fs/xfs/libxfs/xfs_attr.c

   1 /*
   2  * Copyright (c) 2000-2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_da_format.h"
  27 #include "xfs_da_btree.h"
  28 #include "xfs_attr_sf.h"
  29 #include "xfs_inode.h"
  30 #include "xfs_alloc.h"
  31 #include "xfs_trans.h"
  32 #include "xfs_inode_item.h"
  33 #include "xfs_bmap.h"
  34 #include "xfs_bmap_util.h"
  35 #include "xfs_bmap_btree.h"
  36 #include "xfs_attr.h"
  37 #include "xfs_attr_leaf.h"
  38 #include "xfs_attr_remote.h"
  39 #include "xfs_error.h"
  40 #include "xfs_quota.h"
  41 #include "xfs_trans_space.h"
  42 #include "xfs_trace.h"
  43
  44 /*
  45  * xfs_attr.c
  46  *
  47  * Provide the external interfaces to manage attribute lists.
  48  */
  49
  50 /*========================================================================
  51  * Function prototypes for the kernel.
  52  *========================================================================*/
  53
  54 /*
  55  * Internal routines when attribute list fits inside the inode.
  56  */
  57 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
  58
  59 /*
  60  * Internal routines when attribute list is one block.
  61  */
  62 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
  63 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
  64 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
  65
  66 /*
  67  * Internal routines when attribute list is more than one block.
  68  */
  69 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
  70 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
  71 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
  72 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
  73 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
  74
  75
  76 STATIC int
  77 xfs_attr_args_init(
  78         struct xfs_da_args      *args,
  79         struct xfs_inode        *dp,
  80         const unsigned char     *name,
  81         int                     flags)
  82 {
  83
  84         if (!name)
  85                 return -EINVAL;
  86
  87         memset(args, 0, sizeof(*args));
  88         args->geo = dp->i_mount->m_attr_geo;
  89         args->whichfork = XFS_ATTR_FORK;
  90         args->dp = dp;
  91         args->flags = flags;
  92         args->name = name;
  93         args->namelen = strlen((const char *)name);
  94         if (args->namelen >= MAXNAMELEN)
  95                 return -EFAULT;         /* match IRIX behaviour */
  96
  97         args->hashval = xfs_da_hashname(args->name, args->namelen);
  98         return 0;
  99 }
 100
 101 int
 102 xfs_inode_hasattr(
 103         struct xfs_inode        *ip)
 104 {
 105         if (!XFS_IFORK_Q(ip) ||
 106             (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 107              ip->i_d.di_anextents == 0))
 108                 return 0;
 109         return 1;
 110 }
 111
 112 /*========================================================================
 113  * Overall external interface routines.
 114  *========================================================================*/
 115
 116 int
 117 xfs_attr_get(
 118         struct xfs_inode        *ip,
 119         const unsigned char     *name,
 120         unsigned char           *value,
 121         int                     *valuelenp,
 122         int                     flags)
 123 {
 124         struct xfs_da_args      args;
 125         uint                    lock_mode;
 126         int                     error;
 127
 128         XFS_STATS_INC(xs_attr_get);
 129
 130         if (XFS_FORCED_SHUTDOWN(ip->i_mount))
 131                 return -EIO;
 132
 133         if (!xfs_inode_hasattr(ip))
 134                 return -ENOATTR;
 135
 136         error = xfs_attr_args_init(&args, ip, name, flags);
 137         if (error)
 138                 return error;
 139
 140         args.value = value;
 141         args.valuelen = *valuelenp;
 142
 143         lock_mode = xfs_ilock_attr_map_shared(ip);
 144         if (!xfs_inode_hasattr(ip))
 145                 error = -ENOATTR;
 146         else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL)
 147                 error = xfs_attr_shortform_getvalue(&args);
 148         else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK))
 149                 error = xfs_attr_leaf_get(&args);
 150         else
 151                 error = xfs_attr_node_get(&args);
 152         xfs_iunlock(ip, lock_mode);
 153
 154         *valuelenp = args.valuelen;
 155         return error == -EEXIST ? 0 : error;
 156 }
 157
 158 /*
 159  * Calculate how many blocks we need for the new attribute,
 160  */
 161 STATIC int
 162 xfs_attr_calc_size(
 163         struct xfs_da_args      *args,
 164         int                     *local)
 165 {
 166         struct xfs_mount        *mp = args->dp->i_mount;
 167         int                     size;
 168         int                     nblks;
 169
 170         /*
 171          * Determine space new attribute will use, and if it would be
 172          * "local" or "remote" (note: local != inline).
 173          */
 174         size = xfs_attr_leaf_newentsize(args, local);
 175         nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
 176         if (*local) {
 177                 if (size > (args->geo->blksize / 2)) {
 178                         /* Double split possible */
 179                         nblks *= 2;
 180                 }
 181         } else {
 182                 /*
 183                  * Out of line attribute, cannot double split, but
 184                  * make room for the attribute value itself.
 185                  */
 186                 uint    dblocks = xfs_attr3_rmt_blocks(mp, args->valuelen);
 187                 nblks += dblocks;
 188                 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
 189         }
 190
 191         return nblks;
 192 }
 193
 194 int
 195 xfs_attr_set(
 196         struct xfs_inode        *dp,
 197         const unsigned char     *name,
 198         unsigned char           *value,
 199         int                     valuelen,
 200         int                     flags)
 201 {
 202         struct xfs_mount        *mp = dp->i_mount;
 203         struct xfs_da_args      args;
 204         struct xfs_bmap_free    flist;
 205         struct xfs_trans_res    tres;
 206         xfs_fsblock_t           firstblock;
 207         int                     rsvd = (flags & ATTR_ROOT) != 0;
 208         int                     error, err2, committed, local;
 209
 210         XFS_STATS_INC(xs_attr_set);
 211
 212         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 213                 return -EIO;
 214
 215         error = xfs_attr_args_init(&args, dp, name, flags);
 216         if (error)
 217                 return error;
 218
 219         args.value = value;
 220         args.valuelen = valuelen;
 221         args.firstblock = &firstblock;
 222         args.flist = &flist;
 223         args.op_flags = XFS_DA_OP_ADDNAME | XFS_DA_OP_OKNOENT;
 224         args.total = xfs_attr_calc_size(&args, &local);
 225
 226         error = xfs_qm_dqattach(dp, 0);
 227         if (error)
 228                 return error;
 229
 230         /*
 231          * If the inode doesn't have an attribute fork, add one.
