Messages in this thread |  | | | Date | Sun, 28 Apr 2002 04:03:56 +0100 | | From | Anton Altaparmakov <> | | Subject | Re: [prepatch] address_space-based writeback |
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At 16:53 27/04/02, Jan Harkes wrote: >On Fri, Apr 12, 2002 at 08:57:17AM +0100, Anton Altaparmakov wrote: > > Yet, this really begs the question of defining the concept of a file. I am > > quite happy with files being the io entity in ntfs. It is just that each > > file in ntfs can contain loads of different data holding attributes which > > are all worth placing in address spaces. Granted, a dummy inode could be > > setup for each of those which just means a lot of wasted ram but ntfs is > > not that important so I have to take the penalty there. But if I also need > > unique inode numbers in those dummy inodes then the overhead is becoming > > very, very high... > >You could have all additional IO streams use the same inode number and >use iget4. Several inodes can have the same i_ino and the additional >argument would be a stream identifier that selects the correct 'IO >identity'.
Great idea! I quickly looked into the implementation details and using iget4/read_inode2 perfectly reconciles my ideas of using an address space mapping for each ntfs attribute with the kernels requirement of using inodes as the i/o entity by allowing a clean and unique mapping between multiple inodes with the same inode numbers and their attributes and address spaces.
I need to work out exactly how to do it but I will definitely go that way. That will make everything nice and clean and get rid of the existing kludges of passing around other types of objects instead of struct file * to my various readpage functions. Also I will be able to have fewer readpage functions... (-:
Thanks for the suggestion!
Best regards,
Anton
-- "I've not lost my mind. It's backed up on tape somewhere." - Unknown -- Anton Altaparmakov <aia21 at cantab.net> (replace at with @) Linux NTFS Maintainer / IRC: #ntfs on irc.openprojects.net WWW: http://linux-ntfs.sf.net/ & http://www-stu.christs.cam.ac.uk/~aia21/
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