fs/xfs/scrub/inode.c

   1 /*
   2  * Copyright (C) 2017 Oracle.  All Rights Reserved.
   3  *
   4  * Author: Darrick J. Wong <darrick.wong@oracle.com>
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it would be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program; if not, write the Free Software Foundation,
  18  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301, USA.
  19  */
  20 #include "xfs.h"
  21 #include "xfs_fs.h"
  22 #include "xfs_shared.h"
  23 #include "xfs_format.h"
  24 #include "xfs_trans_resv.h"
  25 #include "xfs_mount.h"
  26 #include "xfs_defer.h"
  27 #include "xfs_btree.h"
  28 #include "xfs_bit.h"
  29 #include "xfs_log_format.h"
  30 #include "xfs_trans.h"
  31 #include "xfs_sb.h"
  32 #include "xfs_inode.h"
  33 #include "xfs_icache.h"
  34 #include "xfs_inode_buf.h"
  35 #include "xfs_inode_fork.h"
  36 #include "xfs_ialloc.h"
  37 #include "xfs_da_format.h"
  38 #include "xfs_reflink.h"
  39 #include "xfs_rmap.h"
  40 #include "xfs_bmap.h"
  41 #include "xfs_bmap_util.h"
  42 #include "scrub/xfs_scrub.h"
  43 #include "scrub/scrub.h"
  44 #include "scrub/common.h"
  45 #include "scrub/btree.h"
  46 #include "scrub/trace.h"
  47
  48 /*
  49  * Grab total control of the inode metadata.  It doesn't matter here if
  50  * the file data is still changing; exclusive access to the metadata is
  51  * the goal.
  52  */
  53 int
  54 xfs_scrub_setup_inode(
  55         struct xfs_scrub_context        *sc,
  56         struct xfs_inode                *ip)
  57 {
  58         struct xfs_mount                *mp = sc->mp;
  59         int                             error;
  60
  61         /*
  62          * Try to get the inode.  If the verifiers fail, we try again
  63          * in raw mode.
  64          */
  65         error = xfs_scrub_get_inode(sc, ip);
  66         switch (error) {
  67         case 0:
  68                 break;
  69         case -EFSCORRUPTED:
  70         case -EFSBADCRC:
  71                 return xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
  72         default:
  73                 return error;
  74         }
  75
  76         /* Got the inode, lock it and we're ready to go. */
  77         sc->ilock_flags = XFS_IOLOCK_EXCL | XFS_MMAPLOCK_EXCL;
  78         xfs_ilock(sc->ip, sc->ilock_flags);
  79         error = xfs_scrub_trans_alloc(sc->sm, mp, &sc->tp);
  80         if (error)
  81                 goto out;
  82         sc->ilock_flags |= XFS_ILOCK_EXCL;
  83         xfs_ilock(sc->ip, XFS_ILOCK_EXCL);
  84
  85 out:
  86         /* scrub teardown will unlock and release the inode for us */
  87         return error;
  88 }
  89
  90 /* Inode core */
  91
  92 /*
  93  * Validate di_extsize hint.
  94  *
  95  * The rules are documented at xfs_ioctl_setattr_check_extsize().
  96  * These functions must be kept in sync with each other.
  97  */
  98 STATIC void
  99 xfs_scrub_inode_extsize(
 100         struct xfs_scrub_context        *sc,
 101         struct xfs_buf                  *bp,
 102         struct xfs_dinode               *dip,
 103         xfs_ino_t                       ino,
 104         uint16_t                        mode,
 105         uint16_t                        flags)
 106 {
 107         struct xfs_mount                *mp = sc->mp;
 108         bool                            rt_flag;
 109         bool                            hint_flag;
 110         bool                            inherit_flag;
 111         uint32_t                        extsize;
 112         uint32_t                        extsize_bytes;
 113         uint32_t                        blocksize_bytes;
 114
 115         rt_flag = (flags & XFS_DIFLAG_REALTIME);
 116         hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
 117         inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
 118         extsize = be32_to_cpu(dip->di_extsize);
 119         extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
 120
 121         if (rt_flag)
 122                 blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
 123         else
 124                 blocksize_bytes = mp->m_sb.sb_blocksize;
 125
 126         if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
 127                 goto bad;
 128
 129         if (hint_flag && !S_ISREG(mode))
 130                 goto bad;
 131
 132         if (inherit_flag && !S_ISDIR(mode))
 133                 goto bad;
 134
 135         if ((hint_flag || inherit_flag) && extsize == 0)
 136                 goto bad;
 137
 138         if (!(hint_flag || inherit_flag) && extsize != 0)
 139                 goto bad;
 140
 141         if (extsize_bytes % blocksize_bytes)
 142                 goto bad;
 143
 144         if (extsize > MAXEXTLEN)
 145                 goto bad;
 146
 147         if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
 148                 goto bad;
 149
 150         return;
 151 bad:
 152         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 153 }
 154
 155 /*
 156  * Validate di_cowextsize hint.
