Is it true there are no devices with kdev_t number equal to 0 ?
I am looking over contents of lru_list and there are a lot of
buffer_head's with both b_rdev and b_rsector equal to 0.
I tried using (bh->b_dev!=B_FREE) to test whether it contains
some data but it doesn't work (probably bc B_FREE=0xffff).
Or should I use (bh->b_count) instead ?
thanks
Vladimir Dergachev
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