November 2009 - Darwin-dev - lists.apple.com

Re: Identifying sparse files using getattrlist()
by rohan a 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)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=zyrKbwEBzX1a6aPWkJckjallmxEcTidF6Xr2pkh6sTQ=; b=ApisnBjTv9WnXJ4jXHKXWWkkh+ufdcDW9g87+HXUGmyruXfOvauKDRGtTJugGtVqwU BmTuv2VpogcUm2G1zonOIdDdjpD7l3bM4l1b7Mh6AWlj03Rr47aeZJuYlg2sl30sAS1Y jS6gurtJII8nfNxSMnsxd8H15nmHB5GAlns6o= 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=d0HCtUnHoiYbOuYEZOuuQIItwV86mYUdHSMguUVaoIc1NSuAaQvqtoZsi/UuUQchfg tiaXUIA8LP78uLxIx2sGfmD50LF2hQ2jPVJM1PVpCaiqlmt8ity0QIeqHM9VE9ujpvir vC9py0JbaCjh/5JPM/zBh0+ZNFZL0+cni4RMw= Thanks a lot :) I will try this Would st_blksize vary for every file ? Also is there any macro I can use instead of directly using 512 ? On Tue, Nov 3, 2009 at 9:42 PM, Mike Mackovitch <macko(a)apple.com> wrote: > On Tue, Nov 03, 2009 at 09:27:38PM +0530, rohan a wrote: >> 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) > > Perhaps reading the documentation would help? From the stat(2) man page: > > The size-related fields of the structures are as follows: > > st_blksize The optimal I/O block size for the file. > > st_blocks The actual number of blocks allocated for the file in > 512-byte units. [...] > > > HTH > --macko > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by Mike Mackovitch 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mutt/1.5.20 (2009-06-14) On Tue, Nov 03, 2009 at 09:27:38PM +0530, rohan a wrote: > 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) Perhaps reading the documentation would help? From the stat(2) man page: The size-related fields of the structures are as follows: st_blksize The optimal I/O block size for the file. st_blocks The actual number of blocks allocated for the file in 512-byte units. [...] HTH --macko _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by Alastair Houghton 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=alastairs-place.net; h= subject:mime-version:content-type:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; q=dns/txt; s= aug07; bh=Tt550S30oQzjXId4OoRpgNUIWkY=; b=iriya/Ssb7RyQcYifHfJWb fvCEs2UZMweErU3QOGroZjzSCZUg5IBfbbWdReHwRaPEroTvn0CfkPqYIKaPpEIA UgoiQH0c6A9xIHL7EgLn134Sj7ycM60wUkuW85QOVdKXsIyzvmm/uL+H3oPwP/n9 hymWYwz//EjAcCoFTOig8= On 3 Nov 2009, at 15:57, rohan a wrote: 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) The size-related fields of the structures are as follows: st_blksize The optimal I/O block size for the file. Kind regards, Alastair. -- http://alastairs-place.net _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… st_blksize isn't what you think. Check the stat(2) man page, where you'll see it says: st_blocks The actual number of blocks allocated for the file in 512-byte units. As short symbolic links are stored in the inode, this number may be zero. This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by rohan a 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)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(a)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(a)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(a)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 > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by Peter O'Gorman 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com User-agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.9.1.4pre) Gecko/20091014 Fedora/3.0-2.8.b4.fc11 Thunderbird/3.0b4 Hello All, Peter Thanks 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(a)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 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 _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… On 11/03/2009 09:35 AM, rohan a wrote: 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. On Tue, Nov 3, 2009 at 4:34 PM, rohan a<info1686(a)gmail.com> wrote: I am using UFS This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by Alastair Houghton 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=alastairs-place.net; h= subject:mime-version:content-type:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; q=dns/txt; s= aug07; bh=ALakRrqSi69BXnV6ddLzRbY2r1o=; b=cKbvAyBM+BNG9sfudHKz5H JDTpk4NHJko6EtnomejgO4ZZugveS65BApdZInhm0Nvg9Gmoc14Y6h32zHvu01dl UU/Cxx5ImY4WSf5RhYHi7dkvXWTNv4CvLH+Ct+GyPFCzjewv951RWqrbnoyFGKrw yHhV4+LXFj7HxJ0AvcwTc= On 3 Nov 2009, at 15:35, rohan a wrote: The sources are available here: http://opensource.apple.com/ Kind regards, Alastair. -- http://alastairs-place.net _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… Please help me. Need it urgently. Asking once is enough. People on these mailing lists are for the most part volunteering their own time and resources to help each other, and pestering because of *your* deadline is not going to endear you to them. If you need the information urgently, why not download the kernel sources and take a look yourself to see what the code actually does? That's what many of us would have to do to answer your question anyway... This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by rohan a 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)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=T2jyp3LBn3ircylS9TShx6SIwg0zOHGrA3T2RCqViHQ=; b=w8R9BKjpnJoN/CuoLSwyCJcAcUgKJhI+GVUp56QVPr6QTX5FB6gtMYRG8yAFYdHsmc 9BTdzaPJS7Abc/G/jxy/cFD3jLt4c/+rlv7M4rSyqvjFpCvRBEVn9emqKacz8odVrukF PmSu812RXNJjJ8RiD5XXQgUx12ggoISUBrjtY= 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=F+xP8gh3qzJA2x1mibyQejOnO4GX2Tm3ZFaxp2NV8jnV5CWeWMEBs4V4eZq+NUPkhg V5NvTf3csY6GOyi241isBx+/T0w9BTsL6ot3jj/emhv4f4WelfKGdRZM7hFvfGiWWLXV RvSH/CxXRGajg5XA0JLKIG94yxrcIRkkmaO9I= Hello All, Please help me. Need it urgently. Thanks On Tue, Nov 3, 2009 at 4:34 PM, rohan a <info1686(a)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(a)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. >> >> Kind regards, >> >> Alastair. >> >> -- >> http://alastairs-place.net >> >> >> >> > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by rohan a 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)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=CC00OU6h+hLtXo3nEJMDrUlHy5pjNCd7Nd4+L/STj/8=; b=g2v1tlali6dMLLpqUbe/DQsybdDFhvhmYOw7v7LAMtg3NxuPomBdjWTsbHX4mpunSX thf7dkabvejjuK8eoHzOLdCiZol0PI6qNW6l69vzlfm49W2P3/UU2xAmZK7O2yygT9vd S1/I0hGQdepSgIlDUcd5N9ubNX9zthYwwb4cE= 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=A6ArI4CN0Cx3MnTnm08x/JnIFs1eZogl+/AOYhoZJOOCmoWSpBUy9J9KHQ3n24932R Lf1RIw7UEU8gaH8sK7LfS5RQWxmzppYKratvCHi09mH2gOgv7HhuHiKqSR1REywyI1FN AWXTz58ZIRFYoapTVHnSWc1q4SQH88ikUM8Bo= 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(a)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. > > Kind regards, > > Alastair. > > -- > http://alastairs-place.net > > > > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by Alastair Houghton 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)lists.apple.com Dkim-signature: v=1; a=rsa-sha1; c=relaxed; d=alastairs-place.net; h= subject:mime-version:content-type:from:in-reply-to:date:cc: content-transfer-encoding:message-id:references:to; q=dns/txt; s= aug07; bh=yA4ktUM6Fg7ktLP1gcBZH1kkzXU=; b=oEHPlxEL/UT9rzT3cuuKkA SlJsIOQeznlpsfDi0Y/KHv7IUINj7MKSfO1Xp9dbEXJf3V1e5p7KADtLSnXvlqEZ GxoaVu/J4aFW/AXl8/iraBkXQk8JDorAU6LVPM3v1xSKt5dlrusGvcwZxkI3Bae0 7gwLiny+/LDCC50cAyrlw= 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 Kind regards, Alastair. -- http://alastairs-place.net _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… 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. This email sent to site_archiver(a)lists.apple.com

