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_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
  45
  46 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  47
  48 /*
  49  * This returns the number of iovecs needed to log the given inode item.
  50  *
  51  * We need one iovec for the inode log format structure, one for the
  52  * inode core, and possibly one for the inode data/extents/b-tree root
  53  * and one for the inode attribute data/extents/b-tree root.
  54  */
  55 STATIC uint
  56 xfs_inode_item_size(
  57         xfs_inode_log_item_t    *iip)
  58 {
  59         uint            nvecs;
  60         xfs_inode_t     *ip;
  61
  62         ip = iip->ili_inode;
  63         nvecs = 2;
  64
  65         /*
  66          * Only log the data/extents/b-tree root if there is something
  67          * left to log.
  68          */
  69         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  70
  71         switch (ip->i_d.di_format) {
  72         case XFS_DINODE_FMT_EXTENTS:
  73                 iip->ili_format.ilf_fields &=
  74                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  75                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  76                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
  77                     (ip->i_d.di_nextents > 0) &&
  78                     (ip->i_df.if_bytes > 0)) {
  79                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
  80                         nvecs++;
  81                 } else {
  82                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
  83                 }
  84                 break;
  85
  86         case XFS_DINODE_FMT_BTREE:
  87                 ASSERT(ip->i_df.if_ext_max ==
  88                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
  89                 iip->ili_format.ilf_fields &=
  90                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
  91                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  92                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
  93                     (ip->i_df.if_broot_bytes > 0)) {
  94                         ASSERT(ip->i_df.if_broot != NULL);
  95                         nvecs++;
  96                 } else {
  97                         ASSERT(!(iip->ili_format.ilf_fields &
  98                                  XFS_ILOG_DBROOT));
  99 #ifdef XFS_TRANS_DEBUG
 100                         if (iip->ili_root_size > 0) {
 101                                 ASSERT(iip->ili_root_size ==
 102                                        ip->i_df.if_broot_bytes);
 103                                 ASSERT(memcmp(iip->ili_orig_root,
 104                                             ip->i_df.if_broot,
 105                                             iip->ili_root_size) == 0);
 106                         } else {
 107                                 ASSERT(ip->i_df.if_broot_bytes == 0);
 108                         }
 109 #endif
 110                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
 111                 }
 112                 break;
 113
 114         case XFS_DINODE_FMT_LOCAL:
 115                 iip->ili_format.ilf_fields &=
 116                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 117                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 118                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
 119                     (ip->i_df.if_bytes > 0)) {
 120                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 121                         ASSERT(ip->i_d.di_size > 0);
 122                         nvecs++;
 123                 } else {
 124                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
 125                 }
 126                 break;
 127
 128         case XFS_DINODE_FMT_DEV:
 129                 iip->ili_format.ilf_fields &=
 130                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 131                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 132                 break;
 133
 134         case XFS_DINODE_FMT_UUID:
 135                 iip->ili_format.ilf_fields &=
 136                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 137                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 138                 break;
 139
 140         default:
 141                 ASSERT(0);
 142                 break;
 143         }
 144
 145         /*
 146          * If there are no attributes associated with this file,
 147          * then there cannot be anything more to log.
 148          * Clear all attribute-related log flags.
 149          */
 150         if (!XFS_IFORK_Q(ip)) {
 151                 iip->ili_format.ilf_fields &=
 152                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 153                 return nvecs;
 154         }
 155
 156         /*
 157          * Log any necessary attribute data.
 158          */
 159         switch (ip->i_d.di_aformat) {
 160         case XFS_DINODE_FMT_EXTENTS:
 161                 iip->ili_format.ilf_fields &=
 162                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 163                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
 164                     (ip->i_d.di_anextents > 0) &&
 165                     (ip->i_afp->if_bytes > 0)) {
 166                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 167                         nvecs++;
 168                 } else {
 169                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
 170                 }
 171                 break;
 172
 173         case XFS_DINODE_FMT_BTREE:
 174                 iip->ili_format.ilf_fields &=
 175                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 176                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
 177                     (ip->i_afp->if_broot_bytes > 0)) {
 178                         ASSERT(ip->i_afp->if_broot != NULL);
 179                         nvecs++;
 180                 } else {
 181                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
 182                 }
 183                 break;
 184
 185         case XFS_DINODE_FMT_LOCAL:
 186                 iip->ili_format.ilf_fields &=
 187                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 188                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
 189                     (ip->i_afp->if_bytes > 0)) {
 190                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 191                         nvecs++;
 192                 } else {
 193                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
 194                 }
 195                 break;
 196
 197         default:
 198                 ASSERT(0);
 199                 break;
 200         }
 201
 202         return nvecs;
 203 }
 204
 205 /*
 206  * This is called to fill in the vector of log iovecs for the
 207  * given inode log item.  It fills the first item with an inode
 208  * log format structure, the second with the on-disk inode structure,
 209  * and a possible third and/or fourth with the inode data/extents/b-tree
 210  * root and inode attributes data/extents/b-tree root.
