sys/gnu/fs/xfs/xfs_itable.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir.h"
  28 #include "xfs_dir2.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_bmap_btree.h"
  32 #include "xfs_alloc_btree.h"
  33 #include "xfs_ialloc_btree.h"
  34 #include "xfs_dir_sf.h"
  35 #include "xfs_dir2_sf.h"
  36 #include "xfs_attr_sf.h"
  37 #include "xfs_dinode.h"
  38 #include "xfs_inode.h"
  39 #include "xfs_ialloc.h"
  40 #include "xfs_itable.h"
  41 #include "xfs_error.h"
  42 #include "xfs_btree.h"
  43
  44 #ifndef HAVE_USERACC
  45 #define useracc(ubuffer, size, flags, foo) (0)
  46 #define unuseracc(ubuffer, size, flags)
  47 #endif
  48
  49 STATIC int
  50 xfs_bulkstat_one_iget(
  51         xfs_mount_t     *mp,            /* mount point for filesystem */
  52         xfs_ino_t       ino,            /* inode number to get data for */
  53         xfs_daddr_t     bno,            /* starting bno of inode cluster */
  54         xfs_bstat_t     *buf,           /* return buffer */
  55         int             *stat)          /* BULKSTAT_RV_... */
  56 {
  57         xfs_dinode_core_t *dic;         /* dinode core info pointer */
  58         xfs_inode_t     *ip;            /* incore inode pointer */
  59         xfs_vnode_t     *vp;
  60         int             error;
  61
  62         error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_SHARED, &ip, bno);
  63         if (error) {
  64                 *stat = BULKSTAT_RV_NOTHING;
  65                 return error;
  66         }
  67
  68         ASSERT(ip != NULL);
  69         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  70         if (ip->i_d.di_mode == 0) {
  71                 *stat = BULKSTAT_RV_NOTHING;
  72                 error = XFS_ERROR(ENOENT);
  73                 goto out_iput;
  74         }
  75
  76         vp = XFS_ITOV(ip);
  77         dic = &ip->i_d;
  78
  79         /* xfs_iget returns the following without needing
  80          * further change.
  81          */
  82         buf->bs_nlink = dic->di_nlink;
  83         buf->bs_projid = dic->di_projid;
  84         buf->bs_ino = ino;
  85         buf->bs_mode = dic->di_mode;
  86         buf->bs_uid = dic->di_uid;
  87         buf->bs_gid = dic->di_gid;
  88         buf->bs_size = dic->di_size;
  89         vn_atime_to_bstime(vp, &buf->bs_atime);
  90         buf->bs_mtime.tv_sec = dic->di_mtime.t_sec;
  91         buf->bs_mtime.tv_nsec = dic->di_mtime.t_nsec;
  92         buf->bs_ctime.tv_sec = dic->di_ctime.t_sec;
  93         buf->bs_ctime.tv_nsec = dic->di_ctime.t_nsec;
  94         buf->bs_xflags = xfs_ip2xflags(ip);
  95         buf->bs_extsize = dic->di_extsize << mp->m_sb.sb_blocklog;
  96         buf->bs_extents = dic->di_nextents;
  97         buf->bs_gen = dic->di_gen;
  98         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
  99         buf->bs_dmevmask = dic->di_dmevmask;
 100         buf->bs_dmstate = dic->di_dmstate;
 101         buf->bs_aextents = dic->di_anextents;
 102
 103         switch (dic->di_format) {
 104         case XFS_DINODE_FMT_DEV:
 105                 buf->bs_rdev = ip->i_df.if_u2.if_rdev;
 106                 buf->bs_blksize = BLKDEV_IOSIZE;
 107                 buf->bs_blocks = 0;
 108                 break;
 109         case XFS_DINODE_FMT_LOCAL:
 110         case XFS_DINODE_FMT_UUID:
 111                 buf->bs_rdev = 0;
 112                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 113                 buf->bs_blocks = 0;
 114                 break;
 115         case XFS_DINODE_FMT_EXTENTS:
 116         case XFS_DINODE_FMT_BTREE:
 117                 buf->bs_rdev = 0;
 118                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 119                 buf->bs_blocks = dic->di_nblocks + ip->i_delayed_blks;
 120                 break;
 121         }
 122
 123  out_iput:
 124         xfs_iput(ip, XFS_ILOCK_SHARED);
 125         return error;
 126 }
 127
 128 STATIC int
 129 xfs_bulkstat_one_dinode(
 130         xfs_mount_t     *mp,            /* mount point for filesystem */
 131         xfs_ino_t       ino,            /* inode number to get data for */
 132         xfs_dinode_t    *dip,           /* dinode inode pointer */
 133         xfs_bstat_t     *buf)           /* return buffer */
 134 {
 135         xfs_dinode_core_t *dic;         /* dinode core info pointer */
