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_types.h"
  21 #include "xfs_log.h"
  22 #include "xfs_inum.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_bmap_btree.h"
  28 #include "xfs_alloc_btree.h"
  29 #include "xfs_ialloc_btree.h"
  30 #include "xfs_dinode.h"
  31 #include "xfs_inode.h"
  32 #include "xfs_ialloc.h"
  33 #include "xfs_itable.h"
  34 #include "xfs_error.h"
  35 #include "xfs_btree.h"
  36 #include "xfs_trace.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                  (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
  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 XFS_ERROR(EINVAL);
  71
  72         buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
  73         if (!buf)
  74                 return XFS_ERROR(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                 *stat = BULKSTAT_RV_NOTHING;
  81                 goto out_free;
  82         }
  83
  84         ASSERT(ip != NULL);
  85         ASSERT(ip->i_imap.im_blkno != 0);
  86
  87         dic = &ip->i_d;
  88
  89         /* xfs_iget returns the following without needing
  90          * further change.
  91          */
  92         buf->bs_nlink = dic->di_nlink;
  93         buf->bs_projid_lo = dic->di_projid_lo;
  94         buf->bs_projid_hi = dic->di_projid_hi;
  95         buf->bs_ino = ino;
  96         buf->bs_mode = dic->di_mode;
  97         buf->bs_uid = dic->di_uid;
  98         buf->bs_gid = dic->di_gid;
  99         buf->bs_size = dic->di_size;
 100         buf->bs_atime.tv_sec = dic->di_atime.t_sec;
 101         buf->bs_atime.tv_nsec = dic->di_atime.t_nsec;
 102         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
 103         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
 104         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
 105         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
 106         buf->bs_xflags = xfs_ip2xflags(ip);
 107         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
 108         buf->bs_extents = dic->di_nextents;
 109         buf->bs_gen = dic->di_gen;
 110         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 111         buf->bs_dmevmask = dic->di_dmevmask;
 112         buf->bs_dmstate = dic->di_dmstate;
 113         buf->bs_aextents = dic->di_anextents;
 114         buf->bs_forkoff = XFS_IFORK_BOFF(ip);
 115
 116         switch (dic->di_format) {
 117         case XFS_DINODE_FMT_DEV:
 118                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 119                 buf->bs_blksize = BLKDEV_IOSIZE;
 120                 buf->bs_blocks = 0;
 121                 break;
 122         case XFS_DINODE_FMT_LOCAL:
 123         case XFS_DINODE_FMT_UUID:
 124                 buf->bs_rdev = 0;
 125                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 126                 buf->bs_blocks = 0;
 127                 break;
 128         case XFS_DINODE_FMT_EXTENTS:
 129         case XFS_DINODE_FMT_BTREE:
 130                 buf->bs_rdev = 0;
 131                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 132                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 133                 break;
 134         }
 135         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 136         IRELE(ip);
 137
 138         error = formatter(buffer, ubsize, ubused, buf);
 139
 140         if (!error)
 141                 *stat = BULKSTAT_RV_DIDONE;
 142
 143  out_free:
 144         kmem_free(buf);
 145         return error;
 146 }
 147
 148 /* Return 0 on success or positive error */
 149 STATIC int
 150 xfs_bulkstat_one_fmt(
 151         void                    __user *ubuffer,
 152         int                     ubsize,
 153         int                     *ubused,
 154         const xfs_bstat_t       *buffer)
 155 {
 156         if (ubsize < sizeof(*buffer))
 157                 return XFS_ERROR(ENOMEM);
 158         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 159                 return XFS_ERROR(EFAULT);
 160         if (ubused)
 161                 *ubused = sizeof(*buffer);
 162         return 0;
 163 }
 164
 165 int
 166 xfs_bulkstat_one(
 167         xfs_mount_t     *mp,            /* mount point for filesystem */
 168         xfs_ino_t       ino,            /* inode number to get data for */
 169         void            __user *buffer, /* buffer to place output in */
 170         int             ubsize,         /* size of buffer */
 171         int             *ubused,        /* bytes used by me */
 172         int             *stat)          /* BULKSTAT_RV_... */
 173 {
 174         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 175                                     xfs_bulkstat_one_fmt, ubused, stat);
 176 }
 177
 178 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 179
 180 /*
 181  * Return stat information in bulk (by-inode) for the filesystem.
