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_mount.h"
  28 #include "xfs_bmap_btree.h"
  29 #include "xfs_alloc_btree.h"
  30 #include "xfs_ialloc_btree.h"
  31 #include "xfs_dinode.h"
  32 #include "xfs_inode.h"
  33 #include "xfs_inode_item.h"
  34 #include "xfs_alloc.h"
  35 #include "xfs_btree.h"
  36 #include "xfs_btree_trace.h"
  37 #include "xfs_itable.h"
  38 #include "xfs_bmap.h"
  39 #include "xfs_error.h"
  40 #include "xfs_quota.h"
  41
  42 /*
  43  * Determine the extent state.
  44  */
  45 /* ARGSUSED */
  46 STATIC xfs_exntst_t
  47 xfs_extent_state(
  48         xfs_filblks_t           blks,
  49         int                     extent_flag)
  50 {
  51         if (extent_flag) {
  52                 ASSERT(blks != 0);      /* saved for DMIG */
  53                 return XFS_EXT_UNWRITTEN;
  54         }
  55         return XFS_EXT_NORM;
  56 }
  57
  58 /*
  59  * Convert on-disk form of btree root to in-memory form.
  60  */
  61 void
  62 xfs_bmdr_to_bmbt(
  63         struct xfs_mount        *mp,
  64         xfs_bmdr_block_t        *dblock,
  65         int                     dblocklen,
  66         struct xfs_btree_block  *rblock,
  67         int                     rblocklen)
  68 {
  69         int                     dmxr;
  70         xfs_bmbt_key_t          *fkp;
  71         __be64                  *fpp;
  72         xfs_bmbt_key_t          *tkp;
  73         __be64                  *tpp;
  74
  75         rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
  76         rblock->bb_level = dblock->bb_level;
  77         ASSERT(be16_to_cpu(rblock->bb_level) > 0);
  78         rblock->bb_numrecs = dblock->bb_numrecs;
  79         rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
  80         rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
  81         dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
  82         fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
  83         tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
  84         fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
  85         tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
  86         dmxr = be16_to_cpu(dblock->bb_numrecs);
  87         memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
  88         memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
  89 }
  90
  91 /*
  92  * Convert a compressed bmap extent record to an uncompressed form.
  93  * This code must be in sync with the routines xfs_bmbt_get_startoff,
  94  * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
  95  */
  96 STATIC void
  97 __xfs_bmbt_get_all(
  98                 __uint64_t l0,
  99                 __uint64_t l1,
 100                 xfs_bmbt_irec_t *s)
 101 {
 102         int     ext_flag;
 103         xfs_exntst_t st;
 104
 105         ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
 106         s->br_startoff = ((xfs_fileoff_t)l0 &
 107                            xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 108 #if XFS_BIG_BLKNOS
 109         s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
 110                            (((xfs_fsblock_t)l1) >> 21);
 111 #else
 112 #ifdef DEBUG
 113         {
 114                 xfs_dfsbno_t    b;
 115
 116                 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
 117                     (((xfs_dfsbno_t)l1) >> 21);
 118                 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
 119                 s->br_startblock = (xfs_fsblock_t)b;
 120         }
 121 #else   /* !DEBUG */
 122         s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
 123 #endif  /* DEBUG */
 124 #endif  /* XFS_BIG_BLKNOS */
 125         s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
 126         /* This is xfs_extent_state() in-line */
 127         if (ext_flag) {
 128                 ASSERT(s->br_blockcount != 0);  /* saved for DMIG */
 129                 st = XFS_EXT_UNWRITTEN;
 130         } else
 131                 st = XFS_EXT_NORM;
 132         s->br_state = st;
 133 }
 134
 135 void
 136 xfs_bmbt_get_all(
 137         xfs_bmbt_rec_host_t *r,
 138         xfs_bmbt_irec_t *s)
 139 {
 140         __xfs_bmbt_get_all(r->l0, r->l1, s);
 141 }
 142
 143 /*
 144  * Extract the blockcount field from an in memory bmap extent record.
 145  */
 146 xfs_filblks_t
 147 xfs_bmbt_get_blockcount(
 148         xfs_bmbt_rec_host_t     *r)
 149 {
 150         return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
 151 }
 152
 153 /*
 154  * Extract the startblock field from an in memory bmap extent record.
