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[EXT2] Correctly zero memory before using it
[reactos.git] / drivers / filesystems / ext2 / src / memory.c
1 /*
2 * COPYRIGHT: See COPYRIGHT.TXT
3 * PROJECT: Ext2 File System Driver for WinNT/2K/XP
4 * FILE: memory.c
5 * PROGRAMMER: Matt Wu <mattwu@163.com>
6 * HOMEPAGE: http://www.ext2fsd.com
7 * UPDATE HISTORY:
8 */
9
10 /* INCLUDES *****************************************************************/
11
12 #include "ext2fs.h"
13
14 /* GLOBALS ***************************************************************/
15
16 extern PEXT2_GLOBAL Ext2Global;
17
18 /* DEFINITIONS *************************************************************/
19
20 #ifdef ALLOC_PRAGMA
21 #pragma alloc_text(PAGE, Ext2AllocateInode)
22 #pragma alloc_text(PAGE, Ext2DestroyInode)
23 #pragma alloc_text(PAGE, Ext2CheckBitmapConsistency)
24 #pragma alloc_text(PAGE, Ext2CheckSetBlock)
25 #pragma alloc_text(PAGE, Ext2InitializeVcb)
26 #pragma alloc_text(PAGE, Ext2TearDownStream)
27 #pragma alloc_text(PAGE, Ext2DestroyVcb)
28 #pragma alloc_text(PAGE, Ext2SyncUninitializeCacheMap)
29 #pragma alloc_text(PAGE, Ext2ReaperThread)
30 #pragma alloc_text(PAGE, Ext2StartReaper)
31 #pragma alloc_text(PAGE, Ext2StopReaper)
32 #endif
33
34 PEXT2_IRP_CONTEXT
35 Ext2AllocateIrpContext (IN PDEVICE_OBJECT DeviceObject,
36 IN PIRP Irp )
37 {
38 PIO_STACK_LOCATION irpSp;
39 PEXT2_IRP_CONTEXT IrpContext;
40
41 ASSERT(DeviceObject != NULL);
42 ASSERT(Irp != NULL);
43
44 irpSp = IoGetCurrentIrpStackLocation(Irp);
45
46 IrpContext = (PEXT2_IRP_CONTEXT) (
47 ExAllocateFromNPagedLookasideList(
48 &(Ext2Global->Ext2IrpContextLookasideList)));
49
50 if (IrpContext == NULL) {
51 return NULL;
52 }
53
54 RtlZeroMemory(IrpContext, sizeof(EXT2_IRP_CONTEXT) );
55
56 IrpContext->Identifier.Type = EXT2ICX;
57 IrpContext->Identifier.Size = sizeof(EXT2_IRP_CONTEXT);
58
59 IrpContext->Irp = Irp;
60 IrpContext->MajorFunction = irpSp->MajorFunction;
61 IrpContext->MinorFunction = irpSp->MinorFunction;
62 IrpContext->DeviceObject = DeviceObject;
63 IrpContext->FileObject = irpSp->FileObject;
64 if (NULL != IrpContext->FileObject) {
65 IrpContext->Fcb = (PEXT2_FCB)IrpContext->FileObject->FsContext;
66 IrpContext->Ccb = (PEXT2_CCB)IrpContext->FileObject->FsContext2;
67 }
68
69 if (IrpContext->FileObject != NULL) {
70 IrpContext->RealDevice = IrpContext->FileObject->DeviceObject;
71 } else if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL) {
72 if (irpSp->Parameters.MountVolume.Vpb) {
73 IrpContext->RealDevice = irpSp->Parameters.MountVolume.Vpb->RealDevice;
74 }
75 }
76
77 if (IsFlagOn(irpSp->Flags, SL_WRITE_THROUGH)) {
78 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WRITE_THROUGH);
79 }
80
81 if (IsFlagOn(irpSp->Flags, SL_OVERRIDE_VERIFY_VOLUME)) {
82 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_VERIFY_READ);
83 }
84
85 if (IrpContext->MajorFunction == IRP_MJ_CLEANUP ||
86 IrpContext->MajorFunction == IRP_MJ_CLOSE ||
87 IrpContext->MajorFunction == IRP_MJ_SHUTDOWN ||
88 IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL ||
89 IrpContext->MajorFunction == IRP_MJ_PNP ) {
90
91 if (IrpContext->MajorFunction == IRP_MJ_FILE_SYSTEM_CONTROL ||
92 IrpContext->MajorFunction == IRP_MJ_PNP) {
93 if (IoGetCurrentIrpStackLocation(Irp)->FileObject == NULL ||
94 IoIsOperationSynchronous(Irp)) {
95 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
96 }
97 } else {
98 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
99 }
100
101 } else if (IoIsOperationSynchronous(Irp)) {
102
103 SetFlag(IrpContext->Flags, IRP_CONTEXT_FLAG_WAIT);
104 }
105
106 IrpContext->IsTopLevel = (IoGetTopLevelIrp() == Irp);
107 IrpContext->ExceptionInProgress = FALSE;
108 INC_IRP_COUNT(IrpContext);
109
110 return IrpContext;
111 }
112
113 VOID
114 Ext2FreeIrpContext (IN PEXT2_IRP_CONTEXT IrpContext)
115 {
116 ASSERT(IrpContext != NULL);
117
118 ASSERT((IrpContext->Identifier.Type == EXT2ICX) &&
119 (IrpContext->Identifier.Size == sizeof(EXT2_IRP_CONTEXT)));
120
121 /* free the IrpContext to NonPagedList */
122 IrpContext->Identifier.Type = 0;
123 IrpContext->Identifier.Size = 0;
124
125 DEC_IRP_COUNT(IrpContext);
126 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2IrpContextLookasideList), IrpContext);
127 }
128
129
130 PEXT2_FCB
131 Ext2AllocateFcb (
132 IN PEXT2_VCB Vcb,
133 IN PEXT2_MCB Mcb
134 )
135 {
136 PEXT2_FCB Fcb;
137
138 ASSERT(ExIsResourceAcquiredExclusiveLite(&Vcb->FcbLock));
139
140 Fcb = (PEXT2_FCB) ExAllocateFromNPagedLookasideList(
141 &(Ext2Global->Ext2FcbLookasideList));
142
143 if (!Fcb) {
144 return NULL;
145 }
146
147 RtlZeroMemory(Fcb, sizeof(EXT2_FCB));
148 Fcb->Identifier.Type = EXT2FCB;
149 Fcb->Identifier.Size = sizeof(EXT2_FCB);
150
151 #ifndef _WIN2K_TARGET_
152 ExInitializeFastMutex(&Fcb->Mutex);
153 FsRtlSetupAdvancedHeader(&Fcb->Header, &Fcb->Mutex);
154 #endif
155
156 FsRtlInitializeOplock(&Fcb->Oplock);
157 FsRtlInitializeFileLock (
158 &Fcb->FileLockAnchor,
159 NULL,
160 NULL );
161
162 Fcb->OpenHandleCount = 0;
163 Fcb->ReferenceCount = 0;
164 Fcb->Vcb = Vcb;
165 Fcb->Inode = &Mcb->Inode;
166
167 ASSERT(Mcb->Fcb == NULL);
168 Ext2ReferMcb(Mcb);
169 Fcb->Mcb = Mcb;
170 Mcb->Fcb = Fcb;
171
172 DEBUG(DL_RES, ("Ext2AllocateFcb: Fcb %p created: %wZ.\n",
173 Fcb, &Fcb->Mcb->FullName));
174
175 RtlZeroMemory(&Fcb->Header, sizeof(FSRTL_COMMON_FCB_HEADER));
176 Fcb->Header.NodeTypeCode = (USHORT) EXT2FCB;
177 Fcb->Header.NodeByteSize = sizeof(EXT2_FCB);
178 Fcb->Header.IsFastIoPossible = FastIoIsNotPossible;
179 Fcb->Header.Resource = &(Fcb->MainResource);
180 Fcb->Header.PagingIoResource = &(Fcb->PagingIoResource);
181
182 Fcb->Header.FileSize.QuadPart = Mcb->Inode.i_size;
183 Fcb->Header.ValidDataLength.QuadPart = Mcb->Inode.i_size;
184 Fcb->Header.AllocationSize.QuadPart = CEILING_ALIGNED(ULONGLONG,
185 Fcb->Header.FileSize.QuadPart, (ULONGLONG)Vcb->BlockSize);
186
187 Fcb->SectionObject.DataSectionObject = NULL;
188 Fcb->SectionObject.SharedCacheMap = NULL;
189 Fcb->SectionObject.ImageSectionObject = NULL;
190
191 ExInitializeResourceLite(&(Fcb->MainResource));
192 ExInitializeResourceLite(&(Fcb->PagingIoResource));
193
194 Ext2InsertFcb(Vcb, Fcb);
195
196 INC_MEM_COUNT(PS_FCB, Fcb, sizeof(EXT2_FCB));
197
198 return Fcb;
199 }
200
201 VOID
202 Ext2UnlinkFcb(IN PEXT2_FCB Fcb)
203 {
204 PEXT2_VCB Vcb = Fcb->Vcb;
205 PEXT2_MCB Mcb;
206
207 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE);
208 Mcb = Fcb->Mcb;
209
210 DEBUG(DL_INF, ("Ext2FreeFcb: Fcb (%p) to be unlinked: %wZ.\n",
211 Fcb, Mcb ? &Mcb->FullName : NULL));
212
213 if ((Mcb != NULL) &&
214 (Mcb->Identifier.Type == EXT2MCB) &&
215 (Mcb->Identifier.Size == sizeof(EXT2_MCB))) {
216
217 ASSERT (Mcb->Fcb == Fcb);
218 if (IsMcbSpecialFile(Mcb) ||
219 IsFileDeleted(Mcb)) {
220
221 ASSERT(!IsRoot(Fcb));
222 Ext2RemoveMcb(Vcb, Mcb);
223 Mcb->Fcb = NULL;
224
225 Ext2UnlinkMcb(Vcb, Mcb);
226 Ext2DerefMcb(Mcb);
227 Ext2LinkHeadMcb(Vcb, Mcb);
228
229 } else {
230 Mcb->Fcb = NULL;
231 Ext2DerefMcb(Mcb);
232 }
233 Fcb->Mcb = NULL;
234 }
235
236 ExReleaseResourceLite(&Vcb->McbLock);
237 }
238
239 VOID
240 Ext2FreeFcb (IN PEXT2_FCB Fcb)
241 {
242 PEXT2_VCB Vcb = Fcb->Vcb;
243
244 _SEH2_TRY {
245
246 ASSERT((Fcb != NULL) && (Fcb->Identifier.Type == EXT2FCB) &&
247 (Fcb->Identifier.Size == sizeof(EXT2_FCB)));
248 ASSERT(0 == Fcb->ReferenceCount);
249
250 #ifndef _WIN2K_TARGET_
251 FsRtlTeardownPerStreamContexts(&Fcb->Header);
252 #endif
253
254 FsRtlUninitializeFileLock(&Fcb->FileLockAnchor);
255 FsRtlUninitializeOplock(&Fcb->Oplock);
256 ExDeleteResourceLite(&Fcb->MainResource);
257 ExDeleteResourceLite(&Fcb->PagingIoResource);
258
259 Fcb->Identifier.Type = 0;
260 Fcb->Identifier.Size = 0;
261
262 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2FcbLookasideList), Fcb);
263 DEC_MEM_COUNT(PS_FCB, Fcb, sizeof(EXT2_FCB));
264
265 if (0 == Ext2DerefXcb(&Vcb->ReferenceCount)) {
266 if (!IsMounted(Vcb) || IsDispending(Vcb)) {
267 Ext2CheckDismount(NULL, Vcb, FALSE);
268 }
269 }
270
271 } _SEH2_FINALLY {
272 } _SEH2_END;
273 }
274
275 VOID
276 Ext2ReleaseFcb (IN PEXT2_FCB Fcb)
277 {
278 PEXT2_VCB Vcb = Fcb->Vcb;
279 PEXT2_MCB Mcb;
280
281 if (0 != Ext2DerefXcb(&Fcb->ReferenceCount))
282 return;
283
284 ExAcquireResourceExclusiveLite(&Vcb->FcbLock, TRUE);
285 ExAcquireResourceExclusiveLite(&Fcb->MainResource, TRUE);
286
287 Mcb = Fcb->Mcb;
288 RemoveEntryList(&Fcb->Next);
289
290 if (IsFlagOn(Fcb->Flags, FCB_DELETE_PENDING) ||
291 NULL == Mcb || IsFileDeleted(Mcb)) {
292 InsertHeadList(&Vcb->FcbList, &Fcb->Next);
293 Fcb->TsDrop.QuadPart = 0;
294 } else {
295 InsertTailList(&Vcb->FcbList, &Fcb->Next);
296 KeQuerySystemTime(&Fcb->TsDrop);
297 }
298 ExReleaseResourceLite(&Fcb->MainResource);
299 ExReleaseResourceLite(&Vcb->FcbLock);
300
301 if ((Vcb->FcbCount >> 6) > (ULONG)(Ext2Global->MaxDepth)) {
302 KeSetEvent(&Ext2Global->FcbReaper.Wait, 0, FALSE);
303 }
304 }
305
306 /* Insert Fcb to Vcb->FcbList queue, with Vcb->FcbLock Acquired. */
307
308 VOID
309 Ext2InsertFcb(PEXT2_VCB Vcb, PEXT2_FCB Fcb)
310 {
311 ASSERT(ExIsResourceAcquiredExclusiveLite(&Vcb->FcbLock));
312
313 KeQuerySystemTime(&Fcb->TsDrop);
314 Ext2ReferXcb(&Vcb->FcbCount);
315 Ext2ReferXcb(&Vcb->ReferenceCount);
316 InsertTailList(&Vcb->FcbList, &Fcb->Next);
317 }
318
319 PEXT2_CCB
320 Ext2AllocateCcb (ULONG Flags, PEXT2_MCB SymLink)
321 {
322 PEXT2_CCB Ccb;
323
324 Ccb = (PEXT2_CCB) (ExAllocateFromNPagedLookasideList(
325 &(Ext2Global->Ext2CcbLookasideList)));
326 if (!Ccb) {
327 return NULL;
328 }
329
330 DEBUG(DL_RES, ( "ExtAllocateCcb: Ccb created: %ph.\n", Ccb));
331
332 RtlZeroMemory(Ccb, sizeof(EXT2_CCB));
333
334 Ccb->Identifier.Type = EXT2CCB;
335 Ccb->Identifier.Size = sizeof(EXT2_CCB);
336 Ccb->Flags = Flags;
337
338 Ccb->SymLink = SymLink;
339 if (SymLink) {
340 ASSERT(SymLink->Refercount > 0);
341 Ext2ReferMcb(SymLink);
342 DEBUG(DL_INF, ( "ExtAllocateCcb: Ccb SymLink: %wZ.\n",
343 &Ccb->SymLink->FullName));
344 }
345
346 Ccb->DirectorySearchPattern.Length = 0;
347 Ccb->DirectorySearchPattern.MaximumLength = 0;
348 Ccb->DirectorySearchPattern.Buffer = 0;
349
350 INC_MEM_COUNT(PS_CCB, Ccb, sizeof(EXT2_CCB));
351
352 return Ccb;
353 }
354
355 VOID
356 Ext2FreeCcb (IN PEXT2_VCB Vcb, IN PEXT2_CCB Ccb)
357 {
358 ASSERT(Ccb != NULL);
359 ASSERT((Ccb->Identifier.Type == EXT2CCB) &&
360 (Ccb->Identifier.Size == sizeof(EXT2_CCB)));
361
362 DEBUG(DL_RES, ( "Ext2FreeCcb: Ccb = %ph.\n", Ccb));
363
364 if (Ccb->SymLink) {
365 DEBUG(DL_INF, ( "Ext2FreeCcb: Ccb SymLink: %wZ.\n",
366 &Ccb->SymLink->FullName));
367 if (IsFileDeleted(Ccb->SymLink->Target)) {
368 Ext2UnlinkMcb(Vcb, Ccb->SymLink);
369 Ext2DerefMcb(Ccb->SymLink);
370 Ext2LinkHeadMcb(Vcb, Ccb->SymLink);
371 } else {
372 Ext2DerefMcb(Ccb->SymLink);
373 }
374 }
375
376 if (Ccb->DirectorySearchPattern.Buffer != NULL) {
377 DEC_MEM_COUNT(PS_DIR_PATTERN, Ccb->DirectorySearchPattern.Buffer,
378 Ccb->DirectorySearchPattern.MaximumLength );
379 Ext2FreePool(Ccb->DirectorySearchPattern.Buffer, EXT2_DIRSP_MAGIC);
380 }
381
382 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2CcbLookasideList), Ccb);
