SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_buf_item.h"
  26 #include "xfs_sb.h"
  27 #include "xfs_ag.h"
  28 #include "xfs_dir2.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_trans_priv.h"
  32 #include "xfs_bmap_btree.h"
  33 #include "xfs_alloc_btree.h"
  34 #include "xfs_ialloc_btree.h"
  35 #include "xfs_dir2_sf.h"
  36 #include "xfs_attr_sf.h"
  37 #include "xfs_dinode.h"
  38 #include "xfs_inode.h"
  39 #include "xfs_inode_item.h"
  40 #include "xfs_btree.h"
  41 #include "xfs_ialloc.h"
  42 #include "xfs_rw.h"
  43 #include "xfs_error.h"
  44 #include "xfs_trace.h"
  45
  46
  47 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  48
  49 /*
  50  * This returns the number of iovecs needed to log the given inode item.
  51  *
  52  * We need one iovec for the inode log format structure, one for the
  53  * inode core, and possibly one for the inode data/extents/b-tree root
  54  * and one for the inode attribute data/extents/b-tree root.
  55  */
  56 STATIC uint
  57 xfs_inode_item_size(
  58         xfs_inode_log_item_t    *iip)
  59 {
  60         uint            nvecs;
  61         xfs_inode_t     *ip;
  62
  63         ip = iip->ili_inode;
  64         nvecs = 2;
  65
  66         /*
  67          * Only log the data/extents/b-tree root if there is something
  68          * left to log.
  69          */
  70         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  71
  72         switch (ip->i_d.di_format) {
  73         case XFS_DINODE_FMT_EXTENTS:
  74                 iip->ili_format.ilf_fields &=
  75                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  76                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  77                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
  78                     (ip->i_d.di_nextents > 0) &&
  79                     (ip->i_df.if_bytes > 0)) {
  80                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
  81                         nvecs++;
  82                 } else {
  83                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
  84                 }
  85                 break;
  86
  87         case XFS_DINODE_FMT_BTREE:
  88                 ASSERT(ip->i_df.if_ext_max ==
  89                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
  90                 iip->ili_format.ilf_fields &=
  91                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
  92                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  93                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
  94                     (ip->i_df.if_broot_bytes > 0)) {
  95                         ASSERT(ip->i_df.if_broot != NULL);
  96                         nvecs++;
  97                 } else {
  98                         ASSERT(!(iip->ili_format.ilf_fields &
  99                                  XFS_ILOG_DBROOT));
 100 #ifdef XFS_TRANS_DEBUG
 101                         if (iip->ili_root_size > 0) {
 102                                 ASSERT(iip->ili_root_size ==
 103                                        ip->i_df.if_broot_bytes);
 104                                 ASSERT(memcmp(iip->ili_orig_root,
 105                                             ip->i_df.if_broot,
 106                                             iip->ili_root_size) == 0);
 107                         } else {
 108                                 ASSERT(ip->i_df.if_broot_bytes == 0);
 109                         }
 110 #endif
 111                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
 112                 }
 113                 break;
 114
 115         case XFS_DINODE_FMT_LOCAL:
 116                 iip->ili_format.ilf_fields &=
 117                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 118                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 119                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
 120                     (ip->i_df.if_bytes > 0)) {
 121                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 122                         ASSERT(ip->i_d.di_size > 0);
 123                         nvecs++;
 124                 } else {
 125                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
 126                 }
 127                 break;
 128
 129         case XFS_DINODE_FMT_DEV:
 130                 iip->ili_format.ilf_fields &=
 131                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 132                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 133                 break;
 134
 135         case XFS_DINODE_FMT_UUID:
 136                 iip->ili_format.ilf_fields &=
 137                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 138                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 139                 break;
 140
 141         default:
 142                 ASSERT(0);
 143                 break;
 144         }
 145
 146         /*
 147          * If there are no attributes associated with this file,
 148          * then there cannot be anything more to log.
 149          * Clear all attribute-related log flags.
 150          */
 151         if (!XFS_IFORK_Q(ip)) {
 152                 iip->ili_format.ilf_fields &=
 153                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 154                 return nvecs;
 155         }
 156
 157         /*
 158          * Log any necessary attribute data.
