#include <linux/bio.h>
#include <linux/blkdev.h>
+struct dm_dev;
struct dm_target;
struct dm_table;
struct mapped_device;
typedef int (*dm_merge_fn) (struct dm_target *ti, struct bvec_merge_data *bvm,
struct bio_vec *biovec, int max_size);
+typedef int (*iterate_devices_callout_fn) (struct dm_target *ti,
+ struct dm_dev *dev,
+ sector_t start, sector_t len,
+ void *data);
+
+typedef int (*dm_iterate_devices_fn) (struct dm_target *ti,
+ iterate_devices_callout_fn fn,
+ void *data);
+
+typedef void (*dm_io_hints_fn) (struct dm_target *ti,
+ struct queue_limits *limits);
+
/*
* Returns:
* 0: The target can handle the next I/O immediately.
/*
* Combine device limits.
*/
-void dm_set_device_limits(struct dm_target *ti, struct block_device *bdev);
+int dm_set_device_limits(struct dm_target *ti, struct dm_dev *dev,
+ sector_t start, sector_t len, void *data);
struct dm_dev {
struct block_device *bdev;
dm_ioctl_fn ioctl;
dm_merge_fn merge;
dm_busy_fn busy;
+ dm_iterate_devices_fn iterate_devices;
+ dm_io_hints_fn io_hints;
/* For internal device-mapper use. */
struct list_head list;
sector_t begin;
sector_t len;
- /* FIXME: turn this into a mask, and merge with queue_limits */
/* Always a power of 2 */
sector_t split_io;
*/
unsigned num_flush_requests;
- /*
- * These are automatically filled in by
- * dm_table_get_device.
- */
- struct queue_limits limits;
-
/* target specific data */
void *private;
int dm_suspended(struct mapped_device *md);
int dm_noflush_suspending(struct dm_target *ti);
union map_info *dm_get_mapinfo(struct bio *bio);
+union map_info *dm_get_rq_mapinfo(struct request *rq);
/*
* Geometry functions.
return (n << SECTOR_SHIFT);
}
+/*-----------------------------------------------------------------
+ * Helper for block layer and dm core operations
+ *---------------------------------------------------------------*/
+void dm_dispatch_request(struct request *rq);
+void dm_requeue_unmapped_request(struct request *rq);
+void dm_kill_unmapped_request(struct request *rq, int error);
+int dm_underlying_device_busy(struct request_queue *q);
+
#endif /* _LINUX_DEVICE_MAPPER_H */