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_mount.h"
  24 #include "xfs_inode.h"
  25 #include "xfs_trans.h"
  26 #include "xfs_inode_item.h"
  27 #include "xfs_error.h"
  28 #include "xfs_trace.h"
  29 #include "xfs_trans_priv.h"
  30 #include "xfs_log.h"
  31
  32
  33 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  34
  35 static inline struct xfs_inode_log_item *INODE_ITEM(struct xfs_log_item *lip)
  36 {
  37         return container_of(lip, struct xfs_inode_log_item, ili_item);
  38 }
  39
  40 STATIC void
  41 xfs_inode_item_data_fork_size(
  42         struct xfs_inode_log_item *iip,
  43         int                     *nvecs,
  44         int                     *nbytes)
  45 {
  46         struct xfs_inode        *ip = iip->ili_inode;
  47
  48         switch (ip->i_d.di_format) {
  49         case XFS_DINODE_FMT_EXTENTS:
  50                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
  51                     ip->i_d.di_nextents > 0 &&
  52                     ip->i_df.if_bytes > 0) {
  53                         /* worst case, doesn't subtract delalloc extents */
  54                         *nbytes += XFS_IFORK_DSIZE(ip);
  55                         *nvecs += 1;
  56                 }
  57                 break;
  58         case XFS_DINODE_FMT_BTREE:
  59                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
  60                     ip->i_df.if_broot_bytes > 0) {
  61                         *nbytes += ip->i_df.if_broot_bytes;
  62                         *nvecs += 1;
  63                 }
  64                 break;
  65         case XFS_DINODE_FMT_LOCAL:
  66                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
  67                     ip->i_df.if_bytes > 0) {
  68                         *nbytes += roundup(ip->i_df.if_bytes, 4);
  69                         *nvecs += 1;
  70                 }
  71                 break;
  72
  73         case XFS_DINODE_FMT_DEV:
  74         case XFS_DINODE_FMT_UUID:
  75                 break;
  76         default:
  77                 ASSERT(0);
  78                 break;
  79         }
  80 }
  81
  82 STATIC void
  83 xfs_inode_item_attr_fork_size(
  84         struct xfs_inode_log_item *iip,
  85         int                     *nvecs,
  86         int                     *nbytes)
  87 {
  88         struct xfs_inode        *ip = iip->ili_inode;
  89
  90         switch (ip->i_d.di_aformat) {
  91         case XFS_DINODE_FMT_EXTENTS:
  92                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
  93                     ip->i_d.di_anextents > 0 &&
  94                     ip->i_afp->if_bytes > 0) {
  95                         /* worst case, doesn't subtract unused space */
  96                         *nbytes += XFS_IFORK_ASIZE(ip);
  97                         *nvecs += 1;
  98                 }
  99                 break;
 100         case XFS_DINODE_FMT_BTREE:
 101                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 102                     ip->i_afp->if_broot_bytes > 0) {
 103                         *nbytes += ip->i_afp->if_broot_bytes;
 104                         *nvecs += 1;
 105                 }
 106                 break;
 107         case XFS_DINODE_FMT_LOCAL:
 108                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 109                     ip->i_afp->if_bytes > 0) {
 110                         *nbytes += roundup(ip->i_afp->if_bytes, 4);
 111                         *nvecs += 1;
 112                 }
 113                 break;
 114         default:
 115                 ASSERT(0);
 116                 break;
 117         }
 118 }
 119
 120 /*
 121  * This returns the number of iovecs needed to log the given inode item.
 122  *
 123  * We need one iovec for the inode log format structure, one for the
 124  * inode core, and possibly one for the inode data/extents/b-tree root
 125  * and one for the inode attribute data/extents/b-tree root.
