livefiles_hfs_plugin/lf_hfs_fsops_handler.c

   1 /*  Copyright © 2017-2018 Apple Inc. All rights reserved.
   2  *
   3  *  lf_hfs_fsops_handler.c
   4  *  livefiles_hfs
   5  *
   6  *  Created by Yakov Ben Zaken on 31/12/2017.
   7 */
   8
   9 #include <sys/attr.h>
  10 #include "lf_hfs.h"
  11 #include "lf_hfs_fsops_handler.h"
  12 #include "lf_hfs_dirops_handler.h"
  13 #include "lf_hfs_fileops_handler.h"
  14 #include "lf_hfs_logger.h"
  15 #include "lf_hfs_cnode.h"
  16 #include "lf_hfs_vnode.h"
  17 #include "lf_hfs_endian.h"
  18 #include "lf_hfs_vfsops.h"
  19 #include "lf_hfs_vfsutils.h"
  20 #include "lf_hfs_generic_buf.h"
  21 #include "lf_hfs_raw_read_write.h"
  22 #include "lf_hfs_journal.h"
  23 #include "lf_hfs_vfsops.h"
  24 #include "lf_hfs_mount.h"
  25 #include "lf_hfs_readwrite_ops.h"
  26
  27 #include "lf_hfs_vnops.h"
  28
  29 static int
  30 FSOPS_GetRootVnode(struct vnode* psDevVnode, struct vnode** ppsRootVnode)
  31 {
  32     return (hfs_vfs_root(psDevVnode->sFSParams.vnfs_mp, ppsRootVnode));
  33 }
  34
  35 //---------------------------------- API Implementation ------------------------------------------
  36
  37 uint64_t FSOPS_GetOffsetFromClusterNum(vnode_t vp, uint64_t uClusterNum)
  38 {
  39     return (HFSTOVCB(vp->sFSParams.vnfs_mp->psHfsmount)->hfsPlusIOPosOffset + uClusterNum * HFSTOVCB(vp->sFSParams.vnfs_mp->psHfsmount)->blockSize);
  40 }
  41
  42 int
  43 LFHFS_Taste ( int iFd )
  44 {
  45     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Taste %d\n", iFd);
  46
  47     int iError = 0;
  48     u_int32_t log_blksize;
  49     void* pvBuffer = NULL;
  50
  51     HFSMasterDirectoryBlock *psMasterBlock = hfs_malloc(kMDBSize);
  52     if ( psMasterBlock == NULL )
  53     {
  54         iError = ENOMEM;
  55         LFHFS_LOG(LEVEL_ERROR, "HFS_Taste: failed to malloc psMasterBlock\n");
  56         goto exit;
  57     }
  58
  59     /* Get the logical block size (treated as physical block size everywhere) */
  60     if (ioctl(iFd, DKIOCGETBLOCKSIZE, &log_blksize))
  61     {
  62         LFHFS_LOG(LEVEL_DEBUG, "hfs_mountfs: DKIOCGETBLOCKSIZE failed - setting to default -512\n");
  63         log_blksize = kMDBSize;
  64     }
  65
  66     if (log_blksize == 0 || log_blksize > 1024*1024*1024)
  67     {
  68         LFHFS_LOG(LEVEL_ERROR, "hfs_mountfs: logical block size 0x%x looks bad.  Not mounting.\n", log_blksize);
  69         iError = ENXIO;
  70         goto exit;
  71     }
  72
  73     if (log_blksize > kMDBSize)
  74     {
  75         pvBuffer = hfs_malloc(log_blksize);
  76         if ( pvBuffer == NULL )
  77         {
  78             iError = ENOMEM;
  79             LFHFS_LOG(LEVEL_ERROR, "HFS_Taste: failed to malloc pvBuffer\n");
  80             goto exit;
  81         }
  82     }
  83     else
  84     {
  85         pvBuffer = (void*) psMasterBlock;
  86     }
  87
  88     // Read VolumeHeader from offset 1024
  89     off_t   uVolHdrOffset  = 1024;
  90     off_t   uBlockNum      = uVolHdrOffset / log_blksize;
  91     off_t   uOffsetInBlock = uVolHdrOffset % log_blksize;
  92
  93     ssize_t iReadBytes = pread(iFd, pvBuffer, log_blksize, uBlockNum * log_blksize);
