aio: be defensive to ensure request batching is non-zero instead of BUG_ON()



In the event that an overflow/underflow occurs while calculating req_batch,
clamp the minimum at 1 request instead of doing a BUG_ON().

Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>

parent db446a08

fs/aio.c

+2 −1

Original line number	Diff line number	Diff line
		@@ -576,7 +576,8 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)

		atomic_set(&ctx->reqs_available, ctx->nr_events - 1);
		ctx->req_batch = (ctx->nr_events - 1) / (num_possible_cpus() * 4);
		BUG_ON(!ctx->req_batch);
		if (ctx->req_batch < 1)
		ctx->req_batch = 1;

		err = ioctx_add_table(ctx, mm);
		if (err)