fs/xfs/xfs_itable.c

   1 /*
   2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_types.h"
  21 #include "xfs_bit.h"
  22 #include "xfs_log.h"
  23 #include "xfs_inum.h"
  24 #include "xfs_trans.h"
  25 #include "xfs_sb.h"
  26 #include "xfs_ag.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_dmapi.h"
  29 #include "xfs_mount.h"
  30 #include "xfs_bmap_btree.h"
  31 #include "xfs_alloc_btree.h"
  32 #include "xfs_ialloc_btree.h"
  33 #include "xfs_dir2_sf.h"
  34 #include "xfs_attr_sf.h"
  35 #include "xfs_dinode.h"
  36 #include "xfs_inode.h"
  37 #include "xfs_ialloc.h"
  38 #include "xfs_itable.h"
  39 #include "xfs_error.h"
  40 #include "xfs_btree.h"
  41
  42 int
  43 xfs_internal_inum(
  44         xfs_mount_t     *mp,
  45         xfs_ino_t       ino)
  46 {
  47         return (ino == mp->m_sb.sb_rbmino || ino == mp->m_sb.sb_rsumino ||
  48                 (xfs_sb_version_hasquota(&mp->m_sb) &&
  49                  (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino)));
  50 }
  51
  52 STATIC int
  53 xfs_bulkstat_one_iget(
  54         xfs_mount_t     *mp,            /* mount point for filesystem */
  55         xfs_ino_t       ino,            /* inode number to get data for */
  56         xfs_daddr_t     bno,            /* starting bno of inode cluster */
  57         xfs_bstat_t     *buf,           /* return buffer */
  58         int             *stat)          /* BULKSTAT_RV_... */
  59 {
  60         xfs_icdinode_t  *dic;   /* dinode core info pointer */
  61         xfs_inode_t     *ip;            /* incore inode pointer */
  62         bhv_vnode_t     *vp;
  63         int             error;
  64
  65         error = xfs_iget(mp, NULL, ino,
  66                          XFS_IGET_BULKSTAT, XFS_ILOCK_SHARED, &ip, bno);
  67         if (error) {
  68                 *stat = BULKSTAT_RV_NOTHING;
  69                 return error;
  70         }
  71
  72         ASSERT(ip != NULL);
  73         ASSERT(ip->i_blkno != (xfs_daddr_t)0);
  74         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 void
 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 (dic->di_version == XFS_DINODE_VERSION_1) {
 155                 buf->bs_nlink = be16_to_cpu(dic->di_onlink);
 156                 buf->bs_projid = 0;
 157         } else {
 158                 buf->bs_nlink = be32_to_cpu(dic->di_nlink);
 159                 buf->bs_projid = be16_to_cpu(dic->di_projid);
 160         }
 161
 162         buf->bs_ino = ino;
 163         buf->bs_mode = be16_to_cpu(dic->di_mode);
 164         buf->bs_uid = be32_to_cpu(dic->di_uid);
 165         buf->bs_gid = be32_to_cpu(dic->di_gid);
 166         buf->bs_size = be64_to_cpu(dic->di_size);
 167         buf->bs_atime.tv_sec = be32_to_cpu(dic->di_atime.t_sec);
 168         buf->bs_atime.tv_nsec = be32_to_cpu(dic->di_atime.t_nsec);
 169         buf->bs_mtime.tv_sec = be32_to_cpu(dic->di_mtime.t_sec);
 170         buf->bs_mtime.tv_nsec = be32_to_cpu(dic->di_mtime.t_nsec);
 171         buf->bs_ctime.tv_sec = be32_to_cpu(dic->di_ctime.t_sec);
 172         buf->bs_ctime.tv_nsec = be32_to_cpu(dic->di_ctime.t_nsec);
 173         buf->bs_xflags = xfs_dic2xflags(dip);
 174         buf->bs_extsize = be32_to_cpu(dic->di_extsize) << mp->m_sb.sb_blocklog;
 175         buf->bs_extents = be32_to_cpu(dic->di_nextents);
 176         buf->bs_gen = be32_to_cpu(dic->di_gen);
 177         memset(buf->bs_pad, 0, sizeof(buf->bs_pad));
 178         buf->bs_dmevmask = be32_to_cpu(dic->di_dmevmask);
 179         buf->bs_dmstate = be16_to_cpu(dic->di_dmstate);
 180         buf->bs_aextents = be16_to_cpu(dic->di_anextents);
 181
 182         switch (dic->di_format) {
 183         case XFS_DINODE_FMT_DEV:
 184                 buf->bs_rdev = be32_to_cpu(dip->di_u.di_dev);
 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 = be64_to_cpu(dic->di_nblocks);
 199                 break;
 200         }
 201 }
 202
 203 STATIC int
 204 xfs_bulkstat_one_fmt(
 205         void                    __user *ubuffer,
 206         const xfs_bstat_t       *buffer)
 207 {
 208         if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
 209                 return -EFAULT;
 210         return sizeof(*buffer);
 211 }
 212
 213 /*
 214  * Return stat information for one inode.