 211  */
 212 STATIC void
 213 xfs_inode_item_format(
 214         xfs_inode_log_item_t    *iip,
 215         xfs_log_iovec_t         *log_vector)
 216 {
 217         uint                    nvecs;
 218         xfs_log_iovec_t         *vecp;
 219         xfs_inode_t             *ip;
 220         size_t                  data_bytes;
 221         xfs_bmbt_rec_t          *ext_buffer;
 222         int                     nrecs;
 223         xfs_mount_t             *mp;
 224
 225         ip = iip->ili_inode;
 226         vecp = log_vector;
 227
 228         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
 229         vecp->i_len  = sizeof(xfs_inode_log_format_t);
 230         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
 231         vecp++;
 232         nvecs        = 1;
 233
 234         /*
 235          * Clear i_update_core if the timestamps (or any other
 236          * non-transactional modification) need flushing/logging
 237          * and we're about to log them with the rest of the core.
 238          *
 239          * This is the same logic as xfs_iflush() but this code can't
 240          * run at the same time as xfs_iflush because we're in commit
 241          * processing here and so we have the inode lock held in
 242          * exclusive mode.  Although it doesn't really matter
 243          * for the timestamps if both routines were to grab the
 244          * timestamps or not.  That would be ok.
 245          *
 246          * We clear i_update_core before copying out the data.
 247          * This is for coordination with our timestamp updates
 248          * that don't hold the inode lock. They will always
 249          * update the timestamps BEFORE setting i_update_core,
 250          * so if we clear i_update_core after they set it we
 251          * are guaranteed to see their updates to the timestamps
 252          * either here.  Likewise, if they set it after we clear it
 253          * here, we'll see it either on the next commit of this
 254          * inode or the next time the inode gets flushed via
 255          * xfs_iflush().  This depends on strongly ordered memory
 256          * semantics, but we have that.  We use the SYNCHRONIZE
 257          * macro to make sure that the compiler does not reorder
 258          * the i_update_core access below the data copy below.
 259          */
 260         if (ip->i_update_core)  {
 261                 ip->i_update_core = 0;
 262                 SYNCHRONIZE();
 263         }
 264
 265         /*
 266          * We don't have to worry about re-ordering here because
 267          * the update_size field is protected by the inode lock
 268          * and we have that held in exclusive mode.
 269          */
 270         if (ip->i_update_size)
 271                 ip->i_update_size = 0;
 272
 273         /*
 274          * Make sure to get the latest atime from the Linux inode.
 275          */
 276         xfs_synchronize_atime(ip);
 277
 278         /*
 279          * make sure the linux inode is dirty
 280          */
 281         xfs_mark_inode_dirty_sync(ip);
 282
 283         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
 284         vecp->i_len  = sizeof(xfs_dinode_core_t);
 285         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
 286         vecp++;
 287         nvecs++;
 288         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
 289
 290         /*
 291          * If this is really an old format inode, then we need to
 292          * log it as such.  This means that we have to copy the link
 293          * count from the new field to the old.  We don't have to worry
 294          * about the new fields, because nothing trusts them as long as
 295          * the old inode version number is there.  If the superblock already
 296          * has a new version number, then we don't bother converting back.
 297          */
 298         mp = ip->i_mount;
 299         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
 300                xfs_sb_version_hasnlink(&mp->m_sb));
 301         if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
 302                 if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
 303                         /*
 304                          * Convert it back.
 305                          */
 306                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
 307                         ip->i_d.di_onlink = ip->i_d.di_nlink;
 308                 } else {
 309                         /*
 310                          * The superblock version has already been bumped,
 311                          * so just make the conversion to the new inode
 312                          * format permanent.
