git.oblomov.eu Git - 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_dir.h"
  29 #include "xfs_dir2.h"
  30 #include "xfs_dmapi.h"
  31 #include "xfs_mount.h"
  32 #include "xfs_trans_priv.h"
  33 #include "xfs_bmap_btree.h"
  34 #include "xfs_alloc_btree.h"
  35 #include "xfs_ialloc_btree.h"
  36 #include "xfs_dir_sf.h"
  37 #include "xfs_dir2_sf.h"
  38 #include "xfs_attr_sf.h"
  39 #include "xfs_dinode.h"
  40 #include "xfs_inode.h"
  41 #include "xfs_inode_item.h"
  42 #include "xfs_btree.h"
  43 #include "xfs_ialloc.h"
  44 #include "xfs_rw.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         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
 232         vecp++;
 233         nvecs        = 1;
 234
 235         /*
 236          * Clear i_update_core if the timestamps (or any other
 237          * non-transactional modification) need flushing/logging
 238          * and we're about to log them with the rest of the core.
 239          *
 240          * This is the same logic as xfs_iflush() but this code can't
 241          * run at the same time as xfs_iflush because we're in commit
 242          * processing here and so we have the inode lock held in
 243          * exclusive mode.  Although it doesn't really matter
 244          * for the timestamps if both routines were to grab the
 245          * timestamps or not.  That would be ok.
 246          *
 247          * We clear i_update_core before copying out the data.
 248          * This is for coordination with our timestamp updates
 249          * that don't hold the inode lock. They will always
 250          * update the timestamps BEFORE setting i_update_core,
 251          * so if we clear i_update_core after they set it we
 252          * are guaranteed to see their updates to the timestamps
 253          * either here.  Likewise, if they set it after we clear it
 254          * here, we'll see it either on the next commit of this
 255          * inode or the next time the inode gets flushed via
 256          * xfs_iflush().  This depends on strongly ordered memory
 257          * semantics, but we have that.  We use the SYNCHRONIZE
 258          * macro to make sure that the compiler does not reorder
 259          * the i_update_core access below the data copy below.
 260          */
 261         if (ip->i_update_core)  {
 262                 ip->i_update_core = 0;
 263                 SYNCHRONIZE();
 264         }
 265
 266         /*
 267          * We don't have to worry about re-ordering here because
 268          * the update_size field is protected by the inode lock
 269          * and we have that held in exclusive mode.
 270          */
 271         if (ip->i_update_size)
 272                 ip->i_update_size = 0;
 273
 274         /*
 275          * Make sure to get the latest atime from the Linux inode.
 276          */
 277         xfs_synchronize_atime(ip);
 278
 279         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
 280         vecp->i_len  = sizeof(xfs_dinode_core_t);
 281         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
 282         vecp++;
 283         nvecs++;
 284         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
 285
 286         /*
 287          * If this is really an old format inode, then we need to
 288          * log it as such.  This means that we have to copy the link
 289          * count from the new field to the old.  We don't have to worry
 290          * about the new fields, because nothing trusts them as long as
 291          * the old inode version number is there.  If the superblock already
 292          * has a new version number, then we don't bother converting back.
 293          */
 294         mp = ip->i_mount;
 295         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
 296                XFS_SB_VERSION_HASNLINK(&mp->m_sb));
 297         if (ip->i_d.di_version == XFS_DINODE_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 = XFS_DINODE_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                                 XLOG_VEC_SET_TYPE(vecp, 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                                 XLOG_VEC_SET_TYPE(vecp, 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                         XLOG_VEC_SET_TYPE(vecp, 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                         XLOG_VEC_SET_TYPE(vecp, 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                         XLOG_VEC_SET_TYPE(vecp, 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                         XLOG_VEC_SET_TYPE(vecp, 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                         XLOG_VEC_SET_TYPE(vecp, 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.  Do this by calling
 539  * xfs_ipin() to bump the pin count in the inode while holding the
 540  * inode pin lock.
 541  */
 542 STATIC void
 543 xfs_inode_item_pin(
 544         xfs_inode_log_item_t    *iip)
 545 {
 546         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 547         xfs_ipin(iip->ili_inode);
 548 }
 549
 550
 551 /*
 552  * This is called to unpin the inode associated with the inode log
 553  * item which was previously pinned with a call to xfs_inode_item_pin().
 554  * Just call xfs_iunpin() on the inode to do this.