 232          * (inode must not be locked when we call this routine)
 233          */
 234         if (XFS_IFORK_Q(dp) == 0) {
 235                 int sf_size = sizeof(xfs_attr_sf_hdr_t) +
 236                         XFS_ATTR_SF_ENTSIZE_BYNAME(args.namelen, valuelen);
 237
 238                 error = xfs_bmap_add_attrfork(dp, sf_size, rsvd);
 239                 if (error)
 240                         return error;
 241         }
 242
 243         /*
 244          * Start our first transaction of the day.
 245          *
 246          * All future transactions during this code must be "chained" off
 247          * this one via the trans_dup() call.  All transactions will contain
 248          * the inode, and the inode will always be marked with trans_ihold().
 249          * Since the inode will be locked in all transactions, we must log
 250          * the inode in every transaction to let it float upward through
 251          * the log.
 252          */
 253         args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
 254
 255         /*
 256          * Root fork attributes can use reserved data blocks for this
 257          * operation if necessary
 258          */
 259
 260         if (rsvd)
 261                 args.trans->t_flags |= XFS_TRANS_RESERVE;
 262
 263         tres.tr_logres = M_RES(mp)->tr_attrsetm.tr_logres +
 264                          M_RES(mp)->tr_attrsetrt.tr_logres * args.total;
 265         tres.tr_logcount = XFS_ATTRSET_LOG_COUNT;
 266         tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
 267         error = xfs_trans_reserve(args.trans, &tres, args.total, 0);
 268         if (error) {
 269                 xfs_trans_cancel(args.trans);
 270                 return error;
 271         }
 272         xfs_ilock(dp, XFS_ILOCK_EXCL);
 273
 274         error = xfs_trans_reserve_quota_nblks(args.trans, dp, args.total, 0,
 275                                 rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
 276                                        XFS_QMOPT_RES_REGBLKS);
 277         if (error) {
 278                 xfs_iunlock(dp, XFS_ILOCK_EXCL);
 279                 xfs_trans_cancel(args.trans);
 280                 return error;
 281         }
 282
 283         xfs_trans_ijoin(args.trans, dp, 0);
 284
 285         /*
 286          * If the attribute list is non-existent or a shortform list,
 287          * upgrade it to a single-leaf-block attribute list.
 288          */
 289         if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL ||
 290             (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 291              dp->i_d.di_anextents == 0)) {
 292
 293                 /*
 294                  * Build initial attribute list (if required).
 295                  */
 296                 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
 297                         xfs_attr_shortform_create(&args);
 298
 299                 /*
 300                  * Try to add the attr to the attribute list in
 301                  * the inode.
 302                  */
 303                 error = xfs_attr_shortform_addname(&args);
 304                 if (error != -ENOSPC) {
 305                         /*
 306                          * Commit the shortform mods, and we're done.
 307                          * NOTE: this is also the error path (EEXIST, etc).
 308                          */
 309                         ASSERT(args.trans != NULL);
 310
 311                         /*
 312                          * If this is a synchronous mount, make sure that
 313                          * the transaction goes to disk before returning
 314                          * to the user.
 315                          */
 316                         if (mp->m_flags & XFS_MOUNT_WSYNC)
 317                                 xfs_trans_set_sync(args.trans);
 318
 319                         if (!error && (flags & ATTR_KERNOTIME) == 0) {
 320                                 xfs_trans_ichgtime(args.trans, dp,
 321                                                         XFS_ICHGTIME_CHG);
 322                         }
 323                         err2 = xfs_trans_commit(args.trans);
 324                         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 325
 326                         return error ? error : err2;
 327                 }
 328
 329                 /*
 330                  * It won't fit in the shortform, transform to a leaf block.
 331                  * GROT: another possible req'mt for a double-split btree op.
 332                  */
 333                 xfs_bmap_init(args.flist, args.firstblock);
 334                 error = xfs_attr_shortform_to_leaf(&args);
 335                 if (!error) {
 336                         error = xfs_bmap_finish(&args.trans, args.flist,
 337                                                 &committed);
 338                 }
 339                 if (error) {
 340                         ASSERT(committed);
 341                         args.trans = NULL;
 342                         xfs_bmap_cancel(&flist);
 343                         goto out;
 344                 }
 345
 346                 /*
 347                  * bmap_finish() may have committed the last trans and started
 348                  * a new one.  We need the inode to be in all transactions.
 349                  */
 350                 if (committed)
 351                         xfs_trans_ijoin(args.trans, dp, 0);
 352
 353                 /*
 354                  * Commit the leaf transformation.  We'll need another (linked)
 355                  * transaction to add the new attribute to the leaf.
 356                  */
 357
 358                 error = xfs_trans_roll(&args.trans, dp);
 359                 if (error)
 360                         goto out;
 361
 362         }
 363
 364         if (xfs_bmap_one_block(dp, XFS_ATTR_FORK))
 365                 error = xfs_attr_leaf_addname(&args);
 366         else
 367                 error = xfs_attr_node_addname(&args);
 368         if (error)
 369                 goto out;
 370
 371         /*
 372          * If this is a synchronous mount, make sure that the
 373          * transaction goes to disk before returning to the user.
 374          */
 375         if (mp->m_flags & XFS_MOUNT_WSYNC)
 376                 xfs_trans_set_sync(args.trans);
 377
 378         if ((flags & ATTR_KERNOTIME) == 0)
 379                 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
 380
 381         /*
 382          * Commit the last in the sequence of transactions.
