SAFE public projects git trees. - safe/jmp/linux-2.6/blob - fs/xfs/xfs_itable.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_error.h"
  40 #include "xfs_btree.h"
  41
  42 STATIC int
  43 xfs_bulkstat_one_iget(
  44         xfs_mount_t     *mp,            /* mount point for filesystem */
  45         xfs_ino_t       ino,            /* inode number to get data for */
  46         xfs_daddr_t     bno,            /* starting bno of inode cluster */
  47         xfs_bstat_t     *buf,           /* return buffer */
  48         int             *stat)          /* BULKSTAT_RV_... */
  49 {
  50         xfs_dinode_core_t *dic;         /* dinode core info pointer */
  51         xfs_inode_t     *ip;            /* incore inode pointer */
  52         bhv_vnode_t     *vp;
  53         int             error;
  54
  55         error = xfs_iget(mp, NULL, ino,
  56                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
  57         if (error) {
  58                 *stat = BULKSTAT_RV_NOTHING;
  59                 return error;
  60         }
  61
  62         ASSERT(ip != NULL);
  63         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  64         if (ip->i_d.di_mode == 0) {
  65                 *stat = BULKSTAT_RV_NOTHING;
  66                 error = XFS_ERROR(ENOENT);
  67                 goto out_iput;
  68         }
  69
  70         vp = XFS_ITOV(ip);
  71         dic = &ip->i_d;
  72
  73         /* xfs_iget returns the following without needing
  74          * further change.
  75          */
  76         buf->bs_nlink = dic->di_nlink;
  77         buf->bs_projid = dic->di_projid;
  78         buf->bs_ino = ino;
  79         buf->bs_mode = dic->di_mode;
  80         buf->bs_uid = dic->di_uid;
  81         buf->bs_gid = dic->di_gid;
  82         buf->bs_size = dic->di_size;
  83         vn_atime_to_bstime(vp, &buf->bs_atime);
  84         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  85         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  86         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  87         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  88         buf->bs_xflags = xfs_ip2xflags(ip);
  89         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  90         buf->bs_extents = dic->di_nextents;
  91         buf->bs_gen = dic->di_gen;
  92         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  93         buf->bs_dmevmask = dic->di_dmevmask;
  94         buf->bs_dmstate = dic->di_dmstate;
  95         buf->bs_aextents = dic->di_anextents;
  96
  97         switch (dic->di_format) {
  98         case XFS_DINODE_FMT_DEV:
  99                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 100                 buf->bs_blksize = BLKDEV_IOSIZE;
 101                 buf->bs_blocks = 0;
 102                 break;
 103         case XFS_DINODE_FMT_LOCAL:
 104         case XFS_DINODE_FMT_UUID:
 105                 buf->bs_rdev = 0;
 106                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 107                 buf->bs_blocks = 0;
 108                 break;
 109         case XFS_DINODE_FMT_EXTENTS:
 110         case XFS_DINODE_FMT_BTREE:
 111                 buf->bs_rdev = 0;
 112                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 113                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 114                 break;
 115         }
 116
 117  out_iput:
 118         xfs_iput(ip, XFS_ILOCK_SHARED);
 119         return error;
 120 }
 121
 122 STATIC int
 123 xfs_bulkstat_one_dinode(
 124         xfs_mount_t     *mp,            /* mount point for filesystem */
 125         xfs_ino_t       ino,            /* inode number to get data for */
 126         xfs_dinode_t    *dip,           /* dinode inode pointer */
 127         xfs_bstat_t     *buf)           /* return buffer */
 128 {
 129         xfs_dinode_core_t *dic;         /* dinode core info pointer */
 130
 131         dic = &dip->di_core;
 132
 133         /*
 134          * The inode format changed when we moved the link count and
 135          * made it 32 bits long.  If this is an old format inode,
 136          * convert it in memory to look like a new one.  If it gets
 137          * flushed to disk we will convert back before flushing or
 138          * logging it.  We zero out the new projid field and the old link
 139          * count field.  We'll handle clearing the pad field (the remains
 140          * of the old uuid field) when we actually convert the inode to
 141          * the new format. We don't change the version number so that we
 142          * can distinguish this from a real new format inode.
