mirror of
https://github.com/torvalds/linux.git
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Btrfs: extent fixes
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
parent
06ed4b316e
commit
cfaa72952f
@ -354,6 +354,7 @@ int __insert_ptr(struct ctree_root *root,
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c->header.nritems = 2;
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c->header.flags = node_level(level);
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c->header.blocknr = t->blocknr;
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c->header.parentid = root->node->node.header.parentid;
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lower = &path->nodes[level-1]->node;
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if (is_leaf(lower->header.flags))
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lower_key = &((struct leaf *)lower)->items[0].key;
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@ -363,7 +364,7 @@ int __insert_ptr(struct ctree_root *root,
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memcpy(c->keys + 1, key, sizeof(struct key));
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c->blockptrs[0] = path->nodes[level-1]->blocknr;
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c->blockptrs[1] = blocknr;
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/* the path has an extra ref to root->node */
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/* the super has an extra ref to root->node */
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tree_block_release(root, root->node);
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root->node = t;
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t->count++;
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@ -439,6 +440,7 @@ int insert_ptr(struct ctree_root *root,
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b = &b_buffer->node;
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b->header.flags = c->header.flags;
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b->header.blocknr = b_buffer->blocknr;
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b->header.parentid = root->node->node.header.parentid;
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mid = (c->header.nritems + 1) / 2;
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memcpy(b->keys, c->keys + mid,
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(c->header.nritems - mid) * sizeof(struct key));
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@ -642,6 +644,7 @@ int split_leaf(struct ctree_root *root, struct ctree_path *path, int data_size)
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right->header.nritems = nritems - mid;
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right->header.blocknr = right_buffer->blocknr;
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right->header.flags = node_level(0);
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right->header.parentid = root->node->node.header.parentid;
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data_copy_size = l->items[mid].offset + l->items[mid].size -
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leaf_data_end(l);
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memcpy(right->items, l->items + mid,
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@ -689,8 +692,12 @@ 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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#if 0
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struct tree_buffer *t;
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t = alloc_free_block(root);
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BUG_ON(!t);
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@ -699,6 +706,7 @@ int insert_item(struct ctree_root *root, struct key *key,
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t->node.header.blocknr = t->blocknr;
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root->node = t;
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write_tree_block(root, t);
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#endif
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}
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init_path(&path);
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ret = search_slot(root, key, &path);
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@ -758,7 +766,6 @@ int insert_item(struct ctree_root *root, struct key *key,
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if (leaf_free_space(leaf) < 0)
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BUG();
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release_path(root, &path);
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refill_alloc_extent(root);
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return 0;
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}
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@ -893,7 +900,7 @@ int next_leaf(struct ctree_root *root, struct ctree_path *path)
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int level = 1;
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u64 blocknr;
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struct tree_buffer *c;
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struct tree_buffer *next;
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struct tree_buffer *next = NULL;
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while(level < MAX_LEVEL) {
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if (!path->nodes[level])
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@ -905,6 +912,8 @@ int next_leaf(struct ctree_root *root, struct ctree_path *path)
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continue;
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}
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blocknr = c->node.blockptrs[slot];
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if (next)
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tree_block_release(root, next);
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next = read_tree_block(root, blocknr);
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break;
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}
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@ -922,7 +931,7 @@ 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 *root, u64 num_blocks, u64 search_start,
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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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{
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struct ctree_path path;
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@ -934,6 +943,7 @@ int alloc_extent(struct ctree_root *root, u64 num_blocks, u64 search_start,
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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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@ -974,13 +984,18 @@ int alloc_extent(struct ctree_root *root, u64 num_blocks, u64 search_start,
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start_found = 1;
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last_block = key->objectid + key->offset;
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path.slots[0]++;
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printf("last block is not %lu\n", last_block);
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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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ret = insert_item(root, ins, &extent_item, sizeof(extent_item));
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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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}
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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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}
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@ -991,7 +1006,6 @@ static int refill_alloc_extent(struct ctree_root *root)
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int ret;
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int min_blocks = MAX_LEVEL * 2;
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printf("refill alloc root %p, numused %lu total %lu\n", root, ae->num_used, ae->num_blocks);
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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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@ -1007,9 +1021,9 @@ static int refill_alloc_extent(struct ctree_root *root)
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BUG();
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return 0;
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}
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// FIXME, this recurses
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ret = alloc_extent(root->extent_root,
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min_blocks * 2, 0, (unsigned long)-1, 0, &key);
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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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@ -1021,6 +1035,7 @@ void print_leaf(struct leaf *l)
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int i;
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int nr = l->header.nritems;
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struct item *item;
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struct extent_item *ei;
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printf("leaf %lu total ptrs %d free space %d\n", l->header.blocknr, nr,
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leaf_free_space(l));
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fflush(stdout);
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@ -1032,6 +1047,8 @@ void print_leaf(struct leaf *l)
