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-rw-r--r--include/grub/zfs/zap_leaf.h103
1 files changed, 103 insertions, 0 deletions
diff --git a/include/grub/zfs/zap_leaf.h b/include/grub/zfs/zap_leaf.h
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+++ b/include/grub/zfs/zap_leaf.h
@@ -0,0 +1,103 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 1999,2000,2001,2002,2003,2004 Free Software Foundation, Inc.
+ *
+ * GRUB is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ */
+/*
+ * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
+ * Use is subject to license terms.
+ */
+
+#ifndef _SYS_ZAP_LEAF_H
+#define _SYS_ZAP_LEAF_H
+
+#define ZAP_LEAF_MAGIC 0x2AB1EAF
+
+/* chunk size = 24 bytes */
+#define ZAP_LEAF_CHUNKSIZE 24
+
+/*
+ * The amount of space within the chunk available for the array is:
+ * chunk size - space for type (1) - space for next pointer (2)
+ */
+#define ZAP_LEAF_ARRAY_BYTES (ZAP_LEAF_CHUNKSIZE - 3)
+
+typedef enum zap_chunk_type {
+ ZAP_CHUNK_FREE = 253,
+ ZAP_CHUNK_ENTRY = 252,
+ ZAP_CHUNK_ARRAY = 251,
+ ZAP_CHUNK_TYPE_MAX = 250
+} zap_chunk_type_t;
+
+/*
+ * TAKE NOTE:
+ * If zap_leaf_phys_t is modified, zap_leaf_byteswap() must be modified.
+ */
+typedef struct zap_leaf_phys {
+ struct zap_leaf_header {
+ grub_uint64_t lh_block_type; /* ZBT_LEAF */
+ grub_uint64_t lh_pad1;
+ grub_uint64_t lh_prefix; /* hash prefix of this leaf */
+ grub_uint32_t lh_magic; /* ZAP_LEAF_MAGIC */
+ grub_uint16_t lh_nfree; /* number free chunks */
+ grub_uint16_t lh_nentries; /* number of entries */
+ grub_uint16_t lh_prefix_len; /* num bits used to id this */
+
+/* above is accessable to zap, below is zap_leaf private */
+
+ grub_uint16_t lh_freelist; /* chunk head of free list */
+ grub_uint8_t lh_pad2[12];
+ } l_hdr; /* 2 24-byte chunks */
+
+ /*
+ * The header is followed by a hash table with
+ * ZAP_LEAF_HASH_NUMENTRIES(zap) entries. The hash table is
+ * followed by an array of ZAP_LEAF_NUMCHUNKS(zap)
+ * zap_leaf_chunk structures. These structures are accessed
+ * with the ZAP_LEAF_CHUNK() macro.
+ */
+
+ grub_uint16_t l_hash[0];
+} zap_leaf_phys_t;
+
+typedef union zap_leaf_chunk {
+ struct zap_leaf_entry {
+ grub_uint8_t le_type; /* always ZAP_CHUNK_ENTRY */
+ grub_uint8_t le_int_size; /* size of ints */
+ grub_uint16_t le_next; /* next entry in hash chain */
+ grub_uint16_t le_name_chunk; /* first chunk of the name */
+ grub_uint16_t le_name_length; /* bytes in name, incl null */
+ grub_uint16_t le_value_chunk; /* first chunk of the value */
+ grub_uint16_t le_value_length; /* value length in ints */
+ grub_uint32_t le_cd; /* collision differentiator */
+ grub_uint64_t le_hash; /* hash value of the name */
+ } l_entry;
+ struct zap_leaf_array {
+ grub_uint8_t la_type; /* always ZAP_CHUNK_ARRAY */
+ union
+ {
+ grub_uint8_t la_array[ZAP_LEAF_ARRAY_BYTES];
+ grub_uint64_t la_array64;
+ } GRUB_PACKED;
+ grub_uint16_t la_next; /* next blk or CHAIN_END */
+ } l_array;
+ struct zap_leaf_free {
+ grub_uint8_t lf_type; /* always ZAP_CHUNK_FREE */
+ grub_uint8_t lf_pad[ZAP_LEAF_ARRAY_BYTES];
+ grub_uint16_t lf_next; /* next in free list, or CHAIN_END */
+ } l_free;
+} zap_leaf_chunk_t;
+
+#endif /* _SYS_ZAP_LEAF_H */