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

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_inode_item.h"
  38 #include "xfs_alloc.h"
  39 #include "xfs_btree.h"
  40 #include "xfs_btree_trace.h"
  41 #include "xfs_ialloc.h"
  42 #include "xfs_itable.h"
  43 #include "xfs_bmap.h"
  44 #include "xfs_error.h"
  45 #include "xfs_quota.h"
  46
  47 /*
  48  * Prototypes for internal btree functions.
  49  */
  50
  51
  52 STATIC void xfs_bmbt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
  53 STATIC void xfs_bmbt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
  54
  55 #undef EXIT
  56
  57 #define ENTRY   XBT_ENTRY
  58 #define ERROR   XBT_ERROR
  59 #define EXIT    XBT_EXIT
  60
  61 /*
  62  * Keep the XFS_BMBT_TRACE_ names around for now until all code using them
  63  * is converted to be generic and thus switches to the XFS_BTREE_TRACE_ names.
  64  */
  65 #define XFS_BMBT_TRACE_ARGBI(c,b,i) \
  66         XFS_BTREE_TRACE_ARGBI(c,b,i)
  67 #define XFS_BMBT_TRACE_ARGBII(c,b,i,j) \
  68         XFS_BTREE_TRACE_ARGBII(c,b,i,j)
  69 #define XFS_BMBT_TRACE_ARGFFFI(c,o,b,i,j) \
  70         XFS_BTREE_TRACE_ARGFFFI(c,o,b,i,j)
  71 #define XFS_BMBT_TRACE_ARGI(c,i) \
  72         XFS_BTREE_TRACE_ARGI(c,i)
  73 #define XFS_BMBT_TRACE_ARGIFK(c,i,f,s) \
  74         XFS_BTREE_TRACE_ARGIPK(c,i,(union xfs_btree_ptr)f,s)
  75 #define XFS_BMBT_TRACE_ARGIFR(c,i,f,r) \
  76         XFS_BTREE_TRACE_ARGIPR(c,i, \
  77                 (union xfs_btree_ptr)f, (union xfs_btree_rec *)r)
  78 #define XFS_BMBT_TRACE_ARGIK(c,i,k) \
  79         XFS_BTREE_TRACE_ARGIK(c,i,(union xfs_btree_key *)k)
  80 #define XFS_BMBT_TRACE_CURSOR(c,s) \
  81         XFS_BTREE_TRACE_CURSOR(c,s)
  82
  83
  84 /*
  85  * Internal functions.
  86  */
  87
  88 /*
  89  * Delete record pointed to by cur/level.
  90  */
  91 STATIC int                                      /* error */
  92 xfs_bmbt_delrec(
  93         xfs_btree_cur_t         *cur,
  94         int                     level,
  95         int                     *stat)          /* success/failure */
  96 {
  97         xfs_bmbt_block_t        *block;         /* bmap btree block */
  98         xfs_fsblock_t           bno;            /* fs-relative block number */
  99         xfs_buf_t               *bp;            /* buffer for block */
 100         int                     error;          /* error return value */
 101         int                     i;              /* loop counter */
 102         int                     j;              /* temp state */
 103         xfs_bmbt_key_t          key;            /* bmap btree key */
 104         xfs_bmbt_key_t          *kp=NULL;       /* pointer to bmap btree key */
 105         xfs_fsblock_t           lbno;           /* left sibling block number */
 106         xfs_buf_t               *lbp;           /* left buffer pointer */
 107         xfs_bmbt_block_t        *left;          /* left btree block */
 108         xfs_bmbt_key_t          *lkp;           /* left btree key */
 109         xfs_bmbt_ptr_t          *lpp;           /* left address pointer */
 110         int                     lrecs=0;        /* left record count */
 111         xfs_bmbt_rec_t          *lrp;           /* left record pointer */
 112         xfs_mount_t             *mp;            /* file system mount point */
 113         xfs_bmbt_ptr_t          *pp;            /* pointer to bmap block addr */
 114         int                     ptr;            /* key/record index */
 115         xfs_fsblock_t           rbno;           /* right sibling block number */
 116         xfs_buf_t               *rbp;           /* right buffer pointer */
 117         xfs_bmbt_block_t        *right;         /* right btree block */
 118         xfs_bmbt_key_t          *rkp;           /* right btree key */
 119         xfs_bmbt_rec_t          *rp;            /* pointer to bmap btree rec */
 120         xfs_bmbt_ptr_t          *rpp;           /* right address pointer */
 121         xfs_bmbt_block_t        *rrblock;       /* right-right btree block */
 122         xfs_buf_t               *rrbp;          /* right-right buffer pointer */
 123         int                     rrecs=0;        /* right record count */
 124         xfs_bmbt_rec_t          *rrp;           /* right record pointer */
 125         xfs_btree_cur_t         *tcur;          /* temporary btree cursor */
 126         int                     numrecs;        /* temporary numrec count */
 127         int                     numlrecs, numrrecs;
 128
 129         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 130         XFS_BMBT_TRACE_ARGI(cur, level);
 131         ptr = cur->bc_ptrs[level];
 132         tcur = NULL;
 133         if (ptr == 0) {
 134                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 135                 *stat = 0;
 136                 return 0;
 137         }
 138         block = xfs_bmbt_get_block(cur, level, &bp);
 139         numrecs = be16_to_cpu(block->bb_numrecs);
 140 #ifdef DEBUG
 141         if ((error = xfs_btree_check_lblock(cur, block, level, bp))) {
 142                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 143                 goto error0;
 144         }
 145 #endif
 146         if (ptr > numrecs) {
 147                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 148                 *stat = 0;
 149                 return 0;
 150         }
 151         XFS_STATS_INC(xs_bmbt_delrec);
 152         if (level > 0) {
 153                 kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
 154                 pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
 155 #ifdef DEBUG
 156                 for (i = ptr; i < numrecs; i++) {
 157                         if ((error = xfs_btree_check_lptr_disk(cur, pp[i], level))) {
 158                                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 159                                 goto error0;
 160                         }
 161                 }
 162 #endif
 163                 if (ptr < numrecs) {
 164                         memmove(&kp[ptr - 1], &kp[ptr],
 165                                 (numrecs - ptr) * sizeof(*kp));
 166                         memmove(&pp[ptr - 1], &pp[ptr],
 167                                 (numrecs - ptr) * sizeof(*pp));
 168                         xfs_bmbt_log_ptrs(cur, bp, ptr, numrecs - 1);
 169                         xfs_bmbt_log_keys(cur, bp, ptr, numrecs - 1);
 170                 }
 171         } else {
 172                 rp = XFS_BMAP_REC_IADDR(block, 1, cur);
 173                 if (ptr < numrecs) {
 174                         memmove(&rp[ptr - 1], &rp[ptr],
 175                                 (numrecs - ptr) * sizeof(*rp));
 176                         xfs_bmbt_log_recs(cur, bp, ptr, numrecs - 1);
 177                 }
 178                 if (ptr == 1) {
 179                         key.br_startoff =
 180                                 cpu_to_be64(xfs_bmbt_disk_get_startoff(rp));
 181                         kp = &key;
 182                 }
 183         }
 184         numrecs--;
 185         block->bb_numrecs = cpu_to_be16(numrecs);
 186         xfs_bmbt_log_block(cur, bp, XFS_BB_NUMRECS);
 187         /*
 188          * We're at the root level.
