git.oblomov.eu Git - 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 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         bhv_vnode_t     *vp;
  63         int             error;
  64
  65         error = xfs_iget(mp, NULL, ino,
  66                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
  67         if (error) {
  68                 *stat = BULKSTAT_RV_NOTHING;
  69                 return error;
  70         }
  71
  72         ASSERT(ip != NULL);
  73         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  74         if (ip->i_d.di_mode == 0) {
  75                 *stat = BULKSTAT_RV_NOTHING;
  76                 error = XFS_ERROR(ENOENT);
  77                 goto out_iput;
  78         }
  79
  80         vp = XFS_ITOV(ip);
  81         dic = &ip->i_d;
  82
  83         /* xfs_iget returns the following without needing
  84          * further change.
  85          */
  86         buf->bs_nlink = dic->di_nlink;
  87         buf->bs_projid = dic->di_projid;
  88         buf->bs_ino = ino;
  89         buf->bs_mode = dic->di_mode;
  90         buf->bs_uid = dic->di_uid;
  91         buf->bs_gid = dic->di_gid;
  92         buf->bs_size = dic->di_size;
  93         vn_atime_to_bstime(vp, &buf->bs_atime);
  94         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  95         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  96         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  97         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  98         buf->bs_xflags = xfs_ip2xflags(ip);
  99         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
 100         buf->bs_extents = dic->di_nextents;
 101         buf->bs_gen = dic->di_gen;
 102         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 103         buf->bs_dmevmask = dic->di_dmevmask;
 104         buf->bs_dmstate = dic->di_dmstate;
 105         buf->bs_aextents = dic->di_anextents;
 106
 107         switch (dic->di_format) {
 108         case XFS_DINODE_FMT_DEV:
 109                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 110                 buf->bs_blksize = BLKDEV_IOSIZE;
 111                 buf->bs_blocks = 0;
 112                 break;
 113         case XFS_DINODE_FMT_LOCAL:
 114         case XFS_DINODE_FMT_UUID:
 115                 buf->bs_rdev = 0;
 116                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 117                 buf->bs_blocks = 0;
 118                 break;
 119         case XFS_DINODE_FMT_EXTENTS:
 120         case XFS_DINODE_FMT_BTREE:
 121                 buf->bs_rdev = 0;
 122                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 123                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 124                 break;
 125         }
 126
 127  out_iput:
 128         xfs_iput(ip, XFS_ILOCK_SHARED);
 129         return error;
 130 }
 131
 132 STATIC int
 133 xfs_bulkstat_one_dinode(
 134         xfs_mount_t     *mp,            /* mount point for filesystem */
 135         xfs_ino_t       ino,            /* inode number to get data for */
 136         xfs_dinode_t    *dip,           /* dinode inode pointer */
 137         xfs_bstat_t     *buf)           /* return buffer */
 138 {
 139         xfs_dinode_core_t *dic;         /* dinode core info pointer */
 140
 141         dic = &dip->di_core;
 142
 143         /*
 144          * The inode format changed when we moved the link count and
 145          * made it 32 bits long.  If this is an old format inode,
 146          * convert it in memory to look like a new one.  If it gets
 147          * flushed to disk we will convert back before flushing or
 148          * logging it.  We zero out the new projid field and the old link
 149          * count field.  We'll handle clearing the pad field (the remains
 150          * of the old uuid field) when we actually convert the inode to
 151          * the new format. We don't change the version number so that we
 152          * can distinguish this from a real new format inode.
