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-rw-r--r--include/linux/device-mapper.h47
1 files changed, 30 insertions, 17 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 49c2362..0d63106 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -11,6 +11,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
+struct dm_dev;
struct dm_target;
struct dm_table;
struct mapped_device;
@@ -21,6 +22,7 @@ typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
union map_info {
void *ptr;
unsigned long long ll;
+ unsigned flush_request;
};
/*
@@ -80,6 +82,15 @@ typedef int (*dm_ioctl_fn) (struct dm_target *ti, unsigned int cmd,
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 physical_start,
+ void *data);
+
+typedef int (*dm_iterate_devices_fn) (struct dm_target *ti,
+ iterate_devices_callout_fn fn,
+ void *data);
+
/*
* Returns:
* 0: The target can handle the next I/O immediately.
@@ -92,7 +103,8 @@ void dm_error(const char *message);
/*
* 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, void *data);
struct dm_dev {
struct block_device *bdev;
@@ -138,23 +150,12 @@ struct target_type {
dm_ioctl_fn ioctl;
dm_merge_fn merge;
dm_busy_fn busy;
+ dm_iterate_devices_fn iterate_devices;
/* For internal device-mapper use. */
struct list_head list;
};
-struct io_restrictions {
- unsigned long bounce_pfn;
- unsigned long seg_boundary_mask;
- unsigned max_hw_sectors;
- unsigned max_sectors;
- unsigned max_segment_size;
- unsigned short logical_block_size;
- unsigned short max_hw_segments;
- unsigned short max_phys_segments;
- unsigned char no_cluster; /* inverted so that 0 is default */
-};
-
struct dm_target {
struct dm_table *table;
struct target_type *type;
@@ -163,15 +164,18 @@ struct dm_target {
sector_t begin;
sector_t len;
- /* FIXME: turn this into a mask, and merge with io_restrictions */
/* Always a power of 2 */
sector_t split_io;
/*
- * These are automatically filled in by
- * dm_table_get_device.
+ * A number of zero-length barrier requests that will be submitted
+ * to the target for the purpose of flushing cache.
+ *
+ * The request number will be placed in union map_info->flush_request.
+ * It is a responsibility of the target driver to remap these requests
+ * to the real underlying devices.
*/
- struct io_restrictions limits;
+ unsigned num_flush_requests;
/* target specific data */
void *private;
@@ -230,6 +234,7 @@ struct gendisk *dm_disk(struct mapped_device *md);
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.
@@ -392,4 +397,12 @@ static inline unsigned long to_bytes(sector_t n)
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 */
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