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_blkno != (xfs_daddr_t)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         vn_atime_to_bstime(VFS_I(ip), &buf->bs_atime);
  87         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  88         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  89         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  90         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  91         buf->bs_xflags = xfs_ip2xflags(ip);
  92         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  93         buf->bs_extents = dic->di_nextents;
  94         buf->bs_gen = dic->di_gen;
  95         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  96         buf->bs_dmevmask = dic->di_dmevmask;
  97         buf->bs_dmstate = dic->di_dmstate;
  98         buf->bs_aextents = dic->di_anextents;
  99
 100         switch (dic->di_format) {
 101         case XFS_DINODE_FMT_DEV:
 102                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 103                 buf->bs_blksize = BLKDEV_IOSIZE;
 104                 buf->bs_blocks = 0;
 105                 break;
 106         case XFS_DINODE_FMT_LOCAL:
 107         case XFS_DINODE_FMT_UUID:
 108                 buf->bs_rdev = 0;
 109                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 110                 buf->bs_blocks = 0;
 111                 break;
 112         case XFS_DINODE_FMT_EXTENTS:
 113         case XFS_DINODE_FMT_BTREE:
 114                 buf->bs_rdev = 0;
 115                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 116                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 117                 break;
 118         }
 119
 120         xfs_iput(ip, XFS_ILOCK_SHARED);
 121         return error;
 122 }
 123
 124 STATIC void
 125 xfs_bulkstat_one_dinode(
 126         xfs_mount_t     *mp,            /* mount point for filesystem */
 127         xfs_ino_t       ino,            /* inode number to get data for */
 128         xfs_dinode_t    *dip,           /* dinode inode pointer */
 129         xfs_bstat_t     *buf)           /* return buffer */
 130 {
 131         xfs_dinode_core_t *dic;         /* dinode core info pointer */
 132
 133         dic = &dip->di_core;
 134
 135         /*
 136          * The inode format changed when we moved the link count and
 137          * made it 32 bits long.  If this is an old format inode,
 138          * convert it in memory to look like a new one.  If it gets
 139          * flushed to disk we will convert back before flushing or
 140          * logging it.  We zero out the new projid field and the old link
 141          * count field.  We'll handle clearing the pad field (the remains
 142          * of the old uuid field) when we actually convert the inode to
 143          * the new format. We don't change the version number so that we
 144          * can distinguish this from a real new format inode.
 145          */
 146         if (dic->di_version == XFS_DINODE_VERSION_1) {
 147                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 148                 buf->bs_projid = 0;
 149         } else {
 150                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 151                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 152         }
 153
 154         buf->bs_ino = ino;
 155         buf->bs_mode = be16_to_cpu(dic->di_mode);
 156         buf->bs_uid = be32_to_cpu(dic->di_uid);
 157         buf->bs_gid = be32_to_cpu(dic->di_gid);
 158         buf->bs_size = be64_to_cpu(dic->di_size);
 159         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 160         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 161         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 162         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 163         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 164         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 165         buf->bs_xflags = xfs_dic2xflags(dip);
 166         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 167         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 168         buf->bs_gen = be32_to_cpu(dic->di_gen);
 169         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 170         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 171         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 172         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 173
 174         switch (dic->di_format) {
 175         case XFS_DINODE_FMT_DEV:
 176                 buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
 177                 buf->bs_blksize = BLKDEV_IOSIZE;
 178                 buf->bs_blocks = 0;
 179                 break;
 180         case XFS_DINODE_FMT_LOCAL:
 181         case XFS_DINODE_FMT_UUID:
 182                 buf->bs_rdev = 0;
 183                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 184                 buf->bs_blocks = 0;
 185                 break;
 186         case XFS_DINODE_FMT_EXTENTS:
 187         case XFS_DINODE_FMT_BTREE:
 188                 buf->bs_rdev = 0;
 189                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 190                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
 191                 break;
 192         }
 193 }
 194
 195 STATIC int
 196 xfs_bulkstat_one_fmt(
 197         void                    __user *ubuffer,
 198         const xfs_bstat_t       *buffer)
 199 {
 200         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 201                 return -EFAULT;
 202         return sizeof(*buffer);
 203 }
 204
 205 /*
 206  * Return stat information for one inode.
