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sys: IRP_MJ_CREATE

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This commit is contained in:
Bill Zissimopoulos 2015-12-05 11:31:51 -08:00
parent 0e170901c8
commit 0d49e87468
4 changed files with 46 additions and 9 deletions
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3
build/VStudio/winfsp.sln
View File

@ -4,6 +4,9 @@ Microsoft Visual Studio Solution File, Format Version 12.00
VisualStudioVersion = 14.0.23107.0
MinimumVisualStudioVersion = 10.0.40219.1
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "winfsp.dll", "winfsp_dll.vcxproj", "{4A7C0B21-9E10-4C81-92DE-1493EFCF24EB}"
ProjectSection(ProjectDependencies) = postProject
{C85C26BA-8C22-4D30-83DA-46C3548E6332} = {C85C26BA-8C22-4D30-83DA-46C3548E6332}
EndProjectSection
EndProject
Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "winfsp.sys", "winfsp_sys.vcxproj", "{C85C26BA-8C22-4D30-83DA-46C3548E6332}"
EndProject

26
src/sys/create.c
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@ -403,7 +403,7 @@ VOID FspFsvolCreateComplete(
FsContext->UserContext = Response->Rsp.Create.UserContext;
FileObject->FsContext2 = (PVOID)(UINT_PTR)Response->Rsp.Create.UserContext2;
/* following must be performed under the fsvol lock */
/* lock the file system volume device while accessing its generic table */
ExAcquireResourceExclusiveLite(&FsvolDeviceExtension->Base.Resource, TRUE);
try
{
@ -415,19 +415,34 @@ VOID FspFsvolCreateComplete(
Result = STATUS_INSUFFICIENT_RESOURCES;
else
{
/* do the share access checks */
/* share access check */
if (Inserted)
{
/*
* This is a newly created FsContext. Set its share access and
* increment its open count. There is no need to acquire the
* FsContext's Resource (because it is newly created).
*/
IoSetShareAccess(DesiredAccess, ShareAccess, FileObject,
&FsContext->ShareAccess);
FspFileContextOpen(FsContext);
}
else
{
Result = IoCheckShareAccess(DesiredAccess, ShareAccess, FileObject,
&FsContext->ShareAccess, TRUE);
/*
* This is an existing FsContext. We must acquire its Resource and
* check if there is a delete pending and the share access. Only if
* both tests succeed we increment the open count and report success.
*/
ExAcquireResourceExclusiveLite(FsContext->Header.Resource, TRUE);
if (FsContext->DeletePending)
Result = STATUS_DELETE_PENDING;
else
Result = IoCheckShareAccess(DesiredAccess, ShareAccess, FileObject,
&FsContext->ShareAccess, TRUE);
if (NT_SUCCESS(Result))
FspFileContextOpen(FsContext);
ExReleaseResourceLite(FsContext->Header.Resource);
}
}
}
@ -444,9 +459,10 @@ VOID FspFsvolCreateComplete(
FSP_RETURN();
}
/* does an FsContext with the same UserContext already exist? */
/* did an FsContext with the same UserContext already exist? */
if (!Inserted)
{
/* delete the newly created FsContext and use the existing one */
FspFileContextDelete(FileObject->FsContext);
FileObject->FsContext = FsContext;
}

25
src/sys/driver.h
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@ -363,9 +363,13 @@ typedef struct
{
FSRTL_ADVANCED_FCB_HEADER Header;
FSP_FILE_CONTEXT_NONPAGED *NonPaged;
/* interlocked access */
LONG RefCount;
/* protected by Header.Resource */
LONG OpenCount;
SHARE_ACCESS ShareAccess;
/* protected by containing fsvol lock */
BOOLEAN DeletePending;
/* read-only after creation */
UINT64 UserContext;
UNICODE_STRING FileName;
WCHAR FileNameBuf[];
@ -375,13 +379,26 @@ VOID FspFileContextDelete(FSP_FILE_CONTEXT *Context);
static inline
VOID FspFileContextOpen(FSP_FILE_CONTEXT *Context)
{
InterlockedIncrement(&Context->OpenCount);
ASSERT(0 == Context->OpenCount || ExIsResourceAcquiredExclusiveLite(Context->Header.Resource));
Context->OpenCount++;
}
static inline
VOID FspFileContextClose(FSP_FILE_CONTEXT *Context)
{
LONG Result = InterlockedDecrement(&Context->OpenCount);
if (0 == Result)
ASSERT(ExIsResourceAcquiredExclusiveLite(Context->Header.Resource));
ASSERT(0 < Context->OpenCount);
Context->OpenCount--;
}
static inline
VOID FspFileContextRetain(FSP_FILE_CONTEXT *Context)
{
InterlockedIncrement(&Context->RefCount);
}
static inline
VOID FspFileContextRelease(FSP_FILE_CONTEXT *Context)
{
LONG RefCount = InterlockedDecrement(&Context->RefCount);
if (0 == RefCount)
FspFileContextDelete(Context);
}

1
src/sys/fileobj.c
View File

@ -46,6 +46,7 @@ NTSTATUS FspFileContextCreate(ULONG ExtraSize, FSP_FILE_CONTEXT **PFsContext)
FsContext->Header.PagingIoResource = &NonPaged->PagingIoResource;
FsRtlSetupAdvancedHeader(&FsContext->Header, &NonPaged->HeaderFastMutex);
FsContext->NonPaged = NonPaged;
FsContext->RefCount = 1;
RtlInitEmptyUnicodeString(&FsContext->FileName, FsContext->FileNameBuf, (USHORT)ExtraSize);
*PFsContext = FsContext;