7614 zfs device evacuation/removal

Reviewed by: Alex Reece <alex@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: Richard Laager <rlaager@wiktel.com>
Reviewed by: Tim Chase <tim@chase2k.com>
Approved by: Garrett D'Amore <garrett@damore.org>

usr/src/cmd/mdb/common/modules/zfs/zfs.c

@@ -421,6 +421,23 @@ zfs_params(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
 	return (DCMD_OK);
 }
 
+/* ARGSUSED */
+static int
+dva(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
+{
+	dva_t dva;
+	if (mdb_vread(&dva, sizeof (dva_t), addr) == -1) {
+		mdb_warn("failed to read dva_t");
+		return (DCMD_ERR);
+	}
+	mdb_printf("<%llu:%llx:%llx>\n",
+	    (u_longlong_t)DVA_GET_VDEV(&dva),
+	    (u_longlong_t)DVA_GET_OFFSET(&dva),
+	    (u_longlong_t)DVA_GET_ASIZE(&dva));
+
+	return (DCMD_OK);
+}
+
 /* ARGSUSED */
 static int
 blkptr(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
@@ -2055,10 +2072,12 @@ spa_space(uintptr_t addr, uint_t flags, int argc, const mdb_arg_t *argv)
 	    sd.ms_freeingtree >> shift, suffix);
 	mdb_printf("ms_freedtree = %llu%s\n",
 	    sd.ms_freedtree >> shift, suffix);
-	mdb_printf("ms_tree = %llu%s\n", sd.ms_tree >> shift, suffix);
+	mdb_printf("ms_tree = %llu%s\n",
+	    sd.ms_tree >> shift, suffix);
 	mdb_printf("ms_deferspace = %llu%s\n",
 	    sd.ms_deferspace >> shift, suffix);
-	mdb_printf("last synced avail = %llu%s\n", sd.avail >> shift, suffix);
+	mdb_printf("last synced avail = %llu%s\n",
+	    sd.avail >> shift, suffix);
 	mdb_printf("current syncing avail = %llu%s\n",
 	    sd.nowavail >> shift, suffix);
 
@@ -3916,6 +3935,7 @@ arc_compression_stats(uintptr_t addr, uint_t flags, int argc,
 static const mdb_dcmd_t dcmds[] = {
 	{ "arc", "[-bkmg]", "print ARC variables", arc_print },
 	{ "blkptr", ":", "print blkptr_t", blkptr },
+	{ "dva", ":", "print dva_t", dva },
 	{ "dbuf", ":", "print dmu_buf_impl_t", dbuf },
 	{ "dbuf_stats", ":", "dbuf stats", dbuf_stats },
 	{ "dbufs",

usr/src/cmd/truss/codes.c

@@ -1274,6 +1274,8 @@ const struct ioc {
 		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_CLONE,		"ZFS_IOC_CLONE",
 		"zfs_cmd_t" },
+	{ (uint_t)ZFS_IOC_REMAP,		"ZFS_IOC_REMAP",
+		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_BOOKMARK,		"ZFS_IOC_BOOKMARK",
 		"zfs_cmd_t" },
 	{ (uint_t)ZFS_IOC_GET_BOOKMARKS,	"ZFS_IOC_GET_BOOKMARKS",