 207  * Return 0 if ok, else errno.
 208  */
 209 int                             /* error status */
 210 xfs_bulkstat_one(
 211         xfs_mount_t     *mp,            /* mount point for filesystem */
 212         xfs_ino_t       ino,            /* inode number to get data for */
 213         void            __user *buffer, /* buffer to place output in */
 214         int             ubsize,         /* size of buffer */
 215         void            *private_data,  /* my private data */
 216         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 217         int             *ubused,        /* bytes used by me */
 218         void            *dibuff,        /* on-disk inode buffer */
 219         int             *stat)          /* BULKSTAT_RV_... */
 220 {
 221         xfs_bstat_t     *buf;           /* return buffer */
 222         int             error = 0;      /* error value */
 223         xfs_dinode_t    *dip;           /* dinode inode pointer */
 224         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
 225
 226         dip = (xfs_dinode_t *)dibuff;
 227         *stat = BULKSTAT_RV_NOTHING;
 228
 229         if (!buffer || xfs_internal_inum(mp, ino))
 230                 return XFS_ERROR(EINVAL);
 231         if (ubsize < sizeof(*buf))
 232                 return XFS_ERROR(ENOMEM);
 233
 234         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 235
 236         if (dip == NULL) {
 237                 /* We're not being passed a pointer to a dinode.  This happens
 238                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 239                  */
 240                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 241                 if (error)
 242                         goto out_free;
 243         } else {
 244                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 245         }
 246
 247         error = formatter(buffer, buf);
 248         if (error < 0)  {
 249                 error = EFAULT;
 250                 goto out_free;
 251         }
 252
 253         *stat = BULKSTAT_RV_DIDONE;
 254         if (ubused)
 255                 *ubused = error;
 256
 257  out_free:
 258         kmem_free(buf);
 259         return error;
 260 }
 261
 262 /*
 263  * Test to see whether we can use the ondisk inode directly, based
 264  * on the given bulkstat flags, filling in dipp accordingly.
 265  * Returns zero if the inode is dodgey.
 266  */
 267 STATIC int
 268 xfs_bulkstat_use_dinode(
 269         xfs_mount_t     *mp,
 270         int             flags,
 271         xfs_buf_t       *bp,
 272         int             clustidx,
 273         xfs_dinode_t    **dipp)
 274 {
 275         xfs_dinode_t    *dip;
 276         unsigned int    aformat;
 277
 278         *dipp = NULL;
 279         if (!bp || (flags & BULKSTAT_FG_IGET))
 280                 return 1;
 281         dip = (xfs_dinode_t *)
 282                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 283         /*
 284          * Check the buffer containing the on-disk inode for di_mode == 0.
 285          * This is to prevent xfs_bulkstat from picking up just reclaimed
 286          * inodes that have their in-core state initialized but not flushed
 287          * to disk yet. This is a temporary hack that would require a proper
 288          * fix in the future.
 289          */
 290         if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
 291             !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
 292             !dip->di_core.di_mode)
 293                 return 0;
 294         if (flags & BULKSTAT_FG_QUICK) {
 295                 *dipp = dip;
 296                 return 1;
 297         }
 298         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 299         aformat = dip->di_core.di_aformat;
 300         if ((XFS_DFORK_Q(dip) == 0) ||
 301             (aformat == XFS_DINODE_FMT_LOCAL) ||
 302             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
 303                 *dipp = dip;
 304                 return 1;
 305         }
 306         return 1;
 307 }
 308
 309 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 310
 311 /*
 312  * Return stat information in bulk (by-inode) for the filesystem.