 215  * Return 0 if ok, else errno.
 216  */
 217 int                             /* error status */
 218 xfs_bulkstat_one(
 219         xfs_mount_t     *mp,            /* mount point for filesystem */
 220         xfs_ino_t       ino,            /* inode number to get data for */
 221         void            __user *buffer, /* buffer to place output in */
 222         int             ubsize,         /* size of buffer */
 223         void            *private_data,  /* my private data */
 224         xfs_daddr_t     bno,            /* starting bno of inode cluster */
 225         int             *ubused,        /* bytes used by me */
 226         void            *dibuff,        /* on-disk inode buffer */
 227         int             *stat)          /* BULKSTAT_RV_... */
 228 {
 229         xfs_bstat_t     *buf;           /* return buffer */
 230         int             error = 0;      /* error value */
 231         xfs_dinode_t    *dip;           /* dinode inode pointer */
 232         bulkstat_one_fmt_pf formatter = private_data ? : xfs_bulkstat_one_fmt;
 233
 234         dip = (xfs_dinode_t *)dibuff;
 235         *stat = BULKSTAT_RV_NOTHING;
 236
 237         if (!buffer || xfs_internal_inum(mp, ino))
 238                 return XFS_ERROR(EINVAL);
 239         if (ubsize < sizeof(*buf))
 240                 return XFS_ERROR(ENOMEM);
 241
 242         buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
 243
 244         if (dip == NULL) {
 245                 /* We're not being passed a pointer to a dinode.  This happens
 246                  * if BULKSTAT_FG_IGET is selected.  Do the iget.
 247                  */
 248                 error = xfs_bulkstat_one_iget(mp, ino, bno, buf, stat);
 249                 if (error)
 250                         goto out_free;
 251         } else {
 252                 xfs_bulkstat_one_dinode(mp, ino, dip, buf);
 253         }
 254
 255         error = formatter(buffer, buf);
 256         if (error < 0)  {
 257                 error = EFAULT;
 258                 goto out_free;
 259         }
 260
 261         *stat = BULKSTAT_RV_DIDONE;
 262         if (ubused)
 263                 *ubused = error;
 264
 265  out_free:
 266         kmem_free(buf, sizeof(*buf));
 267         return error;
 268 }
 269
 270 /*
 271  * Test to see whether we can use the ondisk inode directly, based
 272  * on the given bulkstat flags, filling in dipp accordingly.
 273  * Returns zero if the inode is dodgey.
 274  */
 275 STATIC int
 276 xfs_bulkstat_use_dinode(
 277         xfs_mount_t     *mp,
 278         int             flags,
 279         xfs_buf_t       *bp,
 280         int             clustidx,
 281         xfs_dinode_t    **dipp)
 282 {
 283         xfs_dinode_t    *dip;
 284         unsigned int    aformat;
 285
 286         *dipp = NULL;
 287         if (!bp || (flags & BULKSTAT_FG_IGET))
 288                 return 1;
 289         dip = (xfs_dinode_t *)
 290                         xfs_buf_offset(bp, clustidx << mp->m_sb.sb_inodelog);
 291         /*
 292          * Check the buffer containing the on-disk inode for di_mode == 0.
 293          * This is to prevent xfs_bulkstat from picking up just reclaimed
 294          * inodes that have their in-core state initialized but not flushed
 295          * to disk yet. This is a temporary hack that would require a proper
 296          * fix in the future.
