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
  44
  45 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  46
  47 /*
  48  * This returns the number of iovecs needed to log the given inode item.
  49  *
  50  * We need one iovec for the inode log format structure, one for the
  51  * inode core, and possibly one for the inode data/extents/b-tree root
  52  * and one for the inode attribute data/extents/b-tree root.
  53  */
  54 STATIC uint
  55 xfs_inode_item_size(
  56         xfs_inode_log_item_t    *iip)
  57 {
  58         uint            nvecs;
  59         xfs_inode_t     *ip;
  60
  61         ip = iip->ili_inode;
  62         nvecs = 2;
  63
  64         /*
  65          * Only log the data/extents/b-tree root if there is something
  66          * left to log.
  67          */
  68         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  69
  70         switch (ip->i_d.di_format) {
  71         case XFS_DINODE_FMT_EXTENTS:
  72                 iip->ili_format.ilf_fields &=
  73                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  74                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  75                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
  76                     (ip->i_d.di_nextents > 0) &&
  77                     (ip->i_df.if_bytes > 0)) {
  78                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
  79                         nvecs++;
  80                 } else {
  81                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
  82                 }
  83                 break;
  84
  85         case XFS_DINODE_FMT_BTREE:
  86                 ASSERT(ip->i_df.if_ext_max ==
  87                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
  88                 iip->ili_format.ilf_fields &=
  89                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
  90                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  91                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
  92                     (ip->i_df.if_broot_bytes > 0)) {
  93                         ASSERT(ip->i_df.if_broot != NULL);
  94                         nvecs++;
  95                 } else {
  96                         ASSERT(!(iip->ili_format.ilf_fields &
  97                                  XFS_ILOG_DBROOT));
  98 #ifdef XFS_TRANS_DEBUG
  99                         if (iip->ili_root_size > 0) {
 100                                 ASSERT(iip->ili_root_size ==
 101                                        ip->i_df.if_broot_bytes);
 102                                 ASSERT(memcmp(iip->ili_orig_root,
 103                                             ip->i_df.if_broot,
 104                                             iip->ili_root_size) == 0);
 105                         } else {
 106                                 ASSERT(ip->i_df.if_broot_bytes == 0);
 107                         }
 108 #endif
 109                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
 110                 }
 111                 break;
 112
 113         case XFS_DINODE_FMT_LOCAL:
 114                 iip->ili_format.ilf_fields &=
 115                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 116                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 117                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
 118                     (ip->i_df.if_bytes > 0)) {
 119                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 120                         ASSERT(ip->i_d.di_size > 0);
 121                         nvecs++;
 122                 } else {
 123                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
 124                 }
 125                 break;
 126
 127         case XFS_DINODE_FMT_DEV:
 128                 iip->ili_format.ilf_fields &=
 129                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 130                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 131                 break;
 132
 133         case XFS_DINODE_FMT_UUID:
 134                 iip->ili_format.ilf_fields &=
 135                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 136                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 137                 break;
 138
 139         default:
 140                 ASSERT(0);
 141                 break;
 142         }
 143
 144         /*
 145          * If there are no attributes associated with this file,
 146          * then there cannot be anything more to log.
 147          * Clear all attribute-related log flags.
 148          */
 149         if (!XFS_IFORK_Q(ip)) {
 150                 iip->ili_format.ilf_fields &=
 151                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 152                 return nvecs;
 153         }
 154
 155         /*
 156          * Log any necessary attribute data.
 157          */
 158         switch (ip->i_d.di_aformat) {
 159         case XFS_DINODE_FMT_EXTENTS:
 160                 iip->ili_format.ilf_fields &=
 161                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 162                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
 163                     (ip->i_d.di_anextents > 0) &&
 164                     (ip->i_afp->if_bytes > 0)) {
 165                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 166                         nvecs++;
 167                 } else {
 168                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
 169                 }
 170                 break;
 171
 172         case XFS_DINODE_FMT_BTREE:
 173                 iip->ili_format.ilf_fields &=
 174                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 175                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
 176                     (ip->i_afp->if_broot_bytes > 0)) {
 177                         ASSERT(ip->i_afp->if_broot != NULL);
 178                         nvecs++;
 179                 } else {
 180                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
 181                 }
 182                 break;
 183
 184         case XFS_DINODE_FMT_LOCAL:
 185                 iip->ili_format.ilf_fields &=
 186                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 187                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
 188                     (ip->i_afp->if_bytes > 0)) {
 189                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 190                         nvecs++;
 191                 } else {
 192                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
 193                 }
 194                 break;
 195
 196         default:
 197                 ASSERT(0);
 198                 break;
 199         }
 200
 201         return nvecs;
 202 }
 203
 204 /*
 205  * This is called to fill in the vector of log iovecs for the
 206  * given inode log item.  It fills the first item with an inode
 207  * log format structure, the second with the on-disk inode structure,
 208  * and a possible third and/or fourth with the inode data/extents/b-tree
 209  * root and inode attributes data/extents/b-tree root.
