site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Domainkey-signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com; h=received:message-id:date:from:reply-to:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references; b=o4631aqrDGoxgweEnP5s3mvrrWZlAqUxL8PixGVOkW7pfTZG3ru4Fp0tMPV5u2HpkZ8UBWa7eQG4o4QpVIrOCFyO9pbpVu4D13bfhLOObfjbJxWsmHkARlA5MdnvJbgZBySGWypfj7iU3BOT11AEMe1JCCJxSCN/h69fB1uW+ws= hi mike If i keep the handle of the file open then i don't think that filesystem will try to recycle the blocks corresponding to file as long as the handle is open According to http://developer.apple.com/technotes/tn/tn1150.html , the catalog file stores the first 8 extents: HFS Plus maintains information about the contents of a file using the HFSPlusForkData structure. Two such structures -- one for the resource and one for the data fork -- are stored in the catalog record for each user file. In addition, the volume header contains a fork data structure for each special file. Do anyone have any idea of how to obtain the catalog record corresponding to file? what are the api's or function to obtain this. thanks santosh k On 7/21/05, santosh katvate <santosh.nk@gmail.com> wrote:

hi mike

If i keep the handle of the file open then i don't think that filesystem will try to recycle the blocks corresponding to file as long as the handle is open

According to http://developer.apple.com/technotes/tn/tn1150.html , the catalog file stores the first 8 extents: HFS Plus maintains information about the contents of a file using the HFSPlusForkData structure. Two such structures -- one for the resource and one for the data fork -- are stored in the catalog record for each user file. In addition, the volume header contains a fork data structure for each special file.

Do anyone have any idea of how to obtain the catalog record corresponding to file? what are the api's or function to obtain this.

thanks santosh k

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