fs/xfs/xfs_rmap_item.c

   1 /*
   2  * Copyright (C) 2016 Oracle.  All Rights Reserved.
   3  *
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write the Free Software Foundation,
  18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20 #include "xfs.h"
  21 #include "xfs_fs.h"
  22 #include "xfs_format.h"
  23 #include "xfs_log_format.h"
  24 #include "xfs_trans_resv.h"
  25 #include "xfs_bit.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_defer.h"
  28 #include "xfs_trans.h"
  29 #include "xfs_trans_priv.h"
  30 #include "xfs_buf_item.h"
  31 #include "xfs_rmap_item.h"
  32 #include "xfs_log.h"
  33 #include "xfs_rmap.h"
  34
  35
  36 kmem_zone_t     *xfs_rui_zone;
  37 kmem_zone_t     *xfs_rud_zone;
  38
  39 static inline struct xfs_rui_log_item *RUI_ITEM(struct xfs_log_item *lip)
  40 {
  41         return container_of(lip, struct xfs_rui_log_item, rui_item);
  42 }
  43
  44 void
  45 xfs_rui_item_free(
  46         struct xfs_rui_log_item *ruip)
  47 {
  48         if (ruip->rui_format.rui_nextents > XFS_RUI_MAX_FAST_EXTENTS)
  49                 kmem_free(ruip);
  50         else
  51                 kmem_zone_free(xfs_rui_zone, ruip);
  52 }
  53
  54 STATIC void
  55 xfs_rui_item_size(
  56         struct xfs_log_item     *lip,
  57         int                     *nvecs,
  58         int                     *nbytes)
  59 {
  60         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
  61
  62         *nvecs += 1;
  63         *nbytes += xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents);
  64 }
  65
  66 /*
  67  * This is called to fill in the vector of log iovecs for the
  68  * given rui log item. We use only 1 iovec, and we point that
  69  * at the rui_log_format structure embedded in the rui item.
  70  * It is at this point that we assert that all of the extent
  71  * slots in the rui item have been filled.
  72  */
  73 STATIC void
  74 xfs_rui_item_format(
  75         struct xfs_log_item     *lip,
  76         struct xfs_log_vec      *lv)
  77 {
  78         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
  79         struct xfs_log_iovec    *vecp = NULL;
  80
  81         ASSERT(atomic_read(&ruip->rui_next_extent) ==
  82                         ruip->rui_format.rui_nextents);
  83
  84         ruip->rui_format.rui_type = XFS_LI_RUI;
  85         ruip->rui_format.rui_size = 1;
  86
  87         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUI_FORMAT, &ruip->rui_format,
  88                         xfs_rui_log_format_sizeof(ruip->rui_format.rui_nextents));
  89 }
  90
  91 /*
  92  * Pinning has no meaning for an rui item, so just return.
  93  */
  94 STATIC void
  95 xfs_rui_item_pin(
  96         struct xfs_log_item     *lip)
  97 {
  98 }
  99
 100 /*
 101  * The unpin operation is the last place an RUI is manipulated in the log. It is
 102  * either inserted in the AIL or aborted in the event of a log I/O error. In
 103  * either case, the RUI transaction has been successfully committed to make it
 104  * this far. Therefore, we expect whoever committed the RUI to either construct
 105  * and commit the RUD or drop the RUD's reference in the event of error. Simply
 106  * drop the log's RUI reference now that the log is done with it.
 107  */
 108 STATIC void
 109 xfs_rui_item_unpin(
 110         struct xfs_log_item     *lip,
 111         int                     remove)
 112 {
 113         struct xfs_rui_log_item *ruip = RUI_ITEM(lip);
 114
 115         xfs_rui_release(ruip);
 116 }
 117
 118 /*
 119  * RUI items have no locking or pushing.  However, since RUIs are pulled from
 120  * the AIL when their corresponding RUDs are committed to disk, their situation
 121  * is very similar to being pinned.  Return XFS_ITEM_PINNED so that the caller
 122  * will eventually flush the log.  This should help in getting the RUI out of
 123  * the AIL.
