MFV r254750:

Add support of Illumos dumps on zvol over RAID-Z.

Note that this only adds the features.  FreeBSD would
still need more work to support dumping on zvols.

Illumos ZFS issues:
  2932 support crash dumps to raidz, etc. pools

MFC after:	1 month
Approved by:	re (ZFS blanket)

1 files changed, 25 insertions, 3 deletions

diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c
index 00682c89cab7..3d119661c1a2 100644
--- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c
+++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev_disk.c
@@ -22,6 +22,7 @@
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright (c) 2013 by Delphix. All rights reserved.
  * Copyright 2013 Nexenta Systems, Inc.  All rights reserved.
+ * Copyright 2013 Joyent, Inc.  All rights reserved.
  */
 
 #include <sys/zfs_context.h>
@@ -431,8 +432,29 @@ vdev_disk_close(vdev_t *vd)
 }
 
 int
-vdev_disk_physio(ldi_handle_t vd_lh, caddr_t data, size_t size,
-    uint64_t offset, int flags)
+vdev_disk_physio(vdev_t *vd, caddr_t data,
+    size_t size, uint64_t offset, int flags, boolean_t isdump)
+{
+	vdev_disk_t *dvd = vd->vdev_tsd;
+
+	ASSERT(vd->vdev_ops == &vdev_disk_ops);
+
+	/*
+	 * If in the context of an active crash dump, use the ldi_dump(9F)
+	 * call instead of ldi_strategy(9F) as usual.
+	 */
+	if (isdump) {
+		ASSERT3P(dvd, !=, NULL);
+		return (ldi_dump(dvd->vd_lh, data, lbtodb(offset),
+		    lbtodb(size)));
+	}
+
+	return (vdev_disk_ldi_physio(dvd->vd_lh, data, size, offset, flags));
+}
+
+int
+vdev_disk_ldi_physio(ldi_handle_t vd_lh, caddr_t data,
+    size_t size, uint64_t offset, int flags)
 {
 	buf_t *bp;
 	int error = 0;
@@ -680,7 +702,7 @@ vdev_disk_read_rootlabel(char *devpath, char *devid, nvlist_t **config)
 
 		/* read vdev label */
 		offset = vdev_label_offset(size, l, 0);
-		if (vdev_disk_physio(vd_lh, (caddr_t)label,
+		if (vdev_disk_ldi_physio(vd_lh, (caddr_t)label,
 		    VDEV_SKIP_SIZE + VDEV_PHYS_SIZE, offset, B_READ) != 0)
 			continue;