fs/xfs/xfs_itable.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_error.h"
  40 #include "xfs_btree.h"
  41
  42 STATIC int
  43 xfs_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         struct inode    *inode;
  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_imap.im_blkno != 0);
  74
  75         dic = &ip->i_d;
  76         inode = VFS_I(ip);
  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
  89         /*
  90          * We need to read the timestamps from the Linux inode because
  91          * the VFS keeps writing directly into the inode structure instead
  92          * of telling us about the updates.
  93          */
  94         buf->bs_atime.tv_sec = inode->i_atime.tv_sec;
  95         buf->bs_atime.tv_nsec = inode->i_atime.tv_nsec;
  96         buf->bs_mtime.tv_sec = inode->i_mtime.tv_sec;
  97         buf->bs_mtime.tv_nsec = inode->i_mtime.tv_nsec;
  98         buf->bs_ctime.tv_sec = inode->i_ctime.tv_sec;
  99         buf->bs_ctime.tv_nsec = inode->i_ctime.tv_nsec;
 100
 101         buf->bs_xflags = xfs_ip2xflags(ip);
 102         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
 103         buf->bs_extents = dic->di_nextents;
 104         buf->bs_gen = dic->di_gen;
 105         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 106         buf->bs_dmevmask = dic->di_dmevmask;
 107         buf->bs_dmstate = dic->di_dmstate;
 108         buf->bs_aextents = dic->di_anextents;
 109
 110         switch (dic->di_format) {
 111         case XFS_DINODE_FMT_DEV:
 112                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 113                 buf->bs_blksize = BLKDEV_IOSIZE;
 114                 buf->bs_blocks = 0;
 115                 break;
 116         case XFS_DINODE_FMT_LOCAL:
 117         case XFS_DINODE_FMT_UUID:
 118                 buf->bs_rdev = 0;
 119                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 120                 buf->bs_blocks = 0;
 121                 break;
 122         case XFS_DINODE_FMT_EXTENTS:
 123         case XFS_DINODE_FMT_BTREE:
 124                 buf->bs_rdev = 0;
 125                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 126                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 127                 break;
 128         }
 129
 130         xfs_iput(ip, XFS_ILOCK_SHARED);
 131         return error;
 132 }
 133
 134 STATIC void
 135 xfs_bulkstat_one_dinode(
 136         xfs_mount_t     *mp,            /* mount point for filesystem */
 137         xfs_ino_t       ino,            /* inode number to get data for */
 138         xfs_dinode_t    *dic,           /* dinode inode pointer */
 139         xfs_bstat_t     *buf)           /* return buffer */
 140 {
 141         /*
 142          * The inode format changed when we moved the link count and
 143          * made it 32 bits long.  If this is an old format inode,
 144          * convert it in memory to look like a new one.  If it gets
 145          * flushed to disk we will convert back before flushing or
 146          * logging it.  We zero out the new projid field and the old link
 147          * count field.  We'll handle clearing the pad field (the remains
 148          * of the old uuid field) when we actually convert the inode to
 149          * the new format. We don't change the version number so that we
 150          * can distinguish this from a real new format inode.