 155  */
 156 xfs_fsblock_t
 157 xfs_bmbt_get_startblock(
 158         xfs_bmbt_rec_host_t     *r)
 159 {
 160 #if XFS_BIG_BLKNOS
 161         return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
 162                (((xfs_fsblock_t)r->l1) >> 21);
 163 #else
 164 #ifdef DEBUG
 165         xfs_dfsbno_t    b;
 166
 167         b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
 168             (((xfs_dfsbno_t)r->l1) >> 21);
 169         ASSERT((b >> 32) == 0 || isnulldstartblock(b));
 170         return (xfs_fsblock_t)b;
 171 #else   /* !DEBUG */
 172         return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
 173 #endif  /* DEBUG */
 174 #endif  /* XFS_BIG_BLKNOS */
 175 }
 176
 177 /*
 178  * Extract the startoff field from an in memory bmap extent record.
 179  */
 180 xfs_fileoff_t
 181 xfs_bmbt_get_startoff(
 182         xfs_bmbt_rec_host_t     *r)
 183 {
 184         return ((xfs_fileoff_t)r->l0 &
 185                  xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 186 }
 187
 188 xfs_exntst_t
 189 xfs_bmbt_get_state(
 190         xfs_bmbt_rec_host_t     *r)
 191 {
 192         int     ext_flag;
 193
 194         ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
 195         return xfs_extent_state(xfs_bmbt_get_blockcount(r),
 196                                 ext_flag);
 197 }
 198
 199 /*
 200  * Extract the blockcount field from an on disk bmap extent record.
 201  */
 202 xfs_filblks_t
 203 xfs_bmbt_disk_get_blockcount(
 204         xfs_bmbt_rec_t  *r)
 205 {
 206         return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
 207 }
 208
 209 /*
 210  * Extract the startoff field from a disk format bmap extent record.
 211  */
 212 xfs_fileoff_t
 213 xfs_bmbt_disk_get_startoff(
 214         xfs_bmbt_rec_t  *r)
 215 {
 216         return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
 217                  xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
 218 }
 219
 220
 221 /*
 222  * Set all the fields in a bmap extent record from the arguments.
 223  */
 224 void
 225 xfs_bmbt_set_allf(
 226         xfs_bmbt_rec_host_t     *r,
 227         xfs_fileoff_t           startoff,
 228         xfs_fsblock_t           startblock,
 229         xfs_filblks_t           blockcount,
 230         xfs_exntst_t            state)
 231 {
 232         int             extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
 233
 234         ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
 235         ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
 236         ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
 237
 238 #if XFS_BIG_BLKNOS
 239         ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
 240
 241         r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 242                 ((xfs_bmbt_rec_base_t)startoff << 9) |
 243                 ((xfs_bmbt_rec_base_t)startblock >> 43);
 244         r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
 245                 ((xfs_bmbt_rec_base_t)blockcount &
 246                 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
 247 #else   /* !XFS_BIG_BLKNOS */
 248         if (isnullstartblock(startblock)) {
 249                 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 250                         ((xfs_bmbt_rec_base_t)startoff << 9) |
 251                          (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
 252                 r->l1 = xfs_mask64hi(11) |
 253                           ((xfs_bmbt_rec_base_t)startblock << 21) |
 254                           ((xfs_bmbt_rec_base_t)blockcount &
 255                            (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
 256         } else {
 257                 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 258                         ((xfs_bmbt_rec_base_t)startoff << 9);
 259                 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
 260                          ((xfs_bmbt_rec_base_t)blockcount &
 261                          (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
 262         }
 263 #endif  /* XFS_BIG_BLKNOS */
 264 }
 265
 266 /*
 267  * Set all the fields in a bmap extent record from the uncompressed form.
 268  */
 269 void
 270 xfs_bmbt_set_all(
 271         xfs_bmbt_rec_host_t *r,
 272         xfs_bmbt_irec_t *s)
 273 {
 274         xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
 275                              s->br_blockcount, s->br_state);
 276 }
 277
 278
 279 /*
 280  * Set all the fields in a disk format bmap extent record from the arguments.
