err.no 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 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, 0, XFS_ILOCK_SHARED, &ip, bno);
  56         if (error) {
  57                 *stat = BULKSTAT_RV_NOTHING;
  58                 return error;
  59         }
  60
  61         ASSERT(ip != NULL);
  62         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  63         if (ip->i_d.di_mode == 0) {
  64                 *stat = BULKSTAT_RV_NOTHING;
  65                 error = XFS_ERROR(ENOENT);
  66                 goto out_iput;
  67         }
  68
  69         vp = XFS_ITOV(ip);
  70         dic = &ip->i_d;
  71
  72         /* xfs_iget returns the following without needing
  73          * further change.
  74          */
  75         buf->bs_nlink = dic->di_nlink;
  76         buf->bs_projid = dic->di_projid;
  77         buf->bs_ino = ino;
  78         buf->bs_mode = dic->di_mode;
  79         buf->bs_uid = dic->di_uid;
  80         buf->bs_gid = dic->di_gid;
  81         buf->bs_size = dic->di_size;
  82         vn_atime_to_bstime(vp, &buf->bs_atime);
  83         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  84         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  85         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  86         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  87         buf->bs_xflags = xfs_ip2xflags(ip);
  88         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  89         buf->bs_extents = dic->di_nextents;
  90         buf->bs_gen = dic->di_gen;
  91         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  92         buf->bs_dmevmask = dic->di_dmevmask;
  93         buf->bs_dmstate = dic->di_dmstate;
  94         buf->bs_aextents = dic->di_anextents;
  95
  96         switch (dic->di_format) {
  97         case XFS_DINODE_FMT_DEV:
  98                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
  99                 buf->bs_blksize = BLKDEV_IOSIZE;
 100                 buf->bs_blocks = 0;
 101                 break;
 102         case XFS_DINODE_FMT_LOCAL:
 103         case XFS_DINODE_FMT_UUID:
 104                 buf->bs_rdev = 0;
 105                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 106                 buf->bs_blocks = 0;
 107                 break;
 108         case XFS_DINODE_FMT_EXTENTS:
 109         case XFS_DINODE_FMT_BTREE:
 110                 buf->bs_rdev = 0;
 111                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 112                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 113                 break;
 114         }
 115
 116  out_iput:
 117         xfs_iput(ip, XFS_ILOCK_SHARED);
 118         return error;
 119 }
 120
 121 STATIC int
 122 xfs_bulkstat_one_dinode(
 123         xfs_mount_t     *mp,            /* mount point for filesystem */
 124         xfs_ino_t       ino,            /* inode number to get data for */
 125         xfs_dinode_t    *dip,           /* dinode inode pointer */
 126         xfs_bstat_t     *buf)           /* return buffer */
 127 {
 128         xfs_dinode_core_t *dic;         /* dinode core info pointer */
 129
 130         dic = &dip->di_core;
 131
 132         /*
 133          * The inode format changed when we moved the link count and
 134          * made it 32 bits long.  If this is an old format inode,
 135          * convert it in memory to look like a new one.  If it gets
 136          * flushed to disk we will convert back before flushing or
 137          * logging it.  We zero out the new projid field and the old link
 138          * count field.  We'll handle clearing the pad field (the remains
 139          * of the old uuid field) when we actually convert the inode to
 140          * the new format. We don't change the version number so that we
 141          * can distinguish this from a real new format inode.