 143          */
 144         if (INT_GET(dic->di_version, ARCH_CONVERT) == XFS_DINODE_VERSION_1) {
 145                 buf->bs_nlink = INT_GET(dic->di_onlink, ARCH_CONVERT);
 146                 buf->bs_projid = 0;
 147         } else {
 148                 buf->bs_nlink = INT_GET(dic->di_nlink, ARCH_CONVERT);
 149                 buf->bs_projid = INT_GET(dic->di_projid, ARCH_CONVERT);
 150         }
 151
 152         buf->bs_ino = ino;
 153         buf->bs_mode = INT_GET(dic->di_mode, ARCH_CONVERT);
 154         buf->bs_uid = INT_GET(dic->di_uid, ARCH_CONVERT);
 155         buf->bs_gid = INT_GET(dic->di_gid, ARCH_CONVERT);
 156         buf->bs_size = INT_GET(dic->di_size, ARCH_CONVERT);
 157         buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, ARCH_CONVERT);
 158         buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, ARCH_CONVERT);
 159         buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, ARCH_CONVERT);
 160         buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, ARCH_CONVERT);
 161         buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, ARCH_CONVERT);
 162         buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, ARCH_CONVERT);
 163         buf->bs_xflags = xfs_dic2xflags(dic);
 164         buf->bs_extsize = INT_GET(dic->di_extsize, ARCH_CONVERT) << mp->m_sb.sb_blocklog;
 165         buf->bs_extents = INT_GET(dic->di_nextents, ARCH_CONVERT);
 166         buf->bs_gen = INT_GET(dic->di_gen, ARCH_CONVERT);
 167         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 168         buf->bs_dmevmask = INT_GET(dic->di_dmevmask, ARCH_CONVERT);
 169         buf->bs_dmstate = INT_GET(dic->di_dmstate, ARCH_CONVERT);
 170         buf->bs_aextents = INT_GET(dic->di_anextents, ARCH_CONVERT);
 171
 172         switch (INT_GET(dic->di_format, ARCH_CONVERT)) {
 173         case XFS_DINODE_FMT_DEV:
 174                 buf->bs_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT);
 175                 buf->bs_blksize = BLKDEV_IOSIZE;
 176                 buf->bs_blocks = 0;
 177                 break;
 178         case XFS_DINODE_FMT_LOCAL:
 179         case XFS_DINODE_FMT_UUID:
 180                 buf->bs_rdev = 0;
 181                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 182                 buf->bs_blocks = 0;
 183                 break;
 184         case XFS_DINODE_FMT_EXTENTS:
 185         case XFS_DINODE_FMT_BTREE:
 186                 buf->bs_rdev = 0;
 187                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 188                 buf->bs_blocks = INT_GET(dic->di_nblocks, ARCH_CONVERT);
 189                 break;
 190         }
 191
 192         return 0;
 193 }
 194
 195 /*
 196  * Return stat information for one inode.
 197  * Return 0 if ok, else errno.
