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_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_error.h"
  40 #include "xfs_btree.h"
  41
  42 STATIC int
  43 xfs_internal_inum(
  44         xfs_mount_t     *mp,
  45         xfs_ino_t       ino)
  46 {
  47         return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
  48                 (xfs_sb_version_hasquota(&mp->m_sb) &&
  49                  (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
  50 }
  51
  52 /*
  53  * Return stat information for one inode.
  54  * Return 0 if ok, else errno.
  55  */
  56 int
  57 xfs_bulkstat_one_int(
  58         struct xfs_mount        *mp,            /* mount point for filesystem */
  59         xfs_ino_t               ino,            /* inode to get data for */
  60         void __user             *buffer,        /* buffer to place output in */
  61         int                     ubsize,         /* size of buffer */
  62         bulkstat_one_fmt_pf     formatter,      /* formatter, copy to user */
  63         int                     *ubused,        /* bytes used by me */
  64         int                     *stat)          /* BULKSTAT_RV_... */
  65 {
  66         struct xfs_icdinode     *dic;           /* dinode core info pointer */
  67         struct xfs_inode        *ip;            /* incore inode pointer */
  68         struct inode            *inode;
  69         struct xfs_bstat        *buf;           /* return buffer */
  70         int                     error = 0;      /* error value */
  71
  72         *stat = BULKSTAT_RV_NOTHING;
  73
  74         if (!buffer || xfs_internal_inum(mp, ino))
  75                 return XFS_ERROR(EINVAL);
  76
  77         buf = kmem_alloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
  78         if (!buf)
  79                 return XFS_ERROR(ENOMEM);
  80
  81         error = xfs_iget(mp, NULL, ino,
  82                          XFS_IGET_UNTRUSTED, XFS_ILOCK_SHARED, &ip);
  83         if (error) {
  84                 *stat = BULKSTAT_RV_NOTHING;
  85                 goto out_free;
  86         }
  87
  88         ASSERT(ip != NULL);
  89         ASSERT(ip->i_imap.im_blkno != 0);
  90
  91         dic = &ip->i_d;
  92         inode = VFS_I(ip);
  93
  94         /* xfs_iget returns the following without needing
  95          * further change.
  96          */
  97         buf->bs_nlink = dic->di_nlink;
  98         buf->bs_projid = dic->di_projid;
  99         buf->bs_ino = ino;
 100         buf->bs_mode = dic->di_mode;
 101         buf->bs_uid = dic->di_uid;
 102         buf->bs_gid = dic->di_gid;
 103         buf->bs_size = dic->di_size;
 104
 105         /*
 106          * We need to read the timestamps from the Linux inode because
 107          * the VFS keeps writing directly into the inode structure instead
 108          * of telling us about the updates.
 109          */
 110         buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
 111         buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
 112         buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
 113         buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
 114         buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
 115         buf->bs_ctime.tv_nsec = inode->i_ctime.tv_nsec;
 116
 117         buf->bs_xflags = xfs_ip2xflags(ip);
 118         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
 119         buf->bs_extents = dic->di_nextents;
 120         buf->bs_gen = dic->di_gen;
 121         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 122         buf->bs_dmevmask = dic->di_dmevmask;
 123         buf->bs_dmstate = dic->di_dmstate;
 124         buf->bs_aextents = dic->di_anextents;
 125         buf->bs_forkoff = XFS_IFORK_BOFF(ip);
 126
 127         switch (dic->di_format) {
 128         case XFS_DINODE_FMT_DEV:
 129                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 130                 buf->bs_blksize = BLKDEV_IOSIZE;
 131                 buf->bs_blocks = 0;
 132                 break;
 133         case XFS_DINODE_FMT_LOCAL:
 134         case XFS_DINODE_FMT_UUID:
 135                 buf->bs_rdev = 0;
 136                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 137                 buf->bs_blocks = 0;
 138                 break;
 139         case XFS_DINODE_FMT_EXTENTS:
 140         case XFS_DINODE_FMT_BTREE:
 141                 buf->bs_rdev = 0;
 142                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 143                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 144                 break;
 145         }
 146         xfs_iput(ip, XFS_ILOCK_SHARED);
 147
 148         error = formatter(buffer, ubsize, ubused, buf);
