Switch geom_disk over to using a pool mutex.

The GEOM disk d_mtx is only acquired on disk creation and destruction.
It is a good candidate for replacement with a pool mutex.  This eliminates
the mutex initialization and teardown and the mutex and name variables
themselves from struct disk.

sys/geom/geom_disk.h:
	Take d_mtx and d_mtx_name out of struct disk.

sys/geom/geom_disk.c:
	Use mtx_pool_lock() and mtx_pool_unlock() to guard the disk
	initialization state instead of a dedicated mutex.

	This allows removing the initialization and destruction of
	d_mtx.

sys/sys/param.h:
	Bump __FreeBSD_version to 1100119 for the change to struct disk.

Suggested by:	jhb
Sponsored by:	Spectra Logic
Approved by:	re (gjb)

1 files changed, 0 insertions, 2 deletions

diff --git a/sys/geom/geom_disk.h b/sys/geom/geom_disk.h
index 8549348..5fce5b9 100644
--- a/sys/geom/geom_disk.h
+++ b/sys/geom/geom_disk.h
@@ -72,8 +72,6 @@ struct disk {
 	struct devstat		*d_devstat;
 	int			d_goneflag;
 	int			d_destroyed;
-	struct mtx		d_mtx;
-	char			d_mtx_name[24];
 	disk_init_level		d_init_level;
 
 	/* Shared fields */