 151          */
 152         if (dic->di_version == 1) {
 153                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 154                 buf->bs_projid = 0;
 155         } else {
 156                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 157                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 158         }
 159
 160         buf->bs_ino = ino;
 161         buf->bs_mode = be16_to_cpu(dic->di_mode);
 162         buf->bs_uid = be32_to_cpu(dic->di_uid);
 163         buf->bs_gid = be32_to_cpu(dic->di_gid);
 164         buf->bs_size = be64_to_cpu(dic->di_size);
 165         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 166         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 167         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 168         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 169         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 170         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 171         buf->bs_xflags = xfs_dic2xflags(dic);
 172         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 173         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 174         buf->bs_gen = be32_to_cpu(dic->di_gen);
 175         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 176         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 177         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 178         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 179
 180         switch (dic->di_format) {
 181         case XFS_DINODE_FMT_DEV:
 182                 buf->bs_rdev = xfs_dinode_get_rdev(dic);
 183                 buf->bs_blksize = BLKDEV_IOSIZE;
 184                 buf->bs_blocks = 0;
 185                 break;
 186         case XFS_DINODE_FMT_LOCAL:
 187         case XFS_DINODE_FMT_UUID:
 188                 buf->bs_rdev = 0;
 189                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 190                 buf->bs_blocks = 0;
 191                 break;
 192         case XFS_DINODE_FMT_EXTENTS:
 193         case XFS_DINODE_FMT_BTREE:
 194                 buf->bs_rdev = 0;
 195                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 196                 buf->bs_blocks = be64_to_cpu(dic->di_nblocks);
 197                 break;
 198         }
 199 }
 200
 201 /* Return 0 on success or positive error */
 202 STATIC int
 203 xfs_bulkstat_one_fmt(
 204         void                    __user *ubuffer,
 205         int                     ubsize,
 206         int                     *ubused,
 207         const xfs_bstat_t       *buffer)
 208 {
 209         if (ubsize < sizeof(*buffer))
 210                 return XFS_ERROR(ENOMEM);
 211         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 212                 return XFS_ERROR(EFAULT);
 213         if (ubused)
 214                 *ubused = sizeof(*buffer);
 215         return 0;
 216 }
 217
 218 /*
 219  * Return stat information for one inode.
 220  * Return 0 if ok, else errno.
 221  */
 222 int                                     /* error status */
 223 xfs_bulkstat_one_int(
 224         xfs_mount_t     *mp,            /* mount point for filesystem */
 225         xfs_ino_t       ino,            /* inode number to get data for */
 226         void            __user *buffer, /* buffer to place output in */
 227         int             ubsize,         /* size of buffer */
 228         bulkstat_one_fmt_pf formatter,  /* formatter, copy to user */
 229         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 230         int             *ubused,        /* bytes used by me */
 231         void            *dibuff,        /* on-disk inode buffer */
 232         int             *stat)          /* BULKSTAT_RV_... */
 233 {
 234         xfs_bstat_t     *buf;           /* return buffer */
 235         int             error = 0;      /* error value */
 236         xfs_dinode_t    *dip;           /* dinode inode pointer */
 237
 238         dip = (xfs_dinode_t *)dibuff;
 239         *stat = BULKSTAT_RV_NOTHING;
 240
 241         if (!buffer || xfs_internal_inum(mp, ino))
 242                 return XFS_ERROR(EINVAL);
 243
 244         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 245
 246         if (dip == NULL) {
 247                 /* We're not being passed a pointer to a dinode.  This happens
 248                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 249                  */
 250                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 251                 if (error)
 252                         goto out_free;
 253         } else {
 254                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 255         }
 256
 257         error = formatter(buffer, ubsize, ubused, buf);
 258         if (error)
 259                 goto out_free;
 260
 261         *stat = BULKSTAT_RV_DIDONE;
 262
 263  out_free:
 264         kmem_free(buf);
 265         return error;
 266 }
 267
 268 int
 269 xfs_bulkstat_one(
 270         xfs_mount_t     *mp,            /* mount point for filesystem */
 271         xfs_ino_t       ino,            /* inode number to get data for */
 272         void            __user *buffer, /* buffer to place output in */
 273         int             ubsize,         /* size of buffer */
 274         void            *private_data,  /* my private data */
 275         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 276         int             *ubused,        /* bytes used by me */
 277         void            *dibuff,        /* on-disk inode buffer */
 278         int             *stat)          /* BULKSTAT_RV_... */
 279 {
 280         return xfs_bulkstat_one_int(mp, ino, buffer, ubsize,
 281                                     xfs_bulkstat_one_fmt, bno,
 282                                     ubused, dibuff, stat);
 283 }
 284
 285 /*
 286  * Test to see whether we can use the ondisk inode directly, based
 287  * on the given bulkstat flags, filling in dipp accordingly.
