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From: Anton A. <ai...@ca...> - 2002-12-28 22:44:42
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Hi all, As of today, we have a working ntfstruncate utility! (It can only resize downwards and only non-encrypted, non-compressed attributes in inodes that do not contain attribute lists but its a good start IMO!) To build it ./configure and make as usual and then cd ntfsprogs and make ntfstruncate, i.e. it is not built by default. Note all the functionality is in the library, see the ChangeLog for details and the sources for the functions and descriptions of how to use it. Basically you ntfs_mount() a volume, then you open the inode you want to be truncating using ntfs_inode_open(), then you open the attribute you want to truncate using ntfs_attr_open(), and now you can call ntfs_attr_truncate() which will do everything for you. (-: To cleanup, ntfs_attr_close(), ntfs_inode_close() and ntfs_umount() and all is done. Have fun! Comments on the API, internals, etc, welcome. Also most welcome are contributions to extend the functions (there are plenty of TODOs and FIXMEs in there!) so they can work on inodes with attribute lists, so they convert a zero length non-resident attribute to a resident one, so they work to enlarge attributes by adding sparse runs, too, etc... I have pretty much run out of spare time for the next two weeks so you can be sure not to tread on my toes for the time being if you want to contribute code... (-; Only one note, please leave the ntfs_cluster_alloc() as well as the in future required ntfs_mft_record_alloc() to me as I have those written already for the old ntfs driver and I just need to port them and adapt them to the library and we will have fully functional allocators for both. (Note the allocators are quite complex as they properly obbey the MFT zone and the resulting DATA zones which makes them good allocators -- at least as far as good is defined as being close to what windows does -- so there is no point in anyone else spending time to reinvent the wheel). Merry Christmas and a Happy New Year! Anton -- Anton Altaparmakov <aia21 at cantab.net> (replace at with @) Linux NTFS maintainer / IRC: #ntfs on irc.freenode.net WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/ |
