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[CDFS] Implement volume un/locking.

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CORE-13957
This commit is contained in:
Pierre Schweitzer 2017-11-04 21:29:51 +01:00
parent b30670ba43
commit 03a9d8c7ca
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GPG key ID: 7545556C3D585B0B
2 changed files with 73 additions and 0 deletions
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4
drivers/filesystems/cdfs/cdfs.h
View file

@ -153,6 +153,8 @@ typedef struct _CDINFO
} CDINFO, *PCDINFO;
#define VCB_VOLUME_LOCKED 0x0001
typedef struct
{
ERESOURCE VcbResource;
@ -165,6 +167,8 @@ typedef struct
PDEVICE_OBJECT StorageDevice;
PFILE_OBJECT StreamFileObject;
ULONG Flags;
CDINFO CdInfo;
/* Notifications */

69
drivers/filesystems/cdfs/fsctl.c
View file

@ -23,6 +23,7 @@
* PURPOSE: CDROM (ISO 9660) filesystem driver
* PROGRAMMER: Art Yerkes
* Eric Kohl
* Pierre Schweitzer
*/
/* INCLUDES *****************************************************************/
@ -549,6 +550,64 @@ CdfsVerifyVolume(
}
static
NTSTATUS
CdfsLockOrUnlockVolume(
IN PCDFS_IRP_CONTEXT IrpContext,
IN BOOLEAN LockVolume)
{
PFCB Fcb;
PVPB Vpb;
PFILE_OBJECT FileObject;
PDEVICE_EXTENSION DeviceExt;
FileObject = IrpContext->FileObject;
Fcb = FileObject->FsContext;
DeviceExt = IrpContext->DeviceObject->DeviceExtension;
Vpb = DeviceExt->StreamFileObject->Vpb;
/* Only allow locking with the volume open */
if (!BooleanFlagOn(Fcb->Flags, FCB_IS_VOLUME_STREAM))
{
return STATUS_ACCESS_DENIED;
}
/* Bail out if it's already in the demanded state */
if ((BooleanFlagOn(DeviceExt->Flags, VCB_VOLUME_LOCKED) && LockVolume) ||
(!BooleanFlagOn(DeviceExt->Flags, VCB_VOLUME_LOCKED) && !LockVolume))
{
return STATUS_ACCESS_DENIED;
}
/* Bail out if it's already in the demanded state */
if ((BooleanFlagOn(Vpb->Flags, VPB_LOCKED) && LockVolume) ||
(!BooleanFlagOn(Vpb->Flags, VPB_LOCKED) && !LockVolume))
{
return STATUS_ACCESS_DENIED;
}
/* Deny locking if we're not alone */
if (LockVolume && DeviceExt->OpenHandleCount != 1)
{
return STATUS_ACCESS_DENIED;
}
/* Finally, proceed */
if (LockVolume)
{
DeviceExt->Flags |= VCB_VOLUME_LOCKED;
Vpb->Flags |= VPB_LOCKED;
}
else
{
DeviceExt->Flags &= ~VCB_VOLUME_LOCKED;
Vpb->Flags &= ~VPB_LOCKED;
}
return STATUS_SUCCESS;
}
NTSTATUS
NTAPI
CdfsSetCompression(
@ -604,6 +663,16 @@ CdfsFileSystemControl(
Status = CdfsSetCompression(DeviceObject, Irp);
break;
case FSCTL_LOCK_VOLUME:
DPRINT("CDFS: IRP_MN_USER_FS_REQUEST / FSCTL_LOCK_VOLUME\n");
Status = CdfsLockOrUnlockVolume(IrpContext, TRUE);
break;
case FSCTL_UNLOCK_VOLUME:
DPRINT("CDFS: IRP_MN_USER_FS_REQUEST / FSCTL_UNLOCK_VOLUME\n");
Status = CdfsLockOrUnlockVolume(IrpContext, FALSE);
break;
default:
DPRINT1("CDFS: IRP_MN_USER_FS_REQUEST / Unknown IoControlCode 0x%x\n",
Stack->Parameters.DeviceIoControl.IoControlCode);