 297          */
 298         if (be16_to_cpu(dip->di_core.di_magic) != XFS_DINODE_MAGIC ||
 299             !XFS_DINODE_GOOD_VERSION(dip->di_core.di_version) ||
 300             !dip->di_core.di_mode)
 301                 return 0;
 302         if (flags & BULKSTAT_FG_QUICK) {
 303                 *dipp = dip;
 304                 return 1;
 305         }
 306         /* BULKSTAT_FG_INLINE: if attr fork is local, or not there, use it */
 307         aformat = dip->di_core.di_aformat;
 308         if ((XFS_DFORK_Q(dip) == 0) ||
 309             (aformat == XFS_DINODE_FMT_LOCAL) ||
 310             (aformat == XFS_DINODE_FMT_EXTENTS && !dip->di_core.di_anextents)) {
 311                 *dipp = dip;
 312                 return 1;
 313         }
 314         return 1;
 315 }
 316
 317 #define XFS_BULKSTAT_UBLEFT(ubleft)     ((ubleft) >= statstruct_size)
 318
 319 /*
 320  * Return stat information in bulk (by-inode) for the filesystem.
 321  */
 322 int                                     /* error status */
 323 xfs_bulkstat(
 324         xfs_mount_t             *mp,    /* mount point for filesystem */
 325         xfs_ino_t               *lastinop, /* last inode returned */
 326         int                     *ubcountp, /* size of buffer/count returned */
 327         bulkstat_one_pf         formatter, /* func that'd fill a single buf */
 328         void                    *private_data,/* private data for formatter */
 329         size_t                  statstruct_size, /* sizeof struct filling */
 330         char                    __user *ubuffer, /* buffer with inode stats */
 331         int                     flags,  /* defined in xfs_itable.h */
 332         int                     *done)  /* 1 if there are more stats to get */
 333 {
 334         xfs_agblock_t           agbno=0;/* allocation group block number */
 335         xfs_buf_t               *agbp;  /* agi header buffer */
 336         xfs_agi_t               *agi;   /* agi header data */
 337         xfs_agino_t             agino;  /* inode # in allocation group */
 338         xfs_agnumber_t          agno;   /* allocation group number */
 339         xfs_daddr_t             bno;    /* inode cluster start daddr */
 340         int                     chunkidx; /* current index into inode chunk */
 341         int                     clustidx; /* current index into inode cluster */
 342         xfs_btree_cur_t         *cur;   /* btree cursor for ialloc btree */
 343         int                     end_of_ag; /* set if we've seen the ag end */
 344         int                     error;  /* error code */
 345         int                     fmterror;/* bulkstat formatter result */
 346         __int32_t               gcnt;   /* current btree rec's count */
 347         xfs_inofree_t           gfree;  /* current btree rec's free mask */
 348         xfs_agino_t             gino;   /* current btree rec's start inode */
 349         int                     i;      /* loop index */
 350         int                     icount; /* count of inodes good in irbuf */
 351         size_t                  irbsize; /* size of irec buffer in bytes */
 352         xfs_ino_t               ino;    /* inode number (filesystem) */
 353         xfs_inobt_rec_incore_t  *irbp;  /* current irec buffer pointer */
 354         xfs_inobt_rec_incore_t  *irbuf; /* start of irec buffer */
 355         xfs_inobt_rec_incore_t  *irbufend; /* end of good irec buffer entries */
 356         xfs_ino_t               lastino; /* last inode number returned */
 357         int                     nbcluster; /* # of blocks in a cluster */
 358         int                     nicluster; /* # of inodes in a cluster */
 359         int                     nimask; /* mask for inode clusters */
 360         int                     nirbuf; /* size of irbuf */
 361         int                     rval;   /* return value error code */
 362         int                     tmp;    /* result value from btree calls */
 363         int                     ubcount; /* size of user's buffer */
 364         int                     ubleft; /* bytes left in user's buffer */
 365         char                    __user *ubufp;  /* pointer into user's buffer */
 366         int                     ubelem; /* spaces used in user's buffer */
 367         int                     ubused; /* bytes used by formatter */
 368         xfs_buf_t               *bp;    /* ptr to on-disk inode cluster buf */
 369         xfs_dinode_t            *dip;   /* ptr into bp for specific inode */
 370         xfs_inode_t             *ip;    /* ptr to in-core inode struct */
 371
 372         /*
 373          * Get the last inode value, see if there's nothing to do.
 374          */
 375         ino = (xfs_ino_t)*lastinop;
 376         lastino = ino;
 377         dip = NULL;
 378         agno = XFS_INO_TO_AGNO(mp, ino);
 379         agino = XFS_INO_TO_AGINO(mp, ino);
 380         if (agno >= mp->m_sb.sb_agcount ||
 381             ino != XFS_AGINO_TO_INO(mp, agno, agino)) {
 382                 *done = 1;
 383                 *ubcountp = 0;
 384                 return 0;
 385         }
 386         if (!ubcountp || *ubcountp <= 0) {
 387                 return EINVAL;
 388         }
 389         ubcount = *ubcountp; /* statstruct's */
 390         ubleft = ubcount * statstruct_size; /* bytes */
 391         *ubcountp = ubelem = 0;
 392         *done = 0;
 393         fmterror = 0;
 394         ubufp = ubuffer;
 395         nicluster = mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp) ?
