svn commit: r185693 - head/sys/geom/journal

[Edward Tomasz Napierala]

Author: trasz
Date: Sat Dec  6 11:33:10 2008
New Revision: 185693
URL: http://svn.freebsd.org/changeset/base/185693

Log:
  Make it possible to use gjournal for the root filesystem.  Previously,
  an unclean shutdown would make it impossible to mount rootfs at boot.
  
  PR:		kern/128529
  Reviewed by:	pjd
  Approved by:	rwatson (mentor)
  Sponsored by:	FreeBSD Foundation

Modified:
  head/sys/geom/journal/g_journal.c
  head/sys/geom/journal/g_journal.h

Modified: head/sys/geom/journal/g_journal.c
==============================================================================
--- head/sys/geom/journal/g_journal.c	Sat Dec  6 11:21:10 2008	(r185692)
+++ head/sys/geom/journal/g_journal.c	Sat Dec  6 11:33:10 2008	(r185693)
@@ -2108,6 +2108,12 @@ g_journal_worker(void *arg)
 	g_topology_unlock();
 	last_write = time_second;
 
+	if (sc->sc_rootmount != NULL) {
+		GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount);
+		root_mount_rel(sc->sc_rootmount);
+		sc->sc_rootmount = NULL;
+	}
+
 	for (;;) {
 		/* Get first request from the queue. */
 		mtx_lock(&sc->sc_mtx);
@@ -2304,6 +2310,9 @@ g_journal_create(struct g_class *mp, str
 		sc->sc_inactive.jj_queue = NULL;
 		sc->sc_active.jj_queue = NULL;
 
+		sc->sc_rootmount = root_mount_hold("GJOURNAL");
+		GJ_DEBUG(1, "root_mount_hold %p", sc->sc_rootmount);
+
 		callout_init(&sc->sc_callout, CALLOUT_MPSAFE);
 		if (md->md_type != GJ_TYPE_COMPLETE) {
 			/*
@@ -2434,6 +2443,13 @@ g_journal_destroy(struct g_journal_softc
 	sc->sc_flags |= (GJF_DEVICE_DESTROY | GJF_DEVICE_CLEAN);
 
 	g_topology_unlock();
+
+	if (sc->sc_rootmount != NULL) {
+		GJ_DEBUG(1, "root_mount_rel %p", sc->sc_rootmount);
+		root_mount_rel(sc->sc_rootmount);
+		sc->sc_rootmount = NULL;
+	}
+
 	callout_drain(&sc->sc_callout);
 	mtx_lock(&sc->sc_mtx);
 	wakeup(sc);

Modified: head/sys/geom/journal/g_journal.h
==============================================================================
--- head/sys/geom/journal/g_journal.h	Sat Dec  6 11:21:10 2008	(r185692)
+++ head/sys/geom/journal/g_journal.h	Sat Dec  6 11:33:10 2008	(r185693)
@@ -163,6 +163,8 @@ struct g_journal_softc {
 
 	struct callout	 sc_callout;
 	struct proc	*sc_worker;
+
+	struct root_hold_token *sc_rootmount;
 };
 #define	sc_dprovider	sc_dconsumer->provider
 #define	sc_jprovider	sc_jconsumer->provider