr)), bad);
-	*p += 4; /* skip length field (should match max) */
+				       sizeof(*map->osd_addr)), e_inval);
+
+	if (ceph_decode_32(p) != map->max_osd)
+		goto e_inval;
+
 	ceph_decode_copy(p, map->osd_state, map->max_osd);
 
-	*p += 4; /* skip length field (should match max) */
+	if (ceph_decode_32(p) != map->max_osd)
+		goto e_inval;
+
 	for (i = 0; i < map->max_osd; i++)
 		map->osd_weight[i] = ceph_decode_32(p);
 
-	*p += 4; /* skip length field (should match max) */
+	if (ceph_decode_32(p) != map->max_osd)
+		goto e_inval;
+
 	ceph_decode_copy(p, map->osd_addr, map->max_osd*sizeof(*map->osd_addr));
 	for (i = 0; i < map->max_osd; i++)
 		ceph_decode_addr(&map->osd_addr[i]);
 
 	/* pg_temp */
-	ceph_decode_32_safe(p, end, len, bad);
-	for (i = 0; i < len; i++) {
-		int n, j;
-		struct ceph_pg pgid;
-		struct ceph_pg_mapping *pg;
+	err = decode_pg_temp(p, end, map);
+	if (err)
+		goto bad;
 
-		err = ceph_decode_pgid(p, end, &pgid);
+	/* primary_temp */
+	if (struct_v >= 1) {
+		err = decode_primary_temp(p, end, map);
 		if (err)
 			goto bad;
-		ceph_decode_need(p, end, sizeof(u32), bad);
-		n = ceph_decode_32(p);
-		err = -EINVAL;
-		if (n > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
-			goto bad;
-		ceph_decode_need(p, end, n * sizeof(u32), bad);
-		err = -ENOMEM;
-		pg = kmalloc(sizeof(*pg) + n*sizeof(u32), GFP_NOFS);
-		if (!pg)
-			goto bad;
-		pg->pgid = pgid;
-		pg->len = n;
-		for (j = 0; j < n; j++)
-			pg->osds[j] = ceph_decode_32(p);
+	}
 
-		err = __insert_pg_mapping(pg, &map->pg_temp);
+	/* primary_affinity */
+	if (struct_v >= 2) {
+		err = decode_primary_affinity(p, end, map);
 		if (err)
 			goto bad;
-		dout(" added pg_temp %lld.%x len %d\n", pgid.pool, pgid.seed,
-		     len);
+	} else {
+		/* XXX can this happen? */
+		kfree(map->osd_primary_affinity);
+		map->osd_primary_affinity = NULL;
 	}
 
 	/* crush */
-	ceph_decode_32_safe(p, end, len, bad);
-	dout("osdmap_decode crush len %d from off 0x%x\n", len,
-	     (int)(*p - start));
-	ceph_decode_need(p, end, len, bad);
-	map->crush = crush_decode(*p, end);
-	*p += len;
+	ceph_decode_32_safe(p, end, len, e_inval);
+	map->crush = crush_decode(*p, min(*p + len, end));
 	if (IS_ERR(map->crush)) {
 		err = PTR_ERR(map->crush);
 		map->crush = NULL;
 		goto bad;
 	}
+	*p += len;
 
-	/* ignore the rest of the map */
+	/* ignore the rest */
 	*p = end;
 
-	dout("osdmap_decode done %p %p\n", *p, end);
-	return map;
+	dout("full osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
+	return 0;
 
+e_inval:
+	err = -EINVAL;
 bad:
-	dout("osdmap_decode fail err %d\n", err);
-	ceph_osdmap_destroy(map);
-	return ERR_PTR(err);
+	pr_err("corrupt full osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
+	       err, epoch, (int)(*p - start), *p, start, end);
+	print_hex_dump(KERN_DEBUG, "osdmap: ",
+		       DUMP_PREFIX_OFFSET, 16, 1,
+		       start, end - start, true);
+	return err;
+}
+
+/*
+ * Allocate and decode a full map.
+ */
+struct ceph_osdmap *ceph_osdmap_decode(void **p, void *end)
+{
+	struct ceph_osdmap *map;
+	int ret;
+
+	map = kzalloc(sizeof(*map), GFP_NOFS);
+	if (!map)
+		return ERR_PTR(-ENOMEM);
+
+	map->pg_temp = RB_ROOT;
+	map->primary_temp = RB_ROOT;
+	mutex_init(&map->crush_scratch_mutex);
+
+	ret = osdmap_decode(p, end, map);
+	if (ret) {
+		ceph_osdmap_destroy(map);
+		return ERR_PTR(ret);
+	}
+
+	return map;
 }
 