 281  */
 282 void
 283 xfs_bmbt_disk_set_allf(
 284         xfs_bmbt_rec_t          *r,
 285         xfs_fileoff_t           startoff,
 286         xfs_fsblock_t           startblock,
 287         xfs_filblks_t           blockcount,
 288         xfs_exntst_t            state)
 289 {
 290         int                     extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
 291
 292         ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
 293         ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
 294         ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
 295
 296 #if XFS_BIG_BLKNOS
 297         ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
 298
 299         r->l0 = cpu_to_be64(
 300                 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 301                  ((xfs_bmbt_rec_base_t)startoff << 9) |
 302                  ((xfs_bmbt_rec_base_t)startblock >> 43));
 303         r->l1 = cpu_to_be64(
 304                 ((xfs_bmbt_rec_base_t)startblock << 21) |
 305                  ((xfs_bmbt_rec_base_t)blockcount &
 306                   (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
 307 #else   /* !XFS_BIG_BLKNOS */
 308         if (isnullstartblock(startblock)) {
 309                 r->l0 = cpu_to_be64(
 310                         ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 311                          ((xfs_bmbt_rec_base_t)startoff << 9) |
 312                           (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
 313                 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
 314                           ((xfs_bmbt_rec_base_t)startblock << 21) |
 315                           ((xfs_bmbt_rec_base_t)blockcount &
 316                            (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
 317         } else {
 318                 r->l0 = cpu_to_be64(
 319                         ((xfs_bmbt_rec_base_t)extent_flag << 63) |
 320                          ((xfs_bmbt_rec_base_t)startoff << 9));
 321                 r->l1 = cpu_to_be64(
 322                         ((xfs_bmbt_rec_base_t)startblock << 21) |
 323                          ((xfs_bmbt_rec_base_t)blockcount &
 324                           (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
 325         }
 326 #endif  /* XFS_BIG_BLKNOS */
 327 }
 328
 329 /*
 330  * Set all the fields in a bmap extent record from the uncompressed form.
 331  */
 332 STATIC void
 333 xfs_bmbt_disk_set_all(
 334         xfs_bmbt_rec_t  *r,
 335         xfs_bmbt_irec_t *s)
 336 {
 337         xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
 338                                   s->br_blockcount, s->br_state);
 339 }
 340
 341 /*
 342  * Set the blockcount field in a bmap extent record.
 343  */
 344 void
 345 xfs_bmbt_set_blockcount(
 346         xfs_bmbt_rec_host_t *r,
 347         xfs_filblks_t   v)
 348 {
 349         ASSERT((v & xfs_mask64hi(43)) == 0);
 350         r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
 351                   (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
 352 }
 353
 354 /*
 355  * Set the startblock field in a bmap extent record.
 356  */
 357 void
 358 xfs_bmbt_set_startblock(
 359         xfs_bmbt_rec_host_t *r,
 360         xfs_fsblock_t   v)
 361 {
 362 #if XFS_BIG_BLKNOS
 363         ASSERT((v & xfs_mask64hi(12)) == 0);
 364         r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
 365                   (xfs_bmbt_rec_base_t)(v >> 43);
 366         r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
 367                   (xfs_bmbt_rec_base_t)(v << 21);
 368 #else   /* !XFS_BIG_BLKNOS */
 369         if (isnullstartblock(v)) {
 370                 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
 371                 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
 372                           ((xfs_bmbt_rec_base_t)v << 21) |
 373                           (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
 374         } else {
 375                 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
 376                 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
 377                           (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
 378         }
 379 #endif  /* XFS_BIG_BLKNOS */
 380 }
 381
 382 /*
 383  * Set the startoff field in a bmap extent record.
 384  */
 385 void
 386 xfs_bmbt_set_startoff(
 387         xfs_bmbt_rec_host_t *r,
 388         xfs_fileoff_t   v)
 389 {
 390         ASSERT((v & xfs_mask64hi(9)) == 0);
 391         r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
 392                 ((xfs_bmbt_rec_base_t)v << 9) |
 393                   (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
 394 }
 395
 396 /*
 397  * Set the extent state field in a bmap extent record.
 398  */
 399 void
 400 xfs_bmbt_set_state(
 401         xfs_bmbt_rec_host_t *r,
 402         xfs_exntst_t    v)
 403 {
 404         ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
 405         if (v == XFS_EXT_NORM)
 406                 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
 407         else
 408                 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
 409 }
 410
 411 /*
 412  * Convert in-memory form of btree root to on-disk form.
