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drbd: add packet_type 27 (return_code_only) to netlink api 

In case we ever should add an other packet type,
we must not reuse 27, as that currently used for
"empty" return code only replies.
Document it as such.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Lars Ellenberg 2010-11-24 10:11:14 +01:00 committed by Philipp Reisner
parent 3e3a7766c2
commit 42ff269d10
3 changed files with 10 additions and 3 deletions
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6
drivers/block/drbd/drbd_nl.c
View File

@ -2195,7 +2195,8 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
goto fail;
}
if (nlp->packet_type >= P_nl_after_last_packet) {
if (nlp->packet_type >= P_nl_after_last_packet ||
nlp->packet_type == P_return_code_only) {
retcode = ERR_PACKET_NR;
goto fail;
}
@ -2219,7 +2220,7 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
reply->packet_type =
cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
cm->reply_body_size ? nlp->packet_type : P_return_code_only;
reply->minor = nlp->drbd_minor;
reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
/* reply->tag_list; might be modified by cm->function. */
@ -2525,6 +2526,7 @@ void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
cn_reply->flags = 0;
reply->packet_type = P_return_code_only;
reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
reply->ret_code = ret_code;

6
include/linux/drbd_nl.h
View File

@ -146,9 +146,13 @@ NL_PACKET(new_c_uuid, 26,
NL_BIT( 63, T_MANDATORY, clear_bm)
)
#ifdef NL_RESPONSE
NL_RESPONSE(return_code_only, 27)
#endif
#undef NL_PACKET
#undef NL_INTEGER
#undef NL_INT64
#undef NL_BIT
#undef NL_STRING
#undef NL_RESPONSE

1
include/linux/drbd_tag_magic.h
View File

@ -7,6 +7,7 @@
/* declare packet_type enums */
enum packet_types {
#define NL_PACKET(name, number, fields) P_ ## name = number,
#define NL_RESPONSE(name, number) P_ ## name = number,
#define NL_INTEGER(pn, pr, member)
#define NL_INT64(pn, pr, member)
#define NL_BIT(pn, pr, member)