383 DEC_MEM_COUNT(PS_CCB, Ccb, sizeof(EXT2_CCB));
384 }
385
386 PEXT2_INODE
387 Ext2AllocateInode (PEXT2_VCB Vcb)
388 {
389 PVOID inode = NULL;
390
391 inode = ExAllocateFromNPagedLookasideList(
392 &(Vcb->InodeLookasideList));
393 if (!inode) {
394 return NULL;
395 }
396
397 RtlZeroMemory(inode, INODE_SIZE);
398
399 DEBUG(DL_INF, ("ExtAllocateInode: Inode created: %ph.\n", inode));
400 INC_MEM_COUNT(PS_EXT2_INODE, inode, INODE_SIZE);
401
402 return inode;
403 }
404
405 VOID
406 Ext2DestroyInode (IN PEXT2_VCB Vcb, IN PEXT2_INODE inode)
407 {
408 ASSERT(inode != NULL);
409
410 DEBUG(DL_INF, ("Ext2FreeInode: Inode = %ph.\n", inode));
411
412 ExFreeToNPagedLookasideList(&(Vcb->InodeLookasideList), inode);
413 DEC_MEM_COUNT(PS_EXT2_INODE, inode, INODE_SIZE);
414 }
415
416 struct dentry * Ext2AllocateEntry()
417 {
418 struct dentry *de;
419
420 de = (struct dentry *)ExAllocateFromNPagedLookasideList(
421 &(Ext2Global->Ext2DentryLookasideList));
422 if (!de) {
423 return NULL;
424 }
425
426 RtlZeroMemory(de, sizeof(struct dentry));
427 INC_MEM_COUNT(PS_DENTRY, de, sizeof(struct dentry));
428
429 return de;
430 }
431
432 VOID Ext2FreeEntry (IN struct dentry *de)
433 {
434 ASSERT(de != NULL);
435
436 if (de->d_name.name)
437 ExFreePool(de->d_name.name);
438
439 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2DentryLookasideList), de);
440 DEC_MEM_COUNT(PS_DENTRY, de, sizeof(struct dentry));
441 }
442
443
444 struct dentry *Ext2BuildEntry(PEXT2_VCB Vcb, PEXT2_MCB Dcb, PUNICODE_STRING FileName)
445 {
446 OEM_STRING Oem = { 0 };
447 struct dentry *de = NULL;
448 NTSTATUS Status = STATUS_INSUFFICIENT_RESOURCES;
449
450 _SEH2_TRY {
451
452 de = Ext2AllocateEntry();
453 if (!de) {
454 DEBUG(DL_ERR, ("Ext2BuildEntry: failed to allocate dentry.\n"));
455 _SEH2_LEAVE;
456 }
457 de->d_sb = &Vcb->sb;
458 if (Dcb)
459 de->d_parent = Dcb->de;
460
461 Oem.MaximumLength = (USHORT)Ext2UnicodeToOEMSize(Vcb, FileName) + 1;
462 Oem.Buffer = ExAllocatePool(PagedPool, Oem.MaximumLength);
463 if (!Oem.Buffer) {
464 DEBUG(DL_ERR, ( "Ex2BuildEntry: failed to allocate OEM name.\n"));
465 _SEH2_LEAVE;
466 }
467 de->d_name.name = Oem.Buffer;
468 RtlZeroMemory(Oem.Buffer, Oem.MaximumLength);
469 Status = Ext2UnicodeToOEM(Vcb, &Oem, FileName);
470 if (!NT_SUCCESS(Status)) {
471 DEBUG(DL_CP, ("Ext2BuildEntry: failed to convert %S to OEM.\n", FileName->Buffer));
472 _SEH2_LEAVE;
473 }
474 de->d_name.len = Oem.Length;
475
476 } _SEH2_FINALLY {
477
478 if (!NT_SUCCESS(Status)) {
479 if (de)
480 Ext2FreeEntry(de);
481 }
482 } _SEH2_END;
483
484 return de;
485 }
486
487 PEXT2_EXTENT
488 Ext2AllocateExtent ()
489 {
490 PEXT2_EXTENT Extent;
491
492 Extent = (PEXT2_EXTENT)ExAllocateFromNPagedLookasideList(
493 &(Ext2Global->Ext2ExtLookasideList));
494 if (!Extent) {
495 return NULL;
496 }
497
498 RtlZeroMemory(Extent, sizeof(EXT2_EXTENT));
499 INC_MEM_COUNT(PS_EXTENT, Extent, sizeof(EXT2_EXTENT));
500
501 return Extent;
502 }
503
504 VOID
505 Ext2FreeExtent (IN PEXT2_EXTENT Extent)
506 {
507 ASSERT(Extent != NULL);
508 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2ExtLookasideList), Extent);
509 DEC_MEM_COUNT(PS_EXTENT, Extent, sizeof(EXT2_EXTENT));
510 }
511
512 ULONG
513 Ext2CountExtents(IN PEXT2_EXTENT Chain)
514 {
515 ULONG count = 0;
516 PEXT2_EXTENT List = Chain;
517
518 while (List) {
519 count += 1;
520 List = List->Next;
521 }
522
523 return count;
524 }
525
526 VOID
527 Ext2JointExtents(
528 IN PEXT2_EXTENT Chain,
529 IN PEXT2_EXTENT Extent
530 )
531 {
532 #ifndef __REACTOS__
533 ULONG count = 0;
534 #endif
535 PEXT2_EXTENT List = Chain;
536
537 while (List->Next) {
538 List = List->Next;
539 }
540
541 List->Next = Extent;
542 }
543
544
545 VOID
546 Ext2DestroyExtentChain(IN PEXT2_EXTENT Chain)
547 {
548 PEXT2_EXTENT Extent = NULL, List = Chain;
549
550 while (List) {
551 Extent = List->Next;
552 Ext2FreeExtent(List);
553 List = Extent;
554 }
555 }
556
557 BOOLEAN
558 Ext2ListExtents(PLARGE_MCB Extents)
559 {
560 if (FsRtlNumberOfRunsInLargeMcb(Extents) != 0) {
561
562 LONGLONG DirtyVba;
563 LONGLONG DirtyLba;
564 LONGLONG DirtyLength;
565 int i, n = 0;
566
567 for (i = 0; FsRtlGetNextLargeMcbEntry(
568 Extents, i, &DirtyVba,
569 &DirtyLba, &DirtyLength); i++) {
570 if (DirtyVba > 0 && DirtyLba != -1) {
571 DEBUG(DL_EXT, ("Vba:%I64xh Lba:%I64xh Len:%I64xh.\n", DirtyVba, DirtyLba, DirtyLength));
572 n++;
573 }
574 }
575
576 return n ? TRUE : FALSE;
577 }
578
579 return FALSE;
580 }
581
582 VOID
583 Ext2CheckExtent(
584 PLARGE_MCB Zone,
585 LONGLONG Vbn,
586 LONGLONG Lbn,
587 LONGLONG Length,
588 BOOLEAN bAdded
589 )
590 {
591 #if EXT2_DEBUG
592 LONGLONG DirtyLbn;
593 LONGLONG DirtyLen;
594 LONGLONG RunStart;
595 LONGLONG RunLength;
596 ULONG Index;
597 BOOLEAN bFound = FALSE;
598
599 bFound = FsRtlLookupLargeMcbEntry(
600 Zone,
601 Vbn,
602 &DirtyLbn,
603 &DirtyLen,
604 &RunStart,
605 &RunLength,
606 &Index );
607
608 if (!bAdded && (!bFound || DirtyLbn == -1)) {
609 return;
610 }
611
612 if ( !bFound || (DirtyLbn == -1) ||
613 (DirtyLbn != Lbn) ||
614 (DirtyLen < Length)) {
615
616 DbgBreak();
617
618 for (Index = 0; TRUE; Index++) {
619
620 if (!FsRtlGetNextLargeMcbEntry(
621 Zone,
622 Index,
623 &Vbn,
624 &Lbn,
625 &Length)) {
626 break;
627 }
628
629 DEBUG(DL_EXT, ("Index = %xh Vbn = %I64xh Lbn = %I64xh Len = %I64xh\n",
630 Index, Vbn, Lbn, Length ));
631 }
632 }
633 #endif
634 }
635
636 VOID
637 Ext2ClearAllExtents(PLARGE_MCB Zone)
638 {
639 _SEH2_TRY {
640 FsRtlTruncateLargeMcb(Zone, (LONGLONG)0);
641 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
642 DbgBreak();
643 } _SEH2_END;
644 }
645
646
647 BOOLEAN
648 Ext2AddVcbExtent (
649 IN PEXT2_VCB Vcb,
650 IN LONGLONG Vbn,
651 IN LONGLONG Length
652 )
653 {
654 ULONG TriedTimes = 0;
655
656 LONGLONG Offset = 0;
657 BOOLEAN rc = FALSE;
658
659 Offset = Vbn & (~(Vcb->IoUnitSize - 1));
660 Length = (Vbn - Offset + Length + Vcb->IoUnitSize - 1) &
661 ~(Vcb->IoUnitSize - 1);
662
663 ASSERT ((Offset & (Vcb->IoUnitSize - 1)) == 0);
664 ASSERT ((Length & (Vcb->IoUnitSize - 1)) == 0);
665
666 Offset = (Offset >> Vcb->IoUnitBits) + 1;
667 Length = (Length >> Vcb->IoUnitBits);
668
669 Again:
670
671 _SEH2_TRY {
672 rc = FsRtlAddLargeMcbEntry(
673 &Vcb->Extents,
674 Offset,
675 Offset,
676 Length
677 );
678 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
679 DbgBreak();
680 rc = FALSE;
681 } _SEH2_END;
682
683 if (!rc && ++TriedTimes < 10) {
684 Ext2Sleep(TriedTimes * 100);
685 goto Again;
686 }
687
688 DEBUG(DL_EXT, ("Ext2AddVcbExtent: Vbn=%I64xh Length=%I64xh,"
689 " rc=%d Runs=%u\n", Offset, Length, rc,
690 FsRtlNumberOfRunsInLargeMcb(&Vcb->Extents)));
691
692 if (rc) {
693 Ext2CheckExtent(&Vcb->Extents, Offset, Offset, Length, TRUE);
694 }
695
696 return rc;
697 }
698
699 BOOLEAN
700 Ext2RemoveVcbExtent (
701 IN PEXT2_VCB Vcb,
702 IN LONGLONG Vbn,
703 IN LONGLONG Length
704 )
705 {
706 ULONG TriedTimes = 0;
707 LONGLONG Offset = 0;
708 BOOLEAN rc = TRUE;
709
710 Offset = Vbn & (~(Vcb->IoUnitSize - 1));
711 Length = (Length + Vbn - Offset + Vcb->IoUnitSize - 1) & (~(Vcb->IoUnitSize - 1));
712
713 ASSERT ((Offset & (Vcb->IoUnitSize - 1)) == 0);
714 ASSERT ((Length & (Vcb->IoUnitSize - 1)) == 0);
715
716 Offset = (Offset >> Vcb->IoUnitBits) + 1;
717 Length = (Length >> Vcb->IoUnitBits);
718
719 Again:
720
721 _SEH2_TRY {
722 FsRtlRemoveLargeMcbEntry(
723 &Vcb->Extents,
724 Offset,
725 Length
726 );
727 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
728 DbgBreak();
729 rc = FALSE;
730 } _SEH2_END;
731
732 if (!rc && ++TriedTimes < 10) {
733 Ext2Sleep(TriedTimes * 100);
734 goto Again;
735 }
736
737 DEBUG(DL_EXT, ("Ext2RemoveVcbExtent: Vbn=%I64xh Length=%I64xh Runs=%u\n",
738 Offset, Length, FsRtlNumberOfRunsInLargeMcb(&Vcb->Extents)));
739 if (rc) {
740 Ext2CheckExtent(&Vcb->Extents, Offset, 0, Length, FALSE);
741 }
742
743 return rc;
744 }
745
746 BOOLEAN
747 Ext2LookupVcbExtent (
748 IN PEXT2_VCB Vcb,
749 IN LONGLONG Vbn,
750 OUT PLONGLONG Lbn,
751 OUT PLONGLONG Length
752 )
753 {
754 LONGLONG offset;
755 BOOLEAN rc;
756
757 offset = Vbn & (~(Vcb->IoUnitSize - 1));
758 ASSERT ((offset & (Vcb->IoUnitSize - 1)) == 0);
759 offset = (offset >> Vcb->IoUnitBits) + 1;
760
761 rc = FsRtlLookupLargeMcbEntry(
762 &(Vcb->Extents),
763 offset,
764 Lbn,
765 Length,
766 NULL,
767 NULL,
768 NULL
769 );
770
771 if (rc) {
772
773 if (Lbn && ((*Lbn) != -1)) {
774 ASSERT((*Lbn) > 0);
775 (*Lbn) = (((*Lbn) - 1) << Vcb->IoUnitBits);
776 (*Lbn) += ((Vbn) & (Vcb->IoUnitSize - 1));
777 }
778
779 if (Length && *Length) {
780 (*Length) <<= Vcb->IoUnitBits;
781 (*Length) -= ((Vbn) & (Vcb->IoUnitSize - 1));
782 }
783 }
784
785 return rc;
786 }
787
788
789 BOOLEAN
790 Ext2AddMcbExtent (
791 IN PEXT2_VCB Vcb,
792 IN PEXT2_MCB Mcb,
793 IN LONGLONG Vbn,
794 IN LONGLONG Lbn,
795 IN LONGLONG Length
796 )
797 {
798 ULONG TriedTimes = 0;
799 LONGLONG Base = 0;
800 UCHAR Bits = 0;
801 BOOLEAN rc = FALSE;
802
803 Base = (LONGLONG)BLOCK_SIZE;
804 Bits = (UCHAR)BLOCK_BITS;
805
806 ASSERT ((Vbn & (Base - 1)) == 0);
807 ASSERT ((Lbn & (Base - 1)) == 0);
808 ASSERT ((Length & (Base - 1)) == 0);
809
810 Vbn = (Vbn >> Bits) + 1;
811 Lbn = (Lbn >> Bits) + 1;
812 Length = (Length >> Bits);
813
814 Again:
815
816 _SEH2_TRY {
817
818 rc = FsRtlAddLargeMcbEntry(
819 &Mcb->Extents,
820 Vbn,
821 Lbn,
822 Length
823 );
824
825 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
826
827 DbgBreak();
828 rc = FALSE;
829 } _SEH2_END;
830
831 if (!rc && ++TriedTimes < 10) {
832 Ext2Sleep(TriedTimes * 100);
833 goto Again;
834 }
835
836 DEBUG(DL_EXT, ("Ext2AddMcbExtent: Vbn=%I64xh Lbn=%I64xh Length=%I64xh,"
837 " rc=%d Runs=%u\n", Vbn, Lbn, Length, rc,
838 FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents)));
839
840 if (rc) {
841 Ext2CheckExtent(&Mcb->Extents, Vbn, Lbn, Length, TRUE);
842 }
843
844 return rc;
845 }
846
847 BOOLEAN
848 Ext2RemoveMcbExtent (
849 IN PEXT2_VCB Vcb,
850 IN PEXT2_MCB Mcb,
851 IN LONGLONG Vbn,
852 IN LONGLONG Length
853 )
854 {
855 ULONG TriedTimes = 0;
856 LONGLONG Base = 0;
857 UCHAR Bits = 0;
858 BOOLEAN rc = TRUE;
859
860 Base = (LONGLONG)BLOCK_SIZE;
861 Bits = (UCHAR)BLOCK_BITS;
862
863 ASSERT ((Vbn & (Base - 1)) == 0);
864 ASSERT ((Length & (Base - 1)) == 0);
865
866 Vbn = (Vbn >> Bits) + 1;
867 Length = (Length >> Bits);
868
869 Again:
870
871 _SEH2_TRY {
872 FsRtlRemoveLargeMcbEntry(
873 &Mcb->Extents,
874 Vbn,
875 Length
876 );
877 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
878 DbgBreak();
879 rc = FALSE;
880 } _SEH2_END;
881
882 if (!rc && ++TriedTimes < 10) {
883 Ext2Sleep(TriedTimes * 100);
884 goto Again;
885 }
886
887 DEBUG(DL_EXT, ("Ext2RemoveMcbExtent: Vbn=%I64xh Length=%I64xh Runs=%u\n",
888 Vbn, Length, FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents)));
889 if (rc) {
890 Ext2CheckExtent(&Mcb->Extents, Vbn, 0, Length, FALSE);
891 }
892
893 return rc;
894 }
895
896 BOOLEAN
897 Ext2LookupMcbExtent (
898 IN PEXT2_VCB Vcb,
899 IN PEXT2_MCB Mcb,
900 IN LONGLONG Vbn,
901 OUT PLONGLONG Lbn,
902 OUT PLONGLONG Length
903 )
904 {
905 LONGLONG offset;
906 BOOLEAN rc;
907