 210  */
 211 STATIC void
 212 xfs_inode_item_format(
 213         xfs_inode_log_item_t    *iip,
 214         xfs_log_iovec_t         *log_vector)
 215 {
 216         uint                    nvecs;
 217         xfs_log_iovec_t         *vecp;
 218         xfs_inode_t             *ip;
 219         size_t                  data_bytes;
 220         xfs_bmbt_rec_t          *ext_buffer;
 221         int                     nrecs;
 222         xfs_mount_t             *mp;
 223
 224         ip = iip->ili_inode;
 225         vecp = log_vector;
 226
 227         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
 228         vecp->i_len  = sizeof(xfs_inode_log_format_t);
 229         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
 230         vecp++;
 231         nvecs        = 1;
 232
 233         /*
 234          * Clear i_update_core if the timestamps (or any other
 235          * non-transactional modification) need flushing/logging
 236          * and we're about to log them with the rest of the core.
 237          *
 238          * This is the same logic as xfs_iflush() but this code can't
 239          * run at the same time as xfs_iflush because we're in commit
 240          * processing here and so we have the inode lock held in
 241          * exclusive mode.  Although it doesn't really matter
 242          * for the timestamps if both routines were to grab the
 243          * timestamps or not.  That would be ok.
 244          *
 245          * We clear i_update_core before copying out the data.
 246          * This is for coordination with our timestamp updates
 247          * that don't hold the inode lock. They will always
 248          * update the timestamps BEFORE setting i_update_core,
 249          * so if we clear i_update_core after they set it we
 250          * are guaranteed to see their updates to the timestamps
 251          * either here.  Likewise, if they set it after we clear it
 252          * here, we'll see it either on the next commit of this
 253          * inode or the next time the inode gets flushed via
 254          * xfs_iflush().  This depends on strongly ordered memory
 255          * semantics, but we have that.  We use the SYNCHRONIZE
 256          * macro to make sure that the compiler does not reorder
 257          * the i_update_core access below the data copy below.
 258          */
 259         if (ip->i_update_core)  {
 260                 ip->i_update_core = 0;
 261                 SYNCHRONIZE();
 262         }
 263
 264         /*
 265          * We don't have to worry about re-ordering here because
 266          * the update_size field is protected by the inode lock
 267          * and we have that held in exclusive mode.
 268          */
 269         if (ip->i_update_size)
 270                 ip->i_update_size = 0;
 271
 272         /*
 273          * Make sure to get the latest atime from the Linux inode.
 274          */
 275         xfs_synchronize_atime(ip);
 276
 277         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
 278         vecp->i_len  = sizeof(xfs_dinode_core_t);
 279         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
 280         vecp++;
 281         nvecs++;
 282         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
 283
 284         /*
 285          * If this is really an old format inode, then we need to
 286          * log it as such.  This means that we have to copy the link
 287          * count from the new field to the old.  We don't have to worry
 288          * about the new fields, because nothing trusts them as long as
 289          * the old inode version number is there.  If the superblock already
 290          * has a new version number, then we don't bother converting back.
 291          */
 292         mp = ip->i_mount;
 293         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
 294                XFS_SB_VERSION_HASNLINK(&mp->m_sb));
 295         if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
 296                 if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) {
 297                         /*
 298                          * Convert it back.
 299                          */
 300                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
 301                         ip->i_d.di_onlink = ip->i_d.di_nlink;
 302                 } else {
 303                         /*
 304                          * The superblock version has already been bumped,
 305                          * so just make the conversion to the new inode
 306                          * format permanent.
 307                          */
 308                         ip->i_d.di_version = XFS_DINODE_VERSION_2;
 309                         ip->i_d.di_onlink = 0;
 310                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
 311                 }
 312         }
 313
 314         switch (ip->i_d.di_format) {
 315         case XFS_DINODE_FMT_EXTENTS:
 316                 ASSERT(!(iip->ili_format.ilf_fields &
 317                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 318                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 319                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
 320                         ASSERT(ip->i_df.if_bytes > 0);
 321                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 322                         ASSERT(ip->i_d.di_nextents > 0);
 323                         ASSERT(iip->ili_extents_buf == NULL);
 324                         nrecs = ip->i_df.if_bytes /
 325                                 (uint)sizeof(xfs_bmbt_rec_t);
 326                         ASSERT(nrecs > 0);
 327 #ifdef XFS_NATIVE_HOST
 328                         if (nrecs == ip->i_d.di_nextents) {
 329                                 /*
 330                                  * There are no delayed allocation
 331                                  * extents, so just point to the
 332                                  * real extents array.
