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_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_trans.h"
  23 #include "xfs_sb.h"
  24 #include "xfs_ag.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_trans_priv.h"
  27 #include "xfs_bmap_btree.h"
  28 #include "xfs_dinode.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_inode_item.h"
  31 #include "xfs_error.h"
  32 #include "xfs_trace.h"
  33
  34
  35 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  36
  37 static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
  38 {
  39         return container_of(lip, struct xfs_inode_log_item, ili_item);
  40 }
  41
  42
  43 /*
  44  * This returns the number of iovecs needed to log the given inode item.
  45  *
  46  * We need one iovec for the inode log format structure, one for the
  47  * inode core, and possibly one for the inode data/extents/b-tree root
  48  * and one for the inode attribute data/extents/b-tree root.
  49  */
  50 STATIC uint
  51 xfs_inode_item_size(
  52         struct xfs_log_item     *lip)
  53 {
  54         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
  55         struct xfs_inode        *ip = iip->ili_inode;
  56         uint                    nvecs = 2;
  57
  58         switch (ip->i_d.di_format) {
  59         case XFS_DINODE_FMT_EXTENTS:
  60                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
  61                     ip->i_d.di_nextents > 0 &&
  62                     ip->i_df.if_bytes > 0)
  63                         nvecs++;
  64                 break;
  65
  66         case XFS_DINODE_FMT_BTREE:
  67                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
  68                     ip->i_df.if_broot_bytes > 0)
  69                         nvecs++;
  70                 break;
  71
  72         case XFS_DINODE_FMT_LOCAL:
  73                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
  74                     ip->i_df.if_bytes > 0)
  75                         nvecs++;
  76                 break;
  77
  78         case XFS_DINODE_FMT_DEV:
  79         case XFS_DINODE_FMT_UUID:
  80                 break;
  81
  82         default:
  83                 ASSERT(0);
  84                 break;
  85         }
  86
  87         if (!XFS_IFORK_Q(ip))
  88                 return nvecs;
  89
  90
  91         /*
  92          * Log any necessary attribute data.
  93          */
  94         switch (ip->i_d.di_aformat) {
  95         case XFS_DINODE_FMT_EXTENTS:
  96                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
  97                     ip->i_d.di_anextents > 0 &&
  98                     ip->i_afp->if_bytes > 0)
  99                         nvecs++;
 100                 break;
 101
 102         case XFS_DINODE_FMT_BTREE:
 103                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 104                     ip->i_afp->if_broot_bytes > 0)
 105                         nvecs++;
 106                 break;
 107
 108         case XFS_DINODE_FMT_LOCAL:
 109                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 110                     ip->i_afp->if_bytes > 0)
 111                         nvecs++;
 112                 break;
 113
 114         default:
 115                 ASSERT(0);
 116                 break;
 117         }
 118
 119         return nvecs;
 120 }
 121
 122 /*
 123  * xfs_inode_item_format_extents - convert in-core extents to on-disk form
 124  *
 125  * For either the data or attr fork in extent format, we need to endian convert
 126  * the in-core extent as we place them into the on-disk inode. In this case, we
 127  * need to do this conversion before we write the extents into the log. Because
 128  * we don't have the disk inode to write into here, we allocate a buffer and
 129  * format the extents into it via xfs_iextents_copy(). We free the buffer in
 130  * the unlock routine after the copy for the log has been made.
 131  *
 132  * In the case of the data fork, the in-core and on-disk fork sizes can be
 133  * different due to delayed allocation extents. We only log on-disk extents
 134  * here, so always use the physical fork size to determine the size of the
 135  * buffer we need to allocate.
