fs/xfs/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
  19 #include <linux/capability.h>
  20
  21 #include "xfs.h"
  22 #include "xfs_fs.h"
  23 #include "xfs_types.h"
  24 #include "xfs_bit.h"
  25 #include "xfs_log.h"
  26 #include "xfs_inum.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_sb.h"
  29 #include "xfs_ag.h"
  30 #include "xfs_dir.h"
  31 #include "xfs_dir2.h"
  32 #include "xfs_dmapi.h"
  33 #include "xfs_mount.h"
  34 #include "xfs_da_btree.h"
  35 #include "xfs_bmap_btree.h"
  36 #include "xfs_alloc_btree.h"
  37 #include "xfs_ialloc_btree.h"
  38 #include "xfs_dir_sf.h"
  39 #include "xfs_dir2_sf.h"
  40 #include "xfs_attr_sf.h"
  41 #include "xfs_dinode.h"
  42 #include "xfs_inode.h"
  43 #include "xfs_alloc.h"
  44 #include "xfs_btree.h"
  45 #include "xfs_inode_item.h"
  46 #include "xfs_bmap.h"
  47 #include "xfs_attr.h"
  48 #include "xfs_attr_leaf.h"
  49 #include "xfs_error.h"
  50 #include "xfs_quota.h"
  51 #include "xfs_trans_space.h"
  52 #include "xfs_acl.h"
  53 #include "xfs_rw.h"
  54
  55 /*
  56  * xfs_attr.c
  57  *
  58  * Provide the external interfaces to manage attribute lists.
  59  */
  60
  61 #define ATTR_SYSCOUNT   2
  62 STATIC struct attrnames posix_acl_access;
  63 STATIC struct attrnames posix_acl_default;
  64 STATIC struct attrnames *attr_system_names[ATTR_SYSCOUNT];
  65
  66 /*========================================================================
  67  * Function prototypes for the kernel.
  68  *========================================================================*/
  69
  70 /*
  71  * Internal routines when attribute list fits inside the inode.
  72  */
  73 STATIC int xfs_attr_shortform_addname(xfs_da_args_t *args);
  74
  75 /*
  76  * Internal routines when attribute list is one block.
  77  */
  78 STATIC int xfs_attr_leaf_get(xfs_da_args_t *args);
  79 STATIC int xfs_attr_leaf_addname(xfs_da_args_t *args);
  80 STATIC int xfs_attr_leaf_removename(xfs_da_args_t *args);
  81 STATIC int xfs_attr_leaf_list(xfs_attr_list_context_t *context);
  82
  83 /*
  84  * Internal routines when attribute list is more than one block.
  85  */
  86 STATIC int xfs_attr_node_get(xfs_da_args_t *args);
  87 STATIC int xfs_attr_node_addname(xfs_da_args_t *args);
  88 STATIC int xfs_attr_node_removename(xfs_da_args_t *args);
  89 STATIC int xfs_attr_node_list(xfs_attr_list_context_t *context);
  90 STATIC int xfs_attr_fillstate(xfs_da_state_t *state);
  91 STATIC int xfs_attr_refillstate(xfs_da_state_t *state);
  92
  93 /*
  94  * Routines to manipulate out-of-line attribute values.
  95  */
  96 STATIC int xfs_attr_rmtval_get(xfs_da_args_t *args);
  97 STATIC int xfs_attr_rmtval_set(xfs_da_args_t *args);
  98 STATIC int xfs_attr_rmtval_remove(xfs_da_args_t *args);
  99
 100 #define ATTR_RMTVALUE_MAPSIZE   1       /* # of map entries at once */
 101
 102 #if defined(XFS_ATTR_TRACE)
 103 ktrace_t *xfs_attr_trace_buf;
 104 #endif
 105
 106
 107 /*========================================================================
 108  * Overall external interface routines.
 109  *========================================================================*/
 110
 111 int
 112 xfs_attr_fetch(xfs_inode_t *ip, const char *name, int namelen,
 113                char *value, int *valuelenp, int flags, struct cred *cred)
 114 {
 115         xfs_da_args_t   args;
 116         int             error;
 117
 118         if ((XFS_IFORK_Q(ip) == 0) ||
 119             (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 120              ip->i_d.di_anextents == 0))
 121                 return(ENOATTR);
 122
 123         /*
 124          * Fill in the arg structure for this request.
 125          */
 126         memset((char *)&args, 0, sizeof(args));
 127         args.name = name;
 128         args.namelen = namelen;
 129         args.value = value;
 130         args.valuelen = *valuelenp;
 131         args.flags = flags;
 132         args.hashval = xfs_da_hashname(args.name, args.namelen);
 133         args.dp = ip;
 134         args.whichfork = XFS_ATTR_FORK;
 135
 136         /*
 137          * Decide on what work routines to call based on the inode size.
 138          */
 139         if (XFS_IFORK_Q(ip) == 0 ||
 140             (ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 141              ip->i_d.di_anextents == 0)) {
 142                 error = XFS_ERROR(ENOATTR);
 143         } else if (ip->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
 144                 error = xfs_attr_shortform_getvalue(&args);
 145         } else if (xfs_bmap_one_block(ip, XFS_ATTR_FORK)) {
 146                 error = xfs_attr_leaf_get(&args);
 147         } else {
 148                 error = xfs_attr_node_get(&args);
 149         }
 150
 151         /*
 152          * Return the number of bytes in the value to the caller.
 153          */
 154         *valuelenp = args.valuelen;
 155
 156         if (error == EEXIST)
 157                 error = 0;
 158         return(error);
 159 }
 160
 161 int
 162 xfs_attr_get(bhv_desc_t *bdp, const char *name, char *value, int *valuelenp,
 163              int flags, struct cred *cred)
 164 {
 165         xfs_inode_t     *ip = XFS_BHVTOI(bdp);
 166         int             error, namelen;
 167
 168         XFS_STATS_INC(xs_attr_get);
 169
 170         if (!name)
 171                 return(EINVAL);
 172         namelen = strlen(name);
 173         if (namelen >= MAXNAMELEN)
 174                 return(EFAULT);         /* match IRIX behaviour */
 175
 176         if (XFS_FORCED_SHUTDOWN(ip->i_mount))
 177                 return(EIO);
 178
 179         xfs_ilock(ip, XFS_ILOCK_SHARED);
 180         error = xfs_attr_fetch(ip, name, namelen, value, valuelenp, flags, cred);
 181         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 182         return(error);
 183 }
 184
 185 STATIC int
 186 xfs_attr_set_int(xfs_inode_t *dp, const char *name, int namelen,
 187                  char *value, int valuelen, int flags)
 188 {
 189         xfs_da_args_t   args;
 190         xfs_fsblock_t   firstblock;
 191         xfs_bmap_free_t flist;
 192         int             error, err2, committed;
 193         int             local, size;
 194         uint            nblks;
 195         xfs_mount_t     *mp = dp->i_mount;
 196         int             rsvd = (flags & ATTR_ROOT) != 0;
 197
 198         /*
 199          * Attach the dquots to the inode.
 200          */
 201         if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
 202                 return (error);
 203
 204         /*
 205          * Determine space new attribute will use, and if it would be
 206          * "local" or "remote" (note: local != inline).
 207          */
 208         size = xfs_attr_leaf_newentsize(namelen, valuelen,
 209                                         mp->m_sb.sb_blocksize, &local);
 210
 211         /*
 212          * If the inode doesn't have an attribute fork, add one.
 213          * (inode must not be locked when we call this routine)
 214          */
 215         if (XFS_IFORK_Q(dp) == 0) {
 216                 if ((error = xfs_bmap_add_attrfork(dp, size, rsvd)))
 217                         return(error);
 218         }
 219
 220         /*
 221          * Fill in the arg structure for this request.
 222          */
 223         memset((char *)&args, 0, sizeof(args));
 224         args.name = name;
 225         args.namelen = namelen;
 226         args.value = value;
 227         args.valuelen = valuelen;
 228         args.flags = flags;
 229         args.hashval = xfs_da_hashname(args.name, args.namelen);
 230         args.dp = dp;
 231         args.firstblock = &firstblock;
 232         args.flist = &flist;
 233         args.whichfork = XFS_ATTR_FORK;
 234         args.addname = 1;
 235         args.oknoent = 1;
 236
 237         nblks = XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK);
 238         if (local) {
 239                 if (size > (mp->m_sb.sb_blocksize >> 1)) {
 240                         /* Double split possible */
 241                         nblks <<= 1;
 242                 }
 243         } else {
 244                 uint    dblocks = XFS_B_TO_FSB(mp, valuelen);
 245                 /* Out of line attribute, cannot double split, but make
 246                  * room for the attribute value itself.
 247                  */
 248                 nblks += dblocks;
 249                 nblks += XFS_NEXTENTADD_SPACE_RES(mp, dblocks, XFS_ATTR_FORK);
 250         }
 251
 252         /* Size is now blocks for attribute data */
 253         args.total = nblks;
 254
 255         /*
 256          * Start our first transaction of the day.
 257          *
 258          * All future transactions during this code must be "chained" off
 259          * this one via the trans_dup() call.  All transactions will contain
 260          * the inode, and the inode will always be marked with trans_ihold().
 261          * Since the inode will be locked in all transactions, we must log
 262          * the inode in every transaction to let it float upward through
 263          * the log.
 264          */
 265         args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_SET);
 266
 267         /*
 268          * Root fork attributes can use reserved data blocks for this
 269          * operation if necessary
 270          */
 271
 272         if (rsvd)
 273                 args.trans->t_flags |= XFS_TRANS_RESERVE;
 274
 275         if ((error = xfs_trans_reserve(args.trans, (uint) nblks,
 276                                       XFS_ATTRSET_LOG_RES(mp, nblks),
 277                                       0, XFS_TRANS_PERM_LOG_RES,
 278                                       XFS_ATTRSET_LOG_COUNT))) {
 279                 xfs_trans_cancel(args.trans, 0);
 280                 return(error);
 281         }
 282         xfs_ilock(dp, XFS_ILOCK_EXCL);
 283
 284         error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, args.trans, dp, nblks, 0,
 285                          rsvd ? XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
 286                                 XFS_QMOPT_RES_REGBLKS);
 287         if (error) {
 288                 xfs_iunlock(dp, XFS_ILOCK_EXCL);
 289                 xfs_trans_cancel(args.trans, XFS_TRANS_RELEASE_LOG_RES);
 290                 return (error);
 291         }
 292
 293         xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
 294         xfs_trans_ihold(args.trans, dp);
 295
 296         /*
 297          * If the attribute list is non-existant or a shortform list,
 298          * upgrade it to a single-leaf-block attribute list.
 299          */
 300         if ((dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
 301             ((dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) &&
 302              (dp->i_d.di_anextents == 0))) {
 303
 304                 /*
 305                  * Build initial attribute list (if required).
 306                  */
 307                 if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS)
 308                         xfs_attr_shortform_create(&args);
 309
 310                 /*
 311                  * Try to add the attr to the attribute list in
 312                  * the inode.
 313                  */
 314                 error = xfs_attr_shortform_addname(&args);
 315                 if (error != ENOSPC) {
 316                         /*
 317                          * Commit the shortform mods, and we're done.
 318                          * NOTE: this is also the error path (EEXIST, etc).
 319                          */
 320                         ASSERT(args.trans != NULL);
 321
 322                         /*
 323                          * If this is a synchronous mount, make sure that
 324                          * the transaction goes to disk before returning
 325                          * to the user.
 326                          */
 327                         if (mp->m_flags & XFS_MOUNT_WSYNC) {
 328                                 xfs_trans_set_sync(args.trans);
 329                         }
 330                         err2 = xfs_trans_commit(args.trans,
 331                                                  XFS_TRANS_RELEASE_LOG_RES,
 332                                                  NULL);
 333                         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 334
 335                         /*
 336                          * Hit the inode change time.
