[fireball] 43202: [fastfat_new] - Fix wrong comment in FatiCreate, spotted by Ged Murphy. - Add some parameters validation to FatiCreate, and a check for volume open request. - Add node types and a decoding routine. - Implement VCB locking/unlocking.
28 Sep
2009
28 Sep
'09
10:43 a.m.
Author: fireball
Date: Mon Sep 28 12:43:27 2009
New Revision: 43202
URL: http://svn.reactos.org/svn/reactos?rev=43202&view=rev
Log:
[fastfat_new]
- Fix wrong comment in FatiCreate, spotted by Ged Murphy.
- Add some parameters validation to FatiCreate, and a check for volume open request.
- Add node types and a decoding routine.
- Implement VCB locking/unlocking.
Modified:
trunk/reactos/drivers/filesystems/fastfat_new/create.c
trunk/reactos/drivers/filesystems/fastfat_new/fastfat.c
trunk/reactos/drivers/filesystems/fastfat_new/fastfat.h
trunk/reactos/drivers/filesystems/fastfat_new/fat.c
trunk/reactos/drivers/filesystems/fastfat_new/fatstruc.h
Modified: trunk/reactos/drivers/filesystems/fastfat_new/create.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/create.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/create.c [iso-8859-1] Mon Sep 28
12:43:27 2009
@@ -33,7 +33,9 @@
ULONG CreateDisposition;
/* Control blocks */
- PVCB Vcb;
+ PVCB Vcb, DecodedVcb;
+ PFCB Fcb;
+ PCCB Ccb;
/* IRP data */
PFILE_OBJECT FileObject;
@@ -48,8 +50,8 @@
ULONG EaLength;
/* Misc */
- //NTSTATUS Status;
- IO_STATUS_BLOCK Iosb;
+ NTSTATUS Status;
+ //IO_STATUS_BLOCK Iosb;
PIO_STACK_LOCATION IrpSp;
/* Get current IRP stack location */
@@ -75,14 +77,14 @@
(IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
(IrpSp->FileObject->FileName.Buffer[0] == L'\\'))
{
- /* Remove two leading slashes */
+ /* Remove a leading slash */
IrpSp->FileObject->FileName.Length -= sizeof(WCHAR);
-
RtlMoveMemory(&IrpSp->FileObject->FileName.Buffer[0],
&IrpSp->FileObject->FileName.Buffer[1],
IrpSp->FileObject->FileName.Length );
- /* If there are two leading slashes again, exit */
+ /* Check again: if there are still two leading slashes,
+ exit with an error */
if ((IrpSp->FileObject->FileName.Length > sizeof(WCHAR)) &&
(IrpSp->FileObject->FileName.Buffer[1] == L'\\') &&
(IrpSp->FileObject->FileName.Buffer[0] == L'\\'))
@@ -146,6 +148,55 @@
((CreateDisposition == FILE_OPEN) ||
(CreateDisposition == FILE_OPEN_IF)));
+ /* Validate parameters: directory/nondirectory mismatch and
+ AllocationSize being more than 4GB */
+ if ((DirectoryFile && NonDirectoryFile) ||
+ Irp->Overlay.AllocationSize.HighPart != 0)
+ {
+ FatCompleteRequest(IrpContext, Irp, STATUS_INVALID_PARAMETER);
+
+ DPRINT1("FatiCreate: STATUS_INVALID_PARAMETER\n", 0);
+ return STATUS_INVALID_PARAMETER;
+ }
+
+ /* Acquire the VCB lock exclusively */
+ if (!FatAcquireExclusiveVcb(IrpContext, Vcb))
+ {
+ // TODO: Postpone the IRP for later processing
+ ASSERT(FALSE);
+ return STATUS_NOT_IMPLEMENTED;
+ }
+
+ // TODO: Verify the VCB
+
+ /* If VCB is locked, then no file openings are possible */
+ if (Vcb->State & VCB_STATE_FLAG_LOCKED)
+ {
+ DPRINT1("This volume is locked\n");
+ Status = STATUS_ACCESS_DENIED;
+
+ /* Cleanup and return */
