$(check) $<
$(CC) $(CFLAGS) -c $<
-all: tester debug-tree
+all: tester debug-tree quick-test
debug-tree: $(objects) debug-tree.o
gcc $(CFLAGS) -o debug-tree $(objects) debug-tree.o
tester: $(objects) random-test.o
gcc $(CFLAGS) -o tester $(objects) random-test.o
+quick-test: $(objects) quick-test.o
+ gcc $(CFLAGS) -o quick-test $(objects) quick-test.o
+
$(objects) : $(headers)
clean :
int data_size);
static int push_node_left(struct ctree_root *root, struct tree_buffer *dst,
struct tree_buffer *src);
+static int balance_node_right(struct ctree_root *root,
+ struct tree_buffer *dst_buf,
+ struct tree_buffer *src_buf);
static int del_ptr(struct ctree_root *root, struct ctree_path *path, int level,
int slot);
int ret = 0;
int wret;
int pslot;
- int used = 0;
- int count;
int orig_slot = path->slots[level];
+ u64 orig_ptr;
if (level == 0)
return 0;
mid_buf = path->nodes[level];
mid = &mid_buf->node;
+ orig_ptr = mid->blockptrs[orig_slot];
+
if (level < MAX_LEVEL - 1)
parent_buf = path->nodes[level + 1];
pslot = path->slots[level + 1];
if (mid->header.nritems > NODEPTRS_PER_BLOCK / 4)
return 0;
- // print_tree(root, root->node);
left_buf = read_node_slot(root, parent_buf, pslot - 1);
right_buf = read_node_slot(root, parent_buf, pslot + 1);
- if (right_buf) {
- right = &right_buf->node;
- used = right->header.nritems;
- count = 1;
- }
+
+ /* first, try to make some room in the middle buffer */
if (left_buf) {
left = &left_buf->node;
- used += left->header.nritems;
orig_slot += left->header.nritems;
- count++;
+ wret = push_node_left(root, left_buf, mid_buf);
+ if (wret < 0)
+ ret = wret;
}
- if (left_buf)
- push_node_left(root, left_buf, mid_buf);
+
+ /*
+ * then try to empty the right most buffer into the middle
+ */
if (right_buf) {
- push_node_left(root, mid_buf, right_buf);
+ right = &right_buf->node;
+ wret = push_node_left(root, mid_buf, right_buf);
+ if (wret < 0)
+ ret = wret;
if (right->header.nritems == 0) {
u64 blocknr = right_buf->blocknr;
tree_block_release(root, right_buf);
} else {
memcpy(parent->keys + pslot + 1, right->keys,
sizeof(struct key));
+ wret = write_tree_block(root, parent_buf);
+ if (wret)
+ ret = wret;
}
}
+ if (mid->header.nritems == 1) {
+ /*
+ * we're not allowed to leave a node with one item in the
+ * tree during a delete. A deletion from lower in the tree
+ * could try to delete the only pointer in this node.
+ * So, pull some keys from the left.
+ * There has to be a left pointer at this point because
+ * otherwise we would have pulled some pointers from the
+ * right
+ */
+ BUG_ON(!left_buf);
+ wret = balance_node_right(root, mid_buf, left_buf);
+ if (wret < 0)
+ ret = wret;
+ BUG_ON(wret == 1);
+ }
if (mid->header.nritems == 0) {
+ /* we've managed to empty the middle node, drop it */
u64 blocknr = mid_buf->blocknr;
tree_block_release(root, mid_buf);
mid_buf = NULL;
wret = free_extent(root, blocknr, 1);
if (wret)
ret = wret;
- } else
+ } else {
+ /* update the parent key to reflect our changes */
memcpy(parent->keys + pslot, mid->keys, sizeof(struct key));
+ wret = write_tree_block(root, parent_buf);
+ if (wret)
+ ret = wret;
+ }
+ /* update the path */
if (left_buf) {
- if (left->header.nritems >= orig_slot) {
+ if (left->header.nritems > orig_slot) {
left_buf->count++; // released below
path->nodes[level] = left_buf;
path->slots[level + 1] -= 1;
path->slots[level] = orig_slot;
}
}
+ /* double check we haven't messed things up */
+ check_block(path, level);
+ if (orig_ptr != path->nodes[level]->node.blockptrs[path->slots[level]])
+ BUG();
if (right_buf)
tree_block_release(root, right_buf);
if (left_buf)
tree_block_release(root, left_buf);
-
return ret;
}
goto again;
c = &b->node;
slot = p->slots[level];
+ BUG_ON(c->header.nritems == 1);
}
b = read_tree_block(root, c->blockptrs[slot]);
} else {
/*
* try to push data from one node into the next node left in the
- * tree. The src node is found at specified level in the path.
