/* * insert a defrag record for this inode if auto defrag is * enabled */ int btrfs_add_inode_defrag(struct btrfs_trans_handle *trans, struct inode *inode) { struct btrfs_root *root = BTRFS_I(inode)->root; struct inode_defrag *defrag; u64 transid; if (!btrfs_test_opt(root, AUTO_DEFRAG)) return 0; if (btrfs_fs_closing(root->fs_info)) return 0; if (test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) return 0; if (trans) transid = trans->transid; else transid = BTRFS_I(inode)->root->last_trans; defrag = kzalloc(sizeof(*defrag), GFP_NOFS); if (!defrag) return -ENOMEM; defrag->ino = btrfs_ino(inode); defrag->transid = transid; defrag->root = root->root_key.objectid; spin_lock(&root->fs_info->defrag_inodes_lock); if (!test_bit(BTRFS_INODE_IN_DEFRAG, &BTRFS_I(inode)->runtime_flags)) __btrfs_add_inode_defrag(inode, defrag); else kfree(defrag); spin_unlock(&root->fs_info->defrag_inodes_lock); return 0; }
int btrfs_init_dev_replace(struct btrfs_fs_info *fs_info) { struct btrfs_key key; struct btrfs_root *dev_root = fs_info->dev_root; struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; struct extent_buffer *eb; int slot; int ret = 0; struct btrfs_path *path = NULL; int item_size; struct btrfs_dev_replace_item *ptr; u64 src_devid; path = btrfs_alloc_path(); if (!path) { ret = -ENOMEM; goto out; } key.objectid = 0; key.type = BTRFS_DEV_REPLACE_KEY; key.offset = 0; ret = btrfs_search_slot(NULL, dev_root, &key, path, 0, 0); if (ret) { no_valid_dev_replace_entry_found: ret = 0; dev_replace->replace_state = BTRFS_DEV_REPLACE_ITEM_STATE_NEVER_STARTED; dev_replace->cont_reading_from_srcdev_mode = BTRFS_DEV_REPLACE_ITEM_CONT_READING_FROM_SRCDEV_MODE_ALWAYS; dev_replace->replace_state = 0; dev_replace->time_started = 0; dev_replace->time_stopped = 0; atomic64_set(&dev_replace->num_write_errors, 0); atomic64_set(&dev_replace->num_uncorrectable_read_errors, 0); dev_replace->cursor_left = 0; dev_replace->committed_cursor_left = 0; dev_replace->cursor_left_last_write_of_item = 0; dev_replace->cursor_right = 0; dev_replace->srcdev = NULL; dev_replace->tgtdev = NULL; dev_replace->is_valid = 0; dev_replace->item_needs_writeback = 0; goto out; } slot = path->slots[0]; eb = path->nodes[0]; item_size = btrfs_item_size_nr(eb, slot); ptr = btrfs_item_ptr(eb, slot, struct btrfs_dev_replace_item); if (item_size != sizeof(struct btrfs_dev_replace_item)) { pr_warn("btrfs: dev_replace entry found has unexpected size, ignore entry\n"); goto no_valid_dev_replace_entry_found; } src_devid = btrfs_dev_replace_src_devid(eb, ptr); dev_replace->cont_reading_from_srcdev_mode = btrfs_dev_replace_cont_reading_from_srcdev_mode(eb, ptr); dev_replace->replace_state = btrfs_dev_replace_replace_state(eb, ptr); dev_replace->time_started = btrfs_dev_replace_time_started(eb, ptr); dev_replace->time_stopped = btrfs_dev_replace_time_stopped(eb, ptr); atomic64_set(&dev_replace->num_write_errors, btrfs_dev_replace_num_write_errors(eb, ptr)); atomic64_set(&dev_replace->num_uncorrectable_read_errors, btrfs_dev_replace_num_uncorrectable_read_errors(eb, ptr)); dev_replace->cursor_left = btrfs_dev_replace_cursor_left(eb, ptr); dev_replace->committed_cursor_left = dev_replace->cursor_left; dev_replace->cursor_left_last_write_of_item = dev_replace->cursor_left; dev_replace->cursor_right = btrfs_dev_replace_cursor_right(eb, ptr); dev_replace->is_valid = 1; dev_replace->item_needs_writeback = 0; switch (dev_replace->replace_state) { case BTRFS_IOCTL_DEV_REPLACE_STATE_NEVER_STARTED: case BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED: case BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED: dev_replace->srcdev = NULL; dev_replace->tgtdev = NULL; break; case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: dev_replace->srcdev = btrfs_find_device(fs_info, src_devid, NULL, NULL); dev_replace->tgtdev = btrfs_find_device(fs_info, BTRFS_DEV_REPLACE_DEVID, NULL, NULL); /* * allow 'btrfs dev replace_cancel' if src/tgt device is * missing */ if (!dev_replace->srcdev && !btrfs_test_opt(dev_root, DEGRADED)) { ret = -EIO; pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "srcdev (devid %llu) is missing, need to run 'btrfs dev scan'?