 153          */
 154         if (dic->di_version == XFS_DINODE_VERSION_1) {
 155                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 156                 buf->bs_projid = 0;
 157         } else {
 158                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 159                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 160         }
 161
 162         buf->bs_ino = ino;
 163         buf->bs_mode = be16_to_cpu(dic->di_mode);
 164         buf->bs_uid = be32_to_cpu(dic->di_uid);
 165         buf->bs_gid = be32_to_cpu(dic->di_gid);
 166         buf->bs_size = be64_to_cpu(dic->di_size);
 167         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 168         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 169         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 170         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 171         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 172         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 173         buf->bs_xflags = xfs_dic2xflags(dip);
 174         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 175         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 176         buf->bs_gen = be32_to_cpu(dic->di_gen);
 177         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 178         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 179         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 180         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 181
 182         switch (dic->di_format) {
 183         case XFS_DINODE_FMT_DEV:
 184                 buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
 185                 buf->bs_blksize = BLKDEV_IOSIZE;
 186                 buf->bs_blocks = 0;
 187                 break;
 188         case XFS_DINODE_FMT_LOCAL:
 189         case XFS_DINODE_FMT_UUID:
 190                 buf->bs_rdev = 0;
 191                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 192                 buf->bs_blocks = 0;
 193                 break;
 194         case XFS_DINODE_FMT_EXTENTS:
 195         case XFS_DINODE_FMT_BTREE:
 196                 buf->bs_rdev = 0;
 197                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 198                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
 199                 break;
 200         }
 201
 202         return 0;
 203 }
 204
 205 STATIC int
 206 xfs_bulkstat_one_fmt(
 207         void                    __user *ubuffer,
 208         const xfs_bstat_t       *buffer)
 209 {
 210         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 211                 return -EFAULT;
 212         return sizeof(*buffer);
 213 }
 214
 215 /*
 216  * Return stat information for one inode.
 217  * Return 0 if ok, else errno.
 218  */
 219 int                             /* error status */
 220 xfs_bulkstat_one(
 221         xfs_mount_t     *mp,            /* mount point for filesystem */
 222         xfs_ino_t       ino,            /* inode number to get data for */
 223         void            __user *buffer, /* buffer to place output in */
 224         int             ubsize,         /* size of buffer */
 225         void            *private_data,  /* my private data */
 226         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 227         int             *ubused,        /* bytes used by me */
 228         void            *dibuff,        /* on-disk inode buffer */
 229         int             *stat)          /* BULKSTAT_RV_... */
 230 {
 231         xfs_bstat_t     *buf;           /* return buffer */
 232         int             error = 0;      /* error value */
 233         xfs_dinode_t    *dip;           /* dinode inode pointer */
 234         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
 235
 236         dip = (xfs_dinode_t *)dibuff;
 237         *stat = BULKSTAT_RV_NOTHING;
 238
 239         if (!buffer || xfs_internal_inum(mp, ino))
 240                 return XFS_ERROR(EINVAL);
 241         if (ubsize < sizeof(*buf))
 242                 return XFS_ERROR(ENOMEM);
 243
 244         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 245
 246         if (dip == NULL) {
 247                 /* We're not being passed a pointer to a dinode.  This happens
 248                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 249                  */
 250                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 251                 if (error)
 252                         goto out_free;
 253         } else {
 254                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 255         }
 256
 257         error = formatter(buffer, buf);
 258         if (error < 0)  {
 259                 error = EFAULT;
 260                 goto out_free;
 261         }
 262
 263         *stat = BULKSTAT_RV_DIDONE;
 264         if (ubused)
 265                 *ubused = error;
 266
 267  out_free:
 268         kmem_free(buf, sizeof(*buf));
 269         return error;
 270 }
 271
 272 /*
 273  * Test to see whether we can use the ondisk inode directly, based
 274  * on the given bulkstat flags, filling in dipp accordingly.
 275  * Returns zero if the inode is dodgey.
 276  */
 277 STATIC int
 278 xfs_bulkstat_use_dinode(
 279         xfs_mount_t     *mp,
 280         int             flags,
 281         xfs_buf_t       *bp,
 282         int             clustidx,
 283         xfs_dinode_t    **dipp)
 284 {
 285         xfs_dinode_t    *dip;
 286         unsigned int    aformat;
 287
 288         *dipp = NULL;
 289         if (!bp || (flags & BULKSTAT_FG_IGET))
 290                 return 1;
 291         dip = (xfs_dinode_t *)
 292                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 293         /*
 294          * Check the buffer containing the on-disk inode for di_mode == 0.
 295          * This is to prevent xfs_bulkstat from picking up just reclaimed
 296          * inodes that have their in-core state initialized but not flushed
 297          * to disk yet. This is a temporary hack that would require a proper
 298          * fix in the future.
