Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless

4 files changed, 128 insertions, 111 deletions

diff --git a/drivers/md/persistent-data/dm-btree-internal.h b/drivers/md/persistent-data/dm-btree-internal.h
index d279c768f8f..5709bfeab1e 100644
--- a/drivers/md/persistent-data/dm-btree-internal.h
+++ b/drivers/md/persistent-data/dm-btree-internal.h
@@ -108,12 +108,9 @@ static inline void *value_base(struct node *n)
 	return &n->keys[le32_to_cpu(n->header.max_entries)];
 }
 
-/*
- * FIXME: Now that value size is stored in node we don't need the third parm.
- */
-static inline void *value_ptr(struct node *n, uint32_t index, size_t value_size)
+static inline void *value_ptr(struct node *n, uint32_t index)
 {
-	BUG_ON(value_size != le32_to_cpu(n->header.value_size));
+	uint32_t value_size = le32_to_cpu(n->header.value_size);
 	return value_base(n) + (value_size * index);
 }
 
diff --git a/drivers/md/persistent-data/dm-btree-remove.c b/drivers/md/persistent-data/dm-btree-remove.c
index 023fbc2d389..aa71e2359a0 100644
--- a/drivers/md/persistent-data/dm-btree-remove.c
+++ b/drivers/md/persistent-data/dm-btree-remove.c
@@ -61,20 +61,20 @@ static void node_shift(struct node *n, int shift)
 	if (shift < 0) {
 		shift = -shift;
 		BUG_ON(shift > nr_entries);
-		BUG_ON((void *) key_ptr(n, shift) >= value_ptr(n, shift, value_size));
+		BUG_ON((void *) key_ptr(n, shift) >= value_ptr(n, shift));
 		memmove(key_ptr(n, 0),
 			key_ptr(n, shift),
 			(nr_entries - shift) * sizeof(__le64));
-		memmove(value_ptr(n, 0, value_size),
-			value_ptr(n, shift, value_size),
+		memmove(value_ptr(n, 0),
+			value_ptr(n, shift),
 			(nr_entries - shift) * value_size);
 	} else {
 		BUG_ON(nr_entries + shift > le32_to_cpu(n->header.max_entries));
 		memmove(key_ptr(n, shift),
 			key_ptr(n, 0),
 			nr_entries * sizeof(__le64));
-		memmove(value_ptr(n, shift, value_size),
-			value_ptr(n, 0, value_size),
+		memmove(value_ptr(n, shift),
+			value_ptr(n, 0),
 			nr_entries * value_size);
 	}
 }
@@ -91,16 +91,16 @@ static void node_copy(struct node *left, struct node *right, int shift)
 		memcpy(key_ptr(left, nr_left),
 		       key_ptr(right, 0),
 		       shift * sizeof(__le64));
-		memcpy(value_ptr(left, nr_left, value_size),
-		       value_ptr(right, 0, value_size),
+		memcpy(value_ptr(left, nr_left),
+		       value_ptr(right, 0),
 		       shift * value_size);
 	} else {
 		BUG_ON(shift > le32_to_cpu(right->header.max_entries));
 		memcpy(key_ptr(right, 0),
 		       key_ptr(left, nr_left - shift),
 		       shift * sizeof(__le64));
-		memcpy(value_ptr(right, 0, value_size),
-		       value_ptr(left, nr_left - shift, value_size),
+		memcpy(value_ptr(right, 0),
+		       value_ptr(left, nr_left - shift),
 		       shift * value_size);
 	}
 }
@@ -120,26 +120,17 @@ static void delete_at(struct node *n, unsigned index)
 			key_ptr(n, index + 1),
 			nr_to_copy * sizeof(__le64));
 
