Block sized tree extents and extent deletion
This commit is contained in:
Chris Mason
David Woodhouse
parent
e0bafb2999
commit
c6c63c3e74
247
ctree.c
247
ctree.c
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@ -8,9 +8,12 @@
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#define SEARCH_READ 0
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#define SEARCH_WRITE 1
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static int refill_alloc_extent(struct ctree_root *root);
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#define CTREE_EXTENT_PENDING 0
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int split_node(struct ctree_root *root, struct ctree_path *path, int level);
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int split_leaf(struct ctree_root *root, struct ctree_path *path, int data_size);
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struct tree_buffer *alloc_free_block(struct ctree_root *root);
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int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks);
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static inline void init_path(struct ctree_path *p)
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{
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@ -682,8 +685,6 @@ int insert_item(struct ctree_root *root, struct key *key,
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unsigned int data_end;
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struct ctree_path path;
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refill_alloc_extent(root);
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/* create a root if there isn't one */
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if (!root->node)
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BUG();
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@ -756,6 +757,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
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struct tree_buffer *t;
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struct node *node;
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int nritems;
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u64 blocknr;
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while(1) {
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t = path->nodes[level];
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@ -774,6 +776,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
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}
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node->header.nritems--;
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write_tree_block(root, t);
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blocknr = t->blocknr;
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if (node->header.nritems != 0) {
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int tslot;
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if (slot == 0)
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@ -799,6 +802,7 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
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break;
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}
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level++;
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free_extent(root, blocknr, 1);
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if (!path->nodes[level])
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BUG();
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}
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@ -841,8 +845,10 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
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if (leaf_buf == root->node) {
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leaf->header.flags = node_level(0);
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write_tree_block(root, leaf_buf);
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} else
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} else {
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del_ptr(root, path, 1);
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free_extent(root, leaf_buf->blocknr, 1);
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}
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} else {
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if (slot == 0)
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fixup_low_keys(root, path, &leaf->items[0].key, 1);
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@ -867,6 +873,72 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
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return 0;
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}
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static int del_pending_extents(struct ctree_root *extent_root)
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{
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int ret;
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struct key key;
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struct tree_buffer *gang[4];
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int i;
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struct ctree_path path;
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while(1) {
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ret = radix_tree_gang_lookup_tag(&extent_root->cache_radix,
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(void **)gang, 0, ARRAY_SIZE(gang),
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CTREE_EXTENT_PENDING);
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if (!ret)
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break;
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for (i = 0; i < ret; i++) {
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key.objectid = gang[i]->blocknr;
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key.flags = 0;
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key.offset = 1;
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init_path(&path);
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ret = search_slot(extent_root, &key, &path, 0);
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if (ret) {
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BUG();
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// FIXME undo it and return sane
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return ret;
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}
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ret = del_item(extent_root, &path);
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if (ret) {
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BUG();
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return ret;
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}
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release_path(extent_root, &path);
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radix_tree_tag_clear(&extent_root->cache_radix, gang[i]->blocknr,
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CTREE_EXTENT_PENDING);
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tree_block_release(extent_root, gang[i]);
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}
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}
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return 0;
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}
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int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks)
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{
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struct ctree_path path;
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struct key key;
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struct ctree_root *extent_root = root->extent_root;
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struct tree_buffer *t;
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int pending_ret;
