2 files changed, 39 insertions, 28 deletions

diff --git a/fs/btrfs/TODO b/fs/btrfs/TODO
new file mode 100644
index 000000000000..5c4395c3784a
--- /dev/null
+++ b/fs/btrfs/TODO
@@ -0,0 +1,25 @@
+* cleanup, add more error checking, get rid of BUG_ONs
+* Make IO functions look more like the page cache
+* Fix ENOSPC handling
+* make blocksize a mkfs parameter instead of #define
+* make a real mkfs and superblock
+* Add shadowing and transactions
+* Do checksumming
+* Define FS objects in terms of different item types
+* Add block mapping tree (simple dm layer)
+* Add simple tree locking (semaphore per tree)
+* Make allocator smarter
+* Port into the kernel
+* Add virtual filesystems, mountable snapshots
+* Get rid of struct ctree_path, limiting tree levels held at one time
+* Release
+* Do real tree locking
+* Add extent mirroring (backup copies of blocks)
+* Add fancy interface to get access to incremental backups
+* Add fancy striped extents to make big reads faster
+* Use relocation to try and fix write errors
+* Make allocator much smarter
+* xattrs (directory streams for regular files)
+* fsck
+* Scrub & defrag
+
diff --git a/fs/btrfs/ctree.c b/fs/btrfs/ctree.c
index 25dc7b2f7426..0aea94224ba3 100644
--- a/fs/btrfs/ctree.c
+++ b/fs/btrfs/ctree.c
@@ -167,29 +167,6 @@ int search_slot(struct ctree_root *root, struct key *key,
                                 b = p->nodes[level];
                                 c = &b->node;
                                 slot = p->slots[level];
-                        } else if (ins_len < 0 &&
-                                   c->header.nritems <= NODEPTRS_PER_BLOCK/4) {
-                                u64 blocknr = b->blocknr;
-                                slot = p->slots[level +1];
-                                b->count++;
-                                if (push_node_left(root, p, level))
-                                        push_node_right(root, p, level);
-                                if (c->header.nritems == 0 &&
-                                    level < MAX_LEVEL - 1 &&
-                                    p->nodes[level + 1]) {
-                                        int tslot = p->slots[level + 1];
-
-                                        p->slots[level + 1] = slot;
-                                        del_ptr(root, p, level + 1);
-                                        p->slots[level + 1] = tslot;
-                                        tree_block_release(root, b);
-                                        free_extent(root, blocknr, 1);
-                                } else {
-                                        tree_block_release(root, b);
-                                }
-                                b = p->nodes[level];
-                                c = &b->node;
-                                slot = p->slots[level];
                         }
                         b = read_tree_block(root, c->blockptrs[slot]);
                         continue;
@@ -618,7 +595,6 @@ int push_leaf_right(struct ctree_root *root, struct ctree_path *path,
                 &right->items[0].key, sizeof(struct key));
         write_tree_block(root, upper);
         /* then fixup the leaf pointer in the path */
-        // FIXME use nritems in here somehow
         if (path->slots[0] >= left->header.nritems) {
                 path->slots[0] -= left->header.nritems;
                 tree_block_release(root, path->nodes[0]);
@@ -847,8 +823,6 @@ int insert_item(struct ctree_root *root, struct key *key,
 
         slot = path.slots[0];
         BUG_ON(slot < 0);
-        if (slot == 0)
-                fixup_low_keys(root, &path, key, 1);
         if (slot != nritems) {
                 int i;
                 unsigned int old_data = leaf->items[slot].offset +
@@ -877,6 +851,8 @@ int insert_item(struct ctree_root *root, struct key *key,
         memcpy(leaf->data + data_end - data_size, data, data_size);
         leaf->header.nritems += 1;
         write_tree_block(root, leaf_buf);
+        if (slot == 0)
+                fixup_low_keys(root, &path, key, 1);
         if (leaf_free_space(leaf) < 0)
                 BUG();
         release_path(root, &path);
@@ -914,13 +890,23 @@ int del_ptr(struct ctree_root *root, struct ctree_path *path, int level)
                                 sizeof(u64) * (nritems - slot - 1));
                 }
                 node->header.nritems--;
-                write_tree_block(root, t);
                 blocknr = t->blocknr;
+                write_tree_block(root, t);
                 if (node->header.nritems != 0) {
+                        int tslot;
                         if (slot == 0)
                                 fixup_low_keys(root, path, node->keys,
                                                level + 1);
-                        break;
+                        tslot = path->slots[level + 1];
+                        t->count++;
+                        if (push_node_left(root, path, level))
+                                push_node_right(root, path, level);
+                        path->slots[level + 1] = tslot;
+                        if (node->header.nritems != 0) {
+                                tree_block_release(root, t);
+                                break;
+                        }
+                        tree_block_release(root, t);
                 }
                 if (t == root->node) {
                         /* just turn the root into a leaf and break */