  94     if ( iReadBytes < uOffsetInBlock + kMDBSize ) {
  95         iError = (iReadBytes < 0) ? errno : EIO;
  96         LFHFS_LOG(LEVEL_ERROR, "HFS_Taste: failed to read Master Directory Block with err %d (%ld)\n", iError, iReadBytes);
  97
  98         if (log_blksize > kMDBSize) {
  99             hfs_free(pvBuffer);
 100         }
 101         goto exit;
 102     }
 103
 104     if (log_blksize > kMDBSize) {
 105         memcpy(psMasterBlock, pvBuffer + uOffsetInBlock, kMDBSize);
 106         hfs_free(pvBuffer);
 107     }
 108
 109     //Validate Signiture
 110     uint32_t drSigWord = SWAP_BE16(psMasterBlock->drSigWord);
 111     if ((drSigWord != kHFSPlusSigWord) &&
 112         (drSigWord != kHFSXSigWord))
 113     {
 114         iError = EINVAL;
 115         LFHFS_LOG(LEVEL_DEBUG, "HFS_Taste: invalid volume signature %d\n", SWAP_BE16(psMasterBlock->drSigWord));
 116         goto exit;
 117     }
 118
 119 exit:
 120     if (psMasterBlock)
 121         hfs_free(psMasterBlock);
 122     return iError;
 123 }
 124
 125 int
 126 LFHFS_ScanVols (int iFd, UVFSScanVolsRequest *psRequest, UVFSScanVolsReply *psReply )
 127 {
 128     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_ScanVols\n");
 129
 130     if ( psRequest == NULL || psReply == NULL )
 131     {
 132         return EINVAL;
 133     }
 134     else if (psRequest->sr_volid > 0)
 135     {
 136         return UVFS_SCANVOLS_EOF_REACHED;
 137     }
 138
 139     // Tell UVFS that we have a single, non-access controlled volume.
 140     psReply->sr_volid = 0;
 141     psReply->sr_volac = UAC_UNLOCKED;
 142
 143     return hfs_ScanVolGetVolName(iFd, psReply->sr_volname);
 144 }
 145
 146 int
 147 LFHFS_Init ( void )
 148 {
 149     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Init\n");
 150
 151     int iErr = 0;
 152
 153     iErr = LFHFS_LoggerInit();
 154     if ( iErr != 0 )
 155     {
 156         goto exit;
 157     }
 158
 159     iErr = raw_readwrite_zero_fill_init();
 160     if ( iErr != 0 )
 161     {
 162         goto exit;
 163     }
 164
 165     hfs_chashinit();
 166
 167     // Initializing Buffer cache
 168     lf_hfs_generic_buf_cache_init();
 169
 170     BTReserveSetup();
 171
 172     journal_init();
 173
 174 exit:
 175     return iErr;
 176 }
 177
 178 void
 179 LFHFS_Fini ( void )
 180 {
 181     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Fini\n");
 182
 183     raw_readwrite_zero_fill_de_init();
 184
 185     // De-Initializing Buffer cache
 186     lf_hfs_generic_buf_cache_deinit();
 187 }
 188
 189 int
 190 LFHFS_Mount ( int iFd, UVFSVolumeId puVolId, UVFSMountFlags puMountFlags,
 191     __unused UVFSVolumeCredential *psVolumeCreds, UVFSFileNode *ppsRootNode )
 192 {
 193     LFHFS_LOG(LEVEL_DEBUG, "HFS_Mount %d\n", iFd);
 194     int iError = 0;
 195
 196     struct mount* psMount            = hfs_mallocz(sizeof(struct mount));
 197     struct vnode* psDevVnode         = hfs_mallocz(sizeof(struct vnode));
 198     struct cnode* psDevCnode         = hfs_mallocz(sizeof(struct cnode));
 199     struct filefork* psDevFileFork   = hfs_mallocz(sizeof(struct filefork));