 413  */
 414 void
 415 xfs_bmbt_to_bmdr(
 416         struct xfs_mount        *mp,
 417         struct xfs_btree_block  *rblock,
 418         int                     rblocklen,
 419         xfs_bmdr_block_t        *dblock,
 420         int                     dblocklen)
 421 {
 422         int                     dmxr;
 423         xfs_bmbt_key_t          *fkp;
 424         __be64                  *fpp;
 425         xfs_bmbt_key_t          *tkp;
 426         __be64                  *tpp;
 427
 428         ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
 429         ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO);
 430         ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO);
 431         ASSERT(be16_to_cpu(rblock->bb_level) > 0);
 432         dblock->bb_level = rblock->bb_level;
 433         dblock->bb_numrecs = rblock->bb_numrecs;
 434         dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
 435         fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
 436         tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
 437         fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
 438         tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
 439         dmxr = be16_to_cpu(dblock->bb_numrecs);
 440         memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
 441         memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
 442 }
 443
 444 /*
 445  * Check extent records, which have just been read, for
 446  * any bit in the extent flag field. ASSERT on debug
 447  * kernels, as this condition should not occur.
 448  * Return an error condition (1) if any flags found,
 449  * otherwise return 0.
 450  */
 451
 452 int
 453 xfs_check_nostate_extents(
 454         xfs_ifork_t             *ifp,
 455         xfs_extnum_t            idx,
 456         xfs_extnum_t            num)
 457 {
 458         for (; num > 0; num--, idx++) {
 459                 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
 460                 if ((ep->l0 >>
 461                      (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
 462                         ASSERT(0);
 463                         return 1;
 464                 }
 465         }
 466         return 0;
 467 }
 468
 469
 470 STATIC struct xfs_btree_cur *
 471 xfs_bmbt_dup_cursor(
 472         struct xfs_btree_cur    *cur)
 473 {
 474         struct xfs_btree_cur    *new;
 475
 476         new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
 477                         cur->bc_private.b.ip, cur->bc_private.b.whichfork);
 478
 479         /*
 480          * Copy the firstblock, flist, and flags values,
 481          * since init cursor doesn't get them.
 482          */
 483         new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
 484         new->bc_private.b.flist = cur->bc_private.b.flist;
 485         new->bc_private.b.flags = cur->bc_private.b.flags;
 486
 487         return new;
 488 }
 489
 490 STATIC void
 491 xfs_bmbt_update_cursor(
 492         struct xfs_btree_cur    *src,
 493         struct xfs_btree_cur    *dst)
 494 {
 495         ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
 496                (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
 497         ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
 498
 499         dst->bc_private.b.allocated += src->bc_private.b.allocated;
 500         dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
 501
 502         src->bc_private.b.allocated = 0;
 503 }
 504
 505 STATIC int
 506 xfs_bmbt_alloc_block(
 507         struct xfs_btree_cur    *cur,
 508         union xfs_btree_ptr     *start,
 509         union xfs_btree_ptr     *new,
 510         int                     length,
 511         int                     *stat)
 512 {
 513         xfs_alloc_arg_t         args;           /* block allocation args */
 514         int                     error;          /* error return value */
 515
 516         memset(&args, 0, sizeof(args));
 517         args.tp = cur->bc_tp;
 518         args.mp = cur->bc_mp;
 519         args.fsbno = cur->bc_private.b.firstblock;
 520         args.firstblock = args.fsbno;
 521
 522         if (args.fsbno == NULLFSBLOCK) {
 523                 args.fsbno = be64_to_cpu(start->l);
 524                 args.type = XFS_ALLOCTYPE_START_BNO;
 525                 /*
 526                  * Make sure there is sufficient room left in the AG to
 527                  * complete a full tree split for an extent insert.  If
 528                  * we are converting the middle part of an extent then
 529                  * we may need space for two tree splits.
 530                  *
 531                  * We are relying on the caller to make the correct block
 532                  * reservation for this operation to succeed.  If the
 533                  * reservation amount is insufficient then we may fail a
 534                  * block allocation here and corrupt the filesystem.
 535                  */
 536                 args.minleft = xfs_trans_get_block_res(args.tp);
 537         } else if (cur->bc_private.b.flist->xbf_low) {
 538                 args.type = XFS_ALLOCTYPE_START_BNO;
 539         } else {
 540                 args.type = XFS_ALLOCTYPE_NEAR_BNO;
 541         }
 542
 543         args.minlen = args.maxlen = args.prod = 1;
 544         args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
 545         if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
 546                 error = XFS_ERROR(ENOSPC);
 547                 goto error0;
 548         }
 549         error = xfs_alloc_vextent(&args);
 550         if (error)
 551                 goto error0;
 552
 553         if (args.fsbno == NULLFSBLOCK && args.minleft) {
 554                 /*
 555                  * Could not find an AG with enough free space to satisfy
 556                  * a full btree split.  Try again without minleft and if
 557                  * successful activate the lowspace algorithm.