 136
 137         dic = &dip->di_core;
 138
 139         /*
 140          * The inode format changed when we moved the link count and
 141          * made it 32 bits long.  If this is an old format inode,
 142          * convert it in memory to look like a new one.  If it gets
 143          * flushed to disk we will convert back before flushing or
 144          * logging it.  We zero out the new projid field and the old link
 145          * count field.  We'll handle clearing the pad field (the remains
 146          * of the old uuid field) when we actually convert the inode to
 147          * the new format. We don't change the version number so that we
 148          * can distinguish this from a real new format inode.
 149          */
 150         if (INT_GET(dic->di_version, ARCH_CONVERT) == XFS_DINODE_VERSION_1) {
 151                 buf->bs_nlink = INT_GET(dic->di_onlink, ARCH_CONVERT);
 152                 buf->bs_projid = 0;
 153         } else {
 154                 buf->bs_nlink = INT_GET(dic->di_nlink, ARCH_CONVERT);
 155                 buf->bs_projid = INT_GET(dic->di_projid, ARCH_CONVERT);
 156         }
 157
 158         buf->bs_ino = ino;
 159         buf->bs_mode = INT_GET(dic->di_mode, ARCH_CONVERT);
 160         buf->bs_uid = INT_GET(dic->di_uid, ARCH_CONVERT);
 161         buf->bs_gid = INT_GET(dic->di_gid, ARCH_CONVERT);
 162         buf->bs_size = INT_GET(dic->di_size, ARCH_CONVERT);
 163         buf->bs_atime.tv_sec = INT_GET(dic->di_atime.t_sec, ARCH_CONVERT);
 164         buf->bs_atime.tv_nsec = INT_GET(dic->di_atime.t_nsec, ARCH_CONVERT);
 165         buf->bs_mtime.tv_sec = INT_GET(dic->di_mtime.t_sec, ARCH_CONVERT);
 166         buf->bs_mtime.tv_nsec = INT_GET(dic->di_mtime.t_nsec, ARCH_CONVERT);
 167         buf->bs_ctime.tv_sec = INT_GET(dic->di_ctime.t_sec, ARCH_CONVERT);
 168         buf->bs_ctime.tv_nsec = INT_GET(dic->di_ctime.t_nsec, ARCH_CONVERT);
 169         buf->bs_xflags = xfs_dic2xflags(dic);
 170         buf->bs_extsize = INT_GET(dic->di_extsize, ARCH_CONVERT) << mp->m_sb.sb_blocklog;
 171         buf->bs_extents = INT_GET(dic->di_nextents, ARCH_CONVERT);
 172         buf->bs_gen = INT_GET(dic->di_gen, ARCH_CONVERT);
 173         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 174         buf->bs_dmevmask = INT_GET(dic->di_dmevmask, ARCH_CONVERT);
 175         buf->bs_dmstate = INT_GET(dic->di_dmstate, ARCH_CONVERT);
 176         buf->bs_aextents = INT_GET(dic->di_anextents, ARCH_CONVERT);
 177
 178         switch (INT_GET(dic->di_format, ARCH_CONVERT)) {
 179         case XFS_DINODE_FMT_DEV:
 180                 buf->bs_rdev = INT_GET(dip->di_u.di_dev, ARCH_CONVERT);
 181                 buf->bs_blksize = BLKDEV_IOSIZE;
 182                 buf->bs_blocks = 0;
 183                 break;
 184         case XFS_DINODE_FMT_LOCAL:
 185         case XFS_DINODE_FMT_UUID:
 186                 buf->bs_rdev = 0;
 187                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 188                 buf->bs_blocks = 0;
 189                 break;
 190         case XFS_DINODE_FMT_EXTENTS:
 191         case XFS_DINODE_FMT_BTREE:
 192                 buf->bs_rdev = 0;
 193                 buf->bs_blksize = mp->m_sb.sb_blocksize;
 194                 buf->bs_blocks = INT_GET(dic->di_nblocks, ARCH_CONVERT);
 195                 break;
 196         }
 197
 198         return 0;
 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
 221         dip = (xfs_dinode_t *)dibuff;
 222
 223         if (!buffer || ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
 224             (XFS_SB_VERSION_HASQUOTA(&mp->m_sb) &&
 225              (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino))) {
 226                 *stat = BULKSTAT_RV_NOTHING;
 227                 return XFS_ERROR(EINVAL);
 228         }
 229         if (ubsize < sizeof(*buf)) {
 230                 *stat = BULKSTAT_RV_NOTHING;
 231                 return XFS_ERROR(ENOMEM);
 232         }
 233
 234         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 235
 236         if (dip == NULL) {
 237                 /* We're not being passed a pointer to a dinode.  This happens
 238                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 239                  */
