From: Mike Snitzer <snitzer@xxxxxxxxxx>
This patch does NOT apply to the 3.12 stable tree. If you still want
it applied, please provide a backport.
===============
commit c6eda5e81c4fcc77185117255c7419eda771f67f upstream.
Commit c9d28d5d ("dm cache: promotion optimisation for writes")
incorrectly placed the 'hook_info' member in the writethrough-only
portion of the per_bio_data structure.
Given that the overwrite optimization may be used for writeback the
'hook_info' member must be placed above the 'cache' member of the
per_bio_data structure. Any members above 'cache' are available from
both writeback and writethrough modes' per_bio_data structure.
Signed-off-by: Mike Snitzer <snitzer@xxxxxxxxxx>
Acked-by: Joe Thornber <ejt@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx # 3.13+
---
drivers/md/dm-cache-target.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
index ffd472e015ca..14256b7fce79 100644
--- a/drivers/md/dm-cache-target.c
+++ b/drivers/md/dm-cache-target.c
@@ -289,6 +289,7 @@ struct per_bio_data {
bool tick:1;
unsigned req_nr:2;
struct dm_deferred_entry *all_io_entry;
+ struct dm_hook_info hook_info;
/*
* writethrough fields. These MUST remain at the end of this
@@ -297,7 +298,6 @@ struct per_bio_data {
*/
struct cache *cache;
dm_cblock_t cblock;
- struct dm_hook_info hook_info;
struct dm_bio_details bio_details;
};
--
1.9.0
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