[PATCH] Allocate hd_structs dynamically

From: Badari Pulavarty <pbadari@us.ibm.com>

Here is the patch to allocate hd_struct dynamically as we find
partitions.

There are 3 things I didn't like in the patch.

1) The patch allocates 15 pointers instead of 15 hd_structs.  (incase of
   s= csi).  I was really hoping to get rid of "15" and make it really
   dynamic.  (In ca= se if we ever want to support more than 15 partitions
   per disk etc..).=20 I was thought about making it a linked list, but
   blk_partition_remap() needs to get to hd_struct for a given partition
   everytime we do IO.  So linked list would be bad, we really need direct
   access to partition in= fo.

2) I had to add "partno" to hd_struct, since part_dev_read() used to calc=
   ulate partition number from the address before.

3) kmalloc() failure in add_partition() will be silently ignored.

It saves 2048 bytes per disk.

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