fs/xfs/xfs_inode_item.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_format.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_inode.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_inode_item.h"
  29 #include "xfs_error.h"
  30 #include "xfs_trace.h"
  31 #include "xfs_trans_priv.h"
  32 #include "xfs_dinode.h"
  33 #include "xfs_log.h"
  34
  35
  36 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  37
  38 static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
  39 {
  40         return container_of(lip, struct xfs_inode_log_item, ili_item);
  41 }
  42
  43 STATIC void
  44 xfs_inode_item_data_fork_size(
  45         struct xfs_inode_log_item *iip,
  46         int                     *nvecs,
  47         int                     *nbytes)
  48 {
  49         struct xfs_inode        *ip = iip->ili_inode;
  50
  51         switch (ip->i_d.di_format) {
  52         case XFS_DINODE_FMT_EXTENTS:
  53                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
  54                     ip->i_d.di_nextents > 0 &&
  55                     ip->i_df.if_bytes > 0) {
  56                         /* worst case, doesn't subtract delalloc extents */
  57                         *nbytes += XFS_IFORK_DSIZE(ip);
  58                         *nvecs += 1;
  59                 }
  60                 break;
  61         case XFS_DINODE_FMT_BTREE:
  62                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
  63                     ip->i_df.if_broot_bytes > 0) {
  64                         *nbytes += ip->i_df.if_broot_bytes;
  65                         *nvecs += 1;
  66                 }
  67                 break;
  68         case XFS_DINODE_FMT_LOCAL:
  69                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
  70                     ip->i_df.if_bytes > 0) {
  71                         *nbytes += roundup(ip->i_df.if_bytes, 4);
  72                         *nvecs += 1;
  73                 }
  74                 break;
  75
  76         case XFS_DINODE_FMT_DEV:
  77         case XFS_DINODE_FMT_UUID:
  78                 break;
  79         default:
  80                 ASSERT(0);
  81                 break;
  82         }
  83 }
  84
  85 STATIC void
  86 xfs_inode_item_attr_fork_size(
  87         struct xfs_inode_log_item *iip,
  88         int                     *nvecs,
  89         int                     *nbytes)
  90 {
  91         struct xfs_inode        *ip = iip->ili_inode;
  92
  93         switch (ip->i_d.di_aformat) {
  94         case XFS_DINODE_FMT_EXTENTS:
  95                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
  96                     ip->i_d.di_anextents > 0 &&
  97                     ip->i_afp->if_bytes > 0) {
  98                         /* worst case, doesn't subtract unused space */
  99                         *nbytes += XFS_IFORK_ASIZE(ip);
 100                         *nvecs += 1;
 101                 }
 102                 break;
 103         case XFS_DINODE_FMT_BTREE:
 104                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 105                     ip->i_afp->if_broot_bytes > 0) {
 106                         *nbytes += ip->i_afp->if_broot_bytes;
 107                         *nvecs += 1;
 108                 }
 109                 break;
 110         case XFS_DINODE_FMT_LOCAL:
 111                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 112                     ip->i_afp->if_bytes > 0) {
 113                         *nbytes += roundup(ip->i_afp->if_bytes, 4);
 114                         *nvecs += 1;
 115                 }
 116                 break;
 117         default:
 118                 ASSERT(0);
 119                 break;
 120         }
 121 }
 122
 123 /*
 124  * This returns the number of iovecs needed to log the given inode item.
 125  *
 126  * We need one iovec for the inode log format structure, one for the
 127  * inode core, and possibly one for the inode data/extents/b-tree root
 128  * and one for the inode attribute data/extents/b-tree root.