\n", (unsigned long long)src_devid); } if (!dev_replace->tgtdev && !btrfs_test_opt(dev_root, DEGRADED)) { ret = -EIO; pr_warn("btrfs: cannot mount because device replace operation is ongoing and\n" "tgtdev (devid %llu) is missing, need to run btrfs dev scan?\n", (unsigned long long)BTRFS_DEV_REPLACE_DEVID); } if (dev_replace->tgtdev) { if (dev_replace->srcdev) { dev_replace->tgtdev->total_bytes = dev_replace->srcdev->total_bytes; dev_replace->tgtdev->disk_total_bytes = dev_replace->srcdev->disk_total_bytes; dev_replace->tgtdev->bytes_used = dev_replace->srcdev->bytes_used; } dev_replace->tgtdev->is_tgtdev_for_dev_replace = 1; btrfs_init_dev_replace_tgtdev_for_resume(fs_info, dev_replace->tgtdev); } break; } out: if (path) btrfs_free_path(path); return ret; }
int btrfs_defrag_leaves(struct btrfs_trans_handle *trans, struct btrfs_root *root, int cache_only) { struct btrfs_path *path = NULL; struct btrfs_key key; int ret = 0; int wret; int level; int is_extent = 0; int next_key_ret = 0; u64 last_ret = 0; u64 min_trans = 0; if (cache_only) goto out; if (root->fs_info->extent_root == root) { /* * there's recursion here right now in the tree locking, * we can't defrag the extent root without deadlock */ goto out; } if (root->ref_cows == 0 && !is_extent) goto out; if (btrfs_test_opt(root, SSD)) goto out; path = btrfs_alloc_path(); if (!path) return -ENOMEM; level = btrfs_header_level(root->node); if (level == 0) goto out; if (root->defrag_progress.objectid == 0) { struct extent_buffer *root_node; u32 nritems; root_node = btrfs_lock_root_node(root); btrfs_set_lock_blocking(root_node); nritems = btrfs_header_nritems(root_node); root->defrag_max.objectid = 0; /* from above we know this is not a leaf */ btrfs_node_key_to_cpu(root_node, &root->defrag_max, nritems - 1); btrfs_tree_unlock(root_node); free_extent_buffer(root_node); memset(&key, 0, sizeof(key)); } else { memcpy(&key, &root->defrag_progress, sizeof(key)); } path->keep_locks = 1; if (cache_only) min_trans = root->defrag_trans_start; ret = btrfs_search_forward(root, &key, NULL, path, cache_only, min_trans); if (ret < 0) goto out; if (ret > 0) { ret = 0; goto out; } btrfs_release_path(path); wret = btrfs_search_slot(trans, root, &key, path, 0, 1); if (wret < 0) { ret = wret; goto out; } if (!path->nodes[1]) { ret = 0; goto out; } path->slots[1] = btrfs_header_nritems(path->nodes[1]); next_key_ret = btrfs_find_next_key(root, path, &key, 1, cache_only, min_trans); ret = btrfs_realloc_node(trans, root, path->nodes[1], 0, cache_only, &last_ret, &root->defrag_progress); if (ret) { WARN_ON(ret == -EAGAIN); goto out; } if (next_key_ret == 0) { memcpy(&root->defrag_progress, &key, sizeof(key)); ret = -EAGAIN; } out: if (path) btrfs_free_path(path); if (ret == -EAGAIN) { if (root->defrag_max.objectid > root->defrag_progress.objectid) goto done; if (root->defrag_max.type > root->defrag_progress.type) goto done; if (root->defrag_max.offset > root->defrag_progress.offset) goto done; ret = 0; } done: if (ret != -EAGAIN) { memset(&root->defrag_progress, 0, sizeof(root->defrag_progress)); root->defrag_trans_start = trans->transid; } return ret; }