Btrfs: early reference counting
Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
David Woodhouse
parent
77ce6846c4
commit
02217ed299
6 changed files with 145 additions and 80 deletions
153
fs/btrfs/ctree.c
153
fs/btrfs/ctree.c
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@ -34,6 +34,37 @@ void release_path(struct ctree_root *root, struct ctree_path *p)
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memset(p, 0, sizeof(*p));
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}
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int btrfs_cow_block(struct ctree_root *root,
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struct tree_buffer *buf,
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struct tree_buffer *parent,
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int parent_slot,
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struct tree_buffer **cow_ret)
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{
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struct tree_buffer *cow;
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if (!list_empty(&buf->dirty)) {
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*cow_ret = buf;
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return 0;
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}
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cow = alloc_free_block(root);
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memcpy(&cow->node, &buf->node, sizeof(buf->node));
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cow->node.header.blocknr = cow->blocknr;
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*cow_ret = cow;
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if (buf == root->node) {
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root->node = cow;
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cow->count++;
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tree_block_release(root, buf);
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} else {
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parent->node.blockptrs[parent_slot] = cow->blocknr;
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BUG_ON(list_empty(&parent->dirty));
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}
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if (0 && root != root->extent_root && !is_leaf(cow->node.header.flags)) {
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btrfs_inc_ref(root, cow);
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}
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tree_block_release(root, buf);
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return 0;
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}
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/*
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* The leaf data grows from end-to-front in the node.
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* this returns the address of the start of the last item,
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@ -263,6 +294,8 @@ static int balance_level(struct ctree_root *root, struct ctree_path *path,
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/* first, try to make some room in the middle buffer */
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if (left_buf) {
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btrfs_cow_block(root, left_buf, parent_buf,
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pslot - 1, &left_buf);
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left = &left_buf->node;
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orig_slot += left->header.nritems;
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wret = push_node_left(root, left_buf, mid_buf);
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@ -274,6 +307,8 @@ static int balance_level(struct ctree_root *root, struct ctree_path *path,
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* then try to empty the right most buffer into the middle
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*/
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if (right_buf) {
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btrfs_cow_block(root, right_buf, parent_buf,
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pslot + 1, &right_buf);
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right = &right_buf->node;
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wret = push_node_left(root, mid_buf, right_buf);
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if (wret < 0)
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@ -293,9 +328,7 @@ static int balance_level(struct ctree_root *root, struct ctree_path *path,
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} else {
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memcpy(parent->keys + pslot + 1, right->keys,
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sizeof(struct key));
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wret = dirty_tree_block(root, parent_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&parent_buf->dirty));
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}
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}
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if (mid->header.nritems == 1) {
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@ -330,9 +363,7 @@ static int balance_level(struct ctree_root *root, struct ctree_path *path,
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} else {
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/* update the parent key to reflect our changes */
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memcpy(parent->keys + pslot, mid->keys, sizeof(struct key));
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wret = dirty_tree_block(root, parent_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&parent_buf->dirty));
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}
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/* update the path */
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@ -375,9 +406,10 @@ static int balance_level(struct ctree_root *root, struct ctree_path *path,
