SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/xfs/xfs_inode_item.c

   1 /*
   2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms of version 2 of the GNU General Public License as
   6  * published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it would be useful, but
   9  * WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  11  *
  12  * Further, this software is distributed without any warranty that it is
  13  * free of the rightful claim of any third person regarding infringement
  14  * or the like.  Any license provided herein, whether implied or
  15  * otherwise, applies only to this software file.  Patent licenses, if
  16  * any, provided herein do not apply to combinations of this program with
  17  * other software, or any other product whatsoever.
  18  *
  19  * You should have received a copy of the GNU General Public License along
  20  * with this program; if not, write the Free Software Foundation, Inc., 59
  21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
  22  *
  23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
  24  * Mountain View, CA  94043, or:
  25  *
  26  * http://www.sgi.com
  27  *
  28  * For further information regarding this notice, see:
  29  *
  30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
  31  */
  32
  33 /*
  34  * This file contains the implementation of the xfs_inode_log_item.
  35  * It contains the item operations used to manipulate the inode log
  36  * items as well as utility routines used by the inode specific
  37  * transaction routines.
  38  */
  39 #include "xfs.h"
  40 #include "xfs_macros.h"
  41 #include "xfs_types.h"
  42 #include "xfs_inum.h"
  43 #include "xfs_log.h"
  44 #include "xfs_trans.h"
  45 #include "xfs_buf_item.h"
  46 #include "xfs_sb.h"
  47 #include "xfs_dir.h"
  48 #include "xfs_dir2.h"
  49 #include "xfs_dmapi.h"
  50 #include "xfs_mount.h"
  51 #include "xfs_trans_priv.h"
  52 #include "xfs_ag.h"
  53 #include "xfs_alloc_btree.h"
  54 #include "xfs_bmap_btree.h"
  55 #include "xfs_ialloc_btree.h"
  56 #include "xfs_btree.h"
  57 #include "xfs_ialloc.h"
  58 #include "xfs_attr_sf.h"
  59 #include "xfs_dir_sf.h"
  60 #include "xfs_dir2_sf.h"
  61 #include "xfs_dinode.h"
  62 #include "xfs_inode_item.h"
  63 #include "xfs_inode.h"
  64 #include "xfs_rw.h"
  65
  66
  67 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
  68
  69 /*
  70  * This returns the number of iovecs needed to log the given inode item.
  71  *
  72  * We need one iovec for the inode log format structure, one for the
  73  * inode core, and possibly one for the inode data/extents/b-tree root
  74  * and one for the inode attribute data/extents/b-tree root.
  75  */
  76 STATIC uint
  77 xfs_inode_item_size(
  78         xfs_inode_log_item_t    *iip)
  79 {
  80         uint            nvecs;
  81         xfs_inode_t     *ip;
  82
  83         ip = iip->ili_inode;
  84         nvecs = 2;
  85
  86         /*
  87          * Only log the data/extents/b-tree root if there is something
  88          * left to log.
  89          */
  90         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
  91
  92         switch (ip->i_d.di_format) {
  93         case XFS_DINODE_FMT_EXTENTS:
  94                 iip->ili_format.ilf_fields &=
  95                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
  96                           XFS_ILOG_DEV | XFS_ILOG_UUID);
  97                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
  98                     (ip->i_d.di_nextents > 0) &&
  99                     (ip->i_df.if_bytes > 0)) {
 100                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 101                         nvecs++;
 102                 } else {
 103                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
 104                 }
 105                 break;
 106
 107         case XFS_DINODE_FMT_BTREE:
 108                 ASSERT(ip->i_df.if_ext_max ==
 109                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
 110                 iip->ili_format.ilf_fields &=
 111                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 112                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 113                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
 114                     (ip->i_df.if_broot_bytes > 0)) {
 115                         ASSERT(ip->i_df.if_broot != NULL);
 116                         nvecs++;
 117                 } else {
 118                         ASSERT(!(iip->ili_format.ilf_fields &
 119                                  XFS_ILOG_DBROOT));
 120 #ifdef XFS_TRANS_DEBUG
 121                         if (iip->ili_root_size > 0) {
 122                                 ASSERT(iip->ili_root_size ==
 123                                        ip->i_df.if_broot_bytes);
 124                                 ASSERT(memcmp(iip->ili_orig_root,
 125                                             ip->i_df.if_broot,
 126                                             iip->ili_root_size) == 0);
 127                         } else {
 128                                 ASSERT(ip->i_df.if_broot_bytes == 0);
 129                         }
 130 #endif
 131                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
 132                 }
 133                 break;
 134
 135         case XFS_DINODE_FMT_LOCAL:
 136                 iip->ili_format.ilf_fields &=
 137                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
 138                           XFS_ILOG_DEV | XFS_ILOG_UUID);
 139                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
 140                     (ip->i_df.if_bytes > 0)) {
 141                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 142                         ASSERT(ip->i_d.di_size > 0);
 143                         nvecs++;
 144                 } else {
 145                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
 146                 }
 147                 break;
 148
 149         case XFS_DINODE_FMT_DEV:
 150                 iip->ili_format.ilf_fields &=
 151                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 152                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
 153                 break;
 154
 155         case XFS_DINODE_FMT_UUID:
 156                 iip->ili_format.ilf_fields &=
 157                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 158                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
 159                 break;
 160
 161         default:
 162                 ASSERT(0);
 163                 break;
 164         }
 165
 166         /*
 167          * If there are no attributes associated with this file,
 168          * then there cannot be anything more to log.