 126  */
 127 STATIC void
 128 xfs_inode_item_size(
 129         struct xfs_log_item     *lip,
 130         int                     *nvecs,
 131         int                     *nbytes)
 132 {
 133         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 134         struct xfs_inode        *ip = iip->ili_inode;
 135
 136         *nvecs += 2;
 137         *nbytes += sizeof(struct xfs_inode_log_format) +
 138                    xfs_log_dinode_size(ip->i_d.di_version);
 139
 140         xfs_inode_item_data_fork_size(iip, nvecs, nbytes);
 141         if (XFS_IFORK_Q(ip))
 142                 xfs_inode_item_attr_fork_size(iip, nvecs, nbytes);
 143 }
 144
 145 STATIC void
 146 xfs_inode_item_format_data_fork(
 147         struct xfs_inode_log_item *iip,
 148         struct xfs_inode_log_format *ilf,
 149         struct xfs_log_vec      *lv,
 150         struct xfs_log_iovec    **vecp)
 151 {
 152         struct xfs_inode        *ip = iip->ili_inode;
 153         size_t                  data_bytes;
 154
 155         switch (ip->i_d.di_format) {
 156         case XFS_DINODE_FMT_EXTENTS:
 157                 iip->ili_fields &=
 158                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 159                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 160
 161                 if ((iip->ili_fields & XFS_ILOG_DEXT) &&
 162                     ip->i_d.di_nextents > 0 &&
 163                     ip->i_df.if_bytes > 0) {
 164                         struct xfs_bmbt_rec *p;
 165
 166                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 167                         ASSERT(ip->i_df.if_bytes / sizeof(xfs_bmbt_rec_t) > 0);
 168
 169                         p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IEXT);
 170                         data_bytes = xfs_iextents_copy(ip, p, XFS_DATA_FORK);
 171                         xlog_finish_iovec(lv, *vecp, data_bytes);
 172
 173                         ASSERT(data_bytes <= ip->i_df.if_bytes);
 174
 175                         ilf->ilf_dsize = data_bytes;
 176                         ilf->ilf_size++;
 177                 } else {
 178                         iip->ili_fields &= ~XFS_ILOG_DEXT;
 179                 }
 180                 break;
 181         case XFS_DINODE_FMT_BTREE:
 182                 iip->ili_fields &=
 183                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 184                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 185
 186                 if ((iip->ili_fields & XFS_ILOG_DBROOT) &&
 187                     ip->i_df.if_broot_bytes > 0) {
 188                         ASSERT(ip->i_df.if_broot != NULL);
 189                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IBROOT,
 190                                         ip->i_df.if_broot,
 191                                         ip->i_df.if_broot_bytes);
 192                         ilf->ilf_dsize = ip->i_df.if_broot_bytes;
 193                         ilf->ilf_size++;
 194                 } else {
 195                         ASSERT(!(iip->ili_fields &
 196                                  XFS_ILOG_DBROOT));
 197                         iip->ili_fields &= ~XFS_ILOG_DBROOT;
 198                 }
 199                 break;
 200         case XFS_DINODE_FMT_LOCAL:
 201                 iip->ili_fields &=
 202                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 203                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 204                 if ((iip->ili_fields & XFS_ILOG_DDATA) &&
 205                     ip->i_df.if_bytes > 0) {
 206                         /*
 207                          * Round i_bytes up to a word boundary.
 208                          * The underlying memory is guaranteed to
 209                          * to be there by xfs_idata_realloc().