 189          * First, shrink the root block in-memory.
 190          * Try to get rid of the next level down.
 191          * If we can't then there's nothing left to do.
 192          */
 193         if (level == cur->bc_nlevels - 1) {
 194                 xfs_iroot_realloc(cur->bc_private.b.ip, -1,
 195                         cur->bc_private.b.whichfork);
 196                 if ((error = xfs_btree_kill_iroot(cur))) {
 197                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 198                         goto error0;
 199                 }
 200                 if (level > 0 && (error = xfs_btree_decrement(cur, level, &j))) {
 201                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 202                         goto error0;
 203                 }
 204                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 205                 *stat = 1;
 206                 return 0;
 207         }
 208         if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1))) {
 209                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 210                 goto error0;
 211         }
 212         if (numrecs >= XFS_BMAP_BLOCK_IMINRECS(level, cur)) {
 213                 if (level > 0 && (error = xfs_btree_decrement(cur, level, &j))) {
 214                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 215                         goto error0;
 216                 }
 217                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 218                 *stat = 1;
 219                 return 0;
 220         }
 221         rbno = be64_to_cpu(block->bb_rightsib);
 222         lbno = be64_to_cpu(block->bb_leftsib);
 223         /*
 224          * One child of root, need to get a chance to copy its contents
 225          * into the root and delete it. Can't go up to next level,
 226          * there's nothing to delete there.
 227          */
 228         if (lbno == NULLFSBLOCK && rbno == NULLFSBLOCK &&
 229             level == cur->bc_nlevels - 2) {
 230                 if ((error = xfs_btree_kill_iroot(cur))) {
 231                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 232                         goto error0;
 233                 }
 234                 if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) {
 235                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 236                         goto error0;
 237                 }
 238                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 239                 *stat = 1;
 240                 return 0;
 241         }
 242         ASSERT(rbno != NULLFSBLOCK || lbno != NULLFSBLOCK);
 243         if ((error = xfs_btree_dup_cursor(cur, &tcur))) {
 244                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 245                 goto error0;
 246         }
 247         bno = NULLFSBLOCK;
 248         if (rbno != NULLFSBLOCK) {
 249                 i = xfs_btree_lastrec(tcur, level);
 250                 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 251                 if ((error = xfs_btree_increment(tcur, level, &i))) {
 252                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 253                         goto error0;
 254                 }
 255                 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 256                 i = xfs_btree_lastrec(tcur, level);
 257                 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 258                 rbp = tcur->bc_bufs[level];
 259                 right = XFS_BUF_TO_BMBT_BLOCK(rbp);
 260 #ifdef DEBUG
 261                 if ((error = xfs_btree_check_lblock(cur, right, level, rbp))) {
 262                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 263                         goto error0;
 264                 }
 265 #endif
 266                 bno = be64_to_cpu(right->bb_leftsib);
 267                 if (be16_to_cpu(right->bb_numrecs) - 1 >=
 268                     XFS_BMAP_BLOCK_IMINRECS(level, cur)) {
 269                         if ((error = xfs_btree_lshift(tcur, level, &i))) {
 270                                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 271                                 goto error0;
 272                         }
 273                         if (i) {
 274                                 ASSERT(be16_to_cpu(block->bb_numrecs) >=
 275                                        XFS_BMAP_BLOCK_IMINRECS(level, tcur));
 276                                 xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
 277                                 tcur = NULL;
 278                                 if (level > 0) {
 279                                         if ((error = xfs_btree_decrement(cur,
 280                                                         level, &i))) {
 281                                                 XFS_BMBT_TRACE_CURSOR(cur,
 282                                                         ERROR);
 283                                                 goto error0;
 284                                         }
 285                                 }
 286                                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 287                                 *stat = 1;
 288                                 return 0;
 289                         }
 290                 }
 291                 rrecs = be16_to_cpu(right->bb_numrecs);
 292                 if (lbno != NULLFSBLOCK) {
 293                         i = xfs_btree_firstrec(tcur, level);
 294                         XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 295                         if ((error = xfs_btree_decrement(tcur, level, &i))) {
 296                                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 297                                 goto error0;
 298                         }
 299                         XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 300                 }
 301         }
 302         if (lbno != NULLFSBLOCK) {
 303                 i = xfs_btree_firstrec(tcur, level);
 304                 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 305                 /*
 306                  * decrement to last in block
 307                  */
 308                 if ((error = xfs_btree_decrement(tcur, level, &i))) {
 309                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 310                         goto error0;
 311                 }
 312                 i = xfs_btree_firstrec(tcur, level);
 313                 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
 314                 lbp = tcur->bc_bufs[level];
 315                 left = XFS_BUF_TO_BMBT_BLOCK(lbp);
 316 #ifdef DEBUG
 317                 if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) {
 318                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 319                         goto error0;
 320                 }
 321 #endif
 322                 bno = be64_to_cpu(left->bb_rightsib);
 323                 if (be16_to_cpu(left->bb_numrecs) - 1 >=
 324                     XFS_BMAP_BLOCK_IMINRECS(level, cur)) {
 325                         if ((error = xfs_btree_rshift(tcur, level, &i))) {
 326                                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 327                                 goto error0;
 328                         }
 329                         if (i) {
 330                                 ASSERT(be16_to_cpu(block->bb_numrecs) >=
 331                                        XFS_BMAP_BLOCK_IMINRECS(level, tcur));
 332                                 xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
 333                                 tcur = NULL;
