1 files changed, 252 insertions, 0 deletions
diff --git a/cmd/zpool/zpool_iter.c b/cmd/zpool/zpool_iter.c
new file mode 100644
index 000000000..2f0daefd5
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+++ b/cmd/zpool/zpool_iter.c
@@ -0,0 +1,252 @@
+/*
+ * CDDL HEADER START
+ *
+ * The contents of this file are subject to the terms of the
+ * Common Development and Distribution License (the "License").
+ * You may not use this file except in compliance with the License.
+ *
+ * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
+ * or http://www.opensolaris.org/os/licensing.
+ * See the License for the specific language governing permissions
+ * and limitations under the License.
+ *
+ * When distributing Covered Code, include this CDDL HEADER in each
+ * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
+ * If applicable, add the following below this CDDL HEADER, with the
+ * fields enclosed by brackets "[]" replaced with your own identifying
+ * information: Portions Copyright [yyyy] [name of copyright owner]
+ *
+ * CDDL HEADER END
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#pragma ident	"%Z%%M%	%I%	%E% SMI"
+
+#include <libintl.h>
+#include <libuutil.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <strings.h>
+
+#include <libzfs.h>
+
+#include "zpool_util.h"
+
+/*
+ * Private interface for iterating over pools specified on the command line.
+ * Most consumers will call for_each_pool, but in order to support iostat, we
+ * allow fined grained control through the zpool_list_t interface.
+ */
+
+typedef struct zpool_node {
+	zpool_handle_t	*zn_handle;
+	uu_avl_node_t	zn_avlnode;
+	int		zn_mark;
+} zpool_node_t;
+
+struct zpool_list {
+	boolean_t	zl_findall;
+	uu_avl_t	*zl_avl;
+	uu_avl_pool_t	*zl_pool;
+	zprop_list_t	**zl_proplist;
+};
+
+/* ARGSUSED */
+static int
+zpool_compare(const void *larg, const void *rarg, void *unused)
+{
+	zpool_handle_t *l = ((zpool_node_t *)larg)->zn_handle;
+	zpool_handle_t *r = ((zpool_node_t *)rarg)->zn_handle;
+	const char *lname = zpool_get_name(l);
+	const char *rname = zpool_get_name(r);
+
+	return (strcmp(lname, rname));
+}
+
+/*
+ * Callback function for pool_list_get().  Adds the given pool to the AVL tree
+ * of known pools.
+ */
+static int
+add_pool(zpool_handle_t *zhp, void *data)
+{
+	zpool_list_t *zlp = data;
+	zpool_node_t *node = safe_malloc(sizeof (zpool_node_t));
+	uu_avl_index_t idx;
+
+	node->zn_handle = zhp;
+	uu_avl_node_init(node, &node->zn_avlnode, zlp->zl_pool);
+	if (uu_avl_find(zlp->zl_avl, node, NULL, &idx) == NULL) {
+		if (zlp->zl_proplist &&
+		    zpool_expand_proplist(zhp, zlp->zl_proplist) != 0) {
+			zpool_close(zhp);
+			free(node);
+			return (-1);
+		}
+		uu_avl_insert(zlp->zl_avl, node, idx);
+	} else {
+		zpool_close(zhp);
+		free(node);
+		return (-1);
+	}
+
+	return (0);
+}
+
+/*
+ * Create a list of pools based on the given arguments.  If we're given no
+ * arguments, then iterate over all pools in the system and add them to the AVL
+ * tree.  Otherwise, add only those pool explicitly specified on the command
+ * line.