 200     FileSystemRecord_s *psFSRecord   = hfs_mallocz(sizeof(FileSystemRecord_s));
 201
 202     if ( psMount == NULL || psDevVnode == NULL || psDevCnode == NULL || psDevFileFork == NULL || psFSRecord == NULL )
 203     {
 204         iError = ENOMEM;
 205         LFHFS_LOG(LEVEL_ERROR, "HFS_Mount: failed to malloc initial system files\n");
 206         goto fail;
 207     }
 208
 209     if (puVolId != 0)
 210     {
 211         iError = EINVAL;
 212         LFHFS_LOG(LEVEL_ERROR, "HFS_Mount: unknown volume ID\n");
 213         goto fail;
 214     }
 215
 216     psFSRecord->iFD             = iFd;
 217     psDevVnode->psFSRecord      = psFSRecord;
 218     psDevVnode->sFSParams.vnfs_marksystem = 1;
 219     psDevVnode->bIsMountVnode   = true;
 220
 221     // Initializing inputs for hfs_mount
 222     psDevFileFork->ff_data.cf_blocks                = 3;
 223     psDevFileFork->ff_data.cf_extents[0].blockCount = 1;
 224     psDevFileFork->ff_data.cf_extents[0].startBlock = 0;
 225
 226     psDevVnode->sFSParams.vnfs_fsnode   = psDevCnode;
 227     psDevCnode->c_vp                    = psDevVnode;
 228     psDevVnode->is_rsrc                 = false;
 229     psDevCnode->c_datafork              = psDevFileFork;
 230     psDevVnode->sFSParams.vnfs_mp       = psMount;
 231
 232     psMount->mnt_flag = (puMountFlags == UVFS_MOUNT_RDONLY)? MNT_RDONLY : 0;
 233     // Calling to kext hfs_mount
 234     iError = hfs_mount(psMount, psDevVnode, 0);
 235     if (iError)
 236         goto fail;
 237
 238     struct vnode* psRootVnode;
 239     // Creating root vnode
 240     iError = FSOPS_GetRootVnode(psDevVnode,&psRootVnode);
 241     if (iError)
 242         goto fail;
 243     *ppsRootNode = (UVFSFileNode) psRootVnode;
 244
 245     goto end;
 246
 247 fail:
 248     if (psFSRecord)
 249         hfs_free(psFSRecord);
 250     if (psMount)
 251         hfs_free(psMount);
 252     if (psDevVnode)
 253         hfs_free(psDevVnode);
 254     if (psDevCnode)
 255         hfs_free(psDevCnode);
 256     if (psDevFileFork)
 257         hfs_free(psDevFileFork);
 258 end:
 259     return iError;
 260 }
 261
 262 int
 263 LFHFS_Unmount ( UVFSFileNode psRootNode, UVFSUnmountHint hint )
 264 {
 265     VERIFY_NODE_IS_VALID(psRootNode);
 266     LFHFS_LOG(LEVEL_DEBUG, "HFS_Unmount (psRootNode %p) (hint %u)\n", psRootNode, hint);
 267
 268     int iError = 0;
 269     struct vnode       *psRootVnode = (struct vnode*) psRootNode;
 270     FileSystemRecord_s *psFSRecord  = VPTOFSRECORD(psRootVnode);
 271     struct mount       *psMount     = psRootVnode->sFSParams.vnfs_mp;
 272     struct cnode       *psDevCnode  = VTOHFS(psRootVnode)->hfs_devvp->sFSParams.vnfs_fsnode;
 273     struct hfsmount    *psHfsMp     = psMount->psHfsmount;
 274     psFSRecord->uUnmountHint        = hint;
 275
 276     #if HFS_CRASH_TEST
 277         CRASH_ABORT(CRASH_ABORT_ON_UNMOUNT, psHfsMp, NULL);
 278     #endif
 279
 280     hfs_vnop_reclaim(psRootVnode);
 281
 282     if (!psHfsMp->jnl) {
 283         hfs_flushvolumeheader(psHfsMp, HFS_FVH_SKIP_TRANSACTION | HFS_FVH_MARK_UNMOUNT);
 284     }
 285
 286     hfs_unmount(psMount);
 287
 288     hfs_free(psFSRecord);
 289     hfs_free(psMount);