 198  */
 199 int                             /* error status */
 200 xfs_bulkstat_one(
 201         xfs_mount_t     *mp,            /* mount point for filesystem */
 202         xfs_ino_t       ino,            /* inode number to get data for */
 203         void            __user *buffer, /* buffer to place output in */
 204         int             ubsize,         /* size of buffer */
 205         void            *private_data,  /* my private data */
 206         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 207         int             *ubused,        /* bytes used by me */
 208         void            *dibuff,        /* on-disk inode buffer */
 209         int             *stat)          /* BULKSTAT_RV_... */
 210 {
 211         xfs_bstat_t     *buf;           /* return buffer */
 212         int             error = 0;      /* error value */
 213         xfs_dinode_t    *dip;           /* dinode inode pointer */
 214
 215         dip = (xfs_dinode_t *)dibuff;
 216
 217         if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
 218             (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 219              (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
 220                 *stat = BULKSTAT_RV_NOTHING;
 221                 return XFS_ERROR(EINVAL);
 222         }
 223         if (ubsize < sizeof(*buf)) {
 224                 *stat = BULKSTAT_RV_NOTHING;
 225                 return XFS_ERROR(ENOMEM);
 226         }
 227
 228         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 229
 230         if (dip == NULL) {
 231                 /* We're not being passed a pointer to a dinode.  This happens
 232                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 233                  */
 234                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 235                 if (error)
 236                         goto out_free;
 237         } else {
 238                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 239         }
 240
 241         if (copy_to_user(buffer, buf, sizeof(*buf)))  {
 242                 *stat = BULKSTAT_RV_NOTHING;
 243                 error =  EFAULT;
 244                 goto out_free;
 245         }
 246
 247         *stat = BULKSTAT_RV_DIDONE;
 248         if (ubused)
 249                 *ubused = sizeof(*buf);
 250
 251  out_free:
 252         kmem_free(buf, sizeof(*buf));
 253         return error;
 254 }
 255
 256 /*
 257  * Test to see whether we can use the ondisk inode directly, based
 258  * on the given bulkstat flags, filling in dipp accordingly.
 259  * Returns zero if the inode is dodgey.
 260  */
 261 STATIC int
 262 xfs_bulkstat_use_dinode(
 263         xfs_mount_t     *mp,
 264         int             flags,
 265         xfs_buf_t       *bp,
 266         int             clustidx,
 267         xfs_dinode_t    **dipp)
 268 {
 269         xfs_dinode_t    *dip;
 270         unsigned int    aformat;
 271
 272         *dipp = NULL;
 273         if (!bp || (flags & BULKSTAT_FG_IGET))
 274                 return 1;
 275         dip = (xfs_dinode_t *)
 276                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 277         if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT) != XFS_DINODE_MAGIC ||
 278             !XFS_DINODE_GOOD_VERSION(
 279                         INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
 280                 return 0;
 281         if (flags & BULKSTAT_FG_QUICK) {
 282                 *dipp = dip;
 283                 return 1;
 284         }
 285         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 286         aformat = INT_GET(dip->di_core.di_aformat, ARCH_CONVERT);
 287         if ((XFS_CFORK_Q(&dip->di_core) == 0) ||
 288             (aformat == XFS_DINODE_FMT_LOCAL) ||
 289             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
 290                 *dipp = dip;
 291                 return 1;
 292         }
 293         return 1;
 294 }
 295
 296 /*
 297  * Return stat information in bulk (by-inode) for the filesystem.