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int ret;
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key.objectid = blocknr;
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key.flags = 0;
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key.offset = num_blocks;
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if (root == extent_root) {
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t = read_tree_block(root, key.objectid);
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radix_tree_tag_set(&root->cache_radix, key.objectid, CTREE_EXTENT_PENDING);
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return 0;
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}
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init_path(&path);
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ret = search_slot(extent_root, &key, &path, 0);
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if (ret)
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BUG();
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ret = del_item(extent_root, &path);
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release_path(extent_root, &path);
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pending_ret = del_pending_extents(root->extent_root);
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return ret ? ret : pending_ret;
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}
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int next_leaf(struct ctree_root *root, struct ctree_path *path)
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{
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int slot;
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@ -904,8 +976,8 @@ int next_leaf(struct ctree_root *root, struct ctree_path *path)
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return 0;
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}
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int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
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u64 search_end, u64 owner, struct key *ins)
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int find_free_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
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u64 search_end, struct key *ins)
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{
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struct ctree_path path;
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struct key *key;
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@ -915,15 +987,13 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
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u64 last_block;
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int start_found = 0;
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struct leaf *l;
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struct extent_item extent_item;
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struct ctree_root * root = orig_root->extent_root;
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init_path(&path);
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ins->objectid = search_start;
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ins->offset = 0;
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ins->flags = 0;
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ret = search_slot(root, ins, &path, sizeof(struct extent_item));
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ret = search_slot(root, ins, &path, 0);
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while (1) {
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l = &path.nodes[0]->leaf;
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slot = path.slots[0];
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@ -938,6 +1008,7 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
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ins->objectid = search_start;
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ins->offset = num_blocks;
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hole_size = search_end - search_start;
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start_found = 1;
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goto insert;
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}
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ins->objectid = last_block;
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@ -956,51 +1027,119 @@ int alloc_extent(struct ctree_root *orig_root, u64 num_blocks, u64 search_start,
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} else
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start_found = 1;
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last_block = key->objectid + key->offset;
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insert_failed:
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path.slots[0]++;
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}
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// FIXME -ENOSPC
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insert:
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release_path(root, &path);
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extent_item.refs = 1;
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extent_item.owner = owner;
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if (root == orig_root && root->reserve_extent->num_blocks == 0) {
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root->reserve_extent->blocknr = ins->objectid;
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root->reserve_extent->num_blocks = ins->offset;
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root->reserve_extent->num_used = 0;
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if (orig_root->extent_root == orig_root) {
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BUG_ON(num_blocks != 1);
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if ((root->current_insert.objectid <= ins->objectid &&
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root->current_insert.objectid + root->current_insert.offset >
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ins->objectid) ||
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(root->current_insert.objectid > ins->objectid &&
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root->current_insert.objectid <= ins->objectid + ins->offset) ||
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radix_tree_tag_get(&root->cache_radix, ins->objectid,
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CTREE_EXTENT_PENDING)) {
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last_block = ins->objectid + 1;
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search_start = last_block;
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goto insert_failed;
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}
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}
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ret = insert_item(root->extent_root, ins, &extent_item, sizeof(extent_item));
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return ret;
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release_path(root, &path);
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if (ins->offset != 1)
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BUG();
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return 0;
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}
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static int refill_alloc_extent(struct ctree_root *root)
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static int insert_pending_extents(struct ctree_root *extent_root)
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{
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struct alloc_extent *ae = root->alloc_extent;
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struct key key;
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int ret;
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int min_blocks = MAX_LEVEL * 2;