 334                                 if (level == 0)
 335                                         cur->bc_ptrs[0]++;
 336                                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 337                                 *stat = 1;
 338                                 return 0;
 339                         }
 340                 }
 341                 lrecs = be16_to_cpu(left->bb_numrecs);
 342         }
 343         xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
 344         tcur = NULL;
 345         mp = cur->bc_mp;
 346         ASSERT(bno != NULLFSBLOCK);
 347         if (lbno != NULLFSBLOCK &&
 348             lrecs + be16_to_cpu(block->bb_numrecs) <= XFS_BMAP_BLOCK_IMAXRECS(level, cur)) {
 349                 rbno = bno;
 350                 right = block;
 351                 rbp = bp;
 352                 if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, lbno, 0, &lbp,
 353                                 XFS_BMAP_BTREE_REF))) {
 354                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 355                         goto error0;
 356                 }
 357                 left = XFS_BUF_TO_BMBT_BLOCK(lbp);
 358                 if ((error = xfs_btree_check_lblock(cur, left, level, lbp))) {
 359                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 360                         goto error0;
 361                 }
 362         } else if (rbno != NULLFSBLOCK &&
 363                    rrecs + be16_to_cpu(block->bb_numrecs) <=
 364                    XFS_BMAP_BLOCK_IMAXRECS(level, cur)) {
 365                 lbno = bno;
 366                 left = block;
 367                 lbp = bp;
 368                 if ((error = xfs_btree_read_bufl(mp, cur->bc_tp, rbno, 0, &rbp,
 369                                 XFS_BMAP_BTREE_REF))) {
 370                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 371                         goto error0;
 372                 }
 373                 right = XFS_BUF_TO_BMBT_BLOCK(rbp);
 374                 if ((error = xfs_btree_check_lblock(cur, right, level, rbp))) {
 375                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 376                         goto error0;
 377                 }
 378                 lrecs = be16_to_cpu(left->bb_numrecs);
 379         } else {
 380                 if (level > 0 && (error = xfs_btree_decrement(cur, level, &i))) {
 381                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 382                         goto error0;
 383                 }
 384                 XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 385                 *stat = 1;
 386                 return 0;
 387         }
 388         numlrecs = be16_to_cpu(left->bb_numrecs);
 389         numrrecs = be16_to_cpu(right->bb_numrecs);
 390         if (level > 0) {
 391                 lkp = XFS_BMAP_KEY_IADDR(left, numlrecs + 1, cur);
 392                 lpp = XFS_BMAP_PTR_IADDR(left, numlrecs + 1, cur);
 393                 rkp = XFS_BMAP_KEY_IADDR(right, 1, cur);
 394                 rpp = XFS_BMAP_PTR_IADDR(right, 1, cur);
 395 #ifdef DEBUG
 396                 for (i = 0; i < numrrecs; i++) {
 397                         if ((error = xfs_btree_check_lptr_disk(cur, rpp[i], level))) {
 398                                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 399                                 goto error0;
 400                         }
 401                 }
 402 #endif
 403                 memcpy(lkp, rkp, numrrecs * sizeof(*lkp));
 404                 memcpy(lpp, rpp, numrrecs * sizeof(*lpp));
 405                 xfs_bmbt_log_keys(cur, lbp, numlrecs + 1, numlrecs + numrrecs);
 406                 xfs_bmbt_log_ptrs(cur, lbp, numlrecs + 1, numlrecs + numrrecs);
 407         } else {
 408                 lrp = XFS_BMAP_REC_IADDR(left, numlrecs + 1, cur);
 409                 rrp = XFS_BMAP_REC_IADDR(right, 1, cur);
 410                 memcpy(lrp, rrp, numrrecs * sizeof(*lrp));
 411                 xfs_bmbt_log_recs(cur, lbp, numlrecs + 1, numlrecs + numrrecs);
 412         }
 413         be16_add_cpu(&left->bb_numrecs, numrrecs);
 414         left->bb_rightsib = right->bb_rightsib;
 415         xfs_bmbt_log_block(cur, lbp, XFS_BB_RIGHTSIB | XFS_BB_NUMRECS);
 416         if (be64_to_cpu(left->bb_rightsib) != NULLDFSBNO) {
 417                 if ((error = xfs_btree_read_bufl(mp, cur->bc_tp,
 418                                 be64_to_cpu(left->bb_rightsib),
 419                                 0, &rrbp, XFS_BMAP_BTREE_REF))) {
 420                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 421                         goto error0;
 422                 }
 423                 rrblock = XFS_BUF_TO_BMBT_BLOCK(rrbp);
 424                 if ((error = xfs_btree_check_lblock(cur, rrblock, level, rrbp))) {
 425                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 426                         goto error0;
 427                 }
 428                 rrblock->bb_leftsib = cpu_to_be64(lbno);
 429                 xfs_bmbt_log_block(cur, rrbp, XFS_BB_LEFTSIB);
 430         }
 431         xfs_bmap_add_free(XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(rbp)), 1,
 432                 cur->bc_private.b.flist, mp);
 433         cur->bc_private.b.ip->i_d.di_nblocks--;
 434         xfs_trans_log_inode(cur->bc_tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
 435         XFS_TRANS_MOD_DQUOT_BYINO(mp, cur->bc_tp, cur->bc_private.b.ip,
 436                         XFS_TRANS_DQ_BCOUNT, -1L);
 437         xfs_trans_binval(cur->bc_tp, rbp);
 438         if (bp != lbp) {
 439                 cur->bc_bufs[level] = lbp;
 440                 cur->bc_ptrs[level] += lrecs;
 441                 cur->bc_ra[level] = 0;
 442         } else if ((error = xfs_btree_increment(cur, level + 1, &i))) {
 443                 XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 444                 goto error0;
 445         }
 446         if (level > 0)
 447                 cur->bc_ptrs[level]--;
 448         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 449         *stat = 2;
 450         return 0;
 451
 452 error0:
 453         if (tcur)
 454                 xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
 455         return error;
 456 }
 457
 458 /*
 459  * Log key values from the btree block.
 460  */
 461 STATIC void
 462 xfs_bmbt_log_keys(
 463         xfs_btree_cur_t *cur,
 464         xfs_buf_t       *bp,
 465         int             kfirst,
 466         int             klast)
 467 {
 468         xfs_trans_t     *tp;
 469
 470         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 471         XFS_BMBT_TRACE_ARGBII(cur, bp, kfirst, klast);
 472         tp = cur->bc_tp;
 473         if (bp) {
 474                 xfs_bmbt_block_t        *block;
 475                 int                     first;
 476                 xfs_bmbt_key_t          *kp;
 477                 int                     last;
 478
 479                 block = XFS_BUF_TO_BMBT_BLOCK(bp);
 480                 kp = XFS_BMAP_KEY_DADDR(block, 1, cur);
 481                 first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
 482                 last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
 483                 xfs_trans_log_buf(tp, bp, first, last);
 484         } else {
 485                 xfs_inode_t              *ip;
 486
 487                 ip = cur->bc_private.b.ip;
 488                 xfs_trans_log_inode(tp, ip,
 489                         XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
 490         }
 491         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 492 }
 493
 494 /*
 495  * Log pointer values from the btree block.