 240                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 241                 if (error)
 242                         goto out_free;
 243         } else {
 244                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 245         }
 246
 247         if (copy_to_user(buffer, buf, sizeof(*buf)))  {
 248                 *stat = BULKSTAT_RV_NOTHING;
 249                 error =  EFAULT;
 250                 goto out_free;
 251         }
 252
 253         *stat = BULKSTAT_RV_DIDONE;
 254         if (ubused)
 255                 *ubused = sizeof(*buf);
 256
 257  out_free:
 258         kmem_free(buf, sizeof(*buf));
 259         return error;
 260 }
 261
 262 /*
 263  * Return stat information in bulk (by-inode) for the filesystem.
 264  */
 265 int                                     /* error status */
 266 xfs_bulkstat(
 267         xfs_mount_t             *mp,    /* mount point for filesystem */
 268         xfs_ino_t               *lastinop, /* last inode returned */
 269         int                     *ubcountp, /* size of buffer/count returned */
 270         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 271         void                    *private_data,/* private data for formatter */
 272         size_t                  statstruct_size, /* sizeof struct filling */
 273         char                    __user *ubuffer, /* buffer with inode stats */
 274         int                     flags,  /* defined in xfs_itable.h */
 275         int                     *done)  /* 1 if there are more stats to get */
 276 {
 277         xfs_agblock_t           agbno=0;/* allocation group block number */
 278         xfs_buf_t               *agbp;  /* agi header buffer */
 279         xfs_agi_t               *agi;   /* agi header data */
 280         xfs_agino_t             agino;  /* inode # in allocation group */
 281         xfs_agnumber_t          agno;   /* allocation group number */
 282         xfs_daddr_t             bno;    /* inode cluster start daddr */
 283         int                     chunkidx; /* current index into inode chunk */
 284         int                     clustidx; /* current index into inode cluster */
 285         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 286         int                     end_of_ag; /* set if we've seen the ag end */
 287         int                     error;  /* error code */
 288         int                     fmterror;/* bulkstat formatter result */
 289         __int32_t               gcnt;   /* current btree rec's count */
 290         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 291         xfs_agino_t             gino;   /* current btree rec's start inode */
 292         int                     i;      /* loop index */
 293         int                     icount; /* count of inodes good in irbuf */
 294         xfs_ino_t               ino;    /* inode number (filesystem) */
 295         xfs_inobt_rec_t         *irbp;  /* current irec buffer pointer */
 296         xfs_inobt_rec_t         *irbuf; /* start of irec buffer */
 297         xfs_inobt_rec_t         *irbufend; /* end of good irec buffer entries */
 298         xfs_ino_t               lastino=0; /* last inode number returned */
 299         int                     nbcluster; /* # of blocks in a cluster */
 300         int                     nicluster; /* # of inodes in a cluster */
 301         int                     nimask; /* mask for inode clusters */
 302         int                     nirbuf; /* size of irbuf */
 303         int                     rval;   /* return value error code */
 304         int                     tmp;    /* result value from btree calls */
 305         int                     ubcount; /* size of user's buffer */
 306         int                     ubleft; /* bytes left in user's buffer */
 307         char                    __user *ubufp;  /* pointer into user's buffer */
 308         int                     ubelem; /* spaces used in user's buffer */
 309         int                     ubused; /* bytes used by formatter */
 310         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 311         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 312         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 313
 314         /*
 315          * Get the last inode value, see if there's nothing to do.
