fs/xfs/xfs_rmap_item.c

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_format.h"
   9 #include "xfs_log_format.h"
  10 #include "xfs_trans_resv.h"
  11 #include "xfs_bit.h"
  12 #include "xfs_shared.h"
  13 #include "xfs_mount.h"
  14 #include "xfs_defer.h"
  15 #include "xfs_trans.h"
  16 #include "xfs_trans_priv.h"
  17 #include "xfs_rmap_item.h"
  18 #include "xfs_log.h"
  19 #include "xfs_rmap.h"
  20 #include "xfs_error.h"
  21 #include "xfs_log_priv.h"
  22 #include "xfs_log_recover.h"
  23 #include "xfs_ag.h"
  24 #include "xfs_btree.h"
  25 #include "xfs_trace.h"
  26
  27 struct kmem_cache       *xfs_rui_cache;
  28 struct kmem_cache       *xfs_rud_cache;
  29
  30 static const struct xfs_item_ops xfs_rui_item_ops;
  31
  32 static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
  33 {
  34         return container_of(lip, struct xfs_rui_log_item, rui_item);
  35 }
  36
  37 STATIC void
  38 xfs_rui_item_free(
  39         struct xfs_rui_log_item *ruip)
  40 {
  41         kvfree(ruip->rui_item.li_lv_shadow);
  42         if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
  43                 kfree(ruip);
  44         else
  45                 kmem_cache_free(xfs_rui_cache, ruip);
  46 }
  47
  48 /*
  49  * Freeing the RUI requires that we remove it from the AIL if it has already
  50  * been placed there. However, the RUI may not yet have been placed in the AIL
  51  * when called by xfs_rui_release() from RUD processing due to the ordering of
  52  * committed vs unpin operations in bulk insert operations. Hence the reference
  53  * count to ensure only the last caller frees the RUI.
  54  */
  55 STATIC void
  56 xfs_rui_release(
  57         struct xfs_rui_log_item *ruip)
  58 {
  59         ASSERT(atomic_read(&ruip->rui_refcount) > 0);
  60         if (!atomic_dec_and_test(&ruip->rui_refcount))
  61                 return;
  62
  63         xfs_trans_ail_delete(&ruip->rui_item, 0);
  64         xfs_rui_item_free(ruip);
  65 }
  66
  67 STATIC void
  68 xfs_rui_item_size(
  69         struct xfs_log_item     *lip,
  70         int                     *nvecs,
  71         int                     *nbytes)
  72 {
  73         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
  74
  75         *nvecs += 1;
  76         *nbytes += xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents);
  77 }
  78
  79 /*
  80  * This is called to fill in the vector of log iovecs for the
  81  * given rui log item. We use only 1 iovec, and we point that
  82  * at the rui_log_format structure embedded in the rui item.
  83  * It is at this point that we assert that all of the extent
  84  * slots in the rui item have been filled.
  85  */
  86 STATIC void
  87 xfs_rui_item_format(
  88         struct xfs_log_item     *lip,
  89         struct xfs_log_vec      *lv)
  90 {
  91         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
  92         struct xfs_log_iovec    *vecp = NULL;
  93
  94         ASSERT(atomic_read(&ruip->rui_next_extent) ==
  95                         ruip->rui_format.rui_nextents);
  96
  97         ruip->rui_format.rui_type = XFS_LI_RUI;
  98         ruip->rui_format.rui_size = 1;
  99
 100         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
 101                         xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents));
 102 }
 103
 104 /*
 105  * The unpin operation is the last place an RUI is manipulated in the log. It is
 106  * either inserted in the AIL or aborted in the event of a log I/O error. In
 107  * either case, the RUI transaction has been successfully committed to make it
 108  * this far. Therefore, we expect whoever committed the RUI to either construct
 109  * and commit the RUD or drop the RUD's reference in the event of error. Simply
 110  * drop the log's RUI reference now that the log is done with it.