 169          * Clear all attribute-related log flags.
 170          */
 171         if (!XFS_IFORK_Q(ip)) {
 172                 iip->ili_format.ilf_fields &=
 173                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
 174                 return nvecs;
 175         }
 176
 177         /*
 178          * Log any necessary attribute data.
 179          */
 180         switch (ip->i_d.di_aformat) {
 181         case XFS_DINODE_FMT_EXTENTS:
 182                 iip->ili_format.ilf_fields &=
 183                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
 184                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
 185                     (ip->i_d.di_anextents > 0) &&
 186                     (ip->i_afp->if_bytes > 0)) {
 187                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 188                         nvecs++;
 189                 } else {
 190                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
 191                 }
 192                 break;
 193
 194         case XFS_DINODE_FMT_BTREE:
 195                 iip->ili_format.ilf_fields &=
 196                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
 197                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
 198                     (ip->i_afp->if_broot_bytes > 0)) {
 199                         ASSERT(ip->i_afp->if_broot != NULL);
 200                         nvecs++;
 201                 } else {
 202                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
 203                 }
 204                 break;
 205
 206         case XFS_DINODE_FMT_LOCAL:
 207                 iip->ili_format.ilf_fields &=
 208                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
 209                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
 210                     (ip->i_afp->if_bytes > 0)) {
 211                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 212                         nvecs++;
 213                 } else {
 214                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
 215                 }
 216                 break;
 217
 218         default:
 219                 ASSERT(0);
 220                 break;
 221         }
 222
 223         return nvecs;
 224 }
 225
 226 /*
 227  * This is called to fill in the vector of log iovecs for the
 228  * given inode log item.  It fills the first item with an inode
 229  * log format structure, the second with the on-disk inode structure,
 230  * and a possible third and/or fourth with the inode data/extents/b-tree
 231  * root and inode attributes data/extents/b-tree root.
 232  */
 233 STATIC void
 234 xfs_inode_item_format(
 235         xfs_inode_log_item_t    *iip,
 236         xfs_log_iovec_t         *log_vector)
 237 {
 238         uint                    nvecs;
 239         xfs_log_iovec_t         *vecp;
 240         xfs_inode_t             *ip;
 241         size_t                  data_bytes;
 242         xfs_bmbt_rec_t          *ext_buffer;
 243         int                     nrecs;
 244         xfs_mount_t             *mp;
 245
 246         ip = iip->ili_inode;
 247         vecp = log_vector;
 248
 249         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
 250         vecp->i_len  = sizeof(xfs_inode_log_format_t);
 251         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
 252         vecp++;
 253         nvecs        = 1;
 254
 255         /*
 256          * Clear i_update_core if the timestamps (or any other
 257          * non-transactional modification) need flushing/logging
 258          * and we're about to log them with the rest of the core.
 259          *
 260          * This is the same logic as xfs_iflush() but this code can't
 261          * run at the same time as xfs_iflush because we're in commit
 262          * processing here and so we have the inode lock held in
 263          * exclusive mode.  Although it doesn't really matter
 264          * for the timestamps if both routines were to grab the
 265          * timestamps or not.  That would be ok.
 266          *
 267          * We clear i_update_core before copying out the data.
 268          * This is for coordination with our timestamp updates
 269          * that don't hold the inode lock. They will always
 270          * update the timestamps BEFORE setting i_update_core,
 271          * so if we clear i_update_core after they set it we
 272          * are guaranteed to see their updates to the timestamps
 273          * either here.  Likewise, if they set it after we clear it
 274          * here, we'll see it either on the next commit of this
 275          * inode or the next time the inode gets flushed via
 276          * xfs_iflush().  This depends on strongly ordered memory
 277          * semantics, but we have that.  We use the SYNCHRONIZE
 278          * macro to make sure that the compiler does not reorder
 279          * the i_update_core access below the data copy below.
