From: Eric Sandeen <sandeen@sandeen.net>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: "Pádraig Brady" <P@draigBrady.com>, xfs-oss <xfs@oss.sgi.com>,
linux-ext4@vger.kernel.org, coreutils@gnu.org
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
Date: Thu, 14 Apr 2011 11:14:59 -0500 [thread overview]
Message-ID: <4DA71D83.5040601@sandeen.net> (raw)
In-Reply-To: <20110414160343.GA12787@x4.trippels.de>
On 4/14/11 11:03 AM, Markus Trippelsdorf wrote:
> On 2011.04.14 at 10:56 -0500, Eric Sandeen wrote:
...
>> well, if I simply take the preallocation step out of the testcase, it works fine on xfs without a sync.
>>
>> So I still don't know what Markus hit...
>
> Maybe it's delalloc:
>
> x4 /tmp # dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=k
> 10+0 records in
> 10+0 records out
> 5120 bytes (5.1 kB) copied, 0.0021822 s, 2.3 MB/s
> x4 /tmp # filefrag -v k
> Filesystem type is: 58465342
> File size of k is 5120 (2 blocks, blocksize 4096)
> ext logical physical expected length flags
> 0 0 0 16 unknown,delalloc,eof
> k: 1 extent found
> x4 /tmp # sync
> x4 /tmp # filefrag -v k
> Filesystem type is: 58465342
> File size of k is 5120 (2 blocks, blocksize 4096)
> ext logical physical expected length flags
> 0 0 26960045 16 eof
> k: 1 extent found
>
well filefrag still returns that it knows of a valid range from logical blocks 0 to 16, so cp should have something to copy...
-Eric
WARNING: multiple messages have this Message-ID (diff)
From: Eric Sandeen <sandeen@sandeen.net>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: linux-ext4@vger.kernel.org, "Pádraig Brady" <P@draigBrady.com>,
coreutils@gnu.org, xfs-oss <xfs@oss.sgi.com>
Subject: Re: Files full of zeros with coreutils-8.11 and xfs (FIEMAP related?)
Date: Thu, 14 Apr 2011 11:14:59 -0500 [thread overview]
Message-ID: <4DA71D83.5040601@sandeen.net> (raw)
In-Reply-To: <20110414160343.GA12787@x4.trippels.de>
On 4/14/11 11:03 AM, Markus Trippelsdorf wrote:
> On 2011.04.14 at 10:56 -0500, Eric Sandeen wrote:
...
>> well, if I simply take the preallocation step out of the testcase, it works fine on xfs without a sync.
>>
>> So I still don't know what Markus hit...
>
> Maybe it's delalloc:
>
> x4 /tmp # dd count=10 if=/dev/urandom conv=notrunc iflag=fullblock of=k
> 10+0 records in
> 10+0 records out
> 5120 bytes (5.1 kB) copied, 0.0021822 s, 2.3 MB/s
> x4 /tmp # filefrag -v k
> Filesystem type is: 58465342
> File size of k is 5120 (2 blocks, blocksize 4096)
> ext logical physical expected length flags
> 0 0 0 16 unknown,delalloc,eof
> k: 1 extent found
> x4 /tmp # sync
> x4 /tmp # filefrag -v k
> Filesystem type is: 58465342
> File size of k is 5120 (2 blocks, blocksize 4096)
> ext logical physical expected length flags
> 0 0 26960045 16 eof
> k: 1 extent found
>
well filefrag still returns that it knows of a valid range from logical blocks 0 to 16, so cp should have something to copy...
