From: Andreas Dilger <adilger@sun.com>
To: "Theodore Ts'o" <tytso@mit.edu>
Cc: linux-ext4@vger.kernel.org, aneesh.kumar@linux.vnet.ibm.com
Subject: Re: [PATCH, RFC] ext4: Automatically allocate delay allocated blocks on close
Date: Tue, 24 Feb 2009 03:13:44 -0700 [thread overview]
Message-ID: <20090224101344.GN3199@webber.adilger.int> (raw)
In-Reply-To: <1235451952-2726-6-git-send-email-tytso@mit.edu>
On Feb 24, 2009 00:05 -0500, Theodore Ts'o wrote:
> When closing a file that had been previously truncated, force any
> delay allocated blocks that to be allocated so that if the filesystem
> is mounted with data=ordered, the data blocks will be pushed out to
> disk along with the journal commit. Many application programs expect
> this, so we do this to avoid zero length files if the system crashes
> unexpectedly.
Should this only be done with "truncate-to-zero" operations, or any
truncate? Some applications may do extending truncates in order to
trigger file preallocation ala Windows, and we don't necessarily want
to punish all of the IO for those files.
Cheers, Andreas
--
Andreas Dilger
Sr. Staff Engineer, Lustre Group
Sun Microsystems of Canada, Inc.
next prev parent reply other threads:[~2009-02-24 10:14 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-02-24 5:05 [PATCH, RFC] Clean up of delalloc code and map-on-close/rename fixes Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: Simplify delalloc implementation by removing mpd.get_block Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: Save stack space by removing fake buffer heads Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: Simplify delalloc code by removing mpage_da_writepages() Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: Automatically allocate delay allocated blocks on close Theodore Ts'o
2009-02-24 5:05 ` [PATCH, RFC] ext4: Automatically allocate delay allocated blocks on rename Theodore Ts'o
2009-02-24 10:13 ` Andreas Dilger [this message]
2009-02-24 13:21 ` [PATCH, RFC] ext4: Automatically allocate delay allocated blocks on close Theodore Tso
2009-02-24 9:38 ` [PATCH, RFC] ext4: add EXT4_IOC_ALLOC_DA_BLKS ioctl Aneesh Kumar K.V
2009-02-24 13:14 ` Theodore Tso
2009-02-24 10:11 ` Andreas Dilger
2009-02-24 13:16 ` Theodore Tso
2009-03-11 22:41 ` Eric Sandeen
2009-03-12 5:29 ` Aneesh Kumar K.V
2009-03-12 16:32 ` Eric Sandeen
2009-03-12 20:04 ` Theodore Tso
2009-03-12 20:05 ` Eric Sandeen
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