 555  */
 556 /* ARGSUSED */
 557 STATIC void
 558 xfs_inode_item_unpin(
 559         xfs_inode_log_item_t    *iip,
 560         int                     stale)
 561 {
 562         xfs_iunpin(iip->ili_inode);
 563 }
 564
 565 /* ARGSUSED */
 566 STATIC void
 567 xfs_inode_item_unpin_remove(
 568         xfs_inode_log_item_t    *iip,
 569         xfs_trans_t             *tp)
 570 {
 571         xfs_iunpin(iip->ili_inode);
 572 }
 573
 574 /*
 575  * This is called to attempt to lock the inode associated with this
 576  * inode log item, in preparation for the push routine which does the actual
 577  * iflush.  Don't sleep on the inode lock or the flush lock.
 578  *
 579  * If the flush lock is already held, indicating that the inode has
 580  * been or is in the process of being flushed, then (ideally) we'd like to
 581  * see if the inode's buffer is still incore, and if so give it a nudge.
 582  * We delay doing so until the pushbuf routine, though, to avoid holding
 583  * the AIL lock across a call to the blackhole which is the buffer cache.
 584  * Also we don't want to sleep in any device strategy routines, which can happen
 585  * if we do the subsequent bawrite in here.
 586  */
 587 STATIC uint
 588 xfs_inode_item_trylock(
 589         xfs_inode_log_item_t    *iip)
 590 {
 591         register xfs_inode_t    *ip;
 592
 593         ip = iip->ili_inode;
 594
 595         if (xfs_ipincount(ip) > 0) {
 596                 return XFS_ITEM_PINNED;
 597         }
 598
 599         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
 600                 return XFS_ITEM_LOCKED;
 601         }
 602
 603         if (!xfs_iflock_nowait(ip)) {
 604                 /*
 605                  * If someone else isn't already trying to push the inode
 606                  * buffer, we get to do it.
 607                  */
 608                 if (iip->ili_pushbuf_flag == 0) {
 609                         iip->ili_pushbuf_flag = 1;
 610 #ifdef DEBUG
 611                         iip->ili_push_owner = current_pid();
 612 #endif
 613                         /*
 614                          * Inode is left locked in shared mode.
 615                          * Pushbuf routine gets to unlock it.
 616                          */
 617                         return XFS_ITEM_PUSHBUF;
 618                 } else {
 619                         /*
 620                          * We hold the AIL_LOCK, so we must specify the
 621                          * NONOTIFY flag so that we won't double trip.
 622                          */
 623                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 624                         return XFS_ITEM_FLUSHING;
 625                 }
 626                 /* NOTREACHED */
 627         }
 628
 629         /* Stale items should force out the iclog */
 630         if (ip->i_flags & XFS_ISTALE) {
 631                 xfs_ifunlock(ip);
 632                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 633                 return XFS_ITEM_PINNED;
 634         }
 635
 636 #ifdef DEBUG
 637         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 638                 ASSERT(iip->ili_format.ilf_fields != 0);
 639                 ASSERT(iip->ili_logged == 0);
 640                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
 641         }
 642 #endif
 643         return XFS_ITEM_SUCCESS;
 644 }
 645
 646 /*
 647  * Unlock the inode associated with the inode log item.
 648  * Clear the fields of the inode and inode log item that
 649  * are specific to the current transaction.  If the
 650  * hold flags is set, do not unlock the inode.
 651  */
 652 STATIC void
 653 xfs_inode_item_unlock(
 654         xfs_inode_log_item_t    *iip)
 655 {
 656         uint            hold;
 657         uint            iolocked;
 658         uint            lock_flags;
 659         xfs_inode_t     *ip;
 660
 661         ASSERT(iip != NULL);
 662         ASSERT(iip->ili_inode->i_itemp != NULL);
 663         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 664         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 665                   XFS_ILI_IOLOCKED_EXCL)) ||
 666                ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
 667         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 668                   XFS_ILI_IOLOCKED_SHARED)) ||
 669                ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
 670         /*
 671          * Clear the transaction pointer in the inode.
 672          */
 673         ip = iip->ili_inode;
 674         ip->i_transp = NULL;
 675
 676         /*
 677          * If the inode needed a separate buffer with which to log
 678          * its extents, then free it now.