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* possible)
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*/
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int search_slot(struct ctree_root *root, struct key *key,
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struct ctree_path *p, int ins_len)
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struct ctree_path *p, int ins_len, int cow)
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{
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struct tree_buffer *b;
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struct tree_buffer *cow_buf;
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struct node *c;
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int slot;
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int ret;
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@ -387,8 +419,15 @@ int search_slot(struct ctree_root *root, struct key *key,
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b = root->node;
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b->count++;
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while (b) {
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level = node_level(b->node.header.flags);
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if (cow) {
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int wret;
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wret = btrfs_cow_block(root, b, p->nodes[level + 1],
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p->slots[level + 1], &cow_buf);
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b = cow_buf;
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}
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BUG_ON(!cow && ins_len);
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c = &b->node;
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level = node_level(c->header.flags);
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p->nodes[level] = b;
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ret = check_block(p, level);
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if (ret)
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@ -453,7 +492,6 @@ static int fixup_low_keys(struct ctree_root *root,
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{
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int i;
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int ret = 0;
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int wret;
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for (i = level; i < MAX_LEVEL; i++) {
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struct node *t;
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int tslot = path->slots[i];
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@ -461,9 +499,7 @@ static int fixup_low_keys(struct ctree_root *root,
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break;
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t = &path->nodes[i]->node;
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memcpy(t->keys + tslot, key, sizeof(*key));
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wret = dirty_tree_block(root, path->nodes[i]);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&path->nodes[i]->dirty));
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if (tslot != 0)
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break;
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}
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@ -486,7 +522,6 @@ static int push_node_left(struct ctree_root *root, struct tree_buffer *dst_buf,
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int src_nritems;
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int dst_nritems;
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int ret = 0;
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int wret;
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src_nritems = src->header.nritems;
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dst_nritems = dst->header.nritems;
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@ -511,13 +546,8 @@ static int push_node_left(struct ctree_root *root, struct tree_buffer *dst_buf,
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src->header.nritems -= push_items;
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dst->header.nritems += push_items;
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wret = dirty_tree_block(root, src_buf);
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if (wret < 0)
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ret = wret;
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wret = dirty_tree_block(root, dst_buf);
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if (wret < 0)
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ret = wret;
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BUG_ON(list_empty(&src_buf->dirty));
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BUG_ON(list_empty(&dst_buf->dirty));
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return ret;
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}
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@ -541,7 +571,6 @@ static int balance_node_right(struct ctree_root *root,
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int src_nritems;
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int dst_nritems;
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int ret = 0;
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int wret;
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src_nritems = src->header.nritems;
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dst_nritems = dst->header.nritems;
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@ -569,13 +598,8 @@ static int balance_node_right(struct ctree_root *root,
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src->header.nritems -= push_items;
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dst->header.nritems += push_items;