 288  * Returns zero if the inode is dodgey.
 289  */
 290 STATIC int
 291 xfs_bulkstat_use_dinode(
 292         xfs_mount_t     *mp,
 293         int             flags,
 294         xfs_buf_t       *bp,
 295         int             clustidx,
 296         xfs_dinode_t    **dipp)
 297 {
 298         xfs_dinode_t    *dip;
 299         unsigned int    aformat;
 300
 301         *dipp = NULL;
 302         if (!bp || (flags & BULKSTAT_FG_IGET))
 303                 return 1;
 304         dip = (xfs_dinode_t *)
 305                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 306         /*
 307          * Check the buffer containing the on-disk inode for di_mode == 0.
 308          * This is to prevent xfs_bulkstat from picking up just reclaimed
 309          * inodes that have their in-core state initialized but not flushed
 310          * to disk yet. This is a temporary hack that would require a proper
 311          * fix in the future.
 312          */
 313         if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC ||
 314             !XFS_DINODE_GOOD_VERSION(dip->di_version) ||
 315             !dip->di_mode)
 316                 return 0;
 317         if (flags & BULKSTAT_FG_QUICK) {
 318                 *dipp = dip;
 319                 return 1;
 320         }
 321         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 322         aformat = dip->di_aformat;
 323         if ((XFS_DFORK_Q(dip) == 0) ||
 324             (aformat == XFS_DINODE_FMT_LOCAL) ||
 325             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_anextents)) {
 326                 *dipp = dip;
 327                 return 1;
 328         }
 329         return 1;
 330 }
 331
 332 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 333
 334 /*
 335  * Return stat information in bulk (by-inode) for the filesystem.
 336  */
 337 int                                     /* error status */
 338 xfs_bulkstat(
 339         xfs_mount_t             *mp,    /* mount point for filesystem */
 340         xfs_ino_t               *lastinop, /* last inode returned */
 341         int                     *ubcountp, /* size of buffer/count returned */
 342         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 343         void                    *private_data,/* private data for formatter */
 344         size_t                  statstruct_size, /* sizeof struct filling */
 345         char                    __user *ubuffer, /* buffer with inode stats */
 346         int                     flags,  /* defined in xfs_itable.h */
 347         int                     *done)  /* 1 if there are more stats to get */
 348 {
 349         xfs_agblock_t           agbno=0;/* allocation group block number */
 350         xfs_buf_t               *agbp;  /* agi header buffer */
 351         xfs_agi_t               *agi;   /* agi header data */
 352         xfs_agino_t             agino;  /* inode # in allocation group */
 353         xfs_agnumber_t          agno;   /* allocation group number */
 354         xfs_daddr_t             bno;    /* inode cluster start daddr */
 355         int                     chunkidx; /* current index into inode chunk */
 356         int                     clustidx; /* current index into inode cluster */
 357         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 358         int                     end_of_ag; /* set if we've seen the ag end */
 359         int                     error;  /* error code */
 360         int                     fmterror;/* bulkstat formatter result */
 361         int                     i;      /* loop index */
 362         int                     icount; /* count of inodes good in irbuf */
 363         size_t                  irbsize; /* size of irec buffer in bytes */
 364         xfs_ino_t               ino;    /* inode number (filesystem) */
 365         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 366         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 367         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 368         xfs_ino_t               lastino; /* last inode number returned */
 369         int                     nbcluster; /* # of blocks in a cluster */
 370         int                     nicluster; /* # of inodes in a cluster */
 371         int                     nimask; /* mask for inode clusters */
 372         int                     nirbuf; /* size of irbuf */
 373         int                     rval;   /* return value error code */
 374         int                     tmp;    /* result value from btree calls */
 375         int                     ubcount; /* size of user's buffer */
 376         int                     ubleft; /* bytes left in user's buffer */
 377         char                    __user *ubufp;  /* pointer into user's buffer */
 378         int                     ubelem; /* spaces used in user's buffer */
 379         int                     ubused; /* bytes used by formatter */
 380         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 381         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 382
 383         /*
 384          * Get the last inode value, see if there's nothing to do.
