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 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 STATIC int
  53 xfs_bulkstat_one_iget(
  54         xfs_mount_t     *mp,            /* mount point for filesystem */
  55         xfs_ino_t       ino,            /* inode number to get data for */
  56         xfs_daddr_t     bno,            /* starting bno of inode cluster */
  57         xfs_bstat_t     *buf,           /* return buffer */
  58         int             *stat)          /* BULKSTAT_RV_... */
  59 {
  60         xfs_icdinode_t  *dic;   /* dinode core info pointer */
  61         xfs_inode_t     *ip;            /* incore inode pointer */
  62         int             error;
  63
  64         error = xfs_iget(mp, NULL, ino,
  65                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
  66         if (error) {
  67                 *stat = BULKSTAT_RV_NOTHING;
  68                 return error;
  69         }
  70
  71         ASSERT(ip != NULL);
  72         ASSERT(ip->i_imap.im_blkno != 0);
  73
  74         dic = &ip->i_d;
  75
  76         /* xfs_iget returns the following without needing
  77          * further change.
  78          */
  79         buf->bs_nlink = dic->di_nlink;
  80         buf->bs_projid = dic->di_projid;
  81         buf->bs_ino = ino;
  82         buf->bs_mode = dic->di_mode;
  83         buf->bs_uid = dic->di_uid;
  84         buf->bs_gid = dic->di_gid;
  85         buf->bs_size = dic->di_size;
  86         /*
  87          * We are reading the atime from the Linux inode because the
  88          * dinode might not be uptodate.
  89          */
  90         buf->bs_atime.tv_sec = VFS_I(ip)->i_atime.tv_sec;
  91         buf->bs_atime.tv_nsec = VFS_I(ip)->i_atime.tv_nsec;
  92         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  93         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  94         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  95         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  96         buf->bs_xflags = xfs_ip2xflags(ip);
  97         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  98         buf->bs_extents = dic->di_nextents;
  99         buf->bs_gen = dic->di_gen;
 100         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 101         buf->bs_dmevmask = dic->di_dmevmask;
 102         buf->bs_dmstate = dic->di_dmstate;
 103         buf->bs_aextents = dic->di_anextents;
 104
 105         switch (dic->di_format) {
 106         case XFS_DINODE_FMT_DEV:
 107                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 108                 buf->bs_blksize = BLKDEV_IOSIZE;
 109                 buf->bs_blocks = 0;
 110                 break;
 111         case XFS_DINODE_FMT_LOCAL:
 112         case XFS_DINODE_FMT_UUID:
 113                 buf->bs_rdev = 0;
 114                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 115                 buf->bs_blocks = 0;
 116                 break;
 117         case XFS_DINODE_FMT_EXTENTS:
 118         case XFS_DINODE_FMT_BTREE:
 119                 buf->bs_rdev = 0;
 120                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 121                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 122                 break;
 123         }
 124
 125         xfs_iput(ip, XFS_ILOCK_SHARED);
 126         return error;
 127 }
 128
 129 STATIC void
 130 xfs_bulkstat_one_dinode(
 131         xfs_mount_t     *mp,            /* mount point for filesystem */
 132         xfs_ino_t       ino,            /* inode number to get data for */
 133         xfs_dinode_t    *dic,           /* dinode inode pointer */
 134         xfs_bstat_t     *buf)           /* return buffer */
 135 {
 136         /*
 137          * The inode format changed when we moved the link count and
 138          * made it 32 bits long.  If this is an old format inode,
 139          * convert it in memory to look like a new one.  If it gets
 140          * flushed to disk we will convert back before flushing or
 141          * logging it.  We zero out the new projid field and the old link
 142          * count field.  We'll handle clearing the pad field (the remains
 143          * of the old uuid field) when we actually convert the inode to
 144          * the new format. We don't change the version number so that we
 145          * can distinguish this from a real new format inode.
