On 29.03.2016 15:30, Kevin Wolf wrote: > The NBD server already used to send a FUA flag when the writethrough > mode was set. This code was a remnant from the times where protocol > drivers actually had to implement writethrough modes. Since nowadays the > block layer sends flushes in writethrough mode and non-root nodes are > always writeback, this was mostly dead code - only mostly because if NBD > was configured to be used without a format, we sent _both_ FUA and an > explicit flush afterwards, which makes the code not technically dead, > but useless overhead. > > This patch changes the code so that the block layer's FUA flag is > recognised and translated into a NBD FUA flag. The additional flush is > avoided now. > > Signed-off-by: Kevin Wolf <kw...@redhat.com> > --- > block/nbd-client.c | 13 +++++++------ > block/nbd-client.h | 2 +- > block/nbd.c | 27 ++++++++++++++++++++++++++- > 3 files changed, 34 insertions(+), 8 deletions(-)
Reviewed-by: Max Reitz <mre...@redhat.com>
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