 333                                  */
 334                                 vecp->i_addr =
 335                                         (char *)(ip->i_df.if_u1.if_extents);
 336                                 vecp->i_len = ip->i_df.if_bytes;
 337                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 338                         } else
 339 #endif
 340                         {
 341                                 /*
 342                                  * There are delayed allocation extents
 343                                  * in the inode, or we need to convert
 344                                  * the extents to on disk format.
 345                                  * Use xfs_iextents_copy()
 346                                  * to copy only the real extents into
 347                                  * a separate buffer.  We'll free the
 348                                  * buffer in the unlock routine.
 349                                  */
 350                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
 351                                         KM_SLEEP);
 352                                 iip->ili_extents_buf = ext_buffer;
 353                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
 354                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 355                                                 XFS_DATA_FORK);
 356                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 357                         }
 358                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
 359                         iip->ili_format.ilf_dsize = vecp->i_len;
 360                         vecp++;
 361                         nvecs++;
 362                 }
 363                 break;
 364
 365         case XFS_DINODE_FMT_BTREE:
 366                 ASSERT(!(iip->ili_format.ilf_fields &
 367                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 368                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 369                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
 370                         ASSERT(ip->i_df.if_broot_bytes > 0);
 371                         ASSERT(ip->i_df.if_broot != NULL);
 372                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
 373                         vecp->i_len = ip->i_df.if_broot_bytes;
 374                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
 375                         vecp++;
 376                         nvecs++;
 377                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 378                 }
 379                 break;
 380
 381         case XFS_DINODE_FMT_LOCAL:
 382                 ASSERT(!(iip->ili_format.ilf_fields &
 383                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 384                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 385                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
 386                         ASSERT(ip->i_df.if_bytes > 0);
 387                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 388                         ASSERT(ip->i_d.di_size > 0);
 389
 390                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
 391                         /*
 392                          * Round i_bytes up to a word boundary.
 393                          * The underlying memory is guaranteed to
 394                          * to be there by xfs_idata_realloc().
 395                          */
 396                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 397                         ASSERT((ip->i_df.if_real_bytes == 0) ||
 398                                (ip->i_df.if_real_bytes == data_bytes));
 399                         vecp->i_len = (int)data_bytes;
 400                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
 401                         vecp++;
 402                         nvecs++;
 403                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 404                 }
 405                 break;
 406
 407         case XFS_DINODE_FMT_DEV:
 408                 ASSERT(!(iip->ili_format.ilf_fields &
 409                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 410                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
 411                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
 412                         iip->ili_format.ilf_u.ilfu_rdev =
 413                                 ip->i_df.if_u2.if_rdev;
 414                 }
 415                 break;
 416
 417         case XFS_DINODE_FMT_UUID:
 418                 ASSERT(!(iip->ili_format.ilf_fields &
 419                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 420                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
 421                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
 422                         iip->ili_format.ilf_u.ilfu_uuid =
 423                                 ip->i_df.if_u2.if_uuid;
 424                 }
 425                 break;
 426
 427         default:
 428                 ASSERT(0);
 429                 break;
 430         }
 431
 432         /*
 433          * If there are no attributes associated with the file,
 434          * then we're done.
 435          * Assert that no attribute-related log flags are set.
 436          */
 437         if (!XFS_IFORK_Q(ip)) {
 438                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 439                 iip->ili_format.ilf_size = nvecs;
 440                 ASSERT(!(iip->ili_format.ilf_fields &
 441                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 442                 return;
 443         }
 444
 445         switch (ip->i_d.di_aformat) {
 446         case XFS_DINODE_FMT_EXTENTS:
 447                 ASSERT(!(iip->ili_format.ilf_fields &
 448                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
 449                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
 450                         ASSERT(ip->i_afp->if_bytes > 0);
 451                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 452                         ASSERT(ip->i_d.di_anextents > 0);
 453 #ifdef DEBUG
 454                         nrecs = ip->i_afp->if_bytes /
 455                                 (uint)sizeof(xfs_bmbt_rec_t);
 456 #endif
 457                         ASSERT(nrecs > 0);
 458                         ASSERT(nrecs == ip->i_d.di_anextents);
 459 #ifdef XFS_NATIVE_HOST
 460                         /*
 461                          * There are not delayed allocation extents
 462                          * for attributes, so just point at the array.
