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