 496  */
 497 STATIC void
 498 xfs_bmbt_log_ptrs(
 499         xfs_btree_cur_t *cur,
 500         xfs_buf_t       *bp,
 501         int             pfirst,
 502         int             plast)
 503 {
 504         xfs_trans_t     *tp;
 505
 506         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 507         XFS_BMBT_TRACE_ARGBII(cur, bp, pfirst, plast);
 508         tp = cur->bc_tp;
 509         if (bp) {
 510                 xfs_bmbt_block_t        *block;
 511                 int                     first;
 512                 int                     last;
 513                 xfs_bmbt_ptr_t          *pp;
 514
 515                 block = XFS_BUF_TO_BMBT_BLOCK(bp);
 516                 pp = XFS_BMAP_PTR_DADDR(block, 1, cur);
 517                 first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
 518                 last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
 519                 xfs_trans_log_buf(tp, bp, first, last);
 520         } else {
 521                 xfs_inode_t             *ip;
 522
 523                 ip = cur->bc_private.b.ip;
 524                 xfs_trans_log_inode(tp, ip,
 525                         XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
 526         }
 527         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 528 }
 529
 530 /*
 531  * Determine the extent state.
 532  */
 533 /* ARGSUSED */
 534 STATIC xfs_exntst_t
 535 xfs_extent_state(
 536         xfs_filblks_t           blks,
 537         int                     extent_flag)
 538 {
 539         if (extent_flag) {
 540                 ASSERT(blks != 0);      /* saved for DMIG */
 541                 return XFS_EXT_UNWRITTEN;
 542         }
 543         return XFS_EXT_NORM;
 544 }
 545
 546 /*
 547  * Convert on-disk form of btree root to in-memory form.
 548  */
 549 void
 550 xfs_bmdr_to_bmbt(
 551         xfs_bmdr_block_t        *dblock,
 552         int                     dblocklen,
 553         xfs_bmbt_block_t        *rblock,
 554         int                     rblocklen)
 555 {
 556         int                     dmxr;
 557         xfs_bmbt_key_t          *fkp;
 558         __be64                  *fpp;
 559         xfs_bmbt_key_t          *tkp;
 560         __be64                  *tpp;
 561
 562         rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
 563         rblock->bb_level = dblock->bb_level;
 564         ASSERT(be16_to_cpu(rblock->bb_level) > 0);
 565         rblock->bb_numrecs = dblock->bb_numrecs;
 566         rblock->bb_leftsib = cpu_to_be64(NULLDFSBNO);
 567         rblock->bb_rightsib = cpu_to_be64(NULLDFSBNO);
 568         dmxr = (int)XFS_BTREE_BLOCK_MAXRECS(dblocklen, xfs_bmdr, 0);
 569         fkp = XFS_BTREE_KEY_ADDR(xfs_bmdr, dblock, 1);
 570         tkp = XFS_BMAP_BROOT_KEY_ADDR(rblock, 1, rblocklen);
 571         fpp = XFS_BTREE_PTR_ADDR(xfs_bmdr, dblock, 1, dmxr);
 572         tpp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, rblocklen);
 573         dmxr = be16_to_cpu(dblock->bb_numrecs);
 574         memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
 575         memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
 576 }
 577
 578 /*
 579  * Delete the record pointed to by cur.
 580  */
 581 int                                     /* error */
 582 xfs_bmbt_delete(
 583         xfs_btree_cur_t *cur,
 584         int             *stat)          /* success/failure */
 585 {
 586         int             error;          /* error return value */
 587         int             i;
 588         int             level;
 589
 590         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 591         for (level = 0, i = 2; i == 2; level++) {
 592                 if ((error = xfs_bmbt_delrec(cur, level, &i))) {
 593                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 594                         return error;
 595                 }
 596         }
 597         if (i == 0) {
 598                 for (level = 1; level < cur->bc_nlevels; level++) {
 599                         if (cur->bc_ptrs[level] == 0) {
 600                                 if ((error = xfs_btree_decrement(cur, level,
 601                                                 &i))) {
 602                                         XFS_BMBT_TRACE_CURSOR(cur, ERROR);
 603                                         return error;
 604                                 }
 605                                 break;
 606                         }
 607                 }
 608         }
 609         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 610         *stat = i;
 611         return 0;
 612 }
 613
 614 /*
 615  * Convert a compressed bmap extent record to an uncompressed form.
 616  * This code must be in sync with the routines xfs_bmbt_get_startoff,
 617  * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
 618  */
 619
 620 STATIC_INLINE void
 621 __xfs_bmbt_get_all(
 622                 __uint64_t l0,
 623                 __uint64_t l1,
 624                 xfs_bmbt_irec_t *s)
 625 {
 626         int     ext_flag;
 627         xfs_exntst_t st;
 628
 629         ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
 630         s->br_startoff = ((xfs_fileoff_t)l0 &
 631                            XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 632 #if XFS_BIG_BLKNOS
 633         s->br_startblock = (((xfs_fsblock_t)l0 & XFS_MASK64LO(9)) << 43) |
 634                            (((xfs_fsblock_t)l1) >> 21);
 635 #else
 636 #ifdef DEBUG
 637         {
 638                 xfs_dfsbno_t    b;
 639
 640                 b = (((xfs_dfsbno_t)l0 & XFS_MASK64LO(9)) << 43) |
 641                     (((xfs_dfsbno_t)l1) >> 21);
 642                 ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
 643                 s->br_startblock = (xfs_fsblock_t)b;
 644         }
 645 #else   /* !DEBUG */
 646         s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
 647 #endif  /* DEBUG */
 648 #endif  /* XFS_BIG_BLKNOS */
 649         s->br_blockcount = (xfs_filblks_t)(l1 & XFS_MASK64LO(21));
 650         /* This is xfs_extent_state() in-line */
 651         if (ext_flag) {
 652                 ASSERT(s->br_blockcount != 0);  /* saved for DMIG */
 653                 st = XFS_EXT_UNWRITTEN;
 654         } else
 655                 st = XFS_EXT_NORM;
 656         s->br_state = st;
 657 }
 658
 659 void
 660 xfs_bmbt_get_all(
 661         xfs_bmbt_rec_host_t *r,
 662         xfs_bmbt_irec_t *s)
 663 {
 664         __xfs_bmbt_get_all(r->l0, r->l1, s);
 665 }
 666
 667 /*
 668  * Get the block pointer for the given level of the cursor.
 669  * Fill in the buffer pointer, if applicable.
 670  */
 671 xfs_bmbt_block_t *
 672 xfs_bmbt_get_block(
 673         xfs_btree_cur_t         *cur,
 674         int                     level,
 675         xfs_buf_t               **bpp)
 676 {
 677         xfs_ifork_t             *ifp;
 678         xfs_bmbt_block_t        *rval;
 679
 680         if (level < cur->bc_nlevels - 1) {
 681                 *bpp = cur->bc_bufs[level];
 682                 rval = XFS_BUF_TO_BMBT_BLOCK(*bpp);
 683         } else {
 684                 *bpp = NULL;
 685                 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
 686                         cur->bc_private.b.whichfork);
 687                 rval = ifp->if_broot;
 688         }
 689         return rval;
 690 }
 691
 692 /*
 693  * Extract the blockcount field from an in memory bmap extent record.
