From: Shen Feng Subject: Re: [PATCH 2/2] ext4: Make ext4_ext_find_extent fills ext_path completely Date: Thu, 12 Jun 2008 08:28:23 +0800 Message-ID: <48506DA7.1070306@cn.fujitsu.com> References: <484F68BE.8040203@cn.fujitsu.com> <20080611114344.GF9008@skywalker> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: linux-ext4@vger.kernel.org, Theodore Tso , Mingming Cao , Andrew Morton To: "Aneesh Kumar K.V" Return-path: Received: from cn.fujitsu.com ([222.73.24.84]:53421 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1752487AbYFLAby (ORCPT ); Wed, 11 Jun 2008 20:31:54 -0400 In-Reply-To: <20080611114344.GF9008@skywalker> Sender: linux-ext4-owner@vger.kernel.org List-ID: Aneesh Kumar K.V Wrote: > On Wed, Jun 11, 2008 at 01:55:10PM +0800, Shen Feng wrote: >> When pos=0 or depth, the fields of ext4_ext_path is not >> completely filled. >> This patch also removes some unnecessary code. >> >> Signed-off-by: Shen Feng >> --- >> fs/ext4/extents.c | 4 ++-- >> 1 files changed, 2 insertions(+), 2 deletions(-) >> >> diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c >> index d4f76d7..ff609df 100644 >> --- a/fs/ext4/extents.c >> +++ b/fs/ext4/extents.c >> @@ -524,6 +524,7 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, >> alloc = 1; >> } >> path[0].p_hdr = eh; >> + path[0].p_bh = NULL; > > > We did a kzalloc before. So do we need this ? If the path is not allocated by kzalloc, we need this. > > > >> i = depth; >> /* walk through the tree */ >> @@ -552,12 +553,11 @@ ext4_ext_find_extent(struct inode *inode, ext4_lblk_t block, >> } >> >> path[ppos].p_depth = i; >> - path[ppos].p_hdr = eh; > > > This is needed. Because we look at extent_header in ext_binsearch. This has been done in the last while loop. > > > >> - path[ppos].p_ext = NULL; >> path[ppos].p_idx = NULL; >> >> /* find extent */ >> ext4_ext_binsearch(inode, path + ppos, block); >> + path[ppos].p_block = ext4_ext_pblock(path[ppos].p_ext); >> >> ext4_ext_show_path(inode, path); >> > > -aneesh > >