From patchwork Mon Sep 17 07:28:51 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Su Yue X-Patchwork-Id: 10602129 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4344F17E0 for ; Mon, 17 Sep 2018 07:22:14 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 2712F29605 for ; Mon, 17 Sep 2018 07:22:14 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 1B9E929608; Mon, 17 Sep 2018 07:22:14 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, 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 91B9629609 for ; Mon, 17 Sep 2018 07:22:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728324AbeIQMsT (ORCPT ); Mon, 17 Sep 2018 08:48:19 -0400 Received: from mail.cn.fujitsu.com ([183.91.158.132]:52508 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727690AbeIQMsS (ORCPT ); Mon, 17 Sep 2018 08:48:18 -0400 X-IronPort-AV: E=Sophos;i="5.43,368,1503331200"; d="scan'208";a="44983915" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 17 Sep 2018 15:22:06 +0800 Received: from G08CNEXCHPEKD03.g08.fujitsu.local (unknown [10.167.33.85]) by cn.fujitsu.com (Postfix) with ESMTP id 0A2304B6EC99 for ; Mon, 17 Sep 2018 15:22:03 +0800 (CST) Received: from archlinux.g08.fujitsu.local (10.167.226.31) by G08CNEXCHPEKD03.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.408.0; Mon, 17 Sep 2018 15:22:05 +0800 From: Su Yue To: CC: Subject: [PATCH v3 6/7] btrfs-progs: lowmem: optimization and repair for check_inode_extref() Date: Mon, 17 Sep 2018 15:28:51 +0800 Message-ID: <20180917072852.25831-7-suy.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180917072852.25831-1-suy.fnst@cn.fujitsu.com> References: <20180917072852.25831-1-suy.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.31] X-yoursite-MailScanner-ID: 0A2304B6EC99.A9E07 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: suy.fnst@cn.fujitsu.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 inode_extref is much similar with inode_ref, most codes are reused in check_inode_extref(). Exceptions: There is no need to check root directory, so remove it. Make check_inode_extref() verify hash value with key offset now. And lowmem check can detect errors about inode_extref and try to repair errors. Signed-off-by: Su Yue Reviewed-by: Qu Wenruo --- check/mode-lowmem.c | 125 +++++++++++++++++++++++++++++++++++--------- 1 file changed, 99 insertions(+), 26 deletions(-) diff --git a/check/mode-lowmem.c b/check/mode-lowmem.c index 612e5e28e45b..53e4fdccd740 100644 --- a/check/mode-lowmem.c +++ b/check/mode-lowmem.c @@ -1182,37 +1182,86 @@ out: * * Return 0 if no error occurred. */ -static int check_inode_extref(struct btrfs_root *root, - struct btrfs_key *ref_key, - struct extent_buffer *node, int slot, u64 *refs, - int mode) +static int check_inode_extref(struct btrfs_root *root, struct btrfs_key *ref_key, + struct btrfs_path *path, char *name_ret, + u32 *namelen_ret, u64 *refs_ret, int mode) { struct btrfs_key key; struct btrfs_key location; struct btrfs_inode_extref *extref; + struct extent_buffer *node; char namebuf[BTRFS_NAME_LEN] = {0}; u32 total; - u32 cur = 0; + u32 cur; u32 len; u32 name_len; u64 index; u64 parent; + int err; + int tmp_err; int ret; - int err = 0; + int slot; + u64 refs; + bool search_again = false; location.objectid = ref_key->objectid; location.type = BTRFS_INODE_ITEM_KEY; location.offset = 0; +begin: + cur = 0; + err = 0; + refs = *refs_ret; + *namelen_ret = 0; + + /* since after repair, path and the dir item may be changed */ + if (search_again) { + search_again = false; + btrfs_release_path(path); + ret = btrfs_search_slot(NULL, root, ref_key, path, 0, 0); + /* + * The item