 /*
@@ -840,17 +1177,18 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	__s64 new_pool_max;
 	__s32 new_flags, max;
 	void *start = *p;
-	int err = -EINVAL;
-	u16 version;
+	int err;
+	u8 struct_v;
+
+	dout("%s %p to %p len %d\n", __func__, *p, end, (int)(end - *p));
 
-	ceph_decode_16_safe(p, end, version, bad);
-	if (version != 6) {
-		pr_warning("got unknown v %d != 6 of inc osdmap\n", version);
+	err = get_osdmap_client_data_v(p, end, "inc", &struct_v);
+	if (err)
 		goto bad;
-	}
 
-	ceph_decode_need(p, end, sizeof(fsid)+sizeof(modified)+2*sizeof(u32),
-			 bad);
+	/* fsid, epoch, modified, new_pool_max, new_flags */
+	ceph_decode_need(p, end, sizeof(fsid) + sizeof(u32) + sizeof(modified) +
+			 sizeof(u64) + sizeof(u32), e_inval);
 	ceph_decode_copy(p, &fsid, sizeof(fsid));
 	epoch = ceph_decode_32(p);
 	BUG_ON(epoch != map->epoch+1);
@@ -859,21 +1197,22 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	new_flags = ceph_decode_32(p);
 
 	/* full map? */
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	if (len > 0) {
 		dout("apply_incremental full map len %d, %p to %p\n",
 		     len, *p, end);
-		return osdmap_decode(p, min(*p+len, end));
+		return ceph_osdmap_decode(p, min(*p+len, end));
 	}
 
 	/* new crush? */
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	if (len > 0) {
-		dout("apply_incremental new crush map len %d, %p to %p\n",
-		     len, *p, end);
 		newcrush = crush_decode(*p, min(*p+len, end));
-		if (IS_ERR(newcrush))
-			return ERR_CAST(newcrush);
+		if (IS_ERR(newcrush)) {
+			err = PTR_ERR(newcrush);
+			newcrush = NULL;
+			goto bad;
+		}
 		*p += len;
 	}
 
@@ -883,13 +1222,11 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	if (new_pool_max >= 0)
 		map->pool_max = new_pool_max;
 
-	ceph_decode_need(p, end, 5*sizeof(u32), bad);
-
 	/* new max? */
-	max = ceph_decode_32(p);
+	ceph_decode_32_safe(p, end, max, e_inval);
 	if (max >= 0) {
 		err = osdmap_set_max_osd(map, max);
-		if (err < 0)
+		if (err)
 			goto bad;
 	}
 
@@ -902,51 +1239,34 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 		newcrush = NULL;
 	}
 
-	/* new_pool */
-	ceph_decode_32_safe(p, end, len, bad);
-	while (len--) {
-		struct ceph_pg_pool_info *pi;
+	/* new_pools */
+	err = decode_new_pools(p, end, map);
+	if (err)
+		goto bad;
 
-		ceph_decode_64_safe(p, end, pool, bad);
-		pi = __lookup_pg_pool(&map->pg_pools, pool);
-		if (!pi) {
-			pi = kzalloc(sizeof(*pi), GFP_NOFS);
-			if (!pi) {
-				err = -ENOMEM;
-				goto bad;
-			}
-			pi->id = pool;
-			__insert_pg_pool(&map->pg_pools, pi);
-		}
-		err = __decode_pool(p, end, pi);
-		if (err < 0)
-			goto bad;
-	}
-	if (version >= 5) {
-		err = __decode_pool_names(p, end, map);
-		if (err < 0)
-			goto bad;
-	}
+	/* new_pool_names */
+	err = decode_pool_names(p, end, map);
+	if (err)
+		goto bad;
 
 	/* old_pool */
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	while (len--) {
 		struct ceph_pg_pool_info *pi;
 
