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