 210                          */
 211                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 212                         ASSERT(ip->i_df.if_real_bytes == 0 ||
 213                                ip->i_df.if_real_bytes >= data_bytes);
 214                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 215                         ASSERT(ip->i_d.di_size > 0);
 216                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_ILOCAL,
 217                                         ip->i_df.if_u1.if_data, data_bytes);
 218                         ilf->ilf_dsize = (unsigned)data_bytes;
 219                         ilf->ilf_size++;
 220                 } else {
 221                         iip->ili_fields &= ~XFS_ILOG_DDATA;
 222                 }
 223                 break;
 224         case XFS_DINODE_FMT_DEV:
 225                 iip->ili_fields &=
 226                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 227                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 228                 if (iip->ili_fields & XFS_ILOG_DEV)
 229                         ilf->ilf_u.ilfu_rdev = ip->i_df.if_u2.if_rdev;
 230                 break;
 231         case XFS_DINODE_FMT_UUID:
 232                 iip->ili_fields &=
 233                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 234                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 235                 if (iip->ili_fields & XFS_ILOG_UUID)
 236                         ilf->ilf_u.ilfu_uuid = ip->i_df.if_u2.if_uuid;
 237                 break;
 238         default:
 239                 ASSERT(0);
 240                 break;
 241         }
 242 }
 243
 244 STATIC void
 245 xfs_inode_item_format_attr_fork(
 246         struct xfs_inode_log_item *iip,
 247         struct xfs_inode_log_format *ilf,
 248         struct xfs_log_vec      *lv,
 249         struct xfs_log_iovec    **vecp)
 250 {
 251         struct xfs_inode        *ip = iip->ili_inode;
 252         size_t                  data_bytes;
 253
 254         switch (ip->i_d.di_aformat) {
 255         case XFS_DINODE_FMT_EXTENTS:
 256                 iip->ili_fields &=
 257                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 258
 259                 if ((iip->ili_fields & XFS_ILOG_AEXT) &&
 260                     ip->i_d.di_anextents > 0 &&
 261                     ip->i_afp->if_bytes > 0) {
 262                         struct xfs_bmbt_rec *p;
 263
 264                         ASSERT(ip->i_afp->if_bytes / sizeof(xfs_bmbt_rec_t) ==
 265                                 ip->i_d.di_anextents);
 266                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 267
 268                         p = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_EXT);
 269                         data_bytes = xfs_iextents_copy(ip, p, XFS_ATTR_FORK);
 270                         xlog_finish_iovec(lv, *vecp, data_bytes);
 271
 272                         ilf->ilf_asize = data_bytes;
 273                         ilf->ilf_size++;
 274                 } else {
 275                         iip->ili_fields &= ~XFS_ILOG_AEXT;
 276                 }
 277                 break;
 278         case XFS_DINODE_FMT_BTREE:
 279                 iip->ili_fields &=
 280                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 281
 282                 if ((iip->ili_fields & XFS_ILOG_ABROOT) &&
 283                     ip->i_afp->if_broot_bytes > 0) {
 284                         ASSERT(ip->i_afp->if_broot != NULL);
 285
 286                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_BROOT,
 287                                         ip->i_afp->if_broot,
 288                                         ip->i_afp->if_broot_bytes);
 289                         ilf->ilf_asize = ip->i_afp->if_broot_bytes;
 290                         ilf->ilf_size++;
 291                 } else {
 292                         iip->ili_fields &= ~XFS_ILOG_ABROOT;
 293                 }
 294                 break;
 295         case XFS_DINODE_FMT_LOCAL:
 296                 iip->ili_fields &=
 297                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 298
 299                 if ((iip->ili_fields & XFS_ILOG_ADATA) &&
 300                     ip->i_afp->if_bytes > 0) {
 301                         /*
 302                          * Round i_bytes up to a word boundary.
 303                          * The underlying memory is guaranteed to
