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dm: move target request nr to dm_target_io

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This patch moves target_request_nr from map_info to dm_target_io and
makes it accessible with dm_bio_get_target_request_nr.

This patch is a preparation for the next patch that removes map_info.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka
2012-12-21 20:23:39 +00:00
committed by Alasdair G Kergon
parent 42bc954f2a
commit ddbd658f64
4 changed files with 15 additions and 8 deletions
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14
include/linux/device-mapper.h
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@@ -23,7 +23,6 @@ typedef enum { STATUSTYPE_INFO, STATUSTYPE_TABLE } status_type_t;
union map_info {
void *ptr;
unsigned long long ll;
unsigned target_request_nr;
};
/*
@@ -193,20 +192,21 @@ struct dm_target {
* 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->target_request_nr.
* The request number can be accessed with dm_bio_get_target_request_nr.
* It is a responsibility of the target driver to remap these requests
* to the real underlying devices.
*/
unsigned num_flush_requests;
/*
* The number of discard requests that will be submitted to the
* target. map_info->request_nr is used just like num_flush_requests.
* The number of discard requests that will be submitted to the target.
* The request number can be accessed with dm_bio_get_target_request_nr.
*/
unsigned num_discard_requests;
/*
* The number of WRITE SAME requests that will be submitted to the target.
* The request number can be accessed with dm_bio_get_target_request_nr.
*/
unsigned num_write_same_requests;
@@ -263,6 +263,7 @@ struct dm_target_io {
struct dm_io *io;
struct dm_target *ti;
union map_info info;
unsigned target_request_nr;
struct bio clone;
};
@@ -276,6 +277,11 @@ static inline struct bio *dm_bio_from_per_bio_data(void *data, size_t data_size)
return (struct bio *)((char *)data + data_size + offsetof(struct dm_target_io, clone));
}
static inline unsigned dm_bio_get_target_request_nr(const struct bio *bio)
{
return container_of(bio, struct dm_target_io, clone)->target_request_nr;
}
int dm_register_target(struct target_type *t);
void dm_unregister_target(struct target_type *t);