fs/xfs/libxfs/xfs_inode_buf.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2006 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_defer.h"
  14 #include "xfs_inode.h"
  15 #include "xfs_errortag.h"
  16 #include "xfs_error.h"
  17 #include "xfs_cksum.h"
  18 #include "xfs_icache.h"
  19 #include "xfs_trans.h"
  20 #include "xfs_ialloc.h"
  21 #include "xfs_dir2.h"
  22
  23 #include <linux/iversion.h>
  24
  25 /*
  26  * Check that none of the inode's in the buffer have a next
  27  * unlinked field of 0.
  28  */
  29 #if defined(DEBUG)
  30 void
  31 xfs_inobp_check(
  32         xfs_mount_t     *mp,
  33         xfs_buf_t       *bp)
  34 {
  35         int             i;
  36         int             j;
  37         xfs_dinode_t    *dip;
  38
  39         j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
  40
  41         for (i = 0; i < j; i++) {
  42                 dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
  43                 if (!dip->di_next_unlinked)  {
  44                         xfs_alert(mp,
  45         "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
  46                                 i, (long long)bp->b_bn);
  47                 }
  48         }
  49 }
  50 #endif
  51
  52 bool
  53 xfs_dinode_good_version(
  54         struct xfs_mount *mp,
  55         __u8            version)
  56 {
  57         if (xfs_sb_version_hascrc(&mp->m_sb))
  58                 return version == 3;
  59
  60         return version == 1 || version == 2;
  61 }
  62
  63 /*
  64  * If we are doing readahead on an inode buffer, we might be in log recovery
  65  * reading an inode allocation buffer that hasn't yet been replayed, and hence
  66  * has not had the inode cores stamped into it. Hence for readahead, the buffer
  67  * may be potentially invalid.
  68  *
  69  * If the readahead buffer is invalid, we need to mark it with an error and
  70  * clear the DONE status of the buffer so that a followup read will re-read it
  71  * from disk. We don't report the error otherwise to avoid warnings during log
  72  * recovery and we don't get unnecssary panics on debug kernels. We use EIO here
  73  * because all we want to do is say readahead failed; there is no-one to report
  74  * the error to, so this will distinguish it from a non-ra verifier failure.
  75  * Changes to this readahead error behavour also need to be reflected in
  76  * xfs_dquot_buf_readahead_verify().
  77  */
  78 static void
  79 xfs_inode_buf_verify(
  80         struct xfs_buf  *bp,
  81         bool            readahead)
  82 {
  83         struct xfs_mount *mp = bp->b_target->bt_mount;
  84         xfs_agnumber_t  agno;
  85         int             i;
  86         int             ni;
  87
  88         /*
  89          * Validate the magic number and version of every inode in the buffer
  90          */
  91         agno = xfs_daddr_to_agno(mp, XFS_BUF_ADDR(bp));
  92         ni = XFS_BB_TO_FSB(mp, bp->b_length) * mp->m_sb.sb_inopblock;
  93         for (i = 0; i < ni; i++) {
  94                 int             di_ok;
  95                 xfs_dinode_t    *dip;
  96                 xfs_agino_t     unlinked_ino;
  97
  98                 dip = xfs_buf_offset(bp, (i << mp->m_sb.sb_inodelog));
  99                 unlinked_ino = be32_to_cpu(dip->di_next_unlinked);
 100                 di_ok = dip->di_magic == cpu_to_be16(XFS_DINODE_MAGIC) &&
 101                         xfs_dinode_good_version(mp, dip->di_version) &&
 102                         (unlinked_ino == NULLAGINO ||
 103                          xfs_verify_agino(mp, agno, unlinked_ino));
 104                 if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
 105                                                 XFS_ERRTAG_ITOBP_INOTOBP))) {
 106                         if (readahead) {
 107                                 bp->b_flags &= ~XBF_DONE;
 108                                 xfs_buf_ioerror(bp, -EIO);
 109                                 return;
 110                         }
 111
 112 #ifdef DEBUG
 113                         xfs_alert(mp,
 114                                 "bad inode magic/vsn daddr %lld #%d (magic=%x)",
 115                                 (unsigned long long)bp->b_bn, i,
 116                                 be16_to_cpu(dip->di_magic));