 385          */
 386         ino = (xfs_ino_t)*lastinop;
 387         lastino = ino;
 388         dip = NULL;
 389         agno = XFS_INO_TO_AGNO(mp, ino);
 390         agino = XFS_INO_TO_AGINO(mp, ino);
 391         if (agno >= mp->m_sb.sb_agcount ||
 392             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 393                 *done = 1;
 394                 *ubcountp = 0;
 395                 return 0;
 396         }
 397         if (!ubcountp || *ubcountp <= 0) {
 398                 return EINVAL;
 399         }
 400         ubcount = *ubcountp; /* statstruct's */
 401         ubleft = ubcount * statstruct_size; /* bytes */
 402         *ubcountp = ubelem = 0;
 403         *done = 0;
 404         fmterror = 0;
 405         ubufp = ubuffer;
 406         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 407                 mp->m_sb.sb_inopblock :
 408                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 409         nimask = ~(nicluster - 1);
 410         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 411         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 412                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 413         nirbuf = irbsize / sizeof(*irbuf);
 414
 415         /*
 416          * Loop over the allocation groups, starting from the last
 417          * inode returned; 0 means start of the allocation group.
 418          */
 419         rval = 0;
 420         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 421                 cond_resched();
 422                 bp = NULL;
 423                 down_read(&mp->m_peraglock);
 424                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 425                 up_read(&mp->m_peraglock);
 426                 if (error) {
 427                         /*
 428                          * Skip this allocation group and go to the next one.
 429                          */
 430                         agno++;
 431                         agino = 0;
 432                         continue;
 433                 }
 434                 agi = XFS_BUF_TO_AGI(agbp);
 435                 /*
 436                  * Allocate and initialize a btree cursor for ialloc btree.
 437                  */
 438                 cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 439                 irbp = irbuf;
 440                 irbufend = irbuf + nirbuf;
 441                 end_of_ag = 0;
 442                 /*
 443                  * If we're returning in the middle of an allocation group,
 444                  * we need to get the remainder of the chunk we're in.
 445                  */
 446                 if (agino > 0) {
 447                         xfs_inobt_rec_incore_t r;
 448
 449                         /*
 450                          * Lookup the inode chunk that this inode lives in.
 451                          */
 452                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE,
 453                                                  &tmp);
 454                         if (!error &&   /* no I/O error */
 455                             tmp &&      /* lookup succeeded */
 456                                         /* got the record, should always work */
 457                             !(error = xfs_inobt_get_rec(cur, &r, &i)) &&
 458                             i == 1 &&
 459                                         /* this is the right chunk */
 460                             agino < r.ir_startino + XFS_INODES_PER_CHUNK &&
 461                                         /* lastino was not last in chunk */
 462                             (chunkidx = agino - r.ir_startino + 1) <
 463                                     XFS_INODES_PER_CHUNK &&
 464                                         /* there are some left allocated */
 465                             xfs_inobt_maskn(chunkidx,
 466                                     XFS_INODES_PER_CHUNK - chunkidx) &
 467                                     ~r.ir_free) {
 468                                 /*
 469                                  * Grab the chunk record.  Mark all the
 470                                  * uninteresting inodes (because they're
 471                                  * before our start point) free.
 472                                  */
 473                                 for (i = 0; i < chunkidx; i++) {
 474                                         if (XFS_INOBT_MASK(i) & ~r.ir_free)
 475                                                 r.ir_freecount++;
 476                                 }
 477                                 r.ir_free |= xfs_inobt_maskn(0, chunkidx);
 478                                 irbp->ir_startino = r.ir_startino;
 479                                 irbp->ir_freecount = r.ir_freecount;
 480                                 irbp->ir_free = r.ir_free;
 481                                 irbp++;
 482                                 agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 483                                 icount = XFS_INODES_PER_CHUNK - r.ir_freecount;
 484                         } else {
 485                                 /*
 486                                  * If any of those tests failed, bump the
 487                                  * inode number (just in case).
