static int btrfs_dev_replace_finishing(struct btrfs_fs_info *fs_info, int scrub_ret) { struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; struct btrfs_device *tgt_device; struct btrfs_device *src_device; struct btrfs_root *root = fs_info->tree_root; u8 uuid_tmp[BTRFS_UUID_SIZE]; struct btrfs_trans_handle *trans; int ret = 0; /* don't allow cancel or unmount to disturb the finishing procedure */ mutex_lock(&dev_replace->lock_finishing_cancel_unmount); btrfs_dev_replace_lock(dev_replace); /* was the operation canceled, or is it finished? */ if (dev_replace->replace_state != BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED) { btrfs_dev_replace_unlock(dev_replace); mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return 0; } tgt_device = dev_replace->tgtdev; src_device = dev_replace->srcdev; btrfs_dev_replace_unlock(dev_replace); /* * flush all outstanding I/O and inode extent mappings before the * copy operation is declared as being finished */ ret = btrfs_start_delalloc_roots(root->fs_info, 0, -1); if (ret) { mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return ret; } btrfs_wait_ordered_roots(root->fs_info, -1); trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return PTR_ERR(trans); } ret = btrfs_commit_transaction(trans, root); WARN_ON(ret); mutex_lock(&uuid_mutex); /* keep away write_all_supers() during the finishing procedure */ mutex_lock(&root->fs_info->fs_devices->device_list_mutex); mutex_lock(&root->fs_info->chunk_mutex); btrfs_dev_replace_lock(dev_replace); dev_replace->replace_state = scrub_ret ? BTRFS_IOCTL_DEV_REPLACE_STATE_CANCELED : BTRFS_IOCTL_DEV_REPLACE_STATE_FINISHED; dev_replace->tgtdev = NULL; dev_replace->srcdev = NULL; dev_replace->time_stopped = get_seconds(); dev_replace->item_needs_writeback = 1; /* replace old device with new one in mapping tree */ if (!scrub_ret) { btrfs_dev_replace_update_device_in_mapping_tree(fs_info, src_device, tgt_device); } else { printk_in_rcu(KERN_ERR "BTRFS: btrfs_scrub_dev(%s, %llu, %s) failed %d\n", src_device->missing ? "<missing disk>" : rcu_str_deref(src_device->name), src_device->devid, rcu_str_deref(tgt_device->name), scrub_ret); btrfs_dev_replace_unlock(dev_replace); mutex_unlock(&root->fs_info->chunk_mutex); mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); mutex_unlock(&uuid_mutex); if (tgt_device) btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return scrub_ret; } printk_in_rcu(KERN_INFO "BTRFS: dev_replace from %s (devid %llu) to %s finished\n", src_device->missing ? "<missing disk>" : rcu_str_deref(src_device->name), src_device->devid, rcu_str_deref(tgt_device->name)); tgt_device->is_tgtdev_for_dev_replace = 0; tgt_device->devid = src_device->devid; src_device->devid = BTRFS_DEV_REPLACE_DEVID; memcpy(uuid_tmp, tgt_device->uuid, sizeof(uuid_tmp)); memcpy(tgt_device->uuid, src_device->uuid, sizeof(tgt_device->uuid)); memcpy(src_device->uuid, uuid_tmp, sizeof(src_device->uuid)); btrfs_device_set_total_bytes(tgt_device, src_device->total_bytes); btrfs_device_set_disk_total_bytes(tgt_device, src_device->disk_total_bytes); btrfs_device_set_bytes_used(tgt_device, src_device->bytes_used); ASSERT(list_empty(&src_device->resized_list)); tgt_device->commit_total_bytes = src_device->commit_total_bytes; tgt_device->commit_bytes_used = src_device->bytes_used; if (fs_info->sb->s_bdev == src_device->bdev) fs_info->sb->s_bdev = tgt_device->bdev; if (fs_info->fs_devices->latest_bdev == src_device->bdev) fs_info->fs_devices->latest_bdev = tgt_device->bdev; list_add(&tgt_device->dev_alloc_list, &fs_info->fs_devices->alloc_list); fs_info->fs_devices->rw_devices++; btrfs_dev_replace_unlock(dev_replace); btrfs_rm_dev_replace_blocked(fs_info); btrfs_rm_dev_replace_remove_srcdev(fs_info, src_device); btrfs_rm_dev_replace_unblocked(fs_info); /* * this is again a consistent state where no dev_replace procedure * is running, the target device is part of the filesystem, the * source device is not part of the filesystem anymore and its 1st * superblock is scratched out so that it is no longer marked to * belong to this filesystem. */ mutex_unlock(&root->fs_info->chunk_mutex); mutex_unlock(&root->fs_info->fs_devices->device_list_mutex); mutex_unlock(&uuid_mutex); /* replace the sysfs entry */ btrfs_kobj_rm_device(fs_info, src_device); btrfs_kobj_add_device(fs_info, tgt_device); btrfs_rm_dev_replace_free_srcdev(fs_info, src_device); /* write back the superblocks */ trans = btrfs_start_transaction(root, 0); if (!IS_ERR(trans)) btrfs_commit_transaction(trans, root); mutex_unlock(&dev_replace->lock_finishing_cancel_unmount); return 0; }
