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

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_error.h"
  40 #include "xfs_btree.h"
  41
  42 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         int             error;
  63
  64         error = xfs_iget(mp, NULL, ino,
  65                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
  66         if (error) {
  67                 *stat = BULKSTAT_RV_NOTHING;
  68                 return error;
  69         }
  70
  71         ASSERT(ip != NULL);
  72         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  73
  74         dic = &ip->i_d;
  75
  76         /* xfs_iget returns the following without needing
  77          * further change.
  78          */
  79         buf->bs_nlink = dic->di_nlink;
  80         buf->bs_projid = dic->di_projid;
  81         buf->bs_ino = ino;
  82         buf->bs_mode = dic->di_mode;
  83         buf->bs_uid = dic->di_uid;
  84         buf->bs_gid = dic->di_gid;
  85         buf->bs_size = dic->di_size;
  86         vn_atime_to_bstime(VFS_I(ip), &buf->bs_atime);
  87         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  88         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  89         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  90         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  91         buf->bs_xflags = xfs_ip2xflags(ip);
  92         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  93         buf->bs_extents = dic->di_nextents;
  94         buf->bs_gen = dic->di_gen;
  95         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  96         buf->bs_dmevmask = dic->di_dmevmask;
  97         buf->bs_dmstate = dic->di_dmstate;
  98         buf->bs_aextents = dic->di_anextents;
  99
 100         switch (dic->di_format) {
 101         case XFS_DINODE_FMT_DEV:
 102                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 103                 buf->bs_blksize = BLKDEV_IOSIZE;
 104                 buf->bs_blocks = 0;
 105                 break;
 106         case XFS_DINODE_FMT_LOCAL:
 107         case XFS_DINODE_FMT_UUID:
 108                 buf->bs_rdev = 0;
 109                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 110                 buf->bs_blocks = 0;
 111                 break;
 112         case XFS_DINODE_FMT_EXTENTS:
 113         case XFS_DINODE_FMT_BTREE:
 114                 buf->bs_rdev = 0;
 115                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 116                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 117                 break;
 118         }
 119
 120         xfs_iput(ip, XFS_ILOCK_SHARED);
 121         return error;
 122 }
 123
 124 STATIC void
 125 xfs_bulkstat_one_dinode(
 126         xfs_mount_t     *mp,            /* mount point for filesystem */
 127         xfs_ino_t       ino,            /* inode number to get data for */
 128         xfs_dinode_t    *dic,           /* dinode inode pointer */
 129         xfs_bstat_t     *buf)           /* return buffer */
 130 {
 131         /*
 132          * The inode format changed when we moved the link count and
 133          * made it 32 bits long.  If this is an old format inode,
 134          * convert it in memory to look like a new one.  If it gets
 135          * flushed to disk we will convert back before flushing or
 136          * logging it.  We zero out the new projid field and the old link
 137          * count field.  We'll handle clearing the pad field (the remains
 138          * of the old uuid field) when we actually convert the inode to
 139          * the new format. We don't change the version number so that we
 140          * can distinguish this from a real new format inode.
 141          */
 142         if (dic->di_version == XFS_DINODE_VERSION_1) {
 143                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 144                 buf->bs_projid = 0;
 145         } else {
 146                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 147                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 148         }
 149
 150         buf->bs_ino = ino;
 151         buf->bs_mode = be16_to_cpu(dic->di_mode);
 152         buf->bs_uid = be32_to_cpu(dic->di_uid);
 153         buf->bs_gid = be32_to_cpu(dic->di_gid);
 154         buf->bs_size = be64_to_cpu(dic->di_size);
 155         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 156         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 157         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 158         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 159         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 160         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 161         buf->bs_xflags = xfs_dic2xflags(dic);
 162         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 163         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 164         buf->bs_gen = be32_to_cpu(dic->di_gen);
 165         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 166         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 167         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 168         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 169
 170         switch (dic->di_format) {
 171         case XFS_DINODE_FMT_DEV:
 172                 buf->bs_rdev = xfs_dinode_get_rdev(dic);
 173                 buf->bs_blksize = BLKDEV_IOSIZE;
 174                 buf->bs_blocks = 0;
 175                 break;
 176         case XFS_DINODE_FMT_LOCAL:
 177         case XFS_DINODE_FMT_UUID:
 178                 buf->bs_rdev = 0;
 179                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 180                 buf->bs_blocks = 0;
 181                 break;
 182         case XFS_DINODE_FMT_EXTENTS:
 183         case XFS_DINODE_FMT_BTREE:
 184                 buf->bs_rdev = 0;
 185                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 186                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
 187                 break;
 188         }
 189 }
 190
 191 STATIC int
 192 xfs_bulkstat_one_fmt(
 193         void                    __user *ubuffer,
 194         const xfs_bstat_t       *buffer)
 195 {
 196         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 197                 return -EFAULT;
 198         return sizeof(*buffer);
 199 }
 200
 201 /*
 202  * Return stat information for one inode.
