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-rw-r--r--uts/common/fs/zfs/ddt_zap.c157
1 files changed, 157 insertions, 0 deletions
diff --git a/uts/common/fs/zfs/ddt_zap.c b/uts/common/fs/zfs/ddt_zap.c
new file mode 100644
index 000000000000..d6a991c7c19e
--- /dev/null
+++ b/uts/common/fs/zfs/ddt_zap.c
@@ -0,0 +1,157 @@
+/*
+ * 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 (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
+ */
+
+#include <sys/zfs_context.h>
+#include <sys/spa.h>
+#include <sys/zio.h>
+#include <sys/ddt.h>
+#include <sys/zap.h>
+#include <sys/dmu_tx.h>
+#include <util/sscanf.h>
+
+int ddt_zap_leaf_blockshift = 12;
+int ddt_zap_indirect_blockshift = 12;
+
+static int
+ddt_zap_create(objset_t *os, uint64_t *objectp, dmu_tx_t *tx, boolean_t prehash)
+{
+ zap_flags_t flags = ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY;
+
+ if (prehash)
+ flags |= ZAP_FLAG_PRE_HASHED_KEY;
+
+ *objectp = zap_create_flags(os, 0, flags, DMU_OT_DDT_ZAP,
+ ddt_zap_leaf_blockshift, ddt_zap_indirect_blockshift,
+ DMU_OT_NONE, 0, tx);
+
+ return (*objectp == 0 ? ENOTSUP : 0);
+}
+
+static int
+ddt_zap_destroy(objset_t *os, uint64_t object, dmu_tx_t *tx)
+{
+ return (zap_destroy(os, object, tx));
+}
+
+static int
+ddt_zap_lookup(objset_t *os, uint64_t object, ddt_entry_t *dde)
+{
+ uchar_t cbuf[sizeof (dde->dde_phys) + 1];
+ uint64_t one, csize;
+ int error;
+
+ error = zap_length_uint64(os, object, (uint64_t *)&dde->dde_key,
+ DDT_KEY_WORDS, &one, &csize);
+ if (error)
+ return (error);
+
+ ASSERT(one == 1);
+ ASSERT(csize <= sizeof (cbuf));
+
+ error = zap_lookup_uint64(os, object, (uint64_t *)&dde->dde_key,
+ DDT_KEY_WORDS, 1, csize, cbuf);
+ if (error)
+ return (error);
+
+ ddt_decompress(cbuf, dde->dde_phys, csize, sizeof (dde->dde_phys));
+
+ return (0);
+}
+
+static void
+ddt_zap_prefetch(objset_t *os, uint64_t object, ddt_entry_t *dde)
+{
+ (void) zap_prefetch_uint64(os, object, (uint64_t *)&dde->dde_key,
+ DDT_KEY_WORDS);
+}
+
+static int
+ddt_zap_update(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
+{
+ uchar_t cbuf[sizeof (dde->dde_phys) + 1];
+ uint64_t csize;
+
+ csize = ddt_compress(dde->dde_phys, cbuf,
+ sizeof (dde->dde_phys), sizeof (cbuf));
+
+ return (zap_update_uint64(os, object, (uint64_t *)&dde->dde_key,
+ DDT_KEY_WORDS, 1, csize, cbuf, tx));
+}
+
+static int
+ddt_zap_remove(objset_t *os, uint64_t object, ddt_entry_t *dde, dmu_tx_t *tx)
+{
+ return (zap_remove_uint64(os, object, (uint64_t *)&dde->dde_key,
+ DDT_KEY_WORDS, tx));
+}
+
+static int
+ddt_zap_walk(objset_t *os, uint64_t object, ddt_entry_t *dde, uint64_t *walk)
+{
+ zap_cursor_t zc;
+ zap_attribute_t za;
+ int error;
+
+ zap_cursor_init_serialized(&zc, os, object, *walk);
+ if ((error = zap_cursor_retrieve(&zc, &za)) == 0) {
+ uchar_t cbuf[sizeof (dde->dde_phys) + 1];
+ uint64_t csize = za.za_num_integers;
+ ASSERT(za.za_integer_length == 1);
+ error = zap_lookup_uint64(os, object, (uint64_t *)za.za_name,
+ DDT_KEY_WORDS, 1, csize, cbuf);
+ ASSERT(error == 0);
+ if (error == 0) {
+ ddt_decompress(cbuf, dde->dde_phys, csize,
+ sizeof (dde->dde_phys));
+ dde->dde_key = *(ddt_key_t *)za.za_name;
+ }
+ zap_cursor_advance(&zc);
+ *walk = zap_cursor_serialize(&zc);
+ }
+ zap_cursor_fini(&zc);
+ return (error);
+}
+
+static uint64_t
+ddt_zap_count(objset_t *os, uint64_t object)
+{
+ uint64_t count = 0;
+
+ VERIFY(zap_count(os, object, &count) == 0);
+
+ return (count);
+}
+
+const ddt_ops_t ddt_zap_ops = {
+ "zap",
+ ddt_zap_create,
+ ddt_zap_destroy,
+ ddt_zap_lookup,
+ ddt_zap_prefetch,
+ ddt_zap_update,
+ ddt_zap_remove,
+ ddt_zap_walk,
+ ddt_zap_count,
+};