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 /*
  23  * Copyright (c) 2010, Oracle and/or its affiliates. All rights reserved.
  24  * Portions Copyright 2011 iXsystems, Inc
  25  * Copyright (c) 2013 by Delphix. All rights reserved.
  26  */
  27 
  28 #include <sys/zfs_context.h>
  29 #include <sys/types.h>
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/sysmacros.h>
  33 #include <sys/dmu.h>
  34 #include <sys/dmu_impl.h>
  35 #include <sys/dmu_objset.h>
  36 #include <sys/dbuf.h>
  37 #include <sys/dnode.h>
  38 #include <sys/zap.h>
  39 #include <sys/sa.h>
  40 #include <sys/sunddi.h>
  41 #include <sys/sa_impl.h>
  42 #include <sys/dnode.h>
  43 #include <sys/errno.h>
  44 #include <sys/zfs_context.h>
  45 
  46 /*
  47  * ZFS System attributes:
  48  *
  49  * A generic mechanism to allow for arbitrary attributes
  50  * to be stored in a dnode.  The data will be stored in the bonus buffer of
  51  * the dnode and if necessary a special "spill" block will be used to handle
  52  * overflow situations.  The spill block will be sized to fit the data
  53  * from 512 - 128K.  When a spill block is used the BP (blkptr_t) for the
  54  * spill block is stored at the end of the current bonus buffer.  Any
  55  * attributes that would be in the way of the blkptr_t will be relocated
  56  * into the spill block.
  57  *
  58  * Attribute registration:
  59  *
  60  * Stored persistently on a per dataset basis
  61  * a mapping between attribute "string" names and their actual attribute
  62  * numeric values, length, and byteswap function.  The names are only used
  63  * during registration.  All  attributes are known by their unique attribute
  64  * id value.  If an attribute can have a variable size then the value
  65  * 0 will be used to indicate this.
  66  *
  67  * Attribute Layout:
  68  *
  69  * Attribute layouts are a way to compactly store multiple attributes, but
  70  * without taking the overhead associated with managing each attribute
  71  * individually.  Since you will typically have the same set of attributes
  72  * stored in the same order a single table will be used to represent that
  73  * layout.  The ZPL for example will usually have only about 10 different
  74  * layouts (regular files, device files, symlinks,
  75  * regular files + scanstamp, files/dir with extended attributes, and then
  76  * you have the possibility of all of those minus ACL, because it would
  77  * be kicked out into the spill block)
  78  *
  79  * Layouts are simply an array of the attributes and their
  80  * ordering i.e. [0, 1, 4, 5, 2]
  81  *
  82  * Each distinct layout is given a unique layout number and that is whats
  83  * stored in the header at the beginning of the SA data buffer.
  84  *
  85  * A layout only covers a single dbuf (bonus or spill).  If a set of
  86  * attributes is split up between the bonus buffer and a spill buffer then
  87  * two different layouts will be used.  This allows us to byteswap the
  88  * spill without looking at the bonus buffer and keeps the on disk format of
  89  * the bonus and spill buffer the same.
  90  *
  91  * Adding a single attribute will cause the entire set of attributes to
  92  * be rewritten and could result in a new layout number being constructed
  93  * as part of the rewrite if no such layout exists for the new set of
  94  * attribues.  The new attribute will be appended to the end of the already
  95  * existing attributes.
  96  *
  97  * Both the attribute registration and attribute layout information are
  98  * stored in normal ZAP attributes.  Their should be a small number of
  99  * known layouts and the set of attributes is assumed to typically be quite
 100  * small.
 101  *
 102  * The registered attributes and layout "table" information is maintained
 103  * in core and a special "sa_os_t" is attached to the objset_t.
 104  *
 105  * A special interface is provided to allow for quickly applying
 106  * a large set of attributes at once.  sa_replace_all_by_template() is
 107  * used to set an array of attributes.  This is used by the ZPL when
 108  * creating a brand new file.  The template that is passed into the function
 109  * specifies the attribute, size for variable length attributes, location of
 110  * data and special "data locator" function if the data isn't in a contiguous
 111  * location.
 112  *
 113  * Byteswap implications:
 114  * Since the SA attributes are not entirely self describing we can't do
 115  * the normal byteswap processing.  The special ZAP layout attribute and
 116  * attribute registration attributes define the byteswap function and the
 117  * size of the attributes, unless it is variable sized.
 118  * The normal ZFS byteswapping infrastructure assumes you don't need
 119  * to read any objects in order to do the necessary byteswapping.  Whereas
 120  * SA attributes can only be properly byteswapped if the dataset is opened
 121  * and the layout/attribute ZAP attributes are available.  Because of this
 122  * the SA attributes will be byteswapped when they are first accessed by
 123  * the SA code that will read the SA data.
 124  */
 125 
 126 typedef void (sa_iterfunc_t)(void *hdr, void *addr, sa_attr_type_t,
 127     uint16_t length, int length_idx, boolean_t, void *userp);
 128 
 129 static int sa_build_index(sa_handle_t *hdl, sa_buf_type_t buftype);
 130 static void sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab);
 131 static void *sa_find_idx_tab(objset_t *os, dmu_object_type_t bonustype,
 132     void *data);
 133 static void sa_idx_tab_rele(objset_t *os, void *arg);
 134 static void sa_copy_data(sa_data_locator_t *func, void *start, void *target,
 135     int buflen);
 136 static int sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
 137     sa_data_op_t action, sa_data_locator_t *locator, void *datastart,
 138     uint16_t buflen, dmu_tx_t *tx);
 139 
 140 arc_byteswap_func_t *sa_bswap_table[] = {
 141         byteswap_uint64_array,
 142         byteswap_uint32_array,
 143         byteswap_uint16_array,
 144         byteswap_uint8_array,
 145         zfs_acl_byteswap,
 146 };
 147 
 148 #define SA_COPY_DATA(f, s, t, l) \
 149         { \
 150                 if (f == NULL) { \
 151                         if (l == 8) { \
 152                                 *(uint64_t *)t = *(uint64_t *)s; \
 153                         } else if (l == 16) { \
 154                                 *(uint64_t *)t = *(uint64_t *)s; \
 155                                 *(uint64_t *)((uintptr_t)t + 8) = \
 156                                     *(uint64_t *)((uintptr_t)s + 8); \
 157                         } else { \
 158                                 bcopy(s, t, l); \
 159                         } \
 160                 } else \
 161                         sa_copy_data(f, s, t, l); \
 162         }
 163 
 164 /*
 165  * This table is fixed and cannot be changed.  Its purpose is to
 166  * allow the SA code to work with both old/new ZPL file systems.
 167  * It contains the list of legacy attributes.  These attributes aren't
 168  * stored in the "attribute" registry zap objects, since older ZPL file systems
 169  * won't have the registry.  Only objsets of type ZFS_TYPE_FILESYSTEM will
 170  * use this static table.
 171  */
 172 sa_attr_reg_t sa_legacy_attrs[] = {
 173         {"ZPL_ATIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 0},
 174         {"ZPL_MTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 1},
 175         {"ZPL_CTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 2},
 176         {"ZPL_CRTIME", sizeof (uint64_t) * 2, SA_UINT64_ARRAY, 3},
 177         {"ZPL_GEN", sizeof (uint64_t), SA_UINT64_ARRAY, 4},
 178         {"ZPL_MODE", sizeof (uint64_t), SA_UINT64_ARRAY, 5},
 179         {"ZPL_SIZE", sizeof (uint64_t), SA_UINT64_ARRAY, 6},
 180         {"ZPL_PARENT", sizeof (uint64_t), SA_UINT64_ARRAY, 7},
 181         {"ZPL_LINKS", sizeof (uint64_t), SA_UINT64_ARRAY, 8},
 182         {"ZPL_XATTR", sizeof (uint64_t), SA_UINT64_ARRAY, 9},
 183         {"ZPL_RDEV", sizeof (uint64_t), SA_UINT64_ARRAY, 10},
 184         {"ZPL_FLAGS", sizeof (uint64_t), SA_UINT64_ARRAY, 11},
 185         {"ZPL_UID", sizeof (uint64_t), SA_UINT64_ARRAY, 12},
 186         {"ZPL_GID", sizeof (uint64_t), SA_UINT64_ARRAY, 13},
 187         {"ZPL_PAD", sizeof (uint64_t) * 4, SA_UINT64_ARRAY, 14},
 188         {"ZPL_ZNODE_ACL", 88, SA_UINT8_ARRAY, 15},
 189 };
 190 
 191 /*
 192  * ZPL legacy layout
 193  * This is only used for objects of type DMU_OT_ZNODE
 194  */
 195 sa_attr_type_t sa_legacy_zpl_layout[] = {
 196     0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15
 197 };
 198 
 199 /*
 200  * Special dummy layout used for buffers with no attributes.