 129  */
 130 STATIC void
 131 xfs_inode_item_size(
 132         struct xfs_log_item     *lip,
 133         int                     *nvecs,
 134         int                     *nbytes)
 135 {
 136         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 137         struct xfs_inode        *ip = iip->ili_inode;
 138
 139         *nvecs += 2;
 140         *nbytes += sizeof(struct xfs_inode_log_format) +
 141                    xfs_icdinode_size(ip->i_d.di_version);
 142
 143         xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
 144         if (XFS_IFORK_Q(ip))
 145                 xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
 146 }
 147
 148 STATIC void
 149 xfs_inode_item_format_data_fork(
 150         struct xfs_inode_log_item *iip,
 151         struct xfs_inode_log_format *ilf,
 152         struct xfs_log_vec      *lv,
 153         struct xfs_log_iovec    **vecp)
 154 {
 155         struct xfs_inode        *ip = iip->ili_inode;
 156         size_t                  data_bytes;
 157
 158         switch (ip->i_d.di_format) {
 159         case XFS_DINODE_FMT_EXTENTS:
 160                 iip->ili_fields &=
 161                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 162                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 163
 164                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
 165                     ip->i_d.di_nextents > 0 &&
 166                     ip->i_df.if_bytes > 0) {
 167                         struct xfs_bmbt_rec *p;
 168
 169                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 170                         ASSERT(ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) > 0);
 171
 172                         p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT);
 173                         data_bytes = xfs_iextents_copy(ip, p, XFS_DATA_FORK);
 174                         xlog_finish_iovec(lv, *vecp, data_bytes);
 175
 176                         ASSERT(data_bytes <= ip->i_df.if_bytes);
 177
 178                         ilf->ilf_dsize = data_bytes;
 179                         ilf->ilf_size++;
 180                 } else {
 181                         iip->ili_fields &= ~XFS_ILOG_DEXT;
 182                 }
 183                 break;
 184         case XFS_DINODE_FMT_BTREE:
 185                 iip->ili_fields &=
 186                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 187                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 188
 189                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 190                     ip->i_df.if_broot_bytes > 0) {
 191                         ASSERT(ip->i_df.if_broot != NULL);
 192                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IBROOT,
 193                                         ip->i_df.if_broot,
 194                                         ip->i_df.if_broot_bytes);
 195                         ilf->ilf_dsize = ip->i_df.if_broot_bytes;
 196                         ilf->ilf_size++;
 197                 } else {
 198                         ASSERT(!(iip->ili_fields &
 199                                  XFS_ILOG_DBROOT));
 200                         iip->ili_fields &= ~XFS_ILOG_DBROOT;
 201                 }
 202                 break;
 203         case XFS_DINODE_FMT_LOCAL:
 204                 iip->ili_fields &=
 205                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 206                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 207                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 208                     ip->i_df.if_bytes > 0) {
 209                         /*
 210                          * Round i_bytes up to a word boundary.
 211                          * The underlying memory is guaranteed to
 212                          * to be there by xfs_idata_realloc().
 213                          */
 214                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 215                         ASSERT(ip->i_df.if_real_bytes == 0 ||
 216                                ip->i_df.if_real_bytes == data_bytes);
 217                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 218                         ASSERT(ip->i_d.di_size > 0);
 219                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_ILOCAL,
 220                                         ip->i_df.if_u1.if_data, data_bytes);
 221                         ilf->ilf_dsize = (unsigned)data_bytes;
 222                         ilf->ilf_size++;
 223                 } else {
 224                         iip->ili_fields &= ~XFS_ILOG_DDATA;
 225                 }
 226                 break;
 227         case XFS_DINODE_FMT_DEV:
 228                 iip->ili_fields &=
 229                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 230                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 231                 if (iip->ili_fields & XFS_ILOG_DEV)
 232                         ilf->ilf_u.ilfu_rdev = ip->i_df.if_u2.if_rdev;
 233                 break;
 234         case XFS_DINODE_FMT_UUID:
 235                 iip->ili_fields &=
 236                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 237                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 238                 if (iip->ili_fields & XFS_ILOG_UUID)
 239                         ilf->ilf_u.ilfu_uuid = ip->i_df.if_u2.if_uuid;
 240                 break;
 241         default:
 242                 ASSERT(0);
 243                 break;
 244         }
 245 }
 246
 247 STATIC void
 248 xfs_inode_item_format_attr_fork(
 249         struct xfs_inode_log_item *iip,
 250         struct xfs_inode_log_format *ilf,
 251         struct xfs_log_vec      *lv,
