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| author | Eric Blake <eblake@redhat.com> | 2016-11-17 14:13:54 -0600 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2016-11-22 23:26:51 +0100 |
| commit | 169407e1f7c9afee1cdac0ee6ad0b8d5e361c4dd (patch) | |
| tree | b8c0eff97a23f1f62682faad9ccaee32cf28f564 /hw/misc/hyperv_testdev.c | |
| parent | c2a85316902e67530da9d6548139fcce73c0cac6 (diff) | |
| download | focaccia-qemu-169407e1f7c9afee1cdac0ee6ad0b8d5e361c4dd.tar.gz focaccia-qemu-169407e1f7c9afee1cdac0ee6ad0b8d5e361c4dd.zip | |
nbd: Allow unmap and fua during write zeroes
Commit fa778fff wired up support to send the NBD_CMD_WRITE_ZEROES, but forgot to inform the block layer that FUA unmapping of zeroes is supported. Without BDRV_REQ_MAY_UNMAP listed as a supported flag, the block layer will always insist on the NBD layer passing NBD_CMD_FLAG_NO_HOLE, resulting in the server always allocating things even when it was desired to let the server punch holes. Similarly, failing to set BDRV_REQ_FUA means that the client may send unnecessary NBD_CMD_FLUSH when it could have instead used the NBD_CMD_FLAG_FUA bit. CC: qemu-stable@nongnu.org Signed-off-by: Eric Blake <eblake@redhat.com> Message-Id: <1479413642-22463-2-git-send-email-eblake@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'hw/misc/hyperv_testdev.c')
0 files changed, 0 insertions, 0 deletions