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From: Anton A. <ai...@ca...> - 2004-02-26 13:35:47
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On Thu, 2004-02-26 at 12:58, nag talekar wrote: > i am doing a project on NTFS volume. Cool. I am CC:-ing the ntfs list. > Theres a problem. > > In $INDEX_ALLOCATION (0xA0h) attribute of system32 > folder VCN range is mentioned as 0 to 45h > > but when i count the no of clusters in datarun > entries it comes to around 117 (decimal).I think its > ok as Windows can allocate extra clusters. > > Problem arises when i access the Index records using > data runs. > > I mean first 5 data runs point to valid Index records. > Then onwards dataruns point to certain clusters which > do not contain valid Index records > > I used the docs at the site > > http://linux-ntfs.sourceforge.net/ > > could u please tell me how to locate dataruns that > point to valid Index records?? > > Is there way to map VCN to LCN values ?? > > even $BITMAP (0xB0) in that file reocrd for system32 > folder shows that first 46h Index entries (VCNs) are > occupied > > ie > FF FF FF FF .... 3F (totals to 46h VCNs) > > > i am not following B+ tree structure .I am just using > dataruns to sequentially goto the Index records. > > could please help me ?? Are you perhaps forgetting to apply the multi sector transfer fixups? Also why do you not use the ntfs library for your accesses? See http://linux-ntfs.sourceforge.net/downloads.html Unpack it and look in include/*.h and libntfs/*.c for the library and associated header files and in ntfsprogs/*.c for the utilities where you can see how to call the library. In the library you will see how to map VCNs to LCNs, too. Have a look and feel free to come back with questions... Best regards, Anton -- Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @) Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/ |
