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Note
For optimal reliability and performance, use file system minifilter drivers with Filter Manager support instead of legacy file system filter drivers. To port your legacy driver to a minifilter driver, see Guidelines for Porting Legacy Filter Drivers.
The following table summarizes the IRQL and thread context requirements for legacy file system filter driver dispatch routines.
| Dispatch routine | Caller's Maximum IRQL | Caller's thread context |
|---|---|---|
| Cleanup | PASSIVE_LEVEL | Nonarbitrary |
| Close | APC_LEVEL | Arbitrary |
| Create | PASSIVE_LEVEL | Nonarbitrary |
| DeviceControl (except paging I/O) | PASSIVE_LEVEL | Nonarbitrary |
| DeviceControl (paging I/O path) | APC_LEVEL | Arbitrary |
| DirectoryControl | APC_LEVEL | Arbitrary |
| FlushBuffers | PASSIVE_LEVEL | Nonarbitrary |
| FsControl (except paging I/O) | PASSIVE_LEVEL | Nonarbitrary |
| FsControl (paging I/O path) | APC_LEVEL | Arbitrary |
| LockControl | PASSIVE_LEVEL | Nonarbitrary |
| PnP | PASSIVE_LEVEL | Arbitrary |
| QueryEa | PASSIVE_LEVEL | Nonarbitrary |
| QueryInformation | PASSIVE_LEVEL | Nonarbitrary |
| QueryQuota | PASSIVE_LEVEL | Nonarbitrary |
| QuerySecurity | PASSIVE_LEVEL | Nonarbitrary |
| QueryVolumeInfo | PASSIVE_LEVEL | Nonarbitrary |
| Read (except paging I/O) | PASSIVE_LEVEL | Nonarbitrary |
| Read (paging I/O path) | APC_LEVEL | Arbitrary |
| SetEa | PASSIVE_LEVEL | Nonarbitrary |
| SetInformation | PASSIVE_LEVEL | Nonarbitrary |
| SetQuota | PASSIVE_LEVEL | Nonarbitrary |
| SetSecurity | PASSIVE_LEVEL | Nonarbitrary |
| SetVolumeInfo | PASSIVE_LEVEL | Nonarbitrary |
| Shutdown | PASSIVE_LEVEL | Arbitrary |
| Write (except paging I/O) | PASSIVE_LEVEL | Nonarbitrary |
| Write (paging I/O path) | APC_LEVEL | Arbitrary |