fs/xfs/xfs_itable.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_shared.h"
  21 #include "xfs_format.h"
  22 #include "xfs_log_format.h"
  23 #include "xfs_trans_resv.h"
  24 #include "xfs_inum.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_mount.h"
  28 #include "xfs_inode.h"
  29 #include "xfs_btree.h"
  30 #include "xfs_ialloc.h"
  31 #include "xfs_ialloc_btree.h"
  32 #include "xfs_itable.h"
  33 #include "xfs_error.h"
  34 #include "xfs_trace.h"
  35 #include "xfs_icache.h"
  36 #include "xfs_dinode.h"
  37
  38 STATIC int
  39 xfs_internal_inum(
  40         xfs_mount_t     *mp,
  41         xfs_ino_t       ino)
  42 {
  43         return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
  44                 (xfs_sb_version_hasquota(&mp->m_sb) &&
  45                  xfs_is_quota_inode(&mp->m_sb, ino)));
  46 }
  47
  48 /*
  49  * Return stat information for one inode.
  50  * Return 0 if ok, else errno.
  51  */
  52 int
  53 xfs_bulkstat_one_int(
  54         struct xfs_mount        *mp,            /* mount point for filesystem */
  55         xfs_ino_t               ino,            /* inode to get data for */
  56         void __user             *buffer,        /* buffer to place output in */
  57         int                     ubsize,         /* size of buffer */
  58         bulkstat_one_fmt_pf     formatter,      /* formatter, copy to user */
  59         int                     *ubused,        /* bytes used by me */
  60         int                     *stat)          /* BULKSTAT_RV_... */
  61 {
  62         struct xfs_icdinode     *dic;           /* dinode core info pointer */
  63         struct xfs_inode        *ip;            /* incore inode pointer */
  64         struct xfs_bstat        *buf;           /* return buffer */
  65         int                     error = 0;      /* error value */
  66
  67         *stat = BULKSTAT_RV_NOTHING;
  68
  69         if (!buffer || xfs_internal_inum(mp, ino))
  70                 return -EINVAL;
  71
  72         buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
  73         if (!buf)
  74                 return -ENOMEM;
  75
  76         error = xfs_iget(mp, NULL, ino,
  77                          (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
  78                          XFS_ILOCK_SHARED, &ip);
  79         if (error)
  80                 goto out_free;
  81
  82         ASSERT(ip != NULL);
  83         ASSERT(ip->i_imap.im_blkno != 0);
  84
  85         dic = &ip->i_d;
  86
  87         /* xfs_iget returns the following without needing
  88          * further change.
  89          */
  90         buf->bs_nlink = dic->di_nlink;
  91         buf->bs_projid_lo = dic->di_projid_lo;
  92         buf->bs_projid_hi = dic->di_projid_hi;
  93         buf->bs_ino = ino;
  94         buf->bs_mode = dic->di_mode;
  95         buf->bs_uid = dic->di_uid;
  96         buf->bs_gid = dic->di_gid;
  97         buf->bs_size = dic->di_size;
  98         buf->bs_atime.tv_sec = dic->di_atime.t_sec;
  99         buf->bs_atime.tv_nsec = dic->di_atime.t_nsec;
 100         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
 101         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
 102         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
 103         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
 104         buf->bs_xflags = xfs_ip2xflags(ip);
 105         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
 106         buf->bs_extents = dic->di_nextents;
 107         buf->bs_gen = dic->di_gen;
 108         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 109         buf->bs_dmevmask = dic->di_dmevmask;
 110         buf->bs_dmstate = dic->di_dmstate;
 111         buf->bs_aextents = dic->di_anextents;
 112         buf->bs_forkoff = XFS_IFORK_BOFF(ip);
 113
 114         switch (dic->di_format) {
 115         case XFS_DINODE_FMT_DEV:
 116                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 117                 buf->bs_blksize = BLKDEV_IOSIZE;
 118                 buf->bs_blocks = 0;
 119                 break;
 120         case XFS_DINODE_FMT_LOCAL:
 121         case XFS_DINODE_FMT_UUID:
 122                 buf->bs_rdev = 0;
 123                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 124                 buf->bs_blocks = 0;
 125                 break;
 126         case XFS_DINODE_FMT_EXTENTS:
 127         case XFS_DINODE_FMT_BTREE:
 128                 buf->bs_rdev = 0;
 129                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 130                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 131                 break;
 132         }
 133         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 134         IRELE(ip);
 135
 136         error = formatter(buffer, ubsize, ubused, buf);
 137         if (!error)
 138                 *stat = BULKSTAT_RV_DIDONE;
 139
 140  out_free:
 141         kmem_free(buf);
 142         return error;
 143 }
 144
 145 /* Return 0 on success or positive error */
 146 STATIC int
 147 xfs_bulkstat_one_fmt(
 148         void                    __user *ubuffer,
 149         int                     ubsize,
 150         int                     *ubused,
 151         const xfs_bstat_t       *buffer)
 152 {
 153         if (ubsize < sizeof(*buffer))
 154                 return -ENOMEM;
 155         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 156                 return -EFAULT;
 157         if (ubused)
 158                 *ubused = sizeof(*buffer);
 159         return 0;
 160 }
 161
 162 int
 163 xfs_bulkstat_one(
 164         xfs_mount_t     *mp,            /* mount point for filesystem */
 165         xfs_ino_t       ino,            /* inode number to get data for */
 166         void            __user *buffer, /* buffer to place output in */
 167         int             ubsize,         /* size of buffer */
 168         int             *ubused,        /* bytes used by me */
 169         int             *stat)          /* BULKSTAT_RV_... */
 170 {
 171         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 172                                     xfs_bulkstat_one_fmt, ubused, stat);
 173 }
 174
 175 /*
 176  * Loop over all clusters in a chunk for a given incore inode allocation btree
 177  * record.  Do a readahead if there are any allocated inodes in that cluster.