 136  */
 137 STATIC void
 138 xfs_inode_item_format_extents(
 139         struct xfs_inode        *ip,
 140         struct xfs_log_iovec    *vecp,
 141         int                     whichfork,
 142         int                     type)
 143 {
 144         xfs_bmbt_rec_t          *ext_buffer;
 145
 146         ext_buffer = kmem_alloc(XFS_IFORK_SIZE(ip, whichfork), KM_SLEEP);
 147         if (whichfork == XFS_DATA_FORK)
 148                 ip->i_itemp->ili_extents_buf = ext_buffer;
 149         else
 150                 ip->i_itemp->ili_aextents_buf = ext_buffer;
 151
 152         vecp->i_addr = ext_buffer;
 153         vecp->i_len = xfs_iextents_copy(ip, ext_buffer, whichfork);
 154         vecp->i_type = type;
 155 }
 156
 157 /*
 158  * This is called to fill in the vector of log iovecs for the
 159  * given inode log item.  It fills the first item with an inode
 160  * log format structure, the second with the on-disk inode structure,
 161  * and a possible third and/or fourth with the inode data/extents/b-tree
 162  * root and inode attributes data/extents/b-tree root.
 163  */
 164 STATIC void
 165 xfs_inode_item_format(
 166         struct xfs_log_item     *lip,
 167         struct xfs_log_iovec    *vecp)
 168 {
 169         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 170         struct xfs_inode        *ip = iip->ili_inode;
 171         uint                    nvecs;
 172         size_t                  data_bytes;
 173         xfs_mount_t             *mp;
 174
 175         vecp->i_addr = &iip->ili_format;
 176         vecp->i_len  = sizeof(xfs_inode_log_format_t);
 177         vecp->i_type = XLOG_REG_TYPE_IFORMAT;
 178         vecp++;
 179         nvecs        = 1;
 180
 181         vecp->i_addr = &ip->i_d;
 182         vecp->i_len  = sizeof(struct xfs_icdinode);
 183         vecp->i_type = XLOG_REG_TYPE_ICORE;
 184         vecp++;
 185         nvecs++;
 186
 187         /*
 188          * If this is really an old format inode, then we need to
 189          * log it as such.  This means that we have to copy the link
 190          * count from the new field to the old.  We don't have to worry
 191          * about the new fields, because nothing trusts them as long as
 192          * the old inode version number is there.  If the superblock already
 193          * has a new version number, then we don't bother converting back.
 194          */
 195         mp = ip->i_mount;
 196         ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
 197         if (ip->i_d.di_version == 1) {
 198                 if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
 199                         /*
 200                          * Convert it back.
 201                          */
 202                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
 203                         ip->i_d.di_onlink = ip->i_d.di_nlink;
 204                 } else {
 205                         /*
 206                          * The superblock version has already been bumped,
 207                          * so just make the conversion to the new inode
 208                          * format permanent.
 209                          */
 210                         ip->i_d.di_version = 2;
 211                         ip->i_d.di_onlink = 0;
 212                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
 213                 }
 214         }
 215
 216         switch (ip->i_d.di_format) {
 217         case XFS_DINODE_FMT_EXTENTS:
 218                 iip->ili_fields &=
 219                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 220                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 221
 222                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
 223                     ip->i_d.di_nextents > 0 &&
 224                     ip->i_df.if_bytes > 0) {
 225                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 226                         ASSERT(ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) > 0);
 227                         ASSERT(iip->ili_extents_buf == NULL);
 228
 229 #ifdef XFS_NATIVE_HOST
 230                        if (ip->i_d.di_nextents == ip->i_df.if_bytes /
 231                                                (uint)sizeof(xfs_bmbt_rec_t)) {
 232                                 /*
 233                                  * There are no delayed allocation
 234                                  * extents, so just point to the
 235                                  * real extents array.
