linux-ext4 - Re: [PATCH 4/4] ext4: fix suboptimal seek

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Date:	Fri, 2 Jan 2015 15:03:01 -0500
From:	Theodore Ts'o <tytso@....edu>
To:	Dmitry Monakhov <dmonakhov@...nvz.org>
Cc:	linux-ext4@...r.kernel.org
Subject: Re: [PATCH 4/4] ext4: fix suboptimal seek_{data,hole} extents
 traversial

On Sun, Dec 28, 2014 at 11:13:10PM -0500, Theodore Ts'o wrote:
> On Sun, Dec 28, 2014 at 10:55:46PM +0400, Dmitry Monakhov wrote:
> > Yes. I've already sent you updated patches
> > https://patchwork.ozlabs.org/patch/422594/
> > https://patchwork.ozlabs.org/patch/422595/
> 
> Thanks, this somehow got lost from my inbox.  I'm not sure how it
> happened, but I do see it in patchwork.

I tried applying both of these patches, but I'm still seeing a failure:

% git log --oneline -2
e195ba5 ext4: fix seek_data for indirect layout
dd634e3 ext4: fix seek_data cleanup

# uname -a
Linux kvm-xfstests 3.18.0-rc3-00003-ge195ba5 #2548 SMP Fri Jan 2 14:35:32 EST 2015 i686 GNU/Linux
# mke2fs -t ext4 -O ^extent,^flex_bg,^uninit_bg -Fq /dev/vdd
/dev/vdd contains a ext4 file system
	 last mounted on /vdd on Fri Jan  2 14:49:58 2015
# mount -t ext4 -o nodelalloc /dev/vdd /vdd
# xfstests/src/seek_sanity_test  /vdd/seek_sanity_testfile
File system magic#: 0xef53
Allocation size: 4096

...
10. Test a huge file for offset overflow
10.01 SEEK_HOLE expected 65536 or 0, got 0.                       FAIL
10.02 SEEK_HOLE expected 65536 or 0, got 1.                       FAIL
10.03 SEEK_DATA expected 0 or 0, got -1.                          FAIL
10.04 SEEK_DATA expected 1 or 1, got -1.                          FAIL
10.05 SEEK_HOLE expected 0 or 0, got -65536.                      FAIL
10.06 SEEK_DATA expected -65536 or -65536, got -1.                FAIL
10.07 SEEK_DATA expected -65535 or -65535, got -1.                FAIL
10.08 SEEK_DATA expected -65536 or -65536, got -1.                FAIL

I'm getting the exact same failure with a kernel compiled with

# CONFIG_EXT3_FS is not set
CONFIG_EXT4_USE_FOR_EXT23=y

and then using "mke2fs -t ext3 -Fq /dev/vdd" and "mount -t ext3
/dev/vdd /vdd" and I'm seeing the same failure.  Which really worries
me, since that's something that many more users will be using.

At this point I'm beginning to think that we would be better off
reverting 14516bb7bb6 until we can figure out what is going on.  I'm
really wondering why you're not seeing this failure, but I am.

       		     	    	       	    - Ted
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