 203  * Return 0 if ok, else errno.
 204  */
 205 int                             /* error status */
 206 xfs_bulkstat_one(
 207         xfs_mount_t     *mp,            /* mount point for filesystem */
 208         xfs_ino_t       ino,            /* inode number to get data for */
 209         void            __user *buffer, /* buffer to place output in */
 210         int             ubsize,         /* size of buffer */
 211         void            *private_data,  /* my private data */
 212         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 213         int             *ubused,        /* bytes used by me */
 214         void            *dibuff,        /* on-disk inode buffer */
 215         int             *stat)          /* BULKSTAT_RV_... */
 216 {
 217         xfs_bstat_t     *buf;           /* return buffer */
 218         int             error = 0;      /* error value */
 219         xfs_dinode_t    *dip;           /* dinode inode pointer */
 220         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
 221
 222         dip = (xfs_dinode_t *)dibuff;
 223         *stat = BULKSTAT_RV_NOTHING;
 224
 225         if (!buffer || xfs_internal_inum(mp, ino))
 226                 return XFS_ERROR(EINVAL);
 227         if (ubsize < sizeof(*buf))
 228                 return XFS_ERROR(ENOMEM);
 229
 230         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 231
 232         if (dip == NULL) {
 233                 /* We're not being passed a pointer to a dinode.  This happens
 234                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 235                  */
 236                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 237                 if (error)
 238                         goto out_free;
 239         } else {
 240                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 241         }
 242
 243         error = formatter(buffer, buf);
 244         if (error < 0)  {
 245                 error = EFAULT;
 246                 goto out_free;
 247         }
 248
 249         *stat = BULKSTAT_RV_DIDONE;
 250         if (ubused)
 251                 *ubused = error;
 252
 253  out_free:
 254         kmem_free(buf);
 255         return error;
 256 }
 257
 258 /*
 259  * Test to see whether we can use the ondisk inode directly, based
 260  * on the given bulkstat flags, filling in dipp accordingly.
 261  * Returns zero if the inode is dodgey.
 262  */
 263 STATIC int
 264 xfs_bulkstat_use_dinode(
 265         xfs_mount_t     *mp,
 266         int             flags,
 267         xfs_buf_t       *bp,
 268         int             clustidx,
 269         xfs_dinode_t    **dipp)
 270 {
 271         xfs_dinode_t    *dip;
 272         unsigned int    aformat;
 273
 274         *dipp = NULL;
 275         if (!bp || (flags & BULKSTAT_FG_IGET))
 276                 return 1;
 277         dip = (xfs_dinode_t *)
 278                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 279         /*
 280          * Check the buffer containing the on-disk inode for di_mode == 0.
 281          * This is to prevent xfs_bulkstat from picking up just reclaimed
 282          * inodes that have their in-core state initialized but not flushed
 283          * to disk yet. This is a temporary hack that would require a proper
 284          * fix in the future.
 285          */
 286         if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
 287             !XFS_DINODE_GOOD_VERSION(dip->di_version) ||
 288             !dip->di_mode)
 289                 return 0;
 290         if (flags & BULKSTAT_FG_QUICK) {
 291                 *dipp = dip;
 292                 return 1;
 293         }
 294         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 295         aformat = dip->di_aformat;
 296         if ((XFS_DFORK_Q(dip) == 0) ||
 297             (aformat == XFS_DINODE_FMT_LOCAL) ||
 298             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_anextents)) {
 299                 *dipp = dip;
 300                 return 1;
 301         }
 302         return 1;
 303 }
 304
 305 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 306
 307 /*
 308  * Return stat information in bulk (by-inode) for the filesystem.
