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Re: [dm-devel] [RFC][PATCH] Simplify dm_get_device restriction combining



Joe Thornber wrote:

On Tue, Jan 20, 2004 at 08:32:44PM +0100, Christophe Saout wrote:

To use blk_queue_stack_limits dm would have to associate a request queue
with a table and swap it around too. I don't know if this is possible.
dm doesn't use most of the fields in the request_queue struct.


This would be the wrong thing.

Right having the queue in the table would not work.


In the constructor the target calls dm_get_device on it's devices and combines the io restrictions for them. Then dm_table_add_target calls combine_restrictions_low to combine the newly added targets restrictions.

So, it looked like instead of combining the restrictions when you build the table you could defer it until you bind. dm_table_set_restrictions could just loop through its list of devices combining all the restrictions then.

Mike





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