 679          */
 680         if (iip->ili_extents_buf != NULL) {
 681                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 682                 ASSERT(ip->i_d.di_nextents > 0);
 683                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
 684                 ASSERT(ip->i_df.if_bytes > 0);
 685                 kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
 686                 iip->ili_extents_buf = NULL;
 687         }
 688         if (iip->ili_aextents_buf != NULL) {
 689                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 690                 ASSERT(ip->i_d.di_anextents > 0);
 691                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
 692                 ASSERT(ip->i_afp->if_bytes > 0);
 693                 kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
 694                 iip->ili_aextents_buf = NULL;
 695         }
 696
 697         /*
 698          * Figure out if we should unlock the inode or not.
 699          */
 700         hold = iip->ili_flags & XFS_ILI_HOLD;
 701
 702         /*
 703          * Before clearing out the flags, remember whether we
 704          * are holding the inode's IO lock.
 705          */
 706         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
 707
 708         /*
 709          * Clear out the fields of the inode log item particular
 710          * to the current transaction.
 711          */
 712         iip->ili_ilock_recur = 0;
 713         iip->ili_iolock_recur = 0;
 714         iip->ili_flags = 0;
 715
 716         /*
 717          * Unlock the inode if XFS_ILI_HOLD was not set.
 718          */
 719         if (!hold) {
 720                 lock_flags = XFS_ILOCK_EXCL;
 721                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
 722                         lock_flags |= XFS_IOLOCK_EXCL;
 723                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
 724                         lock_flags |= XFS_IOLOCK_SHARED;
 725                 }
 726                 xfs_iput(iip->ili_inode, lock_flags);
 727         }
 728 }
 729
 730 /*
 731  * This is called to find out where the oldest active copy of the
 732  * inode log item in the on disk log resides now that the last log
 733  * write of it completed at the given lsn.  Since we always re-log
 734  * all dirty data in an inode, the latest copy in the on disk log
 735  * is the only one that matters.  Therefore, simply return the
 736  * given lsn.
 737  */
 738 /*ARGSUSED*/
 739 STATIC xfs_lsn_t
 740 xfs_inode_item_committed(
 741         xfs_inode_log_item_t    *iip,
 742         xfs_lsn_t               lsn)
 743 {
 744         return (lsn);
 745 }
 746
 747 /*
 748  * The transaction with the inode locked has aborted.  The inode
 749  * must not be dirty within the transaction (unless we're forcibly
 750  * shutting down).  We simply unlock just as if the transaction
 751  * had been cancelled.
 752  */
 753 STATIC void
 754 xfs_inode_item_abort(
 755         xfs_inode_log_item_t    *iip)
 756 {
 757         xfs_inode_item_unlock(iip);
 758         return;
 759 }
 760
 761
 762 /*
 763  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 764  * failed to get the inode flush lock but did get the inode locked SHARED.
 765  * Here we're trying to see if the inode buffer is incore, and if so whether it's
 766  * marked delayed write. If that's the case, we'll initiate a bawrite on that
 767  * buffer to expedite the process.
 768  *
 769  * We aren't holding the AIL_LOCK (or the flush lock) when this gets called,
 770  * so it is inherently race-y.
 771  */
 772 STATIC void
 773 xfs_inode_item_pushbuf(
 774         xfs_inode_log_item_t    *iip)
 775 {
 776         xfs_inode_t     *ip;
 777         xfs_mount_t     *mp;
 778         xfs_buf_t       *bp;
 779         uint            dopush;
 780
 781         ip = iip->ili_inode;
 782
 783         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 784
 785         /*
 786          * The ili_pushbuf_flag keeps others from
 787          * trying to duplicate our effort.
 788          */
 789         ASSERT(iip->ili_pushbuf_flag != 0);
 790         ASSERT(iip->ili_push_owner == current_pid());
 791
 792         /*
 793          * If flushlock isn't locked anymore, chances are that the
 794          * inode flush completed and the inode was taken off the AIL.
 795          * So, just get out.
 796          */
 797         if ((valusema(&(ip->i_flock)) > 0)  ||
 798             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 799                 iip->ili_pushbuf_flag = 0;
 800                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
 801                 return;
 802         }
 803
 804         mp = ip->i_mount;
 805         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
 806                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
 807
 808         if (bp != NULL) {
 809                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 810                         /*
 811                          * We were racing with iflush because we don't hold
 812                          * the AIL_LOCK or the flush lock. However, at this point,
 813                          * we have the buffer, and we know that it's dirty.
 814                          * So, it's possible that iflush raced with us, and
 815                          * this item is already taken off the AIL.
 816                          * If not, we can flush it async.