 149
 150         if (!error)
 151                 *stat = BULKSTAT_RV_DIDONE;
 152
 153  out_free:
 154         kmem_free(buf);
 155         return error;
 156 }
 157
 158 /* Return 0 on success or positive error */
 159 STATIC int
 160 xfs_bulkstat_one_fmt(
 161         void                    __user *ubuffer,
 162         int                     ubsize,
 163         int                     *ubused,
 164         const xfs_bstat_t       *buffer)
 165 {
 166         if (ubsize < sizeof(*buffer))
 167                 return XFS_ERROR(ENOMEM);
 168         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 169                 return XFS_ERROR(EFAULT);
 170         if (ubused)
 171                 *ubused = sizeof(*buffer);
 172         return 0;
 173 }
 174
 175 int
 176 xfs_bulkstat_one(
 177         xfs_mount_t     *mp,            /* mount point for filesystem */
 178         xfs_ino_t       ino,            /* inode number to get data for */
 179         void            __user *buffer, /* buffer to place output in */
 180         int             ubsize,         /* size of buffer */
 181         int             *ubused,        /* bytes used by me */
 182         int             *stat)          /* BULKSTAT_RV_... */
 183 {
 184         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 185                                     xfs_bulkstat_one_fmt, ubused, stat);
 186 }
 187
 188 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 189
 190 /*
 191  * Return stat information in bulk (by-inode) for the filesystem.
 192  */
 193 int                                     /* error status */
 194 xfs_bulkstat(
 195         xfs_mount_t             *mp,    /* mount point for filesystem */
 196         xfs_ino_t               *lastinop, /* last inode returned */
 197         int                     *ubcountp, /* size of buffer/count returned */
 198         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 199         size_t                  statstruct_size, /* sizeof struct filling */
 200         char                    __user *ubuffer, /* buffer with inode stats */
 201         int                     *done)  /* 1 if there are more stats to get */
 202 {
 203         xfs_agblock_t           agbno=0;/* allocation group block number */
 204         xfs_buf_t               *agbp;  /* agi header buffer */
 205         xfs_agi_t               *agi;   /* agi header data */
 206         xfs_agino_t             agino;  /* inode # in allocation group */
 207         xfs_agnumber_t          agno;   /* allocation group number */
 208         xfs_daddr_t             bno;    /* inode cluster start daddr */
 209         int                     chunkidx; /* current index into inode chunk */
 210         int                     clustidx; /* current index into inode cluster */
 211         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 212         int                     end_of_ag; /* set if we've seen the ag end */
 213         int                     error;  /* error code */
 214         int                     fmterror;/* bulkstat formatter result */
 215         int                     i;      /* loop index */
 216         int                     icount; /* count of inodes good in irbuf */
 217         size_t                  irbsize; /* size of irec buffer in bytes */
 218         xfs_ino_t               ino;    /* inode number (filesystem) */
 219         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 220         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 221         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 222         xfs_ino_t               lastino; /* last inode number returned */
 223         int                     nbcluster; /* # of blocks in a cluster */
 224         int                     nicluster; /* # of inodes in a cluster */
 225         int                     nimask; /* mask for inode clusters */
 226         int                     nirbuf; /* size of irbuf */
 227         int                     rval;   /* return value error code */
 228         int                     tmp;    /* result value from btree calls */
 229         int                     ubcount; /* size of user's buffer */
 230         int                     ubleft; /* bytes left in user's buffer */
 231         char                    __user *ubufp;  /* pointer into user's buffer */
 232         int                     ubelem; /* spaces used in user's buffer */
 233         int                     ubused; /* bytes used by formatter */
 234         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 235
 236         /*
 237          * Get the last inode value, see if there's nothing to do.
