fs/xfs/xfs_itable.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_inode.h"
  14 #include "xfs_btree.h"
  15 #include "xfs_ialloc.h"
  16 #include "xfs_ialloc_btree.h"
  17 #include "xfs_itable.h"
  18 #include "xfs_error.h"
  19 #include "xfs_trace.h"
  20 #include "xfs_icache.h"
  21
  22 /*
  23  * Return stat information for one inode.
  24  * Return 0 if ok, else errno.
  25  */
  26 int
  27 xfs_bulkstat_one_int(
  28         struct xfs_mount        *mp,            /* mount point for filesystem */
  29         xfs_ino_t               ino,            /* inode to get data for */
  30         void __user             *buffer,        /* buffer to place output in */
  31         int                     ubsize,         /* size of buffer */
  32         bulkstat_one_fmt_pf     formatter,      /* formatter, copy to user */
  33         int                     *ubused,        /* bytes used by me */
  34         int                     *stat)          /* BULKSTAT_RV_... */
  35 {
  36         struct xfs_icdinode     *dic;           /* dinode core info pointer */
  37         struct xfs_inode        *ip;            /* incore inode pointer */
  38         struct inode            *inode;
  39         struct xfs_bstat        *buf;           /* return buffer */
  40         int                     error = 0;      /* error value */
  41
  42         *stat = BULKSTAT_RV_NOTHING;
  43
  44         if (!buffer || xfs_internal_inum(mp, ino))
  45                 return -EINVAL;
  46
  47         buf = kmem_zalloc(sizeof(*buf), KM_SLEEP | KM_MAYFAIL);
  48         if (!buf)
  49                 return -ENOMEM;
  50
  51         error = xfs_iget(mp, NULL, ino,
  52                          (XFS_IGET_DONTCACHE | XFS_IGET_UNTRUSTED),
  53                          XFS_ILOCK_SHARED, &ip);
  54         if (error)
  55                 goto out_free;
  56
  57         ASSERT(ip != NULL);
  58         ASSERT(ip->i_imap.im_blkno != 0);
  59         inode = VFS_I(ip);
  60
  61         dic = &ip->i_d;
  62
  63         /* xfs_iget returns the following without needing
  64          * further change.
  65          */
  66         buf->bs_projid_lo = dic->di_projid_lo;
  67         buf->bs_projid_hi = dic->di_projid_hi;
  68         buf->bs_ino = ino;
  69         buf->bs_uid = dic->di_uid;
  70         buf->bs_gid = dic->di_gid;
  71         buf->bs_size = dic->di_size;
  72
  73         buf->bs_nlink = inode->i_nlink;
  74         buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
  75         buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
  76         buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
  77         buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
  78         buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
  79         buf->bs_ctime.tv_nsec = inode->i_ctime.tv_nsec;
  80         buf->bs_gen = inode->i_generation;
  81         buf->bs_mode = inode->i_mode;
  82
  83         buf->bs_xflags = xfs_ip2xflags(ip);
  84         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  85         buf->bs_extents = dic->di_nextents;
  86         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  87         buf->bs_dmevmask = dic->di_dmevmask;
  88         buf->bs_dmstate = dic->di_dmstate;
  89         buf->bs_aextents = dic->di_anextents;
  90         buf->bs_forkoff = XFS_IFORK_BOFF(ip);
  91
  92         if (dic->di_version == 3) {
  93                 if (dic->di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
  94                         buf->bs_cowextsize = dic->di_cowextsize <<
  95                                         mp->m_sb.sb_blocklog;
  96         }
  97
  98         switch (dic->di_format) {
  99         case XFS_DINODE_FMT_DEV:
 100                 buf->bs_rdev = sysv_encode_dev(inode->i_rdev);
 101                 buf->bs_blksize = BLKDEV_IOSIZE;