 236                                  */
 237                                 vecp->i_addr = ip->i_df.if_u1.if_extents;
 238                                 vecp->i_len = ip->i_df.if_bytes;
 239                                 vecp->i_type = XLOG_REG_TYPE_IEXT;
 240                         } else
 241 #endif
 242                         {
 243                                 xfs_inode_item_format_extents(ip, vecp,
 244                                         XFS_DATA_FORK, XLOG_REG_TYPE_IEXT);
 245                         }
 246                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
 247                         iip->ili_format.ilf_dsize = vecp->i_len;
 248                         vecp++;
 249                         nvecs++;
 250                 } else {
 251                         iip->ili_fields &= ~XFS_ILOG_DEXT;
 252                 }
 253                 break;
 254
 255         case XFS_DINODE_FMT_BTREE:
 256                 iip->ili_fields &=
 257                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 258                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 259
 260                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 261                     ip->i_df.if_broot_bytes > 0) {
 262                         ASSERT(ip->i_df.if_broot != NULL);
 263                         vecp->i_addr = ip->i_df.if_broot;
 264                         vecp->i_len = ip->i_df.if_broot_bytes;
 265                         vecp->i_type = XLOG_REG_TYPE_IBROOT;
 266                         vecp++;
 267                         nvecs++;
 268                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 269                 } else {
 270                         ASSERT(!(iip->ili_fields &
 271                                  XFS_ILOG_DBROOT));
 272 #ifdef XFS_TRANS_DEBUG
 273                         if (iip->ili_root_size > 0) {
 274                                 ASSERT(iip->ili_root_size ==
 275                                        ip->i_df.if_broot_bytes);
 276                                 ASSERT(memcmp(iip->ili_orig_root,
 277                                             ip->i_df.if_broot,
 278                                             iip->ili_root_size) == 0);
 279                         } else {
 280                                 ASSERT(ip->i_df.if_broot_bytes == 0);
 281                         }
 282 #endif
 283                         iip->ili_fields &= ~XFS_ILOG_DBROOT;
 284                 }
 285                 break;
 286
 287         case XFS_DINODE_FMT_LOCAL:
 288                 iip->ili_fields &=
 289                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 290                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 291                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 292                     ip->i_df.if_bytes > 0) {
 293                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 294                         ASSERT(ip->i_d.di_size > 0);
 295
 296                         vecp->i_addr = ip->i_df.if_u1.if_data;
 297                         /*
 298                          * Round i_bytes up to a word boundary.
 299                          * The underlying memory is guaranteed to
 300                          * to be there by xfs_idata_realloc().
 301                          */
 302                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 303                         ASSERT((ip->i_df.if_real_bytes == 0) ||
 304                                (ip->i_df.if_real_bytes == data_bytes));
 305                         vecp->i_len = (int)data_bytes;
 306                         vecp->i_type = XLOG_REG_TYPE_ILOCAL;
 307                         vecp++;
 308                         nvecs++;
 309                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 310                 } else {
 311                         iip->ili_fields &= ~XFS_ILOG_DDATA;
 312                 }
 313                 break;
 314
 315         case XFS_DINODE_FMT_DEV:
 316                 iip->ili_fields &=
 317                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 318                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 319                 if (iip->ili_fields & XFS_ILOG_DEV) {
 320                         iip->ili_format.ilf_u.ilfu_rdev =
 321                                 ip->i_df.if_u2.if_rdev;
 322                 }
 323                 break;
 324
 325         case XFS_DINODE_FMT_UUID:
 326                 iip->ili_fields &=
 327                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 328                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 329                 if (iip->ili_fields & XFS_ILOG_UUID) {
 330                         iip->ili_format.ilf_u.ilfu_uuid =
 331                                 ip->i_df.if_u2.if_uuid;
 332                 }
 333                 break;
 334
 335         default:
 336                 ASSERT(0);
 337                 break;
 338         }
 339
 340         /*
 341          * If there are no attributes associated with the file, then we're done.
 342          */
 343         if (!XFS_IFORK_Q(ip)) {
 344                 iip->ili_fields &=
 345                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 346                 goto out;
 347         }
 348
 349         switch (ip->i_d.di_aformat) {
 350         case XFS_DINODE_FMT_EXTENTS:
 351                 iip->ili_fields &=
 352                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 353
 354                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
 355                     ip->i_d.di_anextents > 0 &&
 356                     ip->i_afp->if_bytes > 0) {
 357                         ASSERT(ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) ==
 358                                 ip->i_d.di_anextents);
 359                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 360 #ifdef XFS_NATIVE_HOST
 361                         /*
 362                          * There are not delayed allocation extents
 363                          * for attributes, so just point at the array.