 316          */
 317         ino = (xfs_ino_t)*lastinop;
 318         dip = NULL;
 319         agno = XFS_INO_TO_AGNO(mp, ino);
 320         agino = XFS_INO_TO_AGINO(mp, ino);
 321         if (agno >= mp->m_sb.sb_agcount ||
 322             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 323                 *done = 1;
 324                 *ubcountp = 0;
 325                 return 0;
 326         }
 327         ubcount = *ubcountp; /* statstruct's */
 328         ubleft = ubcount * statstruct_size; /* bytes */
 329         *ubcountp = ubelem = 0;
 330         *done = 0;
 331         fmterror = 0;
 332         ubufp = ubuffer;
 333         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 334                 mp->m_sb.sb_inopblock :
 335                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 336         nimask = ~(nicluster - 1);
 337         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 338         /*
 339          * Lock down the user's buffer. If a buffer was not sent, as in the case
 340          * disk quota code calls here, we skip this.
 341          */
 342         if (ubuffer &&
 343             (error = useracc(ubuffer, ubcount * statstruct_size,
 344                         (B_READ|B_PHYS), NULL))) {
 345                 return error;
 346         }
 347         /*
 348          * Allocate a page-sized buffer for inode btree records.
 349          * We could try allocating something smaller, but for normal
 350          * calls we'll always (potentially) need the whole page.
 351          */
 352         irbuf = kmem_alloc(NBPC, KM_SLEEP);
 353         nirbuf = NBPC / sizeof(*irbuf);
 354         /*
 355          * Loop over the allocation groups, starting from the last
 356          * inode returned; 0 means start of the allocation group.
 357          */
 358         rval = 0;
 359         while (ubleft >= statstruct_size && agno < mp->m_sb.sb_agcount) {
 360                 bp = NULL;
 361                 down_read(&mp->m_peraglock);
 362                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 363                 up_read(&mp->m_peraglock);
 364                 if (error) {
 365                         /*
 366                          * Skip this allocation group and go to the next one.
 367                          */
 368                         agno++;
 369                         agino = 0;
 370                         continue;
 371                 }
 372                 agi = XFS_BUF_TO_AGI(agbp);
 373                 /*
 374                  * Allocate and initialize a btree cursor for ialloc btree.
 375                  */
 376                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 377                         (xfs_inode_t *)0, 0);
 378                 irbp = irbuf;
 379                 irbufend = irbuf + nirbuf;
 380                 end_of_ag = 0;
 381                 /*
 382                  * If we're returning in the middle of an allocation group,
 383                  * we need to get the remainder of the chunk we're in.
 384                  */
 385                 if (agino > 0) {
 386                         /*
 387                          * Lookup the inode chunk that this inode lives in.