908 offset = Vbn & (~((LONGLONG)BLOCK_SIZE - 1));
909 ASSERT ((offset & (BLOCK_SIZE - 1)) == 0);
910 offset = (offset >> BLOCK_BITS) + 1;
911
912 rc = FsRtlLookupLargeMcbEntry(
913 &(Mcb->Extents),
914 offset,
915 Lbn,
916 Length,
917 NULL,
918 NULL,
919 NULL
920 );
921
922 if (rc) {
923
924 if (Lbn && ((*Lbn) != -1)) {
925 ASSERT((*Lbn) > 0);
926 (*Lbn) = (((*Lbn) - 1) << BLOCK_BITS);
927 (*Lbn) += ((Vbn) & ((LONGLONG)BLOCK_SIZE - 1));
928 }
929
930 if (Length && *Length) {
931 (*Length) <<= BLOCK_BITS;
932 (*Length) -= ((Vbn) & ((LONGLONG)BLOCK_SIZE - 1));
933 }
934 }
935
936 return rc;
937 }
938
939
940 BOOLEAN
941 Ext2AddMcbMetaExts (
942 IN PEXT2_VCB Vcb,
943 IN PEXT2_MCB Mcb,
944 IN ULONG Block,
945 IN ULONG Length
946 )
947 {
948 ULONG TriedTimes = 0;
949 LONGLONG Lbn = Block + 1;
950 BOOLEAN rc = TRUE;
951
952 Again:
953
954 _SEH2_TRY {
955
956 rc = FsRtlAddLargeMcbEntry(
957 &Mcb->MetaExts,
958 Lbn,
959 Lbn,
960 Length
961 );
962
963 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
964
965 DbgBreak();
966 rc = FALSE;
967 } _SEH2_END;
968
969 if (!rc && ++TriedTimes < 10) {
970 Ext2Sleep(TriedTimes * 100);
971 goto Again;
972 }
973
974 DEBUG(DL_EXT, ("Ext2AddMcbMetaExts: Block: %xh-%xh rc=%d Runs=%u\n", Block,
975 Length, rc, FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts)));
976
977 if (rc) {
978 Ext2CheckExtent(&Mcb->MetaExts, Lbn, Lbn, Length, TRUE);
979 }
980
981 return rc;
982 }
983
984 BOOLEAN
985 Ext2RemoveMcbMetaExts (
986 IN PEXT2_VCB Vcb,
987 IN PEXT2_MCB Mcb,
988 IN ULONG Block,
989 IN ULONG Length
990 )
991 {
992 ULONG TriedTimes = 0;
993 LONGLONG Lbn = Block + 1;
994 BOOLEAN rc = TRUE;
995
996 Again:
997
998 _SEH2_TRY {
999
1000 FsRtlRemoveLargeMcbEntry(
1001 &Mcb->MetaExts,
1002 Lbn,
1003 Length
1004 );
1005
1006 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
1007 DbgBreak();
1008 rc = FALSE;
1009 } _SEH2_END;
1010
1011 if (!rc && ++TriedTimes < 10) {
1012 Ext2Sleep(TriedTimes * 100);
1013 goto Again;
1014 }
1015
1016 DEBUG(DL_EXT, ("Ext2RemoveMcbMetaExts: Block: %xh-%xhh Runs=%u\n", Block,
1017 Length, FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts)));
1018 if (rc) {
1019 Ext2CheckExtent(&Mcb->MetaExts, Lbn, 0, Length, FALSE);
1020 }
1021
1022 return rc;
1023 }
1024
1025
1026 BOOLEAN
1027 Ext2AddBlockExtent(
1028 IN PEXT2_VCB Vcb,
1029 IN PEXT2_MCB Mcb,
1030 IN ULONG Start,
1031 IN ULONG Block,
1032 IN ULONG Number
1033 )
1034 {
1035 LONGLONG Vbn = 0;
1036 LONGLONG Lbn = 0;
1037 LONGLONG Length = 0;
1038
1039 Vbn = ((LONGLONG) Start) << BLOCK_BITS;
1040 Lbn = ((LONGLONG) Block) << BLOCK_BITS;
1041 Length = ((LONGLONG)Number << BLOCK_BITS);
1042
1043 if (Mcb) {
1044 #if EXT2_DEBUG
1045 ULONG _block = 0, _mapped = 0;
1046 BOOLEAN _rc = Ext2LookupBlockExtent(Vcb, Mcb, Start, &_block, &_mapped);
1047 if (_rc && _block != 0 && (_block != Block)) {
1048 DbgBreak();
1049 }
1050 #endif
1051 return Ext2AddMcbExtent(Vcb, Mcb, Vbn, Lbn, Length);
1052
1053 }
1054
1055 ASSERT(Start == Block);
1056 return Ext2AddVcbExtent(Vcb, Vbn, Length);
1057 }
1058
1059
1060 BOOLEAN
1061 Ext2LookupBlockExtent(
1062 IN PEXT2_VCB Vcb,
1063 IN PEXT2_MCB Mcb,
1064 IN ULONG Start,
1065 IN PULONG Block,
1066 IN PULONG Mapped
1067 )
1068 {
1069 LONGLONG Vbn = 0;
1070 LONGLONG Lbn = 0;
1071 LONGLONG Length = 0;
1072
1073 BOOLEAN rc = FALSE;
1074
1075 Vbn = ((LONGLONG) Start) << BLOCK_BITS;
1076
1077 if (Mcb) {
1078 rc = Ext2LookupMcbExtent(Vcb, Mcb, Vbn, &Lbn, &Length);
1079 } else {
1080 rc = Ext2LookupVcbExtent(Vcb, Vbn, &Lbn, &Length);
1081 }
1082
1083 if (rc) {
1084 *Mapped = (ULONG)(Length >> BLOCK_BITS);
1085 if (Lbn != -1 && Length > 0) {
1086 *Block = (ULONG)(Lbn >> BLOCK_BITS);
1087 } else {
1088 *Block = 0;
1089 }
1090 }
1091
1092 return rc;
1093 }
1094
1095
1096 BOOLEAN
1097 Ext2RemoveBlockExtent(
1098 IN PEXT2_VCB Vcb,
1099 IN PEXT2_MCB Mcb,
1100 IN ULONG Start,
1101 IN ULONG Number
1102 )
1103 {
1104 LONGLONG Vbn = 0;
1105 LONGLONG Length = 0;
1106 BOOLEAN rc;
1107
1108 Vbn = ((LONGLONG) Start) << BLOCK_BITS;
1109 Length = ((LONGLONG)Number << BLOCK_BITS);
1110
1111 if (Mcb) {
1112 rc = Ext2RemoveMcbExtent(Vcb, Mcb, Vbn, Length);
1113 } else {
1114 rc = Ext2RemoveVcbExtent(Vcb, Vbn, Length);
1115 }
1116
1117 return rc;
1118 }
1119
1120 NTSTATUS
1121 Ext2InitializeZone(
1122 IN PEXT2_IRP_CONTEXT IrpContext,
1123 IN PEXT2_VCB Vcb,
1124 IN PEXT2_MCB Mcb
1125 )
1126 {
1127 NTSTATUS Status = STATUS_SUCCESS;
1128
1129 ULONG Start = 0;
1130 ULONG End;
1131 ULONG Block;
1132 ULONG Mapped;
1133
1134 Ext2ClearAllExtents(&Mcb->Extents);
1135 Ext2ClearAllExtents(&Mcb->MetaExts);
1136
1137 ASSERT(Mcb != NULL);
1138 End = (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS);
1139
1140 while (Start < End) {
1141
1142 Block = Mapped = 0;
1143
1144 /* mapping file offset to ext2 block */
1145 if (INODE_HAS_EXTENT(&Mcb->Inode)) {
1146 Status = Ext2MapExtent(
1147 IrpContext,
1148 Vcb,
1149 Mcb,
1150 Start,
1151 FALSE,
1152 &Block,
1153 &Mapped
1154 );
1155 } else {
1156 Status = Ext2MapIndirect(
1157 IrpContext,
1158 Vcb,
1159 Mcb,
1160 Start,
1161 FALSE,
1162 &Block,
1163 &Mapped
1164 );
1165 }
1166
1167 if (!NT_SUCCESS(Status)) {
1168 goto errorout;
1169 }
1170
1171 /* skip wrong blocks, in case wrongly treating symlink
1172 target names as blocks, silly */
1173 if (Block >= TOTAL_BLOCKS) {
1174 Block = 0;
1175 }
1176
1177 if (Block) {
1178 if (!Ext2AddBlockExtent(Vcb, Mcb, Start, Block, Mapped)) {
1179 DbgBreak();
1180 ClearFlag(Mcb->Flags, MCB_ZONE_INITED);
1181 Ext2ClearAllExtents(&Mcb->Extents);
1182 Status = STATUS_INSUFFICIENT_RESOURCES;
1183 goto errorout;
1184 }
1185 DEBUG(DL_MAP, ("Ext2InitializeZone %wZ: Block = %xh Mapped = %xh\n",
1186 &Mcb->FullName, Block, Mapped));
1187 }
1188
1189 /* Mapped is total number of continous blocks or NULL blocks */
1190 Start += Mapped;
1191 }
1192
1193 /* set mcb zone as initialized */
1194 SetLongFlag(Mcb->Flags, MCB_ZONE_INITED);
1195
1196 errorout:
1197
1198 if (!IsZoneInited(Mcb)) {
1199 Ext2ClearAllExtents(&Mcb->Extents);
1200 Ext2ClearAllExtents(&Mcb->MetaExts);
1201 }
1202
1203 return Status;
1204 }
1205
1206 NTSTATUS
1207 Ext2BuildExtents(
1208 IN PEXT2_IRP_CONTEXT IrpContext,
1209 IN PEXT2_VCB Vcb,
1210 IN PEXT2_MCB Mcb,
1211 IN ULONGLONG Offset,
1212 IN ULONG Size,
1213 IN BOOLEAN bAlloc,
1214 OUT PEXT2_EXTENT * Chain
1215 )
1216 {
1217 ULONG Start, End;
1218 ULONG Total = 0;
1219
1220 LONGLONG Lba = 0;
1221 NTSTATUS Status = STATUS_SUCCESS;
1222
1223 PEXT2_EXTENT Extent = NULL;
1224 PEXT2_EXTENT List = *Chain = NULL;
1225
1226 if (!IsZoneInited(Mcb)) {
1227 Status = Ext2InitializeZone(IrpContext, Vcb, Mcb);
1228 if (!NT_SUCCESS(Status)) {
1229 DbgBreak();
1230 }
1231 }
1232
1233 if ((IrpContext && IrpContext->Irp) &&
1234 ((IrpContext->Irp->Flags & IRP_NOCACHE) ||
1235 (IrpContext->Irp->Flags & IRP_PAGING_IO))) {
1236 Size = (Size + SECTOR_SIZE - 1) & (~(SECTOR_SIZE - 1));
1237 }
1238
1239 Start = (ULONG)(Offset >> BLOCK_BITS);
1240 End = (ULONG)((Size + Offset + BLOCK_SIZE - 1) >> BLOCK_BITS);
1241
1242 if (End > (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS) ) {
1243 End = (ULONG)((Mcb->Inode.i_size + BLOCK_SIZE - 1) >> BLOCK_BITS);
1244 }
1245
1246 while (Size > 0 && Start < End) {
1247
1248 ULONG Mapped = 0;
1249 ULONG Length = 0;
1250 ULONG Block = 0;
1251
1252 BOOLEAN rc = FALSE;
1253
1254 /* try to map file offset to ext2 block upon Extents cache */
1255 if (IsZoneInited(Mcb)) {
1256 rc = Ext2LookupBlockExtent(
1257 Vcb,
1258 Mcb,
1259 Start,
1260 &Block,
1261 &Mapped);
1262
1263 if (!rc) {
1264 /* we likely get a sparse file here */
1265 Mapped = 1;
1266 Block = 0;
1267 }
1268 }
1269
1270 /* try to BlockMap in case failed to access Extents cache */
1271 if (!IsZoneInited(Mcb) || (bAlloc && Block == 0)) {
1272
1273 Status = Ext2BlockMap(
1274 IrpContext,
1275 Vcb,
1276 Mcb,
1277 Start,
1278 bAlloc,
1279 &Block,
1280 &Mapped
1281 );
1282 if (!NT_SUCCESS(Status)) {
1283 break;
1284 }
1285
1286 /* skip wrong blocks, in case wrongly treating symlink
1287 target names as blocks, silly */
1288 if (Block >= TOTAL_BLOCKS) {
1289 Block = 0;
1290 }
1291
1292 /* add new allocated blocks to Mcb zone */
1293 if (IsZoneInited(Mcb) && Block) {
1294 if (!Ext2AddBlockExtent(Vcb, Mcb, Start, Block, Mapped)) {
1295 DbgBreak();
1296 ClearFlag(Mcb->Flags, MCB_ZONE_INITED);
1297 Ext2ClearAllExtents(&Mcb->Extents);
1298 }
1299 }
1300 }
1301
1302 /* calculate i/o extent */
1303 Lba = ((LONGLONG)Block << BLOCK_BITS) + Offset - ((LONGLONG)Start << BLOCK_BITS);
1304 Length = (ULONG)(((LONGLONG)(Start + Mapped) << BLOCK_BITS) - Offset);
1305 if (Length > Size) {
1306 Length = Size;
1307 }
1308
1309 if (0 == Length) {
1310 DbgBreak();
1311 break;
1312 }
1313
1314 Start += Mapped;
1315 Offset = (ULONGLONG)Start << BLOCK_BITS;
1316
1317 if (Block != 0) {
1318
1319 if (List && List->Lba + List->Length == Lba) {
1320
1321 /* it's continuous upon previous Extent */
1322 List->Length += Length;
1323
1324 } else {
1325
1326 /* have to allocate a new Extent */
1327 Extent = Ext2AllocateExtent();
1328 if (!Extent) {
1329 Status = STATUS_INSUFFICIENT_RESOURCES;
1330 DbgBreak();
1331 break;
1332 }
1333
1334 Extent->Lba = Lba;
1335 Extent->Length = Length;
1336 Extent->Offset = Total;
1337
1338 /* insert new Extent to chain */
1339 if (List) {
1340 List->Next = Extent;
1341 List = Extent;
1342 } else {
1343 *Chain = List = Extent;
1344 }
1345 }
1346 } else {
1347 if (bAlloc) {
1348 DbgBreak();
1349 }
1350 }
1351
1352 Total += Length;
1353 Size -= Length;
1354 }
1355
1356 return Status;
1357 }
1358
1359
1360 BOOLEAN
1361 Ext2BuildName(
1362 IN OUT PUNICODE_STRING Target,
1363 IN PUNICODE_STRING File,
1364 IN PUNICODE_STRING Parent
1365 )
1366 {
1367 USHORT Length = 0;
1368 USHORT ParentLen = 0;
1369 BOOLEAN bBackslash = TRUE;
1370
1371 /* free the original buffer */
1372 if (Target->Buffer) {
1373 DEC_MEM_COUNT(PS_MCB_NAME, Target->Buffer, Target->MaximumLength);
1374 Ext2FreePool(Target->Buffer, EXT2_FNAME_MAGIC);
1375 Target->Length = Target->MaximumLength = 0;
1376 }
1377
1378 /* check the parent directory's name and backslash */
1379 if (Parent && Parent->Buffer && Parent->Length > 0) {
1380 ParentLen = Parent->Length / sizeof(WCHAR);
1381 if (Parent->Buffer[ParentLen - 1] == L'\\') {
1382 bBackslash = FALSE;
1383 }
1384 }
1385
1386 if (Parent == NULL || File->Buffer[0] == L'\\') {
1387 /* must be root inode */
1388 ASSERT(ParentLen == 0);
1389 bBackslash = FALSE;
1390 }
1391
1392 /* allocate and initialize new name buffer */
1393 Length = File->Length;
1394 Length += (ParentLen + (bBackslash ? 1 : 0)) * sizeof(WCHAR);
1395
1396 Target->Buffer = Ext2AllocatePool(
1397 PagedPool,
1398 Length + 2,
1399 EXT2_FNAME_MAGIC
1400 );
1401
1402 if (!Target->Buffer) {
1403 DEBUG(DL_ERR, ( "Ex2BuildName: failed to allocate name bufer.\n"));
1404 return FALSE;
1405 }
1406 RtlZeroMemory(Target->Buffer, Length + 2);
1407
1408 if (ParentLen) {
1409 RtlCopyMemory(&Target->Buffer[0],
1410 Parent->Buffer,
1411 ParentLen * sizeof(WCHAR));
1412 }
1413
1414 if (bBackslash) {
1415 Target->Buffer[ParentLen++] = L'\\';