 299          */
 300         if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
 301             !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
 302             !dip->di_core.di_mode)
 303                 return 0;
 304         if (flags & BULKSTAT_FG_QUICK) {
 305                 *dipp = dip;
 306                 return 1;
 307         }
 308         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 309         aformat = dip->di_core.di_aformat;
 310         if ((XFS_DFORK_Q(dip) == 0) ||
 311             (aformat == XFS_DINODE_FMT_LOCAL) ||
 312             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
 313                 *dipp = dip;
 314                 return 1;
 315         }
 316         return 1;
 317 }
 318
 319 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 320
 321 /*
 322  * Return stat information in bulk (by-inode) for the filesystem.
 323  */
 324 int                                     /* error status */
 325 xfs_bulkstat(
 326         xfs_mount_t             *mp,    /* mount point for filesystem */
 327         xfs_ino_t               *lastinop, /* last inode returned */
 328         int                     *ubcountp, /* size of buffer/count returned */
 329         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 330         void                    *private_data,/* private data for formatter */
 331         size_t                  statstruct_size, /* sizeof struct filling */
 332         char                    __user *ubuffer, /* buffer with inode stats */
 333         int                     flags,  /* defined in xfs_itable.h */
 334         int                     *done)  /* 1 if there are more stats to get */
 335 {
 336         xfs_agblock_t           agbno=0;/* allocation group block number */
 337         xfs_buf_t               *agbp;  /* agi header buffer */
 338         xfs_agi_t               *agi;   /* agi header data */
 339         xfs_agino_t             agino;  /* inode # in allocation group */
 340         xfs_agnumber_t          agno;   /* allocation group number */
 341         xfs_daddr_t             bno;    /* inode cluster start daddr */
 342         int                     chunkidx; /* current index into inode chunk */
 343         int                     clustidx; /* current index into inode cluster */
 344         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 345         int                     end_of_ag; /* set if we've seen the ag end */
 346         int                     error;  /* error code */
 347         int                     fmterror;/* bulkstat formatter result */
 348         __int32_t               gcnt;   /* current btree rec's count */
 349         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 350         xfs_agino_t             gino;   /* current btree rec's start inode */
 351         int                     i;      /* loop index */
 352         int                     icount; /* count of inodes good in irbuf */
 353         size_t                  irbsize; /* size of irec buffer in bytes */
 354         xfs_ino_t               ino;    /* inode number (filesystem) */
 355         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 356         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 357         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 358         xfs_ino_t               lastino; /* last inode number returned */
 359         int                     nbcluster; /* # of blocks in a cluster */
 360         int                     nicluster; /* # of inodes in a cluster */
 361         int                     nimask; /* mask for inode clusters */
 362         int                     nirbuf; /* size of irbuf */
 363         int                     rval;   /* return value error code */
 364         int                     tmp;    /* result value from btree calls */
 365         int                     ubcount; /* size of user's buffer */
 366         int                     ubleft; /* bytes left in user's buffer */
 367         char                    __user *ubufp;  /* pointer into user's buffer */
 368         int                     ubelem; /* spaces used in user's buffer */
 369         int                     ubused; /* bytes used by formatter */
 370         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 371         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 372         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 373
 374         /*
 375          * Get the last inode value, see if there's nothing to do.
 376          */
 377         ino = (xfs_ino_t)*lastinop;
 378         lastino = ino;
 379         dip = NULL;
 380         agno = XFS_INO_TO_AGNO(mp, ino);
 381         agino = XFS_INO_TO_AGINO(mp, ino);
 382         if (agno >= mp->m_sb.sb_agcount ||
 383             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 384                 *done = 1;
 385                 *ubcountp = 0;
 386                 return 0;
 387         }
 388         if (!ubcountp || *ubcountp <= 0) {
 389                 return EINVAL;
 390         }
 391         ubcount = *ubcountp; /* statstruct's */
 392         ubleft = ubcount * statstruct_size; /* bytes */
 393         *ubcountp = ubelem = 0;
 394         *done = 0;
 395         fmterror = 0;
 396         ubufp = ubuffer;
 397         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 398                 mp->m_sb.sb_inopblock :
 399                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 400         nimask = ~(nicluster - 1);
 401         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 402         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 403                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 404         nirbuf = irbsize / sizeof(*irbuf);
 405
 406         /*
 407          * Loop over the allocation groups, starting from the last
 408          * inode returned; 0 means start of the allocation group.
