md: Removal of hash table in linear raid

Get rid of sector_div and hash table for linear raid and replace
with a linear search in which_dev.
The hash table adds a lot of complexity for little if any gain.
Ultimately a binary search will be used which will have smaller
cache foot print, a similar number of memory access, and no
divisions.

Signed-off-by: Sandeep K Sinha <sandeepksinha@gmail.com>
Signed-off-by: NeilBrown <neilb@suse.de>

1 files changed, 0 insertions, 5 deletions

diff --git a/drivers/md/linear.h b/drivers/md/linear.h
index 76078f1cded..721a878403d 100644
--- a/drivers/md/linear.h
+++ b/drivers/md/linear.h
@@ -12,12 +12,7 @@ typedef struct dev_info dev_info_t;
 struct linear_private_data
 {
         struct linear_private_data *prev;       /* earlier version */
-        dev_info_t              **hash_table;
-        sector_t                spacing;
         sector_t                array_sectors;
-        int                     sector_shift;   /* shift before dividing
-                                                 * by spacing
-                                                 */
         dev_info_t              disks[0];
 };