 313                          */
 314                         ip->i_d.di_version = XFS_DINODE_VERSION_2;
 315                         ip->i_d.di_onlink = 0;
 316                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
 317                 }
 318         }
 319
 320         switch (ip->i_d.di_format) {
 321         case XFS_DINODE_FMT_EXTENTS:
 322                 ASSERT(!(iip->ili_format.ilf_fields &
 323                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 324                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 325                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
 326                         ASSERT(ip->i_df.if_bytes > 0);
 327                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 328                         ASSERT(ip->i_d.di_nextents > 0);
 329                         ASSERT(iip->ili_extents_buf == NULL);
 330                         nrecs = ip->i_df.if_bytes /
 331                                 (uint)sizeof(xfs_bmbt_rec_t);
 332                         ASSERT(nrecs > 0);
 333 #ifdef XFS_NATIVE_HOST
 334                         if (nrecs == ip->i_d.di_nextents) {
 335                                 /*
 336                                  * There are no delayed allocation
 337                                  * extents, so just point to the
 338                                  * real extents array.
 339                                  */
 340                                 vecp->i_addr =
 341                                         (char *)(ip->i_df.if_u1.if_extents);
 342                                 vecp->i_len = ip->i_df.if_bytes;
 343                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 344                         } else
 345 #endif
 346                         {
 347                                 /*
 348                                  * There are delayed allocation extents
 349                                  * in the inode, or we need to convert
 350                                  * the extents to on disk format.
 351                                  * Use xfs_iextents_copy()
 352                                  * to copy only the real extents into
 353                                  * a separate buffer.  We'll free the
 354                                  * buffer in the unlock routine.
 355                                  */
 356                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
 357                                         KM_SLEEP);
 358                                 iip->ili_extents_buf = ext_buffer;
 359                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
 360                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 361                                                 XFS_DATA_FORK);
 362                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 363                         }
 364                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
 365                         iip->ili_format.ilf_dsize = vecp->i_len;
 366                         vecp++;
 367                         nvecs++;
 368                 }
 369                 break;
 370
 371         case XFS_DINODE_FMT_BTREE:
 372                 ASSERT(!(iip->ili_format.ilf_fields &
 373                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 374                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 375                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
 376                         ASSERT(ip->i_df.if_broot_bytes > 0);
 377                         ASSERT(ip->i_df.if_broot != NULL);
 378                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
 379                         vecp->i_len = ip->i_df.if_broot_bytes;
 380                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
 381                         vecp++;
 382                         nvecs++;
 383                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 384                 }
 385                 break;
 386
 387         case XFS_DINODE_FMT_LOCAL:
 388                 ASSERT(!(iip->ili_format.ilf_fields &
 389                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 390                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 391                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
 392                         ASSERT(ip->i_df.if_bytes > 0);
 393                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 394                         ASSERT(ip->i_d.di_size > 0);
 395
 396                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
 397                         /*
 398                          * Round i_bytes up to a word boundary.
 399                          * The underlying memory is guaranteed to
 400                          * to be there by xfs_idata_realloc().
 401                          */
 402                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 403                         ASSERT((ip->i_df.if_real_bytes == 0) ||
 404                                (ip->i_df.if_real_bytes == data_bytes));
 405                         vecp->i_len = (int)data_bytes;
 406                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
 407                         vecp++;
 408                         nvecs++;
 409                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 410                 }
 411                 break;
 412
 413         case XFS_DINODE_FMT_DEV:
 414                 ASSERT(!(iip->ili_format.ilf_fields &
 415                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 416                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
 417                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
 418                         iip->ili_format.ilf_u.ilfu_rdev =
 419                                 ip->i_df.if_u2.if_rdev;
 420                 }
 421                 break;
 422
 423         case XFS_DINODE_FMT_UUID:
 424                 ASSERT(!(iip->ili_format.ilf_fields &
 425                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 426                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
 427                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
 428                         iip->ili_format.ilf_u.ilfu_uuid =
 429                                 ip->i_df.if_u2.if_uuid;
 430                 }
 431                 break;
 432
 433         default:
 434                 ASSERT(0);
 435                 break;
 436         }
 437
 438         /*
 439          * If there are no attributes associated with the file,
 440          * then we're done.
 441          * Assert that no attribute-related log flags are set.
