At 12:33 AM +0200 6/3/08, Kris Kennaway wrote:
Ivan Voras wrote:
Suleiman Souhlal wrote:
I have an old patch that makes kqueue monitor every file write on
the system and return the inode number in the knote's data field:
http://people.freebsd.org/~ssouhlal/testing/kqueue-anyvnode-20050503.diff
.
I'd think it shouldn't be too hard to make it per-mountpoint..
FWIW, I would love to use this. I have situations where I have huge
numbers of files and need to cheaply detect changes so I can
resynchronize them to remote machines.
I remember a discussion of changes to MacOS10 in Leopard which made
it easier to implement features such as Spotlight and TimeMachine.
The description starts here, I think:
http://arstechnica.com/reviews/os/mac-os-x-10-5.ars/7
the section on file-system events.
The idea I thought was interesting was to save the metadata on a
directory basis, instead of saving it on the file. So, if file
/some/dir/fname was changed, then they'd record that *some* file
under /some/dir has changed.
So when your userland process comes along later on, it still has to
scan all files in that directory to see which file(s) actually
changed. But that's a lot less work than scanning all files in the
filesystem, and it also means there is much less data that has to be
kept track of.
I have no idea how easy it would be to implement something similar on
FreeBSD, but the strategy seemed like a pretty neat idea.
--
Garance Alistair Drosehn = [EMAIL PROTECTED]
Senior Systems Programmer or [EMAIL PROTECTED]
Rensselaer Polytechnic Institute or [EMAIL PROTECTED]
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