 252         struct xfs_log_iovec    **vecp)
 253 {
 254         struct xfs_inode        *ip = iip->ili_inode;
 255         size_t                  data_bytes;
 256
 257         switch (ip->i_d.di_aformat) {
 258         case XFS_DINODE_FMT_EXTENTS:
 259                 iip->ili_fields &=
 260                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 261
 262                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
 263                     ip->i_d.di_anextents > 0 &&
 264                     ip->i_afp->if_bytes > 0) {
 265                         struct xfs_bmbt_rec *p;
 266
 267                         ASSERT(ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) ==
 268                                 ip->i_d.di_anextents);
 269                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 270
 271                         p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_EXT);
 272                         data_bytes = xfs_iextents_copy(ip, p, XFS_ATTR_FORK);
 273                         xlog_finish_iovec(lv, *vecp, data_bytes);
 274
 275                         ilf->ilf_asize = data_bytes;
 276                         ilf->ilf_size++;
 277                 } else {
 278                         iip->ili_fields &= ~XFS_ILOG_AEXT;
 279                 }
 280                 break;
 281         case XFS_DINODE_FMT_BTREE:
 282                 iip->ili_fields &=
 283                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 284
 285                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 286                     ip->i_afp->if_broot_bytes > 0) {
 287                         ASSERT(ip->i_afp->if_broot != NULL);
 288
 289                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_BROOT,
 290                                         ip->i_afp->if_broot,
 291                                         ip->i_afp->if_broot_bytes);
 292                         ilf->ilf_asize = ip->i_afp->if_broot_bytes;
 293                         ilf->ilf_size++;
 294                 } else {
 295                         iip->ili_fields &= ~XFS_ILOG_ABROOT;
 296                 }
 297                 break;
 298         case XFS_DINODE_FMT_LOCAL:
 299                 iip->ili_fields &=
 300                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 301
 302                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 303                     ip->i_afp->if_bytes > 0) {
 304                         /*
 305                          * Round i_bytes up to a word boundary.
 306                          * The underlying memory is guaranteed to
 307                          * to be there by xfs_idata_realloc().
 308                          */
 309                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 310                         ASSERT(ip->i_afp->if_real_bytes == 0 ||
 311                                ip->i_afp->if_real_bytes == data_bytes);
 312                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 313                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_LOCAL,
 314                                         ip->i_afp->if_u1.if_data,
 315                                         data_bytes);
 316                         ilf->ilf_asize = (unsigned)data_bytes;
 317                         ilf->ilf_size++;
 318                 } else {
 319                         iip->ili_fields &= ~XFS_ILOG_ADATA;
 320                 }
 321                 break;
 322         default:
 323                 ASSERT(0);
 324                 break;
 325         }
 326 }
 327
 328 /*
 329  * This is called to fill in the vector of log iovecs for the given inode
 330  * log item.  It fills the first item with an inode log format structure,
 331  * the second with the on-disk inode structure, and a possible third and/or
 332  * fourth with the inode data/extents/b-tree root and inode attributes
 333  * data/extents/b-tree root.
 334  */
 335 STATIC void
 336 xfs_inode_item_format(
 337         struct xfs_log_item     *lip,
 338         struct xfs_log_vec      *lv)
 339 {
 340         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 341         struct xfs_inode        *ip = iip->ili_inode;
 342         struct xfs_inode_log_format *ilf;
 343         struct xfs_log_iovec    *vecp = NULL;
 344
 345         ASSERT(ip->i_d.di_version > 1);
 346
 347         ilf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_IFORMAT);
 348         ilf->ilf_type = XFS_LI_INODE;
 349         ilf->ilf_ino = ip->i_ino;
 350         ilf->ilf_blkno = ip->i_imap.im_blkno;
 351         ilf->ilf_len = ip->i_imap.im_len;
 352         ilf->ilf_boffset = ip->i_imap.im_boffset;
 353         ilf->ilf_fields = XFS_ILOG_CORE;
 354         ilf->ilf_size = 2; /* format + core */
 355         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_inode_log_format));
 356
 357         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICORE,
 358                         &ip->i_d,
 359                         xfs_icdinode_size(ip->i_d.di_version));
 360
 361         xfs_inode_item_format_data_fork(iip, ilf, lv, &vecp);
 362         if (XFS_IFORK_Q(ip)) {
 363                 xfs_inode_item_format_attr_fork(iip, ilf, lv, &vecp);
 364         } else {
 365                 iip->ili_fields &=
 366                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 367         }
 368
 369         /* update the format with the exact fields we actually logged */
 370         ilf->ilf_fields |= (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
 371 }
 372
 373 /*
 374  * This is called to pin the inode associated with the inode log
 375  * item in memory so it cannot be written out.
