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drbd: Take a reference on tconn when finding a tconn by name 

Rule #3 of kref.txt

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 2011-04-24 10:53:19 +02:00
parent 9dc9fbb357
commit 0ace9dfabe
3 changed files with 16 additions and 7 deletions
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2
drivers/block/drbd/drbd_int.h
View File

@ -1381,7 +1381,7 @@ extern void drbd_delete_device(struct drbd_conf *mdev);
struct drbd_tconn *conn_create(const char *name);
extern void conn_destroy(struct kref *kref);
struct drbd_tconn *conn_by_name(const char *name);
struct drbd_tconn *conn_get_by_name(const char *name);
extern void conn_free_crypto(struct drbd_tconn *tconn);
extern int proc_details;

6
drivers/block/drbd/drbd_main.c
View File

@ -2362,7 +2362,7 @@ 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 *conn_get_by_name(const char *name)
{
struct drbd_tconn *tconn;
@ -2371,8 +2371,10 @@ struct drbd_tconn *conn_by_name(const char *name)
down_read(&drbd_cfg_rwsem);
list_for_each_entry(tconn, &drbd_tconns, all_tconn) {
if (!strcmp(tconn->name, name))
if (!strcmp(tconn->name, name)) {
kref_get(&tconn->kref);
goto found;
}
}
tconn = NULL;
found:

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

@ -195,7 +195,7 @@ static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
adm_ctx.minor = d_in->minor;
adm_ctx.mdev = minor_to_mdev(d_in->minor);
adm_ctx.tconn = conn_by_name(adm_ctx.conn_name);
adm_ctx.tconn = conn_get_by_name(adm_ctx.conn_name);
if (!adm_ctx.mdev && (flags & DRBD_ADM_NEED_MINOR)) {
drbd_msg_put_info("unknown minor");
@ -223,8 +223,7 @@ static int drbd_adm_prepare(struct sk_buff *skb, struct genl_info *info,
drbd_msg_put_info("minor exists as different volume");
return ERR_INVALID_REQUEST;
}
if (adm_ctx.mdev && !adm_ctx.tconn)
adm_ctx.tconn = adm_ctx.mdev->tconn;
return NO_ERROR;
fail:
@ -238,6 +237,11 @@ static int drbd_adm_finish(struct genl_info *info, int retcode)
struct nlattr *nla;
const char *conn_name = NULL;
if (adm_ctx.tconn) {
kref_put(&adm_ctx.tconn->kref, &conn_destroy);
adm_ctx.tconn = NULL;
}
if (!adm_ctx.reply_skb)
return -ENOMEM;
@ -2748,10 +2752,13 @@ int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb)
if (!nla)
return -EINVAL;
conn_name = nla_data(nla);
tconn = conn_by_name(conn_name);
tconn = conn_get_by_name(conn_name);
if (!tconn)
return -ENODEV;
kref_put(&tconn->kref, &conn_destroy); /* get_one_status() (re)validates tconn by itself */
/* prime iterators, and set "filter" mode mark:
* only dump this tconn. */
cb->args[0] = (long)tconn;