 142          */
 143         if (INT_GET(dic->di_version, ARCH_CONVERT) == XFS_DINODE_VERSION_1) {
 144                 buf->bs_nlink = INT_GET(dic->di_onlink, ARCH_CONVERT);
 145                 buf->bs_projid = 0;
 146         } else {
 147                 buf->bs_nlink = INT_GET(dic->di_nlink, ARCH_CONVERT);
 148                 buf->bs_projid = INT_GET(dic->di_projid, ARCH_CONVERT);
 149         }
 150
 151         buf->bs_ino = ino;
 152         buf->bs_mode = INT_GET(dic->di_mode, ARCH_CONVERT);
 153         buf->bs_uid = INT_GET(dic->di_uid, ARCH_CONVERT);
 154         buf->bs_gid = INT_GET(dic->di_gid, ARCH_CONVERT);
 155         buf->bs_size = INT_GET(dic->di_size, ARCH_CONVERT);
 156         buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, ARCH_CONVERT);
 157         buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, ARCH_CONVERT);
 158         buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, ARCH_CONVERT);
 159         buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, ARCH_CONVERT);
 160         buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, ARCH_CONVERT);
 161         buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, ARCH_CONVERT);
 162         buf->bs_xflags = xfs_dic2xflags(dic);
 163         buf->bs_extsize = INT_GET(dic->di_extsize, ARCH_CONVERT) << mp->m_sb.sb_blocklog;
 164         buf->bs_extents = INT_GET(dic->di_nextents, ARCH_CONVERT);
 165         buf->bs_gen = INT_GET(dic->di_gen, ARCH_CONVERT);
 166         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 167         buf->bs_dmevmask = INT_GET(dic->di_dmevmask, ARCH_CONVERT);
 168         buf->bs_dmstate = INT_GET(dic->di_dmstate, ARCH_CONVERT);
 169         buf->bs_aextents = INT_GET(dic->di_anextents, ARCH_CONVERT);
 170
 171         switch (INT_GET(dic->di_format, ARCH_CONVERT)) {
 172         case XFS_DINODE_FMT_DEV:
 173                 buf->bs_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT);
 174                 buf->bs_blksize = BLKDEV_IOSIZE;
 175                 buf->bs_blocks = 0;
 176                 break;
 177         case XFS_DINODE_FMT_LOCAL:
 178         case XFS_DINODE_FMT_UUID:
 179                 buf->bs_rdev = 0;
 180                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 181                 buf->bs_blocks = 0;
 182                 break;
 183         case XFS_DINODE_FMT_EXTENTS:
 184         case XFS_DINODE_FMT_BTREE:
 185                 buf->bs_rdev = 0;
 186                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 187                 buf->bs_blocks = INT_GET(dic->di_nblocks, ARCH_CONVERT);
 188                 break;
 189         }
 190
 191         return 0;
 192 }
 193
 194 /*
 195  * Return stat information for one inode.
 196  * Return 0 if ok, else errno.
 197  */
 198 int                             /* error status */
 199 xfs_bulkstat_one(
 200         xfs_mount_t     *mp,            /* mount point for filesystem */
 201         xfs_ino_t       ino,            /* inode number to get data for */
 202         void            __user *buffer, /* buffer to place output in */
 203         int             ubsize,         /* size of buffer */
 204         void            *private_data,  /* my private data */
 205         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 206         int             *ubused,        /* bytes used by me */
 207         void            *dibuff,        /* on-disk inode buffer */
 208         int             *stat)          /* BULKSTAT_RV_... */
 209 {
 210         xfs_bstat_t     *buf;           /* return buffer */
 211         int             error = 0;      /* error value */
 212         xfs_dinode_t    *dip;           /* dinode inode pointer */
 213
 214         dip = (xfs_dinode_t *)dibuff;
 215
 216         if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
 217             (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 218              (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
 219                 *stat = BULKSTAT_RV_NOTHING;
 220                 return XFS_ERROR(EINVAL);
 221         }
 222         if (ubsize < sizeof(*buf)) {
 223                 *stat = BULKSTAT_RV_NOTHING;
 224                 return XFS_ERROR(ENOMEM);
 225         }
 226
 227         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 228
 229         if (dip == NULL) {
 230                 /* We're not being passed a pointer to a dinode.  This happens
 231                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 232                  */
 233                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 234                 if (error)
 235                         goto out_free;
 236         } else {
 237                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 238         }
 239
 240         if (copy_to_user(buffer, buf, sizeof(*buf)))  {
 241                 *stat = BULKSTAT_RV_NOTHING;
 242                 error =  EFAULT;
 243                 goto out_free;
 244         }
 245
 246         *stat = BULKSTAT_RV_DIDONE;
 247         if (ubused)
 248                 *ubused = sizeof(*buf);
 249
 250  out_free:
 251         kmem_free(buf, sizeof(*buf));
 252         return error;
 253 }
 254
 255 /*
 256  * Test to see whether we can use the ondisk inode directly, based
 257  * on the given bulkstat flags, filling in dipp accordingly.
