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

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Date:	Sat, 06 Aug 2016 12:54:07 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.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 #1 from Matthew L. Martin <mlmartin@...arsky-data.com> ---
The fault is in linux 4.4.16. After running the populate script for a few hours
du and df disagree a great deal:

# df -h /mnt/hdd_sd[gh]; du -hs  /mnt/hdd_sd[gh]
Filesystem      Size  Used Avail Use% Mounted on
/dev/sdg        5.5T  129G  5.3T   3% /mnt/hdd_sdg
/dev/sdh        5.5T   20G  5.4T   1% /mnt/hdd_sdh
20G    /mnt/hdd_sdg
20G    /mnt/hdd_sdh

# lsof | grep -e sdg -e sdh
jbd2/sdg- 32609           root  cwd       DIR              9,127      4096     
  192 /
jbd2/sdg- 32609           root  rtd       DIR              9,127      4096     
  192 /
jbd2/sdg- 32609           root  txt   unknown                                  
      /proc/32609/exe
jbd2/sdh- 32614           root  cwd       DIR              9,127      4096     
  192 /
jbd2/sdh- 32614           root  rtd       DIR              9,127      4096     
  192 /
jbd2/sdh- 32614           root  txt   unknown                                  
      /proc/32614/exe

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