 488                                  */
 489                                 agino++;
 490                                 icount = 0;
 491                         }
 492                         /*
 493                          * In any case, increment to the next record.
 494                          */
 495                         if (!error)
 496                                 error = xfs_btree_increment(cur, 0, &tmp);
 497                 } else {
 498                         /*
 499                          * Start of ag.  Lookup the first inode chunk.
 500                          */
 501                         error = xfs_inobt_lookup(cur, 0, XFS_LOOKUP_GE, &tmp);
 502                         icount = 0;
 503                 }
 504                 /*
 505                  * Loop through inode btree records in this ag,
 506                  * until we run out of inodes or space in the buffer.
 507                  */
 508                 while (irbp < irbufend && icount < ubcount) {
 509                         xfs_inobt_rec_incore_t r;
 510
 511                         /*
 512                          * Loop as long as we're unable to read the
 513                          * inode btree.
 514                          */
 515                         while (error) {
 516                                 agino += XFS_INODES_PER_CHUNK;
 517                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 518                                                 be32_to_cpu(agi->agi_length))
 519                                         break;
 520                                 error = xfs_inobt_lookup(cur, agino,
 521                                                          XFS_LOOKUP_GE, &tmp);
 522                                 cond_resched();
 523                         }
 524                         /*
 525                          * If ran off the end of the ag either with an error,
 526                          * or the normal way, set end and stop collecting.
 527                          */
 528                         if (error) {
 529                                 end_of_ag = 1;
 530                                 break;
 531                         }
 532
 533                         error = xfs_inobt_get_rec(cur, &r, &i);
 534                         if (error || i == 0) {
 535                                 end_of_ag = 1;
 536                                 break;
 537                         }
 538
 539                         /*
 540                          * If this chunk has any allocated inodes, save it.
 541                          * Also start read-ahead now for this chunk.
 542                          */
 543                         if (r.ir_freecount < XFS_INODES_PER_CHUNK) {
 544                                 /*
 545                                  * Loop over all clusters in the next chunk.
 546                                  * Do a readahead if there are any allocated
 547                                  * inodes in that cluster.
 548                                  */
 549                                 agbno = XFS_AGINO_TO_AGBNO(mp, r.ir_startino);
 550                                 for (chunkidx = 0;
 551                                      chunkidx < XFS_INODES_PER_CHUNK;
 552                                      chunkidx += nicluster,
 553                                      agbno += nbcluster) {
 554                                         if (xfs_inobt_maskn(chunkidx, nicluster)
 555                                                         & ~r.ir_free)
 556                                                 xfs_btree_reada_bufs(mp, agno,
 557                                                         agbno, nbcluster);
 558                                 }
 559                                 irbp->ir_startino = r.ir_startino;
 560                                 irbp->ir_freecount = r.ir_freecount;
 561                                 irbp->ir_free = r.ir_free;
 562                                 irbp++;
 563                                 icount += XFS_INODES_PER_CHUNK - r.ir_freecount;
 564                         }
 565                         /*
 566                          * Set agino to after this chunk and bump the cursor.
 567                          */
 568                         agino = r.ir_startino + XFS_INODES_PER_CHUNK;
 569                         error = xfs_btree_increment(cur, 0, &tmp);
 570                         cond_resched();
 571                 }
 572                 /*
 573                  * Drop the btree buffers and the agi buffer.
 574                  * We can't hold any of the locks these represent
 575                  * when calling iget.
 576                  */
 577                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 578                 xfs_buf_relse(agbp);
 579                 /*
 580                  * Now format all the good inodes into the user's buffer.
 581                  */
 582                 irbufend = irbp;
 583                 for (irbp = irbuf;
 584                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 585                         /*
 586                          * Now process this chunk of inodes.