- * If some bytes were pushed, return 0, otherwise return 1.
- *
- * Lower nodes/leaves in the path are not touched, higher nodes may
- * be modified to reflect the push.
- *
- * The path is altered to reflect the push.
+ * tree.
*
* returns 0 if some ptrs were pushed left, < 0 if there was some horrible
* error, and > 0 if there was no room in the left hand block.
}
if (src_nritems < push_items)
- push_items =src_nritems;
+ push_items = src_nritems;
+
memcpy(dst->keys + dst_nritems, src->keys,
push_items * sizeof(struct key));
memcpy(dst->blockptrs + dst_nritems, src->blockptrs,
return ret;
}
+/*
+ * try to push data from one node into the next node right in the
+ * tree.
+ *
+ * returns 0 if some ptrs were pushed, < 0 if there was some horrible
+ * error, and > 0 if there was no room in the right hand block.
+ *
+ * this will only push up to 1/2 the contents of the left node over
+ */
+static int balance_node_right(struct ctree_root *root,
+ struct tree_buffer *dst_buf,
+ struct tree_buffer *src_buf)
+{
+ struct node *src = &src_buf->node;
+ struct node *dst = &dst_buf->node;
+ int push_items = 0;
+ int max_push;
+ int src_nritems;
+ int dst_nritems;
+ int ret = 0;
+ int wret;
+
+ src_nritems = src->header.nritems;
+ dst_nritems = dst->header.nritems;
+ push_items = NODEPTRS_PER_BLOCK - dst_nritems;
+ if (push_items <= 0) {
+ return 1;
+ }
+
+ max_push = src_nritems / 2 + 1;
+ /* don't try to empty the node */
+ if (max_push > src_nritems)
+ return 1;
+ if (max_push < push_items)
+ push_items = max_push;
+
+ memmove(dst->keys + push_items, dst->keys,
+ dst_nritems * sizeof(struct key));
+ memmove(dst->blockptrs + push_items, dst->blockptrs,
+ dst_nritems * sizeof(u64));
+ memcpy(dst->keys, src->keys + src_nritems - push_items,
+ push_items * sizeof(struct key));
+ memcpy(dst->blockptrs, src->blockptrs + src_nritems - push_items,
+ push_items * sizeof(u64));
+
+ src->header.nritems -= push_items;
+ dst->header.nritems += push_items;
+
+ wret = write_tree_block(root, src_buf);
+ if (wret < 0)
+ ret = wret;
+
+ wret = write_tree_block(root, dst_buf);
+ if (wret < 0)
+ ret = wret;
+ return ret;
+}
+
/*
* helper function to insert a new root level in the tree.