 258  * Returns zero if the inode is dodgey.
 259  */
 260 STATIC int
 261 xfs_bulkstat_use_dinode(
 262         xfs_mount_t     *mp,
 263         int             flags,
 264         xfs_buf_t       *bp,
 265         int             clustidx,
 266         xfs_dinode_t    **dipp)
 267 {
 268         xfs_dinode_t    *dip;
 269         unsigned int    aformat;
 270
 271         *dipp = NULL;
 272         if (!bp || (flags & BULKSTAT_FG_IGET))
 273                 return 1;
 274         dip = (xfs_dinode_t *)
 275                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 276         if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT) != XFS_DINODE_MAGIC ||
 277             !XFS_DINODE_GOOD_VERSION(
 278                         INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
 279                 return 0;
 280         if (flags & BULKSTAT_FG_QUICK) {
 281                 *dipp = dip;
 282                 return 1;
 283         }
 284         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 285         aformat = INT_GET(dip->di_core.di_aformat, ARCH_CONVERT);
 286         if ((XFS_CFORK_Q(&dip->di_core) == 0) ||
 287             (aformat == XFS_DINODE_FMT_LOCAL) ||
 288             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
 289                 *dipp = dip;
 290                 return 1;
 291         }
 292         return 1;
 293 }
 294
 295 /*
 296  * Return stat information in bulk (by-inode) for the filesystem.
 297  */
 298 int                                     /* error status */
 299 xfs_bulkstat(
 300         xfs_mount_t             *mp,    /* mount point for filesystem */
 301         xfs_ino_t               *lastinop, /* last inode returned */
 302         int                     *ubcountp, /* size of buffer/count returned */
 303         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 304         void                    *private_data,/* private data for formatter */
 305         size_t                  statstruct_size, /* sizeof struct filling */
 306         char                    __user *ubuffer, /* buffer with inode stats */
 307         int                     flags,  /* defined in xfs_itable.h */
 308         int                     *done)  /* 1 if there are more stats to get */
 309 {
 310         xfs_agblock_t           agbno=0;/* allocation group block number */
 311         xfs_buf_t               *agbp;  /* agi header buffer */
 312         xfs_agi_t               *agi;   /* agi header data */
 313         xfs_agino_t             agino;  /* inode # in allocation group */
 314         xfs_agnumber_t          agno;   /* allocation group number */
 315         xfs_daddr_t             bno;    /* inode cluster start daddr */
 316         int                     chunkidx; /* current index into inode chunk */
 317         int                     clustidx; /* current index into inode cluster */
 318         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 319         int                     end_of_ag; /* set if we've seen the ag end */
 320         int                     error;  /* error code */
 321         int                     fmterror;/* bulkstat formatter result */
 322         __int32_t               gcnt;   /* current btree rec's count */
 323         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 324         xfs_agino_t             gino;   /* current btree rec's start inode */
 325         int                     i;      /* loop index */
 326         int                     icount; /* count of inodes good in irbuf */
 327         xfs_ino_t               ino;    /* inode number (filesystem) */
 328         xfs_inobt_rec_t         *irbp;  /* current irec buffer pointer */
 329         xfs_inobt_rec_t         *irbuf; /* start of irec buffer */
 330         xfs_inobt_rec_t         *irbufend; /* end of good irec buffer entries */
 331         xfs_ino_t               lastino=0; /* last inode number returned */
 332         int                     nbcluster; /* # of blocks in a cluster */
 333         int                     nicluster; /* # of inodes in a cluster */
 334         int                     nimask; /* mask for inode clusters */
 335         int                     nirbuf; /* size of irbuf */
 336         int                     rval;   /* return value error code */
 337         int                     tmp;    /* result value from btree calls */
 338         int                     ubcount; /* size of user's buffer */
 339         int                     ubleft; /* bytes left in user's buffer */
 340         char                    __user *ubufp;  /* pointer into user's buffer */
 341         int                     ubelem; /* spaces used in user's buffer */
 342         int                     ubused; /* bytes used by formatter */
 343         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 344         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 345         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 346
 347         /*
 348          * Get the last inode value, see if there's nothing to do.
