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Subjectlock free inotify_ioctl()?

Hello John McCutchan and Robert Love,

I have a question about inotify_ioctl().
I am investigating if a user process misses the inotify event or gets
wrong event by ioctl(fd, FIONREAD, &pending) in linux-2.6.27, and found
it doesn't acquire dev->ev_mutex lock before accessing dev->queue_size.

In SMP system, is it safe and sure too?
Is the mutex lock unnecessary?

Junjiro R. Okajima

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