 383          */
 384         xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 385         error = xfs_trans_commit(args.trans);
 386         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 387
 388         return error;
 389
 390 out:
 391         if (args.trans)
 392                 xfs_trans_cancel(args.trans);
 393         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 394         return error;
 395 }
 396
 397 /*
 398  * Generic handler routine to remove a name from an attribute list.
 399  * Transitions attribute list from Btree to shortform as necessary.
 400  */
 401 int
 402 xfs_attr_remove(
 403         struct xfs_inode        *dp,
 404         const unsigned char     *name,
 405         int                     flags)
 406 {
 407         struct xfs_mount        *mp = dp->i_mount;
 408         struct xfs_da_args      args;
 409         struct xfs_bmap_free    flist;
 410         xfs_fsblock_t           firstblock;
 411         int                     error;
 412
 413         XFS_STATS_INC(xs_attr_remove);
 414
 415         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 416                 return -EIO;
 417
 418         if (!xfs_inode_hasattr(dp))
 419                 return -ENOATTR;
 420
 421         error = xfs_attr_args_init(&args, dp, name, flags);
 422         if (error)
 423                 return error;
 424
 425         args.firstblock = &firstblock;
 426         args.flist = &flist;
 427
 428         /*
 429          * we have no control over the attribute names that userspace passes us
 430          * to remove, so we have to allow the name lookup prior to attribute
 431          * removal to fail.
 432          */
 433         args.op_flags = XFS_DA_OP_OKNOENT;
 434
 435         error = xfs_qm_dqattach(dp, 0);
 436         if (error)
 437                 return error;
 438
 439         /*
 440          * Start our first transaction of the day.
 441          *
 442          * All future transactions during this code must be "chained" off
 443          * this one via the trans_dup() call.  All transactions will contain
 444          * the inode, and the inode will always be marked with trans_ihold().
 445          * Since the inode will be locked in all transactions, we must log
 446          * the inode in every transaction to let it float upward through
 447          * the log.
 448          */
 449         args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
 450
 451         /*
 452          * Root fork attributes can use reserved data blocks for this
 453          * operation if necessary
 454          */
 455
 456         if (flags & ATTR_ROOT)
 457                 args.trans->t_flags |= XFS_TRANS_RESERVE;
 458
 459         error = xfs_trans_reserve(args.trans, &M_RES(mp)->tr_attrrm,
 460                                   XFS_ATTRRM_SPACE_RES(mp), 0);
 461         if (error) {
 462                 xfs_trans_cancel(args.trans);
 463                 return error;
 464         }
 465
 466         xfs_ilock(dp, XFS_ILOCK_EXCL);
 467         /*
 468          * No need to make quota reservations here. We expect to release some
 469          * blocks not allocate in the common case.
 470          */
 471         xfs_trans_ijoin(args.trans, dp, 0);
 472
 473         if (!xfs_inode_hasattr(dp)) {
 474                 error = -ENOATTR;
 475         } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
 476                 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
 477                 error = xfs_attr_shortform_remove(&args);
 478         } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
 479                 error = xfs_attr_leaf_removename(&args);
 480         } else {
 481                 error = xfs_attr_node_removename(&args);
 482         }
 483
 484         if (error)
 485                 goto out;
 486
 487         /*
 488          * If this is a synchronous mount, make sure that the
 489          * transaction goes to disk before returning to the user.
 490          */
 491         if (mp->m_flags & XFS_MOUNT_WSYNC)
 492                 xfs_trans_set_sync(args.trans);
 493
 494         if ((flags & ATTR_KERNOTIME) == 0)
 495                 xfs_trans_ichgtime(args.trans, dp, XFS_ICHGTIME_CHG);
 496
 497         /*
 498          * Commit the last in the sequence of transactions.
 499          */
 500         xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 501         error = xfs_trans_commit(args.trans);
 502         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 503
 504         return error;
 505
 506 out:
 507         if (args.trans)
 508                 xfs_trans_cancel(args.trans);
 509         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 510         return error;
 511 }
 512
 513 /*========================================================================
 514  * External routines when attribute list is inside the inode
 515  *========================================================================*/
 516
 517 /*
 518  * Add a name to the shortform attribute list structure
 519  * This is the external routine.
 520  */
 521 STATIC int
 522 xfs_attr_shortform_addname(xfs_da_args_t *args)
 523 {
 524         int newsize, forkoff, retval;
 525
 526         trace_xfs_attr_sf_addname(args);
 527
 528         retval = xfs_attr_shortform_lookup(args);
 529         if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
 530                 return retval;
 531         } else if (retval == -EEXIST) {
 532                 if (args->flags & ATTR_CREATE)
 533                         return retval;
 534                 retval = xfs_attr_shortform_remove(args);
 535                 ASSERT(retval == 0);
 536         }
 537
 538         if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
 539             args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
 540                 return -ENOSPC;
 541
 542         newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
 543         newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
 544
 545         forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
 546         if (!forkoff)
 547                 return -ENOSPC;
 548
 549         xfs_attr_shortform_add(args, forkoff);
 550         return 0;
 551 }
 552
 553
 554 /*========================================================================
 555  * External routines when attribute list is one block
 556  *========================================================================*/
 557
 558 /*
 559  * Add a name to the leaf attribute list structure
 560  *
 561  * This leaf block cannot have a "remote" value, we only call this routine
 562  * if bmap_one_block() says there is only one block (ie: no remote blks).
 563  */
 564 STATIC int
 565 xfs_attr_leaf_addname(xfs_da_args_t *args)
 566 {
 567         xfs_inode_t *dp;
 568         struct xfs_buf *bp;
 569         int retval, error, committed, forkoff;
 570
 571         trace_xfs_attr_leaf_addname(args);
 572
 573         /*
 574          * Read the (only) block in the attribute list in.