-		memmove(value_ptr(n, index, value_size),
-			value_ptr(n, index + 1, value_size),
+		memmove(value_ptr(n, index),
+			value_ptr(n, index + 1),
 			nr_to_copy * value_size);
 	}
 
 	n->header.nr_entries = cpu_to_le32(nr_entries - 1);
 }
 
-static unsigned del_threshold(struct node *n)
-{
-	return le32_to_cpu(n->header.max_entries) / 3;
-}
-
 static unsigned merge_threshold(struct node *n)
 {
-	/*
-	 * The extra one is because we know we're potentially going to
-	 * delete an entry.
-	 */
-	return 2 * (le32_to_cpu(n->header.max_entries) / 3) + 1;
+	return le32_to_cpu(n->header.max_entries) / 3;
 }
 
 struct child {
@@ -175,7 +166,7 @@ static int init_child(struct dm_btree_info *info, struct node *parent,
 	if (inc)
 		inc_children(info->tm, result->n, &le64_type);
 
-	*((__le64 *) value_ptr(parent, index, sizeof(__le64))) =
+	*((__le64 *) value_ptr(parent, index)) =
 		cpu_to_le64(dm_block_location(result->block));
 
 	return 0;
@@ -188,6 +179,15 @@ static int exit_child(struct dm_btree_info *info, struct child *c)
 
 static void shift(struct node *left, struct node *right, int count)
 {
+	uint32_t nr_left = le32_to_cpu(left->header.nr_entries);
+	uint32_t nr_right = le32_to_cpu(right->header.nr_entries);
+	uint32_t max_entries = le32_to_cpu(left->header.max_entries);
+	uint32_t r_max_entries = le32_to_cpu(right->header.max_entries);
+
+	BUG_ON(max_entries != r_max_entries);
+	BUG_ON(nr_left - count > max_entries);
+	BUG_ON(nr_right + count > max_entries);
+
 	if (!count)
 		return;
 
@@ -199,13 +199,8 @@ static void shift(struct node *left, struct node *right, int count)
 		node_shift(right, count);
 	}
 
-	left->header.nr_entries =
-		cpu_to_le32(le32_to_cpu(left->header.nr_entries) - count);
-	BUG_ON(le32_to_cpu(left->header.nr_entries) > le32_to_cpu(left->header.max_entries));
-
-	right->header.nr_entries =
-		cpu_to_le32(le32_to_cpu(right->header.nr_entries) + count);
-	BUG_ON(le32_to_cpu(right->header.nr_entries) > le32_to_cpu(right->header.max_entries));
+	left->header.nr_entries = cpu_to_le32(nr_left - count);
+	right->header.nr_entries = cpu_to_le32(nr_right + count);
 }
 
 static void __rebalance2(struct dm_btree_info *info, struct node *parent,
@@ -215,8 +210,9 @@ static void __rebalance2(struct dm_btree_info *info, struct node *parent,
 	struct node *right = r->n;
 	uint32_t nr_left = le32_to_cpu(left->header.nr_entries);
 	uint32_t nr_right = le32_to_cpu(right->header.nr_entries);
+	unsigned threshold = 2 * merge_threshold(left) + 1;
 
-	if (nr_left + nr_right <= merge_threshold(left)) {
+	if (nr_left + nr_right < threshold) {
 		/*
 		 * Merge
 		 */
@@ -234,9 +230,6 @@ static void __rebalance2(struct dm_btree_info *info, struct node *parent,
 		 * Rebalance.
 		 */
 		unsigned target_left = (nr_left + nr_right) / 2;
-		unsigned shift_ = nr_left - target_left;
-		BUG_ON(le32_to_cpu(left->header.max_entries) <= nr_left - shift_);
-		BUG_ON(le32_to_cpu(right->header.max_entries) <= nr_right + shift_);
 		shift(left, right, nr_left - target_left);
 		*key_ptr(parent, r->index) = right->keys[0];
 	}
@@ -272,6 +265,84 @@ static int rebalance2(struct shadow_spine *s, struct dm_btree_info *info,
 	return exit_child(info, &right);
 }
 