 146          */
 147         if (dic->di_version == 1) {
 148                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 149                 buf->bs_projid = 0;
 150         } else {
 151                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 152                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 153         }
 154
 155         buf->bs_ino = ino;
 156         buf->bs_mode = be16_to_cpu(dic->di_mode);
 157         buf->bs_uid = be32_to_cpu(dic->di_uid);
 158         buf->bs_gid = be32_to_cpu(dic->di_gid);
 159         buf->bs_size = be64_to_cpu(dic->di_size);
 160         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 161         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 162         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 163         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 164         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 165         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 166         buf->bs_xflags = xfs_dic2xflags(dic);
 167         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 168         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 169         buf->bs_gen = be32_to_cpu(dic->di_gen);
 170         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 171         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 172         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 173         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 174
 175         switch (dic->di_format) {
 176         case XFS_DINODE_FMT_DEV:
 177                 buf->bs_rdev = xfs_dinode_get_rdev(dic);
 178                 buf->bs_blksize = BLKDEV_IOSIZE;
 179                 buf->bs_blocks = 0;
 180                 break;
 181         case XFS_DINODE_FMT_LOCAL:
 182         case XFS_DINODE_FMT_UUID:
 183                 buf->bs_rdev = 0;
 184                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 185                 buf->bs_blocks = 0;
 186                 break;
 187         case XFS_DINODE_FMT_EXTENTS:
 188         case XFS_DINODE_FMT_BTREE:
 189                 buf->bs_rdev = 0;
 190                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 191                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
 192                 break;
 193         }
 194 }
 195
 196 /* Return 0 on success or positive error */
 197 STATIC int
 198 xfs_bulkstat_one_fmt(
 199         void                    __user *ubuffer,
 200         int                     ubsize,
 201         int                     *ubused,
 202         const xfs_bstat_t       *buffer)
 203 {
 204         if (ubsize < sizeof(*buffer))
 205                 return XFS_ERROR(ENOMEM);
 206         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 207                 return XFS_ERROR(EFAULT);
 208         if (ubused)
 209                 *ubused = sizeof(*buffer);
 210         return 0;
 211 }
 212
 213 /*
 214  * Return stat information for one inode.
 215  * Return 0 if ok, else errno.
 216  */
 217 int                                     /* error status */
 218 xfs_bulkstat_one_int(
 219         xfs_mount_t     *mp,            /* mount point for filesystem */
 220         xfs_ino_t       ino,            /* inode number to get data for */
 221         void            __user *buffer, /* buffer to place output in */
 222         int             ubsize,         /* size of buffer */
 223         bulkstat_one_fmt_pf formatter,  /* formatter, copy to user */
 224         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 225         int             *ubused,        /* bytes used by me */
 226         void            *dibuff,        /* on-disk inode buffer */
 227         int             *stat)          /* BULKSTAT_RV_... */
 228 {
 229         xfs_bstat_t     *buf;           /* return buffer */
 230         int             error = 0;      /* error value */
 231         xfs_dinode_t    *dip;           /* dinode inode pointer */
 232
 233         dip = (xfs_dinode_t *)dibuff;
 234         *stat = BULKSTAT_RV_NOTHING;
 235
 236         if (!buffer || xfs_internal_inum(mp, ino))
 237                 return XFS_ERROR(EINVAL);
 238
 239         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 240
 241         if (dip == NULL) {
 242                 /* We're not being passed a pointer to a dinode.  This happens
 243                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 244                  */
 245                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 246                 if (error)
 247                         goto out_free;
 248         } else {
 249                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 250         }
 251
 252         error = formatter(buffer, ubsize, ubused, buf);
 253         if (error)
 254                 goto out_free;
 255
 256         *stat = BULKSTAT_RV_DIDONE;
 257
 258  out_free:
 259         kmem_free(buf);
 260         return error;
 261 }
 262
 263 int
 264 xfs_bulkstat_one(
 265         xfs_mount_t     *mp,            /* mount point for filesystem */
 266         xfs_ino_t       ino,            /* inode number to get data for */
 267         void            __user *buffer, /* buffer to place output in */
 268         int             ubsize,         /* size of buffer */
 269         void            *private_data,  /* my private data */
 270         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 271         int             *ubused,        /* bytes used by me */
 272         void            *dibuff,        /* on-disk inode buffer */
 273         int             *stat)          /* BULKSTAT_RV_... */
 274 {
 275         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 276                                     xfs_bulkstat_one_fmt, bno,
 277                                     ubused, dibuff, stat);
 278 }
 279
 280 /*
 281  * Test to see whether we can use the ondisk inode directly, based
 282  * on the given bulkstat flags, filling in dipp accordingly.
 283  * Returns zero if the inode is dodgey.
