kernel/fs/zfs/sys/sa_impl.h

   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) 2013 by Delphix. All rights reserved.
  24  * Copyright (c) 2014 Spectra Logic Corporation, All rights reserved.
  25  */
  26
  27 #ifndef _SYS_SA_IMPL_H
  28 #define _SYS_SA_IMPL_H
  29
  30 #include <sys/dmu.h>
  31 #include <sys/refcount.h>
  32 #include <sys/list.h>
  33
  34 /*
  35  * Array of known attributes and their
  36  * various characteristics.
  37  */
  38 typedef struct sa_attr_table {
  39         sa_attr_type_t  sa_attr;
  40         uint8_t sa_registered;
  41         uint16_t sa_length;
  42         sa_bswap_type_t sa_byteswap;
  43         char *sa_name;
  44 } sa_attr_table_t;
  45
  46 /*
  47  * Zap attribute format for attribute registration
  48  *
  49  * 64      56      48      40      32      24      16      8       0
  50  * +-------+-------+-------+-------+-------+-------+-------+-------+
  51  * |        unused         |      len      | bswap |   attr num    |
  52  * +-------+-------+-------+-------+-------+-------+-------+-------+
  53  *
  54  * Zap attribute format for layout information.
  55  *
  56  * layout information is stored as an array of attribute numbers
  57  * The name of the attribute is the layout number (0, 1, 2, ...)
  58  *
  59  * 16       0
  60  * +---- ---+
  61  * | attr # |
  62  * +--------+
  63  * | attr # |
  64  * +--- ----+
  65  *  ......
  66  *
  67  */
  68
  69 #define ATTR_BSWAP(x)   BF32_GET(x, 16, 8)
  70 #define ATTR_LENGTH(x)  BF32_GET(x, 24, 16)
  71 #define ATTR_NUM(x)     BF32_GET(x, 0, 16)
  72 #define ATTR_ENCODE(x, attr, length, bswap) \
  73 { \
  74         BF64_SET(x, 24, 16, length); \
  75         BF64_SET(x, 16, 8, bswap); \
  76         BF64_SET(x, 0, 16, attr); \
  77 }
  78
  79 #define TOC_OFF(x)              BF32_GET(x, 0, 23)
  80 #define TOC_ATTR_PRESENT(x)     BF32_GET(x, 31, 1)
  81 #define TOC_LEN_IDX(x)          BF32_GET(x, 24, 4)
  82 #define TOC_ATTR_ENCODE(x, len_idx, offset) \
  83 { \
  84         BF32_SET(x, 31, 1, 1); \
  85         BF32_SET(x, 24, 7, len_idx); \
  86         BF32_SET(x, 0, 24, offset); \
  87 }
  88
  89 #define SA_LAYOUTS      "LAYOUTS"
  90 #define SA_REGISTRY     "REGISTRY"
  91
  92 /*
  93  * Each unique layout will have their own table
  94  * sa_lot (layout_table)
  95  */
  96 typedef struct sa_lot {
  97         avl_node_t lot_num_node;
  98         avl_node_t lot_hash_node;
  99         uint64_t lot_num;
 100         uint64_t lot_hash;
 101         sa_attr_type_t *lot_attrs;      /* array of attr #'s */
 102         uint32_t lot_var_sizes; /* how many aren't fixed size */
 103         uint32_t lot_attr_count;        /* total attr count */
 104         list_t  lot_idx_tab;    /* should be only a couple of entries */
 105         int     lot_instance;   /* used with lot_hash to identify entry */
 106 } sa_lot_t;
 107
 108 /* index table of offsets */
 109 typedef struct sa_idx_tab {
 110         list_node_t     sa_next;
 111         sa_lot_t        *sa_layout;
 112         uint16_t        *sa_variable_lengths;
 113         refcount_t      sa_refcount;
 114         uint32_t        *sa_idx_tab;    /* array of offsets */
 115 } sa_idx_tab_t;
 116
 117 /*
 118  * Since the offset/index information into the actual data
 119  * will usually be identical we can share that information with
 120  * all handles that have the exact same offsets.
