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-rw-r--r--drivers/md/dm-cache-policy-internal.h163
1 files changed, 163 insertions, 0 deletions
diff --git a/drivers/md/dm-cache-policy-internal.h b/drivers/md/dm-cache-policy-internal.h
new file mode 100644
index 000000000..8e49baa78
--- /dev/null
+++ b/drivers/md/dm-cache-policy-internal.h
@@ -0,0 +1,163 @@
+/*
+ * Copyright (C) 2012 Red Hat. All rights reserved.
+ *
+ * This file is released under the GPL.
+ */
+
+#ifndef DM_CACHE_POLICY_INTERNAL_H
+#define DM_CACHE_POLICY_INTERNAL_H
+
+#include <linux/vmalloc.h>
+#include "dm-cache-policy.h"
+
+/*----------------------------------------------------------------*/
+
+static inline int policy_lookup(struct dm_cache_policy *p, dm_oblock_t oblock, dm_cblock_t *cblock,
+ int data_dir, bool fast_copy, bool *background_queued)
+{
+ return p->lookup(p, oblock, cblock, data_dir, fast_copy, background_queued);
+}
+
+static inline int policy_lookup_with_work(struct dm_cache_policy *p,
+ dm_oblock_t oblock, dm_cblock_t *cblock,
+ int data_dir, bool fast_copy,
+ struct policy_work **work)
+{
+ if (!p->lookup_with_work) {
+ *work = NULL;
+ return p->lookup(p, oblock, cblock, data_dir, fast_copy, NULL);
+ }
+
+ return p->lookup_with_work(p, oblock, cblock, data_dir, fast_copy, work);
+}
+
+static inline int policy_get_background_work(struct dm_cache_policy *p,
+ bool idle, struct policy_work **result)
+{
+ return p->get_background_work(p, idle, result);
+}
+
+static inline void policy_complete_background_work(struct dm_cache_policy *p,
+ struct policy_work *work,
+ bool success)
+{
+ return p->complete_background_work(p, work, success);
+}
+
+static inline void policy_set_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
+{
+ p->set_dirty(p, cblock);
+}
+
+static inline void policy_clear_dirty(struct dm_cache_policy *p, dm_cblock_t cblock)
+{
+ p->clear_dirty(p, cblock);
+}
+
+static inline int policy_load_mapping(struct dm_cache_policy *p,
+ dm_oblock_t oblock, dm_cblock_t cblock,
+ bool dirty, uint32_t hint, bool hint_valid)
+{
+ return p->load_mapping(p, oblock, cblock, dirty, hint, hint_valid);
+}
+
+static inline int policy_invalidate_mapping(struct dm_cache_policy *p,
+ dm_cblock_t cblock)
+{
+ return p->invalidate_mapping(p, cblock);
+}
+
+static inline uint32_t policy_get_hint(struct dm_cache_policy *p,
+ dm_cblock_t cblock)
+{
+ return p->get_hint ? p->get_hint(p, cblock) : 0;
+}
+
+static inline dm_cblock_t policy_residency(struct dm_cache_policy *p)
+{
+ return p->residency(p);
+}
+
+static inline void policy_tick(struct dm_cache_policy *p, bool can_block)
+{
+ if (p->tick)
+ return p->tick(p, can_block);
+}
+
+static inline int policy_emit_config_values(struct dm_cache_policy *p, char *result,
+ unsigned int maxlen, ssize_t *sz_ptr)
+{
+ ssize_t sz = *sz_ptr;
+ if (p->emit_config_values)
+ return p->emit_config_values(p, result, maxlen, sz_ptr);
+
+ DMEMIT("0 ");
+ *sz_ptr = sz;
+ return 0;
+}
+
+static inline int policy_set_config_value(struct dm_cache_policy *p,
+ const char *key, const char *value)
+{
+ return p->set_config_value ? p->set_config_value(p, key, value) : -EINVAL;
+}
+
+static inline void policy_allow_migrations(struct dm_cache_policy *p, bool allow)
+{
+ return p->allow_migrations(p, allow);
+}
+
+/*----------------------------------------------------------------*/
+
+/*
+ * Some utility functions commonly used by policies and the core target.
+ */
+static inline size_t bitset_size_in_bytes(unsigned int nr_entries)
+{
+ return sizeof(unsigned long) * dm_div_up(nr_entries, BITS_PER_LONG);
+}
+
+static inline unsigned long *alloc_bitset(unsigned int nr_entries)
+{
+ size_t s = bitset_size_in_bytes(nr_entries);
+ return vzalloc(s);
+}
+
+static inline void clear_bitset(void *bitset, unsigned int nr_entries)
+{
+ size_t s = bitset_size_in_bytes(nr_entries);
+ memset(bitset, 0, s);
+}
+
+static inline void free_bitset(unsigned long *bits)
+{
+ vfree(bits);
+}
+
+/*----------------------------------------------------------------*/
+
+/*
+ * Creates a new cache policy given a policy name, a cache size, an origin size and the block size.
+ */
+struct dm_cache_policy *dm_cache_policy_create(const char *name, dm_cblock_t cache_size,
+ sector_t origin_size, sector_t block_size);
+
+/*
+ * Destroys the policy. This drops references to the policy module as well
+ * as calling it's destroy method. So always use this rather than calling
+ * the policy->destroy method directly.
+ */
+void dm_cache_policy_destroy(struct dm_cache_policy *p);
+
+/*
+ * In case we've forgotten.
+ */
+const char *dm_cache_policy_get_name(struct dm_cache_policy *p);
+
+const unsigned int *dm_cache_policy_get_version(struct dm_cache_policy *p);
+
+size_t dm_cache_policy_get_hint_size(struct dm_cache_policy *p);
+
+/*----------------------------------------------------------------*/
+
+#endif /* DM_CACHE_POLICY_INTERNAL_H */