Hello,
reading the manpage of automount, I would like to change the section in the
manpage about how the daemon reacts on signals.
It is now:
If the automount daemon catches a USR1 signal, it will umount all
currently unused autofs managed mounted file systems and continue running
(forced expire). If it catches the TERM signal it will umount all
unused autofs managed mounted file systems and exit if there are no
remaining
busy file systems. If autofs has been compiled with the option to
ignore busy mounts on exit it will exit leaving any busy mounts in place
other-
wise busy file systems will not be umounted and autofs will not exit.
Alternatively, if autofs has been compiled with the option to enable forced
shutdown then a USR2 signal to the daemon will cause all mounts to be
umounted and any busy mounts to be forcibly umounted, including autofs mount
point directories (summary execution). Note that the forced umount is
an unlink operation and the actual umount will not happen in the kernel un-
til active file handles are released. The daemon also responds to a
HUP signal which triggers an update of the maps for each mount point.
If any autofs mount point directories are busy when the daemon is sent
an exit signal the daemon will not exit. The exception to this is if autofs
has been built with configure options to either ignore busy mounts at
exit or force umount at exit. If the ignore busy mounts at exit option is
used the filesystems will be left in a catatonic (non-functional)
state and can be manually umounted when they become unused. If the force
umount
at exit option is used the filesystems will be umounted but the mount
will not be released by the kernel until they are no longer in use by the
processes that held them busy. If automount managed filesystems are
found mounted when autofs is started they will be recoverd unless they are no
longer present in the map in which case they need to umounted manually.
I would like to suggest:
The automount daemon can react on a few signals. Some of them are standard,
others are less standard and/or need compiletime options.
TERM
If it catches the TERM signal it will umount all unused autofs managed mounted
filesystems, and exit if there are no remaining mounts left. It will keep on
running (till??)
If compiled with the "ignore busy mounts" option, it will exit here, and leave
any mountpoint in place.
USR2
This only applies when the automounter is compiled with the "enable forced
shudown". When it catches the USR2, it will umount all mounts, busy or not.
Note: umounting a busy mountpoint is actually an unlink operation. The actual
umount will be done later, when all active file handleds are released. (this
id done by??)
USR1
With the USR1 signal it will umount all currently unused mounts, and continue
running (forced expire).
HUP
This signal triggers an update of the maps for each mountpoint.
I've left out some parts, but mostly rearranged the information. I've left
out the text "summary execution" Is it important?
But what do you think. Is it better this way?
Stef Bon
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