 159          */
 160         switch (ip->i_d.di_aformat) {
 161         case XFS_DINODE_FMT_EXTENTS:
 162                 iip->ili_format.ilf_fields &=
 163                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 164                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
 165                     (ip->i_d.di_anextents > 0) &&
 166                     (ip->i_afp->if_bytes > 0)) {
 167                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 168                         nvecs++;
 169                 } else {
 170                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
 171                 }
 172                 break;
 173
 174         case XFS_DINODE_FMT_BTREE:
 175                 iip->ili_format.ilf_fields &=
 176                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 177                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
 178                     (ip->i_afp->if_broot_bytes > 0)) {
 179                         ASSERT(ip->i_afp->if_broot != NULL);
 180                         nvecs++;
 181                 } else {
 182                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
 183                 }
 184                 break;
 185
 186         case XFS_DINODE_FMT_LOCAL:
 187                 iip->ili_format.ilf_fields &=
 188                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 189                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
 190                     (ip->i_afp->if_bytes > 0)) {
 191                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 192                         nvecs++;
 193                 } else {
 194                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
 195                 }
 196                 break;
 197
 198         default:
 199                 ASSERT(0);
 200                 break;
 201         }
 202
 203         return nvecs;
 204 }
 205
 206 /*
 207  * This is called to fill in the vector of log iovecs for the
 208  * given inode log item.  It fills the first item with an inode
 209  * log format structure, the second with the on-disk inode structure,
 210  * and a possible third and/or fourth with the inode data/extents/b-tree
 211  * root and inode attributes data/extents/b-tree root.
 212  */
 213 STATIC void
 214 xfs_inode_item_format(
 215         xfs_inode_log_item_t    *iip,
 216         xfs_log_iovec_t         *log_vector)
 217 {
 218         uint                    nvecs;
 219         xfs_log_iovec_t         *vecp;
 220         xfs_inode_t             *ip;
 221         size_t                  data_bytes;
 222         xfs_bmbt_rec_t          *ext_buffer;
 223         int                     nrecs;
 224         xfs_mount_t             *mp;
 225
 226         ip = iip->ili_inode;
 227         vecp = log_vector;
 228
 229         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
 230         vecp->i_len  = sizeof(xfs_inode_log_format_t);
 231         vecp->i_type = XLOG_REG_TYPE_IFORMAT;
 232         vecp++;
 233         nvecs        = 1;
 234
 235         /*
 236          * Make sure the linux inode is dirty. We do this before
 237          * clearing i_update_core as the VFS will call back into
 238          * XFS here and set i_update_core, so we need to dirty the
 239          * inode first so that the ordering of i_update_core and
 240          * unlogged modifications still works as described below.
 241          */
 242         xfs_mark_inode_dirty_sync(ip);
 243
 244         /*
 245          * Clear i_update_core if the timestamps (or any other
 246          * non-transactional modification) need flushing/logging
 247          * and we're about to log them with the rest of the core.
 248          *
 249          * This is the same logic as xfs_iflush() but this code can't
 250          * run at the same time as xfs_iflush because we're in commit
 251          * processing here and so we have the inode lock held in
 252          * exclusive mode.  Although it doesn't really matter
 253          * for the timestamps if both routines were to grab the
 254          * timestamps or not.  That would be ok.
 255          *
 256          * We clear i_update_core before copying out the data.
 257          * This is for coordination with our timestamp updates
 258          * that don't hold the inode lock. They will always
 259          * update the timestamps BEFORE setting i_update_core,
 260          * so if we clear i_update_core after they set it we
 261          * are guaranteed to see their updates to the timestamps
 262          * either here.  Likewise, if they set it after we clear it
 263          * here, we'll see it either on the next commit of this
 264          * inode or the next time the inode gets flushed via
 265          * xfs_iflush().  This depends on strongly ordered memory
 266          * semantics, but we have that.  We use the SYNCHRONIZE
 267          * macro to make sure that the compiler does not reorder
 268          * the i_update_core access below the data copy below.
 269          */
 270         if (ip->i_update_core)  {
 271                 ip->i_update_core = 0;
 272                 SYNCHRONIZE();
 273         }
 274
 275         /*
 276          * Make sure to get the latest timestamps from the Linux inode.
 277          */
 278         xfs_synchronize_times(ip);
 279
 280         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
 281         vecp->i_len  = sizeof(struct xfs_icdinode);
 282         vecp->i_type = XLOG_REG_TYPE_ICORE;
 283         vecp++;
 284         nvecs++;
 285         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
 286
 287         /*
 288          * If this is really an old format inode, then we need to
 289          * log it as such.  This means that we have to copy the link
 290          * count from the new field to the old.  We don't have to worry
 291          * about the new fields, because nothing trusts them as long as
 292          * the old inode version number is there.  If the superblock already
 293          * has a new version number, then we don't bother converting back.
