svn commit: r364403 - head/sbin/devd

[Warner Losh]

Author: imp
Date: Wed Aug 19 17:10:09 2020
New Revision: 364403
URL: https://svnweb.freebsd.org/changeset/base/364403

Log:
  Document the VFS FS events
  
  MOUNT notifies when a filesystem is mounted
  REMOUNT notifies when a filesystem is mounted again
  UNMOUNT notifies when a filesystem is unmounted
  
  These events are asynchronous to the actual state of the event (though the data
  is recorded at a time when it is stable). The mount event is reported after the
  filesystem is mounted. However, in the interim it may be unmounted by another
  agent. Likewise, umount is called just before the mountpoint is finished tearing
  down. It may be remounted (or maybe if the process scheduling is wonky and devd
  gets to run before the last few steps are complete).
  
  Sponsored by: Netflix
  Diffential Revision: https://reviews.freebsd.org/D25969

Modified:
  head/sbin/devd/devd.conf.5

Modified: head/sbin/devd/devd.conf.5
==============================================================================
--- head/sbin/devd/devd.conf.5	Wed Aug 19 17:10:04 2020	(r364402)
+++ head/sbin/devd/devd.conf.5	Wed Aug 19 17:10:09 2020	(r364403)
@@ -573,6 +573,20 @@ USB interface is detached from a device.
 .Pp
 .Bl -column "System" "Subsystem" "1234567" -compact
 .Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
+.It Li VFS Ta Ta Ta
+Events from the vfs system.
+.It Li VFS Ta Li FS Ta Ta
+Events that change what is mounted to the system.
+.It Li VFS Ta Li FS Ta Li MOUNT Ta
+Notification of a filesystem is mounted for the first time.
+.It Li VFS Ta Li FS Ta Li REMOUNT Ta
+Notification of a filesystem is remounted (whether or not the options actually change).
+.It Li VFS Ta Li FS Ta Li UNMOUNT Ta
+Notification of a filesystem being unmounted.
+.El
+.Pp
+.Bl -column "System" "Subsystem" "1234567" -compact
+.Sy "System" Ta Sy "Subsystem" Ta Sy "Type" Ta Sy "Description"
 .It Li ZFS Ta ZFS Ta Ta
 Events about the ZFS subsystem.
 See