 376  */
 377 STATIC void
 378 xfs_inode_item_pin(
 379         struct xfs_log_item     *lip)
 380 {
 381         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 382
 383         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 384
 385         trace_xfs_inode_pin(ip, _RET_IP_);
 386         atomic_inc(&ip->i_pincount);
 387 }
 388
 389
 390 /*
 391  * This is called to unpin the inode associated with the inode log
 392  * item which was previously pinned with a call to xfs_inode_item_pin().
 393  *
 394  * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 395  */
 396 STATIC void
 397 xfs_inode_item_unpin(
 398         struct xfs_log_item     *lip,
 399         int                     remove)
 400 {
 401         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 402
 403         trace_xfs_inode_unpin(ip, _RET_IP_);
 404         ASSERT(atomic_read(&ip->i_pincount) > 0);
 405         if (atomic_dec_and_test(&ip->i_pincount))
 406                 wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
 407 }
 408
 409 STATIC uint
 410 xfs_inode_item_push(
 411         struct xfs_log_item     *lip,
 412         struct list_head        *buffer_list)
 413 {
 414         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 415         struct xfs_inode        *ip = iip->ili_inode;
 416         struct xfs_buf          *bp = NULL;
 417         uint                    rval = XFS_ITEM_SUCCESS;
 418         int                     error;
 419
 420         if (xfs_ipincount(ip) > 0)
 421                 return XFS_ITEM_PINNED;
 422
 423         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
 424                 return XFS_ITEM_LOCKED;
 425
 426         /*
 427          * Re-check the pincount now that we stabilized the value by
 428          * taking the ilock.
 429          */
 430         if (xfs_ipincount(ip) > 0) {
 431                 rval = XFS_ITEM_PINNED;
 432                 goto out_unlock;
 433         }
 434
 435         /*
 436          * Stale inode items should force out the iclog.
 437          */
 438         if (ip->i_flags & XFS_ISTALE) {
 439                 rval = XFS_ITEM_PINNED;
 440                 goto out_unlock;
 441         }
 442
 443         /*
 444          * Someone else is already flushing the inode.  Nothing we can do
 445          * here but wait for the flush to finish and remove the item from
 446          * the AIL.
 447          */
 448         if (!xfs_iflock_nowait(ip)) {
 449                 rval = XFS_ITEM_FLUSHING;
 450                 goto out_unlock;
 451         }
 452
 453         ASSERT(iip->ili_fields != 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 454         ASSERT(iip->ili_logged == 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 455
 456         spin_unlock(&lip->li_ailp->xa_lock);
 457
 458         error = xfs_iflush(ip, &bp);
 459         if (!error) {
 460                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 461                         rval = XFS_ITEM_FLUSHING;
 462                 xfs_buf_relse(bp);
 463         }
 464
 465         spin_lock(&lip->li_ailp->xa_lock);
 466 out_unlock:
 467         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 468         return rval;
 469 }
 470
 471 /*
 472  * Unlock the inode associated with the inode log item.
 473  * Clear the fields of the inode and inode log item that
 474  * are specific to the current transaction.  If the
 475  * hold flags is set, do not unlock the inode.