 121  *
 122  * You would typically only have a large number of different table of
 123  * contents if you had a several variable sized attributes.
 124  *
 125  * Two AVL trees are used to track the attribute layout numbers.
 126  * one is keyed by number and will be consulted when a DMU_OT_SA
 127  * object is first read.  The second tree is keyed by the hash signature
 128  * of the attributes and will be consulted when an attribute is added
 129  * to determine if we already have an instance of that layout.  Both
 130  * of these tree's are interconnected.  The only difference is that
 131  * when an entry is found in the "hash" tree the list of attributes will
 132  * need to be compared against the list of attributes you have in hand.
 133  * The assumption is that typically attributes will just be updated and
 134  * adding a completely new attribute is a very rare operation.
 135  */
 136 struct sa_os {
 137         kmutex_t        sa_lock;
 138         boolean_t       sa_need_attr_registration;
 139         boolean_t       sa_force_spill;
 140         uint64_t        sa_master_obj;
 141         uint64_t        sa_reg_attr_obj;
 142         uint64_t        sa_layout_attr_obj;
 143         int             sa_num_attrs;
 144         sa_attr_table_t *sa_attr_table;  /* private attr table */
 145         sa_update_cb_t  *sa_update_cb;
 146         avl_tree_t      sa_layout_num_tree;  /* keyed by layout number */
 147         avl_tree_t      sa_layout_hash_tree; /* keyed by layout hash value */
 148         int             sa_user_table_sz;
 149         sa_attr_type_t  *sa_user_table; /* user name->attr mapping table */
 150 };
 151
 152 /*
 153  * header for all bonus and spill buffers.
 154  *
 155  * The header has a fixed portion with a variable number
 156  * of "lengths" depending on the number of variable sized
 157  * attributes which are determined by the "layout number"
 158  */
 159
 160 #define SA_MAGIC        0x2F505A  /* ZFS SA */
 161 typedef struct sa_hdr_phys {
 162         uint32_t sa_magic;
 163         /* BEGIN CSTYLED */
 164         /*
 165          * Encoded with hdrsize and layout number as follows:
 166          * 16      10       0
 167          * +--------+-------+
 168          * | hdrsz  |layout |
 169          * +--------+-------+
 170          *
 171          * Bits 0-10 are the layout number
 172          * Bits 11-16 are the size of the header.
 173          * The hdrsize is the number * 8
 174          *
 175          * For example.
 176          * hdrsz of 1 ==> 8 byte header
 177          *          2 ==> 16 byte header
 178          *
 179          */
 180         /* END CSTYLED */
 181         uint16_t sa_layout_info;
 182         uint16_t sa_lengths[1]; /* optional sizes for variable length attrs */
 183         /* ... Data follows the lengths.  */
 184 } sa_hdr_phys_t;
 185
 186 #define SA_HDR_LAYOUT_NUM(hdr) BF32_GET(hdr->sa_layout_info, 0, 10)
 187 #define SA_HDR_SIZE(hdr) BF32_GET_SB(hdr->sa_layout_info, 10, 6, 3, 0)
 188 #define SA_HDR_LAYOUT_INFO_ENCODE(x, num, size) \
 189 { \
 190         BF32_SET_SB(x, 10, 6, 3, 0, size); \
 191         BF32_SET(x, 0, 10, num); \
 192 }
 193
 194 typedef enum sa_buf_type {
 195         SA_BONUS = 1,
 196         SA_SPILL = 2
 197 } sa_buf_type_t;
 198
 199 typedef enum sa_data_op {
 200         SA_LOOKUP,
 201         SA_UPDATE,
 202         SA_ADD,
 203         SA_REPLACE,
 204         SA_REMOVE
 205 } sa_data_op_t;
 206
 207 /*
 208  * Opaque handle used for most sa functions
 209  *
 210  * This needs to be kept as small as possible.