 575          */
 576         dp = args->dp;
 577         args->blkno = 0;
 578         error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
 579         if (error)
 580                 return error;
 581
 582         /*
 583          * Look up the given attribute in the leaf block.  Figure out if
 584          * the given flags produce an error or call for an atomic rename.
 585          */
 586         retval = xfs_attr3_leaf_lookup_int(bp, args);
 587         if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
 588                 xfs_trans_brelse(args->trans, bp);
 589                 return retval;
 590         } else if (retval == -EEXIST) {
 591                 if (args->flags & ATTR_CREATE) {        /* pure create op */
 592                         xfs_trans_brelse(args->trans, bp);
 593                         return retval;
 594                 }
 595
 596                 trace_xfs_attr_leaf_replace(args);
 597
 598                 /* save the attribute state for later removal*/
 599                 args->op_flags |= XFS_DA_OP_RENAME;     /* an atomic rename */
 600                 args->blkno2 = args->blkno;             /* set 2nd entry info*/
 601                 args->index2 = args->index;
 602                 args->rmtblkno2 = args->rmtblkno;
 603                 args->rmtblkcnt2 = args->rmtblkcnt;
 604                 args->rmtvaluelen2 = args->rmtvaluelen;
 605
 606                 /*
 607                  * clear the remote attr state now that it is saved so that the
 608                  * values reflect the state of the attribute we are about to
 609                  * add, not the attribute we just found and will remove later.
 610                  */
 611                 args->rmtblkno = 0;
 612                 args->rmtblkcnt = 0;
 613                 args->rmtvaluelen = 0;
 614         }
 615
 616         /*
 617          * Add the attribute to the leaf block, transitioning to a Btree
 618          * if required.
 619          */
 620         retval = xfs_attr3_leaf_add(bp, args);
 621         if (retval == -ENOSPC) {
 622                 /*
 623                  * Promote the attribute list to the Btree format, then
 624                  * Commit that transaction so that the node_addname() call
 625                  * can manage its own transactions.
 626                  */
 627                 xfs_bmap_init(args->flist, args->firstblock);
 628                 error = xfs_attr3_leaf_to_node(args);
 629                 if (!error) {
 630                         error = xfs_bmap_finish(&args->trans, args->flist,
 631                                                 &committed);
 632                 }
 633                 if (error) {
 634                         ASSERT(committed);
 635                         args->trans = NULL;
 636                         xfs_bmap_cancel(args->flist);
 637                         return error;
 638                 }
 639
 640                 /*
 641                  * bmap_finish() may have committed the last trans and started
 642                  * a new one.  We need the inode to be in all transactions.
 643                  */
 644                 if (committed)
 645                         xfs_trans_ijoin(args->trans, dp, 0);
 646
 647                 /*
 648                  * Commit the current trans (including the inode) and start
 649                  * a new one.
 650                  */
 651                 error = xfs_trans_roll(&args->trans, dp);
 652                 if (error)
 653                         return error;
 654
 655                 /*
 656                  * Fob the whole rest of the problem off on the Btree code.
 657                  */
 658                 error = xfs_attr_node_addname(args);
 659                 return error;
 660         }
 661
 662         /*
 663          * Commit the transaction that added the attr name so that
 664          * later routines can manage their own transactions.
 665          */
 666         error = xfs_trans_roll(&args->trans, dp);
 667         if (error)
 668                 return error;
 669
 670         /*
 671          * If there was an out-of-line value, allocate the blocks we
 672          * identified for its storage and copy the value.  This is done
 673          * after we create the attribute so that we don't overflow the
 674          * maximum size of a transaction and/or hit a deadlock.
 675          */
 676         if (args->rmtblkno > 0) {
 677                 error = xfs_attr_rmtval_set(args);
 678                 if (error)
 679                         return error;
 680         }
 681
 682         /*
 683          * If this is an atomic rename operation, we must "flip" the
 684          * incomplete flags on the "new" and "old" attribute/value pairs
 685          * so that one disappears and one appears atomically.  Then we
 686          * must remove the "old" attribute/value pair.
 687          */
 688         if (args->op_flags & XFS_DA_OP_RENAME) {
 689                 /*
 690                  * In a separate transaction, set the incomplete flag on the
 691                  * "old" attr and clear the incomplete flag on the "new" attr.
 692                  */
 693                 error = xfs_attr3_leaf_flipflags(args);
 694                 if (error)
 695                         return error;
 696
 697                 /*
 698                  * Dismantle the "old" attribute/value pair by removing
 699                  * a "remote" value (if it exists).
 700                  */
 701                 args->index = args->index2;
 702                 args->blkno = args->blkno2;
 703                 args->rmtblkno = args->rmtblkno2;
 704                 args->rmtblkcnt = args->rmtblkcnt2;
 705                 args->rmtvaluelen = args->rmtvaluelen2;
 706                 if (args->rmtblkno) {
 707                         error = xfs_attr_rmtval_remove(args);
 708                         if (error)
 709                                 return error;
 710                 }
 711
 712                 /*
 713                  * Read in the block containing the "old" attr, then
 714                  * remove the "old" attr from that block (neat, huh!)
 715                  */
 716                 error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno,
 717                                            -1, &bp);
 718                 if (error)
 719                         return error;
 720
 721                 xfs_attr3_leaf_remove(bp, args);
 722
 723                 /*
 724                  * If the result is small enough, shrink it all into the inode.
 725                  */
 726                 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
 727                         xfs_bmap_init(args->flist, args->firstblock);
 728                         error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
 729                         /* bp is gone due to xfs_da_shrink_inode */
 730                         if (!error) {
 731                                 error = xfs_bmap_finish(&args->trans,
 732                                                         args->flist,
 733                                                         &committed);
 734                         }
 735                         if (error) {
 736                                 ASSERT(committed);
 737                                 args->trans = NULL;
 738                                 xfs_bmap_cancel(args->flist);
 739                                 return error;
 740                         }
 741
 742                         /*
 743                          * bmap_finish() may have committed the last trans
 744                          * and started a new one.  We need the inode to be
 745                          * in all transactions.