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wret = dirty_tree_block(root, src_buf);
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if (wret < 0)
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ret = wret;
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wret = dirty_tree_block(root, dst_buf);
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if (wret < 0)
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ret = wret;
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BUG_ON(list_empty(&src_buf->dirty));
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BUG_ON(list_empty(&dst_buf->dirty));
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return ret;
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}
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@ -615,7 +639,6 @@ static int insert_new_root(struct ctree_root *root,
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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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dirty_tree_block(root, t);
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path->nodes[level] = t;
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path->slots[level] = 0;
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return 0;
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@ -655,7 +678,7 @@ static int insert_ptr(struct ctree_root *root,
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lower->header.nritems++;
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if (lower->keys[1].objectid == 0)
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BUG();
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dirty_tree_block(root, path->nodes[level]);
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BUG_ON(list_empty(&path->nodes[level]->dirty));
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return 0;
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}
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@ -701,12 +724,7 @@ static int split_node(struct ctree_root *root, struct ctree_path *path,
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c->header.nritems = mid;
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ret = 0;
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wret = dirty_tree_block(root, t);
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if (wret)
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ret = wret;
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wret = dirty_tree_block(root, split_buffer);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&t->dirty));
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wret = insert_ptr(root, path, split->keys, split_buffer->blocknr,
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path->slots[level + 1] + 1, level + 1);
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if (wret)
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@ -778,6 +796,15 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
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tree_block_release(root, right_buf);
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return 1;
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}
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/* cow and double check */
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btrfs_cow_block(root, right_buf, upper, slot + 1, &right_buf);
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right = &right_buf->leaf;
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free_space = leaf_free_space(right);
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if (free_space < data_size + sizeof(struct item)) {
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tree_block_release(root, right_buf);
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return 1;
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}
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for (i = left->header.nritems - 1; i >= 0; i--) {
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item = left->items + i;
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if (path->slots[0] == i)
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@ -818,11 +845,12 @@ static int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
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}
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left->header.nritems -= push_items;
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dirty_tree_block(root, left_buf);
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dirty_tree_block(root, right_buf);
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BUG_ON(list_empty(&left_buf->dirty));
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BUG_ON(list_empty(&right_buf->dirty));
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memcpy(upper->node.keys + slot + 1,
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&right->items[0].key, sizeof(struct key));
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dirty_tree_block(root, upper);
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BUG_ON(list_empty(&upper->dirty));
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/* then fixup the leaf pointer in the path */
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if (path->slots[0] >= left->header.nritems) {
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path->slots[0] -= left->header.nritems;
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@ -869,6 +897,16 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
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tree_block_release(root, t);
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return 1;
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}
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/* cow and double check */
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btrfs_cow_block(root, t, path->nodes[1], slot - 1, &t);
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left = &t->leaf;
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free_space = leaf_free_space(left);