 309  */
 310 int                                     /* error status */
 311 xfs_bulkstat(
 312         xfs_mount_t             *mp,    /* mount point for filesystem */
 313         xfs_ino_t               *lastinop, /* last inode returned */
 314         int                     *ubcountp, /* size of buffer/count returned */
 315         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 316         void                    *private_data,/* private data for formatter */
 317         size_t                  statstruct_size, /* sizeof struct filling */
 318         char                    __user *ubuffer, /* buffer with inode stats */
 319         int                     flags,  /* defined in xfs_itable.h */
 320         int                     *done)  /* 1 if there are more stats to get */
 321 {
 322         xfs_agblock_t           agbno=0;/* allocation group block number */
 323         xfs_buf_t               *agbp;  /* agi header buffer */
 324         xfs_agi_t               *agi;   /* agi header data */
 325         xfs_agino_t             agino;  /* inode # in allocation group */
 326         xfs_agnumber_t          agno;   /* allocation group number */
 327         xfs_daddr_t             bno;    /* inode cluster start daddr */
 328         int                     chunkidx; /* current index into inode chunk */
 329         int                     clustidx; /* current index into inode cluster */
 330         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 331         int                     end_of_ag; /* set if we've seen the ag end */
 332         int                     error;  /* error code */
 333         int                     fmterror;/* bulkstat formatter result */
 334         __int32_t               gcnt;   /* current btree rec's count */
 335         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 336         xfs_agino_t             gino;   /* current btree rec's start inode */
 337         int                     i;      /* loop index */
 338         int                     icount; /* count of inodes good in irbuf */
 339         size_t                  irbsize; /* size of irec buffer in bytes */
 340         xfs_ino_t               ino;    /* inode number (filesystem) */
 341         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 342         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 343         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 344         xfs_ino_t               lastino; /* last inode number returned */
 345         int                     nbcluster; /* # of blocks in a cluster */
 346         int                     nicluster; /* # of inodes in a cluster */
 347         int                     nimask; /* mask for inode clusters */
 348         int                     nirbuf; /* size of irbuf */
 349         int                     rval;   /* return value error code */
 350         int                     tmp;    /* result value from btree calls */
 351         int                     ubcount; /* size of user's buffer */
 352         int                     ubleft; /* bytes left in user's buffer */
 353         char                    __user *ubufp;  /* pointer into user's buffer */
 354         int                     ubelem; /* spaces used in user's buffer */
 355         int                     ubused; /* bytes used by formatter */
 356         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 357         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 358
 359         /*
 360          * Get the last inode value, see if there's nothing to do.
 361          */
 362         ino = (xfs_ino_t)*lastinop;
 363         lastino = ino;
 364         dip = NULL;
 365         agno = XFS_INO_TO_AGNO(mp, ino);
 366         agino = XFS_INO_TO_AGINO(mp, ino);
 367         if (agno >= mp->m_sb.sb_agcount ||
 368             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 369                 *done = 1;
 370                 *ubcountp = 0;
 371                 return 0;
 372         }
 373         if (!ubcountp || *ubcountp <= 0) {
 374                 return EINVAL;
 375         }
 376         ubcount = *ubcountp; /* statstruct's */
 377         ubleft = ubcount * statstruct_size; /* bytes */
 378         *ubcountp = ubelem = 0;
 379         *done = 0;
 380         fmterror = 0;
 381         ubufp = ubuffer;
 382         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 383                 mp->m_sb.sb_inopblock :
 384                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 385         nimask = ~(nicluster - 1);
 386         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 387         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 388                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 389         nirbuf = irbsize / sizeof(*irbuf);
 390
 391         /*
 392          * Loop over the allocation groups, starting from the last
 393          * inode returned; 0 means start of the allocation group.