 587                          */
 588                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 589                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 590                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 591                              chunkidx++, clustidx++, agino++) {
 592                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 593                                 /*
 594                                  * Recompute agbno if this is the
 595                                  * first inode of the cluster.
 596                                  *
 597                                  * Careful with clustidx.   There can be
 598                                  * multiple clusters per chunk, a single
 599                                  * cluster per chunk or a cluster that has
 600                                  * inodes represented from several different
 601                                  * chunks (if blocksize is large).
 602                                  *
 603                                  * Because of this, the starting clustidx is
 604                                  * initialized to zero in this loop but must
 605                                  * later be reset after reading in the cluster
 606                                  * buffer.
 607                                  */
 608                                 if ((chunkidx & (nicluster - 1)) == 0) {
 609                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 610                                                         irbp->ir_startino) +
 611                                                 ((chunkidx & nimask) >>
 612                                                  mp->m_sb.sb_inopblog);
 613
 614                                         if (flags & (BULKSTAT_FG_QUICK |
 615                                                      BULKSTAT_FG_INLINE)) {
 616                                                 int offset;
 617
 618                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 619                                                                        agino);
 620                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 621                                                                        agbno);
 622
 623                                                 /*
 624                                                  * Get the inode cluster buffer
 625                                                  */
 626                                                 if (bp)
 627                                                         xfs_buf_relse(bp);
 628
 629                                                 error = xfs_inotobp(mp, NULL, ino, &dip,
 630                                                                     &bp, &offset,
 631                                                                     XFS_IGET_BULKSTAT);
 632
 633                                                 if (!error)
 634                                                         clustidx = offset / mp->m_sb.sb_inodesize;
 635                                                 if (XFS_TEST_ERROR(error != 0,
 636                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 637                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 638                                                         bp = NULL;
 639                                                         ubleft = 0;
 640                                                         rval = error;
 641                                                         break;
 642                                                 }
 643                                         }
 644                                 }
 645                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 646                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 647                                 /*
 648                                  * Skip if this inode is free.
 649                                  */
 650                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 651                                         lastino = ino;
 652                                         continue;
 653                                 }
 654                                 /*
 655                                  * Count used inodes as free so we can tell
 656                                  * when the chunk is used up.
 657                                  */
 658                                 irbp->ir_freecount++;
 659                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 660                                                              clustidx, &dip)) {
 661                                         lastino = ino;
 662                                         continue;
 663                                 }
 664                                 /*
 665                                  * If we need to do an iget, cannot hold bp.
 666                                  * Drop it, until starting the next cluster.
 667                                  */
 668                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 669                                         if (bp)
 670                                                 xfs_buf_relse(bp);
 671                                         bp = NULL;
 672                                 }
 673
 674                                 /*
 675                                  * Get the inode and fill in a single buffer.
 676                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 677                                  * BULKSTAT_FG_IGET uses igets.
 678                                  * BULKSTAT_FG_INLINE uses dip if we have an
 679                                  * inline attr fork, else igets.
 680                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 681                                  * This is also used to count inodes/blks, etc
 682                                  * in xfs_qm_quotacheck.
 683                                  */
 684                                 ubused = statstruct_size;
 685                                 error = formatter(mp, ino, ubufp,
 686                                                 ubleft, private_data,
 687                                                 bno, &ubused, dip, &fmterror);
 688                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 689                                         if (error && error != ENOENT &&
 690                                                 error != EINVAL) {
 691                                                 ubleft = 0;
 692                                                 rval = error;
 693                                                 break;
 694                                         }
 695                                         lastino = ino;
 696                                         continue;
 697                                 }
 698                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 699                                         ubleft = 0;
 700                                         ASSERT(error);
 701                                         rval = error;
 702                                         break;
 703                                 }
 704                                 if (ubufp)
 705                                         ubufp += ubused;
 706                                 ubleft -= ubused;
 707                                 ubelem++;
 708                                 lastino = ino;
 709                         }
 710
 711                         cond_resched();
 712                 }
 713
 714                 if (bp)
 715                         xfs_buf_relse(bp);
 716
 717                 /*
 718                  * Set up for the next loop iteration.