 294          */
 295         mp = ip->i_mount;
 296         ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
 297         if (ip->i_d.di_version == 1) {
 298                 if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
 299                         /*
 300                          * Convert it back.
 301                          */
 302                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
 303                         ip->i_d.di_onlink = ip->i_d.di_nlink;
 304                 } else {
 305                         /*
 306                          * The superblock version has already been bumped,
 307                          * so just make the conversion to the new inode
 308                          * format permanent.
 309                          */
 310                         ip->i_d.di_version = 2;
 311                         ip->i_d.di_onlink = 0;
 312                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
 313                 }
 314         }
 315
 316         switch (ip->i_d.di_format) {
 317         case XFS_DINODE_FMT_EXTENTS:
 318                 ASSERT(!(iip->ili_format.ilf_fields &
 319                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 320                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 321                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
 322                         ASSERT(ip->i_df.if_bytes > 0);
 323                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 324                         ASSERT(ip->i_d.di_nextents > 0);
 325                         ASSERT(iip->ili_extents_buf == NULL);
 326                         nrecs = ip->i_df.if_bytes /
 327                                 (uint)sizeof(xfs_bmbt_rec_t);
 328                         ASSERT(nrecs > 0);
 329 #ifdef XFS_NATIVE_HOST
 330                         if (nrecs == ip->i_d.di_nextents) {
 331                                 /*
 332                                  * There are no delayed allocation
 333                                  * extents, so just point to the
 334                                  * real extents array.
 335                                  */
 336                                 vecp->i_addr =
 337                                         (char *)(ip->i_df.if_u1.if_extents);
 338                                 vecp->i_len = ip->i_df.if_bytes;
 339                                 vecp->i_type = XLOG_REG_TYPE_IEXT;
 340                         } else
 341 #endif
 342                         {
 343                                 /*
 344                                  * There are delayed allocation extents
 345                                  * in the inode, or we need to convert
 346                                  * the extents to on disk format.
 347                                  * Use xfs_iextents_copy()
 348                                  * to copy only the real extents into
 349                                  * a separate buffer.  We'll free the
 350                                  * buffer in the unlock routine.
 351                                  */
 352                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
 353                                         KM_SLEEP);
 354                                 iip->ili_extents_buf = ext_buffer;
 355                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
 356                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 357                                                 XFS_DATA_FORK);
 358                                 vecp->i_type = XLOG_REG_TYPE_IEXT;
 359                         }
 360                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
 361                         iip->ili_format.ilf_dsize = vecp->i_len;
 362                         vecp++;
 363                         nvecs++;
 364                 }
 365                 break;
 366
 367         case XFS_DINODE_FMT_BTREE:
 368                 ASSERT(!(iip->ili_format.ilf_fields &
 369                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 370                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 371                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
 372                         ASSERT(ip->i_df.if_broot_bytes > 0);
 373                         ASSERT(ip->i_df.if_broot != NULL);
 374                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
 375                         vecp->i_len = ip->i_df.if_broot_bytes;
 376                         vecp->i_type = XLOG_REG_TYPE_IBROOT;
 377                         vecp++;
 378                         nvecs++;
 379                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 380                 }
 381                 break;
 382
 383         case XFS_DINODE_FMT_LOCAL:
 384                 ASSERT(!(iip->ili_format.ilf_fields &
 385                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 386                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 387                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
 388                         ASSERT(ip->i_df.if_bytes > 0);
 389                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 390                         ASSERT(ip->i_d.di_size > 0);
 391
 392                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
 393                         /*
 394                          * Round i_bytes up to a word boundary.
 395                          * The underlying memory is guaranteed to
 396                          * to be there by xfs_idata_realloc().