 124  */
 125 STATIC uint
 126 xfs_rui_item_push(
 127         struct xfs_log_item     *lip,
 128         struct list_head        *buffer_list)
 129 {
 130         return XFS_ITEM_PINNED;
 131 }
 132
 133 /*
 134  * The RUI has been either committed or aborted if the transaction has been
 135  * cancelled. If the transaction was cancelled, an RUD isn't going to be
 136  * constructed and thus we free the RUI here directly.
 137  */
 138 STATIC void
 139 xfs_rui_item_unlock(
 140         struct xfs_log_item     *lip)
 141 {
 142         if (lip->li_flags & XFS_LI_ABORTED)
 143                 xfs_rui_item_free(RUI_ITEM(lip));
 144 }
 145
 146 /*
 147  * The RUI is logged only once and cannot be moved in the log, so simply return
 148  * the lsn at which it's been logged.
 149  */
 150 STATIC xfs_lsn_t
 151 xfs_rui_item_committed(
 152         struct xfs_log_item     *lip,
 153         xfs_lsn_t               lsn)
 154 {
 155         return lsn;
 156 }
 157
 158 /*
 159  * The RUI dependency tracking op doesn't do squat.  It can't because
 160  * it doesn't know where the free extent is coming from.  The dependency
 161  * tracking has to be handled by the "enclosing" metadata object.  For
 162  * example, for inodes, the inode is locked throughout the extent freeing
 163  * so the dependency should be recorded there.
 164  */
 165 STATIC void
 166 xfs_rui_item_committing(
 167         struct xfs_log_item     *lip,
 168         xfs_lsn_t               lsn)
 169 {
 170 }
 171
 172 /*
 173  * This is the ops vector shared by all rui log items.
 174  */
 175 static const struct xfs_item_ops xfs_rui_item_ops = {
 176         .iop_size       = xfs_rui_item_size,
 177         .iop_format     = xfs_rui_item_format,
 178         .iop_pin        = xfs_rui_item_pin,
 179         .iop_unpin      = xfs_rui_item_unpin,
 180         .iop_unlock     = xfs_rui_item_unlock,
 181         .iop_committed  = xfs_rui_item_committed,
 182         .iop_push       = xfs_rui_item_push,
 183         .iop_committing = xfs_rui_item_committing,
 184 };
 185
 186 /*
 187  * Allocate and initialize an rui item with the given number of extents.
 188  */
 189 struct xfs_rui_log_item *
 190 xfs_rui_init(
 191         struct xfs_mount                *mp,
 192         uint                            nextents)
 193
 194 {
 195         struct xfs_rui_log_item         *ruip;
 196
 197         ASSERT(nextents > 0);
 198         if (nextents > XFS_RUI_MAX_FAST_EXTENTS)
 199                 ruip = kmem_zalloc(xfs_rui_log_item_sizeof(nextents), KM_SLEEP);
 200         else
 201                 ruip = kmem_zone_zalloc(xfs_rui_zone, KM_SLEEP);
 202
 203         xfs_log_item_init(mp, &ruip->rui_item, XFS_LI_RUI, &xfs_rui_item_ops);
 204         ruip->rui_format.rui_nextents = nextents;
 205         ruip->rui_format.rui_id = (uintptr_t)(void *)ruip;
 206         atomic_set(&ruip->rui_next_extent, 0);
 207         atomic_set(&ruip->rui_refcount, 2);
 208
 209         return ruip;
 210 }
 211
 212 /*
 213  * Copy an RUI format buffer from the given buf, and into the destination
 214  * RUI format structure.  The RUI/RUD items were designed not to need any
 215  * special alignment handling.