1416 }
1417
1418 RtlCopyMemory( &Target->Buffer[ParentLen],
1419 File->Buffer,
1420 File->Length);
1421
1422 INC_MEM_COUNT(PS_MCB_NAME, Target->Buffer, Length + 2);
1423 Target->Length = Length;
1424 Target->MaximumLength = Length + 2;
1425
1426 return TRUE;
1427 }
1428
1429 PEXT2_MCB
1430 Ext2AllocateMcb (
1431 IN PEXT2_VCB Vcb,
1432 IN PUNICODE_STRING FileName,
1433 IN PUNICODE_STRING Parent,
1434 IN ULONG FileAttr
1435 )
1436 {
1437 PEXT2_MCB Mcb = NULL;
1438 NTSTATUS Status = STATUS_SUCCESS;
1439
1440 /* need wake the reaper thread if there are many Mcb allocated */
1441 if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 4)) {
1442 KeSetEvent(&Ext2Global->McbReaper.Wait, 0, FALSE);
1443 }
1444
1445 /* allocate Mcb from LookasideList */
1446 Mcb = (PEXT2_MCB) (ExAllocateFromNPagedLookasideList(
1447 &(Ext2Global->Ext2McbLookasideList)));
1448
1449 if (Mcb == NULL) {
1450 return NULL;
1451 }
1452
1453 /* initialize Mcb header */
1454 RtlZeroMemory(Mcb, sizeof(EXT2_MCB));
1455 Mcb->Identifier.Type = EXT2MCB;
1456 Mcb->Identifier.Size = sizeof(EXT2_MCB);
1457 Mcb->FileAttr = FileAttr;
1458
1459 Mcb->Inode.i_priv = (PVOID)Mcb;
1460 Mcb->Inode.i_sb = &Vcb->sb;
1461
1462 /* initialize Mcb names */
1463 if (FileName) {
1464
1465 #if EXT2_DEBUG
1466 if ( FileName->Length == 2 &&
1467 FileName->Buffer[0] == L'\\') {
1468 DEBUG(DL_RES, ( "Ext2AllocateMcb: Root Mcb is to be created !\n"));
1469 }
1470
1471 if ( FileName->Length == 2 &&
1472 FileName->Buffer[0] == L'.') {
1473 DbgBreak();
1474 }
1475
1476 if ( FileName->Length == 4 &&
1477 FileName->Buffer[0] == L'.' &&
1478 FileName->Buffer[1] == L'.' ) {
1479 DbgBreak();
1480 }
1481 #endif
1482
1483 if (( FileName->Length >= 4 && FileName->Buffer[0] == L'.') &&
1484 ((FileName->Length == 4 && FileName->Buffer[1] != L'.') ||
1485 FileName->Length >= 6 )) {
1486 SetFlag(Mcb->FileAttr, FILE_ATTRIBUTE_HIDDEN);
1487 }
1488
1489 if (!Ext2BuildName(&Mcb->ShortName, FileName, NULL)) {
1490 goto errorout;
1491 }
1492 if (!Ext2BuildName(&Mcb->FullName, FileName, Parent)) {
1493 goto errorout;
1494 }
1495 }
1496
1497 /* initialize Mcb Extents, it will raise an expcetion if failed */
1498 _SEH2_TRY {
1499 FsRtlInitializeLargeMcb(&(Mcb->Extents), NonPagedPool);
1500 FsRtlInitializeLargeMcb(&(Mcb->MetaExts), NonPagedPool);
1501 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
1502 Status = STATUS_INSUFFICIENT_RESOURCES;
1503 DbgBreak();
1504 } _SEH2_END;
1505
1506 if (!NT_SUCCESS(Status)) {
1507 goto errorout;
1508 }
1509
1510 INC_MEM_COUNT(PS_MCB, Mcb, sizeof(EXT2_MCB));
1511 DEBUG(DL_INF, ( "Ext2AllocateMcb: Mcb %wZ created.\n", &Mcb->FullName));
1512
1513 return Mcb;
1514
1515 errorout:
1516
1517 if (Mcb) {
1518
1519 if (Mcb->ShortName.Buffer) {
1520 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->ShortName.Buffer,
1521 Mcb->ShortName.MaximumLength);
1522 Ext2FreePool(Mcb->ShortName.Buffer, EXT2_FNAME_MAGIC);
1523 }
1524
1525 if (Mcb->FullName.Buffer) {
1526 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->FullName.Buffer,
1527 Mcb->FullName.MaximumLength);
1528 Ext2FreePool(Mcb->FullName.Buffer, EXT2_FNAME_MAGIC);
1529 }
1530
1531 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2McbLookasideList), Mcb);
1532 }
1533
1534 return NULL;
1535 }
1536
1537 VOID
1538 Ext2FreeMcb (IN PEXT2_VCB Vcb, IN PEXT2_MCB Mcb)
1539 {
1540 #ifndef __REACTOS__
1541 PEXT2_MCB Parent = Mcb->Parent;
1542 #endif
1543
1544 ASSERT(Mcb != NULL);
1545
1546 ASSERT((Mcb->Identifier.Type == EXT2MCB) &&
1547 (Mcb->Identifier.Size == sizeof(EXT2_MCB)));
1548
1549 if ((Mcb->Identifier.Type != EXT2MCB) ||
1550 (Mcb->Identifier.Size != sizeof(EXT2_MCB))) {
1551 return;
1552 }
1553
1554 DEBUG(DL_INF, ( "Ext2FreeMcb: Mcb %wZ will be freed.\n", &Mcb->FullName));
1555
1556 if (IsMcbSymLink(Mcb) && Mcb->Target) {
1557 Ext2DerefMcb(Mcb->Target);
1558 }
1559
1560 if (FsRtlNumberOfRunsInLargeMcb(&Mcb->Extents)) {
1561 DEBUG(DL_EXT, ("List data extents for: %wZ\n", &Mcb->FullName));
1562 Ext2ListExtents(&Mcb->Extents);
1563 }
1564 FsRtlUninitializeLargeMcb(&(Mcb->Extents));
1565 if (FsRtlNumberOfRunsInLargeMcb(&Mcb->MetaExts)) {
1566 DEBUG(DL_EXT, ("List meta extents for: %wZ\n", &Mcb->FullName));
1567 Ext2ListExtents(&Mcb->MetaExts);
1568 }
1569 FsRtlUninitializeLargeMcb(&(Mcb->MetaExts));
1570 ClearLongFlag(Mcb->Flags, MCB_ZONE_INITED);
1571
1572 if (Mcb->ShortName.Buffer) {
1573 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->ShortName.Buffer,
1574 Mcb->ShortName.MaximumLength);
1575 Ext2FreePool(Mcb->ShortName.Buffer, EXT2_FNAME_MAGIC);
1576 }
1577
1578 if (Mcb->FullName.Buffer) {
1579 DEC_MEM_COUNT(PS_MCB_NAME, Mcb->FullName.Buffer,
1580 Mcb->FullName.MaximumLength);
1581 Ext2FreePool(Mcb->FullName.Buffer, EXT2_FNAME_MAGIC);
1582 }
1583
1584 /* free dentry */
1585 if (Mcb->de) {
1586 Ext2FreeEntry(Mcb->de);
1587 }
1588
1589 Mcb->Identifier.Type = 0;
1590 Mcb->Identifier.Size = 0;
1591
1592 ExFreeToNPagedLookasideList(&(Ext2Global->Ext2McbLookasideList), Mcb);
1593 DEC_MEM_COUNT(PS_MCB, Mcb, sizeof(EXT2_MCB));
1594 }
1595
1596
1597 PEXT2_MCB
1598 Ext2SearchMcb(
1599 PEXT2_VCB Vcb,
1600 PEXT2_MCB Parent,
1601 PUNICODE_STRING FileName
1602 )
1603 {
1604 BOOLEAN LockAcquired = FALSE;
1605 PEXT2_MCB Mcb = NULL;
1606
1607 _SEH2_TRY {
1608 ExAcquireResourceSharedLite(&Vcb->McbLock, TRUE);
1609 LockAcquired = TRUE;
1610 Mcb = Ext2SearchMcbWithoutLock(Parent, FileName);
1611 } _SEH2_FINALLY {
1612 if (LockAcquired) {
1613 ExReleaseResourceLite(&Vcb->McbLock);
1614 }
1615 } _SEH2_END;
1616
1617 return Mcb;
1618 }
1619
1620
1621 PEXT2_MCB
1622 Ext2SearchMcbWithoutLock(
1623 PEXT2_MCB Parent,
1624 PUNICODE_STRING FileName
1625 )
1626 {
1627 PEXT2_MCB TmpMcb = NULL;
1628
1629 DEBUG(DL_RES, ("Ext2SearchMcb: %wZ\n", FileName));
1630
1631 _SEH2_TRY {
1632
1633 Ext2ReferMcb(Parent);
1634
1635 if (Ext2IsDot(FileName)) {
1636 TmpMcb = Parent;
1637 Ext2ReferMcb(Parent);
1638 _SEH2_LEAVE;
1639 }
1640
1641 if (Ext2IsDotDot(FileName)) {
1642 if (IsMcbRoot(Parent)) {
1643 TmpMcb = Parent;
1644 } else {
1645 TmpMcb = Parent->Parent;
1646 }
1647 if (TmpMcb) {
1648 Ext2ReferMcb(TmpMcb);
1649 }
1650 _SEH2_LEAVE;
1651 }
1652
1653 if (IsMcbSymLink(Parent)) {
1654 if (Parent->Target) {
1655 TmpMcb = Parent->Target->Child;
1656 ASSERT(!IsMcbSymLink(Parent->Target));
1657 } else {
1658 TmpMcb = NULL;
1659 _SEH2_LEAVE;
1660 }
1661 } else {
1662 TmpMcb = Parent->Child;
1663 }
1664
1665 while (TmpMcb) {
1666
1667 if (!RtlCompareUnicodeString(
1668 &(TmpMcb->ShortName),
1669 FileName, TRUE )) {
1670 Ext2ReferMcb(TmpMcb);
1671 break;
1672 }
1673
1674 TmpMcb = TmpMcb->Next;
1675 }
1676
1677 } _SEH2_FINALLY {
1678
1679 Ext2DerefMcb(Parent);
1680 } _SEH2_END;
1681
1682 return TmpMcb;
1683 }
1684
1685 VOID
1686 Ext2InsertMcb (
1687 PEXT2_VCB Vcb,
1688 PEXT2_MCB Parent,
1689 PEXT2_MCB Child
1690 )
1691 {
1692 BOOLEAN LockAcquired = FALSE;
1693 PEXT2_MCB Mcb = NULL;
1694
1695 _SEH2_TRY {
1696
1697 ExAcquireResourceExclusiveLite(
1698 &Vcb->McbLock,
1699 TRUE );
1700 LockAcquired = TRUE;
1701
1702 /* use it's target if it's a symlink */
1703 if (IsMcbSymLink(Parent)) {
1704 Parent = Parent->Target;
1705 ASSERT(!IsMcbSymLink(Parent));
1706 }
1707
1708 Mcb = Parent->Child;
1709 while (Mcb) {
1710 if (Mcb == Child) {
1711 break;
1712 }
1713 Mcb = Mcb->Next;
1714 }
1715
1716 if (Mcb) {
1717 /* already attached in the list */
1718 DEBUG(DL_ERR, ( "Ext2InsertMcb: Child Mcb is alreay attached.\n"));
1719 if (!IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) {
1720 SetLongFlag(Child->Flags, MCB_ENTRY_TREE);
1721 DEBUG(DL_ERR, ( "Ext2InsertMcb: Child Mcb's flag isn't set.\n"));
1722 }
1723
1724 DbgBreak();
1725
1726 } else {
1727
1728 /* insert this Mcb into the head */
1729 Child->Next = Parent->Child;
1730 Parent->Child = Child;
1731 Child->Parent = Parent;
1732 Child->de->d_parent = Parent->de;
1733 Ext2ReferMcb(Parent);
1734 SetLongFlag(Child->Flags, MCB_ENTRY_TREE);
1735 }
1736
1737 } _SEH2_FINALLY {
1738
1739 if (LockAcquired) {
1740 ExReleaseResourceLite(&Vcb->McbLock);
1741 }
1742 } _SEH2_END;
1743 }
1744
1745 BOOLEAN
1746 Ext2RemoveMcb (
1747 PEXT2_VCB Vcb,
1748 PEXT2_MCB Mcb
1749 )
1750 {
1751 PEXT2_MCB TmpMcb = NULL;
1752 BOOLEAN LockAcquired = FALSE;
1753 BOOLEAN bLinked = FALSE;
1754
1755 _SEH2_TRY {
1756
1757 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE);
1758 LockAcquired = TRUE;
1759
1760 if (Mcb->Parent) {
1761
1762 if (Mcb->Parent->Child == Mcb) {
1763 Mcb->Parent->Child = Mcb->Next;
1764 bLinked = TRUE;
1765 } else {
1766 TmpMcb = Mcb->Parent->Child;
1767
1768 while (TmpMcb && TmpMcb->Next != Mcb) {
1769 TmpMcb = TmpMcb->Next;
1770 }
1771
1772 if (TmpMcb) {
1773 TmpMcb->Next = Mcb->Next;
1774 bLinked = TRUE;
1775 } else {
1776 /* we got errors: link broken */
1777 }
1778 }
1779
1780 if (bLinked) {
1781 if (IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) {
1782 DEBUG(DL_RES, ("Mcb %p %wZ removed from Mcb %p %wZ\n", Mcb,
1783 &Mcb->FullName, Mcb->Parent, &Mcb->Parent->FullName));
1784 Ext2DerefMcb(Mcb->Parent);
1785 ClearLongFlag(Mcb->Flags, MCB_ENTRY_TREE);
1786 } else {
1787 DbgBreak();
1788 }
1789 } else {
1790 if (IsFlagOn(Mcb->Flags, MCB_ENTRY_TREE)) {
1791 ClearLongFlag(Mcb->Flags, MCB_ENTRY_TREE);
1792 }
1793 DbgBreak();
1794 }
1795 Mcb->Parent = NULL;
1796 Mcb->de->d_parent = NULL;
1797 }
1798
1799 } _SEH2_FINALLY {
1800
1801 if (LockAcquired) {
1802 ExReleaseResourceLite(&Vcb->McbLock);
1803 }
1804 } _SEH2_END;
1805
1806 return TRUE;
1807 }
1808
1809 VOID
1810 Ext2CleanupAllMcbs(PEXT2_VCB Vcb)
1811 {
1812 BOOLEAN LockAcquired = FALSE;
1813 PEXT2_MCB Mcb = NULL;
1814
1815 _SEH2_TRY {
1816
1817 ExAcquireResourceExclusiveLite(
1818 &Vcb->McbLock,
1819 TRUE );
1820 LockAcquired = TRUE;
1821
1822 while ((Mcb = Ext2FirstUnusedMcb(Vcb, TRUE, Vcb->NumOfMcb)) != 0) {
1823 while (Mcb) {
1824 PEXT2_MCB Next = Mcb->Next;
1825 if (IsMcbSymLink(Mcb)) {
1826 Mcb->Target = NULL;
1827 }
1828 Ext2FreeMcb(Vcb, Mcb);
1829 Mcb = Next;
1830 }
1831 }
1832 Ext2FreeMcb(Vcb, Vcb->McbTree);
1833 Vcb->McbTree = NULL;
1834
1835 } _SEH2_FINALLY {
1836
1837 if (LockAcquired) {
1838 ExReleaseResourceLite(&Vcb->McbLock);
1839 }
1840 } _SEH2_END;
1841 }
1842
1843 BOOLEAN
1844 Ext2CheckSetBlock(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb, LONGLONG Block)
1845 {
1846 PEXT2_GROUP_DESC gd;
1847 struct buffer_head *gb = NULL;
1848 struct buffer_head *bh = NULL;
1849 ULONG group, dwBlk, Length;
1850 RTL_BITMAP bitmap;
1851 BOOLEAN bModified = FALSE;
1852
1853 group = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) / BLOCKS_PER_GROUP;
1854 dwBlk = (ULONG)(Block - EXT2_FIRST_DATA_BLOCK) % BLOCKS_PER_GROUP;
1855
1856 gd = ext4_get_group_desc(&Vcb->sb, group, &gb);
1857 if (!gd) {
1858 return FALSE;
1859 }
1860 bh = sb_getblk(&Vcb->sb, ext4_block_bitmap(&Vcb->sb, gd));
1861
1862 if (group == Vcb->sbi.s_groups_count - 1) {
1863 Length = (ULONG)(TOTAL_BLOCKS % BLOCKS_PER_GROUP);
1864
1865 /* s_blocks_count is integer multiple of s_blocks_per_group */
1866 if (Length == 0)
1867 Length = BLOCKS_PER_GROUP;
1868 } else {
1869 Length = BLOCKS_PER_GROUP;
