Re: remote mirroring in the works?

[Goffredo Baroncelli <kreijack@gmail.com>]

On Tuesday, 31 August, 2010, Simon Kirby wrote:
[...]
> Anyway, there _is_ this interface:
> 
> 	btrfs subvolume find-new <path> <last_gen>
> 		List the recently modified files in a filesystem.
> 
> Eg:
> 
> 	btrfs sub find-new /mnt 0
> 
> This should print all files on the file system, and the last transaction
> ID marker.  This can be used to call the interface again, which lists
> only new changed things since that ID.
  ^^^^

It is not fully correct. In fact Chris Mason says

(from http://www.mail-archive.com/linux-btrfs@vger.kernel.org/msg04620.html)


Chris> When we find an inode in the output, it doesn't mean that inode has
Chris> changed.  It just means the btree block holding that inode has 
changed.
Chris> So we'll want to add limiting based on the ctime/mtime of the inode as
Chris> well.

So even tough this command definitely helps, false positives may happen. 
And moreover an empty file is not detected (I think because the file doesn't 
have associated data). But I think that this may be easily corrected.

Regards
G.Baroncelli

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