fs/xfs/xfs_bmap_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_inode.h"
  16 #include "xfs_trans.h"
  17 #include "xfs_trans_priv.h"
  18 #include "xfs_bmap_item.h"
  19 #include "xfs_log.h"
  20 #include "xfs_bmap.h"
  21 #include "xfs_icache.h"
  22 #include "xfs_bmap_btree.h"
  23 #include "xfs_trans_space.h"
  24 #include "xfs_error.h"
  25 #include "xfs_log_priv.h"
  26 #include "xfs_log_recover.h"
  27
  28 kmem_zone_t     *xfs_bui_zone;
  29 kmem_zone_t     *xfs_bud_zone;
  30
  31 static const struct xfs_item_ops xfs_bui_item_ops;
  32
  33 static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip)
  34 {
  35         return container_of(lip, struct xfs_bui_log_item, bui_item);
  36 }
  37
  38 STATIC void
  39 xfs_bui_item_free(
  40         struct xfs_bui_log_item *buip)
  41 {
  42         kmem_cache_free(xfs_bui_zone, buip);
  43 }
  44
  45 /*
  46  * Freeing the BUI requires that we remove it from the AIL if it has already
  47  * been placed there. However, the BUI may not yet have been placed in the AIL
  48  * when called by xfs_bui_release() from BUD processing due to the ordering of
  49  * committed vs unpin operations in bulk insert operations. Hence the reference
  50  * count to ensure only the last caller frees the BUI.
  51  */
  52 STATIC void
  53 xfs_bui_release(
  54         struct xfs_bui_log_item *buip)
  55 {
  56         ASSERT(atomic_read(&buip->bui_refcount) > 0);
  57         if (atomic_dec_and_test(&buip->bui_refcount)) {
  58                 xfs_trans_ail_delete(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR);
  59                 xfs_bui_item_free(buip);
  60         }
  61 }
  62
  63
  64 STATIC void
  65 xfs_bui_item_size(
  66         struct xfs_log_item     *lip,
  67         int                     *nvecs,
  68         int                     *nbytes)
  69 {
  70         struct xfs_bui_log_item *buip = BUI_ITEM(lip);
  71
  72         *nvecs += 1;
  73         *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents);
  74 }
  75
  76 /*
  77  * This is called to fill in the vector of log iovecs for the
  78  * given bui log item. We use only 1 iovec, and we point that
  79  * at the bui_log_format structure embedded in the bui item.
  80  * It is at this point that we assert that all of the extent
  81  * slots in the bui item have been filled.
  82  */
  83 STATIC void
  84 xfs_bui_item_format(
  85         struct xfs_log_item     *lip,
  86         struct xfs_log_vec      *lv)
  87 {
  88         struct xfs_bui_log_item *buip = BUI_ITEM(lip);
  89         struct xfs_log_iovec    *vecp = NULL;
  90
  91         ASSERT(atomic_read(&buip->bui_next_extent) ==
  92                         buip->bui_format.bui_nextents);
  93
  94         buip->bui_format.bui_type = XFS_LI_BUI;
  95         buip->bui_format.bui_size = 1;
  96
  97         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format,
  98                         xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents));
  99 }
 100
 101 /*
 102  * The unpin operation is the last place an BUI is manipulated in the log. It is
 103  * either inserted in the AIL or aborted in the event of a log I/O error. In
 104  * either case, the BUI transaction has been successfully committed to make it
 105  * this far. Therefore, we expect whoever committed the BUI to either construct
 106  * and commit the BUD or drop the BUD's reference in the event of error. Simply
 107  * drop the log's BUI reference now that the log is done with it.
 108  */
 109 STATIC void
 110 xfs_bui_item_unpin(
 111         struct xfs_log_item     *lip,
 112         int                     remove)
 113 {
 114         struct xfs_bui_log_item *buip = BUI_ITEM(lip);
 115
 116         xfs_bui_release(buip);
 117 }
 118
 119 /*
 120  * The BUI has been either committed or aborted if the transaction has been
 121  * cancelled. If the transaction was cancelled, an BUD isn't going to be
 122  * constructed and thus we free the BUI here directly.