 397                          */
 398                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 399                         ASSERT((ip->i_df.if_real_bytes == 0) ||
 400                                (ip->i_df.if_real_bytes == data_bytes));
 401                         vecp->i_len = (int)data_bytes;
 402                         vecp->i_type = XLOG_REG_TYPE_ILOCAL;
 403                         vecp++;
 404                         nvecs++;
 405                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 406                 }
 407                 break;
 408
 409         case XFS_DINODE_FMT_DEV:
 410                 ASSERT(!(iip->ili_format.ilf_fields &
 411                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 412                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
 413                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
 414                         iip->ili_format.ilf_u.ilfu_rdev =
 415                                 ip->i_df.if_u2.if_rdev;
 416                 }
 417                 break;
 418
 419         case XFS_DINODE_FMT_UUID:
 420                 ASSERT(!(iip->ili_format.ilf_fields &
 421                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 422                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
 423                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
 424                         iip->ili_format.ilf_u.ilfu_uuid =
 425                                 ip->i_df.if_u2.if_uuid;
 426                 }
 427                 break;
 428
 429         default:
 430                 ASSERT(0);
 431                 break;
 432         }
 433
 434         /*
 435          * If there are no attributes associated with the file,
 436          * then we're done.
 437          * Assert that no attribute-related log flags are set.
 438          */
 439         if (!XFS_IFORK_Q(ip)) {
 440                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 441                 iip->ili_format.ilf_size = nvecs;
 442                 ASSERT(!(iip->ili_format.ilf_fields &
 443                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 444                 return;
 445         }
 446
 447         switch (ip->i_d.di_aformat) {
 448         case XFS_DINODE_FMT_EXTENTS:
 449                 ASSERT(!(iip->ili_format.ilf_fields &
 450                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
 451                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
 452                         ASSERT(ip->i_afp->if_bytes > 0);
 453                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 454                         ASSERT(ip->i_d.di_anextents > 0);
 455 #ifdef DEBUG
 456                         nrecs = ip->i_afp->if_bytes /
 457                                 (uint)sizeof(xfs_bmbt_rec_t);
 458 #endif
 459                         ASSERT(nrecs > 0);
 460                         ASSERT(nrecs == ip->i_d.di_anextents);
 461 #ifdef XFS_NATIVE_HOST
 462                         /*
 463                          * There are not delayed allocation extents
 464                          * for attributes, so just point at the array.
 465                          */
 466                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
 467                         vecp->i_len = ip->i_afp->if_bytes;
 468 #else
 469                         ASSERT(iip->ili_aextents_buf == NULL);
 470                         /*
 471                          * Need to endian flip before logging
 472                          */
 473                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
 474                                 KM_SLEEP);
 475                         iip->ili_aextents_buf = ext_buffer;
 476                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
 477                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 478                                         XFS_ATTR_FORK);
 479 #endif
 480                         vecp->i_type = XLOG_REG_TYPE_IATTR_EXT;
 481                         iip->ili_format.ilf_asize = vecp->i_len;
 482                         vecp++;
 483                         nvecs++;
 484                 }
 485                 break;
 486
 487         case XFS_DINODE_FMT_BTREE:
 488                 ASSERT(!(iip->ili_format.ilf_fields &
 489                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
 490                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
 491                         ASSERT(ip->i_afp->if_broot_bytes > 0);
 492                         ASSERT(ip->i_afp->if_broot != NULL);
 493                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
 494                         vecp->i_len = ip->i_afp->if_broot_bytes;
 495                         vecp->i_type = XLOG_REG_TYPE_IATTR_BROOT;
 496                         vecp++;
 497                         nvecs++;
 498                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 499                 }
 500                 break;
 501
 502         case XFS_DINODE_FMT_LOCAL:
 503                 ASSERT(!(iip->ili_format.ilf_fields &
 504                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 505                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
 506                         ASSERT(ip->i_afp->if_bytes > 0);
 507                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 508
 509                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
 510                         /*
 511                          * Round i_bytes up to a word boundary.
 512                          * The underlying memory is guaranteed to
 513                          * to be there by xfs_idata_realloc().
 514                          */
 515                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 516                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
 517                                (ip->i_afp->if_real_bytes == data_bytes));
 518                         vecp->i_len = (int)data_bytes;
 519                         vecp->i_type = XLOG_REG_TYPE_IATTR_LOCAL;
 520                         vecp++;
 521                         nvecs++;
 522                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
 523                 }
 524                 break;
 525
 526         default:
 527                 ASSERT(0);
 528                 break;
 529         }
 530
 531         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 532         iip->ili_format.ilf_size = nvecs;
 533 }
 534
 535
 536 /*
 537  * This is called to pin the inode associated with the inode log
 538  * item in memory so it cannot be written out.
 539  */
 540 STATIC void
 541 xfs_inode_item_pin(
 542         xfs_inode_log_item_t    *iip)
 543 {
 544         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
 545
 546         atomic_inc(&iip->ili_inode->i_pincount);
 547 }
 548
 549
 550 /*
 551  * This is called to unpin the inode associated with the inode log
 552  * item which was previously pinned with a call to xfs_inode_item_pin().