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struct key key;
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struct extent_item item;
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struct tree_buffer *gang[4];
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int i;
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if (ae->num_blocks > ae->num_used && ae->num_blocks - ae->num_used >
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min_blocks)
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return 0;
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ae = root->reserve_extent;
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if (ae->num_blocks > ae->num_used) {
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if (root->alloc_extent->num_blocks == 0) {
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/* we should swap reserve/alloc_extent when alloc
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* fills up
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*/
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BUG();
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// FIXME -ENOSPC
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item.refs = 1;
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item.owner = extent_root->node->node.header.parentid;
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while(1) {
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ret = radix_tree_gang_lookup_tag(&extent_root->cache_radix,
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(void **)gang, 0, ARRAY_SIZE(gang),
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CTREE_EXTENT_PENDING);
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if (!ret)
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break;
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for (i = 0; i < ret; i++) {
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key.objectid = gang[i]->blocknr;
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key.flags = 0;
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key.offset = 1;
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ret = insert_item(extent_root, &key, &item, sizeof(item));
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if (ret) {
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BUG();
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// FIXME undo it and return sane
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return ret;
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}
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radix_tree_tag_clear(&extent_root->cache_radix, gang[i]->blocknr,
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CTREE_EXTENT_PENDING);
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tree_block_release(extent_root, gang[i]);
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}
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if (ae->num_blocks - ae->num_used < min_blocks)
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BUG();
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}
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return 0;
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}
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int alloc_extent(struct ctree_root *root, u64 num_blocks, u64 search_start,
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u64 search_end, u64 owner, struct key *ins, struct tree_buffer **buf)
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{
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int ret;
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int pending_ret;
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struct extent_item extent_item;
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extent_item.refs = 1;
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extent_item.owner = owner;
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ret = find_free_extent(root, num_blocks, search_start, search_end, ins);
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if (ret)
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return ret;
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if (root != root->extent_root) {
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memcpy(&root->extent_root->current_insert, ins, sizeof(*ins));
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ret = insert_item(root->extent_root, ins, &extent_item, sizeof(extent_item));
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memset(&root->extent_root->current_insert, 0, sizeof(struct key));
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pending_ret = insert_pending_extents(root->extent_root);
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if (ret)
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return ret;
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if (pending_ret)
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return pending_ret;
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*buf = find_tree_block(root, ins->objectid);
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return 0;
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}
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ret = alloc_extent(root,
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min_blocks * 2, 0, (unsigned long)-1,
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root->node->node.header.parentid, &key);
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ae->blocknr = key.objectid;
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ae->num_blocks = key.offset;
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ae->num_used = 0;
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return ret;
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/* we're allocating an extent for the extent tree, don't recurse */
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BUG_ON(ins->offset != 1);
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*buf = find_tree_block(root, ins->objectid);
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BUG_ON(!*buf);
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radix_tree_tag_set(&root->cache_radix, ins->objectid, CTREE_EXTENT_PENDING);
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(*buf)->count++;
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return 0;
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}
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struct tree_buffer *alloc_free_block(struct ctree_root *root)
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{
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struct key ins;
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int ret;
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struct tree_buffer *buf = NULL;
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ret = alloc_extent(root, 1, 0, (unsigned long)-1, root->node->node.header.parentid,
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&ins, &buf);
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if (ret) {
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BUG();
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return NULL;
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}
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if (root != root->extent_root)
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BUG_ON(radix_tree_tag_get(&root->extent_root->cache_radix, buf->blocknr,
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CTREE_EXTENT_PENDING));
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return buf;
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}
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void print_leaf(struct leaf *l)
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@ -1096,6 +1235,7 @@ int main() {
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print_tree(root, root->node);
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printf("map tree\n");
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print_tree(root->extent_root, root->extent_root->node);