 123  */
 124 STATIC void
 125 xfs_bui_item_release(
 126         struct xfs_log_item     *lip)
 127 {
 128         xfs_bui_release(BUI_ITEM(lip));
 129 }
 130
 131 /*
 132  * Allocate and initialize an bui item with the given number of extents.
 133  */
 134 STATIC struct xfs_bui_log_item *
 135 xfs_bui_init(
 136         struct xfs_mount                *mp)
 137
 138 {
 139         struct xfs_bui_log_item         *buip;
 140
 141         buip = kmem_zone_zalloc(xfs_bui_zone, 0);
 142
 143         xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops);
 144         buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS;
 145         buip->bui_format.bui_id = (uintptr_t)(void *)buip;
 146         atomic_set(&buip->bui_next_extent, 0);
 147         atomic_set(&buip->bui_refcount, 2);
 148
 149         return buip;
 150 }
 151
 152 static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip)
 153 {
 154         return container_of(lip, struct xfs_bud_log_item, bud_item);
 155 }
 156
 157 STATIC void
 158 xfs_bud_item_size(
 159         struct xfs_log_item     *lip,
 160         int                     *nvecs,
 161         int                     *nbytes)
 162 {
 163         *nvecs += 1;
 164         *nbytes += sizeof(struct xfs_bud_log_format);
 165 }
 166
 167 /*
 168  * This is called to fill in the vector of log iovecs for the
 169  * given bud log item. We use only 1 iovec, and we point that
 170  * at the bud_log_format structure embedded in the bud item.
 171  * It is at this point that we assert that all of the extent
 172  * slots in the bud item have been filled.
 173  */
 174 STATIC void
 175 xfs_bud_item_format(
 176         struct xfs_log_item     *lip,
 177         struct xfs_log_vec      *lv)
 178 {
 179         struct xfs_bud_log_item *budp = BUD_ITEM(lip);
 180         struct xfs_log_iovec    *vecp = NULL;
 181
 182         budp->bud_format.bud_type = XFS_LI_BUD;
 183         budp->bud_format.bud_size = 1;
 184
 185         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format,
 186                         sizeof(struct xfs_bud_log_format));
 187 }
 188
 189 /*
 190  * The BUD is either committed or aborted if the transaction is cancelled. If
 191  * the transaction is cancelled, drop our reference to the BUI and free the
 192  * BUD.
 193  */
 194 STATIC void
 195 xfs_bud_item_release(
 196         struct xfs_log_item     *lip)
 197 {
 198         struct xfs_bud_log_item *budp = BUD_ITEM(lip);
 199
 200         xfs_bui_release(budp->bud_buip);
 201         kmem_cache_free(xfs_bud_zone, budp);
 202 }
 203
 204 static const struct xfs_item_ops xfs_bud_item_ops = {
 205         .flags          = XFS_ITEM_RELEASE_WHEN_COMMITTED,
 206         .iop_size       = xfs_bud_item_size,
 207         .iop_format     = xfs_bud_item_format,
 208         .iop_release    = xfs_bud_item_release,
 209 };
 210
 211 static struct xfs_bud_log_item *
 212 xfs_trans_get_bud(
 213         struct xfs_trans                *tp,
 214         struct xfs_bui_log_item         *buip)
 215 {
 216         struct xfs_bud_log_item         *budp;
 217
 218         budp = kmem_zone_zalloc(xfs_bud_zone, 0);
 219         xfs_log_item_init(tp->t_mountp, &budp->bud_item, XFS_LI_BUD,
 220                           &xfs_bud_item_ops);
 221         budp->bud_buip = buip;
 222         budp->bud_format.bud_bui_id = buip->bui_format.bui_id;
 223
 224         xfs_trans_add_item(tp, &budp->bud_item);
 225         return budp;
 226 }
 227
 228 /*
 229  * Finish an bmap update and log it to the BUD. Note that the
 230  * transaction is marked dirty regardless of whether the bmap update
 231  * succeeds or fails to support the BUI/BUD lifecycle rules.