 388                          */
 389                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 390                         if (!error &&   /* no I/O error */
 391                             tmp &&      /* lookup succeeded */
 392                                         /* got the record, should always work */
 393                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 394                                     &gfree, &i)) &&
 395                             i == 1 &&
 396                                         /* this is the right chunk */
 397                             agino < gino + XFS_INODES_PER_CHUNK &&
 398                                         /* lastino was not last in chunk */
 399                             (chunkidx = agino - gino + 1) <
 400                                     XFS_INODES_PER_CHUNK &&
 401                                         /* there are some left allocated */
 402                             XFS_INOBT_MASKN(chunkidx,
 403                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 404                                 /*
 405                                  * Grab the chunk record.  Mark all the
 406                                  * uninteresting inodes (because they're
 407                                  * before our start point) free.
 408                                  */
 409                                 for (i = 0; i < chunkidx; i++) {
 410                                         if (XFS_INOBT_MASK(i) & ~gfree)
 411                                                 gcnt++;
 412                                 }
 413                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 414                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
 415                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
 416                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
 417                                 irbp++;
 418                                 agino = gino + XFS_INODES_PER_CHUNK;
 419                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 420                         } else {
 421                                 /*
 422                                  * If any of those tests failed, bump the
 423                                  * inode number (just in case).
 424                                  */
 425                                 agino++;
 426                                 icount = 0;
 427                         }
 428                         /*
 429                          * In any case, increment to the next record.
 430                          */
 431                         if (!error)
 432                                 error = xfs_inobt_increment(cur, 0, &tmp);
 433                 } else {
 434                         /*
 435                          * Start of ag.  Lookup the first inode chunk.
 436                          */
 437                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 438                         icount = 0;
 439                 }
 440                 /*
 441                  * Loop through inode btree records in this ag,
 442                  * until we run out of inodes or space in the buffer.
 443                  */
 444                 while (irbp < irbufend && icount < ubcount) {
 445                         /*
 446                          * Loop as long as we're unable to read the
 447                          * inode btree.
 448                          */
 449                         while (error) {
 450                                 agino += XFS_INODES_PER_CHUNK;
 451                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 452                                                 be32_to_cpu(agi->agi_length))
 453                                         break;
 454                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 455                                                             &tmp);
 456                         }
 457                         /*
 458                          * If ran off the end of the ag either with an error,
 459                          * or the normal way, set end and stop collecting.
 460                          */
 461                         if (error ||
 462                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 463                                     &gfree, &i)) ||
 464                             i == 0) {
 465                                 end_of_ag = 1;
 466                                 break;
 467                         }
 468                         /*
 469                          * If this chunk has any allocated inodes, save it.
 470                          */
 471                         if (gcnt < XFS_INODES_PER_CHUNK) {
 472                                 INT_SET(irbp->ir_startino, ARCH_CONVERT, gino);
 473                                 INT_SET(irbp->ir_freecount, ARCH_CONVERT, gcnt);
 474                                 INT_SET(irbp->ir_free, ARCH_CONVERT, gfree);
 475                                 irbp++;
 476                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 477                         }
 478                         /*
 479                          * Set agino to after this chunk and bump the cursor.
 480                          */
 481                         agino = gino + XFS_INODES_PER_CHUNK;
 482                         error = xfs_inobt_increment(cur, 0, &tmp);
 483                 }
 484                 /*
 485                  * Drop the btree buffers and the agi buffer.
 486                  * We can't hold any of the locks these represent
 487                  * when calling iget.
 488                  */
 489                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 490                 xfs_buf_relse(agbp);
 491                 /*
 492                  * Now format all the good inodes into the user's buffer.
 493                  */
 494                 irbufend = irbp;
 495                 for (irbp = irbuf;
 496                      irbp < irbufend && ubleft >= statstruct_size; irbp++) {
 497                         /*
 498                          * Read-ahead the next chunk's worth of inodes.
 499                          */
 500                         if (&irbp[1] < irbufend) {
 501                                 /*
 502                                  * Loop over all clusters in the next chunk.
 503                                  * Do a readahead if there are any allocated
 504                                  * inodes in that cluster.
