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aio: io_getevents() should return if io_destroy() is invoked
This patch wakes up a thread waiting in io_getevents if another thread destroys the context. This was tested using a small program that spawns a thread to wait in io_getevents while the parent thread destroys the io context and then waits for the getevents thread to exit. Without this patch, the program hangs indefinitely. With the patch, the program exits as expected. Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Cc: Zach Brown <zach.brown@oracle.com> Cc: Christopher Smith <x@xman.org> Cc: Benjamin LaHaise <bcrl@kvack.org> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
180c06efce
commit
e92adcba26
12
fs/aio.c
12
fs/aio.c
@ -1166,7 +1166,10 @@ retry:
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break;
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if (min_nr <= i)
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break;
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ret = 0;
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if (unlikely(ctx->dead)) {
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ret = -EINVAL;
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break;
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}
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if (to.timed_out) /* Only check after read evt */
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break;
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/* Try to only show up in io wait if there are ops
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@ -1231,6 +1234,13 @@ static void io_destroy(struct kioctx *ioctx)
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aio_cancel_all(ioctx);
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wait_for_all_aios(ioctx);
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/*
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* Wake up any waiters. The setting of ctx->dead must be seen
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* by other CPUs at this point. Right now, we rely on the
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* locking done by the above calls to ensure this consistency.
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*/
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wake_up(&ioctx->wait);
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put_ioctx(ioctx); /* once for the lookup */
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}
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