https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240874
Mark Johnston <ma...@freebsd.org> changed:
What |Removed |Added
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CC| |ma...@freebsd.org
Status|In Progress |Open
--- Comment #14 from Mark Johnston <ma...@freebsd.org> ---
FWIW I have been working on a native inotify implementation. It works well
enough to run test programs, there is still a fair bit of integration left to
do, and there are some compatibility issues involving the name cache which will
be hard to fully fix.
There are some fundamental race conditions in EVFILT_VNODE which make it
unusable for some purposes, so building inotify on top of kevent(EVFILT_VNODE)
doesn't really help me, hence the native implementation. For example, suppose
some service creates files in a directory, and I want a notification when that
service is done with a file. With inotify, I can track the directory with
IN_CLOSE. With EVFILT_VNODE, I need to 1) watch the directory for writes, 2)
when a write occurs, scan the directory to find new files, 3) open new files
and wait for NOTE_CLOSE. But if the service closes the file before step 3, I
miss the notification. I do not see how this can be solved without a new
notification interface.
Originally I implemented a new kqueue filter, EVFILT_FSWATCH, which gives
notifications for all filesystem, kind of like MacOS' fsevents. But I think it
is probably more useful to have a Linux-compatible inotify instead, so I will
go ahead with that.
I would like to integrate this into the linuxulator, if only so that I can run
the LTP inotify test programs. If anyone has done this recently and can
describe the steps, I'd greatly appreciate it; I've found devel/linux-ltp, but
it fails to fetch.
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