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-rw-r--r--drivers/md/persistent-data/dm-btree-internal.h7
-rw-r--r--drivers/md/persistent-data/dm-btree-remove.c202
-rw-r--r--drivers/md/persistent-data/dm-btree.c27
-rw-r--r--drivers/md/persistent-data/dm-space-map-common.c3
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);
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-23 23:58:16 +0000