 558                  */
 559                 args.fsbno = 0;
 560                 args.type = XFS_ALLOCTYPE_FIRST_AG;
 561                 args.minleft = 0;
 562                 error = xfs_alloc_vextent(&args);
 563                 if (error)
 564                         goto error0;
 565                 cur->bc_private.b.flist->xbf_low = 1;
 566         }
 567         if (args.fsbno == NULLFSBLOCK) {
 568                 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 569                 *stat = 0;
 570                 return 0;
 571         }
 572         ASSERT(args.len == 1);
 573         cur->bc_private.b.firstblock = args.fsbno;
 574         cur->bc_private.b.allocated++;
 575         cur->bc_private.b.ip->i_d.di_nblocks++;
 576         xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
 577         xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
 578                         XFS_TRANS_DQ_BCOUNT, 1L);
 579
 580         new->l = cpu_to_be64(args.fsbno);
 581
 582         XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
 583         *stat = 1;
 584         return 0;
 585
 586  error0:
 587         XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
 588         return error;
 589 }
 590
 591 STATIC int
 592 xfs_bmbt_free_block(
 593         struct xfs_btree_cur    *cur,
 594         struct xfs_buf          *bp)
 595 {
 596         struct xfs_mount        *mp = cur->bc_mp;
 597         struct xfs_inode        *ip = cur->bc_private.b.ip;
 598         struct xfs_trans        *tp = cur->bc_tp;
 599         xfs_fsblock_t           fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
 600
 601         xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
 602         ip->i_d.di_nblocks--;
 603
 604         xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
 605         xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
 606         xfs_trans_binval(tp, bp);
 607         return 0;
 608 }
 609
 610 STATIC int
 611 xfs_bmbt_get_minrecs(
 612         struct xfs_btree_cur    *cur,
 613         int                     level)
 614 {
 615         if (level == cur->bc_nlevels - 1) {
 616                 struct xfs_ifork        *ifp;
 617
 618                 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
 619                                     cur->bc_private.b.whichfork);
 620
 621                 return xfs_bmbt_maxrecs(cur->bc_mp,
 622                                         ifp->if_broot_bytes, level == 0) / 2;
 623         }
 624
 625         return cur->bc_mp->m_bmap_dmnr[level != 0];
 626 }
 627
 628 int
 629 xfs_bmbt_get_maxrecs(
 630         struct xfs_btree_cur    *cur,
 631         int                     level)
 632 {
 633         if (level == cur->bc_nlevels - 1) {
 634                 struct xfs_ifork        *ifp;
 635
 636                 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
 637                                     cur->bc_private.b.whichfork);
 638
 639                 return xfs_bmbt_maxrecs(cur->bc_mp,
 640                                         ifp->if_broot_bytes, level == 0);
 641         }
 642
 643         return cur->bc_mp->m_bmap_dmxr[level != 0];
 644
 645 }
 646
 647 /*
 648  * Get the maximum records we could store in the on-disk format.
 649  *
 650  * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
 651  * for the root node this checks the available space in the dinode fork
 652  * so that we can resize the in-memory buffer to match it.  After a
 653  * resize to the maximum size this function returns the same value
 654  * as xfs_bmbt_get_maxrecs for the root node, too.