 157  *
 158  * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
 159  * These functions must be kept in sync with each other.
 160  */
 161 STATIC void
 162 xfs_scrub_inode_cowextsize(
 163         struct xfs_scrub_context        *sc,
 164         struct xfs_buf                  *bp,
 165         struct xfs_dinode               *dip,
 166         xfs_ino_t                       ino,
 167         uint16_t                        mode,
 168         uint16_t                        flags,
 169         uint64_t                        flags2)
 170 {
 171         struct xfs_mount                *mp = sc->mp;
 172         bool                            rt_flag;
 173         bool                            hint_flag;
 174         uint32_t                        extsize;
 175         uint32_t                        extsize_bytes;
 176
 177         rt_flag = (flags & XFS_DIFLAG_REALTIME);
 178         hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
 179         extsize = be32_to_cpu(dip->di_cowextsize);
 180         extsize_bytes = XFS_FSB_TO_B(sc->mp, extsize);
 181
 182         if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
 183                 goto bad;
 184
 185         if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
 186                 goto bad;
 187
 188         if (hint_flag && extsize == 0)
 189                 goto bad;
 190
 191         if (!hint_flag && extsize != 0)
 192                 goto bad;
 193
 194         if (hint_flag && rt_flag)
 195                 goto bad;
 196
 197         if (extsize_bytes % mp->m_sb.sb_blocksize)
 198                 goto bad;
 199
 200         if (extsize > MAXEXTLEN)
 201                 goto bad;
 202
 203         if (extsize > mp->m_sb.sb_agblocks / 2)
 204                 goto bad;
 205
 206         return;
 207 bad:
 208         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 209 }
 210
 211 /* Make sure the di_flags make sense for the inode. */
 212 STATIC void
 213 xfs_scrub_inode_flags(
 214         struct xfs_scrub_context        *sc,
 215         struct xfs_buf                  *bp,
 216         struct xfs_dinode               *dip,
 217         xfs_ino_t                       ino,
 218         uint16_t                        mode,
 219         uint16_t                        flags)
 220 {
 221         struct xfs_mount                *mp = sc->mp;
 222
 223         if (flags & ~XFS_DIFLAG_ANY)
 224                 goto bad;
 225
 226         /* rt flags require rt device */
 227         if ((flags & (XFS_DIFLAG_REALTIME | XFS_DIFLAG_RTINHERIT)) &&
 228             !mp->m_rtdev_targp)
 229                 goto bad;
 230
 231         /* new rt bitmap flag only valid for rbmino */
 232         if ((flags & XFS_DIFLAG_NEWRTBM) && ino != mp->m_sb.sb_rbmino)
 233                 goto bad;
 234
 235         /* directory-only flags */
 236         if ((flags & (XFS_DIFLAG_RTINHERIT |
 237                      XFS_DIFLAG_EXTSZINHERIT |
 238                      XFS_DIFLAG_PROJINHERIT |
 239                      XFS_DIFLAG_NOSYMLINKS)) &&
 240             !S_ISDIR(mode))
 241                 goto bad;
 242
 243         /* file-only flags */
 244         if ((flags & (XFS_DIFLAG_REALTIME | FS_XFLAG_EXTSIZE)) &&
 245             !S_ISREG(mode))
 246                 goto bad;
 247
 248         /* filestreams and rt make no sense */
 249         if ((flags & XFS_DIFLAG_FILESTREAM) && (flags & XFS_DIFLAG_REALTIME))
 250                 goto bad;
 251
 252         return;
 253 bad:
 254         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 255 }
 256
 257 /* Make sure the di_flags2 make sense for the inode. */
 258 STATIC void
 259 xfs_scrub_inode_flags2(
 260         struct xfs_scrub_context        *sc,
 261         struct xfs_buf                  *bp,
 262         struct xfs_dinode               *dip,
 263         xfs_ino_t                       ino,