 201  */
 202 
 203 sa_attr_type_t sa_dummy_zpl_layout[] = { 0 };
 204 
 205 static int sa_legacy_attr_count = 16;
 206 static kmem_cache_t *sa_cache = NULL;
 207 
 208 /*ARGSUSED*/
 209 static int
 210 sa_cache_constructor(void *buf, void *unused, int kmflag)
 211 {
 212         sa_handle_t *hdl = buf;
 213 
 214         hdl->sa_bonus_tab = NULL;
 215         hdl->sa_spill_tab = NULL;
 216         hdl->sa_os = NULL;
 217         hdl->sa_userp = NULL;
 218         hdl->sa_bonus = NULL;
 219         hdl->sa_spill = NULL;
 220         mutex_init(&hdl->sa_lock, NULL, MUTEX_DEFAULT, NULL);
 221         return (0);
 222 }
 223 
 224 /*ARGSUSED*/
 225 static void
 226 sa_cache_destructor(void *buf, void *unused)
 227 {
 228         sa_handle_t *hdl = buf;
 229         mutex_destroy(&hdl->sa_lock);
 230 }
 231 
 232 void
 233 sa_cache_init(void)
 234 {
 235         sa_cache = kmem_cache_create("sa_cache",
 236             sizeof (sa_handle_t), 0, sa_cache_constructor,
 237             sa_cache_destructor, NULL, NULL, NULL, 0);
 238 }
 239 
 240 void
 241 sa_cache_fini(void)
 242 {
 243         if (sa_cache)
 244                 kmem_cache_destroy(sa_cache);
 245 }
 246 
 247 static int
 248 layout_num_compare(const void *arg1, const void *arg2)
 249 {
 250         const sa_lot_t *node1 = arg1;
 251         const sa_lot_t *node2 = arg2;
 252 
 253         if (node1->lot_num > node2->lot_num)
 254                 return (1);
 255         else if (node1->lot_num < node2->lot_num)
 256                 return (-1);
 257         return (0);
 258 }
 259 
 260 static int
 261 layout_hash_compare(const void *arg1, const void *arg2)
 262 {
 263         const sa_lot_t *node1 = arg1;
 264         const sa_lot_t *node2 = arg2;
 265 
 266         if (node1->lot_hash > node2->lot_hash)
 267                 return (1);
 268         if (node1->lot_hash < node2->lot_hash)
 269                 return (-1);
 270         if (node1->lot_instance > node2->lot_instance)
 271                 return (1);
 272         if (node1->lot_instance < node2->lot_instance)
 273                 return (-1);
 274         return (0);
 275 }
 276 
 277 boolean_t
 278 sa_layout_equal(sa_lot_t *tbf, sa_attr_type_t *attrs, int count)
 279 {
 280         int i;
 281 
 282         if (count != tbf->lot_attr_count)
 283                 return (1);
 284 
 285         for (i = 0; i != count; i++) {
 286                 if (attrs[i] != tbf->lot_attrs[i])
 287                         return (1);
 288         }
 289         return (0);
 290 }
 291 
 292 #define SA_ATTR_HASH(attr) (zfs_crc64_table[(-1ULL ^ attr) & 0xFF])
 293 
 294 static uint64_t
 295 sa_layout_info_hash(sa_attr_type_t *attrs, int attr_count)
 296 {
 297         int i;
 298         uint64_t crc = -1ULL;
 299 
 300         for (i = 0; i != attr_count; i++)
 301                 crc ^= SA_ATTR_HASH(attrs[i]);
 302 
 303         return (crc);
 304 }
 305 
 306 static int
 307 sa_get_spill(sa_handle_t *hdl)
 308 {
 309         int rc;
 310         if (hdl->sa_spill == NULL) {
 311                 if ((rc = dmu_spill_hold_existing(hdl->sa_bonus, NULL,
 312                     &hdl->sa_spill)) == 0)
 313                         VERIFY(0 == sa_build_index(hdl, SA_SPILL));
 314         } else {
 315                 rc = 0;
 316         }
 317 
 318         return (rc);
 319 }
 320 
 321 /*
 322  * Main attribute lookup/update function
 323  * returns 0 for success or non zero for failures
 324  *
 325  * Operates on bulk array, first failure will abort further processing
 326  */
 327 int
 328 sa_attr_op(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count,
 329     sa_data_op_t data_op, dmu_tx_t *tx)
 330 {
 331         sa_os_t *sa = hdl->sa_os->os_sa;
 332         int i;
 333         int error = 0;
 334         sa_buf_type_t buftypes;
 335 
 336         buftypes = 0;
 337 
 338         ASSERT(count > 0);
 339         for (i = 0; i != count; i++) {
 340                 ASSERT(bulk[i].sa_attr <= hdl->sa_os->os_sa->sa_num_attrs);
 341 
 342                 bulk[i].sa_addr = NULL;
 343                 /* First check the bonus buffer */
 344 
 345                 if (hdl->sa_bonus_tab && TOC_ATTR_PRESENT(
 346                     hdl->sa_bonus_tab->sa_idx_tab[bulk[i].sa_attr])) {
 347                         SA_ATTR_INFO(sa, hdl->sa_bonus_tab,
 348                             SA_GET_HDR(hdl, SA_BONUS),
 349                             bulk[i].sa_attr, bulk[i], SA_BONUS, hdl);
 350                         if (tx && !(buftypes & SA_BONUS)) {
 351                                 dmu_buf_will_dirty(hdl->sa_bonus, tx);
 352                                 buftypes |= SA_BONUS;
 353                         }
 354                 }
 355                 if (bulk[i].sa_addr == NULL &&
 356                     ((error = sa_get_spill(hdl)) == 0)) {
 357                         if (TOC_ATTR_PRESENT(
 358                             hdl->sa_spill_tab->sa_idx_tab[bulk[i].sa_attr])) {
 359                                 SA_ATTR_INFO(sa, hdl->sa_spill_tab,
 360                                     SA_GET_HDR(hdl, SA_SPILL),
 361                                     bulk[i].sa_attr, bulk[i], SA_SPILL, hdl);
 362                                 if (tx && !(buftypes & SA_SPILL) &&
 363                                     bulk[i].sa_size == bulk[i].sa_length) {
 364                                         dmu_buf_will_dirty(hdl->sa_spill, tx);
 365                                         buftypes |= SA_SPILL;
 366                                 }
 367                         }
 368                 }
 369                 if (error && error != ENOENT) {
 370                         return ((error == ECKSUM) ? EIO : error);
 371                 }
 372 
 373                 switch (data_op) {
 374                 case SA_LOOKUP:
 375                         if (bulk[i].sa_addr == NULL)
 376                                 return (SET_ERROR(ENOENT));
 377                         if (bulk[i].sa_data) {
 378                                 SA_COPY_DATA(bulk[i].sa_data_func,
 379                                     bulk[i].sa_addr, bulk[i].sa_data,
 380                                     bulk[i].sa_size);
 381                         }
 382                         continue;
 383 
 384                 case SA_UPDATE:
 385                         /* existing rewrite of attr */
 386                         if (bulk[i].sa_addr &&
 387                             bulk[i].sa_size == bulk[i].sa_length) {
 388                                 SA_COPY_DATA(bulk[i].sa_data_func,
 389                                     bulk[i].sa_data, bulk[i].sa_addr,
 390                                     bulk[i].sa_length);
 391                                 continue;
 392                         } else if (bulk[i].sa_addr) { /* attr size change */
 393                                 error = sa_modify_attrs(hdl, bulk[i].sa_attr,
 394                                     SA_REPLACE, bulk[i].sa_data_func,
 395                                     bulk[i].sa_data, bulk[i].sa_length, tx);
 396                         } else { /* adding new attribute */
 397                                 error = sa_modify_attrs(hdl, bulk[i].sa_attr,
 398                                     SA_ADD, bulk[i].sa_data_func,
 399                                     bulk[i].sa_data, bulk[i].sa_length, tx);
 400                         }
 401                         if (error)
 402                                 return (error);
 403                         break;
 404                 }
 405         }
 406         return (error);
 407 }
 408 
 409 static sa_lot_t *
 410 sa_add_layout_entry(objset_t *os, sa_attr_type_t *attrs, int attr_count,
 411     uint64_t lot_num, uint64_t hash, boolean_t zapadd, dmu_tx_t *tx)
 412 {
 413         sa_os_t *sa = os->os_sa;
 414         sa_lot_t *tb, *findtb;
 415         int i;
 416         avl_index_t loc;
 417 
 418         ASSERT(MUTEX_HELD(&sa->sa_lock));
 419         tb = kmem_zalloc(sizeof (sa_lot_t), KM_SLEEP);
 420         tb->lot_attr_count = attr_count;
 421         tb->lot_attrs = kmem_alloc(sizeof (sa_attr_type_t) * attr_count,
 422             KM_SLEEP);
 423         bcopy(attrs, tb->lot_attrs, sizeof (sa_attr_type_t) * attr_count);
 424         tb->lot_num = lot_num;
 425         tb->lot_hash = hash;
 426         tb->lot_instance = 0;
 427 
 428         if (zapadd) {
 429                 char attr_name[8];
 430 
 431                 if (sa->sa_layout_attr_obj == 0) {
 432                         sa->sa_layout_attr_obj = zap_create_link(os,
 433                             DMU_OT_SA_ATTR_LAYOUTS,
 434                             sa->sa_master_obj, SA_LAYOUTS, tx);
 435                 }
 436 
 437                 (void) snprintf(attr_name, sizeof (attr_name),
 438                     "%d", (int)lot_num);
 439                 VERIFY(0 == zap_update(os, os->os_sa->sa_layout_attr_obj,
 440                     attr_name, 2, attr_count, attrs, tx));
 441         }
 442 
 443         list_create(&tb->lot_idx_tab, sizeof (sa_idx_tab_t),
 444             offsetof(sa_idx_tab_t, sa_next));
 445 
 446         for (i = 0; i != attr_count; i++) {
 447                 if (sa->sa_attr_table[tb->lot_attrs[i]].sa_length == 0)
 448                         tb->lot_var_sizes++;
 449         }
 450 
 451         avl_add(&sa->sa_layout_num_tree, tb);
 452 
 453         /* verify we don't have a hash collision */
 454         if ((findtb = avl_find(&sa->sa_layout_hash_tree, tb, &loc)) != NULL) {
 455                 for (; findtb && findtb->lot_hash == hash;
 456                     findtb = AVL_NEXT(&sa->sa_layout_hash_tree, findtb)) {
 457                         if (findtb->lot_instance != tb->lot_instance)
 458                                 break;
 459                         tb->lot_instance++;
 460                 }
 461         }
 462         avl_add(&sa->sa_layout_hash_tree, tb);