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if (free_space < data_size + sizeof(struct item)) {
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tree_block_release(root, t);
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return 1;
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}
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for (i = 0; i < right->header.nritems; i++) {
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item = right->items + i;
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if (path->slots[0] == i)
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@ -912,12 +950,8 @@ static int push_leaf_left(struct ctree_root *root, struct ctree_path *path,
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push_space = right->items[i].offset;
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}
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wret = dirty_tree_block(root, t);
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if (wret)
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ret = wret;
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wret = dirty_tree_block(root, right_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&t->dirty));
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BUG_ON(list_empty(&right_buf->dirty));
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wret = fixup_low_keys(root, path, &right->items[0].key, 1);
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if (wret)
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@ -968,6 +1002,7 @@ static int split_leaf(struct ctree_root *root, struct ctree_path *path,
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if (wret < 0)
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return wret;
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}
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l_buf = path->nodes[0];
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l = &l_buf->leaf;
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@ -1022,13 +1057,8 @@ static int split_leaf(struct ctree_root *root, struct ctree_path *path,
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right_buffer->blocknr, path->slots[1] + 1, 1);
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if (wret)
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ret = wret;
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wret = dirty_tree_block(root, right_buffer);
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if (wret)
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ret = wret;
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wret = dirty_tree_block(root, l_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&right_buffer->dirty));
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BUG_ON(list_empty(&l_buf->dirty));
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BUG_ON(path->slots[0] != slot);
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if (mid <= slot) {
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tree_block_release(root, path->nodes[0]);
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@ -1049,7 +1079,6 @@ int insert_item(struct ctree_root *root, struct key *key,
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void *data, int data_size)
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{
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int ret = 0;
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int wret;
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int slot;
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int slot_orig;
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struct leaf *leaf;
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@ -1062,7 +1091,7 @@ int insert_item(struct ctree_root *root, struct key *key,
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if (!root->node)
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BUG();
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init_path(&path);
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ret = search_slot(root, key, &path, data_size);
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ret = search_slot(root, key, &path, data_size, 1);
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if (ret == 0) {
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release_path(root, &path);
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return -EEXIST;
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@ -1114,10 +1143,7 @@ int insert_item(struct ctree_root *root, struct key *key,
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if (slot == 0)
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ret = fixup_low_keys(root, &path, key, 1);
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wret = dirty_tree_block(root, leaf_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&leaf_buf->dirty));
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if (leaf_free_space(leaf) < 0)
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BUG();
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check_leaf(&path, 0);
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@ -1162,9 +1188,7 @@ static int del_ptr(struct ctree_root *root, struct ctree_path *path, int level,
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if (wret)
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ret = wret;
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}
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wret = dirty_tree_block(root, parent);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&parent->dirty));
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return ret;
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}
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@ -1205,7 +1229,7 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
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if (leaf->header.nritems == 0) {
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if (leaf_buf == root->node) {
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leaf->header.flags = node_level(0);
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dirty_tree_block(root, leaf_buf);
