Re: Info needed for File System Development
Re: Info needed for File System Development
- Subject: Re: Info needed for File System Development
- From: Anton Altaparmakov <email@hidden>
- Date: Tue, 1 May 2007 09:18:28 +0100
Hi,
On 30 Apr 2007, at 23:33, John Davidorff Pell wrote:
This sounds much like you're trying to add full journaling to HFS+.
Is this a fair characterisation?
I don't think so. He is effectively describing what Leopard's Time
Machine or Legato's Networker backup solution provide (implemented
differently) so they seem to be reinventing the wheel somewhat...
I.e. you keep all changes to the file so you can go back in time to
any particular version of the file that previously existed. So for
example when you delete a file or it gets corrupt or when you simply
modify a file and don't like the changes you can then get back the
previous version(s) at will at the simple click of a button or two...
Best regards,
Anton
JP
On Apr 30, 2007, at 5:41 AM, Shailesh Parulekar wrote:
Firstly,Thanks all for extending your help.
About, need of our product:: At a very high level, I wish to
intercept the I/Os (essentially Writes) made to a set of files and
store the changes in my secondary storage so that in the event of
machine crash user should be able to reconstruct his/her files
with the help of the product. In general terminology it is
Continuous Data Protection (C.D.P.)
My intention is to track the block changes that happen to the
files and have my meta data pointing to the old (changed) blocks
so that I get to construct various versions of the files from my
meta data.
As and when plans are crystallized I will have more concrete
questions to chalk down. For now I just need to get started with
the Mac OS X Internals and think of possible avenues to meet my
requirements.
Thanks again,
--shailesh parulekar
From: Michael Smith <email@hidden>
To: Shailesh Parulekar <email@hidden>
CC: email@hidden
Subject: Re: Info needed for File System Development
Date: Sun, 29 Apr 2007 14:43:39 +0930
On Apr 26, 2007, at 6:13 PM, Shailesh Parulekar wrote:
I need to develop a Filter driver to plug-in into the MAC File
System in order to 'filter' the read/writes to the files and
process the same as per the need of our product.
What are the "needs of your product"?
= Mike
--
Anton Altaparmakov <aia21 at cam.ac.uk> (replace at with @)
Unix Support, Computing Service, University of Cambridge, CB2 3QH, UK
Linux NTFS maintainer, http://www.linux-ntfs.org/
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