** Description changed:

  I have already reported this upstream. on ext4, fiemap will not report
  extents if the requested logical region of a file overlaps the extent
  less than blocksize. So, if you request star=0, len=100, you will get
  nothing.
  
  I can provide example code, if you need.
  
- ProblemType: Bug
- Architecture: amd64
- AudioDevicesInUse:
-  USER        PID ACCESS COMMAND
-  /dev/snd/controlC0:  leonard    2213 F.... pulseaudio
- CRDA: Error: [Errno 2] No such file or directory
- Card0.Amixer.info:
-  Card hw:0 'Intel'/'HDA Intel at 0xf8400000 irq 20'
-    Mixer name : 'Realtek ALC268'
-    Components : 'HDA:10ec0268,14c00025,00100003 
HDA:10573055,10573055,00100700'
-    Controls      : 16
-    Simple ctrls  : 13
- Date: Wed Nov  4 20:10:06 2009
- DistroRelease: Ubuntu 9.10
- HibernationDevice: RESUME=UUID=ba65435a-214b-4e4e-9f46-7ced4d729ad0
- MachineType: - N/A
- NonfreeKernelModules: nvidia
- Package: linux-image-2.6.31-14-generic 2.6.31-14.48
- ProcCmdLine: root=UUID=423f8f68-484f-4773-94bf-da17f38c0dac ro 
rootfstype=ext4 quiet splash  crashkernel=384M-2G:64M,2G-:128M
- ProcEnviron:
-  LANGUAGE=de_AT.UTF-8
-  PATH=(custom, user)
-  LANG=de_AT.UTF-8
-  SHELL=/bin/bash
-  LC_NUMERIC=en_US.UTF-8
- ProcVersionSignature: Ubuntu 2.6.31-14.48-generic
- RelatedPackageVersions:
-  linux-backports-modules-2.6.31-14-generic 2.6.31-14.16
-  linux-firmware 1.24
+ There is a patch attached to this bug report.
+ 
  SourcePackage: linux
  Uname: Linux 2.6.31-14-generic x86_64
- WpaSupplicantLog:
-  
- dmi.bios.date: 12/31/2007
- dmi.bios.vendor: COMPAL
- dmi.bios.version: 1.16
- dmi.board.name: IFL90
- dmi.board.vendor: -
- dmi.board.version: IFT00
- dmi.chassis.asset.tag: -
- dmi.chassis.type: 10
- dmi.chassis.vendor: No Enclosure
- dmi.chassis.version: N/A
- dmi.modalias: 
dmi:bvnCOMPAL:bvr1.16:bd12/31/2007:svn-:pnN/A:pvrN/A:rvn-:rnIFL90:rvrIFT00:cvnNoEnclosure:ct10:cvrN/A:
- dmi.product.name: N/A
- dmi.product.version: N/A
- dmi.sys.vendor: -

-- 
the FS_IOC_FIEMAP ioctl does not report extents of small files
https://bugs.launchpad.net/bugs/474597
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