 396                 mp->m_sb.sb_inopblock :
 397                 (XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog);
 398         nimask = ~(nicluster - 1);
 399         nbcluster = nicluster >> mp->m_sb.sb_inopblog;
 400         irbuf = kmem_zalloc_greedy(&irbsize, PAGE_SIZE, PAGE_SIZE * 4,
 401                                    KM_SLEEP | KM_MAYFAIL | KM_LARGE);
 402         nirbuf = irbsize / sizeof(*irbuf);
 403
 404         /*
 405          * Loop over the allocation groups, starting from the last
 406          * inode returned; 0 means start of the allocation group.
 407          */
 408         rval = 0;
 409         while (XFS_BULKSTAT_UBLEFT(ubleft) && agno < mp->m_sb.sb_agcount) {
 410                 cond_resched();
 411                 bp = NULL;
 412                 down_read(&mp->m_peraglock);
 413                 error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 414                 up_read(&mp->m_peraglock);
 415                 if (error) {
 416                         /*
 417                          * Skip this allocation group and go to the next one.
 418                          */
 419                         agno++;
 420                         agino = 0;
 421                         continue;
 422                 }
 423                 agi = XFS_BUF_TO_AGI(agbp);
 424                 /*
 425                  * Allocate and initialize a btree cursor for ialloc btree.
 426                  */
 427                 cur = xfs_btree_init_cursor(mp, NULL, agbp, agno, XFS_BTNUM_INO,
 428                                                 (xfs_inode_t *)0, 0);
 429                 irbp = irbuf;
 430                 irbufend = irbuf + nirbuf;
 431                 end_of_ag = 0;
 432                 /*
 433                  * If we're returning in the middle of an allocation group,
 434                  * we need to get the remainder of the chunk we're in.
 435                  */
 436                 if (agino > 0) {
 437                         /*
 438                          * Lookup the inode chunk that this inode lives in.
 439                          */
 440                         error = xfs_inobt_lookup_le(cur, agino, 0, 0, &tmp);
 441                         if (!error &&   /* no I/O error */
 442                             tmp &&      /* lookup succeeded */
 443                                         /* got the record, should always work */
 444                             !(error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 445                                     &gfree, &i)) &&
 446                             i == 1 &&
 447                                         /* this is the right chunk */
 448                             agino < gino + XFS_INODES_PER_CHUNK &&
 449                                         /* lastino was not last in chunk */
 450                             (chunkidx = agino - gino + 1) <
 451                                     XFS_INODES_PER_CHUNK &&
 452                                         /* there are some left allocated */
 453                             XFS_INOBT_MASKN(chunkidx,
 454                                     XFS_INODES_PER_CHUNK - chunkidx) & ~gfree) {
 455                                 /*
 456                                  * Grab the chunk record.  Mark all the
 457                                  * uninteresting inodes (because they're
 458                                  * before our start point) free.
 459                                  */
 460                                 for (i = 0; i < chunkidx; i++) {
 461                                         if (XFS_INOBT_MASK(i) & ~gfree)
 462                                                 gcnt++;
 463                                 }
 464                                 gfree |= XFS_INOBT_MASKN(0, chunkidx);
 465                                 irbp->ir_startino = gino;
 466                                 irbp->ir_freecount = gcnt;
 467                                 irbp->ir_free = gfree;
 468                                 irbp++;
 469                                 agino = gino + XFS_INODES_PER_CHUNK;
 470                                 icount = XFS_INODES_PER_CHUNK - gcnt;
 471                         } else {
 472                                 /*
 473                                  * If any of those tests failed, bump the
 474                                  * inode number (just in case).
 475                                  */
 476                                 agino++;
 477                                 icount = 0;
 478                         }
 479                         /*
 480                          * In any case, increment to the next record.
 481                          */
 482                         if (!error)
 483                                 error = xfs_inobt_increment(cur, 0, &tmp);
 484                 } else {
 485                         /*
 486                          * Start of ag.  Lookup the first inode chunk.
 487                          */
 488                         error = xfs_inobt_lookup_ge(cur, 0, 0, 0, &tmp);
 489                         icount = 0;
 490                 }
 491                 /*
 492                  * Loop through inode btree records in this ag,
 493                  * until we run out of inodes or space in the buffer.
