/* drop the root item for 'key' from 'root' */ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_key *key) { struct btrfs_path *path; int ret; u32 refs; struct btrfs_root_item *ri; struct extent_buffer *leaf; path = btrfs_alloc_path(); BUG_ON(!path); ret = btrfs_search_slot(trans, root, key, path, -1, 1); if (ret < 0) goto out; BUG_ON(ret != 0); leaf = path->nodes[0]; ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item); refs = btrfs_disk_root_refs(leaf, ri); BUG_ON(refs != 0); ret = btrfs_del_item(trans, root, path); out: btrfs_free_path(path); return ret; }
int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, struct btrfs_key *key) { struct btrfs_path *path; int ret; u32 refs; struct btrfs_root_item *ri; struct extent_buffer *leaf; path = btrfs_alloc_path(); BUG_ON(!path); ret = btrfs_search_slot(trans, root, key, path, -1, 1); if (ret < 0) goto out; if (ret) { btrfs_print_leaf(root, path->nodes[0]); printk("failed to del %llu %u %llu\n", (unsigned long long)key->objectid, key->type, (unsigned long long)key->offset); } BUG_ON(ret != 0); leaf = path->nodes[0]; ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item); refs = btrfs_disk_root_refs(leaf, ri); BUG_ON(refs != 0); ret = btrfs_del_item(trans, root, path); out: btrfs_release_path(root, path); btrfs_free_path(path); return ret; }
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) { int i; u32 type; u32 nr = btrfs_header_nritems(l); struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_dir_item *di; struct btrfs_inode_item *ii; struct btrfs_block_group_item *bi; struct btrfs_file_extent_item *fi; struct btrfs_extent_data_ref *dref; struct btrfs_shared_data_ref *sref; struct btrfs_dev_extent *dev_extent; struct btrfs_key key; struct btrfs_key found_key; printk(KERN_INFO "leaf %llu total ptrs %d free space %d\n", (unsigned long long)btrfs_header_bytenr(l), nr, btrfs_leaf_free_space(root, l)); for (i = 0 ; i < nr ; i++) { item = btrfs_item_nr(l, i); btrfs_item_key_to_cpu(l, &key, i); type = btrfs_key_type(&key); printk(KERN_INFO "\titem %d key (%llu %x %llu) itemoff %d " "itemsize %d\n", i, (unsigned long long)key.objectid, type, (unsigned long long)key.offset, btrfs_item_offset(l, item), btrfs_item_size(l, item)); switch (type) { case BTRFS_INODE_ITEM_KEY: ii = btrfs_item_ptr(l, i, struct btrfs_inode_item); printk(KERN_INFO "\t\tinode generation %llu size %llu " "mode %o\n", (unsigned long long) btrfs_inode_generation(l, ii), (unsigned long long)btrfs_inode_size(l, ii), btrfs_inode_mode(l, ii)); break; case BTRFS_DIR_ITEM_KEY: di = btrfs_item_ptr(l, i, struct btrfs_dir_item); btrfs_dir_item_key_to_cpu(l, di, &found_key); printk(KERN_INFO "\t\tdir oid %llu type %u\n", (unsigned long long)found_key.objectid, btrfs_dir_type(l, di)); break; case BTRFS_ROOT_ITEM_KEY: ri = btrfs_item_ptr(l, i, struct btrfs_root_item); printk(KERN_INFO "\t\troot data bytenr %llu refs %u\n", (unsigned long long) btrfs_disk_root_bytenr(l, ri), btrfs_disk_root_refs(l, ri)); break; case BTRFS_EXTENT_ITEM_KEY: print_extent_item(l, i); break; case BTRFS_TREE_BLOCK_REF_KEY: printk(KERN_INFO "\t\ttree block backref\n"); break; case BTRFS_SHARED_BLOCK_REF_KEY: printk(KERN_INFO "\t\tshared block backref\n"); break; case BTRFS_EXTENT_DATA_REF_KEY: dref = btrfs_item_ptr(l, i, struct btrfs_extent_data_ref); print_extent_data_ref(l, dref); break; case BTRFS_SHARED_DATA_REF_KEY: sref = btrfs_item_ptr(l, i, struct btrfs_shared_data_ref); printk(KERN_INFO "\t\tshared data backref count %u\n", btrfs_shared_data_ref_count(l, sref)); break; case BTRFS_EXTENT_DATA_KEY: fi = btrfs_item_ptr(l, i, struct btrfs_file_extent_item); if (btrfs_file_extent_type(l, fi) == BTRFS_FILE_EXTENT_INLINE) { printk(KERN_INFO "\t\tinline extent data " "size %u\n", btrfs_file_extent_inline_len(l, fi)); break; } printk(KERN_INFO "\t\textent data disk bytenr %llu " "nr %llu\n", (unsigned long long) btrfs_file_extent_disk_bytenr(l, fi), (unsigned long long) btrfs_file_extent_disk_num_bytes(l, fi)); printk(KERN_INFO "\t\textent data offset %llu " "nr %llu ram %llu\n", (unsigned long long) btrfs_file_extent_offset(l, fi), (unsigned long long) btrfs_file_extent_num_bytes(l, fi), (unsigned long long) btrfs_file_extent_ram_bytes(l, fi)); break; case BTRFS_EXTENT_REF_V0_KEY: #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 print_extent_ref_v0(l, i); #else BUG(); #endif break; case BTRFS_BLOCK_GROUP_ITEM_KEY: bi = btrfs_item_ptr(l, i, struct btrfs_block_group_item); printk(KERN_INFO "\t\tblock group used %llu\n", (unsigned long long) btrfs_disk_block_group_used(l, bi)); break; case BTRFS_CHUNK_ITEM_KEY: print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk)); break; case BTRFS_DEV_ITEM_KEY: print_dev_item(l, btrfs_item_ptr(l, i, struct btrfs_dev_item)); break; case BTRFS_DEV_EXTENT_KEY: dev_extent = btrfs_item_ptr(l, i, struct btrfs_dev_extent); printk(KERN_INFO "\t\tdev extent chunk_tree %llu\n" "\t\tchunk objectid %llu chunk offset %llu " "length %llu\n", (unsigned long long) btrfs_dev_extent_chunk_tree(l, dev_extent), (unsigned long long) btrfs_dev_extent_chunk_objectid(l, dev_extent), (unsigned long long) btrfs_dev_extent_chunk_offset(l, dev_extent), (unsigned long long) btrfs_dev_extent_length(l, dev_extent)); }; } }
/* * at mount time we want to find all the old transaction snapshots that were in * the process of being deleted if we crashed. This is any root item with an * offset lower than the latest root. They need to be queued for deletion to * finish what was happening when we crashed. */ int btrfs_find_dead_roots(struct btrfs_root *root, u64 objectid) { struct btrfs_root *dead_root; struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_key key; struct btrfs_key found_key; struct btrfs_path *path; int ret; u32 nritems; struct extent_buffer *leaf; int slot; key.objectid = objectid; btrfs_set_key_type(&key, BTRFS_ROOT_ITEM_KEY); key.offset = 0; path = btrfs_alloc_path(); if (!path) return -ENOMEM; again: ret = btrfs_search_slot(NULL, root, &key, path, 0, 0); if (ret < 0) goto err; while (1) { leaf = path->nodes[0]; nritems = btrfs_header_nritems(leaf); slot = path->slots[0]; if (slot >= nritems) { ret = btrfs_next_leaf(root, path); if (ret) break; leaf = path->nodes[0]; nritems = btrfs_header_nritems(leaf); slot = path->slots[0]; } item = btrfs_item_nr(leaf, slot); btrfs_item_key_to_cpu(leaf, &key, slot); if (btrfs_key_type(&key) != BTRFS_ROOT_ITEM_KEY) goto next; if (key.objectid < objectid) goto next; if (key.objectid > objectid) break; ri = btrfs_item_ptr(leaf, slot, struct btrfs_root_item); if (btrfs_disk_root_refs(leaf, ri) != 0) goto next; memcpy(&found_key, &key, sizeof(key)); key.offset++; btrfs_release_path(root, path); dead_root = btrfs_read_fs_root_no_radix(root->fs_info->tree_root, &found_key); if (IS_ERR(dead_root)) { ret = PTR_ERR(dead_root); goto err; } ret = btrfs_add_dead_root(dead_root); if (ret) goto err; goto again; next: slot++; path->slots[0]++; } ret = 0; err: btrfs_free_path(path); return ret; }
void btrfs_print_leaf(struct btrfs_root *root, struct extent_buffer *l) { int i; u32 type, nr; struct btrfs_item *item; struct btrfs_root_item *ri; struct btrfs_dir_item *di; struct btrfs_inode_item *ii; struct btrfs_block_group_item *bi; struct btrfs_file_extent_item *fi; struct btrfs_extent_data_ref *dref; struct btrfs_shared_data_ref *sref; struct btrfs_dev_extent *dev_extent; struct btrfs_key key; struct btrfs_key found_key; if (!l) return; nr = btrfs_header_nritems(l); btrfs_info(root->fs_info, "leaf %llu total ptrs %d free space %d", btrfs_header_bytenr(l), nr, btrfs_leaf_free_space(root, l)); for (i = 0 ; i < nr ; i++) { item = btrfs_item_nr(i); btrfs_item_key_to_cpu(l, &key, i); type = key.type; printk(KERN_INFO "\titem %d key (%llu %u %llu) itemoff %d " "itemsize %d\n", i, key.objectid, type, key.offset, btrfs_item_offset(l, item), btrfs_item_size(l, item)); switch (type) { case BTRFS_INODE_ITEM_KEY: ii = btrfs_item_ptr(l, i, struct btrfs_inode_item); printk(KERN_INFO "\t\tinode generation %llu size %llu " "mode %o\n", btrfs_inode_generation(l, ii), btrfs_inode_size(l, ii), btrfs_inode_mode(l, ii)); break; case BTRFS_DIR_ITEM_KEY: di = btrfs_item_ptr(l, i, struct btrfs_dir_item); btrfs_dir_item_key_to_cpu(l, di, &found_key); printk(KERN_INFO "\t\tdir oid %llu type %u\n", found_key.objectid, btrfs_dir_type(l, di)); break; case BTRFS_ROOT_ITEM_KEY: ri = btrfs_item_ptr(l, i, struct btrfs_root_item); printk(KERN_INFO "\t\troot data bytenr %llu refs %u\n", btrfs_disk_root_bytenr(l, ri), btrfs_disk_root_refs(l, ri)); break; case BTRFS_EXTENT_ITEM_KEY: case BTRFS_METADATA_ITEM_KEY: print_extent_item(l, i, type); break; case BTRFS_TREE_BLOCK_REF_KEY: printk(KERN_INFO "\t\ttree block backref\n"); break; case BTRFS_SHARED_BLOCK_REF_KEY: printk(KERN_INFO "\t\tshared block backref\n"); break; case BTRFS_EXTENT_DATA_REF_KEY: dref = btrfs_item_ptr(l, i, struct btrfs_extent_data_ref); print_extent_data_ref(l, dref); break; case BTRFS_SHARED_DATA_REF_KEY: sref = btrfs_item_ptr(l, i, struct btrfs_shared_data_ref); printk(KERN_INFO "\t\tshared data backref count %u\n", btrfs_shared_data_ref_count(l, sref)); break; case BTRFS_EXTENT_DATA_KEY: fi = btrfs_item_ptr(l, i, struct btrfs_file_extent_item); if (btrfs_file_extent_type(l, fi) == BTRFS_FILE_EXTENT_INLINE) { printk(KERN_INFO "\t\tinline extent data " "size %u\n", btrfs_file_extent_inline_len(l, i, fi)); break; } printk(KERN_INFO "\t\textent data disk bytenr %llu " "nr %llu\n", btrfs_file_extent_disk_bytenr(l, fi), btrfs_file_extent_disk_num_bytes(l, fi)); printk(KERN_INFO "\t\textent data offset %llu " "nr %llu ram %llu\n", btrfs_file_extent_offset(l, fi), btrfs_file_extent_num_bytes(l, fi), btrfs_file_extent_ram_bytes(l, fi)); break; case BTRFS_EXTENT_REF_V0_KEY: #ifdef BTRFS_COMPAT_EXTENT_TREE_V0 print_extent_ref_v0(l, i); #else BUG(); #endif break; case BTRFS_BLOCK_GROUP_ITEM_KEY: bi = btrfs_item_ptr(l, i, struct btrfs_block_group_item); printk(KERN_INFO "\t\tblock group used %llu\n", btrfs_disk_block_group_used(l, bi)); break; case BTRFS_CHUNK_ITEM_KEY: print_chunk(l, btrfs_item_ptr(l, i, struct btrfs_chunk)); break; case BTRFS_DEV_ITEM_KEY: print_dev_item(l, btrfs_item_ptr(l, i, struct btrfs_dev_item)); break; case BTRFS_DEV_EXTENT_KEY: dev_extent = btrfs_item_ptr(l, i, struct btrfs_dev_extent); printk(KERN_INFO "\t\tdev extent chunk_tree %llu\n" "\t\tchunk objectid %llu chunk offset %llu " "length %llu\n", btrfs_dev_extent_chunk_tree(l, dev_extent), btrfs_dev_extent_chunk_objectid(l, dev_extent), btrfs_dev_extent_chunk_offset(l, dev_extent), btrfs_dev_extent_length(l, dev_extent)); break; case BTRFS_PERSISTENT_ITEM_KEY: printk(KERN_INFO "\t\tpersistent item objectid %llu offset %llu\n", key.objectid, key.offset); switch (key.objectid) { case BTRFS_DEV_STATS_OBJECTID: printk(KERN_INFO "\t\tdevice stats\n"); break; default: printk(KERN_INFO "\t\tunknown persistent item\n"); } break; case BTRFS_TEMPORARY_ITEM_KEY: printk(KERN_INFO "\t\ttemporary item objectid %llu offset %llu\n", key.objectid, key.offset); switch (key.objectid) { case BTRFS_BALANCE_OBJECTID: printk(KERN_INFO "\t\tbalance status\n"); break; default: printk(KERN_INFO "\t\tunknown temporary item\n"); } break; case BTRFS_DEV_REPLACE_KEY: printk(KERN_INFO "\t\tdev replace\n"); break; case BTRFS_UUID_KEY_SUBVOL: case BTRFS_UUID_KEY_RECEIVED_SUBVOL: print_uuid_item(l, btrfs_item_ptr_offset(l, i), btrfs_item_size_nr(l, i)); break; }; } }