 264         uint16_t                        mode,
 265         uint16_t                        flags,
 266         uint64_t                        flags2)
 267 {
 268         struct xfs_mount                *mp = sc->mp;
 269
 270         if (flags2 & ~XFS_DIFLAG2_ANY)
 271                 goto bad;
 272
 273         /* reflink flag requires reflink feature */
 274         if ((flags2 & XFS_DIFLAG2_REFLINK) &&
 275             !xfs_sb_version_hasreflink(&mp->m_sb))
 276                 goto bad;
 277
 278         /* cowextsize flag is checked w.r.t. mode separately */
 279
 280         /* file/dir-only flags */
 281         if ((flags2 & XFS_DIFLAG2_DAX) && !(S_ISREG(mode) || S_ISDIR(mode)))
 282                 goto bad;
 283
 284         /* file-only flags */
 285         if ((flags2 & XFS_DIFLAG2_REFLINK) && !S_ISREG(mode))
 286                 goto bad;
 287
 288         /* realtime and reflink make no sense, currently */
 289         if ((flags & XFS_DIFLAG_REALTIME) && (flags2 & XFS_DIFLAG2_REFLINK))
 290                 goto bad;
 291
 292         /* dax and reflink make no sense, currently */
 293         if ((flags2 & XFS_DIFLAG2_DAX) && (flags2 & XFS_DIFLAG2_REFLINK))
 294                 goto bad;
 295
 296         return;
 297 bad:
 298         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 299 }
 300
 301 /* Scrub all the ondisk inode fields. */
 302 STATIC void
 303 xfs_scrub_dinode(
 304         struct xfs_scrub_context        *sc,
 305         struct xfs_buf                  *bp,
 306         struct xfs_dinode               *dip,
 307         xfs_ino_t                       ino)
 308 {
 309         struct xfs_mount                *mp = sc->mp;
 310         size_t                          fork_recs;
 311         unsigned long long              isize;
 312         uint64_t                        flags2;
 313         uint32_t                        nextents;
 314         uint16_t                        flags;
 315         uint16_t                        mode;
 316
 317         flags = be16_to_cpu(dip->di_flags);
 318         if (dip->di_version >= 3)
 319                 flags2 = be64_to_cpu(dip->di_flags2);
 320         else
 321                 flags2 = 0;
 322
 323         /* di_mode */
 324         mode = be16_to_cpu(dip->di_mode);
 325         switch (mode & S_IFMT) {
 326         case S_IFLNK:
 327         case S_IFREG:
 328         case S_IFDIR:
 329         case S_IFCHR:
 330         case S_IFBLK:
 331         case S_IFIFO:
 332         case S_IFSOCK:
 333                 /* mode is recognized */
 334                 break;
 335         default:
 336                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 337                 break;
 338         }
 339
 340         /* v1/v2 fields */
 341         switch (dip->di_version) {
 342         case 1:
 343                 /*
 344                  * We autoconvert v1 inodes into v2 inodes on writeout,
 345                  * so just mark this inode for preening.
 346                  */
 347                 xfs_scrub_ino_set_preen(sc, ino, bp);
 348                 break;
 349         case 2:
 350         case 3:
 351                 if (dip->di_onlink != 0)
 352                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 353
 354                 if (dip->di_mode == 0 && sc->ip)
 355                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 356
 357                 if (dip->di_projid_hi != 0 &&
 358                     !xfs_sb_version_hasprojid32bit(&mp->m_sb))
 359                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 360                 break;
 361         default:
 362                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 363                 return;
 364         }
 365
 366         /*
 367          * di_uid/di_gid -- -1 isn't invalid, but there's no way that
 368          * userspace could have created that.