 182  */
 183 int                                     /* error status */
 184 xfs_bulkstat(
 185         xfs_mount_t             *mp,    /* mount point for filesystem */
 186         xfs_ino_t               *lastinop, /* last inode returned */
 187         int                     *ubcountp, /* size of buffer/count returned */
 188         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 189         size_t                  statstruct_size, /* sizeof struct filling */
 190         char                    __user *ubuffer, /* buffer with inode stats */
 191         int                     *done)  /* 1 if there are more stats to get */
 192 {
 193         xfs_agblock_t           agbno=0;/* allocation group block number */
 194         xfs_buf_t               *agbp;  /* agi header buffer */
 195         xfs_agi_t               *agi;   /* agi header data */
 196         xfs_agino_t             agino;  /* inode # in allocation group */
 197         xfs_agnumber_t          agno;   /* allocation group number */
 198         int                     chunkidx; /* current index into inode chunk */
 199         int                     clustidx; /* current index into inode cluster */
 200         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 201         int                     end_of_ag; /* set if we've seen the ag end */
 202         int                     error;  /* error code */
 203         int                     fmterror;/* bulkstat formatter result */
 204         int                     i;      /* loop index */
 205         int                     icount; /* count of inodes good in irbuf */
 206         size_t                  irbsize; /* size of irec buffer in bytes */
 207         xfs_ino_t               ino;    /* inode number (filesystem) */
 208         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 209         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 210         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 211         xfs_ino_t               lastino; /* last inode number returned */
 212         int                     nbcluster; /* # of blocks in a cluster */
 213         int                     nicluster; /* # of inodes in a cluster */
 214         int                     nimask; /* mask for inode clusters */
 215         int                     nirbuf; /* size of irbuf */
 216         int                     rval;   /* return value error code */
 217         int                     tmp;    /* result value from btree calls */
 218         int                     ubcount; /* size of user's buffer */
 219         int                     ubleft; /* bytes left in user's buffer */
 220         char                    __user *ubufp;  /* pointer into user's buffer */
 221         int                     ubelem; /* spaces used in user's buffer */
 222         int                     ubused; /* bytes used by formatter */
 223         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 224
 225         /*
 226          * Get the last inode value, see if there's nothing to do.
 227          */
 228         ino = (xfs_ino_t)*lastinop;
 229         lastino = ino;
 230         agno = XFS_INO_TO_AGNO(mp, ino);
 231         agino = XFS_INO_TO_AGINO(mp, ino);
 232         if (agno >= mp->m_sb.sb_agcount ||
 233             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 234                 *done = 1;
 235                 *ubcountp = 0;
 236                 return 0;
 237         }
 238         if (!ubcountp || *ubcountp <= 0) {
 239                 return EINVAL;
 240         }
 241         ubcount = *ubcountp; /* statstruct's */
 242         ubleft = ubcount * statstruct_size; /* bytes */
 243         *ubcountp = ubelem = 0;
 244         *done = 0;
 245         fmterror = 0;
 246         ubufp = ubuffer;
 247         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 248                 mp->m_sb.sb_inopblock :
 249                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 250         nimask = ~(nicluster - 1);
 251         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 252         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
 253         if (!irbuf)
 254                 return ENOMEM;
 255
 256         nirbuf = irbsize / sizeof(*irbuf);
 257
 258         /*
 259          * Loop over the allocation groups, starting from the last
 260          * inode returned; 0 means start of the allocation group.