 364                          */
 365                         vecp->i_addr = ip->i_afp->if_u1.if_extents;
 366                         vecp->i_len = ip->i_afp->if_bytes;
 367                         vecp->i_type = XLOG_REG_TYPE_IATTR_EXT;
 368 #else
 369                         ASSERT(iip->ili_aextents_buf == NULL);
 370                         xfs_inode_item_format_extents(ip, vecp,
 371                                         XFS_ATTR_FORK, XLOG_REG_TYPE_IATTR_EXT);
 372 #endif
 373                         iip->ili_format.ilf_asize = vecp->i_len;
 374                         vecp++;
 375                         nvecs++;
 376                 } else {
 377                         iip->ili_fields &= ~XFS_ILOG_AEXT;
 378                 }
 379                 break;
 380
 381         case XFS_DINODE_FMT_BTREE:
 382                 iip->ili_fields &=
 383                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 384
 385                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 386                     ip->i_afp->if_broot_bytes > 0) {
 387                         ASSERT(ip->i_afp->if_broot != NULL);
 388
 389                         vecp->i_addr = ip->i_afp->if_broot;
 390                         vecp->i_len = ip->i_afp->if_broot_bytes;
 391                         vecp->i_type = XLOG_REG_TYPE_IATTR_BROOT;
 392                         vecp++;
 393                         nvecs++;
 394                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 395                 } else {
 396                         iip->ili_fields &= ~XFS_ILOG_ABROOT;
 397                 }
 398                 break;
 399
 400         case XFS_DINODE_FMT_LOCAL:
 401                 iip->ili_fields &=
 402                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 403
 404                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 405                     ip->i_afp->if_bytes > 0) {
 406                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 407
 408                         vecp->i_addr = ip->i_afp->if_u1.if_data;
 409                         /*
 410                          * Round i_bytes up to a word boundary.
 411                          * The underlying memory is guaranteed to
 412                          * to be there by xfs_idata_realloc().
 413                          */
 414                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 415                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
 416                                (ip->i_afp->if_real_bytes == data_bytes));
 417                         vecp->i_len = (int)data_bytes;
 418                         vecp->i_type = XLOG_REG_TYPE_IATTR_LOCAL;
 419                         vecp++;
 420                         nvecs++;
 421                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
 422                 } else {
 423                         iip->ili_fields &= ~XFS_ILOG_ADATA;
 424                 }
 425                 break;
 426
 427         default:
 428                 ASSERT(0);
 429                 break;
 430         }
 431
 432 out:
 433         /*
 434          * Now update the log format that goes out to disk from the in-core
 435          * values.  We always write the inode core to make the arithmetic
 436          * games in recovery easier, which isn't a big deal as just about any
 437          * transaction would dirty it anyway.
 438          */
 439         iip->ili_format.ilf_fields = XFS_ILOG_CORE |
 440                 (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
 441         iip->ili_format.ilf_size = nvecs;
 442 }
 443
 444
 445 /*
 446  * This is called to pin the inode associated with the inode log
 447  * item in memory so it cannot be written out.
 448  */
 449 STATIC void
 450 xfs_inode_item_pin(
 451         struct xfs_log_item     *lip)
 452 {
 453         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 454
 455         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 456
 457         trace_xfs_inode_pin(ip, _RET_IP_);
 458         atomic_inc(&ip->i_pincount);
 459 }
 460
 461
 462 /*
 463  * This is called to unpin the inode associated with the inode log
 464  * item which was previously pinned with a call to xfs_inode_item_pin().