 280          */
 281         if (ip->i_update_core)  {
 282                 ip->i_update_core = 0;
 283                 SYNCHRONIZE();
 284         }
 285
 286         /*
 287          * We don't have to worry about re-ordering here because
 288          * the update_size field is protected by the inode lock
 289          * and we have that held in exclusive mode.
 290          */
 291         if (ip->i_update_size)
 292                 ip->i_update_size = 0;
 293
 294         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
 295         vecp->i_len  = sizeof(xfs_dinode_core_t);
 296         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
 297         vecp++;
 298         nvecs++;
 299         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
 300
 301         /*
 302          * If this is really an old format inode, then we need to
 303          * log it as such.  This means that we have to copy the link
 304          * count from the new field to the old.  We don't have to worry
 305          * about the new fields, because nothing trusts them as long as
 306          * the old inode version number is there.  If the superblock already
 307          * has a new version number, then we don't bother converting back.
 308          */
 309         mp = ip->i_mount;
 310         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
 311                XFS_SB_VERSION_HASNLINK(&mp->m_sb));
 312         if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
 313                 if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) {
 314                         /*
 315                          * Convert it back.
 316                          */
 317                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
 318                         ip->i_d.di_onlink = ip->i_d.di_nlink;
 319                 } else {
 320                         /*
 321                          * The superblock version has already been bumped,
 322                          * so just make the conversion to the new inode
 323                          * format permanent.
 324                          */
 325                         ip->i_d.di_version = XFS_DINODE_VERSION_2;
 326                         ip->i_d.di_onlink = 0;
 327                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
 328                 }
 329         }
 330
 331         switch (ip->i_d.di_format) {
 332         case XFS_DINODE_FMT_EXTENTS:
 333                 ASSERT(!(iip->ili_format.ilf_fields &
 334                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
 335                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 336                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
 337                         ASSERT(ip->i_df.if_bytes > 0);
 338                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
 339                         ASSERT(ip->i_d.di_nextents > 0);
 340                         ASSERT(iip->ili_extents_buf == NULL);
 341                         nrecs = ip->i_df.if_bytes /
 342                                 (uint)sizeof(xfs_bmbt_rec_t);
 343                         ASSERT(nrecs > 0);
 344 #if __BYTE_ORDER == __BIG_ENDIAN
 345                         if (nrecs == ip->i_d.di_nextents) {
 346                                 /*
 347                                  * There are no delayed allocation
 348                                  * extents, so just point to the
 349                                  * real extents array.
 350                                  */
 351                                 vecp->i_addr =
 352                                         (char *)(ip->i_df.if_u1.if_extents);
 353                                 vecp->i_len = ip->i_df.if_bytes;
 354                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 355                         } else
 356 #endif
 357                         {
 358                                 /*
 359                                  * There are delayed allocation extents
 360                                  * in the inode, or we need to convert
 361                                  * the extents to on disk format.
 362                                  * Use xfs_iextents_copy()
 363                                  * to copy only the real extents into
 364                                  * a separate buffer.  We'll free the
 365                                  * buffer in the unlock routine.
 366                                  */
 367                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
 368                                         KM_SLEEP);
 369                                 iip->ili_extents_buf = ext_buffer;
 370                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
 371                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 372                                                 XFS_DATA_FORK);
 373                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
 374                         }
 375                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
 376                         iip->ili_format.ilf_dsize = vecp->i_len;
 377                         vecp++;
 378                         nvecs++;
 379                 }
 380                 break;
 381
 382         case XFS_DINODE_FMT_BTREE:
 383                 ASSERT(!(iip->ili_format.ilf_fields &
 384                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
 385                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 386                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
 387                         ASSERT(ip->i_df.if_broot_bytes > 0);
 388                         ASSERT(ip->i_df.if_broot != NULL);
 389                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
 390                         vecp->i_len = ip->i_df.if_broot_bytes;
 391                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
 392                         vecp++;
 393                         nvecs++;
 394                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
 395                 }
 396                 break;
 397
 398         case XFS_DINODE_FMT_LOCAL:
 399                 ASSERT(!(iip->ili_format.ilf_fields &
 400                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 401                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
 402                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
 403                         ASSERT(ip->i_df.if_bytes > 0);
 404                         ASSERT(ip->i_df.if_u1.if_data != NULL);
 405                         ASSERT(ip->i_d.di_size > 0);
 406
 407                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
 408                         /*
 409                          * Round i_bytes up to a word boundary.
