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drbd: Preparing the connector interface to operator on connections 

Up to now it only operated on minor numbers. Now it can work also
on named connections.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-02-21 15:38:08 +01:00
parent 2f5cdd0b2c
commit 1aba4d7fcf
4 changed files with 94 additions and 37 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/block/drbd/drbd_int.h
View File

@ -1479,6 +1479,7 @@ extern void drbd_free_mdev(struct drbd_conf *mdev);
struct drbd_tconn *drbd_new_tconn(char *name);
extern void drbd_free_tconn(struct drbd_tconn *tconn);
struct drbd_tconn *conn_by_name(const char *name);
extern int proc_details;

15
drivers/block/drbd/drbd_main.c
View File

@ -2196,6 +2196,21 @@ static void drbd_init_workqueue(struct drbd_work_queue* wq)
INIT_LIST_HEAD(&wq->q);
}
struct drbd_tconn *conn_by_name(const char *name)
{
struct drbd_tconn *tconn;
write_lock_irq(&global_state_lock);
list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
if (!strcmp(tconn->name, name))
goto found;
}
tconn = NULL;
found:
write_unlock_irq(&global_state_lock);
return tconn;
}
struct drbd_tconn *drbd_new_tconn(char *name)
{
struct drbd_tconn *tconn;

96
drivers/block/drbd/drbd_nl.c
View File

@ -2184,42 +2184,57 @@ out:
return 0;
}
enum cn_handler_type {
CHT_MINOR,
CHT_CONN,
CHT_CTOR,
/* CHT_RES, later */
};
struct cn_handler_struct {
int (*function)(struct drbd_conf *,
struct drbd_nl_cfg_req *,
struct drbd_nl_cfg_reply *);
enum cn_handler_type type;
union {
int (*minor_based)(struct drbd_conf *,
struct drbd_nl_cfg_req *,
struct drbd_nl_cfg_reply *);
int (*conn_based)(struct drbd_tconn *,
struct drbd_nl_cfg_req *,
struct drbd_nl_cfg_reply *);
int (*constructor)(struct drbd_nl_cfg_req *,
struct drbd_nl_cfg_reply *);
};
int reply_body_size;
};
static struct cn_handler_struct cnd_table[] = {
[ P_primary ] = { &drbd_nl_primary, 0 },
[ P_secondary ] = { &drbd_nl_secondary, 0 },
[ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
[ P_detach ] = { &drbd_nl_detach, 0 },
[ P_net_conf ] = { &drbd_nl_net_conf, 0 },
[ P_disconnect ] = { &drbd_nl_disconnect, 0 },
[ P_resize ] = { &drbd_nl_resize, 0 },
[ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
[ P_invalidate ] = { &drbd_nl_invalidate, 0 },
[ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
[ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
[ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
[ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
[ P_resume_io ] = { &drbd_nl_resume_io, 0 },
[ P_outdate ] = { &drbd_nl_outdate, 0 },
[ P_get_config ] = { &drbd_nl_get_config,
[ P_primary ] = { CHT_MINOR, { &drbd_nl_primary }, 0 },
[ P_secondary ] = { CHT_MINOR, { &drbd_nl_secondary }, 0 },
[ P_disk_conf ] = { CHT_MINOR, { &drbd_nl_disk_conf }, 0 },
[ P_detach ] = { CHT_MINOR, { &drbd_nl_detach }, 0 },
[ P_net_conf ] = { CHT_MINOR, { &drbd_nl_net_conf }, 0 },
[ P_disconnect ] = { CHT_MINOR, { &drbd_nl_disconnect }, 0 },
[ P_resize ] = { CHT_MINOR, { &drbd_nl_resize }, 0 },
[ P_syncer_conf ] = { CHT_MINOR, { &drbd_nl_syncer_conf },0 },
[ P_invalidate ] = { CHT_MINOR, { &drbd_nl_invalidate }, 0 },
[ P_invalidate_peer ] = { CHT_MINOR, { &drbd_nl_invalidate_peer },0 },
[ P_pause_sync ] = { CHT_MINOR, { &drbd_nl_pause_sync }, 0 },
[ P_resume_sync ] = { CHT_MINOR, { &drbd_nl_resume_sync },0 },
[ P_suspend_io ] = { CHT_MINOR, { &drbd_nl_suspend_io }, 0 },
