[dm-devel] Synchronizing writes between kernel space and user space.

[Abhishek Gupta]

Hi,

Can anyone tell me the synchronization calls to be used if writes 
to a device are being done from both user space and kernel space. I 
noticed that lock_page()/unlock_page() is one set of functions that 
can be used. Obviously, this is too coarse grained, if buffers are smaller 
than the page size. The functions lock_buffer()/unlock_buffer() do not 
seem to do the trick.

Please help.

Thanks

Abhishek