tree 64304edc8321e44ba9520304431e961ebf7fbdd7
parent 6460440f34c709461b84375cfd8a86b27d433225
author Kevin Wolf <kwolf@redhat.com> 1386084881 +0100
committer Kevin Wolf <kwolf@redhat.com> 1390581602 +0100

block: Align requests in bdrv_co_do_pwritev()

This patch changes bdrv_co_do_pwritev() to actually be what its name
promises. If requests aren't properly aligned, it performs a RMW.

Requests touching the same block are serialised against the RMW request.
Further optimisation of this is possible by differentiating types of
requests (concurrent reads should actually be okay here).

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>