 476  */
 477 STATIC void
 478 xfs_inode_item_unlock(
 479         struct xfs_log_item     *lip)
 480 {
 481         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 482         struct xfs_inode        *ip = iip->ili_inode;
 483         unsigned short          lock_flags;
 484
 485         ASSERT(ip->i_itemp != NULL);
 486         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 487
 488         lock_flags = iip->ili_lock_flags;
 489         iip->ili_lock_flags = 0;
 490         if (lock_flags)
 491                 xfs_iunlock(ip, lock_flags);
 492 }
 493
 494 /*
 495  * This is called to find out where the oldest active copy of the inode log
 496  * item in the on disk log resides now that the last log write of it completed
 497  * at the given lsn.  Since we always re-log all dirty data in an inode, the
 498  * latest copy in the on disk log is the only one that matters.  Therefore,
 499  * simply return the given lsn.
 500  *
 501  * If the inode has been marked stale because the cluster is being freed, we
 502  * don't want to (re-)insert this inode into the AIL. There is a race condition
 503  * where the cluster buffer may be unpinned before the inode is inserted into
 504  * the AIL during transaction committed processing. If the buffer is unpinned
 505  * before the inode item has been committed and inserted, then it is possible
 506  * for the buffer to be written and IO completes before the inode is inserted
 507  * into the AIL. In that case, we'd be inserting a clean, stale inode into the
 508  * AIL which will never get removed. It will, however, get reclaimed which
 509  * triggers an assert in xfs_inode_free() complaining about freein an inode
 510  * still in the AIL.
 511  *
 512  * To avoid this, just unpin the inode directly and return a LSN of -1 so the
 513  * transaction committed code knows that it does not need to do any further
 514  * processing on the item.
 515  */
 516 STATIC xfs_lsn_t
 517 xfs_inode_item_committed(
 518         struct xfs_log_item     *lip,
 519         xfs_lsn_t               lsn)
 520 {
 521         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 522         struct xfs_inode        *ip = iip->ili_inode;
 523
 524         if (xfs_iflags_test(ip, XFS_ISTALE)) {
 525                 xfs_inode_item_unpin(lip, 0);
 526                 return -1;
 527         }
 528         return lsn;
 529 }
 530
 531 /*
 532  * XXX rcc - this one really has to do something.  Probably needs
 533  * to stamp in a new field in the incore inode.
 534  */
 535 STATIC void
 536 xfs_inode_item_committing(
 537         struct xfs_log_item     *lip,
 538         xfs_lsn_t               lsn)
 539 {
 540         INODE_ITEM(lip)->ili_last_lsn = lsn;
 541 }
 542
 543 /*
 544  * This is the ops vector shared by all buf log items.
 545  */
 546 static const struct xfs_item_ops xfs_inode_item_ops = {
 547         .iop_size       = xfs_inode_item_size,
 548         .iop_format     = xfs_inode_item_format,
 549         .iop_pin        = xfs_inode_item_pin,
 550         .iop_unpin      = xfs_inode_item_unpin,
 551         .iop_unlock     = xfs_inode_item_unlock,
 552         .iop_committed  = xfs_inode_item_committed,
 553         .iop_push       = xfs_inode_item_push,
 554         .iop_committing = xfs_inode_item_committing
 555 };
 556
 557
 558 /*
 559  * Initialize the inode log item for a newly allocated (in-core) inode.
 560  */
 561 void
 562 xfs_inode_item_init(
 563         struct xfs_inode        *ip,
 564         struct xfs_mount        *mp)
 565 {
 566         struct xfs_inode_log_item *iip;
 567
 568         ASSERT(ip->i_itemp == NULL);
 569         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 570
 571         iip->ili_inode = ip;
 572         xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
 573                                                 &xfs_inode_item_ops);
 574 }
 575
 576 /*
 577  * Free the inode log item and any memory hanging off of it.
 578  */
 579 void
 580 xfs_inode_item_destroy(
 581         xfs_inode_t     *ip)
 582 {
 583         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 584 }
 585
 586
 587 /*
 588  * This is the inode flushing I/O completion routine.  It is called
 589  * from interrupt level when the buffer containing the inode is
 590  * flushed to disk.  It is responsible for removing the inode item
 591  * from the AIL if it has not been re-logged, and unlocking the inode's
 592  * flush lock.