-		ceph_decode_64_safe(p, end, pool, bad);
+		ceph_decode_64_safe(p, end, pool, e_inval);
 		pi = __lookup_pg_pool(&map->pg_pools, pool);
 		if (pi)
 			__remove_pg_pool(&map->pg_pools, pi);
 	}
 
 	/* new_up */
-	err = -EINVAL;
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	while (len--) {
 		u32 osd;
 		struct ceph_entity_addr addr;
-		ceph_decode_32_safe(p, end, osd, bad);
-		ceph_decode_copy_safe(p, end, &addr, sizeof(addr), bad);
+		ceph_decode_32_safe(p, end, osd, e_inval);
+		ceph_decode_copy_safe(p, end, &addr, sizeof(addr), e_inval);
 		ceph_decode_addr(&addr);
 		pr_info("osd%d up\n", osd);
 		BUG_ON(osd >= map->max_osd);
@@ -955,11 +1275,11 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	}
 
 	/* new_state */
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	while (len--) {
 		u32 osd;
 		u8 xorstate;
-		ceph_decode_32_safe(p, end, osd, bad);
+		ceph_decode_32_safe(p, end, osd, e_inval);
 		xorstate = **(u8 **)p;
 		(*p)++;  /* clean flag */
 		if (xorstate == 0)
@@ -971,10 +1291,10 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	}
 
 	/* new_weight */
-	ceph_decode_32_safe(p, end, len, bad);
+	ceph_decode_32_safe(p, end, len, e_inval);
 	while (len--) {
 		u32 osd, off;
-		ceph_decode_need(p, end, sizeof(u32)*2, bad);
+		ceph_decode_need(p, end, sizeof(u32)*2, e_inval);
 		osd = ceph_decode_32(p);
 		off = ceph_decode_32(p);
 		pr_info("osd%d weight 0x%x %s\n", osd, off,
@@ -985,56 +1305,35 @@ struct ceph_osdmap *osdmap_apply_incremental(void **p, void *end,
 	}
 
 	/* new_pg_temp */
-	ceph_decode_32_safe(p, end, len, bad);
-	while (len--) {
-		struct ceph_pg_mapping *pg;
-		int j;
-		struct ceph_pg pgid;
-		u32 pglen;
+	err = decode_new_pg_temp(p, end, map);
+	if (err)
+		goto bad;
 
-		err = ceph_decode_pgid(p, end, &pgid);
+	/* new_primary_temp */
+	if (struct_v >= 1) {
+		err = decode_new_primary_temp(p, end, map);
 		if (err)
 			goto bad;
-		ceph_decode_need(p, end, sizeof(u32), bad);
-		pglen = ceph_decode_32(p);
-		if (pglen) {
-			ceph_decode_need(p, end, pglen*sizeof(u32), bad);
-
-			/* removing existing (if any) */
-			(void) __remove_pg_mapping(&map->pg_temp, pgid);
+	}
 
-			/* insert */
-			err = -EINVAL;
-			if (pglen > (UINT_MAX - sizeof(*pg)) / sizeof(u32))
-				goto bad;
-			err = -ENOMEM;
-			pg = kmalloc(sizeof(*pg) + sizeof(u32)*pglen, GFP_NOFS);
-			if (!pg)
-				goto bad;
-			pg->pgid = pgid;
-			pg->len = pglen;
-			for (j = 0; j < pglen; j++)
-				pg->osds[j] = ceph_decode_32(p);
-			err = __insert_pg_mapping(pg, &map->pg_temp);
-			if (err) {
-				kfree(pg);
-				goto bad;
-			}
-			dout(" added pg_temp %lld.%x len %d\n", pgid.pool,
-			     pgid.seed, pglen);
-		} else {
-			/* remove */
-			__remove_pg_mapping(&map->pg_temp, pgid);
-		}
+	/* new_primary_affinity */
+	if (struct_v >= 2) {
+		err = decode_new_primary_affinity(p, end, map);
+		if (err)
+			goto bad;
 	}
 
 	/* ignore the rest */
 	*p = end;
+
+	dout("inc osdmap epoch %d max_osd %d\n", map->epoch, map->max_osd);
 	return map;
 