 284  */
 285 STATIC int
 286 xfs_bulkstat_use_dinode(
 287         xfs_mount_t     *mp,
 288         int             flags,
 289         xfs_buf_t       *bp,
 290         int             clustidx,
 291         xfs_dinode_t    **dipp)
 292 {
 293         xfs_dinode_t    *dip;
 294         unsigned int    aformat;
 295
 296         *dipp = NULL;
 297         if (!bp || (flags & BULKSTAT_FG_IGET))
 298                 return 1;
 299         dip = (xfs_dinode_t *)
 300                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 301         /*
 302          * Check the buffer containing the on-disk inode for di_mode == 0.
 303          * This is to prevent xfs_bulkstat from picking up just reclaimed
 304          * inodes that have their in-core state initialized but not flushed
 305          * to disk yet. This is a temporary hack that would require a proper
 306          * fix in the future.
 307          */
 308         if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
 309             !XFS_DINODE_GOOD_VERSION(dip->di_version) ||
 310             !dip->di_mode)
 311                 return 0;
 312         if (flags & BULKSTAT_FG_QUICK) {
 313                 *dipp = dip;
 314                 return 1;
 315         }
 316         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 317         aformat = dip->di_aformat;
 318         if ((XFS_DFORK_Q(dip) == 0) ||
 319             (aformat == XFS_DINODE_FMT_LOCAL) ||
 320             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_anextents)) {
 321                 *dipp = dip;
 322                 return 1;
 323         }
 324         return 1;
 325 }
 326
 327 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 328
 329 /*
 330  * Return stat information in bulk (by-inode) for the filesystem.
 331  */
 332 int                                     /* error status */
 333 xfs_bulkstat(
 334         xfs_mount_t             *mp,    /* mount point for filesystem */
 335         xfs_ino_t               *lastinop, /* last inode returned */
 336         int                     *ubcountp, /* size of buffer/count returned */
 337         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 338         void                    *private_data,/* private data for formatter */
 339         size_t                  statstruct_size, /* sizeof struct filling */
 340         char                    __user *ubuffer, /* buffer with inode stats */
 341         int                     flags,  /* defined in xfs_itable.h */
 342         int                     *done)  /* 1 if there are more stats to get */
 343 {
 344         xfs_agblock_t           agbno=0;/* allocation group block number */
 345         xfs_buf_t               *agbp;  /* agi header buffer */
 346         xfs_agi_t               *agi;   /* agi header data */
 347         xfs_agino_t             agino;  /* inode # in allocation group */
 348         xfs_agnumber_t          agno;   /* allocation group number */
 349         xfs_daddr_t             bno;    /* inode cluster start daddr */
 350         int                     chunkidx; /* current index into inode chunk */
 351         int                     clustidx; /* current index into inode cluster */
 352         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 353         int                     end_of_ag; /* set if we've seen the ag end */
 354         int                     error;  /* error code */
 355         int                     fmterror;/* bulkstat formatter result */
 356         __int32_t               gcnt;   /* current btree rec's count */
 357         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 358         xfs_agino_t             gino;   /* current btree rec's start inode */
 359         int                     i;      /* loop index */
 360         int                     icount; /* count of inodes good in irbuf */
 361         size_t                  irbsize; /* size of irec buffer in bytes */
 362         xfs_ino_t               ino;    /* inode number (filesystem) */
 363         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 364         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 365         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 366         xfs_ino_t               lastino; /* last inode number returned */
 367         int                     nbcluster; /* # of blocks in a cluster */
 368         int                     nicluster; /* # of inodes in a cluster */
 369         int                     nimask; /* mask for inode clusters */
 370         int                     nirbuf; /* size of irbuf */
 371         int                     rval;   /* return value error code */
 372         int                     tmp;    /* result value from btree calls */
 373         int                     ubcount; /* size of user's buffer */
 374         int                     ubleft; /* bytes left in user's buffer */
 375         char                    __user *ubufp;  /* pointer into user's buffer */
 376         int                     ubelem; /* spaces used in user's buffer */
 377         int                     ubused; /* bytes used by formatter */
 378         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 379         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 380
 381         /*
 382          * Get the last inode value, see if there's nothing to do.
