linux-kernel - Re: [pnfs] [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT case to use of do

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Date:	Thu, 25 Mar 2010 16:07:50 +0200
From:	Benny Halevy <bhalevy@...asas.com>
To:	Al Viro <viro@...IV.linux.org.uk>
CC:	Boaz Harrosh <bharrosh@...asas.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"J. Bruce Fields" <bfields@...i.umich.edu>,
	pNFS Mailing List <pnfs@...ux-nfs.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Doug Nazar <nazard.lkml@...il.com>,
	Trond Myklebust <Trond.Myklebust@...app.com>
Subject: Re: [pnfs] [GIT BISECT] first bad commit: 1f36f774 Switch !O_CREAT
 case to use of do_last()

On Mar. 25, 2010, 16:06 +0200, Al Viro <viro@...IV.linux.org.uk> wrote:
> On Thu, Mar 25, 2010 at 03:52:25PM +0200, Benny Halevy wrote:
>> On Mar. 25, 2010, 15:37 +0200, Al Viro <viro@...IV.linux.org.uk> wrote:
>>> On Thu, Mar 25, 2010 at 03:30:22PM +0200, Boaz Harrosh wrote:
>>>>> Let's try this: before do_lookup() call there add
>>>>> 	if (*want_dir)
>>>>> 		nd->flags |= LOOKUP_DIRECTORY;
>>>> Yes this fixes it!!
>>>> 2.6.34-rc2 plus above, now works, horay. (diff attached)
>>>>
>>>>> and see how does it behave.
>>>>>
>>>>> However, even if it does help, it doesn't explain everything.  Normal
>>>>> open() on a directory without O_DIRECTORY if flags shouldn't fail with
>>>>> -EISDIR.  How did that manage to avoid it all along?
>>> Does open() of directory _without_ O_DIRECTORY work in e.g. vanilla 2.6.33?
>>> It certainly does for local filesystems and it does for NFSv3; does it work
>>> for NFSv4?
>> No, it doesn't.
>>
>> # mount localhost:/usr0/nfs4export /mnt/localhost; strace cat /mnt/localhost/server 2>&1 | grep 'open.*server'; umount /mnt/localhost
>> open("/mnt/localhost/server", O_RDONLY) = 3
>>
>> # mount -t nfs4 localhost:/ /mnt/localhost; strace cat /mnt/localhost/server 2>&1 | grep 'open.*server'; umount /mnt/localhost
>> open("/mnt/localhost/server", O_RDONLY) = -1 EISDIR (Is a directory)
> 
> Gets better - if you do ls -l /mnt/localhost/server and then repeat that
> open(), it'll succeed.

Correct :)
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