 102                 buf->bs_blocks = 0;
 103                 break;
 104         case XFS_DINODE_FMT_LOCAL:
 105                 buf->bs_rdev = 0;
 106                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 107                 buf->bs_blocks = 0;
 108                 break;
 109         case XFS_DINODE_FMT_EXTENTS:
 110         case XFS_DINODE_FMT_BTREE:
 111                 buf->bs_rdev = 0;
 112                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 113                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 114                 break;
 115         }
 116         xfs_iunlock(ip, XFS_ILOCK_SHARED);
 117         xfs_irele(ip);
 118
 119         error = formatter(buffer, ubsize, ubused, buf);
 120         if (!error)
 121                 *stat = BULKSTAT_RV_DIDONE;
 122
 123  out_free:
 124         kmem_free(buf);
 125         return error;
 126 }
 127
 128 /* Return 0 on success or positive error */
 129 STATIC int
 130 xfs_bulkstat_one_fmt(
 131         void                    __user *ubuffer,
 132         int                     ubsize,
 133         int                     *ubused,
 134         const xfs_bstat_t       *buffer)
 135 {
 136         if (ubsize < sizeof(*buffer))
 137                 return -ENOMEM;
 138         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 139                 return -EFAULT;
 140         if (ubused)
 141                 *ubused = sizeof(*buffer);
 142         return 0;
 143 }
 144
 145 int
 146 xfs_bulkstat_one(
 147         xfs_mount_t     *mp,            /* mount point for filesystem */
 148         xfs_ino_t       ino,            /* inode number to get data for */
 149         void            __user *buffer, /* buffer to place output in */
 150         int             ubsize,         /* size of buffer */
 151         int             *ubused,        /* bytes used by me */
 152         int             *stat)          /* BULKSTAT_RV_... */
 153 {
 154         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 155                                     xfs_bulkstat_one_fmt, ubused, stat);
 156 }
 157
 158 /*
 159  * Loop over all clusters in a chunk for a given incore inode allocation btree
 160  * record.  Do a readahead if there are any allocated inodes in that cluster.
 161  */
 162 STATIC void
 163 xfs_bulkstat_ichunk_ra(
 164         struct xfs_mount                *mp,
 165         xfs_agnumber_t                  agno,
 166         struct xfs_inobt_rec_incore     *irec)
 167 {
 168         xfs_agblock_t                   agbno;
 169         struct blk_plug                 plug;
 170         int                             blks_per_cluster;
 171         int                             inodes_per_cluster;
 172         int                             i;      /* inode chunk index */
 173
 174         agbno = XFS_AGINO_TO_AGBNO(mp, irec->ir_startino);
 175         blks_per_cluster = xfs_icluster_size_fsb(mp);
 176         inodes_per_cluster = blks_per_cluster << mp->m_sb.sb_inopblog;
 177
 178         blk_start_plug(&plug);
 179         for (i = 0; i < XFS_INODES_PER_CHUNK;
 180              i += inodes_per_cluster, agbno += blks_per_cluster) {
 181                 if (xfs_inobt_maskn(i, inodes_per_cluster) & ~irec->ir_free) {
 182                         xfs_btree_reada_bufs(mp, agno, agbno, blks_per_cluster,
 183                                              &xfs_inode_buf_ops);
 184                 }
 185         }
 186         blk_finish_plug(&plug);
 187 }
 188
 189 /*
 190  * Lookup the inode chunk that the given inode lives in and then get the record
 191  * if we found the chunk.  If the inode was not the last in the chunk and there
 192  * are some left allocated, update the data for the pointed-to record as well as
 193  * return the count of grabbed inodes.