was deleted, let the path point to the last checked + * item. + */ + if (ret > 0) { + if (path->slots[0] == 0) { + ret = btrfs_prev_leaf(root, path); + /* + * we are checking the inode item, there must + * be some items before, the case shall never + * happen. + */ + if (ret > 0) + ret = -EIO; + if (ret) + error( + "failed to get item before INODE_REF[%llu, %llu] root %llu: %s", + ref_key->objectid, ref_key->offset, + root->objectid, strerror(-ret)); + } else { + path->slots[0]--; + ret = 0; + } + goto out; + } else if (ret < 0) { + err |= FATAL_ERROR; + goto out; + } + } + + node = path->nodes[0]; + slot = path->slots[0]; extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref); total = btrfs_item_size_nr(node, slot); -next: - /* update inode ref count */ - (*refs)++; - name_len = btrfs_inode_extref_name_len(node, extref); - index = btrfs_inode_extref_index(node, extref); +loop: + /* Update inode ref count */ + refs++; + tmp_err = 0; parent = btrfs_inode_extref_parent(node, extref); + index = btrfs_inode_extref_index(node, extref); + name_len = btrfs_inode_extref_name_len(node, extref); + if (name_len <= BTRFS_NAME_LEN) { len = name_len; } else { @@ -1220,37 +1269,61 @@ next: warning("root %llu INODE_EXTREF[%llu %llu] name too long", root->objectid, ref_key->objectid, ref_key->offset); } + read_extent_buffer(node, namebuf, (unsigned long)(extref + 1), len); - /* Check root dir ref name */ - if (index == 0 && strncmp(namebuf, "..", name_len)) { - error("root %llu INODE_EXTREF[%llu %llu] ROOT_DIR name shouldn't be %s", + /* verify hash value */ + if (ref_key->offset != btrfs_extref_hash(parent, namebuf, len)) { + err |= FATAL_ERROR; + error("root %llu INODE_EXTREF[%llu %llu] name %s namelen %u mode %d mismatch with its hash, wanted %llu have %llu", root->objectid, ref_key->objectid, ref_key->offset, - namebuf); - err |= ROOT_DIR_ERROR; + namebuf, len, mode, ref_key->offset, + btrfs_extref_hash(parent, namebuf, len)); + goto out; + } + + /* copy the first name found to name_ret */ + if (refs == 1 && name_ret) { + memcpy(name_ret, namebuf, len); + *namelen_ret = len; } - /* find related dir_index */ + /* Find related DIR_INDEX */ key.objectid = parent; key.type = BTRFS_DIR_INDEX_KEY; key.offset = index; - ret = find_dir_item(root, &key, &location, namebuf, len, mode); - err |= ret; + tmp_err |= find_dir_item(root, &key, &location, namebuf, len, + imode_to_type(mode)); - /* find related dir_item */ + /* Find related dir_item */ key.objectid = parent; key.type = BTRFS_DIR_ITEM_KEY; key.offset = btrfs_name_hash(namebuf, len); - ret = find_dir_item(root, &key, &location, namebuf, len, mode); - err |= ret; + tmp_err |= find_dir_item(root, &key, &location, namebuf, len, + imode_to_type(mode)); + + if (tmp_err && repair) { + ret = repair_ternary_lowmem(root, parent, ref_key->objectid, + index, namebuf, name_len, imode_to_type(mode), + tmp_err); + if (!ret) { + search_again = true; + goto begin; + } + } + print_inode_ref_err(root, ref_key, index, namebuf, name_len, + imode_to_type(mode), tmp_err); + + err |= tmp_err; len = sizeof(*extref) + name_len; extref = (struct btrfs_inode_extref *)((char *)extref + len); cur += len; if (cur < total) - goto next; - + goto loop; +out: + *refs_ret = refs; return err; } @@ -2426,8 +2499,8 @@ static int check_inode_item(struct btrfs_root *root, struct btrfs_path *path) warning("root %llu EXTREF[%llu %llu] isn't supported", root->objectid, key.objectid, key.offset); - ret = check_inode_extref(root, &key, node, slot, &refs, - mode); + ret = check_inode_extref(root, &key, path, namebuf, + &name_len, &refs, mode); err |= ret; break; }