 494                  */
 495                 while (irbp < irbufend && icount < ubcount) {
 496                         /*
 497                          * Loop as long as we're unable to read the
 498                          * inode btree.
 499                          */
 500                         while (error) {
 501                                 agino += XFS_INODES_PER_CHUNK;
 502                                 if (XFS_AGINO_TO_AGBNO(mp, agino) >=
 503                                                 be32_to_cpu(agi->agi_length))
 504                                         break;
 505                                 error = xfs_inobt_lookup_ge(cur, agino, 0, 0,
 506                                                             &tmp);
 507                                 cond_resched();
 508                         }
 509                         /*
 510                          * If ran off the end of the ag either with an error,
 511                          * or the normal way, set end and stop collecting.
 512                          */
 513                         if (error ||
 514                             (error = xfs_inobt_get_rec(cur, &gino, &gcnt,
 515                                     &gfree, &i)) ||
 516                             i == 0) {
 517                                 end_of_ag = 1;
 518                                 break;
 519                         }
 520                         /*
 521                          * If this chunk has any allocated inodes, save it.
 522                          * Also start read-ahead now for this chunk.
 523                          */
 524                         if (gcnt < XFS_INODES_PER_CHUNK) {
 525                                 /*
 526                                  * Loop over all clusters in the next chunk.
 527                                  * Do a readahead if there are any allocated
 528                                  * inodes in that cluster.
 529                                  */
 530                                 for (agbno = XFS_AGINO_TO_AGBNO(mp, gino),
 531                                      chunkidx = 0;
 532                                      chunkidx < XFS_INODES_PER_CHUNK;
 533                                      chunkidx += nicluster,
 534                                      agbno += nbcluster) {
 535                                         if (XFS_INOBT_MASKN(chunkidx,
 536                                                             nicluster) & ~gfree)
 537                                                 xfs_btree_reada_bufs(mp, agno,
 538                                                         agbno, nbcluster);
 539                                 }
 540                                 irbp->ir_startino = gino;
 541                                 irbp->ir_freecount = gcnt;
 542                                 irbp->ir_free = gfree;
 543                                 irbp++;
 544                                 icount += XFS_INODES_PER_CHUNK - gcnt;
 545                         }
 546                         /*
 547                          * Set agino to after this chunk and bump the cursor.
 548                          */
 549                         agino = gino + XFS_INODES_PER_CHUNK;
 550                         error = xfs_inobt_increment(cur, 0, &tmp);
 551                         cond_resched();
 552                 }
 553                 /*
 554                  * Drop the btree buffers and the agi buffer.
 555                  * We can't hold any of the locks these represent
 556                  * when calling iget.
 557                  */
 558                 xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 559                 xfs_buf_relse(agbp);
 560                 /*
 561                  * Now format all the good inodes into the user's buffer.
 562                  */
 563                 irbufend = irbp;
 564                 for (irbp = irbuf;
 565                      irbp < irbufend && XFS_BULKSTAT_UBLEFT(ubleft); irbp++) {
 566                         /*
 567                          * Now process this chunk of inodes.
 568                          */
 569                         for (agino = irbp->ir_startino, chunkidx = clustidx = 0;
 570                              XFS_BULKSTAT_UBLEFT(ubleft) &&
 571                                 irbp->ir_freecount < XFS_INODES_PER_CHUNK;
 572                              chunkidx++, clustidx++, agino++) {
 573                                 ASSERT(chunkidx < XFS_INODES_PER_CHUNK);
 574                                 /*
 575                                  * Recompute agbno if this is the
 576                                  * first inode of the cluster.
 577                                  *
 578                                  * Careful with clustidx.   There can be
 579                                  * multple clusters per chunk, a single
 580                                  * cluster per chunk or a cluster that has
 581                                  * inodes represented from several different
 582                                  * chunks (if blocksize is large).
 583                                  *
 584                                  * Because of this, the starting clustidx is
 585                                  * initialized to zero in this loop but must
 586                                  * later be reset after reading in the cluster
 587                                  * buffer.