 337                          */
 338                         if (!error && (flags & ATTR_KERNOTIME) == 0) {
 339                                 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
 340                         }
 341                         return(error == 0 ? err2 : error);
 342                 }
 343
 344                 /*
 345                  * It won't fit in the shortform, transform to a leaf block.
 346                  * GROT: another possible req'mt for a double-split btree op.
 347                  */
 348                 XFS_BMAP_INIT(args.flist, args.firstblock);
 349                 error = xfs_attr_shortform_to_leaf(&args);
 350                 if (!error) {
 351                         error = xfs_bmap_finish(&args.trans, args.flist,
 352                                                 *args.firstblock, &committed);
 353                 }
 354                 if (error) {
 355                         ASSERT(committed);
 356                         args.trans = NULL;
 357                         xfs_bmap_cancel(&flist);
 358                         goto out;
 359                 }
 360
 361                 /*
 362                  * bmap_finish() may have committed the last trans and started
 363                  * a new one.  We need the inode to be in all transactions.
 364                  */
 365                 if (committed) {
 366                         xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
 367                         xfs_trans_ihold(args.trans, dp);
 368                 }
 369
 370                 /*
 371                  * Commit the leaf transformation.  We'll need another (linked)
 372                  * transaction to add the new attribute to the leaf.
 373                  */
 374                 if ((error = xfs_attr_rolltrans(&args.trans, dp)))
 375                         goto out;
 376
 377         }
 378
 379         if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
 380                 error = xfs_attr_leaf_addname(&args);
 381         } else {
 382                 error = xfs_attr_node_addname(&args);
 383         }
 384         if (error) {
 385                 goto out;
 386         }
 387
 388         /*
 389          * If this is a synchronous mount, make sure that the
 390          * transaction goes to disk before returning to the user.
 391          */
 392         if (mp->m_flags & XFS_MOUNT_WSYNC) {
 393                 xfs_trans_set_sync(args.trans);
 394         }
 395
 396         /*
 397          * Commit the last in the sequence of transactions.
 398          */
 399         xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 400         error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
 401                                  NULL);
 402         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 403
 404         /*
 405          * Hit the inode change time.
 406          */
 407         if (!error && (flags & ATTR_KERNOTIME) == 0) {
 408                 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
 409         }
 410
 411         return(error);
 412
 413 out:
 414         if (args.trans)
 415                 xfs_trans_cancel(args.trans,
 416                         XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
 417         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 418         return(error);
 419 }
 420
 421 int
 422 xfs_attr_set(bhv_desc_t *bdp, const char *name, char *value, int valuelen, int flags,
 423              struct cred *cred)
 424 {
 425         xfs_inode_t     *dp;
 426         int             namelen;
 427
 428         namelen = strlen(name);
 429         if (namelen >= MAXNAMELEN)
 430                 return EFAULT;          /* match IRIX behaviour */
 431
 432         XFS_STATS_INC(xs_attr_set);
 433
 434         dp = XFS_BHVTOI(bdp);
 435         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 436                 return (EIO);
 437
 438         return xfs_attr_set_int(dp, name, namelen, value, valuelen, flags);
 439 }
 440
 441 /*
 442  * Generic handler routine to remove a name from an attribute list.
 443  * Transitions attribute list from Btree to shortform as necessary.
 444  */
 445 STATIC int
 446 xfs_attr_remove_int(xfs_inode_t *dp, const char *name, int namelen, int flags)
 447 {
 448         xfs_da_args_t   args;
 449         xfs_fsblock_t   firstblock;
 450         xfs_bmap_free_t flist;
 451         int             error;
 452         xfs_mount_t     *mp = dp->i_mount;
 453
 454         /*
 455          * Fill in the arg structure for this request.
 456          */
 457         memset((char *)&args, 0, sizeof(args));
 458         args.name = name;
 459         args.namelen = namelen;
 460         args.flags = flags;
 461         args.hashval = xfs_da_hashname(args.name, args.namelen);
 462         args.dp = dp;
 463         args.firstblock = &firstblock;
 464         args.flist = &flist;
 465         args.total = 0;
 466         args.whichfork = XFS_ATTR_FORK;
 467
 468         /*
 469          * Attach the dquots to the inode.
 470          */
 471         if ((error = XFS_QM_DQATTACH(mp, dp, 0)))
 472                 return (error);
 473
 474         /*
 475          * Start our first transaction of the day.
 476          *
 477          * All future transactions during this code must be "chained" off
 478          * this one via the trans_dup() call.  All transactions will contain
 479          * the inode, and the inode will always be marked with trans_ihold().
 480          * Since the inode will be locked in all transactions, we must log
 481          * the inode in every transaction to let it float upward through
 482          * the log.
 483          */
 484         args.trans = xfs_trans_alloc(mp, XFS_TRANS_ATTR_RM);
 485
 486         /*
 487          * Root fork attributes can use reserved data blocks for this
 488          * operation if necessary
 489          */
 490
 491         if (flags & ATTR_ROOT)
 492                 args.trans->t_flags |= XFS_TRANS_RESERVE;
 493
 494         if ((error = xfs_trans_reserve(args.trans,
 495                                       XFS_ATTRRM_SPACE_RES(mp),
 496                                       XFS_ATTRRM_LOG_RES(mp),
 497                                       0, XFS_TRANS_PERM_LOG_RES,
 498                                       XFS_ATTRRM_LOG_COUNT))) {
 499                 xfs_trans_cancel(args.trans, 0);
 500                 return(error);
 501         }
 502
 503         xfs_ilock(dp, XFS_ILOCK_EXCL);
 504         /*
 505          * No need to make quota reservations here. We expect to release some
 506          * blocks not allocate in the common case.
 507          */
 508         xfs_trans_ijoin(args.trans, dp, XFS_ILOCK_EXCL);
 509         xfs_trans_ihold(args.trans, dp);
 510
 511         /*
 512          * Decide on what work routines to call based on the inode size.
 513          */
 514         if (XFS_IFORK_Q(dp) == 0 ||
 515             (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 516              dp->i_d.di_anextents == 0)) {
 517                 error = XFS_ERROR(ENOATTR);
 518                 goto out;
 519         }
 520         if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
 521                 ASSERT(dp->i_afp->if_flags & XFS_IFINLINE);
 522                 error = xfs_attr_shortform_remove(&args);
 523                 if (error) {
 524                         goto out;
 525                 }
 526         } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
 527                 error = xfs_attr_leaf_removename(&args);
 528         } else {
 529                 error = xfs_attr_node_removename(&args);
 530         }
 531         if (error) {
 532                 goto out;
 533         }
 534
 535         /*
 536          * If this is a synchronous mount, make sure that the
 537          * transaction goes to disk before returning to the user.
 538          */
 539         if (mp->m_flags & XFS_MOUNT_WSYNC) {
 540                 xfs_trans_set_sync(args.trans);
 541         }
 542
 543         /*
 544          * Commit the last in the sequence of transactions.
 545          */
 546         xfs_trans_log_inode(args.trans, dp, XFS_ILOG_CORE);
 547         error = xfs_trans_commit(args.trans, XFS_TRANS_RELEASE_LOG_RES,
 548                                  NULL);
 549         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 550
 551         /*
 552          * Hit the inode change time.
 553          */
 554         if (!error && (flags & ATTR_KERNOTIME) == 0) {
 555                 xfs_ichgtime(dp, XFS_ICHGTIME_CHG);
 556         }
 557
 558         return(error);
 559
 560 out:
 561         if (args.trans)
 562                 xfs_trans_cancel(args.trans,
 563                         XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
 564         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 565         return(error);
 566 }
 567
 568 int
 569 xfs_attr_remove(bhv_desc_t *bdp, const char *name, int flags, struct cred *cred)
 570 {
 571         xfs_inode_t         *dp;
 572         int                 namelen;
 573
 574         namelen = strlen(name);
 575         if (namelen >= MAXNAMELEN)
 576                 return EFAULT;          /* match IRIX behaviour */
 577
 578         XFS_STATS_INC(xs_attr_remove);
 579
 580         dp = XFS_BHVTOI(bdp);
 581         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 582                 return (EIO);
 583
 584         xfs_ilock(dp, XFS_ILOCK_SHARED);
 585         if (XFS_IFORK_Q(dp) == 0 ||
 586                    (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 587                     dp->i_d.di_anextents == 0)) {
 588                 xfs_iunlock(dp, XFS_ILOCK_SHARED);
 589                 return(XFS_ERROR(ENOATTR));
 590         }
 591         xfs_iunlock(dp, XFS_ILOCK_SHARED);
 592
 593         return xfs_attr_remove_int(dp, name, namelen, flags);
 594 }
 595
 596 /*
 597  * Generate a list of extended attribute names and optionally
 598  * also value lengths.  Positive return value follows the XFS
 599  * convention of being an error, zero or negative return code
 600  * is the length of the buffer returned (negated), indicating
 601  * success.
 602  */
 603 int
 604 xfs_attr_list(bhv_desc_t *bdp, char *buffer, int bufsize, int flags,
 605                       attrlist_cursor_kern_t *cursor, struct cred *cred)
 606 {
 607         xfs_attr_list_context_t context;
 608         xfs_inode_t *dp;
 609         int error;
 610
 611         XFS_STATS_INC(xs_attr_list);
 612
 613         /*
 614          * Validate the cursor.
 615          */
 616         if (cursor->pad1 || cursor->pad2)
 617                 return(XFS_ERROR(EINVAL));
 618         if ((cursor->initted == 0) &&
 619             (cursor->hashval || cursor->blkno || cursor->offset))
 620                 return(XFS_ERROR(EINVAL));
 621
 622         /*
 623          * Check for a properly aligned buffer.
 624          */
 625         if (((long)buffer) & (sizeof(int)-1))
 626                 return(XFS_ERROR(EFAULT));
 627         if (flags & ATTR_KERNOVAL)
 628                 bufsize = 0;
 629
 630         /*
 631          * Initialize the output buffer.
 632          */
 633         context.dp = dp = XFS_BHVTOI(bdp);
 634         context.cursor = cursor;
 635         context.count = 0;
 636         context.dupcnt = 0;
 637         context.resynch = 1;
 638         context.flags = flags;
 639         if (!(flags & ATTR_KERNAMELS)) {
 640                 context.bufsize = (bufsize & ~(sizeof(int)-1));  /* align */
 641                 context.firstu = context.bufsize;
 642                 context.alist = (attrlist_t *)buffer;
 643                 context.alist->al_count = 0;
 644                 context.alist->al_more = 0;
 645                 context.alist->al_offset[0] = context.bufsize;
 646         }
 647         else {
 648                 context.bufsize = bufsize;
 649                 context.firstu = context.bufsize;
 650                 context.alist = (attrlist_t *)buffer;
 651         }
 652
 653         if (XFS_FORCED_SHUTDOWN(dp->i_mount))
 654                 return (EIO);
 655
 656         xfs_ilock(dp, XFS_ILOCK_SHARED);
 657         /*
 658          * Decide on what work routines to call based on the inode size.
