The DM_BUFIO_HASH_BITS is defined as 20, any plan to make it flexible?

[zhangxiao]

Hi Experts,

See drivers/md/dm-bufio.c as below:
  50 /*
  51  * Buffer hash
  52  */
  53 #define DM_BUFIO_HASH_BITS      20
  54 #define DM_BUFIO_HASH(block) \
  55         ((((block) >> DM_BUFIO_HASH_BITS) ^ (block)) & \
  56          ((1 << DM_BUFIO_HASH_BITS) - 1))
"drivers/md/dm-bufio.c" 1854L, 45375C

DM_BUFIO_HASH_BITS was defined as 20 and it maybe not fit for some
use case with limited resources. Do we have any plan to make it more
flexible? Like module parameter or something else?

Thanks
Xiao
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