 304                          * to be there by xfs_idata_realloc().
 305                          */
 306                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 307                         ASSERT(ip->i_afp->if_real_bytes == 0 ||
 308                                ip->i_afp->if_real_bytes >= data_bytes);
 309                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 310                         xlog_copy_iovec(lv, vecp, XLOG_REG_TYPE_IATTR_LOCAL,
 311                                         ip->i_afp->if_u1.if_data,
 312                                         data_bytes);
 313                         ilf->ilf_asize = (unsigned)data_bytes;
 314                         ilf->ilf_size++;
 315                 } else {
 316                         iip->ili_fields &= ~XFS_ILOG_ADATA;
 317                 }
 318                 break;
 319         default:
 320                 ASSERT(0);
 321                 break;
 322         }
 323 }
 324
 325 static void
 326 xfs_inode_to_log_dinode(
 327         struct xfs_inode        *ip,
 328         struct xfs_log_dinode   *to,
 329         xfs_lsn_t               lsn)
 330 {
 331         struct xfs_icdinode     *from = &ip->i_d;
 332         struct inode            *inode = VFS_I(ip);
 333
 334         to->di_magic = XFS_DINODE_MAGIC;
 335
 336         to->di_version = from->di_version;
 337         to->di_format = from->di_format;
 338         to->di_uid = from->di_uid;
 339         to->di_gid = from->di_gid;
 340         to->di_projid_lo = from->di_projid_lo;
 341         to->di_projid_hi = from->di_projid_hi;
 342
 343         memset(to->di_pad, 0, sizeof(to->di_pad));
 344         memset(to->di_pad3, 0, sizeof(to->di_pad3));
 345         to->di_atime.t_sec = inode->i_atime.tv_sec;
 346         to->di_atime.t_nsec = inode->i_atime.tv_nsec;
 347         to->di_mtime.t_sec = inode->i_mtime.tv_sec;
 348         to->di_mtime.t_nsec = inode->i_mtime.tv_nsec;
 349         to->di_ctime.t_sec = inode->i_ctime.tv_sec;
 350         to->di_ctime.t_nsec = inode->i_ctime.tv_nsec;
 351         to->di_nlink = inode->i_nlink;
 352         to->di_gen = inode->i_generation;
 353         to->di_mode = inode->i_mode;
 354
 355         to->di_size = from->di_size;
 356         to->di_nblocks = from->di_nblocks;
 357         to->di_extsize = from->di_extsize;
 358         to->di_nextents = from->di_nextents;
 359         to->di_anextents = from->di_anextents;
 360         to->di_forkoff = from->di_forkoff;
 361         to->di_aformat = from->di_aformat;
 362         to->di_dmevmask = from->di_dmevmask;
 363         to->di_dmstate = from->di_dmstate;
 364         to->di_flags = from->di_flags;
 365
 366         if (from->di_version == 3) {
 367                 to->di_changecount = inode->i_version;
 368                 to->di_crtime.t_sec = from->di_crtime.t_sec;
 369                 to->di_crtime.t_nsec = from->di_crtime.t_nsec;
 370                 to->di_flags2 = from->di_flags2;
 371
 372                 to->di_ino = ip->i_ino;
 373                 to->di_lsn = lsn;
 374                 memset(to->di_pad2, 0, sizeof(to->di_pad2));
 375                 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
 376                 to->di_flushiter = 0;
 377         } else {
 378                 to->di_flushiter = from->di_flushiter;
 379         }
 380 }
 381
 382 /*
 383  * Format the inode core. Current timestamp data is only in the VFS inode
 384  * fields, so we need to grab them from there. Hence rather than just copying
 385  * the XFS inode core structure, format the fields directly into the iovec.
 386  */
 387 static void
 388 xfs_inode_item_format_core(
 389         struct xfs_inode        *ip,
 390         struct xfs_log_vec      *lv,
 391         struct xfs_log_iovec    **vecp)
 392 {
 393         struct xfs_log_dinode   *dic;
 394
 395         dic = xlog_prepare_iovec(lv, vecp, XLOG_REG_TYPE_ICORE);
 396         xfs_inode_to_log_dinode(ip, dic, ip->i_itemp->ili_item.li_lsn);
 397         xlog_finish_iovec(lv, *vecp, xfs_log_dinode_size(ip->i_d.di_version));
 398 }
 399
 400 /*
 401  * This is called to fill in the vector of log iovecs for the given inode
 402  * log item.  It fills the first item with an inode log format structure,
 403  * the second with the on-disk inode structure, and a possible third and/or
 404  * fourth with the inode data/extents/b-tree root and inode attributes
 405  * data/extents/b-tree root.