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BUG_ON(list_empty(&leaf_buf->dirty));
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} else {
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clean_tree_block(root, leaf_buf);
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wret = del_ptr(root, path, 1, path->slots[1]);
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@ -1223,9 +1247,7 @@ int del_item(struct ctree_root *root, struct ctree_path *path)
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if (wret)
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ret = wret;
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}
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wret = dirty_tree_block(root, leaf_buf);
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if (wret)
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ret = wret;
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BUG_ON(list_empty(&leaf_buf->dirty));
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/* delete the leaf if it is mostly empty */
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if (used < LEAF_DATA_SIZE / 3) {
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@ -1304,3 +1326,4 @@ 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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@ -142,8 +142,9 @@ struct ctree_path {
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};
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struct tree_buffer *alloc_free_block(struct ctree_root *root);
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int btrfs_inc_ref(struct ctree_root *root, struct tree_buffer *buf);
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int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks);
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int search_slot(struct ctree_root *root, struct key *key, struct ctree_path *p, int ins_len);
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int search_slot(struct ctree_root *root, struct key *key, struct ctree_path *p, int ins_len, int cow);
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void release_path(struct ctree_root *root, struct ctree_path *p);
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void init_path(struct ctree_path *p);
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int del_item(struct ctree_root *root, struct ctree_path *path);
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@ -260,6 +260,8 @@ void tree_block_release(struct ctree_root *root, struct tree_buffer *buf)
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if (buf->count < 0)
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BUG();
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if (buf->count == 0) {
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BUG_ON(!list_empty(&buf->cache));
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BUG_ON(!list_empty(&buf->dirty));
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if (!radix_tree_lookup(&root->cache_radix, buf->blocknr))
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BUG();
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radix_tree_delete(&root->cache_radix, buf->blocknr);
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@ -15,6 +15,39 @@
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*/
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#define CTREE_EXTENT_PENDING 0
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static int inc_block_ref(struct ctree_root *root, u64 blocknr)
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{
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struct ctree_path path;
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int ret;
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struct key key;
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struct leaf *l;
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struct extent_item *item;
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init_path(&path);
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key.objectid = blocknr;
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key.flags = 0;
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key.offset = 1;
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ret = search_slot(root->extent_root, &key, &path, 0, 1);
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BUG_ON(ret != 0);
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l = &path.nodes[0]->leaf;
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item = (struct extent_item *)(l->data +
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l->items[path.slots[0]].offset);
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item->refs++;
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BUG_ON(list_empty(&path.nodes[0]->dirty));
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release_path(root->extent_root, &path);
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return 0;
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}
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int btrfs_inc_ref(struct ctree_root *root, struct tree_buffer *buf)
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{
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u64 blocknr;
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int i;
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for (i = 0; i < buf->node.header.nritems; i++) {
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blocknr = buf->node.blockptrs[i];
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inc_block_ref(root, blocknr);
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}
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return 0;
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}
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/*
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* find all the blocks marked as pending in the radix tree and remove
|
||||
* them from the extent map
|
||||
|
|
@ -39,7 +72,7 @@ static int del_pending_extents(struct ctree_root *extent_root)
