1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved. 23 * Copyright (c) 2012 by Delphix. All rights reserved. 24 */ 25 26 #ifndef _SYS_SA_IMPL_H 27 #define _SYS_SA_IMPL_H 28 29 #include <sys/dmu.h> 30 #include <sys/refcount.h> 31 #include <sys/list.h> 32 33 /* 34 * Array of known attributes and their 35 * various characteristics. 36 */ 37 typedef struct sa_attr_table { 38 sa_attr_type_t sa_attr; 39 uint8_t sa_registered; 40 uint16_t sa_length; 41 sa_bswap_type_t sa_byteswap; 42 char *sa_name; 43 } sa_attr_table_t; 44 45 /* 46 * Zap attribute format for attribute registration 47 * 48 * 64 56 48 40 32 24 16 8 0 49 * +-------+-------+-------+-------+-------+-------+-------+-------+ 50 * | unused | len | bswap | attr num | 51 * +-------+-------+-------+-------+-------+-------+-------+-------+ 52 * 53 * Zap attribute format for layout information. 54 * 55 * layout information is stored as an array of attribute numbers 56 * The name of the attribute is the layout number (0, 1, 2, ...) 57 * 58 * 16 0 59 * +---- ---+ 60 * | attr # | 61 * +--------+ 62 * | attr # | 63 * +--- ----+ 64 * ...... 65 * 66 */ 67 68 #define ATTR_BSWAP(x) BF32_GET(x, 16, 8) 69 #define ATTR_LENGTH(x) BF32_GET(x, 24, 16) 70 #define ATTR_NUM(x) BF32_GET(x, 0, 16) 71 #define ATTR_ENCODE(x, attr, length, bswap) \ 72 { \ 73 BF64_SET(x, 24, 16, length); \ 74 BF64_SET(x, 16, 8, bswap); \ 75 BF64_SET(x, 0, 16, attr); \ 76 } 77 78 #define TOC_OFF(x) BF32_GET(x, 0, 23) 79 #define TOC_ATTR_PRESENT(x) BF32_GET(x, 31, 1) 80 #define TOC_LEN_IDX(x) BF32_GET(x, 24, 4) 81 #define TOC_ATTR_ENCODE(x, len_idx, offset) \ 82 { \ 83 BF32_SET(x, 31, 1, 1); \ 84 BF32_SET(x, 24, 7, len_idx); \ 85 BF32_SET(x, 0, 24, offset); \ 86 } 87 88 #define SA_LAYOUTS "LAYOUTS" 89 #define SA_REGISTRY "REGISTRY" 90 91 /* 92 * Each unique layout will have their own table 93 * sa_lot (layout_table) 94 */ 95 typedef struct sa_lot { 96 avl_node_t lot_num_node; 97 avl_node_t lot_hash_node; 98 uint64_t lot_num; 99 uint64_t lot_hash; 100 sa_attr_type_t *lot_attrs; /* array of attr #'s */ 101 uint32_t lot_var_sizes; /* how many aren't fixed size */ 102 uint32_t lot_attr_count; /* total attr count */ 103 list_t lot_idx_tab; /* should be only a couple of entries */ 104 int lot_instance; /* used with lot_hash to identify entry */ 105 } sa_lot_t; 106 107 /* index table of offsets */ 108 typedef struct sa_idx_tab { 109 list_node_t sa_next; 110 sa_lot_t *sa_layout; 111 uint16_t *sa_variable_lengths; 112 refcount_t sa_refcount; 113 uint32_t *sa_idx_tab; /* array of offsets */ 114 } sa_idx_tab_t; 115 116 /* 117 * Since the offset/index information into the actual data 118 * will usually be identical we can share that information with 119 * all handles that have the exact same offsets. 120 * 121 * You would typically only have a large number of different table of 122 * contents if you had a several variable sized attributes. 123 * 124 * Two AVL trees are used to track the attribute layout numbers. 125 * one is keyed by number and will be consulted when a DMU_OT_SA 126 * object is first read. The second tree is keyed by the hash signature 127 * of the attributes and will be consulted when an attribute is added 128 * to determine if we already have an instance of that layout. Both 129 * of these tree's are interconnected. The only difference is that 130 * when an entry is found in the "hash" tree the list of attributes will 131 * need to be compared against the list of attributes you have in hand. 132 * The assumption is that typically attributes will just be updated and 133 * adding a completely new attribute is a very rare operation. 134 */ 135 struct sa_os { 136 kmutex_t sa_lock; 137 boolean_t sa_need_attr_registration; 138 boolean_t sa_force_spill; 139 uint64_t sa_master_obj; 140 uint64_t sa_reg_attr_obj; 141 uint64_t sa_layout_attr_obj; 142 int sa_num_attrs; 143 sa_attr_table_t *sa_attr_table; /* private attr table */ 144 sa_update_cb_t *sa_update_cb; 145 avl_tree_t sa_layout_num_tree; /* keyed by layout number */ 146 avl_tree_t sa_layout_hash_tree; /* keyed by layout hash value */ 147 int sa_user_table_sz; 148 sa_attr_type_t *sa_user_table; /* user name->attr mapping table */ 149 }; 150 151 /* 152 * header for all bonus and spill buffers. 