 553  *
 554  * Also wake up anyone in xfs_iunpin_wait() if the count goes to 0.
 555  */
 556 /* ARGSUSED */
 557 STATIC void
 558 xfs_inode_item_unpin(
 559         xfs_inode_log_item_t    *iip,
 560         int                     stale)
 561 {
 562         struct xfs_inode        *ip = iip->ili_inode;
 563
 564         ASSERT(atomic_read(&ip->i_pincount) > 0);
 565         if (atomic_dec_and_test(&ip->i_pincount))
 566                 wake_up(&ip->i_ipin_wait);
 567 }
 568
 569 /* ARGSUSED */
 570 STATIC void
 571 xfs_inode_item_unpin_remove(
 572         xfs_inode_log_item_t    *iip,
 573         xfs_trans_t             *tp)
 574 {
 575         xfs_inode_item_unpin(iip, 0);
 576 }
 577
 578 /*
 579  * This is called to attempt to lock the inode associated with this
 580  * inode log item, in preparation for the push routine which does the actual
 581  * iflush.  Don't sleep on the inode lock or the flush lock.
 582  *
 583  * If the flush lock is already held, indicating that the inode has
 584  * been or is in the process of being flushed, then (ideally) we'd like to
 585  * see if the inode's buffer is still incore, and if so give it a nudge.
 586  * We delay doing so until the pushbuf routine, though, to avoid holding
 587  * the AIL lock across a call to the blackhole which is the buffer cache.
 588  * Also we don't want to sleep in any device strategy routines, which can happen
 589  * if we do the subsequent bawrite in here.
 590  */
 591 STATIC uint
 592 xfs_inode_item_trylock(
 593         xfs_inode_log_item_t    *iip)
 594 {
 595         register xfs_inode_t    *ip;
 596
 597         ip = iip->ili_inode;
 598
 599         if (xfs_ipincount(ip) > 0) {
 600                 return XFS_ITEM_PINNED;
 601         }
 602
 603         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
 604                 return XFS_ITEM_LOCKED;
 605         }
 606
 607         if (!xfs_iflock_nowait(ip)) {
 608                 /*
 609                  * inode has already been flushed to the backing buffer,
 610                  * leave it locked in shared mode, pushbuf routine will
 611                  * unlock it.
 612                  */
 613                 return XFS_ITEM_PUSHBUF;
 614         }
 615
 616         /* Stale items should force out the iclog */
 617         if (ip->i_flags & XFS_ISTALE) {
 618                 xfs_ifunlock(ip);
 619                 /*
 620                  * we hold the AIL lock - notify the unlock routine of this
 621                  * so it doesn't try to get the lock again.
 622                  */
 623                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 624                 return XFS_ITEM_PINNED;
 625         }
 626
 627 #ifdef DEBUG
 628         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 629                 ASSERT(iip->ili_format.ilf_fields != 0);
 630                 ASSERT(iip->ili_logged == 0);
 631                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
 632         }
 633 #endif
 634         return XFS_ITEM_SUCCESS;
 635 }
 636
 637 /*
 638  * Unlock the inode associated with the inode log item.
 639  * Clear the fields of the inode and inode log item that
 640  * are specific to the current transaction.  If the
 641  * hold flags is set, do not unlock the inode.
 642  */
 643 STATIC void
 644 xfs_inode_item_unlock(
 645         xfs_inode_log_item_t    *iip)
 646 {
 647         uint            hold;
 648         uint            iolocked;
 649         uint            lock_flags;
 650         xfs_inode_t     *ip;
 651
 652         ASSERT(iip != NULL);
 653         ASSERT(iip->ili_inode->i_itemp != NULL);
 654         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
 655         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 656                   XFS_ILI_IOLOCKED_EXCL)) ||
 657                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_EXCL));
 658         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 659                   XFS_ILI_IOLOCKED_SHARED)) ||
 660                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_SHARED));
 661         /*
 662          * Clear the transaction pointer in the inode.
 663          */
 664         ip = iip->ili_inode;
 665         ip->i_transp = NULL;
 666
 667         /*
 668          * If the inode needed a separate buffer with which to log
 669          * its extents, then free it now.