 463                          */
 464                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
 465                         vecp->i_len = ip->i_afp->if_bytes;
 466 #else
 467                         ASSERT(iip->ili_aextents_buf == NULL);
 468                         /*
 469                          * Need to endian flip before logging
 470                          */
 471                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
 472                                 KM_SLEEP);
 473                         iip->ili_aextents_buf = ext_buffer;
 474                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
 475                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 476                                         XFS_ATTR_FORK);
 477 #endif
 478                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
 479                         iip->ili_format.ilf_asize = vecp->i_len;
 480                         vecp++;
 481                         nvecs++;
 482                 }
 483                 break;
 484
 485         case XFS_DINODE_FMT_BTREE:
 486                 ASSERT(!(iip->ili_format.ilf_fields &
 487                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
 488                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
 489                         ASSERT(ip->i_afp->if_broot_bytes > 0);
 490                         ASSERT(ip->i_afp->if_broot != NULL);
 491                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
 492                         vecp->i_len = ip->i_afp->if_broot_bytes;
 493                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
 494                         vecp++;
 495                         nvecs++;
 496                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 497                 }
 498                 break;
 499
 500         case XFS_DINODE_FMT_LOCAL:
 501                 ASSERT(!(iip->ili_format.ilf_fields &
 502                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 503                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
 504                         ASSERT(ip->i_afp->if_bytes > 0);
 505                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 506
 507                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
 508                         /*
 509                          * Round i_bytes up to a word boundary.
 510                          * The underlying memory is guaranteed to
 511                          * to be there by xfs_idata_realloc().
 512                          */
 513                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 514                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
 515                                (ip->i_afp->if_real_bytes == data_bytes));
 516                         vecp->i_len = (int)data_bytes;
 517                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
 518                         vecp++;
 519                         nvecs++;
 520                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
 521                 }
 522                 break;
 523
 524         default:
 525                 ASSERT(0);
 526                 break;
 527         }
 528
 529         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 530         iip->ili_format.ilf_size = nvecs;
 531 }
 532
 533
 534 /*
 535  * This is called to pin the inode associated with the inode log
 536  * item in memory so it cannot be written out.  Do this by calling
 537  * xfs_ipin() to bump the pin count in the inode while holding the
 538  * inode pin lock.
 539  */
 540 STATIC void
 541 xfs_inode_item_pin(
 542         xfs_inode_log_item_t    *iip)
 543 {
 544         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 545         xfs_ipin(iip->ili_inode);
 546 }
 547
 548
 549 /*
 550  * This is called to unpin the inode associated with the inode log
 551  * item which was previously pinned with a call to xfs_inode_item_pin().
 552  * Just call xfs_iunpin() on the inode to do this.
 553  */
 554 /* ARGSUSED */
 555 STATIC void
 556 xfs_inode_item_unpin(
 557         xfs_inode_log_item_t    *iip,
 558         int                     stale)
 559 {
 560         xfs_iunpin(iip->ili_inode);
 561 }
 562
 563 /* ARGSUSED */
 564 STATIC void
 565 xfs_inode_item_unpin_remove(
 566         xfs_inode_log_item_t    *iip,
 567         xfs_trans_t             *tp)
 568 {
 569         xfs_iunpin(iip->ili_inode);
 570 }
 571
 572 /*
 573  * This is called to attempt to lock the inode associated with this
 574  * inode log item, in preparation for the push routine which does the actual
 575  * iflush.  Don't sleep on the inode lock or the flush lock.
 576  *
 577  * If the flush lock is already held, indicating that the inode has
 578  * been or is in the process of being flushed, then (ideally) we'd like to
 579  * see if the inode's buffer is still incore, and if so give it a nudge.
 580  * We delay doing so until the pushbuf routine, though, to avoid holding
 581  * the AIL lock across a call to the blackhole which is the buffer cache.
 582  * Also we don't want to sleep in any device strategy routines, which can happen
 583  * if we do the subsequent bawrite in here.
 584  */
 585 STATIC uint
 586 xfs_inode_item_trylock(
 587         xfs_inode_log_item_t    *iip)
 588 {
 589         register xfs_inode_t    *ip;
 590
 591         ip = iip->ili_inode;
 592
 593         if (xfs_ipincount(ip) > 0) {
 594                 return XFS_ITEM_PINNED;
 595         }
 596
 597         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
 598                 return XFS_ITEM_LOCKED;
 599         }
 600
 601         if (!xfs_iflock_nowait(ip)) {
 602                 /*
 603                  * If someone else isn't already trying to push the inode
 604                  * buffer, we get to do it.