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item->offset, item->size);
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fflush(stdout);
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printf("\t\titem data %.*s\n", item->size, l->data+item->offset);
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ei = (struct extent_item *)(l->data + item->offset);
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printf("\t\textent data %u %lu\n", ei->refs, ei->owner);
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fflush(stdout);
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}
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}
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@ -1080,8 +1097,8 @@ void print_tree(struct ctree_root *root, struct tree_buffer *t)
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/* for testing only */
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int next_key(int i, int max_key) {
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// return rand() % max_key;
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return i;
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return rand() % max_key;
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// return i;
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}
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int main() {
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@ -1092,15 +1109,20 @@ int main() {
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int i;
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int num;
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int ret;
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int run_size = 256;
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int run_size = 10000;
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int max_key = 100000000;
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int tree_size = 0;
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struct ctree_path path;
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struct ctree_super_block super;
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radix_tree_init();
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root = open_ctree("dbfile");
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root = open_ctree("dbfile", &super);
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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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print_tree(root->extent_root, root->extent_root->node);
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srand(55);
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for (i = 0; i < run_size; i++) {
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@ -1112,22 +1134,20 @@ int main() {
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ins.objectid = num;
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ins.offset = 0;
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ins.flags = 0;
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printf("insert %d\n", i);
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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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printf("done insert %d\n", i);
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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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// 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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exit(1);
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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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root = open_ctree("dbfile");
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root = open_ctree("dbfile", &super);
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printf("starting search\n");
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srand(55);
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for (i = 0; i < run_size; i++) {
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@ -1142,8 +1162,9 @@ int main() {
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}
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release_path(root, &path);
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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");
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root = open_ctree("dbfile", &super);
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printf("node %p level %d total ptrs %d free spc %lu\n", root->node,
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node_level(root->node->node.header.flags),
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root->node->node.header.nritems,
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@ -1174,8 +1195,9 @@ int main() {
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if (!ret)
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tree_size++;
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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");
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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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for (i = 0; i < run_size; i++) {
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@ -1221,6 +1243,7 @@ int main() {
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}
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release_path(root, &path);
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}
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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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return 0;
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@ -57,6 +57,11 @@ struct ctree_root_info {
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u64 snapuuid[2]; /* root specific uuid */
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} __attribute__ ((__packed__));
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struct ctree_super_block {
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struct ctree_root_info root_info;
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struct ctree_root_info extent_info;
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} __attribute__ ((__packed__));
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struct item {
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struct key key;
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u16 offset;
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@ -15,7 +15,7 @@ static int allocated_blocks = 0;
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static int get_free_block(struct ctree_root *root, u64 *block)
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{
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struct stat st;
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int ret;
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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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@ -30,9 +30,14 @@ static int get_free_block(struct ctree_root *root, u64 *block)
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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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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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}
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@ -81,11 +86,7 @@ struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
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buf = radix_tree_lookup(&root->cache_radix, blocknr);
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if (buf) {
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buf->count++;
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if (buf->blocknr != blocknr)
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BUG();
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if (buf->blocknr != buf->node.header.blocknr)
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BUG();
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return buf;
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goto test;
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}
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buf = alloc_tree_block(root, blocknr);
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if (!buf)
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@ -95,8 +96,11 @@ struct tree_buffer *read_tree_block(struct ctree_root *root, u64 blocknr)
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free(buf);
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return NULL;
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}
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test:
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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();
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return buf;
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}
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@ -111,36 +115,30 @@ int write_tree_block(struct ctree_root *root, struct tree_buffer *buf)
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ret = pwrite(root->fp, &buf->node, CTREE_BLOCKSIZE, offset);
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if (ret != CTREE_BLOCKSIZE)
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return ret;
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if (buf == root->node)
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return update_root_block(root);
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return 0;
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}
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struct ctree_super_block {