 409          */
 410         rval = 0;
 411         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 412                 cond_resched();
 413                 bp = NULL;
 414                 down_read(&mp->m_peraglock);
 415                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 416                 up_read(&mp->m_peraglock);
 417                 if (error) {
 418                         /*
 419                          * Skip this allocation group and go to the next one.
 420                          */
 421                         agno++;
 422                         agino = 0;
 423                         continue;
 424                 }
 425                 agi = XFS_BUF_TO_AGI(agbp);
 426                 /*
 427                  * Allocate and initialize a btree cursor for ialloc btree.
 428                  */
 429                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 430                                                 (xfs_inode_t *)0, 0);
 431                 irbp = irbuf;
 432                 irbufend = irbuf + nirbuf;
 433                 end_of_ag = 0;
 434                 /*
 435                  * If we're returning in the middle of an allocation group,
 436                  * we need to get the remainder of the chunk we're in.
 437                  */
 438                 if (agino > 0) {
 439                         /*
 440                          * Lookup the inode chunk that this inode lives in.
 441                          */
 442                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 443                         if (!error &&   /* no I/O error */
 444                             tmp &&      /* lookup succeeded */
 445                                         /* got the record, should always work */
 446                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 447                                     &gfree, &i)) &&
 448                             i == 1 &&
 449                                         /* this is the right chunk */
 450                             agino < gino + XFS_INODES_PER_CHUNK &&
 451                                         /* lastino was not last in chunk */
 452                             (chunkidx = agino - gino + 1) <
 453                                     XFS_INODES_PER_CHUNK &&
 454                                         /* there are some left allocated */
 455                             XFS_INOBT_MASKN(chunkidx,
 456                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 457                                 /*
 458                                  * Grab the chunk record.  Mark all the
 459                                  * uninteresting inodes (because they're
 460                                  * before our start point) free.
 461                                  */
 462                                 for (i = 0; i < chunkidx; i++) {
 463                                         if (XFS_INOBT_MASK(i) & ~gfree)
 464                                                 gcnt++;
 465                                 }
 466                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 467                                 irbp->ir_startino = gino;
 468                                 irbp->ir_freecount = gcnt;
 469                                 irbp->ir_free = gfree;
 470                                 irbp++;
 471                                 agino = gino + XFS_INODES_PER_CHUNK;
 472                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 473                         } else {
 474                                 /*
 475                                  * If any of those tests failed, bump the
 476                                  * inode number (just in case).
 477                                  */
 478                                 agino++;
 479                                 icount = 0;
 480                         }
 481                         /*
 482                          * In any case, increment to the next record.
 483                          */
 484                         if (!error)
 485                                 error = xfs_inobt_increment(cur, 0, &tmp);
 486                 } else {
 487                         /*
 488                          * Start of ag.  Lookup the first inode chunk.
 489                          */
 490                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 491                         icount = 0;
 492                 }
 493                 /*
 494                  * Loop through inode btree records in this ag,
 495                  * until we run out of inodes or space in the buffer.
 496                  */
 497                 while (irbp < irbufend && icount < ubcount) {
 498                         /*
 499                          * Loop as long as we're unable to read the
 500                          * inode btree.
 501                          */
 502                         while (error) {
 503                                 agino += XFS_INODES_PER_CHUNK;
 504                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 505                                                 be32_to_cpu(agi->agi_length))
 506                                         break;
 507                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 508                                                             &tmp);
 509                                 cond_resched();
 510                         }
 511                         /*
 512                          * If ran off the end of the ag either with an error,
 513                          * or the normal way, set end and stop collecting.
 514                          */
 515                         if (error ||
 516                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 517                                     &gfree, &i)) ||
 518                             i == 0) {
 519                                 end_of_ag = 1;
 520                                 break;
 521                         }
 522                         /*
 523                          * If this chunk has any allocated inodes, save it.
 524                          * Also start read-ahead now for this chunk.
 525                          */
 526                         if (gcnt < XFS_INODES_PER_CHUNK) {
 527                                 /*
 528                                  * Loop over all clusters in the next chunk.
 529                                  * Do a readahead if there are any allocated
 530                                  * inodes in that cluster.