 817                          */
 818                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
 819                                   (valusema(&(ip->i_flock)) <= 0));
 820                         iip->ili_pushbuf_flag = 0;
 821                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 822                         xfs_buftrace("INODE ITEM PUSH", bp);
 823                         if (XFS_BUF_ISPINNED(bp)) {
 824                                 xfs_log_force(mp, (xfs_lsn_t)0,
 825                                               XFS_LOG_FORCE);
 826                         }
 827                         if (dopush) {
 828                                 xfs_bawrite(mp, bp);
 829                         } else {
 830                                 xfs_buf_relse(bp);
 831                         }
 832                 } else {
 833                         iip->ili_pushbuf_flag = 0;
 834                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 835                         xfs_buf_relse(bp);
 836                 }
 837                 return;
 838         }
 839         /*
 840          * We have to be careful about resetting pushbuf flag too early (above).
 841          * Even though in theory we can do it as soon as we have the buflock,
 842          * we don't want others to be doing work needlessly. They'll come to
 843          * this function thinking that pushing the buffer is their
 844          * responsibility only to find that the buffer is still locked by
 845          * another doing the same thing
 846          */
 847         iip->ili_pushbuf_flag = 0;
 848         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 849         return;
 850 }
 851
 852
 853 /*
 854  * This is called to asynchronously write the inode associated with this
 855  * inode log item out to disk. The inode will already have been locked by
 856  * a successful call to xfs_inode_item_trylock().
 857  */
 858 STATIC void
 859 xfs_inode_item_push(
 860         xfs_inode_log_item_t    *iip)
 861 {
 862         xfs_inode_t     *ip;
 863
 864         ip = iip->ili_inode;
 865
 866         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 867         ASSERT(valusema(&(ip->i_flock)) <= 0);
 868         /*
 869          * Since we were able to lock the inode's flush lock and
 870          * we found it on the AIL, the inode must be dirty.  This
 871          * is because the inode is removed from the AIL while still
 872          * holding the flush lock in xfs_iflush_done().  Thus, if
 873          * we found it in the AIL and were able to obtain the flush
 874          * lock without sleeping, then there must not have been
 875          * anyone in the process of flushing the inode.
 876          */
 877         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
 878                iip->ili_format.ilf_fields != 0);
 879
 880         /*
 881          * Write out the inode.  The completion routine ('iflush_done') will
 882          * pull it from the AIL, mark it clean, unlock the flush lock.
 883          */
 884         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
 885         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 886
 887         return;
 888 }
 889
 890 /*
 891  * XXX rcc - this one really has to do something.  Probably needs
 892  * to stamp in a new field in the incore inode.
 893  */
 894 /* ARGSUSED */
 895 STATIC void
 896 xfs_inode_item_committing(
 897         xfs_inode_log_item_t    *iip,
 898         xfs_lsn_t               lsn)
 899 {
 900         iip->ili_last_lsn = lsn;
 901         return;
 902 }
 903
 904 /*
 905  * This is the ops vector shared by all buf log items.
 906  */
 907 STATIC struct xfs_item_ops xfs_inode_item_ops = {
 908         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
 909         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 910                                         xfs_inode_item_format,
 911         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
 912         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
 913         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 914                                         xfs_inode_item_unpin_remove,
 915         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
 916         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
 917         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 918                                         xfs_inode_item_committed,
 919         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
 920         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_inode_item_abort,
 921         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
 922         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 923                                         xfs_inode_item_committing
 924 };
 925
 926
 927 /*
 928  * Initialize the inode log item for a newly allocated (in-core) inode.
 929  */
 930 void
 931 xfs_inode_item_init(
 932         xfs_inode_t     *ip,
 933         xfs_mount_t     *mp)
 934 {
 935         xfs_inode_log_item_t    *iip;
 936
 937         ASSERT(ip->i_itemp == NULL);
 938         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 939
 940         iip->ili_item.li_type = XFS_LI_INODE;
 941         iip->ili_item.li_ops = &xfs_inode_item_ops;
 942         iip->ili_item.li_mountp = mp;
 943         iip->ili_inode = ip;
 944
 945         /*
 946            We have zeroed memory. No need ...
 947            iip->ili_extents_buf = NULL;
 948            iip->ili_pushbuf_flag = 0;
 949          */
 950
 951         iip->ili_format.ilf_type = XFS_LI_INODE;
 952         iip->ili_format.ilf_ino = ip->i_ino;
 953         iip->ili_format.ilf_blkno = ip->i_blkno;
 954         iip->ili_format.ilf_len = ip->i_len;
 955         iip->ili_format.ilf_boffset = ip->i_boffset;
 956 }
 957
 958 /*
 959  * Free the inode log item and any memory hanging off of it.