 605                  */
 606                 if (iip->ili_pushbuf_flag == 0) {
 607                         iip->ili_pushbuf_flag = 1;
 608 #ifdef DEBUG
 609                         iip->ili_push_owner = current_pid();
 610 #endif
 611                         /*
 612                          * Inode is left locked in shared mode.
 613                          * Pushbuf routine gets to unlock it.
 614                          */
 615                         return XFS_ITEM_PUSHBUF;
 616                 } else {
 617                         /*
 618                          * We hold the AIL_LOCK, so we must specify the
 619                          * NONOTIFY flag so that we won't double trip.
 620                          */
 621                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 622                         return XFS_ITEM_FLUSHING;
 623                 }
 624                 /* NOTREACHED */
 625         }
 626
 627         /* Stale items should force out the iclog */
 628         if (ip->i_flags & XFS_ISTALE) {
 629                 xfs_ifunlock(ip);
 630                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 631                 return XFS_ITEM_PINNED;
 632         }
 633
 634 #ifdef DEBUG
 635         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 636                 ASSERT(iip->ili_format.ilf_fields != 0);
 637                 ASSERT(iip->ili_logged == 0);
 638                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
 639         }
 640 #endif
 641         return XFS_ITEM_SUCCESS;
 642 }
 643
 644 /*
 645  * Unlock the inode associated with the inode log item.
 646  * Clear the fields of the inode and inode log item that
 647  * are specific to the current transaction.  If the
 648  * hold flags is set, do not unlock the inode.
 649  */
 650 STATIC void
 651 xfs_inode_item_unlock(
 652         xfs_inode_log_item_t    *iip)
 653 {
 654         uint            hold;
 655         uint            iolocked;
 656         uint            lock_flags;
 657         xfs_inode_t     *ip;
 658
 659         ASSERT(iip != NULL);
 660         ASSERT(iip->ili_inode->i_itemp != NULL);
 661         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 662         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 663                   XFS_ILI_IOLOCKED_EXCL)) ||
 664                ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
 665         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 666                   XFS_ILI_IOLOCKED_SHARED)) ||
 667                ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
 668         /*
 669          * Clear the transaction pointer in the inode.
 670          */
 671         ip = iip->ili_inode;
 672         ip->i_transp = NULL;
 673
 674         /*
 675          * If the inode needed a separate buffer with which to log
 676          * its extents, then free it now.
 677          */
 678         if (iip->ili_extents_buf != NULL) {
 679                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 680                 ASSERT(ip->i_d.di_nextents > 0);
 681                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
 682                 ASSERT(ip->i_df.if_bytes > 0);
 683                 kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
 684                 iip->ili_extents_buf = NULL;
 685         }
 686         if (iip->ili_aextents_buf != NULL) {
 687                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 688                 ASSERT(ip->i_d.di_anextents > 0);
 689                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
 690                 ASSERT(ip->i_afp->if_bytes > 0);
 691                 kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
 692                 iip->ili_aextents_buf = NULL;
 693         }
 694
 695         /*
 696          * Figure out if we should unlock the inode or not.
 697          */
 698         hold = iip->ili_flags & XFS_ILI_HOLD;
 699
 700         /*
 701          * Before clearing out the flags, remember whether we
 702          * are holding the inode's IO lock.
 703          */
 704         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
 705
 706         /*
 707          * Clear out the fields of the inode log item particular
 708          * to the current transaction.
 709          */
 710         iip->ili_ilock_recur = 0;
 711         iip->ili_iolock_recur = 0;
 712         iip->ili_flags = 0;
 713
 714         /*
 715          * Unlock the inode if XFS_ILI_HOLD was not set.
 716          */
 717         if (!hold) {
 718                 lock_flags = XFS_ILOCK_EXCL;
 719                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
 720                         lock_flags |= XFS_IOLOCK_EXCL;
 721                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
 722                         lock_flags |= XFS_IOLOCK_SHARED;
 723                 }
 724                 xfs_iput(iip->ili_inode, lock_flags);
 725         }
 726 }
 727
 728 /*
 729  * This is called to find out where the oldest active copy of the
 730  * inode log item in the on disk log resides now that the last log
 731  * write of it completed at the given lsn.  Since we always re-log
 732  * all dirty data in an inode, the latest copy in the on disk log
 733  * is the only one that matters.  Therefore, simply return the
 734  * given lsn.
