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nbd: add a flag to destroy an nbd device on disconnect

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For ease of management it would be nice for users to specify that the
device node for a nbd device is destroyed once it is disconnected and
there are no more users.  Add a client flag and enable this operation to
happen.

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 17:02:07 -04:00
committed by Jens Axboe
parent c6a4759ea0
commit a2c97909f9
2 changed files with 35 additions and 1 deletions
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6
include/uapi/linux/nbd.h
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@@ -37,7 +37,7 @@ enum {
NBD_CMD_TRIM = 4
};
/* values for flags field */
/* values for flags field, these are server interaction specific. */
#define NBD_FLAG_HAS_FLAGS (1 << 0) /* nbd-server supports flags */
#define NBD_FLAG_READ_ONLY (1 << 1) /* device is read-only */
#define NBD_FLAG_SEND_FLUSH (1 << 2) /* can flush writeback cache */
@@ -45,6 +45,10 @@ enum {
#define NBD_FLAG_SEND_TRIM (1 << 5) /* send trim/discard */
#define NBD_FLAG_CAN_MULTI_CONN (1 << 8) /* Server supports multiple connections per export. */
/* These are client behavior specific flags. */
#define NBD_CFLAG_DESTROY_ON_DISCONNECT (1 << 0) /* delete the nbd device on
disconnect. */
/* userspace doesn't need the nbd_device structure */
/* These are sent over the network in the request/reply magic fields */