 349          */
 350         ino = (xfs_ino_t)*lastinop;
 351         dip = NULL;
 352         agno = XFS_INO_TO_AGNO(mp, ino);
 353         agino = XFS_INO_TO_AGINO(mp, ino);
 354         if (agno >= mp->m_sb.sb_agcount ||
 355             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 356                 *done = 1;
 357                 *ubcountp = 0;
 358                 return 0;
 359         }
 360         ubcount = *ubcountp; /* statstruct's */
 361         ubleft = ubcount * statstruct_size; /* bytes */
 362         *ubcountp = ubelem = 0;
 363         *done = 0;
 364         fmterror = 0;
 365         ubufp = ubuffer;
 366         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 367                 mp->m_sb.sb_inopblock :
 368                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 369         nimask = ~(nicluster - 1);
 370         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 371         /*
 372          * Allocate a page-sized buffer for inode btree records.
 373          * We could try allocating something smaller, but for normal
 374          * calls we'll always (potentially) need the whole page.
 375          */
 376         irbuf = kmem_alloc(NBPC, KM_SLEEP);
 377         nirbuf = NBPC / sizeof(*irbuf);
 378         /*
 379          * Loop over the allocation groups, starting from the last
 380          * inode returned; 0 means start of the allocation group.
 381          */
 382         rval = 0;
 383         while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
 384                 bp = NULL;
 385                 down_read(&mp->m_peraglock);
 386                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 387                 up_read(&mp->m_peraglock);
 388                 if (error) {
 389                         /*
 390                          * Skip this allocation group and go to the next one.
 391                          */
 392                         agno++;
 393                         agino = 0;
 394                         continue;
 395                 }
 396                 agi = XFS_BUF_TO_AGI(agbp);
 397                 /*
 398                  * Allocate and initialize a btree cursor for ialloc btree.
 399                  */
 400                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 401                         (xfs_inode_t *)0, 0);
 402                 irbp = irbuf;
 403                 irbufend = irbuf + nirbuf;
 404                 end_of_ag = 0;
 405                 /*
 406                  * If we're returning in the middle of an allocation group,
 407                  * we need to get the remainder of the chunk we're in.
 408                  */
 409                 if (agino > 0) {
 410                         /*
 411                          * Lookup the inode chunk that this inode lives in.
 412                          */
 413                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 414                         if (!error &&   /* no I/O error */
 415                             tmp &&      /* lookup succeeded */
 416                                         /* got the record, should always work */
 417                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 418                                     &gfree, &i)) &&
 419                             i == 1 &&
 420                                         /* this is the right chunk */
 421                             agino < gino + XFS_INODES_PER_CHUNK &&
 422                                         /* lastino was not last in chunk */
 423                             (chunkidx = agino - gino + 1) <
 424                                     XFS_INODES_PER_CHUNK &&
 425                                         /* there are some left allocated */
 426                             XFS_INOBT_MASKN(chunkidx,
 427                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 428                                 /*
 429                                  * Grab the chunk record.  Mark all the
 430                                  * uninteresting inodes (because they're
 431                                  * before our start point) free.