 290     hfs_free(psDevCnode->c_datafork);
 291     hfs_free(psDevCnode);
 292
 293     return iError;
 294 }
 295
 296 int
 297 LFHFS_SetFSAttr ( UVFSFileNode psNode, const char *pcAttr, const UVFSFSAttributeValue *psAttrVal, size_t uLen, UVFSFSAttributeValue *psOutAttrVal, size_t uOutLen )
 298 {
 299 #pragma unused (psNode, pcAttr, psAttrVal, uLen)
 300     VERIFY_NODE_IS_VALID(psNode);
 301
 302     if (pcAttr == NULL || psAttrVal == NULL || psOutAttrVal == NULL) return EINVAL;
 303
 304     if (strcmp(pcAttr, LI_FSATTR_PREALLOCATE) == 0)
 305     {
 306          if (uLen < sizeof (UVFSFSAttributeValue) || uOutLen < sizeof (UVFSFSAttributeValue))
 307              return EINVAL;
 308
 309          LIFilePreallocateArgs_t* psPreAllocReq = (LIFilePreallocateArgs_t *) ((void *) psAttrVal->fsa_opaque);
 310          LIFilePreallocateArgs_t* psPreAllocRes = (LIFilePreallocateArgs_t *) ((void *) psOutAttrVal->fsa_opaque);
 311
 312          memcpy (psPreAllocRes, psPreAllocReq, sizeof(LIFilePreallocateArgs_t));
 313          return hfs_vnop_preallocate(psNode, psPreAllocReq, psPreAllocRes);
 314     }
 315
 316     return ENOTSUP;
 317 }
 318
 319 int
 320 LFHFS_GetFSAttr ( UVFSFileNode psNode, const char *pcAttr, UVFSFSAttributeValue *psAttrVal, size_t uLen, size_t *puRetLen )
 321 {
 322     VERIFY_NODE_IS_VALID(psNode);
 323     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_GetFSAttr (psNode %p)\n", psNode);
 324
 325     int iError = 0;
 326     vnode_t psVnode = (vnode_t)psNode;
 327     struct hfsmount *psMount = psVnode->sFSParams.vnfs_mp->psHfsmount;
 328
 329     if (strcmp(pcAttr, UVFS_FSATTR_PC_LINK_MAX)==0)
 330     {
 331         *puRetLen = sizeof(uint64_t);
 332         if (uLen < *puRetLen)
 333         {
 334             return E2BIG;
 335         }
 336
 337         if ( vnode_isreg(psVnode) )
 338         {
 339             psAttrVal->fsa_number = HFS_LINK_MAX;
 340         }
 341         else
 342         {
 343             psAttrVal->fsa_number = 1;
 344         }
 345         goto end;
 346     }
 347
 348     if (strcmp(pcAttr, UVFS_FSATTR_PC_NAME_MAX)==0)
 349     {
 350         *puRetLen = sizeof(uint64_t);
 351         if (uLen < *puRetLen)
 352         {
 353             return E2BIG;
 354         }
 355         psAttrVal->fsa_number = MAXPATHLEN;
 356         goto end;
 357     }
 358
 359     if (strcmp(pcAttr, UVFS_FSATTR_PC_NO_TRUNC)==0)
 360     {
 361         *puRetLen = sizeof(bool);
 362         if (uLen < *puRetLen)
 363         {
 364             return E2BIG;
 365         }
 366         psAttrVal->fsa_bool = true;
 367         goto end;
 368     }
 369
 370     if (strcmp(pcAttr, UVFS_FSATTR_PC_FILESIZEBITS)==0)
 371     {
 372         // The number of bits used to represent the size (in bytes) of a file
 373         *puRetLen = sizeof(uint64_t);
 374         if (uLen < *puRetLen)
 375         {
 376             return E2BIG;
 377         }
 378         psAttrVal->fsa_number = 64;
 379         goto end;
 380     }
 381
 382     if (strcmp(pcAttr, UVFS_FSATTR_PC_XATTR_SIZE_BITS)==0)
 383     {
 384         // The number of bits used to represent the size (in bytes) of an extended attribute.