 694  */
 695 xfs_filblks_t
 696 xfs_bmbt_get_blockcount(
 697         xfs_bmbt_rec_host_t     *r)
 698 {
 699         return (xfs_filblks_t)(r->l1 & XFS_MASK64LO(21));
 700 }
 701
 702 /*
 703  * Extract the startblock field from an in memory bmap extent record.
 704  */
 705 xfs_fsblock_t
 706 xfs_bmbt_get_startblock(
 707         xfs_bmbt_rec_host_t     *r)
 708 {
 709 #if XFS_BIG_BLKNOS
 710         return (((xfs_fsblock_t)r->l0 & XFS_MASK64LO(9)) << 43) |
 711                (((xfs_fsblock_t)r->l1) >> 21);
 712 #else
 713 #ifdef DEBUG
 714         xfs_dfsbno_t    b;
 715
 716         b = (((xfs_dfsbno_t)r->l0 & XFS_MASK64LO(9)) << 43) |
 717             (((xfs_dfsbno_t)r->l1) >> 21);
 718         ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
 719         return (xfs_fsblock_t)b;
 720 #else   /* !DEBUG */
 721         return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
 722 #endif  /* DEBUG */
 723 #endif  /* XFS_BIG_BLKNOS */
 724 }
 725
 726 /*
 727  * Extract the startoff field from an in memory bmap extent record.
 728  */
 729 xfs_fileoff_t
 730 xfs_bmbt_get_startoff(
 731         xfs_bmbt_rec_host_t     *r)
 732 {
 733         return ((xfs_fileoff_t)r->l0 &
 734                  XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 735 }
 736
 737 xfs_exntst_t
 738 xfs_bmbt_get_state(
 739         xfs_bmbt_rec_host_t     *r)
 740 {
 741         int     ext_flag;
 742
 743         ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
 744         return xfs_extent_state(xfs_bmbt_get_blockcount(r),
 745                                 ext_flag);
 746 }
 747
 748 /* Endian flipping versions of the bmbt extraction functions */
 749 void
 750 xfs_bmbt_disk_get_all(
 751         xfs_bmbt_rec_t  *r,
 752         xfs_bmbt_irec_t *s)
 753 {
 754         __xfs_bmbt_get_all(be64_to_cpu(r->l0), be64_to_cpu(r->l1), s);
 755 }
 756
 757 /*
 758  * Extract the blockcount field from an on disk bmap extent record.
 759  */
 760 xfs_filblks_t
 761 xfs_bmbt_disk_get_blockcount(
 762         xfs_bmbt_rec_t  *r)
 763 {
 764         return (xfs_filblks_t)(be64_to_cpu(r->l1) & XFS_MASK64LO(21));
 765 }
 766
 767 /*
 768  * Extract the startoff field from a disk format bmap extent record.
 769  */
 770 xfs_fileoff_t
 771 xfs_bmbt_disk_get_startoff(
 772         xfs_bmbt_rec_t  *r)
 773 {
 774         return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
 775                  XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 776 }
 777
 778 /*
 779  * Log fields from the btree block header.
 780  */
 781 void
 782 xfs_bmbt_log_block(
 783         xfs_btree_cur_t         *cur,
 784         xfs_buf_t               *bp,
 785         int                     fields)
 786 {
 787         int                     first;
 788         int                     last;
 789         xfs_trans_t             *tp;
 790         static const short      offsets[] = {
 791                 offsetof(xfs_bmbt_block_t, bb_magic),
 792                 offsetof(xfs_bmbt_block_t, bb_level),
 793                 offsetof(xfs_bmbt_block_t, bb_numrecs),
 794                 offsetof(xfs_bmbt_block_t, bb_leftsib),
 795                 offsetof(xfs_bmbt_block_t, bb_rightsib),
 796                 sizeof(xfs_bmbt_block_t)
 797         };
 798
 799         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 800         XFS_BMBT_TRACE_ARGBI(cur, bp, fields);
 801         tp = cur->bc_tp;
 802         if (bp) {
 803                 xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first,
 804                                   &last);
 805                 xfs_trans_log_buf(tp, bp, first, last);
 806         } else
 807                 xfs_trans_log_inode(tp, cur->bc_private.b.ip,
 808                         XFS_ILOG_FBROOT(cur->bc_private.b.whichfork));
 809         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 810 }
 811
 812 /*
 813  * Log record values from the btree block.
 814  */
 815 void
 816 xfs_bmbt_log_recs(
 817         xfs_btree_cur_t         *cur,
 818         xfs_buf_t               *bp,
 819         int                     rfirst,
 820         int                     rlast)
 821 {
 822         xfs_bmbt_block_t        *block;
 823         int                     first;
 824         int                     last;
 825         xfs_bmbt_rec_t          *rp;
 826         xfs_trans_t             *tp;
 827
 828         XFS_BMBT_TRACE_CURSOR(cur, ENTRY);
 829         XFS_BMBT_TRACE_ARGBII(cur, bp, rfirst, rlast);
 830         ASSERT(bp);
 831         tp = cur->bc_tp;
 832         block = XFS_BUF_TO_BMBT_BLOCK(bp);
 833         rp = XFS_BMAP_REC_DADDR(block, 1, cur);
 834         first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
 835         last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
 836         xfs_trans_log_buf(tp, bp, first, last);
 837         XFS_BMBT_TRACE_CURSOR(cur, EXIT);
 838 }
 839
 840 /*
 841  * Set all the fields in a bmap extent record from the arguments.
 842  */
 843 void
 844 xfs_bmbt_set_allf(
 845         xfs_bmbt_rec_host_t     *r,
 846         xfs_fileoff_t           startoff,
 847         xfs_fsblock_t           startblock,
 848         xfs_filblks_t           blockcount,
 849         xfs_exntst_t            state)
 850 {
 851         int             extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
 852
 853         ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
 854         ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
 855         ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
 856
 857 #if XFS_BIG_BLKNOS
 858         ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
 859
 860         r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 861                 ((xfs_bmbt_rec_base_t)startoff << 9) |
 862                 ((xfs_bmbt_rec_base_t)startblock >> 43);
 863         r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
 864                 ((xfs_bmbt_rec_base_t)blockcount &
 865                 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
 866 #else   /* !XFS_BIG_BLKNOS */
 867         if (ISNULLSTARTBLOCK(startblock)) {
 868                 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 869                         ((xfs_bmbt_rec_base_t)startoff << 9) |
 870                          (xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
 871                 r->l1 = XFS_MASK64HI(11) |
 872                           ((xfs_bmbt_rec_base_t)startblock << 21) |
 873                           ((xfs_bmbt_rec_base_t)blockcount &
 874                            (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
 875         } else {
 876                 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 877                         ((xfs_bmbt_rec_base_t)startoff << 9);
 878                 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
 879                          ((xfs_bmbt_rec_base_t)blockcount &
 880                          (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
 881         }
 882 #endif  /* XFS_BIG_BLKNOS */
 883 }
 884
 885 /*
 886  * Set all the fields in a bmap extent record from the uncompressed form.