 117 #endif
 118                         xfs_buf_verifier_error(bp, -EFSCORRUPTED,
 119                                         __func__, dip, sizeof(*dip),
 120                                         NULL);
 121                         return;
 122                 }
 123         }
 124 }
 125
 126
 127 static void
 128 xfs_inode_buf_read_verify(
 129         struct xfs_buf  *bp)
 130 {
 131         xfs_inode_buf_verify(bp, false);
 132 }
 133
 134 static void
 135 xfs_inode_buf_readahead_verify(
 136         struct xfs_buf  *bp)
 137 {
 138         xfs_inode_buf_verify(bp, true);
 139 }
 140
 141 static void
 142 xfs_inode_buf_write_verify(
 143         struct xfs_buf  *bp)
 144 {
 145         xfs_inode_buf_verify(bp, false);
 146 }
 147
 148 const struct xfs_buf_ops xfs_inode_buf_ops = {
 149         .name = "xfs_inode",
 150         .verify_read = xfs_inode_buf_read_verify,
 151         .verify_write = xfs_inode_buf_write_verify,
 152 };
 153
 154 const struct xfs_buf_ops xfs_inode_buf_ra_ops = {
 155         .name = "xxfs_inode_ra",
 156         .verify_read = xfs_inode_buf_readahead_verify,
 157         .verify_write = xfs_inode_buf_write_verify,
 158 };
 159
 160
 161 /*
 162  * This routine is called to map an inode to the buffer containing the on-disk
 163  * version of the inode.  It returns a pointer to the buffer containing the
 164  * on-disk inode in the bpp parameter, and in the dipp parameter it returns a
 165  * pointer to the on-disk inode within that buffer.
 166  *
 167  * If a non-zero error is returned, then the contents of bpp and dipp are
 168  * undefined.
 169  */
 170 int
 171 xfs_imap_to_bp(
 172         struct xfs_mount        *mp,
 173         struct xfs_trans        *tp,
 174         struct xfs_imap         *imap,
 175         struct xfs_dinode       **dipp,
 176         struct xfs_buf          **bpp,
 177         uint                    buf_flags,
 178         uint                    iget_flags)
 179 {
 180         struct xfs_buf          *bp;
 181         int                     error;
 182
 183         buf_flags |= XBF_UNMAPPED;
 184         error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
 185                                    (int)imap->im_len, buf_flags, &bp,
 186                                    &xfs_inode_buf_ops);
 187         if (error) {
 188                 if (error == -EAGAIN) {
 189                         ASSERT(buf_flags & XBF_TRYLOCK);
 190                         return error;
 191                 }
 192                 xfs_warn(mp, "%s: xfs_trans_read_buf() returned error %d.",
 193                         __func__, error);
 194                 return error;
 195         }
 196
 197         *bpp = bp;
 198         *dipp = xfs_buf_offset(bp, imap->im_boffset);
 199         return 0;
 200 }
 201
 202 void
 203 xfs_inode_from_disk(
 204         struct xfs_inode        *ip,
 205         struct xfs_dinode       *from)
 206 {
 207         struct xfs_icdinode     *to = &ip->i_d;
 208         struct inode            *inode = VFS_I(ip);
 209
 210
 211         /*
 212          * Convert v1 inodes immediately to v2 inode format as this is the
 213          * minimum inode version format we support in the rest of the code.
 214          */
 215         to->di_version = from->di_version;
 216         if (to->di_version == 1) {
 217                 set_nlink(inode, be16_to_cpu(from->di_onlink));
 218                 to->di_projid_lo = 0;
 219                 to->di_projid_hi = 0;
 220                 to->di_version = 2;
 221         } else {
 222                 set_nlink(inode, be32_to_cpu(from->di_nlink));
 223                 to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
 224                 to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
 225         }
 226
 227         to->di_format = from->di_format;
 228         to->di_uid = be32_to_cpu(from->di_uid);
 229         to->di_gid = be32_to_cpu(from->di_gid);
 230         to->di_flushiter = be16_to_cpu(from->di_flushiter);
 231
 232         /*
 233          * Time is signed, so need to convert to signed 32 bit before
 234          * storing in inode timestamp which may be 64 bit. Otherwise
 235          * a time before epoch is converted to a time long after epoch
 236          * on 64 bit systems.