 383          */
 384         ino = (xfs_ino_t)*lastinop;
 385         lastino = ino;
 386         dip = NULL;
 387         agno = XFS_INO_TO_AGNO(mp, ino);
 388         agino = XFS_INO_TO_AGINO(mp, ino);
 389         if (agno >= mp->m_sb.sb_agcount ||
 390             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 391                 *done = 1;
 392                 *ubcountp = 0;
 393                 return 0;
 394         }
 395         if (!ubcountp || *ubcountp <= 0) {
 396                 return EINVAL;
 397         }
 398         ubcount = *ubcountp; /* statstruct's */
 399         ubleft = ubcount * statstruct_size; /* bytes */
 400         *ubcountp = ubelem = 0;
 401         *done = 0;
 402         fmterror = 0;
 403         ubufp = ubuffer;
 404         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 405                 mp->m_sb.sb_inopblock :
 406                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 407         nimask = ~(nicluster - 1);
 408         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 409         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 410                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 411         nirbuf = irbsize / sizeof(*irbuf);
 412
 413         /*
 414          * Loop over the allocation groups, starting from the last
 415          * inode returned; 0 means start of the allocation group.
 416          */
 417         rval = 0;
 418         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 419                 cond_resched();
 420                 bp = NULL;
 421                 down_read(&mp->m_peraglock);
 422                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 423                 up_read(&mp->m_peraglock);
 424                 if (error) {
 425                         /*
 426                          * Skip this allocation group and go to the next one.
 427                          */
 428                         agno++;
 429                         agino = 0;
 430                         continue;
 431                 }
 432                 agi = XFS_BUF_TO_AGI(agbp);
 433                 /*
 434                  * Allocate and initialize a btree cursor for ialloc btree.
 435                  */
 436                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 437                 irbp = irbuf;
 438                 irbufend = irbuf + nirbuf;
 439                 end_of_ag = 0;
 440                 /*
 441                  * If we're returning in the middle of an allocation group,
 442                  * we need to get the remainder of the chunk we're in.
 443                  */
 444                 if (agino > 0) {
 445                         /*
 446                          * Lookup the inode chunk that this inode lives in.
 447                          */
 448                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 449                         if (!error &&   /* no I/O error */
 450                             tmp &&      /* lookup succeeded */
 451                                         /* got the record, should always work */
 452                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 453                                     &gfree, &i)) &&
 454                             i == 1 &&
 455                                         /* this is the right chunk */
 456                             agino < gino + XFS_INODES_PER_CHUNK &&
 457                                         /* lastino was not last in chunk */
 458                             (chunkidx = agino - gino + 1) <
 459                                     XFS_INODES_PER_CHUNK &&
 460                                         /* there are some left allocated */
 461                             xfs_inobt_maskn(chunkidx,
 462                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 463                                 /*
 464                                  * Grab the chunk record.  Mark all the
 465                                  * uninteresting inodes (because they're
 466                                  * before our start point) free.
 467                                  */
 468                                 for (i = 0; i < chunkidx; i++) {
 469                                         if (XFS_INOBT_MASK(i) & ~gfree)
 470                                                 gcnt++;
 471                                 }
 472                                 gfree |= xfs_inobt_maskn(0, chunkidx);
 473                                 irbp->ir_startino = gino;
 474                                 irbp->ir_freecount = gcnt;
 475                                 irbp->ir_free = gfree;
 476                                 irbp++;
 477                                 agino = gino + XFS_INODES_PER_CHUNK;
 478                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 479                         } else {
 480                                 /*
 481                                  * If any of those tests failed, bump the
 482                                  * inode number (just in case).
 483                                  */
 484                                 agino++;
 485                                 icount = 0;
 486                         }
 487                         /*
 488                          * In any case, increment to the next record.
 489                          */
 490                         if (!error)
 491                                 error = xfs_btree_increment(cur, 0, &tmp);
 492                 } else {
 493                         /*
 494                          * Start of ag.  Lookup the first inode chunk.
 495                          */
 496                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 497                         icount = 0;
 498                 }
 499                 /*
 500                  * Loop through inode btree records in this ag,
 501                  * until we run out of inodes or space in the buffer.
 502                  */
 503                 while (irbp < irbufend && icount < ubcount) {
 504                         /*
 505                          * Loop as long as we're unable to read the
 506                          * inode btree.
 507                          */
 508                         while (error) {
 509                                 agino += XFS_INODES_PER_CHUNK;
 510                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 511                                                 be32_to_cpu(agi->agi_length))
 512                                         break;
 513                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 514                                                             &tmp);
 515                                 cond_resched();
 516                         }
 517                         /*
 518                          * If ran off the end of the ag either with an error,
 519                          * or the normal way, set end and stop collecting.