 887  */
 888 void
 889 xfs_bmbt_set_all(
 890         xfs_bmbt_rec_host_t *r,
 891         xfs_bmbt_irec_t *s)
 892 {
 893         xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
 894                              s->br_blockcount, s->br_state);
 895 }
 896
 897
 898 /*
 899  * Set all the fields in a disk format bmap extent record from the arguments.
 900  */
 901 void
 902 xfs_bmbt_disk_set_allf(
 903         xfs_bmbt_rec_t          *r,
 904         xfs_fileoff_t           startoff,
 905         xfs_fsblock_t           startblock,
 906         xfs_filblks_t           blockcount,
 907         xfs_exntst_t            state)
 908 {
 909         int                     extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
 910
 911         ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
 912         ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
 913         ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
 914
 915 #if XFS_BIG_BLKNOS
 916         ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
 917
 918         r->l0 = cpu_to_be64(
 919                 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 920                  ((xfs_bmbt_rec_base_t)startoff << 9) |
 921                  ((xfs_bmbt_rec_base_t)startblock >> 43));
 922         r->l1 = cpu_to_be64(
 923                 ((xfs_bmbt_rec_base_t)startblock << 21) |
 924                  ((xfs_bmbt_rec_base_t)blockcount &
 925                   (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
 926 #else   /* !XFS_BIG_BLKNOS */
 927         if (ISNULLSTARTBLOCK(startblock)) {
 928                 r->l0 = cpu_to_be64(
 929                         ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 930                          ((xfs_bmbt_rec_base_t)startoff << 9) |
 931                           (xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
 932                 r->l1 = cpu_to_be64(XFS_MASK64HI(11) |
 933                           ((xfs_bmbt_rec_base_t)startblock << 21) |
 934                           ((xfs_bmbt_rec_base_t)blockcount &
 935                            (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
 936         } else {
 937                 r->l0 = cpu_to_be64(
 938                         ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 939                          ((xfs_bmbt_rec_base_t)startoff << 9));
 940                 r->l1 = cpu_to_be64(
 941                         ((xfs_bmbt_rec_base_t)startblock << 21) |
 942                          ((xfs_bmbt_rec_base_t)blockcount &
 943                           (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
 944         }
 945 #endif  /* XFS_BIG_BLKNOS */
 946 }
 947
 948 /*
 949  * Set all the fields in a bmap extent record from the uncompressed form.
 950  */
 951 void
 952 xfs_bmbt_disk_set_all(
 953         xfs_bmbt_rec_t  *r,
 954         xfs_bmbt_irec_t *s)
 955 {
 956         xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
 957                                   s->br_blockcount, s->br_state);
 958 }
 959
 960 /*
 961  * Set the blockcount field in a bmap extent record.
 962  */
 963 void
 964 xfs_bmbt_set_blockcount(
 965         xfs_bmbt_rec_host_t *r,
 966         xfs_filblks_t   v)
 967 {
 968         ASSERT((v & XFS_MASK64HI(43)) == 0);
 969         r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(43)) |
 970                   (xfs_bmbt_rec_base_t)(v & XFS_MASK64LO(21));
 971 }
 972
 973 /*
 974  * Set the startblock field in a bmap extent record.
 975  */
 976 void
 977 xfs_bmbt_set_startblock(
 978         xfs_bmbt_rec_host_t *r,
 979         xfs_fsblock_t   v)
 980 {
 981 #if XFS_BIG_BLKNOS
 982         ASSERT((v & XFS_MASK64HI(12)) == 0);
 983         r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(55)) |
 984                   (xfs_bmbt_rec_base_t)(v >> 43);
 985         r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)) |
 986                   (xfs_bmbt_rec_base_t)(v << 21);
 987 #else   /* !XFS_BIG_BLKNOS */
 988         if (ISNULLSTARTBLOCK(v)) {
 989                 r->l0 |= (xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
 990                 r->l1 = (xfs_bmbt_rec_base_t)XFS_MASK64HI(11) |
 991                           ((xfs_bmbt_rec_base_t)v << 21) |
 992                           (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
 993         } else {
 994                 r->l0 &= ~(xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
 995                 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
 996                           (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
 997         }
 998 #endif  /* XFS_BIG_BLKNOS */
 999 }
1000
1001 /*
1002  * Set the startoff field in a bmap extent record.
1003  */
1004 void
1005 xfs_bmbt_set_startoff(
1006         xfs_bmbt_rec_host_t *r,
1007         xfs_fileoff_t   v)
1008 {
1009         ASSERT((v & XFS_MASK64HI(9)) == 0);
1010         r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) XFS_MASK64HI(1)) |
1011                 ((xfs_bmbt_rec_base_t)v << 9) |
1012                   (r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
1013 }
1014
1015 /*
1016  * Set the extent state field in a bmap extent record.
1017  */
1018 void
1019 xfs_bmbt_set_state(
1020         xfs_bmbt_rec_host_t *r,
1021         xfs_exntst_t    v)
1022 {
1023         ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
1024         if (v == XFS_EXT_NORM)
1025                 r->l0 &= XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN);
1026         else
1027                 r->l0 |= XFS_MASK64HI(BMBT_EXNTFLAG_BITLEN);
1028 }
1029
1030 /*
1031  * Convert in-memory form of btree root to on-disk form.
1032  */
1033 void
1034 xfs_bmbt_to_bmdr(
1035         xfs_bmbt_block_t        *rblock,
1036         int                     rblocklen,
1037         xfs_bmdr_block_t        *dblock,
1038         int                     dblocklen)
1039 {
1040         int                     dmxr;
1041         xfs_bmbt_key_t          *fkp;
1042         __be64                  *fpp;
1043         xfs_bmbt_key_t          *tkp;
1044         __be64                  *tpp;
1045
1046         ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
1047         ASSERT(be64_to_cpu(rblock->bb_leftsib) == NULLDFSBNO);
1048         ASSERT(be64_to_cpu(rblock->bb_rightsib) == NULLDFSBNO);
1049         ASSERT(be16_to_cpu(rblock->bb_level) > 0);
1050         dblock->bb_level = rblock->bb_level;
1051         dblock->bb_numrecs = rblock->bb_numrecs;
1052         dmxr = (int)XFS_BTREE_BLOCK_MAXRECS(dblocklen, xfs_bmdr, 0);
1053         fkp = XFS_BMAP_BROOT_KEY_ADDR(rblock, 1, rblocklen);
1054         tkp = XFS_BTREE_KEY_ADDR(xfs_bmdr, dblock, 1);
1055         fpp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, rblocklen);
1056         tpp = XFS_BTREE_PTR_ADDR(xfs_bmdr, dblock, 1, dmxr);
1057         dmxr = be16_to_cpu(dblock->bb_numrecs);
1058         memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
1059         memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
1060 }
1061
1062 /*
1063  * Check extent records, which have just been read, for
1064  * any bit in the extent flag field. ASSERT on debug
1065  * kernels, as this condition should not occur.