-Eric
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next prev parent reply other threads:[~2011-04-14 16:15 UTC|newest]
Thread overview: 117+ 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
[not found] ` <20110414140222.GB1679-tLCgZGx+iJ+kxVt8IV0GqQ@public.gmane.org>
2011-04-14 14:59 ` Pádraig Brady
2011-04-14 14:59 ` Pádraig Brady
[not found] ` <4DA70BD3.1070409-V8g9lnOeT5ydJdNcDFJN0w@public.gmane.org>
2011-04-14 15:50 ` Eric Sandeen
2011-04-14 15:50 ` Eric Sandeen
[not found] ` <4DA717B2.3020305-+82itfer+wXR7s880joybQ@public.gmane.org>
2011-04-14 15:52 ` Pádraig Brady
2011-04-14 15:52 ` Pádraig Brady
2011-04-14 15:56 ` Eric Sandeen
2011-04-14 15:56 ` Eric Sandeen
2011-04-14 16:03 ` Markus Trippelsdorf
2011-04-14 16:03 ` Markus Trippelsdorf
2011-04-14 16:14 ` Eric Sandeen [this message]
2011-04-14 16:14 ` Eric Sandeen
[not found] ` <20110414160343.GA12787-tLCgZGx+iJ+kxVt8IV0GqQ@public.gmane.org>
2011-04-14 16:21 ` Yongqiang Yang
2011-04-14 16:21 ` Yongqiang Yang
[not found] ` <BANLkTimRxvBMp9M7zwiUY_UmmFOY5N58+A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-04-14 16:28 ` Markus Trippelsdorf
2011-04-14 16:28 ` Markus Trippelsdorf
2011-04-14 16:31 ` Eric Sandeen
2011-04-14 16:31 ` Eric Sandeen
2011-04-14 16:48 ` Markus Trippelsdorf
2011-04-14 16:48 ` Markus Trippelsdorf
2011-04-14 16:49 ` Eric Sandeen
2011-04-14 16:49 ` Eric Sandeen
2011-04-14 16:04 ` Yongqiang Yang
2011-04-14 16:04 ` Yongqiang Yang
2011-04-14 16:10 ` Yongqiang Yang
2011-04-14 16:10 ` Yongqiang Yang
[not found] ` <BANLkTimoLeWMJgNFGW+zdeUeJyZ-_+8fMQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-05-05 11:29 ` Pádraig Brady
2011-05-05 11:29 ` Pádraig Brady
2011-05-05 11:47 ` Yongqiang Yang
2011-05-05 11:47 ` Yongqiang Yang
[not found] ` <4DA7182B.8050409-V8g9lnOeT5ydJdNcDFJN0w@public.gmane.org>
2011-04-14 17:27 ` Jim Meyering
2011-04-14 17:27 ` Jim Meyering
2011-04-14 19:13 ` Pádraig Brady
2011-04-14 19:13 ` Pádraig Brady
[not found] ` <878vvcspz0.fsf-CybKA8TIZ99x3y/oJEDuiw@public.gmane.org>
2011-04-14 19:39 ` Jim Meyering
2011-04-14 19:39 ` Jim Meyering
2011-04-14 22:59 ` Dave Chinner
2011-04-14 23:29 ` Pádraig Brady
2011-04-14 23:29 ` Pádraig Brady
2011-04-15 0:09 ` Dave Chinner
2011-04-15 0:09 ` Dave Chinner
2011-04-15 5:01 ` Andreas Dilger
2011-04-15 5:01 ` Andreas Dilger
2011-04-16 0:50 ` Dave Chinner
2011-04-16 0:50 ` Dave Chinner
2011-04-16 5:11 ` Andreas Dilger
2011-04-16 5:11 ` Andreas Dilger
2011-04-16 12:21 ` Theodore Tso
2011-04-16 12:21 ` Theodore Tso
2011-04-18 0:40 ` Dave Chinner
2011-04-18 0:40 ` Dave Chinner
2011-04-18 2:45 ` Andreas Dilger
2011-04-18 2:45 ` Andreas Dilger
2011-04-19 1:58 ` Yongqiang Yang