 746                          */
 747                         if (committed)
 748                                 xfs_trans_ijoin(args->trans, dp, 0);
 749                 }
 750
 751                 /*
 752                  * Commit the remove and start the next trans in series.
 753                  */
 754                 error = xfs_trans_roll(&args->trans, dp);
 755
 756         } else if (args->rmtblkno > 0) {
 757                 /*
 758                  * Added a "remote" value, just clear the incomplete flag.
 759                  */
 760                 error = xfs_attr3_leaf_clearflag(args);
 761         }
 762         return error;
 763 }
 764
 765 /*
 766  * Remove a name from the leaf attribute list structure
 767  *
 768  * This leaf block cannot have a "remote" value, we only call this routine
 769  * if bmap_one_block() says there is only one block (ie: no remote blks).
 770  */
 771 STATIC int
 772 xfs_attr_leaf_removename(xfs_da_args_t *args)
 773 {
 774         xfs_inode_t *dp;
 775         struct xfs_buf *bp;
 776         int error, committed, forkoff;
 777
 778         trace_xfs_attr_leaf_removename(args);
 779
 780         /*
 781          * Remove the attribute.
 782          */
 783         dp = args->dp;
 784         args->blkno = 0;
 785         error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
 786         if (error)
 787                 return error;
 788
 789         error = xfs_attr3_leaf_lookup_int(bp, args);
 790         if (error == -ENOATTR) {
 791                 xfs_trans_brelse(args->trans, bp);
 792                 return error;
 793         }
 794
 795         xfs_attr3_leaf_remove(bp, args);
 796
 797         /*
 798          * If the result is small enough, shrink it all into the inode.
 799          */
 800         if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
 801                 xfs_bmap_init(args->flist, args->firstblock);
 802                 error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
 803                 /* bp is gone due to xfs_da_shrink_inode */
 804                 if (!error) {
 805                         error = xfs_bmap_finish(&args->trans, args->flist,
 806                                                 &committed);
 807                 }
 808                 if (error) {
 809                         ASSERT(committed);
 810                         args->trans = NULL;
 811                         xfs_bmap_cancel(args->flist);
 812                         return error;
 813                 }
 814
 815                 /*
 816                  * bmap_finish() may have committed the last trans and started
 817                  * a new one.  We need the inode to be in all transactions.
 818                  */
 819                 if (committed)
 820                         xfs_trans_ijoin(args->trans, dp, 0);
 821         }
 822         return 0;
 823 }
 824
 825 /*
 826  * Look up a name in a leaf attribute list structure.
 827  *
 828  * This leaf block cannot have a "remote" value, we only call this routine
 829  * if bmap_one_block() says there is only one block (ie: no remote blks).
 830  */
 831 STATIC int
 832 xfs_attr_leaf_get(xfs_da_args_t *args)
 833 {
 834         struct xfs_buf *bp;
 835         int error;
 836
 837         trace_xfs_attr_leaf_get(args);
 838
 839         args->blkno = 0;
 840         error = xfs_attr3_leaf_read(args->trans, args->dp, args->blkno, -1, &bp);
 841         if (error)
 842                 return error;
 843
 844         error = xfs_attr3_leaf_lookup_int(bp, args);
 845         if (error != -EEXIST)  {
 846                 xfs_trans_brelse(args->trans, bp);
 847                 return error;
 848         }
 849         error = xfs_attr3_leaf_getvalue(bp, args);
 850         xfs_trans_brelse(args->trans, bp);
 851         if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
 852                 error = xfs_attr_rmtval_get(args);
 853         }
 854         return error;
 855 }
 856
 857 /*========================================================================
 858  * External routines when attribute list size > geo->blksize
 859  *========================================================================*/
 860
 861 /*
 862  * Add a name to a Btree-format attribute list.
 863  *
 864  * This will involve walking down the Btree, and may involve splitting
 865  * leaf nodes and even splitting intermediate nodes up to and including
 866  * the root node (a special case of an intermediate node).
 867  *
 868  * "Remote" attribute values confuse the issue and atomic rename operations
 869  * add a whole extra layer of confusion on top of that.
 870  */
 871 STATIC int
 872 xfs_attr_node_addname(xfs_da_args_t *args)
 873 {
 874         xfs_da_state_t *state;
 875         xfs_da_state_blk_t *blk;
 876         xfs_inode_t *dp;
 877         xfs_mount_t *mp;
 878         int committed, retval, error;
 879
 880         trace_xfs_attr_node_addname(args);
 881
 882         /*
 883          * Fill in bucket of arguments/results/context to carry around.
 884          */
 885         dp = args->dp;
 886         mp = dp->i_mount;
 887 restart:
 888         state = xfs_da_state_alloc();
 889         state->args = args;
 890         state->mp = mp;
 891
 892         /*
 893          * Search to see if name already exists, and get back a pointer
 894          * to where it should go.
 895          */
 896         error = xfs_da3_node_lookup_int(state, &retval);
 897         if (error)
 898                 goto out;
 899         blk = &state->path.blk[ state->path.active-1 ];
 900         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
 901         if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
 902                 goto out;
 903         } else if (retval == -EEXIST) {
 904                 if (args->flags & ATTR_CREATE)
 905                         goto out;
 906
 907                 trace_xfs_attr_node_replace(args);
 908
 909                 /* save the attribute state for later removal*/
 910                 args->op_flags |= XFS_DA_OP_RENAME;     /* atomic rename op */
 911                 args->blkno2 = args->blkno;             /* set 2nd entry info*/
 912                 args->index2 = args->index;
 913                 args->rmtblkno2 = args->rmtblkno;
 914                 args->rmtblkcnt2 = args->rmtblkcnt;
 915                 args->rmtvaluelen2 = args->rmtvaluelen;
 916
 917                 /*
 918                  * clear the remote attr state now that it is saved so that the
 919                  * values reflect the state of the attribute we are about to
 920                  * add, not the attribute we just found and will remove later.
