On Tue, 2012-07-24 at 14:23 +0900, sf...@users.sourceforge.net wrote: > Ben Hutchings: > > > > If there is no lock higher than mmap_sem that might be used in this way, > > > > then there is no problem and there is also no need for using the > > > > workqueue. > > > > > > ?? > > > I may be confused again. > > > Why workqueue is unnecessary? > > > > The work item runs on *some* workqueue. > > ?? > Do you mean aufs_mmap() can call ..._file() directly in such case, even > LSM tries acquiring mmap_sem?
I think it should call security_mmap_file() directly. If some LSM uses the mm context and needs to acquire mmap_sem then it will hang, but this will be an obvious failure and less bad than a quiet failure due to using the mm context of the worker thread. Ben. -- Ben Hutchings If more than one person is responsible for a bug, no one is at fault.
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