 655  */
 656 STATIC int
 657 xfs_bmbt_get_dmaxrecs(
 658         struct xfs_btree_cur    *cur,
 659         int                     level)
 660 {
 661         if (level != cur->bc_nlevels - 1)
 662                 return cur->bc_mp->m_bmap_dmxr[level != 0];
 663         return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
 664                                 level == 0);
 665 }
 666
 667 STATIC void
 668 xfs_bmbt_init_key_from_rec(
 669         union xfs_btree_key     *key,
 670         union xfs_btree_rec     *rec)
 671 {
 672         key->bmbt.br_startoff =
 673                 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
 674 }
 675
 676 STATIC void
 677 xfs_bmbt_init_rec_from_key(
 678         union xfs_btree_key     *key,
 679         union xfs_btree_rec     *rec)
 680 {
 681         ASSERT(key->bmbt.br_startoff != 0);
 682
 683         xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
 684                                0, 0, XFS_EXT_NORM);
 685 }
 686
 687 STATIC void
 688 xfs_bmbt_init_rec_from_cur(
 689         struct xfs_btree_cur    *cur,
 690         union xfs_btree_rec     *rec)
 691 {
 692         xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
 693 }
 694
 695 STATIC void
 696 xfs_bmbt_init_ptr_from_cur(
 697         struct xfs_btree_cur    *cur,
 698         union xfs_btree_ptr     *ptr)
 699 {
 700         ptr->l = 0;
 701 }
 702
 703 STATIC __int64_t
 704 xfs_bmbt_key_diff(
 705         struct xfs_btree_cur    *cur,
 706         union xfs_btree_key     *key)
 707 {
 708         return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
 709                                       cur->bc_rec.b.br_startoff;
 710 }
 711
 712 #ifdef DEBUG
 713 STATIC int
 714 xfs_bmbt_keys_inorder(
 715         struct xfs_btree_cur    *cur,
 716         union xfs_btree_key     *k1,
 717         union xfs_btree_key     *k2)
 718 {
 719         return be64_to_cpu(k1->bmbt.br_startoff) <
 720                 be64_to_cpu(k2->bmbt.br_startoff);
 721 }
 722
 723 STATIC int
 724 xfs_bmbt_recs_inorder(
 725         struct xfs_btree_cur    *cur,
 726         union xfs_btree_rec     *r1,
 727         union xfs_btree_rec     *r2)
 728 {
 729         return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
 730                 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
 731                 xfs_bmbt_disk_get_startoff(&r2->bmbt);
 732 }
 733 #endif  /* DEBUG */
 734
 735 #ifdef XFS_BTREE_TRACE
 736 ktrace_t        *xfs_bmbt_trace_buf;
 737
 738 STATIC void
 739 xfs_bmbt_trace_enter(
 740         struct xfs_btree_cur    *cur,
 741         const char              *func,
 742         char                    *s,
 743         int                     type,
 744         int                     line,
 745         __psunsigned_t          a0,
 746         __psunsigned_t          a1,
 747         __psunsigned_t          a2,
 748         __psunsigned_t          a3,
 749         __psunsigned_t          a4,
 750         __psunsigned_t          a5,
 751         __psunsigned_t          a6,
 752         __psunsigned_t          a7,
 753         __psunsigned_t          a8,
 754         __psunsigned_t          a9,
 755         __psunsigned_t          a10)
 756 {
 757         struct xfs_inode        *ip = cur->bc_private.b.ip;
 758         int                     whichfork = cur->bc_private.b.whichfork;
 759
 760         ktrace_enter(xfs_bmbt_trace_buf,
 761                 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
 762                 (void *)func, (void *)s, (void *)ip, (void *)cur,
 763                 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
 764                 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
 765                 (void *)a8, (void *)a9, (void *)a10);
 766 }
 767
 768 STATIC void
 769 xfs_bmbt_trace_cursor(
 770         struct xfs_btree_cur    *cur,
 771         __uint32_t              *s0,
 772         __uint64_t              *l0,
 773         __uint64_t              *l1)
 774 {
 775         struct xfs_bmbt_rec_host r;
 776
 777         xfs_bmbt_set_all(&r, &cur->bc_rec.b);
 778
 779         *s0 = (cur->bc_nlevels << 24) |
 780               (cur->bc_private.b.flags << 16) |
 781                cur->bc_private.b.allocated;
 782         *l0 = r.l0;
 783         *l1 = r.l1;
 784 }
 785
 786 STATIC void
 787 xfs_bmbt_trace_key(
 788         struct xfs_btree_cur    *cur,
 789         union xfs_btree_key     *key,
 790         __uint64_t              *l0,
 791         __uint64_t              *l1)
 792 {
 793         *l0 = be64_to_cpu(key->bmbt.br_startoff);
 794         *l1 = 0;
 795 }
 796
