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Diffstat (limited to 'drivers/md/dm.h')
-rw-r--r--drivers/md/dm.h27
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h
index 45b97da1bd06..5e604cc7b4aa 100644
--- a/drivers/md/dm.h
+++ b/drivers/md/dm.h
@@ -16,6 +16,8 @@
#include <linux/blkdev.h>
#include <linux/hdreg.h>
+#include "dm-stats.h"
+
/*
* Suspend feature flags
*/
@@ -89,10 +91,21 @@ int dm_setup_md_queue(struct mapped_device *md);
#define dm_target_is_valid(t) ((t)->table)
/*
+ * To check whether the target type is bio-based or not (request-based).
+ */
+#define dm_target_bio_based(t) ((t)->type->map != NULL)
+
+/*
* To check whether the target type is request-based or not (bio-based).
*/
#define dm_target_request_based(t) ((t)->type->map_rq != NULL)
+/*
+ * To check whether the target type is a hybrid (capable of being
+ * either request-based or bio-based).
+ */
+#define dm_target_hybrid(t) (dm_target_bio_based(t) && dm_target_request_based(t))
+
/*-----------------------------------------------------------------
* A registry of target types.
*---------------------------------------------------------------*/
@@ -146,10 +159,16 @@ void dm_destroy(struct mapped_device *md);
void dm_destroy_immediate(struct mapped_device *md);
int dm_open_count(struct mapped_device *md);
int dm_lock_for_deletion(struct mapped_device *md);
+int dm_request_based(struct mapped_device *md);
+sector_t dm_get_size(struct mapped_device *md);
+struct dm_stats *dm_get_stats(struct mapped_device *md);
int dm_kobject_uevent(struct mapped_device *md, enum kobject_action action,
unsigned cookie);
+void dm_internal_suspend(struct mapped_device *md);
+void dm_internal_resume(struct mapped_device *md);
+
int dm_io_init(void);
void dm_io_exit(void);
@@ -162,4 +181,12 @@ void dm_kcopyd_exit(void);
struct dm_md_mempools *dm_alloc_md_mempools(unsigned type, unsigned integrity, unsigned per_bio_data_size);
void dm_free_md_mempools(struct dm_md_mempools *pools);
+/*
+ * Helpers that are used by DM core
+ */
+static inline bool dm_message_test_buffer_overflow(char *result, unsigned maxlen)
+{
+ return !maxlen || strlen(result) + 1 >= maxlen;
+}
+
#endif