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struct ctree_root_info root_info;
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struct ctree_root_info extent_info;
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} __attribute__ ((__packed__));
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static int __setup_root(struct ctree_root *root, struct ctree_root *extent_root,
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struct ctree_root_info *info, int fp)
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{
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INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
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root->fp = fp;
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root->node = NULL;
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root->node = read_tree_block(root, info->tree_root);
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root->extent_root = extent_root;
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memcpy(&root->ai1, &info->alloc_extent, sizeof(info->alloc_extent));
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memcpy(&root->ai2, &info->reserve_extent, sizeof(info->reserve_extent));
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root->alloc_extent = &root->ai1;
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root->reserve_extent = &root->ai2;
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INIT_RADIX_TREE(&root->cache_radix, GFP_KERNEL);
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printf("setup done reading root %p, used %lu\n", root, root->alloc_extent->num_used);
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printf("setup done reading root %p, used %lu available %lu\n", root, root->alloc_extent->num_used, root->alloc_extent->num_blocks);
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printf("setup done reading root %p, reserve used %lu available %lu\n", root, root->reserve_extent->num_used, root->reserve_extent->num_blocks);
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return 0;
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}
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struct ctree_root *open_ctree(char *filename)
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struct ctree_root *open_ctree(char *filename, struct ctree_super_block *super)
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{
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struct ctree_root *root = malloc(sizeof(struct ctree_root));
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struct ctree_root *extent_root = malloc(sizeof(struct ctree_root));
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struct ctree_super_block super;
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int fp;
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int ret;
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@ -149,48 +147,61 @@ struct ctree_root *open_ctree(char *filename)
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free(root);
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return NULL;
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}
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ret = pread(fp, &super, sizeof(struct ctree_super_block),
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ret = pread(fp, super, sizeof(struct ctree_super_block),
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CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret == 0) {
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ret = mkfs(fp);
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if (ret)
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return NULL;
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ret = pread(fp, &super, sizeof(struct ctree_super_block),
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ret = pread(fp, super, sizeof(struct ctree_super_block),
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CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret != sizeof(struct ctree_super_block))
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return NULL;
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}
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BUG_ON(ret < 0);
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__setup_root(root, extent_root, &super.root_info, fp);
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__setup_root(extent_root, extent_root, &super.extent_info, fp);
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__setup_root(root, extent_root, &super->root_info, fp);
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__setup_root(extent_root, extent_root, &super->extent_info, fp);
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return root;
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}
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static int __update_root(struct ctree_root *root, struct ctree_root_info *info)
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{
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info->tree_root = root->node->blocknr;
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memcpy(&info->alloc_extent, root->alloc_extent, sizeof(struct alloc_extent));
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memcpy(&info->reserve_extent, root->reserve_extent, sizeof(struct alloc_extent));
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return 0;
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}
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int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s)
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{
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int ret;
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__update_root(root, &s->root_info);
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__update_root(root->extent_root, &s->extent_info);
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ret = pwrite(root->fp, s, sizeof(*s), CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
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if (ret != sizeof(*s)) {
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fprintf(stderr, "failed to write new super block err %d\n", ret);
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return ret;
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}
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return 0;
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}
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int close_ctree(struct ctree_root *root)
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{
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close(root->fp);
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if (root->node)
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tree_block_release(root, root->node);
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if (root->extent_root->node)
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tree_block_release(root->extent_root, root->extent_root->node);
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free(root);
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printf("on close %d blocks are allocated\n", allocated_blocks);
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return 0;
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}
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int update_root_block(struct ctree_root *root)
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{
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int ret;
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u64 root_block = root->node->blocknr;
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ret = pwrite(root->fp, &root_block, sizeof(u64), 0);
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if (ret != sizeof(u64))
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return ret;
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return 0;
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}
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void tree_block_release(struct ctree_root *root, struct tree_buffer *buf)
|
||||
{
|
||||
return;
|
||||
buf->count--;
|
||||
if (buf->count < 0)
|
||||
BUG();
|
||||
if (buf->count == 0) {
|
||||
if (!radix_tree_lookup(&root->cache_radix, buf->blocknr))
|
||||
BUG();
|
||||
|
||||
@ -12,11 +12,11 @@ struct tree_buffer {
|
||||
|
||||
struct tree_buffer *read_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_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 update_root_block(struct ctree_root *root);
|
||||
int write_ctree_super(struct ctree_root *root, struct ctree_super_block *s);
|
||||
int mkfs(int fd);
|
||||
|
||||
#define CTREE_SUPER_INFO_OFFSET(bs) (16 * (bs))
|
||||
|
||||
@ -18,12 +18,13 @@ int mkfs(int fd)
|
||||
struct extent_item extent_item;
|
||||
int ret;
|
||||
|
||||
/* setup the super block area */
|
||||
memset(info, 0, sizeof(info));
|
||||
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 = 20;
|
||||
info[0].alloc_extent.num_blocks = 64;
|
||||
/* 0-17 are used (inclusive) */
|
||||
info[0].alloc_extent.num_used = 18;
|
||||
|
||||
@ -31,12 +32,14 @@ int mkfs(int fd)
|
||||
info[1].objectid = 2;
|
||||
info[1].tree_root = 64;
|
||||
info[1].alloc_extent.blocknr = 64;
|
||||
info[1].alloc_extent.num_blocks = 8;
|
||||
info[1].alloc_extent.num_blocks = 64;
|
||||
info[1].alloc_extent.num_used = 1;
|
||||
ret = pwrite(fd, info, sizeof(info),
|
||||
CTREE_SUPER_INFO_OFFSET(CTREE_BLOCKSIZE));
|
||||
if (ret != sizeof(info))
|
||||
return -1;
|
||||
|
||||
/* create leaves for the tree root and extent root */
|
||||
memset(&empty_leaf, 0, sizeof(empty_leaf));
|
||||
empty_leaf.header.parentid = 1;
|
||||
empty_leaf.header.blocknr = 17;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user