- Move 'struct swdevt' back into swap_pager.h and expose it to userland.

- Restore support for fetching swap information from crash dumps via
  kvm_get_swapinfo(3) to fix pstat -T/-s on crash dumps.

Reviewed by:	arch@, phk
MFC after:	1 week

1 files changed, 32 insertions, 0 deletions

diff --git a/sys/vm/swap_pager.h b/sys/vm/swap_pager.h
index a254cc7..c3366e8 100644
--- a/sys/vm/swap_pager.h
+++ b/sys/vm/swap_pager.h
@@ -38,6 +38,38 @@
 #ifndef	_VM_SWAP_PAGER_H_
 #define	_VM_SWAP_PAGER_H_ 1
 
+typedef	int32_t	swblk_t;	/*
+				 * swap offset.  This is the type used to
+				 * address the "virtual swap device" and
+				 * therefore the maximum swap space is
+				 * 2^32 pages.
+				 */
+
+struct buf;
+struct swdevt;
+typedef void sw_strategy_t(struct buf *, struct swdevt *);
+typedef void sw_close_t(struct thread *, struct swdevt *);
+
+/*
+ * Swap device table
+ */
+struct swdevt {
+	int	sw_flags;
+	int	sw_nblks;
+	int     sw_used;
+	dev_t	sw_dev;
+	struct vnode *sw_vp;
+	void	*sw_id;
+	swblk_t	sw_first;
+	swblk_t	sw_end;
+	struct blist *sw_blist;
+	TAILQ_ENTRY(swdevt)	sw_list;
+	sw_strategy_t		*sw_strategy;
+	sw_close_t		*sw_close;
+};
+
+#define	SW_CLOSING	0x04
+
 #ifdef _KERNEL
 
 extern int swap_pager_full;