 960  */
 961 void
 962 xfs_inode_item_destroy(
 963         xfs_inode_t     *ip)
 964 {
 965 #ifdef XFS_TRANS_DEBUG
 966         if (ip->i_itemp->ili_root_size != 0) {
 967                 kmem_free(ip->i_itemp->ili_orig_root,
 968                           ip->i_itemp->ili_root_size);
 969         }
 970 #endif
 971         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 972 }
 973
 974
 975 /*
 976  * This is the inode flushing I/O completion routine.  It is called
 977  * from interrupt level when the buffer containing the inode is
 978  * flushed to disk.  It is responsible for removing the inode item
 979  * from the AIL if it has not been re-logged, and unlocking the inode's
 980  * flush lock.
 981  */
 982 /*ARGSUSED*/
 983 void
 984 xfs_iflush_done(
 985         xfs_buf_t               *bp,
 986         xfs_inode_log_item_t    *iip)
 987 {
 988         xfs_inode_t     *ip;
 989         SPLDECL(s);
 990
 991         ip = iip->ili_inode;
 992
 993         /*
 994          * We only want to pull the item from the AIL if it is
 995          * actually there and its location in the log has not
 996          * changed since we started the flush.  Thus, we only bother
 997          * if the ili_logged flag is set and the inode's lsn has not
 998          * changed.  First we check the lsn outside
 999          * the lock since it's cheaper, and then we recheck while
1000          * holding the lock before removing the inode from the AIL.
1001          */
1002         if (iip->ili_logged &&
1003             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
1004                 AIL_LOCK(ip->i_mount, s);
1005                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
1006                         /*
1007                          * xfs_trans_delete_ail() drops the AIL lock.
1008                          */
1009                         xfs_trans_delete_ail(ip->i_mount,
1010                                              (xfs_log_item_t*)iip, s);
1011                 } else {
1012                         AIL_UNLOCK(ip->i_mount, s);
1013                 }
1014         }
1015
1016         iip->ili_logged = 0;
1017
1018         /*
1019          * Clear the ili_last_fields bits now that we know that the
1020          * data corresponding to them is safely on disk.
1021          */
1022         iip->ili_last_fields = 0;
1023
1024         /*
1025          * Release the inode's flush lock since we're done with it.
1026          */
1027         xfs_ifunlock(ip);
1028
1029         return;
1030 }
1031
1032 /*
1033  * This is the inode flushing abort routine.  It is called
1034  * from xfs_iflush when the filesystem is shutting down to clean
1035  * up the inode state.
1036  * It is responsible for removing the inode item
1037  * from the AIL if it has not been re-logged, and unlocking the inode's
1038  * flush lock.
1039  */
1040 void
1041 xfs_iflush_abort(
1042         xfs_inode_t             *ip)
1043 {
1044         xfs_inode_log_item_t    *iip;
1045         xfs_mount_t             *mp;
1046         SPLDECL(s);
1047
1048         iip = ip->i_itemp;
1049         mp = ip->i_mount;
1050         if (iip) {
1051                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1052                         AIL_LOCK(mp, s);
1053                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1054                                 /*
1055                                  * xfs_trans_delete_ail() drops the AIL lock.
1056                                  */
1057                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
1058                                         s);
1059                         } else
1060                                 AIL_UNLOCK(mp, s);
1061                 }
1062                 iip->ili_logged = 0;
1063                 /*
1064                  * Clear the ili_last_fields bits now that we know that the
1065                  * data corresponding to them is safely on disk.
1066                  */
1067                 iip->ili_last_fields = 0;
1068                 /*
1069                  * Clear the inode logging fields so no more flushes are
1070                  * attempted.
1071                  */
1072                 iip->ili_format.ilf_fields = 0;
1073         }
1074         /*
1075          * Release the inode's flush lock since we're done with it.
1076          */
1077         xfs_ifunlock(ip);
1078 }
1079
1080 void
1081 xfs_istale_done(
1082         xfs_buf_t               *bp,
1083         xfs_inode_log_item_t    *iip)
1084 {
1085         xfs_iflush_abort(iip->ili_inode);
1086 }