 505                                  */
 506                                 for (agbno = XFS_AGINO_TO_AGBNO(mp,
 507                                                         INT_GET(irbp[1].ir_startino, ARCH_CONVERT)),
 508                                      chunkidx = 0;
 509                                      chunkidx < XFS_INODES_PER_CHUNK;
 510                                      chunkidx += nicluster,
 511                                      agbno += nbcluster) {
 512                                         if (XFS_INOBT_MASKN(chunkidx,
 513                                                             nicluster) &
 514                                             ~(INT_GET(irbp[1].ir_free, ARCH_CONVERT)))
 515                                                 xfs_btree_reada_bufs(mp, agno,
 516                                                         agbno, nbcluster);
 517                                 }
 518                         }
 519                         /*
 520                          * Now process this chunk of inodes.
 521                          */
 522                         for (agino = INT_GET(irbp->ir_startino, ARCH_CONVERT), chunkidx = 0, clustidx = 0;
 523                              ubleft > 0 &&
 524                                 INT_GET(irbp->ir_freecount, ARCH_CONVERT) < XFS_INODES_PER_CHUNK;
 525                              chunkidx++, clustidx++, agino++) {
 526                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 527                                 /*
 528                                  * Recompute agbno if this is the
 529                                  * first inode of the cluster.
 530                                  *
 531                                  * Careful with clustidx.   There can be
 532                                  * multple clusters per chunk, a single
 533                                  * cluster per chunk or a cluster that has
 534                                  * inodes represented from several different
 535                                  * chunks (if blocksize is large).
 536                                  *
 537                                  * Because of this, the starting clustidx is
 538                                  * initialized to zero in this loop but must
 539                                  * later be reset after reading in the cluster
 540                                  * buffer.
 541                                  */
 542                                 if ((chunkidx & (nicluster - 1)) == 0) {
 543                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 544                                                         INT_GET(irbp->ir_startino, ARCH_CONVERT)) +
 545                                                 ((chunkidx & nimask) >>
 546                                                  mp->m_sb.sb_inopblog);
 547
 548                                         if (flags & BULKSTAT_FG_QUICK) {
 549                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 550                                                                        agino);
 551                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 552                                                                        agbno);
 553
 554                                                 /*
 555                                                  * Get the inode cluster buffer
 556                                                  */
 557                                                 ASSERT(xfs_inode_zone != NULL);
 558                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 559                                                                       KM_SLEEP);
 560                                                 ip->i_ino = ino;
 561                                                 ip->i_mount = mp;
 562                                                 if (bp)
 563                                                         xfs_buf_relse(bp);
 564                                                 error = xfs_itobp(mp, NULL, ip,
 565                                                                 &dip, &bp, bno,
 566                                                                 XFS_IMAP_BULKSTAT);
 567                                                 if (!error)
 568                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 569                                                 kmem_zone_free(xfs_inode_zone, ip);
 570                                                 if (XFS_TEST_ERROR(error != 0,
 571                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 572                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 573                                                         bp = NULL;
 574                                                         ubleft = 0;
 575                                                         rval = error;
 576                                                         break;
 577                                                 }
 578                                         }
 579                                 }
 580                                 /*
 581                                  * Skip if this inode is free.
 582                                  */
 583                                 if (XFS_INOBT_MASK(chunkidx) & INT_GET(irbp->ir_free, ARCH_CONVERT))
 584                                         continue;
 585                                 /*
 586                                  * Count used inodes as free so we can tell
 587                                  * when the chunk is used up.
 588                                  */
 589                                 INT_MOD(irbp->ir_freecount, ARCH_CONVERT, +1);
 590                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 591                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 592                                 if (flags & BULKSTAT_FG_QUICK) {
 593                                         dip = (xfs_dinode_t *)xfs_buf_offset(bp,
 594                                               (clustidx << mp->m_sb.sb_inodelog));
 595
 596                                         if (INT_GET(dip->di_core.di_magic, ARCH_CONVERT)
 597                                                     != XFS_DINODE_MAGIC
 598                                             || !XFS_DINODE_GOOD_VERSION(
 599                                                     INT_GET(dip->di_core.di_version, ARCH_CONVERT)))
 600                                                 continue;
 601                                 }
 602
 603                                 /*
 604                                  * Get the inode and fill in a single buffer.