 237          */
 238         inode->i_atime.tv_sec = (int)be32_to_cpu(from->di_atime.t_sec);
 239         inode->i_atime.tv_nsec = (int)be32_to_cpu(from->di_atime.t_nsec);
 240         inode->i_mtime.tv_sec = (int)be32_to_cpu(from->di_mtime.t_sec);
 241         inode->i_mtime.tv_nsec = (int)be32_to_cpu(from->di_mtime.t_nsec);
 242         inode->i_ctime.tv_sec = (int)be32_to_cpu(from->di_ctime.t_sec);
 243         inode->i_ctime.tv_nsec = (int)be32_to_cpu(from->di_ctime.t_nsec);
 244         inode->i_generation = be32_to_cpu(from->di_gen);
 245         inode->i_mode = be16_to_cpu(from->di_mode);
 246
 247         to->di_size = be64_to_cpu(from->di_size);
 248         to->di_nblocks = be64_to_cpu(from->di_nblocks);
 249         to->di_extsize = be32_to_cpu(from->di_extsize);
 250         to->di_nextents = be32_to_cpu(from->di_nextents);
 251         to->di_anextents = be16_to_cpu(from->di_anextents);
 252         to->di_forkoff = from->di_forkoff;
 253         to->di_aformat  = from->di_aformat;
 254         to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
 255         to->di_dmstate  = be16_to_cpu(from->di_dmstate);
 256         to->di_flags    = be16_to_cpu(from->di_flags);
 257
 258         if (to->di_version == 3) {
 259                 inode_set_iversion_queried(inode,
 260                                            be64_to_cpu(from->di_changecount));
 261                 to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
 262                 to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
 263                 to->di_flags2 = be64_to_cpu(from->di_flags2);
 264                 to->di_cowextsize = be32_to_cpu(from->di_cowextsize);
 265         }
 266 }
 267
 268 void
 269 xfs_inode_to_disk(
 270         struct xfs_inode        *ip,
 271         struct xfs_dinode       *to,
 272         xfs_lsn_t               lsn)
 273 {
 274         struct xfs_icdinode     *from = &ip->i_d;
 275         struct inode            *inode = VFS_I(ip);
 276
 277         to->di_magic = cpu_to_be16(XFS_DINODE_MAGIC);
 278         to->di_onlink = 0;
 279
 280         to->di_version = from->di_version;
 281         to->di_format = from->di_format;
 282         to->di_uid = cpu_to_be32(from->di_uid);
 283         to->di_gid = cpu_to_be32(from->di_gid);
 284         to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
 285         to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
 286
 287         memset(to->di_pad, 0, sizeof(to->di_pad));
 288         to->di_atime.t_sec = cpu_to_be32(inode->i_atime.tv_sec);
 289         to->di_atime.t_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
 290         to->di_mtime.t_sec = cpu_to_be32(inode->i_mtime.tv_sec);
 291         to->di_mtime.t_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
 292         to->di_ctime.t_sec = cpu_to_be32(inode->i_ctime.tv_sec);
 293         to->di_ctime.t_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
 294         to->di_nlink = cpu_to_be32(inode->i_nlink);
 295         to->di_gen = cpu_to_be32(inode->i_generation);
 296         to->di_mode = cpu_to_be16(inode->i_mode);
 297
 298         to->di_size = cpu_to_be64(from->di_size);
 299         to->di_nblocks = cpu_to_be64(from->di_nblocks);
 300         to->di_extsize = cpu_to_be32(from->di_extsize);
 301         to->di_nextents = cpu_to_be32(from->di_nextents);
 302         to->di_anextents = cpu_to_be16(from->di_anextents);
 303         to->di_forkoff = from->di_forkoff;
 304         to->di_aformat = from->di_aformat;
 305         to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
 306         to->di_dmstate = cpu_to_be16(from->di_dmstate);
 307         to->di_flags = cpu_to_be16(from->di_flags);
 308
 309         if (from->di_version == 3) {
 310                 to->di_changecount = cpu_to_be64(inode_peek_iversion(inode));
 311                 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
 312                 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
 313                 to->di_flags2 = cpu_to_be64(from->di_flags2);
 314                 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
 315                 to->di_ino = cpu_to_be64(ip->i_ino);
 316                 to->di_lsn = cpu_to_be64(lsn);
 317                 memset(to->di_pad2, 0, sizeof(to->di_pad2));
 318                 uuid_copy(&to->di_uuid, &ip->i_mount->m_sb.sb_meta_uuid);
 319                 to->di_flushiter = 0;
 320         } else {
 321                 to->di_flushiter = cpu_to_be16(from->di_flushiter);