 442          */
 443         if (!XFS_IFORK_Q(ip)) {
 444                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 445                 iip->ili_format.ilf_size = nvecs;
 446                 ASSERT(!(iip->ili_format.ilf_fields &
 447                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 448                 return;
 449         }
 450
 451         switch (ip->i_d.di_aformat) {
 452         case XFS_DINODE_FMT_EXTENTS:
 453                 ASSERT(!(iip->ili_format.ilf_fields &
 454                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
 455                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
 456                         ASSERT(ip->i_afp->if_bytes > 0);
 457                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 458                         ASSERT(ip->i_d.di_anextents > 0);
 459 #ifdef DEBUG
 460                         nrecs = ip->i_afp->if_bytes /
 461                                 (uint)sizeof(xfs_bmbt_rec_t);
 462 #endif
 463                         ASSERT(nrecs > 0);
 464                         ASSERT(nrecs == ip->i_d.di_anextents);
 465 #ifdef XFS_NATIVE_HOST
 466                         /*
 467                          * There are not delayed allocation extents
 468                          * for attributes, so just point at the array.
 469                          */
 470                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
 471                         vecp->i_len = ip->i_afp->if_bytes;
 472 #else
 473                         ASSERT(iip->ili_aextents_buf == NULL);
 474                         /*
 475                          * Need to endian flip before logging
 476                          */
 477                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
 478                                 KM_SLEEP);
 479                         iip->ili_aextents_buf = ext_buffer;
 480                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
 481                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 482                                         XFS_ATTR_FORK);
 483 #endif
 484                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
 485                         iip->ili_format.ilf_asize = vecp->i_len;
 486                         vecp++;
 487                         nvecs++;
 488                 }
 489                 break;
 490
 491         case XFS_DINODE_FMT_BTREE:
 492                 ASSERT(!(iip->ili_format.ilf_fields &
 493                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
 494                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
 495                         ASSERT(ip->i_afp->if_broot_bytes > 0);
 496                         ASSERT(ip->i_afp->if_broot != NULL);
 497                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
 498                         vecp->i_len = ip->i_afp->if_broot_bytes;
 499                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
 500                         vecp++;
 501                         nvecs++;
 502                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 503                 }
 504                 break;
 505
 506         case XFS_DINODE_FMT_LOCAL:
 507                 ASSERT(!(iip->ili_format.ilf_fields &
 508                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 509                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
 510                         ASSERT(ip->i_afp->if_bytes > 0);
 511                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 512
 513                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
 514                         /*
 515                          * Round i_bytes up to a word boundary.
 516                          * The underlying memory is guaranteed to
 517                          * to be there by xfs_idata_realloc().
 518                          */
 519                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 520                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
 521                                (ip->i_afp->if_real_bytes == data_bytes));
 522                         vecp->i_len = (int)data_bytes;
 523                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
 524                         vecp++;
 525                         nvecs++;
 526                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
 527                 }
 528                 break;
 529
 530         default:
 531                 ASSERT(0);
 532                 break;
 533         }
 534
 535         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 536         iip->ili_format.ilf_size = nvecs;
 537 }
 538
 539
 540 /*
 541  * This is called to pin the inode associated with the inode log
 542  * item in memory so it cannot be written out.  Do this by calling
 543  * xfs_ipin() to bump the pin count in the inode while holding the
 544  * inode pin lock.
 545  */
 546 STATIC void
 547 xfs_inode_item_pin(
 548         xfs_inode_log_item_t    *iip)
 549 {
 550         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
 551         xfs_ipin(iip->ili_inode);
 552 }
 553
 554
 555 /*
 556  * This is called to unpin the inode associated with the inode log
 557  * item which was previously pinned with a call to xfs_inode_item_pin().
 558  * Just call xfs_iunpin() on the inode to do this.
 559  */
 560 /* ARGSUSED */
 561 STATIC void
 562 xfs_inode_item_unpin(
 563         xfs_inode_log_item_t    *iip,
 564         int                     stale)
 565 {
 566         xfs_iunpin(iip->ili_inode);
 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_iunpin(iip->ili_inode);
 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                  * If someone else isn't already trying to push the inode
 610                  * buffer, we get to do it.
 611                  */
 612                 if (iip->ili_pushbuf_flag == 0) {
 613                         iip->ili_pushbuf_flag = 1;
 614 #ifdef DEBUG
 615                         iip->ili_push_owner = current_pid();
 616 #endif
 617                         /*
 618                          * Inode is left locked in shared mode.