+e_inval:
+	err = -EINVAL;
 bad:
-	pr_err("corrupt inc osdmap epoch %d off %d (%p of %p-%p)\n",
-	       epoch, (int)(*p - start), *p, start, end);
+	pr_err("corrupt inc osdmap (%d) epoch %d off %d (%p of %p-%p)\n",
+	       err, epoch, (int)(*p - start), *p, start, end);
 	print_hex_dump(KERN_DEBUG, "osdmap: ",
 		       DUMP_PREFIX_OFFSET, 16, 1,
 		       start, end - start, true);
@@ -1142,61 +1441,249 @@ int ceph_oloc_oid_to_pg(struct ceph_osdmap *osdmap,
 }
 EXPORT_SYMBOL(ceph_oloc_oid_to_pg);
 
-static int crush_do_rule_ary(const struct crush_map *map, int ruleno, int x,
-			     int *result, int result_max,
-			     const __u32 *weight, int weight_max)
+static int do_crush(struct ceph_osdmap *map, int ruleno, int x,
+		    int *result, int result_max,
+		    const __u32 *weight, int weight_max)
 {
-	int scratch[result_max * 3];
+	int r;
 
-	return crush_do_rule(map, ruleno, x, result, result_max,
-			     weight, weight_max, scratch);
+	BUG_ON(result_max > CEPH_PG_MAX_SIZE);
+
+	mutex_lock(&map->crush_scratch_mutex);
+	r = crush_do_rule(map->crush, ruleno, x, result, result_max,
+			  weight, weight_max, map->crush_scratch_ary);
+	mutex_unlock(&map->crush_scratch_mutex);
+
+	return r;
 }
 
 /*
- * Calculate raw osd vector for the given pgid.  Return pointer to osd
- * array, or NULL on failure.
+ * Calculate raw (crush) set for given pgid.
+ *
+ * Return raw set length, or error.
  */
-static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
-			int *osds, int *num)
+static int pg_to_raw_osds(struct ceph_osdmap *osdmap,
+			  struct ceph_pg_pool_info *pool,
+			  struct ceph_pg pgid, u32 pps, int *osds)
 {
-	struct ceph_pg_mapping *pg;
-	struct ceph_pg_pool_info *pool;
 	int ruleno;
-	int r;
-	u32 pps;
+	int len;
 
-	pool = __lookup_pg_pool(&osdmap->pg_pools, pgid.pool);
-	if (!pool)
-		return NULL;
+	/* crush */
+	ruleno = crush_find_rule(osdmap->crush, pool->crush_ruleset,
+				 pool->type, pool->size);
+	if (ruleno < 0) {
+		pr_err("no crush rule: pool %lld ruleset %d type %d size %d\n",
+		       pgid.pool, pool->crush_ruleset, pool->type,
+		       pool->size);
+		return -ENOENT;
+	}
 