 322         }
 323 }
 324
 325 void
 326 xfs_log_dinode_to_disk(
 327         struct xfs_log_dinode   *from,
 328         struct xfs_dinode       *to)
 329 {
 330         to->di_magic = cpu_to_be16(from->di_magic);
 331         to->di_mode = cpu_to_be16(from->di_mode);
 332         to->di_version = from->di_version;
 333         to->di_format = from->di_format;
 334         to->di_onlink = 0;
 335         to->di_uid = cpu_to_be32(from->di_uid);
 336         to->di_gid = cpu_to_be32(from->di_gid);
 337         to->di_nlink = cpu_to_be32(from->di_nlink);
 338         to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
 339         to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
 340         memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
 341
 342         to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
 343         to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
 344         to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
 345         to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
 346         to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
 347         to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
 348
 349         to->di_size = cpu_to_be64(from->di_size);
 350         to->di_nblocks = cpu_to_be64(from->di_nblocks);
 351         to->di_extsize = cpu_to_be32(from->di_extsize);
 352         to->di_nextents = cpu_to_be32(from->di_nextents);
 353         to->di_anextents = cpu_to_be16(from->di_anextents);
 354         to->di_forkoff = from->di_forkoff;
 355         to->di_aformat = from->di_aformat;
 356         to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
 357         to->di_dmstate = cpu_to_be16(from->di_dmstate);
 358         to->di_flags = cpu_to_be16(from->di_flags);
 359         to->di_gen = cpu_to_be32(from->di_gen);
 360
 361         if (from->di_version == 3) {
 362                 to->di_changecount = cpu_to_be64(from->di_changecount);
 363                 to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
 364                 to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
 365                 to->di_flags2 = cpu_to_be64(from->di_flags2);
 366                 to->di_cowextsize = cpu_to_be32(from->di_cowextsize);
 367                 to->di_ino = cpu_to_be64(from->di_ino);
 368                 to->di_lsn = cpu_to_be64(from->di_lsn);
 369                 memcpy(to->di_pad2, from->di_pad2, sizeof(to->di_pad2));
 370                 uuid_copy(&to->di_uuid, &from->di_uuid);
 371                 to->di_flushiter = 0;
 372         } else {
 373                 to->di_flushiter = cpu_to_be16(from->di_flushiter);
 374         }
 375 }
 376
 377 static xfs_failaddr_t
 378 xfs_dinode_verify_fork(
 379         struct xfs_dinode       *dip,
 380         struct xfs_mount        *mp,
 381         int                     whichfork)
 382 {
 383         uint32_t                di_nextents = XFS_DFORK_NEXTENTS(dip, whichfork);
 384
 385         switch (XFS_DFORK_FORMAT(dip, whichfork)) {
 386         case XFS_DINODE_FMT_LOCAL:
 387                 /*
 388                  * no local regular files yet
 389                  */
 390                 if (whichfork == XFS_DATA_FORK) {
 391                         if (S_ISREG(be16_to_cpu(dip->di_mode)))
 392                                 return __this_address;
 393                         if (be64_to_cpu(dip->di_size) >
 394                                         XFS_DFORK_SIZE(dip, mp, whichfork))
 395                                 return __this_address;
 396                 }
 397                 if (di_nextents)
 398                         return __this_address;
 399                 break;
 400         case XFS_DINODE_FMT_EXTENTS:
 401                 if (di_nextents > XFS_DFORK_MAXEXT(dip, mp, whichfork))
 402                         return __this_address;
 403                 break;
 404         case XFS_DINODE_FMT_BTREE:
 405                 if (whichfork == XFS_ATTR_FORK) {
 406                         if (di_nextents > MAXAEXTNUM)
 407                                 return __this_address;
 408                 } else if (di_nextents > MAXEXTNUM) {
 409                         return __this_address;
 410                 }
 411                 break;
 412         default:
 413                 return __this_address;
 414         }
 415         return NULL;
 416 }
 417
 418 static xfs_failaddr_t
 419 xfs_dinode_verify_forkoff(