 232  */
 233 static int
 234 xfs_trans_log_finish_bmap_update(
 235         struct xfs_trans                *tp,
 236         struct xfs_bud_log_item         *budp,
 237         enum xfs_bmap_intent_type       type,
 238         struct xfs_inode                *ip,
 239         int                             whichfork,
 240         xfs_fileoff_t                   startoff,
 241         xfs_fsblock_t                   startblock,
 242         xfs_filblks_t                   *blockcount,
 243         xfs_exntst_t                    state)
 244 {
 245         int                             error;
 246
 247         error = xfs_bmap_finish_one(tp, ip, type, whichfork, startoff,
 248                         startblock, blockcount, state);
 249
 250         /*
 251          * Mark the transaction dirty, even on error. This ensures the
 252          * transaction is aborted, which:
 253          *
 254          * 1.) releases the BUI and frees the BUD
 255          * 2.) shuts down the filesystem
 256          */
 257         tp->t_flags |= XFS_TRANS_DIRTY;
 258         set_bit(XFS_LI_DIRTY, &budp->bud_item.li_flags);
 259
 260         return error;
 261 }
 262
 263 /* Sort bmap intents by inode. */
 264 static int
 265 xfs_bmap_update_diff_items(
 266         void                            *priv,
 267         struct list_head                *a,
 268         struct list_head                *b)
 269 {
 270         struct xfs_bmap_intent          *ba;
 271         struct xfs_bmap_intent          *bb;
 272
 273         ba = container_of(a, struct xfs_bmap_intent, bi_list);
 274         bb = container_of(b, struct xfs_bmap_intent, bi_list);
 275         return ba->bi_owner->i_ino - bb->bi_owner->i_ino;
 276 }
 277
 278 /* Set the map extent flags for this mapping. */
 279 static void
 280 xfs_trans_set_bmap_flags(
 281         struct xfs_map_extent           *bmap,
 282         enum xfs_bmap_intent_type       type,
 283         int                             whichfork,
 284         xfs_exntst_t                    state)
 285 {
 286         bmap->me_flags = 0;
 287         switch (type) {
 288         case XFS_BMAP_MAP:
 289         case XFS_BMAP_UNMAP:
 290                 bmap->me_flags = type;
 291                 break;
 292         default:
 293                 ASSERT(0);
 294         }
 295         if (state == XFS_EXT_UNWRITTEN)
 296                 bmap->me_flags |= XFS_BMAP_EXTENT_UNWRITTEN;
 297         if (whichfork == XFS_ATTR_FORK)
 298                 bmap->me_flags |= XFS_BMAP_EXTENT_ATTR_FORK;
 299 }
 300
 301 /* Log bmap updates in the intent item. */
 302 STATIC void
 303 xfs_bmap_update_log_item(
 304         struct xfs_trans                *tp,
 305         struct xfs_bui_log_item         *buip,
 306         struct xfs_bmap_intent          *bmap)
 307 {
 308         uint                            next_extent;
 309         struct xfs_map_extent           *map;
 310
 311         tp->t_flags |= XFS_TRANS_DIRTY;
 312         set_bit(XFS_LI_DIRTY, &buip->bui_item.li_flags);
 313
 314         /*
 315          * atomic_inc_return gives us the value after the increment;
 316          * we want to use it as an array index so we need to subtract 1 from
 317          * it.
 318          */
 319         next_extent = atomic_inc_return(&buip->bui_next_extent) - 1;
 320         ASSERT(next_extent < buip->bui_format.bui_nextents);
 321         map = &buip->bui_format.bui_extents[next_extent];
 322         map->me_owner = bmap->bi_owner->i_ino;
 323         map->me_startblock = bmap->bi_bmap.br_startblock;
 324         map->me_startoff = bmap->bi_bmap.br_startoff;
 325         map->me_len = bmap->bi_bmap.br_blockcount;
 326         xfs_trans_set_bmap_flags(map, bmap->bi_type, bmap->bi_whichfork,
 327                         bmap->bi_bmap.br_state);
 328 }
 329
 330 static struct xfs_log_item *
 331 xfs_bmap_update_create_intent(
 332         struct xfs_trans                *tp,
 333         struct list_head                *items,
 334         unsigned int                    count,
 335         bool                            sort)
 336 {
 337         struct xfs_mount                *mp = tp->t_mountp;
 338         struct xfs_bui_log_item         *buip = xfs_bui_init(mp);
 339         struct xfs_bmap_intent          *bmap;
 340
 341         ASSERT(count == XFS_BUI_MAX_FAST_EXTENTS);
 342
 343         xfs_trans_add_item(tp, &buip->bui_item);
 344         if (sort)