 211  */
 212
 213 struct sa_handle {
 214         dmu_buf_user_t  sa_dbu;
 215         kmutex_t        sa_lock;
 216         dmu_buf_t       *sa_bonus;
 217         dmu_buf_t       *sa_spill;
 218         objset_t        *sa_os;
 219         void            *sa_userp;
 220         sa_idx_tab_t    *sa_bonus_tab;   /* idx of bonus */
 221         sa_idx_tab_t    *sa_spill_tab; /* only present if spill activated */
 222 };
 223
 224 #define SA_GET_DB(hdl, type)    \
 225         (dmu_buf_impl_t *)((type == SA_BONUS) ? hdl->sa_bonus : hdl->sa_spill)
 226
 227 #define SA_GET_HDR(hdl, type) \
 228         ((sa_hdr_phys_t *)((dmu_buf_impl_t *)(SA_GET_DB(hdl, \
 229         type))->db.db_data))
 230
 231 #define SA_IDX_TAB_GET(hdl, type) \
 232         (type == SA_BONUS ? hdl->sa_bonus_tab : hdl->sa_spill_tab)
 233
 234 #define IS_SA_BONUSTYPE(a)      \
 235         ((a == DMU_OT_SA) ? B_TRUE : B_FALSE)
 236
 237 #define SA_BONUSTYPE_FROM_DB(db) \
 238         (dmu_get_bonustype((dmu_buf_t *)db))
 239
 240 #define SA_BLKPTR_SPACE (DN_MAX_BONUSLEN - sizeof (blkptr_t))
 241
 242 #define SA_LAYOUT_NUM(x, type) \
 243         ((!IS_SA_BONUSTYPE(type) ? 0 : (((IS_SA_BONUSTYPE(type)) && \
 244         ((SA_HDR_LAYOUT_NUM(x)) == 0)) ? 1 : SA_HDR_LAYOUT_NUM(x))))
 245
 246
 247 #define SA_REGISTERED_LEN(sa, attr) sa->sa_attr_table[attr].sa_length
 248
 249 #define SA_ATTR_LEN(sa, idx, attr, hdr) ((SA_REGISTERED_LEN(sa, attr) == 0) ?\
 250         hdr->sa_lengths[TOC_LEN_IDX(idx->sa_idx_tab[attr])] : \
 251         SA_REGISTERED_LEN(sa, attr))
 252
 253 #define SA_SET_HDR(hdr, num, size) \
 254         { \
 255                 hdr->sa_magic = SA_MAGIC; \
 256                 SA_HDR_LAYOUT_INFO_ENCODE(hdr->sa_layout_info, num, size); \
 257         }
 258
 259 #define SA_ATTR_INFO(sa, idx, hdr, attr, bulk, type, hdl) \
 260         { \
 261                 bulk.sa_size = SA_ATTR_LEN(sa, idx, attr, hdr); \
 262                 bulk.sa_buftype = type; \
 263                 bulk.sa_addr = \
 264                     (void *)((uintptr_t)TOC_OFF(idx->sa_idx_tab[attr]) + \
 265                     (uintptr_t)hdr); \
 266 }
 267
 268 #define SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) \
 269         (SA_HDR_SIZE(hdr) == (sizeof (sa_hdr_phys_t) + \
 270         (tb->lot_var_sizes > 1 ? P2ROUNDUP((tb->lot_var_sizes - 1) * \
 271         sizeof (uint16_t), 8) : 0)))
 272
 273 int sa_add_impl(sa_handle_t *, sa_attr_type_t,
 274     uint32_t, sa_data_locator_t, void *, dmu_tx_t *);
 275
 276 void sa_register_update_callback_locked(objset_t *, sa_update_cb_t *);
 277 int sa_size_locked(sa_handle_t *, sa_attr_type_t, int *);
 278
 279 void sa_default_locator(void **, uint32_t *, uint32_t, boolean_t, void *);
 280 int sa_attr_size(sa_os_t *, sa_idx_tab_t *, sa_attr_type_t,
 281     uint16_t *, sa_hdr_phys_t *);
 282
 283 #ifdef  __cplusplus
 284 extern "C" {
 285 #endif
 286
 287 #ifdef  __cplusplus
 288 }
 289 #endif
 290
 291 #endif  /* _SYS_SA_IMPL_H */