 238          */
 239         ino = (xfs_ino_t)*lastinop;
 240         lastino = ino;
 241         agno = XFS_INO_TO_AGNO(mp, ino);
 242         agino = XFS_INO_TO_AGINO(mp, ino);
 243         if (agno >= mp->m_sb.sb_agcount ||
 244             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 245                 *done = 1;
 246                 *ubcountp = 0;
 247                 return 0;
 248         }
 249         if (!ubcountp || *ubcountp <= 0) {
 250                 return EINVAL;
 251         }
 252         ubcount = *ubcountp; /* statstruct's */
 253         ubleft = ubcount * statstruct_size; /* bytes */
 254         *ubcountp = ubelem = 0;
 255         *done = 0;
 256         fmterror = 0;
 257         ubufp = ubuffer;
 258         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 259                 mp->m_sb.sb_inopblock :
 260                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 261         nimask = ~(nicluster - 1);
 262         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 263         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4);
 264         if (!irbuf)
 265                 return ENOMEM;
 266
 267         nirbuf = irbsize / sizeof(*irbuf);
 268
 269         /*
 270          * Loop over the allocation groups, starting from the last
 271          * inode returned; 0 means start of the allocation group.
 272          */
 273         rval = 0;
 274         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 275                 cond_resched();
 276                 bp = NULL;
 277                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 278                 if (error) {
 279                         /*
 280                          * Skip this allocation group and go to the next one.
 281                          */
 282                         agno++;
 283                         agino = 0;
 284                         continue;
 285                 }
 286                 agi = XFS_BUF_TO_AGI(agbp);
 287                 /*
 288                  * Allocate and initialize a btree cursor for ialloc btree.
 289                  */
 290                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 291                 irbp = irbuf;
 292                 irbufend = irbuf + nirbuf;
 293                 end_of_ag = 0;
 294                 /*
 295                  * If we're returning in the middle of an allocation group,
 296                  * we need to get the remainder of the chunk we're in.
 297                  */
 298                 if (agino > 0) {
 299                         xfs_inobt_rec_incore_t r;
 300
 301                         /*
 302                          * Lookup the inode chunk that this inode lives in.
 303                          */
 304                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE,
 305                                                  &tmp);
 306                         if (!error &&   /* no I/O error */
 307                             tmp &&      /* lookup succeeded */
 308                                         /* got the record, should always work */
 309                             !(error = xfs_inobt_get_rec(cur, &r, &i)) &&
 310                             i == 1 &&
 311                                         /* this is the right chunk */
 312                             agino < r.ir_startino + XFS_INODES_PER_CHUNK &&
 313                                         /* lastino was not last in chunk */
 314                             (chunkidx = agino - r.ir_startino + 1) <
 315                                     XFS_INODES_PER_CHUNK &&
 316                                         /* there are some left allocated */
 317                             xfs_inobt_maskn(chunkidx,
 318                                     XFS_INODES_PER_CHUNK - chunkidx) &
 319                                     ~r.ir_free) {
 320                                 /*
 321                                  * Grab the chunk record.  Mark all the
 322                                  * uninteresting inodes (because they're
 323                                  * before our start point) free.
 324                                  */
 325                                 for (i = 0; i < chunkidx; i++) {
 326                                         if (XFS_INOBT_MASK(i) & ~r.ir_free)
 327                                                 r.ir_freecount++;
 328                                 }
 329                                 r.ir_free |= xfs_inobt_maskn(0, chunkidx);
 330                                 irbp->ir_startino = r.ir_startino;
 331                                 irbp->ir_freecount = r.ir_freecount;
 332                                 irbp->ir_free = r.ir_free;
 333                                 irbp++;
 334                                 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 335                                 icount = XFS_INODES_PER_CHUNK - r.ir_freecount;
 336                         } else {
 337                                 /*
 338                                  * If any of those tests failed, bump the
 339                                  * inode number (just in case).
 340                                  */
 341                                 agino++;
 342                                 icount = 0;
 343                         }
 344                         /*
 345                          * In any case, increment to the next record.
 346                          */
 347                         if (!error)
 348                                 error = xfs_btree_increment(cur, 0, &tmp);
 349                 } else {
 350                         /*
 351                          * Start of ag.  Lookup the first inode chunk.
 352                          */
 353                         error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
 354                         icount = 0;
 355                 }
 356                 /*
 357                  * Loop through inode btree records in this ag,
 358                  * until we run out of inodes or space in the buffer.