1870 }
1871
1872 if (dwBlk >= Length) {
1873 fini_bh(&gb);
1874 fini_bh(&bh);
1875 return FALSE;
1876 }
1877
1878
1879 RtlInitializeBitMap(&bitmap, (PULONG)bh->b_data, Length);
1880
1881 if (RtlCheckBit(&bitmap, dwBlk) == 0) {
1882 DbgBreak();
1883 RtlSetBits(&bitmap, dwBlk, 1);
1884 bModified = TRUE;
1885 mark_buffer_dirty(bh);
1886 }
1887
1888 fini_bh(&gb);
1889 fini_bh(&bh);
1890
1891 return (!bModified);
1892 }
1893
1894 BOOLEAN
1895 Ext2CheckBitmapConsistency(PEXT2_IRP_CONTEXT IrpContext, PEXT2_VCB Vcb)
1896 {
1897 ULONG i, j, InodeBlocks;
1898
1899 for (i = 0; i < Vcb->sbi.s_groups_count; i++) {
1900
1901 PEXT2_GROUP_DESC gd;
1902 struct buffer_head *bh = NULL;
1903
1904 gd = ext4_get_group_desc(&Vcb->sb, i, &bh);
1905 if (!gd)
1906 continue;
1907 Ext2CheckSetBlock(IrpContext, Vcb, ext4_block_bitmap(&Vcb->sb, gd));
1908 Ext2CheckSetBlock(IrpContext, Vcb, ext4_inode_bitmap(&Vcb->sb, gd));
1909
1910
1911 if (i == Vcb->sbi.s_groups_count - 1) {
1912 InodeBlocks = ((INODES_COUNT % INODES_PER_GROUP) *
1913 Vcb->InodeSize + Vcb->BlockSize - 1) /
1914 (Vcb->BlockSize);
1915 } else {
1916 InodeBlocks = (INODES_PER_GROUP * Vcb->InodeSize +
1917 Vcb->BlockSize - 1) / (Vcb->BlockSize);
1918 }
1919
1920 for (j = 0; j < InodeBlocks; j++ )
1921 Ext2CheckSetBlock(IrpContext, Vcb, ext4_inode_table(&Vcb->sb, gd) + j);
1922
1923 fini_bh(&bh);
1924 }
1925
1926 return TRUE;
1927 }
1928
1929 /* Ext2Global->Resource should be already acquired */
1930 VOID
1931 Ext2InsertVcb(PEXT2_VCB Vcb)
1932 {
1933 InsertTailList(&(Ext2Global->VcbList), &Vcb->Next);
1934 }
1935
1936
1937 /* Ext2Global->Resource should be already acquired */
1938 VOID
1939 Ext2RemoveVcb(PEXT2_VCB Vcb)
1940 {
1941 RemoveEntryList(&Vcb->Next);
1942 InitializeListHead(&Vcb->Next);
1943 }
1944
1945 NTSTATUS
1946 Ext2QueryVolumeParams(IN PEXT2_VCB Vcb, IN PUNICODE_STRING Params)
1947 {
1948 NTSTATUS Status;
1949 RTL_QUERY_REGISTRY_TABLE QueryTable[2];
1950
1951 UNICODE_STRING UniName;
1952 PUSHORT UniBuffer = NULL;
1953
1954 USHORT UUID[50];
1955
1956 int i;
1957 int len = 0;
1958
1959 /* zero params */
1960 RtlZeroMemory(Params, sizeof(UNICODE_STRING));
1961
1962 /* constructing volume UUID name */
1963 memset(UUID, 0, sizeof(USHORT) * 50);
1964 for (i=0; i < 16; i++) {
1965 if (i == 0) {
1966 swprintf((wchar_t *)&UUID[len], L"{%2.2X",Vcb->SuperBlock->s_uuid[i]);
1967 len += 3;
1968 } else if (i == 15) {
1969 swprintf((wchar_t *)&UUID[len], L"-%2.2X}", Vcb->SuperBlock->s_uuid[i]);
1970 len +=4;
1971 } else {
1972 swprintf((wchar_t *)&UUID[len], L"-%2.2X", Vcb->SuperBlock->s_uuid[i]);
1973 len += 3;
1974 }
1975 }
1976
1977 /* allocating memory for UniBuffer */
1978 UniBuffer = Ext2AllocatePool(PagedPool, 1024, EXT2_PARAM_MAGIC);
1979 if (NULL == UniBuffer) {
1980 Status = STATUS_INSUFFICIENT_RESOURCES;
1981 goto errorout;
1982 }
1983 RtlZeroMemory(UniBuffer, 1024);
1984
1985 /* querying volume parameter string */
1986 RtlZeroMemory(&QueryTable[0], sizeof(RTL_QUERY_REGISTRY_TABLE) * 2);
1987 QueryTable[0].Flags = RTL_QUERY_REGISTRY_DIRECT | RTL_QUERY_REGISTRY_REQUIRED;
1988 QueryTable[0].Name = UUID;
1989 QueryTable[0].EntryContext = &(UniName);
1990 UniName.MaximumLength = 1024;
1991 UniName.Length = 0;
1992 UniName.Buffer = UniBuffer;
1993
1994 Status = RtlQueryRegistryValues(
1995 RTL_REGISTRY_ABSOLUTE,
1996 Ext2Global->RegistryPath.Buffer,
1997 &QueryTable[0],
1998 NULL,
1999 NULL
2000 );
2001
2002 if (!NT_SUCCESS(Status)) {
2003 goto errorout;
2004 }
2005
2006 errorout:
2007
2008 if (NT_SUCCESS(Status)) {
2009 *Params = UniName;
2010 } else {
2011 if (UniBuffer) {
2012 Ext2FreePool(UniBuffer, EXT2_PARAM_MAGIC);
2013 }
2014 }
2015
2016 return Status;
2017 }
2018
2019 VOID
2020 Ext2ParseRegistryVolumeParams(
2021 IN PUNICODE_STRING Params,
2022 OUT PEXT2_VOLUME_PROPERTY3 Property
2023 )
2024 {
2025 WCHAR Codepage[CODEPAGE_MAXLEN];
2026 WCHAR Prefix[HIDINGPAT_LEN];
2027 WCHAR Suffix[HIDINGPAT_LEN];
2028 USHORT MountPoint[4];
2029 UCHAR DrvLetter[4];
2030 WCHAR wUID[8], wGID[8], wEUID[8], wEGID[8];
2031 CHAR sUID[8], sGID[8], sEUID[8], sEGID[8];
2032
2033 BOOLEAN bWriteSupport = FALSE,
2034 bCheckBitmap = FALSE,
2035 bCodeName = FALSE,
2036 bMountPoint = FALSE;
2037 BOOLEAN bUID = 0, bGID = 0, bEUID = 0, bEGID = 0;
2038
2039 struct {
2040 PWCHAR Name; /* parameters name */
2041 PBOOLEAN bExist; /* is it contained in params */
2042 USHORT Length; /* parameter value length */
2043 PWCHAR uValue; /* value buffer in unicode */
2044 PCHAR aValue; /* value buffer in ansi */
2045 } ParamPattern[] = {
2046 /* writing support */
2047 {READING_ONLY, &Property->bReadonly, 0, NULL, NULL},
2048 {WRITING_SUPPORT, &bWriteSupport, 0, NULL, NULL},
2049 {EXT3_FORCEWRITING, &Property->bExt3Writable, 0, NULL, NULL},
2050
2051 /* need check bitmap */
2052 {CHECKING_BITMAP, &bCheckBitmap, 0, NULL, NULL},
2053 /* codepage */
2054 {CODEPAGE_NAME, &bCodeName, CODEPAGE_MAXLEN,
2055 &Codepage[0], Property->Codepage},
2056 /* filter prefix and suffix */
2057 {HIDING_PREFIX, &Property->bHidingPrefix, HIDINGPAT_LEN,
2058 &Prefix[0], Property->sHidingPrefix},
2059 {HIDING_SUFFIX, &Property->bHidingSuffix, HIDINGPAT_LEN,
2060 &Suffix[0], Property->sHidingSuffix},
2061 {MOUNT_POINT, &bMountPoint, 4,
2062 &MountPoint[0], &DrvLetter[0]},
2063
2064 {UID, &bUID, 8, &wUID[0], &sUID[0],},
2065 {GID, &bGID, 8, &wGID[0], &sGID[0]},
2066 {EUID, &bEUID, 8, &wEUID[0], &sEUID[0]},
2067 {EGID, &bEGID, 8, &wEGID[0], &sEGID[0]},
2068
2069 /* end */
2070 {NULL, NULL, 0, NULL}
2071 };
2072
2073 USHORT i, j, k;
2074
2075 RtlZeroMemory(Codepage, sizeof(WCHAR) * CODEPAGE_MAXLEN);
2076 RtlZeroMemory(Prefix, sizeof(WCHAR) * HIDINGPAT_LEN);
2077 RtlZeroMemory(Suffix, sizeof(WCHAR) * HIDINGPAT_LEN);
2078 RtlZeroMemory(MountPoint, sizeof(USHORT) * 4);
2079 RtlZeroMemory(DrvLetter, sizeof(CHAR) * 4);
2080
2081 RtlZeroMemory(Property, sizeof(EXT2_VOLUME_PROPERTY3));
2082 Property->Magic = EXT2_VOLUME_PROPERTY_MAGIC;
2083 Property->Command = APP_CMD_SET_PROPERTY3;
2084
2085 for (i=0; ParamPattern[i].Name != NULL; i++) {
2086
2087 UNICODE_STRING Name1=*Params, Name2;
2088 RtlInitUnicodeString(&Name2, ParamPattern[i].Name);
2089 *ParamPattern[i].bExist = FALSE;
2090
2091 for (j=0; j * sizeof(WCHAR) + Name2.Length <= Params->Length ; j++) {
2092
2093 Name1.MaximumLength = Params->Length - j * sizeof(WCHAR);
2094 Name1.Length = Name2.Length;
2095 Name1.Buffer = &Params->Buffer[j];
2096
2097 if (!RtlCompareUnicodeString(&Name1, &Name2, TRUE)) {
2098 if (j * sizeof(WCHAR) + Name2.Length == Params->Length ||
2099 Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L';' ||
2100 Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L',' ) {
2101 *(ParamPattern[i].bExist) = TRUE;
2102 } else if ((j * 2 + Name2.Length < Params->Length + 2) ||
2103 (Name1.Buffer[Name2.Length/sizeof(WCHAR)] == L'=' )) {
2104 j += Name2.Length/sizeof(WCHAR) + 1;
2105 k = 0;
2106 while ( j + k < Params->Length/2 &&
2107 k < ParamPattern[i].Length &&
2108 Params->Buffer[j+k] != L';' &&
2109 Params->Buffer[j+k] != L',' ) {
2110 #ifdef __REACTOS__
2111 ParamPattern[i].uValue[k] = Params->Buffer[j + k];
2112 k++;
2113 #else
2114 ParamPattern[i].uValue[k] = Params->Buffer[j + k++];
2115 #endif
2116 }
2117 if (k) {
2118 NTSTATUS status;
2119 ANSI_STRING AnsiName;
2120 AnsiName.Length = 0;
2121 AnsiName.MaximumLength =ParamPattern[i].Length;
2122 AnsiName.Buffer = ParamPattern[i].aValue;
2123
2124 Name2.Buffer = ParamPattern[i].uValue;
2125 Name2.MaximumLength = Name2.Length = k * sizeof(WCHAR);
2126 status = RtlUnicodeStringToAnsiString(
2127 &AnsiName, &Name2, FALSE);
2128 if (NT_SUCCESS(status)) {
2129 *(ParamPattern[i].bExist) = TRUE;
2130 } else {
2131 *ParamPattern[i].bExist = FALSE;
2132 }
2133 }
2134 }
2135 break;
2136 }
2137 }
2138 }
2139
2140 if (bMountPoint) {
2141 Property->DrvLetter = DrvLetter[0];
2142 Property->DrvLetter |= 0x80;
2143 }
2144
2145 if (bUID && bGID) {
2146 SetFlag(Property->Flags2, EXT2_VPROP3_USERIDS);
2147 sUID[7] = sGID[7] = sEUID[7] = sEGID[7] = 0;
2148 Property->uid = (USHORT)atoi(sUID);
2149 Property->gid = (USHORT)atoi(sGID);
2150 if (bEUID) {
2151 Property->euid = (USHORT)atoi(sEUID);
2152 Property->egid = (USHORT)atoi(sEGID);
2153 Property->EIDS = TRUE;
2154 } else {
2155 Property->EIDS = FALSE;
2156 }
2157 } else {
2158 ClearFlag(Property->Flags2, EXT2_VPROP3_USERIDS);
2159 }
2160 }
2161
2162 NTSTATUS
2163 Ext2PerformRegistryVolumeParams(IN PEXT2_VCB Vcb)
2164 {
2165 NTSTATUS Status;
2166 UNICODE_STRING VolumeParams;
2167
2168 Status = Ext2QueryVolumeParams(Vcb, &VolumeParams);
2169 if (NT_SUCCESS(Status)) {
2170
2171 /* set Vcb settings from registery */
2172 EXT2_VOLUME_PROPERTY3 Property;
2173 Ext2ParseRegistryVolumeParams(&VolumeParams, &Property);
2174 Ext2ProcessVolumeProperty(Vcb, &Property, sizeof(Property));
2175
2176 } else {
2177
2178 /* don't support auto mount */
2179 if (IsFlagOn(Ext2Global->Flags, EXT2_AUTO_MOUNT)) {
2180 Status = STATUS_SUCCESS;
2181 } else {
2182 Status = STATUS_UNSUCCESSFUL;
2183 goto errorout;
2184 }
2185
2186 /* set Vcb settings from Ext2Global */
2187 if (IsFlagOn(Ext2Global->Flags, EXT2_SUPPORT_WRITING)) {
2188 if (Vcb->IsExt3fs) {
2189 if (IsFlagOn(Ext2Global->Flags, EXT3_FORCE_WRITING)) {
2190 ClearLongFlag(Vcb->Flags, VCB_READ_ONLY);
2191 } else {
2192 SetLongFlag(Vcb->Flags, VCB_READ_ONLY);
2193 }
2194 } else {
2195 ClearLongFlag(Vcb->Flags, VCB_READ_ONLY);
2196 }
2197 } else {
2198 SetLongFlag(Vcb->Flags, VCB_READ_ONLY);
2199 }
2200
2201 /* set the default codepage */
2202 Vcb->Codepage.PageTable = Ext2Global->Codepage.PageTable;
2203 memcpy(Vcb->Codepage.AnsiName, Ext2Global->Codepage.AnsiName, CODEPAGE_MAXLEN);
2204 Vcb->Codepage.PageTable = Ext2Global->Codepage.PageTable;
2205
2206 if (Vcb->bHidingPrefix == Ext2Global->bHidingPrefix) {
2207 RtlCopyMemory( Vcb->sHidingPrefix,
2208 Ext2Global->sHidingPrefix,
2209 HIDINGPAT_LEN);
2210 } else {
2211 RtlZeroMemory( Vcb->sHidingPrefix,
2212 HIDINGPAT_LEN);
2213 }
2214
2215 if (Vcb->bHidingSuffix == Ext2Global->bHidingSuffix) {
2216 RtlCopyMemory( Vcb->sHidingSuffix,
2217 Ext2Global->sHidingSuffix,
2218 HIDINGPAT_LEN);
2219 } else {
2220 RtlZeroMemory( Vcb->sHidingSuffix,
2221 HIDINGPAT_LEN);
2222 }
2223 }
2224
2225 errorout:
2226
2227 if (VolumeParams.Buffer) {
2228 Ext2FreePool(VolumeParams.Buffer, EXT2_PARAM_MAGIC);
2229 }
2230
2231 return Status;
2232 }
2233
2234 NTSTATUS
2235 Ext2InitializeLabel(
2236 IN PEXT2_VCB Vcb,
2237 IN PEXT2_SUPER_BLOCK Sb
2238 )
2239 {
2240 NTSTATUS status;
2241
2242 USHORT Length;
2243 UNICODE_STRING Label;
2244 OEM_STRING OemName;
2245
2246 Label.MaximumLength = 16 * sizeof(WCHAR);
2247 Label.Length = 0;
2248 Label.Buffer = Vcb->Vpb->VolumeLabel;
2249 Vcb->Vpb->VolumeLabelLength = 0;
2250 RtlZeroMemory(Label.Buffer, Label.MaximumLength);
2251
2252 Length = 16;
2253 while ( (Length > 0) &&
2254 ((Sb->s_volume_name[Length -1] == 0x00) ||
2255 (Sb->s_volume_name[Length - 1] == 0x20) )
2256 ) {
2257 Length--;
2258 }
2259
2260 if (Length == 0) {
2261 return STATUS_SUCCESS;
2262 }
2263
2264 OemName.Buffer = Sb->s_volume_name;