-	/* pg_temp? */
+	len = do_crush(osdmap, ruleno, pps, osds,
+		       min_t(int, pool->size, CEPH_PG_MAX_SIZE),
+		       osdmap->osd_weight, osdmap->max_osd);
+	if (len < 0) {
+		pr_err("error %d from crush rule %d: pool %lld ruleset %d type %d size %d\n",
+		       len, ruleno, pgid.pool, pool->crush_ruleset,
+		       pool->type, pool->size);
+		return len;
+	}
+
+	return len;
+}
+
+/*
+ * Given raw set, calculate up set and up primary.
+ *
+ * Return up set length.  *primary is set to up primary osd id, or -1
+ * if up set is empty.
+ */
+static int raw_to_up_osds(struct ceph_osdmap *osdmap,
+			  struct ceph_pg_pool_info *pool,
+			  int *osds, int len, int *primary)
+{
+	int up_primary = -1;
+	int i;
+
+	if (ceph_can_shift_osds(pool)) {
+		int removed = 0;
+
+		for (i = 0; i < len; i++) {
+			if (ceph_osd_is_down(osdmap, osds[i])) {
+				removed++;
+				continue;
+			}
+			if (removed)
+				osds[i - removed] = osds[i];
+		}
+
+		len -= removed;
+		if (len > 0)
+			up_primary = osds[0];
+	} else {
+		for (i = len - 1; i >= 0; i--) {
+			if (ceph_osd_is_down(osdmap, osds[i]))
+				osds[i] = CRUSH_ITEM_NONE;
+			else
+				up_primary = osds[i];
+		}
+	}
+
+	*primary = up_primary;
+	return len;
+}
+
+static void apply_primary_affinity(struct ceph_osdmap *osdmap, u32 pps,
+				   struct ceph_pg_pool_info *pool,
+				   int *osds, int len, int *primary)
+{
+	int i;
+	int pos = -1;
+
+	/*
+	 * Do we have any non-default primary_affinity values for these
+	 * osds?
+	 */
+	if (!osdmap->osd_primary_affinity)
+		return;
+
+	for (i = 0; i < len; i++) {
+		if (osds[i] != CRUSH_ITEM_NONE &&
+		    osdmap->osd_primary_affinity[i] !=
+					CEPH_OSD_DEFAULT_PRIMARY_AFFINITY) {
+			break;
+		}
+	}
+	if (i == len)
+		return;
+
+	/*
+	 * Pick the primary.  Feed both the seed (for the pg) and the
+	 * osd into the hash/rng so that a proportional fraction of an
+	 * osd's pgs get rejected as primary.
+	 */
+	for (i = 0; i < len; i++) {
+		int osd;
+		u32 aff;
+
+		osd = osds[i];
+		if (osd == CRUSH_ITEM_NONE)
+			continue;
+
+		aff = osdmap->osd_primary_affinity[osd];
+		if (aff < CEPH_OSD_MAX_PRIMARY_AFFINITY &&
+		    (crush_hash32_2(CRUSH_HASH_RJENKINS1,
+				    pps, osd) >> 16) >= aff) {
+			/*
+			 * We chose not to use this primary.  Note it
+			 * anyway as a fallback in case we don't pick
+			 * anyone else, but keep looking.
+			 */
+			if (pos < 0)
+				pos = i;
+		} else {
+			pos = i;
+			break;
+		}
+	}
+	if (pos < 0)
+		return;
+
+	*primary = osds[pos];
+
+	if (ceph_can_shift_osds(pool) && pos > 0) {
+		/* move the new primary to the front */
+		for (i = pos; i > 0; i--)
+			osds[i] = osds[i - 1];
+		osds[0] = *primary;
+	}
+}
+
+/*
+ * Given up set, apply pg_temp and primary_temp mappings.
+ *
+ * Return acting set length.  *primary is set to acting primary osd id,
+ * or -1 if acting set is empty.
+ */
+static int apply_temps(struct ceph_osdmap *osdmap,
+		       struct ceph_pg_pool_info *pool, struct ceph_pg pgid,
+		       int *osds, int len, int *primary)
+{
+	struct ceph_pg_mapping *pg;
+	int temp_len;
+	int temp_primary;
+	int i;
+
+	/* raw_pg -> pg */
 	pgid.seed = ceph_stable_mod(pgid.seed, pool->pg_num,
 				    pool->pg_num_mask);
+
+	/* pg_temp? */
 	pg = __lookup_pg_mapping(&osdmap->pg_temp, pgid);
 	if (pg) {
-		*num = pg->len;
-		return pg->osds;
+		temp_len = 0;
+		temp_primary = -1;
+
+		for (i = 0; i < pg->pg_temp.len; i++) {
+			if (ceph_osd_is_down(osdmap, pg->pg_temp.osds[i])) {
+				if (ceph_can_shift_osds(pool))
+					continue;
+				else
+					osds[temp_len++] = CRUSH_ITEM_NONE;
+			} else {
+				osds[temp_len++] = pg->pg_temp.osds[i];
+			}
+		}
+
+		/* apply pg_temp's primary */
+		for (i = 0; i < temp_len; i++) {
+			if (osds[i] != CRUSH_ITEM_NONE) {
+				temp_primary = osds[i];
+				break;
+			}
+		}
+	} else {
+		temp_len = len;
+		temp_primary = *primary;
 	}
 