 605                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 606                                  * BULKSTAT_FG_IGET uses igets.
 607                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 608                                  * This is also used to count inodes/blks, etc
 609                                  * in xfs_qm_quotacheck.
 610                                  */
 611                                 ubused = statstruct_size;
 612                                 error = formatter(mp, ino, ubufp,
 613                                                 ubleft, private_data,
 614                                                 bno, &ubused, dip, &fmterror);
 615                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 616                                         if (error == ENOMEM)
 617                                                 ubleft = 0;
 618                                         continue;
 619                                 }
 620                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 621                                         ubleft = 0;
 622                                         ASSERT(error);
 623                                         rval = error;
 624                                         break;
 625                                 }
 626                                 if (ubufp)
 627                                         ubufp += ubused;
 628                                 ubleft -= ubused;
 629                                 ubelem++;
 630                                 lastino = ino;
 631                         }
 632                 }
 633
 634                 if (bp)
 635                         xfs_buf_relse(bp);
 636
 637                 /*
 638                  * Set up for the next loop iteration.
 639                  */
 640                 if (ubleft > 0) {
 641                         if (end_of_ag) {
 642                                 agno++;
 643                                 agino = 0;
 644                         } else
 645                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 646                 } else
 647                         break;
 648         }
 649         /*
 650          * Done, we're either out of filesystem or space to put the data.
 651          */
 652         kmem_free(irbuf, NBPC);
 653         if (ubuffer)
 654                 unuseracc(ubuffer, ubcount * statstruct_size, (B_READ|B_PHYS));
 655         *ubcountp = ubelem;
 656         if (agno >= mp->m_sb.sb_agcount) {
 657                 /*
 658                  * If we ran out of filesystem, mark lastino as off
 659                  * the end of the filesystem, so the next call
 660                  * will return immediately.
 661                  */
 662                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 663                 *done = 1;
 664         } else
 665                 *lastinop = (xfs_ino_t)lastino;
 666
 667         return rval;
 668 }
 669
 670 /*
 671  * Return stat information in bulk (by-inode) for the filesystem.
 672  * Special case for non-sequential one inode bulkstat.
 673  */
 674 int                                     /* error status */
 675 xfs_bulkstat_single(
 676         xfs_mount_t             *mp,    /* mount point for filesystem */
 677         xfs_ino_t               *lastinop, /* inode to return */
 678         char                    __user *buffer, /* buffer with inode stats */
 679         int                     *done)  /* 1 if there are more stats to get */
 680 {
 681         int                     count;  /* count value for bulkstat call */
 682         int                     error;  /* return value */
 683         xfs_ino_t               ino;    /* filesystem inode number */
 684         int                     res;    /* result from bs1 */
 685
 686         /*
 687          * note that requesting valid inode numbers which are not allocated
 688          * to inodes will most likely cause xfs_itobp to generate warning
 689          * messages about bad magic numbers. This is ok. The fact that
 690          * the inode isn't actually an inode is handled by the
 691          * error check below. Done this way to make the usual case faster
 692          * at the expense of the error case.
 693          */
 694
 695         ino = (xfs_ino_t)*lastinop;
 696         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 697                                  NULL, 0, NULL, NULL, &res);
 698         if (error) {
 699                 /*
 700                  * Special case way failed, do it the "long" way
 701                  * to see if that works.
 702                  */
 703                 (*lastinop)--;
 704                 count = 1;
 705                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 706                                 NULL, sizeof(xfs_bstat_t), buffer,
 707                                 BULKSTAT_FG_IGET, done))
 708                         return error;
 709                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 710                         return error == EFSCORRUPTED ?
 711                                 XFS_ERROR(EINVAL) : error;
 712                 else
 713                         return 0;
 714         }
 715         *done = 0;
 716         return 0;
 717 }
 718
 719 /*
 720  * Return inode number table for the filesystem.