+/*
+ * We dump as many entries from center as possible into left, then the rest
+ * in right, then rebalance2.  This wastes some cpu, but I want something
+ * simple atm.
+ */
+static void delete_center_node(struct dm_btree_info *info, struct node *parent,
+			       struct child *l, struct child *c, struct child *r,
+			       struct node *left, struct node *center, struct node *right,
+			       uint32_t nr_left, uint32_t nr_center, uint32_t nr_right)
+{
+	uint32_t max_entries = le32_to_cpu(left->header.max_entries);
+	unsigned shift = min(max_entries - nr_left, nr_center);
+
+	BUG_ON(nr_left + shift > max_entries);
+	node_copy(left, center, -shift);
+	left->header.nr_entries = cpu_to_le32(nr_left + shift);
+
+	if (shift != nr_center) {
+		shift = nr_center - shift;
+		BUG_ON((nr_right + shift) > max_entries);
+		node_shift(right, shift);
+		node_copy(center, right, shift);
+		right->header.nr_entries = cpu_to_le32(nr_right + shift);
+	}
+	*key_ptr(parent, r->index) = right->keys[0];
+
+	delete_at(parent, c->index);
+	r->index--;
+
+	dm_tm_dec(info->tm, dm_block_location(c->block));
+	__rebalance2(info, parent, l, r);
+}
+
+/*
+ * Redistributes entries among 3 sibling nodes.
+ */
+static void redistribute3(struct dm_btree_info *info, struct node *parent,
+			  struct child *l, struct child *c, struct child *r,
+			  struct node *left, struct node *center, struct node *right,
+			  uint32_t nr_left, uint32_t nr_center, uint32_t nr_right)
+{
+	int s;
+	uint32_t max_entries = le32_to_cpu(left->header.max_entries);
+	unsigned target = (nr_left + nr_center + nr_right) / 3;
+	BUG_ON(target > max_entries);
+
+	if (nr_left < nr_right) {
+		s = nr_left - target;
+
+		if (s < 0 && nr_center < -s) {
+			/* not enough in central node */
+			shift(left, center, nr_center);
+			s = nr_center - target;
+			shift(left, right, s);
+			nr_right += s;
+		} else
+			shift(left, center, s);
+
+		shift(center, right, target - nr_right);
+
+	} else {
+		s = target - nr_right;
+		if (s > 0 && nr_center < s) {
+			/* not enough in central node */
+			shift(center, right, nr_center);
+			s = target - nr_center;
+			shift(left, right, s);
+			nr_left -= s;
+		} else
+			shift(center, right, s);
+
+		shift(left, center, nr_left - target);
+	}
+
+	*key_ptr(parent, c->index) = center->keys[0];
+	*key_ptr(parent, r->index) = right->keys[0];
+}
+
 static void __rebalance3(struct dm_btree_info *info, struct node *parent,
 			 struct child *l, struct child *c, struct child *r)
 {
@@ -282,62 +353,18 @@ static void __rebalance3(struct dm_btree_info *info, struct node *parent,
 	uint32_t nr_left = le32_to_cpu(left->header.nr_entries);
 	uint32_t nr_center = le32_to_cpu(center->header.nr_entries);
 	uint32_t nr_right = le32_to_cpu(right->header.nr_entries);
-	uint32_t max_entries = le32_to_cpu(left->header.max_entries);
 
-	unsigned target;
+	unsigned threshold = merge_threshold(left) * 4 + 1;
 
 	BUG_ON(left->header.max_entries != center->header.max_entries);
 	BUG_ON(center->header.max_entries != right->header.max_entries);
 
-	if (((nr_left + nr_center + nr_right) / 2) < merge_threshold(center)) {
-		/*
-		 * Delete center node:
-		 *
-		 * We dump as many entries from center as possible into
-		 * left, then the rest in right, then rebalance2.  This
-		 * wastes some cpu, but I want something simple atm.
-		 */
-		unsigned shift = min(max_entries - nr_left, nr_center);
-
-		BUG_ON(nr_left + shift > max_entries);
-		node_copy(left, center, -shift);
-		left->header.nr_entries = cpu_to_le32(nr_left + shift);
-
-		if (shift != nr_center) {
-			shift = nr_center - shift;
-			BUG_ON((nr_right + shift) >= max_entries);
-			node_shift(right, shift);
-			node_copy(center, right, shift);
-			right->header.nr_entries = cpu_to_le32(nr_right + shift);
-		}
-		*key_ptr(parent, r->index) = right->keys[0];
-
-		delete_at(parent, c->index);
-		r->index--;
-
-		dm_tm_dec(info->tm, dm_block_location(c->block));
-		__rebalance2(info, parent, l, r);
-
-		return;
-	}
-
-	/*
-	 * Rebalance
-	 */
-	target = (nr_left + nr_center + nr_right) / 3;
-	BUG_ON(target > max_entries);
-
-	/*
-	 * Adjust the left node
-	 */
-	shift(left, center, nr_left - target);
-
-	/*
-	 * Adjust the right node
-	 */
-	shift(center, right, target - nr_right);
-	*key_ptr(parent, c->index) = center->keys[0];
-	*key_ptr(parent, r->index) = right->keys[0];
+	if ((nr_left + nr_center + nr_right) < threshold)
+		delete_center_node(info, parent, l, c, r, left, center, right,
+				   nr_left, nr_center, nr_right);
+	else
+		redistribute3(info, parent, l, c, r, left, center, right,
+			      nr_left, nr_center, nr_right);
 }
 