 619                          * Pushbuf routine gets to unlock it.
 620                          */
 621                         return XFS_ITEM_PUSHBUF;
 622                 } else {
 623                         /*
 624                          * We hold the AIL lock, so we must specify the
 625                          * NONOTIFY flag so that we won't double trip.
 626                          */
 627                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 628                         return XFS_ITEM_FLUSHING;
 629                 }
 630                 /* NOTREACHED */
 631         }
 632
 633         /* Stale items should force out the iclog */
 634         if (ip->i_flags & XFS_ISTALE) {
 635                 xfs_ifunlock(ip);
 636                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 637                 return XFS_ITEM_PINNED;
 638         }
 639
 640 #ifdef DEBUG
 641         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 642                 ASSERT(iip->ili_format.ilf_fields != 0);
 643                 ASSERT(iip->ili_logged == 0);
 644                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
 645         }
 646 #endif
 647         return XFS_ITEM_SUCCESS;
 648 }
 649
 650 /*
 651  * Unlock the inode associated with the inode log item.
 652  * Clear the fields of the inode and inode log item that
 653  * are specific to the current transaction.  If the
 654  * hold flags is set, do not unlock the inode.
 655  */
 656 STATIC void
 657 xfs_inode_item_unlock(
 658         xfs_inode_log_item_t    *iip)
 659 {
 660         uint            hold;
 661         uint            iolocked;
 662         uint            lock_flags;
 663         xfs_inode_t     *ip;
 664
 665         ASSERT(iip != NULL);
 666         ASSERT(iip->ili_inode->i_itemp != NULL);
 667         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
 668         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 669                   XFS_ILI_IOLOCKED_EXCL)) ||
 670                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_EXCL));
 671         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 672                   XFS_ILI_IOLOCKED_SHARED)) ||
 673                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_SHARED));
 674         /*
 675          * Clear the transaction pointer in the inode.
 676          */
 677         ip = iip->ili_inode;
 678         ip->i_transp = NULL;
 679
 680         /*
 681          * If the inode needed a separate buffer with which to log
 682          * its extents, then free it now.
 683          */
 684         if (iip->ili_extents_buf != NULL) {
 685                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 686                 ASSERT(ip->i_d.di_nextents > 0);
 687                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
 688                 ASSERT(ip->i_df.if_bytes > 0);
 689                 kmem_free(iip->ili_extents_buf);
 690                 iip->ili_extents_buf = NULL;
 691         }
 692         if (iip->ili_aextents_buf != NULL) {
 693                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 694                 ASSERT(ip->i_d.di_anextents > 0);
 695                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
 696                 ASSERT(ip->i_afp->if_bytes > 0);
 697                 kmem_free(iip->ili_aextents_buf);
 698                 iip->ili_aextents_buf = NULL;
 699         }
 700
 701         /*
 702          * Figure out if we should unlock the inode or not.
 703          */
 704         hold = iip->ili_flags & XFS_ILI_HOLD;
 705
 706         /*
 707          * Before clearing out the flags, remember whether we
 708          * are holding the inode's IO lock.
 709          */
 710         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
 711
 712         /*
 713          * Clear out the fields of the inode log item particular
 714          * to the current transaction.
 715          */
 716         iip->ili_ilock_recur = 0;
 717         iip->ili_iolock_recur = 0;
 718         iip->ili_flags = 0;
 719
 720         /*
 721          * Unlock the inode if XFS_ILI_HOLD was not set.
 722          */
 723         if (!hold) {
 724                 lock_flags = XFS_ILOCK_EXCL;
 725                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
 726                         lock_flags |= XFS_IOLOCK_EXCL;
 727                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
 728                         lock_flags |= XFS_IOLOCK_SHARED;
 729                 }
 730                 xfs_iput(iip->ili_inode, lock_flags);
 731         }
 732 }
 733
 734 /*
 735  * This is called to find out where the oldest active copy of the
 736  * inode log item in the on disk log resides now that the last log
 737  * write of it completed at the given lsn.  Since we always re-log
 738  * all dirty data in an inode, the latest copy in the on disk log
 739  * is the only one that matters.  Therefore, simply return the
 740  * given lsn.