 410                          * The underlying memory is guaranteed to
 411                          * to be there by xfs_idata_realloc().
 412                          */
 413                         data_bytes = roundup(ip->i_df.if_bytes, 4);
 414                         ASSERT((ip->i_df.if_real_bytes == 0) ||
 415                                (ip->i_df.if_real_bytes == data_bytes));
 416                         vecp->i_len = (int)data_bytes;
 417                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
 418                         vecp++;
 419                         nvecs++;
 420                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
 421                 }
 422                 break;
 423
 424         case XFS_DINODE_FMT_DEV:
 425                 ASSERT(!(iip->ili_format.ilf_fields &
 426                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 427                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
 428                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
 429                         iip->ili_format.ilf_u.ilfu_rdev =
 430                                 ip->i_df.if_u2.if_rdev;
 431                 }
 432                 break;
 433
 434         case XFS_DINODE_FMT_UUID:
 435                 ASSERT(!(iip->ili_format.ilf_fields &
 436                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
 437                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
 438                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
 439                         iip->ili_format.ilf_u.ilfu_uuid =
 440                                 ip->i_df.if_u2.if_uuid;
 441                 }
 442                 break;
 443
 444         default:
 445                 ASSERT(0);
 446                 break;
 447         }
 448
 449         /*
 450          * If there are no attributes associated with the file,
 451          * then we're done.
 452          * Assert that no attribute-related log flags are set.
 453          */
 454         if (!XFS_IFORK_Q(ip)) {
 455                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 456                 iip->ili_format.ilf_size = nvecs;
 457                 ASSERT(!(iip->ili_format.ilf_fields &
 458                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 459                 return;
 460         }
 461
 462         switch (ip->i_d.di_aformat) {
 463         case XFS_DINODE_FMT_EXTENTS:
 464                 ASSERT(!(iip->ili_format.ilf_fields &
 465                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
 466                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
 467                         ASSERT(ip->i_afp->if_bytes > 0);
 468                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
 469                         ASSERT(ip->i_d.di_anextents > 0);
 470 #ifdef DEBUG
 471                         nrecs = ip->i_afp->if_bytes /
 472                                 (uint)sizeof(xfs_bmbt_rec_t);
 473 #endif
 474                         ASSERT(nrecs > 0);
 475                         ASSERT(nrecs == ip->i_d.di_anextents);
 476 #if __BYTE_ORDER == __BIG_ENDIAN
 477                         /*
 478                          * There are not delayed allocation extents
 479                          * for attributes, so just point at the array.
 480                          */
 481                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
 482                         vecp->i_len = ip->i_afp->if_bytes;
 483 #else
 484                         ASSERT(iip->ili_aextents_buf == NULL);
 485                         /*
 486                          * Need to endian flip before logging
 487                          */
 488                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
 489                                 KM_SLEEP);
 490                         iip->ili_aextents_buf = ext_buffer;
 491                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
 492                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
 493                                         XFS_ATTR_FORK);
 494 #endif
 495                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
 496                         iip->ili_format.ilf_asize = vecp->i_len;
 497                         vecp++;
 498                         nvecs++;
 499                 }
 500                 break;
 501
 502         case XFS_DINODE_FMT_BTREE:
 503                 ASSERT(!(iip->ili_format.ilf_fields &
 504                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
 505                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
 506                         ASSERT(ip->i_afp->if_broot_bytes > 0);
 507                         ASSERT(ip->i_afp->if_broot != NULL);
 508                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
 509                         vecp->i_len = ip->i_afp->if_broot_bytes;
 510                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
 511                         vecp++;
 512                         nvecs++;
 513                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
 514                 }
 515                 break;
 516
 517         case XFS_DINODE_FMT_LOCAL:
 518                 ASSERT(!(iip->ili_format.ilf_fields &
 519                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
 520                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
 521                         ASSERT(ip->i_afp->if_bytes > 0);
 522                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
 523
 524                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
 525                         /*
 526                          * Round i_bytes up to a word boundary.
 527                          * The underlying memory is guaranteed to
 528                          * to be there by xfs_idata_realloc().
 529                          */
 530                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
 531                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
 532                                (ip->i_afp->if_real_bytes == data_bytes));
 533                         vecp->i_len = (int)data_bytes;
 534                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
 535                         vecp++;
 536                         nvecs++;
 537                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
 538                 }
 539                 break;
 540
 541         default:
 542                 ASSERT(0);
 543                 break;
 544         }
 545
 546         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
 547         iip->ili_format.ilf_size = nvecs;
 548 }
 549
 550
 551 /*
 552  * This is called to pin the inode associated with the inode log
 553  * item in memory so it cannot be written out.  Do this by calling
 554  * xfs_ipin() to bump the pin count in the inode while holding the
 555  * inode pin lock.