 298  */
 299 int                                     /* error status */
 300 xfs_bulkstat(
 301         xfs_mount_t             *mp,    /* mount point for filesystem */
 302         xfs_ino_t               *lastinop, /* last inode returned */
 303         int                     *ubcountp, /* size of buffer/count returned */
 304         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 305         void                    *private_data,/* private data for formatter */
 306         size_t                  statstruct_size, /* sizeof struct filling */
 307         char                    __user *ubuffer, /* buffer with inode stats */
 308         int                     flags,  /* defined in xfs_itable.h */
 309         int                     *done)  /* 1 if there are more stats to get */
 310 {
 311         xfs_agblock_t           agbno=0;/* allocation group block number */
 312         xfs_buf_t               *agbp;  /* agi header buffer */
 313         xfs_agi_t               *agi;   /* agi header data */
 314         xfs_agino_t             agino;  /* inode # in allocation group */
 315         xfs_agnumber_t          agno;   /* allocation group number */
 316         xfs_daddr_t             bno;    /* inode cluster start daddr */
 317         int                     chunkidx; /* current index into inode chunk */
 318         int                     clustidx; /* current index into inode cluster */
 319         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 320         int                     end_of_ag; /* set if we've seen the ag end */
 321         int                     error;  /* error code */
 322         int                     fmterror;/* bulkstat formatter result */
 323         __int32_t               gcnt;   /* current btree rec's count */
 324         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 325         xfs_agino_t             gino;   /* current btree rec's start inode */
 326         int                     i;      /* loop index */
 327         int                     icount; /* count of inodes good in irbuf */
 328         int                     irbsize; /* size of irec buffer in bytes */
 329         unsigned int            kmflags; /* flags for allocating irec buffer */
 330         xfs_ino_t               ino;    /* inode number (filesystem) */
 331         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 332         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 333         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 334         xfs_ino_t               lastino=0; /* last inode number returned */
 335         int                     nbcluster; /* # of blocks in a cluster */
 336         int                     nicluster; /* # of inodes in a cluster */
 337         int                     nimask; /* mask for inode clusters */
 338         int                     nirbuf; /* size of irbuf */
 339         int                     rval;   /* return value error code */
 340         int                     tmp;    /* result value from btree calls */
 341         int                     ubcount; /* size of user's buffer */
 342         int                     ubleft; /* bytes left in user's buffer */
 343         char                    __user *ubufp;  /* pointer into user's buffer */
 344         int                     ubelem; /* spaces used in user's buffer */
 345         int                     ubused; /* bytes used by formatter */
 346         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 347         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 348         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 349
 350         /*
 351          * Get the last inode value, see if there's nothing to do.
 352          */
 353         ino = (xfs_ino_t)*lastinop;
 354         dip = NULL;
 355         agno = XFS_INO_TO_AGNO(mp, ino);
 356         agino = XFS_INO_TO_AGINO(mp, ino);
 357         if (agno >= mp->m_sb.sb_agcount ||
 358             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 359                 *done = 1;
 360                 *ubcountp = 0;
 361                 return 0;
 362         }
 363         ubcount = *ubcountp; /* statstruct's */
 364         ubleft = ubcount * statstruct_size; /* bytes */
 365         *ubcountp = ubelem = 0;
 366         *done = 0;
 367         fmterror = 0;
 368         ubufp = ubuffer;
 369         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 370                 mp->m_sb.sb_inopblock :
 371                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 372         nimask = ~(nicluster - 1);
 373         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 374         /*
 375          * Allocate a local buffer for inode cluster btree records.
 376          * This caps our maximum readahead window (so don't be stingy)
 377          * but we must handle the case where we can't get a contiguous
 378          * multi-page buffer, so we drop back toward pagesize; the end
 379          * case we ensure succeeds, via appropriate allocation flags.
 380          */
 381         irbsize = NBPP * 4;
 382         kmflags = KM_SLEEP | KM_MAYFAIL;
 383         while (!(irbuf = kmem_alloc(irbsize, kmflags))) {
 384                 if ((irbsize >>= 1) <= NBPP)
 385                         kmflags = KM_SLEEP;
 386         }
 387         nirbuf = irbsize / sizeof(*irbuf);
 388
 389         /*
 390          * Loop over the allocation groups, starting from the last
 391          * inode returned; 0 means start of the allocation group.
 392          */
 393         rval = 0;
 394         while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
 395                 bp = NULL;
 396                 down_read(&mp->m_peraglock);
 397                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 398                 up_read(&mp->m_peraglock);
 399                 if (error) {
 400                         /*
 401                          * Skip this allocation group and go to the next one.
 402                          */
 403                         agno++;
 404                         agino = 0;
 405                         continue;
 406                 }
 407                 agi = XFS_BUF_TO_AGI(agbp);
 408                 /*
 409                  * Allocate and initialize a btree cursor for ialloc btree.
 410                  */
 411                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 412                                                 (xfs_inode_t *)0, 0);
 413                 irbp = irbuf;
 414                 irbufend = irbuf + nirbuf;
 415                 end_of_ag = 0;
 416                 /*
 417                  * If we're returning in the middle of an allocation group,
 418                  * we need to get the remainder of the chunk we're in.