 216  */
 217 int
 218 xfs_rui_copy_format(
 219         struct xfs_log_iovec            *buf,
 220         struct xfs_rui_log_format       *dst_rui_fmt)
 221 {
 222         struct xfs_rui_log_format       *src_rui_fmt;
 223         uint                            len;
 224
 225         src_rui_fmt = buf->i_addr;
 226         len = xfs_rui_log_format_sizeof(src_rui_fmt->rui_nextents);
 227
 228         if (buf->i_len != len)
 229                 return -EFSCORRUPTED;
 230
 231         memcpy(dst_rui_fmt, src_rui_fmt, len);
 232         return 0;
 233 }
 234
 235 /*
 236  * Freeing the RUI requires that we remove it from the AIL if it has already
 237  * been placed there. However, the RUI may not yet have been placed in the AIL
 238  * when called by xfs_rui_release() from RUD processing due to the ordering of
 239  * committed vs unpin operations in bulk insert operations. Hence the reference
 240  * count to ensure only the last caller frees the RUI.
 241  */
 242 void
 243 xfs_rui_release(
 244         struct xfs_rui_log_item *ruip)
 245 {
 246         ASSERT(atomic_read(&ruip->rui_refcount) > 0);
 247         if (atomic_dec_and_test(&ruip->rui_refcount)) {
 248                 xfs_trans_ail_remove(&ruip->rui_item, SHUTDOWN_LOG_IO_ERROR);
 249                 xfs_rui_item_free(ruip);
 250         }
 251 }
 252
 253 static inline struct xfs_rud_log_item *RUD_ITEM(struct xfs_log_item *lip)
 254 {
 255         return container_of(lip, struct xfs_rud_log_item, rud_item);
 256 }
 257
 258 STATIC void
 259 xfs_rud_item_size(
 260         struct xfs_log_item     *lip,
 261         int                     *nvecs,
 262         int                     *nbytes)
 263 {
 264         *nvecs += 1;
 265         *nbytes += sizeof(struct xfs_rud_log_format);
 266 }
 267
 268 /*
 269  * This is called to fill in the vector of log iovecs for the
 270  * given rud log item. We use only 1 iovec, and we point that
 271  * at the rud_log_format structure embedded in the rud item.
 272  * It is at this point that we assert that all of the extent
 273  * slots in the rud item have been filled.
 274  */
 275 STATIC void
 276 xfs_rud_item_format(
 277         struct xfs_log_item     *lip,
 278         struct xfs_log_vec      *lv)
 279 {
 280         struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
 281         struct xfs_log_iovec    *vecp = NULL;
 282
 283         rudp->rud_format.rud_type = XFS_LI_RUD;
 284         rudp->rud_format.rud_size = 1;
 285
 286         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_RUD_FORMAT, &rudp->rud_format,
 287                         sizeof(struct xfs_rud_log_format));
 288 }
 289
 290 /*
 291  * Pinning has no meaning for an rud item, so just return.
 292  */
 293 STATIC void
 294 xfs_rud_item_pin(
 295         struct xfs_log_item     *lip)
 296 {
 297 }
 298
 299 /*
 300  * Since pinning has no meaning for an rud item, unpinning does
 301  * not either.
 302  */
 303 STATIC void
 304 xfs_rud_item_unpin(
 305         struct xfs_log_item     *lip,
 306         int                     remove)
 307 {
 308 }
 309
 310 /*
 311  * There isn't much you can do to push on an rud item.  It is simply stuck
 312  * waiting for the log to be flushed to disk.
 313  */
 314 STATIC uint
 315 xfs_rud_item_push(
 316         struct xfs_log_item     *lip,
 317         struct list_head        *buffer_list)
 318 {
 319         return XFS_ITEM_PINNED;
 320 }
 321
 322 /*
 323  * The RUD is either committed or aborted if the transaction is cancelled. If
 324  * the transaction is cancelled, drop our reference to the RUI and free the
 325  * RUD.
 326  */
 327 STATIC void
 328 xfs_rud_item_unlock(
 329         struct xfs_log_item     *lip)
 330 {
 331         struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
 332
 333         if (lip->li_flags & XFS_LI_ABORTED) {
 334                 xfs_rui_release(rudp->rud_ruip);
 335                 kmem_zone_free(xfs_rud_zone, rudp);
 336         }
 337 }
 338
 339 /*
 340  * When the rud item is committed to disk, all we need to do is delete our
 341  * reference to our partner rui item and then free ourselves. Since we're
 342  * freeing ourselves we must return -1 to keep the transaction code from
 343  * further referencing this item.