 670          */
 671         if (iip->ili_extents_buf != NULL) {
 672                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 673                 ASSERT(ip->i_d.di_nextents > 0);
 674                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
 675                 ASSERT(ip->i_df.if_bytes > 0);
 676                 kmem_free(iip->ili_extents_buf);
 677                 iip->ili_extents_buf = NULL;
 678         }
 679         if (iip->ili_aextents_buf != NULL) {
 680                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 681                 ASSERT(ip->i_d.di_anextents > 0);
 682                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
 683                 ASSERT(ip->i_afp->if_bytes > 0);
 684                 kmem_free(iip->ili_aextents_buf);
 685                 iip->ili_aextents_buf = NULL;
 686         }
 687
 688         /*
 689          * Figure out if we should unlock the inode or not.
 690          */
 691         hold = iip->ili_flags & XFS_ILI_HOLD;
 692
 693         /*
 694          * Before clearing out the flags, remember whether we
 695          * are holding the inode's IO lock.
 696          */
 697         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
 698
 699         /*
 700          * Clear out the fields of the inode log item particular
 701          * to the current transaction.
 702          */
 703         iip->ili_flags = 0;
 704
 705         /*
 706          * Unlock the inode if XFS_ILI_HOLD was not set.
 707          */
 708         if (!hold) {
 709                 lock_flags = XFS_ILOCK_EXCL;
 710                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
 711                         lock_flags |= XFS_IOLOCK_EXCL;
 712                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
 713                         lock_flags |= XFS_IOLOCK_SHARED;
 714                 }
 715                 xfs_iput(iip->ili_inode, lock_flags);
 716         }
 717 }
 718
 719 /*
 720  * This is called to find out where the oldest active copy of the
 721  * inode log item in the on disk log resides now that the last log
 722  * write of it completed at the given lsn.  Since we always re-log
 723  * all dirty data in an inode, the latest copy in the on disk log
 724  * is the only one that matters.  Therefore, simply return the
 725  * given lsn.
 726  */
 727 /*ARGSUSED*/
 728 STATIC xfs_lsn_t
 729 xfs_inode_item_committed(
 730         xfs_inode_log_item_t    *iip,
 731         xfs_lsn_t               lsn)
 732 {
 733         return (lsn);
 734 }
 735
 736 /*
 737  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 738  * failed to get the inode flush lock but did get the inode locked SHARED.
 739  * Here we're trying to see if the inode buffer is incore, and if so whether it's
 740  * marked delayed write. If that's the case, we'll promote it and that will
 741  * allow the caller to write the buffer by triggering the xfsbufd to run.
 742  */
 743 STATIC void
 744 xfs_inode_item_pushbuf(
 745         xfs_inode_log_item_t    *iip)
 746 {
 747         xfs_inode_t     *ip;
 748         xfs_mount_t     *mp;
 749         xfs_buf_t       *bp;
 750
 751         ip = iip->ili_inode;
 752         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
 753
 754         /*
 755          * If a flush is not in progress anymore, chances are that the
 756          * inode was taken off the AIL. So, just get out.
 757          */
 758         if (completion_done(&ip->i_flush) ||
 759             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 760                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
 761                 return;
 762         }
 763
 764         mp = ip->i_mount;
 765         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
 766                     iip->ili_format.ilf_len, XBF_TRYLOCK);
 767
 768         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 769         if (!bp)
 770                 return;
 771         if (XFS_BUF_ISDELAYWRITE(bp))
 772                 xfs_buf_delwri_promote(bp);
 773         xfs_buf_relse(bp);
 774         return;
 775 }
 776
 777
 778 /*
 779  * This is called to asynchronously write the inode associated with this
 780  * inode log item out to disk. The inode will already have been locked by
 781  * a successful call to xfs_inode_item_trylock().
 782  */
 783 STATIC void
 784 xfs_inode_item_push(
 785         xfs_inode_log_item_t    *iip)
 786 {
 787         xfs_inode_t     *ip;
 788
 789         ip = iip->ili_inode;
 790
 791         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
 792         ASSERT(!completion_done(&ip->i_flush));
 793         /*
 794          * Since we were able to lock the inode's flush lock and
 795          * we found it on the AIL, the inode must be dirty.  This
 796          * is because the inode is removed from the AIL while still
 797          * holding the flush lock in xfs_iflush_done().  Thus, if
 798          * we found it in the AIL and were able to obtain the flush
 799          * lock without sleeping, then there must not have been
 800          * anyone in the process of flushing the inode.