 369          */
 370         if (dip->di_uid == cpu_to_be32(-1U) ||
 371             dip->di_gid == cpu_to_be32(-1U))
 372                 xfs_scrub_ino_set_warning(sc, ino, bp);
 373
 374         /* di_format */
 375         switch (dip->di_format) {
 376         case XFS_DINODE_FMT_DEV:
 377                 if (!S_ISCHR(mode) && !S_ISBLK(mode) &&
 378                     !S_ISFIFO(mode) && !S_ISSOCK(mode))
 379                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 380                 break;
 381         case XFS_DINODE_FMT_LOCAL:
 382                 if (!S_ISDIR(mode) && !S_ISLNK(mode))
 383                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 384                 break;
 385         case XFS_DINODE_FMT_EXTENTS:
 386                 if (!S_ISREG(mode) && !S_ISDIR(mode) && !S_ISLNK(mode))
 387                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 388                 break;
 389         case XFS_DINODE_FMT_BTREE:
 390                 if (!S_ISREG(mode) && !S_ISDIR(mode))
 391                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 392                 break;
 393         case XFS_DINODE_FMT_UUID:
 394         default:
 395                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 396                 break;
 397         }
 398
 399         /* di_[amc]time.nsec */
 400         if (be32_to_cpu(dip->di_atime.t_nsec) >= NSEC_PER_SEC)
 401                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 402         if (be32_to_cpu(dip->di_mtime.t_nsec) >= NSEC_PER_SEC)
 403                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 404         if (be32_to_cpu(dip->di_ctime.t_nsec) >= NSEC_PER_SEC)
 405                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 406
 407         /*
 408          * di_size.  xfs_dinode_verify checks for things that screw up
 409          * the VFS such as the upper bit being set and zero-length
 410          * symlinks/directories, but we can do more here.
 411          */
 412         isize = be64_to_cpu(dip->di_size);
 413         if (isize & (1ULL << 63))
 414                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 415
 416         /* Devices, fifos, and sockets must have zero size */
 417         if (!S_ISDIR(mode) && !S_ISREG(mode) && !S_ISLNK(mode) && isize != 0)
 418                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 419
 420         /* Directories can't be larger than the data section size (32G) */
 421         if (S_ISDIR(mode) && (isize == 0 || isize >= XFS_DIR2_SPACE_SIZE))
 422                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 423
 424         /* Symlinks can't be larger than SYMLINK_MAXLEN */
 425         if (S_ISLNK(mode) && (isize == 0 || isize >= XFS_SYMLINK_MAXLEN))
 426                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 427
 428         /*
 429          * Warn if the running kernel can't handle the kinds of offsets
 430          * needed to deal with the file size.  In other words, if the
 431          * pagecache can't cache all the blocks in this file due to
 432          * overly large offsets, flag the inode for admin review.
 433          */
 434         if (isize >= mp->m_super->s_maxbytes)
 435                 xfs_scrub_ino_set_warning(sc, ino, bp);
 436
 437         /* di_nblocks */
 438         if (flags2 & XFS_DIFLAG2_REFLINK) {
 439                 ; /* nblocks can exceed dblocks */
 440         } else if (flags & XFS_DIFLAG_REALTIME) {
 441                 /*
 442                  * nblocks is the sum of data extents (in the rtdev),
 443                  * attr extents (in the datadev), and both forks' bmbt
 444                  * blocks (in the datadev).  This clumsy check is the
 445                  * best we can do without cross-referencing with the
 446                  * inode forks.