 344  */
 345 STATIC xfs_lsn_t
 346 xfs_rud_item_committed(
 347         struct xfs_log_item     *lip,
 348         xfs_lsn_t               lsn)
 349 {
 350         struct xfs_rud_log_item *rudp = RUD_ITEM(lip);
 351
 352         /*
 353          * Drop the RUI reference regardless of whether the RUD has been
 354          * aborted. Once the RUD transaction is constructed, it is the sole
 355          * responsibility of the RUD to release the RUI (even if the RUI is
 356          * aborted due to log I/O error).
 357          */
 358         xfs_rui_release(rudp->rud_ruip);
 359         kmem_zone_free(xfs_rud_zone, rudp);
 360
 361         return (xfs_lsn_t)-1;
 362 }
 363
 364 /*
 365  * The RUD dependency tracking op doesn't do squat.  It can't because
 366  * it doesn't know where the free extent is coming from.  The dependency
 367  * tracking has to be handled by the "enclosing" metadata object.  For
 368  * example, for inodes, the inode is locked throughout the extent freeing
 369  * so the dependency should be recorded there.
 370  */
 371 STATIC void
 372 xfs_rud_item_committing(
 373         struct xfs_log_item     *lip,
 374         xfs_lsn_t               lsn)
 375 {
 376 }
 377
 378 /*
 379  * This is the ops vector shared by all rud log items.
 380  */
 381 static const struct xfs_item_ops xfs_rud_item_ops = {
 382         .iop_size       = xfs_rud_item_size,
 383         .iop_format     = xfs_rud_item_format,
 384         .iop_pin        = xfs_rud_item_pin,
 385         .iop_unpin      = xfs_rud_item_unpin,
 386         .iop_unlock     = xfs_rud_item_unlock,
 387         .iop_committed  = xfs_rud_item_committed,
 388         .iop_push       = xfs_rud_item_push,
 389         .iop_committing = xfs_rud_item_committing,
 390 };
 391
 392 /*
 393  * Allocate and initialize an rud item with the given number of extents.
 394  */
 395 struct xfs_rud_log_item *
 396 xfs_rud_init(
 397         struct xfs_mount                *mp,
 398         struct xfs_rui_log_item         *ruip)
 399
 400 {
 401         struct xfs_rud_log_item *rudp;
 402
 403         rudp = kmem_zone_zalloc(xfs_rud_zone, KM_SLEEP);
 404         xfs_log_item_init(mp, &rudp->rud_item, XFS_LI_RUD, &xfs_rud_item_ops);
 405         rudp->rud_ruip = ruip;
 406         rudp->rud_format.rud_rui_id = ruip->rui_format.rui_id;
 407
 408         return rudp;
 409 }
 410
 411 /*
 412  * Process an rmap update intent item that was recovered from the log.
 413  * We need to update the rmapbt.
 414  */
 415 int
 416 xfs_rui_recover(
 417         struct xfs_mount                *mp,
 418         struct xfs_rui_log_item         *ruip)
 419 {
 420         int                             i;
 421         int                             error = 0;
 422         struct xfs_map_extent           *rmap;
 423         xfs_fsblock_t                   startblock_fsb;
 424         bool                            op_ok;
 425         struct xfs_rud_log_item         *rudp;
 426         enum xfs_rmap_intent_type       type;
 427         int                             whichfork;
 428         xfs_exntst_t                    state;
 429         struct xfs_trans                *tp;
 430         struct xfs_btree_cur            *rcur = NULL;
 431
 432         ASSERT(!test_bit(XFS_RUI_RECOVERED, &ruip->rui_flags));
 433
 434         /*
 435          * First check the validity of the extents described by the
 436          * RUI.  If any are bad, then assume that all are bad and
 437          * just toss the RUI.