 593  *
 594  * To reduce AIL lock traffic as much as possible, we scan the buffer log item
 595  * list for other inodes that will run this function. We remove them from the
 596  * buffer list so we can process all the inode IO completions in one AIL lock
 597  * traversal.
 598  */
 599 void
 600 xfs_iflush_done(
 601         struct xfs_buf          *bp,
 602         struct xfs_log_item     *lip)
 603 {
 604         struct xfs_inode_log_item *iip;
 605         struct xfs_log_item     *blip;
 606         struct xfs_log_item     *next;
 607         struct xfs_log_item     *prev;
 608         struct xfs_ail          *ailp = lip->li_ailp;
 609         int                     need_ail = 0;
 610
 611         /*
 612          * Scan the buffer IO completions for other inodes being completed and
 613          * attach them to the current inode log item.
 614          */
 615         blip = bp->b_fspriv;
 616         prev = NULL;
 617         while (blip != NULL) {
 618                 if (lip->li_cb != xfs_iflush_done) {
 619                         prev = blip;
 620                         blip = blip->li_bio_list;
 621                         continue;
 622                 }
 623
 624                 /* remove from list */
 625                 next = blip->li_bio_list;
 626                 if (!prev) {
 627                         bp->b_fspriv = next;
 628                 } else {
 629                         prev->li_bio_list = next;
 630                 }
 631
 632                 /* add to current list */
 633                 blip->li_bio_list = lip->li_bio_list;
 634                 lip->li_bio_list = blip;
 635
 636                 /*
 637                  * while we have the item, do the unlocked check for needing
 638                  * the AIL lock.
 639                  */
 640                 iip = INODE_ITEM(blip);
 641                 if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
 642                         need_ail++;
 643
 644                 blip = next;
 645         }
 646
 647         /* make sure we capture the state of the initial inode. */
 648         iip = INODE_ITEM(lip);
 649         if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
 650                 need_ail++;
 651
 652         /*
 653          * We only want to pull the item from the AIL if it is
 654          * actually there and its location in the log has not
 655          * changed since we started the flush.  Thus, we only bother
 656          * if the ili_logged flag is set and the inode's lsn has not
 657          * changed.  First we check the lsn outside
 658          * the lock since it's cheaper, and then we recheck while
 659          * holding the lock before removing the inode from the AIL.
 660          */
 661         if (need_ail) {
 662                 struct xfs_log_item *log_items[need_ail];
 663                 int i = 0;
 664                 spin_lock(&ailp->xa_lock);
 665                 for (blip = lip; blip; blip = blip->li_bio_list) {
 666                         iip = INODE_ITEM(blip);
 667                         if (iip->ili_logged &&
 668                             blip->li_lsn == iip->ili_flush_lsn) {
 669                                 log_items[i++] = blip;
 670                         }
 671                         ASSERT(i <= need_ail);
 672                 }
 673                 /* xfs_trans_ail_delete_bulk() drops the AIL lock. */
 674                 xfs_trans_ail_delete_bulk(ailp, log_items, i,
 675                                           SHUTDOWN_CORRUPT_INCORE);
 676         }
 677
 678
 679         /*
 680          * clean up and unlock the flush lock now we are done. We can clear the
 681          * ili_last_fields bits now that we know that the data corresponding to
 682          * them is safely on disk.
 683          */
 684         for (blip = lip; blip; blip = next) {
 685                 next = blip->li_bio_list;
 686                 blip->li_bio_list = NULL;
 687
 688                 iip = INODE_ITEM(blip);
 689                 iip->ili_logged = 0;
 690                 iip->ili_last_fields = 0;
 691                 xfs_ifunlock(iip->ili_inode);
 692         }
 693 }
 694
 695 /*
 696  * This is the inode flushing abort routine.  It is called from xfs_iflush when
 697  * the filesystem is shutting down to clean up the inode state.  It is
 698  * responsible for removing the inode item from the AIL if it has not been
 699  * re-logged, and unlocking the inode's flush lock.