 465  *
 466  * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 467  */
 468 STATIC void
 469 xfs_inode_item_unpin(
 470         struct xfs_log_item     *lip,
 471         int                     remove)
 472 {
 473         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 474
 475         trace_xfs_inode_unpin(ip, _RET_IP_);
 476         ASSERT(atomic_read(&ip->i_pincount) > 0);
 477         if (atomic_dec_and_test(&ip->i_pincount))
 478                 wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
 479 }
 480
 481 STATIC uint
 482 xfs_inode_item_push(
 483         struct xfs_log_item     *lip,
 484         struct list_head        *buffer_list)
 485 {
 486         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 487         struct xfs_inode        *ip = iip->ili_inode;
 488         struct xfs_buf          *bp = NULL;
 489         uint                    rval = XFS_ITEM_SUCCESS;
 490         int                     error;
 491
 492         if (xfs_ipincount(ip) > 0)
 493                 return XFS_ITEM_PINNED;
 494
 495         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
 496                 return XFS_ITEM_LOCKED;
 497
 498         /*
 499          * Re-check the pincount now that we stabilized the value by
 500          * taking the ilock.
 501          */
 502         if (xfs_ipincount(ip) > 0) {
 503                 rval = XFS_ITEM_PINNED;
 504                 goto out_unlock;
 505         }
 506
 507         /*
 508          * Stale inode items should force out the iclog.
 509          */
 510         if (ip->i_flags & XFS_ISTALE) {
 511                 rval = XFS_ITEM_PINNED;
 512                 goto out_unlock;
 513         }
 514
 515         /*
 516          * Someone else is already flushing the inode.  Nothing we can do
 517          * here but wait for the flush to finish and remove the item from
 518          * the AIL.
 519          */
 520         if (!xfs_iflock_nowait(ip)) {
 521                 rval = XFS_ITEM_FLUSHING;
 522                 goto out_unlock;
 523         }
 524
 525         ASSERT(iip->ili_fields != 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 526         ASSERT(iip->ili_logged == 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 527
 528         spin_unlock(&lip->li_ailp->xa_lock);
 529
 530         error = xfs_iflush(ip, &bp);
 531         if (!error) {
 532                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 533                         rval = XFS_ITEM_FLUSHING;
 534                 xfs_buf_relse(bp);
 535         }
 536
 537         spin_lock(&lip->li_ailp->xa_lock);
 538 out_unlock:
 539         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 540         return rval;
 541 }
 542
 543 /*
 544  * Unlock the inode associated with the inode log item.
 545  * Clear the fields of the inode and inode log item that
 546  * are specific to the current transaction.  If the
 547  * hold flags is set, do not unlock the inode.
 548  */
 549 STATIC void
 550 xfs_inode_item_unlock(
 551         struct xfs_log_item     *lip)
 552 {
 553         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 554         struct xfs_inode        *ip = iip->ili_inode;
 555         unsigned short          lock_flags;
 556
 557         ASSERT(ip->i_itemp != NULL);
 558         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 559
 560         /*
 561          * If the inode needed a separate buffer with which to log
 562          * its extents, then free it now.
 563          */
 564         if (iip->ili_extents_buf != NULL) {
 565                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 566                 ASSERT(ip->i_d.di_nextents > 0);
 567                 ASSERT(iip->ili_fields & XFS_ILOG_DEXT);
 568                 ASSERT(ip->i_df.if_bytes > 0);
 569                 kmem_free(iip->ili_extents_buf);
 570                 iip->ili_extents_buf = NULL;
 571         }
 572         if (iip->ili_aextents_buf != NULL) {
 573                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 574                 ASSERT(ip->i_d.di_anextents > 0);
 575                 ASSERT(iip->ili_fields & XFS_ILOG_AEXT);
 576                 ASSERT(ip->i_afp->if_bytes > 0);
 577                 kmem_free(iip->ili_aextents_buf);
 578                 iip->ili_aextents_buf = NULL;
 579         }
 580
 581         lock_flags = iip->ili_lock_flags;
 582         iip->ili_lock_flags = 0;
 583         if (lock_flags)
 584                 xfs_iunlock(ip, lock_flags);
 585 }
 586
 587 /*
 588  * This is called to find out where the oldest active copy of the inode log
 589  * item in the on disk log resides now that the last log write of it completed
 590  * at the given lsn.  Since we always re-log all dirty data in an inode, the
 591  * latest copy in the on disk log is the only one that matters.  Therefore,
 592  * simply return the given lsn.