 359                  */
 360                 while (irbp < irbufend && icount < ubcount) {
 361                         xfs_inobt_rec_incore_t r;
 362
 363                         /*
 364                          * Loop as long as we're unable to read the
 365                          * inode btree.
 366                          */
 367                         while (error) {
 368                                 agino += XFS_INODES_PER_CHUNK;
 369                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 370                                                 be32_to_cpu(agi->agi_length))
 371                                         break;
 372                                 error = xfs_inobt_lookup(cur, agino,
 373                                                          XFS_LOOKUP_GE, &tmp);
 374                                 cond_resched();
 375                         }
 376                         /*
 377                          * If ran off the end of the ag either with an error,
 378                          * or the normal way, set end and stop collecting.
 379                          */
 380                         if (error) {
 381                                 end_of_ag = 1;
 382                                 break;
 383                         }
 384
 385                         error = xfs_inobt_get_rec(cur, &r, &i);
 386                         if (error || i == 0) {
 387                                 end_of_ag = 1;
 388                                 break;
 389                         }
 390
 391                         /*
 392                          * If this chunk has any allocated inodes, save it.
 393                          * Also start read-ahead now for this chunk.
 394                          */
 395                         if (r.ir_freecount < XFS_INODES_PER_CHUNK) {
 396                                 /*
 397                                  * Loop over all clusters in the next chunk.
 398                                  * Do a readahead if there are any allocated
 399                                  * inodes in that cluster.
 400                                  */
 401                                 agbno = XFS_AGINO_TO_AGBNO(mp, r.ir_startino);
 402                                 for (chunkidx = 0;
 403                                      chunkidx < XFS_INODES_PER_CHUNK;
 404                                      chunkidx += nicluster,
 405                                      agbno += nbcluster) {
 406                                         if (xfs_inobt_maskn(chunkidx, nicluster)
 407                                                         & ~r.ir_free)
 408                                                 xfs_btree_reada_bufs(mp, agno,
 409                                                         agbno, nbcluster);
 410                                 }
 411                                 irbp->ir_startino = r.ir_startino;
 412                                 irbp->ir_freecount = r.ir_freecount;
 413                                 irbp->ir_free = r.ir_free;
 414                                 irbp++;
 415                                 icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
 416                         }
 417                         /*
 418                          * Set agino to after this chunk and bump the cursor.
 419                          */
 420                         agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 421                         error = xfs_btree_increment(cur, 0, &tmp);
 422                         cond_resched();
 423                 }
 424                 /*
 425                  * Drop the btree buffers and the agi buffer.
 426                  * We can't hold any of the locks these represent
 427                  * when calling iget.
 428                  */
 429                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 430                 xfs_buf_relse(agbp);
 431                 /*
 432                  * Now format all the good inodes into the user's buffer.
 433                  */
 434                 irbufend = irbp;
 435                 for (irbp = irbuf;
 436                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 437                         /*
 438                          * Now process this chunk of inodes.
 439                          */
 440                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 441                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 442                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 443                              chunkidx++, clustidx++, agino++) {
 444                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 445                                 /*
 446                                  * Recompute agbno if this is the
 447                                  * first inode of the cluster.
 448                                  *
 449                                  * Careful with clustidx.   There can be
 450                                  * multiple clusters per chunk, a single
 451                                  * cluster per chunk or a cluster that has
 452                                  * inodes represented from several different
 453                                  * chunks (if blocksize is large).
 454                                  *
 455                                  * Because of this, the starting clustidx is
 456                                  * initialized to zero in this loop but must
 457                                  * later be reset after reading in the cluster
 458                                  * buffer.
 459                                  */
 460                                 if ((chunkidx & (nicluster - 1)) == 0) {
 461                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 462                                                         irbp->ir_startino) +
 463                                                 ((chunkidx & nimask) >>
 464                                                  mp->m_sb.sb_inopblog);
 465                                 }
 466                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 467                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 468                                 /*
 469                                  * Skip if this inode is free.
 470                                  */
 471                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 472                                         lastino = ino;
 473                                         continue;
 474                                 }
 475                                 /*
 476                                  * Count used inodes as free so we can tell
 477                                  * when the chunk is used up.