+ FatReleaseVcb(IrpContext, Vcb);
+ return Status;
+ }
+
+ // TODO: Check if the volume is write protected and disallow DELETE_ON_CLOSE
+
+ // TODO: Make sure EAs aren't supported on FAT32
+
+ if (FileName.Length == 0)
+ {
+ /* It is a volume open request, check related FO to be sure */
+
+ if (!RelatedFO ||
+ FatDecodeFileObject(RelatedFO, &DecodedVcb, &Fcb, &Ccb) ==
UserVolumeOpen)
+ {
+ /* It is indeed a volume open request */
+ DPRINT1("Volume open request, not implemented now!\n");
+ UNIMPLEMENTED;
+ }
+ }
+
//return Iosb.Status;
return STATUS_SUCCESS;
}
Modified: trunk/reactos/drivers/filesystems/fastfat_new/fastfat.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/fastfat.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/fastfat.c [iso-8859-1] Mon Sep 28
12:43:27 2009
@@ -271,4 +271,99 @@
ExQueueWorkItem(&IrpContext->WorkQueueItem,
DelayedWorkQueue);
}
+
+TYPE_OF_OPEN
+NTAPI
+FatDecodeFileObject(IN PFILE_OBJECT FileObject,
+ OUT PVCB *Vcb,
+ OUT PFCB *FcbOrDcb,
+ OUT PCCB *Ccb)
+{
+ TYPE_OF_OPEN TypeOfOpen = UnopenedFileObject;
+ PVOID FsContext = FileObject->FsContext;
+ PVOID FsContext2 = FileObject->FsContext2;
+
+ /* If FsContext is NULL, then everything is NULL */
+ if (!FsContext)
+ {
+ *Ccb = NULL;
+ *FcbOrDcb = NULL;
+ *Vcb = NULL;
+
+ return TypeOfOpen;
+ }
+
+ /* CCB is always stored in FsContext2 */
+ *Ccb = FsContext2;
+
+ /* Switch according to the NodeType */
+ switch (FatNodeType(FsContext))
+ {
+ /* Volume */
+ case FAT_NTC_VCB:
+ *FcbOrDcb = NULL;
+ *Vcb = FsContext;
+
+ TypeOfOpen = ( *Ccb == NULL ? VirtualVolumeFile : UserVolumeOpen );
+
+ break;
+
+ /* Root or normal directory*/
+ case FAT_NTC_ROOT_DCB:
+ case FAT_NTC_DCB:
+ *FcbOrDcb = FsContext;
+ *Vcb = (*FcbOrDcb)->Vcb;
+
+ TypeOfOpen = (*Ccb == NULL ? DirectoryFile : UserDirectoryOpen);
+
+ DPRINT1("Referencing a directory: %Z\n",
&(*FcbOrDcb)->FullFileName);
+ break;
+
+ /* File */
+ case FAT_NTC_FCB:
+ *FcbOrDcb = FsContext;
+ *Vcb = (*FcbOrDcb)->Vcb;
+
+ TypeOfOpen = (*Ccb == NULL ? EaFile : UserFileOpen);
+
+ DPRINT1("Referencing a file: %Z\n",
&(*FcbOrDcb)->FullFileName);
+
+ break;
+
+ default:
+ DPRINT1("Unknown node type %x\n", FatNodeType(FsContext));
+ ASSERT(FALSE);
+ }
+
+ return TypeOfOpen;
+}
+
+
+BOOLEAN
+NTAPI
+FatAcquireExclusiveVcb(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PVCB Vcb)
+{
+ /* Acquire VCB's resource if possible */
+ if (ExAcquireResourceExclusiveLite(&Vcb->Resource,
+ BooleanFlagOn(IrpContext->Flags,
IRPCONTEXT_CANWAIT)))
+ {
+ return TRUE;
+ }
+ else
+ {
+ return FALSE;
+ }
+}
+
+VOID
+NTAPI
+FatReleaseVcb(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PVCB Vcb)
+{
+ /* Release VCB's resource */
+ ExReleaseResourceLite(&Vcb->Resource);
+}
+
+
/* EOF */
Modified: trunk/reactos/drivers/filesystems/fastfat_new/fastfat.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/fastfat.h [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/fastfat.h [iso-8859-1] Mon Sep 28
12:43:27 2009
@@ -132,6 +132,20 @@
PIRP Irp OPTIONAL,
NTSTATUS Status);
+BOOLEAN NTAPI
