linux-ext4 - [Bug 151491] free space lossage on busy system with bigalloc enabled and 128KB cluster

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Date:   Mon, 20 Nov 2017 17:59:39 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 151491] free space lossage on busy system with bigalloc enabled
 and 128KB cluster

https://bugzilla.kernel.org/show_bug.cgi?id=151491

--- Comment #13 from Betacentauri (betacentauri@...or.de) ---
The ARM machine I use has very little free memory. So that fits to your
analysis. 
With your information I could also reproduce it in the xfstests environment
with nodelalloc. But only 2 times. I set memory in the virtual machine to 256MB
(in config.kvm). Then I mounted the filesystem with nodelalloc and executed
this little script several times:

#!/bin/bash

i=0
while [ $i -lt 10 ]; do
 dd if=/dev/zero of=./test$i bs=1M count=200 > /dev/null
 cp test$i testx_$i
 sync
 let i=i+1
 echo $i
done

Result was this:
root@...-xfstests:/media/test# ls -las
total 4097028
   256 drwxr-xr-x 3 root root      4096 Nov 20 17:43 .
     4 drwxr-xr-x 3 root root      4096 Nov 20 17:33 ..
   256 -rwxr-xr-x 1 root root       155 Nov 20 17:48 h.sh
   256 drwx------ 2 root root     16384 Nov 20 17:26 lost+found
204800 -rw-r--r-- 1 root root 209715200 Nov 20 17:48 test0
205056 -rw-r--r-- 1 root root 209715200 Nov 20 17:48 test1
204800 -rw-r--r-- 1 root root 209715200 Nov 20 17:48 test2
204800 -rw-r--r-- 1 root root 209715200 Nov 20 17:48 test3
204800 -rw-r--r-- 1 root root 209715200 Nov 20 17:48 test4
...

One file has size 205056. But I cannot really reproduce it.

So better focus on fixing the bug than on trying to reproduce it with
nodelalloc. If I find a way to reproduce, I'll let you know ;-)

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