 588                                  */
 589                                 if ((chunkidx & (nicluster - 1)) == 0) {
 590                                         agbno = XFS_AGINO_TO_AGBNO(mp,
 591                                                         irbp->ir_startino) +
 592                                                 ((chunkidx & nimask) >>
 593                                                  mp->m_sb.sb_inopblog);
 594
 595                                         if (flags & (BULKSTAT_FG_QUICK |
 596                                                      BULKSTAT_FG_INLINE)) {
 597                                                 ino = XFS_AGINO_TO_INO(mp, agno,
 598                                                                        agino);
 599                                                 bno = XFS_AGB_TO_DADDR(mp, agno,
 600                                                                        agbno);
 601
 602                                                 /*
 603                                                  * Get the inode cluster buffer
 604                                                  */
 605                                                 ASSERT(xfs_inode_zone != NULL);
 606                                                 ip = kmem_zone_zalloc(xfs_inode_zone,
 607                                                                       KM_SLEEP);
 608                                                 ip->i_ino = ino;
 609                                                 ip->i_mount = mp;
 610                                                 spin_lock_init(&ip->i_flags_lock);
 611                                                 if (bp)
 612                                                         xfs_buf_relse(bp);
 613                                                 error = xfs_itobp(mp, NULL, ip,
 614                                                                 &dip, &bp, bno,
 615                                                                 XFS_IMAP_BULKSTAT,
 616                                                                 XFS_BUF_LOCK);
 617                                                 if (!error)
 618                                                         clustidx = ip->i_boffset / mp->m_sb.sb_inodesize;
 619                                                 kmem_zone_free(xfs_inode_zone, ip);
 620                                                 if (XFS_TEST_ERROR(error != 0,
 621                                                                    mp, XFS_ERRTAG_BULKSTAT_READ_CHUNK,
 622                                                                    XFS_RANDOM_BULKSTAT_READ_CHUNK)) {
 623                                                         bp = NULL;
 624                                                         ubleft = 0;
 625                                                         rval = error;
 626                                                         break;
 627                                                 }
 628                                         }
 629                                 }
 630                                 ino = XFS_AGINO_TO_INO(mp, agno, agino);
 631                                 bno = XFS_AGB_TO_DADDR(mp, agno, agbno);
 632                                 /*
 633                                  * Skip if this inode is free.
 634                                  */
 635                                 if (XFS_INOBT_MASK(chunkidx) & irbp->ir_free) {
 636                                         lastino = ino;
 637                                         continue;
 638                                 }
 639                                 /*
 640                                  * Count used inodes as free so we can tell
 641                                  * when the chunk is used up.
 642                                  */
 643                                 irbp->ir_freecount++;
 644                                 if (!xfs_bulkstat_use_dinode(mp, flags, bp,
 645                                                              clustidx, &dip)) {
 646                                         lastino = ino;
 647                                         continue;
 648                                 }
 649                                 /*
 650                                  * If we need to do an iget, cannot hold bp.
 651                                  * Drop it, until starting the next cluster.
 652                                  */
 653                                 if ((flags & BULKSTAT_FG_INLINE) && !dip) {
 654                                         if (bp)
 655                                                 xfs_buf_relse(bp);
 656                                         bp = NULL;
 657                                 }
 658
 659                                 /*
 660                                  * Get the inode and fill in a single buffer.
 661                                  * BULKSTAT_FG_QUICK uses dip to fill it in.
 662                                  * BULKSTAT_FG_IGET uses igets.
 663                                  * BULKSTAT_FG_INLINE uses dip if we have an
 664                                  * inline attr fork, else igets.
 665                                  * See: xfs_bulkstat_one & xfs_dm_bulkstat_one.
 666                                  * This is also used to count inodes/blks, etc
 667                                  * in xfs_qm_quotacheck.
 668                                  */
 669                                 ubused = statstruct_size;
 670                                 error = formatter(mp, ino, ubufp,
 671                                                 ubleft, private_data,
 672                                                 bno, &ubused, dip, &fmterror);
 673                                 if (fmterror == BULKSTAT_RV_NOTHING) {
 674                                         if (error && error != ENOENT &&
 675                                                 error != EINVAL) {
 676                                                 ubleft = 0;
 677                                                 rval = error;
 678                                                 break;
 679                                         }
 680                                         lastino = ino;
 681                                         continue;
 682                                 }
 683                                 if (fmterror == BULKSTAT_RV_GIVEUP) {
 684                                         ubleft = 0;
 685                                         ASSERT(error);
 686                                         rval = error;
 687                                         break;
 688                                 }
 689                                 if (ubufp)
 690                                         ubufp += ubused;
 691                                 ubleft -= ubused;
 692                                 ubelem++;
 693                                 lastino = ino;
 694                         }
 695
 696                         cond_resched();
 697                 }
 698
 699                 if (bp)
 700                         xfs_buf_relse(bp);
 701
 702                 /*
 703                  * Set up for the next loop iteration.
