From: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
To: Namjae Jeon <linkinjeon@gmail.com>
Cc: "Steven J. Magnani" <steve@digidescorp.com>,
Al Viro <viro@zeniv.linux.org.uk>,
akpm@linux-foundation.org, bfields@fieldses.org,
linux-kernel@vger.kernel.org,
Namjae Jeon <namjae.jeon@samsung.com>,
Ravishankar N <ravi.n1@samsung.com>,
Amit Sahrawat <a.sahrawat@samsung.com>
Subject: Re: [PATCH v2 1/5] fat: allocate persistent inode numbers
Date: Wed, 12 Sep 2012 00:47:22 +0900 [thread overview]
Message-ID: <871ui84l4l.fsf@devron.myhome.or.jp> (raw)
In-Reply-To: <CAKYAXd-gO5Pw=0unjB=YQJhu6W=g7VpZYnmHXkve-k8_4VjpgA@mail.gmail.com> (Namjae Jeon's message of "Wed, 12 Sep 2012 00:13:29 +0900")
Namjae Jeon <linkinjeon@gmail.com> writes:
>>> I think that it is unfixable because we can not know i_pos of inode
>>> changed by rename.
>>> And even though we know it, there is no rebuild inode routine in -mm.
>>> And It even can not fix in our patches.
>>
>>>> And are you tried https://lkml.org/lkml/2012/6/29/381 patches? It sounds
>>>> like to improve performance by enabling lookupcache.
>>> We checked this patches when facing estale issue in -mm.
>>> But It is no use, these patches just retry system call one more when
>>> estale error.
>>
>> What happens if client retried from lookup() after -ESTALE? (client NFS
>> doesn't have the name of entry anymore?)
> Need to rebuild inode routine because inode cache is already evicted on Server.
>>
>> I'm assuming the retry means - it restarts from building the NFS file
>> handle. I might be just wrong here though.
> As I remember, just retry in VFS of NFS client..I heard this patch is
> needed for
> a very specific set of circumstances where an entry goes stale once
> between the lookup and the actual operation(s).
> It is not related with current issues(inode cache eviction on server).
Supposing, the server/client state is after cold boot, and client try to
rename at first without any cache on client/server.
Even if this state, does the server return ESTALE? If it doesn't return
ESTALE, I can't understand why it is really unfixable.
If it returns ESTALE, why does it return? I'm assuming the previous code
path is the cached FH path.
--
OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
next prev parent reply other threads:[~2012-09-11 15:47 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-04 15:57 [PATCH v2 1/5] fat: allocate persistent inode numbers Namjae Jeon
2012-09-04 16:17 ` Al Viro
2012-09-05 14:08 ` Namjae Jeon
2012-09-05 14:56 ` OGAWA Hirofumi
2012-09-06 6:46 ` Namjae Jeon
2012-09-06 12:19 ` OGAWA Hirofumi
2012-09-06 13:39 ` Namjae Jeon
2012-09-07 7:01 ` Namjae Jeon
2012-09-07 12:15 ` Steven J. Magnani
2012-09-09 9:32 ` OGAWA Hirofumi
2012-09-09 11:29 ` OGAWA Hirofumi
2012-09-10 12:03 ` Namjae Jeon
2012-09-10 14:00 ` OGAWA Hirofumi
2012-09-11 12:00 ` Namjae Jeon
2012-09-11 12:31 ` OGAWA Hirofumi
2012-09-11 15:13 ` Namjae Jeon
2012-09-11 15:47 ` OGAWA Hirofumi [this message]
2012-09-12 14:12 ` Namjae Jeon
2012-09-12 14:32 ` J. Bruce Fields
2012-09-12 17:03 ` OGAWA Hirofumi
2012-09-12 17:11 ` J. Bruce Fields
2012-09-12 17:38 ` OGAWA Hirofumi
2012-09-12 17:45 ` J. Bruce Fields
2012-09-12 18:49 ` OGAWA Hirofumi
2012-09-13 8:11 ` Namjae Jeon
2012-09-13 8:33 ` OGAWA Hirofumi
2012-09-13 11:20 ` J. Bruce Fields
2012-09-13 12:17 ` OGAWA Hirofumi
2012-09-13 14:24 ` Namjae Jeon
2012-09-13 14:46 ` J. Bruce Fields
2012-09-13 15:34 ` OGAWA Hirofumi
2012-09-14 8:51 ` Namjae Jeon
2012-09-10 12:28 ` Steven J. Magnani
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