 593  *
 594  * If the inode has been marked stale because the cluster is being freed, we
 595  * don't want to (re-)insert this inode into the AIL. There is a race condition
 596  * where the cluster buffer may be unpinned before the inode is inserted into
 597  * the AIL during transaction committed processing. If the buffer is unpinned
 598  * before the inode item has been committed and inserted, then it is possible
 599  * for the buffer to be written and IO completes before the inode is inserted
 600  * into the AIL. In that case, we'd be inserting a clean, stale inode into the
 601  * AIL which will never get removed. It will, however, get reclaimed which
 602  * triggers an assert in xfs_inode_free() complaining about freein an inode
 603  * still in the AIL.
 604  *
 605  * To avoid this, just unpin the inode directly and return a LSN of -1 so the
 606  * transaction committed code knows that it does not need to do any further
 607  * processing on the item.
 608  */
 609 STATIC xfs_lsn_t
 610 xfs_inode_item_committed(
 611         struct xfs_log_item     *lip,
 612         xfs_lsn_t               lsn)
 613 {
 614         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 615         struct xfs_inode        *ip = iip->ili_inode;
 616
 617         if (xfs_iflags_test(ip, XFS_ISTALE)) {
 618                 xfs_inode_item_unpin(lip, 0);
 619                 return -1;
 620         }
 621         return lsn;
 622 }
 623
 624 /*
 625  * XXX rcc - this one really has to do something.  Probably needs
 626  * to stamp in a new field in the incore inode.
 627  */
 628 STATIC void
 629 xfs_inode_item_committing(
 630         struct xfs_log_item     *lip,
 631         xfs_lsn_t               lsn)
 632 {
 633         INODE_ITEM(lip)->ili_last_lsn = lsn;
 634 }
 635
 636 /*
 637  * This is the ops vector shared by all buf log items.
 638  */
 639 static const struct xfs_item_ops xfs_inode_item_ops = {
 640         .iop_size       = xfs_inode_item_size,
 641         .iop_format     = xfs_inode_item_format,
 642         .iop_pin        = xfs_inode_item_pin,
 643         .iop_unpin      = xfs_inode_item_unpin,
 644         .iop_unlock     = xfs_inode_item_unlock,
 645         .iop_committed  = xfs_inode_item_committed,
 646         .iop_push       = xfs_inode_item_push,
 647         .iop_committing = xfs_inode_item_committing
 648 };
 649
 650
 651 /*
 652  * Initialize the inode log item for a newly allocated (in-core) inode.
 653  */
 654 void
 655 xfs_inode_item_init(
 656         struct xfs_inode        *ip,
 657         struct xfs_mount        *mp)
 658 {
 659         struct xfs_inode_log_item *iip;
 660
 661         ASSERT(ip->i_itemp == NULL);
 662         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 663
 664         iip->ili_inode = ip;
 665         xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
 666                                                 &xfs_inode_item_ops);
 667         iip->ili_format.ilf_type = XFS_LI_INODE;
 668         iip->ili_format.ilf_ino = ip->i_ino;
 669         iip->ili_format.ilf_blkno = ip->i_imap.im_blkno;
 670         iip->ili_format.ilf_len = ip->i_imap.im_len;
 671         iip->ili_format.ilf_boffset = ip->i_imap.im_boffset;
 672 }
 673
 674 /*
 675  * Free the inode log item and any memory hanging off of it.
 676  */
 677 void
 678 xfs_inode_item_destroy(
 679         xfs_inode_t     *ip)
 680 {
 681 #ifdef XFS_TRANS_DEBUG
 682         if (ip->i_itemp->ili_root_size != 0) {
 683                 kmem_free(ip->i_itemp->ili_orig_root);
 684         }
 685 #endif
 686         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 687 }
 688
 689
 690 /*
 691  * This is the inode flushing I/O completion routine.  It is called
 692  * from interrupt level when the buffer containing the inode is
 693  * flushed to disk.  It is responsible for removing the inode item
 694  * from the AIL if it has not been re-logged, and unlocking the inode's
 695  * flush lock.
