Real-time access of opportunistically locked files without breaking opportunistic locks

摘要

Opportunistically locked files are accessed in real-time from a kernel mode file system filter driver without breaking opportunistic locks. A file system is monitored, and the granting of an opportunistic lock to a specific file object referring to a specific underlying file is detected. The granting of the detected opportunistic lock results in both the file object and the underlying file being opportunistically locked. A reference to the opportunistically locked file object is cached. The file system filter driver filters a request to access the opportunistically locked file via a second file object which is not opportunistically locked. The kernel mode file system filter driver uses the cached reference to access the opportunistically locked underlying file. This enables access of the opportunistically locked file from the kernel mode file system filter driver without breaking the opportunistic lock.