 531                                  */
 532                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 533                                      chunkidx = 0;
 534                                      chunkidx < XFS_INODES_PER_CHUNK;
 535                                      chunkidx += nicluster,
 536                                      agbno += nbcluster) {
 537                                         if (XFS_INOBT_MASKN(chunkidx,
 538                                                             nicluster) & ~gfree)
 539                                                 xfs_btree_reada_bufs(mp, agno,
 540                                                         agbno, nbcluster);
 541                                 }
 542                                 irbp->ir_startino = gino;
 543                                 irbp->ir_freecount = gcnt;
 544                                 irbp->ir_free = gfree;
 545                                 irbp++;
 546                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 547                         }
 548                         /*
 549                          * Set agino to after this chunk and bump the cursor.
 550                          */
 551                         agino = gino + XFS_INODES_PER_CHUNK;
 552                         error = xfs_inobt_increment(cur, 0, &tmp);
 553                         cond_resched();
 554                 }
 555                 /*
 556                  * Drop the btree buffers and the agi buffer.
 557                  * We can't hold any of the locks these represent
 558                  * when calling iget.
 559                  */
 560                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 561                 xfs_buf_relse(agbp);
 562                 /*
 563                  * Now format all the good inodes into the user's buffer.
 564                  */
 565                 irbufend = irbp;
 566                 for (irbp = irbuf;
 567                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 568                         /*
 569                          * Now process this chunk of inodes.
 570                          */
 571                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 572                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 573                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 574                              chunkidx++, clustidx++, agino++) {
 575                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 576                                 /*
 577                                  * Recompute agbno if this is the
 578                                  * first inode of the cluster.
 579                                  *
 580                                  * Careful with clustidx.   There can be
 581                                  * multple clusters per chunk, a single
 582                                  * cluster per chunk or a cluster that has
 583                                  * inodes represented from several different
 584                                  * chunks (if blocksize is large).
 585                                  *
 586                                  * Because of this, the starting clustidx is
 587                                  * initialized to zero in this loop but must
 588                                  * later be reset after reading in the cluster
 589                                  * buffer.
 590                                  */
 591                                 if ((chunkidx & (nicluster - 1)) == 0) {
 592                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 593                                                         irbp->ir_startino) +
 594                                                 ((chunkidx & nimask) >>
 595                                                  mp->m_sb.sb_inopblog);
 596
 597                                         if (flags & (BULKSTAT_FG_QUICK |
 598                                                      BULKSTAT_FG_INLINE)) {
 599                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 600                                                                        agino);
 601                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 602                                                                        agbno);
 603
 604                                                 /*
 605                                                  * Get the inode cluster buffer
 606                                                  */
 607                                                 ASSERT(xfs_inode_zone != NULL);
 608                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 609                                                                       KM_SLEEP);
 610                                                 ip->i_ino = ino;
 611                                                 ip->i_mount = mp;
 612                                                 spin_lock_init(&ip->i_flags_lock);
 613                                                 if (bp)
 614                                                         xfs_buf_relse(bp);
 615                                                 error = xfs_itobp(mp, NULL, ip,
 616                                                                 &dip, &bp, bno,
 617                                                                 XFS_IMAP_BULKSTAT);
 618                                                 if (!error)
 619                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 620                                                 kmem_zone_free(xfs_inode_zone, ip);
 621                                                 if (XFS_TEST_ERROR(error != 0,
 622                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 623                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 624                                                         bp = NULL;
 625                                                         ubleft = 0;
 626                                                         rval = error;
 627                                                         break;
 628                                                 }
 629                                         }
 630                                 }
 631                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 632                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 633                                 /*
 634                                  * Skip if this inode is free.
 635                                  */
 636                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 637                                         lastino = ino;
 638                                         continue;
 639                                 }
 640                                 /*
 641                                  * Count used inodes as free so we can tell
 642                                  * when the chunk is used up.
 643                                  */
 644                                 irbp->ir_freecount++;
 645                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 646                                                              clustidx, &dip)) {
 647                                         lastino = ino;
 648                                         continue;
 649                                 }
 650                                 /*
 651                                  * If we need to do an iget, cannot hold bp.
 652                                  * Drop it, until starting the next cluster.
 653                                  */
 654                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 655                                         if (bp)
 656                                                 xfs_buf_relse(bp);
 657                                         bp = NULL;
 658                                 }
 659
 660                                 /*
 661                                  * Get the inode and fill in a single buffer.