 178  */
 179 STATIC void
 180 xfs_bulkstat_ichunk_ra(
 181         struct xfs_mount                *mp,
 182         xfs_agnumber_t                  agno,
 183         struct xfs_inobt_rec_incore     *irec)
 184 {
 185         xfs_agblock_t                   agbno;
 186         struct blk_plug                 plug;
 187         int                             blks_per_cluster;
 188         int                             inodes_per_cluster;
 189         int                             i;      /* inode chunk index */
 190
 191         agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino);
 192         blks_per_cluster = xfs_icluster_size_fsb(mp);
 193         inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
 194
 195         blk_start_plug(&plug);
 196         for (i = 0; i < XFS_INODES_PER_CHUNK;
 197              i += inodes_per_cluster, agbno += blks_per_cluster) {
 198                 if (xfs_inobt_maskn(i, inodes_per_cluster) & ~irec->ir_free) {
 199                         xfs_btree_reada_bufs(mp, agno, agbno, blks_per_cluster,
 200                                              &xfs_inode_buf_ops);
 201                 }
 202         }
 203         blk_finish_plug(&plug);
 204 }
 205
 206 /*
 207  * Lookup the inode chunk that the given inode lives in and then get the record
 208  * if we found the chunk.  If the inode was not the last in the chunk and there
 209  * are some left allocated, update the data for the pointed-to record as well as
 210  * return the count of grabbed inodes.
 211  */
 212 STATIC int
 213 xfs_bulkstat_grab_ichunk(
 214         struct xfs_btree_cur            *cur,   /* btree cursor */
 215         xfs_agino_t                     agino,  /* starting inode of chunk */
 216         int                             *icount,/* return # of inodes grabbed */
 217         struct xfs_inobt_rec_incore     *irec)  /* btree record */
 218 {
 219         int                             idx;    /* index into inode chunk */
 220         int                             stat;
 221         int                             error = 0;
 222
 223         /* Lookup the inode chunk that this inode lives in */
 224         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &stat);
 225         if (error)
 226                 return error;
 227         if (!stat) {
 228                 *icount = 0;
 229                 return error;
 230         }
 231
 232         /* Get the record, should always work */
 233         error = xfs_inobt_get_rec(cur, irec, &stat);
 234         if (error)
 235                 return error;
 236         XFS_WANT_CORRUPTED_RETURN(stat == 1);
 237
 238         /* Check if the record contains the inode in request */
 239         if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino)
 240                 return -EINVAL;
 241
 242         idx = agino - irec->ir_startino + 1;
 243         if (idx < XFS_INODES_PER_CHUNK &&
 244             (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK - idx) & ~irec->ir_free)) {
 245                 int     i;
 246
 247                 /* We got a right chunk with some left inodes allocated at it.
 248                  * Grab the chunk record.  Mark all the uninteresting inodes
 249                  * free -- because they're before our start point.
 250                  */
 251                 for (i = 0; i < idx; i++) {
 252                         if (XFS_INOBT_MASK(i) & ~irec->ir_free)
 253                                 irec->ir_freecount++;
 254                 }
 255
 256                 irec->ir_free |= xfs_inobt_maskn(0, idx);
 257                 *icount = XFS_INODES_PER_CHUNK - irec->ir_freecount;
 258         }
 259
 260         return 0;
 261 }
 262
 263 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 264
 265 /*
 266  * Process inodes in chunk with a pointer to a formatter function
 267  * that will iget the inode and fill in the appropriate structure.