 111  */
 112 STATIC void
 113 xfs_rui_item_unpin(
 114         struct xfs_log_item     *lip,
 115         int                     remove)
 116 {
 117         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
 118
 119         xfs_rui_release(ruip);
 120 }
 121
 122 /*
 123  * The RUI has been either committed or aborted if the transaction has been
 124  * cancelled. If the transaction was cancelled, an RUD isn't going to be
 125  * constructed and thus we free the RUI here directly.
 126  */
 127 STATIC void
 128 xfs_rui_item_release(
 129         struct xfs_log_item     *lip)
 130 {
 131         xfs_rui_release(RUI_ITEM(lip));
 132 }
 133
 134 /*
 135  * Allocate and initialize an rui item with the given number of extents.
 136  */
 137 STATIC struct xfs_rui_log_item *
 138 xfs_rui_init(
 139         struct xfs_mount                *mp,
 140         uint                            nextents)
 141
 142 {
 143         struct xfs_rui_log_item         *ruip;
 144
 145         ASSERT(nextents > 0);
 146         if (nextents > XFS_RUI_MAX_FAST_EXTENTS)
 147                 ruip = kzalloc(xfs_rui_log_item_sizeof(nextents),
 148                                 GFP_KERNEL | __GFP_NOFAIL);
 149         else
 150                 ruip = kmem_cache_zalloc(xfs_rui_cache,
 151                                          GFP_KERNEL | __GFP_NOFAIL);
 152
 153         xfs_log_item_init(mp, &ruip->rui_item, XFS_LI_RUI, &xfs_rui_item_ops);
 154         ruip->rui_format.rui_nextents = nextents;
 155         ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
 156         atomic_set(&ruip->rui_next_extent, 0);
 157         atomic_set(&ruip->rui_refcount, 2);
 158
 159         return ruip;
 160 }
 161
 162 static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
 163 {
 164         return container_of(lip, struct xfs_rud_log_item, rud_item);
 165 }
 166
 167 STATIC void
 168 xfs_rud_item_size(
 169         struct xfs_log_item     *lip,
 170         int                     *nvecs,
 171         int                     *nbytes)
 172 {
 173         *nvecs += 1;
 174         *nbytes += sizeof(struct xfs_rud_log_format);
 175 }
 176
 177 /*
 178  * This is called to fill in the vector of log iovecs for the
 179  * given rud log item. We use only 1 iovec, and we point that
 180  * at the rud_log_format structure embedded in the rud item.
 181  * It is at this point that we assert that all of the extent
 182  * slots in the rud item have been filled.
 183  */
 184 STATIC void
 185 xfs_rud_item_format(
 186         struct xfs_log_item     *lip,
 187         struct xfs_log_vec      *lv)
 188 {
 189         struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
 190         struct xfs_log_iovec    *vecp = NULL;
 191
 192         rudp->rud_format.rud_type = XFS_LI_RUD;
 193         rudp->rud_format.rud_size = 1;
 194
 195         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
 196                         sizeof(struct xfs_rud_log_format));
 197 }
 198
 199 /*
 200  * The RUD is either committed or aborted if the transaction is cancelled. If
 201  * the transaction is cancelled, drop our reference to the RUI and free the
 202  * RUD.