 432                                  */
 433                                 for (i = 0; i < chunkidx; i++) {
 434                                         if (XFS_INOBT_MASK(i) & ~gfree)
 435                                                 gcnt++;
 436                                 }
 437                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 438                                 irbp->ir_startino = cpu_to_be32(gino);
 439                                 irbp->ir_freecount = cpu_to_be32(gcnt);
 440                                 irbp->ir_free = cpu_to_be64(gfree);
 441                                 irbp++;
 442                                 agino = gino + XFS_INODES_PER_CHUNK;
 443                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 444                         } else {
 445                                 /*
 446                                  * If any of those tests failed, bump the
 447                                  * inode number (just in case).
 448                                  */
 449                                 agino++;
 450                                 icount = 0;
 451                         }
 452                         /*
 453                          * In any case, increment to the next record.
 454                          */
 455                         if (!error)
 456                                 error = xfs_inobt_increment(cur, 0, &tmp);
 457                 } else {
 458                         /*
 459                          * Start of ag.  Lookup the first inode chunk.
 460                          */
 461                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 462                         icount = 0;
 463                 }
 464                 /*
 465                  * Loop through inode btree records in this ag,
 466                  * until we run out of inodes or space in the buffer.
 467                  */
 468                 while (irbp < irbufend && icount < ubcount) {
 469                         /*
 470                          * Loop as long as we're unable to read the
 471                          * inode btree.
 472                          */
 473                         while (error) {
 474                                 agino += XFS_INODES_PER_CHUNK;
 475                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 476                                                 be32_to_cpu(agi->agi_length))
 477                                         break;
 478                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 479                                                             &tmp);
 480                         }
 481                         /*
 482                          * If ran off the end of the ag either with an error,
 483                          * or the normal way, set end and stop collecting.
 484                          */
 485                         if (error ||
 486                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 487                                     &gfree, &i)) ||
 488                             i == 0) {
 489                                 end_of_ag = 1;
 490                                 break;
 491                         }
 492                         /*
 493                          * If this chunk has any allocated inodes, save it.
 494                          */
 495                         if (gcnt < XFS_INODES_PER_CHUNK) {
 496                                 irbp->ir_startino = cpu_to_be32(gino);
 497                                 irbp->ir_freecount = cpu_to_be32(gcnt);
 498                                 irbp->ir_free = cpu_to_be64(gfree);
 499                                 irbp++;
 500                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 501                         }
 502                         /*
 503                          * Set agino to after this chunk and bump the cursor.
 504                          */
 505                         agino = gino + XFS_INODES_PER_CHUNK;
 506                         error = xfs_inobt_increment(cur, 0, &tmp);
 507                 }
 508                 /*
 509                  * Drop the btree buffers and the agi buffer.
 510                  * We can't hold any of the locks these represent
 511                  * when calling iget.
 512                  */
 513                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 514                 xfs_buf_relse(agbp);
 515                 /*
 516                  * Now format all the good inodes into the user's buffer.
 517                  */
 518                 irbufend = irbp;
 519                 for (irbp = irbuf;
 520                      irbp < irbufend && ubleft >= statstruct_size; irbp++) {
 521                         /*
 522                          * Read-ahead the next chunk's worth of inodes.
 523                          */
 524                         if (&irbp[1] < irbufend) {
 525                                 /*
 526                                  * Loop over all clusters in the next chunk.
 527                                  * Do a readahead if there are any allocated
 528                                  * inodes in that cluster.
