On May 28, 2008, at 7:46 AM, Oliver Fromme wrote:
Ivan Voras wrote:
Im thinking again of the old idea of implementing poor man's file
replication system using kqueue to monitor changes on files.
It would be cool to have a kernel interface so you could
attach to a mountpoint and receive a log of all activity
on that file system. That's similar to what DragonFly's
journaling feature does.
Unfortunately the kqueue interface isn't capable of doing
something like that ... So this is not an answer to your
question, I'm afraid.
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..
While at it, will EVFILT_VNODE and NOTE_WRITE catch "additional" ways
the file can be modified, meaning mmap()?
I think it does, although it will get delayed until the mmapped pages
get flushed to disk.
-- Suleiman
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