 797 /* Endian flipping versions of the bmbt extraction functions */
 798 STATIC void
 799 xfs_bmbt_disk_get_all(
 800         xfs_bmbt_rec_t  *r,
 801         xfs_bmbt_irec_t *s)
 802 {
 803         __xfs_bmbt_get_all(get_unaligned_be64(&r->l0),
 804                                 get_unaligned_be64(&r->l1), s);
 805 }
 806
 807 STATIC void
 808 xfs_bmbt_trace_record(
 809         struct xfs_btree_cur    *cur,
 810         union xfs_btree_rec     *rec,
 811         __uint64_t              *l0,
 812         __uint64_t              *l1,
 813         __uint64_t              *l2)
 814 {
 815         struct xfs_bmbt_irec    irec;
 816
 817         xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
 818         *l0 = irec.br_startoff;
 819         *l1 = irec.br_startblock;
 820         *l2 = irec.br_blockcount;
 821 }
 822 #endif /* XFS_BTREE_TRACE */
 823
 824 static const struct xfs_btree_ops xfs_bmbt_ops = {
 825         .rec_len                = sizeof(xfs_bmbt_rec_t),
 826         .key_len                = sizeof(xfs_bmbt_key_t),
 827
 828         .dup_cursor             = xfs_bmbt_dup_cursor,
 829         .update_cursor          = xfs_bmbt_update_cursor,
 830         .alloc_block            = xfs_bmbt_alloc_block,
 831         .free_block             = xfs_bmbt_free_block,
 832         .get_maxrecs            = xfs_bmbt_get_maxrecs,
 833         .get_minrecs            = xfs_bmbt_get_minrecs,
 834         .get_dmaxrecs           = xfs_bmbt_get_dmaxrecs,
 835         .init_key_from_rec      = xfs_bmbt_init_key_from_rec,
 836         .init_rec_from_key      = xfs_bmbt_init_rec_from_key,
 837         .init_rec_from_cur      = xfs_bmbt_init_rec_from_cur,
 838         .init_ptr_from_cur      = xfs_bmbt_init_ptr_from_cur,
 839         .key_diff               = xfs_bmbt_key_diff,
 840
 841 #ifdef DEBUG
 842         .keys_inorder           = xfs_bmbt_keys_inorder,
 843         .recs_inorder           = xfs_bmbt_recs_inorder,
 844 #endif
 845
 846 #ifdef XFS_BTREE_TRACE
 847         .trace_enter            = xfs_bmbt_trace_enter,
 848         .trace_cursor           = xfs_bmbt_trace_cursor,
 849         .trace_key              = xfs_bmbt_trace_key,
 850         .trace_record           = xfs_bmbt_trace_record,
 851 #endif
 852 };
 853
 854 /*
 855  * Allocate a new bmap btree cursor.
 856  */
 857 struct xfs_btree_cur *                          /* new bmap btree cursor */
 858 xfs_bmbt_init_cursor(
 859         struct xfs_mount        *mp,            /* file system mount point */
 860         struct xfs_trans        *tp,            /* transaction pointer */
 861         struct xfs_inode        *ip,            /* inode owning the btree */
 862         int                     whichfork)      /* data or attr fork */
 863 {
 864         struct xfs_ifork        *ifp = XFS_IFORK_PTR(ip, whichfork);
 865         struct xfs_btree_cur    *cur;
 866
 867         cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
 868
 869         cur->bc_tp = tp;
 870         cur->bc_mp = mp;
 871         cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
 872         cur->bc_btnum = XFS_BTNUM_BMAP;
 873         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 874
 875         cur->bc_ops = &xfs_bmbt_ops;
 876         cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
 877
 878         cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
 879         cur->bc_private.b.ip = ip;
 880         cur->bc_private.b.firstblock = NULLFSBLOCK;
 881         cur->bc_private.b.flist = NULL;
 882         cur->bc_private.b.allocated = 0;
 883         cur->bc_private.b.flags = 0;
 884         cur->bc_private.b.whichfork = whichfork;
 885
 886         return cur;
 887 }
 888
 889 /*
 890  * Calculate number of records in a bmap btree block.
 891  */
 892 int
 893 xfs_bmbt_maxrecs(
 894         struct xfs_mount        *mp,
 895         int                     blocklen,
 896         int                     leaf)
 897 {
 898         blocklen -= XFS_BMBT_BLOCK_LEN(mp);
 899
 900         if (leaf)
 901                 return blocklen / sizeof(xfs_bmbt_rec_t);
 902         return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
 903 }
 904
 905 /*
 906  * Calculate number of records in a bmap btree inode root.
 907  */
 908 int
 909 xfs_bmdr_maxrecs(
 910         struct xfs_mount        *mp,
 911         int                     blocklen,
 912         int                     leaf)
 913 {
 914         blocklen -= sizeof(xfs_bmdr_block_t);
 915
 916         if (leaf)
 917                 return blocklen / sizeof(xfs_bmdr_rec_t);
 918         return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
 919 }