- File driver filter open file zip file#
- File driver filter open file drivers#
- File driver filter open file windows#
The filter manager can adjust an existing frame or create a new frame to allow minifilter drivers to attach at the correct location. From the perspective of a legacy filter driver, each filter manager frame is just another legacy filter driver.Įach filter manager frame represents a range of altitudes. Each of the filter manager's filter device objects is called a frame. When the filter manager receives the I/O request for completion, it calls each minifilter driver's postoperation callback routines in reverse order, from lowest to highest (C, B, A).įor interoperability with legacy filter drivers, the filter manager can attach filter device objects to a file system I/O stack in more than one location.
When that callback routine returns, the filter manager calls the appropriate callback routine for the next minifilter driver that registered for the operation.įor example, assuming all three minifilter drivers in the above figure registered for the same I/O operation, the filter manager would call their preoperation callback routines in order of altitude from highest to lowest (A, B, C), then forward the I/O request to the next-lower driver for further processing. When handling an I/O operation, the filter manager calls the appropriate callback routine for each minifilter driver that registered for that operation. For each of the I/O operations it chooses to filter, a minifilter driver can register a preoperation callback routine, a postoperation callback routine, or both. Altitudes are allocated and managed by Microsoft.Ī minifilter driver can filter IRP-based I/O operations as well as fast I/O and file system filter (FSFilter) callback operations. The attachment of a minifilter driver at a particular altitude on a particular volume is called an instance of the minifilter driver.Ī minifilter driver's altitude ensures that the instance of the minifilter driver is always loaded at the appropriate location relative to other minifilter driver instances, and it determines the order in which the filter manager calls the minifilter driver to handle I/O. However, the order of attachment is determined by a unique identifier called an altitude. Like legacy filter drivers, minifilter drivers attach in a particular order. Each load order group has a corresponding system-defined class and class GUID used in the INF file for the filter driver. Therefore, filter drivers in the FSFilter Anti-Virus load order group are loaded before filter drivers in the FSFilter Replication group. For example, an antivirus filter driver should be higher in the stack than a replication filter driver, so it can detect viruses and disinfect files before they are replicated to remote servers. A minifilter driver attaches to the file system stack indirectly, by registering with the filter manager for the I/O operations the minifilter driver chooses to filter.Ī legacy filter driver's position in the file system I/O stack relative to other filter drivers is determined at system startup by its load order group. The filter manager attaches to the file system stack for a target volume. The filter manager is installed with Windows, but it becomes active only when a minifilter driver is loaded. Typical applications for file system filter drivers include antivirus utilities, encryption programs, and hierarchical storage management systems. Depending on the nature of the driver, filter can mean log, observe, modify, or even prevent.
File driver filter open file windows#
A file system filter driver is a kernel-mode component that runs as part of the Microsoft Windows NT executive.Ī file system filter driver can filter I/O operations for one or more file systems or file system volumes.
File driver filter open file zip file#
Download EaseFilter Filter Driver SDK Setup Fileĭownload EaseFilter Filter Driver SDK Zip File Understand EaseFilter Filter Driver SDK ProgrammingĪ file system filter driver is an optional driver that adds value to or modifies the behavior of a file system.
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