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Re: Identifying sparse files using getattrlist()
by rohan a 03 Nov '09

03 Nov '09

site_archiver(a)lists.apple.com Delivered-To: darwin-dev(a)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:content-type :content-transfer-encoding; bh=AADQG2kQu0Nk4BB6O4ujbotmxlYR8Tdp1qFuVLIqsww=; b=vhzcb9Zcl7uWJq3d7BFHdR/pUtE1pDUjAERCL3PBvuekUuRbtwaO85Yx+rJxhcD1Ig i1MKmSBF3/wid++RYfrq4be5N63pIgzMIDrXLuVHvBXFAl34nZo7Vg6hLYzweR7pfT8A vPFiNrVNguPXbN5UgVEDZ80fiGsnrMp+WwZis= 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 :content-type:content-transfer-encoding; b=aHvCAqU8f3YZ48ss8Xa60VNCnWZDmfFZ1sboeDjIlbL62McfwmUcTvhPGTAjBZU3mB 0xa+9iihuwI8PxNLIwnqWxm5eENQcGYQXTjOWKhPHBcWz6rf5WC9NyhN8g4PBDlPjuh3 5IyM8K6qctY6KakCb8yz9JWDM2AWyLgVIeSJQ= Hello All, This is the program : #include<stdio.h> #include <sys/attr.h> #include <unistd.h> #include <string.h> typedef struct FileAttributes { unsigned long length; off_t TotalSize; off_t AllocSize; }FileAttributes; int main(int argc, char *argv[]) { struct attrlist attrList; FileAttributes FileBuffer; memset(&attrList, 0, sizeof(attrList)); memset(&FileBuffer, 0, sizeof(FileBuffer)); attrList.bitmapcount = ATTR_BIT_MAP_COUNT; attrList.fileattr = ATTR_FILE_TOTALSIZE | ATTR_FILE_ALLOCSIZE; if (getattrlist(argv[1], &attrList, &FileBuffer, sizeof(FileBuffer),FSOPT_NOFOLLOW) == 0) { printf("Alloc Size = %lld\n", FileBuffer.AllocSize); printf("Total Size = %lld\n", FileBuffer.TotalSize); } return 0; } On Mon, Nov 2, 2009 at 7:07 PM, rohan a <info1686(a)gmail.com> wrote: > Hello All, > > 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 > > Thanks, > Rohan > _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-dev mailing list (Darwin-dev(a)lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-dev/site_archiver%40lists.app… This email sent to site_archiver(a)lists.apple.com

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