From patchwork Wed Nov 29 09:15:59 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Qu Wenruo X-Patchwork-Id: 10081663 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id F07F760353 for ; Wed, 29 Nov 2017 09:16:59 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id F0C4129739 for ; Wed, 29 Nov 2017 09:16:59 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id E5EDF2973D; Wed, 29 Nov 2017 09:16:59 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7F79429739 for ; Wed, 29 Nov 2017 09:16:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753860AbdK2JQp (ORCPT ); Wed, 29 Nov 2017 04:16:45 -0500 Received: from victor.provo.novell.com ([137.65.250.26]:55493 "EHLO prv3-mh.provo.novell.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753778AbdK2JQT (ORCPT ); Wed, 29 Nov 2017 04:16:19 -0500 Received: from adam-pc.lan (prv-ext-foundry1int.gns.novell.com [137.65.251.240]) by prv3-mh.provo.novell.com with ESMTP (NOT encrypted); Wed, 29 Nov 2017 02:16:13 -0700 From: Qu Wenruo To: linux-btrfs@vger.kernel.org Cc: dsterba@suse.cz Subject: [PATCH 4/9] btrfs-progs: mkfs/rootdir: Shrink fs for rootdir option Date: Wed, 29 Nov 2017 17:15:59 +0800 Message-Id: <20171129091604.2194-5-wqu@suse.com> X-Mailer: git-send-email 2.15.0 In-Reply-To: <20171129091604.2194-1-wqu@suse.com> References: <20171129091604.2194-1-wqu@suse.com> Sender: linux-btrfs-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Use the new dev extent based shrink method for rootdir option. Signed-off-by: Qu Wenruo --- mkfs/main.c | 5 +++ mkfs/rootdir.c | 111 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ mkfs/rootdir.h | 1 + 3 files changed, 117 insertions(+) diff --git a/mkfs/main.c b/mkfs/main.c index eb49182ebe81..eb3e5bb1f92e 100644 --- a/mkfs/main.c +++ b/mkfs/main.c @@ -1256,6 +1256,11 @@ raid_groups: goto out; } } + ret = btrfs_mkfs_shrink_fs(fs_info, NULL); + if (ret < 0) { + error("error while shrinking filesystem: %d", ret); + goto out; + } } if (verbose) { diff --git a/mkfs/rootdir.c b/mkfs/rootdir.c index f8cff44d06eb..271167fe0c02 100644 --- a/mkfs/rootdir.c +++ b/mkfs/rootdir.c @@ -822,3 +822,114 @@ out: return ret; } + +/* + * Set device size to @new_size. + * + * Only used for --rootdir option. + * We will need to reset the following values: + * 1) dev item in chunk tree + * 2) super->dev_item + * 3) super->total_bytes + */ +static int set_device_size(struct btrfs_fs_info *fs_info, + struct btrfs_device *device, u64 new_size) +{ + struct btrfs_root *chunk_root = fs_info->chunk_root; + struct btrfs_trans_handle *trans; + struct btrfs_dev_item *di; + struct btrfs_path path; + struct btrfs_key key; + int ret; + + /* + * Update in-meory device->total_bytes, so that at trans commit time, + * it super->dev_item will also get updated + */ + device->total_bytes = new_size; + btrfs_init_path(&path); + + /* Update device item in chunk tree */ + trans = btrfs_start_transaction(chunk_root, 1); + if (IS_ERR(trans)) { + ret = PTR_ERR(trans); + error("failed to start transaction: %d (%s)", ret, + strerror(-ret)); + return ret; + } + key.objectid = BTRFS_DEV_ITEMS_OBJECTID; + key.type = BTRFS_DEV_ITEM_KEY; + key.offset = device->devid; + + ret = btrfs_search_slot(trans, chunk_root, &key, &path, 0, 1); + if (ret < 0) + goto err; + if (ret > 0) + ret = -ENOENT; + di = btrfs_item_ptr(path.nodes[0], path.slots[0], + struct btrfs_dev_item); + btrfs_set_device_total_bytes(path.nodes[0], di, new_size); + btrfs_mark_buffer_dirty(path.nodes[0]); + + /* + * Update super->total_bytes, since it's only used for --rootdir, + * there is only one device, just use the @new_size. + */ + btrfs_set_super_total_bytes(fs_info->super_copy, new_size); + + /* + * Commit transaction to reflect the updated super->total_bytes and + * super->dev_item + */ + ret = btrfs_commit_transaction(trans, chunk_root); + if (ret < 0) + error("failed to commit current transaction: %d (%s)", + ret, strerror(-ret)); + btrfs_release_path(&path); + return ret; + +err: + btrfs_release_path(&path); + /* + * Commit trans here won't cause problem since the fs still has + * bad magic, and something wrong already happened, we don't + * care the return value anyway. + */ + btrfs_commit_transaction(trans, chunk_root); + return ret; +} + +int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret) +{ + u64 new_size; + struct btrfs_device *device; + struct list_head *cur; + int nr_devs = 0; + int ret; + + list_for_each(cur, &fs_info->fs_devices->devices) + nr_devs++; + + if (nr_devs > 1) { + error("cannot shrink fs with more than 1 device"); + return -ENOTTY; + } + + ret = get_device_extent_end(fs_info, 1, &new_size); + if (ret < 0) { + error("failed to get minimal device size: %d (%s)", + ret, strerror(-ret)); + return ret; + } + + BUG_ON(!IS_ALIGNED(new_size, fs_info->sectorsize)); + + device = list_entry(fs_info->fs_devices->devices.next, + struct btrfs_device, dev_list); + ret = set_device_size(fs_info, device, new_size); + if (ret < 0) + return ret; + if (new_size_ret) + *new_size_ret = new_size; + return ret; +} diff --git a/mkfs/rootdir.h b/mkfs/rootdir.h index ada50ccb6ac4..91bebc507f02 100644 --- a/mkfs/rootdir.h +++ b/mkfs/rootdir.h @@ -32,4 +32,5 @@ int btrfs_mkfs_fill_dir(const char *source_dir, struct btrfs_root *root, bool verbose); u64 btrfs_mkfs_size_dir(const char *dir_name, u32 sectorsize, u64 min_dev_size, u64 meta_profile, u64 data_profile); +int btrfs_mkfs_shrink_fs(struct btrfs_fs_info *fs_info, u64 *new_size_ret); #endif