 268  */
 269 int
 270 xfs_bulkstat_ag_ichunk(
 271         struct xfs_mount                *mp,
 272         xfs_agnumber_t                  agno,
 273         struct xfs_inobt_rec_incore     *irbp,
 274         bulkstat_one_pf                 formatter,
 275         size_t                          statstruct_size,
 276         struct xfs_bulkstat_agichunk    *acp)
 277 {
 278         xfs_ino_t                       lastino = acp->ac_lastino;
 279         char                            __user **ubufp = acp->ac_ubuffer;
 280         int                             ubleft = acp->ac_ubleft;
 281         int                             ubelem = acp->ac_ubelem;
 282         int                             chunkidx, clustidx;
 283         int                             error = 0;
 284         xfs_agino_t                     agino;
 285
 286         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 287              XFS_BULKSTAT_UBLEFT(ubleft) &&
 288              irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 289              chunkidx++, clustidx++, agino++) {
 290                 int             fmterror;       /* bulkstat formatter result */
 291                 int             ubused;
 292                 xfs_ino_t       ino = XFS_AGINO_TO_INO(mp, agno, agino);
 293
 294                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 295
 296                 /* Skip if this inode is free */
 297                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 298                         lastino = ino;
 299                         continue;
 300                 }
 301
 302                 /*
 303                  * Count used inodes as free so we can tell when the
 304                  * chunk is used up.
 305                  */
 306                 irbp->ir_freecount++;
 307
 308                 /* Get the inode and fill in a single buffer */
 309                 ubused = statstruct_size;
 310                 error = formatter(mp, ino, *ubufp, ubleft, &ubused, &fmterror);
 311                 if (fmterror == BULKSTAT_RV_NOTHING) {
 312                         if (error && error != -ENOENT && error != -EINVAL) {
 313                                 ubleft = 0;
 314                                 break;
 315                         }
 316                         lastino = ino;
 317                         continue;
 318                 }
 319                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 320                         ubleft = 0;
 321                         ASSERT(error);
 322                         break;
 323                 }
 324                 if (*ubufp)
 325                         *ubufp += ubused;
 326                 ubleft -= ubused;
 327                 ubelem++;
 328                 lastino = ino;
 329         }
 330
 331         acp->ac_lastino = lastino;
 332         acp->ac_ubleft = ubleft;
 333         acp->ac_ubelem = ubelem;
 334
 335         return error;
 336 }
 337
 338 /*
 339  * Return stat information in bulk (by-inode) for the filesystem.
 340  */
 341 int                                     /* error status */
 342 xfs_bulkstat(
 343         xfs_mount_t             *mp,    /* mount point for filesystem */
 344         xfs_ino_t               *lastinop, /* last inode returned */
 345         int                     *ubcountp, /* size of buffer/count returned */
 346         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 347         size_t                  statstruct_size, /* sizeof struct filling */
 348         char                    __user *ubuffer, /* buffer with inode stats */
 349         int                     *done)  /* 1 if there are more stats to get */
 350 {
 351         xfs_buf_t               *agbp;  /* agi header buffer */
 352         xfs_agi_t               *agi;   /* agi header data */
 353         xfs_agino_t             agino;  /* inode # in allocation group */
 354         xfs_agnumber_t          agno;   /* allocation group number */
 355         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 356         int                     end_of_ag; /* set if we've seen the ag end */
 357         int                     error;  /* error code */
 358         int                     fmterror;/* bulkstat formatter result */
 359         int                     i;      /* loop index */
 360         int                     icount; /* count of inodes good in irbuf */
 361         size_t                  irbsize; /* size of irec buffer in bytes */
 362         xfs_ino_t               ino;    /* inode number (filesystem) */
 363         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 364         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 365         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 366         xfs_ino_t               lastino; /* last inode number returned */
 367         int                     nirbuf; /* size of irbuf */
 368         int                     rval;   /* return value error code */
 369         int                     tmp;    /* result value from btree calls */
 370         int                     ubcount; /* size of user's buffer */
 371         int                     ubleft; /* bytes left in user's buffer */
 372         char                    __user *ubufp;  /* pointer into user's buffer */
 373         int                     ubelem; /* spaces used in user's buffer */
 374
 375         /*
 376          * Get the last inode value, see if there's nothing to do.