+ */
+zpool_list_t *
+pool_list_get(int argc, char **argv, zprop_list_t **proplist, int *err)
+{
+	zpool_list_t *zlp;
+
+	zlp = safe_malloc(sizeof (zpool_list_t));
+
+	zlp->zl_pool = uu_avl_pool_create("zfs_pool", sizeof (zpool_node_t),
+	    offsetof(zpool_node_t, zn_avlnode), zpool_compare, UU_DEFAULT);
+
+	if (zlp->zl_pool == NULL)
+		zpool_no_memory();
+
+	if ((zlp->zl_avl = uu_avl_create(zlp->zl_pool, NULL,
+	    UU_DEFAULT)) == NULL)
+		zpool_no_memory();
+
+	zlp->zl_proplist = proplist;
+
+	if (argc == 0) {
+		(void) zpool_iter(g_zfs, add_pool, zlp);
+		zlp->zl_findall = B_TRUE;
+	} else {
+		int i;
+
+		for (i = 0; i < argc; i++) {
+			zpool_handle_t *zhp;
+
+			if (zhp = zpool_open_canfail(g_zfs, argv[i])) {
+				if (add_pool(zhp, zlp) != 0)
+					*err = B_TRUE;
+			} else {
+				*err = B_TRUE;
+			}
+		}
+	}
+
+	return (zlp);
+}
+
+/*
+ * Search for any new pools, adding them to the list.  We only add pools when no
+ * options were given on the command line.  Otherwise, we keep the list fixed as
+ * those that were explicitly specified.
+ */
+void
+pool_list_update(zpool_list_t *zlp)
+{
+	if (zlp->zl_findall)
+		(void) zpool_iter(g_zfs, add_pool, zlp);
+}
+
+/*
+ * Iterate over all pools in the list, executing the callback for each
+ */
+int
+pool_list_iter(zpool_list_t *zlp, int unavail, zpool_iter_f func,
+    void *data)
+{
+	zpool_node_t *node, *next_node;
+	int ret = 0;
+
+	for (node = uu_avl_first(zlp->zl_avl); node != NULL; node = next_node) {
+		next_node = uu_avl_next(zlp->zl_avl, node);
+		if (zpool_get_state(node->zn_handle) != POOL_STATE_UNAVAIL ||
+		    unavail)
+			ret |= func(node->zn_handle, data);
+	}
+
+	return (ret);
+}
+
+/*
+ * Remove the given pool from the list.  When running iostat, we want to remove
+ * those pools that no longer exist.
+ */
+void
+pool_list_remove(zpool_list_t *zlp, zpool_handle_t *zhp)
+{
+	zpool_node_t search, *node;
+
+	search.zn_handle = zhp;
+	if ((node = uu_avl_find(zlp->zl_avl, &search, NULL, NULL)) != NULL) {
+		uu_avl_remove(zlp->zl_avl, node);
+		zpool_close(node->zn_handle);
+		free(node);
+	}
+}
+
+/*
+ * Free all the handles associated with this list.
+ */
+void
+pool_list_free(zpool_list_t *zlp)
+{
+	uu_avl_walk_t *walk;
+	zpool_node_t *node;
+
+	if ((walk = uu_avl_walk_start(zlp->zl_avl, UU_WALK_ROBUST)) == NULL) {
+		(void) fprintf(stderr,
+		    gettext("internal error: out of memory"));
+		exit(1);
+	}
+
+	while ((node = uu_avl_walk_next(walk)) != NULL) {
+		uu_avl_remove(zlp->zl_avl, node);
+		zpool_close(node->zn_handle);
+		free(node);
+	}
+
+	uu_avl_walk_end(walk);
+	uu_avl_destroy(zlp->zl_avl);
+	uu_avl_pool_destroy(zlp->zl_pool);
+
+	free(zlp);
+}
+
+/*
+ * Returns the number of elements in the pool list.
+ */
+int
+pool_list_count(zpool_list_t *zlp)
+{
+	return (uu_avl_numnodes(zlp->zl_avl));
+}
+
+/*
+ * High level function which iterates over all pools given on the command line,
+ * using the pool_list_* interfaces.
+ */
+int
+for_each_pool(int argc, char **argv, boolean_t unavail,
+    zprop_list_t **proplist, zpool_iter_f func, void *data)
+{
+	zpool_list_t *list;
+	int ret = 0;
+
+	if ((list = pool_list_get(argc, argv, proplist, &ret)) == NULL)
+		return (1);
+
+	if (pool_list_iter(list, unavail, func, data) != 0)
+		ret = 1;
+
+	pool_list_free(list);
+
+	return (ret);
+}