+FatAcquireExclusiveVcb(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PVCB Vcb);
+
+VOID NTAPI
+FatReleaseVcb(IN PFAT_IRP_CONTEXT IrpContext,
+ IN PVCB Vcb);
+
+TYPE_OF_OPEN
+NTAPI
+FatDecodeFileObject(IN PFILE_OBJECT FileObject,
+ OUT PVCB *Vcb,
+ OUT PFCB *FcbOrDcb,
+ OUT PCCB *Ccb);
/* --------------------------------------------------------- lock.c */
Modified: trunk/reactos/drivers/filesystems/fastfat_new/fat.c
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/fat.c [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/fat.c [iso-8859-1] Mon Sep 28 12:43:27
2009
@@ -489,6 +489,12 @@
Vcb->Header.ValidDataLength.HighPart = MAXLONG;
Vcb->Header.ValidDataLength.LowPart = MAXULONG;
+ /* Set VCB to a good condition */
+ Vcb->Condition = VcbGood;
+
+ /* Initialize VCB's resource */
+ ExInitializeResourceLite(&Vcb->Resource);
+
/* Initialize CC */
CcInitializeCacheMap(Vcb->StreamFileObject,
(PCC_FILE_SIZES)&Vcb->Header.AllocationSize,
Modified: trunk/reactos/drivers/filesystems/fastfat_new/fatstruc.h
URL:
http://svn.reactos.org/svn/reactos/trunk/reactos/drivers/filesystems/fastfa…
==============================================================================
--- trunk/reactos/drivers/filesystems/fastfat_new/fatstruc.h [iso-8859-1] (original)
+++ trunk/reactos/drivers/filesystems/fastfat_new/fatstruc.h [iso-8859-1] Mon Sep 28
12:43:27 2009
@@ -7,6 +7,18 @@
typedef PVOID PBCB;
typedef NTSTATUS (*PFAT_OPERATION_HANDLER) (PFAT_IRP_CONTEXT);
+
+/* Node type stuff */
+typedef CSHORT FAT_NODE_TYPE;
+typedef FAT_NODE_TYPE *PFAT_NODE_TYPE;
+
+#define FatNodeType(Ptr) (*((PFAT_NODE_TYPE)(Ptr)))
+
+/* Node type codes */
+#define FAT_NTC_VCB (CSHORT) '00VF'
+#define FAT_NTC_FCB (CSHORT) 'CF'
+#define FAT_NTC_DCB (CSHORT) 'DF'
+#define FAT_NTC_ROOT_DCB (CSHORT) 'RFD'
typedef struct _FAT_GLOBAL_DATA
{
@@ -116,7 +128,14 @@
PFAT_SETFAT_VALUE_RUN_ROUTINE SetValueRun;
} FAT_METHODS, *PFAT_METHODS;
-#define FAT_NTC_VCB (USHORT) '00VF'
+#define VCB_STATE_FLAG_LOCKED 0x01
+
+typedef enum _VCB_CONDITION
+{
+ VcbGood,
+ VcbNotMounted,
+ VcbBad
+} VCB_CONDITION;
/* Volume Control Block */
typedef struct _VCB
@@ -129,6 +148,9 @@
PDEVICE_OBJECT TargetDeviceObject;
LIST_ENTRY VcbLinks;
PVPB Vpb;
+ ULONG State;
+ VCB_CONDITION Condition;
+ ERESOURCE Resource;
/* Notifications support */
PNOTIFY_SYNC NotifySync;
@@ -196,9 +218,6 @@
UCHAR Type;
} FCB_NAME_LINK, *PFCB_NAME_LINK;
-#define FAT_NTC_FCB (USHORT) 'CF'
-#define FAT_NTC_DCB (USHORT) 'DF'
-
typedef struct _FCB
{
FSRTL_ADVANCED_FCB_HEADER Header;
@@ -225,6 +244,8 @@
FCB_NAME_LINK FileName[0x2];
/* Buffer for the short name */
WCHAR ShortNameBuffer[0xc];
+ /* Full file name */
+ UNICODE_STRING FullFileName;
/* File basic info */
FILE_BASIC_INFORMATION BasicInfo;
union
@@ -285,6 +306,16 @@
UCHAR Flags;
} CCB, *PCCB;
+typedef enum _TYPE_OF_OPEN
+{
+ UnopenedFileObject,
+ UserFileOpen,
+ UserDirectoryOpen,
+ UserVolumeOpen,
+ VirtualVolumeFile,
+ DirectoryFile,
+ EaFile
+} TYPE_OF_OPEN;
#define CCB_SEARCH_RETURN_SINGLE_ENTRY 0x01
#define CCB_SEARCH_PATTERN_LEGAL_8DOT3 0x02
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