 659          */
 660         xfs_attr_trace_l_c("syscall start", &context);
 661         if (XFS_IFORK_Q(dp) == 0 ||
 662             (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 663              dp->i_d.di_anextents == 0)) {
 664                 error = 0;
 665         } else if (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) {
 666                 error = xfs_attr_shortform_list(&context);
 667         } else if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
 668                 error = xfs_attr_leaf_list(&context);
 669         } else {
 670                 error = xfs_attr_node_list(&context);
 671         }
 672         xfs_iunlock(dp, XFS_ILOCK_SHARED);
 673         xfs_attr_trace_l_c("syscall end", &context);
 674
 675         if (!(context.flags & (ATTR_KERNOVAL|ATTR_KERNAMELS))) {
 676                 ASSERT(error >= 0);
 677         }
 678         else {  /* must return negated buffer size or the error */
 679                 if (context.count < 0)
 680                         error = XFS_ERROR(ERANGE);
 681                 else
 682                         error = -context.count;
 683         }
 684
 685         return(error);
 686 }
 687
 688 int                                                             /* error */
 689 xfs_attr_inactive(xfs_inode_t *dp)
 690 {
 691         xfs_trans_t *trans;
 692         xfs_mount_t *mp;
 693         int error;
 694
 695         mp = dp->i_mount;
 696         ASSERT(! XFS_NOT_DQATTACHED(mp, dp));
 697
 698         xfs_ilock(dp, XFS_ILOCK_SHARED);
 699         if ((XFS_IFORK_Q(dp) == 0) ||
 700             (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
 701             (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 702              dp->i_d.di_anextents == 0)) {
 703                 xfs_iunlock(dp, XFS_ILOCK_SHARED);
 704                 return(0);
 705         }
 706         xfs_iunlock(dp, XFS_ILOCK_SHARED);
 707
 708         /*
 709          * Start our first transaction of the day.
 710          *
 711          * All future transactions during this code must be "chained" off
 712          * this one via the trans_dup() call.  All transactions will contain
 713          * the inode, and the inode will always be marked with trans_ihold().
 714          * Since the inode will be locked in all transactions, we must log
 715          * the inode in every transaction to let it float upward through
 716          * the log.
 717          */
 718         trans = xfs_trans_alloc(mp, XFS_TRANS_ATTRINVAL);
 719         if ((error = xfs_trans_reserve(trans, 0, XFS_ATTRINVAL_LOG_RES(mp), 0,
 720                                       XFS_TRANS_PERM_LOG_RES,
 721                                       XFS_ATTRINVAL_LOG_COUNT))) {
 722                 xfs_trans_cancel(trans, 0);
 723                 return(error);
 724         }
 725         xfs_ilock(dp, XFS_ILOCK_EXCL);
 726
 727         /*
 728          * No need to make quota reservations here. We expect to release some
 729          * blocks, not allocate, in the common case.
 730          */
 731         xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
 732         xfs_trans_ihold(trans, dp);
 733
 734         /*
 735          * Decide on what work routines to call based on the inode size.
 736          */
 737         if ((XFS_IFORK_Q(dp) == 0) ||
 738             (dp->i_d.di_aformat == XFS_DINODE_FMT_LOCAL) ||
 739             (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS &&
 740              dp->i_d.di_anextents == 0)) {
 741                 error = 0;
 742                 goto out;
 743         }
 744         error = xfs_attr_root_inactive(&trans, dp);
 745         if (error)
 746                 goto out;
 747         /*
 748          * signal synchronous inactive transactions unless this
 749          * is a synchronous mount filesystem in which case we
 750          * know that we're here because we've been called out of
 751          * xfs_inactive which means that the last reference is gone
 752          * and the unlink transaction has already hit the disk so
 753          * async inactive transactions are safe.
 754          */
 755         if ((error = xfs_itruncate_finish(&trans, dp, 0LL, XFS_ATTR_FORK,
 756                                 (!(mp->m_flags & XFS_MOUNT_WSYNC)
 757                                  ? 1 : 0))))
 758                 goto out;
 759
 760         /*
 761          * Commit the last in the sequence of transactions.
 762          */
 763         xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
 764         error = xfs_trans_commit(trans, XFS_TRANS_RELEASE_LOG_RES,
 765                                  NULL);
 766         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 767
 768         return(error);
 769
 770 out:
 771         xfs_trans_cancel(trans, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
 772         xfs_iunlock(dp, XFS_ILOCK_EXCL);
 773         return(error);
 774 }
 775
 776
 777
 778 /*========================================================================
 779  * External routines when attribute list is inside the inode
 780  *========================================================================*/
 781
 782 /*
 783  * Add a name to the shortform attribute list structure
 784  * This is the external routine.
 785  */
 786 STATIC int
 787 xfs_attr_shortform_addname(xfs_da_args_t *args)
 788 {
 789         int newsize, forkoff, retval;
 790
 791         retval = xfs_attr_shortform_lookup(args);
 792         if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
 793                 return(retval);
 794         } else if (retval == EEXIST) {
 795                 if (args->flags & ATTR_CREATE)
 796                         return(retval);
 797                 retval = xfs_attr_shortform_remove(args);
 798                 ASSERT(retval == 0);
 799         }
 800
 801         if (args->namelen >= XFS_ATTR_SF_ENTSIZE_MAX ||
 802             args->valuelen >= XFS_ATTR_SF_ENTSIZE_MAX)
 803                 return(XFS_ERROR(ENOSPC));
 804
 805         newsize = XFS_ATTR_SF_TOTSIZE(args->dp);
 806         newsize += XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
 807
 808         forkoff = xfs_attr_shortform_bytesfit(args->dp, newsize);
 809         if (!forkoff)
 810                 return(XFS_ERROR(ENOSPC));
 811
 812         xfs_attr_shortform_add(args, forkoff);
 813         return(0);
 814 }
 815
 816
 817 /*========================================================================
 818  * External routines when attribute list is one block
 819  *========================================================================*/
 820
 821 /*
 822  * Add a name to the leaf attribute list structure
 823  *
 824  * This leaf block cannot have a "remote" value, we only call this routine
 825  * if bmap_one_block() says there is only one block (ie: no remote blks).
 826  */
 827 int
 828 xfs_attr_leaf_addname(xfs_da_args_t *args)
 829 {
 830         xfs_inode_t *dp;
 831         xfs_dabuf_t *bp;
 832         int retval, error, committed, forkoff;
 833
 834         /*
 835          * Read the (only) block in the attribute list in.
 836          */
 837         dp = args->dp;
 838         args->blkno = 0;
 839         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
 840                                              XFS_ATTR_FORK);
 841         if (error)
 842                 return(error);
 843         ASSERT(bp != NULL);
 844
 845         /*
 846          * Look up the given attribute in the leaf block.  Figure out if
 847          * the given flags produce an error or call for an atomic rename.
 848          */
 849         retval = xfs_attr_leaf_lookup_int(bp, args);
 850         if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
 851                 xfs_da_brelse(args->trans, bp);
 852                 return(retval);
 853         } else if (retval == EEXIST) {
 854                 if (args->flags & ATTR_CREATE) {        /* pure create op */
 855                         xfs_da_brelse(args->trans, bp);
 856                         return(retval);
 857                 }
 858                 args->rename = 1;                       /* an atomic rename */
 859                 args->blkno2 = args->blkno;             /* set 2nd entry info*/
 860                 args->index2 = args->index;
 861                 args->rmtblkno2 = args->rmtblkno;
 862                 args->rmtblkcnt2 = args->rmtblkcnt;
 863         }
 864
 865         /*
 866          * Add the attribute to the leaf block, transitioning to a Btree
 867          * if required.
 868          */
 869         retval = xfs_attr_leaf_add(bp, args);
 870         xfs_da_buf_done(bp);
 871         if (retval == ENOSPC) {
 872                 /*
 873                  * Promote the attribute list to the Btree format, then
 874                  * Commit that transaction so that the node_addname() call
 875                  * can manage its own transactions.
 876                  */
 877                 XFS_BMAP_INIT(args->flist, args->firstblock);
 878                 error = xfs_attr_leaf_to_node(args);
 879                 if (!error) {
 880                         error = xfs_bmap_finish(&args->trans, args->flist,
 881                                                 *args->firstblock, &committed);
 882                 }
 883                 if (error) {
 884                         ASSERT(committed);
 885                         args->trans = NULL;
 886                         xfs_bmap_cancel(args->flist);
 887                         return(error);
 888                 }
 889
 890                 /*
 891                  * bmap_finish() may have committed the last trans and started
 892                  * a new one.  We need the inode to be in all transactions.
 893                  */
 894                 if (committed) {
 895                         xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
 896                         xfs_trans_ihold(args->trans, dp);
 897                 }
 898
 899                 /*
 900                  * Commit the current trans (including the inode) and start
 901                  * a new one.
 902                  */
 903                 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
 904                         return (error);
 905
 906                 /*
 907                  * Fob the whole rest of the problem off on the Btree code.
 908                  */
 909                 error = xfs_attr_node_addname(args);
 910                 return(error);
 911         }
 912
 913         /*
 914          * Commit the transaction that added the attr name so that
 915          * later routines can manage their own transactions.
 916          */
 917         if ((error = xfs_attr_rolltrans(&args->trans, dp)))
 918                 return (error);
 919
 920         /*
 921          * If there was an out-of-line value, allocate the blocks we
 922          * identified for its storage and copy the value.  This is done
 923          * after we create the attribute so that we don't overflow the
 924          * maximum size of a transaction and/or hit a deadlock.
 925          */
 926         if (args->rmtblkno > 0) {
 927                 error = xfs_attr_rmtval_set(args);
 928                 if (error)
 929                         return(error);
 930         }
 931
 932         /*
 933          * If this is an atomic rename operation, we must "flip" the
 934          * incomplete flags on the "new" and "old" attribute/value pairs
 935          * so that one disappears and one appears atomically.  Then we
 936          * must remove the "old" attribute/value pair.
 937          */
 938         if (args->rename) {
 939                 /*
 940                  * In a separate transaction, set the incomplete flag on the
 941                  * "old" attr and clear the incomplete flag on the "new" attr.
 942                  */
 943                 error = xfs_attr_leaf_flipflags(args);
 944                 if (error)
 945                         return(error);
 946
 947                 /*
 948                  * Dismantle the "old" attribute/value pair by removing
 949                  * a "remote" value (if it exists).
 950                  */
 951                 args->index = args->index2;
 952                 args->blkno = args->blkno2;
 953                 args->rmtblkno = args->rmtblkno2;
 954                 args->rmtblkcnt = args->rmtblkcnt2;
 955                 if (args->rmtblkno) {
 956                         error = xfs_attr_rmtval_remove(args);
 957                         if (error)
 958                                 return(error);
 959                 }
 960
 961                 /*
 962                  * Read in the block containing the "old" attr, then
 963                  * remove the "old" attr from that block (neat, huh!)
 964                  */
 965                 error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1,
 966                                                      &bp, XFS_ATTR_FORK);
 967                 if (error)
 968                         return(error);
 969                 ASSERT(bp != NULL);
 970                 (void)xfs_attr_leaf_remove(bp, args);
 971
 972                 /*
 973                  * If the result is small enough, shrink it all into the inode.
 974                  */
 975                 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
 976                         XFS_BMAP_INIT(args->flist, args->firstblock);
 977                         error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
 978                         /* bp is gone due to xfs_da_shrink_inode */
 979                         if (!error) {
 980                                 error = xfs_bmap_finish(&args->trans,
 981                                                         args->flist,
 982                                                         *args->firstblock,
 983                                                         &committed);
 984                         }
 985                         if (error) {
 986                                 ASSERT(committed);
 987                                 args->trans = NULL;
 988                                 xfs_bmap_cancel(args->flist);
 989                                 return(error);
 990                         }
 991
 992                         /*
 993                          * bmap_finish() may have committed the last trans
 994                          * and started a new one.  We need the inode to be
 995                          * in all transactions.
 996                          */
 997                         if (committed) {
 998                                 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
 999                                 xfs_trans_ihold(args->trans, dp);
1000                         }
1001                 } else
1002                         xfs_da_buf_done(bp);
1003
1004                 /*
1005                  * Commit the remove and start the next trans in series.
1006                  */
1007                 error = xfs_attr_rolltrans(&args->trans, dp);
1008
1009         } else if (args->rmtblkno > 0) {
1010                 /*
1011                  * Added a "remote" value, just clear the incomplete flag.
1012                  */
1013                 error = xfs_attr_leaf_clearflag(args);
1014         }
1015         return(error);
1016 }
1017
1018 /*
1019  * Remove a name from the leaf attribute list structure
1020  *
1021  * This leaf block cannot have a "remote" value, we only call this routine
1022  * if bmap_one_block() says there is only one block (ie: no remote blks).