* A new node is allocated, and a single item is inserted to
--- /dev/null
+#include <stdio.h>
+#include <stdlib.h>
+#include "kerncompat.h"
+#include "radix-tree.h"
+#include "ctree.h"
+#include "disk-io.h"
+#include "print-tree.h"
+
+/* for testing only */
+int next_key(int i, int max_key) {
+ return rand() % max_key;
+ //return i;
+}
+
+int main(int ac, char **av) {
+ struct key ins;
+ struct key last = { (u64)-1, 0, 0};
+ char *buf;
+ int i;
+ int num;
+ int ret;
+ int run_size = 100000;
+ int max_key = 100000000;
+ int tree_size = 0;
+ struct ctree_path path;
+ struct ctree_super_block super;
+ struct ctree_root *root;
+
+ radix_tree_init();
+
+ root = open_ctree("dbfile", &super);
+ srand(55);
+ for (i = 0; i < run_size; i++) {
+ buf = malloc(64);
+ num = next_key(i, max_key);
+ // num = i;
+ sprintf(buf, "string-%d", num);
+ if (i % 10000 == 0)
+ fprintf(stderr, "insert %d:%d\n", num, i);
+ ins.objectid = num;
+ ins.offset = 0;
+ ins.flags = 0;
+ ret = insert_item(root, &ins, buf, strlen(buf));
+ if (!ret)
+ tree_size++;
+ free(buf);
+ }
+ write_ctree_super(root, &super);
+ close_ctree(root);
+
+ root = open_ctree("dbfile", &super);
+ printf("starting search\n");
+ srand(55);
+ for (i = 0; i < run_size; i++) {
+ num = next_key(i, max_key);
+ ins.objectid = num;
+ init_path(&path);
+ if (i % 10000 == 0)
+ fprintf(stderr, "search %d:%d\n", num, i);
+ ret = search_slot(root, &ins, &path, 0);
+ if (ret) {
+ print_tree(root, root->node);
+ printf("unable to find %d\n", num);
+ exit(1);
+ }
+ release_path(root, &path);
+ }
+ write_ctree_super(root, &super);
+ close_ctree(root);
+ root = open_ctree("dbfile", &super);
+ printf("node %p level %d total ptrs %d free spc %lu\n", root->node,
+ node_level(root->node->node.header.flags),
+ root->node->node.header.nritems,
+ NODEPTRS_PER_BLOCK - root->node->node.header.nritems);
+ printf("all searches good, deleting some items\n");
+ i = 0;
+ srand(55);
+ for (i = 0 ; i < run_size/4; i++) {
+ num = next_key(i, max_key);
+ ins.objectid = num;
+ init_path(&path);
+ ret = search_slot(root, &ins, &path, -1);
+ if (!ret) {
+ if (i % 10000 == 0)
+ fprintf(stderr, "del %d:%d\n", num, i);
+ ret = del_item(root, &path);
+ if (ret != 0)
+ BUG();
+ tree_size--;
+ }
+ release_path(root, &path);
+ }
+ write_ctree_super(root, &super);
+ close_ctree(root);
+ root = open_ctree("dbfile", &super);
+ srand(128);
+ for (i = 0; i < run_size; i++) {
+ buf = malloc(64);
+ num = next_key(i, max_key);
+ sprintf(buf, "string-%d", num);
+ ins.objectid = num;
+ if (i % 10000 == 0)
+ fprintf(stderr, "insert %d:%d\n", num, i);
+ ret = insert_item(root, &ins, buf, strlen(buf));
+ if (!ret)
+ tree_size++;
+ free(buf);
+ }
+ write_ctree_super(root, &super);
+ close_ctree(root);
+ root = open_ctree("dbfile", &super);
+ srand(128);
+ printf("starting search2\n");
+ for (i = 0; i < run_size; i++) {
+ num = next_key(i, max_key);
+ ins.objectid = num;
+ init_path(&path);
+ if (i % 10000 == 0)
+ fprintf(stderr, "search %d:%d\n", num, i);
+ ret = search_slot(root, &ins, &path, 0);
+ if (ret) {
+ print_tree(root, root->node);
+ printf("unable to find %d\n", num);
+ exit(1);
+ }
+ release_path(root, &path);
+ }
+ printf("starting big long delete run\n");
+ while(root->node && root->node->node.header.nritems > 0) {
+ struct leaf *leaf;
+ int slot;
+ ins.objectid = (u64)-1;
+ init_path(&path);
+ ret = search_slot(root, &ins, &path, -1);
+ if (ret == 0)
+ BUG();
+
+ leaf = &path.nodes[0]->leaf;