 394          */
 395         rval = 0;
 396         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 397                 cond_resched();
 398                 bp = NULL;
 399                 down_read(&mp->m_peraglock);
 400                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 401                 up_read(&mp->m_peraglock);
 402                 if (error) {
 403                         /*
 404                          * Skip this allocation group and go to the next one.
 405                          */
 406                         agno++;
 407                         agino = 0;
 408                         continue;
 409                 }
 410                 agi = XFS_BUF_TO_AGI(agbp);
 411                 /*
 412                  * Allocate and initialize a btree cursor for ialloc btree.
 413                  */
 414                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 415                 irbp = irbuf;
 416                 irbufend = irbuf + nirbuf;
 417                 end_of_ag = 0;
 418                 /*
 419                  * If we're returning in the middle of an allocation group,
 420                  * we need to get the remainder of the chunk we're in.
 421                  */
 422                 if (agino > 0) {
 423                         /*
 424                          * Lookup the inode chunk that this inode lives in.
 425                          */
 426                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 427                         if (!error &&   /* no I/O error */
 428                             tmp &&      /* lookup succeeded */
 429                                         /* got the record, should always work */
 430                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 431                                     &gfree, &i)) &&
 432                             i == 1 &&
 433                                         /* this is the right chunk */
 434                             agino < gino + XFS_INODES_PER_CHUNK &&
 435                                         /* lastino was not last in chunk */
 436                             (chunkidx = agino - gino + 1) <
 437                                     XFS_INODES_PER_CHUNK &&
 438                                         /* there are some left allocated */
 439                             XFS_INOBT_MASKN(chunkidx,
 440                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 441                                 /*
 442                                  * Grab the chunk record.  Mark all the
 443                                  * uninteresting inodes (because they're
 444                                  * before our start point) free.
 445                                  */
 446                                 for (i = 0; i < chunkidx; i++) {
 447                                         if (XFS_INOBT_MASK(i) & ~gfree)
 448                                                 gcnt++;
 449                                 }
 450                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 451                                 irbp->ir_startino = gino;
 452                                 irbp->ir_freecount = gcnt;
 453                                 irbp->ir_free = gfree;
 454                                 irbp++;
 455                                 agino = gino + XFS_INODES_PER_CHUNK;
 456                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 457                         } else {
 458                                 /*
 459                                  * If any of those tests failed, bump the
 460                                  * inode number (just in case).
 461                                  */
 462                                 agino++;
 463                                 icount = 0;
 464                         }
 465                         /*
 466                          * In any case, increment to the next record.
 467                          */
 468                         if (!error)
 469                                 error = xfs_btree_increment(cur, 0, &tmp);
 470                 } else {
 471                         /*
 472                          * Start of ag.  Lookup the first inode chunk.
 473                          */
 474                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 475                         icount = 0;
 476                 }
 477                 /*
 478                  * Loop through inode btree records in this ag,
 479                  * until we run out of inodes or space in the buffer.
 480                  */
 481                 while (irbp < irbufend && icount < ubcount) {
 482                         /*
 483                          * Loop as long as we're unable to read the
 484                          * inode btree.
 485                          */
 486                         while (error) {
 487                                 agino += XFS_INODES_PER_CHUNK;
 488                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 489                                                 be32_to_cpu(agi->agi_length))
 490                                         break;
 491                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 492                                                             &tmp);
 493                                 cond_resched();
 494                         }
 495                         /*
 496                          * If ran off the end of the ag either with an error,
 497                          * or the normal way, set end and stop collecting.
 498                          */
 499                         if (error ||
 500                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 501                                     &gfree, &i)) ||
 502                             i == 0) {
 503                                 end_of_ag = 1;
 504                                 break;
 505                         }
 506                         /*
 507                          * If this chunk has any allocated inodes, save it.
 508                          * Also start read-ahead now for this chunk.
 509                          */
 510                         if (gcnt < XFS_INODES_PER_CHUNK) {
 511                                 /*
 512                                  * Loop over all clusters in the next chunk.
 513                                  * Do a readahead if there are any allocated
 514                                  * inodes in that cluster.