 463         return (tb);
 464 }
 465 
 466 static void
 467 sa_find_layout(objset_t *os, uint64_t hash, sa_attr_type_t *attrs,
 468     int count, dmu_tx_t *tx, sa_lot_t **lot)
 469 {
 470         sa_lot_t *tb, tbsearch;
 471         avl_index_t loc;
 472         sa_os_t *sa = os->os_sa;
 473         boolean_t found = B_FALSE;
 474 
 475         mutex_enter(&sa->sa_lock);
 476         tbsearch.lot_hash = hash;
 477         tbsearch.lot_instance = 0;
 478         tb = avl_find(&sa->sa_layout_hash_tree, &tbsearch, &loc);
 479         if (tb) {
 480                 for (; tb && tb->lot_hash == hash;
 481                     tb = AVL_NEXT(&sa->sa_layout_hash_tree, tb)) {
 482                         if (sa_layout_equal(tb, attrs, count) == 0) {
 483                                 found = B_TRUE;
 484                                 break;
 485                         }
 486                 }
 487         }
 488         if (!found) {
 489                 tb = sa_add_layout_entry(os, attrs, count,
 490                     avl_numnodes(&sa->sa_layout_num_tree), hash, B_TRUE, tx);
 491         }
 492         mutex_exit(&sa->sa_lock);
 493         *lot = tb;
 494 }
 495 
 496 static int
 497 sa_resize_spill(sa_handle_t *hdl, uint32_t size, dmu_tx_t *tx)
 498 {
 499         int error;
 500         uint32_t blocksize;
 501 
 502         if (size == 0) {
 503                 blocksize = SPA_MINBLOCKSIZE;
 504         } else if (size > SPA_MAXBLOCKSIZE) {
 505                 ASSERT(0);
 506                 return (SET_ERROR(EFBIG));
 507         } else {
 508                 blocksize = P2ROUNDUP_TYPED(size, SPA_MINBLOCKSIZE, uint32_t);
 509         }
 510 
 511         error = dbuf_spill_set_blksz(hdl->sa_spill, blocksize, tx);
 512         ASSERT(error == 0);
 513         return (error);
 514 }
 515 
 516 static void
 517 sa_copy_data(sa_data_locator_t *func, void *datastart, void *target, int buflen)
 518 {
 519         if (func == NULL) {
 520                 bcopy(datastart, target, buflen);
 521         } else {
 522                 boolean_t start;
 523                 int bytes;
 524                 void *dataptr;
 525                 void *saptr = target;
 526                 uint32_t length;
 527 
 528                 start = B_TRUE;
 529                 bytes = 0;
 530                 while (bytes < buflen) {
 531                         func(&dataptr, &length, buflen, start, datastart);
 532                         bcopy(dataptr, saptr, length);
 533                         saptr = (void *)((caddr_t)saptr + length);
 534                         bytes += length;
 535                         start = B_FALSE;
 536                 }
 537         }
 538 }
 539 
 540 /*
 541  * Determine several different sizes
 542  * first the sa header size
 543  * the number of bytes to be stored
 544  * if spill would occur the index in the attribute array is returned
 545  *
 546  * the boolean will_spill will be set when spilling is necessary.  It
 547  * is only set when the buftype is SA_BONUS
 548  */
 549 static int
 550 sa_find_sizes(sa_os_t *sa, sa_bulk_attr_t *attr_desc, int attr_count,
 551     dmu_buf_t *db, sa_buf_type_t buftype, int *index, int *total,
 552     boolean_t *will_spill)
 553 {
 554         int var_size = 0;
 555         int i;
 556         int j = -1;
 557         int full_space;
 558         int hdrsize;
 559         boolean_t done = B_FALSE;
 560 
 561         if (buftype == SA_BONUS && sa->sa_force_spill) {
 562                 *total = 0;
 563                 *index = 0;
 564                 *will_spill = B_TRUE;
 565                 return (0);
 566         }
 567 
 568         *index = -1;
 569         *total = 0;
 570 
 571         if (buftype == SA_BONUS)
 572                 *will_spill = B_FALSE;
 573 
 574         hdrsize = (SA_BONUSTYPE_FROM_DB(db) == DMU_OT_ZNODE) ? 0 :
 575             sizeof (sa_hdr_phys_t);
 576 
 577         full_space = (buftype == SA_BONUS) ? DN_MAX_BONUSLEN : db->db_size;
 578         ASSERT(IS_P2ALIGNED(full_space, 8));
 579 
 580         for (i = 0; i != attr_count; i++) {
 581                 boolean_t is_var_sz;
 582 
 583                 *total = P2ROUNDUP(*total, 8);
 584                 *total += attr_desc[i].sa_length;
 585                 if (done)
 586                         goto next;
 587 
 588                 is_var_sz = (SA_REGISTERED_LEN(sa, attr_desc[i].sa_attr) == 0);
 589                 if (is_var_sz) {
 590                         var_size++;
 591                 }
 592 
 593                 if (is_var_sz && var_size > 1) {
 594                         if (P2ROUNDUP(hdrsize + sizeof (uint16_t), 8) +
 595                             *total < full_space) {
 596                                 /*
 597                                  * Account for header space used by array of
 598                                  * optional sizes of variable-length attributes.
 599                                  * Record the index in case this increase needs
 600                                  * to be reversed due to spill-over.
 601                                  */
 602                                 hdrsize += sizeof (uint16_t);
 603                                 j = i;
 604                         } else {
 605                                 done = B_TRUE;
 606                                 *index = i;
 607                                 if (buftype == SA_BONUS)
 608                                         *will_spill = B_TRUE;
 609                                 continue;
 610                         }
 611                 }
 612 
 613                 /*
 614                  * find index of where spill *could* occur.
 615                  * Then continue to count of remainder attribute
 616                  * space.  The sum is used later for sizing bonus
 617                  * and spill buffer.
 618                  */
 619                 if (buftype == SA_BONUS && *index == -1 &&
 620                     *total + P2ROUNDUP(hdrsize, 8) >
 621                     (full_space - sizeof (blkptr_t))) {
 622                         *index = i;
 623                         done = B_TRUE;
 624                 }
 625 
 626 next:
 627                 if (*total + P2ROUNDUP(hdrsize, 8) > full_space &&
 628                     buftype == SA_BONUS)
 629                         *will_spill = B_TRUE;
 630         }
 631 
 632         /*
 633          * j holds the index of the last variable-sized attribute for
 634          * which hdrsize was increased.  Reverse the increase if that
 635          * attribute will be relocated to the spill block.
 636          */
 637         if (*will_spill && j == *index)
 638                 hdrsize -= sizeof (uint16_t);
 639 
 640         hdrsize = P2ROUNDUP(hdrsize, 8);
 641         return (hdrsize);
 642 }
 643 
 644 #define BUF_SPACE_NEEDED(total, header) (total + header)
 645 
 646 /*
 647  * Find layout that corresponds to ordering of attributes
 648  * If not found a new layout number is created and added to
 649  * persistent layout tables.
 650  */
 651 static int
 652 sa_build_layouts(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc, int attr_count,
 653     dmu_tx_t *tx)
 654 {
 655         sa_os_t *sa = hdl->sa_os->os_sa;
 656         uint64_t hash;
 657         sa_buf_type_t buftype;
 658         sa_hdr_phys_t *sahdr;
 659         void *data_start;
 660         int buf_space;
 661         sa_attr_type_t *attrs, *attrs_start;
 662         int i, lot_count;
 663         int hdrsize;
 664         int spillhdrsize = 0;
 665         int used;
 666         dmu_object_type_t bonustype;
 667         sa_lot_t *lot;
 668         int len_idx;
 669         int spill_used;
 670         boolean_t spilling;
 671 
 672         dmu_buf_will_dirty(hdl->sa_bonus, tx);
 673         bonustype = SA_BONUSTYPE_FROM_DB(hdl->sa_bonus);
 674 
 675         /* first determine bonus header size and sum of all attributes */
 676         hdrsize = sa_find_sizes(sa, attr_desc, attr_count, hdl->sa_bonus,
 677             SA_BONUS, &i, &used, &spilling);
 678 
 679         if (used > SPA_MAXBLOCKSIZE)
 680                 return (SET_ERROR(EFBIG));
 681 
 682         VERIFY(0 == dmu_set_bonus(hdl->sa_bonus, spilling ?
 683             MIN(DN_MAX_BONUSLEN - sizeof (blkptr_t), used + hdrsize) :
 684             used + hdrsize, tx));
 685 
 686         ASSERT((bonustype == DMU_OT_ZNODE && spilling == 0) ||
 687             bonustype == DMU_OT_SA);
 688 
 689         /* setup and size spill buffer when needed */
 690         if (spilling) {
 691                 boolean_t dummy;
 692 
 693                 if (hdl->sa_spill == NULL) {
 694                         VERIFY(dmu_spill_hold_by_bonus(hdl->sa_bonus, NULL,
 695                             &hdl->sa_spill) == 0);
 696                 }
 697                 dmu_buf_will_dirty(hdl->sa_spill, tx);
 698 
 699                 spillhdrsize = sa_find_sizes(sa, &attr_desc[i],
 700                     attr_count - i, hdl->sa_spill, SA_SPILL, &i,
 701                     &spill_used, &dummy);
 702 
 703                 if (spill_used > SPA_MAXBLOCKSIZE)
 704                         return (SET_ERROR(EFBIG));
 705 
 706                 buf_space = hdl->sa_spill->db_size - spillhdrsize;
 707                 if (BUF_SPACE_NEEDED(spill_used, spillhdrsize) >
 708                     hdl->sa_spill->db_size)
 709                         VERIFY(0 == sa_resize_spill(hdl,
 710                             BUF_SPACE_NEEDED(spill_used, spillhdrsize), tx));
 711         }
 712 
 713         /* setup starting pointers to lay down data */
 714         data_start = (void *)((uintptr_t)hdl->sa_bonus->db_data + hdrsize);
 715         sahdr = (sa_hdr_phys_t *)hdl->sa_bonus->db_data;
 716         buftype = SA_BONUS;
 717 
 718         if (spilling)
 719                 buf_space = (sa->sa_force_spill) ?
