Solaris is open source, you can always take a look at the code to see what it does ;-)
Afshin On 05/ 5/10 10:17 AM, Edward Ned Harvey wrote:
From: Alan Wright [mailto:alan.wri...@oracle.com] Sent: Tuesday, May 04, 2010 6:28 PM Is this a curiosity question or are you trying to implement support for Previous Versions? Have you looked at the spec and/or what Windows clients do when you view Previous Versions?I don't know where to find the spec, but I am specifically interested in how zfs snapshots are translated to previous versions. If we're talking about a general spec, as implemented by MS Windows servers or anything other than ZFS, I'm not interested in that. Only interested in ZFS. The reason I'm interested is: I've begun work on something called "zhist" This is a cross-platform python script, which is meant to simplify access to snapshots. The simple and obvious thing to do is to base it on filenames. If a user does something like "zhist ls somefile" then zhist climbs up to the proper parent directory of somefile, enters the .zfs/snapshot directory, and produces a list of all the matching instances of somefile. For example: cd /tank/home/eharvey/working/foo zhist ls bar Results in: /tank/.zfs/snapshot/snap1/home/eharvey/working/foo/bar /tank/.zfs/snapshot/snap2/home/eharvey/working/foo/bar /tank/.zfs/snapshot/snap.../home/eharvey/working/foo/bar Then, somebody in zfs-discuss asked me, "what if the thing has been renamed, or moved to a different directory?" ... Well, this technique of finding object previous versions based on filename and path cannot identify renames and moves. So then there was this whole discussion about reverse lookup inode --> names. This discussion didn't really progress much. So then somebody suggested, "Hey, doesn't CIFS previous versions already do this? Why don't you ask them how they do it?" So here I am. I don't want to presume I've thought up every possible algorithm to identify previous versions of an object. So instead of asking "Hey, do you guys search by matching filename and path in the snapshots, or use reverse inode-->pathname lookup," I felt it was more appropriate to ask, "What technique is being used, to map snapshots to previous versions." So ... Can you answer the question, or tell me where to look so I can read about it? Thanks... _______________________________________________ cifs-discuss mailing list cifs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/cifs-discuss
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