[Bug 224037] Kernel crashes when trying to mount certain USB keys reported as WriteProtected

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=224037

--- Comment #23 from Andriy Gapon <avg at FreeBSD.org> ---
(In reply to Scott Long from comment #22)

Scott,

I envisioned that g_disk_access would act on the WP bit and I am not sure if
using d_getattr there would be really convenient as it requires setting up a
bio, etc.
On the other hand, I think that it would be nice to expose the write-protect
status via a GEOM attribute for other uses.

Another question is whether it should scsi_da code that queries the WP bit or
whether it should be scsi_xpt.  Right now dagetattr is short-circuited to
xpt_getattr.  But it doesn't have to be, of course.

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