 720                     0 : SA_BLKPTR_SPACE - hdrsize;
 721         else
 722                 buf_space = hdl->sa_bonus->db_size - hdrsize;
 723 
 724         attrs_start = attrs = kmem_alloc(sizeof (sa_attr_type_t) * attr_count,
 725             KM_SLEEP);
 726         lot_count = 0;
 727 
 728         for (i = 0, len_idx = 0, hash = -1ULL; i != attr_count; i++) {
 729                 uint16_t length;
 730 
 731                 ASSERT(IS_P2ALIGNED(data_start, 8));
 732                 ASSERT(IS_P2ALIGNED(buf_space, 8));
 733                 attrs[i] = attr_desc[i].sa_attr;
 734                 length = SA_REGISTERED_LEN(sa, attrs[i]);
 735                 if (length == 0)
 736                         length = attr_desc[i].sa_length;
 737 
 738                 if (buf_space < length) {  /* switch to spill buffer */
 739                         VERIFY(spilling);
 740                         VERIFY(bonustype == DMU_OT_SA);
 741                         if (buftype == SA_BONUS && !sa->sa_force_spill) {
 742                                 sa_find_layout(hdl->sa_os, hash, attrs_start,
 743                                     lot_count, tx, &lot);
 744                                 SA_SET_HDR(sahdr, lot->lot_num, hdrsize);
 745                         }
 746 
 747                         buftype = SA_SPILL;
 748                         hash = -1ULL;
 749                         len_idx = 0;
 750 
 751                         sahdr = (sa_hdr_phys_t *)hdl->sa_spill->db_data;
 752                         sahdr->sa_magic = SA_MAGIC;
 753                         data_start = (void *)((uintptr_t)sahdr +
 754                             spillhdrsize);
 755                         attrs_start = &attrs[i];
 756                         buf_space = hdl->sa_spill->db_size - spillhdrsize;
 757                         lot_count = 0;
 758                 }
 759                 hash ^= SA_ATTR_HASH(attrs[i]);
 760                 attr_desc[i].sa_addr = data_start;
 761                 attr_desc[i].sa_size = length;
 762                 SA_COPY_DATA(attr_desc[i].sa_data_func, attr_desc[i].sa_data,
 763                     data_start, length);
 764                 if (sa->sa_attr_table[attrs[i]].sa_length == 0) {
 765                         sahdr->sa_lengths[len_idx++] = length;
 766                 }
 767                 data_start = (void *)P2ROUNDUP(((uintptr_t)data_start +
 768                     length), 8);
 769                 buf_space -= P2ROUNDUP(length, 8);
 770                 lot_count++;
 771         }
 772 
 773         sa_find_layout(hdl->sa_os, hash, attrs_start, lot_count, tx, &lot);
 774 
 775         /*
 776          * Verify that old znodes always have layout number 0.
 777          * Must be DMU_OT_SA for arbitrary layouts
 778          */
 779         VERIFY((bonustype == DMU_OT_ZNODE && lot->lot_num == 0) ||
 780             (bonustype == DMU_OT_SA && lot->lot_num > 1));
 781 
 782         if (bonustype == DMU_OT_SA) {
 783                 SA_SET_HDR(sahdr, lot->lot_num,
 784                     buftype == SA_BONUS ? hdrsize : spillhdrsize);
 785         }
 786 
 787         kmem_free(attrs, sizeof (sa_attr_type_t) * attr_count);
 788         if (hdl->sa_bonus_tab) {
 789                 sa_idx_tab_rele(hdl->sa_os, hdl->sa_bonus_tab);
 790                 hdl->sa_bonus_tab = NULL;
 791         }
 792         if (!sa->sa_force_spill)
 793                 VERIFY(0 == sa_build_index(hdl, SA_BONUS));
 794         if (hdl->sa_spill) {
 795                 sa_idx_tab_rele(hdl->sa_os, hdl->sa_spill_tab);
 796                 if (!spilling) {
 797                         /*
 798                          * remove spill block that is no longer needed.
 799                          */
 800                         dmu_buf_rele(hdl->sa_spill, NULL);
 801                         hdl->sa_spill = NULL;
 802                         hdl->sa_spill_tab = NULL;
 803                         VERIFY(0 == dmu_rm_spill(hdl->sa_os,
 804                             sa_handle_object(hdl), tx));
 805                 } else {
 806                         VERIFY(0 == sa_build_index(hdl, SA_SPILL));
 807                 }
 808         }
 809 
 810         return (0);
 811 }
 812 
 813 static void
 814 sa_free_attr_table(sa_os_t *sa)
 815 {
 816         int i;
 817 
 818         if (sa->sa_attr_table == NULL)
 819                 return;
 820 
 821         for (i = 0; i != sa->sa_num_attrs; i++) {
 822                 if (sa->sa_attr_table[i].sa_name)
 823                         kmem_free(sa->sa_attr_table[i].sa_name,
 824                             strlen(sa->sa_attr_table[i].sa_name) + 1);
 825         }
 826 
 827         kmem_free(sa->sa_attr_table,
 828             sizeof (sa_attr_table_t) * sa->sa_num_attrs);
 829 
 830         sa->sa_attr_table = NULL;
 831 }
 832 
 833 static int
 834 sa_attr_table_setup(objset_t *os, sa_attr_reg_t *reg_attrs, int count)
 835 {
 836         sa_os_t *sa = os->os_sa;
 837         uint64_t sa_attr_count = 0;
 838         uint64_t sa_reg_count = 0;
 839         int error = 0;
 840         uint64_t attr_value;
 841         sa_attr_table_t *tb;
 842         zap_cursor_t zc;
 843         zap_attribute_t za;
 844         int registered_count = 0;
 845         int i;
 846         dmu_objset_type_t ostype = dmu_objset_type(os);
 847 
 848         sa->sa_user_table =
 849             kmem_zalloc(count * sizeof (sa_attr_type_t), KM_SLEEP);
 850         sa->sa_user_table_sz = count * sizeof (sa_attr_type_t);
 851 
 852         if (sa->sa_reg_attr_obj != 0) {
 853                 error = zap_count(os, sa->sa_reg_attr_obj,
 854                     &sa_attr_count);
 855 
 856                 /*
 857                  * Make sure we retrieved a count and that it isn't zero
 858                  */
 859                 if (error || (error == 0 && sa_attr_count == 0)) {
 860                         if (error == 0)
 861                                 error = SET_ERROR(EINVAL);
 862                         goto bail;
 863                 }
 864                 sa_reg_count = sa_attr_count;
 865         }
 866 
 867         if (ostype == DMU_OST_ZFS && sa_attr_count == 0)
 868                 sa_attr_count += sa_legacy_attr_count;
 869 
 870         /* Allocate attribute numbers for attributes that aren't registered */
 871         for (i = 0; i != count; i++) {
 872                 boolean_t found = B_FALSE;
 873                 int j;
 874 
 875                 if (ostype == DMU_OST_ZFS) {
 876                         for (j = 0; j != sa_legacy_attr_count; j++) {
 877                                 if (strcmp(reg_attrs[i].sa_name,
 878                                     sa_legacy_attrs[j].sa_name) == 0) {
 879                                         sa->sa_user_table[i] =
 880                                             sa_legacy_attrs[j].sa_attr;
 881                                         found = B_TRUE;
 882                                 }
 883                         }
 884                 }
 885                 if (found)
 886                         continue;
 887 
 888                 if (sa->sa_reg_attr_obj)
 889                         error = zap_lookup(os, sa->sa_reg_attr_obj,
 890                             reg_attrs[i].sa_name, 8, 1, &attr_value);
 891                 else
 892                         error = SET_ERROR(ENOENT);
 893                 switch (error) {
 894                 case ENOENT:
 895                         sa->sa_user_table[i] = (sa_attr_type_t)sa_attr_count;
 896                         sa_attr_count++;
 897                         break;
 898                 case 0:
 899                         sa->sa_user_table[i] = ATTR_NUM(attr_value);
 900                         break;
 901                 default:
 902                         goto bail;
 903                 }
 904         }
 905 
 906         sa->sa_num_attrs = sa_attr_count;
 907         tb = sa->sa_attr_table =
 908             kmem_zalloc(sizeof (sa_attr_table_t) * sa_attr_count, KM_SLEEP);
 909 
 910         /*
 911          * Attribute table is constructed from requested attribute list,
 912          * previously foreign registered attributes, and also the legacy
 913          * ZPL set of attributes.
 914          */
 915 
 916         if (sa->sa_reg_attr_obj) {
 917                 for (zap_cursor_init(&zc, os, sa->sa_reg_attr_obj);
 918                     (error = zap_cursor_retrieve(&zc, &za)) == 0;
 919                     zap_cursor_advance(&zc)) {
 920                         uint64_t value;
 921                         value  = za.za_first_integer;
 922 
 923                         registered_count++;
 924                         tb[ATTR_NUM(value)].sa_attr = ATTR_NUM(value);
 925                         tb[ATTR_NUM(value)].sa_length = ATTR_LENGTH(value);
 926                         tb[ATTR_NUM(value)].sa_byteswap = ATTR_BSWAP(value);
 927                         tb[ATTR_NUM(value)].sa_registered = B_TRUE;
 928 
 929                         if (tb[ATTR_NUM(value)].sa_name) {
 930                                 continue;
 931                         }
 932                         tb[ATTR_NUM(value)].sa_name =
 933                             kmem_zalloc(strlen(za.za_name) +1, KM_SLEEP);
 934                         (void) strlcpy(tb[ATTR_NUM(value)].sa_name, za.za_name,
 935                             strlen(za.za_name) +1);
 936                 }
 937                 zap_cursor_fini(&zc);
 938                 /*
 939                  * Make sure we processed the correct number of registered
 940                  * attributes
 941                  */
 942                 if (registered_count != sa_reg_count) {
 943                         ASSERT(error != 0);
 944                         goto bail;
 945                 }
 946 
 947         }
 948 
 949         if (ostype == DMU_OST_ZFS) {
 950                 for (i = 0; i != sa_legacy_attr_count; i++) {
 951                         if (tb[i].sa_name)
 952                                 continue;