[ P_resume_io ] = { CHT_MINOR, { &drbd_nl_resume_io }, 0 },
[ P_outdate ] = { CHT_MINOR, { &drbd_nl_outdate }, 0 },
[ P_get_config ] = { CHT_MINOR, { &drbd_nl_get_config },
sizeof(struct syncer_conf_tag_len_struct) +
sizeof(struct disk_conf_tag_len_struct) +
sizeof(struct net_conf_tag_len_struct) },
[ P_get_state ] = { &drbd_nl_get_state,
[ P_get_state ] = { CHT_MINOR, { &drbd_nl_get_state },
sizeof(struct get_state_tag_len_struct) +
sizeof(struct sync_progress_tag_len_struct) },
[ P_get_uuids ] = { &drbd_nl_get_uuids,
[ P_get_uuids ] = { CHT_MINOR, { &drbd_nl_get_uuids },
sizeof(struct get_uuids_tag_len_struct) },
[ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
[ P_get_timeout_flag ] = { CHT_MINOR, { &drbd_nl_get_timeout_flag },
sizeof(struct get_timeout_flag_tag_len_struct)},
[ P_start_ov ] = { &drbd_nl_start_ov, 0 },
[ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
[ P_start_ov ] = { CHT_MINOR, { &drbd_nl_start_ov }, 0 },
[ P_new_c_uuid ] = { CHT_MINOR, { &drbd_nl_new_c_uuid }, 0 },
};
static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
@ -2229,6 +2244,7 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
struct cn_msg *cn_reply;
struct drbd_nl_cfg_reply *reply;
struct drbd_conf *mdev;
struct drbd_tconn *tconn;
int retcode, rr;
int reply_size = sizeof(struct cn_msg)
+ sizeof(struct drbd_nl_cfg_reply)
@ -2244,13 +2260,6 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
goto fail;
}
mdev = ensure_mdev(nlp->drbd_minor,
(nlp->flags & DRBD_NL_CREATE_DEVICE));
if (!mdev) {
retcode = ERR_MINOR_INVALID;
goto fail;
}
if (nlp->packet_type >= P_nl_after_last_packet ||
nlp->packet_type == P_return_code_only) {
retcode = ERR_PACKET_NR;
@ -2260,7 +2269,7 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
cm = cnd_table + nlp->packet_type;
/* This may happen if packet number is 0: */
if (cm->function == NULL) {
if (cm->minor_based == NULL) {
retcode = ERR_PACKET_NR;
goto fail;
}
@ -2281,7 +2290,28 @@ static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms
reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
/* reply->tag_list; might be modified by cm->function. */
rr = cm->function(mdev, nlp, reply);
retcode = ERR_MINOR_INVALID;
rr = 0;
switch (cm->type) {
case CHT_MINOR:
mdev = minor_to_mdev(nlp->drbd_minor);
if (!mdev)
goto fail;
rr = cm->minor_based(mdev, nlp, reply);
break;
case CHT_CONN:
tconn = conn_by_name(nlp->obj_name);
if (!tconn) {
retcode = ERR_CONN_NOT_KNOWN;
goto fail;
}
rr = cm->conn_based(tconn, nlp, reply);
break;
case CHT_CTOR:
rr = cm->constructor(nlp, reply);
break;
/* case CHT_RES: */
}
cn_reply->id = req->id;
cn_reply->seq = req->seq;

19
include/linux/drbd.h
View File

@ -155,6 +155,7 @@ enum drbd_ret_code {
ERR_CONG_NOT_PROTO_A = 155,
ERR_PIC_AFTER_DEP = 156,
ERR_PIC_PEER_DEP = 157,
ERR_CONN_NOT_KNOWN = 158,
/* insert new ones above this line */
AFTER_LAST_ERR_CODE
@ -347,8 +348,11 @@ enum drbd_timeout_flag {
/* Start of the new netlink/connector stuff */
#define DRBD_NL_CREATE_DEVICE 0x01
#define DRBD_NL_SET_DEFAULTS 0x02
enum drbd_ncr_flags {
DRBD_NL_CREATE_DEVICE = 0x01,
DRBD_NL_SET_DEFAULTS = 0x02,
};
#define DRBD_NL_OBJ_NAME_LEN 32
/* For searching a vacant cn_idx value */
@ -356,8 +360,15 @@ enum drbd_timeout_flag {
struct drbd_nl_cfg_req {
int packet_type;
unsigned int drbd_minor;
int flags;
union {
struct {
unsigned int drbd_minor;
enum drbd_ncr_flags flags;
};
struct {
char obj_name[DRBD_NL_OBJ_NAME_LEN];
};
};
unsigned short tag_list[];
};