 447                  */
 448                 if (be64_to_cpu(dip->di_nblocks) >=
 449                     mp->m_sb.sb_dblocks + mp->m_sb.sb_rblocks)
 450                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 451         } else {
 452                 if (be64_to_cpu(dip->di_nblocks) >= mp->m_sb.sb_dblocks)
 453                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 454         }
 455
 456         xfs_scrub_inode_flags(sc, bp, dip, ino, mode, flags);
 457
 458         xfs_scrub_inode_extsize(sc, bp, dip, ino, mode, flags);
 459
 460         /* di_nextents */
 461         nextents = be32_to_cpu(dip->di_nextents);
 462         fork_recs =  XFS_DFORK_DSIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
 463         switch (dip->di_format) {
 464         case XFS_DINODE_FMT_EXTENTS:
 465                 if (nextents > fork_recs)
 466                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 467                 break;
 468         case XFS_DINODE_FMT_BTREE:
 469                 if (nextents <= fork_recs)
 470                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 471                 break;
 472         default:
 473                 if (nextents != 0)
 474                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 475                 break;
 476         }
 477
 478         /* di_forkoff */
 479         if (XFS_DFORK_APTR(dip) >= (char *)dip + mp->m_sb.sb_inodesize)
 480                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 481         if (dip->di_anextents != 0 && dip->di_forkoff == 0)
 482                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 483         if (dip->di_forkoff == 0 && dip->di_aformat != XFS_DINODE_FMT_EXTENTS)
 484                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 485
 486         /* di_aformat */
 487         if (dip->di_aformat != XFS_DINODE_FMT_LOCAL &&
 488             dip->di_aformat != XFS_DINODE_FMT_EXTENTS &&
 489             dip->di_aformat != XFS_DINODE_FMT_BTREE)
 490                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 491
 492         /* di_anextents */
 493         nextents = be16_to_cpu(dip->di_anextents);
 494         fork_recs =  XFS_DFORK_ASIZE(dip, mp) / sizeof(struct xfs_bmbt_rec);
 495         switch (dip->di_aformat) {
 496         case XFS_DINODE_FMT_EXTENTS:
 497                 if (nextents > fork_recs)
 498                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 499                 break;
 500         case XFS_DINODE_FMT_BTREE:
 501                 if (nextents <= fork_recs)
 502                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 503                 break;
 504         default:
 505                 if (nextents != 0)
 506                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 507         }
 508
 509         if (dip->di_version >= 3) {
 510                 if (be32_to_cpu(dip->di_crtime.t_nsec) >= NSEC_PER_SEC)
 511                         xfs_scrub_ino_set_corrupt(sc, ino, bp);
 512                 xfs_scrub_inode_flags2(sc, bp, dip, ino, mode, flags, flags2);
 513                 xfs_scrub_inode_cowextsize(sc, bp, dip, ino, mode, flags,
 514                                 flags2);
 515         }
 516 }
 517
 518 /* Map and read a raw inode. */
 519 STATIC int
 520 xfs_scrub_inode_map_raw(
 521         struct xfs_scrub_context        *sc,
 522         xfs_ino_t                       ino,
 523         struct xfs_buf                  **bpp,
 524         struct xfs_dinode               **dipp)
 525 {
 526         struct xfs_imap                 imap;
 527         struct xfs_mount                *mp = sc->mp;
 528         struct xfs_buf                  *bp = NULL;
 529         struct xfs_dinode               *dip;
 530         int                             error;
 531
 532         error = xfs_imap(mp, sc->tp, ino, &imap, XFS_IGET_UNTRUSTED);
 533         if (error == -EINVAL) {
 534                 /*
 535                  * Inode could have gotten deleted out from under us;
 536                  * just forget about it.
 537                  */
 538                 error = -ENOENT;
 539                 goto out;
 540         }
 541         if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
 542                         XFS_INO_TO_AGBNO(mp, ino), &error))
 543                 goto out;
 544
 545         error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
 546                         imap.im_blkno, imap.im_len, XBF_UNMAPPED, &bp,
 547                         NULL);
 548         if (!xfs_scrub_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
 549                         XFS_INO_TO_AGBNO(mp, ino), &error))
 550                 goto out;
 551
 552         /*
 553          * Is this really an inode?  We disabled verifiers in the above
 554          * xfs_trans_read_buf call because the inode buffer verifier
 555          * fails on /any/ inode record in the inode cluster with a bad
 556          * magic or version number, not just the one that we're
 557          * checking.  Therefore, grab the buffer unconditionally, attach
 558          * the inode verifiers by hand, and run the inode verifier only
 559          * on the one inode we want.