 515                                  */
 516                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 517                                      chunkidx = 0;
 518                                      chunkidx < XFS_INODES_PER_CHUNK;
 519                                      chunkidx += nicluster,
 520                                      agbno += nbcluster) {
 521                                         if (XFS_INOBT_MASKN(chunkidx,
 522                                                             nicluster) & ~gfree)
 523                                                 xfs_btree_reada_bufs(mp, agno,
 524                                                         agbno, nbcluster);
 525                                 }
 526                                 irbp->ir_startino = gino;
 527                                 irbp->ir_freecount = gcnt;
 528                                 irbp->ir_free = gfree;
 529                                 irbp++;
 530                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 531                         }
 532                         /*
 533                          * Set agino to after this chunk and bump the cursor.
 534                          */
 535                         agino = gino + XFS_INODES_PER_CHUNK;
 536                         error = xfs_btree_increment(cur, 0, &tmp);
 537                         cond_resched();
 538                 }
 539                 /*
 540                  * Drop the btree buffers and the agi buffer.
 541                  * We can't hold any of the locks these represent
 542                  * when calling iget.
 543                  */
 544                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 545                 xfs_buf_relse(agbp);
 546                 /*
 547                  * Now format all the good inodes into the user's buffer.
 548                  */
 549                 irbufend = irbp;
 550                 for (irbp = irbuf;
 551                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 552                         /*
 553                          * Now process this chunk of inodes.
 554                          */
 555                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 556                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 557                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 558                              chunkidx++, clustidx++, agino++) {
 559                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 560                                 /*
 561                                  * Recompute agbno if this is the
 562                                  * first inode of the cluster.
 563                                  *
 564                                  * Careful with clustidx.   There can be
 565                                  * multple clusters per chunk, a single
 566                                  * cluster per chunk or a cluster that has
 567                                  * inodes represented from several different
 568                                  * chunks (if blocksize is large).
 569                                  *
 570                                  * Because of this, the starting clustidx is
 571                                  * initialized to zero in this loop but must
 572                                  * later be reset after reading in the cluster
 573                                  * buffer.
 574                                  */
 575                                 if ((chunkidx & (nicluster - 1)) == 0) {
 576                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 577                                                         irbp->ir_startino) +
 578                                                 ((chunkidx & nimask) >>
 579                                                  mp->m_sb.sb_inopblog);
 580
 581                                         if (flags & (BULKSTAT_FG_QUICK |
 582                                                      BULKSTAT_FG_INLINE)) {
 583                                                 int offset;
 584
 585                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 586                                                                        agino);
 587                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 588                                                                        agbno);
 589
 590                                                 /*
 591                                                  * Get the inode cluster buffer
 592                                                  */
 593                                                 if (bp)
 594                                                         xfs_buf_relse(bp);
 595
 596                                                 error = xfs_inotobp(mp, NULL, ino, &dip,
 597                                                                     &bp, &offset,
 598                                                                     XFS_IMAP_BULKSTAT);
 599
 600                                                 if (!error)
 601                                                         clustidx = offset / mp->m_sb.sb_inodesize;
 602                                                 if (XFS_TEST_ERROR(error != 0,
 603                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 604                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 605                                                         bp = NULL;
 606                                                         ubleft = 0;
 607                                                         rval = error;
 608                                                         break;
 609                                                 }
 610                                         }
 611                                 }
 612                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 613                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 614                                 /*
 615                                  * Skip if this inode is free.
 616                                  */
 617                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 618                                         lastino = ino;
 619                                         continue;
 620                                 }
 621                                 /*
 622                                  * Count used inodes as free so we can tell
 623                                  * when the chunk is used up.
 624                                  */
 625                                 irbp->ir_freecount++;
 626                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 627                                                              clustidx, &dip)) {
 628                                         lastino = ino;
 629                                         continue;
 630                                 }
 631                                 /*
 632                                  * If we need to do an iget, cannot hold bp.
 633                                  * Drop it, until starting the next cluster.
 634                                  */
 635                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 636                                         if (bp)
 637                                                 xfs_buf_relse(bp);
 638                                         bp = NULL;
 639                                 }
 640
 641                                 /*
 642                                  * Get the inode and fill in a single buffer.
 643                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 644                                  * BULKSTAT_FG_IGET uses igets.
 645                                  * BULKSTAT_FG_INLINE uses dip if we have an
 646                                  * inline attr fork, else igets.