 194  */
 195 STATIC int
 196 xfs_bulkstat_grab_ichunk(
 197         struct xfs_btree_cur            *cur,   /* btree cursor */
 198         xfs_agino_t                     agino,  /* starting inode of chunk */
 199         int                             *icount,/* return # of inodes grabbed */
 200         struct xfs_inobt_rec_incore     *irec)  /* btree record */
 201 {
 202         int                             idx;    /* index into inode chunk */
 203         int                             stat;
 204         int                             error = 0;
 205
 206         /* Lookup the inode chunk that this inode lives in */
 207         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &stat);
 208         if (error)
 209                 return error;
 210         if (!stat) {
 211                 *icount = 0;
 212                 return error;
 213         }
 214
 215         /* Get the record, should always work */
 216         error = xfs_inobt_get_rec(cur, irec, &stat);
 217         if (error)
 218                 return error;
 219         XFS_WANT_CORRUPTED_RETURN(cur->bc_mp, stat == 1);
 220
 221         /* Check if the record contains the inode in request */
 222         if (irec->ir_startino + XFS_INODES_PER_CHUNK <= agino) {
 223                 *icount = 0;
 224                 return 0;
 225         }
 226
 227         idx = agino - irec->ir_startino + 1;
 228         if (idx < XFS_INODES_PER_CHUNK &&
 229             (xfs_inobt_maskn(idx, XFS_INODES_PER_CHUNK - idx) & ~irec->ir_free)) {
 230                 int     i;
 231
 232                 /* We got a right chunk with some left inodes allocated at it.
 233                  * Grab the chunk record.  Mark all the uninteresting inodes
 234                  * free -- because they're before our start point.
 235                  */
 236                 for (i = 0; i < idx; i++) {
 237                         if (XFS_INOBT_MASK(i) & ~irec->ir_free)
 238                                 irec->ir_freecount++;
 239                 }
 240
 241                 irec->ir_free |= xfs_inobt_maskn(0, idx);
 242                 *icount = irec->ir_count - irec->ir_freecount;
 243         }
 244
 245         return 0;
 246 }
 247
 248 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 249
 250 struct xfs_bulkstat_agichunk {
 251         char            __user **ac_ubuffer;/* pointer into user's buffer */
 252         int             ac_ubleft;      /* bytes left in user's buffer */
 253         int             ac_ubelem;      /* spaces used in user's buffer */
 254 };
 255
 256 /*
 257  * Process inodes in chunk with a pointer to a formatter function
 258  * that will iget the inode and fill in the appropriate structure.
 259  */
 260 static int
 261 xfs_bulkstat_ag_ichunk(
 262         struct xfs_mount                *mp,
 263         xfs_agnumber_t                  agno,
 264         struct xfs_inobt_rec_incore     *irbp,
 265         bulkstat_one_pf                 formatter,
 266         size_t                          statstruct_size,
 267         struct xfs_bulkstat_agichunk    *acp,
 268         xfs_agino_t                     *last_agino)
 269 {
 270         char                            __user **ubufp = acp->ac_ubuffer;
 271         int                             chunkidx;
 272         int                             error = 0;
 273         xfs_agino_t                     agino = irbp->ir_startino;
 274
 275         for (chunkidx = 0; chunkidx < XFS_INODES_PER_CHUNK;
 276              chunkidx++, agino++) {
 277                 int             fmterror;
 278                 int             ubused;
 279
 280                 /* inode won't fit in buffer, we are done */
 281                 if (acp->ac_ubleft < statstruct_size)
 282                         break;
 283
 284                 /* Skip if this inode is free */
 285                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free)
 286                         continue;
 287
 288                 /* Get the inode and fill in a single buffer */
 289                 ubused = statstruct_size;
 290                 error = formatter(mp, XFS_AGINO_TO_INO(mp, agno, agino),
 291                                   *ubufp, acp->ac_ubleft, &ubused, &fmterror);
 292
 293                 if (fmterror == BULKSTAT_RV_GIVEUP ||
 294                     (error && error != -ENOENT && error != -EINVAL)) {
 295                         acp->ac_ubleft = 0;
 296                         ASSERT(error);
 297                         break;
 298                 }
 299
 300                 /* be careful not to leak error if at end of chunk */
 301                 if (fmterror == BULKSTAT_RV_NOTHING || error) {
 302                         error = 0;
 303                         continue;
 304                 }
 305
 306                 *ubufp += ubused;
 307                 acp->ac_ubleft -= ubused;
 308                 acp->ac_ubelem++;
 309         }
 310
 311         /*
 312          * Post-update *last_agino. At this point, agino will always point one
 313          * inode past the last inode we processed successfully. Hence we
 314          * substract that inode when setting the *last_agino cursor so that we
 315          * return the correct cookie to userspace. On the next bulkstat call,
 316          * the inode under the lastino cookie will be skipped as we have already
 317          * processed it here.