 560          */
 561         bp->b_ops = &xfs_inode_buf_ops;
 562         dip = xfs_buf_offset(bp, imap.im_boffset);
 563         if (xfs_dinode_verify(mp, ino, dip) != NULL ||
 564             !xfs_dinode_good_version(mp, dip->di_version)) {
 565                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 566                 goto out_buf;
 567         }
 568
 569         /* ...and is it the one we asked for? */
 570         if (be32_to_cpu(dip->di_gen) != sc->sm->sm_gen) {
 571                 error = -ENOENT;
 572                 goto out_buf;
 573         }
 574
 575         *dipp = dip;
 576         *bpp = bp;
 577 out:
 578         return error;
 579 out_buf:
 580         xfs_trans_brelse(sc->tp, bp);
 581         return error;
 582 }
 583
 584 /*
 585  * Make sure the finobt doesn't think this inode is free.
 586  * We don't have to check the inobt ourselves because we got the inode via
 587  * IGET_UNTRUSTED, which checks the inobt for us.
 588  */
 589 static void
 590 xfs_scrub_inode_xref_finobt(
 591         struct xfs_scrub_context        *sc,
 592         xfs_ino_t                       ino)
 593 {
 594         struct xfs_inobt_rec_incore     rec;
 595         xfs_agino_t                     agino;
 596         int                             has_record;
 597         int                             error;
 598
 599         if (!sc->sa.fino_cur)
 600                 return;
 601
 602         agino = XFS_INO_TO_AGINO(sc->mp, ino);
 603
 604         /*
 605          * Try to get the finobt record.  If we can't get it, then we're
 606          * in good shape.
 607          */
 608         error = xfs_inobt_lookup(sc->sa.fino_cur, agino, XFS_LOOKUP_LE,
 609                         &has_record);
 610         if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
 611             !has_record)
 612                 return;
 613
 614         error = xfs_inobt_get_rec(sc->sa.fino_cur, &rec, &has_record);
 615         if (!xfs_scrub_should_check_xref(sc, &error, &sc->sa.fino_cur) ||
 616             !has_record)
 617                 return;
 618
 619         /*
 620          * Otherwise, make sure this record either doesn't cover this inode,
 621          * or that it does but it's marked present.
 622          */
 623         if (rec.ir_startino > agino ||
 624             rec.ir_startino + XFS_INODES_PER_CHUNK <= agino)
 625                 return;
 626
 627         if (rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino))
 628                 xfs_scrub_btree_xref_set_corrupt(sc, sc->sa.fino_cur, 0);
 629 }
 630
 631 /* Cross reference the inode fields with the forks. */
 632 STATIC void
 633 xfs_scrub_inode_xref_bmap(
 634         struct xfs_scrub_context        *sc,
 635         struct xfs_dinode               *dip)
 636 {
 637         xfs_extnum_t                    nextents;
 638         xfs_filblks_t                   count;
 639         xfs_filblks_t                   acount;
 640         int                             error;
 641
 642         /* Walk all the extents to check nextents/naextents/nblocks. */
 643         error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_DATA_FORK,
 644                         &nextents, &count);
 645         if (!xfs_scrub_should_check_xref(sc, &error, NULL))
 646                 return;
 647         if (nextents < be32_to_cpu(dip->di_nextents))
 648                 xfs_scrub_ino_xref_set_corrupt(sc, sc->ip->i_ino, NULL);
 649
 650         error = xfs_bmap_count_blocks(sc->tp, sc->ip, XFS_ATTR_FORK,
 651                         &nextents, &acount);
 652         if (!xfs_scrub_should_check_xref(sc, &error, NULL))
 653                 return;
 654         if (nextents != be16_to_cpu(dip->di_anextents))
 655                 xfs_scrub_ino_xref_set_corrupt(sc, sc->ip->i_ino, NULL);
 656
 657         /* Check nblocks against the inode. */
 658         if (count + acount != be64_to_cpu(dip->di_nblocks))
 659                 xfs_scrub_ino_xref_set_corrupt(sc, sc->ip->i_ino, NULL);
 660 }
 661
 662 /* Cross-reference with the other btrees. */
 663 STATIC void
 664 xfs_scrub_inode_xref(