 696  *
 697  * To reduce AIL lock traffic as much as possible, we scan the buffer log item
 698  * list for other inodes that will run this function. We remove them from the
 699  * buffer list so we can process all the inode IO completions in one AIL lock
 700  * traversal.
 701  */
 702 void
 703 xfs_iflush_done(
 704         struct xfs_buf          *bp,
 705         struct xfs_log_item     *lip)
 706 {
 707         struct xfs_inode_log_item *iip;
 708         struct xfs_log_item     *blip;
 709         struct xfs_log_item     *next;
 710         struct xfs_log_item     *prev;
 711         struct xfs_ail          *ailp = lip->li_ailp;
 712         int                     need_ail = 0;
 713
 714         /*
 715          * Scan the buffer IO completions for other inodes being completed and
 716          * attach them to the current inode log item.
 717          */
 718         blip = bp->b_fspriv;
 719         prev = NULL;
 720         while (blip != NULL) {
 721                 if (lip->li_cb != xfs_iflush_done) {
 722                         prev = blip;
 723                         blip = blip->li_bio_list;
 724                         continue;
 725                 }
 726
 727                 /* remove from list */
 728                 next = blip->li_bio_list;
 729                 if (!prev) {
 730                         bp->b_fspriv = next;
 731                 } else {
 732                         prev->li_bio_list = next;
 733                 }
 734
 735                 /* add to current list */
 736                 blip->li_bio_list = lip->li_bio_list;
 737                 lip->li_bio_list = blip;
 738
 739                 /*
 740                  * while we have the item, do the unlocked check for needing
 741                  * the AIL lock.
 742                  */
 743                 iip = INODE_ITEM(blip);
 744                 if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
 745                         need_ail++;
 746
 747                 blip = next;
 748         }
 749
 750         /* make sure we capture the state of the initial inode. */
 751         iip = INODE_ITEM(lip);
 752         if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
 753                 need_ail++;
 754
 755         /*
 756          * We only want to pull the item from the AIL if it is
 757          * actually there and its location in the log has not
 758          * changed since we started the flush.  Thus, we only bother
 759          * if the ili_logged flag is set and the inode's lsn has not
 760          * changed.  First we check the lsn outside
 761          * the lock since it's cheaper, and then we recheck while
 762          * holding the lock before removing the inode from the AIL.
 763          */
 764         if (need_ail) {
 765                 struct xfs_log_item *log_items[need_ail];
 766                 int i = 0;
 767                 spin_lock(&ailp->xa_lock);
 768                 for (blip = lip; blip; blip = blip->li_bio_list) {
 769                         iip = INODE_ITEM(blip);
 770                         if (iip->ili_logged &&
 771                             blip->li_lsn == iip->ili_flush_lsn) {
 772                                 log_items[i++] = blip;
 773                         }
 774                         ASSERT(i <= need_ail);
 775                 }
 776                 /* xfs_trans_ail_delete_bulk() drops the AIL lock. */
 777                 xfs_trans_ail_delete_bulk(ailp, log_items, i,
 778                                           SHUTDOWN_CORRUPT_INCORE);
 779         }
 780
 781
 782         /*
 783          * clean up and unlock the flush lock now we are done. We can clear the
 784          * ili_last_fields bits now that we know that the data corresponding to
 785          * them is safely on disk.
 786          */
 787         for (blip = lip; blip; blip = next) {
 788                 next = blip->li_bio_list;
 789                 blip->li_bio_list = NULL;
 790
 791                 iip = INODE_ITEM(blip);
 792                 iip->ili_logged = 0;
 793                 iip->ili_last_fields = 0;
 794                 xfs_ifunlock(iip->ili_inode);
 795         }
 796 }
 797
 798 /*
 799  * This is the inode flushing abort routine.  It is called from xfs_iflush when
 800  * the filesystem is shutting down to clean up the inode state.  It is
 801  * responsible for removing the inode item from the AIL if it has not been
 802  * re-logged, and unlocking the inode's flush lock.