 801          */
 802         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
 803                iip->ili_format.ilf_fields != 0);
 804
 805         /*
 806          * Push the inode to it's backing buffer. This will not remove the
 807          * inode from the AIL - a further push will be required to trigger a
 808          * buffer push. However, this allows all the dirty inodes to be pushed
 809          * to the buffer before it is pushed to disk. THe buffer IO completion
 810          * will pull th einode from the AIL, mark it clean and unlock the flush
 811          * lock.
 812          */
 813         (void) xfs_iflush(ip, 0);
 814         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 815
 816         return;
 817 }
 818
 819 /*
 820  * XXX rcc - this one really has to do something.  Probably needs
 821  * to stamp in a new field in the incore inode.
 822  */
 823 /* ARGSUSED */
 824 STATIC void
 825 xfs_inode_item_committing(
 826         xfs_inode_log_item_t    *iip,
 827         xfs_lsn_t               lsn)
 828 {
 829         iip->ili_last_lsn = lsn;
 830         return;
 831 }
 832
 833 /*
 834  * This is the ops vector shared by all buf log items.
 835  */
 836 static struct xfs_item_ops xfs_inode_item_ops = {
 837         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
 838         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 839                                         xfs_inode_item_format,
 840         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
 841         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
 842         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 843                                         xfs_inode_item_unpin_remove,
 844         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
 845         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
 846         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 847                                         xfs_inode_item_committed,
 848         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
 849         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
 850         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 851                                         xfs_inode_item_committing
 852 };
 853
 854
 855 /*
 856  * Initialize the inode log item for a newly allocated (in-core) inode.
 857  */
 858 void
 859 xfs_inode_item_init(
 860         xfs_inode_t     *ip,
 861         xfs_mount_t     *mp)
 862 {
 863         xfs_inode_log_item_t    *iip;
 864
 865         ASSERT(ip->i_itemp == NULL);
 866         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 867
 868         iip->ili_inode = ip;
 869         xfs_log_item_init(mp, &iip->ili_item, XFS_LI_INODE,
 870                                                 &xfs_inode_item_ops);
 871         iip->ili_format.ilf_type = XFS_LI_INODE;
 872         iip->ili_format.ilf_ino = ip->i_ino;
 873         iip->ili_format.ilf_blkno = ip->i_imap.im_blkno;
 874         iip->ili_format.ilf_len = ip->i_imap.im_len;
 875         iip->ili_format.ilf_boffset = ip->i_imap.im_boffset;
 876 }
 877
 878 /*
 879  * Free the inode log item and any memory hanging off of it.
 880  */
 881 void
 882 xfs_inode_item_destroy(
 883         xfs_inode_t     *ip)
 884 {
 885 #ifdef XFS_TRANS_DEBUG
 886         if (ip->i_itemp->ili_root_size != 0) {
 887                 kmem_free(ip->i_itemp->ili_orig_root);
 888         }
 889 #endif
 890         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 891 }
 892
 893
 894 /*
 895  * This is the inode flushing I/O completion routine.  It is called
 896  * from interrupt level when the buffer containing the inode is
 897  * flushed to disk.  It is responsible for removing the inode item
 898  * from the AIL if it has not been re-logged, and unlocking the inode's
 899  * flush lock.
 900  */
 901 /*ARGSUSED*/
 902 void
 903 xfs_iflush_done(
 904         xfs_buf_t               *bp,
 905         xfs_inode_log_item_t    *iip)
 906 {
 907         xfs_inode_t             *ip = iip->ili_inode;
 908         struct xfs_ail          *ailp = iip->ili_item.li_ailp;
 909
 910         /*
 911          * We only want to pull the item from the AIL if it is
 912          * actually there and its location in the log has not
 913          * changed since we started the flush.  Thus, we only bother
 914          * if the ili_logged flag is set and the inode's lsn has not
 915          * changed.  First we check the lsn outside
 916          * the lock since it's cheaper, and then we recheck while
 917          * holding the lock before removing the inode from the AIL.
 918          */
 919         if (iip->ili_logged &&
 920             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
 921                 spin_lock(&ailp->xa_lock);
 922                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
 923                         /* xfs_trans_ail_delete() drops the AIL lock. */
 924                         xfs_trans_ail_delete(ailp, (xfs_log_item_t*)iip);
 925                 } else {
 926                         spin_unlock(&ailp->xa_lock);
 927                 }
 928         }
 929
 930         iip->ili_logged = 0;
 931
 932         /*
 933          * Clear the ili_last_fields bits now that we know that the
 934          * data corresponding to them is safely on disk.
