tree 07d3de39e3839400dd903e53c3a86e5224c58def
parent 848c66e8f5b631961580f7f010a5831430dc84c2
author Paolo Bonzini <pbonzini@redhat.com> 1319109382 +0200
committer Kevin Wolf <kwolf@redhat.com> 1319211254 +0200

block: take lock around bdrv_read implementations

This does the first part of the conversion to coroutines, by
wrapping bdrv_read implementations to take the mutex.

Drivers that implement bdrv_read rather than bdrv_co_readv can
then benefit from asynchronous operation (at least if the underlying
protocol supports it, which is not the case for raw-win32), even
though they still operate with a bounce buffer.

raw-win32 does not need the lock, because it cannot yield.
nbd also doesn't probably, but better be safe.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>