branches/zip: Note that b (the newly created control block for the compressed page) is not protected by block_mutex.  Before releasing buf_pool->mutex, we can simply assign b->io_fix.  After reacquiring buf_pool->mutex, we also have to acquire buf_pool->zip_mutex.
branches/zip: Note that b (the newly created control block for the
compressed page) is not protected by block_mutex.  Before releasing
buf_pool->mutex, we can simply assign b->io_fix.  After reacquiring
buf_pool->mutex, we also have to acquire buf_pool->zip_mutex.


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