 203  */
 204 STATIC void
 205 xfs_rud_item_release(
 206         struct xfs_log_item     *lip)
 207 {
 208         struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
 209
 210         xfs_rui_release(rudp->rud_ruip);
 211         kvfree(rudp->rud_item.li_lv_shadow);
 212         kmem_cache_free(xfs_rud_cache, rudp);
 213 }
 214
 215 static struct xfs_log_item *
 216 xfs_rud_item_intent(
 217         struct xfs_log_item     *lip)
 218 {
 219         return &RUD_ITEM(lip)->rud_ruip->rui_item;
 220 }
 221
 222 static const struct xfs_item_ops xfs_rud_item_ops = {
 223         .flags          = XFS_ITEM_RELEASE_WHEN_COMMITTED |
 224                           XFS_ITEM_INTENT_DONE,
 225         .iop_size       = xfs_rud_item_size,
 226         .iop_format     = xfs_rud_item_format,
 227         .iop_release    = xfs_rud_item_release,
 228         .iop_intent     = xfs_rud_item_intent,
 229 };
 230
 231 static inline struct xfs_rmap_intent *ri_entry(const struct list_head *e)
 232 {
 233         return list_entry(e, struct xfs_rmap_intent, ri_list);
 234 }
 235
 236 /* Sort rmap intents by AG. */
 237 static int
 238 xfs_rmap_update_diff_items(
 239         void                            *priv,
 240         const struct list_head          *a,
 241         const struct list_head          *b)
 242 {
 243         struct xfs_rmap_intent          *ra = ri_entry(a);
 244         struct xfs_rmap_intent          *rb = ri_entry(b);
 245
 246         return ra->ri_group->xg_gno - rb->ri_group->xg_gno;
 247 }
 248
 249 /* Log rmap updates in the intent item. */
 250 STATIC void
 251 xfs_rmap_update_log_item(
 252         struct xfs_trans                *tp,
 253         struct xfs_rui_log_item         *ruip,
 254         struct xfs_rmap_intent          *ri)
 255 {
 256         uint                            next_extent;
 257         struct xfs_map_extent           *map;
 258
 259         /*
 260          * atomic_inc_return gives us the value after the increment;
 261          * we want to use it as an array index so we need to subtract 1 from
 262          * it.
 263          */
 264         next_extent = atomic_inc_return(&ruip->rui_next_extent) - 1;
 265         ASSERT(next_extent < ruip->rui_format.rui_nextents);
 266         map = &ruip->rui_format.rui_extents[next_extent];
 267         map->me_owner = ri->ri_owner;
 268         map->me_startblock = ri->ri_bmap.br_startblock;
 269         map->me_startoff = ri->ri_bmap.br_startoff;
 270         map->me_len = ri->ri_bmap.br_blockcount;
 271
 272         map->me_flags = 0;
 273         if (ri->ri_bmap.br_state == XFS_EXT_UNWRITTEN)
 274                 map->me_flags |= XFS_RMAP_EXTENT_UNWRITTEN;
 275         if (ri->ri_whichfork == XFS_ATTR_FORK)
 276                 map->me_flags |= XFS_RMAP_EXTENT_ATTR_FORK;
 277         switch (ri->ri_type) {
 278         case XFS_RMAP_MAP:
 279                 map->me_flags |= XFS_RMAP_EXTENT_MAP;
 280                 break;
 281         case XFS_RMAP_MAP_SHARED:
 282                 map->me_flags |= XFS_RMAP_EXTENT_MAP_SHARED;
 283                 break;
 284         case XFS_RMAP_UNMAP:
 285                 map->me_flags |= XFS_RMAP_EXTENT_UNMAP;
 286                 break;
 287         case XFS_RMAP_UNMAP_SHARED:
 288                 map->me_flags |= XFS_RMAP_EXTENT_UNMAP_SHARED;
 289                 break;
 290         case XFS_RMAP_CONVERT:
 291                 map->me_flags |= XFS_RMAP_EXTENT_CONVERT;
 292                 break;
 293         case XFS_RMAP_CONVERT_SHARED:
 294                 map->me_flags |= XFS_RMAP_EXTENT_CONVERT_SHARED;
 295                 break;
 296         case XFS_RMAP_ALLOC:
 297                 map->me_flags |= XFS_RMAP_EXTENT_ALLOC;
 298                 break;
