-struct ima_imbalance {
- struct hlist_node node;
- unsigned long fsmagic;
-};
-
-/*
- * ima_limit_imbalance - emit one imbalance message per filesystem type
- *
- * Maintain list of filesystem types that do not measure files properly.
- * Return false if unknown, true if known.
- */
-static bool ima_limit_imbalance(struct file *file)
-{
- static DEFINE_SPINLOCK(ima_imbalance_lock);
- static HLIST_HEAD(ima_imbalance_list);
-
- struct super_block *sb = file->f_dentry->d_sb;
- struct ima_imbalance *entry;
- struct hlist_node *node;
- bool found = false;
-
- rcu_read_lock();
- hlist_for_each_entry_rcu(entry, node, &ima_imbalance_list, node) {
- if (entry->fsmagic == sb->s_magic) {
- found = true;
- break;
- }
- }
- rcu_read_unlock();
- if (found)
- goto out;
-
- entry = kmalloc(sizeof(*entry), GFP_NOFS);
- if (!entry)
- goto out;
- entry->fsmagic = sb->s_magic;
- spin_lock(&ima_imbalance_lock);
- /*
- * we could have raced and something else might have added this fs
- * to the list, but we don't really care
- */
- hlist_add_head_rcu(&entry->node, &ima_imbalance_list);
- spin_unlock(&ima_imbalance_lock);
- printk(KERN_INFO "IMA: unmeasured files on fsmagic: %lX\n",
- entry->fsmagic);
-out:
- return found;
-}
-