 420         struct xfs_dinode       *dip,
 421         struct xfs_mount        *mp)
 422 {
 423         if (!XFS_DFORK_Q(dip))
 424                 return NULL;
 425
 426         switch (dip->di_format)  {
 427         case XFS_DINODE_FMT_DEV:
 428                 if (dip->di_forkoff != (roundup(sizeof(xfs_dev_t), 8) >> 3))
 429                         return __this_address;
 430                 break;
 431         case XFS_DINODE_FMT_LOCAL:      /* fall through ... */
 432         case XFS_DINODE_FMT_EXTENTS:    /* fall through ... */
 433         case XFS_DINODE_FMT_BTREE:
 434                 if (dip->di_forkoff >= (XFS_LITINO(mp, dip->di_version) >> 3))
 435                         return __this_address;
 436                 break;
 437         default:
 438                 return __this_address;
 439         }
 440         return NULL;
 441 }
 442
 443 xfs_failaddr_t
 444 xfs_dinode_verify(
 445         struct xfs_mount        *mp,
 446         xfs_ino_t               ino,
 447         struct xfs_dinode       *dip)
 448 {
 449         xfs_failaddr_t          fa;
 450         uint16_t                mode;
 451         uint16_t                flags;
 452         uint64_t                flags2;
 453         uint64_t                di_size;
 454
 455         if (dip->di_magic != cpu_to_be16(XFS_DINODE_MAGIC))
 456                 return __this_address;
 457
 458         /* Verify v3 integrity information first */
 459         if (dip->di_version >= 3) {
 460                 if (!xfs_sb_version_hascrc(&mp->m_sb))
 461                         return __this_address;
 462                 if (!xfs_verify_cksum((char *)dip, mp->m_sb.sb_inodesize,
 463                                       XFS_DINODE_CRC_OFF))
 464                         return __this_address;
 465                 if (be64_to_cpu(dip->di_ino) != ino)
 466                         return __this_address;
 467                 if (!uuid_equal(&dip->di_uuid, &mp->m_sb.sb_meta_uuid))
 468                         return __this_address;
 469         }
 470
 471         /* don't allow invalid i_size */
 472         di_size = be64_to_cpu(dip->di_size);
 473         if (di_size & (1ULL << 63))
 474                 return __this_address;
 475
 476         mode = be16_to_cpu(dip->di_mode);
 477         if (mode && xfs_mode_to_ftype(mode) == XFS_DIR3_FT_UNKNOWN)
 478                 return __this_address;
 479
 480         /* No zero-length symlinks/dirs. */
 481         if ((S_ISLNK(mode) || S_ISDIR(mode)) && di_size == 0)
 482                 return __this_address;
 483
 484         /* Fork checks carried over from xfs_iformat_fork */
 485         if (mode &&
 486             be32_to_cpu(dip->di_nextents) + be16_to_cpu(dip->di_anextents) >
 487                         be64_to_cpu(dip->di_nblocks))
 488                 return __this_address;
 489
 490         if (mode && XFS_DFORK_BOFF(dip) > mp->m_sb.sb_inodesize)
 491                 return __this_address;
 492
 493         flags = be16_to_cpu(dip->di_flags);
 494
 495         if (mode && (flags & XFS_DIFLAG_REALTIME) && !mp->m_rtdev_targp)
 496                 return __this_address;
 497
 498         /* check for illegal values of forkoff */
 499         fa = xfs_dinode_verify_forkoff(dip, mp);
 500         if (fa)
 501                 return fa;
 502
 503         /* Do we have appropriate data fork formats for the mode? */
 504         switch (mode & S_IFMT) {
 505         case S_IFIFO:
 506         case S_IFCHR:
 507         case S_IFBLK:
 508         case S_IFSOCK:
 509                 if (dip->di_format != XFS_DINODE_FMT_DEV)
 510                         return __this_address;
 511                 break;
 512         case S_IFREG:
 513         case S_IFLNK:
 514         case S_IFDIR:
 515                 fa = xfs_dinode_verify_fork(dip, mp, XFS_DATA_FORK);
 516                 if (fa)
 517                         return fa;
 518                 break;
 519         case 0:
 520                 /* Uninitialized inode ok. */
 521                 break;
 522         default:
 523                 return __this_address;
 524         }
 525
 526         if (XFS_DFORK_Q(dip)) {
 527                 fa = xfs_dinode_verify_fork(dip, mp, XFS_ATTR_FORK);
 528                 if (fa)
 529                         return fa;
 530         } else {
 531                 /*
 532                  * If there is no fork offset, this may be a freshly-made inode
 533                  * in a new disk cluster, in which case di_aformat is zeroed.
