From: Eric Sandeen <sandeen@sandeen.net>
To: Ted Ts'o <tytso@mit.edu>
Cc: "Andreas Dilger" <adilger@dilger.ca>,
"Yongqiang Yang" <xiaoqiangnk@gmail.com>,
xfs-oss <xfs@oss.sgi.com>,
"coreutils@gnu.org" <coreutils@gnu.org>,
"linux-ext4@vger.kernel.org" <linux-ext4@vger.kernel.org>,
"Pádraig Brady" <P@draigbrady.com>,
"Markus Trippelsdorf" <markus@trippelsdorf.de>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
Date: Mon, 18 Apr 2011 22:05:15 -0500 [thread overview]
Message-ID: <4DACFBEB.9040909@sandeen.net> (raw)
In-Reply-To: <20110419025949.GA3030@thunk.org>
On 4/18/11 9:59 PM, Ted Ts'o wrote:
...
> Maybe coreutils will need to use FIEMAP_FLAG_SYNC initially, since
> it's the only way to guarantee correct behaviour for XFS. But I would
> really rather that be the long-term way we leave things!
XFS ... or ext4:
# xfs_io -Ff -c "falloc 0 1m" -c "pwrite 0 512k" testfile; /root/fiemap-test testfile
wrote 524288/524288 bytes at offset 0
512 KiB, 128 ops; 0.0000 sec (161.342 MiB/sec and 41303.6463 ops/sec)
start 0 length -1 flags 0x0 count 32
ext: 0 logical: [ 0.. 255] phys: 34048.. 34303 flags: 0x801 tot: 256
# uname -r
2.6.39-0.rc3.git2.0.fc16.x86_64
Above is on ext4. It behaves exactly like XFS in my testing; data in the page cache does not cause fiemap to return anything other than "unwritten" for preallocated extents.
-Eric
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next prev parent reply other threads:[~2011-04-19 3:02 UTC|newest]
Thread overview: 61+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-04-14 10:26 Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?) Markus Trippelsdorf
2011-04-14 12:06 ` Markus Trippelsdorf
2011-04-14 14:02 ` Markus Trippelsdorf
2011-04-14 14:59 ` Pádraig Brady
2011-04-14 15:50 ` Eric Sandeen
2011-04-14 15:52 ` Pádraig Brady
2011-04-14 15:56 ` Eric Sandeen
2011-04-14 16:03 ` Markus Trippelsdorf
2011-04-14 16:14 ` Eric Sandeen
2011-04-14 16:21 ` Yongqiang Yang
2011-04-14 16:28 ` Markus Trippelsdorf
2011-04-14 16:31 ` Eric Sandeen
2011-04-14 16:48 ` Markus Trippelsdorf
2011-04-14 16:49 ` Eric Sandeen
2011-04-14 16:04 ` Yongqiang Yang
2011-04-14 16:10 ` Yongqiang Yang
2011-05-05 11:29 ` Pádraig Brady
2011-05-05 11:47 ` Yongqiang Yang
2011-04-14 17:27 ` Jim Meyering
2011-04-14 19:13 ` Pádraig Brady
2011-04-14 19:39 ` Jim Meyering
2011-04-14 22:59 ` Dave Chinner
2011-04-14 23:29 ` Pádraig Brady
2011-04-15 0:09 ` Dave Chinner
2011-04-15 5:01 ` Andreas Dilger
2011-04-16 0:50 ` Dave Chinner
2011-04-16 5:11 ` Andreas Dilger
2011-04-16 12:21 ` Theodore Tso
2011-04-18 0:40 ` Dave Chinner
2011-04-18 2:45 ` Andreas Dilger
2011-04-19 1:58 ` Yongqiang Yang
2011-04-19 2:59 ` Ted Ts'o
2011-04-19 3:05 ` Eric Sandeen [this message]
2011-04-21 20:12 ` Jim Meyering
2011-04-19 3:30 ` Yongqiang Yang
2011-04-19 4:14 ` Dave Chinner
2011-04-19 5:27 ` Christoph Hellwig
2011-04-19 3:44 ` Dave Chinner
2011-04-19 6:53 ` Yongqiang Yang
2011-04-19 7:45 ` Dave Chinner
2011-04-19 8:11 ` Yongqiang Yang
2011-04-19 14:05 ` Eric Sandeen
2011-04-19 14:09 ` Ted Ts'o
2011-04-19 14:13 ` Eric Sandeen
2011-04-19 16:01 ` Ted Ts'o
2011-04-20 1:53 ` Yongqiang Yang
2011-04-20 15:21 ` Christoph Hellwig
2011-04-20 17:21 ` Ted Ts'o
2011-04-19 21:08 ` Dave Chinner
2011-04-20 15:29 ` Christoph Hellwig
2011-04-16 6:05 ` Yongqiang Yang
2011-04-18 0:35 ` Dave Chinner
2011-04-15 8:53 ` Jim Meyering
2011-04-15 17:16 ` Christoph Hellwig
2011-04-15 17:24 ` Eric Blake
2011-04-15 17:26 ` Christoph Hellwig
2011-04-15 22:28 ` Andreas Dilger
2011-04-16 0:25 ` Dave Chinner
2011-04-14 14:39 ` Eric Sandeen
2011-04-20 14:39 ` Jim Meyering
2011-04-21 20:01 ` Jim Meyering
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