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-rw-r--r--fs/btrfs/lru_cache.h75
1 files changed, 75 insertions, 0 deletions
diff --git a/fs/btrfs/lru_cache.h b/fs/btrfs/lru_cache.h
new file mode 100644
index 000000000..00328c856
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+++ b/fs/btrfs/lru_cache.h
@@ -0,0 +1,75 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef BTRFS_LRU_CACHE_H
+#define BTRFS_LRU_CACHE_H
+
+#include <linux/maple_tree.h>
+#include <linux/list.h>
+
+/*
+ * A cache entry. This is meant to be embedded in a structure of a user of
+ * this module. Similar to how struct list_head and struct rb_node are used.
+ *
+ * Note: it should be embedded as the first element in a struct (offset 0), and
+ * this module assumes it was allocated with kmalloc(), so it calls kfree() when
+ * it needs to free an entry.
+ */
+struct btrfs_lru_cache_entry {
+ struct list_head lru_list;
+ u64 key;
+ /*
+ * Optional generation associated to a key. Use 0 if not needed/used.
+ * Entries with the same key and different generations are stored in a
+ * linked list, so use this only for cases where there's a small number
+ * of different generations.
+ */
+ u64 gen;
+ /*
+ * The maple tree uses unsigned long type for the keys, which is 32 bits
+ * on 32 bits systems, and 64 bits on 64 bits systems. So if we want to
+ * use something like inode numbers as keys, which are always a u64, we
+ * have to deal with this in a special way - we store the key in the
+ * entry itself, as a u64, and the values inserted into the maple tree
+ * are linked lists of entries - so in case we are on a 64 bits system,
+ * that list always has a single entry, while on 32 bits systems it
+ * may have more than one, with each entry having the same value for
+ * their lower 32 bits of the u64 key.
+ */
+ struct list_head list;
+};
+
+struct btrfs_lru_cache {
+ struct list_head lru_list;
+ struct maple_tree entries;
+ /* Number of entries stored in the cache. */
+ unsigned int size;
+ /* Maximum number of entries the cache can have. */
+ unsigned int max_size;
+};
+
+#define btrfs_lru_cache_for_each_entry_safe(cache, entry, tmp) \
+ list_for_each_entry_safe_reverse((entry), (tmp), &(cache)->lru_list, lru_list)
+
+static inline unsigned int btrfs_lru_cache_size(const struct btrfs_lru_cache *cache)
+{
+ return cache->size;
+}
+
+static inline struct btrfs_lru_cache_entry *btrfs_lru_cache_lru_entry(
+ struct btrfs_lru_cache *cache)
+{
+ return list_first_entry_or_null(&cache->lru_list,
+ struct btrfs_lru_cache_entry, lru_list);
+}
+
+void btrfs_lru_cache_init(struct btrfs_lru_cache *cache, unsigned int max_size);
+struct btrfs_lru_cache_entry *btrfs_lru_cache_lookup(struct btrfs_lru_cache *cache,
+ u64 key, u64 gen);
+int btrfs_lru_cache_store(struct btrfs_lru_cache *cache,
+ struct btrfs_lru_cache_entry *new_entry,
+ gfp_t gfp);
+void btrfs_lru_cache_remove(struct btrfs_lru_cache *cache,
+ struct btrfs_lru_cache_entry *entry);
+void btrfs_lru_cache_clear(struct btrfs_lru_cache *cache);
+
+#endif