 534                  * Otherwise, such an inode must be in EXTENTS format; this goes
 535                  * for freed inodes as well.
 536                  */
 537                 switch (dip->di_aformat) {
 538                 case 0:
 539                 case XFS_DINODE_FMT_EXTENTS:
 540                         break;
 541                 default:
 542                         return __this_address;
 543                 }
 544                 if (dip->di_anextents)
 545                         return __this_address;
 546         }
 547
 548         /* extent size hint validation */
 549         fa = xfs_inode_validate_extsize(mp, be32_to_cpu(dip->di_extsize),
 550                         mode, flags);
 551         if (fa)
 552                 return fa;
 553
 554         /* only version 3 or greater inodes are extensively verified here */
 555         if (dip->di_version < 3)
 556                 return NULL;
 557
 558         flags2 = be64_to_cpu(dip->di_flags2);
 559
 560         /* don't allow reflink/cowextsize if we don't have reflink */
 561         if ((flags2 & (XFS_DIFLAG2_REFLINK | XFS_DIFLAG2_COWEXTSIZE)) &&
 562              !xfs_sb_version_hasreflink(&mp->m_sb))
 563                 return __this_address;
 564
 565         /* only regular files get reflink */
 566         if ((flags2 & XFS_DIFLAG2_REFLINK) && (mode & S_IFMT) != S_IFREG)
 567                 return __this_address;
 568
 569         /* don't let reflink and realtime mix */
 570         if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags & XFS_DIFLAG_REALTIME))
 571                 return __this_address;
 572
 573         /* don't let reflink and dax mix */
 574         if ((flags2 & XFS_DIFLAG2_REFLINK) && (flags2 & XFS_DIFLAG2_DAX))
 575                 return __this_address;
 576
 577         /* COW extent size hint validation */
 578         fa = xfs_inode_validate_cowextsize(mp, be32_to_cpu(dip->di_cowextsize),
 579                         mode, flags, flags2);
 580         if (fa)
 581                 return fa;
 582
 583         return NULL;
 584 }
 585
 586 void
 587 xfs_dinode_calc_crc(
 588         struct xfs_mount        *mp,
 589         struct xfs_dinode       *dip)
 590 {
 591         uint32_t                crc;
 592
 593         if (dip->di_version < 3)
 594                 return;
 595
 596         ASSERT(xfs_sb_version_hascrc(&mp->m_sb));
 597         crc = xfs_start_cksum_update((char *)dip, mp->m_sb.sb_inodesize,
 598                               XFS_DINODE_CRC_OFF);
 599         dip->di_crc = xfs_end_cksum(crc);
 600 }
 601
 602 /*
 603  * Read the disk inode attributes into the in-core inode structure.
 604  *
 605  * For version 5 superblocks, if we are initialising a new inode and we are not
 606  * utilising the XFS_MOUNT_IKEEP inode cluster mode, we can simple build the new
 607  * inode core with a random generation number. If we are keeping inodes around,
 608  * we need to read the inode cluster to get the existing generation number off
 609  * disk. Further, if we are using version 4 superblocks (i.e. v1/v2 inode
 610  * format) then log recovery is dependent on the di_flushiter field being
 611  * initialised from the current on-disk value and hence we must also read the
 612  * inode off disk.