 556  */
 557 STATIC void
 558 xfs_inode_item_pin(
 559         xfs_inode_log_item_t    *iip)
 560 {
 561         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 562         xfs_ipin(iip->ili_inode);
 563 }
 564
 565
 566 /*
 567  * This is called to unpin the inode associated with the inode log
 568  * item which was previously pinned with a call to xfs_inode_item_pin().
 569  * Just call xfs_iunpin() on the inode to do this.
 570  */
 571 /* ARGSUSED */
 572 STATIC void
 573 xfs_inode_item_unpin(
 574         xfs_inode_log_item_t    *iip,
 575         int                     stale)
 576 {
 577         xfs_iunpin(iip->ili_inode);
 578 }
 579
 580 /* ARGSUSED */
 581 STATIC void
 582 xfs_inode_item_unpin_remove(
 583         xfs_inode_log_item_t    *iip,
 584         xfs_trans_t             *tp)
 585 {
 586         xfs_iunpin(iip->ili_inode);
 587 }
 588
 589 /*
 590  * This is called to attempt to lock the inode associated with this
 591  * inode log item, in preparation for the push routine which does the actual
 592  * iflush.  Don't sleep on the inode lock or the flush lock.
 593  *
 594  * If the flush lock is already held, indicating that the inode has
 595  * been or is in the process of being flushed, then (ideally) we'd like to
 596  * see if the inode's buffer is still incore, and if so give it a nudge.
 597  * We delay doing so until the pushbuf routine, though, to avoid holding
 598  * the AIL lock across a call to the blackhole which is the buffercache.
 599  * Also we don't want to sleep in any device strategy routines, which can happen
 600  * if we do the subsequent bawrite in here.
 601  */
 602 STATIC uint
 603 xfs_inode_item_trylock(
 604         xfs_inode_log_item_t    *iip)
 605 {
 606         register xfs_inode_t    *ip;
 607
 608         ip = iip->ili_inode;
 609
 610         if (xfs_ipincount(ip) > 0) {
 611                 return XFS_ITEM_PINNED;
 612         }
 613
 614         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
 615                 return XFS_ITEM_LOCKED;
 616         }
 617
 618         if (!xfs_iflock_nowait(ip)) {
 619                 /*
 620                  * If someone else isn't already trying to push the inode
 621                  * buffer, we get to do it.
 622                  */
 623                 if (iip->ili_pushbuf_flag == 0) {
 624                         iip->ili_pushbuf_flag = 1;
 625 #ifdef DEBUG
 626                         iip->ili_push_owner = get_thread_id();
 627 #endif
 628                         /*
 629                          * Inode is left locked in shared mode.
 630                          * Pushbuf routine gets to unlock it.
 631                          */
 632                         return XFS_ITEM_PUSHBUF;
 633                 } else {
 634                         /*
 635                          * We hold the AIL_LOCK, so we must specify the
 636                          * NONOTIFY flag so that we won't double trip.
 637                          */
 638                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 639                         return XFS_ITEM_FLUSHING;
 640                 }
 641                 /* NOTREACHED */
 642         }
 643
 644         /* Stale items should force out the iclog */
 645         if (ip->i_flags & XFS_ISTALE) {
 646                 xfs_ifunlock(ip);
 647                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
 648                 return XFS_ITEM_PINNED;
 649         }
 650
 651 #ifdef DEBUG
 652         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
 653                 ASSERT(iip->ili_format.ilf_fields != 0);
 654                 ASSERT(iip->ili_logged == 0);
 655                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
 656         }
 657 #endif
 658         return XFS_ITEM_SUCCESS;
 659 }
 660
 661 /*
 662  * Unlock the inode associated with the inode log item.
 663  * Clear the fields of the inode and inode log item that
 664  * are specific to the current transaction.  If the
 665  * hold flags is set, do not unlock the inode.
 666  */
 667 STATIC void
 668 xfs_inode_item_unlock(
 669         xfs_inode_log_item_t    *iip)
 670 {
 671         uint            hold;
 672         uint            iolocked;
 673         uint            lock_flags;
 674         xfs_inode_t     *ip;
 675
 676         ASSERT(iip != NULL);
 677         ASSERT(iip->ili_inode->i_itemp != NULL);
 678         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
 679         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 680                   XFS_ILI_IOLOCKED_EXCL)) ||
 681                ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
 682         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
 683                   XFS_ILI_IOLOCKED_SHARED)) ||
 684                ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
 685         /*
 686          * Clear the transaction pointer in the inode.
