FsRtlLookupPerStreamContext - NtDoc
Native API online documentation, based on the System Informer
(formerly Process Hacker) phnt
headers
// ntifs.h
void FsRtlLookupPerStreamContext(
_sc,
_oid,
_iid
);
View the official Windows Driver Kit DDI referenceNo description available.
The FsRtlLookupPerStreamContext macro retrieves a per-stream context structure for a file stream.
_scPointer to the FSRTL_ADVANCED_FCB_HEADER structure for the file stream. To get this pointer from a file object, use the FsRtlGetPerStreamContextPointer macro.
_oidPointer to a caller-allocated variable that uniquely identifies the owner of the per-stream context structure. The format of this variable is filter driver − specific. Must be non-NULL if a non-NULL value is supplied for InstanceId.
_iidPointer to a filter driver − allocated variable that can be used to distinguish among per-stream context structures created by the same filter driver. The format of this variable is filter driver − specific.
If OwnerId and InstanceId are both NULL, FsRtlLookupPerStreamContext returns the first per-stream context found.
If a non-NULL value is supplied for OwnerId and InstanceId is NULL, FsRtlLookupPerStreamContext returns the first per-stream context found whose OwnerId member matches the OwnerId parameter.
A file system filter driver calls FsRtlLookupPerStreamContext to retrieve its per-stream context structure for a file stream. The per-stream context structure contains context information that the filter driver maintains for the file stream.
Note FsRtlLookupPerStreamContext can only be used on file systems that support per-stream contexts.
To initialize a per-stream context structure, use the FsRtlInitPerStreamContext macro.
To associate an initialized per-stream context structure with a file stream, call FsRtlInsertPerStreamContext.
To remove a per-stream context structure that is associated with a file stream, call FsRtlRemovePerStreamContext.
For more information, see Tracking Per-Stream Context in a Legacy File System Filter Driver.
FsRtlGetPerStreamContextPointer
FsRtlSupportsPerStreamContexts
FsRtlTeardownPerStreamContexts