015fcf13c4
describe how to set nr_poll_queues and enable the polling Signed-off-by: Gioh Kim <gi-oh.kim@ionos.com> Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com> Link: https://lore.kernel.org/r/20210419073722.15351-15-gi-oh.kim@ionos.com Signed-off-by: Jens Axboe <axboe@kernel.dk>
2.7 KiB
What: /sys/block/rnbd/rnbd/unmap_device Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: To unmap a volume, "normal" or "force" has to be written to: /sys/block/rnbd/rnbd/unmap_device
When "normal" is used, the operation will fail with EBUSY if any process
is using the device. When "force" is used, the device is also unmapped
when device is in use. All I/Os that are in progress will fail.
Example::
# echo "normal" > /sys/block/rnbd0/rnbd/unmap_device
What: /sys/block/rnbd/rnbd/state Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: The file contains the current state of the block device. The state file returns "open" when the device is successfully mapped from the server and accepting I/O requests. When the connection to the server gets disconnected in case of an error (e.g. link failure), the state file returns "closed" and all I/O requests submitted to it will fail with -EIO.
What: /sys/block/rnbd/rnbd/session Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: RNBD uses RTRS session to transport the data between client and server. The entry "session" contains the name of the session, that was used to establish the RTRS session. It's the same name that was passed as server parameter to the map_device entry.
What: /sys/block/rnbd/rnbd/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 path that was passed as "device_path" to the map_device operation.
What: /sys/block/rnbd/rnbd/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.
What: /sys/block/rnbd/rnbd/resize Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: Write the number of sectors to change the size of the disk.
What: /sys/block/rnbd/rnbd/remap_device Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: Remap the disconnected device if the session is not destroyed yet.
What: /sys/block/rnbd/rnbd/nr_poll_queues Date: Feb 2020 KernelVersion: 5.7 Contact: Jack Wang jinpu.wang@cloud.ionos.com Danil Kipnis danil.kipnis@cloud.ionos.com Description: Contains the number of poll-mode queues