 385         *puRetLen = sizeof(uint64_t);
 386         if (uLen < *puRetLen)
 387         {
 388             return E2BIG;
 389         }
 390         psAttrVal->fsa_number = HFS_XATTR_SIZE_BITS;
 391         goto end;
 392     }
 393
 394     if (strcmp(pcAttr, UVFS_FSATTR_BLOCKSIZE)==0)
 395     {
 396         *puRetLen = sizeof(uint64_t);
 397         if (uLen < *puRetLen)
 398         {
 399             return E2BIG;
 400         }
 401         psAttrVal->fsa_number = psMount->blockSize;
 402         goto end;
 403     }
 404
 405     if (strcmp(pcAttr, UVFS_FSATTR_IOSIZE)==0)
 406     {
 407         // Size (in bytes) of the optimal transfer block size
 408         *puRetLen = sizeof(uint64_t);
 409         if (uLen < *puRetLen)
 410         {
 411             return E2BIG;
 412         }
 413         psAttrVal->fsa_number = 1024*1024*128;
 414         goto end;
 415     }
 416
 417     if (strcmp(pcAttr, UVFS_FSATTR_TOTALBLOCKS)==0)
 418     {
 419         // Total number of file system blocks
 420         *puRetLen = sizeof(uint64_t);
 421         if (uLen < *puRetLen)
 422         {
 423             return E2BIG;
 424         }
 425         psAttrVal->fsa_number = psMount->totalBlocks;
 426         goto end;
 427     }
 428
 429     if (strcmp(pcAttr, UVFS_FSATTR_BLOCKSFREE)==0)
 430     {
 431         // Total number of free file system blocks
 432         *puRetLen = sizeof(uint64_t);
 433         if (uLen < *puRetLen)
 434         {
 435             return E2BIG;
 436         }
 437         psAttrVal->fsa_number = hfs_freeblks( psMount, 0 );
 438         goto end;
 439     }
 440
 441     if (strcmp(pcAttr, UVFS_FSATTR_BLOCKSAVAIL)==0)
 442     {
 443         // Total number of free file system blocks available for allocation to files (in our case - the same as UVFS_FSATTR_BLOCKSFREE)
 444         *puRetLen = sizeof(uint64_t);
 445         if (uLen < *puRetLen)
 446         {
 447             return E2BIG;
 448         }
 449         psAttrVal->fsa_number = hfs_freeblks( psMount, 1 );
 450         goto end;
 451     }
 452
 453     if (strcmp(pcAttr, UVFS_FSATTR_BLOCKSUSED)==0)
 454     {
 455         // Number of file system blocks currently allocated for some use (TOTAL_BLOCKS - BLOCKSAVAIL)
 456         *puRetLen = sizeof(uint64_t);
 457         if (uLen < *puRetLen)
 458         {
 459             return E2BIG;
 460         }
 461         psAttrVal->fsa_number = psMount->totalBlocks - hfs_freeblks( psMount, 1 );
 462         goto end;
 463     }
 464
 465     if (strcmp(pcAttr, UVFS_FSATTR_CNAME)==0)
 466     {
 467         char* pcName;
 468         //The file name
 469         if (IS_ROOT(psVnode))
 470             pcName = "";
 471         else