 529                                  */
 530                                 for (agbno = XFS_AGINO_TO_AGBNO(mp,
 531                                                         be32_to_cpu(irbp[1].ir_startino)),
 532                                      chunkidx = 0;
 533                                      chunkidx < XFS_INODES_PER_CHUNK;
 534                                      chunkidx += nicluster,
 535                                      agbno += nbcluster) {
 536                                         if (XFS_INOBT_MASKN(chunkidx,
 537                                                             nicluster) &
 538                                             ~(be64_to_cpu(irbp[1].ir_free)))
 539                                                 xfs_btree_reada_bufs(mp, agno,
 540                                                         agbno, nbcluster);
 541                                 }
 542                         }
 543                         /*
 544                          * Now process this chunk of inodes.
 545                          */
 546                         for (agino = be32_to_cpu(irbp->ir_startino), chunkidx = 0, clustidx = 0;
 547                              ubleft > 0 &&
 548                                 be32_to_cpu(irbp->ir_freecount) < XFS_INODES_PER_CHUNK;
 549                              chunkidx++, clustidx++, agino++) {
 550                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 551                                 /*
 552                                  * Recompute agbno if this is the
 553                                  * first inode of the cluster.
 554                                  *
 555                                  * Careful with clustidx.   There can be
 556                                  * multple clusters per chunk, a single
 557                                  * cluster per chunk or a cluster that has
 558                                  * inodes represented from several different
 559                                  * chunks (if blocksize is large).
 560                                  *
 561                                  * Because of this, the starting clustidx is
 562                                  * initialized to zero in this loop but must
 563                                  * later be reset after reading in the cluster
 564                                  * buffer.
 565                                  */
 566                                 if ((chunkidx & (nicluster - 1)) == 0) {
 567                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 568                                                         be32_to_cpu(irbp->ir_startino)) +
 569                                                 ((chunkidx & nimask) >>
 570                                                  mp->m_sb.sb_inopblog);
 571
 572                                         if (flags & (BULKSTAT_FG_QUICK |
 573                                                      BULKSTAT_FG_INLINE)) {
 574                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 575                                                                        agino);
 576                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 577                                                                        agbno);
 578
 579                                                 /*
 580                                                  * Get the inode cluster buffer
 581                                                  */
 582                                                 ASSERT(xfs_inode_zone != NULL);
 583                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 584                                                                       KM_SLEEP);
 585                                                 ip->i_ino = ino;
 586                                                 ip->i_mount = mp;
 587                                                 if (bp)
 588                                                         xfs_buf_relse(bp);
 589                                                 error = xfs_itobp(mp, NULL, ip,
 590                                                                 &dip, &bp, bno,
 591                                                                 XFS_IMAP_BULKSTAT);
 592                                                 if (!error)
 593                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 594                                                 kmem_zone_free(xfs_inode_zone, ip);
 595                                                 if (XFS_TEST_ERROR(error != 0,
 596                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 597                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 598                                                         bp = NULL;
 599                                                         ubleft = 0;
 600                                                         rval = error;
 601                                                         break;
 602                                                 }
 603                                         }
 604                                 }
 605                                 /*
 606                                  * Skip if this inode is free.
 607                                  */
 608                                 if (XFS_INOBT_MASK(chunkidx) & be64_to_cpu(irbp->ir_free))
 609                                         continue;
 610                                 /*
 611                                  * Count used inodes as free so we can tell
 612                                  * when the chunk is used up.
 613                                  */
 614                                 be32_add(&irbp->ir_freecount, 1);
 615                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 616                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 617                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 618                                                              clustidx, &dip))
 619                                         continue;
 620                                 /*
 621                                  * If we need to do an iget, cannot hold bp.
 622                                  * Drop it, until starting the next cluster.
 623                                  */
 624                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 625                                         if (bp)
 626                                                 xfs_buf_relse(bp);
 627                                         bp = NULL;
 628                                 }
 629
 630                                 /*
 631                                  * Get the inode and fill in a single buffer.
 632                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 633                                  * BULKSTAT_FG_IGET uses igets.
 634                                  * BULKSTAT_FG_INLINE uses dip if we have an
 635                                  * inline attr fork, else igets.
 636                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 637                                  * This is also used to count inodes/blks, etc
 638                                  * in xfs_qm_quotacheck.