 953                         tb[i].sa_attr = sa_legacy_attrs[i].sa_attr;
 954                         tb[i].sa_length = sa_legacy_attrs[i].sa_length;
 955                         tb[i].sa_byteswap = sa_legacy_attrs[i].sa_byteswap;
 956                         tb[i].sa_registered = B_FALSE;
 957                         tb[i].sa_name =
 958                             kmem_zalloc(strlen(sa_legacy_attrs[i].sa_name) +1,
 959                             KM_SLEEP);
 960                         (void) strlcpy(tb[i].sa_name,
 961                             sa_legacy_attrs[i].sa_name,
 962                             strlen(sa_legacy_attrs[i].sa_name) + 1);
 963                 }
 964         }
 965 
 966         for (i = 0; i != count; i++) {
 967                 sa_attr_type_t attr_id;
 968 
 969                 attr_id = sa->sa_user_table[i];
 970                 if (tb[attr_id].sa_name)
 971                         continue;
 972 
 973                 tb[attr_id].sa_length = reg_attrs[i].sa_length;
 974                 tb[attr_id].sa_byteswap = reg_attrs[i].sa_byteswap;
 975                 tb[attr_id].sa_attr = attr_id;
 976                 tb[attr_id].sa_name =
 977                     kmem_zalloc(strlen(reg_attrs[i].sa_name) + 1, KM_SLEEP);
 978                 (void) strlcpy(tb[attr_id].sa_name, reg_attrs[i].sa_name,
 979                     strlen(reg_attrs[i].sa_name) + 1);
 980         }
 981 
 982         sa->sa_need_attr_registration =
 983             (sa_attr_count != registered_count);
 984 
 985         return (0);
 986 bail:
 987         kmem_free(sa->sa_user_table, count * sizeof (sa_attr_type_t));
 988         sa->sa_user_table = NULL;
 989         sa_free_attr_table(sa);
 990         return ((error != 0) ? error : EINVAL);
 991 }
 992 
 993 int
 994 sa_setup(objset_t *os, uint64_t sa_obj, sa_attr_reg_t *reg_attrs, int count,
 995     sa_attr_type_t **user_table)
 996 {
 997         zap_cursor_t zc;
 998         zap_attribute_t za;
 999         sa_os_t *sa;
1000         dmu_objset_type_t ostype = dmu_objset_type(os);
1001         sa_attr_type_t *tb;
1002         int error;
1003 
1004         mutex_enter(&os->os_user_ptr_lock);
1005         if (os->os_sa) {
1006                 mutex_enter(&os->os_sa->sa_lock);
1007                 mutex_exit(&os->os_user_ptr_lock);
1008                 tb = os->os_sa->sa_user_table;
1009                 mutex_exit(&os->os_sa->sa_lock);
1010                 *user_table = tb;
1011                 return (0);
1012         }
1013 
1014         sa = kmem_zalloc(sizeof (sa_os_t), KM_SLEEP);
1015         mutex_init(&sa->sa_lock, NULL, MUTEX_DEFAULT, NULL);
1016         sa->sa_master_obj = sa_obj;
1017 
1018         os->os_sa = sa;
1019         mutex_enter(&sa->sa_lock);
1020         mutex_exit(&os->os_user_ptr_lock);
1021         avl_create(&sa->sa_layout_num_tree, layout_num_compare,
1022             sizeof (sa_lot_t), offsetof(sa_lot_t, lot_num_node));
1023         avl_create(&sa->sa_layout_hash_tree, layout_hash_compare,
1024             sizeof (sa_lot_t), offsetof(sa_lot_t, lot_hash_node));
1025 
1026         if (sa_obj) {
1027                 error = zap_lookup(os, sa_obj, SA_LAYOUTS,
1028                     8, 1, &sa->sa_layout_attr_obj);
1029                 if (error != 0 && error != ENOENT)
1030                         goto fail;
1031                 error = zap_lookup(os, sa_obj, SA_REGISTRY,
1032                     8, 1, &sa->sa_reg_attr_obj);
1033                 if (error != 0 && error != ENOENT)
1034                         goto fail;
1035         }
1036 
1037         if ((error = sa_attr_table_setup(os, reg_attrs, count)) != 0)
1038                 goto fail;
1039 
1040         if (sa->sa_layout_attr_obj != 0) {
1041                 uint64_t layout_count;
1042 
1043                 error = zap_count(os, sa->sa_layout_attr_obj,
1044                     &layout_count);
1045 
1046                 /*
1047                  * Layout number count should be > 0
1048                  */
1049                 if (error || (error == 0 && layout_count == 0)) {
1050                         if (error == 0)
1051                                 error = SET_ERROR(EINVAL);
1052                         goto fail;
1053                 }
1054 
1055                 for (zap_cursor_init(&zc, os, sa->sa_layout_attr_obj);
1056                     (error = zap_cursor_retrieve(&zc, &za)) == 0;
1057                     zap_cursor_advance(&zc)) {
1058                         sa_attr_type_t *lot_attrs;
1059                         uint64_t lot_num;
1060 
1061                         lot_attrs = kmem_zalloc(sizeof (sa_attr_type_t) *
1062                             za.za_num_integers, KM_SLEEP);
1063 
1064                         if ((error = (zap_lookup(os, sa->sa_layout_attr_obj,
1065                             za.za_name, 2, za.za_num_integers,
1066                             lot_attrs))) != 0) {
1067                                 kmem_free(lot_attrs, sizeof (sa_attr_type_t) *
1068                                     za.za_num_integers);
1069                                 break;
1070                         }
1071                         VERIFY(ddi_strtoull(za.za_name, NULL, 10,
1072                             (unsigned long long *)&lot_num) == 0);
1073 
1074                         (void) sa_add_layout_entry(os, lot_attrs,
1075                             za.za_num_integers, lot_num,
1076                             sa_layout_info_hash(lot_attrs,
1077                             za.za_num_integers), B_FALSE, NULL);
1078                         kmem_free(lot_attrs, sizeof (sa_attr_type_t) *
1079                             za.za_num_integers);
1080                 }
1081                 zap_cursor_fini(&zc);
1082 
1083                 /*
1084                  * Make sure layout count matches number of entries added
1085                  * to AVL tree
1086                  */
1087                 if (avl_numnodes(&sa->sa_layout_num_tree) != layout_count) {
1088                         ASSERT(error != 0);
1089                         goto fail;
1090                 }
1091         }
1092 
1093         /* Add special layout number for old ZNODES */
1094         if (ostype == DMU_OST_ZFS) {
1095                 (void) sa_add_layout_entry(os, sa_legacy_zpl_layout,
1096                     sa_legacy_attr_count, 0,
1097                     sa_layout_info_hash(sa_legacy_zpl_layout,
1098                     sa_legacy_attr_count), B_FALSE, NULL);
1099 
1100                 (void) sa_add_layout_entry(os, sa_dummy_zpl_layout, 0, 1,
1101                     0, B_FALSE, NULL);
1102         }
1103         *user_table = os->os_sa->sa_user_table;
1104         mutex_exit(&sa->sa_lock);
1105         return (0);
1106 fail:
1107         os->os_sa = NULL;
1108         sa_free_attr_table(sa);
1109         if (sa->sa_user_table)
1110                 kmem_free(sa->sa_user_table, sa->sa_user_table_sz);
1111         mutex_exit(&sa->sa_lock);
1112         kmem_free(sa, sizeof (sa_os_t));
1113         return ((error == ECKSUM) ? EIO : error);
1114 }
1115 
1116 void
1117 sa_tear_down(objset_t *os)
1118 {
1119         sa_os_t *sa = os->os_sa;
1120         sa_lot_t *layout;
1121         void *cookie;
1122 
1123         kmem_free(sa->sa_user_table, sa->sa_user_table_sz);
1124 
1125         /* Free up attr table */
1126 
1127         sa_free_attr_table(sa);
1128 
1129         cookie = NULL;
1130         while (layout = avl_destroy_nodes(&sa->sa_layout_hash_tree, &cookie)) {
1131                 sa_idx_tab_t *tab;
1132                 while (tab = list_head(&layout->lot_idx_tab)) {
1133                         ASSERT(refcount_count(&tab->sa_refcount));
1134                         sa_idx_tab_rele(os, tab);
1135                 }
1136         }
1137 
1138         cookie = NULL;
1139         while (layout = avl_destroy_nodes(&sa->sa_layout_num_tree, &cookie)) {
1140                 kmem_free(layout->lot_attrs,
1141                     sizeof (sa_attr_type_t) * layout->lot_attr_count);
1142                 kmem_free(layout, sizeof (sa_lot_t));
1143         }
1144 
1145         avl_destroy(&sa->sa_layout_hash_tree);
1146         avl_destroy(&sa->sa_layout_num_tree);
1147 
1148         kmem_free(sa, sizeof (sa_os_t));
1149         os->os_sa = NULL;
1150 }
1151 
1152 void
1153 sa_build_idx_tab(void *hdr, void *attr_addr, sa_attr_type_t attr,
1154     uint16_t length, int length_idx, boolean_t var_length, void *userp)
1155 {
1156         sa_idx_tab_t *idx_tab = userp;
1157 
1158         if (var_length) {
1159                 ASSERT(idx_tab->sa_variable_lengths);
1160                 idx_tab->sa_variable_lengths[length_idx] = length;
1161         }
1162         TOC_ATTR_ENCODE(idx_tab->sa_idx_tab[attr], length_idx,
1163             (uint32_t)((uintptr_t)attr_addr - (uintptr_t)hdr));
1164 }
1165 
1166 static void
1167 sa_attr_iter(objset_t *os, sa_hdr_phys_t *hdr, dmu_object_type_t type,
1168     sa_iterfunc_t func, sa_lot_t *tab, void *userp)
1169 {
1170         void *data_start;
1171         sa_lot_t *tb = tab;
1172         sa_lot_t search;
1173         avl_index_t loc;
1174         sa_os_t *sa = os->os_sa;
1175         int i;
1176         uint16_t *length_start = NULL;
1177         uint8_t length_idx = 0;
1178 
1179         if (tab == NULL) {
1180                 search.lot_num = SA_LAYOUT_NUM(hdr, type);
1181                 tb = avl_find(&sa->sa_layout_num_tree, &search, &loc);
1182                 ASSERT(tb);
1183         }
1184 
1185         if (IS_SA_BONUSTYPE(type)) {
1186                 data_start = (void *)P2ROUNDUP(((uintptr_t)hdr +
1187                     offsetof(sa_hdr_phys_t, sa_lengths) +
1188                     (sizeof (uint16_t) * tb->lot_var_sizes)), 8);
1189                 length_start = hdr->sa_lengths;
1190         } else {
1191                 data_start = hdr;
1192         }
1193 
1194         for (i = 0; i != tb->lot_attr_count; i++) {
1195                 int attr_length, reg_length;
1196                 uint8_t idx_len;