 313  */
 314 int                                     /* error status */
 315 xfs_bulkstat(
 316         xfs_mount_t             *mp,    /* mount point for filesystem */
 317         xfs_ino_t               *lastinop, /* last inode returned */
 318         int                     *ubcountp, /* size of buffer/count returned */
 319         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 320         void                    *private_data,/* private data for formatter */
 321         size_t                  statstruct_size, /* sizeof struct filling */
 322         char                    __user *ubuffer, /* buffer with inode stats */
 323         int                     flags,  /* defined in xfs_itable.h */
 324         int                     *done)  /* 1 if there are more stats to get */
 325 {
 326         xfs_agblock_t           agbno=0;/* allocation group block number */
 327         xfs_buf_t               *agbp;  /* agi header buffer */
 328         xfs_agi_t               *agi;   /* agi header data */
 329         xfs_agino_t             agino;  /* inode # in allocation group */
 330         xfs_agnumber_t          agno;   /* allocation group number */
 331         xfs_daddr_t             bno;    /* inode cluster start daddr */
 332         int                     chunkidx; /* current index into inode chunk */
 333         int                     clustidx; /* current index into inode cluster */
 334         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 335         int                     end_of_ag; /* set if we've seen the ag end */
 336         int                     error;  /* error code */
 337         int                     fmterror;/* bulkstat formatter result */
 338         __int32_t               gcnt;   /* current btree rec's count */
 339         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 340         xfs_agino_t             gino;   /* current btree rec's start inode */
 341         int                     i;      /* loop index */
 342         int                     icount; /* count of inodes good in irbuf */
 343         size_t                  irbsize; /* size of irec buffer in bytes */
 344         xfs_ino_t               ino;    /* inode number (filesystem) */
 345         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 346         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 347         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 348         xfs_ino_t               lastino; /* last inode number returned */
 349         int                     nbcluster; /* # of blocks in a cluster */
 350         int                     nicluster; /* # of inodes in a cluster */
 351         int                     nimask; /* mask for inode clusters */
 352         int                     nirbuf; /* size of irbuf */
 353         int                     rval;   /* return value error code */
 354         int                     tmp;    /* result value from btree calls */
 355         int                     ubcount; /* size of user's buffer */
 356         int                     ubleft; /* bytes left in user's buffer */
 357         char                    __user *ubufp;  /* pointer into user's buffer */
 358         int                     ubelem; /* spaces used in user's buffer */
 359         int                     ubused; /* bytes used by formatter */
 360         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 361         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 362         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 363
 364         /*
 365          * Get the last inode value, see if there's nothing to do.
 366          */
 367         ino = (xfs_ino_t)*lastinop;
 368         lastino = ino;
 369         dip = NULL;
 370         agno = XFS_INO_TO_AGNO(mp, ino);
 371         agino = XFS_INO_TO_AGINO(mp, ino);
 372         if (agno >= mp->m_sb.sb_agcount ||
 373             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 374                 *done = 1;
 375                 *ubcountp = 0;
 376                 return 0;
 377         }
 378         if (!ubcountp || *ubcountp <= 0) {
 379                 return EINVAL;
 380         }
 381         ubcount = *ubcountp; /* statstruct's */
 382         ubleft = ubcount * statstruct_size; /* bytes */
 383         *ubcountp = ubelem = 0;
 384         *done = 0;
 385         fmterror = 0;
 386         ubufp = ubuffer;
 387         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 388                 mp->m_sb.sb_inopblock :
 389                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 390         nimask = ~(nicluster - 1);
 391         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 392         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 393                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 394         nirbuf = irbsize / sizeof(*irbuf);
 395
 396         /*
 397          * Loop over the allocation groups, starting from the last
 398          * inode returned; 0 means start of the allocation group.
 399          */
 400         rval = 0;
 401         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 402                 cond_resched();
 403                 bp = NULL;
 404                 down_read(&mp->m_peraglock);
 405                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 406                 up_read(&mp->m_peraglock);
 407                 if (error) {
 408                         /*
 409                          * Skip this allocation group and go to the next one.
 410                          */
 411                         agno++;
 412                         agino = 0;
 413                         continue;
 414                 }
 415                 agi = XFS_BUF_TO_AGI(agbp);
 416                 /*
 417                  * Allocate and initialize a btree cursor for ialloc btree.
 418                  */
 419                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 420                                                 (xfs_inode_t *)0, 0);
 421                 irbp = irbuf;
 422                 irbufend = irbuf + nirbuf;
 423                 end_of_ag = 0;
 424                 /*
 425                  * If we're returning in the middle of an allocation group,
 426                  * we need to get the remainder of the chunk we're in.
