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Diffstat (limited to 'include/linux/device-mapper.h')
-rw-r--r--include/linux/device-mapper.h29
1 files changed, 22 insertions, 7 deletions
diff --git a/include/linux/device-mapper.h b/include/linux/device-mapper.h
index 98f34b8..38d27a1 100644
--- a/include/linux/device-mapper.h
+++ b/include/linux/device-mapper.h
@@ -66,14 +66,13 @@ typedef int (*dm_request_endio_fn) (struct dm_target *ti,
struct request *clone, int error,
union map_info *map_context);
-typedef void (*dm_flush_fn) (struct dm_target *ti);
typedef void (*dm_presuspend_fn) (struct dm_target *ti);
typedef void (*dm_postsuspend_fn) (struct dm_target *ti);
typedef int (*dm_preresume_fn) (struct dm_target *ti);
typedef void (*dm_resume_fn) (struct dm_target *ti);
typedef int (*dm_status_fn) (struct dm_target *ti, status_type_t status_type,
- char *result, unsigned int maxlen);
+ unsigned status_flags, char *result, unsigned maxlen);
typedef int (*dm_message_fn) (struct dm_target *ti, unsigned argc, char **argv);
@@ -139,7 +138,6 @@ struct target_type {
dm_map_request_fn map_rq;
dm_endio_fn end_io;
dm_request_endio_fn rq_end_io;
- dm_flush_fn flush;
dm_presuspend_fn presuspend;
dm_postsuspend_fn postsuspend;
dm_preresume_fn preresume;
@@ -188,8 +186,8 @@ struct dm_target {
sector_t begin;
sector_t len;
- /* Always a power of 2 */
- sector_t split_io;
+ /* If non-zero, maximum size of I/O submitted to a target. */
+ uint32_t max_io_len;
/*
* A number of zero-length barrier requests that will be submitted
@@ -214,15 +212,27 @@ struct dm_target {
char *error;
/*
+ * Set if this target needs to receive flushes regardless of
+ * whether or not its underlying devices have support.
+ */
+ bool flush_supported:1;
+
+ /*
* Set if this target needs to receive discards regardless of
* whether or not its underlying devices have support.
*/
- unsigned discards_supported:1;
+ bool discards_supported:1;
+
+ /*
+ * Set if the target required discard request to be split
+ * on max_io_len boundary.
+ */
+ bool split_discard_requests:1;
/*
* Set if this target does not return zeroes on discarded blocks.
*/
- unsigned discard_zeroes_data_unsupported:1;
+ bool discard_zeroes_data_unsupported:1;
};
/* Each target can link one of these into the table */
@@ -360,6 +370,11 @@ void dm_table_add_target_callbacks(struct dm_table *t, struct dm_target_callback
int dm_table_complete(struct dm_table *t);
/*
+ * Target may require that it is never sent I/O larger than len.
+ */
+int __must_check dm_set_target_max_io_len(struct dm_target *ti, sector_t len);
+
+/*
* Table reference counting.
*/
struct dm_table *dm_get_live_table(struct mapped_device *md);
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