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