 687          */
 688         ip = iip->ili_inode;
 689         ip->i_transp = NULL;
 690
 691         /*
 692          * If the inode needed a separate buffer with which to log
 693          * its extents, then free it now.
 694          */
 695         if (iip->ili_extents_buf != NULL) {
 696                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
 697                 ASSERT(ip->i_d.di_nextents > 0);
 698                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
 699                 ASSERT(ip->i_df.if_bytes > 0);
 700                 kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
 701                 iip->ili_extents_buf = NULL;
 702         }
 703         if (iip->ili_aextents_buf != NULL) {
 704                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
 705                 ASSERT(ip->i_d.di_anextents > 0);
 706                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
 707                 ASSERT(ip->i_afp->if_bytes > 0);
 708                 kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
 709                 iip->ili_aextents_buf = NULL;
 710         }
 711
 712         /*
 713          * Figure out if we should unlock the inode or not.
 714          */
 715         hold = iip->ili_flags & XFS_ILI_HOLD;
 716
 717         /*
 718          * Before clearing out the flags, remember whether we
 719          * are holding the inode's IO lock.
 720          */
 721         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
 722
 723         /*
 724          * Clear out the fields of the inode log item particular
 725          * to the current transaction.
 726          */
 727         iip->ili_ilock_recur = 0;
 728         iip->ili_iolock_recur = 0;
 729         iip->ili_flags = 0;
 730
 731         /*
 732          * Unlock the inode if XFS_ILI_HOLD was not set.
 733          */
 734         if (!hold) {
 735                 lock_flags = XFS_ILOCK_EXCL;
 736                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
 737                         lock_flags |= XFS_IOLOCK_EXCL;
 738                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
 739                         lock_flags |= XFS_IOLOCK_SHARED;
 740                 }
 741                 xfs_iput(iip->ili_inode, lock_flags);
 742         }
 743 }
 744
 745 /*
 746  * This is called to find out where the oldest active copy of the
 747  * inode log item in the on disk log resides now that the last log
 748  * write of it completed at the given lsn.  Since we always re-log
 749  * all dirty data in an inode, the latest copy in the on disk log
 750  * is the only one that matters.  Therefore, simply return the
 751  * given lsn.
 752  */
 753 /*ARGSUSED*/
 754 STATIC xfs_lsn_t
 755 xfs_inode_item_committed(
 756         xfs_inode_log_item_t    *iip,
 757         xfs_lsn_t               lsn)
 758 {
 759         return (lsn);
 760 }
 761
 762 /*
 763  * The transaction with the inode locked has aborted.  The inode
 764  * must not be dirty within the transaction (unless we're forcibly
 765  * shutting down).  We simply unlock just as if the transaction
 766  * had been cancelled.
 767  */
 768 STATIC void
 769 xfs_inode_item_abort(
 770         xfs_inode_log_item_t    *iip)
 771 {
 772         xfs_inode_item_unlock(iip);
 773         return;
 774 }
 775
 776
 777 /*
 778  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
 779  * failed to get the inode flush lock but did get the inode locked SHARED.
 780  * Here we're trying to see if the inode buffer is incore, and if so whether it's
 781  * marked delayed write. If that's the case, we'll initiate a bawrite on that
 782  * buffer to expedite the process.
 783  *
 784  * We aren't holding the AIL_LOCK (or the flush lock) when this gets called,
 785  * so it is inherently race-y.
 786  */
 787 STATIC void
 788 xfs_inode_item_pushbuf(
 789         xfs_inode_log_item_t    *iip)
 790 {
 791         xfs_inode_t     *ip;
 792         xfs_mount_t     *mp;
 793         xfs_buf_t       *bp;
 794         uint            dopush;
 795
 796         ip = iip->ili_inode;
 797
 798         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 799
 800         /*
 801          * The ili_pushbuf_flag keeps others from
 802          * trying to duplicate our effort.
 803          */
 804         ASSERT(iip->ili_pushbuf_flag != 0);
 805         ASSERT(iip->ili_push_owner == get_thread_id());
 806
 807         /*
 808          * If flushlock isn't locked anymore, chances are that the
 809          * inode flush completed and the inode was taken off the AIL.
 810          * So, just get out.
 811          */
 812         if ((valusema(&(ip->i_flock)) > 0)  ||
 813             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
 814                 iip->ili_pushbuf_flag = 0;
 815                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
 816                 return;
 817         }
 818
 819         mp = ip->i_mount;
 820         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
 821                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
 822
 823         if (bp != NULL) {
 824                 if (XFS_BUF_ISDELAYWRITE(bp)) {
 825                         /*
 826                          * We were racing with iflush because we don't hold
 827                          * the AIL_LOCK or the flush lock. However, at this point,
 828                          * we have the buffer, and we know that it's dirty.
