From patchwork Mon Apr 16 11:39:40 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zheng Liu X-Patchwork-Id: 152789 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id B548CB7003 for ; Mon, 16 Apr 2012 21:34:03 +1000 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752831Ab2DPLeB (ORCPT ); Mon, 16 Apr 2012 07:34:01 -0400 Received: from mail-pz0-f52.google.com ([209.85.210.52]:62902 "EHLO mail-pz0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752752Ab2DPLeA (ORCPT ); Mon, 16 Apr 2012 07:34:00 -0400 Received: by mail-pz0-f52.google.com with SMTP id e40so6801134dak.11 for ; Mon, 16 Apr 2012 04:34:00 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:x-mailer:in-reply-to:references; bh=0gNlz2BhyyFygEud91WILB38ORupua5D5XikDY4XMgY=; b=B1dDGgDJRYiZMkl9jAgiExyBa+cEcivqMDJtJwWJEQ5bd3kP4l8iTU9CV8gQDqa5hB PcPiGY8iMWY5U/YLWPhQoKwJMuIes3qNbSMXDFBZD46jIEdLSPRvT4HLbkbD1B4gXGAV HaKFfnKtl/AwD1l6/hO4VyoqFfZ9sUFleHFsIjgeu1XrXG3mqZGwqwM7p/hLy4ynMjls UWLmYug7Yh897hROLSQGfZqhKb1+THOdSOZAYjvoee4mHpAlkL5+qAB3usqX8IBsBwzx 6JKg4ZhHeL+Htyd1m9Y2Sq1NxOWJpkWAeTSPk7I59JNVsmnyDo/rcAzJI1rub5hT4VPa Rxmw== Received: by 10.68.202.167 with SMTP id kj7mr27932162pbc.9.1334576040603; Mon, 16 Apr 2012 04:34:00 -0700 (PDT) Received: from localhost.localdomain ([182.92.247.2]) by mx.google.com with ESMTPS id l6sm17474160pbp.33.2012.04.16.04.33.59 (version=TLSv1/SSLv3 cipher=OTHER); Mon, 16 Apr 2012 04:34:00 -0700 (PDT) From: Zheng Liu To: linux-ext4@vger.kernel.org Cc: Zheng Liu Subject: [PATCH 05/32] libext2fs: add ext2fs_find_entry_ext_attr function Date: Mon, 16 Apr 2012 19:39:40 +0800 Message-Id: <1334576407-4007-6-git-send-email-wenqing.lz@taobao.com> X-Mailer: git-send-email 1.7.4.1 In-Reply-To: <1334576407-4007-1-git-send-email-wenqing.lz@taobao.com> References: <1334576407-4007-1-git-send-email-wenqing.lz@taobao.com> Sender: linux-ext4-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ext4@vger.kernel.org From: Zheng Liu we need to search extend attributes to get entry of inline data. Thus, add this function to do this work. Signed-off-by: Zheng Liu --- lib/ext2fs/ext2fs.h | 3 +++ lib/ext2fs/ext_attr.c | 26 ++++++++++++++++++++++++++ 2 files changed, 29 insertions(+), 0 deletions(-) diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h index 89815eb..a6518be 100644 --- a/lib/ext2fs/ext2fs.h +++ b/lib/ext2fs/ext2fs.h @@ -1075,6 +1075,9 @@ extern errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, extern errcode_t ext2fs_adjust_ea_refcount2(ext2_filsys fs, blk64_t blk, char *block_buf, int adjust, __u32 *newcount); +extern errcode_t ext2fs_find_entry_ext_attr(struct ext2_ext_attr_entry **pentry, + int name_index, const char *name, + size_t size, int sorted); /* extent.c */ extern errcode_t ext2fs_extent_header_verify(void *ptr, int size); diff --git a/lib/ext2fs/ext_attr.c b/lib/ext2fs/ext_attr.c index 1889824..f027296 100644 --- a/lib/ext2fs/ext_attr.c +++ b/lib/ext2fs/ext_attr.c @@ -155,3 +155,29 @@ errcode_t ext2fs_adjust_ea_refcount(ext2_filsys fs, blk_t blk, { return ext2fs_adjust_ea_refcount(fs, blk, block_buf, adjust, newcount); } + +errcode_t ext2fs_find_entry_ext_attr(struct ext2_ext_attr_entry **pentry, + int name_index, const char *name, + size_t size, int sorted) +{ + struct ext2_ext_attr_entry *entry; + size_t name_len; + int cmp; + + if (name == NULL) + return -1; + name_len = strlen(name); + entry = *pentry; + for (; !EXT2_EXT_IS_LAST_ENTRY(entry); entry = EXT2_EXT_ATTR_NEXT(entry)) { + cmp = name_index - entry->e_name_index; + if (!cmp) + cmp = name_len - entry->e_name_len; + if (!cmp) + cmp = memcmp(name, EXT2_EXT_ATTR_NAME(entry), name_len); + if (!cmp) + break; + } + *pentry = entry; + + return cmp; +}