 377          */
 378         ino = (xfs_ino_t)*lastinop;
 379         lastino = ino;
 380         agno = XFS_INO_TO_AGNO(mp, ino);
 381         agino = XFS_INO_TO_AGINO(mp, ino);
 382         if (agno >= mp->m_sb.sb_agcount ||
 383             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 384                 *done = 1;
 385                 *ubcountp = 0;
 386                 return 0;
 387         }
 388
 389         ubcount = *ubcountp; /* statstruct's */
 390         ubleft = ubcount * statstruct_size; /* bytes */
 391         *ubcountp = ubelem = 0;
 392         *done = 0;
 393         fmterror = 0;
 394         ubufp = ubuffer;
 395         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
 396         if (!irbuf)
 397                 return -ENOMEM;
 398
 399         nirbuf = irbsize / sizeof(*irbuf);
 400
 401         /*
 402          * Loop over the allocation groups, starting from the last
 403          * inode returned; 0 means start of the allocation group.
 404          */
 405         rval = 0;
 406         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 407                 cond_resched();
 408                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 409                 if (error)
 410                         break;
 411                 agi = XFS_BUF_TO_AGI(agbp);
 412                 /*
 413                  * Allocate and initialize a btree cursor for ialloc btree.
 414                  */
 415                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
 416                                             XFS_BTNUM_INO);
 417                 irbp = irbuf;
 418                 irbufend = irbuf + nirbuf;
 419                 end_of_ag = 0;
 420                 icount = 0;
 421                 if (agino > 0) {
 422                         /*
 423                          * In the middle of an allocation group, we need to get
 424                          * the remainder of the chunk we're in.
 425                          */
 426                         struct xfs_inobt_rec_incore     r;
 427
 428                         error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
 429                         if (error)
 430                                 break;
 431                         if (icount) {
 432                                 irbp->ir_startino = r.ir_startino;
 433                                 irbp->ir_freecount = r.ir_freecount;
 434                                 irbp->ir_free = r.ir_free;
 435                                 irbp++;
 436                                 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 437                         }
 438                         /* Increment to the next record */
 439                         error = xfs_btree_increment(cur, 0, &tmp);
 440                 } else {
 441                         /* Start of ag.  Lookup the first inode chunk */
 442                         error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
 443                 }
 444                 if (error)
 445                         break;
 446
 447                 /*
 448                  * Loop through inode btree records in this ag,
 449                  * until we run out of inodes or space in the buffer.
 450                  */
 451                 while (irbp < irbufend && icount < ubcount) {
 452                         struct xfs_inobt_rec_incore     r;
 453
 454                         error = xfs_inobt_get_rec(cur, &r, &i);
 455                         if (error || i == 0) {
 456                                 end_of_ag = 1;
 457                                 break;
 458                         }
 459
 460                         /*
 461                          * If this chunk has any allocated inodes, save it.
 462                          * Also start read-ahead now for this chunk.
 463                          */
 464                         if (r.ir_freecount < XFS_INODES_PER_CHUNK) {
 465                                 xfs_bulkstat_ichunk_ra(mp, agno, &r);
 466                                 irbp->ir_startino = r.ir_startino;
 467                                 irbp->ir_freecount = r.ir_freecount;
 468                                 irbp->ir_free = r.ir_free;
 469                                 irbp++;
 470                                 icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
 471                         }
 472                         /*
 473                          * Set agino to after this chunk and bump the cursor.
 474                          */
 475                         agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 476                         error = xfs_btree_increment(cur, 0, &tmp);
 477                         cond_resched();
 478                 }
 479                 /*
 480                  * Drop the btree buffers and the agi buffer.
 481                  * We can't hold any of the locks these represent
 482                  * when calling iget.
 483                  */
 484                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 485                 xfs_buf_relse(agbp);
 486                 /*
 487                  * Now format all the good inodes into the user's buffer.
 488                  */
 489                 irbufend = irbp;
 490                 for (irbp = irbuf;
 491                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 492                         struct xfs_bulkstat_agichunk ac;
 493
 494                         ac.ac_lastino = lastino;
 495                         ac.ac_ubuffer = &ubuffer;
 496                         ac.ac_ubleft = ubleft;
 497                         ac.ac_ubelem = ubelem;
 498                         error = xfs_bulkstat_ag_ichunk(mp, agno, irbp,
 499                                         formatter, statstruct_size, &ac);
 500                         if (error)
 501                                 rval = error;
 502
 503                         lastino = ac.ac_lastino;
 504                         ubleft = ac.ac_ubleft;
 505                         ubelem = ac.ac_ubelem;
 506
 507                         cond_resched();
 508                 }
 509                 /*
 510                  * Set up for the next loop iteration.
