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+What: /sys/class/rnbd-server
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: provide information about RNBD-server.
+
+What: /sys/class/rnbd-server/ctl/
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: When a client maps a device, a directory entry with the name of the
+ block device is created under /sys/class/rnbd-server/ctl/devices/.
+
+What: /sys/class/rnbd-server/ctl/devices/<device_name>/block_dev
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: Is a symlink to the sysfs entry of the exported device.
+
+ Example:
+ block_dev -> ../../../../class/block/ram0
+
+What: /sys/class/rnbd-server/ctl/devices/<device_name>/sessions/
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: For each client a particular device is exported to, following directory will be
+ created:
+
+ /sys/class/rnbd-server/ctl/devices/<device_name>/sessions/<session-name>/
+
+ When the device is unmapped by that client, the directory will be removed.
+
+What: /sys/class/rnbd-server/ctl/devices/<device_name>/sessions/<session-name>/read_only
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: Contains '1' if device is mapped read-only, otherwise '0'.
+
+What: /sys/class/rnbd-server/ctl/devices/<device_name>/sessions/<session-name>/mapping_path
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: Contains the relative device path provided by the user during mapping.
+
+What: /sys/class/rnbd-server/ctl/devices/<device_name>/sessions/<session-name>/access_mode
+Date: Feb 2020
+KernelVersion: 5.7
+Contact: Jack Wang <jinpu.wang@cloud.ionos.com> Danil Kipnis <danil.kipnis@cloud.ionos.com>
+Description: Contains the device access mode: ro, rw or migration.