 803  */
 804 void
 805 xfs_iflush_abort(
 806         xfs_inode_t             *ip,
 807         bool                    stale)
 808 {
 809         xfs_inode_log_item_t    *iip = ip->i_itemp;
 810
 811         if (iip) {
 812                 struct xfs_ail  *ailp = iip->ili_item.li_ailp;
 813                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 814                         spin_lock(&ailp->xa_lock);
 815                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 816                                 /* xfs_trans_ail_delete() drops the AIL lock. */
 817                                 xfs_trans_ail_delete(ailp, &iip->ili_item,
 818                                                 stale ?
 819                                                      SHUTDOWN_LOG_IO_ERROR :
 820                                                      SHUTDOWN_CORRUPT_INCORE);
 821                         } else
 822                                 spin_unlock(&ailp->xa_lock);
 823                 }
 824                 iip->ili_logged = 0;
 825                 /*
 826                  * Clear the ili_last_fields bits now that we know that the
 827                  * data corresponding to them is safely on disk.
 828                  */
 829                 iip->ili_last_fields = 0;
 830                 /*
 831                  * Clear the inode logging fields so no more flushes are
 832                  * attempted.
 833                  */
 834                 iip->ili_fields = 0;
 835         }
 836         /*
 837          * Release the inode's flush lock since we're done with it.
 838          */
 839         xfs_ifunlock(ip);
 840 }
 841
 842 void
 843 xfs_istale_done(
 844         struct xfs_buf          *bp,
 845         struct xfs_log_item     *lip)
 846 {
 847         xfs_iflush_abort(INODE_ITEM(lip)->ili_inode, true);
 848 }
 849
 850 /*
 851  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
 852  * (which can have different field alignments) to the native version
 853  */
 854 int
 855 xfs_inode_item_format_convert(
 856         xfs_log_iovec_t         *buf,
 857         xfs_inode_log_format_t  *in_f)
 858 {
 859         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
 860                 xfs_inode_log_format_32_t *in_f32 = buf->i_addr;
 861
 862                 in_f->ilf_type = in_f32->ilf_type;
 863                 in_f->ilf_size = in_f32->ilf_size;
 864                 in_f->ilf_fields = in_f32->ilf_fields;
 865                 in_f->ilf_asize = in_f32->ilf_asize;
 866                 in_f->ilf_dsize = in_f32->ilf_dsize;
 867                 in_f->ilf_ino = in_f32->ilf_ino;
 868                 /* copy biggest field of ilf_u */
 869                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 870                        in_f32->ilf_u.ilfu_uuid.__u_bits,
 871                        sizeof(uuid_t));
 872                 in_f->ilf_blkno = in_f32->ilf_blkno;
 873                 in_f->ilf_len = in_f32->ilf_len;
 874                 in_f->ilf_boffset = in_f32->ilf_boffset;
 875                 return 0;
 876         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
 877                 xfs_inode_log_format_64_t *in_f64 = buf->i_addr;
 878
 879                 in_f->ilf_type = in_f64->ilf_type;
 880                 in_f->ilf_size = in_f64->ilf_size;
 881                 in_f->ilf_fields = in_f64->ilf_fields;
 882                 in_f->ilf_asize = in_f64->ilf_asize;
 883                 in_f->ilf_dsize = in_f64->ilf_dsize;
 884                 in_f->ilf_ino = in_f64->ilf_ino;
 885                 /* copy biggest field of ilf_u */
 886                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 887                        in_f64->ilf_u.ilfu_uuid.__u_bits,
 888                        sizeof(uuid_t));
 889                 in_f->ilf_blkno = in_f64->ilf_blkno;
 890                 in_f->ilf_len = in_f64->ilf_len;
 891                 in_f->ilf_boffset = in_f64->ilf_boffset;
 892                 return 0;
 893         }
 894         return EFSCORRUPTED;
 895 }