diff options
Diffstat (limited to 'include/linux')
| -rw-r--r-- | include/linux/device-mapper.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h index 40ea6338e1a1..a9ecba77fb30 100644 --- a/include/linux/device-mapper.h +++ b/include/linux/device-mapper.h @@ -13,6 +13,11 @@ struct dm_dev; typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t; +union map_info { + void *ptr; + unsigned long long ll; +}; + /* * In the constructor the target parameter will already have the * table, type, begin and len fields filled in. @@ -32,7 +37,19 @@ typedef void (*dm_dtr_fn) (struct dm_target *ti); * = 0: The target will handle the io by resubmitting it later * > 0: simple remap complete */ -typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio); +typedef int (*dm_map_fn) (struct dm_target *ti, struct bio *bio, + union map_info *map_context); + +/* + * Returns: + * < 0 : error (currently ignored) + * 0 : ended successfully + * 1 : for some reason the io has still not completed (eg, + * multipath target might want to requeue a failed io). + */ +typedef int (*dm_endio_fn) (struct dm_target *ti, + struct bio *bio, int error, + union map_info *map_context); typedef void (*dm_suspend_fn) (struct dm_target *ti); typedef void (*dm_resume_fn) (struct dm_target *ti); @@ -60,6 +77,7 @@ struct target_type { dm_ctr_fn ctr; dm_dtr_fn dtr; dm_map_fn map; + dm_endio_fn end_io; dm_suspend_fn suspend; dm_resume_fn resume; dm_status_fn status; |