From patchwork Tue Dec 3 12:11:30 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Zheng Liu X-Patchwork-Id: 296157 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 0F13B2C009F for ; Tue, 3 Dec 2013 23:09:18 +1100 (EST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752614Ab3LCMJR (ORCPT ); Tue, 3 Dec 2013 07:09:17 -0500 Received: from mail-pa0-f47.google.com ([209.85.220.47]:62417 "EHLO mail-pa0-f47.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752485Ab3LCMJP (ORCPT ); Tue, 3 Dec 2013 07:09:15 -0500 Received: by mail-pa0-f47.google.com with SMTP id kq14so2873282pab.34 for ; Tue, 03 Dec 2013 04:09:15 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=tbNXypc8ctrgzxn8mL3QeFo5EsuaubqWfrXDbRUljoo=; b=n1BjkYMwlHqn2gfpCT9XrfBjRrH1dMSCot2eEzPNytRi+wiyQAw6haWeA8nmp+kvz+ BjW2gHHyAyb0I+nHXPQvWyiCi96u7BOmMC9qUMjo7d3MO8vD8fG/Bj9AbXvzhwTjza6/ UE3R3grgi0O87iVkbuiPN/GUo0ruky4jinwvjuF3kxBa+YTqK4418GdCQnQGFwG7Z9MI fC17gxaGI5qmVOS1Fd83Zb+hSroepFr4eLtEcyyn9CRhCDL7V8m/44O4bq2SFbSbSCVo 2MkBVQPHx9O7m7M6STz0vh8I0pawU3wgafEIXXdkd40j0UJZ/HQd5mba3lKWe/wxPeOc L+aQ== X-Received: by 10.68.52.231 with SMTP id w7mr38116740pbo.19.1386072555090; Tue, 03 Dec 2013 04:09:15 -0800 (PST) Received: from alpha.taobao.ali.com ([182.92.247.2]) by mx.google.com with ESMTPSA id xv2sm129628866pbb.39.2013.12.03.04.09.13 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 03 Dec 2013 04:09:14 -0800 (PST) From: Zheng Liu To: linux-ext4@vger.kernel.org Cc: Theodore Ts'o , "Darrick J. Wong" Subject: [PATCH v2 03/28] libext2fs: extend xattr api to query number of attrs Date: Tue, 3 Dec 2013 20:11:30 +0800 Message-Id: <1386072715-9869-4-git-send-email-wenqing.lz@taobao.com> X-Mailer: git-send-email 1.7.9.7 In-Reply-To: <1386072715-9869-1-git-send-email-wenqing.lz@taobao.com> References: <1386072715-9869-1-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: "Darrick J. Wong" Add another API to query the number of extended attributes. Signed-off-by: Darrick J. Wong --- lib/ext2fs/ext2fs.h | 1 + lib/ext2fs/ext_attr.c | 19 +++++++++++++++---- 2 files changed, 16 insertions(+), 4 deletions(-) diff --git a/lib/ext2fs/ext2fs.h b/lib/ext2fs/ext2fs.h index 57db793..e251435 100644 --- a/lib/ext2fs/ext2fs.h +++ b/lib/ext2fs/ext2fs.h @@ -1168,6 +1168,7 @@ errcode_t ext2fs_xattrs_open(ext2_filsys fs, ext2_ino_t ino, errcode_t ext2fs_xattrs_close(struct ext2_xattr_handle **handle); errcode_t ext2fs_free_ext_attr(ext2_filsys fs, ext2_ino_t ino, struct ext2_inode_large *inode); +size_t ext2fs_xattrs_count(struct ext2_xattr_handle *handle); /* 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 bfe95f4..2fae516 100644 --- a/lib/ext2fs/ext_attr.c +++ b/lib/ext2fs/ext_attr.c @@ -197,7 +197,7 @@ struct ext2_xattr { struct ext2_xattr_handle { ext2_filsys fs; struct ext2_xattr *attrs; - size_t length; + size_t length, count; ext2_ino_t ino; int dirty; }; @@ -575,7 +575,8 @@ out: static errcode_t read_xattrs_from_buffer(struct ext2_xattr_handle *handle, struct ext2_ext_attr_entry *entries, unsigned int storage_size, - void *value_start) + void *value_start, + size_t *nr_read) { struct ext2_xattr *x; struct ext2_ext_attr_entry *entry; @@ -648,6 +649,7 @@ static errcode_t read_xattrs_from_buffer(struct ext2_xattr_handle *handle, memcpy(x->value, value_start + entry->e_value_offs, entry->e_value_size); x++; + (*nr_read)++; entry = EXT2_EXT_ATTR_NEXT(entry); } @@ -697,7 +699,7 @@ errcode_t ext2fs_xattrs_read(struct ext2_xattr_handle *handle) inode->i_extra_isize + sizeof(__u32); err = read_xattrs_from_buffer(handle, start, storage_size, - start); + start, &handle->count); if (err) goto out; } @@ -737,7 +739,7 @@ read_ea_block: sizeof(struct ext2_ext_attr_header); start = block_buf + sizeof(struct ext2_ext_attr_header); err = read_xattrs_from_buffer(handle, start, storage_size, - block_buf); + block_buf, &handle->count); if (err) goto out3; @@ -848,6 +850,7 @@ errcode_t ext2fs_xattr_set(struct ext2_xattr_handle *handle, memcpy(last_empty->value, value, value_len); last_empty->value_len = value_len; handle->dirty = 1; + handle->count++; return 0; } @@ -868,6 +871,7 @@ errcode_t ext2fs_xattr_set(struct ext2_xattr_handle *handle, memcpy(x->value, value, value_len); x->value_len = value_len; handle->dirty = 1; + handle->count++; return 0; } @@ -886,6 +890,7 @@ errcode_t ext2fs_xattr_remove(struct ext2_xattr_handle *handle, ext2fs_free_mem(&x->value); x->value_len = 0; handle->dirty = 1; + handle->count--; return 0; } } @@ -910,6 +915,7 @@ errcode_t ext2fs_xattrs_open(ext2_filsys fs, ext2_ino_t ino, ext2fs_free_mem(&h); return err; } + h->count = 0; h->ino = ino; h->fs = fs; *handle = h; @@ -940,3 +946,8 @@ errcode_t ext2fs_xattrs_close(struct ext2_xattr_handle **handle) ext2fs_free_mem(handle); return 0; } + +size_t ext2fs_xattrs_count(struct ext2_xattr_handle *handle) +{ + return handle->count; +}