From: Bernd Schubert <bernd.schubert-mPn0NPGs4xGatNDF+KUbs4QuADTiUCJX@public.gmane.org>
To: linux-nfs-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-ext4-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Cc: hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org,
yong.fan-KloliPT79xf2eFz/2MeuCQ@public.gmane.org,
linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
tytso-3s7WtUTddSA@public.gmane.org,
adilger-KloliPT79xf2eFz/2MeuCQ@public.gmane.org
Subject: Re: [PATCH 0/4] 32/64 bit llseek hashes v2
Date: Mon, 08 Aug 2011 17:47:21 +0200 [thread overview]
Message-ID: <4E400509.8090804@itwm.fraunhofer.de> (raw)
In-Reply-To: <20110808153432.1872437.85783.stgit@fsdevel3>
Oh sorry, I forgot to set the correct subject line in my stg command line :(
On 08/08/2011 05:37 PM, Bernd Schubert wrote:
> With the ext3/ext4 directory index implementation hashes are used to specify
> offsets for llseek(). For compatibility with NFSv2 and 32-bit user space
> on 64-bit systems (kernel space) ext3/ext4 currently only return 32-bit
> hashes and therefore the probability of hash collisions for larger directories
> is rather high. As recently reported on the NFS mailing list that theoretical
> problem also happens on real systems:
> http://comments.gmane.org/gmane.linux.nfs/40863
>
> The following series adds two new f_mode flags to tell ext4
> to use 32-bit or 64-bit hash values for llseek() calls.
> These flags can then used by network file systems, such as NFS, to
> request 32-bit or 64-bit offsets (hashes).
>
> Version 2:
> - use f_mode instead of O_* flags and also in a separate patch
> - introduce EXT4_HTREE_EOF_32BIT and EXT4_HTREE_EOF_64BIT
> - fix SEEK_END in ext4_dir_llseek()
> - set f_mode flags in NFS code as early as possible and introduce a new
> NFSD_MAY_64BIT_COOKIE flag for that
>
> --
> Bernd Schubert
> Fraunhofer ITWM
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
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WARNING: multiple messages have this Message-ID (diff)
From: Bernd Schubert <bernd.schubert@itwm.fraunhofer.de>
To: linux-nfs@vger.kernel.org, linux-ext4@vger.kernel.org
Cc: hch@infradead.org, yong.fan@whamcloud.com,
linux-fsdevel@vger.kernel.org, tytso@mit.edu,
adilger@whamcloud.com
Subject: Re: [PATCH 0/4] 32/64 bit llseek hashes v2
Date: Mon, 08 Aug 2011 17:47:21 +0200 [thread overview]
Message-ID: <4E400509.8090804@itwm.fraunhofer.de> (raw)
In-Reply-To: <20110808153432.1872437.85783.stgit@fsdevel3>
Oh sorry, I forgot to set the correct subject line in my stg command line :(
On 08/08/2011 05:37 PM, Bernd Schubert wrote:
> With the ext3/ext4 directory index implementation hashes are used to specify
> offsets for llseek(). For compatibility with NFSv2 and 32-bit user space
> on 64-bit systems (kernel space) ext3/ext4 currently only return 32-bit
> hashes and therefore the probability of hash collisions for larger directories
> is rather high. As recently reported on the NFS mailing list that theoretical
> problem also happens on real systems:
> http://comments.gmane.org/gmane.linux.nfs/40863
>
> The following series adds two new f_mode flags to tell ext4
> to use 32-bit or 64-bit hash values for llseek() calls.
> These flags can then used by network file systems, such as NFS, to
> request 32-bit or 64-bit offsets (hashes).
>
> Version 2:
> - use f_mode instead of O_* flags and also in a separate patch
> - introduce EXT4_HTREE_EOF_32BIT and EXT4_HTREE_EOF_64BIT
> - fix SEEK_END in ext4_dir_llseek()
> - set f_mode flags in NFS code as early as possible and introduce a new
> NFSD_MAY_64BIT_COOKIE flag for that
>
> --
> Bernd Schubert
> Fraunhofer ITWM
> --
> To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2011-08-08 15:47 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-08 15:37 [PATCH 0/4] Series short description Bernd Schubert
2011-08-08 15:37 ` [PATCH 1/4] Add new FMODE flags: FMODE_32bithash and FMODE_64bithash Bernd Schubert
2011-08-08 15:38 ` [PATCH 2/4] Return 32/64-bit dir name hash according to usage type Bernd Schubert
2011-08-08 15:38 ` [PATCH 3/4] RFC: Remove check for a 32-bit cookie in nfsd4_readdir() Bernd Schubert
2011-08-08 15:38 ` Bernd Schubert
2011-08-09 17:31 ` J. Bruce Fields
2011-08-09 17:39 ` Boaz Harrosh
2011-08-09 18:05 ` J. Bruce Fields
2011-08-08 15:38 ` [PATCH 4/4] nfsd: vfs_llseek() with 32 or 64 bit offsets (hashes) Bernd Schubert
2011-08-08 15:38 ` Bernd Schubert
2011-08-09 17:33 ` J. Bruce Fields
2011-08-10 19:13 ` Bernd Schubert
2011-08-10 19:35 ` J. Bruce Fields
2011-08-08 15:47 ` Bernd Schubert [this message]
2011-08-08 15:47 ` [PATCH 0/4] 32/64 bit llseek hashes v2 Bernd Schubert
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