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md: Removal of hash table in linear raid

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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>
This commit is contained in:
Sandeep K Sinha
2009-06-16 16:55:26 +10:00
committed by NeilBrown
parent 070ec55d07
commit 45d4582f21
2 changed files with 3 additions and 95 deletions
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5
drivers/md/linear.h
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@@ -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];
};