 921                  */
 922                 args->rmtblkno = 0;
 923                 args->rmtblkcnt = 0;
 924                 args->rmtvaluelen = 0;
 925         }
 926
 927         retval = xfs_attr3_leaf_add(blk->bp, state->args);
 928         if (retval == -ENOSPC) {
 929                 if (state->path.active == 1) {
 930                         /*
 931                          * Its really a single leaf node, but it had
 932                          * out-of-line values so it looked like it *might*
 933                          * have been a b-tree.
 934                          */
 935                         xfs_da_state_free(state);
 936                         state = NULL;
 937                         xfs_bmap_init(args->flist, args->firstblock);
 938                         error = xfs_attr3_leaf_to_node(args);
 939                         if (!error) {
 940                                 error = xfs_bmap_finish(&args->trans,
 941                                                         args->flist,
 942                                                         &committed);
 943                         }
 944                         if (error) {
 945                                 ASSERT(committed);
 946                                 args->trans = NULL;
 947                                 xfs_bmap_cancel(args->flist);
 948                                 goto out;
 949                         }
 950
 951                         /*
 952                          * bmap_finish() may have committed the last trans
 953                          * and started a new one.  We need the inode to be
 954                          * in all transactions.
 955                          */
 956                         if (committed)
 957                                 xfs_trans_ijoin(args->trans, dp, 0);
 958
 959                         /*
 960                          * Commit the node conversion and start the next
 961                          * trans in the chain.
 962                          */
 963                         error = xfs_trans_roll(&args->trans, dp);
 964                         if (error)
 965                                 goto out;
 966
 967                         goto restart;
 968                 }
 969
 970                 /*
 971                  * Split as many Btree elements as required.
 972                  * This code tracks the new and old attr's location
 973                  * in the index/blkno/rmtblkno/rmtblkcnt fields and
 974                  * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
 975                  */
 976                 xfs_bmap_init(args->flist, args->firstblock);
 977                 error = xfs_da3_split(state);
 978                 if (!error) {
 979                         error = xfs_bmap_finish(&args->trans, args->flist,
 980                                                 &committed);
 981                 }
 982                 if (error) {
 983                         ASSERT(committed);
 984                         args->trans = NULL;
 985                         xfs_bmap_cancel(args->flist);
 986                         goto out;
 987                 }
 988
 989                 /*
 990                  * bmap_finish() may have committed the last trans and started
 991                  * a new one.  We need the inode to be in all transactions.
 992                  */
 993                 if (committed)
 994                         xfs_trans_ijoin(args->trans, dp, 0);
 995         } else {
 996                 /*
 997                  * Addition succeeded, update Btree hashvals.
 998                  */
 999                 xfs_da3_fixhashpath(state, &state->path);
1000         }
1001
1002         /*
1003          * Kill the state structure, we're done with it and need to
1004          * allow the buffers to come back later.
1005          */
1006         xfs_da_state_free(state);
1007         state = NULL;
1008
1009         /*
1010          * Commit the leaf addition or btree split and start the next
1011          * trans in the chain.
1012          */
1013         error = xfs_trans_roll(&args->trans, dp);
1014         if (error)
1015                 goto out;
1016
1017         /*
1018          * If there was an out-of-line value, allocate the blocks we
1019          * identified for its storage and copy the value.  This is done
1020          * after we create the attribute so that we don't overflow the
1021          * maximum size of a transaction and/or hit a deadlock.
1022          */
1023         if (args->rmtblkno > 0) {
1024                 error = xfs_attr_rmtval_set(args);
1025                 if (error)
1026                         return error;
1027         }
1028
1029         /*
1030          * If this is an atomic rename operation, we must "flip" the
1031          * incomplete flags on the "new" and "old" attribute/value pairs
1032          * so that one disappears and one appears atomically.  Then we
1033          * must remove the "old" attribute/value pair.
1034          */
1035         if (args->op_flags & XFS_DA_OP_RENAME) {
1036                 /*
1037                  * In a separate transaction, set the incomplete flag on the
1038                  * "old" attr and clear the incomplete flag on the "new" attr.
1039                  */
1040                 error = xfs_attr3_leaf_flipflags(args);
1041                 if (error)
1042                         goto out;
1043
1044                 /*
1045                  * Dismantle the "old" attribute/value pair by removing
1046                  * a "remote" value (if it exists).
1047                  */
1048                 args->index = args->index2;
1049                 args->blkno = args->blkno2;
1050                 args->rmtblkno = args->rmtblkno2;
1051                 args->rmtblkcnt = args->rmtblkcnt2;
1052                 args->rmtvaluelen = args->rmtvaluelen2;
1053                 if (args->rmtblkno) {
1054                         error = xfs_attr_rmtval_remove(args);
1055                         if (error)
1056                                 return error;
1057                 }
1058
1059                 /*
1060                  * Re-find the "old" attribute entry after any split ops.
1061                  * The INCOMPLETE flag means that we will find the "old"
1062                  * attr, not the "new" one.
1063                  */
1064                 args->flags |= XFS_ATTR_INCOMPLETE;
1065                 state = xfs_da_state_alloc();
1066                 state->args = args;
1067                 state->mp = mp;
1068                 state->inleaf = 0;
1069                 error = xfs_da3_node_lookup_int(state, &retval);
1070                 if (error)
1071                         goto out;
1072
1073                 /*
1074                  * Remove the name and update the hashvals in the tree.
1075                  */
1076                 blk = &state->path.blk[ state->path.active-1 ];
1077                 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1078                 error = xfs_attr3_leaf_remove(blk->bp, args);
1079                 xfs_da3_fixhashpath(state, &state->path);
1080
1081                 /*
1082                  * Check to see if the tree needs to be collapsed.