 438          */
 439         for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
 440                 rmap = &ruip->rui_format.rui_extents[i];
 441                 startblock_fsb = XFS_BB_TO_FSB(mp,
 442                                    XFS_FSB_TO_DADDR(mp, rmap->me_startblock));
 443                 switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
 444                 case XFS_RMAP_EXTENT_MAP:
 445                 case XFS_RMAP_EXTENT_MAP_SHARED:
 446                 case XFS_RMAP_EXTENT_UNMAP:
 447                 case XFS_RMAP_EXTENT_UNMAP_SHARED:
 448                 case XFS_RMAP_EXTENT_CONVERT:
 449                 case XFS_RMAP_EXTENT_CONVERT_SHARED:
 450                 case XFS_RMAP_EXTENT_ALLOC:
 451                 case XFS_RMAP_EXTENT_FREE:
 452                         op_ok = true;
 453                         break;
 454                 default:
 455                         op_ok = false;
 456                         break;
 457                 }
 458                 if (!op_ok || startblock_fsb == 0 ||
 459                     rmap->me_len == 0 ||
 460                     startblock_fsb >= mp->m_sb.sb_dblocks ||
 461                     rmap->me_len >= mp->m_sb.sb_agblocks ||
 462                     (rmap->me_flags & ~XFS_RMAP_EXTENT_FLAGS)) {
 463                         /*
 464                          * This will pull the RUI from the AIL and
 465                          * free the memory associated with it.
 466                          */
 467                         set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
 468                         xfs_rui_release(ruip);
 469                         return -EIO;
 470                 }
 471         }
 472
 473         error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
 474         if (error)
 475                 return error;
 476         rudp = xfs_trans_get_rud(tp, ruip);
 477
 478         for (i = 0; i < ruip->rui_format.rui_nextents; i++) {
 479                 rmap = &ruip->rui_format.rui_extents[i];
 480                 state = (rmap->me_flags & XFS_RMAP_EXTENT_UNWRITTEN) ?
 481                                 XFS_EXT_UNWRITTEN : XFS_EXT_NORM;
 482                 whichfork = (rmap->me_flags & XFS_RMAP_EXTENT_ATTR_FORK) ?
 483                                 XFS_ATTR_FORK : XFS_DATA_FORK;
 484                 switch (rmap->me_flags & XFS_RMAP_EXTENT_TYPE_MASK) {
 485                 case XFS_RMAP_EXTENT_MAP:
 486                         type = XFS_RMAP_MAP;
 487                         break;
 488                 case XFS_RMAP_EXTENT_MAP_SHARED:
 489                         type = XFS_RMAP_MAP_SHARED;
 490                         break;
 491                 case XFS_RMAP_EXTENT_UNMAP:
 492                         type = XFS_RMAP_UNMAP;
 493                         break;
 494                 case XFS_RMAP_EXTENT_UNMAP_SHARED:
 495                         type = XFS_RMAP_UNMAP_SHARED;
 496                         break;
 497                 case XFS_RMAP_EXTENT_CONVERT:
 498                         type = XFS_RMAP_CONVERT;
 499                         break;
 500                 case XFS_RMAP_EXTENT_CONVERT_SHARED:
 501                         type = XFS_RMAP_CONVERT_SHARED;
 502                         break;
 503                 case XFS_RMAP_EXTENT_ALLOC:
 504                         type = XFS_RMAP_ALLOC;
 505                         break;
 506                 case XFS_RMAP_EXTENT_FREE:
 507                         type = XFS_RMAP_FREE;
 508                         break;
 509                 default:
 510                         error = -EFSCORRUPTED;
 511                         goto abort_error;
 512                 }
 513                 error = xfs_trans_log_finish_rmap_update(tp, rudp, type,
 514                                 rmap->me_owner, whichfork,
 515                                 rmap->me_startoff, rmap->me_startblock,
 516                                 rmap->me_len, state, &rcur);
 517                 if (error)
 518                         goto abort_error;
 519
 520         }
 521
 522         xfs_rmap_finish_one_cleanup(tp, rcur, error);
 523         set_bit(XFS_RUI_RECOVERED, &ruip->rui_flags);
 524         error = xfs_trans_commit(tp);
 525         return error;
 526
 527 abort_error:
 528         xfs_rmap_finish_one_cleanup(tp, rcur, error);
 529         xfs_trans_cancel(tp);
 530         return error;
 531 }