 427                  */
 428                 if (agino > 0) {
 429                         /*
 430                          * Lookup the inode chunk that this inode lives in.
 431                          */
 432                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 433                         if (!error &&   /* no I/O error */
 434                             tmp &&      /* lookup succeeded */
 435                                         /* got the record, should always work */
 436                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 437                                     &gfree, &i)) &&
 438                             i == 1 &&
 439                                         /* this is the right chunk */
 440                             agino < gino + XFS_INODES_PER_CHUNK &&
 441                                         /* lastino was not last in chunk */
 442                             (chunkidx = agino - gino + 1) <
 443                                     XFS_INODES_PER_CHUNK &&
 444                                         /* there are some left allocated */
 445                             XFS_INOBT_MASKN(chunkidx,
 446                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 447                                 /*
 448                                  * Grab the chunk record.  Mark all the
 449                                  * uninteresting inodes (because they're
 450                                  * before our start point) free.
 451                                  */
 452                                 for (i = 0; i < chunkidx; i++) {
 453                                         if (XFS_INOBT_MASK(i) & ~gfree)
 454                                                 gcnt++;
 455                                 }
 456                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 457                                 irbp->ir_startino = gino;
 458                                 irbp->ir_freecount = gcnt;
 459                                 irbp->ir_free = gfree;
 460                                 irbp++;
 461                                 agino = gino + XFS_INODES_PER_CHUNK;
 462                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 463                         } else {
 464                                 /*
 465                                  * If any of those tests failed, bump the
 466                                  * inode number (just in case).
 467                                  */
 468                                 agino++;
 469                                 icount = 0;
 470                         }
 471                         /*
 472                          * In any case, increment to the next record.
 473                          */
 474                         if (!error)
 475                                 error = xfs_inobt_increment(cur, 0, &tmp);
 476                 } else {
 477                         /*
 478                          * Start of ag.  Lookup the first inode chunk.
 479                          */
 480                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 481                         icount = 0;
 482                 }
 483                 /*
 484                  * Loop through inode btree records in this ag,
 485                  * until we run out of inodes or space in the buffer.
 486                  */
 487                 while (irbp < irbufend && icount < ubcount) {
 488                         /*
 489                          * Loop as long as we're unable to read the
 490                          * inode btree.
 491                          */
 492                         while (error) {
 493                                 agino += XFS_INODES_PER_CHUNK;
 494                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 495                                                 be32_to_cpu(agi->agi_length))
 496                                         break;
 497                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 498                                                             &tmp);
 499                                 cond_resched();
 500                         }
 501                         /*
 502                          * If ran off the end of the ag either with an error,
 503                          * or the normal way, set end and stop collecting.
 504                          */
 505                         if (error ||
 506                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 507                                     &gfree, &i)) ||
 508                             i == 0) {
 509                                 end_of_ag = 1;
 510                                 break;
 511                         }
 512                         /*
 513                          * If this chunk has any allocated inodes, save it.
 514                          * Also start read-ahead now for this chunk.
 515                          */
 516                         if (gcnt < XFS_INODES_PER_CHUNK) {
 517                                 /*
 518                                  * Loop over all clusters in the next chunk.
 519                                  * Do a readahead if there are any allocated
 520                                  * inodes in that cluster.
 521                                  */
 522                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 523                                      chunkidx = 0;
 524                                      chunkidx < XFS_INODES_PER_CHUNK;
 525                                      chunkidx += nicluster,
 526                                      agbno += nbcluster) {
 527                                         if (XFS_INOBT_MASKN(chunkidx,
 528                                                             nicluster) & ~gfree)
 529                                                 xfs_btree_reada_bufs(mp, agno,
 530                                                         agbno, nbcluster);
 531                                 }
 532                                 irbp->ir_startino = gino;
 533                                 irbp->ir_freecount = gcnt;
 534                                 irbp->ir_free = gfree;
 535                                 irbp++;
 536                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 537                         }
 538                         /*
 539                          * Set agino to after this chunk and bump the cursor.