 829                          * So, it's possible that iflush raced with us, and
 830                          * this item is already taken off the AIL.
 831                          * If not, we can flush it async.
 832                          */
 833                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
 834                                   (valusema(&(ip->i_flock)) <= 0));
 835                         iip->ili_pushbuf_flag = 0;
 836                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 837                         xfs_buftrace("INODE ITEM PUSH", bp);
 838                         if (XFS_BUF_ISPINNED(bp)) {
 839                                 xfs_log_force(mp, (xfs_lsn_t)0,
 840                                               XFS_LOG_FORCE);
 841                         }
 842                         if (dopush) {
 843                                 xfs_bawrite(mp, bp);
 844                         } else {
 845                                 xfs_buf_relse(bp);
 846                         }
 847                 } else {
 848                         iip->ili_pushbuf_flag = 0;
 849                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 850                         xfs_buf_relse(bp);
 851                 }
 852                 return;
 853         }
 854         /*
 855          * We have to be careful about resetting pushbuf flag too early (above).
 856          * Even though in theory we can do it as soon as we have the buflock,
 857          * we don't want others to be doing work needlessly. They'll come to
 858          * this function thinking that pushing the buffer is their
 859          * responsibility only to find that the buffer is still locked by
 860          * another doing the same thing
 861          */
 862         iip->ili_pushbuf_flag = 0;
 863         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 864         return;
 865 }
 866
 867
 868 /*
 869  * This is called to asynchronously write the inode associated with this
 870  * inode log item out to disk. The inode will already have been locked by
 871  * a successful call to xfs_inode_item_trylock().
 872  */
 873 STATIC void
 874 xfs_inode_item_push(
 875         xfs_inode_log_item_t    *iip)
 876 {
 877         xfs_inode_t     *ip;
 878
 879         ip = iip->ili_inode;
 880
 881         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
 882         ASSERT(valusema(&(ip->i_flock)) <= 0);
 883         /*
 884          * Since we were able to lock the inode's flush lock and
 885          * we found it on the AIL, the inode must be dirty.  This
 886          * is because the inode is removed from the AIL while still
 887          * holding the flush lock in xfs_iflush_done().  Thus, if
 888          * we found it in the AIL and were able to obtain the flush
 889          * lock without sleeping, then there must not have been
 890          * anyone in the process of flushing the inode.
 891          */
 892         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
 893                iip->ili_format.ilf_fields != 0);
 894
 895         /*
 896          * Write out the inode.  The completion routine ('iflush_done') will
 897          * pull it from the AIL, mark it clean, unlock the flush lock.
 898          */
 899         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
 900         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 901
 902         return;
 903 }
 904
 905 /*
 906  * XXX rcc - this one really has to do something.  Probably needs
 907  * to stamp in a new field in the incore inode.
 908  */
 909 /* ARGSUSED */
 910 STATIC void
 911 xfs_inode_item_committing(
 912         xfs_inode_log_item_t    *iip,
 913         xfs_lsn_t               lsn)
 914 {
 915         iip->ili_last_lsn = lsn;
 916         return;
 917 }
 918
 919 /*
 920  * This is the ops vector shared by all buf log items.
 921  */
 922 STATIC struct xfs_item_ops xfs_inode_item_ops = {
 923         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
 924         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
 925                                         xfs_inode_item_format,
 926         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
 927         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
 928         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
 929                                         xfs_inode_item_unpin_remove,
 930         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
 931         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
 932         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
 933                                         xfs_inode_item_committed,
 934         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
 935         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_inode_item_abort,
 936         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
 937         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
 938                                         xfs_inode_item_committing
 939 };
 940
 941
 942 /*
 943  * Initialize the inode log item for a newly allocated (in-core) inode.
 944  */
 945 void
 946 xfs_inode_item_init(
 947         xfs_inode_t     *ip,
 948         xfs_mount_t     *mp)
 949 {
 950         xfs_inode_log_item_t    *iip;
 951
 952         ASSERT(ip->i_itemp == NULL);
 953         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
 954
 955         iip->ili_item.li_type = XFS_LI_INODE;
 956         iip->ili_item.li_ops = &xfs_inode_item_ops;
 957         iip->ili_item.li_mountp = mp;
 958         iip->ili_inode = ip;
 959
 960         /*
 961            We have zeroed memory. No need ...
 962            iip->ili_extents_buf = NULL;
 963            iip->ili_pushbuf_flag = 0;
 964          */
 965
 966         iip->ili_format.ilf_type = XFS_LI_INODE;
 967         iip->ili_format.ilf_ino = ip->i_ino;
 968         iip->ili_format.ilf_blkno = ip->i_blkno;
 969         iip->ili_format.ilf_len = ip->i_len;
 970         iip->ili_format.ilf_boffset = ip->i_boffset;
 971 }
 972
 973 /*
 974  * Free the inode log item and any memory hanging off of it.
