DragonFlyBSD

Looks good to me.

On Fri, Apr 29, 2016 at 10:20 PM,
<bugtracker-admin@leaf.dragonflybsd.org> wrote:

Issue #2905 has been reported by tkusumi.

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Submit #2905: Add EVFILT_FS
http://bugs.dragonflybsd.org/issues/2905

• Author: tkusumi
• Status: New
• Priority: Normal
• Assignee:
• Category:
• Target version:
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  Matt (or Sephe),

I'd like to add EVFILT_FS type to kqueue events.
autoumountd which is a userspace daemon of autofs needs this.

EVFILT_FS has existed in FreeBSD since 2004.
EVFILT_FS is triggered only when mounting or unmounting a filesystem.
(FreeBSD later added some NFS events in addition to mount/unmount, but this commit doesn't apply those)

The patch needs to be reviewed as I've only read kern/kern_event.c today to briefly understand the mechanism.

https://leaf.dragonflybsd.org/~tkusumi/diff/0001-sys-kern-Add-EVFILT_FS.patch

sample userspace code
https://leaf.dragonflybsd.org/~tkusumi/diff/kqueue1.c

--
[root@]~# gcc -Wall -g ./kqueue1.c -o ./kqueue1
[root@]~# ./kqueue1
timeout
timeout
timeout
timeout
timeout
timeout
filesystem event filter=-10 mount
timeout
timeout
filesystem event filter=-10 unmount
timeout
timeout
filesystem event filter=-10 mount
filesystem event filter=-10 unmount
timeout
timeout
timeout
^C

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Tomorrow Will Never Die

Sephe, thanks for your review.
I'll commit this soon if there is no objection.