 647                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 648                                  * This is also used to count inodes/blks, etc
 649                                  * in xfs_qm_quotacheck.
 650                                  */
 651                                 ubused = statstruct_size;
 652                                 error = formatter(mp, ino, ubufp,
 653                                                 ubleft, private_data,
 654                                                 bno, &ubused, dip, &fmterror);
 655                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 656                                         if (error && error != ENOENT &&
 657                                                 error != EINVAL) {
 658                                                 ubleft = 0;
 659                                                 rval = error;
 660                                                 break;
 661                                         }
 662                                         lastino = ino;
 663                                         continue;
 664                                 }
 665                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 666                                         ubleft = 0;
 667                                         ASSERT(error);
 668                                         rval = error;
 669                                         break;
 670                                 }
 671                                 if (ubufp)
 672                                         ubufp += ubused;
 673                                 ubleft -= ubused;
 674                                 ubelem++;
 675                                 lastino = ino;
 676                         }
 677
 678                         cond_resched();
 679                 }
 680
 681                 if (bp)
 682                         xfs_buf_relse(bp);
 683
 684                 /*
 685                  * Set up for the next loop iteration.
 686                  */
 687                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 688                         if (end_of_ag) {
 689                                 agno++;
 690                                 agino = 0;
 691                         } else
 692                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 693                 } else
 694                         break;
 695         }
 696         /*
 697          * Done, we're either out of filesystem or space to put the data.
 698          */
 699         kmem_free(irbuf);
 700         *ubcountp = ubelem;
 701         /*
 702          * Found some inodes, return them now and return the error next time.
 703          */
 704         if (ubelem)
 705                 rval = 0;
 706         if (agno >= mp->m_sb.sb_agcount) {
 707                 /*
 708                  * If we ran out of filesystem, mark lastino as off
 709                  * the end of the filesystem, so the next call
 710                  * will return immediately.
 711                  */
 712                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 713                 *done = 1;
 714         } else
 715                 *lastinop = (xfs_ino_t)lastino;
 716
 717         return rval;
 718 }
 719
 720 /*
 721  * Return stat information in bulk (by-inode) for the filesystem.
 722  * Special case for non-sequential one inode bulkstat.
 723  */
 724 int                                     /* error status */
 725 xfs_bulkstat_single(
 726         xfs_mount_t             *mp,    /* mount point for filesystem */
 727         xfs_ino_t               *lastinop, /* inode to return */
 728         char                    __user *buffer, /* buffer with inode stats */
 729         int                     *done)  /* 1 if there are more stats to get */
 730 {
 731         int                     count;  /* count value for bulkstat call */
 732         int                     error;  /* return value */
 733         xfs_ino_t               ino;    /* filesystem inode number */
 734         int                     res;    /* result from bs1 */
 735
 736         /*
 737          * note that requesting valid inode numbers which are not allocated
 738          * to inodes will most likely cause xfs_itobp to generate warning
 739          * messages about bad magic numbers. This is ok. The fact that
 740          * the inode isn't actually an inode is handled by the
 741          * error check below. Done this way to make the usual case faster
 742          * at the expense of the error case.
 743          */
 744
 745         ino = (xfs_ino_t)*lastinop;
 746         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 747                                  NULL, 0, NULL, NULL, &res);
 748         if (error) {
 749                 /*
 750                  * Special case way failed, do it the "long" way
 751                  * to see if that works.
 752                  */
 753                 (*lastinop)--;
 754                 count = 1;
 755                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 756                                 NULL, sizeof(xfs_bstat_t), buffer,
 757                                 BULKSTAT_FG_IGET, done))
 758                         return error;
 759                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 760                         return error == EFSCORRUPTED ?
 761                                 XFS_ERROR(EINVAL) : error;
 762                 else
 763                         return 0;
 764         }
 765         *done = 0;
 766         return 0;
 767 }
 768
 769 int
 770 xfs_inumbers_fmt(
 771         void                    __user *ubuffer, /* buffer to write to */
 772         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 773         long                    count,          /* # of elements to read */
 774         long                    *written)       /* # of bytes written */
 775 {
 776         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 777                 return -EFAULT;
 778         *written = count * sizeof(*buffer);
 779         return 0;
 780 }
 781
 782 /*
 783  * Return inode number table for the filesystem.