1023  */
1024 STATIC int
1025 xfs_attr_leaf_removename(xfs_da_args_t *args)
1026 {
1027         xfs_inode_t *dp;
1028         xfs_dabuf_t *bp;
1029         int error, committed, forkoff;
1030
1031         /*
1032          * Remove the attribute.
1033          */
1034         dp = args->dp;
1035         args->blkno = 0;
1036         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1037                                              XFS_ATTR_FORK);
1038         if (error) {
1039                 return(error);
1040         }
1041
1042         ASSERT(bp != NULL);
1043         error = xfs_attr_leaf_lookup_int(bp, args);
1044         if (error == ENOATTR) {
1045                 xfs_da_brelse(args->trans, bp);
1046                 return(error);
1047         }
1048
1049         (void)xfs_attr_leaf_remove(bp, args);
1050
1051         /*
1052          * If the result is small enough, shrink it all into the inode.
1053          */
1054         if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1055                 XFS_BMAP_INIT(args->flist, args->firstblock);
1056                 error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1057                 /* bp is gone due to xfs_da_shrink_inode */
1058                 if (!error) {
1059                         error = xfs_bmap_finish(&args->trans, args->flist,
1060                                                 *args->firstblock, &committed);
1061                 }
1062                 if (error) {
1063                         ASSERT(committed);
1064                         args->trans = NULL;
1065                         xfs_bmap_cancel(args->flist);
1066                         return(error);
1067                 }
1068
1069                 /*
1070                  * bmap_finish() may have committed the last trans and started
1071                  * a new one.  We need the inode to be in all transactions.
1072                  */
1073                 if (committed) {
1074                         xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1075                         xfs_trans_ihold(args->trans, dp);
1076                 }
1077         } else
1078                 xfs_da_buf_done(bp);
1079         return(0);
1080 }
1081
1082 /*
1083  * Look up a name in a leaf attribute list structure.
1084  *
1085  * This leaf block cannot have a "remote" value, we only call this routine
1086  * if bmap_one_block() says there is only one block (ie: no remote blks).
1087  */
1088 STATIC int
1089 xfs_attr_leaf_get(xfs_da_args_t *args)
1090 {
1091         xfs_dabuf_t *bp;
1092         int error;
1093
1094         args->blkno = 0;
1095         error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
1096                                              XFS_ATTR_FORK);
1097         if (error)
1098                 return(error);
1099         ASSERT(bp != NULL);
1100
1101         error = xfs_attr_leaf_lookup_int(bp, args);
1102         if (error != EEXIST)  {
1103                 xfs_da_brelse(args->trans, bp);
1104                 return(error);
1105         }
1106         error = xfs_attr_leaf_getvalue(bp, args);
1107         xfs_da_brelse(args->trans, bp);
1108         if (!error && (args->rmtblkno > 0) && !(args->flags & ATTR_KERNOVAL)) {
1109                 error = xfs_attr_rmtval_get(args);
1110         }
1111         return(error);
1112 }
1113
1114 /*
1115  * Copy out attribute entries for attr_list(), for leaf attribute lists.
1116  */
1117 STATIC int
1118 xfs_attr_leaf_list(xfs_attr_list_context_t *context)
1119 {
1120         xfs_attr_leafblock_t *leaf;
1121         int error;
1122         xfs_dabuf_t *bp;
1123
1124         context->cursor->blkno = 0;
1125         error = xfs_da_read_buf(NULL, context->dp, 0, -1, &bp, XFS_ATTR_FORK);
1126         if (error)
1127                 return(error);
1128         ASSERT(bp != NULL);
1129         leaf = bp->data;
1130         if (unlikely(be16_to_cpu(leaf->hdr.info.magic) != XFS_ATTR_LEAF_MAGIC)) {
1131                 XFS_CORRUPTION_ERROR("xfs_attr_leaf_list", XFS_ERRLEVEL_LOW,
1132                                      context->dp->i_mount, leaf);
1133                 xfs_da_brelse(NULL, bp);
1134                 return(XFS_ERROR(EFSCORRUPTED));
1135         }
1136
1137         (void)xfs_attr_leaf_list_int(bp, context);
1138         xfs_da_brelse(NULL, bp);
1139         return(0);
1140 }
1141
1142
1143 /*========================================================================
1144  * External routines when attribute list size > XFS_LBSIZE(mp).
1145  *========================================================================*/
1146
1147 /*
1148  * Add a name to a Btree-format attribute list.
1149  *
1150  * This will involve walking down the Btree, and may involve splitting
1151  * leaf nodes and even splitting intermediate nodes up to and including
1152  * the root node (a special case of an intermediate node).
1153  *
1154  * "Remote" attribute values confuse the issue and atomic rename operations
1155  * add a whole extra layer of confusion on top of that.
1156  */
1157 STATIC int
1158 xfs_attr_node_addname(xfs_da_args_t *args)
1159 {
1160         xfs_da_state_t *state;
1161         xfs_da_state_blk_t *blk;
1162         xfs_inode_t *dp;
1163         xfs_mount_t *mp;
1164         int committed, retval, error;
1165
1166         /*
1167          * Fill in bucket of arguments/results/context to carry around.
1168          */
1169         dp = args->dp;
1170         mp = dp->i_mount;
1171 restart:
1172         state = xfs_da_state_alloc();
1173         state->args = args;
1174         state->mp = mp;
1175         state->blocksize = state->mp->m_sb.sb_blocksize;
1176         state->node_ents = state->mp->m_attr_node_ents;
1177
1178         /*
1179          * Search to see if name already exists, and get back a pointer
1180          * to where it should go.
1181          */
1182         error = xfs_da_node_lookup_int(state, &retval);
1183         if (error)
1184                 goto out;
1185         blk = &state->path.blk[ state->path.active-1 ];
1186         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1187         if ((args->flags & ATTR_REPLACE) && (retval == ENOATTR)) {
1188                 goto out;
1189         } else if (retval == EEXIST) {
1190                 if (args->flags & ATTR_CREATE)
1191                         goto out;
1192                 args->rename = 1;                       /* atomic rename op */
1193                 args->blkno2 = args->blkno;             /* set 2nd entry info*/
1194                 args->index2 = args->index;
1195                 args->rmtblkno2 = args->rmtblkno;
1196                 args->rmtblkcnt2 = args->rmtblkcnt;
1197                 args->rmtblkno = 0;
1198                 args->rmtblkcnt = 0;
1199         }
1200
1201         retval = xfs_attr_leaf_add(blk->bp, state->args);
1202         if (retval == ENOSPC) {
1203                 if (state->path.active == 1) {
1204                         /*
1205                          * Its really a single leaf node, but it had
1206                          * out-of-line values so it looked like it *might*
1207                          * have been a b-tree.
1208                          */
1209                         xfs_da_state_free(state);
1210                         XFS_BMAP_INIT(args->flist, args->firstblock);
1211                         error = xfs_attr_leaf_to_node(args);
1212                         if (!error) {
1213                                 error = xfs_bmap_finish(&args->trans,
1214                                                         args->flist,
1215                                                         *args->firstblock,
1216                                                         &committed);
1217                         }
1218                         if (error) {
1219                                 ASSERT(committed);
1220                                 args->trans = NULL;
1221                                 xfs_bmap_cancel(args->flist);
1222                                 goto out;
1223                         }
1224
1225                         /*
1226                          * bmap_finish() may have committed the last trans
1227                          * and started a new one.  We need the inode to be
1228                          * in all transactions.
1229                          */
1230                         if (committed) {
1231                                 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1232                                 xfs_trans_ihold(args->trans, dp);
1233                         }
1234
1235                         /*
1236                          * Commit the node conversion and start the next
1237                          * trans in the chain.
1238                          */
1239                         if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1240                                 goto out;
1241
1242                         goto restart;
1243                 }
1244
1245                 /*
1246                  * Split as many Btree elements as required.
1247                  * This code tracks the new and old attr's location
1248                  * in the index/blkno/rmtblkno/rmtblkcnt fields and
1249                  * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
1250                  */
1251                 XFS_BMAP_INIT(args->flist, args->firstblock);
1252                 error = xfs_da_split(state);
1253                 if (!error) {
1254                         error = xfs_bmap_finish(&args->trans, args->flist,
1255                                                 *args->firstblock, &committed);
1256                 }
1257                 if (error) {
1258                         ASSERT(committed);
1259                         args->trans = NULL;
1260                         xfs_bmap_cancel(args->flist);
1261                         goto out;
1262                 }
1263
1264                 /*
1265                  * bmap_finish() may have committed the last trans and started
1266                  * a new one.  We need the inode to be in all transactions.
1267                  */
1268                 if (committed) {
1269                         xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1270                         xfs_trans_ihold(args->trans, dp);
1271                 }
1272         } else {
1273                 /*
1274                  * Addition succeeded, update Btree hashvals.
1275                  */
1276                 xfs_da_fixhashpath(state, &state->path);
1277         }
1278
1279         /*
1280          * Kill the state structure, we're done with it and need to
1281          * allow the buffers to come back later.
1282          */
1283         xfs_da_state_free(state);
1284         state = NULL;
1285
1286         /*
1287          * Commit the leaf addition or btree split and start the next
1288          * trans in the chain.
1289          */
1290         if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1291                 goto out;
1292
1293         /*
1294          * If there was an out-of-line value, allocate the blocks we
1295          * identified for its storage and copy the value.  This is done
1296          * after we create the attribute so that we don't overflow the
1297          * maximum size of a transaction and/or hit a deadlock.
1298          */
1299         if (args->rmtblkno > 0) {
1300                 error = xfs_attr_rmtval_set(args);
1301                 if (error)
1302                         return(error);
1303         }
1304
1305         /*
1306          * If this is an atomic rename operation, we must "flip" the
1307          * incomplete flags on the "new" and "old" attribute/value pairs
1308          * so that one disappears and one appears atomically.  Then we
1309          * must remove the "old" attribute/value pair.
1310          */
1311         if (args->rename) {
1312                 /*
1313                  * In a separate transaction, set the incomplete flag on the
1314                  * "old" attr and clear the incomplete flag on the "new" attr.
1315                  */
1316                 error = xfs_attr_leaf_flipflags(args);
1317                 if (error)
1318                         goto out;
1319
1320                 /*
1321                  * Dismantle the "old" attribute/value pair by removing
1322                  * a "remote" value (if it exists).
1323                  */
1324                 args->index = args->index2;
1325                 args->blkno = args->blkno2;
1326                 args->rmtblkno = args->rmtblkno2;
1327                 args->rmtblkcnt = args->rmtblkcnt2;
1328                 if (args->rmtblkno) {
1329                         error = xfs_attr_rmtval_remove(args);
1330                         if (error)
1331                                 return(error);
1332                 }
1333
1334                 /*
1335                  * Re-find the "old" attribute entry after any split ops.
1336                  * The INCOMPLETE flag means that we will find the "old"
1337                  * attr, not the "new" one.
1338                  */
1339                 args->flags |= XFS_ATTR_INCOMPLETE;
1340                 state = xfs_da_state_alloc();
1341                 state->args = args;
1342                 state->mp = mp;
1343                 state->blocksize = state->mp->m_sb.sb_blocksize;
1344                 state->node_ents = state->mp->m_attr_node_ents;
1345                 state->inleaf = 0;
1346                 error = xfs_da_node_lookup_int(state, &retval);
1347                 if (error)
1348                         goto out;
1349
1350                 /*
1351                  * Remove the name and update the hashvals in the tree.
1352                  */
1353                 blk = &state->path.blk[ state->path.active-1 ];
1354                 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1355                 error = xfs_attr_leaf_remove(blk->bp, args);
1356                 xfs_da_fixhashpath(state, &state->path);
1357
1358                 /*
1359                  * Check to see if the tree needs to be collapsed.
