Does linux provide a infrastructure to notify an application before deleting a monitored file?

I wonder whether linux provide a low-level support for such a use case: When a monitored file is to be deleted, the 开发者_JAVA技巧monitor application can be notified to do something before this file is deleted from the file system.

Before teh monitored file is deleted from the file system, I hope to get a chance to free its related resouces. And I can only locate the resources as long as the file is still on disk and no matter where it moves.

Many thanks! Amanda

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There is no direct API for this, but there are a number of techniques you can use.

First, the inotify API can be used to be notified /after/ deletion. To get at the contents of the file, you could create a hard link to it in another directory - this way, when the file is 'deleted', it remains on disk (at a different path) until you're ready to finally delete it.

Alternately, you could interpose a filter using FUSE. This would let you intercept any filesystem operations you like. However, this comes at a performance hit, as all filesystem operations would be intercepted, not just deletions.