int btrfs_dev_replace_start(struct btrfs_root *root, struct btrfs_ioctl_dev_replace_args *args) { struct btrfs_trans_handle *trans; struct btrfs_fs_info *fs_info = root->fs_info; struct btrfs_dev_replace *dev_replace = &fs_info->dev_replace; int ret; struct btrfs_device *tgt_device = NULL; struct btrfs_device *src_device = NULL; switch (args->start.cont_reading_from_srcdev_mode) { case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_ALWAYS: case BTRFS_IOCTL_DEV_REPLACE_CONT_READING_FROM_SRCDEV_MODE_AVOID: break; default: return -EINVAL; } if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') || args->start.tgtdev_name[0] == '\0') return -EINVAL; /* * Here we commit the transaction to make sure commit_total_bytes * of all the devices are updated. */ trans = btrfs_attach_transaction(root); if (!IS_ERR(trans)) { ret = btrfs_commit_transaction(trans, root); if (ret) return ret; } else if (PTR_ERR(trans) != -ENOENT) { return PTR_ERR(trans); } /* the disk copy procedure reuses the scrub code */ mutex_lock(&fs_info->volume_mutex); ret = btrfs_dev_replace_find_srcdev(root, args->start.srcdevid, args->start.srcdev_name, &src_device); if (ret) { mutex_unlock(&fs_info->volume_mutex); return ret; } ret = btrfs_init_dev_replace_tgtdev(root, args->start.tgtdev_name, src_device, &tgt_device); mutex_unlock(&fs_info->volume_mutex); if (ret) return ret; btrfs_dev_replace_lock(dev_replace); 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: break; case BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED: case BTRFS_IOCTL_DEV_REPLACE_STATE_SUSPENDED: args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_ALREADY_STARTED; goto leave; } dev_replace->cont_reading_from_srcdev_mode = args->start.cont_reading_from_srcdev_mode; WARN_ON(!src_device); dev_replace->srcdev = src_device; WARN_ON(!tgt_device); dev_replace->tgtdev = tgt_device; ret = btrfs_kobj_add_device(tgt_device->fs_devices, tgt_device); if (ret) btrfs_err(root->fs_info, "kobj add dev failed %d\n", ret); printk_in_rcu(KERN_INFO "BTRFS: dev_replace from %s (devid %llu) to %s started\n", src_device->missing ? "<missing disk>" : rcu_str_deref(src_device->name), src_device->devid, rcu_str_deref(tgt_device->name)); /* * from now on, the writes to the srcdev are all duplicated to * go to the tgtdev as well (refer to btrfs_map_block()). */ dev_replace->replace_state = BTRFS_IOCTL_DEV_REPLACE_STATE_STARTED; dev_replace->time_started = get_seconds(); 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->is_valid = 1; dev_replace->item_needs_writeback = 1; args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_NO_ERROR; btrfs_dev_replace_unlock(dev_replace); btrfs_wait_ordered_roots(root->fs_info, -1); /* force writing the updated state information to disk */ trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { ret = PTR_ERR(trans); btrfs_dev_replace_lock(dev_replace); goto leave; } ret = btrfs_commit_transaction(trans, root); WARN_ON(ret); /* the disk copy procedure reuses the scrub code */ ret = btrfs_scrub_dev(fs_info, src_device->devid, 0, btrfs_device_get_total_bytes(src_device), &dev_replace->scrub_progress, 0, 1); ret = btrfs_dev_replace_finishing(root->fs_info, ret); /* don't warn if EINPROGRESS, someone else might be running scrub */ if (ret == -EINPROGRESS) { args->result = BTRFS_IOCTL_DEV_REPLACE_RESULT_SCRUB_INPROGRESS; ret = 0; } else { WARN_ON(ret); } return ret; leave: dev_replace->srcdev = NULL; dev_replace->tgtdev = NULL; btrfs_dev_replace_unlock(dev_replace); btrfs_destroy_dev_replace_tgtdev(fs_info, tgt_device); return ret; }