 345                 list_sort(mp, items, xfs_bmap_update_diff_items);
 346         list_for_each_entry(bmap, items, bi_list)
 347                 xfs_bmap_update_log_item(tp, buip, bmap);
 348         return &buip->bui_item;
 349 }
 350
 351 /* Get an BUD so we can process all the deferred rmap updates. */
 352 static struct xfs_log_item *
 353 xfs_bmap_update_create_done(
 354         struct xfs_trans                *tp,
 355         struct xfs_log_item             *intent,
 356         unsigned int                    count)
 357 {
 358         return &xfs_trans_get_bud(tp, BUI_ITEM(intent))->bud_item;
 359 }
 360
 361 /* Process a deferred rmap update. */
 362 STATIC int
 363 xfs_bmap_update_finish_item(
 364         struct xfs_trans                *tp,
 365         struct xfs_log_item             *done,
 366         struct list_head                *item,
 367         struct xfs_btree_cur            **state)
 368 {
 369         struct xfs_bmap_intent          *bmap;
 370         xfs_filblks_t                   count;
 371         int                             error;
 372
 373         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
 374         count = bmap->bi_bmap.br_blockcount;
 375         error = xfs_trans_log_finish_bmap_update(tp, BUD_ITEM(done),
 376                         bmap->bi_type,
 377                         bmap->bi_owner, bmap->bi_whichfork,
 378                         bmap->bi_bmap.br_startoff,
 379                         bmap->bi_bmap.br_startblock,
 380                         &count,
 381                         bmap->bi_bmap.br_state);
 382         if (!error && count > 0) {
 383                 ASSERT(bmap->bi_type == XFS_BMAP_UNMAP);
 384                 bmap->bi_bmap.br_blockcount = count;
 385                 return -EAGAIN;
 386         }
 387         kmem_free(bmap);
 388         return error;
 389 }
 390
 391 /* Abort all pending BUIs. */
 392 STATIC void
 393 xfs_bmap_update_abort_intent(
 394         struct xfs_log_item             *intent)
 395 {
 396         xfs_bui_release(BUI_ITEM(intent));
 397 }
 398
 399 /* Cancel a deferred rmap update. */
 400 STATIC void
 401 xfs_bmap_update_cancel_item(
 402         struct list_head                *item)
 403 {
 404         struct xfs_bmap_intent          *bmap;
 405
 406         bmap = container_of(item, struct xfs_bmap_intent, bi_list);
 407         kmem_free(bmap);
 408 }
 409
 410 const struct xfs_defer_op_type xfs_bmap_update_defer_type = {
 411         .max_items      = XFS_BUI_MAX_FAST_EXTENTS,
 412         .create_intent  = xfs_bmap_update_create_intent,
 413         .abort_intent   = xfs_bmap_update_abort_intent,
 414         .create_done    = xfs_bmap_update_create_done,
 415         .finish_item    = xfs_bmap_update_finish_item,
 416         .cancel_item    = xfs_bmap_update_cancel_item,
 417 };
 418
 419 /*
 420  * Process a bmap update intent item that was recovered from the log.
 421  * We need to update some inode's bmbt.
 422  */
 423 STATIC int
 424 xfs_bui_item_recover(
 425         struct xfs_log_item             *lip,
 426         struct xfs_trans                *parent_tp)
 427 {
 428         struct xfs_bmbt_irec            irec;
 429         struct xfs_bui_log_item         *buip = BUI_ITEM(lip);
 430         struct xfs_trans                *tp;
 431         struct xfs_inode                *ip = NULL;
 432         struct xfs_mount                *mp = parent_tp->t_mountp;
 433         struct xfs_map_extent           *bmap;
 434         struct xfs_bud_log_item         *budp;
 435         xfs_fsblock_t                   startblock_fsb;
 436         xfs_fsblock_t                   inode_fsb;
 437         xfs_filblks_t                   count;
 438         xfs_exntst_t                    state;
 439         enum xfs_bmap_intent_type       type;
 440         bool                            op_ok;
 441         unsigned int                    bui_type;
 442         int                             whichfork;
 443         int                             error = 0;
 444
 445         /* Only one mapping operation per BUI... */
 446         if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
 447                 xfs_bui_release(buip);
 448                 return -EFSCORRUPTED;
 449         }
 450
 451         /*
 452          * First check the validity of the extent described by the
 453          * BUI.  If anything is bad, then toss the BUI.