1083                  */
1084                 if (retval && (state->path.active > 1)) {
1085                         xfs_bmap_init(args->flist, args->firstblock);
1086                         error = xfs_da3_join(state);
1087                         if (!error) {
1088                                 error = xfs_bmap_finish(&args->trans,
1089                                                         args->flist,
1090                                                         &committed);
1091                         }
1092                         if (error) {
1093                                 ASSERT(committed);
1094                                 args->trans = NULL;
1095                                 xfs_bmap_cancel(args->flist);
1096                                 goto out;
1097                         }
1098
1099                         /*
1100                          * bmap_finish() may have committed the last trans
1101                          * and started a new one.  We need the inode to be
1102                          * in all transactions.
1103                          */
1104                         if (committed)
1105                                 xfs_trans_ijoin(args->trans, dp, 0);
1106                 }
1107
1108                 /*
1109                  * Commit and start the next trans in the chain.
1110                  */
1111                 error = xfs_trans_roll(&args->trans, dp);
1112                 if (error)
1113                         goto out;
1114
1115         } else if (args->rmtblkno > 0) {
1116                 /*
1117                  * Added a "remote" value, just clear the incomplete flag.
1118                  */
1119                 error = xfs_attr3_leaf_clearflag(args);
1120                 if (error)
1121                         goto out;
1122         }
1123         retval = error = 0;
1124
1125 out:
1126         if (state)
1127                 xfs_da_state_free(state);
1128         if (error)
1129                 return error;
1130         return retval;
1131 }
1132
1133 /*
1134  * Remove a name from a B-tree attribute list.
1135  *
1136  * This will involve walking down the Btree, and may involve joining
1137  * leaf nodes and even joining intermediate nodes up to and including
1138  * the root node (a special case of an intermediate node).
1139  */
1140 STATIC int
1141 xfs_attr_node_removename(xfs_da_args_t *args)
1142 {
1143         xfs_da_state_t *state;
1144         xfs_da_state_blk_t *blk;
1145         xfs_inode_t *dp;
1146         struct xfs_buf *bp;
1147         int retval, error, committed, forkoff;
1148
1149         trace_xfs_attr_node_removename(args);
1150
1151         /*
1152          * Tie a string around our finger to remind us where we are.
1153          */
1154         dp = args->dp;
1155         state = xfs_da_state_alloc();
1156         state->args = args;
1157         state->mp = dp->i_mount;
1158
1159         /*
1160          * Search to see if name exists, and get back a pointer to it.
1161          */
1162         error = xfs_da3_node_lookup_int(state, &retval);
1163         if (error || (retval != -EEXIST)) {
1164                 if (error == 0)
1165                         error = retval;
1166                 goto out;
1167         }
1168
1169         /*
1170          * If there is an out-of-line value, de-allocate the blocks.
1171          * This is done before we remove the attribute so that we don't
1172          * overflow the maximum size of a transaction and/or hit a deadlock.
1173          */
1174         blk = &state->path.blk[ state->path.active-1 ];
1175         ASSERT(blk->bp != NULL);
1176         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1177         if (args->rmtblkno > 0) {
1178                 /*
1179                  * Fill in disk block numbers in the state structure
1180                  * so that we can get the buffers back after we commit
1181                  * several transactions in the following calls.
1182                  */
1183                 error = xfs_attr_fillstate(state);
1184                 if (error)
1185                         goto out;
1186
1187                 /*
1188                  * Mark the attribute as INCOMPLETE, then bunmapi() the
1189                  * remote value.
1190                  */
1191                 error = xfs_attr3_leaf_setflag(args);
1192                 if (error)
1193                         goto out;
1194                 error = xfs_attr_rmtval_remove(args);
1195                 if (error)
1196                         goto out;
1197
1198                 /*
1199                  * Refill the state structure with buffers, the prior calls
1200                  * released our buffers.
1201                  */
1202                 error = xfs_attr_refillstate(state);
1203                 if (error)
1204                         goto out;
1205         }
1206
1207         /*
1208          * Remove the name and update the hashvals in the tree.
1209          */
1210         blk = &state->path.blk[ state->path.active-1 ];
1211         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1212         retval = xfs_attr3_leaf_remove(blk->bp, args);
1213         xfs_da3_fixhashpath(state, &state->path);
1214
1215         /*
1216          * Check to see if the tree needs to be collapsed.
1217          */
1218         if (retval && (state->path.active > 1)) {
1219                 xfs_bmap_init(args->flist, args->firstblock);
1220                 error = xfs_da3_join(state);
1221                 if (!error) {
1222                         error = xfs_bmap_finish(&args->trans, args->flist,
1223                                                 &committed);
1224                 }
1225                 if (error) {
1226                         ASSERT(committed);
1227                         args->trans = NULL;
1228                         xfs_bmap_cancel(args->flist);
1229                         goto out;
1230                 }
1231
1232                 /*
1233                  * bmap_finish() may have committed the last trans and started
1234                  * a new one.  We need the inode to be in all transactions.
1235                  */
1236                 if (committed)
1237                         xfs_trans_ijoin(args->trans, dp, 0);
1238
1239                 /*
1240                  * Commit the Btree join operation and start a new trans.
1241                  */
1242                 error = xfs_trans_roll(&args->trans, dp);
1243                 if (error)
1244                         goto out;
1245         }
1246
1247         /*
1248          * If the result is small enough, push it all into the inode.
1249          */
1250         if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1251                 /*
1252                  * Have to get rid of the copy of this dabuf in the state.