 700  */
 701 void
 702 xfs_iflush_abort(
 703         xfs_inode_t             *ip,
 704         bool                    stale)
 705 {
 706         xfs_inode_log_item_t    *iip = ip->i_itemp;
 707
 708         if (iip) {
 709                 struct xfs_ail  *ailp = iip->ili_item.li_ailp;
 710                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 711                         spin_lock(&ailp->xa_lock);
 712                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 713                                 /* xfs_trans_ail_delete() drops the AIL lock. */
 714                                 xfs_trans_ail_delete(ailp, &iip->ili_item,
 715                                                 stale ?
 716                                                      SHUTDOWN_LOG_IO_ERROR :
 717                                                      SHUTDOWN_CORRUPT_INCORE);
 718                         } else
 719                                 spin_unlock(&ailp->xa_lock);
 720                 }
 721                 iip->ili_logged = 0;
 722                 /*
 723                  * Clear the ili_last_fields bits now that we know that the
 724                  * data corresponding to them is safely on disk.
 725                  */
 726                 iip->ili_last_fields = 0;
 727                 /*
 728                  * Clear the inode logging fields so no more flushes are
 729                  * attempted.
 730                  */
 731                 iip->ili_fields = 0;
 732         }
 733         /*
 734          * Release the inode's flush lock since we're done with it.
 735          */
 736         xfs_ifunlock(ip);
 737 }
 738
 739 void
 740 xfs_istale_done(
 741         struct xfs_buf          *bp,
 742         struct xfs_log_item     *lip)
 743 {
 744         xfs_iflush_abort(INODE_ITEM(lip)->ili_inode, true);
 745 }
 746
 747 /*
 748  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
 749  * (which can have different field alignments) to the native version
 750  */
 751 int
 752 xfs_inode_item_format_convert(
 753         xfs_log_iovec_t         *buf,
 754         xfs_inode_log_format_t  *in_f)
 755 {
 756         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
 757                 xfs_inode_log_format_32_t *in_f32 = buf->i_addr;
 758
 759                 in_f->ilf_type = in_f32->ilf_type;
 760                 in_f->ilf_size = in_f32->ilf_size;
 761                 in_f->ilf_fields = in_f32->ilf_fields;
 762                 in_f->ilf_asize = in_f32->ilf_asize;
 763                 in_f->ilf_dsize = in_f32->ilf_dsize;
 764                 in_f->ilf_ino = in_f32->ilf_ino;
 765                 /* copy biggest field of ilf_u */
 766                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 767                        in_f32->ilf_u.ilfu_uuid.__u_bits,
 768                        sizeof(uuid_t));
 769                 in_f->ilf_blkno = in_f32->ilf_blkno;
 770                 in_f->ilf_len = in_f32->ilf_len;
 771                 in_f->ilf_boffset = in_f32->ilf_boffset;
 772                 return 0;
 773         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
 774                 xfs_inode_log_format_64_t *in_f64 = buf->i_addr;
 775
 776                 in_f->ilf_type = in_f64->ilf_type;
 777                 in_f->ilf_size = in_f64->ilf_size;
 778                 in_f->ilf_fields = in_f64->ilf_fields;
 779                 in_f->ilf_asize = in_f64->ilf_asize;
 780                 in_f->ilf_dsize = in_f64->ilf_dsize;
 781                 in_f->ilf_ino = in_f64->ilf_ino;
 782                 /* copy biggest field of ilf_u */
 783                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 784                        in_f64->ilf_u.ilfu_uuid.__u_bits,
 785                        sizeof(uuid_t));
 786                 in_f->ilf_blkno = in_f64->ilf_blkno;
 787                 in_f->ilf_len = in_f64->ilf_len;
 788                 in_f->ilf_boffset = in_f64->ilf_boffset;
 789                 return 0;
 790         }
 791         return -EFSCORRUPTED;
 792 }