 261          */
 262         rval = 0;
 263         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 264                 cond_resched();
 265                 bp = NULL;
 266                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 267                 if (error) {
 268                         /*
 269                          * Skip this allocation group and go to the next one.
 270                          */
 271                         agno++;
 272                         agino = 0;
 273                         continue;
 274                 }
 275                 agi = XFS_BUF_TO_AGI(agbp);
 276                 /*
 277                  * Allocate and initialize a btree cursor for ialloc btree.
 278                  */
 279                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 280                 irbp = irbuf;
 281                 irbufend = irbuf + nirbuf;
 282                 end_of_ag = 0;
 283                 /*
 284                  * If we're returning in the middle of an allocation group,
 285                  * we need to get the remainder of the chunk we're in.
 286                  */
 287                 if (agino > 0) {
 288                         xfs_inobt_rec_incore_t r;
 289
 290                         /*
 291                          * Lookup the inode chunk that this inode lives in.
 292                          */
 293                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE,
 294                                                  &tmp);
 295                         if (!error &&   /* no I/O error */
 296                             tmp &&      /* lookup succeeded */
 297                                         /* got the record, should always work */
 298                             !(error = xfs_inobt_get_rec(cur, &r, &i)) &&
 299                             i == 1 &&
 300                                         /* this is the right chunk */
 301                             agino < r.ir_startino + XFS_INODES_PER_CHUNK &&
 302                                         /* lastino was not last in chunk */
 303                             (chunkidx = agino - r.ir_startino + 1) <
 304                                     XFS_INODES_PER_CHUNK &&
 305                                         /* there are some left allocated */
 306                             xfs_inobt_maskn(chunkidx,
 307                                     XFS_INODES_PER_CHUNK - chunkidx) &
 308                                     ~r.ir_free) {
 309                                 /*
 310                                  * Grab the chunk record.  Mark all the
 311                                  * uninteresting inodes (because they're
 312                                  * before our start point) free.
 313                                  */
 314                                 for (i = 0; i < chunkidx; i++) {
 315                                         if (XFS_INOBT_MASK(i) & ~r.ir_free)
 316                                                 r.ir_freecount++;
 317                                 }
 318                                 r.ir_free |= xfs_inobt_maskn(0, chunkidx);
 319                                 irbp->ir_startino = r.ir_startino;
 320                                 irbp->ir_freecount = r.ir_freecount;
 321                                 irbp->ir_free = r.ir_free;
 322                                 irbp++;
 323                                 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 324                                 icount = XFS_INODES_PER_CHUNK - r.ir_freecount;
 325                         } else {
 326                                 /*
 327                                  * If any of those tests failed, bump the
 328                                  * inode number (just in case).
 329                                  */
 330                                 agino++;
 331                                 icount = 0;
 332                         }
 333                         /*
 334                          * In any case, increment to the next record.
 335                          */
 336                         if (!error)
 337                                 error = xfs_btree_increment(cur, 0, &tmp);
 338                 } else {
 339                         /*
 340                          * Start of ag.  Lookup the first inode chunk.
 341                          */
 342                         error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
 343                         icount = 0;
 344                 }
 345                 /*
 346                  * Loop through inode btree records in this ag,
 347                  * until we run out of inodes or space in the buffer.
 348                  */
 349                 while (irbp < irbufend && icount < ubcount) {
 350                         xfs_inobt_rec_incore_t r;
 351
 352                         /*
 353                          * Loop as long as we're unable to read the
 354                          * inode btree.
 355                          */
 356                         while (error) {
 357                                 agino += XFS_INODES_PER_CHUNK;
 358                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 359                                                 be32_to_cpu(agi->agi_length))
 360                                         break;
 361                                 error = xfs_inobt_lookup(cur, agino,
 362                                                          XFS_LOOKUP_GE, &tmp);
 363                                 cond_resched();
 364                         }
 365                         /*
 366                          * If ran off the end of the ag either with an error,
 367                          * or the normal way, set end and stop collecting.