1066  * Return an error condition (1) if any flags found,
1067  * otherwise return 0.
1068  */
1069
1070 int
1071 xfs_check_nostate_extents(
1072         xfs_ifork_t             *ifp,
1073         xfs_extnum_t            idx,
1074         xfs_extnum_t            num)
1075 {
1076         for (; num > 0; num--, idx++) {
1077                 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
1078                 if ((ep->l0 >>
1079                      (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
1080                         ASSERT(0);
1081                         return 1;
1082                 }
1083         }
1084         return 0;
1085 }
1086
1087
1088 STATIC struct xfs_btree_cur *
1089 xfs_bmbt_dup_cursor(
1090         struct xfs_btree_cur    *cur)
1091 {
1092         struct xfs_btree_cur    *new;
1093
1094         new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
1095                         cur->bc_private.b.ip, cur->bc_private.b.whichfork);
1096
1097         /*
1098          * Copy the firstblock, flist, and flags values,
1099          * since init cursor doesn't get them.
1100          */
1101         new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
1102         new->bc_private.b.flist = cur->bc_private.b.flist;
1103         new->bc_private.b.flags = cur->bc_private.b.flags;
1104
1105         return new;
1106 }
1107
1108 STATIC void
1109 xfs_bmbt_update_cursor(
1110         struct xfs_btree_cur    *src,
1111         struct xfs_btree_cur    *dst)
1112 {
1113         ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
1114                (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
1115         ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
1116
1117         dst->bc_private.b.allocated += src->bc_private.b.allocated;
1118         dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
1119
1120         src->bc_private.b.allocated = 0;
1121 }
1122
1123 STATIC int
1124 xfs_bmbt_alloc_block(
1125         struct xfs_btree_cur    *cur,
1126         union xfs_btree_ptr     *start,
1127         union xfs_btree_ptr     *new,
1128         int                     length,
1129         int                     *stat)
1130 {
1131         xfs_alloc_arg_t         args;           /* block allocation args */
1132         int                     error;          /* error return value */
1133
1134         memset(&args, 0, sizeof(args));
1135         args.tp = cur->bc_tp;
1136         args.mp = cur->bc_mp;
1137         args.fsbno = cur->bc_private.b.firstblock;
1138         args.firstblock = args.fsbno;
1139
1140         if (args.fsbno == NULLFSBLOCK) {
1141                 args.fsbno = be64_to_cpu(start->l);
1142                 args.type = XFS_ALLOCTYPE_START_BNO;
1143                 /*
1144                  * Make sure there is sufficient room left in the AG to
1145                  * complete a full tree split for an extent insert.  If
1146                  * we are converting the middle part of an extent then
1147                  * we may need space for two tree splits.
1148                  *
1149                  * We are relying on the caller to make the correct block
1150                  * reservation for this operation to succeed.  If the
1151                  * reservation amount is insufficient then we may fail a
1152                  * block allocation here and corrupt the filesystem.
1153                  */
1154                 args.minleft = xfs_trans_get_block_res(args.tp);
1155         } else if (cur->bc_private.b.flist->xbf_low) {
1156                 args.type = XFS_ALLOCTYPE_START_BNO;
1157         } else {
1158                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
1159         }
1160
1161         args.minlen = args.maxlen = args.prod = 1;
1162         args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
1163         if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
1164                 error = XFS_ERROR(ENOSPC);
1165                 goto error0;
1166         }
1167         error = xfs_alloc_vextent(&args);
1168         if (error)
1169                 goto error0;
1170
1171         if (args.fsbno == NULLFSBLOCK && args.minleft) {
1172                 /*
1173                  * Could not find an AG with enough free space to satisfy
1174                  * a full btree split.  Try again without minleft and if
1175                  * successful activate the lowspace algorithm.
1176                  */
1177                 args.fsbno = 0;
1178                 args.type = XFS_ALLOCTYPE_FIRST_AG;
1179                 args.minleft = 0;
1180                 error = xfs_alloc_vextent(&args);
1181                 if (error)
1182                         goto error0;
1183                 cur->bc_private.b.flist->xbf_low = 1;
1184         }
1185         if (args.fsbno == NULLFSBLOCK) {
1186                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
1187                 *stat = 0;
1188                 return 0;
1189         }
1190         ASSERT(args.len == 1);
1191         cur->bc_private.b.firstblock = args.fsbno;
1192         cur->bc_private.b.allocated++;
1193         cur->bc_private.b.ip->i_d.di_nblocks++;
1194         xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
1195         XFS_TRANS_MOD_DQUOT_BYINO(args.mp, args.tp, cur->bc_private.b.ip,
1196                         XFS_TRANS_DQ_BCOUNT, 1L);
1197
1198         new->l = cpu_to_be64(args.fsbno);
1199
1200         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
1201         *stat = 1;
1202         return 0;
1203
1204  error0:
1205         XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
1206         return error;
1207 }
1208
1209 STATIC int
1210 xfs_bmbt_free_block(
1211         struct xfs_btree_cur    *cur,
1212         struct xfs_buf          *bp)
1213 {
1214         struct xfs_mount        *mp = cur->bc_mp;
1215         struct xfs_inode        *ip = cur->bc_private.b.ip;
1216         struct xfs_trans        *tp = cur->bc_tp;
1217         xfs_fsblock_t           fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
1218
1219         xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
1220         ip->i_d.di_nblocks--;
1221
1222         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
1223         XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
1224         xfs_trans_binval(tp, bp);
1225         return 0;
1226 }
1227
1228 STATIC int
1229 xfs_bmbt_get_maxrecs(
1230         struct xfs_btree_cur    *cur,
1231         int                     level)
1232 {
1233         return XFS_BMAP_BLOCK_IMAXRECS(level, cur);
1234 }
1235
1236 /*
1237  * Get the maximum records we could store in the on-disk format.
1238  *
1239  * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
1240  * for the root node this checks the available space in the dinode fork
1241  * so that we can resize the in-memory buffer to match it.  After a
1242  * resize to the maximum size this function returns the same value
1243  * as xfs_bmbt_get_maxrecs for the root node, too.
