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Re: Identifying sparse files using getattrlist()
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Re: Identifying sparse files using getattrlist()



Hello All,

Please help me. Need it urgently.

Thanks

On Tue, Nov 3, 2009 at 4:34 PM, rohan a <email@hidden> wrote:
> When I use
> # mkfile -nv 4g sparse
> on a 7GB Apple_UFS partition
>
> df -k gives me this :
>
> #df -k
> Filesystem   1024-blocks Used Available Capacity  Mounted on
> /dev/disk2s3     7390568   40   7021000     1%    /Volumes/UFSVolume
>
> This indicates that the file created is sparse since it shows Capacity as 1%
>
> On Tue, Nov 3, 2009 at 4:27 PM, Alastair Houghton
> <email@hidden> wrote:
>> On 2 Nov 2009, at 13:37, rohan a wrote:
>>
>>> I am trying to identify if a particular file is a sparse file using
>>> getattrlist()
>>>
>>> I am using this :     attrList.fileattr    = ATTR_FILE_TOTALSIZE |
>>> ATTR_FILE_ALLOCSIZE;
>>>
>>> According to the man page if  ATTR_FILE_ALLOCSIZE <
>>> ATTR_FILE_TOTALSIZE the file is a sparse file.
>>>
>>> I created the sparse file using dd
>>> #dd if=/dev/zero of=sparse-file bs=1 count=0 seek=3g
>>>
>>> However, both AllocSize and TotalSize are returning the same size
>>> while actually AllocSize < TotalSize
>>>
>>> I am using UFS
>>
>> Does Apple UFS even support sparse files?  Remember, UFS is a name used by a
>> fair number of totally different and usually incompatible filesystems.  I
>> haven't really ever bothered investigating exactly what Apple's UFS can and
>> can't do... indeed, I've always had the impression that it was only really
>> present for the benefit of old-time NeXT users who might have compatible
>> filesystems floating around already.
>>
>> Kind regards,
>>
>> Alastair.
>>
>> --
>> http://alastairs-place.net
>>
>>
>>
>>
>
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References: 
 >Identifying sparse files using getattrlist() (From: rohan a <email@hidden>)
 >Re: Identifying sparse files using getattrlist() (From: Alastair Houghton <email@hidden>)
 >Re: Identifying sparse files using getattrlist() (From: rohan a <email@hidden>)



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