 472             pcName = (char*) psVnode->sFSParams.vnfs_cnp->cn_nameptr;
 473
 474         if (pcName ==  NULL)
 475             return EINVAL;
 476
 477         *puRetLen = strlen(pcName) + 1;
 478         if (uLen < *puRetLen)
 479         {
 480             return E2BIG;
 481         }
 482         strlcpy(psAttrVal->fsa_string, pcName, *puRetLen);
 483         return 0;
 484     }
 485
 486     if (strcmp(pcAttr, UVFS_FSATTR_FSTYPENAME)==0)
 487     {
 488         *puRetLen = 4;
 489         if (uLen < *puRetLen)
 490         {
 491             return E2BIG;
 492         }
 493         // A string representing the type of file system
 494         strcpy(psAttrVal->fsa_string, "HFS");
 495         *(psAttrVal->fsa_string+3) = 0; // Must be null terminated
 496         goto end;
 497     }
 498
 499     if (strcmp(pcAttr, UVFS_FSATTR_FSSUBTYPE)==0)
 500     {
 501 #define HFS_PLUS_STR                            "HFS Plus"
 502 #define HFS_PLUS_JOURNALED_STR                  "HFS Plus (Journaled)"
 503 #define HFS_PLUS_CASE_SENS_STR                  "HFS Plus (Case Sensitive)"
 504 #define HFS_PLUS_CASE_SENS_JOURNALED_STR        "HFS Plus (Case Sensitive, Journaled)"
 505
 506         char* pcFSSubType = HFS_PLUS_STR;
 507         if ( (psMount->hfs_flags & HFS_CASE_SENSITIVE) && psMount->jnl )
 508         {
 509             pcFSSubType = HFS_PLUS_CASE_SENS_JOURNALED_STR;
 510         }
 511         else if ( psMount->hfs_flags & HFS_CASE_SENSITIVE )
 512         {
 513             pcFSSubType = HFS_PLUS_CASE_SENS_STR;
 514         }
 515         else if ( psMount->jnl )
 516         {
 517             pcFSSubType = HFS_PLUS_JOURNALED_STR;
 518         }
 519
 520         *puRetLen = strlen( pcFSSubType ) + 1;
 521         if ( uLen < *puRetLen )
 522         {
 523             return E2BIG;
 524         }
 525
 526         strcpy( psAttrVal->fsa_string, pcFSSubType );
 527         goto end;
 528     }
 529
 530     if (strcmp(pcAttr, UVFS_FSATTR_VOLNAME)==0)
 531     {
 532         *puRetLen = strlen((char *)psMount->vcbVN)+1; // Add 1 for the NULL terminator
 533         if (uLen < *puRetLen)
 534         {
 535             return E2BIG;
 536         }
 537         strcpy(psAttrVal->fsa_string, (char *)psMount->vcbVN);
 538         goto end;
 539     }
 540
 541     if (strcmp(pcAttr, UVFS_FSATTR_VOLUUID)==0)
 542     {
 543         *puRetLen = sizeof(uuid_t);
 544         if (uLen < *puRetLen)
 545         {
 546             return E2BIG;
 547         }
 548         hfs_getvoluuid( psMount, psAttrVal->fsa_opaque );
 549         goto end;
 550     }
 551
 552     if (strcmp(pcAttr, UVFS_FSATTR_CAPS_FORMAT)==0)
 553     {
 554         // A bitmask indicating the capabilities of the volume format