 318          */
 319         *last_agino = agino - 1;
 320
 321         return error;
 322 }
 323
 324 /*
 325  * Return stat information in bulk (by-inode) for the filesystem.
 326  */
 327 int                                     /* error status */
 328 xfs_bulkstat(
 329         xfs_mount_t             *mp,    /* mount point for filesystem */
 330         xfs_ino_t               *lastinop, /* last inode returned */
 331         int                     *ubcountp, /* size of buffer/count returned */
 332         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 333         size_t                  statstruct_size, /* sizeof struct filling */
 334         char                    __user *ubuffer, /* buffer with inode stats */
 335         int                     *done)  /* 1 if there are more stats to get */
 336 {
 337         xfs_buf_t               *agbp;  /* agi header buffer */
 338         xfs_agino_t             agino;  /* inode # in allocation group */
 339         xfs_agnumber_t          agno;   /* allocation group number */
 340         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 341         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 342         int                     nirbuf; /* size of irbuf */
 343         int                     ubcount; /* size of user's buffer */
 344         struct xfs_bulkstat_agichunk ac;
 345         int                     error = 0;
 346
 347         /*
 348          * Get the last inode value, see if there's nothing to do.
 349          */
 350         agno = XFS_INO_TO_AGNO(mp, *lastinop);
 351         agino = XFS_INO_TO_AGINO(mp, *lastinop);
 352         if (agno >= mp->m_sb.sb_agcount ||
 353             *lastinop != XFS_AGINO_TO_INO(mp, agno, agino)) {
 354                 *done = 1;
 355                 *ubcountp = 0;
 356                 return 0;
 357         }
 358
 359         ubcount = *ubcountp; /* statstruct's */
 360         ac.ac_ubuffer = &ubuffer;
 361         ac.ac_ubleft = ubcount * statstruct_size; /* bytes */;
 362         ac.ac_ubelem = 0;
 363
 364         *ubcountp = 0;
 365         *done = 0;
 366
 367         irbuf = kmem_zalloc_large(PAGE_SIZE * 4, KM_SLEEP);
 368         if (!irbuf)
 369                 return -ENOMEM;
 370         nirbuf = (PAGE_SIZE * 4) / sizeof(*irbuf);
 371
 372         /*
 373          * Loop over the allocation groups, starting from the last
 374          * inode returned; 0 means start of the allocation group.
 375          */
 376         while (agno < mp->m_sb.sb_agcount) {
 377                 struct xfs_inobt_rec_incore     *irbp = irbuf;
 378                 struct xfs_inobt_rec_incore     *irbufend = irbuf + nirbuf;
 379                 bool                            end_of_ag = false;
 380                 int                             icount = 0;
 381                 int                             stat;
 382
 383                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 384                 if (error)
 385                         break;
 386                 /*
 387                  * Allocate and initialize a btree cursor for ialloc btree.
 388                  */
 389                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
 390                                             XFS_BTNUM_INO);
 391                 if (agino > 0) {
 392                         /*
 393                          * In the middle of an allocation group, we need to get
 394                          * the remainder of the chunk we're in.
 395                          */
 396                         struct xfs_inobt_rec_incore     r;
 397
 398                         error = xfs_bulkstat_grab_ichunk(cur, agino, &icount, &r);
 399                         if (error)
 400                                 goto del_cursor;
 401                         if (icount) {
 402                                 irbp->ir_startino = r.ir_startino;
 403                                 irbp->ir_holemask = r.ir_holemask;
 404                                 irbp->ir_count = r.ir_count;
 405                                 irbp->ir_freecount = r.ir_freecount;
 406                                 irbp->ir_free = r.ir_free;
 407                                 irbp++;
 408                         }
 409                         /* Increment to the next record */
 410                         error = xfs_btree_increment(cur, 0, &stat);
 411                 } else {
 412                         /* Start of ag.  Lookup the first inode chunk */
 413                         error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &stat);
 414                 }
 415                 if (error || stat == 0) {
 416                         end_of_ag = true;
 417                         goto del_cursor;
 418                 }
 419
 420                 /*
 421                  * Loop through inode btree records in this ag,
 422                  * until we run out of inodes or space in the buffer.