 520                          */
 521                         if (error ||
 522                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 523                                     &gfree, &i)) ||
 524                             i == 0) {
 525                                 end_of_ag = 1;
 526                                 break;
 527                         }
 528                         /*
 529                          * If this chunk has any allocated inodes, save it.
 530                          * Also start read-ahead now for this chunk.
 531                          */
 532                         if (gcnt < XFS_INODES_PER_CHUNK) {
 533                                 /*
 534                                  * Loop over all clusters in the next chunk.
 535                                  * Do a readahead if there are any allocated
 536                                  * inodes in that cluster.
 537                                  */
 538                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 539                                      chunkidx = 0;
 540                                      chunkidx < XFS_INODES_PER_CHUNK;
 541                                      chunkidx += nicluster,
 542                                      agbno += nbcluster) {
 543                                         if (xfs_inobt_maskn(chunkidx,
 544                                                             nicluster) & ~gfree)
 545                                                 xfs_btree_reada_bufs(mp, agno,
 546                                                         agbno, nbcluster);
 547                                 }
 548                                 irbp->ir_startino = gino;
 549                                 irbp->ir_freecount = gcnt;
 550                                 irbp->ir_free = gfree;
 551                                 irbp++;
 552                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 553                         }
 554                         /*
 555                          * Set agino to after this chunk and bump the cursor.
 556                          */
 557                         agino = gino + XFS_INODES_PER_CHUNK;
 558                         error = xfs_btree_increment(cur, 0, &tmp);
 559                         cond_resched();
 560                 }
 561                 /*
 562                  * Drop the btree buffers and the agi buffer.
 563                  * We can't hold any of the locks these represent
 564                  * when calling iget.
 565                  */
 566                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 567                 xfs_buf_relse(agbp);
 568                 /*
 569                  * Now format all the good inodes into the user's buffer.
 570                  */
 571                 irbufend = irbp;
 572                 for (irbp = irbuf;
 573                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 574                         /*
 575                          * Now process this chunk of inodes.
 576                          */
 577                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 578                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 579                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 580                              chunkidx++, clustidx++, agino++) {
 581                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 582                                 /*
 583                                  * Recompute agbno if this is the
 584                                  * first inode of the cluster.
 585                                  *
 586                                  * Careful with clustidx.   There can be
 587                                  * multiple clusters per chunk, a single
 588                                  * cluster per chunk or a cluster that has
 589                                  * inodes represented from several different
 590                                  * chunks (if blocksize is large).
 591                                  *
 592                                  * Because of this, the starting clustidx is
 593                                  * initialized to zero in this loop but must
 594                                  * later be reset after reading in the cluster
 595                                  * buffer.
 596                                  */
 597                                 if ((chunkidx & (nicluster - 1)) == 0) {
 598                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 599                                                         irbp->ir_startino) +
 600                                                 ((chunkidx & nimask) >>
 601                                                  mp->m_sb.sb_inopblog);
 602
 603                                         if (flags & (BULKSTAT_FG_QUICK |
 604                                                      BULKSTAT_FG_INLINE)) {
 605                                                 int offset;
 606
 607                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 608                                                                        agino);
 609                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 610                                                                        agbno);
 611
 612                                                 /*
 613                                                  * Get the inode cluster buffer
 614                                                  */
 615                                                 if (bp)
 616                                                         xfs_buf_relse(bp);
 617
 618                                                 error = xfs_inotobp(mp, NULL, ino, &dip,
 619                                                                     &bp, &offset,
 620                                                                     XFS_IGET_BULKSTAT);
 621
 622                                                 if (!error)
 623                                                         clustidx = offset / mp->m_sb.sb_inodesize;
 624                                                 if (XFS_TEST_ERROR(error != 0,
 625                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 626                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 627                                                         bp = NULL;
 628                                                         ubleft = 0;
 629                                                         rval = error;
 630                                                         break;
 631                                                 }
 632                                         }
 633                                 }
 634                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 635                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 636                                 /*
 637                                  * Skip if this inode is free.
 638                                  */
 639                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 640                                         lastino = ino;
 641                                         continue;
 642                                 }
 643                                 /*
 644                                  * Count used inodes as free so we can tell
 645                                  * when the chunk is used up.
 646                                  */
 647                                 irbp->ir_freecount++;
 648                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 649                                                              clustidx, &dip)) {
 650                                         lastino = ino;
 651                                         continue;
 652                                 }
 653                                 /*
 654                                  * If we need to do an iget, cannot hold bp.