 935          */
 936         iip->ili_last_fields = 0;
 937
 938         /*
 939          * Release the inode's flush lock since we're done with it.
 940          */
 941         xfs_ifunlock(ip);
 942
 943         return;
 944 }
 945
 946 /*
 947  * This is the inode flushing abort routine.  It is called
 948  * from xfs_iflush when the filesystem is shutting down to clean
 949  * up the inode state.
 950  * It is responsible for removing the inode item
 951  * from the AIL if it has not been re-logged, and unlocking the inode's
 952  * flush lock.
 953  */
 954 void
 955 xfs_iflush_abort(
 956         xfs_inode_t             *ip)
 957 {
 958         xfs_inode_log_item_t    *iip = ip->i_itemp;
 959         xfs_mount_t             *mp;
 960
 961         iip = ip->i_itemp;
 962         mp = ip->i_mount;
 963         if (iip) {
 964                 struct xfs_ail  *ailp = iip->ili_item.li_ailp;
 965                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 966                         spin_lock(&ailp->xa_lock);
 967                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
 968                                 /* xfs_trans_ail_delete() drops the AIL lock. */
 969                                 xfs_trans_ail_delete(ailp, (xfs_log_item_t *)iip);
 970                         } else
 971                                 spin_unlock(&ailp->xa_lock);
 972                 }
 973                 iip->ili_logged = 0;
 974                 /*
 975                  * Clear the ili_last_fields bits now that we know that the
 976                  * data corresponding to them is safely on disk.
 977                  */
 978                 iip->ili_last_fields = 0;
 979                 /*
 980                  * Clear the inode logging fields so no more flushes are
 981                  * attempted.
 982                  */
 983                 iip->ili_format.ilf_fields = 0;
 984         }
 985         /*
 986          * Release the inode's flush lock since we're done with it.
 987          */
 988         xfs_ifunlock(ip);
 989 }
 990
 991 void
 992 xfs_istale_done(
 993         xfs_buf_t               *bp,
 994         xfs_inode_log_item_t    *iip)
 995 {
 996         xfs_iflush_abort(iip->ili_inode);
 997 }
 998
 999 /*
1000  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
1001  * (which can have different field alignments) to the native version
1002  */
1003 int
1004 xfs_inode_item_format_convert(
1005         xfs_log_iovec_t         *buf,
1006         xfs_inode_log_format_t  *in_f)
1007 {
1008         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
1009                 xfs_inode_log_format_32_t *in_f32;
1010
1011                 in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
1012                 in_f->ilf_type = in_f32->ilf_type;
1013                 in_f->ilf_size = in_f32->ilf_size;
1014                 in_f->ilf_fields = in_f32->ilf_fields;
1015                 in_f->ilf_asize = in_f32->ilf_asize;
1016                 in_f->ilf_dsize = in_f32->ilf_dsize;
1017                 in_f->ilf_ino = in_f32->ilf_ino;
1018                 /* copy biggest field of ilf_u */
1019                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1020                        in_f32->ilf_u.ilfu_uuid.__u_bits,
1021                        sizeof(uuid_t));
1022                 in_f->ilf_blkno = in_f32->ilf_blkno;
1023                 in_f->ilf_len = in_f32->ilf_len;
1024                 in_f->ilf_boffset = in_f32->ilf_boffset;
1025                 return 0;
1026         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
1027                 xfs_inode_log_format_64_t *in_f64;
1028
1029                 in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
1030                 in_f->ilf_type = in_f64->ilf_type;
1031                 in_f->ilf_size = in_f64->ilf_size;
1032                 in_f->ilf_fields = in_f64->ilf_fields;
1033                 in_f->ilf_asize = in_f64->ilf_asize;
1034                 in_f->ilf_dsize = in_f64->ilf_dsize;
1035                 in_f->ilf_ino = in_f64->ilf_ino;
1036                 /* copy biggest field of ilf_u */
1037                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1038                        in_f64->ilf_u.ilfu_uuid.__u_bits,
1039                        sizeof(uuid_t));
1040                 in_f->ilf_blkno = in_f64->ilf_blkno;
1041                 in_f->ilf_len = in_f64->ilf_len;
1042                 in_f->ilf_boffset = in_f64->ilf_boffset;
1043                 return 0;
1044         }
1045         return EFSCORRUPTED;
1046 }