 613  */
 614 int
 615 xfs_iread(
 616         xfs_mount_t     *mp,
 617         xfs_trans_t     *tp,
 618         xfs_inode_t     *ip,
 619         uint            iget_flags)
 620 {
 621         xfs_buf_t       *bp;
 622         xfs_dinode_t    *dip;
 623         xfs_failaddr_t  fa;
 624         int             error;
 625
 626         /*
 627          * Fill in the location information in the in-core inode.
 628          */
 629         error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
 630         if (error)
 631                 return error;
 632
 633         /* shortcut IO on inode allocation if possible */
 634         if ((iget_flags & XFS_IGET_CREATE) &&
 635             xfs_sb_version_hascrc(&mp->m_sb) &&
 636             !(mp->m_flags & XFS_MOUNT_IKEEP)) {
 637                 /* initialise the on-disk inode core */
 638                 memset(&ip->i_d, 0, sizeof(ip->i_d));
 639                 VFS_I(ip)->i_generation = prandom_u32();
 640                 ip->i_d.di_version = 3;
 641                 return 0;
 642         }
 643
 644         /*
 645          * Get pointers to the on-disk inode and the buffer containing it.
 646          */
 647         error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &dip, &bp, 0, iget_flags);
 648         if (error)
 649                 return error;
 650
 651         /* even unallocated inodes are verified */
 652         fa = xfs_dinode_verify(mp, ip->i_ino, dip);
 653         if (fa) {
 654                 xfs_inode_verifier_error(ip, -EFSCORRUPTED, "dinode", dip,
 655                                 sizeof(*dip), fa);
 656                 error = -EFSCORRUPTED;
 657                 goto out_brelse;
 658         }
 659
 660         /*
 661          * If the on-disk inode is already linked to a directory
 662          * entry, copy all of the inode into the in-core inode.
 663          * xfs_iformat_fork() handles copying in the inode format
 664          * specific information.
 665          * Otherwise, just get the truly permanent information.
 666          */
 667         if (dip->di_mode) {
 668                 xfs_inode_from_disk(ip, dip);
 669                 error = xfs_iformat_fork(ip, dip);
 670                 if (error)  {
 671 #ifdef DEBUG
 672                         xfs_alert(mp, "%s: xfs_iformat() returned error %d",
 673                                 __func__, error);
 674 #endif /* DEBUG */
 675                         goto out_brelse;
 676                 }
 677         } else {
 678                 /*
 679                  * Partial initialisation of the in-core inode. Just the bits
 680                  * that xfs_ialloc won't overwrite or relies on being correct.
 681                  */
 682                 ip->i_d.di_version = dip->di_version;
 683                 VFS_I(ip)->i_generation = be32_to_cpu(dip->di_gen);
 684                 ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
 685
 686                 /*
 687                  * Make sure to pull in the mode here as well in
 688                  * case the inode is released without being used.
 689                  * This ensures that xfs_inactive() will see that
 690                  * the inode is already free and not try to mess
 691                  * with the uninitialized part of it.
 692                  */
 693                 VFS_I(ip)->i_mode = 0;
 694         }
 695
 696         ASSERT(ip->i_d.di_version >= 2);
 697         ip->i_delayed_blks = 0;
 698
 699         /*
 700          * Mark the buffer containing the inode as something to keep
 701          * around for a while.  This helps to keep recently accessed
 702          * meta-data in-core longer.
 703          */
 704         xfs_buf_set_ref(bp, XFS_INO_REF);
 705
 706         /*
 707          * Use xfs_trans_brelse() to release the buffer containing the on-disk
 708          * inode, because it was acquired with xfs_trans_read_buf() in
 709          * xfs_imap_to_bp() above.  If tp is NULL, this is just a normal
 710          * brelse().  If we're within a transaction, then xfs_trans_brelse()
 711          * will only release the buffer if it is not dirty within the
 712          * transaction.  It will be OK to release the buffer in this case,
 713          * because inodes on disk are never destroyed and we will be locking the
 714          * new in-core inode before putting it in the cache where other
 715          * processes can find it.  Thus we don't have to worry about the inode
 716          * being changed just because we released the buffer.