 639                                  */
 640                                 ubused = statstruct_size;
 641                                 error = formatter(mp, ino, ubufp,
 642                                                 ubleft, private_data,
 643                                                 bno, &ubused, dip, &fmterror);
 644                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 645                                         if (error == ENOMEM)
 646                                                 ubleft = 0;
 647                                         continue;
 648                                 }
 649                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 650                                         ubleft = 0;
 651                                         ASSERT(error);
 652                                         rval = error;
 653                                         break;
 654                                 }
 655                                 if (ubufp)
 656                                         ubufp += ubused;
 657                                 ubleft -= ubused;
 658                                 ubelem++;
 659                                 lastino = ino;
 660                         }
 661                 }
 662
 663                 if (bp)
 664                         xfs_buf_relse(bp);
 665
 666                 /*
 667                  * Set up for the next loop iteration.
 668                  */
 669                 if (ubleft > 0) {
 670                         if (end_of_ag) {
 671                                 agno++;
 672                                 agino = 0;
 673                         } else
 674                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 675                 } else
 676                         break;
 677         }
 678         /*
 679          * Done, we're either out of filesystem or space to put the data.
 680          */
 681         kmem_free(irbuf, NBPC);
 682         *ubcountp = ubelem;
 683         if (agno >= mp->m_sb.sb_agcount) {
 684                 /*
 685                  * If we ran out of filesystem, mark lastino as off
 686                  * the end of the filesystem, so the next call
 687                  * will return immediately.
 688                  */
 689                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 690                 *done = 1;
 691         } else
 692                 *lastinop = (xfs_ino_t)lastino;
 693
 694         return rval;
 695 }
 696
 697 /*
 698  * Return stat information in bulk (by-inode) for the filesystem.
 699  * Special case for non-sequential one inode bulkstat.
 700  */
 701 int                                     /* error status */
 702 xfs_bulkstat_single(
 703         xfs_mount_t             *mp,    /* mount point for filesystem */
 704         xfs_ino_t               *lastinop, /* inode to return */
 705         char                    __user *buffer, /* buffer with inode stats */
 706         int                     *done)  /* 1 if there are more stats to get */
 707 {
 708         int                     count;  /* count value for bulkstat call */
 709         int                     error;  /* return value */
 710         xfs_ino_t               ino;    /* filesystem inode number */
 711         int                     res;    /* result from bs1 */
 712
 713         /*
 714          * note that requesting valid inode numbers which are not allocated
 715          * to inodes will most likely cause xfs_itobp to generate warning
 716          * messages about bad magic numbers. This is ok. The fact that
 717          * the inode isn't actually an inode is handled by the
 718          * error check below. Done this way to make the usual case faster
 719          * at the expense of the error case.
 720          */
 721
 722         ino = (xfs_ino_t)*lastinop;
 723         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 724                                  NULL, 0, NULL, NULL, &res);
 725         if (error) {
 726                 /*
 727                  * Special case way failed, do it the "long" way
 728                  * to see if that works.
 729                  */
 730                 (*lastinop)--;
 731                 count = 1;
 732                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 733                                 NULL, sizeof(xfs_bstat_t), buffer,
 734                                 BULKSTAT_FG_IGET, done))
 735                         return error;
 736                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 737                         return error == EFSCORRUPTED ?
 738                                 XFS_ERROR(EINVAL) : error;
 739                 else
 740                         return 0;
 741         }
 742         *done = 0;
 743         return 0;
 744 }
 745
 746 /*
 747  * Return inode number table for the filesystem.