+ slot = path.slots[0];
+ if (slot != leaf->header.nritems)
+ BUG();
+ while(path.slots[0] > 0) {
+ path.slots[0] -= 1;
+ slot = path.slots[0];
+ leaf = &path.nodes[0]->leaf;
+
+ memcpy(&last, &leaf->items[slot].key, sizeof(last));
+ if (tree_size % 10000 == 0)
+ printf("big del %d:%d\n", tree_size, i);
+ ret = del_item(root, &path);
+ if (ret != 0) {
+ printf("del_item returned %d\n", ret);
+ BUG();
+ }
+ tree_size--;
+ }
+ release_path(root, &path);
+ }
+ printf("tree size is now %d\n", tree_size);
+ printf("map tree\n");
+ print_tree(root->extent_root, root->extent_root->node);
+ write_ctree_super(root, &super);
+ close_ctree(root);
+ return 0;
+}
return -1;
}
+static int empty_tree(struct ctree_root *root, struct radix_tree_root *radix,
+ int nr)
+{
+ struct ctree_path path;
+ struct key key;
+ unsigned long found = 0;
+ int ret;
+ int slot;
+ int *ptr;
+ int count = 0;
+
+ key.offset = 0;
+ key.flags = 0;
+ key.objectid = (unsigned long)-1;
+ while(nr-- >= 0) {
+ init_path(&path);
+ ret = search_slot(root, &key, &path, -1);
+ if (ret < 0) {
+ release_path(root, &path);
+ return ret;
+ }
+ if (ret != 0) {
+ if (path.slots[0] == 0) {
+ release_path(root, &path);
+ break;
+ }
+ path.slots[0] -= 1;
+ }
+ slot = path.slots[0];
+ found = path.nodes[0]->leaf.items[slot].key.objectid;
+ ret = del_item(root, &path);
+ count++;
+ if (ret) {
+ fprintf(stderr,
+ "failed to remove %lu from tree\n",
+ found);
+ return -1;
+ }
+ release_path(root, &path);
+ ptr = radix_tree_delete(radix, found);
+ if (!ptr)
+ goto error;
+ if (!keep_running)
+ break;
+ }
+ return 0;
+error:
+ fprintf(stderr, "failed to delete from the radix %lu\n", found);
+ return -1;
+}
+
+static int fill_tree(struct ctree_root *root, struct radix_tree_root *radix,
+ int count)
+{
+ int i;
+ int err;
+ int ret = 0;
+ for (i = 0; i < count; i++) {
+ ret = ins_one(root, radix);
+ if (ret) {
+ printf("fill failed\n");
+ err = ret;
+ goto out;
+ }
+ if (!keep_running)
+ break;
+ }
+out:
+ return ret;
+}
+
+static int bulk_op(struct ctree_root *root, struct radix_tree_root *radix)
+{
+ int ret;
+ int nr = rand() % 20000;
+ static int run_nr = 0;
+
+ /* do the bulk op much less frequently */
+ if (run_nr++ % 100)
+ return 0;
+ ret = empty_tree(root, radix, nr);
+ if (ret)
+ return ret;
+ ret = fill_tree(root, radix, nr);
+ if (ret)
+ return ret;
+ return 0;
+}
+
+
int (*ops[])(struct ctree_root *root, struct radix_tree_root *radix) =
-{ ins_one, insert_dup, del_one, lookup_item, lookup_enoent };
+{ ins_one, insert_dup, del_one, lookup_item, lookup_enoent, bulk_op };
static int fill_radix(struct ctree_root *root, struct radix_tree_root *radix)
{
}
return 0;
}
-
void sigstopper(int ignored)
{
keep_running = 0;
print_usage();
}
}
- for (i = 0; i < init_fill_count; i++) {
- ret = ins_one(root, &radix);
- if (ret) {
- printf("initial fill failed\n");
- err = ret;
- goto out;
- }
- if (i % 10000 == 0) {
- printf("initial fill %d level %d count %d\n", i,
- node_level(root->node->node.header.flags),
- root->node->node.header.nritems);
- }
- if (keep_running == 0) {
- err = 0;
- goto out;
- }
+ printf("initial fill\n");
+ ret = fill_tree(root, &radix, init_fill_count);
+ printf("starting run\n");
+ if (ret) {
+ err = ret;
+ goto out;
}
if (initial_only == 1) {
goto out;
err = ret;
goto out;
}
+ if (ops[op] == bulk_op)
+ break;
if (keep_running == 0) {
err = 0;
goto out;
projects / platform / upstream / btrfs-progs.git / commitdiff