1244  */
1245 STATIC int
1246 xfs_bmbt_get_dmaxrecs(
1247         struct xfs_btree_cur    *cur,
1248         int                     level)
1249 {
1250         return XFS_BMAP_BLOCK_DMAXRECS(level, cur);
1251 }
1252
1253 STATIC void
1254 xfs_bmbt_init_key_from_rec(
1255         union xfs_btree_key     *key,
1256         union xfs_btree_rec     *rec)
1257 {
1258         key->bmbt.br_startoff =
1259                 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
1260 }
1261
1262 STATIC void
1263 xfs_bmbt_init_rec_from_key(
1264         union xfs_btree_key     *key,
1265         union xfs_btree_rec     *rec)
1266 {
1267         ASSERT(key->bmbt.br_startoff != 0);
1268
1269         xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
1270                                0, 0, XFS_EXT_NORM);
1271 }
1272
1273 STATIC void
1274 xfs_bmbt_init_rec_from_cur(
1275         struct xfs_btree_cur    *cur,
1276         union xfs_btree_rec     *rec)
1277 {
1278         xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
1279 }
1280
1281 STATIC void
1282 xfs_bmbt_init_ptr_from_cur(
1283         struct xfs_btree_cur    *cur,
1284         union xfs_btree_ptr     *ptr)
1285 {
1286         ptr->l = 0;
1287 }
1288
1289 STATIC __int64_t
1290 xfs_bmbt_key_diff(
1291         struct xfs_btree_cur    *cur,
1292         union xfs_btree_key     *key)
1293 {
1294         return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
1295                                       cur->bc_rec.b.br_startoff;
1296 }
1297
1298 #ifdef XFS_BTREE_TRACE
1299 ktrace_t        *xfs_bmbt_trace_buf;
1300
1301 STATIC void
1302 xfs_bmbt_trace_enter(
1303         struct xfs_btree_cur    *cur,
1304         const char              *func,
1305         char                    *s,
1306         int                     type,
1307         int                     line,
1308         __psunsigned_t          a0,
1309         __psunsigned_t          a1,
1310         __psunsigned_t          a2,
1311         __psunsigned_t          a3,
1312         __psunsigned_t          a4,
1313         __psunsigned_t          a5,
1314         __psunsigned_t          a6,
1315         __psunsigned_t          a7,
1316         __psunsigned_t          a8,
1317         __psunsigned_t          a9,
1318         __psunsigned_t          a10)
1319 {
1320         struct xfs_inode        *ip = cur->bc_private.b.ip;
1321         int                     whichfork = cur->bc_private.b.whichfork;
1322
1323         ktrace_enter(xfs_bmbt_trace_buf,
1324                 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
1325                 (void *)func, (void *)s, (void *)ip, (void *)cur,
1326                 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
1327                 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
1328                 (void *)a8, (void *)a9, (void *)a10);
1329         ktrace_enter(ip->i_btrace,
1330                 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
1331                 (void *)func, (void *)s, (void *)ip, (void *)cur,
1332                 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
1333                 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
1334                 (void *)a8, (void *)a9, (void *)a10);
1335 }
1336
1337 STATIC void
1338 xfs_bmbt_trace_cursor(
1339         struct xfs_btree_cur    *cur,
1340         __uint32_t              *s0,
1341         __uint64_t              *l0,
1342         __uint64_t              *l1)
1343 {
1344         struct xfs_bmbt_rec_host r;
1345
1346         xfs_bmbt_set_all(&r, &cur->bc_rec.b);
1347
1348         *s0 = (cur->bc_nlevels << 24) |
1349               (cur->bc_private.b.flags << 16) |
1350                cur->bc_private.b.allocated;
1351         *l0 = r.l0;
1352         *l1 = r.l1;
1353 }
1354
1355 STATIC void
1356 xfs_bmbt_trace_key(
1357         struct xfs_btree_cur    *cur,
1358         union xfs_btree_key     *key,
1359         __uint64_t              *l0,
1360         __uint64_t              *l1)
1361 {
1362         *l0 = be64_to_cpu(key->bmbt.br_startoff);
1363         *l1 = 0;
1364 }
1365
1366 STATIC void
1367 xfs_bmbt_trace_record(
1368         struct xfs_btree_cur    *cur,
1369         union xfs_btree_rec     *rec,
1370         __uint64_t              *l0,
1371         __uint64_t              *l1,
1372         __uint64_t              *l2)
1373 {
1374         struct xfs_bmbt_irec    irec;
1375
1376         xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
1377         *l0 = irec.br_startoff;
1378         *l1 = irec.br_startblock;
1379         *l2 = irec.br_blockcount;
1380 }
1381 #endif /* XFS_BTREE_TRACE */
1382
1383 static const struct xfs_btree_ops xfs_bmbt_ops = {
1384         .rec_len                = sizeof(xfs_bmbt_rec_t),
1385         .key_len                = sizeof(xfs_bmbt_key_t),
1386
1387         .dup_cursor             = xfs_bmbt_dup_cursor,
1388         .update_cursor          = xfs_bmbt_update_cursor,
1389         .alloc_block            = xfs_bmbt_alloc_block,
1390         .free_block             = xfs_bmbt_free_block,
1391         .get_maxrecs            = xfs_bmbt_get_maxrecs,
1392         .get_dmaxrecs           = xfs_bmbt_get_dmaxrecs,
1393         .init_key_from_rec      = xfs_bmbt_init_key_from_rec,
1394         .init_rec_from_key      = xfs_bmbt_init_rec_from_key,
1395         .init_rec_from_cur      = xfs_bmbt_init_rec_from_cur,
1396         .init_ptr_from_cur      = xfs_bmbt_init_ptr_from_cur,
1397         .key_diff               = xfs_bmbt_key_diff,
1398
1399 #ifdef XFS_BTREE_TRACE
1400         .trace_enter            = xfs_bmbt_trace_enter,
1401         .trace_cursor           = xfs_bmbt_trace_cursor,
1402         .trace_key              = xfs_bmbt_trace_key,
1403         .trace_record           = xfs_bmbt_trace_record,
1404 #endif
1405 };
1406
1407 /*
1408  * Allocate a new bmap btree cursor.
1409  */
1410 struct xfs_btree_cur *                          /* new bmap btree cursor */
1411 xfs_bmbt_init_cursor(
1412         struct xfs_mount        *mp,            /* file system mount point */
1413         struct xfs_trans        *tp,            /* transaction pointer */
1414         struct xfs_inode        *ip,            /* inode owning the btree */
1415         int                     whichfork)      /* data or attr fork */
1416 {
1417         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
1418         struct xfs_btree_cur    *cur;
1419
1420         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
1421
1422         cur->bc_tp = tp;
1423         cur->bc_mp = mp;
1424         cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
1425         cur->bc_btnum = XFS_BTNUM_BMAP;
1426         cur->bc_blocklog = mp->m_sb.sb_blocklog;
1427
1428         cur->bc_ops = &xfs_bmbt_ops;
1429         cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
1430
1431         cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
1432         cur->bc_private.b.ip = ip;
1433         cur->bc_private.b.firstblock = NULLFSBLOCK;
1434         cur->bc_private.b.flist = NULL;
1435         cur->bc_private.b.allocated = 0;
1436         cur->bc_private.b.flags = 0;
1437         cur->bc_private.b.whichfork = whichfork;
1438
1439         return cur;
1440 }