 735  */
 736 /*ARGSUSED*/
 737 STATIC xfs_lsn_t
 738 xfs_inode_item_committed(
 739         xfs_inode_log_item_t    *iip,
 740         xfs_lsn_t               lsn)
 741 {
 742         return (lsn);
 743 }
 744
 745 /*
 746  * The transaction with the inode locked has aborted.  The inode
 747  * must not be dirty within the transaction (unless we're forcibly
 748  * shutting down).  We simply unlock just as if the transaction
 749  * had been cancelled.
 750  */
 751 STATIC void
 752 xfs_inode_item_abort(
 753         xfs_inode_log_item_t    *iip)
 754 {
 755         xfs_inode_item_unlock(iip);
 756         return;
 757 }
 758
 759
 760 /*
 761  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 762  * failed to get the inode flush lock but did get the inode locked SHARED.
 763  * Here we're trying to see if the inode buffer is incore, and if so whether it's
 764  * marked delayed write. If that's the case, we'll initiate a bawrite on that
 765  * buffer to expedite the process.
 766  *
 767  * We aren't holding the AIL_LOCK (or the flush lock) when this gets called,
 768  * so it is inherently race-y.
 769  */
 770 STATIC void
 771 xfs_inode_item_pushbuf(
 772         xfs_inode_log_item_t    *iip)
 773 {
 774         xfs_inode_t     *ip;
 775         xfs_mount_t     *mp;
 776         xfs_buf_t       *bp;
 777         uint            dopush;
 778
 779         ip = iip->ili_inode;
 780
 781         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 782
 783         /*
 784          * The ili_pushbuf_flag keeps others from
 785          * trying to duplicate our effort.
 786          */
 787         ASSERT(iip->ili_pushbuf_flag != 0);
 788         ASSERT(iip->ili_push_owner == current_pid());
 789
 790         /*
 791          * If flushlock isn't locked anymore, chances are that the
 792          * inode flush completed and the inode was taken off the AIL.
 793          * So, just get out.
 794          */
 795         if (!issemalocked(&(ip->i_flock)) ||
 796             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 797                 iip->ili_pushbuf_flag = 0;
 798                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
 799                 return;
 800         }
 801
 802         mp = ip->i_mount;
 803         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
 804                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
 805
 806         if (bp != NULL) {
 807                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 808                         /*
 809                          * We were racing with iflush because we don't hold
 810                          * the AIL_LOCK or the flush lock. However, at this point,
 811                          * we have the buffer, and we know that it's dirty.
 812                          * So, it's possible that iflush raced with us, and
 813                          * this item is already taken off the AIL.
 814                          * If not, we can flush it async.
 815                          */
 816                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
 817                                   issemalocked(&(ip->i_flock)));
 818                         iip->ili_pushbuf_flag = 0;
 819                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 820                         xfs_buftrace("INODE ITEM PUSH", bp);
 821                         if (XFS_BUF_ISPINNED(bp)) {
 822                                 xfs_log_force(mp, (xfs_lsn_t)0,
 823                                               XFS_LOG_FORCE);
 824                         }
 825                         if (dopush) {
 826                                 xfs_bawrite(mp, bp);
 827                         } else {
 828                                 xfs_buf_relse(bp);
 829                         }
 830                 } else {
 831                         iip->ili_pushbuf_flag = 0;
 832                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 833                         xfs_buf_relse(bp);
 834                 }
 835                 return;
 836         }
 837         /*
 838          * We have to be careful about resetting pushbuf flag too early (above).
 839          * Even though in theory we can do it as soon as we have the buflock,
 840          * we don't want others to be doing work needlessly. They'll come to
 841          * this function thinking that pushing the buffer is their
 842          * responsibility only to find that the buffer is still locked by
 843          * another doing the same thing
 844          */
 845         iip->ili_pushbuf_flag = 0;
 846         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 847         return;
 848 }
 849
 850
 851 /*
 852  * This is called to asynchronously write the inode associated with this
 853  * inode log item out to disk. The inode will already have been locked by
 854  * a successful call to xfs_inode_item_trylock().
 855  */
 856 STATIC void
 857 xfs_inode_item_push(
 858         xfs_inode_log_item_t    *iip)
 859 {
 860         xfs_inode_t     *ip;
 861
 862         ip = iip->ili_inode;
 863
 864         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 865         ASSERT(issemalocked(&(ip->i_flock)));
 866         /*
 867          * Since we were able to lock the inode's flush lock and
 868          * we found it on the AIL, the inode must be dirty.  This
 869          * is because the inode is removed from the AIL while still
 870          * holding the flush lock in xfs_iflush_done().  Thus, if
 871          * we found it in the AIL and were able to obtain the flush
 872          * lock without sleeping, then there must not have been
 873          * anyone in the process of flushing the inode.