 717          */
 718  out_brelse:
 719         xfs_trans_brelse(tp, bp);
 720         return error;
 721 }
 722
 723 /*
 724  * Validate di_extsize hint.
 725  *
 726  * The rules are documented at xfs_ioctl_setattr_check_extsize().
 727  * These functions must be kept in sync with each other.
 728  */
 729 xfs_failaddr_t
 730 xfs_inode_validate_extsize(
 731         struct xfs_mount                *mp,
 732         uint32_t                        extsize,
 733         uint16_t                        mode,
 734         uint16_t                        flags)
 735 {
 736         bool                            rt_flag;
 737         bool                            hint_flag;
 738         bool                            inherit_flag;
 739         uint32_t                        extsize_bytes;
 740         uint32_t                        blocksize_bytes;
 741
 742         rt_flag = (flags & XFS_DIFLAG_REALTIME);
 743         hint_flag = (flags & XFS_DIFLAG_EXTSIZE);
 744         inherit_flag = (flags & XFS_DIFLAG_EXTSZINHERIT);
 745         extsize_bytes = XFS_FSB_TO_B(mp, extsize);
 746
 747         if (rt_flag)
 748                 blocksize_bytes = mp->m_sb.sb_rextsize << mp->m_sb.sb_blocklog;
 749         else
 750                 blocksize_bytes = mp->m_sb.sb_blocksize;
 751
 752         if ((hint_flag || inherit_flag) && !(S_ISDIR(mode) || S_ISREG(mode)))
 753                 return __this_address;
 754
 755         if (hint_flag && !S_ISREG(mode))
 756                 return __this_address;
 757
 758         if (inherit_flag && !S_ISDIR(mode))
 759                 return __this_address;
 760
 761         if ((hint_flag || inherit_flag) && extsize == 0)
 762                 return __this_address;
 763
 764         /* free inodes get flags set to zero but extsize remains */
 765         if (mode && !(hint_flag || inherit_flag) && extsize != 0)
 766                 return __this_address;
 767
 768         if (extsize_bytes % blocksize_bytes)
 769                 return __this_address;
 770
 771         if (extsize > MAXEXTLEN)
 772                 return __this_address;
 773
 774         if (!rt_flag && extsize > mp->m_sb.sb_agblocks / 2)
 775                 return __this_address;
 776
 777         return NULL;
 778 }
 779
 780 /*
 781  * Validate di_cowextsize hint.
 782  *
 783  * The rules are documented at xfs_ioctl_setattr_check_cowextsize().
 784  * These functions must be kept in sync with each other.
 785  */
 786 xfs_failaddr_t
 787 xfs_inode_validate_cowextsize(
 788         struct xfs_mount                *mp,
 789         uint32_t                        cowextsize,
 790         uint16_t                        mode,
 791         uint16_t                        flags,
 792         uint64_t                        flags2)
 793 {
 794         bool                            rt_flag;
 795         bool                            hint_flag;
 796         uint32_t                        cowextsize_bytes;
 797
 798         rt_flag = (flags & XFS_DIFLAG_REALTIME);
 799         hint_flag = (flags2 & XFS_DIFLAG2_COWEXTSIZE);
 800         cowextsize_bytes = XFS_FSB_TO_B(mp, cowextsize);
 801
 802         if (hint_flag && !xfs_sb_version_hasreflink(&mp->m_sb))
 803                 return __this_address;
 804
 805         if (hint_flag && !(S_ISDIR(mode) || S_ISREG(mode)))
 806                 return __this_address;
 807
 808         if (hint_flag && cowextsize == 0)
 809                 return __this_address;
 810
 811         /* free inodes get flags set to zero but cowextsize remains */
 812         if (mode && !hint_flag && cowextsize != 0)
 813                 return __this_address;
 814
 815         if (hint_flag && rt_flag)
 816                 return __this_address;
 817
 818         if (cowextsize_bytes % mp->m_sb.sb_blocksize)
 819                 return __this_address;
 820
 821         if (cowextsize > MAXEXTLEN)
 822                 return __this_address;
 823
 824         if (cowextsize > mp->m_sb.sb_agblocks / 2)
 825                 return __this_address;
 826
 827         return NULL;
 828 }