From patchwork Thu Jul 28 07:08:17 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lu Fengqi X-Patchwork-Id: 9250765 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 81C146075F for ; Thu, 28 Jul 2016 07:09:42 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 7173620246 for ; Thu, 28 Jul 2016 07:09:42 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 665CD2094D; Thu, 28 Jul 2016 07:09:42 +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 B0121205AD for ; Thu, 28 Jul 2016 07:09:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1163632AbcG1HJJ (ORCPT ); Thu, 28 Jul 2016 03:09:09 -0400 Received: from cn.fujitsu.com ([59.151.112.132]:42349 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1163330AbcG1HJB (ORCPT ); Thu, 28 Jul 2016 03:09:01 -0400 X-IronPort-AV: E=Sophos;i="5.22,518,1449504000"; d="scan'208";a="9211853" Received: from unknown (HELO cn.fujitsu.com) ([10.167.33.5]) by heian.cn.fujitsu.com with ESMTP; 28 Jul 2016 15:08:47 +0800 Received: from G08CNEXCHPEKD03.g08.fujitsu.local (unknown [10.167.33.85]) by cn.fujitsu.com (Postfix) with ESMTP id 8ED0742BA383 for ; Thu, 28 Jul 2016 15:08:47 +0800 (CST) Received: from luke.localdomain (10.167.226.118) by G08CNEXCHPEKD03.g08.fujitsu.local (10.167.33.89) with Microsoft SMTP Server (TLS) id 14.3.279.2; Thu, 28 Jul 2016 15:08:46 +0800 From: Lu Fengqi To: CC: Lu Fengqi , Qu Wenruo Subject: [PATCH 05/13] btrfs-progs: check: introduce function to find inode_ref Date: Thu, 28 Jul 2016 15:08:17 +0800 Message-ID: <1469689705-26836-6-git-send-email-lufq.fnst@cn.fujitsu.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1469689705-26836-1-git-send-email-lufq.fnst@cn.fujitsu.com> References: <1469689705-26836-1-git-send-email-lufq.fnst@cn.fujitsu.com> MIME-Version: 1.0 X-Originating-IP: [10.167.226.118] X-yoursite-MailScanner-ID: 8ED0742BA383.AEDE6 X-yoursite-MailScanner: Found to be clean X-yoursite-MailScanner-From: lufq.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 Introduce a new function find_inode_ref() to find INODE_REF/INODE_EXTREF for the given key, and check it with the specified DIR_ITEM/DIR_INDEX match. Signed-off-by: Lu Fengqi Signed-off-by: Qu Wenruo --- cmds-check.c | 152 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 152 insertions(+) diff --git a/cmds-check.c b/cmds-check.c index f9d5c8c..501c5e0 100644 --- a/cmds-check.c +++ b/cmds-check.c @@ -3882,6 +3882,7 @@ out: #define ROOT_DIR_ERROR (1<<1) /* bad root_dir */ #define DIR_ITEM_MISSING (1<<2) /* DIR_ITEM not found */ #define DIR_ITEM_MISMATCH (1<<3) /* DIR_ITEM found but not match */ +#define INODE_REF_MISSING (1<<4) /* INODE_REF/INODE_EXTREF not found */ /* * Find DIR_ITEM/DIR_INDEX for the given key and check it with the specified @@ -4172,6 +4173,157 @@ next: return err; } +/* + * Find INODE_REF/INODE_EXTREF for the given key and check it with the specified + * DIR_ITEM/DIR_INDEX match. + * + * @root: the root of the fs/file tree + * @key: the key of the INODE_REF/INODE_EXTREF + * @name: the name in the INODE_REF/INODE_EXTREF + * @namelen: the length of name in the INODE_REF/INODE_EXTREF + * @index: the index in the INODE_REF/INODE_EXTREF, for DIR_ITEM set index + * to (u64)-1 + * @ext_ref: the EXTENDED_IREF feature + * + * Return 0 if no error occurred. + * Return INODE_REF_MISSING if couldn't find related