 975  */
 976 void
 977 xfs_inode_item_destroy(
 978         xfs_inode_t     *ip)
 979 {
 980 #ifdef XFS_TRANS_DEBUG
 981         if (ip->i_itemp->ili_root_size != 0) {
 982                 kmem_free(ip->i_itemp->ili_orig_root,
 983                           ip->i_itemp->ili_root_size);
 984         }
 985 #endif
 986         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
 987 }
 988
 989
 990 /*
 991  * This is the inode flushing I/O completion routine.  It is called
 992  * from interrupt level when the buffer containing the inode is
 993  * flushed to disk.  It is responsible for removing the inode item
 994  * from the AIL if it has not been re-logged, and unlocking the inode's
 995  * flush lock.
 996  */
 997 /*ARGSUSED*/
 998 void
 999 xfs_iflush_done(
1000         xfs_buf_t               *bp,
1001         xfs_inode_log_item_t    *iip)
1002 {
1003         xfs_inode_t     *ip;
1004         SPLDECL(s);
1005
1006         ip = iip->ili_inode;
1007
1008         /*
1009          * We only want to pull the item from the AIL if it is
1010          * actually there and its location in the log has not
1011          * changed since we started the flush.  Thus, we only bother
1012          * if the ili_logged flag is set and the inode's lsn has not
1013          * changed.  First we check the lsn outside
1014          * the lock since it's cheaper, and then we recheck while
1015          * holding the lock before removing the inode from the AIL.
1016          */
1017         if (iip->ili_logged &&
1018             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
1019                 AIL_LOCK(ip->i_mount, s);
1020                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
1021                         /*
1022                          * xfs_trans_delete_ail() drops the AIL lock.
1023                          */
1024                         xfs_trans_delete_ail(ip->i_mount,
1025                                              (xfs_log_item_t*)iip, s);
1026                 } else {
1027                         AIL_UNLOCK(ip->i_mount, s);
1028                 }
1029         }
1030
1031         iip->ili_logged = 0;
1032
1033         /*
1034          * Clear the ili_last_fields bits now that we know that the
1035          * data corresponding to them is safely on disk.
1036          */
1037         iip->ili_last_fields = 0;
1038
1039         /*
1040          * Release the inode's flush lock since we're done with it.
1041          */
1042         xfs_ifunlock(ip);
1043
1044         return;
1045 }
1046
1047 /*
1048  * This is the inode flushing abort routine.  It is called
1049  * from xfs_iflush when the filesystem is shutting down to clean
1050  * up the inode state.
1051  * It is responsible for removing the inode item
1052  * from the AIL if it has not been re-logged, and unlocking the inode's
1053  * flush lock.
1054  */
1055 void
1056 xfs_iflush_abort(
1057         xfs_inode_t             *ip)
1058 {
1059         xfs_inode_log_item_t    *iip;
1060         xfs_mount_t             *mp;
1061         SPLDECL(s);
1062
1063         iip = ip->i_itemp;
1064         mp = ip->i_mount;
1065         if (iip) {
1066                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1067                         AIL_LOCK(mp, s);
1068                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1069                                 /*
1070                                  * xfs_trans_delete_ail() drops the AIL lock.
1071                                  */
1072                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
1073                                         s);
1074                         } else
1075                                 AIL_UNLOCK(mp, s);
1076                 }
1077                 iip->ili_logged = 0;
1078                 /*
1079                  * Clear the ili_last_fields bits now that we know that the
1080                  * data corresponding to them is safely on disk.
1081                  */
1082                 iip->ili_last_fields = 0;
1083                 /*
1084                  * Clear the inode logging fields so no more flushes are
1085                  * attempted.
1086                  */
1087                 iip->ili_format.ilf_fields = 0;
1088         }
1089         /*
1090          * Release the inode's flush lock since we're done with it.
1091          */
1092         xfs_ifunlock(ip);
1093 }
1094
1095 void
1096 xfs_istale_done(
1097         xfs_buf_t               *bp,
1098         xfs_inode_log_item_t    *iip)
1099 {
1100         xfs_iflush_abort(iip->ili_inode);
1101 }