1253                  */
1254                 ASSERT(state->path.active == 1);
1255                 ASSERT(state->path.blk[0].bp);
1256                 state->path.blk[0].bp = NULL;
1257
1258                 error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
1259                 if (error)
1260                         goto out;
1261
1262                 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1263                         xfs_bmap_init(args->flist, args->firstblock);
1264                         error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
1265                         /* bp is gone due to xfs_da_shrink_inode */
1266                         if (!error) {
1267                                 error = xfs_bmap_finish(&args->trans,
1268                                                         args->flist,
1269                                                         &committed);
1270                         }
1271                         if (error) {
1272                                 ASSERT(committed);
1273                                 args->trans = NULL;
1274                                 xfs_bmap_cancel(args->flist);
1275                                 goto out;
1276                         }
1277
1278                         /*
1279                          * bmap_finish() may have committed the last trans
1280                          * and started a new one.  We need the inode to be
1281                          * in all transactions.
1282                          */
1283                         if (committed)
1284                                 xfs_trans_ijoin(args->trans, dp, 0);
1285                 } else
1286                         xfs_trans_brelse(args->trans, bp);
1287         }
1288         error = 0;
1289
1290 out:
1291         xfs_da_state_free(state);
1292         return error;
1293 }
1294
1295 /*
1296  * Fill in the disk block numbers in the state structure for the buffers
1297  * that are attached to the state structure.
1298  * This is done so that we can quickly reattach ourselves to those buffers
1299  * after some set of transaction commits have released these buffers.
1300  */
1301 STATIC int
1302 xfs_attr_fillstate(xfs_da_state_t *state)
1303 {
1304         xfs_da_state_path_t *path;
1305         xfs_da_state_blk_t *blk;
1306         int level;
1307
1308         trace_xfs_attr_fillstate(state->args);
1309
1310         /*
1311          * Roll down the "path" in the state structure, storing the on-disk
1312          * block number for those buffers in the "path".
1313          */
1314         path = &state->path;
1315         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1316         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1317                 if (blk->bp) {
1318                         blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1319                         blk->bp = NULL;
1320                 } else {
1321                         blk->disk_blkno = 0;
1322                 }
1323         }
1324
1325         /*
1326          * Roll down the "altpath" in the state structure, storing the on-disk
1327          * block number for those buffers in the "altpath".
1328          */
1329         path = &state->altpath;
1330         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1331         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1332                 if (blk->bp) {
1333                         blk->disk_blkno = XFS_BUF_ADDR(blk->bp);
1334                         blk->bp = NULL;
1335                 } else {
1336                         blk->disk_blkno = 0;
1337                 }
1338         }
1339
1340         return 0;
1341 }
1342
1343 /*
1344  * Reattach the buffers to the state structure based on the disk block
1345  * numbers stored in the state structure.
1346  * This is done after some set of transaction commits have released those
1347  * buffers from our grip.
1348  */
1349 STATIC int
1350 xfs_attr_refillstate(xfs_da_state_t *state)
1351 {
1352         xfs_da_state_path_t *path;
1353         xfs_da_state_blk_t *blk;
1354         int level, error;
1355
1356         trace_xfs_attr_refillstate(state->args);
1357
1358         /*
1359          * Roll down the "path" in the state structure, storing the on-disk
1360          * block number for those buffers in the "path".
1361          */
1362         path = &state->path;
1363         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1364         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1365                 if (blk->disk_blkno) {
1366                         error = xfs_da3_node_read(state->args->trans,
1367                                                 state->args->dp,
1368                                                 blk->blkno, blk->disk_blkno,
1369                                                 &blk->bp, XFS_ATTR_FORK);
1370                         if (error)
1371                                 return error;
1372                 } else {
1373                         blk->bp = NULL;
1374                 }
1375         }
1376
1377         /*
1378          * Roll down the "altpath" in the state structure, storing the on-disk
1379          * block number for those buffers in the "altpath".
1380          */
1381         path = &state->altpath;
1382         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1383         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1384                 if (blk->disk_blkno) {
1385                         error = xfs_da3_node_read(state->args->trans,
1386                                                 state->args->dp,
1387                                                 blk->blkno, blk->disk_blkno,
1388                                                 &blk->bp, XFS_ATTR_FORK);
1389                         if (error)
1390                                 return error;
1391                 } else {
1392                         blk->bp = NULL;
1393                 }
1394         }
1395
1396         return 0;
1397 }
1398
1399 /*
1400  * Look up a filename in a node attribute list.
1401  *
1402  * This routine gets called for any attribute fork that has more than one
1403  * block, ie: both true Btree attr lists and for single-leaf-blocks with
1404  * "remote" values taking up more blocks.
1405  */
1406 STATIC int
1407 xfs_attr_node_get(xfs_da_args_t *args)
1408 {
1409         xfs_da_state_t *state;
1410         xfs_da_state_blk_t *blk;
1411         int error, retval;
1412         int i;
1413
1414         trace_xfs_attr_node_get(args);
1415
1416         state = xfs_da_state_alloc();
1417         state->args = args;
1418         state->mp = args->dp->i_mount;
1419
1420         /*
1421          * Search to see if name exists, and get back a pointer to it.
1422          */
1423         error = xfs_da3_node_lookup_int(state, &retval);
1424         if (error) {
1425                 retval = error;
1426         } else if (retval == -EEXIST) {
1427                 blk = &state->path.blk[ state->path.active-1 ];
1428                 ASSERT(blk->bp != NULL);
1429                 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1430
1431                 /*
1432                  * Get the value, local or "remote"
1433                  */
1434                 retval = xfs_attr3_leaf_getvalue(blk->bp, args);
1435                 if (!retval && (args->rmtblkno > 0)
1436                     && !(args->flags & ATTR_KERNOVAL)) {
1437                         retval = xfs_attr_rmtval_get(args);
1438                 }
1439         }
1440
1441         /*
1442          * If not in a transaction, we have to release all the buffers.
1443          */
1444         for (i = 0; i < state->path.active; i++) {
1445                 xfs_trans_brelse(args->trans, state->path.blk[i].bp);
1446                 state->path.blk[i].bp = NULL;
1447         }
1448
1449         xfs_da_state_free(state);
1450         return retval;
1451 }