 419                  */
 420                 if (agino > 0) {
 421                         /*
 422                          * Lookup the inode chunk that this inode lives in.
 423                          */
 424                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 425                         if (!error &&   /* no I/O error */
 426                             tmp &&      /* lookup succeeded */
 427                                         /* got the record, should always work */
 428                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 429                                     &gfree, &i)) &&
 430                             i == 1 &&
 431                                         /* this is the right chunk */
 432                             agino < gino + XFS_INODES_PER_CHUNK &&
 433                                         /* lastino was not last in chunk */
 434                             (chunkidx = agino - gino + 1) <
 435                                     XFS_INODES_PER_CHUNK &&
 436                                         /* there are some left allocated */
 437                             XFS_INOBT_MASKN(chunkidx,
 438                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 439                                 /*
 440                                  * Grab the chunk record.  Mark all the
 441                                  * uninteresting inodes (because they're
 442                                  * before our start point) free.
 443                                  */
 444                                 for (i = 0; i < chunkidx; i++) {
 445                                         if (XFS_INOBT_MASK(i) & ~gfree)
 446                                                 gcnt++;
 447                                 }
 448                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 449                                 irbp->ir_startino = gino;
 450                                 irbp->ir_freecount = gcnt;
 451                                 irbp->ir_free = gfree;
 452                                 irbp++;
 453                                 agino = gino + XFS_INODES_PER_CHUNK;
 454                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 455                         } else {
 456                                 /*
 457                                  * If any of those tests failed, bump the
 458                                  * inode number (just in case).
 459                                  */
 460                                 agino++;
 461                                 icount = 0;
 462                         }
 463                         /*
 464                          * In any case, increment to the next record.
 465                          */
 466                         if (!error)
 467                                 error = xfs_inobt_increment(cur, 0, &tmp);
 468                 } else {
 469                         /*
 470                          * Start of ag.  Lookup the first inode chunk.
 471                          */
 472                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 473                         icount = 0;
 474                 }
 475                 /*
 476                  * Loop through inode btree records in this ag,
 477                  * until we run out of inodes or space in the buffer.
 478                  */
 479                 while (irbp < irbufend && icount < ubcount) {
 480                         /*
 481                          * Loop as long as we're unable to read the
 482                          * inode btree.
 483                          */
 484                         while (error) {
 485                                 agino += XFS_INODES_PER_CHUNK;
 486                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 487                                                 be32_to_cpu(agi->agi_length))
 488                                         break;
 489                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 490                                                             &tmp);
 491                         }
 492                         /*
 493                          * If ran off the end of the ag either with an error,
 494                          * or the normal way, set end and stop collecting.
 495                          */
 496                         if (error ||
 497                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 498                                     &gfree, &i)) ||
 499                             i == 0) {
 500                                 end_of_ag = 1;
 501                                 break;
 502                         }
 503                         /*
 504                          * If this chunk has any allocated inodes, save it.
 505                          * Also start read-ahead now for this chunk.
 506                          */
 507                         if (gcnt < XFS_INODES_PER_CHUNK) {
 508                                 /*
 509                                  * Loop over all clusters in the next chunk.
 510                                  * Do a readahead if there are any allocated
 511                                  * inodes in that cluster.
 512                                  */
 513                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 514                                      chunkidx = 0;
 515                                      chunkidx < XFS_INODES_PER_CHUNK;
 516                                      chunkidx += nicluster,
 517                                      agbno += nbcluster) {
 518                                         if (XFS_INOBT_MASKN(chunkidx,
 519                                                             nicluster) & ~gfree)
 520                                                 xfs_btree_reada_bufs(mp, agno,
 521                                                         agbno, nbcluster);
 522                                 }
 523                                 irbp->ir_startino = gino;
 524                                 irbp->ir_freecount = gcnt;
 525                                 irbp->ir_free = gfree;
 526                                 irbp++;
 527                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 528                         }
 529                         /*
 530                          * Set agino to after this chunk and bump the cursor.