1360                  */
1361                 if (retval && (state->path.active > 1)) {
1362                         XFS_BMAP_INIT(args->flist, args->firstblock);
1363                         error = xfs_da_join(state);
1364                         if (!error) {
1365                                 error = xfs_bmap_finish(&args->trans,
1366                                                         args->flist,
1367                                                         *args->firstblock,
1368                                                         &committed);
1369                         }
1370                         if (error) {
1371                                 ASSERT(committed);
1372                                 args->trans = NULL;
1373                                 xfs_bmap_cancel(args->flist);
1374                                 goto out;
1375                         }
1376
1377                         /*
1378                          * bmap_finish() may have committed the last trans
1379                          * and started a new one.  We need the inode to be
1380                          * in all transactions.
1381                          */
1382                         if (committed) {
1383                                 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1384                                 xfs_trans_ihold(args->trans, dp);
1385                         }
1386                 }
1387
1388                 /*
1389                  * Commit and start the next trans in the chain.
1390                  */
1391                 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1392                         goto out;
1393
1394         } else if (args->rmtblkno > 0) {
1395                 /*
1396                  * Added a "remote" value, just clear the incomplete flag.
1397                  */
1398                 error = xfs_attr_leaf_clearflag(args);
1399                 if (error)
1400                         goto out;
1401         }
1402         retval = error = 0;
1403
1404 out:
1405         if (state)
1406                 xfs_da_state_free(state);
1407         if (error)
1408                 return(error);
1409         return(retval);
1410 }
1411
1412 /*
1413  * Remove a name from a B-tree attribute list.
1414  *
1415  * This will involve walking down the Btree, and may involve joining
1416  * leaf nodes and even joining intermediate nodes up to and including
1417  * the root node (a special case of an intermediate node).
1418  */
1419 STATIC int
1420 xfs_attr_node_removename(xfs_da_args_t *args)
1421 {
1422         xfs_da_state_t *state;
1423         xfs_da_state_blk_t *blk;
1424         xfs_inode_t *dp;
1425         xfs_dabuf_t *bp;
1426         int retval, error, committed, forkoff;
1427
1428         /*
1429          * Tie a string around our finger to remind us where we are.
1430          */
1431         dp = args->dp;
1432         state = xfs_da_state_alloc();
1433         state->args = args;
1434         state->mp = dp->i_mount;
1435         state->blocksize = state->mp->m_sb.sb_blocksize;
1436         state->node_ents = state->mp->m_attr_node_ents;
1437
1438         /*
1439          * Search to see if name exists, and get back a pointer to it.
1440          */
1441         error = xfs_da_node_lookup_int(state, &retval);
1442         if (error || (retval != EEXIST)) {
1443                 if (error == 0)
1444                         error = retval;
1445                 goto out;
1446         }
1447
1448         /*
1449          * If there is an out-of-line value, de-allocate the blocks.
1450          * This is done before we remove the attribute so that we don't
1451          * overflow the maximum size of a transaction and/or hit a deadlock.
1452          */
1453         blk = &state->path.blk[ state->path.active-1 ];
1454         ASSERT(blk->bp != NULL);
1455         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1456         if (args->rmtblkno > 0) {
1457                 /*
1458                  * Fill in disk block numbers in the state structure
1459                  * so that we can get the buffers back after we commit
1460                  * several transactions in the following calls.
1461                  */
1462                 error = xfs_attr_fillstate(state);
1463                 if (error)
1464                         goto out;
1465
1466                 /*
1467                  * Mark the attribute as INCOMPLETE, then bunmapi() the
1468                  * remote value.
1469                  */
1470                 error = xfs_attr_leaf_setflag(args);
1471                 if (error)
1472                         goto out;
1473                 error = xfs_attr_rmtval_remove(args);
1474                 if (error)
1475                         goto out;
1476
1477                 /*
1478                  * Refill the state structure with buffers, the prior calls
1479                  * released our buffers.
1480                  */
1481                 error = xfs_attr_refillstate(state);
1482                 if (error)
1483                         goto out;
1484         }
1485
1486         /*
1487          * Remove the name and update the hashvals in the tree.
1488          */
1489         blk = &state->path.blk[ state->path.active-1 ];
1490         ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1491         retval = xfs_attr_leaf_remove(blk->bp, args);
1492         xfs_da_fixhashpath(state, &state->path);
1493
1494         /*
1495          * Check to see if the tree needs to be collapsed.
1496          */
1497         if (retval && (state->path.active > 1)) {
1498                 XFS_BMAP_INIT(args->flist, args->firstblock);
1499                 error = xfs_da_join(state);
1500                 if (!error) {
1501                         error = xfs_bmap_finish(&args->trans, args->flist,
1502                                                 *args->firstblock, &committed);
1503                 }
1504                 if (error) {
1505                         ASSERT(committed);
1506                         args->trans = NULL;
1507                         xfs_bmap_cancel(args->flist);
1508                         goto out;
1509                 }
1510
1511                 /*
1512                  * bmap_finish() may have committed the last trans and started
1513                  * a new one.  We need the inode to be in all transactions.
1514                  */
1515                 if (committed) {
1516                         xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1517                         xfs_trans_ihold(args->trans, dp);
1518                 }
1519
1520                 /*
1521                  * Commit the Btree join operation and start a new trans.
1522                  */
1523                 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
1524                         goto out;
1525         }
1526
1527         /*
1528          * If the result is small enough, push it all into the inode.
1529          */
1530         if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
1531                 /*
1532                  * Have to get rid of the copy of this dabuf in the state.
1533                  */
1534                 ASSERT(state->path.active == 1);
1535                 ASSERT(state->path.blk[0].bp);
1536                 xfs_da_buf_done(state->path.blk[0].bp);
1537                 state->path.blk[0].bp = NULL;
1538
1539                 error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
1540                                                      XFS_ATTR_FORK);
1541                 if (error)
1542                         goto out;
1543                 ASSERT(be16_to_cpu(((xfs_attr_leafblock_t *)
1544                                       bp->data)->hdr.info.magic)
1545                                                        == XFS_ATTR_LEAF_MAGIC);
1546
1547                 if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
1548                         XFS_BMAP_INIT(args->flist, args->firstblock);
1549                         error = xfs_attr_leaf_to_shortform(bp, args, forkoff);
1550                         /* bp is gone due to xfs_da_shrink_inode */
1551                         if (!error) {
1552                                 error = xfs_bmap_finish(&args->trans,
1553                                                         args->flist,
1554                                                         *args->firstblock,
1555                                                         &committed);
1556                         }
1557                         if (error) {
1558                                 ASSERT(committed);
1559                                 args->trans = NULL;
1560                                 xfs_bmap_cancel(args->flist);
1561                                 goto out;
1562                         }
1563
1564                         /*
1565                          * bmap_finish() may have committed the last trans
1566                          * and started a new one.  We need the inode to be
1567                          * in all transactions.
1568                          */
1569                         if (committed) {
1570                                 xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
1571                                 xfs_trans_ihold(args->trans, dp);
1572                         }
1573                 } else
1574                         xfs_da_brelse(args->trans, bp);
1575         }
1576         error = 0;
1577
1578 out:
1579         xfs_da_state_free(state);
1580         return(error);
1581 }
1582
1583 /*
1584  * Fill in the disk block numbers in the state structure for the buffers
1585  * that are attached to the state structure.
1586  * This is done so that we can quickly reattach ourselves to those buffers
1587  * after some set of transaction commit's has released these buffers.
1588  */
1589 STATIC int
1590 xfs_attr_fillstate(xfs_da_state_t *state)
1591 {
1592         xfs_da_state_path_t *path;
1593         xfs_da_state_blk_t *blk;
1594         int level;
1595
1596         /*
1597          * Roll down the "path" in the state structure, storing the on-disk
1598          * block number for those buffers in the "path".
1599          */
1600         path = &state->path;
1601         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1602         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1603                 if (blk->bp) {
1604                         blk->disk_blkno = xfs_da_blkno(blk->bp);
1605                         xfs_da_buf_done(blk->bp);
1606                         blk->bp = NULL;
1607                 } else {
1608                         blk->disk_blkno = 0;
1609                 }
1610         }
1611
1612         /*
1613          * Roll down the "altpath" in the state structure, storing the on-disk
1614          * block number for those buffers in the "altpath".
1615          */
1616         path = &state->altpath;
1617         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1618         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1619                 if (blk->bp) {
1620                         blk->disk_blkno = xfs_da_blkno(blk->bp);
1621                         xfs_da_buf_done(blk->bp);
1622                         blk->bp = NULL;
1623                 } else {
1624                         blk->disk_blkno = 0;
1625                 }
1626         }
1627
1628         return(0);
1629 }
1630
1631 /*
1632  * Reattach the buffers to the state structure based on the disk block
1633  * numbers stored in the state structure.
1634  * This is done after some set of transaction commit's has released those
1635  * buffers from our grip.
1636  */
1637 STATIC int
1638 xfs_attr_refillstate(xfs_da_state_t *state)
1639 {
1640         xfs_da_state_path_t *path;
1641         xfs_da_state_blk_t *blk;
1642         int level, error;
1643
1644         /*
1645          * Roll down the "path" in the state structure, storing the on-disk
1646          * block number for those buffers in the "path".
1647          */
1648         path = &state->path;
1649         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1650         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1651                 if (blk->disk_blkno) {
1652                         error = xfs_da_read_buf(state->args->trans,
1653                                                 state->args->dp,
1654                                                 blk->blkno, blk->disk_blkno,
1655                                                 &blk->bp, XFS_ATTR_FORK);
1656                         if (error)
1657                                 return(error);
1658                 } else {
1659                         blk->bp = NULL;
1660                 }
1661         }
1662
1663         /*
1664          * Roll down the "altpath" in the state structure, storing the on-disk
1665          * block number for those buffers in the "altpath".
1666          */
1667         path = &state->altpath;
1668         ASSERT((path->active >= 0) && (path->active < XFS_DA_NODE_MAXDEPTH));
1669         for (blk = path->blk, level = 0; level < path->active; blk++, level++) {
1670                 if (blk->disk_blkno) {
1671                         error = xfs_da_read_buf(state->args->trans,
1672                                                 state->args->dp,
1673                                                 blk->blkno, blk->disk_blkno,
1674                                                 &blk->bp, XFS_ATTR_FORK);
1675                         if (error)
1676                                 return(error);
1677                 } else {
1678                         blk->bp = NULL;
1679                 }
1680         }
1681
1682         return(0);
1683 }
1684
1685 /*
1686  * Look up a filename in a node attribute list.
1687  *
1688  * This routine gets called for any attribute fork that has more than one
1689  * block, ie: both true Btree attr lists and for single-leaf-blocks with
1690  * "remote" values taking up more blocks.
1691  */
1692 STATIC int
1693 xfs_attr_node_get(xfs_da_args_t *args)
1694 {
1695         xfs_da_state_t *state;
1696         xfs_da_state_blk_t *blk;
1697         int error, retval;
1698         int i;
1699
1700         state = xfs_da_state_alloc();
1701         state->args = args;
1702         state->mp = args->dp->i_mount;
1703         state->blocksize = state->mp->m_sb.sb_blocksize;
1704         state->node_ents = state->mp->m_attr_node_ents;
1705
1706         /*
1707          * Search to see if name exists, and get back a pointer to it.
1708          */
1709         error = xfs_da_node_lookup_int(state, &retval);
1710         if (error) {
1711                 retval = error;
1712         } else if (retval == EEXIST) {
1713                 blk = &state->path.blk[ state->path.active-1 ];
1714                 ASSERT(blk->bp != NULL);
1715                 ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
1716
1717                 /*
1718                  * Get the value, local or "remote"
1719                  */
1720                 retval = xfs_attr_leaf_getvalue(blk->bp, args);
1721                 if (!retval && (args->rmtblkno > 0)
1722                     && !(args->flags & ATTR_KERNOVAL)) {
1723                         retval = xfs_attr_rmtval_get(args);
1724                 }
1725         }
1726
1727         /*
1728          * If not in a transaction, we have to release all the buffers.