 454          */
 455         bmap = &buip->bui_format.bui_extents[0];
 456         startblock_fsb = XFS_BB_TO_FSB(mp,
 457                            XFS_FSB_TO_DADDR(mp, bmap->me_startblock));
 458         inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp,
 459                         XFS_INO_TO_FSB(mp, bmap->me_owner)));
 460         switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) {
 461         case XFS_BMAP_MAP:
 462         case XFS_BMAP_UNMAP:
 463                 op_ok = true;
 464                 break;
 465         default:
 466                 op_ok = false;
 467                 break;
 468         }
 469         if (!op_ok || startblock_fsb == 0 ||
 470             bmap->me_len == 0 ||
 471             inode_fsb == 0 ||
 472             startblock_fsb >= mp->m_sb.sb_dblocks ||
 473             bmap->me_len >= mp->m_sb.sb_agblocks ||
 474             inode_fsb >= mp->m_sb.sb_dblocks ||
 475             (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) {
 476                 /*
 477                  * This will pull the BUI from the AIL and
 478                  * free the memory associated with it.
 479                  */
 480                 xfs_bui_release(buip);
 481                 return -EFSCORRUPTED;
 482         }
 483
 484         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate,
 485                         XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp);
 486         if (error)
 487                 return error;
 488         /*
 489          * Recovery stashes all deferred ops during intent processing and
 490          * finishes them on completion. Transfer current dfops state to this
 491          * transaction and transfer the result back before we return.
 492          */
 493         xfs_defer_move(tp, parent_tp);
 494         budp = xfs_trans_get_bud(tp, buip);
 495
 496         /* Grab the inode. */
 497         error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip);
 498         if (error)
 499                 goto err_inode;
 500
 501         if (VFS_I(ip)->i_nlink == 0)
 502                 xfs_iflags_set(ip, XFS_IRECOVERY);
 503
 504         /* Process deferred bmap item. */
 505         state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ?
 506                         XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
 507         whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ?
 508                         XFS_ATTR_FORK : XFS_DATA_FORK;
 509         bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK;
 510         switch (bui_type) {
 511         case XFS_BMAP_MAP:
 512         case XFS_BMAP_UNMAP:
 513                 type = bui_type;
 514                 break;
 515         default:
 516                 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, mp);
 517                 error = -EFSCORRUPTED;
 518                 goto err_inode;
 519         }
 520         xfs_trans_ijoin(tp, ip, 0);
 521
 522         count = bmap->me_len;
 523         error = xfs_trans_log_finish_bmap_update(tp, budp, type, ip, whichfork,
 524                         bmap->me_startoff, bmap->me_startblock, &count, state);
 525         if (error)
 526                 goto err_inode;
 527
 528         if (count > 0) {
 529                 ASSERT(type == XFS_BMAP_UNMAP);
 530                 irec.br_startblock = bmap->me_startblock;
 531                 irec.br_blockcount = count;
 532                 irec.br_startoff = bmap->me_startoff;
 533                 irec.br_state = state;
 534                 xfs_bmap_unmap_extent(tp, ip, &irec);
 535         }
 536
 537         xfs_defer_move(parent_tp, tp);
 538         error = xfs_trans_commit(tp);
 539         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 540         xfs_irele(ip);
 541
 542         return error;
 543
 544 err_inode:
 545         xfs_defer_move(parent_tp, tp);
 546         xfs_trans_cancel(tp);
 547         if (ip) {
 548                 xfs_iunlock(ip, XFS_ILOCK_EXCL);
 549                 xfs_irele(ip);
 550         }
 551         return error;
 552 }
 553
 554 STATIC bool
 555 xfs_bui_item_match(
 556         struct xfs_log_item     *lip,
 557         uint64_t                intent_id)
 558 {
 559         return BUI_ITEM(lip)->bui_format.bui_id == intent_id;
 560 }
 561
 562 static const struct xfs_item_ops xfs_bui_item_ops = {
 563         .iop_size       = xfs_bui_item_size,
 564         .iop_format     = xfs_bui_item_format,
 565         .iop_unpin      = xfs_bui_item_unpin,
 566         .iop_release    = xfs_bui_item_release,
 567         .iop_recover    = xfs_bui_item_recover,
 568         .iop_match      = xfs_bui_item_match,
 569 };
 570
 571 /*
 572  * Copy an BUI format buffer from the given buf, and into the destination
 573  * BUI format structure.  The BUI/BUD items were designed not to need any
 574  * special alignment handling.