 719                  */
 720                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 721                         if (end_of_ag) {
 722                                 agno++;
 723                                 agino = 0;
 724                         } else
 725                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 726                 } else
 727                         break;
 728         }
 729         /*
 730          * Done, we're either out of filesystem or space to put the data.
 731          */
 732         kmem_free(irbuf);
 733         *ubcountp = ubelem;
 734         /*
 735          * Found some inodes, return them now and return the error next time.
 736          */
 737         if (ubelem)
 738                 rval = 0;
 739         if (agno >= mp->m_sb.sb_agcount) {
 740                 /*
 741                  * If we ran out of filesystem, mark lastino as off
 742                  * the end of the filesystem, so the next call
 743                  * will return immediately.
 744                  */
 745                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 746                 *done = 1;
 747         } else
 748                 *lastinop = (xfs_ino_t)lastino;
 749
 750         return rval;
 751 }
 752
 753 /*
 754  * Return stat information in bulk (by-inode) for the filesystem.
 755  * Special case for non-sequential one inode bulkstat.
 756  */
 757 int                                     /* error status */
 758 xfs_bulkstat_single(
 759         xfs_mount_t             *mp,    /* mount point for filesystem */
 760         xfs_ino_t               *lastinop, /* inode to return */
 761         char                    __user *buffer, /* buffer with inode stats */
 762         int                     *done)  /* 1 if there are more stats to get */
 763 {
 764         int                     count;  /* count value for bulkstat call */
 765         int                     error;  /* return value */
 766         xfs_ino_t               ino;    /* filesystem inode number */
 767         int                     res;    /* result from bs1 */
 768
 769         /*
 770          * note that requesting valid inode numbers which are not allocated
 771          * to inodes will most likely cause xfs_itobp to generate warning
 772          * messages about bad magic numbers. This is ok. The fact that
 773          * the inode isn't actually an inode is handled by the
 774          * error check below. Done this way to make the usual case faster
 775          * at the expense of the error case.
 776          */
 777
 778         ino = (xfs_ino_t)*lastinop;
 779         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 780                                  NULL, 0, NULL, NULL, &res);
 781         if (error) {
 782                 /*
 783                  * Special case way failed, do it the "long" way
 784                  * to see if that works.
 785                  */
 786                 (*lastinop)--;
 787                 count = 1;
 788                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 789                                 NULL, sizeof(xfs_bstat_t), buffer,
 790                                 BULKSTAT_FG_IGET, done))
 791                         return error;
 792                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 793                         return error == EFSCORRUPTED ?
 794                                 XFS_ERROR(EINVAL) : error;
 795                 else
 796                         return 0;
 797         }
 798         *done = 0;
 799         return 0;
 800 }
 801
 802 int
 803 xfs_inumbers_fmt(
 804         void                    __user *ubuffer, /* buffer to write to */
 805         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 806         long                    count,          /* # of elements to read */
 807         long                    *written)       /* # of bytes written */
 808 {
 809         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 810                 return -EFAULT;
 811         *written = count * sizeof(*buffer);
 812         return 0;
 813 }
 814
 815 /*
 816  * Return inode number table for the filesystem.