1729          */
1730         for (i = 0; i < state->path.active; i++) {
1731                 xfs_da_brelse(args->trans, state->path.blk[i].bp);
1732                 state->path.blk[i].bp = NULL;
1733         }
1734
1735         xfs_da_state_free(state);
1736         return(retval);
1737 }
1738
1739 STATIC int                                                      /* error */
1740 xfs_attr_node_list(xfs_attr_list_context_t *context)
1741 {
1742         attrlist_cursor_kern_t *cursor;
1743         xfs_attr_leafblock_t *leaf;
1744         xfs_da_intnode_t *node;
1745         xfs_da_node_entry_t *btree;
1746         int error, i;
1747         xfs_dabuf_t *bp;
1748
1749         cursor = context->cursor;
1750         cursor->initted = 1;
1751
1752         /*
1753          * Do all sorts of validation on the passed-in cursor structure.
1754          * If anything is amiss, ignore the cursor and look up the hashval
1755          * starting from the btree root.
1756          */
1757         bp = NULL;
1758         if (cursor->blkno > 0) {
1759                 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1760                                               &bp, XFS_ATTR_FORK);
1761                 if ((error != 0) && (error != EFSCORRUPTED))
1762                         return(error);
1763                 if (bp) {
1764                         node = bp->data;
1765                         switch (be16_to_cpu(node->hdr.info.magic)) {
1766                         case XFS_DA_NODE_MAGIC:
1767                                 xfs_attr_trace_l_cn("wrong blk", context, node);
1768                                 xfs_da_brelse(NULL, bp);
1769                                 bp = NULL;
1770                                 break;
1771                         case XFS_ATTR_LEAF_MAGIC:
1772                                 leaf = bp->data;
1773                                 if (cursor->hashval > be32_to_cpu(leaf->entries[
1774                                     be16_to_cpu(leaf->hdr.count)-1].hashval)) {
1775                                         xfs_attr_trace_l_cl("wrong blk",
1776                                                            context, leaf);
1777                                         xfs_da_brelse(NULL, bp);
1778                                         bp = NULL;
1779                                 } else if (cursor->hashval <=
1780                                              be32_to_cpu(leaf->entries[0].hashval)) {
1781                                         xfs_attr_trace_l_cl("maybe wrong blk",
1782                                                            context, leaf);
1783                                         xfs_da_brelse(NULL, bp);
1784                                         bp = NULL;
1785                                 }
1786                                 break;
1787                         default:
1788                                 xfs_attr_trace_l_c("wrong blk - ??", context);
1789                                 xfs_da_brelse(NULL, bp);
1790                                 bp = NULL;
1791                         }
1792                 }
1793         }
1794
1795         /*
1796          * We did not find what we expected given the cursor's contents,
1797          * so we start from the top and work down based on the hash value.
1798          * Note that start of node block is same as start of leaf block.
1799          */
1800         if (bp == NULL) {
1801                 cursor->blkno = 0;
1802                 for (;;) {
1803                         error = xfs_da_read_buf(NULL, context->dp,
1804                                                       cursor->blkno, -1, &bp,
1805                                                       XFS_ATTR_FORK);
1806                         if (error)
1807                                 return(error);
1808                         if (unlikely(bp == NULL)) {
1809                                 XFS_ERROR_REPORT("xfs_attr_node_list(2)",
1810                                                  XFS_ERRLEVEL_LOW,
1811                                                  context->dp->i_mount);
1812                                 return(XFS_ERROR(EFSCORRUPTED));
1813                         }
1814                         node = bp->data;
1815                         if (be16_to_cpu(node->hdr.info.magic)
1816                                                         == XFS_ATTR_LEAF_MAGIC)
1817                                 break;
1818                         if (unlikely(be16_to_cpu(node->hdr.info.magic)
1819                                                         != XFS_DA_NODE_MAGIC)) {
1820                                 XFS_CORRUPTION_ERROR("xfs_attr_node_list(3)",
1821                                                      XFS_ERRLEVEL_LOW,
1822                                                      context->dp->i_mount,
1823                                                      node);
1824                                 xfs_da_brelse(NULL, bp);
1825                                 return(XFS_ERROR(EFSCORRUPTED));
1826                         }
1827                         btree = node->btree;
1828                         for (i = 0; i < be16_to_cpu(node->hdr.count);
1829                                                                 btree++, i++) {
1830                                 if (cursor->hashval
1831                                                 <= be32_to_cpu(btree->hashval)) {
1832                                         cursor->blkno = be32_to_cpu(btree->before);
1833                                         xfs_attr_trace_l_cb("descending",
1834                                                             context, btree);
1835                                         break;
1836                                 }
1837                         }
1838                         if (i == be16_to_cpu(node->hdr.count)) {
1839                                 xfs_da_brelse(NULL, bp);
1840                                 return(0);
1841                         }
1842                         xfs_da_brelse(NULL, bp);
1843                 }
1844         }
1845         ASSERT(bp != NULL);
1846
1847         /*
1848          * Roll upward through the blocks, processing each leaf block in
1849          * order.  As long as there is space in the result buffer, keep
1850          * adding the information.
1851          */
1852         for (;;) {
1853                 leaf = bp->data;
1854                 if (unlikely(be16_to_cpu(leaf->hdr.info.magic)
1855                                                 != XFS_ATTR_LEAF_MAGIC)) {
1856                         XFS_CORRUPTION_ERROR("xfs_attr_node_list(4)",
1857                                              XFS_ERRLEVEL_LOW,
1858                                              context->dp->i_mount, leaf);
1859                         xfs_da_brelse(NULL, bp);
1860                         return(XFS_ERROR(EFSCORRUPTED));
1861                 }
1862                 error = xfs_attr_leaf_list_int(bp, context);
1863                 if (error || !leaf->hdr.info.forw)
1864                         break;  /* not really an error, buffer full or EOF */
1865                 cursor->blkno = be32_to_cpu(leaf->hdr.info.forw);
1866                 xfs_da_brelse(NULL, bp);
1867                 error = xfs_da_read_buf(NULL, context->dp, cursor->blkno, -1,
1868                                               &bp, XFS_ATTR_FORK);
1869                 if (error)
1870                         return(error);
1871                 if (unlikely((bp == NULL))) {
1872                         XFS_ERROR_REPORT("xfs_attr_node_list(5)",
1873                                          XFS_ERRLEVEL_LOW,
1874                                          context->dp->i_mount);
1875                         return(XFS_ERROR(EFSCORRUPTED));
1876                 }
1877         }
1878         xfs_da_brelse(NULL, bp);
1879         return(0);
1880 }
1881
1882
1883 /*========================================================================
1884  * External routines for manipulating out-of-line attribute values.
1885  *========================================================================*/
1886
1887 /*
1888  * Read the value associated with an attribute from the out-of-line buffer
1889  * that we stored it in.
1890  */
1891 STATIC int
1892 xfs_attr_rmtval_get(xfs_da_args_t *args)
1893 {
1894         xfs_bmbt_irec_t map[ATTR_RMTVALUE_MAPSIZE];
1895         xfs_mount_t *mp;
1896         xfs_daddr_t dblkno;
1897         xfs_caddr_t dst;
1898         xfs_buf_t *bp;
1899         int nmap, error, tmp, valuelen, blkcnt, i;
1900         xfs_dablk_t lblkno;
1901
1902         ASSERT(!(args->flags & ATTR_KERNOVAL));
1903
1904         mp = args->dp->i_mount;
1905         dst = args->value;
1906         valuelen = args->valuelen;
1907         lblkno = args->rmtblkno;
1908         while (valuelen > 0) {
1909                 nmap = ATTR_RMTVALUE_MAPSIZE;
1910                 error = xfs_bmapi(args->trans, args->dp, (xfs_fileoff_t)lblkno,
1911                                   args->rmtblkcnt,
1912                                   XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
1913                                   NULL, 0, map, &nmap, NULL);
1914                 if (error)
1915                         return(error);
1916                 ASSERT(nmap >= 1);
1917
1918                 for (i = 0; (i < nmap) && (valuelen > 0); i++) {
1919                         ASSERT((map[i].br_startblock != DELAYSTARTBLOCK) &&
1920                                (map[i].br_startblock != HOLESTARTBLOCK));
1921                         dblkno = XFS_FSB_TO_DADDR(mp, map[i].br_startblock);
1922                         blkcnt = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
1923                         error = xfs_read_buf(mp, mp->m_ddev_targp, dblkno,
1924                                              blkcnt, XFS_BUF_LOCK, &bp);
1925                         if (error)
1926                                 return(error);
1927
1928                         tmp = (valuelen < XFS_BUF_SIZE(bp))
1929                                 ? valuelen : XFS_BUF_SIZE(bp);
1930                         xfs_biomove(bp, 0, tmp, dst, XFS_B_READ);
1931                         xfs_buf_relse(bp);
1932                         dst += tmp;
1933                         valuelen -= tmp;
1934
1935                         lblkno += map[i].br_blockcount;
1936                 }
1937         }
1938         ASSERT(valuelen == 0);
1939         return(0);
1940 }
1941
1942 /*
1943  * Write the value associated with an attribute into the out-of-line buffer
1944  * that we have defined for it.
1945  */
1946 STATIC int
1947 xfs_attr_rmtval_set(xfs_da_args_t *args)
1948 {
1949         xfs_mount_t *mp;
1950         xfs_fileoff_t lfileoff;
1951         xfs_inode_t *dp;
1952         xfs_bmbt_irec_t map;
1953         xfs_daddr_t dblkno;
1954         xfs_caddr_t src;
1955         xfs_buf_t *bp;
1956         xfs_dablk_t lblkno;
1957         int blkcnt, valuelen, nmap, error, tmp, committed;
1958
1959         dp = args->dp;
1960         mp = dp->i_mount;
1961         src = args->value;
1962
1963         /*
1964          * Find a "hole" in the attribute address space large enough for
1965          * us to drop the new attribute's value into.
1966          */
1967         blkcnt = XFS_B_TO_FSB(mp, args->valuelen);
1968         lfileoff = 0;
1969         error = xfs_bmap_first_unused(args->trans, args->dp, blkcnt, &lfileoff,
1970                                                    XFS_ATTR_FORK);
1971         if (error) {
1972                 return(error);
1973         }
1974         args->rmtblkno = lblkno = (xfs_dablk_t)lfileoff;
1975         args->rmtblkcnt = blkcnt;
1976
1977         /*
1978          * Roll through the "value", allocating blocks on disk as required.
1979          */
1980         while (blkcnt > 0) {
1981                 /*
1982                  * Allocate a single extent, up to the size of the value.
1983                  */
1984                 XFS_BMAP_INIT(args->flist, args->firstblock);
1985                 nmap = 1;
1986                 error = xfs_bmapi(args->trans, dp, (xfs_fileoff_t)lblkno,
1987                                   blkcnt,
1988                                   XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA |
1989                                                         XFS_BMAPI_WRITE,
1990                                   args->firstblock, args->total, &map, &nmap,
1991                                   args->flist);
1992                 if (!error) {
1993                         error = xfs_bmap_finish(&args->trans, args->flist,
1994                                                 *args->firstblock, &committed);
1995                 }
1996                 if (error) {
1997                         ASSERT(committed);
1998                         args->trans = NULL;
1999                         xfs_bmap_cancel(args->flist);
2000                         return(error);
2001                 }
2002
2003                 /*
2004                  * bmap_finish() may have committed the last trans and started
2005                  * a new one.  We need the inode to be in all transactions.