INODE_REF/INODE_EXTREF for + * specified DIR_ITEM/DIR_INDEX. + */ +static int find_inode_ref(struct btrfs_root *root, struct btrfs_key *key, + char *name, int namelen, u64 index, + unsigned int ext_ref) +{ + struct btrfs_path path; + struct btrfs_inode_ref *ref; + struct btrfs_inode_extref *extref; + struct extent_buffer *node; + char ref_namebuf[BTRFS_NAME_LEN] = {0}; + u32 total; + u32 cur = 0; + u32 len; + u32 ref_namelen; + u64 ref_index; + u64 parent; + u64 dir_id; + int slot; + int ret; + + btrfs_init_path(&path); + ret = btrfs_search_slot(NULL, root, key, &path, 0, 0); + if (ret) { + ret = INODE_REF_MISSING; + goto extref; + } + + node = path.nodes[0]; + slot = path.slots[0]; + + ref = btrfs_item_ptr(node, slot, struct btrfs_inode_ref); + total = btrfs_item_size_nr(node, slot); + + /* Iterate all entry of INODE_REF */ + while (cur < total) { + ret = INODE_REF_MISSING; + + ref_namelen = btrfs_inode_ref_name_len(node, ref); + ref_index = btrfs_inode_ref_index(node, ref); + if (index != (u64)-1 && index != ref_index) + goto next_ref; + + if (ref_namelen <= BTRFS_NAME_LEN) { + len = ref_namelen; + } else { + len = BTRFS_NAME_LEN; + fprintf(stderr, + "Warning: root %llu INODE %s[%llu %llu] name too long\n", + root->objectid, + key->type == BTRFS_INODE_REF_KEY ? + "REF" : "EXTREF", + key->objectid, key->offset); + } + read_extent_buffer(node, ref_namebuf, (unsigned long)(ref + 1), + len); + + if (len != namelen || strncmp(ref_namebuf, name, len)) + goto next_ref; + + ret = 0; + goto out; +next_ref: + len = sizeof(*ref) + ref_namelen; + ref = (struct btrfs_inode_ref *)((char *)ref + len); + cur += len; + } + +extref: + /* Skip if not support EXTENDED_IREF feature */ + if (!ext_ref) + goto out; + + btrfs_release_path(&path); + btrfs_init_path(&path); + + dir_id = key->offset; + key->type = BTRFS_INODE_EXTREF_KEY; + key->offset = btrfs_extref_hash(dir_id, name, namelen); + + ret = btrfs_search_slot(NULL, root, key, &path, 0, 0); + if (ret) { + ret = INODE_REF_MISSING; + goto out; + } + + node = path.nodes[0]; + slot = path.slots[0]; + + extref = btrfs_item_ptr(node, slot, struct btrfs_inode_extref); + cur = 0; + total = btrfs_item_size_nr(node, slot); + + /* Iterate all entry of INODE_EXTREF */ + while (cur < total) { + ret = INODE_REF_MISSING; + + ref_namelen = btrfs_inode_extref_name_len(node, extref); + ref_index = btrfs_inode_extref_index(node, extref); + parent = btrfs_inode_extref_parent(node, extref); + if (index != (u64)-1 && index != ref_index) + goto next_extref; + + if (parent != dir_id) + goto next_extref; + + if (ref_namelen <= BTRFS_NAME_LEN) { + len = ref_namelen; + } else { + len = BTRFS_NAME_LEN; + fprintf(stderr, + "Warning: root %llu INODE %s[%llu %llu] name too long\n", + root->objectid, + key->type == BTRFS_INODE_REF_KEY ? + "REF" : "EXTREF", + key->objectid, key->offset); + } + read_extent_buffer(node, ref_namebuf, + (unsigned long)(extref + 1), len); + + if (len != namelen || strncmp(ref_namebuf, name, len)) + goto next_extref; + + ret = 0; + goto out; + +next_extref: + len = sizeof(*extref) + ref_namelen; + extref = (struct btrfs_inode_extref *)((char *)extref + len); + cur += len; + + } +out: + btrfs_release_path(&path); + return ret; +} + static int all_backpointers_checked(struct extent_record *rec, int print_errs) { struct rb_node *n;