svn commit: r238216 - head/sys/geom

[Edward Tomasz Napierala]

Author: trasz
Date: Sat Jul  7 21:28:31 2012
New Revision: 238216
URL: http://svn.freebsd.org/changeset/base/238216

Log:
  Add disk_resize(), to make it possible for the disk drivers such as da(4)
  to notify GEOM about LUN size change.
  
  Reviewed by:	mav (earlier version)
  Sponsored by:	FreeBSD Foundation

Modified:
  head/sys/geom/geom_disk.c
  head/sys/geom/geom_disk.h

Modified: head/sys/geom/geom_disk.c
==============================================================================
--- head/sys/geom/geom_disk.c	Sat Jul  7 20:32:21 2012	(r238215)
+++ head/sys/geom/geom_disk.c	Sat Jul  7 21:28:31 2012	(r238216)
@@ -48,6 +48,7 @@ __FBSDID("$FreeBSD$");
 #include <sys/malloc.h>
 #include <sys/sbuf.h>
 #include <sys/sysctl.h>
+#include <sys/taskqueue.h>
 #include <sys/devicestat.h>
 #include <machine/md_var.h>
 
@@ -65,6 +66,7 @@ struct g_disk_softc {
 	struct sysctl_oid	*sysctl_tree;
 	char			led[64];
 	uint32_t		state;
+	struct task		resize_task;
 };
 
 static struct mtx g_disk_done_mtx;
@@ -445,6 +447,27 @@ g_disk_dumpconf(struct sbuf *sb, const c
 }
 
 static void
+g_disk_resize_task(void *context, int pending)
+{
+	struct g_geom *gp;
+	struct g_provider *pp;
+	struct disk *dp;
+	struct g_disk_softc *sc;
+
+	sc = (struct g_disk_softc *)context;
+	dp = sc->dp;
+	gp = dp->d_geom;
+
+	LIST_FOREACH(pp, &gp->provider, provider) {
+		if (pp->sectorsize != 0 &&
+		    pp->sectorsize != dp->d_sectorsize)
+			g_wither_provider(pp, ENXIO);
+		else
+			g_resize_provider(pp, dp->d_mediasize);
+	}
+}
+
+static void
 g_disk_create(void *arg, int flag)
 {
 	struct g_geom *gp;
@@ -484,6 +507,7 @@ g_disk_create(void *arg, int flag)
 		    CTLFLAG_RW | CTLFLAG_TUN, sc->led, sizeof(sc->led),
 		    "LED name");
 	}
+	TASK_INIT(&sc->resize_task, 0, g_disk_resize_task, sc);
 	pp->private = sc;
 	dp->d_geom = gp;
 	g_error_provider(pp, 0);
@@ -635,6 +659,24 @@ disk_attr_changed(struct disk *dp, const
 			(void)g_attr_changed(pp, attr, flag);
 }
 
+void
+disk_resize(struct disk *dp)
+{
+	struct g_geom *gp;
+	struct g_disk_softc *sc;
+	int error;
+
+	gp = dp->d_geom;
+
+	if (gp == NULL)
+		return;
+
+	sc = gp->softc;
+
+	error = taskqueue_enqueue(taskqueue_thread, &sc->resize_task);
+	KASSERT(error == 0, ("taskqueue_enqueue(9) failed."));
+}
+
 static void
 g_kern_disks(void *p, int flag __unused)
 {

Modified: head/sys/geom/geom_disk.h
==============================================================================
--- head/sys/geom/geom_disk.h	Sat Jul  7 20:32:21 2012	(r238215)
+++ head/sys/geom/geom_disk.h	Sat Jul  7 21:28:31 2012	(r238216)
@@ -109,6 +109,7 @@ void disk_create(struct disk *disk, int 
 void disk_destroy(struct disk *disk);
 void disk_gone(struct disk *disk);
 void disk_attr_changed(struct disk *dp, const char *attr, int flag);
+void disk_resize(struct disk *dp);
 
 #define DISK_VERSION_00		0x58561059
 #define DISK_VERSION_01		0x5856105a