 662                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 663                                  * BULKSTAT_FG_IGET uses igets.
 664                                  * BULKSTAT_FG_INLINE uses dip if we have an
 665                                  * inline attr fork, else igets.
 666                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 667                                  * This is also used to count inodes/blks, etc
 668                                  * in xfs_qm_quotacheck.
 669                                  */
 670                                 ubused = statstruct_size;
 671                                 error = formatter(mp, ino, ubufp,
 672                                                 ubleft, private_data,
 673                                                 bno, &ubused, dip, &fmterror);
 674                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 675                                         if (error && error != ENOENT &&
 676                                                 error != EINVAL) {
 677                                                 ubleft = 0;
 678                                                 rval = error;
 679                                                 break;
 680                                         }
 681                                         lastino = ino;
 682                                         continue;
 683                                 }
 684                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 685                                         ubleft = 0;
 686                                         ASSERT(error);
 687                                         rval = error;
 688                                         break;
 689                                 }
 690                                 if (ubufp)
 691                                         ubufp += ubused;
 692                                 ubleft -= ubused;
 693                                 ubelem++;
 694                                 lastino = ino;
 695                         }
 696
 697                         cond_resched();
 698                 }
 699
 700                 if (bp)
 701                         xfs_buf_relse(bp);
 702
 703                 /*
 704                  * Set up for the next loop iteration.
 705                  */
 706                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 707                         if (end_of_ag) {
 708                                 agno++;
 709                                 agino = 0;
 710                         } else
 711                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 712                 } else
 713                         break;
 714         }
 715         /*
 716          * Done, we're either out of filesystem or space to put the data.
 717          */
 718         kmem_free(irbuf, irbsize);
 719         *ubcountp = ubelem;
 720         /*
 721          * Found some inodes, return them now and return the error next time.
 722          */
 723         if (ubelem)
 724                 rval = 0;
 725         if (agno >= mp->m_sb.sb_agcount) {
 726                 /*
 727                  * If we ran out of filesystem, mark lastino as off
 728                  * the end of the filesystem, so the next call
 729                  * will return immediately.
 730                  */
 731                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 732                 *done = 1;
 733         } else
 734                 *lastinop = (xfs_ino_t)lastino;
 735
 736         return rval;
 737 }
 738
 739 /*
 740  * Return stat information in bulk (by-inode) for the filesystem.
 741  * Special case for non-sequential one inode bulkstat.
 742  */
 743 int                                     /* error status */
 744 xfs_bulkstat_single(
 745         xfs_mount_t             *mp,    /* mount point for filesystem */
 746         xfs_ino_t               *lastinop, /* inode to return */
 747         char                    __user *buffer, /* buffer with inode stats */
 748         int                     *done)  /* 1 if there are more stats to get */
 749 {
 750         int                     count;  /* count value for bulkstat call */
 751         int                     error;  /* return value */
 752         xfs_ino_t               ino;    /* filesystem inode number */
 753         int                     res;    /* result from bs1 */
 754
 755         /*
 756          * note that requesting valid inode numbers which are not allocated
 757          * to inodes will most likely cause xfs_itobp to generate warning
 758          * messages about bad magic numbers. This is ok. The fact that
 759          * the inode isn't actually an inode is handled by the
 760          * error check below. Done this way to make the usual case faster
 761          * at the expense of the error case.
 762          */
 763
 764         ino = (xfs_ino_t)*lastinop;
 765         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 766                                  NULL, 0, NULL, NULL, &res);
 767         if (error) {
 768                 /*
 769                  * Special case way failed, do it the "long" way
 770                  * to see if that works.
 771                  */
 772                 (*lastinop)--;
 773                 count = 1;
 774                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 775                                 NULL, sizeof(xfs_bstat_t), buffer,
 776                                 BULKSTAT_FG_IGET, done))
 777                         return error;
 778                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 779                         return error == EFSCORRUPTED ?
 780                                 XFS_ERROR(EINVAL) : error;
 781                 else
 782                         return 0;
 783         }
 784         *done = 0;
 785         return 0;
 786 }
 787
 788 int
 789 xfs_inumbers_fmt(
 790         void                    __user *ubuffer, /* buffer to write to */
 791         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 792         long                    count,          /* # of elements to read */
 793         long                    *written)       /* # of bytes written */
 794 {
 795         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 796                 return -EFAULT;
 797         *written = count * sizeof(*buffer);
 798         return 0;
 799 }
 800
 801 /*
 802  * Return inode number table for the filesystem.