 478                                  */
 479                                 irbp->ir_freecount++;
 480
 481                                 /*
 482                                  * Get the inode and fill in a single buffer.
 483                                  */
 484                                 ubused = statstruct_size;
 485                                 error = formatter(mp, ino, ubufp, ubleft,
 486                                                   &ubused, &fmterror);
 487                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 488                                         if (error && error != ENOENT &&
 489                                                 error != EINVAL) {
 490                                                 ubleft = 0;
 491                                                 rval = error;
 492                                                 break;
 493                                         }
 494                                         lastino = ino;
 495                                         continue;
 496                                 }
 497                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 498                                         ubleft = 0;
 499                                         ASSERT(error);
 500                                         rval = error;
 501                                         break;
 502                                 }
 503                                 if (ubufp)
 504                                         ubufp += ubused;
 505                                 ubleft -= ubused;
 506                                 ubelem++;
 507                                 lastino = ino;
 508                         }
 509
 510                         cond_resched();
 511                 }
 512
 513                 if (bp)
 514                         xfs_buf_relse(bp);
 515
 516                 /*
 517                  * Set up for the next loop iteration.
 518                  */
 519                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 520                         if (end_of_ag) {
 521                                 agno++;
 522                                 agino = 0;
 523                         } else
 524                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 525                 } else
 526                         break;
 527         }
 528         /*
 529          * Done, we're either out of filesystem or space to put the data.
 530          */
 531         kmem_free_large(irbuf);
 532         *ubcountp = ubelem;
 533         /*
 534          * Found some inodes, return them now and return the error next time.
 535          */
 536         if (ubelem)
 537                 rval = 0;
 538         if (agno >= mp->m_sb.sb_agcount) {
 539                 /*
 540                  * If we ran out of filesystem, mark lastino as off
 541                  * the end of the filesystem, so the next call
 542                  * will return immediately.
 543                  */
 544                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 545                 *done = 1;
 546         } else
 547                 *lastinop = (xfs_ino_t)lastino;
 548
 549         return rval;
 550 }
 551
 552 /*
 553  * Return stat information in bulk (by-inode) for the filesystem.
 554  * Special case for non-sequential one inode bulkstat.
 555  */
 556 int                                     /* error status */
 557 xfs_bulkstat_single(
 558         xfs_mount_t             *mp,    /* mount point for filesystem */
 559         xfs_ino_t               *lastinop, /* inode to return */
 560         char                    __user *buffer, /* buffer with inode stats */
 561         int                     *done)  /* 1 if there are more stats to get */
 562 {
 563         int                     count;  /* count value for bulkstat call */
 564         int                     error;  /* return value */
 565         xfs_ino_t               ino;    /* filesystem inode number */
 566         int                     res;    /* result from bs1 */
 567
 568         /*
 569          * note that requesting valid inode numbers which are not allocated
 570          * to inodes will most likely cause xfs_itobp to generate warning
 571          * messages about bad magic numbers. This is ok. The fact that
 572          * the inode isn't actually an inode is handled by the
 573          * error check below. Done this way to make the usual case faster
 574          * at the expense of the error case.
 575          */
 576
 577         ino = (xfs_ino_t)*lastinop;
 578         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t), 0, &res);
 579         if (error) {
 580                 /*
 581                  * Special case way failed, do it the "long" way
 582                  * to see if that works.
 583                  */
 584                 (*lastinop)--;
 585                 count = 1;
 586                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 587                                 sizeof(xfs_bstat_t), buffer, done))
 588                         return error;
 589                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 590                         return error == EFSCORRUPTED ?
 591                                 XFS_ERROR(EINVAL) : error;
 592                 else
 593                         return 0;
 594         }
 595         *done = 0;
 596         return 0;
 597 }
 598
 599 int
 600 xfs_inumbers_fmt(
 601         void                    __user *ubuffer, /* buffer to write to */
 602         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 603         long                    count,          /* # of elements to read */
 604         long                    *written)       /* # of bytes written */
 605 {
 606         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 607                 return -EFAULT;
 608         *written = count * sizeof(*buffer);
 609         return 0;
 610 }
 611
 612 /*
 613  * Return inode number table for the filesystem.