 299         case XFS_RMAP_FREE:
 300                 map->me_flags |= XFS_RMAP_EXTENT_FREE;
 301                 break;
 302         default:
 303                 ASSERT(0);
 304         }
 305 }
 306
 307 static struct xfs_log_item *
 308 xfs_rmap_update_create_intent(
 309         struct xfs_trans                *tp,
 310         struct list_head                *items,
 311         unsigned int                    count,
 312         bool                            sort)
 313 {
 314         struct xfs_mount                *mp = tp->t_mountp;
 315         struct xfs_rui_log_item         *ruip = xfs_rui_init(mp, count);
 316         struct xfs_rmap_intent          *ri;
 317
 318         ASSERT(count > 0);
 319
 320         if (sort)
 321                 list_sort(mp, items, xfs_rmap_update_diff_items);
 322         list_for_each_entry(ri, items, ri_list)
 323                 xfs_rmap_update_log_item(tp, ruip, ri);
 324         return &ruip->rui_item;
 325 }
 326
 327 /* Get an RUD so we can process all the deferred rmap updates. */
 328 static struct xfs_log_item *
 329 xfs_rmap_update_create_done(
 330         struct xfs_trans                *tp,
 331         struct xfs_log_item             *intent,
 332         unsigned int                    count)
 333 {
 334         struct xfs_rui_log_item         *ruip = RUI_ITEM(intent);
 335         struct xfs_rud_log_item         *rudp;
 336
 337         rudp = kmem_cache_zalloc(xfs_rud_cache, GFP_KERNEL | __GFP_NOFAIL);
 338         xfs_log_item_init(tp->t_mountp, &rudp->rud_item, XFS_LI_RUD,
 339                           &xfs_rud_item_ops);
 340         rudp->rud_ruip = ruip;
 341         rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;
 342
 343         return &rudp->rud_item;
 344 }
 345
 346 /* Add this deferred RUI to the transaction. */
 347 void
 348 xfs_rmap_defer_add(
 349         struct xfs_trans        *tp,
 350         struct xfs_rmap_intent  *ri)
 351 {
 352         struct xfs_mount        *mp = tp->t_mountp;
 353
 354         trace_xfs_rmap_defer(mp, ri);
 355
 356         ri->ri_group = xfs_group_intent_get(mp, ri->ri_bmap.br_startblock,
 357                         XG_TYPE_AG);
 358         xfs_defer_add(tp, &ri->ri_list, &xfs_rmap_update_defer_type);
 359 }
 360
 361 /* Cancel a deferred rmap update. */
 362 STATIC void
 363 xfs_rmap_update_cancel_item(
 364         struct list_head                *item)
 365 {
 366         struct xfs_rmap_intent          *ri = ri_entry(item);
 367
 368         xfs_group_intent_put(ri->ri_group);
 369         kmem_cache_free(xfs_rmap_intent_cache, ri);
 370 }
 371
 372 /* Process a deferred rmap update. */
 373 STATIC int
 374 xfs_rmap_update_finish_item(
 375         struct xfs_trans                *tp,
 376         struct xfs_log_item             *done,
 377         struct list_head                *item,
 378         struct xfs_btree_cur            **state)
 379 {
 380         struct xfs_rmap_intent          *ri = ri_entry(item);
 381         int                             error;
 382
 383         error = xfs_rmap_finish_one(tp, ri, state);
 384
 385         xfs_rmap_update_cancel_item(item);
 386         return error;
 387 }
 388
 389 /* Clean up after calling xfs_rmap_finish_one. */
 390 STATIC void
 391 xfs_rmap_finish_one_cleanup(
 392         struct xfs_trans        *tp,
 393         struct xfs_btree_cur    *rcur,
 394         int                     error)
 395 {
 396         struct xfs_buf          *agbp = NULL;
 397
 398         if (rcur == NULL)
 399                 return;
 400         agbp = rcur->bc_ag.agbp;
 401         xfs_btree_del_cursor(rcur, error);
 402         if (error && agbp)
 403                 xfs_trans_brelse(tp, agbp);
 404 }
 405
 406 /* Abort all pending RUIs. */