 741  */
 742 /*ARGSUSED*/
 743 STATIC xfs_lsn_t
 744 xfs_inode_item_committed(
 745         xfs_inode_log_item_t    *iip,
 746         xfs_lsn_t               lsn)
 747 {
 748         return (lsn);
 749 }
 750
 751 /*
 752  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 753  * failed to get the inode flush lock but did get the inode locked SHARED.
 754  * Here we're trying to see if the inode buffer is incore, and if so whether it's
 755  * marked delayed write. If that's the case, we'll initiate a bawrite on that
 756  * buffer to expedite the process.
 757  *
 758  * We aren't holding the AIL lock (or the flush lock) when this gets called,
 759  * so it is inherently race-y.
 760  */
 761 STATIC void
 762 xfs_inode_item_pushbuf(
 763         xfs_inode_log_item_t    *iip)
 764 {
 765         xfs_inode_t     *ip;
 766         xfs_mount_t     *mp;
 767         xfs_buf_t       *bp;
 768         uint            dopush;
 769
 770         ip = iip->ili_inode;
 771
 772         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
 773
 774         /*
 775          * The ili_pushbuf_flag keeps others from
 776          * trying to duplicate our effort.
 777          */
 778         ASSERT(iip->ili_pushbuf_flag != 0);
 779         ASSERT(iip->ili_push_owner == current_pid());
 780
 781         /*
 782          * If a flush is not in progress anymore, chances are that the
 783          * inode was taken off the AIL. So, just get out.
 784          */
 785         if (completion_done(&ip->i_flush) ||
 786             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 787                 iip->ili_pushbuf_flag = 0;
 788                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
 789                 return;
 790         }
 791
 792         mp = ip->i_mount;
 793         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
 794                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
 795
 796         if (bp != NULL) {
 797                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 798                         /*
 799                          * We were racing with iflush because we don't hold
 800                          * the AIL lock or the flush lock. However, at this point,
 801                          * we have the buffer, and we know that it's dirty.
 802                          * So, it's possible that iflush raced with us, and
 803                          * this item is already taken off the AIL.
 804                          * If not, we can flush it async.
 805                          */
 806                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
 807                                   !completion_done(&ip->i_flush));
 808                         iip->ili_pushbuf_flag = 0;
 809                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 810                         xfs_buftrace("INODE ITEM PUSH", bp);
 811                         if (XFS_BUF_ISPINNED(bp)) {
 812                                 xfs_log_force(mp, (xfs_lsn_t)0,
 813                                               XFS_LOG_FORCE);
 814                         }
 815                         if (dopush) {
 816                                 int     error;
 817                                 error = xfs_bawrite(mp, bp);
 818                                 if (error)
 819                                         xfs_fs_cmn_err(CE_WARN, mp,
 820                 "xfs_inode_item_pushbuf: pushbuf error %d on iip %p, bp %p",
 821                                                         error, iip, bp);
 822                         } else {
 823                                 xfs_buf_relse(bp);
 824                         }
 825                 } else {
 826                         iip->ili_pushbuf_flag = 0;
 827                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 828                         xfs_buf_relse(bp);
 829                 }
 830                 return;
 831         }
 832         /*
 833          * We have to be careful about resetting pushbuf flag too early (above).
 834          * Even though in theory we can do it as soon as we have the buflock,
 835          * we don't want others to be doing work needlessly. They'll come to
 836          * this function thinking that pushing the buffer is their
 837          * responsibility only to find that the buffer is still locked by
 838          * another doing the same thing
 839          */
 840         iip->ili_pushbuf_flag = 0;
 841         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 842         return;
 843 }
 844
 845
 846 /*
 847  * This is called to asynchronously write the inode associated with this
 848  * inode log item out to disk. The inode will already have been locked by
 849  * a successful call to xfs_inode_item_trylock().
 850  */
 851 STATIC void
 852 xfs_inode_item_push(
 853         xfs_inode_log_item_t    *iip)
 854 {
 855         xfs_inode_t     *ip;
 856
 857         ip = iip->ili_inode;
 858
 859         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
 860         ASSERT(!completion_done(&ip->i_flush));
 861         /*
 862          * Since we were able to lock the inode's flush lock and
 863          * we found it on the AIL, the inode must be dirty.  This
 864          * is because the inode is removed from the AIL while still
 865          * holding the flush lock in xfs_iflush_done().  Thus, if
 866          * we found it in the AIL and were able to obtain the flush
 867          * lock without sleeping, then there must not have been
 868          * anyone in the process of flushing the inode.