1197 
1198                 reg_length = sa->sa_attr_table[tb->lot_attrs[i]].sa_length;
1199                 if (reg_length) {
1200                         attr_length = reg_length;
1201                         idx_len = 0;
1202                 } else {
1203                         attr_length = length_start[length_idx];
1204                         idx_len = length_idx++;
1205                 }
1206 
1207                 func(hdr, data_start, tb->lot_attrs[i], attr_length,
1208                     idx_len, reg_length == 0 ? B_TRUE : B_FALSE, userp);
1209 
1210                 data_start = (void *)P2ROUNDUP(((uintptr_t)data_start +
1211                     attr_length), 8);
1212         }
1213 }
1214 
1215 /*ARGSUSED*/
1216 void
1217 sa_byteswap_cb(void *hdr, void *attr_addr, sa_attr_type_t attr,
1218     uint16_t length, int length_idx, boolean_t variable_length, void *userp)
1219 {
1220         sa_handle_t *hdl = userp;
1221         sa_os_t *sa = hdl->sa_os->os_sa;
1222 
1223         sa_bswap_table[sa->sa_attr_table[attr].sa_byteswap](attr_addr, length);
1224 }
1225 
1226 void
1227 sa_byteswap(sa_handle_t *hdl, sa_buf_type_t buftype)
1228 {
1229         sa_hdr_phys_t *sa_hdr_phys = SA_GET_HDR(hdl, buftype);
1230         dmu_buf_impl_t *db;
1231         sa_os_t *sa = hdl->sa_os->os_sa;
1232         int num_lengths = 1;
1233         int i;
1234 
1235         ASSERT(MUTEX_HELD(&sa->sa_lock));
1236         if (sa_hdr_phys->sa_magic == SA_MAGIC)
1237                 return;
1238 
1239         db = SA_GET_DB(hdl, buftype);
1240 
1241         if (buftype == SA_SPILL) {
1242                 arc_release(db->db_buf, NULL);
1243                 arc_buf_thaw(db->db_buf);
1244         }
1245 
1246         sa_hdr_phys->sa_magic = BSWAP_32(sa_hdr_phys->sa_magic);
1247         sa_hdr_phys->sa_layout_info = BSWAP_16(sa_hdr_phys->sa_layout_info);
1248 
1249         /*
1250          * Determine number of variable lenghts in header
1251          * The standard 8 byte header has one for free and a
1252          * 16 byte header would have 4 + 1;
1253          */
1254         if (SA_HDR_SIZE(sa_hdr_phys) > 8)
1255                 num_lengths += (SA_HDR_SIZE(sa_hdr_phys) - 8) >> 1;
1256         for (i = 0; i != num_lengths; i++)
1257                 sa_hdr_phys->sa_lengths[i] =
1258                     BSWAP_16(sa_hdr_phys->sa_lengths[i]);
1259 
1260         sa_attr_iter(hdl->sa_os, sa_hdr_phys, DMU_OT_SA,
1261             sa_byteswap_cb, NULL, hdl);
1262 
1263         if (buftype == SA_SPILL)
1264                 arc_buf_freeze(((dmu_buf_impl_t *)hdl->sa_spill)->db_buf);
1265 }
1266 
1267 static int
1268 sa_build_index(sa_handle_t *hdl, sa_buf_type_t buftype)
1269 {
1270         sa_hdr_phys_t *sa_hdr_phys;
1271         dmu_buf_impl_t *db = SA_GET_DB(hdl, buftype);
1272         dmu_object_type_t bonustype = SA_BONUSTYPE_FROM_DB(db);
1273         sa_os_t *sa = hdl->sa_os->os_sa;
1274         sa_idx_tab_t *idx_tab;
1275 
1276         sa_hdr_phys = SA_GET_HDR(hdl, buftype);
1277 
1278         mutex_enter(&sa->sa_lock);
1279 
1280         /* Do we need to byteswap? */
1281 
1282         /* only check if not old znode */
1283         if (IS_SA_BONUSTYPE(bonustype) && sa_hdr_phys->sa_magic != SA_MAGIC &&
1284             sa_hdr_phys->sa_magic != 0) {
1285                 VERIFY(BSWAP_32(sa_hdr_phys->sa_magic) == SA_MAGIC);
1286                 sa_byteswap(hdl, buftype);
1287         }
1288 
1289         idx_tab = sa_find_idx_tab(hdl->sa_os, bonustype, sa_hdr_phys);
1290 
1291         if (buftype == SA_BONUS)
1292                 hdl->sa_bonus_tab = idx_tab;
1293         else
1294                 hdl->sa_spill_tab = idx_tab;
1295 
1296         mutex_exit(&sa->sa_lock);
1297         return (0);
1298 }
1299 
1300 /*ARGSUSED*/
1301 void
1302 sa_evict(dmu_buf_t *db, void *sap)
1303 {
1304         panic("evicting sa dbuf %p\n", (void *)db);
1305 }
1306 
1307 static void
1308 sa_idx_tab_rele(objset_t *os, void *arg)
1309 {
1310         sa_os_t *sa = os->os_sa;
1311         sa_idx_tab_t *idx_tab = arg;
1312 
1313         if (idx_tab == NULL)
1314                 return;
1315 
1316         mutex_enter(&sa->sa_lock);
1317         if (refcount_remove(&idx_tab->sa_refcount, NULL) == 0) {
1318                 list_remove(&idx_tab->sa_layout->lot_idx_tab, idx_tab);
1319                 if (idx_tab->sa_variable_lengths)
1320                         kmem_free(idx_tab->sa_variable_lengths,
1321                             sizeof (uint16_t) *
1322                             idx_tab->sa_layout->lot_var_sizes);
1323                 refcount_destroy(&idx_tab->sa_refcount);
1324                 kmem_free(idx_tab->sa_idx_tab,
1325                     sizeof (uint32_t) * sa->sa_num_attrs);
1326                 kmem_free(idx_tab, sizeof (sa_idx_tab_t));
1327         }
1328         mutex_exit(&sa->sa_lock);
1329 }
1330 
1331 static void
1332 sa_idx_tab_hold(objset_t *os, sa_idx_tab_t *idx_tab)
1333 {
1334         sa_os_t *sa = os->os_sa;
1335 
1336         ASSERT(MUTEX_HELD(&sa->sa_lock));
1337         (void) refcount_add(&idx_tab->sa_refcount, NULL);
1338 }
1339 
1340 void
1341 sa_handle_destroy(sa_handle_t *hdl)
1342 {
1343         mutex_enter(&hdl->sa_lock);
1344         (void) dmu_buf_update_user((dmu_buf_t *)hdl->sa_bonus, hdl,
1345             NULL, NULL, NULL);
1346 
1347         if (hdl->sa_bonus_tab) {
1348                 sa_idx_tab_rele(hdl->sa_os, hdl->sa_bonus_tab);
1349                 hdl->sa_bonus_tab = NULL;
1350         }
1351         if (hdl->sa_spill_tab) {
1352                 sa_idx_tab_rele(hdl->sa_os, hdl->sa_spill_tab);
1353                 hdl->sa_spill_tab = NULL;
1354         }
1355 
1356         dmu_buf_rele(hdl->sa_bonus, NULL);
1357 
1358         if (hdl->sa_spill)
1359                 dmu_buf_rele((dmu_buf_t *)hdl->sa_spill, NULL);
1360         mutex_exit(&hdl->sa_lock);
1361 
1362         kmem_cache_free(sa_cache, hdl);
1363 }
1364 
1365 int
1366 sa_handle_get_from_db(objset_t *os, dmu_buf_t *db, void *userp,
1367     sa_handle_type_t hdl_type, sa_handle_t **handlepp)
1368 {
1369         int error = 0;
1370         dmu_object_info_t doi;
1371         sa_handle_t *handle;
1372 
1373 #ifdef ZFS_DEBUG
1374         dmu_object_info_from_db(db, &doi);
1375         ASSERT(doi.doi_bonus_type == DMU_OT_SA ||
1376             doi.doi_bonus_type == DMU_OT_ZNODE);
1377 #endif
1378         /* find handle, if it exists */
1379         /* if one doesn't exist then create a new one, and initialize it */
1380 
1381         handle = (hdl_type == SA_HDL_SHARED) ? dmu_buf_get_user(db) : NULL;
1382         if (handle == NULL) {
1383                 sa_handle_t *newhandle;
1384                 handle = kmem_cache_alloc(sa_cache, KM_SLEEP);
1385                 handle->sa_userp = userp;
1386                 handle->sa_bonus = db;
1387                 handle->sa_os = os;
1388                 handle->sa_spill = NULL;
1389 
1390                 error = sa_build_index(handle, SA_BONUS);
1391                 newhandle = (hdl_type == SA_HDL_SHARED) ?
1392                     dmu_buf_set_user_ie(db, handle,
1393                     NULL, sa_evict) : NULL;
1394 
1395                 if (newhandle != NULL) {
1396                         kmem_cache_free(sa_cache, handle);
1397                         handle = newhandle;
1398                 }
1399         }
1400         *handlepp = handle;
1401 
1402         return (error);
1403 }
1404 
1405 int
1406 sa_handle_get(objset_t *objset, uint64_t objid, void *userp,
1407     sa_handle_type_t hdl_type, sa_handle_t **handlepp)
1408 {
1409         dmu_buf_t *db;
1410         int error;
1411 
1412         if (error = dmu_bonus_hold(objset, objid, NULL, &db))
1413                 return (error);
1414 
1415         return (sa_handle_get_from_db(objset, db, userp, hdl_type,
1416             handlepp));
1417 }
1418 
1419 int
1420 sa_buf_hold(objset_t *objset, uint64_t obj_num, void *tag, dmu_buf_t **db)
1421 {
1422         return (dmu_bonus_hold(objset, obj_num, tag, db));
1423 }
1424 
1425 void
1426 sa_buf_rele(dmu_buf_t *db, void *tag)
1427 {
1428         dmu_buf_rele(db, tag);
1429 }
1430 
1431 int
1432 sa_lookup_impl(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count)
1433 {
1434         ASSERT(hdl);
1435         ASSERT(MUTEX_HELD(&hdl->sa_lock));
1436         return (sa_attr_op(hdl, bulk, count, SA_LOOKUP, NULL));
1437 }
1438 
1439 int
1440 sa_lookup(sa_handle_t *hdl, sa_attr_type_t attr, void *buf, uint32_t buflen)
1441 {
1442         int error;
1443         sa_bulk_attr_t bulk;
1444 
1445         bulk.sa_attr = attr;
1446         bulk.sa_data = buf;
1447         bulk.sa_length = buflen;
1448         bulk.sa_data_func = NULL;
1449 
1450         ASSERT(hdl);
1451         mutex_enter(&hdl->sa_lock);
1452         error = sa_lookup_impl(hdl, &bulk, 1);
1453         mutex_exit(&hdl->sa_lock);
1454         return (error);
1455 }
1456 
1457 #ifdef _KERNEL
1458 int
1459 sa_lookup_uio(sa_handle_t *hdl, sa_attr_type_t attr, uio_t *uio)
1460 {
1461         int error;
1462         sa_bulk_attr_t bulk;
1463 
1464         bulk.sa_data = NULL;
1465         bulk.sa_attr = attr;
1466         bulk.sa_data_func = NULL;
1467 
1468         ASSERT(hdl);
1469 
1470         mutex_enter(&hdl->sa_lock);
1471         if ((error = sa_attr_op(hdl, &bulk, 1, SA_LOOKUP, NULL)) == 0) {
1472                 error = uiomove((void *)bulk.sa_addr, MIN(bulk.sa_size,
1473                     uio->uio_resid), UIO_READ, uio);
1474         }
1475         mutex_exit(&hdl->sa_lock);
1476         return (error);
1477 
1478 }
1479 #endif
1480 
1481 void *
1482 sa_find_idx_tab(objset_t *os, dmu_object_type_t bonustype, void *data)
1483 {
1484         sa_idx_tab_t *idx_tab;
1485         sa_hdr_phys_t *hdr = (sa_hdr_phys_t *)data;
1486         sa_os_t *sa = os->os_sa;
1487         sa_lot_t *tb, search;
1488         avl_index_t loc;
1489 
1490         /*
1491          * Deterimine layout number.  If SA node and header == 0 then
1492          * force the index table to the dummy "1" empty layout.