2006                  */
2007                 if (committed) {
2008                         xfs_trans_ijoin(args->trans, dp, XFS_ILOCK_EXCL);
2009                         xfs_trans_ihold(args->trans, dp);
2010                 }
2011
2012                 ASSERT(nmap == 1);
2013                 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2014                        (map.br_startblock != HOLESTARTBLOCK));
2015                 lblkno += map.br_blockcount;
2016                 blkcnt -= map.br_blockcount;
2017
2018                 /*
2019                  * Start the next trans in the chain.
2020                  */
2021                 if ((error = xfs_attr_rolltrans(&args->trans, dp)))
2022                         return (error);
2023         }
2024
2025         /*
2026          * Roll through the "value", copying the attribute value to the
2027          * already-allocated blocks.  Blocks are written synchronously
2028          * so that we can know they are all on disk before we turn off
2029          * the INCOMPLETE flag.
2030          */
2031         lblkno = args->rmtblkno;
2032         valuelen = args->valuelen;
2033         while (valuelen > 0) {
2034                 /*
2035                  * Try to remember where we decided to put the value.
2036                  */
2037                 XFS_BMAP_INIT(args->flist, args->firstblock);
2038                 nmap = 1;
2039                 error = xfs_bmapi(NULL, dp, (xfs_fileoff_t)lblkno,
2040                                   args->rmtblkcnt,
2041                                   XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2042                                   args->firstblock, 0, &map, &nmap, NULL);
2043                 if (error) {
2044                         return(error);
2045                 }
2046                 ASSERT(nmap == 1);
2047                 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2048                        (map.br_startblock != HOLESTARTBLOCK));
2049
2050                 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2051                 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2052
2053                 bp = xfs_buf_get_flags(mp->m_ddev_targp, dblkno,
2054                                                         blkcnt, XFS_BUF_LOCK);
2055                 ASSERT(bp);
2056                 ASSERT(!XFS_BUF_GETERROR(bp));
2057
2058                 tmp = (valuelen < XFS_BUF_SIZE(bp)) ? valuelen :
2059                                                         XFS_BUF_SIZE(bp);
2060                 xfs_biomove(bp, 0, tmp, src, XFS_B_WRITE);
2061                 if (tmp < XFS_BUF_SIZE(bp))
2062                         xfs_biozero(bp, tmp, XFS_BUF_SIZE(bp) - tmp);
2063                 if ((error = xfs_bwrite(mp, bp))) {/* GROT: NOTE: synchronous write */
2064                         return (error);
2065                 }
2066                 src += tmp;
2067                 valuelen -= tmp;
2068
2069                 lblkno += map.br_blockcount;
2070         }
2071         ASSERT(valuelen == 0);
2072         return(0);
2073 }
2074
2075 /*
2076  * Remove the value associated with an attribute by deleting the
2077  * out-of-line buffer that it is stored on.
2078  */
2079 STATIC int
2080 xfs_attr_rmtval_remove(xfs_da_args_t *args)
2081 {
2082         xfs_mount_t *mp;
2083         xfs_bmbt_irec_t map;
2084         xfs_buf_t *bp;
2085         xfs_daddr_t dblkno;
2086         xfs_dablk_t lblkno;
2087         int valuelen, blkcnt, nmap, error, done, committed;
2088
2089         mp = args->dp->i_mount;
2090
2091         /*
2092          * Roll through the "value", invalidating the attribute value's
2093          * blocks.
2094          */
2095         lblkno = args->rmtblkno;
2096         valuelen = args->rmtblkcnt;
2097         while (valuelen > 0) {
2098                 /*
2099                  * Try to remember where we decided to put the value.
2100                  */
2101                 XFS_BMAP_INIT(args->flist, args->firstblock);
2102                 nmap = 1;
2103                 error = xfs_bmapi(NULL, args->dp, (xfs_fileoff_t)lblkno,
2104                                         args->rmtblkcnt,
2105                                         XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2106                                         args->firstblock, 0, &map, &nmap,
2107                                         args->flist);
2108                 if (error) {
2109                         return(error);
2110                 }
2111                 ASSERT(nmap == 1);
2112                 ASSERT((map.br_startblock != DELAYSTARTBLOCK) &&
2113                        (map.br_startblock != HOLESTARTBLOCK));
2114
2115                 dblkno = XFS_FSB_TO_DADDR(mp, map.br_startblock),
2116                 blkcnt = XFS_FSB_TO_BB(mp, map.br_blockcount);
2117
2118                 /*
2119                  * If the "remote" value is in the cache, remove it.
2120                  */
2121                 bp = xfs_incore(mp->m_ddev_targp, dblkno, blkcnt,
2122                                 XFS_INCORE_TRYLOCK);
2123                 if (bp) {
2124                         XFS_BUF_STALE(bp);
2125                         XFS_BUF_UNDELAYWRITE(bp);
2126                         xfs_buf_relse(bp);
2127                         bp = NULL;
2128                 }
2129
2130                 valuelen -= map.br_blockcount;
2131
2132                 lblkno += map.br_blockcount;
2133         }
2134
2135         /*
2136          * Keep de-allocating extents until the remote-value region is gone.
2137          */
2138         lblkno = args->rmtblkno;
2139         blkcnt = args->rmtblkcnt;
2140         done = 0;
2141         while (!done) {
2142                 XFS_BMAP_INIT(args->flist, args->firstblock);
2143                 error = xfs_bunmapi(args->trans, args->dp, lblkno, blkcnt,
2144                                     XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,
2145                                     1, args->firstblock, args->flist, &done);
2146                 if (!error) {
2147                         error = xfs_bmap_finish(&args->trans, args->flist,
2148                                                 *args->firstblock, &committed);
2149                 }
2150                 if (error) {
2151                         ASSERT(committed);
2152                         args->trans = NULL;
2153                         xfs_bmap_cancel(args->flist);
2154                         return(error);
2155                 }
2156
2157                 /*
2158                  * bmap_finish() may have committed the last trans and started
2159                  * a new one.  We need the inode to be in all transactions.
2160                  */
2161                 if (committed) {
2162                         xfs_trans_ijoin(args->trans, args->dp, XFS_ILOCK_EXCL);
2163                         xfs_trans_ihold(args->trans, args->dp);
2164                 }
2165
2166                 /*
2167                  * Close out trans and start the next one in the chain.
2168                  */
2169                 if ((error = xfs_attr_rolltrans(&args->trans, args->dp)))
2170                         return (error);
2171         }
2172         return(0);
2173 }
2174
2175 #if defined(XFS_ATTR_TRACE)
2176 /*
2177  * Add a trace buffer entry for an attr_list context structure.
2178  */
2179 void
2180 xfs_attr_trace_l_c(char *where, struct xfs_attr_list_context *context)
2181 {
2182         xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_C, where,
2183                 (__psunsigned_t)context->dp,
2184                 (__psunsigned_t)context->cursor->hashval,
2185                 (__psunsigned_t)context->cursor->blkno,
2186                 (__psunsigned_t)context->cursor->offset,
2187                 (__psunsigned_t)context->alist,
2188                 (__psunsigned_t)context->bufsize,
2189                 (__psunsigned_t)context->count,
2190                 (__psunsigned_t)context->firstu,
2191                 (__psunsigned_t)
2192                         ((context->count > 0) &&
2193                         !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2194                                 ? (ATTR_ENTRY(context->alist,
2195                                               context->count-1)->a_valuelen)
2196                                 : 0,
2197                 (__psunsigned_t)context->dupcnt,
2198                 (__psunsigned_t)context->flags,
2199                 (__psunsigned_t)NULL,
2200                 (__psunsigned_t)NULL,
2201                 (__psunsigned_t)NULL);
2202 }
2203
2204 /*
2205  * Add a trace buffer entry for a context structure and a Btree node.
2206  */
2207 void
2208 xfs_attr_trace_l_cn(char *where, struct xfs_attr_list_context *context,
2209                          struct xfs_da_intnode *node)
2210 {
2211         xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CN, where,
2212                 (__psunsigned_t)context->dp,
2213                 (__psunsigned_t)context->cursor->hashval,
2214                 (__psunsigned_t)context->cursor->blkno,
2215                 (__psunsigned_t)context->cursor->offset,
2216                 (__psunsigned_t)context->alist,
2217                 (__psunsigned_t)context->bufsize,
2218                 (__psunsigned_t)context->count,
2219                 (__psunsigned_t)context->firstu,
2220                 (__psunsigned_t)
2221                         ((context->count > 0) &&
2222                         !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2223                                 ? (ATTR_ENTRY(context->alist,
2224                                               context->count-1)->a_valuelen)
2225                                 : 0,
2226                 (__psunsigned_t)context->dupcnt,
2227                 (__psunsigned_t)context->flags,
2228                 (__psunsigned_t)be16_to_cpu(node->hdr.count),
2229                 (__psunsigned_t)be32_to_cpu(node->btree[0].hashval),
2230                 (__psunsigned_t)be32_to_cpu(node->btree[
2231                                     be16_to_cpu(node->hdr.count)-1].hashval));
2232 }
2233
2234 /*
2235  * Add a trace buffer entry for a context structure and a Btree element.
2236  */
2237 void
2238 xfs_attr_trace_l_cb(char *where, struct xfs_attr_list_context *context,
2239                           struct xfs_da_node_entry *btree)
2240 {
2241         xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CB, where,
2242                 (__psunsigned_t)context->dp,
2243                 (__psunsigned_t)context->cursor->hashval,
2244                 (__psunsigned_t)context->cursor->blkno,
2245                 (__psunsigned_t)context->cursor->offset,
2246                 (__psunsigned_t)context->alist,
2247                 (__psunsigned_t)context->bufsize,
2248                 (__psunsigned_t)context->count,
2249                 (__psunsigned_t)context->firstu,
2250                 (__psunsigned_t)
2251                         ((context->count > 0) &&
2252                         !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2253                                 ? (ATTR_ENTRY(context->alist,
2254                                               context->count-1)->a_valuelen)
2255                                 : 0,
2256                 (__psunsigned_t)context->dupcnt,
2257                 (__psunsigned_t)context->flags,
2258                 (__psunsigned_t)be32_to_cpu(btree->hashval),
2259                 (__psunsigned_t)be32_to_cpu(btree->before),
2260                 (__psunsigned_t)NULL);
2261 }
2262
2263 /*
2264  * Add a trace buffer entry for a context structure and a leaf block.
2265  */
2266 void
2267 xfs_attr_trace_l_cl(char *where, struct xfs_attr_list_context *context,
2268                               struct xfs_attr_leafblock *leaf)
2269 {
2270         xfs_attr_trace_enter(XFS_ATTR_KTRACE_L_CL, where,
2271                 (__psunsigned_t)context->dp,
2272                 (__psunsigned_t)context->cursor->hashval,
2273                 (__psunsigned_t)context->cursor->blkno,
2274                 (__psunsigned_t)context->cursor->offset,
2275                 (__psunsigned_t)context->alist,
2276                 (__psunsigned_t)context->bufsize,
2277                 (__psunsigned_t)context->count,
2278                 (__psunsigned_t)context->firstu,
2279                 (__psunsigned_t)
2280                         ((context->count > 0) &&
2281                         !(context->flags & (ATTR_KERNAMELS|ATTR_KERNOVAL)))
2282                                 ? (ATTR_ENTRY(context->alist,
2283                                               context->count-1)->a_valuelen)
2284                                 : 0,
2285                 (__psunsigned_t)context->dupcnt,
2286                 (__psunsigned_t)context->flags,
2287                 (__psunsigned_t)be16_to_cpu(leaf->hdr.count),
2288                 (__psunsigned_t)be32_to_cpu(leaf->entries[0].hashval),
2289                 (__psunsigned_t)be32_to_cpu(leaf->entries[
2290                                 be16_to_cpu(leaf->hdr.count)-1].hashval));
2291 }
2292
2293 /*
2294  * Add a trace buffer entry for the arguments given to the routine,
2295  * generic form.