 665         struct xfs_scrub_context        *sc,
 666         xfs_ino_t                       ino,
 667         struct xfs_dinode               *dip)
 668 {
 669         struct xfs_owner_info           oinfo;
 670         xfs_agnumber_t                  agno;
 671         xfs_agblock_t                   agbno;
 672         int                             error;
 673
 674         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 675                 return;
 676
 677         agno = XFS_INO_TO_AGNO(sc->mp, ino);
 678         agbno = XFS_INO_TO_AGBNO(sc->mp, ino);
 679
 680         error = xfs_scrub_ag_init(sc, agno, &sc->sa);
 681         if (!xfs_scrub_xref_process_error(sc, agno, agbno, &error))
 682                 return;
 683
 684         xfs_scrub_xref_is_used_space(sc, agbno, 1);
 685         xfs_scrub_inode_xref_finobt(sc, ino);
 686         xfs_rmap_ag_owner(&oinfo, XFS_RMAP_OWN_INODES);
 687         xfs_scrub_xref_is_owned_by(sc, agbno, 1, &oinfo);
 688         xfs_scrub_xref_is_not_shared(sc, agbno, 1);
 689         xfs_scrub_inode_xref_bmap(sc, dip);
 690
 691         xfs_scrub_ag_free(sc, &sc->sa);
 692 }
 693
 694 /*
 695  * If the reflink iflag disagrees with a scan for shared data fork extents,
 696  * either flag an error (shared extents w/ no flag) or a preen (flag set w/o
 697  * any shared extents).  We already checked for reflink iflag set on a non
 698  * reflink filesystem.
 699  */
 700 static void
 701 xfs_scrub_inode_check_reflink_iflag(
 702         struct xfs_scrub_context        *sc,
 703         xfs_ino_t                       ino,
 704         struct xfs_buf                  *bp)
 705 {
 706         struct xfs_mount                *mp = sc->mp;
 707         bool                            has_shared;
 708         int                             error;
 709
 710         if (!xfs_sb_version_hasreflink(&mp->m_sb))
 711                 return;
 712
 713         error = xfs_reflink_inode_has_shared_extents(sc->tp, sc->ip,
 714                         &has_shared);
 715         if (!xfs_scrub_xref_process_error(sc, XFS_INO_TO_AGNO(mp, ino),
 716                         XFS_INO_TO_AGBNO(mp, ino), &error))
 717                 return;
 718         if (xfs_is_reflink_inode(sc->ip) && !has_shared)
 719                 xfs_scrub_ino_set_preen(sc, ino, bp);
 720         else if (!xfs_is_reflink_inode(sc->ip) && has_shared)
 721                 xfs_scrub_ino_set_corrupt(sc, ino, bp);
 722 }
 723
 724 /* Scrub an inode. */
 725 int
 726 xfs_scrub_inode(
 727         struct xfs_scrub_context        *sc)
 728 {
 729         struct xfs_dinode               di;
 730         struct xfs_buf                  *bp = NULL;
 731         struct xfs_dinode               *dip;
 732         xfs_ino_t                       ino;
 733         int                             error = 0;
 734
 735         /* Did we get the in-core inode, or are we doing this manually? */
 736         if (sc->ip) {
 737                 ino = sc->ip->i_ino;
 738                 xfs_inode_to_disk(sc->ip, &di, 0);
 739                 dip = &di;
 740         } else {
 741                 /* Map & read inode. */
 742                 ino = sc->sm->sm_ino;
 743                 error = xfs_scrub_inode_map_raw(sc, ino, &bp, &dip);
 744                 if (error || !bp)
 745                         goto out;
 746         }
 747
 748         xfs_scrub_dinode(sc, bp, dip, ino);
 749         if (sc->sm->sm_flags & XFS_SCRUB_OFLAG_CORRUPT)
 750                 goto out;
 751
 752         /* Now let's do the things that require a live inode. */
 753         if (!sc->ip)
 754                 goto out;
 755
 756         /*
 757          * Look for discrepancies between file's data blocks and the reflink
 758          * iflag.  We already checked the iflag against the file mode when
 759          * we scrubbed the dinode.
 760          */
 761         if (S_ISREG(VFS_I(sc->ip)->i_mode))
 762                 xfs_scrub_inode_check_reflink_iflag(sc, ino, bp);
 763
 764         xfs_scrub_inode_xref(sc, ino, dip);
 765 out:
 766         if (bp)
 767                 xfs_trans_brelse(sc->tp, bp);
 768         return error;
 769 }