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: [PATCH 0/4] Series short description
Date: Mon, 08 Aug 2011 17:37:52 +0200 [thread overview]
Message-ID: <20110808153432.1872437.85783.stgit@fsdevel3> (raw)
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
next reply other threads:[~2011-08-08 15:37 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-08 15:37 Bernd Schubert [this message]
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
2011-08-09 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
2011-08-09 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 ` [PATCH 0/4] 32/64 bit llseek hashes v2 Bernd Schubert
-- strict thread matches above, loose matches on Subject: below --
2010-11-22 0:31 [PATCH 0/4] Series short description Alexey Zaytsev
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