 874          */
 875         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
 876                iip->ili_format.ilf_fields != 0);
 877
 878         /*
 879          * Write out the inode.  The completion routine ('iflush_done') will
 880          * pull it from the AIL, mark it clean, unlock the flush lock.
 881          */
 882         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
 883         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 884
 885         return;
 886 }
 887
 888 /*
 889  * XXX rcc - this one really has to do something.  Probably needs
 890  * to stamp in a new field in the incore inode.
 891  */
 892 /* ARGSUSED */
 893 STATIC void
 894 xfs_inode_item_committing(
 895         xfs_inode_log_item_t    *iip,
 896         xfs_lsn_t               lsn)
 897 {
 898         iip->ili_last_lsn = lsn;
 899         return;
 900 }
 901
 902 /*
 903  * This is the ops vector shared by all buf log items.
 904  */
 905 STATIC struct xfs_item_ops xfs_inode_item_ops = {
 906         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
 907         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 908                                         xfs_inode_item_format,
 909         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
 910         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
 911         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 912                                         xfs_inode_item_unpin_remove,
 913         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
 914         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
 915         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 916                                         xfs_inode_item_committed,
 917         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
 918         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_inode_item_abort,
 919         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
 920         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 921                                         xfs_inode_item_committing
 922 };
 923
 924
 925 /*
 926  * Initialize the inode log item for a newly allocated (in-core) inode.
 927  */
 928 void
 929 xfs_inode_item_init(
 930         xfs_inode_t     *ip,
 931         xfs_mount_t     *mp)
 932 {
 933         xfs_inode_log_item_t    *iip;
 934
 935         ASSERT(ip->i_itemp == NULL);
 936         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 937
 938         iip->ili_item.li_type = XFS_LI_INODE;
 939         iip->ili_item.li_ops = &xfs_inode_item_ops;
 940         iip->ili_item.li_mountp = mp;
 941         iip->ili_inode = ip;
 942
 943         /*
 944            We have zeroed memory. No need ...
 945            iip->ili_extents_buf = NULL;
 946            iip->ili_pushbuf_flag = 0;
 947          */
 948
 949         iip->ili_format.ilf_type = XFS_LI_INODE;
 950         iip->ili_format.ilf_ino = ip->i_ino;
 951         iip->ili_format.ilf_blkno = ip->i_blkno;
 952         iip->ili_format.ilf_len = ip->i_len;
 953         iip->ili_format.ilf_boffset = ip->i_boffset;
 954 }
 955
 956 /*
 957  * Free the inode log item and any memory hanging off of it.
 958  */
 959 void
 960 xfs_inode_item_destroy(
 961         xfs_inode_t     *ip)
 962 {
 963 #ifdef XFS_TRANS_DEBUG
 964         if (ip->i_itemp->ili_root_size != 0) {
 965                 kmem_free(ip->i_itemp->ili_orig_root,
 966                           ip->i_itemp->ili_root_size);
 967         }
 968 #endif
 969         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 970 }
 971
 972
 973 /*
 974  * This is the inode flushing I/O completion routine.  It is called
 975  * from interrupt level when the buffer containing the inode is
 976  * flushed to disk.  It is responsible for removing the inode item
 977  * from the AIL if it has not been re-logged, and unlocking the inode's
 978  * flush lock.
 979  */
 980 /*ARGSUSED*/
 981 void
 982 xfs_iflush_done(
 983         xfs_buf_t               *bp,
 984         xfs_inode_log_item_t    *iip)
 985 {
 986         xfs_inode_t     *ip;
 987         SPLDECL(s);
 988
 989         ip = iip->ili_inode;
 990
 991         /*
 992          * We only want to pull the item from the AIL if it is
 993          * actually there and its location in the log has not
 994          * changed since we started the flush.  Thus, we only bother
 995          * if the ili_logged flag is set and the inode's lsn has not
 996          * changed.  First we check the lsn outside
 997          * the lock since it's cheaper, and then we recheck while
 998          * holding the lock before removing the inode from the AIL.
 999          */
1000         if (iip->ili_logged &&
1001             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
1002                 AIL_LOCK(ip->i_mount, s);
1003                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
1004                         /*
1005                          * xfs_trans_delete_ail() drops the AIL lock.