 531                          */
 532                         agino = gino + XFS_INODES_PER_CHUNK;
 533                         error = xfs_inobt_increment(cur, 0, &tmp);
 534                 }
 535                 /*
 536                  * Drop the btree buffers and the agi buffer.
 537                  * We can't hold any of the locks these represent
 538                  * when calling iget.
 539                  */
 540                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 541                 xfs_buf_relse(agbp);
 542                 /*
 543                  * Now format all the good inodes into the user's buffer.
 544                  */
 545                 irbufend = irbp;
 546                 for (irbp = irbuf;
 547                      irbp < irbufend && ubleft >= statstruct_size; irbp++) {
 548                         /*
 549                          * Now process this chunk of inodes.
 550                          */
 551                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 552                              ubleft > 0 &&
 553                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 554                              chunkidx++, clustidx++, agino++) {
 555                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 556                                 /*
 557                                  * Recompute agbno if this is the
 558                                  * first inode of the cluster.
 559                                  *
 560                                  * Careful with clustidx.   There can be
 561                                  * multple clusters per chunk, a single
 562                                  * cluster per chunk or a cluster that has
 563                                  * inodes represented from several different
 564                                  * chunks (if blocksize is large).
 565                                  *
 566                                  * Because of this, the starting clustidx is
 567                                  * initialized to zero in this loop but must
 568                                  * later be reset after reading in the cluster
 569                                  * buffer.
 570                                  */
 571                                 if ((chunkidx & (nicluster - 1)) == 0) {
 572                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 573                                                         irbp->ir_startino) +
 574                                                 ((chunkidx & nimask) >>
 575                                                  mp->m_sb.sb_inopblog);
 576
 577                                         if (flags & (BULKSTAT_FG_QUICK |
 578                                                      BULKSTAT_FG_INLINE)) {
 579                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 580                                                                        agino);
 581                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 582                                                                        agbno);
 583
 584                                                 /*
 585                                                  * Get the inode cluster buffer
 586                                                  */
 587                                                 ASSERT(xfs_inode_zone != NULL);
 588                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 589                                                                       KM_SLEEP);
 590                                                 ip->i_ino = ino;
 591                                                 ip->i_mount = mp;
 592                                                 if (bp)
 593                                                         xfs_buf_relse(bp);
 594                                                 error = xfs_itobp(mp, NULL, ip,
 595                                                                 &dip, &bp, bno,
 596                                                                 XFS_IMAP_BULKSTAT);
 597                                                 if (!error)
 598                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 599                                                 kmem_zone_free(xfs_inode_zone, ip);
 600                                                 if (XFS_TEST_ERROR(error != 0,
 601                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 602                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 603                                                         bp = NULL;
 604                                                         ubleft = 0;
 605                                                         rval = error;
 606                                                         break;
 607                                                 }
 608                                         }
 609                                 }
 610                                 /*
 611                                  * Skip if this inode is free.
 612                                  */
 613                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free)
 614                                         continue;
 615                                 /*
 616                                  * Count used inodes as free so we can tell
 617                                  * when the chunk is used up.
 618                                  */
 619                                 irbp->ir_freecount++;
 620                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 621                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 622                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 623                                                              clustidx, &dip))
 624                                         continue;
 625                                 /*
 626                                  * If we need to do an iget, cannot hold bp.
 627                                  * Drop it, until starting the next cluster.
 628                                  */
 629                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 630                                         if (bp)
 631                                                 xfs_buf_relse(bp);
 632                                         bp = NULL;
 633                                 }
 634
 635                                 /*
 636                                  * Get the inode and fill in a single buffer.
 637                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 638                                  * BULKSTAT_FG_IGET uses igets.
 639                                  * BULKSTAT_FG_INLINE uses dip if we have an
 640                                  * inline attr fork, else igets.