 721  */
 722 int                                     /* error status */
 723 xfs_inumbers(
 724         xfs_mount_t     *mp,            /* mount point for filesystem */
 725         xfs_ino_t       *lastino,       /* last inode returned */
 726         int             *count,         /* size of buffer/count returned */
 727         xfs_inogrp_t    __user *ubuffer)/* buffer with inode descriptions */
 728 {
 729         xfs_buf_t       *agbp;
 730         xfs_agino_t     agino;
 731         xfs_agnumber_t  agno;
 732         int             bcount;
 733         xfs_inogrp_t    *buffer;
 734         int             bufidx;
 735         xfs_btree_cur_t *cur;
 736         int             error;
 737         __int32_t       gcnt;
 738         xfs_inofree_t   gfree;
 739         xfs_agino_t     gino;
 740         int             i;
 741         xfs_ino_t       ino;
 742         int             left;
 743         int             tmp;
 744
 745         ino = (xfs_ino_t)*lastino;
 746         agno = XFS_INO_TO_AGNO(mp, ino);
 747         agino = XFS_INO_TO_AGINO(mp, ino);
 748         left = *count;
 749         *count = 0;
 750         bcount = MIN(left, (int)(NBPP / sizeof(*buffer)));
 751         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 752         error = bufidx = 0;
 753         cur = NULL;
 754         agbp = NULL;
 755         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 756                 if (agbp == NULL) {
 757                         down_read(&mp->m_peraglock);
 758                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 759                         up_read(&mp->m_peraglock);
 760                         if (error) {
 761                                 /*
 762                                  * If we can't read the AGI of this ag,
 763                                  * then just skip to the next one.
 764                                  */
 765                                 ASSERT(cur == NULL);
 766                                 agbp = NULL;
 767                                 agno++;
 768                                 agino = 0;
 769                                 continue;
 770                         }
 771                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 772                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 773                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 774                         if (error) {
 775                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 776                                 cur = NULL;
 777                                 xfs_buf_relse(agbp);
 778                                 agbp = NULL;
 779                                 /*
 780                                  * Move up the last inode in the current
 781                                  * chunk.  The lookup_ge will always get
 782                                  * us the first inode in the next chunk.
 783                                  */
 784                                 agino += XFS_INODES_PER_CHUNK - 1;
 785                                 continue;
 786                         }
 787                 }
 788                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 789                         &i)) ||
 790                     i == 0) {
 791                         xfs_buf_relse(agbp);
 792                         agbp = NULL;
 793                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 794                         cur = NULL;
 795                         agno++;
 796                         agino = 0;
 797                         continue;
 798                 }
 799                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 800                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 801                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 802                 buffer[bufidx].xi_allocmask = ~gfree;
 803                 bufidx++;
 804                 left--;
 805                 if (bufidx == bcount) {
 806                         if (copy_to_user(ubuffer, buffer,
 807                                         bufidx * sizeof(*buffer))) {
 808                                 error = XFS_ERROR(EFAULT);
 809                                 break;
 810                         }
 811                         ubuffer += bufidx;
 812                         *count += bufidx;
 813                         bufidx = 0;
 814                 }
 815                 if (left) {
 816                         error = xfs_inobt_increment(cur, 0, &tmp);
 817                         if (error) {
 818                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 819                                 cur = NULL;
 820                                 xfs_buf_relse(agbp);
 821                                 agbp = NULL;
 822                                 /*
 823                                  * The agino value has already been bumped.
 824                                  * Just try to skip up to it.
 825                                  */
 826                                 agino += XFS_INODES_PER_CHUNK;
 827                                 continue;
 828                         }
 829                 }
 830         }
 831         if (!error) {
 832                 if (bufidx) {
 833                         if (copy_to_user(ubuffer, buffer,
 834                                         bufidx * sizeof(*buffer)))
 835                                 error = XFS_ERROR(EFAULT);
 836                         else
 837                                 *count += bufidx;
 838                 }
 839                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 840         }
 841         kmem_free(buffer, bcount * sizeof(*buffer));
 842         if (cur)
 843                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 844                                            XFS_BTREE_NOERROR));
 845         if (agbp)
 846                 xfs_buf_relse(agbp);
 847         return error;
 848 }