 784  */
 785 int                                     /* error status */
 786 xfs_inumbers(
 787         xfs_mount_t     *mp,            /* mount point for filesystem */
 788         xfs_ino_t       *lastino,       /* last inode returned */
 789         int             *count,         /* size of buffer/count returned */
 790         void            __user *ubuffer,/* buffer with inode descriptions */
 791         inumbers_fmt_pf formatter)
 792 {
 793         xfs_buf_t       *agbp;
 794         xfs_agino_t     agino;
 795         xfs_agnumber_t  agno;
 796         int             bcount;
 797         xfs_inogrp_t    *buffer;
 798         int             bufidx;
 799         xfs_btree_cur_t *cur;
 800         int             error;
 801         __int32_t       gcnt;
 802         xfs_inofree_t   gfree;
 803         xfs_agino_t     gino;
 804         int             i;
 805         xfs_ino_t       ino;
 806         int             left;
 807         int             tmp;
 808
 809         ino = (xfs_ino_t)*lastino;
 810         agno = XFS_INO_TO_AGNO(mp, ino);
 811         agino = XFS_INO_TO_AGINO(mp, ino);
 812         left = *count;
 813         *count = 0;
 814         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 815         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 816         error = bufidx = 0;
 817         cur = NULL;
 818         agbp = NULL;
 819         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 820                 if (agbp == NULL) {
 821                         down_read(&mp->m_peraglock);
 822                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 823                         up_read(&mp->m_peraglock);
 824                         if (error) {
 825                                 /*
 826                                  * If we can't read the AGI of this ag,
 827                                  * then just skip to the next one.
 828                                  */
 829                                 ASSERT(cur == NULL);
 830                                 agbp = NULL;
 831                                 agno++;
 832                                 agino = 0;
 833                                 continue;
 834                         }
 835                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 836                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 837                         if (error) {
 838                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 839                                 cur = NULL;
 840                                 xfs_buf_relse(agbp);
 841                                 agbp = NULL;
 842                                 /*
 843                                  * Move up the last inode in the current
 844                                  * chunk.  The lookup_ge will always get
 845                                  * us the first inode in the next chunk.
 846                                  */
 847                                 agino += XFS_INODES_PER_CHUNK - 1;
 848                                 continue;
 849                         }
 850                 }
 851                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 852                         &i)) ||
 853                     i == 0) {
 854                         xfs_buf_relse(agbp);
 855                         agbp = NULL;
 856                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 857                         cur = NULL;
 858                         agno++;
 859                         agino = 0;
 860                         continue;
 861                 }
 862                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 863                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 864                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 865                 buffer[bufidx].xi_allocmask = ~gfree;
 866                 bufidx++;
 867                 left--;
 868                 if (bufidx == bcount) {
 869                         long written;
 870                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 871                                 error = XFS_ERROR(EFAULT);
 872                                 break;
 873                         }
 874                         ubuffer += written;
 875                         *count += bufidx;
 876                         bufidx = 0;
 877                 }
 878                 if (left) {
 879                         error = xfs_btree_increment(cur, 0, &tmp);
 880                         if (error) {
 881                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 882                                 cur = NULL;
 883                                 xfs_buf_relse(agbp);
 884                                 agbp = NULL;
 885                                 /*
 886                                  * The agino value has already been bumped.
 887                                  * Just try to skip up to it.
 888                                  */
 889                                 agino += XFS_INODES_PER_CHUNK;
 890                                 continue;
 891                         }
 892                 }
 893         }
 894         if (!error) {
 895                 if (bufidx) {
 896                         long written;
 897                         if (formatter(ubuffer, buffer, bufidx, &written))
 898                                 error = XFS_ERROR(EFAULT);
 899                         else
 900                                 *count += bufidx;
 901                 }
 902                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 903         }
 904         kmem_free(buffer);
 905         if (cur)
 906                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 907                                            XFS_BTREE_NOERROR));
 908         if (agbp)
 909                 xfs_buf_relse(agbp);
 910         return error;
 911 }