 641                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 642                                  * This is also used to count inodes/blks, etc
 643                                  * in xfs_qm_quotacheck.
 644                                  */
 645                                 ubused = statstruct_size;
 646                                 error = formatter(mp, ino, ubufp,
 647                                                 ubleft, private_data,
 648                                                 bno, &ubused, dip, &fmterror);
 649                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 650                                         if (error == ENOMEM)
 651                                                 ubleft = 0;
 652                                         continue;
 653                                 }
 654                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 655                                         ubleft = 0;
 656                                         ASSERT(error);
 657                                         rval = error;
 658                                         break;
 659                                 }
 660                                 if (ubufp)
 661                                         ubufp += ubused;
 662                                 ubleft -= ubused;
 663                                 ubelem++;
 664                                 lastino = ino;
 665                         }
 666                 }
 667
 668                 if (bp)
 669                         xfs_buf_relse(bp);
 670
 671                 /*
 672                  * Set up for the next loop iteration.
 673                  */
 674                 if (ubleft > 0) {
 675                         if (end_of_ag) {
 676                                 agno++;
 677                                 agino = 0;
 678                         } else
 679                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 680                 } else
 681                         break;
 682         }
 683         /*
 684          * Done, we're either out of filesystem or space to put the data.
 685          */
 686         kmem_free(irbuf, irbsize);
 687         *ubcountp = ubelem;
 688         if (agno >= mp->m_sb.sb_agcount) {
 689                 /*
 690                  * If we ran out of filesystem, mark lastino as off
 691                  * the end of the filesystem, so the next call
 692                  * will return immediately.
 693                  */
 694                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 695                 *done = 1;
 696         } else
 697                 *lastinop = (xfs_ino_t)lastino;
 698
 699         return rval;
 700 }
 701
 702 /*
 703  * Return stat information in bulk (by-inode) for the filesystem.
 704  * Special case for non-sequential one inode bulkstat.
 705  */
 706 int                                     /* error status */
 707 xfs_bulkstat_single(
 708         xfs_mount_t             *mp,    /* mount point for filesystem */
 709         xfs_ino_t               *lastinop, /* inode to return */
 710         char                    __user *buffer, /* buffer with inode stats */
 711         int                     *done)  /* 1 if there are more stats to get */
 712 {
 713         int                     count;  /* count value for bulkstat call */
 714         int                     error;  /* return value */
 715         xfs_ino_t               ino;    /* filesystem inode number */
 716         int                     res;    /* result from bs1 */
 717
 718         /*
 719          * note that requesting valid inode numbers which are not allocated
 720          * to inodes will most likely cause xfs_itobp to generate warning
 721          * messages about bad magic numbers. This is ok. The fact that
 722          * the inode isn't actually an inode is handled by the
 723          * error check below. Done this way to make the usual case faster
 724          * at the expense of the error case.
 725          */
 726
 727         ino = (xfs_ino_t)*lastinop;
 728         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 729                                  NULL, 0, NULL, NULL, &res);
 730         if (error) {
 731                 /*
 732                  * Special case way failed, do it the "long" way
 733                  * to see if that works.
 734                  */
 735                 (*lastinop)--;
 736                 count = 1;
 737                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 738                                 NULL, sizeof(xfs_bstat_t), buffer,
 739                                 BULKSTAT_FG_IGET, done))
 740                         return error;
 741                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 742                         return error == EFSCORRUPTED ?
 743                                 XFS_ERROR(EINVAL) : error;
 744                 else
 745                         return 0;
 746         }
 747         *done = 0;
 748         return 0;
 749 }
 750
 751 /*
 752  * Return inode number table for the filesystem.