|
|||
key.flags = 0;
|
||||
key.offset = 1;
|
||||
init_path(&path);
|
||||
ret = search_slot(extent_root, &key, &path, -1);
|
||||
ret = search_slot(extent_root, &key, &path, -1, 1);
|
||||
if (ret) {
|
||||
print_tree(extent_root, extent_root->node);
|
||||
printf("unable to find %Lu\n", key.objectid);
|
||||
|
|
@ -83,7 +116,7 @@ int free_extent(struct ctree_root *root, u64 blocknr, u64 num_blocks)
|
|||
return 0;
|
||||
}
|
||||
init_path(&path);
|
||||
ret = search_slot(extent_root, &key, &path, -1);
|
||||
ret = search_slot(extent_root, &key, &path, -1, 1);
|
||||
if (ret) {
|
||||
print_tree(extent_root, extent_root->node);
|
||||
printf("failed to find %Lu\n", key.objectid);
|
||||
|
|
@ -124,7 +157,7 @@ static int find_free_extent(struct ctree_root *orig_root, u64 num_blocks,
|
|||
ins->offset = 0;
|
||||
ins->flags = 0;
|
||||
start_found = 0;
|
||||
ret = search_slot(root, ins, &path, 0);
|
||||
ret = search_slot(root, ins, &path, 0, 0);
|
||||
if (ret < 0)
|
||||
goto error;
|
||||
|
||||
|
|
@ -221,6 +254,8 @@ static int insert_pending_extents(struct ctree_root *extent_root)
|
|||
ret = insert_item(extent_root, &key, &item,
|
||||
sizeof(item));
|
||||
if (ret) {
|
||||
printf("%Lu already in tree\n", key.objectid);
|
||||
print_tree(extent_root, extent_root->node);
|
||||
BUG();
|
||||
// FIXME undo it and return sane
|
||||
return ret;
|
||||
|
|
@ -228,6 +263,7 @@ static int insert_pending_extents(struct ctree_root *extent_root)
|
|||
radix_tree_tag_clear(&extent_root->cache_radix,
|
||||
gang[i]->blocknr,
|
||||
CTREE_EXTENT_PENDING);
|
||||
printf("%Lu is not pending\n", gang[i]->blocknr);
|
||||
tree_block_release(extent_root, gang[i]);
|
||||
}
|
||||
}
|
||||
|
|
@ -266,15 +302,18 @@ int alloc_extent(struct ctree_root *root, u64 num_blocks, u64 search_start,
|
|||
if (pending_ret)
|
||||
return pending_ret;
|
||||
*buf = find_tree_block(root, ins->objectid);
|
||||
dirty_tree_block(root, *buf);
|
||||
return 0;
|
||||
}
|
||||
/* we're allocating an extent for the extent tree, don't recurse */
|
||||
BUG_ON(ins->offset != 1);
|
||||
*buf = find_tree_block(root, ins->objectid);
|
||||
BUG_ON(!*buf);
|
||||
printf("%Lu is pending\n", ins->objectid);
|
||||
radix_tree_tag_set(&root->cache_radix, ins->objectid,
|
||||
CTREE_EXTENT_PENDING);
|
||||
(*buf)->count++;
|
||||
dirty_tree_block(root, *buf);
|
||||
return 0;
|
||||
|
||||
}
|
||||
|
|
|
|||
|
|
@ -19,7 +19,7 @@ int main(int ac, char **av) {
|
|||
int i;
|
||||
int num;
|
||||
int ret;
|
||||
int run_size = 100000;
|
||||
int run_size = 1024;
|
||||
int max_key = 100000000;
|
||||
int tree_size = 0;
|
||||
struct ctree_path path;
|
||||
|
|
@ -57,7 +57,7 @@ int main(int ac, char **av) {
|
|||
init_path(&path);
|
||||
if (i % 10000 == 0)
|
||||
fprintf(stderr, "search %d:%d\n", num, i);
|
||||
ret = search_slot(root, &ins, &path, 0);
|
||||
ret = search_slot(root, &ins, &path, 0, 0);
|
||||
if (ret) {
|
||||
print_tree(root, root->node);
|
||||
printf("unable to find %d\n", num);
|
||||
|
|
@ -79,7 +79,7 @@ int main(int ac, char **av) {
|
|||
num = next_key(i, max_key);
|
||||
ins.objectid = num;
|
||||
init_path(&path);
|
||||
ret = search_slot(root, &ins, &path, -1);
|
||||
ret = search_slot(root, &ins, &path, -1, 1);
|
||||
if (!ret) {
|
||||
if (i % 10000 == 0)
|
||||
fprintf(stderr, "del %d:%d\n", num, i);
|
||||
|
|
@ -117,7 +117,7 @@ int main(int ac, char **av) {
|
|||
init_path(&path);
|
||||
if (i % 10000 == 0)
|
||||
fprintf(stderr, "search %d:%d\n", num, i);
|
||||
ret = search_slot(root, &ins, &path, 0);
|
||||
ret = search_slot(root, &ins, &path, 0, 0);
|
||||
if (ret) {
|
||||
print_tree(root, root->node);
|
||||
printf("unable to find %d\n", num);
|
||||
|
|
@ -131,7 +131,7 @@ int main(int ac, char **av) {
|
|||
int slot;
|
||||
ins.objectid = (u64)-1;
|
||||
init_path(&path);
|
||||
ret = search_slot(root, &ins, &path, -1);
|
||||
ret = search_slot(root, &ins, &path, -1, 1);
|
||||
if (ret == 0)
|
||||
BUG();
|
||||
|
||||
|
|
|
|||
|
|
@ -93,7 +93,7 @@ static int del_one(struct ctree_root *root, struct radix_tree_root *radix)
|
|||
ret = setup_key(radix, &key, 1);
|
||||
if (ret < 0)
|
||||
return 0;
|
||||
ret = search_slot(root, &key, &path, -1);
|
||||
ret = search_slot(root, &key, &path, -1, 1);
|
||||
if (ret)
|
||||
goto error;
|
||||
ret = del_item(root, &path);
|
||||
|
|
@ -118,7 +118,7 @@ static int lookup_item(struct ctree_root *root, struct radix_tree_root *radix)
|
|||
ret = setup_key(radix, &key, 1);
|
||||
if (ret < 0)
|
||||
return 0;
|
||||
ret = search_slot(root, &key, &path, 0);
|
||||
ret = search_slot(root, &key, &path, 0, 1);
|
||||
release_path(root, &path);
|
||||
if (ret)
|
||||
goto error;
|
||||
|
|
@ -137,7 +137,7 @@ static int lookup_enoent(struct ctree_root *root, struct radix_tree_root *radix)
|
|||
ret = setup_key(radix, &key, 0);
|
||||
if (ret < 0)
|
||||
return ret;
|
||||
ret = search_slot(root, &key, &path, 0);
|
||||
ret = search_slot(root, &key, &path, 0, 0);
|
||||
release_path(root, &path);
|
||||
if (ret <= 0)
|
||||
goto error;
|
||||
|
|
@ -163,7 +163,7 @@ static int empty_tree(struct ctree_root *root, struct radix_tree_root *radix,
|
|||
key.objectid = (unsigned long)-1;
|
||||
while(nr-- >= 0) {
|
||||
init_path(&path);
|
||||
ret = search_slot(root, &key, &path, -1);
|
||||
ret = search_slot(root, &key, &path, -1, 1);
|
||||
if (ret < 0) {
|
||||
release_path(root, &path);
|
||||
return ret;
|
||||
|
|
@ -216,7 +216,7 @@ static int fill_tree(struct ctree_root *root, struct radix_tree_root *radix,
|
|||
return ret;
|
||||
}
|
||||
}
|
||||
if (i % 10000 == 0) {
|
||||
if (i && i % 10000 == 0) {
|
||||
printf("bigfill %d\n", i);
|
||||
}
|
||||
if (!keep_running)
|
||||
|
|
@ -263,7 +263,7 @@ static int fill_radix(struct ctree_root *root, struct radix_tree_root *radix)
|
|||
key.objectid = (unsigned long)-1;
|
||||
while(1) {
|
||||
init_path(&path);
|
||||
ret = search_slot(root, &key, &path, 0);
|
||||
ret = search_slot(root, &key, &path, 0, 0);
|
||||
if (ret < 0) {
|
||||
release_path(root, &path);
|
||||
return ret;
|
||||
|
|
|
|||
Loading…
Reference in a new issue