 614  */
 615 int                                     /* error status */
 616 xfs_inumbers(
 617         xfs_mount_t     *mp,            /* mount point for filesystem */
 618         xfs_ino_t       *lastino,       /* last inode returned */
 619         int             *count,         /* size of buffer/count returned */
 620         void            __user *ubuffer,/* buffer with inode descriptions */
 621         inumbers_fmt_pf formatter)
 622 {
 623         xfs_buf_t       *agbp;
 624         xfs_agino_t     agino;
 625         xfs_agnumber_t  agno;
 626         int             bcount;
 627         xfs_inogrp_t    *buffer;
 628         int             bufidx;
 629         xfs_btree_cur_t *cur;
 630         int             error;
 631         xfs_inobt_rec_incore_t r;
 632         int             i;
 633         xfs_ino_t       ino;
 634         int             left;
 635         int             tmp;
 636
 637         ino = (xfs_ino_t)*lastino;
 638         agno = XFS_INO_TO_AGNO(mp, ino);
 639         agino = XFS_INO_TO_AGINO(mp, ino);
 640         left = *count;
 641         *count = 0;
 642         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 643         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 644         error = bufidx = 0;
 645         cur = NULL;
 646         agbp = NULL;
 647         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 648                 if (agbp == NULL) {
 649                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 650                         if (error) {
 651                                 /*
 652                                  * If we can't read the AGI of this ag,
 653                                  * then just skip to the next one.
 654                                  */
 655                                 ASSERT(cur == NULL);
 656                                 agbp = NULL;
 657                                 agno++;
 658                                 agino = 0;
 659                                 continue;
 660                         }
 661                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 662                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
 663                                                  &tmp);
 664                         if (error) {
 665                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 666                                 cur = NULL;
 667                                 xfs_buf_relse(agbp);
 668                                 agbp = NULL;
 669                                 /*
 670                                  * Move up the last inode in the current
 671                                  * chunk.  The lookup_ge will always get
 672                                  * us the first inode in the next chunk.
 673                                  */
 674                                 agino += XFS_INODES_PER_CHUNK - 1;
 675                                 continue;
 676                         }
 677                 }
 678                 error = xfs_inobt_get_rec(cur, &r, &i);
 679                 if (error || i == 0) {
 680                         xfs_buf_relse(agbp);
 681                         agbp = NULL;
 682                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 683                         cur = NULL;
 684                         agno++;
 685                         agino = 0;
 686                         continue;
 687                 }
 688                 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
 689                 buffer[bufidx].xi_startino =
 690                         XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
 691                 buffer[bufidx].xi_alloccount =
 692                         XFS_INODES_PER_CHUNK - r.ir_freecount;
 693                 buffer[bufidx].xi_allocmask = ~r.ir_free;
 694                 bufidx++;
 695                 left--;
 696                 if (bufidx == bcount) {
 697                         long written;
 698                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 699                                 error = XFS_ERROR(EFAULT);
 700                                 break;
 701                         }
 702                         ubuffer += written;
 703                         *count += bufidx;
 704                         bufidx = 0;
 705                 }
 706                 if (left) {
 707                         error = xfs_btree_increment(cur, 0, &tmp);
 708                         if (error) {
 709                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 710                                 cur = NULL;
 711                                 xfs_buf_relse(agbp);
 712                                 agbp = NULL;
 713                                 /*
 714                                  * The agino value has already been bumped.
 715                                  * Just try to skip up to it.
 716                                  */
 717                                 agino += XFS_INODES_PER_CHUNK;
 718                                 continue;
 719                         }
 720                 }
 721         }
 722         if (!error) {
 723                 if (bufidx) {
 724                         long written;
 725                         if (formatter(ubuffer, buffer, bufidx, &written))
 726                                 error = XFS_ERROR(EFAULT);
 727                         else
 728                                 *count += bufidx;
 729                 }
 730                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 731         }
 732         kmem_free(buffer);
 733         if (cur)
 734                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 735                                            XFS_BTREE_NOERROR));
 736         if (agbp)
 737                 xfs_buf_relse(agbp);
 738         return error;
 739 }