2265 OemName.MaximumLength = 16;
2266 OemName.Length = Length;
2267
2268 status = Ext2OEMToUnicode(Vcb, &Label, &OemName);
2269 if (NT_SUCCESS(status)) {
2270 Vcb->Vpb->VolumeLabelLength = Label.Length;
2271 }
2272
2273 return status;
2274 }
2275
2276 static __inline BOOLEAN Ext2IsNullUuid (__u8 * uuid)
2277 {
2278 int i;
2279 for (i = 0; i < 16; i++) {
2280 if (uuid[i]) {
2281 break;
2282 }
2283 }
2284
2285 return (i >= 16);
2286 }
2287
2288 #define is_power_of_2(x) ((x) != 0 && (((x) & ((x) - 1)) == 0))
2289
2290 NTSTATUS
2291 Ext2InitializeVcb( IN PEXT2_IRP_CONTEXT IrpContext,
2292 IN PEXT2_VCB Vcb,
2293 IN PEXT2_SUPER_BLOCK sb,
2294 IN PDEVICE_OBJECT TargetDevice,
2295 IN PDEVICE_OBJECT VolumeDevice,
2296 IN PVPB Vpb )
2297 {
2298 NTSTATUS Status = STATUS_UNRECOGNIZED_VOLUME;
2299 ULONG IoctlSize;
2300 LONGLONG DiskSize;
2301 LONGLONG PartSize;
2302 UNICODE_STRING RootNode;
2303 USHORT Buffer[2];
2304 ULONG ChangeCount = 0, features;
2305 CC_FILE_SIZES FileSizes;
2306 int i, has_huge_files;
2307
2308 BOOLEAN VcbResourceInitialized = FALSE;
2309 BOOLEAN NotifySyncInitialized = FALSE;
2310 BOOLEAN ExtentsInitialized = FALSE;
2311 BOOLEAN InodeLookasideInitialized = FALSE;
2312 BOOLEAN GroupLoaded = FALSE;
2313
2314 _SEH2_TRY {
2315
2316 if (Vpb == NULL) {
2317 Status = STATUS_DEVICE_NOT_READY;
2318 _SEH2_LEAVE;
2319 }
2320
2321 /* Reject mounting volume if we encounter unsupported incompat features */
2322 if (FlagOn(sb->s_feature_incompat, ~EXT4_FEATURE_INCOMPAT_SUPP)) {
2323 Status = STATUS_UNRECOGNIZED_VOLUME;
2324 _SEH2_LEAVE;
2325 }
2326
2327 /* Mount the volume RO if we encounter unsupported ro_compat features */
2328 if (FlagOn(sb->s_feature_ro_compat, ~EXT4_FEATURE_RO_COMPAT_SUPP)) {
2329 SetLongFlag(Vcb->Flags, VCB_RO_COMPAT_READ_ONLY);
2330 }
2331
2332 /* Recognize the filesystem as Ext3fs if it supports journalling */
2333 if (IsFlagOn(sb->s_feature_compat, EXT4_FEATURE_COMPAT_HAS_JOURNAL)) {
2334 Vcb->IsExt3fs = TRUE;
2335 }
2336
2337 /* check block size */
2338 Vcb->BlockSize = (EXT2_MIN_BLOCK_SIZE << sb->s_log_block_size);
2339 /* we cannot handle volume with block size bigger than 64k */
2340 if (Vcb->BlockSize > EXT2_MAX_USER_BLKSIZE) {
2341 Status = STATUS_UNRECOGNIZED_VOLUME;
2342 _SEH2_LEAVE;
2343 }
2344
2345 if (Vcb->BlockSize >= PAGE_SIZE) {
2346 Vcb->IoUnitBits = PAGE_SHIFT;
2347 Vcb->IoUnitSize = PAGE_SIZE;
2348 } else {
2349 Vcb->IoUnitSize = Vcb->BlockSize;
2350 Vcb->IoUnitBits = Ext2Log2(Vcb->BlockSize);
2351 }
2352
2353 /* initialize vcb header members ... */
2354 Vcb->Header.IsFastIoPossible = FastIoIsNotPossible;
2355 Vcb->Header.Resource = &(Vcb->MainResource);
2356 Vcb->Header.PagingIoResource = &(Vcb->PagingIoResource);
2357 Vcb->OpenVolumeCount = 0;
2358 Vcb->OpenHandleCount = 0;
2359 Vcb->ReferenceCount = 0;
2360
2361 /* initialize eresources */
2362 ExInitializeResourceLite(&Vcb->MainResource);
2363 ExInitializeResourceLite(&Vcb->PagingIoResource);
2364 ExInitializeResourceLite(&Vcb->MetaInode);
2365 ExInitializeResourceLite(&Vcb->MetaBlock);
2366 ExInitializeResourceLite(&Vcb->McbLock);
2367 ExInitializeResourceLite(&Vcb->FcbLock);
2368 ExInitializeResourceLite(&Vcb->sbi.s_gd_lock);
2369 #ifndef _WIN2K_TARGET_
2370 ExInitializeFastMutex(&Vcb->Mutex);
2371 FsRtlSetupAdvancedHeader(&Vcb->Header, &Vcb->Mutex);
2372 #endif
2373 VcbResourceInitialized = TRUE;
2374
2375 /* initialize Fcb list head */
2376 InitializeListHead(&Vcb->FcbList);
2377
2378 /* initialize Mcb list head */
2379 InitializeListHead(&(Vcb->McbList));
2380
2381 /* initialize directory notify list */
2382 InitializeListHead(&Vcb->NotifyList);
2383 FsRtlNotifyInitializeSync(&Vcb->NotifySync);
2384 NotifySyncInitialized = TRUE;
2385
2386 /* superblock checking */
2387 Vcb->SuperBlock = sb;
2388
2389 /* initialize Vpb and Label */
2390 Vcb->DeviceObject = VolumeDevice;
2391 Vcb->TargetDeviceObject = TargetDevice;
2392 Vcb->Vpb = Vpb;
2393 Vcb->RealDevice = Vpb->RealDevice;
2394 Vpb->DeviceObject = VolumeDevice;
2395
2396 /* set inode size */
2397 Vcb->InodeSize = (ULONG)sb->s_inode_size;
2398 if (Vcb->InodeSize == 0) {
2399 Vcb->InodeSize = EXT2_GOOD_OLD_INODE_SIZE;
2400 }
2401
2402 /* initialize inode lookaside list */
2403 ExInitializeNPagedLookasideList(&(Vcb->InodeLookasideList),
2404 NULL, NULL, 0, Vcb->InodeSize,
2405 'SNIE', 0);
2406
2407 InodeLookasideInitialized = TRUE;
2408
2409 /* initialize label in Vpb */
2410 Status = Ext2InitializeLabel(Vcb, sb);
2411 if (!NT_SUCCESS(Status)) {
2412 DbgBreak();
2413 }
2414
2415 /* check device characteristics flags */
2416 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_REMOVABLE_MEDIA)) {
2417 SetLongFlag(Vcb->Flags, VCB_REMOVABLE_MEDIA);
2418 }
2419
2420 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_FLOPPY_DISKETTE)) {
2421 SetLongFlag(Vcb->Flags, VCB_FLOPPY_DISK);
2422 }
2423
2424 if (IsFlagOn(Vpb->RealDevice->Characteristics, FILE_READ_ONLY_DEVICE)) {
2425 SetLongFlag(Vcb->Flags, VCB_WRITE_PROTECTED);
2426 }
2427
2428 if (IsFlagOn(TargetDevice->Characteristics, FILE_READ_ONLY_DEVICE)) {
2429 SetLongFlag(Vcb->Flags, VCB_WRITE_PROTECTED);
2430 }
2431
2432 /* verify device is writable ? */
2433 if (Ext2IsMediaWriteProtected(IrpContext, TargetDevice)) {
2434 SetFlag(Vcb->Flags, VCB_WRITE_PROTECTED);
2435 }
2436
2437 /* initialize UUID and serial number */
2438 if (Ext2IsNullUuid(sb->s_uuid)) {
2439 ExUuidCreate((UUID *)sb->s_uuid);
2440 }
2441 Vpb->SerialNumber = ((ULONG*)sb->s_uuid)[0] +
2442 ((ULONG*)sb->s_uuid)[1] +
2443 ((ULONG*)sb->s_uuid)[2] +
2444 ((ULONG*)sb->s_uuid)[3];
2445
2446 /* query partition size and disk geometry parameters */
2447 DiskSize = Vcb->DiskGeometry.Cylinders.QuadPart *
2448 Vcb->DiskGeometry.TracksPerCylinder *
2449 Vcb->DiskGeometry.SectorsPerTrack *
2450 Vcb->DiskGeometry.BytesPerSector;
2451
2452 IoctlSize = sizeof(PARTITION_INFORMATION);
2453 Status = Ext2DiskIoControl(
2454 TargetDevice,
2455 IOCTL_DISK_GET_PARTITION_INFO,
2456 NULL,
2457 0,
2458 &Vcb->PartitionInformation,
2459 &IoctlSize );
2460 if (NT_SUCCESS(Status)) {
2461 PartSize = Vcb->PartitionInformation.PartitionLength.QuadPart;
2462 } else {
2463 Vcb->PartitionInformation.StartingOffset.QuadPart = 0;
2464 Vcb->PartitionInformation.PartitionLength.QuadPart = DiskSize;
2465 PartSize = DiskSize;
2466 Status = STATUS_SUCCESS;
2467 }
2468 Vcb->Header.AllocationSize.QuadPart =
2469 Vcb->Header.FileSize.QuadPart = PartSize;
2470
2471 Vcb->Header.ValidDataLength.QuadPart =
2472 Vcb->Header.FileSize.QuadPart;
2473
2474 /* verify count */
2475 IoctlSize = sizeof(ULONG);
2476 Status = Ext2DiskIoControl(
2477 TargetDevice,
2478 IOCTL_DISK_CHECK_VERIFY,
2479 NULL,
2480 0,
2481 &ChangeCount,
2482 &IoctlSize );
2483
2484 if (!NT_SUCCESS(Status)) {
2485 _SEH2_LEAVE;
2486 }
2487 Vcb->ChangeCount = ChangeCount;
2488
2489 /* create the stream object for ext2 volume */
2490 Vcb->Volume = IoCreateStreamFileObject(NULL, Vcb->Vpb->RealDevice);
2491 if (!Vcb->Volume) {
2492 Status = STATUS_UNRECOGNIZED_VOLUME;
2493 _SEH2_LEAVE;
2494 }
2495
2496 /* initialize streaming object file */
2497 Vcb->Volume->SectionObjectPointer = &(Vcb->SectionObject);
2498 Vcb->Volume->ReadAccess = TRUE;
2499 Vcb->Volume->WriteAccess = TRUE;
2500 Vcb->Volume->DeleteAccess = TRUE;
2501 Vcb->Volume->FsContext = (PVOID) Vcb;
2502 Vcb->Volume->FsContext2 = NULL;
2503 Vcb->Volume->Vpb = Vcb->Vpb;
2504
2505 FileSizes.AllocationSize.QuadPart =
2506 FileSizes.FileSize.QuadPart =
2507 FileSizes.ValidDataLength.QuadPart =
2508 Vcb->Header.AllocationSize.QuadPart;
2509
2510 CcInitializeCacheMap( Vcb->Volume,
2511 &FileSizes,
2512 TRUE,
2513 &(Ext2Global->CacheManagerNoOpCallbacks),
2514 Vcb );
2515
2516 /* initialize disk block LargetMcb and entry Mcb,
2517 it will raise an expcetion if failed */
2518 _SEH2_TRY {
2519 FsRtlInitializeLargeMcb(&(Vcb->Extents), PagedPool);
2520 } _SEH2_EXCEPT (EXCEPTION_EXECUTE_HANDLER) {
2521 Status = STATUS_INSUFFICIENT_RESOURCES;
2522 DbgBreak();
2523 } _SEH2_END;
2524 if (!NT_SUCCESS(Status)) {
2525 _SEH2_LEAVE;
2526 }
2527 ExtentsInitialized = TRUE;
2528
2529 /* set block device */
2530 Vcb->bd.bd_dev = Vcb->RealDevice;
2531 Vcb->bd.bd_geo = Vcb->DiskGeometry;
2532 Vcb->bd.bd_part = Vcb->PartitionInformation;
2533 Vcb->bd.bd_volume = Vcb->Volume;
2534 Vcb->bd.bd_priv = (void *) Vcb;
2535 memset(&Vcb->bd.bd_bh_root, 0, sizeof(struct rb_root));
2536 InitializeListHead(&Vcb->bd.bd_bh_free);
2537 ExInitializeResourceLite(&Vcb->bd.bd_bh_lock);
2538 KeInitializeEvent(&Vcb->bd.bd_bh_notify,
2539 NotificationEvent, TRUE);
2540 Vcb->bd.bd_bh_cache = kmem_cache_create("bd_bh_buffer",
2541 Vcb->BlockSize, 0, 0, NULL);
2542 if (!Vcb->bd.bd_bh_cache) {
2543 Status = STATUS_INSUFFICIENT_RESOURCES;
2544 _SEH2_LEAVE;
2545 }
2546
2547 Vcb->SectorBits = Ext2Log2(SECTOR_SIZE);
2548 Vcb->sb.s_magic = sb->s_magic;
2549 Vcb->sb.s_bdev = &Vcb->bd;
2550 Vcb->sb.s_blocksize = BLOCK_SIZE;
2551 Vcb->sb.s_blocksize_bits = BLOCK_BITS;
2552 Vcb->sb.s_priv = (void *) Vcb;
2553 Vcb->sb.s_fs_info = &Vcb->sbi;
2554
2555 Vcb->sbi.s_es = sb;
2556 Vcb->sbi.s_blocks_per_group = sb->s_blocks_per_group;
2557 Vcb->sbi.s_first_ino = sb->s_first_ino;
2558 Vcb->sbi.s_desc_size = sb->s_desc_size;
2559
2560 if (EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, EXT4_FEATURE_INCOMPAT_64BIT)) {
2561 if (Vcb->sbi.s_desc_size < EXT4_MIN_DESC_SIZE_64BIT ||
2562 Vcb->sbi.s_desc_size > EXT4_MAX_DESC_SIZE ||
2563 !is_power_of_2(Vcb->sbi.s_desc_size)) {
2564 DEBUG(DL_ERR, ("EXT4-fs: unsupported descriptor size %lu\n", Vcb->sbi.s_desc_size));
2565 Status = STATUS_DISK_CORRUPT_ERROR;
2566 _SEH2_LEAVE;
2567 }
2568 } else {
2569 Vcb->sbi.s_desc_size = EXT4_MIN_DESC_SIZE;
2570 }
2571
2572 Vcb->sbi.s_blocks_per_group = sb->s_blocks_per_group;
2573 Vcb->sbi.s_inodes_per_group = sb->s_inodes_per_group;
2574 if (EXT3_INODES_PER_GROUP(&Vcb->sb) == 0) {
2575 Status = STATUS_DISK_CORRUPT_ERROR;
2576 _SEH2_LEAVE;
2577 }
2578 Vcb->sbi.s_inodes_per_block = BLOCK_SIZE / Vcb->InodeSize;
2579 if (Vcb->sbi.s_inodes_per_block == 0) {
2580 Status = STATUS_DISK_CORRUPT_ERROR;
2581 _SEH2_LEAVE;
2582 }
2583 Vcb->sbi.s_itb_per_group = Vcb->sbi.s_inodes_per_group /
2584 Vcb->sbi.s_inodes_per_block;
2585
2586
2587 Vcb->sbi.s_desc_per_block = BLOCK_SIZE / GROUP_DESC_SIZE;
2588 Vcb->sbi.s_desc_per_block_bits = ilog2(Vcb->sbi.s_desc_per_block);
2589
2590 for (i=0; i < 4; i++) {
2591 Vcb->sbi.s_hash_seed[i] = sb->s_hash_seed[i];
2592 }
2593 Vcb->sbi.s_def_hash_version = sb->s_def_hash_version;
2594
2595 if (le32_to_cpu(sb->s_rev_level) == EXT3_GOOD_OLD_REV &&
2596 (EXT3_HAS_COMPAT_FEATURE(&Vcb->sb, ~0U) ||
2597 EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, ~0U) ||
2598 EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, ~0U))) {
2599 printk(KERN_WARNING
2600 "EXT3-fs warning: feature flags set on rev 0 fs, "
2601 "running e2fsck is recommended\n");
2602 }
2603
2604 /*
2605 * Check feature flags regardless of the revision level, since we
2606 * previously didn't change the revision level when setting the flags,
2607 * so there is a chance incompat flags are set on a rev 0 filesystem.