 655                                  * Drop it, until starting the next cluster.
 656                                  */
 657                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 658                                         if (bp)
 659                                                 xfs_buf_relse(bp);
 660                                         bp = NULL;
 661                                 }
 662
 663                                 /*
 664                                  * Get the inode and fill in a single buffer.
 665                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 666                                  * BULKSTAT_FG_IGET uses igets.
 667                                  * BULKSTAT_FG_INLINE uses dip if we have an
 668                                  * inline attr fork, else igets.
 669                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 670                                  * This is also used to count inodes/blks, etc
 671                                  * in xfs_qm_quotacheck.
 672                                  */
 673                                 ubused = statstruct_size;
 674                                 error = formatter(mp, ino, ubufp,
 675                                                 ubleft, private_data,
 676                                                 bno, &ubused, dip, &fmterror);
 677                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 678                                         if (error && error != ENOENT &&
 679                                                 error != EINVAL) {
 680                                                 ubleft = 0;
 681                                                 rval = error;
 682                                                 break;
 683                                         }
 684                                         lastino = ino;
 685                                         continue;
 686                                 }
 687                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 688                                         ubleft = 0;
 689                                         ASSERT(error);
 690                                         rval = error;
 691                                         break;
 692                                 }
 693                                 if (ubufp)
 694                                         ubufp += ubused;
 695                                 ubleft -= ubused;
 696                                 ubelem++;
 697                                 lastino = ino;
 698                         }
 699
 700                         cond_resched();
 701                 }
 702
 703                 if (bp)
 704                         xfs_buf_relse(bp);
 705
 706                 /*
 707                  * Set up for the next loop iteration.
 708                  */
 709                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 710                         if (end_of_ag) {
 711                                 agno++;
 712                                 agino = 0;
 713                         } else
 714                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 715                 } else
 716                         break;
 717         }
 718         /*
 719          * Done, we're either out of filesystem or space to put the data.
 720          */
 721         kmem_free(irbuf);
 722         *ubcountp = ubelem;
 723         /*
 724          * Found some inodes, return them now and return the error next time.
 725          */
 726         if (ubelem)
 727                 rval = 0;
 728         if (agno >= mp->m_sb.sb_agcount) {
 729                 /*
 730                  * If we ran out of filesystem, mark lastino as off
 731                  * the end of the filesystem, so the next call
 732                  * will return immediately.
 733                  */
 734                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 735                 *done = 1;
 736         } else
 737                 *lastinop = (xfs_ino_t)lastino;
 738
 739         return rval;
 740 }
 741
 742 /*
 743  * Return stat information in bulk (by-inode) for the filesystem.
 744  * Special case for non-sequential one inode bulkstat.
 745  */
 746 int                                     /* error status */
 747 xfs_bulkstat_single(
 748         xfs_mount_t             *mp,    /* mount point for filesystem */
 749         xfs_ino_t               *lastinop, /* inode to return */
 750         char                    __user *buffer, /* buffer with inode stats */
 751         int                     *done)  /* 1 if there are more stats to get */
 752 {
 753         int                     count;  /* count value for bulkstat call */
 754         int                     error;  /* return value */
 755         xfs_ino_t               ino;    /* filesystem inode number */
 756         int                     res;    /* result from bs1 */
 757
 758         /*
 759          * note that requesting valid inode numbers which are not allocated
 760          * to inodes will most likely cause xfs_itobp to generate warning
 761          * messages about bad magic numbers. This is ok. The fact that
 762          * the inode isn't actually an inode is handled by the
 763          * error check below. Done this way to make the usual case faster
 764          * at the expense of the error case.
 765          */
 766
 767         ino = (xfs_ino_t)*lastinop;
 768         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 769                                  NULL, 0, NULL, NULL, &res);
 770         if (error) {
 771                 /*
 772                  * Special case way failed, do it the "long" way
 773                  * to see if that works.
 774                  */
 775                 (*lastinop)--;
 776                 count = 1;
 777                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 778                                 NULL, sizeof(xfs_bstat_t), buffer,
 779                                 BULKSTAT_FG_IGET, done))
 780                         return error;
 781                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 782                         return error == EFSCORRUPTED ?