 540                          */
 541                         agino = gino + XFS_INODES_PER_CHUNK;
 542                         error = xfs_inobt_increment(cur, 0, &tmp);
 543                         cond_resched();
 544                 }
 545                 /*
 546                  * Drop the btree buffers and the agi buffer.
 547                  * We can't hold any of the locks these represent
 548                  * when calling iget.
 549                  */
 550                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 551                 xfs_buf_relse(agbp);
 552                 /*
 553                  * Now format all the good inodes into the user's buffer.
 554                  */
 555                 irbufend = irbp;
 556                 for (irbp = irbuf;
 557                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 558                         /*
 559                          * Now process this chunk of inodes.
 560                          */
 561                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 562                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 563                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 564                              chunkidx++, clustidx++, agino++) {
 565                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 566                                 /*
 567                                  * Recompute agbno if this is the
 568                                  * first inode of the cluster.
 569                                  *
 570                                  * Careful with clustidx.   There can be
 571                                  * multple clusters per chunk, a single
 572                                  * cluster per chunk or a cluster that has
 573                                  * inodes represented from several different
 574                                  * chunks (if blocksize is large).
 575                                  *
 576                                  * Because of this, the starting clustidx is
 577                                  * initialized to zero in this loop but must
 578                                  * later be reset after reading in the cluster
 579                                  * buffer.
 580                                  */
 581                                 if ((chunkidx & (nicluster - 1)) == 0) {
 582                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 583                                                         irbp->ir_startino) +
 584                                                 ((chunkidx & nimask) >>
 585                                                  mp->m_sb.sb_inopblog);
 586
 587                                         if (flags & (BULKSTAT_FG_QUICK |
 588                                                      BULKSTAT_FG_INLINE)) {
 589                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 590                                                                        agino);
 591                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 592                                                                        agbno);
 593
 594                                                 /*
 595                                                  * Get the inode cluster buffer
 596                                                  */
 597                                                 ASSERT(xfs_inode_zone != NULL);
 598                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 599                                                                       KM_SLEEP);
 600                                                 ip->i_ino = ino;
 601                                                 ip->i_mount = mp;
 602                                                 spin_lock_init(&ip->i_flags_lock);
 603                                                 if (bp)
 604                                                         xfs_buf_relse(bp);
 605                                                 error = xfs_itobp(mp, NULL, ip,
 606                                                                 &dip, &bp, bno,
 607                                                                 XFS_IMAP_BULKSTAT,
 608                                                                 XFS_BUF_LOCK);
 609                                                 if (!error)
 610                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 611                                                 kmem_zone_free(xfs_inode_zone, ip);
 612                                                 if (XFS_TEST_ERROR(error != 0,
 613                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 614                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 615                                                         bp = NULL;
 616                                                         ubleft = 0;
 617                                                         rval = error;
 618                                                         break;
 619                                                 }
 620                                         }
 621                                 }
 622                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 623                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 624                                 /*
 625                                  * Skip if this inode is free.
 626                                  */
 627                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 628                                         lastino = ino;
 629                                         continue;
 630                                 }
 631                                 /*
 632                                  * Count used inodes as free so we can tell
 633                                  * when the chunk is used up.
 634                                  */
 635                                 irbp->ir_freecount++;
 636                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 637                                                              clustidx, &dip)) {
 638                                         lastino = ino;
 639                                         continue;
 640                                 }
 641                                 /*
 642                                  * If we need to do an iget, cannot hold bp.
 643                                  * Drop it, until starting the next cluster.
 644                                  */
 645                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 646                                         if (bp)
 647                                                 xfs_buf_relse(bp);
 648                                         bp = NULL;
 649                                 }
 650
 651                                 /*
 652                                  * Get the inode and fill in a single buffer.
 653                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 654                                  * BULKSTAT_FG_IGET uses igets.
 655                                  * BULKSTAT_FG_INLINE uses dip if we have an
 656                                  * inline attr fork, else igets.
 657                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 658                                  * This is also used to count inodes/blks, etc
 659                                  * in xfs_qm_quotacheck.
