Bug 33729 - ext2fs does not actually allocate space in this particular scenerio
ext2fs does not actually allocate space in this particular scenerio
Product: Red Hat Linux
Classification: Retired
Component: e2fsprogs (Show other bugs)
i686 Linux
high Severity high
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Assigned To: Florian La Roche
Aaron Brown
Depends On:
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Reported: 2001-03-28 20:47 EST by Vaibhav A Nalawade
Modified: 2005-10-31 17:00 EST (History)
0 users

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Doc Type: Bug Fix
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Last Closed: 2001-03-28 20:47:34 EST
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Description Vaibhav A Nalawade 2001-03-28 20:47:30 EST
From Bugzilla Helper:
User-Agent: Mozilla/4.73 [en] (Windows NT 5.0; U)

Hi ,

    This is in reference to bug 29991. 
    In a program  open a file and jump to 2GB offset and insert a character  at that offset 
    and close the file. The ls -l command shows the file size to be 2GB but df -k command does not 
    show any change in the disk space allocation.In other words the space is not actually allocated. 

Reproducible: Always
Steps to Reproduce:
1.In a program open a file
2.Jump to 2GB offset and try writing a character to the file
3.Close the file

Actual Results:  ls -l command shows the file size to be 2GB.
df -k however does not show that 2GB file size is allocated.

Expected Results:  
Question : 1)  How do I allocate 2GB of file size without actually writing 2GB of data to the file ? 
                2)  Do we have some file system tunning parameter so that when ever we jump to 2GB offset and write
                    a character - 2GB size file get allocated on the disk ?
                3)  The file system is trying to do some sort of optimization. I want to turn off this optimization. This is required
                     for database use.    . 

Vaibhav Nalawade
Comment 1 Florian La Roche 2001-04-06 17:01:15 EDT
the filesystem is smart and creates "holes" if you seek beyond the end of the

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