 368                          */
 369                         if (error) {
 370                                 end_of_ag = 1;
 371                                 break;
 372                         }
 373
 374                         error = xfs_inobt_get_rec(cur, &r, &i);
 375                         if (error || i == 0) {
 376                                 end_of_ag = 1;
 377                                 break;
 378                         }
 379
 380                         /*
 381                          * If this chunk has any allocated inodes, save it.
 382                          * Also start read-ahead now for this chunk.
 383                          */
 384                         if (r.ir_freecount < XFS_INODES_PER_CHUNK) {
 385                                 /*
 386                                  * Loop over all clusters in the next chunk.
 387                                  * Do a readahead if there are any allocated
 388                                  * inodes in that cluster.
 389                                  */
 390                                 agbno = XFS_AGINO_TO_AGBNO(mp, r.ir_startino);
 391                                 for (chunkidx = 0;
 392                                      chunkidx < XFS_INODES_PER_CHUNK;
 393                                      chunkidx += nicluster,
 394                                      agbno += nbcluster) {
 395                                         if (xfs_inobt_maskn(chunkidx, nicluster)
 396                                                         & ~r.ir_free)
 397                                                 xfs_btree_reada_bufs(mp, agno,
 398                                                         agbno, nbcluster);
 399                                 }
 400                                 irbp->ir_startino = r.ir_startino;
 401                                 irbp->ir_freecount = r.ir_freecount;
 402                                 irbp->ir_free = r.ir_free;
 403                                 irbp++;
 404                                 icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
 405                         }
 406                         /*
 407                          * Set agino to after this chunk and bump the cursor.
 408                          */
 409                         agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 410                         error = xfs_btree_increment(cur, 0, &tmp);
 411                         cond_resched();
 412                 }
 413                 /*
 414                  * Drop the btree buffers and the agi buffer.
 415                  * We can't hold any of the locks these represent
 416                  * when calling iget.
 417                  */
 418                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 419                 xfs_buf_relse(agbp);
 420                 /*
 421                  * Now format all the good inodes into the user's buffer.
 422                  */
 423                 irbufend = irbp;
 424                 for (irbp = irbuf;
 425                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 426                         /*
 427                          * Now process this chunk of inodes.
 428                          */
 429                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 430                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 431                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 432                              chunkidx++, clustidx++, agino++) {
 433                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 434                                 /*
 435                                  * Recompute agbno if this is the
 436                                  * first inode of the cluster.
 437                                  *
 438                                  * Careful with clustidx.   There can be
 439                                  * multiple clusters per chunk, a single
 440                                  * cluster per chunk or a cluster that has
 441                                  * inodes represented from several different
 442                                  * chunks (if blocksize is large).
 443                                  *
 444                                  * Because of this, the starting clustidx is
 445                                  * initialized to zero in this loop but must
 446                                  * later be reset after reading in the cluster
 447                                  * buffer.
 448                                  */
 449                                 if ((chunkidx & (nicluster - 1)) == 0) {
 450                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 451                                                         irbp->ir_startino) +
 452                                                 ((chunkidx & nimask) >>
 453                                                  mp->m_sb.sb_inopblog);
 454                                 }
 455                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 456                                 /*
 457                                  * Skip if this inode is free.
 458                                  */
 459                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 460                                         lastino = ino;
 461                                         continue;
 462                                 }
 463                                 /*
 464                                  * Count used inodes as free so we can tell
 465                                  * when the chunk is used up.
 466                                  */
 467                                 irbp->ir_freecount++;
 468
 469                                 /*
 470                                  * Get the inode and fill in a single buffer.