1493          *
1494          * The layout number would only be zero for a newly created file
1495          * that has not added any attributes yet, or with crypto enabled which
1496          * doesn't write any attributes to the bonus buffer.
1497          */
1498 
1499         search.lot_num = SA_LAYOUT_NUM(hdr, bonustype);
1500 
1501         tb = avl_find(&sa->sa_layout_num_tree, &search, &loc);
1502 
1503         /* Verify header size is consistent with layout information */
1504         ASSERT(tb);
1505         ASSERT(IS_SA_BONUSTYPE(bonustype) &&
1506             SA_HDR_SIZE_MATCH_LAYOUT(hdr, tb) || !IS_SA_BONUSTYPE(bonustype) ||
1507             (IS_SA_BONUSTYPE(bonustype) && hdr->sa_layout_info == 0));
1508 
1509         /*
1510          * See if any of the already existing TOC entries can be reused?
1511          */
1512 
1513         for (idx_tab = list_head(&tb->lot_idx_tab); idx_tab;
1514             idx_tab = list_next(&tb->lot_idx_tab, idx_tab)) {
1515                 boolean_t valid_idx = B_TRUE;
1516                 int i;
1517 
1518                 if (tb->lot_var_sizes != 0 &&
1519                     idx_tab->sa_variable_lengths != NULL) {
1520                         for (i = 0; i != tb->lot_var_sizes; i++) {
1521                                 if (hdr->sa_lengths[i] !=
1522                                     idx_tab->sa_variable_lengths[i]) {
1523                                         valid_idx = B_FALSE;
1524                                         break;
1525                                 }
1526                         }
1527                 }
1528                 if (valid_idx) {
1529                         sa_idx_tab_hold(os, idx_tab);
1530                         return (idx_tab);
1531                 }
1532         }
1533 
1534         /* No such luck, create a new entry */
1535         idx_tab = kmem_zalloc(sizeof (sa_idx_tab_t), KM_SLEEP);
1536         idx_tab->sa_idx_tab =
1537             kmem_zalloc(sizeof (uint32_t) * sa->sa_num_attrs, KM_SLEEP);
1538         idx_tab->sa_layout = tb;
1539         refcount_create(&idx_tab->sa_refcount);
1540         if (tb->lot_var_sizes)
1541                 idx_tab->sa_variable_lengths = kmem_alloc(sizeof (uint16_t) *
1542                     tb->lot_var_sizes, KM_SLEEP);
1543 
1544         sa_attr_iter(os, hdr, bonustype, sa_build_idx_tab,
1545             tb, idx_tab);
1546         sa_idx_tab_hold(os, idx_tab);   /* one hold for consumer */
1547         sa_idx_tab_hold(os, idx_tab);   /* one for layout */
1548         list_insert_tail(&tb->lot_idx_tab, idx_tab);
1549         return (idx_tab);
1550 }
1551 
1552 void
1553 sa_default_locator(void **dataptr, uint32_t *len, uint32_t total_len,
1554     boolean_t start, void *userdata)
1555 {
1556         ASSERT(start);
1557 
1558         *dataptr = userdata;
1559         *len = total_len;
1560 }
1561 
1562 static void
1563 sa_attr_register_sync(sa_handle_t *hdl, dmu_tx_t *tx)
1564 {
1565         uint64_t attr_value = 0;
1566         sa_os_t *sa = hdl->sa_os->os_sa;
1567         sa_attr_table_t *tb = sa->sa_attr_table;
1568         int i;
1569 
1570         mutex_enter(&sa->sa_lock);
1571 
1572         if (!sa->sa_need_attr_registration || sa->sa_master_obj == NULL) {
1573                 mutex_exit(&sa->sa_lock);
1574                 return;
1575         }
1576 
1577         if (sa->sa_reg_attr_obj == NULL) {
1578                 sa->sa_reg_attr_obj = zap_create_link(hdl->sa_os,
1579                     DMU_OT_SA_ATTR_REGISTRATION,
1580                     sa->sa_master_obj, SA_REGISTRY, tx);
1581         }
1582         for (i = 0; i != sa->sa_num_attrs; i++) {
1583                 if (sa->sa_attr_table[i].sa_registered)
1584                         continue;
1585                 ATTR_ENCODE(attr_value, tb[i].sa_attr, tb[i].sa_length,
1586                     tb[i].sa_byteswap);
1587                 VERIFY(0 == zap_update(hdl->sa_os, sa->sa_reg_attr_obj,
1588                     tb[i].sa_name, 8, 1, &attr_value, tx));
1589                 tb[i].sa_registered = B_TRUE;
1590         }
1591         sa->sa_need_attr_registration = B_FALSE;
1592         mutex_exit(&sa->sa_lock);
1593 }
1594 
1595 /*
1596  * Replace all attributes with attributes specified in template.
1597  * If dnode had a spill buffer then those attributes will be
1598  * also be replaced, possibly with just an empty spill block
1599  *
1600  * This interface is intended to only be used for bulk adding of
1601  * attributes for a new file.  It will also be used by the ZPL
1602  * when converting and old formatted znode to native SA support.
1603  */
1604 int
1605 sa_replace_all_by_template_locked(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc,
1606     int attr_count, dmu_tx_t *tx)
1607 {
1608         sa_os_t *sa = hdl->sa_os->os_sa;
1609 
1610         if (sa->sa_need_attr_registration)
1611                 sa_attr_register_sync(hdl, tx);
1612         return (sa_build_layouts(hdl, attr_desc, attr_count, tx));
1613 }
1614 
1615 int
1616 sa_replace_all_by_template(sa_handle_t *hdl, sa_bulk_attr_t *attr_desc,
1617     int attr_count, dmu_tx_t *tx)
1618 {
1619         int error;
1620 
1621         mutex_enter(&hdl->sa_lock);
1622         error = sa_replace_all_by_template_locked(hdl, attr_desc,
1623             attr_count, tx);
1624         mutex_exit(&hdl->sa_lock);
1625         return (error);
1626 }
1627 
1628 /*
1629  * add/remove/replace a single attribute and then rewrite the entire set
1630  * of attributes.
1631  */
1632 static int
1633 sa_modify_attrs(sa_handle_t *hdl, sa_attr_type_t newattr,
1634     sa_data_op_t action, sa_data_locator_t *locator, void *datastart,
1635     uint16_t buflen, dmu_tx_t *tx)
1636 {
1637         sa_os_t *sa = hdl->sa_os->os_sa;
1638         dmu_buf_impl_t *db = (dmu_buf_impl_t *)hdl->sa_bonus;
1639         dnode_t *dn;
1640         sa_bulk_attr_t *attr_desc;
1641         void *old_data[2];
1642         int bonus_attr_count = 0;
1643         int bonus_data_size = 0;
1644         int spill_data_size = 0;
1645         int spill_attr_count = 0;
1646         int error;
1647         uint16_t length;
1648         int i, j, k, length_idx;
1649         sa_hdr_phys_t *hdr;
1650         sa_idx_tab_t *idx_tab;
1651         int attr_count;
1652         int count;
1653 
1654         ASSERT(MUTEX_HELD(&hdl->sa_lock));
1655 
1656         /* First make of copy of the old data */
1657 
1658         DB_DNODE_ENTER(db);
1659         dn = DB_DNODE(db);
1660         if (dn->dn_bonuslen != 0) {
1661                 bonus_data_size = hdl->sa_bonus->db_size;
1662                 old_data[0] = kmem_alloc(bonus_data_size, KM_SLEEP);
1663                 bcopy(hdl->sa_bonus->db_data, old_data[0],
1664                     hdl->sa_bonus->db_size);
1665                 bonus_attr_count = hdl->sa_bonus_tab->sa_layout->lot_attr_count;
1666         } else {
1667                 old_data[0] = NULL;
1668         }
1669         DB_DNODE_EXIT(db);
1670 
1671         /* Bring spill buffer online if it isn't currently */
1672 
1673         if ((error = sa_get_spill(hdl)) == 0) {
1674                 spill_data_size = hdl->sa_spill->db_size;
1675                 old_data[1] = kmem_alloc(spill_data_size, KM_SLEEP);
1676                 bcopy(hdl->sa_spill->db_data, old_data[1],
1677                     hdl->sa_spill->db_size);
1678                 spill_attr_count =
1679                     hdl->sa_spill_tab->sa_layout->lot_attr_count;
1680         } else if (error && error != ENOENT) {
1681                 if (old_data[0])
1682                         kmem_free(old_data[0], bonus_data_size);
1683                 return (error);
1684         } else {
1685                 old_data[1] = NULL;
1686         }
1687 
1688         /* build descriptor of all attributes */
1689 
1690         attr_count = bonus_attr_count + spill_attr_count;
1691         if (action == SA_ADD)
1692                 attr_count++;
1693         else if (action == SA_REMOVE)
1694                 attr_count--;
1695 
1696         attr_desc = kmem_zalloc(sizeof (sa_bulk_attr_t) * attr_count, KM_SLEEP);
1697 
1698         /*
1699          * loop through bonus and spill buffer if it exists, and
1700          * build up new attr_descriptor to reset the attributes
1701          */
1702         k = j = 0;
1703         count = bonus_attr_count;
1704         hdr = SA_GET_HDR(hdl, SA_BONUS);
1705         idx_tab = SA_IDX_TAB_GET(hdl, SA_BONUS);
1706         for (; k != 2; k++) {
1707                 /* iterate over each attribute in layout */
1708                 for (i = 0, length_idx = 0; i != count; i++) {