 static int rebalance3(struct shadow_spine *s, struct dm_btree_info *info,
@@ -441,9 +468,6 @@ static int rebalance_children(struct shadow_spine *s,
 	if (r)
 		return r;
 
-	if (child_entries > del_threshold(n))
-		return 0;
-
 	has_left_sibling = i > 0;
 	has_right_sibling = i < (le32_to_cpu(n->header.nr_entries) - 1);
 
@@ -496,7 +520,7 @@ static int remove_raw(struct shadow_spine *s, struct dm_btree_info *info,
 		 */
 		if (shadow_has_parent(s)) {
 			__le64 location = cpu_to_le64(dm_block_location(shadow_current(s)));
-			memcpy(value_ptr(dm_block_data(shadow_parent(s)), i, sizeof(__le64)),
+			memcpy(value_ptr(dm_block_data(shadow_parent(s)), i),
 			       &location, sizeof(__le64));
 		}
 
@@ -553,7 +577,7 @@ int dm_btree_remove(struct dm_btree_info *info, dm_block_t root,
 
 		if (info->value_type.dec)
 			info->value_type.dec(info->value_type.context,
-					     value_ptr(n, index, info->value_type.size));
+					     value_ptr(n, index));
 
 		delete_at(n, index);
 	}
diff --git a/drivers/md/persistent-data/dm-btree.c b/drivers/md/persistent-data/dm-btree.c
index bd1e7ffbe26..d12b2cc51f1 100644
--- a/drivers/md/persistent-data/dm-btree.c
+++ b/drivers/md/persistent-data/dm-btree.c
@@ -74,8 +74,7 @@ void inc_children(struct dm_transaction_manager *tm, struct node *n,
 			dm_tm_inc(tm, value64(n, i));
 	else if (vt->inc)
 		for (i = 0; i < nr_entries; i++)
-			vt->inc(vt->context,
-				value_ptr(n, i, vt->size));
+			vt->inc(vt->context, value_ptr(n, i));
 }
 
 static int insert_at(size_t value_size, struct node *node, unsigned index,
@@ -281,7 +280,7 @@ int dm_btree_del(struct dm_btree_info *info, dm_block_t root)
 
 				for (i = 0; i < f->nr_children; i++)
 					info->value_type.dec(info->value_type.context,
-							     value_ptr(f->n, i, info->value_type.size));
+							     value_ptr(f->n, i));
 			}
 			f->current_child = f->nr_children;
 		}
@@ -320,7 +319,7 @@ static int btree_lookup_raw(struct ro_spine *s, dm_block_t block, uint64_t key,
 	} while (!(flags & LEAF_NODE));
 
 	*result_key = le64_to_cpu(ro_node(s)->keys[i]);
-	memcpy(v, value_ptr(ro_node(s), i, value_size), value_size);
+	memcpy(v, value_ptr(ro_node(s), i), value_size);
 
 	return 0;
 }
@@ -432,7 +431,7 @@ static int btree_split_sibling(struct shadow_spine *s, dm_block_t root,
 
 	size = le32_to_cpu(ln->header.flags) & INTERNAL_NODE ?
 		sizeof(uint64_t) : s->info->value_type.size;
-	memcpy(value_ptr(rn, 0, size), value_ptr(ln, nr_left, size),
+	memcpy(value_ptr(rn, 0), value_ptr(ln, nr_left),
 	       size * nr_right);
 
