* compare COW files
@ 2008-10-21 3:25 calin
2008-10-21 5:40 ` Joshua J. Berry
2008-10-21 5:59 ` Yan Zheng
0 siblings, 2 replies; 3+ messages in thread
From: calin @ 2008-10-21 3:25 UTC (permalink / raw)
To: linux-btrfs
If I make a cow copy of a file, is there a way find out whether either copy has changed? Specifically, I'm looking for a way to figure out which files have changed since a snapshot was taken, short of traditional and time-consuming file comparisons. It could have some interesting possibilities for monitoring and backup, to be able to quickly compare against a reference snapshot to find changes.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: compare COW files
2008-10-21 3:25 compare COW files calin
@ 2008-10-21 5:40 ` Joshua J. Berry
2008-10-21 5:59 ` Yan Zheng
1 sibling, 0 replies; 3+ messages in thread
From: Joshua J. Berry @ 2008-10-21 5:40 UTC (permalink / raw)
To: calin; +Cc: linux-btrfs
On Monday 20 October 2008 20:25:52 calin wrote:
> If I make a cow copy of a file, is there a way find out whether either copy
> has changed? Specifically, I'm looking for a way to figure out which files
> have changed since a snapshot was taken, short of traditional and
> time-consuming file comparisons. It could have some interesting
> possibilities for monitoring and backup, to be able to quickly compare
> against a reference snapshot to find changes. --
> To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
I'm also very interested in this, for incremental backups. I use rdiff-backup
currently, and being able to do this would likely give an impressive speed
boost.
-- Josh
--
Joshua J. Berry
"I haven't lost my mind -- it's backed up on tape somewhere."
-- /usr/games/fortune
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: compare COW files
2008-10-21 3:25 compare COW files calin
2008-10-21 5:40 ` Joshua J. Berry
@ 2008-10-21 5:59 ` Yan Zheng
1 sibling, 0 replies; 3+ messages in thread
From: Yan Zheng @ 2008-10-21 5:59 UTC (permalink / raw)
To: calin, des; +Cc: linux-btrfs
2008/10/21 calin <calin@splitreflection.com>:
> If I make a cow copy of a file, is there a way find out whether either copy has changed? Specifically, I'm looking for a way to figure out which files have changed since a snapshot was taken, short of traditional and time-consuming file comparisons. It could have some interesting possibilities for monitoring and backup, to be able to quickly compare against a reference snapshot to find changes.
Btrfs disk format already supports this. We will implement this in the
near future.
Regards
Yan Zheng
^ permalink raw reply [flat|nested] 3+ messages in thread
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2008-10-21 3:25 compare COW files calin
2008-10-21 5:40 ` Joshua J. Berry
2008-10-21 5:59 ` Yan Zheng
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