1709                         sa_attr_type_t attr;
1710 
1711                         attr = idx_tab->sa_layout->lot_attrs[i];
1712                         if (attr == newattr) {
1713                                 if (action == SA_REMOVE) {
1714                                         j++;
1715                                         continue;
1716                                 }
1717                                 ASSERT(SA_REGISTERED_LEN(sa, attr) == 0);
1718                                 ASSERT(action == SA_REPLACE);
1719                                 SA_ADD_BULK_ATTR(attr_desc, j, attr,
1720                                     locator, datastart, buflen);
1721                         } else {
1722                                 length = SA_REGISTERED_LEN(sa, attr);
1723                                 if (length == 0) {
1724                                         length = hdr->sa_lengths[length_idx++];
1725                                 }
1726 
1727                                 SA_ADD_BULK_ATTR(attr_desc, j, attr,
1728                                     NULL, (void *)
1729                                     (TOC_OFF(idx_tab->sa_idx_tab[attr]) +
1730                                     (uintptr_t)old_data[k]), length);
1731                         }
1732                 }
1733                 if (k == 0 && hdl->sa_spill) {
1734                         hdr = SA_GET_HDR(hdl, SA_SPILL);
1735                         idx_tab = SA_IDX_TAB_GET(hdl, SA_SPILL);
1736                         count = spill_attr_count;
1737                 } else {
1738                         break;
1739                 }
1740         }
1741         if (action == SA_ADD) {
1742                 length = SA_REGISTERED_LEN(sa, newattr);
1743                 if (length == 0) {
1744                         length = buflen;
1745                 }
1746                 SA_ADD_BULK_ATTR(attr_desc, j, newattr, locator,
1747                     datastart, buflen);
1748         }
1749 
1750         error = sa_build_layouts(hdl, attr_desc, attr_count, tx);
1751 
1752         if (old_data[0])
1753                 kmem_free(old_data[0], bonus_data_size);
1754         if (old_data[1])
1755                 kmem_free(old_data[1], spill_data_size);
1756         kmem_free(attr_desc, sizeof (sa_bulk_attr_t) * attr_count);
1757 
1758         return (error);
1759 }
1760 
1761 static int
1762 sa_bulk_update_impl(sa_handle_t *hdl, sa_bulk_attr_t *bulk, int count,
1763     dmu_tx_t *tx)
1764 {
1765         int error;
1766         sa_os_t *sa = hdl->sa_os->os_sa;
1767         dmu_object_type_t bonustype;
1768 
1769         bonustype = SA_BONUSTYPE_FROM_DB(SA_GET_DB(hdl, SA_BONUS));
1770 
1771         ASSERT(hdl);
1772         ASSERT(MUTEX_HELD(&hdl->sa_lock));
1773 
1774         /* sync out registration table if necessary */
1775         if (sa->sa_need_attr_registration)
1776                 sa_attr_register_sync(hdl, tx);
1777 
1778         error = sa_attr_op(hdl, bulk, count, SA_UPDATE, tx);
1779         if (error == 0 && !IS_SA_BONUSTYPE(bonustype) && sa->sa_update_cb)
1780                 sa->sa_update_cb(hdl, tx);
1781 
1782         return (error);
1783 }
1784 
1785 /*
1786  * update or add new attribute
1787  */
1788 int
1789 sa_update(sa_handle_t *hdl, sa_attr_type_t type,
1790     void *buf, uint32_t buflen, dmu_tx_t *tx)
1791 {
1792         int error;
1793         sa_bulk_attr_t bulk;
1794 
1795         bulk.sa_attr = type;
1796         bulk.sa_data_func = NULL;
1797         bulk.sa_length = buflen;
1798         bulk.sa_data = buf;
1799 
1800         mutex_enter(&hdl->sa_lock);
1801         error = sa_bulk_update_impl(hdl, &bulk, 1, tx);
1802         mutex_exit(&hdl->sa_lock);
1803         return (error);
1804 }
1805 
1806 int
1807 sa_update_from_cb(sa_handle_t *hdl, sa_attr_type_t attr,
1808     uint32_t buflen, sa_data_locator_t *locator, void *userdata, dmu_tx_t *tx)
1809 {
1810         int error;
1811         sa_bulk_attr_t bulk;
1812 
1813         bulk.sa_attr = attr;
1814         bulk.sa_data = userdata;
1815         bulk.sa_data_func = locator;
1816         bulk.sa_length = buflen;
1817 
1818         mutex_enter(&hdl->sa_lock);
1819         error = sa_bulk_update_impl(hdl, &bulk, 1, tx);
1820         mutex_exit(&hdl->sa_lock);
1821         return (error);
1822 }
1823 
1824 /*
1825  * Return size of an attribute
1826  */
1827 
1828 int
1829 sa_size(sa_handle_t *hdl, sa_attr_type_t attr, int *size)
1830 {
1831         sa_bulk_attr_t bulk;
1832         int error;
1833 
1834         bulk.sa_data = NULL;
1835         bulk.sa_attr = attr;
1836         bulk.sa_data_func = NULL;
1837 
1838         ASSERT(hdl);
1839         mutex_enter(&hdl->sa_lock);
1840         if ((error = sa_attr_op(hdl, &bulk, 1, SA_LOOKUP, NULL)) != 0) {
1841                 mutex_exit(&hdl->sa_lock);
1842                 return (error);
1843         }
1844         *size = bulk.sa_size;
1845 
1846         mutex_exit(&hdl->sa_lock);
1847         return (0);
1848 }
1849 
1850 int
1851 sa_bulk_lookup_locked(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count)
1852 {
1853         ASSERT(hdl);
1854         ASSERT(MUTEX_HELD(&hdl->sa_lock));
1855         return (sa_lookup_impl(hdl, attrs, count));
1856 }
1857 
1858 int
1859 sa_bulk_lookup(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count)
1860 {
1861         int error;
1862 
1863         ASSERT(hdl);
1864         mutex_enter(&hdl->sa_lock);
1865         error = sa_bulk_lookup_locked(hdl, attrs, count);
1866         mutex_exit(&hdl->sa_lock);
1867         return (error);
1868 }
1869 
1870 int
1871 sa_bulk_update(sa_handle_t *hdl, sa_bulk_attr_t *attrs, int count, dmu_tx_t *tx)
1872 {
1873         int error;
1874 
1875         ASSERT(hdl);
1876         mutex_enter(&hdl->sa_lock);
1877         error = sa_bulk_update_impl(hdl, attrs, count, tx);
1878         mutex_exit(&hdl->sa_lock);
1879         return (error);
1880 }
1881 
1882 int
1883 sa_remove(sa_handle_t *hdl, sa_attr_type_t attr, dmu_tx_t *tx)
1884 {
1885         int error;
1886 
1887         mutex_enter(&hdl->sa_lock);
1888         error = sa_modify_attrs(hdl, attr, SA_REMOVE, NULL,
1889             NULL, 0, tx);
1890         mutex_exit(&hdl->sa_lock);
1891         return (error);
1892 }
1893 
1894 void
1895 sa_object_info(sa_handle_t *hdl, dmu_object_info_t *doi)
1896 {
1897         dmu_object_info_from_db((dmu_buf_t *)hdl->sa_bonus, doi);
1898 }
1899 
1900 void
1901 sa_object_size(sa_handle_t *hdl, uint32_t *blksize, u_longlong_t *nblocks)
1902 {
1903         dmu_object_size_from_db((dmu_buf_t *)hdl->sa_bonus,
1904             blksize, nblocks);
1905 }
1906 
1907 void
1908 sa_update_user(sa_handle_t *newhdl, sa_handle_t *oldhdl)
1909 {
1910         (void) dmu_buf_update_user((dmu_buf_t *)newhdl->sa_bonus,
1911             oldhdl, newhdl, NULL, sa_evict);
1912         oldhdl->sa_bonus = NULL;
1913 }
1914 
1915 void
1916 sa_set_userp(sa_handle_t *hdl, void *ptr)
1917 {
1918         hdl->sa_userp = ptr;
1919 }
1920 
1921 dmu_buf_t *
1922 sa_get_db(sa_handle_t *hdl)
1923 {
1924         return ((dmu_buf_t *)hdl->sa_bonus);
1925 }
1926 
1927 void *
1928 sa_get_userdata(sa_handle_t *hdl)
1929 {
1930         return (hdl->sa_userp);
1931 }
1932 
1933 void
1934 sa_register_update_callback_locked(objset_t *os, sa_update_cb_t *func)
1935 {
1936         ASSERT(MUTEX_HELD(&os->os_sa->sa_lock));
1937         os->os_sa->sa_update_cb = func;
1938 }
1939 
1940 void
1941 sa_register_update_callback(objset_t *os, sa_update_cb_t *func)
1942 {
1943 
1944         mutex_enter(&os->os_sa->sa_lock);
1945         sa_register_update_callback_locked(os, func);
1946         mutex_exit(&os->os_sa->sa_lock);
1947 }
1948 
1949 uint64_t
1950 sa_handle_object(sa_handle_t *hdl)
1951 {
1952         return (hdl->sa_bonus->db_object);
1953 }
1954 
1955 boolean_t
1956 sa_enabled(objset_t *os)
1957 {
1958         return (os->os_sa == NULL);
1959 }
1960 
1961 int
1962 sa_set_sa_object(objset_t *os, uint64_t sa_object)
1963 {
1964         sa_os_t *sa = os->os_sa;
1965 
1966         if (sa->sa_master_obj)
1967                 return (1);
1968 
1969         sa->sa_master_obj = sa_object;
1970 
1971         return (0);
1972 }
1973 
1974 int
1975 sa_hdrsize(void *arg)
1976 {
1977         sa_hdr_phys_t *hdr = arg;
1978 
1979         return (SA_HDR_SIZE(hdr));
1980 }
1981 
1982 void
1983 sa_handle_lock(sa_handle_t *hdl)
1984 {
1985         ASSERT(hdl);
1986         mutex_enter(&hdl->sa_lock);
1987 }
1988 
1989 void
1990 sa_handle_unlock(sa_handle_t *hdl)
1991 {
1992         ASSERT(hdl);
1993         mutex_exit(&hdl->sa_lock);
1994 }