 748  */
 749 int                                     /* error status */
 750 xfs_inumbers(
 751         xfs_mount_t     *mp,            /* mount point for filesystem */
 752         xfs_ino_t       *lastino,       /* last inode returned */
 753         int             *count,         /* size of buffer/count returned */
 754         xfs_inogrp_t    __user *ubuffer)/* buffer with inode descriptions */
 755 {
 756         xfs_buf_t       *agbp;
 757         xfs_agino_t     agino;
 758         xfs_agnumber_t  agno;
 759         int             bcount;
 760         xfs_inogrp_t    *buffer;
 761         int             bufidx;
 762         xfs_btree_cur_t *cur;
 763         int             error;
 764         __int32_t       gcnt;
 765         xfs_inofree_t   gfree;
 766         xfs_agino_t     gino;
 767         int             i;
 768         xfs_ino_t       ino;
 769         int             left;
 770         int             tmp;
 771
 772         ino = (xfs_ino_t)*lastino;
 773         agno = XFS_INO_TO_AGNO(mp, ino);
 774         agino = XFS_INO_TO_AGINO(mp, ino);
 775         left = *count;
 776         *count = 0;
 777         bcount = MIN(left, (int)(NBPP / sizeof(*buffer)));
 778         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 779         error = bufidx = 0;
 780         cur = NULL;
 781         agbp = NULL;
 782         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 783                 if (agbp == NULL) {
 784                         down_read(&mp->m_peraglock);
 785                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 786                         up_read(&mp->m_peraglock);
 787                         if (error) {
 788                                 /*
 789                                  * If we can't read the AGI of this ag,
 790                                  * then just skip to the next one.
 791                                  */
 792                                 ASSERT(cur == NULL);
 793                                 agbp = NULL;
 794                                 agno++;
 795                                 agino = 0;
 796                                 continue;
 797                         }
 798                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 799                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 800                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 801                         if (error) {
 802                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 803                                 cur = NULL;
 804                                 xfs_buf_relse(agbp);
 805                                 agbp = NULL;
 806                                 /*
 807                                  * Move up the the last inode in the current
 808                                  * chunk.  The lookup_ge will always get
 809                                  * us the first inode in the next chunk.
 810                                  */
 811                                 agino += XFS_INODES_PER_CHUNK - 1;
 812                                 continue;
 813                         }
 814                 }
 815                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 816                         &i)) ||
 817                     i == 0) {
 818                         xfs_buf_relse(agbp);
 819                         agbp = NULL;
 820                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 821                         cur = NULL;
 822                         agno++;
 823                         agino = 0;
 824                         continue;
 825                 }
 826                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 827                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 828                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 829                 buffer[bufidx].xi_allocmask = ~gfree;
 830                 bufidx++;
 831                 left--;
 832                 if (bufidx == bcount) {
 833                         if (copy_to_user(ubuffer, buffer,
 834                                         bufidx * sizeof(*buffer))) {
 835                                 error = XFS_ERROR(EFAULT);
 836                                 break;
 837                         }
 838                         ubuffer += bufidx;
 839                         *count += bufidx;
 840                         bufidx = 0;
 841                 }
 842                 if (left) {
 843                         error = xfs_inobt_increment(cur, 0, &tmp);
 844                         if (error) {
 845                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 846                                 cur = NULL;
 847                                 xfs_buf_relse(agbp);
 848                                 agbp = NULL;
 849                                 /*
 850                                  * The agino value has already been bumped.
 851                                  * Just try to skip up to it.
 852                                  */
 853                                 agino += XFS_INODES_PER_CHUNK;
 854                                 continue;
 855                         }
 856                 }
 857         }
 858         if (!error) {
 859                 if (bufidx) {
 860                         if (copy_to_user(ubuffer, buffer,
 861                                         bufidx * sizeof(*buffer)))
 862                                 error = XFS_ERROR(EFAULT);
 863                         else
 864                                 *count += bufidx;
 865                 }
 866                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 867         }
 868         kmem_free(buffer, bcount * sizeof(*buffer));
 869         if (cur)
 870                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 871                                            XFS_BTREE_NOERROR));
 872         if (agbp)
 873                 xfs_buf_relse(agbp);
 874         return error;
 875 }