 423                  */
 424                 while (irbp < irbufend && icount < ubcount) {
 425                         struct xfs_inobt_rec_incore     r;
 426
 427                         error = xfs_inobt_get_rec(cur, &r, &stat);
 428                         if (error || stat == 0) {
 429                                 end_of_ag = true;
 430                                 goto del_cursor;
 431                         }
 432
 433                         /*
 434                          * If this chunk has any allocated inodes, save it.
 435                          * Also start read-ahead now for this chunk.
 436                          */
 437                         if (r.ir_freecount < r.ir_count) {
 438                                 xfs_bulkstat_ichunk_ra(mp, agno, &r);
 439                                 irbp->ir_startino = r.ir_startino;
 440                                 irbp->ir_holemask = r.ir_holemask;
 441                                 irbp->ir_count = r.ir_count;
 442                                 irbp->ir_freecount = r.ir_freecount;
 443                                 irbp->ir_free = r.ir_free;
 444                                 irbp++;
 445                                 icount += r.ir_count - r.ir_freecount;
 446                         }
 447                         error = xfs_btree_increment(cur, 0, &stat);
 448                         if (error || stat == 0) {
 449                                 end_of_ag = true;
 450                                 goto del_cursor;
 451                         }
 452                         cond_resched();
 453                 }
 454
 455                 /*
 456                  * Drop the btree buffers and the agi buffer as we can't hold any
 457                  * of the locks these represent when calling iget. If there is a
 458                  * pending error, then we are done.
 459                  */
 460 del_cursor:
 461                 xfs_btree_del_cursor(cur, error);
 462                 xfs_buf_relse(agbp);
 463                 if (error)
 464                         break;
 465                 /*
 466                  * Now format all the good inodes into the user's buffer. The
 467                  * call to xfs_bulkstat_ag_ichunk() sets up the agino pointer
 468                  * for the next loop iteration.
 469                  */
 470                 irbufend = irbp;
 471                 for (irbp = irbuf;
 472                      irbp < irbufend && ac.ac_ubleft >= statstruct_size;
 473                      irbp++) {
 474                         error = xfs_bulkstat_ag_ichunk(mp, agno, irbp,
 475                                         formatter, statstruct_size, &ac,
 476                                         &agino);
 477                         if (error)
 478                                 break;
 479
 480                         cond_resched();
 481                 }
 482
 483                 /*
 484                  * If we've run out of space or had a formatting error, we
 485                  * are now done
 486                  */
 487                 if (ac.ac_ubleft < statstruct_size || error)
 488                         break;
 489
 490                 if (end_of_ag) {
 491                         agno++;
 492                         agino = 0;
 493                 }
 494         }
 495         /*
 496          * Done, we're either out of filesystem or space to put the data.
 497          */
 498         kmem_free(irbuf);
 499         *ubcountp = ac.ac_ubelem;
 500
 501         /*
 502          * We found some inodes, so clear the error status and return them.
 503          * The lastino pointer will point directly at the inode that triggered
 504          * any error that occurred, so on the next call the error will be
 505          * triggered again and propagated to userspace as there will be no
 506          * formatted inodes in the buffer.
 507          */
 508         if (ac.ac_ubelem)
 509                 error = 0;
 510
 511         /*
 512          * If we ran out of filesystem, lastino will point off the end of
 513          * the filesystem so the next call will return immediately.
