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Add comment explaining one of the quirks in autofs.

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MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Edward Tomasz Napierala 2014-08-23 11:38:31 +00:00
parent 5407523fe5
commit a32ba4e63e
1 changed files with 8 additions and 0 deletions
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8
sys/fs/autofs/autofs.c
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@ -595,6 +595,14 @@ autofs_open(struct cdev *dev, int flags, int fmt, struct thread *td)
{
sx_xlock(&sc->sc_lock);
/*
* We must never block automountd(8) and its descendants, and we use
* session ID to determine that: we store session id of the process
* that opened the device, and then compare it with session ids
* of triggering processes. This means running a second automountd(8)
* instance would break the previous one. The check below prevents
* it from happening.
*/
if (sc->sc_dev_opened) {
sx_xunlock(&sc->sc_lock);
return (EBUSY);