 555         *puRetLen = sizeof(uint64_t);
 556         if (uLen < *puRetLen)
 557         {
 558             return E2BIG;
 559         }
 560
 561         psAttrVal->fsa_number =
 562             VOL_CAP_FMT_PERSISTENTOBJECTIDS     |
 563             VOL_CAP_FMT_SYMBOLICLINKS           |
 564             VOL_CAP_FMT_HARDLINKS               |
 565             VOL_CAP_FMT_JOURNAL                 |
 566             (psMount->jnl ? VOL_CAP_FMT_JOURNAL_ACTIVE : 0)                             |
 567             (psMount->hfs_flags & HFS_CASE_SENSITIVE ? VOL_CAP_FMT_CASE_SENSITIVE : 0)  |
 568             VOL_CAP_FMT_CASE_PRESERVING         |
 569             VOL_CAP_FMT_2TB_FILESIZE            |
 570             VOL_CAP_FMT_HIDDEN_FILES            |
 571             /* XXX rdar://problem/48128963 VOL_CAP_FMT_PATH_FROM_ID */ 0;
 572
 573         goto end;
 574     }
 575
 576     if (strcmp(pcAttr, UVFS_FSATTR_CAPS_INTERFACES)==0)
 577     {
 578         // A bitmask indicating the interface capabilities of the file system
 579         *puRetLen = sizeof(uint64_t);
 580         if (uLen < *puRetLen)
 581         {
 582             return E2BIG;
 583         }
 584
 585         psAttrVal->fsa_number =
 586 #if LF_HFS_NATIVE_SEARCHFS_SUPPORT
 587             VOL_CAP_INT_SEARCHFS |
 588 #endif
 589             VOL_CAP_INT_EXTENDED_ATTR;
 590
 591         goto end;
 592     }
 593
 594     if (strcmp(pcAttr, UVFS_FSATTR_LAST_MTIME)==0)
 595     {
 596         // system lsat mounted time
 597         *puRetLen = sizeof(uint64_t);
 598         if (uLen < *puRetLen)
 599         {
 600             return E2BIG;
 601         }
 602         psAttrVal->fsa_number = psMount->hfs_last_mounted_mtime;
 603         goto end;
 604     }
 605
 606     if (strcmp(pcAttr, UVFS_FSATTR_MOUNT_TIME)==0)
 607     {
 608         // system mount time
 609         *puRetLen = sizeof(uint64_t);
 610         if (uLen < *puRetLen)
 611         {
 612             return E2BIG;
 613         }
 614         psAttrVal->fsa_number = psMount->hfs_mount_time;
 615         goto end;
 616     }
 617
 618     iError = ENOTSUP;
 619 end:
 620     return iError;
 621 }
 622
 623 // kHFSVolumeUnmountedMask: this bit is used to indicate whether the volume is dirty (for which fsck needs to run prior to mount) or clean.
 624 // For non-journaled volumes:
 625 // - Each operation that causes metadata modification clears this bit.
 626 // - A Sync operation that takes place after all 'dirtying' operations are completed sets this bit.
 627 // Syncronization between the 'dirtying' operations and the Sync is performed by the hfs_global_lock().
 628 // For journaled volumes, the volume is considered clean after a journal has been committed to the media.
