| UID | title | description | old-location | tech.root | ms.date | keywords | ms.keywords | req.header | req.include-header | req.target-type | req.target-min-winverclnt | req.target-min-winversvr | req.kmdf-ver | req.umdf-ver | req.ddi-compliance | req.unicode-ansi | req.idl | req.max-support | req.namespace | req.assembly | req.type-library | req.lib | req.dll | req.irql | targetos | req.typenames | f1_keywords | topic_type | api_type | api_location | api_name | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
NF:ntifs.FsRtlLookupPerFileContext |
FsRtlLookupPerFileContext function (ntifs.h) |
The FsRtlLookupPerFileContext routine returns a pointer to a FSRTL_PER_FILE_CONTEXT object that is associated with a specified file. |
ifsk\fsrtllookupperfilecontext.htm |
ifsk |
04/16/2018 |
|
FsRtlLookupPerFileContext, FsRtlLookupPerFileContext routine [Installable File System Drivers], fsrtlref_ab859bb7-ea43-4d55-ab37-feebddd270ff.xml, ifsk.fsrtllookupperfilecontext, ntifs/FsRtlLookupPerFileContext |
ntifs.h |
FltKernel.h, Ntifs.h |
Universal |
Windows Vista |
NtosKrnl.lib |
NtosKrnl.exe |
<= APC_LEVEL |
Windows |
|
|
|
|
|
The FsRtlLookupPerFileContext routine returns a pointer to a FSRTL_PER_FILE_CONTEXT object that is associated with a specified file.
A pointer to an opaque pointer that is used by the file system runtime library (FSRTL) package to track file contexts. To retrieve this pointer from a file object, use the FsRtlGetPerFileContextPointer macro.
A pointer to a filter driver-allocated variable that uniquely identifies the owner of the per-file context structure. The format of this variable is filter driver-specific. This parameter is optional, but must be non-NULL if InstanceId is non-NULL.
A pointer to a filter driver-allocated variable that can be used to distinguish among per-file context structures that are created by the same filter driver. The format of this variable is filter driver-specific. This parameter is optional.
A pointer to the first FSRTL_PER_FILE_CONTEXT structure that matches the OwnerId and InstanceId, if specified, or NULL if no match is found or the file system does not support per-file contexts.
By not specifying OwnerID and InstanceId, a filter driver can search for the first context that is associated with a file.
If the file system does not support per-file context objects, NULL is returned. Use the FsRtlSupportsPerFileContexts macro to determine whether a file system supports per-file context objects.
Tracking Per-File Context in a Legacy File System Filter Driver