 869          */
 870         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
 871                iip->ili_format.ilf_fields != 0);
 872
 873         /*
 874          * Write out the inode.  The completion routine ('iflush_done') will
 875          * pull it from the AIL, mark it clean, unlock the flush lock.
 876          */
 877         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
 878         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 879
 880         return;
 881 }
 882
 883 /*
 884  * XXX rcc - this one really has to do something.  Probably needs
 885  * to stamp in a new field in the incore inode.
 886  */
 887 /* ARGSUSED */
 888 STATIC void
 889 xfs_inode_item_committing(
 890         xfs_inode_log_item_t    *iip,
 891         xfs_lsn_t               lsn)
 892 {
 893         iip->ili_last_lsn = lsn;
 894         return;
 895 }
 896
 897 /*
 898  * This is the ops vector shared by all buf log items.
 899  */
 900 static struct xfs_item_ops xfs_inode_item_ops = {
 901         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
 902         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 903                                         xfs_inode_item_format,
 904         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
 905         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
 906         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 907                                         xfs_inode_item_unpin_remove,
 908         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
 909         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
 910         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 911                                         xfs_inode_item_committed,
 912         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
 913         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
 914         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 915                                         xfs_inode_item_committing
 916 };
 917
 918
 919 /*
 920  * Initialize the inode log item for a newly allocated (in-core) inode.
 921  */
 922 void
 923 xfs_inode_item_init(
 924         xfs_inode_t     *ip,
 925         xfs_mount_t     *mp)
 926 {
 927         xfs_inode_log_item_t    *iip;
 928
 929         ASSERT(ip->i_itemp == NULL);
 930         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 931
 932         iip->ili_item.li_type = XFS_LI_INODE;
 933         iip->ili_item.li_ops = &xfs_inode_item_ops;
 934         iip->ili_item.li_mountp = mp;
 935         iip->ili_inode = ip;
 936
 937         /*
 938            We have zeroed memory. No need ...
 939            iip->ili_extents_buf = NULL;
 940            iip->ili_pushbuf_flag = 0;
 941          */
 942
 943         iip->ili_format.ilf_type = XFS_LI_INODE;
 944         iip->ili_format.ilf_ino = ip->i_ino;
 945         iip->ili_format.ilf_blkno = ip->i_blkno;
 946         iip->ili_format.ilf_len = ip->i_len;
 947         iip->ili_format.ilf_boffset = ip->i_boffset;
 948 }
 949
 950 /*
 951  * Free the inode log item and any memory hanging off of it.
 952  */
 953 void
 954 xfs_inode_item_destroy(
 955         xfs_inode_t     *ip)
 956 {
 957 #ifdef XFS_TRANS_DEBUG
 958         if (ip->i_itemp->ili_root_size != 0) {
 959                 kmem_free(ip->i_itemp->ili_orig_root);
 960         }
 961 #endif
 962         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 963 }
 964
 965
 966 /*
 967  * This is the inode flushing I/O completion routine.  It is called
 968  * from interrupt level when the buffer containing the inode is
 969  * flushed to disk.  It is responsible for removing the inode item
 970  * from the AIL if it has not been re-logged, and unlocking the inode's
 971  * flush lock.
 972  */
 973 /*ARGSUSED*/
 974 void
 975 xfs_iflush_done(
 976         xfs_buf_t               *bp,
 977         xfs_inode_log_item_t    *iip)
 978 {
 979         xfs_inode_t     *ip;
 980
 981         ip = iip->ili_inode;
 982
 983         /*
 984          * We only want to pull the item from the AIL if it is
 985          * actually there and its location in the log has not
 986          * changed since we started the flush.  Thus, we only bother
 987          * if the ili_logged flag is set and the inode's lsn has not
 988          * changed.  First we check the lsn outside
 989          * the lock since it's cheaper, and then we recheck while
 990          * holding the lock before removing the inode from the AIL.
 991          */
 992         if (iip->ili_logged &&
 993             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
 994                 spin_lock(&ip->i_mount->m_ail_lock);
 995                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
 996                         /*
 997                          * xfs_trans_delete_ail() drops the AIL lock.
 998                          */
 999                         xfs_trans_delete_ail(ip->i_mount,
1000                                              (xfs_log_item_t*)iip);
1001                 } else {
1002                         spin_unlock(&ip->i_mount->m_ail_lock);
1003                 }
1004         }
1005
1006         iip->ili_logged = 0;
1007
1008         /*
1009          * Clear the ili_last_fields bits now that we know that the
1010          * data corresponding to them is safely on disk.