 629 int LFHFS_Sync(UVFSFileNode psNode) {
 630     VERIFY_NODE_IS_VALID(psNode);
 631     LFHFS_LOG(LEVEL_DEBUG, "LFHFS_Sync (psNode %p)\n", psNode);
 632
 633     int iErr = 0;
 634     vnode_t psVnode = (vnode_t)psNode;
 635     struct hfsmount *psMount = psVnode->sFSParams.vnfs_mp->psHfsmount;
 636     bool bNeedUnlock = false;
 637
 638     lf_lck_mtx_lock(&psMount->sync_mutex);
 639     psMount->hfs_syncer_thread = pthread_self();
 640
 641     if (psMount->jnl) {
 642
 643         hfs_flush(psMount, HFS_FLUSH_JOURNAL_META);
 644
 645     } else {
 646
 647         if (psMount->hfs_global_lockowner != pthread_self()) {
 648             hfs_lock_global(psMount, HFS_EXCLUSIVE_LOCK);
 649             bNeedUnlock = true;
 650         }
 651
 652         hfs_flushvolumeheader(psMount, HFS_FVH_SKIP_TRANSACTION | HFS_FVH_MARK_UNMOUNT);
 653
 654         if (bNeedUnlock) {
 655             hfs_unlock_global(psMount);
 656         }
 657     }
 658
 659     psMount->hfs_syncer_thread = NULL;
 660     lf_lck_mtx_unlock(&psMount->sync_mutex);
 661
 662     return(iErr);
 663 }
 664
 665 int
 666 LFHFS_Check( int fdToCheck , __unused UVFSVolumeId volId,
 667     __unused UVFSVolumeCredential *volumeCreds, check_flags_t how )
 668 {
 669     return fsck_hfs(fdToCheck, how);
 670 }
 671
 672 UVFSFSOps HFS_fsOps = {
 673     .fsops_version      = UVFS_FSOPS_VERSION_CURRENT,
 674
 675     .fsops_init         = LFHFS_Init,
 676     .fsops_fini         = LFHFS_Fini,
 677
 678     .fsops_taste        = LFHFS_Taste,
 679     .fsops_scanvols     = LFHFS_ScanVols,
 680     .fsops_mount        = LFHFS_Mount,
 681     .fsops_sync         = LFHFS_Sync,
 682     .fsops_unmount      = LFHFS_Unmount,
 683
 684     .fsops_getfsattr    = LFHFS_GetFSAttr,
 685     .fsops_setfsattr    = LFHFS_SetFSAttr,
 686
 687     .fsops_getattr      = LFHFS_GetAttr,
 688     .fsops_setattr      = LFHFS_SetAttr,
 689     .fsops_lookup       = LFHFS_Lookup,
 690     .fsops_reclaim      = LFHFS_Reclaim,
 691     .fsops_readlink     = LFHFS_ReadLink,
 692     .fsops_read         = LFHFS_Read,
 693     .fsops_write        = LFHFS_Write,
 694     .fsops_create       = LFHFS_Create,
 695     .fsops_mkdir        = LFHFS_MkDir,
 696     .fsops_symlink      = LFHFS_SymLink,
 697     .fsops_remove       = LFHFS_Remove,
 698     .fsops_rmdir        = LFHFS_RmDir,
 699     .fsops_rename       = LFHFS_Rename,
 700     .fsops_readdir      = LFHFS_ReadDir,
 701     .fsops_readdirattr  = LFHFS_ReadDirAttr,
 702     .fsops_link         = LFHFS_Link,
 703     .fsops_check        = LFHFS_Check,
 704
 705     .fsops_getxattr     = LFHFS_GetXAttr,
 706     .fsops_setxattr     = LFHFS_SetXAttr,
 707     .fsops_listxattr    = LFHFS_ListXAttr,
 708
 709     .fsops_scandir      = LFHFS_ScanDir,
 710     .fsops_scanids      = LFHFS_ScanIDs,
 711
 712     .fsops_stream_lookup = LFHFS_StreamLookup,
 713     .fsops_stream_reclaim = LFHFS_StreamReclaim,
 714     .fsops_stream_read = LFHFS_StreamRead,
 715 };
 716
 717 #if HFS_CRASH_TEST
 718 CrashAbortFunction_FP gpsCrashAbortFunctionArray[CRASH_ABORT_LAST] = {0};
 719 #endif
 720
 721 __attribute__((visibility("default")))
 722 void
 723 livefiles_plugin_init(UVFSFSOps **ops)
 724 {
 725     if (ops) {
 726         *ops = &HFS_fsOps;
 727     }
 728
 729     return;
 730 }