 407 STATIC void
 408 xfs_rmap_update_abort_intent(
 409         struct xfs_log_item     *intent)
 410 {
 411         xfs_rui_release(RUI_ITEM(intent));
 412 }
 413
 414 /* Is this recovered RUI ok? */
 415 static inline bool
 416 xfs_rui_validate_map(
 417         struct xfs_mount                *mp,
 418         struct xfs_map_extent           *map)
 419 {
 420         if (!xfs_has_rmapbt(mp))
 421                 return false;
 422
 423         if (map->me_flags & ~XFS_RMAP_EXTENT_FLAGS)
 424                 return false;
 425
 426         switch (map->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
 427         case XFS_RMAP_EXTENT_MAP:
 428         case XFS_RMAP_EXTENT_MAP_SHARED:
 429         case XFS_RMAP_EXTENT_UNMAP:
 430         case XFS_RMAP_EXTENT_UNMAP_SHARED:
 431         case XFS_RMAP_EXTENT_CONVERT:
 432         case XFS_RMAP_EXTENT_CONVERT_SHARED:
 433         case XFS_RMAP_EXTENT_ALLOC:
 434         case XFS_RMAP_EXTENT_FREE:
 435                 break;
 436         default:
 437                 return false;
 438         }
 439
 440         if (!XFS_RMAP_NON_INODE_OWNER(map->me_owner) &&
 441             !xfs_verify_ino(mp, map->me_owner))
 442                 return false;
 443
 444         if (!xfs_verify_fileext(mp, map->me_startoff, map->me_len))
 445                 return false;
 446
 447         return xfs_verify_fsbext(mp, map->me_startblock, map->me_len);
 448 }
 449
 450 static inline void
 451 xfs_rui_recover_work(
 452         struct xfs_mount                *mp,
 453         struct xfs_defer_pending        *dfp,
 454         const struct xfs_map_extent     *map)
 455 {
 456         struct xfs_rmap_intent          *ri;
 457
 458         ri = kmem_cache_alloc(xfs_rmap_intent_cache, GFP_KERNEL | __GFP_NOFAIL);
 459
 460         switch (map->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
 461         case XFS_RMAP_EXTENT_MAP:
 462                 ri->ri_type = XFS_RMAP_MAP;
 463                 break;
 464         case XFS_RMAP_EXTENT_MAP_SHARED:
 465                 ri->ri_type = XFS_RMAP_MAP_SHARED;
 466                 break;
 467         case XFS_RMAP_EXTENT_UNMAP:
 468                 ri->ri_type = XFS_RMAP_UNMAP;
 469                 break;
 470         case XFS_RMAP_EXTENT_UNMAP_SHARED:
 471                 ri->ri_type = XFS_RMAP_UNMAP_SHARED;
 472                 break;
 473         case XFS_RMAP_EXTENT_CONVERT:
 474                 ri->ri_type = XFS_RMAP_CONVERT;
 475                 break;
 476         case XFS_RMAP_EXTENT_CONVERT_SHARED:
 477                 ri->ri_type = XFS_RMAP_CONVERT_SHARED;
 478                 break;
 479         case XFS_RMAP_EXTENT_ALLOC:
 480                 ri->ri_type = XFS_RMAP_ALLOC;
 481                 break;
 482         case XFS_RMAP_EXTENT_FREE:
 483                 ri->ri_type = XFS_RMAP_FREE;
 484                 break;
 485         default:
 486                 ASSERT(0);
 487                 return;
 488         }
 489
 490         ri->ri_owner = map->me_owner;
 491         ri->ri_whichfork = (map->me_flags & XFS_RMAP_EXTENT_ATTR_FORK) ?
 492                         XFS_ATTR_FORK : XFS_DATA_FORK;
 493         ri->ri_bmap.br_startblock = map->me_startblock;
 494         ri->ri_bmap.br_startoff = map->me_startoff;
 495         ri->ri_bmap.br_blockcount = map->me_len;
 496         ri->ri_bmap.br_state = (map->me_flags & XFS_RMAP_EXTENT_UNWRITTEN) ?
 497                         XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
 498         ri->ri_group = xfs_group_intent_get(mp, map->me_startblock, XG_TYPE_AG);
 499
 500         xfs_defer_add_item(dfp, &ri->ri_list);
 501 }
 502
 503 /*
 504  * Process an rmap update intent item that was recovered from the log.
 505  * We need to update the rmapbt.