 471                                  */
 472                                 ubused = statstruct_size;
 473                                 error = formatter(mp, ino, ubufp, ubleft,
 474                                                   &ubused, &fmterror);
 475                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 476                                         if (error && error != ENOENT &&
 477                                                 error != EINVAL) {
 478                                                 ubleft = 0;
 479                                                 rval = error;
 480                                                 break;
 481                                         }
 482                                         lastino = ino;
 483                                         continue;
 484                                 }
 485                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 486                                         ubleft = 0;
 487                                         ASSERT(error);
 488                                         rval = error;
 489                                         break;
 490                                 }
 491                                 if (ubufp)
 492                                         ubufp += ubused;
 493                                 ubleft -= ubused;
 494                                 ubelem++;
 495                                 lastino = ino;
 496                         }
 497
 498                         cond_resched();
 499                 }
 500
 501                 if (bp)
 502                         xfs_buf_relse(bp);
 503
 504                 /*
 505                  * Set up for the next loop iteration.
 506                  */
 507                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 508                         if (end_of_ag) {
 509                                 agno++;
 510                                 agino = 0;
 511                         } else
 512                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 513                 } else
 514                         break;
 515         }
 516         /*
 517          * Done, we're either out of filesystem or space to put the data.
 518          */
 519         kmem_free_large(irbuf);
 520         *ubcountp = ubelem;
 521         /*
 522          * Found some inodes, return them now and return the error next time.
 523          */
 524         if (ubelem)
 525                 rval = 0;
 526         if (agno >= mp->m_sb.sb_agcount) {
 527                 /*
 528                  * If we ran out of filesystem, mark lastino as off
 529                  * the end of the filesystem, so the next call
 530                  * will return immediately.
 531                  */
 532                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 533                 *done = 1;
 534         } else
 535                 *lastinop = (xfs_ino_t)lastino;
 536
 537         return rval;
 538 }
 539
 540 /*
 541  * Return stat information in bulk (by-inode) for the filesystem.
 542  * Special case for non-sequential one inode bulkstat.
 543  */
 544 int                                     /* error status */
 545 xfs_bulkstat_single(
 546         xfs_mount_t             *mp,    /* mount point for filesystem */
 547         xfs_ino_t               *lastinop, /* inode to return */
 548         char                    __user *buffer, /* buffer with inode stats */
 549         int                     *done)  /* 1 if there are more stats to get */
 550 {
 551         int                     count;  /* count value for bulkstat call */
 552         int                     error;  /* return value */
 553         xfs_ino_t               ino;    /* filesystem inode number */
 554         int                     res;    /* result from bs1 */
 555
 556         /*
 557          * note that requesting valid inode numbers which are not allocated
 558          * to inodes will most likely cause xfs_itobp to generate warning
 559          * messages about bad magic numbers. This is ok. The fact that
 560          * the inode isn't actually an inode is handled by the
 561          * error check below. Done this way to make the usual case faster
 562          * at the expense of the error case.
 563          */
 564
 565         ino = (xfs_ino_t)*lastinop;
 566         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t), 0, &res);
 567         if (error) {
 568                 /*
 569                  * Special case way failed, do it the "long" way
 570                  * to see if that works.
 571                  */
 572                 (*lastinop)--;
 573                 count = 1;
 574                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 575                                 sizeof(xfs_bstat_t), buffer, done))
 576                         return error;
 577                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 578                         return error == EFSCORRUPTED ?
 579                                 XFS_ERROR(EINVAL) : error;
 580                 else
 581                         return 0;
 582         }
 583         *done = 0;
 584         return 0;
 585 }
 586
 587 int
 588 xfs_inumbers_fmt(
 589         void                    __user *ubuffer, /* buffer to write to */
 590         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 591         long                    count,          /* # of elements to read */
 592         long                    *written)       /* # of bytes written */
 593 {
 594         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 595                 return -EFAULT;
 596         *written = count * sizeof(*buffer);
 597         return 0;
 598 }
 599
 600 /*
 601  * Return inode number table for the filesystem.