 	/*
@@ -443,7 +442,7 @@ static int btree_split_sibling(struct shadow_spine *s, dm_block_t root,
 	pn = dm_block_data(parent);
 	location = cpu_to_le64(dm_block_location(left));
 	__dm_bless_for_disk(&location);
-	memcpy_disk(value_ptr(pn, parent_index, sizeof(__le64)),
+	memcpy_disk(value_ptr(pn, parent_index),
 		    &location, sizeof(__le64));
 
 	location = cpu_to_le64(dm_block_location(right));
@@ -529,8 +528,8 @@ static int btree_split_beneath(struct shadow_spine *s, uint64_t key)
 
 	size = le32_to_cpu(pn->header.flags) & INTERNAL_NODE ?
 		sizeof(__le64) : s->info->value_type.size;
-	memcpy(value_ptr(ln, 0, size), value_ptr(pn, 0, size), nr_left * size);
-	memcpy(value_ptr(rn, 0, size), value_ptr(pn, nr_left, size),
+	memcpy(value_ptr(ln, 0), value_ptr(pn, 0), nr_left * size);
+	memcpy(value_ptr(rn, 0), value_ptr(pn, nr_left),
 	       nr_right * size);
 
 	/* new_parent should just point to l and r now */
@@ -545,12 +544,12 @@ static int btree_split_beneath(struct shadow_spine *s, uint64_t key)
 	val = cpu_to_le64(dm_block_location(left));
 	__dm_bless_for_disk(&val);
 	pn->keys[0] = ln->keys[0];
-	memcpy_disk(value_ptr(pn, 0, sizeof(__le64)), &val, sizeof(__le64));
+	memcpy_disk(value_ptr(pn, 0), &val, sizeof(__le64));
 
 	val = cpu_to_le64(dm_block_location(right));
 	__dm_bless_for_disk(&val);
 	pn->keys[1] = rn->keys[0];
-	memcpy_disk(value_ptr(pn, 1, sizeof(__le64)), &val, sizeof(__le64));
+	memcpy_disk(value_ptr(pn, 1), &val, sizeof(__le64));
 
 	/*
 	 * rejig the spine.  This is ugly, since it knows too
@@ -595,7 +594,7 @@ static int btree_insert_raw(struct shadow_spine *s, dm_block_t root,
 			__le64 location = cpu_to_le64(dm_block_location(shadow_current(s)));
 
 			__dm_bless_for_disk(&location);
-			memcpy_disk(value_ptr(dm_block_data(shadow_parent(s)), i, sizeof(uint64_t)),
+			memcpy_disk(value_ptr(dm_block_data(shadow_parent(s)), i),
 				    &location, sizeof(__le64));
 		}
 
@@ -710,12 +709,12 @@ static int insert(struct dm_btree_info *info, dm_block_t root,
 		    (!info->value_type.equal ||
 		     !info->value_type.equal(
 			     info->value_type.context,
-			     value_ptr(n, index, info->value_type.size),
+			     value_ptr(n, index),
 			     value))) {
 			info->value_type.dec(info->value_type.context,
-					     value_ptr(n, index, info->value_type.size));
+					     value_ptr(n, index));
 		}
-		memcpy_disk(value_ptr(n, index, info->value_type.size),
+		memcpy_disk(value_ptr(n, index),
 			    value, info->value_type.size);
 	}
 
diff --git a/drivers/md/persistent-data/dm-space-map-common.c b/drivers/md/persistent-data/dm-space-map-common.c
index df2494c06cd..ff3beed6ad2 100644
--- a/drivers/md/persistent-data/dm-space-map-common.c
+++ b/drivers/md/persistent-data/dm-space-map-common.c
@@ -405,8 +405,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 		if (r < 0)
 			return r;
 
-#if 0
-		/* FIXME: dm_btree_remove doesn't handle this yet */
 		if (old > 2) {
 			r = dm_btree_remove(&ll->ref_count_info,
 					    ll->ref_count_root,
@@ -414,7 +412,6 @@ int sm_ll_insert(struct ll_disk *ll, dm_block_t b,
 			if (r)
 				return r;
 		}
-#endif
 
 	} else {
 		__le32 le_rc = cpu_to_le32(ref_count);