1006                          */
1007                         xfs_trans_delete_ail(ip->i_mount,
1008                                              (xfs_log_item_t*)iip, s);
1009                 } else {
1010                         AIL_UNLOCK(ip->i_mount, s);
1011                 }
1012         }
1013
1014         iip->ili_logged = 0;
1015
1016         /*
1017          * Clear the ili_last_fields bits now that we know that the
1018          * data corresponding to them is safely on disk.
1019          */
1020         iip->ili_last_fields = 0;
1021
1022         /*
1023          * Release the inode's flush lock since we're done with it.
1024          */
1025         xfs_ifunlock(ip);
1026
1027         return;
1028 }
1029
1030 /*
1031  * This is the inode flushing abort routine.  It is called
1032  * from xfs_iflush when the filesystem is shutting down to clean
1033  * up the inode state.
1034  * It is responsible for removing the inode item
1035  * from the AIL if it has not been re-logged, and unlocking the inode's
1036  * flush lock.
1037  */
1038 void
1039 xfs_iflush_abort(
1040         xfs_inode_t             *ip)
1041 {
1042         xfs_inode_log_item_t    *iip;
1043         xfs_mount_t             *mp;
1044         SPLDECL(s);
1045
1046         iip = ip->i_itemp;
1047         mp = ip->i_mount;
1048         if (iip) {
1049                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1050                         AIL_LOCK(mp, s);
1051                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1052                                 /*
1053                                  * xfs_trans_delete_ail() drops the AIL lock.
1054                                  */
1055                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
1056                                         s);
1057                         } else
1058                                 AIL_UNLOCK(mp, s);
1059                 }
1060                 iip->ili_logged = 0;
1061                 /*
1062                  * Clear the ili_last_fields bits now that we know that the
1063                  * data corresponding to them is safely on disk.
1064                  */
1065                 iip->ili_last_fields = 0;
1066                 /*
1067                  * Clear the inode logging fields so no more flushes are
1068                  * attempted.
1069                  */
1070                 iip->ili_format.ilf_fields = 0;
1071         }
1072         /*
1073          * Release the inode's flush lock since we're done with it.
1074          */
1075         xfs_ifunlock(ip);
1076 }
1077
1078 void
1079 xfs_istale_done(
1080         xfs_buf_t               *bp,
1081         xfs_inode_log_item_t    *iip)
1082 {
1083         xfs_iflush_abort(iip->ili_inode);
1084 }
1085
1086 /*
1087  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
1088  * (which can have different field alignments) to the native version
1089  */
1090 int
1091 xfs_inode_item_format_convert(
1092         xfs_log_iovec_t         *buf,
1093         xfs_inode_log_format_t  *in_f)
1094 {
1095         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
1096                 xfs_inode_log_format_32_t *in_f32;
1097
1098                 in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
1099                 in_f->ilf_type = in_f32->ilf_type;
1100                 in_f->ilf_size = in_f32->ilf_size;
1101                 in_f->ilf_fields = in_f32->ilf_fields;
1102                 in_f->ilf_asize = in_f32->ilf_asize;
1103                 in_f->ilf_dsize = in_f32->ilf_dsize;
1104                 in_f->ilf_ino = in_f32->ilf_ino;
1105                 /* copy biggest field of ilf_u */
1106                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1107                        in_f32->ilf_u.ilfu_uuid.__u_bits,
1108                        sizeof(uuid_t));
1109                 in_f->ilf_blkno = in_f32->ilf_blkno;
1110                 in_f->ilf_len = in_f32->ilf_len;
1111                 in_f->ilf_boffset = in_f32->ilf_boffset;
1112                 return 0;
1113         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
1114                 xfs_inode_log_format_64_t *in_f64;
1115
1116                 in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
1117                 in_f->ilf_type = in_f64->ilf_type;
1118                 in_f->ilf_size = in_f64->ilf_size;
1119                 in_f->ilf_fields = in_f64->ilf_fields;
1120                 in_f->ilf_asize = in_f64->ilf_asize;
1121                 in_f->ilf_dsize = in_f64->ilf_dsize;
1122                 in_f->ilf_ino = in_f64->ilf_ino;
1123                 /* copy biggest field of ilf_u */
1124                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1125                        in_f64->ilf_u.ilfu_uuid.__u_bits,
1126                        sizeof(uuid_t));
1127                 in_f->ilf_blkno = in_f64->ilf_blkno;
1128                 in_f->ilf_len = in_f64->ilf_len;
1129                 in_f->ilf_boffset = in_f64->ilf_boffset;
1130                 return 0;
1131         }
1132         return EFSCORRUPTED;
1133 }