 817  */
 818 int                                     /* error status */
 819 xfs_inumbers(
 820         xfs_mount_t     *mp,            /* mount point for filesystem */
 821         xfs_ino_t       *lastino,       /* last inode returned */
 822         int             *count,         /* size of buffer/count returned */
 823         void            __user *ubuffer,/* buffer with inode descriptions */
 824         inumbers_fmt_pf formatter)
 825 {
 826         xfs_buf_t       *agbp;
 827         xfs_agino_t     agino;
 828         xfs_agnumber_t  agno;
 829         int             bcount;
 830         xfs_inogrp_t    *buffer;
 831         int             bufidx;
 832         xfs_btree_cur_t *cur;
 833         int             error;
 834         xfs_inobt_rec_incore_t r;
 835         int             i;
 836         xfs_ino_t       ino;
 837         int             left;
 838         int             tmp;
 839
 840         ino = (xfs_ino_t)*lastino;
 841         agno = XFS_INO_TO_AGNO(mp, ino);
 842         agino = XFS_INO_TO_AGINO(mp, ino);
 843         left = *count;
 844         *count = 0;
 845         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 846         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 847         error = bufidx = 0;
 848         cur = NULL;
 849         agbp = NULL;
 850         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 851                 if (agbp == NULL) {
 852                         down_read(&mp->m_peraglock);
 853                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 854                         up_read(&mp->m_peraglock);
 855                         if (error) {
 856                                 /*
 857                                  * If we can't read the AGI of this ag,
 858                                  * then just skip to the next one.
 859                                  */
 860                                 ASSERT(cur == NULL);
 861                                 agbp = NULL;
 862                                 agno++;
 863                                 agino = 0;
 864                                 continue;
 865                         }
 866                         cur = xfs_inobt_init_cursor(mp, NULL, agbp, agno);
 867                         error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_GE,
 868                                                  &tmp);
 869                         if (error) {
 870                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 871                                 cur = NULL;
 872                                 xfs_buf_relse(agbp);
 873                                 agbp = NULL;
 874                                 /*
 875                                  * Move up the last inode in the current
 876                                  * chunk.  The lookup_ge will always get
 877                                  * us the first inode in the next chunk.
 878                                  */
 879                                 agino += XFS_INODES_PER_CHUNK - 1;
 880                                 continue;
 881                         }
 882                 }
 883                 error = xfs_inobt_get_rec(cur, &r, &i);
 884                 if (error || i == 0) {
 885                         xfs_buf_relse(agbp);
 886                         agbp = NULL;
 887                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 888                         cur = NULL;
 889                         agno++;
 890                         agino = 0;
 891                         continue;
 892                 }
 893                 agino = r.ir_startino + XFS_INODES_PER_CHUNK - 1;
 894                 buffer[bufidx].xi_startino =
 895                         XFS_AGINO_TO_INO(mp, agno, r.ir_startino);
 896                 buffer[bufidx].xi_alloccount =
 897                         XFS_INODES_PER_CHUNK - r.ir_freecount;
 898                 buffer[bufidx].xi_allocmask = ~r.ir_free;
 899                 bufidx++;
 900                 left--;
 901                 if (bufidx == bcount) {
 902                         long written;
 903                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 904                                 error = XFS_ERROR(EFAULT);
 905                                 break;
 906                         }
 907                         ubuffer += written;
 908                         *count += bufidx;
 909                         bufidx = 0;
 910                 }
 911                 if (left) {
 912                         error = xfs_btree_increment(cur, 0, &tmp);
 913                         if (error) {
 914                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 915                                 cur = NULL;
 916                                 xfs_buf_relse(agbp);
 917                                 agbp = NULL;
 918                                 /*
 919                                  * The agino value has already been bumped.
 920                                  * Just try to skip up to it.
 921                                  */
 922                                 agino += XFS_INODES_PER_CHUNK;
 923                                 continue;
 924                         }
 925                 }
 926         }
 927         if (!error) {
 928                 if (bufidx) {
 929                         long written;
 930                         if (formatter(ubuffer, buffer, bufidx, &written))
 931                                 error = XFS_ERROR(EFAULT);
 932                         else
 933                                 *count += bufidx;
 934                 }
 935                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 936         }
 937         kmem_free(buffer);
 938         if (cur)
 939                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 940                                            XFS_BTREE_NOERROR));
 941         if (agbp)
 942                 xfs_buf_relse(agbp);
 943         return error;
 944 }