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Re: kern/46592: lib/libc/sys/t_mmap cause kernel panic
> but it looks like the intend of the code was to set the size for both block
> char disk devices, so I'm not sure what the right thing to do here really is.
unless we want to revive checkalias, a fix would be
- use bdev_type for VBLK
- defer sd_opencnt-- logic for VBLK to somewhere later so that
it covers mmap. probably spec_inactive?
- before decrementing sd_opencnt, flush caches.
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