devfs: Change typedef 'cdevpriv_dtr_t' to 'd_priv_dtor_t'

The original 'cdevpriv_dtr_t' typedef was not able to be used in a
function prototype like the other d_xxx_t typedef's, because it declared

devfs: Change typedef 'cdevpriv_dtr_t' to 'd_priv_dtor_t'

The original 'cdevpriv_dtr_t' typedef was not able to be used in a
function prototype like the other d_xxx_t typedef's, because it declared
a function *pointer* rather than a function. This makes it useless
outside the cdevpriv implementation.

Change the typedef to declare a function and rename it to
'd_priv_dtor_t', which is more consistent with other dev_ops methods,
although it's not a direct member in the dev_ops struct.

Obtained-from: FreeBSD (revision 291653)
URL: https://reviews.freebsd.org/D4340

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kernel - Fix /dev/fd/N and clean up the old dup error-code-driven path

* When opening /dev/fd/N, replicate the file pointer for descriptors
that represent vnodes instead of dup()ing. This ensures

kernel - Fix /dev/fd/N and clean up the old dup error-code-driven path

* When opening /dev/fd/N, replicate the file pointer for descriptors
that represent vnodes instead of dup()ing. This ensures that the seek
offset and other fp-related elements are not shared unexpectedly.

* Refactor the open() path to allow dev_dopen() to replace the
struct file by passing a struct file ** instead of a struct file *.
This removes old error-code-based hacks.

* This fixes the shared seek position that fexecve() was operating with
due to its use of /dev/fd/N for scripts.

Reported-by: aly

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