2011-04-19 1:58 ` Yongqiang Yang
[not found] ` <BANLkTin=WEpSf6ddiOMNMOpCPP-wiEttSw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-04-19 2:59 ` Ted Ts'o
2011-04-19 2:59 ` Ted Ts'o
[not found] ` <20110419025949.GA3030-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2011-04-19 3:05 ` Eric Sandeen
2011-04-19 3:05 ` Eric Sandeen
[not found] ` <4DACFBEB.9040909-+82itfer+wXR7s880joybQ@public.gmane.org>
2011-04-21 20:12 ` Jim Meyering
2011-04-21 20:12 ` Jim Meyering
2011-04-19 3:30 ` Yongqiang Yang
2011-04-19 3:30 ` Yongqiang Yang
2011-04-19 4:14 ` Dave Chinner
2011-04-19 4:14 ` Dave Chinner
2011-04-19 5:27 ` Christoph Hellwig
2011-04-19 5:27 ` Christoph Hellwig
2011-04-19 3:44 ` Dave Chinner
2011-04-19 3:44 ` Dave Chinner
2011-04-19 6:53 ` Yongqiang Yang
2011-04-19 6:53 ` Yongqiang Yang
2011-04-19 7:45 ` Dave Chinner
2011-04-19 7:45 ` Dave Chinner
2011-04-19 8:11 ` Yongqiang Yang
2011-04-19 8:11 ` Yongqiang Yang
2011-04-19 14:05 ` Eric Sandeen
2011-04-19 14:05 ` Eric Sandeen
2011-04-19 14:09 ` Ted Ts'o
2011-04-19 14:09 ` Ted Ts'o
2011-04-19 14:13 ` Eric Sandeen
2011-04-19 14:13 ` Eric Sandeen
2011-04-19 16:01 ` Ted Ts'o
2011-04-19 16:01 ` Ted Ts'o
2011-04-20 1:53 ` Yongqiang Yang
2011-04-20 1:53 ` Yongqiang Yang
2011-04-20 15:21 ` Christoph Hellwig
2011-04-20 15:21 ` Christoph Hellwig
2011-04-20 17:21 ` Ted Ts'o
2011-04-20 17:21 ` Ted Ts'o
[not found] ` <20110419140909.GD3030-AKGzg7BKzIDYtjvyW6yDsg@public.gmane.org>
2011-04-19 21:08 ` Dave Chinner
2011-04-19 21:08 ` Dave Chinner
2011-04-20 15:29 ` Christoph Hellwig
2011-04-20 15:29 ` Christoph Hellwig
2011-04-16 6:05 ` Yongqiang Yang
2011-04-16 6:05 ` Yongqiang Yang
2011-04-18 0:35 ` Dave Chinner
2011-04-18 0:35 ` Dave Chinner
2011-04-15 8:53 ` Jim Meyering
2011-04-15 8:53 ` Jim Meyering
2011-04-15 17:16 ` Christoph Hellwig
2011-04-15 17:16 ` Christoph Hellwig
[not found] ` <20110415171629.GA9088-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2011-04-15 17:24 ` Eric Blake
2011-04-15 17:24 ` Eric Blake
2011-04-15 17:26 ` Christoph Hellwig
2011-04-15 17:26 ` Christoph Hellwig
[not found] ` <20110415172603.GA20086-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2011-04-15 22:28 ` Andreas Dilger
2011-04-15 22:28 ` Andreas Dilger
2011-04-16 0:25 ` Dave Chinner
2011-04-16 0:25 ` Dave Chinner
2011-04-14 14:39 ` Eric Sandeen
[not found] ` <20110414102608.GA1678-tLCgZGx+iJ+kxVt8IV0GqQ@public.gmane.org>
2011-04-20 14:39 ` Jim Meyering
2011-04-20 14:39 ` Jim Meyering
[not found] ` <87d3khugv1.fsf-CybKA8TIZ99x3y/oJEDuiw@public.gmane.org>
2011-04-21 20:01 ` Jim Meyering
2011-04-21 20:01 ` Jim Meyering
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