 406  */
 407 STATIC void
 408 xfs_inode_item_format(
 409         struct xfs_log_item     *lip,
 410         struct xfs_log_vec      *lv)
 411 {
 412         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 413         struct xfs_inode        *ip = iip->ili_inode;
 414         struct xfs_inode_log_format *ilf;
 415         struct xfs_log_iovec    *vecp = NULL;
 416
 417         ASSERT(ip->i_d.di_version > 1);
 418
 419         ilf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_IFORMAT);
 420         ilf->ilf_type = XFS_LI_INODE;
 421         ilf->ilf_ino = ip->i_ino;
 422         ilf->ilf_blkno = ip->i_imap.im_blkno;
 423         ilf->ilf_len = ip->i_imap.im_len;
 424         ilf->ilf_boffset = ip->i_imap.im_boffset;
 425         ilf->ilf_fields = XFS_ILOG_CORE;
 426         ilf->ilf_size = 2; /* format + core */
 427         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_inode_log_format));
 428
 429         xfs_inode_item_format_core(ip, lv, &vecp);
 430         xfs_inode_item_format_data_fork(iip, ilf, lv, &vecp);
 431         if (XFS_IFORK_Q(ip)) {
 432                 xfs_inode_item_format_attr_fork(iip, ilf, lv, &vecp);
 433         } else {
 434                 iip->ili_fields &=
 435                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 436         }
 437
 438         /* update the format with the exact fields we actually logged */
 439         ilf->ilf_fields |= (iip->ili_fields & ~XFS_ILOG_TIMESTAMP);
 440 }
 441
 442 /*
 443  * This is called to pin the inode associated with the inode log
 444  * item in memory so it cannot be written out.
 445  */
 446 STATIC void
 447 xfs_inode_item_pin(
 448         struct xfs_log_item     *lip)
 449 {
 450         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 451
 452         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 453
 454         trace_xfs_inode_pin(ip, _RET_IP_);
 455         atomic_inc(&ip->i_pincount);
 456 }
 457
 458
 459 /*
 460  * This is called to unpin the inode associated with the inode log
 461  * item which was previously pinned with a call to xfs_inode_item_pin().
 462  *
 463  * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 464  */
 465 STATIC void
 466 xfs_inode_item_unpin(
 467         struct xfs_log_item     *lip,
 468         int                     remove)
 469 {
 470         struct xfs_inode        *ip = INODE_ITEM(lip)->ili_inode;
 471
 472         trace_xfs_inode_unpin(ip, _RET_IP_);
 473         ASSERT(atomic_read(&ip->i_pincount) > 0);
 474         if (atomic_dec_and_test(&ip->i_pincount))
 475                 wake_up_bit(&ip->i_flags, __XFS_IPINNED_BIT);
 476 }
 477
 478 STATIC uint
 479 xfs_inode_item_push(
 480         struct xfs_log_item     *lip,
 481         struct list_head        *buffer_list)
 482                 __releases(&lip->li_ailp->xa_lock)
 483                 __acquires(&lip->li_ailp->xa_lock)
 484 {
 485         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 486         struct xfs_inode        *ip = iip->ili_inode;
 487         struct xfs_buf          *bp = NULL;
 488         uint                    rval = XFS_ITEM_SUCCESS;
 489         int                     error;
 490
 491         if (xfs_ipincount(ip) > 0)
 492                 return XFS_ITEM_PINNED;
 493
 494         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED))
 495                 return XFS_ITEM_LOCKED;
 496
 497         /*
 498          * Re-check the pincount now that we stabilized the value by
 499          * taking the ilock.
 500          */
 501         if (xfs_ipincount(ip) > 0) {
 502                 rval = XFS_ITEM_PINNED;
 503                 goto out_unlock;
 504         }
 505
 506         /*
 507          * Stale inode items should force out the iclog.
 508          */
 509         if (ip->i_flags & XFS_ISTALE) {
 510                 rval = XFS_ITEM_PINNED;
 511                 goto out_unlock;
 512         }
 513
 514         /*
 515          * Someone else is already flushing the inode.  Nothing we can do
 516          * here but wait for the flush to finish and remove the item from
 517          * the AIL.
 518          */
 519         if (!xfs_iflock_nowait(ip)) {
 520                 rval = XFS_ITEM_FLUSHING;
 521                 goto out_unlock;
 522         }
 523
 524         ASSERT(iip->ili_fields != 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 525         ASSERT(iip->ili_logged == 0 || XFS_FORCED_SHUTDOWN(ip->i_mount));
 526
 527         spin_unlock(&lip->li_ailp->xa_lock);
 528
 529         error = xfs_iflush(ip, &bp);
 530         if (!error) {
 531                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 532                         rval = XFS_ITEM_FLUSHING;
 533                 xfs_buf_relse(bp);
 534         }
 535
 536         spin_lock(&lip->li_ailp->xa_lock);
 537 out_unlock:
 538         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 539         return rval;
 540 }
 541
 542 /*
 543  * Unlock the inode associated with the inode log item.