 506  */
 507 STATIC int
 508 xfs_rmap_recover_work(
 509         struct xfs_defer_pending        *dfp,
 510         struct list_head                *capture_list)
 511 {
 512         struct xfs_trans_res            resv;
 513         struct xfs_log_item             *lip = dfp->dfp_intent;
 514         struct xfs_rui_log_item         *ruip = RUI_ITEM(lip);
 515         struct xfs_trans                *tp;
 516         struct xfs_mount                *mp = lip->li_log->l_mp;
 517         int                             i;
 518         int                             error = 0;
 519
 520         /*
 521          * First check the validity of the extents described by the
 522          * RUI.  If any are bad, then assume that all are bad and
 523          * just toss the RUI.
 524          */
 525         for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
 526                 if (!xfs_rui_validate_map(mp,
 527                                         &ruip->rui_format.rui_extents[i])) {
 528                         XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 529                                         &ruip->rui_format,
 530                                         sizeof(ruip->rui_format));
 531                         return -EFSCORRUPTED;
 532                 }
 533
 534                 xfs_rui_recover_work(mp, dfp, &ruip->rui_format.rui_extents[i]);
 535         }
 536
 537         resv = xlog_recover_resv(&M_RES(mp)->tr_itruncate);
 538         error = xfs_trans_alloc(mp, &resv, mp->m_rmap_maxlevels, 0,
 539                         XFS_TRANS_RESERVE, &tp);
 540         if (error)
 541                 return error;
 542
 543         error = xlog_recover_finish_intent(tp, dfp);
 544         if (error == -EFSCORRUPTED)
 545                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 546                                 &ruip->rui_format,
 547                                 sizeof(ruip->rui_format));
 548         if (error)
 549                 goto abort_error;
 550
 551         return xfs_defer_ops_capture_and_commit(tp, capture_list);
 552
 553 abort_error:
 554         xfs_trans_cancel(tp);
 555         return error;
 556 }
 557
 558 /* Relog an intent item to push the log tail forward. */
 559 static struct xfs_log_item *
 560 xfs_rmap_relog_intent(
 561         struct xfs_trans                *tp,
 562         struct xfs_log_item             *intent,
 563         struct xfs_log_item             *done_item)
 564 {
 565         struct xfs_rui_log_item         *ruip;
 566         struct xfs_map_extent           *map;
 567         unsigned int                    count;
 568
 569         count = RUI_ITEM(intent)->rui_format.rui_nextents;
 570         map = RUI_ITEM(intent)->rui_format.rui_extents;
 571
 572         ruip = xfs_rui_init(tp->t_mountp, count);
 573         memcpy(ruip->rui_format.rui_extents, map, count * sizeof(*map));
 574         atomic_set(&ruip->rui_next_extent, count);
 575
 576         return &ruip->rui_item;
 577 }
 578
 579 const struct xfs_defer_op_type xfs_rmap_update_defer_type = {
 580         .name           = "rmap",
 581         .max_items      = XFS_RUI_MAX_FAST_EXTENTS,
 582         .create_intent  = xfs_rmap_update_create_intent,
 583         .abort_intent   = xfs_rmap_update_abort_intent,
 584         .create_done    = xfs_rmap_update_create_done,
 585         .finish_item    = xfs_rmap_update_finish_item,
 586         .finish_cleanup = xfs_rmap_finish_one_cleanup,
 587         .cancel_item    = xfs_rmap_update_cancel_item,
 588         .recover_work   = xfs_rmap_recover_work,
 589         .relog_intent   = xfs_rmap_relog_intent,
 590 };
 591
 592 STATIC bool
 593 xfs_rui_item_match(
 594         struct xfs_log_item     *lip,
 595         uint64_t                intent_id)
 596 {
 597         return RUI_ITEM(lip)->rui_format.rui_id == intent_id;
 598 }
 599
 600 static const struct xfs_item_ops xfs_rui_item_ops = {
 601         .flags          = XFS_ITEM_INTENT,
 602         .iop_size       = xfs_rui_item_size,
 603         .iop_format     = xfs_rui_item_format,
 604         .iop_unpin      = xfs_rui_item_unpin,
 605         .iop_release    = xfs_rui_item_release,
 606         .iop_match      = xfs_rui_item_match,
 607 };
 608
 609 static inline void
 610 xfs_rui_copy_format(
 611         struct xfs_rui_log_format       *dst,
 612         const struct xfs_rui_log_format *src)
 613 {
 614         unsigned int                    i;
 615
 616         memcpy(dst, src, offsetof(struct xfs_rui_log_format, rui_extents));
 617
 618         for (i = 0; i < src->rui_nextents; i++)
 619                 memcpy(&dst->rui_extents[i], &src->rui_extents[i],
 620                                 sizeof(struct xfs_map_extent));
 621 }
 622
 623 /*
 624  * This routine is called to create an in-core extent rmap update
 625  * item from the rui format structure which was logged on disk.