 602  */
 603 int                                     /* error status */
 604 xfs_inumbers(
 605         xfs_mount_t     *mp,            /* mount point for filesystem */
 606         xfs_ino_t       *lastino,       /* last inode returned */
 607         int             *count,         /* size of buffer/count returned */
 608         void            __user *ubuffer,/* buffer with inode descriptions */
 609         inumbers_fmt_pf formatter)
 610 {
 611         xfs_buf_t       *agbp;
 612         xfs_agino_t     agino;
 613         xfs_agnumber_t  agno;
 614         int             bcount;
 615         xfs_inogrp_t    *buffer;
 616         int             bufidx;
 617         xfs_btree_cur_t *cur;
 618         int             error;
 619         xfs_inobt_rec_incore_t r;
 620         int             i;
 621         xfs_ino_t       ino;
 622         int             left;
 623         int             tmp;
 624
 625         ino = (xfs_ino_t)*lastino;
 626         agno = XFS_INO_TO_AGNO(mp, ino);
 627         agino = XFS_INO_TO_AGINO(mp, ino);
 628         left = *count;
 629         *count = 0;
 630         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 631         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 632         error = bufidx = 0;
 633         cur = NULL;
 634         agbp = NULL;
 635         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 636                 if (agbp == NULL) {
 637                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 638                         if (error) {
 639                                 /*
 640                                  * If we can't read the AGI of this ag,
 641                                  * then just skip to the next one.
 642                                  */
 643                                 ASSERT(cur == NULL);
 644                                 agbp = NULL;
 645                                 agno++;
 646                                 agino = 0;
 647                                 continue;
 648                         }
 649                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 650                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
 651                                                  &tmp);
 652                         if (error) {
 653                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 654                                 cur = NULL;
 655                                 xfs_buf_relse(agbp);
 656                                 agbp = NULL;
 657                                 /*
 658                                  * Move up the last inode in the current
 659                                  * chunk.  The lookup_ge will always get
 660                                  * us the first inode in the next chunk.
 661                                  */
 662                                 agino += XFS_INODES_PER_CHUNK - 1;
 663                                 continue;
 664                         }
 665                 }
 666                 error = xfs_inobt_get_rec(cur, &r, &i);
 667                 if (error || i == 0) {
 668                         xfs_buf_relse(agbp);
 669                         agbp = NULL;
 670                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 671                         cur = NULL;
 672                         agno++;
 673                         agino = 0;
 674                         continue;
 675                 }
 676                 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
 677                 buffer[bufidx].xi_startino =
 678                         XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
 679                 buffer[bufidx].xi_alloccount =
 680                         XFS_INODES_PER_CHUNK - r.ir_freecount;
 681                 buffer[bufidx].xi_allocmask = ~r.ir_free;
 682                 bufidx++;
 683                 left--;
 684                 if (bufidx == bcount) {
 685                         long written;
 686                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 687                                 error = XFS_ERROR(EFAULT);
 688                                 break;
 689                         }
 690                         ubuffer += written;
 691                         *count += bufidx;
 692                         bufidx = 0;
 693                 }
 694                 if (left) {
 695                         error = xfs_btree_increment(cur, 0, &tmp);
 696                         if (error) {
 697                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 698                                 cur = NULL;
 699                                 xfs_buf_relse(agbp);
 700                                 agbp = NULL;
 701                                 /*
 702                                  * The agino value has already been bumped.
 703                                  * Just try to skip up to it.
 704                                  */
 705                                 agino += XFS_INODES_PER_CHUNK;
 706                                 continue;
 707                         }
 708                 }
 709         }
 710         if (!error) {
 711                 if (bufidx) {
 712                         long written;
 713                         if (formatter(ubuffer, buffer, bufidx, &written))
 714                                 error = XFS_ERROR(EFAULT);
 715                         else
 716                                 *count += bufidx;
 717                 }
 718                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 719         }
 720         kmem_free(buffer);
 721         if (cur)
 722                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 723                                            XFS_BTREE_NOERROR));
 724         if (agbp)
 725                 xfs_buf_relse(agbp);
 726         return error;
 727 }