 704                  */
 705                 if (XFS_BULKSTAT_UBLEFT(ubleft)) {
 706                         if (end_of_ag) {
 707                                 agno++;
 708                                 agino = 0;
 709                         } else
 710                                 agino = XFS_INO_TO_AGINO(mp, lastino);
 711                 } else
 712                         break;
 713         }
 714         /*
 715          * Done, we're either out of filesystem or space to put the data.
 716          */
 717         kmem_free(irbuf, irbsize);
 718         *ubcountp = ubelem;
 719         /*
 720          * Found some inodes, return them now and return the error next time.
 721          */
 722         if (ubelem)
 723                 rval = 0;
 724         if (agno >= mp->m_sb.sb_agcount) {
 725                 /*
 726                  * If we ran out of filesystem, mark lastino as off
 727                  * the end of the filesystem, so the next call
 728                  * will return immediately.
 729                  */
 730                 *lastinop = (xfs_ino_t)XFS_AGINO_TO_INO(mp, agno, 0);
 731                 *done = 1;
 732         } else
 733                 *lastinop = (xfs_ino_t)lastino;
 734
 735         return rval;
 736 }
 737
 738 /*
 739  * Return stat information in bulk (by-inode) for the filesystem.
 740  * Special case for non-sequential one inode bulkstat.
 741  */
 742 int                                     /* error status */
 743 xfs_bulkstat_single(
 744         xfs_mount_t             *mp,    /* mount point for filesystem */
 745         xfs_ino_t               *lastinop, /* inode to return */
 746         char                    __user *buffer, /* buffer with inode stats */
 747         int                     *done)  /* 1 if there are more stats to get */
 748 {
 749         int                     count;  /* count value for bulkstat call */
 750         int                     error;  /* return value */
 751         xfs_ino_t               ino;    /* filesystem inode number */
 752         int                     res;    /* result from bs1 */
 753
 754         /*
 755          * note that requesting valid inode numbers which are not allocated
 756          * to inodes will most likely cause xfs_itobp to generate warning
 757          * messages about bad magic numbers. This is ok. The fact that
 758          * the inode isn't actually an inode is handled by the
 759          * error check below. Done this way to make the usual case faster
 760          * at the expense of the error case.
 761          */
 762
 763         ino = (xfs_ino_t)*lastinop;
 764         error = xfs_bulkstat_one(mp, ino, buffer, sizeof(xfs_bstat_t),
 765                                  NULL, 0, NULL, NULL, &res);
 766         if (error) {
 767                 /*
 768                  * Special case way failed, do it the "long" way
 769                  * to see if that works.
 770                  */
 771                 (*lastinop)--;
 772                 count = 1;
 773                 if (xfs_bulkstat(mp, lastinop, &count, xfs_bulkstat_one,
 774                                 NULL, sizeof(xfs_bstat_t), buffer,
 775                                 BULKSTAT_FG_IGET, done))
 776                         return error;
 777                 if (count == 0 || (xfs_ino_t)*lastinop != ino)
 778                         return error == EFSCORRUPTED ?
 779                                 XFS_ERROR(EINVAL) : error;
 780                 else
 781                         return 0;
 782         }
 783         *done = 0;
 784         return 0;
 785 }
 786
 787 int
 788 xfs_inumbers_fmt(
 789         void                    __user *ubuffer, /* buffer to write to */
 790         const xfs_inogrp_t      *buffer,        /* buffer to read from */
 791         long                    count,          /* # of elements to read */
 792         long                    *written)       /* # of bytes written */
 793 {
 794         if (copy_to_user(ubuffer, buffer, count * sizeof(*buffer)))
 795                 return -EFAULT;
 796         *written = count * sizeof(*buffer);
 797         return 0;
 798 }
 799
 800 /*
 801  * Return inode number table for the filesystem.
