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dm cache: move hook_info into common portion of per_bio_data structure 

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@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
Cc: stable@vger.kernel.org # 3.13+
This commit is contained in:
Mike Snitzer 2014-01-31 14:11:54 -05:00
parent 6d0abeca32
commit c6eda5e81c
1 changed files with 1 additions and 1 deletions
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2
drivers/md/dm-cache-target.c
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@ -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;
};