diff options
Diffstat (limited to 'drivers/md/dm.h')
| -rw-r--r-- | drivers/md/dm.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/drivers/md/dm.h b/drivers/md/dm.h index 45b97da1bd0..5e604cc7b4a 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 |