2608 */
2609 features = EXT3_HAS_INCOMPAT_FEATURE(&Vcb->sb, ~EXT4_FEATURE_INCOMPAT_SUPP);
2610 if (features & EXT4_FEATURE_INCOMPAT_DIRDATA) {
2611 SetLongFlag(Vcb->Flags, VCB_READ_ONLY);
2612 ClearFlag(features, EXT4_FEATURE_INCOMPAT_DIRDATA);
2613 }
2614 if (features) {
2615 printk(KERN_ERR "EXT3-fs: %s: couldn't mount because of "
2616 "unsupported optional features (%x).\n",
2617 Vcb->sb.s_id, le32_to_cpu(features));
2618 Status = STATUS_UNRECOGNIZED_VOLUME;
2619 _SEH2_LEAVE;
2620 }
2621
2622 features = EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, ~EXT4_FEATURE_RO_COMPAT_SUPP);
2623 if (features) {
2624 printk(KERN_ERR "EXT3-fs: %s: unsupported optional features in this volume: (%x).\n",
2625 Vcb->sb.s_id, le32_to_cpu(features));
2626 if (CanIWrite(Vcb)) {
2627 } else {
2628 SetLongFlag(Vcb->Flags, VCB_READ_ONLY);
2629 }
2630 }
2631
2632 has_huge_files = EXT3_HAS_RO_COMPAT_FEATURE(&Vcb->sb, EXT4_FEATURE_RO_COMPAT_HUGE_FILE);
2633
2634 Vcb->sb.s_maxbytes = ext3_max_size(BLOCK_BITS, has_huge_files);
2635 Vcb->max_bitmap_bytes = ext3_max_bitmap_size(BLOCK_BITS,
2636 has_huge_files);
2637 Vcb->max_bytes = ext3_max_size(BLOCK_BITS, has_huge_files);
2638
2639 /* calculate maximum file bocks ... */
2640 {
2641 ULONG dwData[EXT2_BLOCK_TYPES] = {EXT2_NDIR_BLOCKS, 1, 1, 1};
2642 ULONG i;
2643
2644 ASSERT(BLOCK_BITS == Ext2Log2(BLOCK_SIZE));
2645
2646 Vcb->sbi.s_groups_count = (ULONG)(ext3_blocks_count(sb) - sb->s_first_data_block +
2647 sb->s_blocks_per_group - 1) / sb->s_blocks_per_group;
2648
2649 Vcb->max_data_blocks = 0;
2650 for (i = 0; i < EXT2_BLOCK_TYPES; i++) {
2651 if (BLOCK_BITS >= 12 && i == (EXT2_BLOCK_TYPES - 1)) {
2652 dwData[i] = 0x40000000;
2653 } else {
2654 dwData[i] = dwData[i] << ((BLOCK_BITS - 2) * i);
2655 }
2656 Vcb->max_blocks_per_layer[i] = dwData[i];
2657 Vcb->max_data_blocks += Vcb->max_blocks_per_layer[i];
2658 }
2659 }
2660
2661 Vcb->sbi.s_gdb_count = (Vcb->sbi.s_groups_count + Vcb->sbi.s_desc_per_block - 1) /
2662 Vcb->sbi.s_desc_per_block;
2663 /* load all gorup desc */
2664 if (!Ext2LoadGroup(Vcb)) {
2665 Status = STATUS_UNSUCCESSFUL;
2666 _SEH2_LEAVE;
2667 }
2668 GroupLoaded = TRUE;
2669
2670 /* recovery journal since it's ext3 */
2671 if (Vcb->IsExt3fs) {
2672 Ext2RecoverJournal(IrpContext, Vcb);
2673 if (IsFlagOn(Vcb->Flags, VCB_JOURNAL_RECOVER)) {
2674 SetLongFlag(Vcb->Flags, VCB_READ_ONLY);
2675 }
2676 }
2677
2678 /* Now allocating the mcb for root ... */
2679 Buffer[0] = L'\\';
2680 Buffer[1] = 0;
2681 RootNode.Buffer = Buffer;
2682 RootNode.MaximumLength = RootNode.Length = 2;
2683 Vcb->McbTree = Ext2AllocateMcb(
2684 Vcb, &RootNode, NULL,
2685 FILE_ATTRIBUTE_DIRECTORY
2686 );
2687 if (!Vcb->McbTree) {
2688 DbgBreak();
2689 Status = STATUS_UNSUCCESSFUL;
2690 _SEH2_LEAVE;
2691 }
2692
2693 Vcb->sb.s_root = Ext2BuildEntry(Vcb, NULL, &RootNode);
2694 if (!Vcb->sb.s_root) {
2695 DbgBreak();
2696 Status = STATUS_UNSUCCESSFUL;
2697 _SEH2_LEAVE;
2698 }
2699 Vcb->sb.s_root->d_sb = &Vcb->sb;
2700 Vcb->sb.s_root->d_inode = &Vcb->McbTree->Inode;
2701 Vcb->McbTree->de = Vcb->sb.s_root;
2702
2703 /* load root inode */
2704 Vcb->McbTree->Inode.i_ino = EXT2_ROOT_INO;
2705 Vcb->McbTree->Inode.i_sb = &Vcb->sb;
2706 if (!Ext2LoadInode(Vcb, &Vcb->McbTree->Inode)) {
2707 DbgBreak();
2708 Status = STATUS_CANT_WAIT;
2709 _SEH2_LEAVE;
2710 }
2711
2712 /* initializeroot node */
2713 Vcb->McbTree->CreationTime = Ext2NtTime(Vcb->McbTree->Inode.i_ctime);
2714 Vcb->McbTree->LastAccessTime = Ext2NtTime(Vcb->McbTree->Inode.i_atime);
2715 Vcb->McbTree->LastWriteTime = Ext2NtTime(Vcb->McbTree->Inode.i_mtime);
2716 Vcb->McbTree->ChangeTime = Ext2NtTime(Vcb->McbTree->Inode.i_mtime);
2717
2718 /* check bitmap if user specifies it */
2719 if (IsFlagOn(Ext2Global->Flags, EXT2_CHECKING_BITMAP)) {
2720 Ext2CheckBitmapConsistency(IrpContext, Vcb);
2721 }
2722
2723 /* get anything doen, then refer target device */
2724 ObReferenceObject(Vcb->TargetDeviceObject);
2725
2726 /* query parameters from registry */
2727 Ext2PerformRegistryVolumeParams(Vcb);
2728
2729 SetLongFlag(Vcb->Flags, VCB_INITIALIZED);
2730
2731 } _SEH2_FINALLY {
2732
2733 if (!NT_SUCCESS(Status)) {
2734
2735 if (Vcb->McbTree) {
2736 Ext2FreeMcb(Vcb, Vcb->McbTree);
2737 }
2738
2739 if (InodeLookasideInitialized) {
2740 ExDeleteNPagedLookasideList(&(Vcb->InodeLookasideList));
2741 }
2742
2743 if (ExtentsInitialized) {
2744 if (Vcb->bd.bd_bh_cache) {
2745 if (GroupLoaded)
2746 Ext2PutGroup(Vcb);
2747 kmem_cache_destroy(Vcb->bd.bd_bh_cache);
2748 }
2749 FsRtlUninitializeLargeMcb(&(Vcb->Extents));
2750 }
2751
2752 if (Vcb->Volume) {
2753 if (Vcb->Volume->PrivateCacheMap) {
2754 Ext2SyncUninitializeCacheMap(Vcb->Volume);
2755 }
2756 ObDereferenceObject(Vcb->Volume);
2757 }
2758
2759 if (NotifySyncInitialized) {
2760 FsRtlNotifyUninitializeSync(&Vcb->NotifySync);
2761 }
2762
2763 if (VcbResourceInitialized) {
2764 ExDeleteResourceLite(&Vcb->FcbLock);
2765 ExDeleteResourceLite(&Vcb->McbLock);
2766 ExDeleteResourceLite(&Vcb->MetaInode);
2767 ExDeleteResourceLite(&Vcb->MetaBlock);
2768 ExDeleteResourceLite(&Vcb->sbi.s_gd_lock);
2769 ExDeleteResourceLite(&Vcb->MainResource);
2770 ExDeleteResourceLite(&Vcb->PagingIoResource);
2771 }
2772 }
2773 } _SEH2_END;
2774
2775 return Status;
2776 }
2777
2778
2779 VOID
2780 Ext2TearDownStream(IN PEXT2_VCB Vcb)
2781 {
2782 PFILE_OBJECT Stream = Vcb->Volume;
2783 IO_STATUS_BLOCK IoStatus;
2784
2785 ASSERT(Vcb != NULL);
2786 ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
2787 (Vcb->Identifier.Size == sizeof(EXT2_VCB)));
2788
2789 if (Stream) {
2790
2791 Vcb->Volume = NULL;
2792
2793 if (IsFlagOn(Stream->Flags, FO_FILE_MODIFIED)) {
2794 CcFlushCache(&(Vcb->SectionObject), NULL, 0, &IoStatus);
2795 ClearFlag(Stream->Flags, FO_FILE_MODIFIED);
2796 }
2797
2798 if (Stream->PrivateCacheMap) {
2799 Ext2SyncUninitializeCacheMap(Stream);
2800 }
2801
2802 ObDereferenceObject(Stream);
2803 }
2804 }
2805
2806 VOID
2807 Ext2DestroyVcb (IN PEXT2_VCB Vcb)
2808 {
2809 ASSERT(Vcb != NULL);
2810 ASSERT((Vcb->Identifier.Type == EXT2VCB) &&
2811 (Vcb->Identifier.Size == sizeof(EXT2_VCB)));
2812
2813 DEBUG(DL_FUN, ("Ext2DestroyVcb ...\n"));
2814
2815 if (Vcb->Volume) {
2816 Ext2TearDownStream(Vcb);
2817 }
2818 ASSERT(NULL == Vcb->Volume);
2819
2820 FsRtlNotifyUninitializeSync(&Vcb->NotifySync);
2821 Ext2ListExtents(&Vcb->Extents);
2822 FsRtlUninitializeLargeMcb(&(Vcb->Extents));
2823
2824 Ext2CleanupAllMcbs(Vcb);
2825
2826 Ext2DropBH(Vcb);
2827
2828 if (Vcb->bd.bd_bh_cache)
2829 kmem_cache_destroy(Vcb->bd.bd_bh_cache);
2830 ExDeleteResourceLite(&Vcb->bd.bd_bh_lock);
2831
2832 if (Vcb->SuperBlock) {
2833 Ext2FreePool(Vcb->SuperBlock, EXT2_SB_MAGIC);
2834 Vcb->SuperBlock = NULL;
2835 }
2836
2837 if (IsFlagOn(Vcb->Flags, VCB_NEW_VPB)) {
2838 ASSERT(Vcb->Vpb2 != NULL);
2839 DEBUG(DL_DBG, ("Ext2DestroyVcb: Vpb2 to be freed: %p\n", Vcb->Vpb2));
2840 ExFreePoolWithTag(Vcb->Vpb2, TAG_VPB);
2841 DEC_MEM_COUNT(PS_VPB, Vcb->Vpb2, sizeof(VPB));
2842 Vcb->Vpb2 = NULL;
2843 }
2844
2845 ObDereferenceObject(Vcb->TargetDeviceObject);
2846
2847 ExDeleteNPagedLookasideList(&(Vcb->InodeLookasideList));
2848 ExDeleteResourceLite(&Vcb->FcbLock);
2849 ExDeleteResourceLite(&Vcb->McbLock);
2850 ExDeleteResourceLite(&Vcb->MetaInode);
2851 ExDeleteResourceLite(&Vcb->MetaBlock);
2852 ExDeleteResourceLite(&Vcb->sbi.s_gd_lock);
2853 ExDeleteResourceLite(&Vcb->PagingIoResource);
2854 ExDeleteResourceLite(&Vcb->MainResource);
2855
2856 DEBUG(DL_DBG, ("Ext2DestroyVcb: DevObject=%p Vcb=%p\n", Vcb->DeviceObject, Vcb));
2857 IoDeleteDevice(Vcb->DeviceObject);
2858 DEC_MEM_COUNT(PS_VCB, Vcb->DeviceObject, sizeof(EXT2_VCB));
2859 }
2860
2861
2862 /* uninitialize cache map */
2863
2864 VOID
2865 Ext2SyncUninitializeCacheMap (
2866 IN PFILE_OBJECT FileObject
2867 )
2868 {
2869 CACHE_UNINITIALIZE_EVENT UninitializeCompleteEvent;
2870 NTSTATUS WaitStatus;
2871 LARGE_INTEGER Ext2LargeZero = {0,0};
2872
2873
2874 KeInitializeEvent( &UninitializeCompleteEvent.Event,
2875 SynchronizationEvent,
2876 FALSE);
2877
2878 CcUninitializeCacheMap( FileObject,
2879 &Ext2LargeZero,
2880 &UninitializeCompleteEvent );
2881
2882 WaitStatus = KeWaitForSingleObject( &UninitializeCompleteEvent.Event,
2883 Executive,
2884 KernelMode,
2885 FALSE,
2886 NULL);
2887
2888 ASSERT (NT_SUCCESS(WaitStatus));
2889 }
2890
2891 /* Link Mcb to tail of Vcb->McbList queue */
2892
2893 VOID
2894 Ext2LinkTailMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb)
2895 {
2896 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) {
2897 return;
2898 }
2899
2900 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE);
2901
2902 if (IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) {
2903 DEBUG(DL_RES, ( "Ext2LinkTailMcb: %wZ already linked.\n",
2904 &Mcb->FullName));
2905 } else {
2906 InsertTailList(&Vcb->McbList, &Mcb->Link);
2907 SetLongFlag(Mcb->Flags, MCB_VCB_LINK);
2908 Ext2ReferXcb(&Vcb->NumOfMcb);
2909 }
2910
2911 ExReleaseResourceLite(&Vcb->McbLock);
2912 }
2913
2914 /* Link Mcb to head of Vcb->McbList queue */
2915
2916 VOID
2917 Ext2LinkHeadMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb)
2918 {
2919 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) {
2920 return;
2921 }
2922
2923 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE);
2924
2925 if (!IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) {
2926 InsertHeadList(&Vcb->McbList, &Mcb->Link);
2927 SetLongFlag(Mcb->Flags, MCB_VCB_LINK);
2928 Ext2ReferXcb(&Vcb->NumOfMcb);
2929 } else {
2930 DEBUG(DL_RES, ( "Ext2LinkHeadMcb: %wZ already linked.\n",
2931 &Mcb->FullName));
2932 }
2933 ExReleaseResourceLite(&Vcb->McbLock);
2934 }
2935
2936 /* Unlink Mcb from Vcb->McbList queue */
2937
2938 VOID
2939 Ext2UnlinkMcb(PEXT2_VCB Vcb, PEXT2_MCB Mcb)
2940 {
2941 if (Mcb->Inode.i_ino == EXT2_ROOT_INO) {
2942 return;
2943 }
2944
2945 ExAcquireResourceExclusiveLite(&Vcb->McbLock, TRUE);
2946
2947 if (IsFlagOn(Mcb->Flags, MCB_VCB_LINK)) {
2948 RemoveEntryList(&(Mcb->Link));
2949 ClearLongFlag(Mcb->Flags, MCB_VCB_LINK);
2950 Ext2DerefXcb(&Vcb->NumOfMcb);
2951 } else {
2952 DEBUG(DL_RES, ( "Ext2UnlinkMcb: %wZ already unlinked.\n",
2953 &Mcb->FullName));
2954 }
2955 ExReleaseResourceLite(&Vcb->McbLock);
2956 }
2957
2958 /* get the first Mcb record in Vcb->McbList */
2959
2960 PEXT2_MCB
2961 Ext2FirstUnusedMcb(PEXT2_VCB Vcb, BOOLEAN Wait, ULONG Number)
2962 {
2963 PEXT2_MCB Head = NULL;
2964 PEXT2_MCB Tail = NULL;
2965 PEXT2_MCB Mcb = NULL;
2966 PLIST_ENTRY List = NULL;
2967 ULONG i = 0;
2968 LARGE_INTEGER start, now;
2969
2970 if (!ExAcquireResourceExclusiveLite(&Vcb->McbLock, Wait)) {
2971 return NULL;
2972 }
2973
2974 KeQuerySystemTime(&start);
2975
2976 while (Number--) {
2977
2978 BOOLEAN Skip = TRUE;
2979
2980 if (IsListEmpty(&Vcb->McbList)) {
2981 break;
2982 }
2983
2984 while (i++ < Vcb->NumOfMcb) {
2985
2986 KeQuerySystemTime(&now);
2987 if (now.QuadPart > start.QuadPart + (LONGLONG)10*1000*1000) {
2988 break;
2989 }
2990
2991 List = RemoveHeadList(&Vcb->McbList);
2992 Mcb = CONTAINING_RECORD(List, EXT2_MCB, Link);
2993 ASSERT(IsFlagOn(Mcb->Flags, MCB_VCB_LINK));
2994
2995 if (Mcb->Fcb == NULL && !IsMcbRoot(Mcb) &&
2996 Mcb->Refercount == 0 &&
2997 (Mcb->Child == NULL || IsMcbSymLink(Mcb))) {
2998
2999 Ext2RemoveMcb(Vcb, Mcb);
3000 ClearLongFlag(Mcb->Flags, MCB_VCB_LINK);
3001 Ext2DerefXcb(&Vcb->NumOfMcb);
3002
3003 /* attach all Mcb into a chain*/
3004 if (Head) {
3005 ASSERT(Tail != NULL);
3006 Tail->Next = Mcb;
3007 Tail = Mcb;
3008 } else {
3009 Head = Tail = Mcb;
3010 }
3011 Tail->Next = NULL;
3012 Skip = FALSE;
3013
3014 } else {
3015
3016 InsertTailList(&Vcb->McbList, &Mcb->Link);
3017 Mcb = NULL;
3018 }
3019 }
3020
3021 if (Skip)
3022 break;
3023 }
3024
3025 ExReleaseResourceLite(&Vcb->McbLock);
3026
3027 return Head;
3028 }
3029
3030
3031 /* Reaper thread to release unused Mcb blocks */
3032 VOID NTAPI
3033 Ext2McbReaperThread(
3034 PVOID Context
3035 )
3036 {
3037 PEXT2_REAPER Reaper = Context;
3038 PLIST_ENTRY List = NULL;
3039 LARGE_INTEGER Timeout;
3040
3041 PEXT2_VCB Vcb = NULL;
3042 PEXT2_MCB Mcb = NULL;
3043
3044 ULONG i, NumOfMcbs;
3045
3046 BOOLEAN GlobalAcquired = FALSE;
3047
3048 BOOLEAN DidNothing = TRUE;
3049 BOOLEAN LastState = TRUE;
3050 BOOLEAN WaitLock;
3051
