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nbd: add a status netlink command

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Allow users to query the status of existing nbd devices.  Right now this
only returns whether or not the device is connected, but could be
extended in the future to include more information.

Signed-off-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Josef Bacik 2017-04-06 17:02:05 -04:00 • committed by Jens Axboe
parent 560bc4b399
commit 47d902b90a
2 changed files with 133 additions and 0 deletions
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25
include/uapi/linux/nbd-netlink.h
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@ -33,10 +33,34 @@ enum {
NBD_ATTR_CLIENT_FLAGS,
NBD_ATTR_SOCKETS,
NBD_ATTR_DEAD_CONN_TIMEOUT,
NBD_ATTR_DEVICE_LIST,
__NBD_ATTR_MAX,
};
#define NBD_ATTR_MAX (__NBD_ATTR_MAX - 1)
/*
* This is the format for multiple devices with NBD_ATTR_DEVICE_LIST
*
* [NBD_ATTR_DEVICE_LIST]
* [NBD_DEVICE_ITEM]
* [NBD_DEVICE_INDEX]
* [NBD_DEVICE_CONNECTED]
*/
enum {
NBD_DEVICE_ITEM_UNSPEC,
NBD_DEVICE_ITEM,
__NBD_DEVICE_ITEM_MAX,
};
#define NBD_DEVICE_ITEM_MAX (__NBD_DEVICE_ITEM_MAX - 1)
enum {
NBD_DEVICE_UNSPEC,
NBD_DEVICE_INDEX,
NBD_DEVICE_CONNECTED,
__NBD_DEVICE_MAX,
};
#define NBD_DEVICE_ATTR_MAX (__NBD_DEVICE_MAX - 1)
/*
* This is the format for multiple sockets with NBD_ATTR_SOCKETS
*
@ -66,6 +90,7 @@ enum {
NBD_CMD_DISCONNECT,
NBD_CMD_RECONFIGURE,
NBD_CMD_LINK_DEAD,
NBD_CMD_STATUS,
__NBD_CMD_MAX,
};
#define NBD_CMD_MAX (__NBD_CMD_MAX - 1)