 575  */
 576 static int
 577 xfs_bui_copy_format(
 578         struct xfs_log_iovec            *buf,
 579         struct xfs_bui_log_format       *dst_bui_fmt)
 580 {
 581         struct xfs_bui_log_format       *src_bui_fmt;
 582         uint                            len;
 583
 584         src_bui_fmt = buf->i_addr;
 585         len = xfs_bui_log_format_sizeof(src_bui_fmt->bui_nextents);
 586
 587         if (buf->i_len == len) {
 588                 memcpy(dst_bui_fmt, src_bui_fmt, len);
 589                 return 0;
 590         }
 591         XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, NULL);
 592         return -EFSCORRUPTED;
 593 }
 594
 595 /*
 596  * This routine is called to create an in-core extent bmap update
 597  * item from the bui format structure which was logged on disk.
 598  * It allocates an in-core bui, copies the extents from the format
 599  * structure into it, and adds the bui to the AIL with the given
 600  * LSN.
 601  */
 602 STATIC int
 603 xlog_recover_bui_commit_pass2(
 604         struct xlog                     *log,
 605         struct list_head                *buffer_list,
 606         struct xlog_recover_item        *item,
 607         xfs_lsn_t                       lsn)
 608 {
 609         int                             error;
 610         struct xfs_mount                *mp = log->l_mp;
 611         struct xfs_bui_log_item         *buip;
 612         struct xfs_bui_log_format       *bui_formatp;
 613
 614         bui_formatp = item->ri_buf[0].i_addr;
 615
 616         if (bui_formatp->bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) {
 617                 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
 618                 return -EFSCORRUPTED;
 619         }
 620         buip = xfs_bui_init(mp);
 621         error = xfs_bui_copy_format(&item->ri_buf[0], &buip->bui_format);
 622         if (error) {
 623                 xfs_bui_item_free(buip);
 624                 return error;
 625         }
 626         atomic_set(&buip->bui_next_extent, bui_formatp->bui_nextents);
 627         /*
 628          * Insert the intent into the AIL directly and drop one reference so
 629          * that finishing or canceling the work will drop the other.
 630          */
 631         xfs_trans_ail_insert(log->l_ailp, &buip->bui_item, lsn);
 632         xfs_bui_release(buip);
 633         return 0;
 634 }
 635
 636 const struct xlog_recover_item_ops xlog_bui_item_ops = {
 637         .item_type              = XFS_LI_BUI,
 638         .commit_pass2           = xlog_recover_bui_commit_pass2,
 639 };
 640
 641 /*
 642  * This routine is called when an BUD format structure is found in a committed
 643  * transaction in the log. Its purpose is to cancel the corresponding BUI if it
 644  * was still in the log. To do this it searches the AIL for the BUI with an id
 645  * equal to that in the BUD format structure. If we find it we drop the BUD
 646  * reference, which removes the BUI from the AIL and frees it.
 647  */
 648 STATIC int
 649 xlog_recover_bud_commit_pass2(
 650         struct xlog                     *log,
 651         struct list_head                *buffer_list,
 652         struct xlog_recover_item        *item,
 653         xfs_lsn_t                       lsn)
 654 {
 655         struct xfs_bud_log_format       *bud_formatp;
 656
 657         bud_formatp = item->ri_buf[0].i_addr;
 658         if (item->ri_buf[0].i_len != sizeof(struct xfs_bud_log_format)) {
 659                 XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW, log->l_mp);
 660                 return -EFSCORRUPTED;
 661         }
 662
 663         xlog_recover_release_intent(log, XFS_LI_BUI, bud_formatp->bud_bui_id);
 664         return 0;
 665 }
 666
 667 const struct xlog_recover_item_ops xlog_bud_item_ops = {
 668         .item_type              = XFS_LI_BUD,
 669         .commit_pass2           = xlog_recover_bud_commit_pass2,
 670 };