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path: root/drivers/staging/pohmelfs/config.c
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Diffstat (limited to 'drivers/staging/pohmelfs/config.c')
-rw-r--r--drivers/staging/pohmelfs/config.c61
1 files changed, 56 insertions, 5 deletions
diff --git a/drivers/staging/pohmelfs/config.c b/drivers/staging/pohmelfs/config.c
index 3e67da9ea38..a6eaa42fb66 100644
--- a/drivers/staging/pohmelfs/config.c
+++ b/drivers/staging/pohmelfs/config.c
@@ -81,6 +81,45 @@ static struct pohmelfs_config_group *pohmelfs_find_create_config_group(unsigned
return g;
}
+static inline void pohmelfs_insert_config_entry(struct pohmelfs_sb *psb, struct pohmelfs_config *dst)
+{
+ struct pohmelfs_config *tmp;
+
+ INIT_LIST_HEAD(&dst->config_entry);
+
+ list_for_each_entry(tmp, &psb->state_list, config_entry) {
+ if (dst->state.ctl.prio > tmp->state.ctl.prio)
+ list_add_tail(&dst->config_entry, &tmp->config_entry);
+ }
+ if (list_empty(&dst->config_entry))
+ list_add_tail(&dst->config_entry, &psb->state_list);
+}
+
+static int pohmelfs_move_config_entry(struct pohmelfs_sb *psb,
+ struct pohmelfs_config *dst, struct pohmelfs_config *new)
+{
+ if ((dst->state.ctl.prio == new->state.ctl.prio) &&
+ (dst->state.ctl.perm == new->state.ctl.perm))
+ return 0;
+
+ dprintk("%s: dst: prio: %d, perm: %x, new: prio: %d, perm: %d.\n",
+ __func__, dst->state.ctl.prio, dst->state.ctl.perm,
+ new->state.ctl.prio, new->state.ctl.perm);
+ dst->state.ctl.prio = new->state.ctl.prio;
+ dst->state.ctl.perm = new->state.ctl.perm;
+
+ list_del_init(&dst->config_entry);
+ pohmelfs_insert_config_entry(psb, dst);
+ return 0;
+}
+
+/*
+ * pohmelfs_copy_config() is used to copy new state configs from the
+ * config group (controlled by the netlink messages) into the superblock.
+ * This happens either at startup time where no transactions can access
+ * the list of the configs (and thus list of the network states), or at
+ * run-time, where it is protected by the psb->state_lock.
+ */
int pohmelfs_copy_config(struct pohmelfs_sb *psb)
{
struct pohmelfs_config_group *g;
@@ -103,7 +142,9 @@ int pohmelfs_copy_config(struct pohmelfs_sb *psb)
err = 0;
list_for_each_entry(dst, &psb->state_list, config_entry) {
if (pohmelfs_config_eql(&dst->state.ctl, &c->state.ctl)) {
- err = -EEXIST;
+ err = pohmelfs_move_config_entry(psb, dst, c);
+ if (!err)
+ err = -EEXIST;
break;
}
}
@@ -119,7 +160,7 @@ int pohmelfs_copy_config(struct pohmelfs_sb *psb)
memcpy(&dst->state.ctl, &c->state.ctl, sizeof(struct pohmelfs_ctl));
- list_add_tail(&dst->config_entry, &psb->state_list);
+ pohmelfs_insert_config_entry(psb, dst);
err = pohmelfs_state_init_one(psb, dst);
if (err) {
@@ -248,6 +289,13 @@ out_unlock:
return err;
}
+static int pohmelfs_modify_config(struct pohmelfs_ctl *old, struct pohmelfs_ctl *new)
+{
+ old->perm = new->perm;
+ old->prio = new->prio;
+ return 0;
+}
+
static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
{
struct pohmelfs_config_group *g;
@@ -278,6 +326,9 @@ static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
g->num_entry--;
kfree(c);
goto out_unlock;
+ } else if (action == POHMELFS_FLAGS_MODIFY) {
+ err = pohmelfs_modify_config(sc, ctl);
+ goto out_unlock;
} else {
err = -EEXIST;
goto out_unlock;
@@ -296,6 +347,7 @@ static int pohmelfs_cn_ctl(struct cn_msg *msg, int action)
}
memcpy(&c->state.ctl, ctl, sizeof(struct pohmelfs_ctl));
g->num_entry++;
+
list_add_tail(&c->config_entry, &g->config_list);
out_unlock:
@@ -401,10 +453,9 @@ static void pohmelfs_cn_callback(void *data)
switch (msg->flags) {
case POHMELFS_FLAGS_ADD:
- err = pohmelfs_cn_ctl(msg, POHMELFS_FLAGS_ADD);
- break;
case POHMELFS_FLAGS_DEL:
- err = pohmelfs_cn_ctl(msg, POHMELFS_FLAGS_DEL);
+ case POHMELFS_FLAGS_MODIFY:
+ err = pohmelfs_cn_ctl(msg, msg->flags);
break;
case POHMELFS_FLAGS_SHOW:
err = pohmelfs_cn_disp(msg);