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| author | Philipp Reisner | 2011-04-24 10:53:19 +0200 |
|---|---|---|
| committer | Philipp Reisner | 2012-11-08 16:49:06 +0100 |
| commit | 0ace9dfabec3c1e96a1cd9fe0791ecbe6737c2f9 (patch) | |
| tree | de80467afbc59c4d98cdf6a3defa55fee051ac98 /drivers/block | |
| parent | drbd: Basic refcounting for drbd_tconn (diff) | |
| download | kernel-qcow2-linux-0ace9dfabec3c1e96a1cd9fe0791ecbe6737c2f9.tar.gz kernel-qcow2-linux-0ace9dfabec3c1e96a1cd9fe0791ecbe6737c2f9.tar.xz kernel-qcow2-linux-0ace9dfabec3c1e96a1cd9fe0791ecbe6737c2f9.zip | |
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>
Diffstat (limited to 'drivers/block')
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 2 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_main.c | 6 | ||||
| -rw-r--r-- | drivers/block/drbd/drbd_nl.c | 15 |
3 files changed, 16 insertions, 7 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 3abf982ec559..7797879d3264 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -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; diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c index 11427f59c5af..f0a0e1759bab 100644 --- a/drivers/block/drbd/drbd_main.c +++ b/drivers/block/drbd/drbd_main.c @@ -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: diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c index 23c34baa75a4..272c4a08ee42 100644 --- a/drivers/block/drbd/drbd_nl.c +++ b/drivers/block/drbd/drbd_nl.c @@ -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; |