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fflush(stdout);
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srand(55);
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for (i = 0; i < run_size; i++) {
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@ -1111,12 +1251,6 @@ int main() {
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if (!ret)
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tree_size++;
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}
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printf("root used: %lu\n", root->alloc_extent->num_used);
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printf("root tree\n");
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// print_tree(root, root->node);
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printf("map tree\n");
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printf("map used: %lu\n", root->extent_root->alloc_extent->num_used);
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// print_tree(root->extent_root, root->extent_root->node);
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write_ctree_super(root, &super);
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close_ctree(root);
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@ -1167,12 +1301,27 @@ int main() {
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ret = insert_item(root, &ins, buf, strlen(buf));
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if (!ret)
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tree_size++;
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if (i >= 5) {
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struct key ugh;
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ugh.objectid = 5;
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ugh.flags = 0;
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ugh.offset = 0;
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init_path(&path);
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ret = search_slot(root, &ugh, &path, 0);
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if (ret) {
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print_tree(root, root->node);
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printf("unable to find 5 %d\n", num);
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exit(1);
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}
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release_path(root, &path);
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}
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}
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write_ctree_super(root, &super);
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close_ctree(root);
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root = open_ctree("dbfile", &super);
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printf("starting search2\n");
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srand(128);
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printf("starting search2\n");
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for (i = 0; i < run_size; i++) {
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num = next_key(i, max_key);
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ins.objectid = num;
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@ -1219,5 +1368,7 @@ int main() {
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write_ctree_super(root, &super);
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close_ctree(root);
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printf("tree size is now %d\n", tree_size);
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printf("map tree\n");
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print_tree(root->extent_root, root->extent_root->node);
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return 0;
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}
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13
ctree.h
13
ctree.h
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@ -28,21 +28,12 @@ struct header {
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struct tree_buffer;
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struct alloc_extent {
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u64 blocknr;
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u64 num_blocks;
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u64 num_used;
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} __attribute__ ((__packed__));
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struct ctree_root {
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struct tree_buffer *node;
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struct ctree_root *extent_root;
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struct alloc_extent *alloc_extent;
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struct alloc_extent *reserve_extent;
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struct key current_insert;
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int fp;
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struct radix_tree_root cache_radix;
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struct alloc_extent ai1;
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struct alloc_extent ai2;
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};
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struct ctree_root_info {
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@ -52,8 +43,6 @@ struct ctree_root_info {
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u64 tree_root; /* the tree root */
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u32 csum;
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u32 ham;
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struct alloc_extent alloc_extent;
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struct alloc_extent reserve_extent;
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u64 snapuuid[2]; /* root specific uuid */
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} __attribute__ ((__packed__));
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90
disk-io.c
90
disk-io.c
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@ -12,33 +12,13 @@
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static int allocated_blocks = 0;
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static int get_free_block(struct ctree_root *root, u64 *block)
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static int check_tree_block(struct ctree_root *root, struct tree_buffer *buf)
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{
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struct stat st;
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int ret = 0;
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if (root->alloc_extent->num_used >= root->alloc_extent->num_blocks)
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return -1;
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*block = root->alloc_extent->blocknr + root->alloc_extent->num_used;
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root->alloc_extent->num_used += 1;
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if (root->alloc_extent->num_used >= root->alloc_extent->num_blocks) {
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struct alloc_extent *ae = root->alloc_extent;
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root->alloc_extent = root->reserve_extent;
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root->reserve_extent = ae;
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ae->num_blocks = 0;
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}
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st.st_size = 0;
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ret = fstat(root->fp, &st);
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if (st.st_size < (*block + 1) * CTREE_BLOCKSIZE) {
