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