 753  */
 754 int                                     /* error status */
 755 xfs_inumbers(
 756         xfs_mount_t     *mp,            /* mount point for filesystem */
 757         xfs_ino_t       *lastino,       /* last inode returned */
 758         int             *count,         /* size of buffer/count returned */
 759         xfs_inogrp_t    __user *ubuffer)/* buffer with inode descriptions */
 760 {
 761         xfs_buf_t       *agbp;
 762         xfs_agino_t     agino;
 763         xfs_agnumber_t  agno;
 764         int             bcount;
 765         xfs_inogrp_t    *buffer;
 766         int             bufidx;
 767         xfs_btree_cur_t *cur;
 768         int             error;
 769         __int32_t       gcnt;
 770         xfs_inofree_t   gfree;
 771         xfs_agino_t     gino;
 772         int             i;
 773         xfs_ino_t       ino;
 774         int             left;
 775         int             tmp;
 776
 777         ino = (xfs_ino_t)*lastino;
 778         agno = XFS_INO_TO_AGNO(mp, ino);
 779         agino = XFS_INO_TO_AGINO(mp, ino);
 780         left = *count;
 781         *count = 0;
 782         bcount = MIN(left, (int)(NBPP / sizeof(*buffer)));
 783         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 784         error = bufidx = 0;
 785         cur = NULL;
 786         agbp = NULL;
 787         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 788                 if (agbp == NULL) {
 789                         down_read(&mp->m_peraglock);
 790                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 791                         up_read(&mp->m_peraglock);
 792                         if (error) {
 793                                 /*
 794                                  * If we can't read the AGI of this ag,
 795                                  * then just skip to the next one.
 796                                  */
 797                                 ASSERT(cur == NULL);
 798                                 agbp = NULL;
 799                                 agno++;
 800                                 agino = 0;
 801                                 continue;
 802                         }
 803                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 804                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 805                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 806                         if (error) {
 807                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 808                                 cur = NULL;
 809                                 xfs_buf_relse(agbp);
 810                                 agbp = NULL;
 811                                 /*
 812                                  * Move up the the last inode in the current
 813                                  * chunk.  The lookup_ge will always get
 814                                  * us the first inode in the next chunk.
 815                                  */
 816                                 agino += XFS_INODES_PER_CHUNK - 1;
 817                                 continue;
 818                         }
 819                 }
 820                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 821                         &i)) ||
 822                     i == 0) {
 823                         xfs_buf_relse(agbp);
 824                         agbp = NULL;
 825                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 826                         cur = NULL;
 827                         agno++;
 828                         agino = 0;
 829                         continue;
 830                 }
 831                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 832                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 833                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 834                 buffer[bufidx].xi_allocmask = ~gfree;
 835                 bufidx++;
 836                 left--;
 837                 if (bufidx == bcount) {
 838                         if (copy_to_user(ubuffer, buffer,
 839                                         bufidx * sizeof(*buffer))) {
 840                                 error = XFS_ERROR(EFAULT);
 841                                 break;
 842                         }
 843                         ubuffer += bufidx;
 844                         *count += bufidx;
 845                         bufidx = 0;
 846                 }
 847                 if (left) {
 848                         error = xfs_inobt_increment(cur, 0, &tmp);
 849                         if (error) {
 850                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 851                                 cur = NULL;
 852                                 xfs_buf_relse(agbp);
 853                                 agbp = NULL;
 854                                 /*
 855                                  * The agino value has already been bumped.
 856                                  * Just try to skip up to it.
 857                                  */
 858                                 agino += XFS_INODES_PER_CHUNK;
 859                                 continue;
 860                         }
 861                 }
 862         }
 863         if (!error) {
 864                 if (bufidx) {
 865                         if (copy_to_user(ubuffer, buffer,
 866                                         bufidx * sizeof(*buffer)))
 867                                 error = XFS_ERROR(EFAULT);
 868                         else
 869                                 *count += bufidx;
 870                 }
 871                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 872         }
 873         kmem_free(buffer, bcount * sizeof(*buffer));
 874         if (cur)
 875                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 876                                            XFS_BTREE_NOERROR));
 877         if (agbp)
 878                 xfs_buf_relse(agbp);
 879         return error;
 880 }