drbd: Split off netlink mandatory attribute handling into separate file

Duplicate this file in the kernel module and in user space; both sides need it.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>

6 files changed, 66 insertions, 56 deletions

diff --git a/drivers/block/drbd/Makefile b/drivers/block/drbd/Makefile
index 06fb4453734c..8b450338075e 100644
--- a/drivers/block/drbd/Makefile
+++ b/drivers/block/drbd/Makefile
@@ -2,5 +2,6 @@ drbd-y := drbd_bitmap.o drbd_proc.o
 drbd-y += drbd_worker.o drbd_receiver.o drbd_req.o drbd_actlog.o
 drbd-y += drbd_main.o drbd_strings.o drbd_nl.o
 drbd-y += drbd_interval.o drbd_state.o
+drbd-y += drbd_nla.o
 
 obj-$(CONFIG_BLK_DEV_DRBD)     += drbd.o
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index c58430183d5f..c3019730a24f 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -1407,12 +1407,6 @@ extern bool conn_try_outdate_peer(struct drbd_tconn *tconn);
 extern void conn_try_outdate_peer_async(struct drbd_tconn *tconn);
 extern int drbd_khelper(struct drbd_conf *mdev, char *cmd);
 
-struct nla_policy;
-extern int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla);
-extern int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
-                                 const struct nla_policy *policy);
-extern struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype);
-
 /* drbd_worker.c */
 extern int drbd_worker(struct drbd_thread *thi);
 enum drbd_ret_code drbd_resync_after_valid(struct drbd_conf *mdev, int o_minor);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 24187f1c93d5..45bb5cebb59d 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -75,6 +75,7 @@ int drbd_adm_get_timeout_type(struct sk_buff *skb, struct genl_info *info);
 int drbd_adm_get_status_all(struct sk_buff *skb, struct netlink_callback *cb);
 
 #include <linux/drbd_genl_api.h>
+#include "drbd_nla.h"
 #include <linux/genl_magic_func.h>
 
 /* used blkdev_get_by_path, to claim our meta data device(s) */
@@ -3219,53 +3220,3 @@ failed:
                         "Event seq:%u sib_reason:%u\n",
                         err, seq, sib->sib_reason);
 }
-
-int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
-{
-        struct nlattr *head = nla_data(nla);
-        int len = nla_len(nla);
-        int rem;
-
-        /*
-         * validate_nla (called from nla_parse_nested) ignores attributes
-         * beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
-         * In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
-         * flag set also, check and remove that flag before calling
-         * nla_parse_nested.
-         */
-
-        nla_for_each_attr(nla, head, len, rem) {
-                if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
-                        nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
-                        if (nla_type(nla) > maxtype)
-                                return -EOPNOTSUPP;
-                }
-        }
-        return 0;
-}
-
-int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
-                          const struct nla_policy *policy)
-{
-        int err;
-
-        err = drbd_nla_check_mandatory(maxtype, nla);
-        if (!err)
-                err = nla_parse_nested(tb, maxtype, nla, policy);
-
-        return err;
-}
-
-struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype)
-{
-        int err;
-        /*
-         * If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and
-         * we don't know about that attribute, reject all the nested
-         * attributes.
-         */
-        err = drbd_nla_check_mandatory(maxtype, nla);
-        if (err)
-                return ERR_PTR(err);
-        return nla_find_nested(nla, attrtype);
-}
diff --git a/drivers/block/drbd/drbd_nla.c b/drivers/block/drbd/drbd_nla.c
new file mode 100644
index 000000000000..fa672b6df8d6
--- /dev/null
+++ b/drivers/block/drbd/drbd_nla.c
@@ -0,0 +1,55 @@
+#include "drbd_wrappers.h"
+#include <linux/kernel.h>
+#include <net/netlink.h>
+#include <linux/drbd_genl_api.h>
+#include "drbd_nla.h"
+
+static int drbd_nla_check_mandatory(int maxtype, struct nlattr *nla)
+{
+        struct nlattr *head = nla_data(nla);
+        int len = nla_len(nla);
+        int rem;
+
+        /*
+         * validate_nla (called from nla_parse_nested) ignores attributes
+         * beyond maxtype, and does not understand the DRBD_GENLA_F_MANDATORY flag.
+         * In order to have it validate attributes with the DRBD_GENLA_F_MANDATORY
+         * flag set also, check and remove that flag before calling
+         * nla_parse_nested.
+         */
+
+        nla_for_each_attr(nla, head, len, rem) {
+                if (nla->nla_type & DRBD_GENLA_F_MANDATORY) {
+                        nla->nla_type &= ~DRBD_GENLA_F_MANDATORY;
+                        if (nla_type(nla) > maxtype)
+                                return -EOPNOTSUPP;
+                }
+        }
+        return 0;
+}
+
+int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
+                          const struct nla_policy *policy)
+{
+        int err;
+
+        err = drbd_nla_check_mandatory(maxtype, nla);
+        if (!err)
+                err = nla_parse_nested(tb, maxtype, nla, policy);
+
+        return err;
+}
+
+struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype)
+{
+        int err;
+        /*
+         * If any nested attribute has the DRBD_GENLA_F_MANDATORY flag set and
+         * we don't know about that attribute, reject all the nested
+         * attributes.
+         */
+        err = drbd_nla_check_mandatory(maxtype, nla);
+        if (err)
+                return ERR_PTR(err);
+        return nla_find_nested(nla, attrtype);
+}
diff --git a/drivers/block/drbd/drbd_nla.h b/drivers/block/drbd/drbd_nla.h
new file mode 100644
index 000000000000..679c2d5b4535
--- /dev/null
+++ b/drivers/block/drbd/drbd_nla.h
@@ -0,0 +1,8 @@
+#ifndef __DRBD_NLA_H
+#define __DRBD_NLA_H
+
+extern int drbd_nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla,
+                                 const struct nla_policy *policy);
+extern struct nlattr *drbd_nla_find_nested(int maxtype, struct nlattr *nla, int attrtype);
+
+#endif  /* __DRBD_NLA_H */
diff --git a/drivers/block/drbd/drbd_wrappers.h b/drivers/block/drbd/drbd_wrappers.h
index 46a6d99f7b61..328f18e4b4ee 100644
--- a/drivers/block/drbd/drbd_wrappers.h
+++ b/drivers/block/drbd/drbd_wrappers.h
@@ -3,6 +3,7 @@
 
 #include <linux/ctype.h>
 #include <linux/mm.h>
+#include "drbd_int.h"
 
 /* see get_sb_bdev and bd_claim */
 extern char *drbd_sec_holder;