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ret = ftruncate(root->fp,
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(*block + 1) * CTREE_BLOCKSIZE);
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if (ret) {
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perror("ftruncate");
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exit(1);
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}
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}
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return ret;
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if (buf->blocknr != buf->node.header.blocknr)
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BUG();
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if (root->node && buf->node.header.parentid != root->node->node.header.parentid)
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||||
BUG();
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct tree_buffer *alloc_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
|
|
@ -61,22 +41,23 @@ struct tree_buffer *alloc_tree_block(struct ctree_root *root, u64 blocknr)
|
|||
return buf;
|
||||
}
|
||||
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root)
|
||||
struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
{
|
||||
u64 free_block;
|
||||
int ret;
|
||||
struct tree_buffer * buf;
|
||||
ret = get_free_block(root, &free_block);
|
||||
if (ret) {
|
||||
BUG();
|
||||
return NULL;
|
||||
struct tree_buffer *buf;
|
||||
buf = radix_tree_lookup(&root->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf) {
|
||||
BUG();
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
buf = alloc_tree_block(root, free_block);
|
||||
if (!buf)
|
||||
BUG();
|
||||
return buf;
|
||||
}
|
||||
|
||||
|
||||
struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
|
||||
{
|
||||
loff_t offset = blocknr * CTREE_BLOCKSIZE;
|
||||
|
|
@ -86,20 +67,17 @@ struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
|
|||
buf = radix_tree_lookup(&root->cache_radix, blocknr);
|
||||
if (buf) {
|
||||
buf->count++;
|
||||
goto test;
|
||||
} else {
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf)
|
||||
return NULL;
|
||||
ret = pread(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
|
||||
if (ret != CTREE_BLOCKSIZE) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
}
|
||||
buf = alloc_tree_block(root, blocknr);
|
||||
if (!buf)
|
||||
return NULL;
|
||||
ret = pread(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
|
||||
if (ret != CTREE_BLOCKSIZE) {
|
||||
free(buf);
|
||||
return NULL;
|
||||
}
|
||||
test:
|
||||
if (buf->blocknr != buf->node.header.blocknr)
|
||||
BUG();
|
||||
if (root->node && buf->node.header.parentid != root->node->node.header.parentid)
|
||||
if (check_tree_block(root, buf))
|
||||
BUG();
|
||||
return buf;
|
||||
}
|
||||
|
|
@ -121,17 +99,10 @@ int write_tree_block(struct ctree_root *root, struct tree_buffer *buf)
|
|||
static int __setup_root(struct ctree_root *root, struct ctree_root *extent_root,
|
||||
struct ctree_root_info *info, int fp)
|
||||
{
|
||||
INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
|
||||
root->fp = fp;
|
||||
root->node = NULL;
|
||||
root->node = read_tree_block(root, info->tree_root);
|
||||
root->extent_root = extent_root;
|
||||
memcpy(&root->ai1, &info->alloc_extent, sizeof(info->alloc_extent));
|
||||
memcpy(&root->ai2, &info->reserve_extent, sizeof(info->reserve_extent));
|
||||
root->alloc_extent = &root->ai1;
|
||||
root->reserve_extent = &root->ai2;
|
||||
printf("setup done reading root %p, used %lu available %lu\n", root, root->alloc_extent->num_used, root->alloc_extent->num_blocks);
|
||||
printf("setup done reading root %p, reserve used %lu available %lu\n", root, root->reserve_extent->num_used, root->reserve_extent->num_blocks);
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -147,6 +118,8 @@ struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
|
|||
free(root);
|
||||
return NULL;
|
||||
}
|
||||
INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
|
||||
INIT_RADIX_TREE(&extent_root->cache_radix, GFP_KERNEL);
|
||||
ret = pread(fp, super, sizeof(struct ctree_super_block),
|
||||
CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
|
||||
if (ret == 0 || super->root_info.tree_root == 0) {
|
||||
|
|
@ -168,8 +141,6 @@ struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
|
|||
static int __update_root(struct ctree_root *root, struct ctree_root_info *info)
|
||||
{
|
||||
info->tree_root = root->node->blocknr;
|
||||
memcpy(&info->alloc_extent, root->alloc_extent, sizeof(struct alloc_extent));
|
||||
memcpy(&info->reserve_extent, root->reserve_extent, sizeof(struct alloc_extent));
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
|
@ -201,6 +172,7 @@ int close_ctree(struct ctree_root *root)
|
|||
void tree_block_release(struct ctree_root *root, struct tree_buffer *buf)
|
||||
{
|
||||
buf->count--;
|
||||
write_tree_block(root, buf);
|
||||
if (buf->count < 0)
|
||||
BUG();
|
||||
if (buf->count == 0) {
|
||||
|
|
|
|||
|
|
@ -11,11 +11,11 @@ struct tree_buffer {
|
|||
};
|
||||
|
||||
struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr);
|
||||
struct tree_buffer *find_tree_block(struct ctree_root *root, u64 blocknr);
|
||||
int write_tree_block(struct ctree_root *root, struct tree_buffer *buf);
|
||||
struct ctree_root *open_ctree(char *filename, struct ctree_super_block *s);
|
||||
int close_ctree(struct ctree_root *root);
|
||||
void tree_block_release(struct ctree_root *root, struct tree_buffer *buf);
|
||||
struct tree_buffer *alloc_free_block(struct ctree_root *root);
|
||||
int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s);
|
||||
int mkfs(int fd);
|
||||
|
||||
|
|
|
|||
37
mkfs.c
37
mkfs.c
|
|
@ -23,17 +23,10 @@ int mkfs(int fd)
|
|||
info[0].blocknr = 16;
|
||||
info[0].objectid = 1;
|
||||
info[0].tree_root = 17;
|
||||
info[0].alloc_extent.blocknr = 0;
|
||||
info[0].alloc_extent.num_blocks = 64;
|
||||
/* 0-17 are used (inclusive) */
|
||||
info[0].alloc_extent.num_used = 18;
|
||||
|
||||
info[1].blocknr = 16;
|
||||
info[1].objectid = 2;
|
||||
info[1].tree_root = 64;
|
||||
info[1].alloc_extent.blocknr = 64;
|
||||
info[1].alloc_extent.num_blocks = 64;
|
||||
info[1].alloc_extent.num_used = 1;
|
||||
info[1].tree_root = 18;
|
||||
ret = pwrite(fd, info, sizeof(info),
|
||||
CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
|
||||
if (ret != sizeof(info))
|
||||
|
|
@ -48,24 +41,36 @@ int mkfs(int fd)
|
|||
return -1;
|
||||
|
||||
empty_leaf.header.parentid = 2;
|
||||
empty_leaf.header.blocknr = 64;
|
||||
empty_leaf.header.nritems = 2;
|
||||
empty_leaf.header.blocknr = 18;
|
||||
empty_leaf.header.nritems = 3;
|
||||
|
||||
/* item1, reserve blocks 0-16 */
|
||||
item.key.objectid = 0;
|
||||
item.key.offset = 64;
|
||||
item.key.offset = 17;
|
||||
item.key.flags = 0;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item);
|
||||
item.size = sizeof(struct extent_item);
|
||||
extent_item.refs = 1;
|
||||
extent_item.owner = 1;
|
||||
extent_item.owner = 0;
|
||||
memcpy(empty_leaf.items, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
item.key.objectid = 64;
|
||||
item.key.offset = 64;
|
||||
|
||||
/* item2, give block 17 to the root */
|
||||
item.key.objectid = 17;
|
||||
item.key.offset = 1;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 2;
|
||||
extent_item.owner = 2;
|
||||
extent_item.owner = 1;
|
||||
memcpy(empty_leaf.items + 1, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 64 * CTREE_BLOCKSIZE);
|
||||
|
||||
/* item3, give block 18 for the extent root */
|
||||
item.key.objectid = 18;
|
||||
item.key.offset = 1;
|
||||
item.offset = LEAF_DATA_SIZE - sizeof(struct extent_item) * 3;
|
||||
extent_item.owner = 2;
|
||||
memcpy(empty_leaf.items + 2, &item, sizeof(item));
|
||||
memcpy(empty_leaf.data + item.offset, &extent_item, item.size);
|
||||
ret = pwrite(fd, &empty_leaf, sizeof(empty_leaf), 18 * CTREE_BLOCKSIZE);
|
||||
if (ret != sizeof(empty_leaf))
|
||||
return -1;
|
||||
return 0;
|
||||
|
|
|
|||
Loading…
Reference in New Issue