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