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