3052 _SEH2_TRY {
3053
3054 Reaper->Thread = PsGetCurrentThread();
3055
3056 /* wake up DirverEntry */
3057 KeSetEvent(&Reaper->Engine, 0, FALSE);
3058
3059 /* now process looping */
3060 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) {
3061
3062 WaitLock = FALSE;
3063
3064 /* calculate how long we need wait */
3065 if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 128)) {
3066 Timeout.QuadPart = (LONGLONG)-1000*1000; /* 0.1 second */
3067 NumOfMcbs = Ext2Global->MaxDepth * 4;
3068 WaitLock = TRUE;
3069 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 32)) {
3070 Timeout.QuadPart = (LONGLONG)-1000*1000*5; /* 0.5 second */
3071 NumOfMcbs = Ext2Global->MaxDepth * 2;
3072 WaitLock = TRUE;
3073 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 8)) {
3074 Timeout.QuadPart = (LONGLONG)-1000*1000*10; /* 1 second */
3075 NumOfMcbs = Ext2Global->MaxDepth;
3076 } else if (Ext2Global->PerfStat.Current.Mcb > (((ULONG)Ext2Global->MaxDepth) * 2)) {
3077 Timeout.QuadPart = (LONGLONG)-2*1000*1000*10; /* 2 second */
3078 NumOfMcbs = Ext2Global->MaxDepth / 4;
3079 } else if (Ext2Global->PerfStat.Current.Mcb > (ULONG)Ext2Global->MaxDepth) {
3080 Timeout.QuadPart = (LONGLONG)-4*1000*1000*10; /* 4 seconds */
3081 NumOfMcbs = Ext2Global->MaxDepth / 8;
3082 } else if (DidNothing) {
3083 Timeout.QuadPart = (LONGLONG)-8*1000*1000*10; /* 8 seconds */
3084 if (LastState) {
3085 Timeout.QuadPart *= 2;
3086 }
3087 NumOfMcbs = Ext2Global->MaxDepth / 16;
3088 } else {
3089 Timeout.QuadPart = (LONGLONG)-5*1000*1000*10; /* 5 seconds */
3090 if (LastState) {
3091 Timeout.QuadPart *= 2;
3092 }
3093 NumOfMcbs = Ext2Global->MaxDepth / 32;
3094 }
3095
3096 if (NumOfMcbs == 0)
3097 NumOfMcbs = 1;
3098
3099 LastState = DidNothing;
3100
3101 /* wait until it is waken or it times out */
3102 KeWaitForSingleObject(
3103 &Reaper->Wait,
3104 Executive,
3105 KernelMode,
3106 FALSE,
3107 &Timeout
3108 );
3109
3110 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP))
3111 break;
3112
3113 DidNothing = TRUE;
3114
3115 /* acquire global exclusive lock */
3116 if (!ExAcquireResourceSharedLite(&Ext2Global->Resource, WaitLock)) {
3117 continue;
3118 }
3119 GlobalAcquired = TRUE;
3120
3121 /* search all Vcb to get unused resources freed to system */
3122 for (List = Ext2Global->VcbList.Flink;
3123 List != &(Ext2Global->VcbList);
3124 List = List->Flink ) {
3125
3126 Vcb = CONTAINING_RECORD(List, EXT2_VCB, Next);
3127
3128 Mcb = Ext2FirstUnusedMcb(Vcb, WaitLock, NumOfMcbs);
3129 while (Mcb) {
3130 PEXT2_MCB Next = Mcb->Next;
3131 DEBUG(DL_RES, ( "Ext2ReaperThread: releasing Mcb (%p): %wZ"
3132 " Total: %xh\n", Mcb, &Mcb->FullName,
3133 Ext2Global->PerfStat.Current.Mcb));
3134 Ext2FreeMcb(Vcb, Mcb);
3135 Mcb = Next;
3136 LastState = DidNothing = FALSE;
3137 }
3138 }
3139 if (DidNothing) {
3140 KeClearEvent(&Reaper->Wait);
3141 }
3142 if (GlobalAcquired) {
3143 ExReleaseResourceLite(&Ext2Global->Resource);
3144 GlobalAcquired = FALSE;
3145 }
3146 }
3147
3148 } _SEH2_FINALLY {
3149
3150 if (GlobalAcquired) {
3151 ExReleaseResourceLite(&Ext2Global->Resource);
3152 }
3153
3154 KeSetEvent(&Reaper->Engine, 0, FALSE);
3155 } _SEH2_END;
3156
3157 PsTerminateSystemThread(STATUS_SUCCESS);
3158 }
3159
3160
3161 /* get buffer heads from global Vcb BH list */
3162
3163 BOOLEAN
3164 Ext2QueryUnusedBH(PEXT2_VCB Vcb, PLIST_ENTRY head)
3165 {
3166 struct buffer_head *bh = NULL;
3167 PLIST_ENTRY next = NULL;
3168 LARGE_INTEGER start, now;
3169 BOOLEAN wake = FALSE;
3170
3171 KeQuerySystemTime(&start);
3172
3173 ExAcquireResourceExclusiveLite(&Vcb->bd.bd_bh_lock, TRUE);
3174
3175 while (!IsListEmpty(&Vcb->bd.bd_bh_free)) {
3176
3177 KeQuerySystemTime(&now);
3178 if (now.QuadPart > start.QuadPart + (LONGLONG)10*1000*1000) {
3179 break;
3180 }
3181
3182 next = RemoveHeadList(&Vcb->bd.bd_bh_free);
3183 bh = CONTAINING_RECORD(next, struct buffer_head, b_link);
3184 if (atomic_read(&bh->b_count)) {
3185 InitializeListHead(&bh->b_link);
3186 /* to be inserted by brelse */
3187 continue;
3188 }
3189
3190 if ( IsFlagOn(Vcb->Flags, VCB_BEING_DROPPED) ||
3191 (bh->b_ts_drop.QuadPart + (LONGLONG)10*1000*1000*15) > now.QuadPart ||
3192 (bh->b_ts_creat.QuadPart + (LONGLONG)10*1000*1000*180) > now.QuadPart) {
3193 InsertTailList(head, &bh->b_link);
3194 buffer_head_remove(&Vcb->bd, bh);
3195 } else {
3196 InsertHeadList(&Vcb->bd.bd_bh_free, &bh->b_link);
3197 break;
3198 }
3199 }
3200
3201 wake = IsListEmpty(&Vcb->bd.bd_bh_free);
3202 ExReleaseResourceLite(&Vcb->bd.bd_bh_lock);
3203
3204 if (wake)
3205 KeSetEvent(&Vcb->bd.bd_bh_notify, 0, FALSE);
3206
3207 return IsFlagOn(Vcb->Flags, VCB_BEING_DROPPED);
3208 }
3209
3210
3211 /* Reaper thread to release unused buffer heads */
3212 VOID NTAPI
3213 Ext2bhReaperThread(
3214 PVOID Context
3215 )
3216 {
3217 PEXT2_REAPER Reaper = Context;
3218 PEXT2_VCB Vcb = NULL;
3219 LIST_ENTRY List, *Link;
3220 LARGE_INTEGER Timeout;
3221
3222 BOOLEAN GlobalAcquired = FALSE;
3223 BOOLEAN DidNothing = FALSE;
3224 BOOLEAN NonWait = FALSE;
3225
3226 _SEH2_TRY {
3227
3228 Reaper->Thread = PsGetCurrentThread();
3229
3230 /* wake up DirverEntry */
3231 KeSetEvent(&Reaper->Engine, 0, FALSE);
3232
3233 /* now process looping */
3234 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) {
3235
3236 /* wait until it is waken or it times out */
3237 if (NonWait) {
3238 Timeout.QuadPart = (LONGLONG)-10*1000*10;
3239 NonWait = FALSE;
3240 } else if (DidNothing) {
3241 Timeout.QuadPart = Timeout.QuadPart * 2;
3242 } else {
3243 Timeout.QuadPart = (LONGLONG)-10*1000*1000*10; /* 10 seconds */
3244 }
3245 KeWaitForSingleObject(
3246 &Reaper->Wait,
3247 Executive,
3248 KernelMode,
3249 FALSE,
3250 &Timeout
3251 );
3252
3253 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP))
3254 break;
3255
3256 InitializeListHead(&List);
3257
3258 /* acquire global exclusive lock */
3259 ExAcquireResourceSharedLite(&Ext2Global->Resource, TRUE);
3260 GlobalAcquired = TRUE;
3261 /* search all Vcb to get unused resources freed to system */
3262 for (Link = Ext2Global->VcbList.Flink;
3263 Link != &(Ext2Global->VcbList);
3264 Link = Link->Flink ) {
3265
3266 Vcb = CONTAINING_RECORD(Link, EXT2_VCB, Next);
3267 NonWait = Ext2QueryUnusedBH(Vcb, &List);
3268 }
3269 DidNothing = IsListEmpty(&List);
3270 if (DidNothing) {
3271 KeClearEvent(&Reaper->Wait);
3272 }
3273 if (GlobalAcquired) {
3274 ExReleaseResourceLite(&Ext2Global->Resource);
3275 GlobalAcquired = FALSE;
3276 }
3277
3278 while (!IsListEmpty(&List)) {
3279 struct buffer_head *bh;
3280 Link = RemoveHeadList(&List);
3281 bh = CONTAINING_RECORD(Link, struct buffer_head, b_link);
3282 ASSERT(0 == atomic_read(&bh->b_count));
3283 free_buffer_head(bh);
3284 }
3285 }
3286
3287 } _SEH2_FINALLY {
3288
3289 if (GlobalAcquired) {
3290 ExReleaseResourceLite(&Ext2Global->Resource);
3291 }
3292
3293 KeSetEvent(&Reaper->Engine, 0, FALSE);
3294 } _SEH2_END;
3295
3296 PsTerminateSystemThread(STATUS_SUCCESS);
3297 }
3298
3299 /* get unused Fcbs to free */
3300
3301 BOOLEAN
3302 Ext2QueryUnusedFcb(PEXT2_VCB Vcb, PLIST_ENTRY list)
3303 {
3304 PEXT2_FCB Fcb;
3305 PLIST_ENTRY next = NULL;
3306 LARGE_INTEGER start, now;
3307
3308 ULONG count = 0;
3309 ULONG tries = 0;
3310 BOOLEAN wake = FALSE;
3311 BOOLEAN retry = TRUE;
3312
3313 KeQuerySystemTime(&start);
3314
3315 ExAcquireResourceExclusiveLite(&Vcb->FcbLock, TRUE);
3316
3317 again:
3318
3319 KeQuerySystemTime(&now);
3320 while (!IsListEmpty(&Vcb->FcbList)) {
3321
3322 next = RemoveHeadList(&Vcb->FcbList);
3323 Fcb = CONTAINING_RECORD(next, EXT2_FCB, Next);
3324
3325 if (Fcb->ReferenceCount > 0) {
3326 InsertTailList(&Vcb->FcbList, &Fcb->Next);
3327 break;
3328 }
3329
3330 retry = FALSE;
3331
3332 if (now.QuadPart < Fcb->TsDrop.QuadPart + 10*1000*1000*120) {
3333 InsertHeadList(&Vcb->FcbList, &Fcb->Next);
3334 break;
3335 }
3336
3337 Ext2UnlinkFcb(Fcb);
3338 Ext2DerefXcb(&Vcb->FcbCount);
3339 InsertTailList(list, &Fcb->Next);
3340 if (++count >= Ext2Global->MaxDepth) {
3341 break;
3342 }
3343 }
3344
3345 if (start.QuadPart + 10*1000*1000 > now.QuadPart) {
3346 retry = FALSE;
3347 }
3348
3349 if (retry) {
3350 if (++tries < (Vcb->FcbCount >> 4) )
3351 goto again;
3352 }
3353
3354 ExReleaseResourceLite(&Vcb->FcbLock);
3355
3356 return 0;
3357 }
3358
3359 /* Reaper thread to release Fcb */
3360 VOID NTAPI
3361 Ext2FcbReaperThread(
3362 PVOID Context
3363 )
3364 {
3365 PEXT2_REAPER Reaper = Context;
3366 PEXT2_VCB Vcb = NULL;
3367 LIST_ENTRY List, *Link;
3368 LARGE_INTEGER Timeout;
3369
3370 BOOLEAN GlobalAcquired = FALSE;
3371 BOOLEAN DidNothing = FALSE;
3372 BOOLEAN NonWait = FALSE;
3373
3374 _SEH2_TRY {
3375
3376 Reaper->Thread = PsGetCurrentThread();
3377
3378 /* wake up DirverEntry */
3379 KeSetEvent(&Reaper->Engine, 0, FALSE);
3380
3381 /* now process looping */
3382 while (!IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP)) {
3383
3384 /* wait until it is waken or it times out */
3385 if (NonWait) {
3386 Timeout.QuadPart = (LONGLONG)-10*1000*100;
3387 NonWait = FALSE;
3388 } else if (DidNothing) {
3389 Timeout.QuadPart = Timeout.QuadPart * 2;
3390 } else {
3391 Timeout.QuadPart = (LONGLONG)-10*1000*1000*20; /* 20 seconds */
3392 }
3393 KeWaitForSingleObject(
3394 &Reaper->Wait,
3395 Executive,
3396 KernelMode,
3397 FALSE,
3398 &Timeout
3399 );
3400
3401 if (IsFlagOn(Reaper->Flags, EXT2_REAPER_FLAG_STOP))
3402 break;
3403
3404 InitializeListHead(&List);
3405
3406 /* acquire global exclusive lock */
3407 ExAcquireResourceSharedLite(&Ext2Global->Resource, TRUE);
3408 GlobalAcquired = TRUE;
3409 /* search all Vcb to get unused resources freed to system */
3410 for (Link = Ext2Global->VcbList.Flink;
3411 Link != &(Ext2Global->VcbList);
3412 Link = Link->Flink ) {
3413
3414 Vcb = CONTAINING_RECORD(Link, EXT2_VCB, Next);
3415 NonWait = Ext2QueryUnusedFcb(Vcb, &List);
3416 }
3417 DidNothing = IsListEmpty(&List);
3418 if (DidNothing) {
3419 KeClearEvent(&Reaper->Wait);
3420 }
3421 if (GlobalAcquired) {
3422 ExReleaseResourceLite(&Ext2Global->Resource);
3423 GlobalAcquired = FALSE;
3424 }
3425
3426 while (!IsListEmpty(&List)) {
3427 PEXT2_FCB Fcb;
3428 Link = RemoveHeadList(&List);
3429 Fcb = CONTAINING_RECORD(Link, EXT2_FCB, Next);
3430 ASSERT(0 == Fcb->ReferenceCount);
3431 Ext2FreeFcb(Fcb);
3432 }
3433 }
3434
3435 } _SEH2_FINALLY {
3436
3437 if (GlobalAcquired) {
3438 ExReleaseResourceLite(&Ext2Global->Resource);
3439 }
3440
3441 KeSetEvent(&Reaper->Engine, 0, FALSE);
3442 } _SEH2_END;
3443
3444 PsTerminateSystemThread(STATUS_SUCCESS);
3445 }
3446
3447 NTSTATUS
3448 Ext2StartReaper(PEXT2_REAPER Reaper, EXT2_REAPER_RELEASE Free)
3449 {
3450 NTSTATUS status = STATUS_SUCCESS;
3451 OBJECT_ATTRIBUTES oa;
3452 HANDLE handle = 0;
3453 LARGE_INTEGER timeout;
3454
3455 Reaper->Free = Free;
3456
3457 /* initialize wait event */
3458 KeInitializeEvent(
3459 &Reaper->Wait,
3460 SynchronizationEvent, FALSE
3461 );
3462
3463 /* Reaper thread engine event */
3464 KeInitializeEvent(
3465 &Reaper->Engine,
3466 SynchronizationEvent, FALSE
3467 );
3468
3469 /* initialize oa */
3470 InitializeObjectAttributes(
3471 &oa,
3472 NULL,
3473 OBJ_CASE_INSENSITIVE |
3474 OBJ_KERNEL_HANDLE,
3475 NULL,
3476 NULL
3477 );
3478
3479 /* start a new system thread */
3480 status = PsCreateSystemThread(
3481 &handle,
3482 0,
3483 &oa,
3484 NULL,
3485 NULL,
3486 Free,
3487 (PVOID)Reaper
3488 );
3489
3490 if (NT_SUCCESS(status)) {
3491 ZwClose(handle);
3492
3493 /* make sure Reaperthread is started */
3494 timeout.QuadPart = (LONGLONG)-10*1000*1000*2; /* 2 seconds */
3495 status = KeWaitForSingleObject(
3496 &Reaper->Engine,
3497 Executive,
3498 KernelMode,
3499 FALSE,
3500 &timeout
3501 );
3502 if (status != STATUS_SUCCESS) {
3503 status = STATUS_INSUFFICIENT_RESOURCES;
3504 }
3505 }
3506
3507 return status;
3508 }
3509
3510
3511 VOID NTAPI
3512 Ext2StopReaper(PEXT2_REAPER Reaper)
3513 {
3514 LARGE_INTEGER timeout;
3515
3516 Reaper->Flags |= EXT2_REAPER_FLAG_STOP;
3517 KeSetEvent(&Reaper->Wait, 0, FALSE);
3518
3519 /* make sure Reaperthread is started */
3520 timeout.QuadPart = (LONGLONG)-10*1000*1000*2; /* 2 seconds */
3521 KeWaitForSingleObject(
3522 &Reaper->Engine,
3523 Executive,
3524 KernelMode,
3525 FALSE,
3526 &timeout);
3527 }
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