2296  */
2297 void
2298 xfs_attr_trace_enter(int type, char *where,
2299                          __psunsigned_t a2, __psunsigned_t a3,
2300                          __psunsigned_t a4, __psunsigned_t a5,
2301                          __psunsigned_t a6, __psunsigned_t a7,
2302                          __psunsigned_t a8, __psunsigned_t a9,
2303                          __psunsigned_t a10, __psunsigned_t a11,
2304                          __psunsigned_t a12, __psunsigned_t a13,
2305                          __psunsigned_t a14, __psunsigned_t a15)
2306 {
2307         ASSERT(xfs_attr_trace_buf);
2308         ktrace_enter(xfs_attr_trace_buf, (void *)((__psunsigned_t)type),
2309                                          (void *)where,
2310                                          (void *)a2,  (void *)a3,  (void *)a4,
2311                                          (void *)a5,  (void *)a6,  (void *)a7,
2312                                          (void *)a8,  (void *)a9,  (void *)a10,
2313                                          (void *)a11, (void *)a12, (void *)a13,
2314                                          (void *)a14, (void *)a15);
2315 }
2316 #endif  /* XFS_ATTR_TRACE */
2317
2318
2319 /*========================================================================
2320  * System (pseudo) namespace attribute interface routines.
2321  *========================================================================*/
2322
2323 STATIC int
2324 posix_acl_access_set(
2325         vnode_t *vp, char *name, void *data, size_t size, int xflags)
2326 {
2327         return xfs_acl_vset(vp, data, size, _ACL_TYPE_ACCESS);
2328 }
2329
2330 STATIC int
2331 posix_acl_access_remove(
2332         struct vnode *vp, char *name, int xflags)
2333 {
2334         return xfs_acl_vremove(vp, _ACL_TYPE_ACCESS);
2335 }
2336
2337 STATIC int
2338 posix_acl_access_get(
2339         vnode_t *vp, char *name, void *data, size_t size, int xflags)
2340 {
2341         return xfs_acl_vget(vp, data, size, _ACL_TYPE_ACCESS);
2342 }
2343
2344 STATIC int
2345 posix_acl_access_exists(
2346         vnode_t *vp)
2347 {
2348         return xfs_acl_vhasacl_access(vp);
2349 }
2350
2351 STATIC int
2352 posix_acl_default_set(
2353         vnode_t *vp, char *name, void *data, size_t size, int xflags)
2354 {
2355         return xfs_acl_vset(vp, data, size, _ACL_TYPE_DEFAULT);
2356 }
2357
2358 STATIC int
2359 posix_acl_default_get(
2360         vnode_t *vp, char *name, void *data, size_t size, int xflags)
2361 {
2362         return xfs_acl_vget(vp, data, size, _ACL_TYPE_DEFAULT);
2363 }
2364
2365 STATIC int
2366 posix_acl_default_remove(
2367         struct vnode *vp, char *name, int xflags)
2368 {
2369         return xfs_acl_vremove(vp, _ACL_TYPE_DEFAULT);
2370 }
2371
2372 STATIC int
2373 posix_acl_default_exists(
2374         vnode_t *vp)
2375 {
2376         return xfs_acl_vhasacl_default(vp);
2377 }
2378
2379 STATIC struct attrnames posix_acl_access = {
2380         .attr_name      = "posix_acl_access",
2381         .attr_namelen   = sizeof("posix_acl_access") - 1,
2382         .attr_get       = posix_acl_access_get,
2383         .attr_set       = posix_acl_access_set,
2384         .attr_remove    = posix_acl_access_remove,
2385         .attr_exists    = posix_acl_access_exists,
2386 };
2387
2388 STATIC struct attrnames posix_acl_default = {
2389         .attr_name      = "posix_acl_default",
2390         .attr_namelen   = sizeof("posix_acl_default") - 1,
2391         .attr_get       = posix_acl_default_get,
2392         .attr_set       = posix_acl_default_set,
2393         .attr_remove    = posix_acl_default_remove,
2394         .attr_exists    = posix_acl_default_exists,
2395 };
2396
2397 STATIC struct attrnames *attr_system_names[] =
2398         { &posix_acl_access, &posix_acl_default };
2399
2400
2401 /*========================================================================
2402  * Namespace-prefix-style attribute name interface routines.
2403  *========================================================================*/
2404
2405 STATIC int
2406 attr_generic_set(
2407         struct vnode *vp, char *name, void *data, size_t size, int xflags)
2408 {
2409         int     error;
2410
2411         VOP_ATTR_SET(vp, name, data, size, xflags, NULL, error);
2412         return -error;
2413 }
2414
2415 STATIC int
2416 attr_generic_get(
2417         struct vnode *vp, char *name, void *data, size_t size, int xflags)
2418 {
2419         int     error, asize = size;
2420
2421         VOP_ATTR_GET(vp, name, data, &asize, xflags, NULL, error);
2422         if (!error)
2423                 return asize;
2424         return -error;
2425 }
2426
2427 STATIC int
2428 attr_generic_remove(
2429         struct vnode *vp, char *name, int xflags)
2430 {
2431         int     error;
2432
2433         VOP_ATTR_REMOVE(vp, name, xflags, NULL, error);
2434         return -error;
2435 }
2436
2437 STATIC int
2438 attr_generic_listadd(
2439         attrnames_t             *prefix,
2440         attrnames_t             *namesp,
2441         void                    *data,
2442         size_t                  size,
2443         ssize_t                 *result)
2444 {
2445         char                    *p = data + *result;
2446
2447         *result += prefix->attr_namelen;
2448         *result += namesp->attr_namelen + 1;
2449         if (!size)
2450                 return 0;
2451         if (*result > size)
2452                 return -ERANGE;
2453         strcpy(p, prefix->attr_name);
2454         p += prefix->attr_namelen;
2455         strcpy(p, namesp->attr_name);
2456         p += namesp->attr_namelen + 1;
2457         return 0;
2458 }
2459
2460 STATIC int
2461 attr_system_list(
2462         struct vnode            *vp,
2463         void                    *data,
2464         size_t                  size,
2465         ssize_t                 *result)
2466 {
2467         attrnames_t             *namesp;
2468         int                     i, error = 0;
2469
2470         for (i = 0; i < ATTR_SYSCOUNT; i++) {
2471                 namesp = attr_system_names[i];
2472                 if (!namesp->attr_exists || !namesp->attr_exists(vp))
2473                         continue;
2474                 error = attr_generic_listadd(&attr_system, namesp,
2475                                                 data, size, result);
2476                 if (error)
2477                         break;
2478         }
2479         return error;
2480 }
2481
2482 int
2483 attr_generic_list(
2484         struct vnode *vp, void *data, size_t size, int xflags, ssize_t *result)
2485 {
2486         attrlist_cursor_kern_t  cursor = { 0 };
2487         int                     error;
2488
2489         VOP_ATTR_LIST(vp, data, size, xflags, &cursor, NULL, error);
2490         if (error > 0)
2491                 return -error;
2492         *result = -error;
2493         return attr_system_list(vp, data, size, result);
2494 }
2495
2496 attrnames_t *
2497 attr_lookup_namespace(
2498         char                    *name,
2499         struct attrnames        **names,
2500         int                     nnames)
2501 {
2502         int                     i;
2503
2504         for (i = 0; i < nnames; i++)
2505                 if (!strncmp(name, names[i]->attr_name, names[i]->attr_namelen))
2506                         return names[i];
2507         return NULL;
2508 }
2509
2510 /*
2511  * Some checks to prevent people abusing EAs to get over quota:
2512  * - Don't allow modifying user EAs on devices/symlinks;
2513  * - Don't allow modifying user EAs if sticky bit set;
2514  */
2515 STATIC int
2516 attr_user_capable(
2517         struct vnode    *vp,
2518         cred_t          *cred)
2519 {
2520         struct inode    *inode = vn_to_inode(vp);
2521
2522         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2523                 return -EPERM;
2524         if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode) &&
2525             !capable(CAP_SYS_ADMIN))
2526                 return -EPERM;
2527         if (S_ISDIR(inode->i_mode) && (inode->i_mode & S_ISVTX) &&
2528             (current_fsuid(cred) != inode->i_uid) && !capable(CAP_FOWNER))
2529                 return -EPERM;
2530         return 0;
2531 }
2532
2533 STATIC int
2534 attr_trusted_capable(
2535         struct vnode    *vp,
2536         cred_t          *cred)
2537 {
2538         struct inode    *inode = vn_to_inode(vp);
2539
2540         if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
2541                 return -EPERM;
2542         if (!capable(CAP_SYS_ADMIN))
2543                 return -EPERM;
2544         return 0;
2545 }
2546
2547 STATIC int
2548 attr_secure_capable(
2549         struct vnode    *vp,
2550         cred_t          *cred)
2551 {
2552         return -ENOSECURITY;
2553 }
2554
2555 STATIC int
2556 attr_system_set(
2557         struct vnode *vp, char *name, void *data, size_t size, int xflags)
2558 {
2559         attrnames_t     *namesp;
2560         int             error;
2561
2562         if (xflags & ATTR_CREATE)
2563                 return -EINVAL;
2564
2565         namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2566         if (!namesp)
2567                 return -EOPNOTSUPP;
2568         error = namesp->attr_set(vp, name, data, size, xflags);
2569         if (!error)
2570                 error = vn_revalidate(vp);
2571         return error;
2572 }
2573
2574 STATIC int
2575 attr_system_get(
2576         struct vnode *vp, char *name, void *data, size_t size, int xflags)
2577 {
2578         attrnames_t     *namesp;
2579
2580         namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2581         if (!namesp)
2582                 return -EOPNOTSUPP;
2583         return namesp->attr_get(vp, name, data, size, xflags);
2584 }
2585
2586 STATIC int
2587 attr_system_remove(
2588         struct vnode *vp, char *name, int xflags)
2589 {
2590         attrnames_t     *namesp;
2591
2592         namesp = attr_lookup_namespace(name, attr_system_names, ATTR_SYSCOUNT);
2593         if (!namesp)
2594                 return -EOPNOTSUPP;
2595         return namesp->attr_remove(vp, name, xflags);
2596 }
2597
2598 struct attrnames attr_system = {
2599         .attr_name      = "system.",
2600         .attr_namelen   = sizeof("system.") - 1,
2601         .attr_flag      = ATTR_SYSTEM,
2602         .attr_get       = attr_system_get,
2603         .attr_set       = attr_system_set,
2604         .attr_remove    = attr_system_remove,
2605         .attr_capable   = (attrcapable_t)fs_noerr,
2606 };
2607
2608 struct attrnames attr_trusted = {
2609         .attr_name      = "trusted.",
2610         .attr_namelen   = sizeof("trusted.") - 1,
2611         .attr_flag      = ATTR_ROOT,
2612         .attr_get       = attr_generic_get,
2613         .attr_set       = attr_generic_set,
2614         .attr_remove    = attr_generic_remove,
2615         .attr_capable   = attr_trusted_capable,
2616 };
2617
2618 struct attrnames attr_secure = {
2619         .attr_name      = "security.",
2620         .attr_namelen   = sizeof("security.") - 1,
2621         .attr_flag      = ATTR_SECURE,
2622         .attr_get       = attr_generic_get,
2623         .attr_set       = attr_generic_set,
2624         .attr_remove    = attr_generic_remove,
2625         .attr_capable   = attr_secure_capable,
2626 };
2627
2628 struct attrnames attr_user = {
2629         .attr_name      = "user.",
2630         .attr_namelen   = sizeof("user.") - 1,
2631         .attr_get       = attr_generic_get,
2632         .attr_set       = attr_generic_set,
2633         .attr_remove    = attr_generic_remove,
2634         .attr_capable   = attr_user_capable,
2635 };
2636
2637 struct attrnames *attr_namespaces[] =
2638         { &attr_system, &attr_trusted, &attr_secure, &attr_user };