linux-ext4 - [Bug 13930] non-contiguous files (64.9%) on a ext4 fs

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Message-Id: <200908072238.n77Mc0b4028521@demeter.kernel.org>
Date:	Fri, 7 Aug 2009 22:38:00 GMT
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 13930] non-contiguous files (64.9%) on a ext4 fs

http://bugzilla.kernel.org/show_bug.cgi?id=13930





--- Comment #3 from Cédric M <zelogik+bugzilla@...il.com>  2009-08-07 22:37:59 ---
I have make some try on a 242MB file:

du -h file
242M

And after an:
Filesystem type is: ef53
File size of ****** is 253480960 (61885 blocks, blocksize 4096)
 ext logical physical expected length flags
   0       0 215814144            2048 
   1    2048 215820288 215816191   2048 
   2    4096 215824384 215822335   2048 
   3    6144 215828480 215826431   2048 
   4    8192 215832576 215830527   2048 
   5   10240 215836672 215834623   2048 
   6   12288 215840768 215838719   2048 
   7   14336 215844864 215842815   2048 
   8   16384 215848960 215846911   2048 
   9   18432 215853056 215851007  26624 
  10   45056 215881728 215879679   2048 
  11   47104 215885824 215883775   2048 
  12   49152 215891968 215887871   2048 
  13   51200 215896064 215894015   2048 
  14   53248 215900160 215898111   2048 
  15   55296 215904256 215902207   2048 
  16   57344 215908352 215906303   2048 
  17   59392 215912448 215910399   2048 
  18   61440 215918592 215914495    445 eof


So why so much extend ?

(ie: ALL files have been write one to one on the whole disk (like a "cp -R
/cifs /ext4) (not torrent/crappy_speed_download_tools/etc ... things))




With a full dir: (for / du -h / filefrag / sed )
180M    
: 12 extents found
181M    
: 20 extents found
281M    
: 22 extents found
275M    
: 22 extents found
275M    
: 22 extents found
181M    
: 20 extents found
281M    
: 22 extents found
281M    
: 21 extents found
277M    
: 21 extents found
280M    
: 21 extents found
180M    
: 21 extents found
285M    
: 13 extents found
180M    
: 6 extents found

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