[Xen-devel] xs transaction

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

Seems currently xenstore transaction provides confusing message 
in different places:

a) comment of xs_transaction_start says "You can only have one 
transaction at any time." However do_transaction_start allows up to 
10 transactions created, as long as all other existing transaction 
channel is idle at the time (conn->transaction == NULL)

b) when multiple transactions can be created, xenstore is not ready 
to handle traffic in parallel. Only one conn->transaction exists 

c) do_transaction_start says "/* We don't support nested transactions. 
*/" by checking conn->transaction, but it can't handle nest case. 
Conn->transaction only indicates whether traffic is on-going in other 
transaction, instead of whether other transactions are created. Instead 
conn->transaction_list should be checked for the purpose.

So what's expected usage for current xs transaction? Should xenstore 
add check on parallel/nest case, or depend on caller to avoid?

Thanks,
Kevin

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