 783                                 XFS_ERROR(EINVAL) : error;
 784                 else
 785                         return 0;
 786         }
 787         *done = 0;
 788         return 0;
 789 }
 790
 791 int
 792 xfs_inumbers_fmt(
 793         void                    __user *ubuffer, /* buffer to write to */
 794         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 795         long                    count,          /* # of elements to read */
 796         long                    *written)       /* # of bytes written */
 797 {
 798         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 799                 return -EFAULT;
 800         *written = count * sizeof(*buffer);
 801         return 0;
 802 }
 803
 804 /*
 805  * Return inode number table for the filesystem.
 806  */
 807 int                                     /* error status */
 808 xfs_inumbers(
 809         xfs_mount_t     *mp,            /* mount point for filesystem */
 810         xfs_ino_t       *lastino,       /* last inode returned */
 811         int             *count,         /* size of buffer/count returned */
 812         void            __user *ubuffer,/* buffer with inode descriptions */
 813         inumbers_fmt_pf formatter)
 814 {
 815         xfs_buf_t       *agbp;
 816         xfs_agino_t     agino;
 817         xfs_agnumber_t  agno;
 818         int             bcount;
 819         xfs_inogrp_t    *buffer;
 820         int             bufidx;
 821         xfs_btree_cur_t *cur;
 822         int             error;
 823         __int32_t       gcnt;
 824         xfs_inofree_t   gfree;
 825         xfs_agino_t     gino;
 826         int             i;
 827         xfs_ino_t       ino;
 828         int             left;
 829         int             tmp;
 830
 831         ino = (xfs_ino_t)*lastino;
 832         agno = XFS_INO_TO_AGNO(mp, ino);
 833         agino = XFS_INO_TO_AGINO(mp, ino);
 834         left = *count;
 835         *count = 0;
 836         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 837         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 838         error = bufidx = 0;
 839         cur = NULL;
 840         agbp = NULL;
 841         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 842                 if (agbp == NULL) {
 843                         down_read(&mp->m_peraglock);
 844                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 845                         up_read(&mp->m_peraglock);
 846                         if (error) {
 847                                 /*
 848                                  * If we can't read the AGI of this ag,
 849                                  * then just skip to the next one.
 850                                  */
 851                                 ASSERT(cur == NULL);
 852                                 agbp = NULL;
 853                                 agno++;
 854                                 agino = 0;
 855                                 continue;
 856                         }
 857                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 858                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 859                         if (error) {
 860                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 861                                 cur = NULL;
 862                                 xfs_buf_relse(agbp);
 863                                 agbp = NULL;
 864                                 /*
 865                                  * Move up the last inode in the current
 866                                  * chunk.  The lookup_ge will always get
 867                                  * us the first inode in the next chunk.
 868                                  */
 869                                 agino += XFS_INODES_PER_CHUNK - 1;
 870                                 continue;
 871                         }
 872                 }
 873                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 874                         &i)) ||
 875                     i == 0) {
 876                         xfs_buf_relse(agbp);
 877                         agbp = NULL;
 878                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 879                         cur = NULL;
 880                         agno++;
 881                         agino = 0;
 882                         continue;
 883                 }
 884                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 885                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 886                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 887                 buffer[bufidx].xi_allocmask = ~gfree;
 888                 bufidx++;
 889                 left--;
 890                 if (bufidx == bcount) {
 891                         long written;
 892                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 893                                 error = XFS_ERROR(EFAULT);
 894                                 break;
 895                         }
 896                         ubuffer += written;
 897                         *count += bufidx;
 898                         bufidx = 0;
 899                 }
 900                 if (left) {
 901                         error = xfs_btree_increment(cur, 0, &tmp);
 902                         if (error) {
 903                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 904                                 cur = NULL;
 905                                 xfs_buf_relse(agbp);
 906                                 agbp = NULL;
 907                                 /*
 908                                  * The agino value has already been bumped.
 909                                  * Just try to skip up to it.
 910                                  */
 911                                 agino += XFS_INODES_PER_CHUNK;
 912                                 continue;
 913                         }
 914                 }
 915         }
 916         if (!error) {
 917                 if (bufidx) {
 918                         long written;
 919                         if (formatter(ubuffer, buffer, bufidx, &written))
 920                                 error = XFS_ERROR(EFAULT);
 921                         else
 922                                 *count += bufidx;
 923                 }
 924                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 925         }
 926         kmem_free(buffer);
 927         if (cur)
 928                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 929                                            XFS_BTREE_NOERROR));
 930         if (agbp)
 931                 xfs_buf_relse(agbp);
 932         return error;
 933 }