 544  * Clear the fields of the inode and inode log item that
 545  * are specific to the current transaction.  If the
 546  * hold flags is set, do not unlock the inode.
 547  */
 548 STATIC void
 549 xfs_inode_item_unlock(
 550         struct xfs_log_item     *lip)
 551 {
 552         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 553         struct xfs_inode        *ip = iip->ili_inode;
 554         unsigned short          lock_flags;
 555
 556         ASSERT(ip->i_itemp != NULL);
 557         ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
 558
 559         lock_flags = iip->ili_lock_flags;
 560         iip->ili_lock_flags = 0;
 561         if (lock_flags)
 562                 xfs_iunlock(ip, lock_flags);
 563 }
 564
 565 /*
 566  * This is called to find out where the oldest active copy of the inode log
 567  * item in the on disk log resides now that the last log write of it completed
 568  * at the given lsn.  Since we always re-log all dirty data in an inode, the
 569  * latest copy in the on disk log is the only one that matters.  Therefore,
 570  * simply return the given lsn.
 571  *
 572  * If the inode has been marked stale because the cluster is being freed, we
 573  * don't want to (re-)insert this inode into the AIL. There is a race condition
 574  * where the cluster buffer may be unpinned before the inode is inserted into
 575  * the AIL during transaction committed processing. If the buffer is unpinned
 576  * before the inode item has been committed and inserted, then it is possible
 577  * for the buffer to be written and IO completes before the inode is inserted
 578  * into the AIL. In that case, we'd be inserting a clean, stale inode into the
 579  * AIL which will never get removed. It will, however, get reclaimed which
 580  * triggers an assert in xfs_inode_free() complaining about freein an inode
 581  * still in the AIL.
 582  *
 583  * To avoid this, just unpin the inode directly and return a LSN of -1 so the
 584  * transaction committed code knows that it does not need to do any further
 585  * processing on the item.
 586  */
 587 STATIC xfs_lsn_t
 588 xfs_inode_item_committed(
 589         struct xfs_log_item     *lip,
 590         xfs_lsn_t               lsn)
 591 {
 592         struct xfs_inode_log_item *iip = INODE_ITEM(lip);
 593         struct xfs_inode        *ip = iip->ili_inode;
 594
 595         if (xfs_iflags_test(ip, XFS_ISTALE)) {
 596                 xfs_inode_item_unpin(lip, 0);
 597                 return -1;
 598         }
 599         return lsn;
 600 }
 601
 602 /*
 603  * XXX rcc - this one really has to do something.  Probably needs
 604  * to stamp in a new field in the incore inode.
 605  */
 606 STATIC void
 607 xfs_inode_item_committing(
 608         struct xfs_log_item     *lip,
 609         xfs_lsn_t               lsn)
 610 {
 611         INODE_ITEM(lip)->ili_last_lsn = lsn;
 612 }
 613
 614 /*
 615  * This is the ops vector shared by all buf log items.
 616  */
 617 static const struct xfs_item_ops xfs_inode_item_ops = {
 618         .iop_size       = xfs_inode_item_size,
 619         .iop_format     = xfs_inode_item_format,
 620         .iop_pin        = xfs_inode_item_pin,
 621         .iop_unpin      = xfs_inode_item_unpin,
 622         .iop_unlock     = xfs_inode_item_unlock,
 623         .iop_committed  = xfs_inode_item_committed,
 624         .iop_push       = xfs_inode_item_push,
 625         .iop_committing = xfs_inode_item_committing
 626 };
 627
 628
 629 /*
 630  * Initialize the inode log item for a newly allocated (in-core) inode.
 631  */
 632 void
 633 xfs_inode_item_init(
 634         struct xfs_inode        *ip,
 635         struct xfs_mount        *mp)
 636 {
 637         struct xfs_inode_log_item *iip;
 638
 639         ASSERT(ip->i_itemp == NULL);
 640         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 641
 642         iip->ili_inode = ip;
 643         xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
 644                                                 &xfs_inode_item_ops);
 645 }
 646
 647 /*
 648  * Free the inode log item and any memory hanging off of it.