 660                                  */
 661                                 ubused = statstruct_size;
 662                                 error = formatter(mp, ino, ubufp,
 663                                                 ubleft, private_data,
 664                                                 bno, &ubused, dip, &fmterror);
 665                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 666                                         if (error && error != ENOENT &&
 667                                                 error != EINVAL) {
 668                                                 ubleft = 0;
 669                                                 rval = error;
 670                                                 break;
 671                                         }
 672                                         lastino = ino;
 673                                         continue;
 674                                 }
 675                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 676                                         ubleft = 0;
 677                                         ASSERT(error);
 678                                         rval = error;
 679                                         break;
 680                                 }
 681                                 if (ubufp)
 682                                         ubufp += ubused;
 683                                 ubleft -= ubused;
 684                                 ubelem++;
 685                                 lastino = ino;
 686                         }
 687
 688                         cond_resched();
 689                 }
 690
 691                 if (bp)
 692                         xfs_buf_relse(bp);
 693
 694                 /*
 695                  * Set up for the next loop iteration.
 696                  */
 697                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 698                         if (end_of_ag) {
 699                                 agno++;
 700                                 agino = 0;
 701                         } else
 702                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 703                 } else
 704                         break;
 705         }
 706         /*
 707          * Done, we're either out of filesystem or space to put the data.
 708          */
 709         kmem_free(irbuf);
 710         *ubcountp = ubelem;
 711         /*
 712          * Found some inodes, return them now and return the error next time.
 713          */
 714         if (ubelem)
 715                 rval = 0;
 716         if (agno >= mp->m_sb.sb_agcount) {
 717                 /*
 718                  * If we ran out of filesystem, mark lastino as off
 719                  * the end of the filesystem, so the next call
 720                  * will return immediately.
 721                  */
 722                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 723                 *done = 1;
 724         } else
 725                 *lastinop = (xfs_ino_t)lastino;
 726
 727         return rval;
 728 }
 729
 730 /*
 731  * Return stat information in bulk (by-inode) for the filesystem.
 732  * Special case for non-sequential one inode bulkstat.
 733  */
 734 int                                     /* error status */
 735 xfs_bulkstat_single(
 736         xfs_mount_t             *mp,    /* mount point for filesystem */
 737         xfs_ino_t               *lastinop, /* inode to return */
 738         char                    __user *buffer, /* buffer with inode stats */
 739         int                     *done)  /* 1 if there are more stats to get */
 740 {
 741         int                     count;  /* count value for bulkstat call */
 742         int                     error;  /* return value */
 743         xfs_ino_t               ino;    /* filesystem inode number */
 744         int                     res;    /* result from bs1 */
 745
 746         /*
 747          * note that requesting valid inode numbers which are not allocated
 748          * to inodes will most likely cause xfs_itobp to generate warning
 749          * messages about bad magic numbers. This is ok. The fact that
 750          * the inode isn't actually an inode is handled by the
 751          * error check below. Done this way to make the usual case faster
 752          * at the expense of the error case.
 753          */
 754
 755         ino = (xfs_ino_t)*lastinop;
 756         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 757                                  NULL, 0, NULL, NULL, &res);
 758         if (error) {
 759                 /*
 760                  * Special case way failed, do it the "long" way
 761                  * to see if that works.
 762                  */
 763                 (*lastinop)--;
 764                 count = 1;
 765                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 766                                 NULL, sizeof(xfs_bstat_t), buffer,
 767                                 BULKSTAT_FG_IGET, done))
 768                         return error;
 769                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 770                         return error == EFSCORRUPTED ?
 771                                 XFS_ERROR(EINVAL) : error;
 772                 else
 773                         return 0;
 774         }
 775         *done = 0;
 776         return 0;
 777 }
 778
 779 int
 780 xfs_inumbers_fmt(
 781         void                    __user *ubuffer, /* buffer to write to */
 782         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 783         long                    count,          /* # of elements to read */
 784         long                    *written)       /* # of bytes written */
 785 {
 786         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 787                 return -EFAULT;
 788         *written = count * sizeof(*buffer);
 789         return 0;
 790 }
 791
 792 /*
 793  * Return inode number table for the filesystem.
