Hi Jean-Pierre,
On Mon, 24 Sep 2007, [ISO-8859-1] Jean-Pierre Andr� wrote:
> Could you spare some time on the following problems :
Sure. And I'm very sorry I still didn't answer your previous email (if all
the issues were trivial then I would have done it long ago ;-)
> 1) appending data to $Secure/$SDS (a sparse file).
I have never seen $Secure/$SDS being sparse. This doesn't sound good but it
could be possible and things should still work.
> Basically, what I do is
> - increase the stream size (ntfs_attr_truncate())
> - write at desired location (ntfs_attr_pwrite())
You could do it simpler (safer) like it's in ntfs_fuse_write() with the
offset set to the end of the file.
> The result is roughly as desired, by chkdsk complains :
> - bad record in a sparse file
I would need the full chkdsk log (it's ok in French):
http://en.wikipedia.org/wiki/Chkdsk#Viewing_results
When you make changes to the NTFS volume then run chkdsk beforehand because
the Windows NTFS driver sometimes leaves problems behind which you could
think it's your fault but in fact it isn't.
> - free space marked in use in MFT bitmap
You can safely ignore this. This is also a Microsoft bug:
http://ntfs-3g.org/support.html#usedfreespace
> Notes :
> - chkdsk does not delete useful data in $SDS
> - initialized_size is not modified, whereas Windows
> sets it similar to data_size, but that could be not meaningful
> and chkdsk does not fix it anyway.
>
> 2) getting the next key in an index
Which one do you need: the index by hash or Security ID?
> This is needed when checking for collision in index hashes.
> The real problem here is to build a significant multilevel
> index tree, as with security descriptors it is quite difficult
> to generate more than a couple of index nodes.
> I will possibly have to create a test configuration with
> directories, unless the desired code is available somewhere
> and tested....
Unfortunately I didn't have time to do it yet and it may not be very
trivial. I guess this is urgent for you, right?
Btw, could you test if the read-only file creation works now?
Thanks!
Szaka
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