 626  * It allocates an in-core rui, copies the extents from the format
 627  * structure into it, and adds the rui to the AIL with the given
 628  * LSN.
 629  */
 630 STATIC int
 631 xlog_recover_rui_commit_pass2(
 632         struct xlog                     *log,
 633         struct list_head                *buffer_list,
 634         struct xlog_recover_item        *item,
 635         xfs_lsn_t                       lsn)
 636 {
 637         struct xfs_mount                *mp = log->l_mp;
 638         struct xfs_rui_log_item         *ruip;
 639         struct xfs_rui_log_format       *rui_formatp;
 640         size_t                          len;
 641
 642         rui_formatp = item->ri_buf[0].i_addr;
 643
 644         if (item->ri_buf[0].i_len < xfs_rui_log_format_sizeof(0)) {
 645                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 646                                 item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
 647                 return -EFSCORRUPTED;
 648         }
 649
 650         len = xfs_rui_log_format_sizeof(rui_formatp->rui_nextents);
 651         if (item->ri_buf[0].i_len != len) {
 652                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, mp,
 653                                 item->ri_buf[0].i_addr, item->ri_buf[0].i_len);
 654                 return -EFSCORRUPTED;
 655         }
 656
 657         ruip = xfs_rui_init(mp, rui_formatp->rui_nextents);
 658         xfs_rui_copy_format(&ruip->rui_format, rui_formatp);
 659         atomic_set(&ruip->rui_next_extent, rui_formatp->rui_nextents);
 660
 661         xlog_recover_intent_item(log, &ruip->rui_item, lsn,
 662                         &xfs_rmap_update_defer_type);
 663         return 0;
 664 }
 665
 666 const struct xlog_recover_item_ops xlog_rui_item_ops = {
 667         .item_type              = XFS_LI_RUI,
 668         .commit_pass2           = xlog_recover_rui_commit_pass2,
 669 };
 670
 671 /*
 672  * This routine is called when an RUD format structure is found in a committed
 673  * transaction in the log. Its purpose is to cancel the corresponding RUI if it
 674  * was still in the log. To do this it searches the AIL for the RUI with an id
 675  * equal to that in the RUD format structure. If we find it we drop the RUD
 676  * reference, which removes the RUI from the AIL and frees it.
 677  */
 678 STATIC int
 679 xlog_recover_rud_commit_pass2(
 680         struct xlog                     *log,
 681         struct list_head                *buffer_list,
 682         struct xlog_recover_item        *item,
 683         xfs_lsn_t                       lsn)
 684 {
 685         struct xfs_rud_log_format       *rud_formatp;
 686
 687         rud_formatp = item->ri_buf[0].i_addr;
 688         if (item->ri_buf[0].i_len != sizeof(struct xfs_rud_log_format)) {
 689                 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW, log->l_mp,
 690                                 rud_formatp, item->ri_buf[0].i_len);
 691                 return -EFSCORRUPTED;
 692         }
 693
 694         xlog_recover_release_intent(log, XFS_LI_RUI, rud_formatp->rud_rui_id);
 695         return 0;
 696 }
 697
 698 const struct xlog_recover_item_ops xlog_rud_item_ops = {
 699         .item_type              = XFS_LI_RUD,
 700         .commit_pass2           = xlog_recover_rud_commit_pass2,
 701 };