From: Alasdair G Kergon <agk@redhat.com>
Export map_info (part of bio->bi_private) for targets like multipath to use
for storing context.
Signed-Off-By: Alasdair G Kergon <agk@redhat.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---
25-akpm/drivers/md/dm.c | 9 +++++++++
25-akpm/drivers/md/dm.h | 1 +
2 files changed, 10 insertions(+)
diff -puN drivers/md/dm.c~device-mapper-export-map_info drivers/md/dm.c
--- 25/drivers/md/dm.c~device-mapper-export-map_info 2005-02-22 18:19:24.000000000 -0800
+++ 25-akpm/drivers/md/dm.c 2005-02-22 18:19:24.000000000 -0800
@@ -43,6 +43,13 @@ struct target_io {
union map_info info;
};
+union map_info *dm_get_mapinfo(struct bio *bio)
+{
+ if (bio && bio->bi_private)
+ return &((struct target_io *)bio->bi_private)->info;
+ return NULL;
+}
+
/*
* Bits for the md->flags field.
*/
@@ -1172,6 +1179,8 @@ static struct block_device_operations dm
.owner = THIS_MODULE
};
+EXPORT_SYMBOL(dm_get_mapinfo);
+
/*
* module hooks
*/
diff -puN drivers/md/dm.h~device-mapper-export-map_info drivers/md/dm.h
--- 25/drivers/md/dm.h~device-mapper-export-map_info 2005-02-22 18:19:24.000000000 -0800
+++ 25-akpm/drivers/md/dm.h 2005-02-22 18:19:24.000000000 -0800
@@ -190,5 +190,6 @@ int dm_stripe_init(void);
void dm_stripe_exit(void);
void *dm_vcalloc(unsigned long nmemb, unsigned long elem_size);
+union map_info *dm_get_mapinfo(struct bio *bio);
#endif
_