 803  */
 804 int                                     /* error status */
 805 xfs_inumbers(
 806         xfs_mount_t     *mp,            /* mount point for filesystem */
 807         xfs_ino_t       *lastino,       /* last inode returned */
 808         int             *count,         /* size of buffer/count returned */
 809         void            __user *ubuffer,/* buffer with inode descriptions */
 810         inumbers_fmt_pf formatter)
 811 {
 812         xfs_buf_t       *agbp;
 813         xfs_agino_t     agino;
 814         xfs_agnumber_t  agno;
 815         int             bcount;
 816         xfs_inogrp_t    *buffer;
 817         int             bufidx;
 818         xfs_btree_cur_t *cur;
 819         int             error;
 820         __int32_t       gcnt;
 821         xfs_inofree_t   gfree;
 822         xfs_agino_t     gino;
 823         int             i;
 824         xfs_ino_t       ino;
 825         int             left;
 826         int             tmp;
 827
 828         ino = (xfs_ino_t)*lastino;
 829         agno = XFS_INO_TO_AGNO(mp, ino);
 830         agino = XFS_INO_TO_AGINO(mp, ino);
 831         left = *count;
 832         *count = 0;
 833         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 834         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 835         error = bufidx = 0;
 836         cur = NULL;
 837         agbp = NULL;
 838         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 839                 if (agbp == NULL) {
 840                         down_read(&mp->m_peraglock);
 841                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 842                         up_read(&mp->m_peraglock);
 843                         if (error) {
 844                                 /*
 845                                  * If we can't read the AGI of this ag,
 846                                  * then just skip to the next one.
 847                                  */
 848                                 ASSERT(cur == NULL);
 849                                 agbp = NULL;
 850                                 agno++;
 851                                 agino = 0;
 852                                 continue;
 853                         }
 854                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 855                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 856                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 857                         if (error) {
 858                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 859                                 cur = NULL;
 860                                 xfs_buf_relse(agbp);
 861                                 agbp = NULL;
 862                                 /*
 863                                  * Move up the last inode in the current
 864                                  * chunk.  The lookup_ge will always get
 865                                  * us the first inode in the next chunk.
 866                                  */
 867                                 agino += XFS_INODES_PER_CHUNK - 1;
 868                                 continue;
 869                         }
 870                 }
 871                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 872                         &i)) ||
 873                     i == 0) {
 874                         xfs_buf_relse(agbp);
 875                         agbp = NULL;
 876                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 877                         cur = NULL;
 878                         agno++;
 879                         agino = 0;
 880                         continue;
 881                 }
 882                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 883                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 884                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 885                 buffer[bufidx].xi_allocmask = ~gfree;
 886                 bufidx++;
 887                 left--;
 888                 if (bufidx == bcount) {
 889                         long written;
 890                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 891                                 error = XFS_ERROR(EFAULT);
 892                                 break;
 893                         }
 894                         ubuffer += written;
 895                         *count += bufidx;
 896                         bufidx = 0;
 897                 }
 898                 if (left) {
 899                         error = xfs_inobt_increment(cur, 0, &tmp);
 900                         if (error) {
 901                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 902                                 cur = NULL;
 903                                 xfs_buf_relse(agbp);
 904                                 agbp = NULL;
 905                                 /*
 906                                  * The agino value has already been bumped.
 907                                  * Just try to skip up to it.
 908                                  */
 909                                 agino += XFS_INODES_PER_CHUNK;
 910                                 continue;
 911                         }
 912                 }
 913         }
 914         if (!error) {
 915                 if (bufidx) {
 916                         long written;
 917                         if (formatter(ubuffer, buffer, bufidx, &written))
 918                                 error = XFS_ERROR(EFAULT);
 919                         else
 920                                 *count += bufidx;
 921                 }
 922                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 923         }
 924         kmem_free(buffer, bcount * sizeof(*buffer));
 925         if (cur)
 926                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 927                                            XFS_BTREE_NOERROR));
 928         if (agbp)
 929                 xfs_buf_relse(agbp);
 930         return error;
 931 }