 802  */
 803 int                                     /* error status */
 804 xfs_inumbers(
 805         xfs_mount_t     *mp,            /* mount point for filesystem */
 806         xfs_ino_t       *lastino,       /* last inode returned */
 807         int             *count,         /* size of buffer/count returned */
 808         void            __user *ubuffer,/* buffer with inode descriptions */
 809         inumbers_fmt_pf formatter)
 810 {
 811         xfs_buf_t       *agbp;
 812         xfs_agino_t     agino;
 813         xfs_agnumber_t  agno;
 814         int             bcount;
 815         xfs_inogrp_t    *buffer;
 816         int             bufidx;
 817         xfs_btree_cur_t *cur;
 818         int             error;
 819         __int32_t       gcnt;
 820         xfs_inofree_t   gfree;
 821         xfs_agino_t     gino;
 822         int             i;
 823         xfs_ino_t       ino;
 824         int             left;
 825         int             tmp;
 826
 827         ino = (xfs_ino_t)*lastino;
 828         agno = XFS_INO_TO_AGNO(mp, ino);
 829         agino = XFS_INO_TO_AGINO(mp, ino);
 830         left = *count;
 831         *count = 0;
 832         bcount = MIN(left, (int)(PAGE_SIZE / sizeof(*buffer)));
 833         buffer = kmem_alloc(bcount * sizeof(*buffer), KM_SLEEP);
 834         error = bufidx = 0;
 835         cur = NULL;
 836         agbp = NULL;
 837         while (left > 0 && agno < mp->m_sb.sb_agcount) {
 838                 if (agbp == NULL) {
 839                         down_read(&mp->m_peraglock);
 840                         error = xfs_ialloc_read_agi(mp, NULL, agno, &agbp);
 841                         up_read(&mp->m_peraglock);
 842                         if (error) {
 843                                 /*
 844                                  * If we can't read the AGI of this ag,
 845                                  * then just skip to the next one.
 846                                  */
 847                                 ASSERT(cur == NULL);
 848                                 agbp = NULL;
 849                                 agno++;
 850                                 agino = 0;
 851                                 continue;
 852                         }
 853                         cur = xfs_btree_init_cursor(mp, NULL, agbp, agno,
 854                                 XFS_BTNUM_INO, (xfs_inode_t *)0, 0);
 855                         error = xfs_inobt_lookup_ge(cur, agino, 0, 0, &tmp);
 856                         if (error) {
 857                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 858                                 cur = NULL;
 859                                 xfs_buf_relse(agbp);
 860                                 agbp = NULL;
 861                                 /*
 862                                  * Move up the last inode in the current
 863                                  * chunk.  The lookup_ge will always get
 864                                  * us the first inode in the next chunk.
 865                                  */
 866                                 agino += XFS_INODES_PER_CHUNK - 1;
 867                                 continue;
 868                         }
 869                 }
 870                 if ((error = xfs_inobt_get_rec(cur, &gino, &gcnt, &gfree,
 871                         &i)) ||
 872                     i == 0) {
 873                         xfs_buf_relse(agbp);
 874                         agbp = NULL;
 875                         xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
 876                         cur = NULL;
 877                         agno++;
 878                         agino = 0;
 879                         continue;
 880                 }
 881                 agino = gino + XFS_INODES_PER_CHUNK - 1;
 882                 buffer[bufidx].xi_startino = XFS_AGINO_TO_INO(mp, agno, gino);
 883                 buffer[bufidx].xi_alloccount = XFS_INODES_PER_CHUNK - gcnt;
 884                 buffer[bufidx].xi_allocmask = ~gfree;
 885                 bufidx++;
 886                 left--;
 887                 if (bufidx == bcount) {
 888                         long written;
 889                         if (formatter(ubuffer, buffer, bufidx, &written)) {
 890                                 error = XFS_ERROR(EFAULT);
 891                                 break;
 892                         }
 893                         ubuffer += written;
 894                         *count += bufidx;
 895                         bufidx = 0;
 896                 }
 897                 if (left) {
 898                         error = xfs_inobt_increment(cur, 0, &tmp);
 899                         if (error) {
 900                                 xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
 901                                 cur = NULL;
 902                                 xfs_buf_relse(agbp);
 903                                 agbp = NULL;
 904                                 /*
 905                                  * The agino value has already been bumped.
 906                                  * Just try to skip up to it.
 907                                  */
 908                                 agino += XFS_INODES_PER_CHUNK;
 909                                 continue;
 910                         }
 911                 }
 912         }
 913         if (!error) {
 914                 if (bufidx) {
 915                         long written;
 916                         if (formatter(ubuffer, buffer, bufidx, &written))
 917                                 error = XFS_ERROR(EFAULT);
 918                         else
 919                                 *count += bufidx;
 920                 }
 921                 *lastino = XFS_AGINO_TO_INO(mp, agno, agino);
 922         }
 923         kmem_free(buffer, bcount * sizeof(*buffer));
 924         if (cur)
 925                 xfs_btree_del_cursor(cur, (error ? XFS_BTREE_ERROR :
 926                                            XFS_BTREE_NOERROR));
 927         if (agbp)
 928                 xfs_buf_relse(agbp);
 929         return error;
 930 }