 649  */
 650 void
 651 xfs_inode_item_destroy(
 652         xfs_inode_t     *ip)
 653 {
 654         kmem_free(ip->i_itemp->ili_item.li_lv_shadow);
 655         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 656 }
 657
 658
 659 /*
 660  * This is the inode flushing I/O completion routine.  It is called
 661  * from interrupt level when the buffer containing the inode is
 662  * flushed to disk.  It is responsible for removing the inode item
 663  * from the AIL if it has not been re-logged, and unlocking the inode's
 664  * flush lock.
 665  *
 666  * To reduce AIL lock traffic as much as possible, we scan the buffer log item
 667  * list for other inodes that will run this function. We remove them from the
 668  * buffer list so we can process all the inode IO completions in one AIL lock
 669  * traversal.
 670  */
 671 void
 672 xfs_iflush_done(
 673         struct xfs_buf          *bp,
 674         struct xfs_log_item     *lip)
 675 {
 676         struct xfs_inode_log_item *iip;
 677         struct xfs_log_item     *blip;
 678         struct xfs_log_item     *next;
 679         struct xfs_log_item     *prev;
 680         struct xfs_ail          *ailp = lip->li_ailp;
 681         int                     need_ail = 0;
 682
 683         /*
 684          * Scan the buffer IO completions for other inodes being completed and
 685          * attach them to the current inode log item.
 686          */
 687         blip = bp->b_fspriv;
 688         prev = NULL;
 689         while (blip != NULL) {
 690                 if (blip->li_cb != xfs_iflush_done) {
 691                         prev = blip;
 692                         blip = blip->li_bio_list;
 693                         continue;
 694                 }
 695
 696                 /* remove from list */
 697                 next = blip->li_bio_list;
 698                 if (!prev) {
 699                         bp->b_fspriv = next;
 700                 } else {
 701                         prev->li_bio_list = next;
 702                 }
 703
 704                 /* add to current list */
 705                 blip->li_bio_list = lip->li_bio_list;
 706                 lip->li_bio_list = blip;
 707
 708                 /*
 709                  * while we have the item, do the unlocked check for needing
 710                  * the AIL lock.
 711                  */
 712                 iip = INODE_ITEM(blip);
 713                 if (iip->ili_logged && blip->li_lsn == iip->ili_flush_lsn)
 714                         need_ail++;
 715
 716                 blip = next;
 717         }
 718
 719         /* make sure we capture the state of the initial inode. */
 720         iip = INODE_ITEM(lip);
 721         if (iip->ili_logged && lip->li_lsn == iip->ili_flush_lsn)
 722                 need_ail++;
 723
 724         /*
 725          * We only want to pull the item from the AIL if it is
 726          * actually there and its location in the log has not
 727          * changed since we started the flush.  Thus, we only bother
 728          * if the ili_logged flag is set and the inode's lsn has not
 729          * changed.  First we check the lsn outside
 730          * the lock since it's cheaper, and then we recheck while
 731          * holding the lock before removing the inode from the AIL.
 732          */
 733         if (need_ail) {
 734                 struct xfs_log_item *log_items[need_ail];
 735                 int i = 0;
 736                 spin_lock(&ailp->xa_lock);
 737                 for (blip = lip; blip; blip = blip->li_bio_list) {
 738                         iip = INODE_ITEM(blip);
 739                         if (iip->ili_logged &&
 740                             blip->li_lsn == iip->ili_flush_lsn) {
 741                                 log_items[i++] = blip;
 742                         }
 743                         ASSERT(i <= need_ail);
 744                 }
 745                 /* xfs_trans_ail_delete_bulk() drops the AIL lock. */
 746                 xfs_trans_ail_delete_bulk(ailp, log_items, i,
 747                                           SHUTDOWN_CORRUPT_INCORE);
 748         }
 749
 750
 751         /*
 752          * clean up and unlock the flush lock now we are done. We can clear the
 753          * ili_last_fields bits now that we know that the data corresponding to
 754          * them is safely on disk.