1011          */
1012         iip->ili_last_fields = 0;
1013
1014         /*
1015          * Release the inode's flush lock since we're done with it.
1016          */
1017         xfs_ifunlock(ip);
1018
1019         return;
1020 }
1021
1022 /*
1023  * This is the inode flushing abort routine.  It is called
1024  * from xfs_iflush when the filesystem is shutting down to clean
1025  * up the inode state.
1026  * It is responsible for removing the inode item
1027  * from the AIL if it has not been re-logged, and unlocking the inode's
1028  * flush lock.
1029  */
1030 void
1031 xfs_iflush_abort(
1032         xfs_inode_t             *ip)
1033 {
1034         xfs_inode_log_item_t    *iip;
1035         xfs_mount_t             *mp;
1036
1037         iip = ip->i_itemp;
1038         mp = ip->i_mount;
1039         if (iip) {
1040                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1041                         spin_lock(&mp->m_ail_lock);
1042                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1043                                 /*
1044                                  * xfs_trans_delete_ail() drops the AIL lock.
1045                                  */
1046                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip);
1047                         } else
1048                                 spin_unlock(&mp->m_ail_lock);
1049                 }
1050                 iip->ili_logged = 0;
1051                 /*
1052                  * Clear the ili_last_fields bits now that we know that the
1053                  * data corresponding to them is safely on disk.
1054                  */
1055                 iip->ili_last_fields = 0;
1056                 /*
1057                  * Clear the inode logging fields so no more flushes are
1058                  * attempted.
1059                  */
1060                 iip->ili_format.ilf_fields = 0;
1061         }
1062         /*
1063          * Release the inode's flush lock since we're done with it.
1064          */
1065         xfs_ifunlock(ip);
1066 }
1067
1068 void
1069 xfs_istale_done(
1070         xfs_buf_t               *bp,
1071         xfs_inode_log_item_t    *iip)
1072 {
1073         xfs_iflush_abort(iip->ili_inode);
1074 }
1075
1076 /*
1077  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
1078  * (which can have different field alignments) to the native version
1079  */
1080 int
1081 xfs_inode_item_format_convert(
1082         xfs_log_iovec_t         *buf,
1083         xfs_inode_log_format_t  *in_f)
1084 {
1085         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
1086                 xfs_inode_log_format_32_t *in_f32;
1087
1088                 in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
1089                 in_f->ilf_type = in_f32->ilf_type;
1090                 in_f->ilf_size = in_f32->ilf_size;
1091                 in_f->ilf_fields = in_f32->ilf_fields;
1092                 in_f->ilf_asize = in_f32->ilf_asize;
1093                 in_f->ilf_dsize = in_f32->ilf_dsize;
1094                 in_f->ilf_ino = in_f32->ilf_ino;
1095                 /* copy biggest field of ilf_u */
1096                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1097                        in_f32->ilf_u.ilfu_uuid.__u_bits,
1098                        sizeof(uuid_t));
1099                 in_f->ilf_blkno = in_f32->ilf_blkno;
1100                 in_f->ilf_len = in_f32->ilf_len;
1101                 in_f->ilf_boffset = in_f32->ilf_boffset;
1102                 return 0;
1103         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
1104                 xfs_inode_log_format_64_t *in_f64;
1105
1106                 in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
1107                 in_f->ilf_type = in_f64->ilf_type;
1108                 in_f->ilf_size = in_f64->ilf_size;
1109                 in_f->ilf_fields = in_f64->ilf_fields;
1110                 in_f->ilf_asize = in_f64->ilf_asize;
1111                 in_f->ilf_dsize = in_f64->ilf_dsize;
1112                 in_f->ilf_ino = in_f64->ilf_ino;
1113                 /* copy biggest field of ilf_u */
1114                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1115                        in_f64->ilf_u.ilfu_uuid.__u_bits,
1116                        sizeof(uuid_t));
1117                 in_f->ilf_blkno = in_f64->ilf_blkno;
1118                 in_f->ilf_len = in_f64->ilf_len;
1119                 in_f->ilf_boffset = in_f64->ilf_boffset;
1120                 return 0;
1121         }
1122         return EFSCORRUPTED;
1123 }