site_archiver@lists.apple.com Delivered-To: darwin-dev@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:in-reply-to:references :date:message-id:subject:from:to:cc:content-type :content-transfer-encoding; bh=n48mfj4cSLA1fdl2Qxn36frQ60Hfsjlkix55JJLGyl8=; b=qHNGpRsKDk889Get76KXOewAP4C1exIEKMvysxFcRopYQQPloeu6J+5zhE+PAUIvS4 +JRKjCsAVuJQ4mMi6GW8fkFRipwzNMadFkSjq3PA6VChnrakoh6wzZDM7hYE/pvNG7jp xzbUcYaVWj++h1SyhwbTxRC3OMzufMjYXmwW0= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=qrQdsYgMLZzuy9rtBxQlBxYocA12DC4vywP9nTMYerWcNCI7dRx8XRVgIfJ88uHMzj selp4mS5waYFuGx+xpjTJ/m4t2+OfOpWaWCtie+yfvLfrjxJCJUQucz0QSqRi6DB/O+l Q1wiI4e8EGU03oaHi4a9jQopVeAcQaQ7UvjrE= Why the hard coded value 512 ? To find the real size of the file I tried this : RealSize = st_blocks * st_blksize; st_blksize returned was 4096 And the real size far execeeded the stat size (should be the opposite for sparse files) Thanks On Tue, Nov 3, 2009 at 9:25 PM, Peter O'Gorman <peter@pogma.com> wrote:

On 11/03/2009 09:35 AM, rohan a wrote:

...

Hello All,

Please help me. Need it urgently.

I think you should just be using stat(2) and comparing st_size with st_blocks*512.

But UFS seems to have gone away, so I was unable to create a UFS disk image to check.

Peter

...

Thanks

On Tue, Nov 3, 2009 at 4:34 PM, rohan a<info1686@gmail.com>  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 <alastair@alastairs-place.net>  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.

-- Peter O'Gorman http://pogma.com

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