-	/* crush */
-	ruleno = crush_find_rule(osdmap->crush, pool->crush_ruleset,
-				 pool->type, pool->size);
-	if (ruleno < 0) {
-		pr_err("no crush rule pool %lld ruleset %d type %d size %d\n",
-		       pgid.pool, pool->crush_ruleset, pool->type,
-		       pool->size);
-		return NULL;
+	/* primary_temp? */
+	pg = __lookup_pg_mapping(&osdmap->primary_temp, pgid);
+	if (pg)
+		temp_primary = pg->primary_temp.osd;
+
+	*primary = temp_primary;
+	return temp_len;
+}
+
+/*
+ * Calculate acting set for given pgid.
+ *
+ * Return acting set length, or error.  *primary is set to acting
+ * primary osd id, or -1 if acting set is empty or on error.
+ */
+int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
+			int *osds, int *primary)
+{
+	struct ceph_pg_pool_info *pool;
+	u32 pps;
+	int len;
+
+	pool = __lookup_pg_pool(&osdmap->pg_pools, pgid.pool);
+	if (!pool) {
+		*primary = -1;
+		return -ENOENT;
 	}
 
 	if (pool->flags & CEPH_POOL_FLAG_HASHPSPOOL) {
-		/* hash pool id and seed sothat pool PGs do not overlap */
+		/* hash pool id and seed so that pool PGs do not overlap */
 		pps = crush_hash32_2(CRUSH_HASH_RJENKINS1,
 				     ceph_stable_mod(pgid.seed, pool->pgp_num,
 						     pool->pgp_num_mask),
 				     pgid.pool);
 	} else {
 		/*
-		 * legacy ehavior: add ps and pool together.  this is
+		 * legacy behavior: add ps and pool together.  this is
 		 * not a great approach because the PGs from each pool
 		 * will overlap on top of each other: 0.5 == 1.4 ==
 		 * 2.3 == ...
@@ -1205,38 +1692,20 @@ static int *calc_pg_raw(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
 				      pool->pgp_num_mask) +
 			(unsigned)pgid.pool;
 	}
-	r = crush_do_rule_ary(osdmap->crush, ruleno, pps,
-			      osds, min_t(int, pool->size, *num),
-			      osdmap->osd_weight, osdmap->max_osd);
-	if (r < 0) {
-		pr_err("error %d from crush rule: pool %lld ruleset %d type %d"
-		       " size %d\n", r, pgid.pool, pool->crush_ruleset,
-		       pool->type, pool->size);
-		return NULL;
+
+	len = pg_to_raw_osds(osdmap, pool, pgid, pps, osds);
+	if (len < 0) {
+		*primary = -1;
+		return len;
 	}
-	*num = r;
-	return osds;
-}
 
-/*
- * Return acting set for given pgid.
- */
-int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
-			int *acting)
-{
-	int rawosds[CEPH_PG_MAX_SIZE], *osds;
-	int i, o, num = CEPH_PG_MAX_SIZE;
+	len = raw_to_up_osds(osdmap, pool, osds, len, primary);
 
-	osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
-	if (!osds)
-		return -1;
+	apply_primary_affinity(osdmap, pps, pool, osds, len, primary);
 
-	/* primary is first up osd */
-	o = 0;
-	for (i = 0; i < num; i++)
-		if (ceph_osd_is_up(osdmap, osds[i]))
-			acting[o++] = osds[i];
-	return o;
+	len = apply_temps(osdmap, pool, pgid, osds, len, primary);
+
+	return len;
 }
 
 /*
@@ -1244,17 +1713,11 @@ int ceph_calc_pg_acting(struct ceph_osdmap *osdmap, struct ceph_pg pgid,
  */
 int ceph_calc_pg_primary(struct ceph_osdmap *osdmap, struct ceph_pg pgid)
 {
-	int rawosds[CEPH_PG_MAX_SIZE], *osds;
-	int i, num = CEPH_PG_MAX_SIZE;
+	int osds[CEPH_PG_MAX_SIZE];
+	int primary;
 
-	osds = calc_pg_raw(osdmap, pgid, rawosds, &num);
-	if (!osds)
-		return -1;
+	ceph_calc_pg_acting(osdmap, pgid, osds, &primary);
 
-	/* primary is first up osd */
-	for (i = 0; i < num; i++)
-		if (ceph_osd_is_up(osdmap, osds[i]))
-			return osds[i];
-	return -1;
+	return primary;
 }
 EXPORT_SYMBOL(ceph_calc_pg_primary);