153 * The header has a fixed portion with a variable number 154 * of "lengths" depending on the number of variable sized 155 * attribues which are determined by the "layout number" 156 */ 157 158 #define SA_MAGIC 0x2F505A /* ZFS SA */ 159 typedef struct sa_hdr_phys { 160 uint32_t sa_magic; 161 uint16_t sa_layout_info; /* Encoded with hdrsize and layout number */ 162 uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */ 163 /* ... Data follows the lengths. */ 164 } sa_hdr_phys_t; 165 166 /* 167 * sa_hdr_phys -> sa_layout_info 168 * 169 * 16 10 0 170 * +--------+-------+ 171 * | hdrsz |layout | 172 * +--------+-------+ 173 * 174 * Bits 0-10 are the layout number 175 * Bits 11-16 are the size of the header. 176 * The hdrsize is the number * 8 177 * 178 * For example. 179 * hdrsz of 1 ==> 8 byte header 180 * 2 ==> 16 byte header 181 * 182 */ 183 184 #define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10) 185 #define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0) 186 #define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \ 187 { \ 188 BF32_SET_SB(x, 10, 6, 3, 0, size); \ 189 BF32_SET(x, 0, 10, num); \ 190 } 191 192 typedef enum sa_buf_type { 193 SA_BONUS = 1, 194 SA_SPILL = 2 195 } sa_buf_type_t; 196 197 typedef enum sa_data_op { 198 SA_LOOKUP, 199 SA_UPDATE, 200 SA_ADD, 201 SA_REPLACE, 202 SA_REMOVE 203 } sa_data_op_t; 204 205 /* 206 * Opaque handle used for most sa functions 207 * 208 * This needs to be kept as small as possible. 209 */ 210 211 struct sa_handle { 212 kmutex_t sa_lock; 213 dmu_buf_t *sa_bonus; 214 dmu_buf_t *sa_spill; 215 objset_t *sa_os; 216 void *sa_userp; 217 sa_idx_tab_t *sa_bonus_tab; /* idx of bonus */ 218 sa_idx_tab_t *sa_spill_tab; /* only present if spill activated */ 219 }; 220 221 #define SA_GET_DB(hdl, type) \ 222 (dmu_buf_impl_t *)((type == SA_BONUS) ? hdl->sa_bonus : hdl->sa_spill) 223 224 #define SA_GET_HDR(hdl, type) \ 225 ((sa_hdr_phys_t *)((dmu_buf_impl_t *)(SA_GET_DB(hdl, \ 226 type))->db.db_data)) 227 228 #define SA_IDX_TAB_GET(hdl, type) \ 229 (type == SA_BONUS ? hdl->sa_bonus_tab : hdl->sa_spill_tab) 230 231 #define IS_SA_BONUSTYPE(a) \ 232 ((a == DMU_OT_SA) ? B_TRUE : B_FALSE) 233 234 #define SA_BONUSTYPE_FROM_DB(db) \ 235 (dmu_get_bonustype((dmu_buf_t *)db)) 236 237 #define SA_BLKPTR_SPACE (DN_MAX_BONUSLEN - sizeof (blkptr_t)) 238 239 #define SA_LAYOUT_NUM(x, type) \ 240 ((!IS_SA_BONUSTYPE(type) ? 0 : (((IS_SA_BONUSTYPE(type)) && \ 241 ((SA_HDR_LAYOUT_NUM(x)) == 0)) ? 1 : SA_HDR_LAYOUT_NUM(x)))) 242 243 244 #define SA_REGISTERED_LEN(sa, attr) sa->sa_attr_table[attr].sa_length 245 246 #define SA_ATTR_LEN(sa, idx, attr, hdr) ((SA_REGISTERED_LEN(sa, attr) == 0) ?\ 247 hdr->sa_lengths[TOC_LEN_IDX(idx->sa_idx_tab[attr])] : \ 248 SA_REGISTERED_LEN(sa, attr)) 249 250 #define SA_SET_HDR(hdr, num, size) \ 251 { \ 252 hdr->sa_magic = SA_MAGIC; \ 253 SA_HDR_LAYOUT_INFO_ENCODE(hdr->sa_layout_info, num, size); \ 254 } 255 256 #define SA_ATTR_INFO(sa, idx, hdr, attr, bulk, type, hdl) \ 257 { \ 258 bulk.sa_size = SA_ATTR_LEN(sa, idx, attr, hdr); \ 259 bulk.sa_buftype = type; \ 260 bulk.sa_addr = \ 261 (void *)((uintptr_t)TOC_OFF(idx->sa_idx_tab[attr]) + \ 262 (uintptr_t)hdr); \ 263 } 264 265 #define SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) \ 266 (SA_HDR_SIZE(hdr) == (sizeof (sa_hdr_phys_t) + \ 267 (tb->lot_var_sizes > 1 ? P2ROUNDUP((tb->lot_var_sizes - 1) * \ 268 sizeof (uint16_t), 8) : 0))) 269 270 int sa_add_impl(sa_handle_t *, sa_attr_type_t, 271 uint32_t, sa_data_locator_t, void *, dmu_tx_t *); 272 273 void sa_register_update_callback_locked(objset_t *, sa_update_cb_t *); 274 int sa_size_locked(sa_handle_t *, sa_attr_type_t, int *); 275 276 void sa_default_locator(void **, uint32_t *, uint32_t, boolean_t, void *); 277 int sa_attr_size(sa_os_t *, sa_idx_tab_t *, sa_attr_type_t, 278 uint16_t *, sa_hdr_phys_t *); 279 280 #ifdef __cplusplus 281 extern "C" { 282 #endif 283 284 #ifdef __cplusplus 285 } 286 #endif 287 288 #endif /* _SYS_SA_IMPL_H */ 289