 514          */
 515         *lastinop = XFS_AGINO_TO_INO(mp, agno, agino);
 516         if (agno >= mp->m_sb.sb_agcount)
 517                 *done = 1;
 518
 519         return error;
 520 }
 521
 522 int
 523 xfs_inumbers_fmt(
 524         void                    __user *ubuffer, /* buffer to write to */
 525         const struct xfs_inogrp *buffer,        /* buffer to read from */
 526         long                    count,          /* # of elements to read */
 527         long                    *written)       /* # of bytes written */
 528 {
 529         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 530                 return -EFAULT;
 531         *written = count * sizeof(*buffer);
 532         return 0;
 533 }
 534
 535 /*
 536  * Return inode number table for the filesystem.
 537  */
 538 int                                     /* error status */
 539 xfs_inumbers(
 540         struct xfs_mount        *mp,/* mount point for filesystem */
 541         xfs_ino_t               *lastino,/* last inode returned */
 542         int                     *count,/* size of buffer/count returned */
 543         void                    __user *ubuffer,/* buffer with inode descriptions */
 544         inumbers_fmt_pf         formatter)
 545 {
 546         xfs_agnumber_t          agno = XFS_INO_TO_AGNO(mp, *lastino);
 547         xfs_agino_t             agino = XFS_INO_TO_AGINO(mp, *lastino);
 548         struct xfs_btree_cur    *cur = NULL;
 549         struct xfs_buf          *agbp = NULL;
 550         struct xfs_inogrp       *buffer;
 551         int                     bcount;
 552         int                     left = *count;
 553         int                     bufidx = 0;
 554         int                     error = 0;
 555
 556         *count = 0;
 557         if (agno >= mp->m_sb.sb_agcount ||
 558             *lastino != XFS_AGINO_TO_INO(mp, agno, agino))
 559                 return error;
 560
 561         bcount = min(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 562         buffer = kmem_zalloc(bcount * sizeof(*buffer), KM_SLEEP);
 563         do {
 564                 struct xfs_inobt_rec_incore     r;
 565                 int                             stat;
 566
 567                 if (!agbp) {
 568                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 569                         if (error)
 570                                 break;
 571
 572                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno,
 573                                                     XFS_BTNUM_INO);
 574                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
 575                                                  &stat);
 576                         if (error)
 577                                 break;
 578                         if (!stat)
 579                                 goto next_ag;
 580                 }
 581
 582                 error = xfs_inobt_get_rec(cur, &r, &stat);
 583                 if (error)
 584                         break;
 585                 if (!stat)
 586                         goto next_ag;
 587
 588                 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
 589                 buffer[bufidx].xi_startino =
 590                         XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
 591                 buffer[bufidx].xi_alloccount = r.ir_count - r.ir_freecount;
 592                 buffer[bufidx].xi_allocmask = ~r.ir_free;
 593                 if (++bufidx == bcount) {
 594                         long    written;
 595
 596                         error = formatter(ubuffer, buffer, bufidx, &written);
 597                         if (error)
 598                                 break;
 599                         ubuffer += written;
 600                         *count += bufidx;
 601                         bufidx = 0;
 602                 }
 603                 if (!--left)
 604                         break;
 605
 606                 error = xfs_btree_increment(cur, 0, &stat);
 607                 if (error)
 608                         break;
 609                 if (stat)
 610                         continue;
 611
 612 next_ag:
 613                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 614                 cur = NULL;
 615                 xfs_buf_relse(agbp);
 616                 agbp = NULL;
 617                 agino = 0;
 618                 agno++;
 619         } while (agno < mp->m_sb.sb_agcount);
 620
 621         if (!error) {
 622                 if (bufidx) {
 623                         long    written;
 624
 625                         error = formatter(ubuffer, buffer, bufidx, &written);
 626                         if (!error)
 627                                 *count += bufidx;
 628                 }
 629                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 630         }
 631
 632         kmem_free(buffer);
 633         if (cur)
 634                 xfs_btree_del_cursor(cur, error);
 635         if (agbp)
 636                 xfs_buf_relse(agbp);
 637
 638         return error;
 639 }