blkpr: add page (#12637)

* blkpr: add page

* blkpr: apply suggestions from code review

* blkpr: add release example

---------

Co-authored-by: Alejandro Cervera <96702705+tricantivu@users.noreply.github.com>

pages/linux/blkpr.md

@@ -0,0 +1,24 @@
+# blkpr
+
+> Register, reserve, release, preempt, and clear persistent reservations on a block device that supports Persistent Reservations.
+> More information: <https://manned.org/blkpr>.
+
+- Register ([c]ommand) a new reservation with a given [k]ey on a given device:
+
+`blkpr {{-c|--command}} register --key {{reservation_key}} {{path/to/device}}`
+
+- Set the [t]ype of an existing reservation to exclusive access:
+
+`blkpr -c reserve -k {{reservation_key}} {{-t|--type}} exclusive-access {{path/to/device}}`
+
+- Preempt the existing reservation with a given [K]ey and replace it with a new reservation:
+
+`blkpr -c preempt {{-K|--oldkey}} {{old_key}} --key {{new_key}} -t write-exclusive {{path/to/device}}`
+
+- Release a reservation with a given [k]ey and [t]ype on a given device:
+
+`blkpr -c release --key {{reservation_key}} -t {{reservation_type}} {{path/to/device}}`
+
+- Clear all reservations from a given device:
+
+`blkpr -c clear -k {{key}} {{path/to/device}}`