 511                  */
 512                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 513                         if (end_of_ag) {
 514                                 agno++;
 515                                 agino = 0;
 516                         } else
 517                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 518                 } else
 519                         break;
 520         }
 521         /*
 522          * Done, we're either out of filesystem or space to put the data.
 523          */
 524         kmem_free(irbuf);
 525         *ubcountp = ubelem;
 526         /*
 527          * Found some inodes, return them now and return the error next time.
 528          */
 529         if (ubelem)
 530                 rval = 0;
 531         if (agno >= mp->m_sb.sb_agcount) {
 532                 /*
 533                  * If we ran out of filesystem, mark lastino as off
 534                  * the end of the filesystem, so the next call
 535                  * will return immediately.
 536                  */
 537                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 538                 *done = 1;
 539         } else
 540                 *lastinop = (xfs_ino_t)lastino;
 541
 542         return rval;
 543 }
 544
 545 int
 546 xfs_inumbers_fmt(
 547         void                    __user *ubuffer, /* buffer to write to */
 548         const struct xfs_inogrp *buffer,        /* buffer to read from */
 549         long                    count,          /* # of elements to read */
 550         long                    *written)       /* # of bytes written */
 551 {
 552         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 553                 return -EFAULT;
 554         *written = count * sizeof(*buffer);
 555         return 0;
 556 }
 557
 558 /*
 559  * Return inode number table for the filesystem.
 560  */
 561 int                                     /* error status */
 562 xfs_inumbers(
 563         struct xfs_mount        *mp,/* mount point for filesystem */
 564         xfs_ino_t               *lastino,/* last inode returned */
 565         int                     *count,/* size of buffer/count returned */
 566         void                    __user *ubuffer,/* buffer with inode descriptions */
 567         inumbers_fmt_pf         formatter)
 568 {
 569         xfs_agnumber_t          agno = XFS_INO_TO_AGNO(mp, *lastino);
 570         xfs_agino_t             agino = XFS_INO_TO_AGINO(mp, *lastino);
 571         struct xfs_btree_cur    *cur = NULL;
 572         struct xfs_buf          *agbp = NULL;
 573         struct xfs_inogrp       *buffer;
 574         int                     bcount;
 575         int                     left = *count;
 576         int                     bufidx = 0;
 577         int                     error = 0;
 578
 579         *count = 0;
 580         if (agno >= mp->m_sb.sb_agcount ||
 581             *lastino != XFS_AGINO_TO_INO(mp, agno, agino))
 582                 return error;
 583
 584         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 585         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 586         do {
 587                 struct xfs_inobt_rec_incore     r;
 588                 int                             stat;
 589
 590                 if (!agbp) {
 591                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 592                         if (error)
 593                                 break;
 594
 595                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
 596                                                     XFS_BTNUM_INO);
 597                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
 598                                                  &stat);
 599                         if (error)
 600                                 break;
 601                         if (!stat)
 602                                 goto next_ag;
 603                 }
 604
 605                 error = xfs_inobt_get_rec(cur, &r, &stat);
 606                 if (error)
 607                         break;
 608                 if (!stat)
 609                         goto next_ag;
 610
 611                 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
 612                 buffer[bufidx].xi_startino =
 613                         XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
 614                 buffer[bufidx].xi_alloccount =
 615                         XFS_INODES_PER_CHUNK - r.ir_freecount;
 616                 buffer[bufidx].xi_allocmask = ~r.ir_free;
 617                 if (++bufidx == bcount) {
 618                         long    written;
 619
 620                         error = formatter(ubuffer, buffer, bufidx, &written);
 621                         if (error)
 622                                 break;
 623                         ubuffer += written;
 624                         *count += bufidx;
 625                         bufidx = 0;
 626                 }
 627                 if (!--left)
 628                         break;
 629
 630                 error = xfs_btree_increment(cur, 0, &stat);
 631                 if (error)
 632                         break;
 633                 if (stat)
 634                         continue;
 635
 636 next_ag:
 637                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 638                 cur = NULL;
 639                 xfs_buf_relse(agbp);
 640                 agbp = NULL;
 641                 agino = 0;
 642                 agno++;
 643         } while (agno < mp->m_sb.sb_agcount);
 644
 645         if (!error) {
 646                 if (bufidx) {
 647                         long    written;
 648
 649                         error = formatter(ubuffer, buffer, bufidx, &written);
 650                         if (!error)
 651                                 *count += bufidx;
 652                 }
 653                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 654         }
 655
 656         kmem_free(buffer);
 657         if (cur)
 658                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 659                                            XFS_BTREE_NOERROR));
 660         if (agbp)
 661                 xfs_buf_relse(agbp);
 662
 663         return error;
 664 }