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[FASTFAT]

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- Modify the VfatHasFileSystem() so that it allows a DO_VERIFY_VOLUME override, when required
- Fix the implementation of VfatVerify() so that it actually really does the job it's supposed to do:
  - it will now use the appropriate DO for verification (lower DO and not volume DO)
  - it will properly clear the DO_VERIFY_VOLUME flag
- Introduce a hack in VfatVerify() so that in case of removal media, if FATInfo is the same, it forces a dismount

Effects of this commit:
- It properly fixes CORE-9988. That means if a FAT media changes, now FastFAT properly handles it, and does not go to a code path producing (expected!) BSODs
- The hack introduces a hacky way to make ReactOS remount FAT floppies when changed

In short, changing FAT floppy in ReactOS doesn't make it BSOD any longer.

CORE-9988

svn path=/trunk/; revision=73709
This commit is contained in:
Pierre Schweitzer 2017-02-05 17:07:31 +00:00
parent 73bb103c3c
commit 8987f5fa46
1 changed files with 19 additions and 10 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

29
reactos/drivers/filesystems/fastfat/fsctl.c
View file

@ -40,7 +40,8 @@ NTSTATUS
VfatHasFileSystem(
PDEVICE_OBJECT DeviceToMount,
PBOOLEAN RecognizedFS,
PFATINFO pFatInfo)
PFATINFO pFatInfo,
BOOLEAN Override)
{
NTSTATUS Status;
PARTITION_INFORMATION PartitionInfo;
@ -64,7 +65,7 @@ VfatHasFileSystem(
0,
&DiskGeometry,
&Size,
FALSE);
Override);
if (!NT_SUCCESS(Status))
{
DPRINT("VfatBlockDeviceIoControl failed (%x)\n", Status);
@ -82,7 +83,7 @@ VfatHasFileSystem(
0,
&PartitionInfo,
&Size,
FALSE);
Override);
if (!NT_SUCCESS(Status))
{
DPRINT("VfatBlockDeviceIoControl failed (%x)\n", Status);
@ -137,7 +138,7 @@ VfatHasFileSystem(
Offset.QuadPart = 0;
/* Try to recognize FAT12/FAT16/FAT32 partitions */
Status = VfatReadDisk(DeviceToMount, &Offset, DiskGeometry.BytesPerSector, (PUCHAR) Boot, FALSE);
Status = VfatReadDisk(DeviceToMount, &Offset, DiskGeometry.BytesPerSector, (PUCHAR) Boot, Override);
if (NT_SUCCESS(Status))
{
if (Boot->Signatur1 != 0xaa55)
@ -345,7 +346,7 @@ VfatMountDevice(
DPRINT("Mounting VFAT device...\n");
Status = VfatHasFileSystem(DeviceToMount, &RecognizedFS, &DeviceExt->FatInfo);
Status = VfatHasFileSystem(DeviceToMount, &RecognizedFS, &DeviceExt->FatInfo, FALSE);
if (!NT_SUCCESS(Status))
{
return Status;
@ -392,7 +393,7 @@ VfatMount(
DeviceToMount = IrpContext->Stack->Parameters.MountVolume.DeviceObject;
Vpb = IrpContext->Stack->Parameters.MountVolume.Vpb;
Status = VfatHasFileSystem(DeviceToMount, &RecognizedFS, &FatInfo);
Status = VfatHasFileSystem(DeviceToMount, &RecognizedFS, &FatInfo, FALSE);
if (!NT_SUCCESS(Status))
{
goto ByeBye;
@ -645,19 +646,19 @@ VfatVerify(
NTSTATUS Status = STATUS_SUCCESS;
FATINFO FatInfo;
BOOLEAN RecognizedFS;
PDEVICE_EXTENSION DeviceExt = IrpContext->DeviceExt;
PDEVICE_EXTENSION DeviceExt;
DPRINT("VfatVerify(IrpContext %p)\n", IrpContext);
DeviceToVerify = IrpContext->Stack->Parameters.VerifyVolume.DeviceObject;
Status = VfatBlockDeviceIoControl(DeviceToVerify,
DeviceExt = DeviceToVerify->DeviceExtension;
Status = VfatBlockDeviceIoControl(DeviceExt->StorageDevice,
IOCTL_DISK_CHECK_VERIFY,
NULL,
0,
NULL,
0,
TRUE);
DeviceToVerify->Flags &= ~DO_VERIFY_VOLUME;
if (!NT_SUCCESS(Status) && Status != STATUS_VERIFY_REQUIRED)
{
DPRINT("VfatBlockDeviceIoControl() failed (Status %lx)\n", Status);
@ -665,19 +666,25 @@ VfatVerify(
}
else
{
Status = VfatHasFileSystem(DeviceToVerify, &RecognizedFS, &FatInfo);
Status = VfatHasFileSystem(DeviceExt->StorageDevice, &RecognizedFS, &FatInfo, TRUE);
if (!NT_SUCCESS(Status) || RecognizedFS == FALSE)
{
Status = STATUS_WRONG_VOLUME;
}
else if (sizeof(FATINFO) == RtlCompareMemory(&FatInfo, &DeviceExt->FatInfo, sizeof(FATINFO)))
{
DPRINT1("Same volume\n");
/*
* FIXME:
* Preformatted floppy disks have very often a serial number of 0000:0000.
* We should calculate a crc sum over the sectors from the root directory as secondary volume number.
* Each write to the root directory must update this crc sum.
*/
/* HACK */
if (!FatInfo.FixedMedia)
{
Status = STATUS_WRONG_VOLUME;
}
}
else
{
@ -685,6 +692,8 @@ VfatVerify(
}
}
IrpContext->Stack->Parameters.VerifyVolume.Vpb->RealDevice->Flags &= ~DO_VERIFY_VOLUME;
return Status;
}