 755          */
 756         for (blip = lip; blip; blip = next) {
 757                 next = blip->li_bio_list;
 758                 blip->li_bio_list = NULL;
 759
 760                 iip = INODE_ITEM(blip);
 761                 iip->ili_logged = 0;
 762                 iip->ili_last_fields = 0;
 763                 xfs_ifunlock(iip->ili_inode);
 764         }
 765 }
 766
 767 /*
 768  * This is the inode flushing abort routine.  It is called from xfs_iflush when
 769  * the filesystem is shutting down to clean up the inode state.  It is
 770  * responsible for removing the inode item from the AIL if it has not been
 771  * re-logged, and unlocking the inode's flush lock.
 772  */
 773 void
 774 xfs_iflush_abort(
 775         xfs_inode_t             *ip,
 776         bool                    stale)
 777 {
 778         xfs_inode_log_item_t    *iip = ip->i_itemp;
 779
 780         if (iip) {
 781                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 782                         xfs_trans_ail_remove(&iip->ili_item,
 783                                              stale ? SHUTDOWN_LOG_IO_ERROR :
 784                                                      SHUTDOWN_CORRUPT_INCORE);
 785                 }
 786                 iip->ili_logged = 0;
 787                 /*
 788                  * Clear the ili_last_fields bits now that we know that the
 789                  * data corresponding to them is safely on disk.
 790                  */
 791                 iip->ili_last_fields = 0;
 792                 /*
 793                  * Clear the inode logging fields so no more flushes are
 794                  * attempted.
 795                  */
 796                 iip->ili_fields = 0;
 797                 iip->ili_fsync_fields = 0;
 798         }
 799         /*
 800          * Release the inode's flush lock since we're done with it.
 801          */
 802         xfs_ifunlock(ip);
 803 }
 804
 805 void
 806 xfs_istale_done(
 807         struct xfs_buf          *bp,
 808         struct xfs_log_item     *lip)
 809 {
 810         xfs_iflush_abort(INODE_ITEM(lip)->ili_inode, true);
 811 }
 812
 813 /*
 814  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
 815  * (which can have different field alignments) to the native version
 816  */
 817 int
 818 xfs_inode_item_format_convert(
 819         xfs_log_iovec_t         *buf,
 820         xfs_inode_log_format_t  *in_f)
 821 {
 822         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
 823                 xfs_inode_log_format_32_t *in_f32 = buf->i_addr;
 824
 825                 in_f->ilf_type = in_f32->ilf_type;
 826                 in_f->ilf_size = in_f32->ilf_size;
 827                 in_f->ilf_fields = in_f32->ilf_fields;
 828                 in_f->ilf_asize = in_f32->ilf_asize;
 829                 in_f->ilf_dsize = in_f32->ilf_dsize;
 830                 in_f->ilf_ino = in_f32->ilf_ino;
 831                 /* copy biggest field of ilf_u */
 832                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 833                        in_f32->ilf_u.ilfu_uuid.__u_bits,
 834                        sizeof(uuid_t));
 835                 in_f->ilf_blkno = in_f32->ilf_blkno;
 836                 in_f->ilf_len = in_f32->ilf_len;
 837                 in_f->ilf_boffset = in_f32->ilf_boffset;
 838                 return 0;
 839         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
 840                 xfs_inode_log_format_64_t *in_f64 = buf->i_addr;
 841
 842                 in_f->ilf_type = in_f64->ilf_type;
 843                 in_f->ilf_size = in_f64->ilf_size;
 844                 in_f->ilf_fields = in_f64->ilf_fields;
 845                 in_f->ilf_asize = in_f64->ilf_asize;
 846                 in_f->ilf_dsize = in_f64->ilf_dsize;
 847                 in_f->ilf_ino = in_f64->ilf_ino;
 848                 /* copy biggest field of ilf_u */
 849                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
 850                        in_f64->ilf_u.ilfu_uuid.__u_bits,
 851                        sizeof(uuid_t));
 852                 in_f->ilf_blkno = in_f64->ilf_blkno;
 853                 in_f->ilf_len = in_f64->ilf_len;
 854                 in_f->ilf_boffset = in_f64->ilf_boffset;
 855                 return 0;
 856         }
 857         return -EFSCORRUPTED;
 858 }