 794  */
 795 int                                     /* error status */
 796 xfs_inumbers(
 797         xfs_mount_t     *mp,            /* mount point for filesystem */
 798         xfs_ino_t       *lastino,       /* last inode returned */
 799         int             *count,         /* size of buffer/count returned */
 800         void            __user *ubuffer,/* buffer with inode descriptions */
 801         inumbers_fmt_pf formatter)
 802 {
 803         xfs_buf_t       *agbp;
 804         xfs_agino_t     agino;
 805         xfs_agnumber_t  agno;
 806         int             bcount;
 807         xfs_inogrp_t    *buffer;
 808         int             bufidx;
 809         xfs_btree_cur_t *cur;
 810         int             error;
 811         __int32_t       gcnt;
 812         xfs_inofree_t   gfree;
 813         xfs_agino_t     gino;
 814         int             i;
 815         xfs_ino_t       ino;
 816         int             left;
 817         int             tmp;
 818
 819         ino = (xfs_ino_t)*lastino;
 820         agno = XFS_INO_TO_AGNO(mp, ino);
 821         agino = XFS_INO_TO_AGINO(mp, ino);
 822         left = *count;
 823         *count = 0;
 824         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 825         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 826         error = bufidx = 0;
 827         cur = NULL;
 828         agbp = NULL;
 829         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 830                 if (agbp == NULL) {
 831                         down_read(&mp->m_peraglock);
 832                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 833                         up_read(&mp->m_peraglock);
 834                         if (error) {
 835                                 /*
 836                                  * If we can't read the AGI of this ag,
 837                                  * then just skip to the next one.
 838                                  */
 839                                 ASSERT(cur == NULL);
 840                                 agbp = NULL;
 841                                 agno++;
 842                                 agino = 0;
 843                                 continue;
 844                         }
 845                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 846                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 847                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 848                         if (error) {
 849                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 850                                 cur = NULL;
 851                                 xfs_buf_relse(agbp);
 852                                 agbp = NULL;
 853                                 /*
 854                                  * Move up the last inode in the current
 855                                  * chunk.  The lookup_ge will always get
 856                                  * us the first inode in the next chunk.
 857                                  */
 858                                 agino += XFS_INODES_PER_CHUNK - 1;
 859                                 continue;
 860                         }
 861                 }
 862                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 863                         &i)) ||
 864                     i == 0) {
 865                         xfs_buf_relse(agbp);
 866                         agbp = NULL;
 867                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 868                         cur = NULL;
 869                         agno++;
 870                         agino = 0;
 871                         continue;
 872                 }
 873                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 874                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 875                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 876                 buffer[bufidx].xi_allocmask = ~gfree;
 877                 bufidx++;
 878                 left--;
 879                 if (bufidx == bcount) {
 880                         long written;
 881                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 882                                 error = XFS_ERROR(EFAULT);
 883                                 break;
 884                         }
 885                         ubuffer += written;
 886                         *count += bufidx;
 887                         bufidx = 0;
 888                 }
 889                 if (left) {
 890                         error = xfs_inobt_increment(cur, 0, &tmp);
 891                         if (error) {
 892                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 893                                 cur = NULL;
 894                                 xfs_buf_relse(agbp);
 895                                 agbp = NULL;
 896                                 /*
 897                                  * The agino value has already been bumped.
 898                                  * Just try to skip up to it.
 899                                  */
 900                                 agino += XFS_INODES_PER_CHUNK;
 901                                 continue;
 902                         }
 903                 }
 904         }
 905         if (!error) {
 906                 if (bufidx) {
 907                         long written;
 908                         if (formatter(ubuffer, buffer, bufidx, &written))
 909                                 error = XFS_ERROR(EFAULT);
 910                         else
 911                                 *count += bufidx;
 912                 }
 913                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 914         }
 915         kmem_free(buffer);
 916         if (cur)
 917                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 918                                            XFS_BTREE_NOERROR));
 919         if (agbp)
 920                 xfs_buf_relse(agbp);
 921         return error;
 922 }